principlesys8

MINIXSOURCECODEFile:include/ansi.
h501include/ansi.
h00000/*Theheaderattemptstodecidewhetherthecompilerhasenough00001*conformancetoStandardCforMinixtotakeadvantageof.
Ifso,the00002*symbol_ANSIisdefined(as31459).
Otherwise_ANSIisnotdefined00003*here,butitmaybedefinedbyapplicationsthatwanttobendtherules.
00004*Themagicnumberinthedefinitionistoinhibitunnecessarybending00005*oftherules.
(Forconsistencywiththenew'#ifdef_ANSI"testsin00006*theheaders,_ANSIshouldreallybedefinedasnothing,butthatwould00007*breakmanylibraryroutinesthatuse"#if_ANSI".
)0000800009*If_ANSIendsupbeingdefined,amacro00010*00011*_PROTOTYPE(function,params)00012*00013*isdefined.
Thismacroexpandsindifferentways,generatingeither00014*ANSIStandardCprototypesorold-styleK&R(Kernighan&Ritchie)00015*prototypes,asneeded.
Finally,someprogramsuse_CONST,_VOIDSTARetc00016*insuchawaythattheyareportableoverbothANSIandK&Rcompilers.
00017*Theappropriatemacrosaredefinedhere.
00018*/0001900020#ifndef_ANSI_H00021#define_ANSI_H0002200023#if__STDC__==100024#define_ANSI31459/*compilerclaimsfullANSIconformance*/00025#endif0002600027#ifdef__GNUC__00028#define_ANSI31459/*gccconformsenougheveninnon-ANSImode*/00029#endif0003000031#ifdef_ANSI0003200033/*KeepeverythingforANSIprototypes.
*/00034#define_PROTOTYPE(function,params)functionparams00035#define_ARGS(params)params0003600037#define_VOIDSTARvoid*00038#define_VOIDvoid00039#define_CONSTconst00040#define_VOLATILEvolatile00041#define_SIZETsize_t0004200043#else0004400045/*ThrowawaytheparametersforK&Rprototypes.
*/00046#define_PROTOTYPE(function,params)function()00047#define_ARGS(params)()0004800049#define_VOIDSTARvoid*00050#define_VOIDvoid00051#define_CONST00052#define_VOLATILE00053#define_SIZETint00054502File:include/ansi.
hMINIXSOURCECODE00055#endif/*_ANSI*/0005600057/*ThisshouldbedefinedasrestrictwhenaC99compilerisused.
*/00058#define_RESTRICT0005900060/*Settinganyof_MINIX,_POSIX_C_SOURCEor_POSIX2_SOURCEimplies00061*_POSIX_SOURCE.
(SeemswrongtoputthishereinANSIspace.
)00062*/00063#ifdefined(_MINIX)||_POSIX_C_SOURCE>0||defined(_POSIX2_SOURCE)00064#undef_POSIX_SOURCE00065#define_POSIX_SOURCE100066#endif0006700068#endif/*ANSI_H*/include/limits.
h00100/*Theheaderdefinessomebasicsizes,bothofthelanguagetypes00101*(e.
g.
,thenumberofbitsinaninteger),andoftheoperatingsystem(e.
g.
00102*thenumberofcharactersinafilename.
00103*/0010400105#ifndef_LIMITS_H00106#define_LIMITS_H0010700108/*Definitionsaboutchars(8bitsinMINIX,andsigned).
*/00109#defineCHAR_BIT8/*#bitsinachar*/00110#defineCHAR_MIN-128/*minimumvalueofachar*/00111#defineCHAR_MAX127/*maximumvalueofachar*/00112#defineSCHAR_MIN-128/*minimumvalueofasignedchar*/00113#defineSCHAR_MAX127/*maximumvalueofasignedchar*/00114#defineUCHAR_MAX255/*maximumvalueofanunsignedchar*/00115#defineMB_LEN_MAX1/*maximumlengthofamultibytechar*/0011600117/*Definitionsaboutshorts(16bitsinMINIX).
*/00118#defineSHRT_MIN(-32767-1)/*minimumvalueofashort*/00119#defineSHRT_MAX32767/*maximumvalueofashort*/00120#defineUSHRT_MAX0xFFFF/*maximumvalueofunsignedshort*/0012100122/*_EM_WSIZEisacompiler-generatedsymbolgivingthewordsizeinbytes.
*/00123#defineINT_MIN(-2147483647-1)/*minimumvalueofa32-bitint*/00124#defineINT_MAX2147483647/*maximumvalueofa32-bitint*/00125#defineUINT_MAX0xFFFFFFFF/*maximumvalueofanunsigned32-bitint*/0012600127/*Definitionsaboutlongs(32bitsinMINIX).
*/00128#defineLONG_MIN(-2147483647L-1)/*minimumvalueofalong*/00129#defineLONG_MAX2147483647L/*maximumvalueofalong*/00130#defineULONG_MAX0xFFFFFFFFL/*maximumvalueofanunsignedlong*/0013100132#include0013300134/*MinimumsizesrequiredbythePOSIXP1003.
1standard(Table2-3).
*/00135#ifdef_POSIX_SOURCE/*theseareonlyvisibleforPOSIX*/00136#define_POSIX_ARG_MAX4096/*exec()mayhave4Kworthofargs*/00137#define_POSIX_CHILD_MAX6/*aprocessmayhave6children*/00138#define_POSIX_LINK_MAX8/*afilemayhave8links*/00139#define_POSIX_MAX_CANON255/*sizeofthecanonicalinputqueue*/MINIXSOURCECODEFile:include/limits.
h50300140#define_POSIX_MAX_INPUT255/*youcantype255charsahead*/00141#define_POSIX_NAME_MAXDIRSIZ/*afilenamemayhave14chars*/00142#define_POSIX_NGROUPS_MAX0/*supplementarygroupIDsareoptional*/00143#define_POSIX_OPEN_MAX16/*aprocessmayhave16filesopen*/00144#define_POSIX_PATH_MAX255/*apathnamemaycontain255chars*/00145#define_POSIX_PIPE_BUF512/*pipeswritesof512bytesmustbeatomic*/00146#define_POSIX_STREAM_MAX8/*atleast8FILEscanbeopenatonce*/00147#define_POSIX_TZNAME_MAX3/*timezonenamescanbeatleast3chars*/00148#define_POSIX_SSIZE_MAX32767/*read()mustsupport32767bytereads*/0014900150/*ValuesactuallyimplementedbyMINIX(Tables2-4,2-5,2-6,and2-7).
*/00151/*SomeoftheseoldnameshadbetterbedefinedwhennotPOSIX.
*/00152#define_NO_LIMIT100/*arbitrarynumber;limitnotenforced*/0015300154#defineNGROUPS_MAX0/*supplementalgroupIDsnotavailable*/00155#defineARG_MAX16384/*#bytesofargs+environforexec()*/00156#defineCHILD_MAX_NO_LIMIT/*MINIXdoesnotlimitchildren*/00157#defineOPEN_MAX20/*#openfilesaprocessmayhave*/00158#defineLINK_MAXSHRT_MAX/*#linksafilemayhave*/00159#defineMAX_CANON255/*sizeofthecanonicalinputqueue*/00160#defineMAX_INPUT255/*sizeofthetype-aheadbuffer*/00161#defineNAME_MAXDIRSIZ/*#charsinafilename*/00162#definePATH_MAX255/*#charsinapathname*/00163#definePIPE_BUF7168/*#bytesinatomicwritetoapipe*/00164#defineSTREAM_MAX20/*mustbethesameasFOPEN_MAXinstdio.
h*/00165#defineTZNAME_MAX3/*maximumbytesinatimezonenameis3*/00166#defineSSIZE_MAX32767/*maxdefinedbytecountforread()*/0016700168#endif/*_POSIX_SOURCE*/0016900170#endif/*_LIMITS_H*/include/errno.
h00200/*Theheaderdefinesthenumbersofthevariouserrorsthatcan00201*occurduringprogramexecution.
Theyarevisibletouserprogramsand00202*shouldbesmallpositiveintegers.
However,theyarealsousedwithin00203*MINIX,wheretheymustbenegative.
Forexample,theREADsystemcallis00204*executedinternallybycallingdo_read().
Thisfunctionreturnseithera00205*(negative)errornumberora(positive)numberofbytesactuallyread.
00206*00207*Tosolvetheproblemofhavingtheerrornumbersbenegativeinsidethe00208*thesystemandpositiveoutside,thefollowingmechanismisused.
Allthe00209*definitionsarearetheform:00210*00211*#defineEPERM(_SIGN1)00212*00213*Ifthemacro_SYSTEMisdefined,then_SIGNissetto"-",otherwiseitis00214*setto"".
Thuswhencompilingtheoperatingsystem,themacro_SYSTEM00215*willbedefined,settingEPERMto(-1),whereaswhenwhenthis00216*fileisincludedinanordinaryuserprogram,EPERMhasthevalue(1).
00217*/0021800219#ifndef_ERRNO_H/*checkifisalreadyincluded*/504File:include/errno.
hMINIXSOURCECODE00220#define_ERRNO_H/*itisnotincluded;notethatfact*/0022100222/*Nowdefine_SIGNas""or"-"dependingon_SYSTEM.
*/00223#ifdef_SYSTEM00224#define_SIGN-00225#defineOK000226#else00227#define_SIGN00228#endif0022900230externinterrno;/*placewheretheerrornumbersgo*/0023100232/*Herearethenumericalvaluesoftheerrornumbers.
*/00233#define_NERROR70/*numberoferrors*/0023400235#defineEGENERIC(_SIGN99)/*genericerror*/00236#defineEPERM(_SIGN1)/*operationnotpermitted*/00237#defineENOENT(_SIGN2)/*nosuchfileordirectory*/00238#defineESRCH(_SIGN3)/*nosuchprocess*/00239#defineEINTR(_SIGN4)/*interruptedfunctioncall*/00240#defineEIO(_SIGN5)/*input/outputerror*/00241#defineENXIO(_SIGN6)/*nosuchdeviceoraddress*/00242#defineE2BIG(_SIGN7)/*arglisttoolong*/00243#defineENOEXEC(_SIGN8)/*execformaterror*/00244#defineEBADF(_SIGN9)/*badfiledescriptor*/00245#defineECHILD(_SIGN10)/*nochildprocess*/00246#defineEAGAIN(_SIGN11)/*resourcetemporarilyunavailable*/00247#defineENOMEM(_SIGN12)/*notenoughspace*/00248#defineEACCES(_SIGN13)/*permissiondenied*/00249#defineEFAULT(_SIGN14)/*badaddress*/00250#defineENOTBLK(_SIGN15)/*Extension:notablockspecialfile*/00251#defineEBUSY(_SIGN16)/*resourcebusy*/00252#defineEEXIST(_SIGN17)/*fileexists*/00253#defineEXDEV(_SIGN18)/*improperlink*/00254#defineENODEV(_SIGN19)/*nosuchdevice*/00255#defineENOTDIR(_SIGN20)/*notadirectory*/00256#defineEISDIR(_SIGN21)/*isadirectory*/00257#defineEINVAL(_SIGN22)/*invalidargument*/00258#defineENFILE(_SIGN23)/*toomanyopenfilesinsystem*/00259#defineEMFILE(_SIGN24)/*toomanyopenfiles*/00260#defineENOTTY(_SIGN25)/*inappropriateI/Ocontroloperation*/00261#defineETXTBSY(_SIGN26)/*nolongerused*/00262#defineEFBIG(_SIGN27)/*filetoolarge*/00263#defineENOSPC(_SIGN28)/*nospaceleftondevice*/00264#defineESPIPE(_SIGN29)/*invalidseek*/00265#defineEROFS(_SIGN30)/*read-onlyfilesystem*/00266#defineEMLINK(_SIGN31)/*toomanylinks*/00267#defineEPIPE(_SIGN32)/*brokenpipe*/00268#defineEDOM(_SIGN33)/*domainerror(fromANSICstd)*/00269#defineERANGE(_SIGN34)/*resulttoolarge(fromANSICstd)*/00270#defineEDEADLK(_SIGN35)/*resourcedeadlockavoided*/00271#defineENAMETOOLONG(_SIGN36)/*filenametoolong*/00272#defineENOLCK(_SIGN37)/*nolocksavailable*/00273#defineENOSYS(_SIGN38)/*functionnotimplemented*/00274#defineENOTEMPTY(_SIGN39)/*directorynotempty*/0027500276/*Thefollowingerrorsrelatetonetworking.
*/00277#defineEPACKSIZE(_SIGN50)/*invalidpacketsizeforsomeprotocol*/00278#defineEOUTOFBUFS(_SIGN51)/*notenoughbuffersleft*/00279#defineEBADIOCTL(_SIGN52)/*illegalioctlfordevice*/MINIXSOURCECODEFile:include/errno.
h50500280#defineEBADMODE(_SIGN53)/*badmodeinioctl*/00281#defineEWOULDBLOCK(_SIGN54)00282#defineEBADDEST(_SIGN55)/*notavaliddestinationaddress*/00283#defineEDSTNOTRCH(_SIGN56)/*destinationnotreachable*/00284#defineEISCONN(_SIGN57)/*allreadyconnected*/00285#defineEADDRINUSE(_SIGN58)/*addressinuse*/00286#defineECONNREFUSED(_SIGN59)/*connectionrefused*/00287#defineECONNRESET(_SIGN60)/*connectionreset*/00288#defineETIMEDOUT(_SIGN61)/*connectiontimedout*/00289#defineEURG(_SIGN62)/*urgentdatapresent*/00290#defineENOURG(_SIGN63)/*nourgentdatapresent*/00291#defineENOTCONN(_SIGN64)/*noconnection(yetoranymore)*/00292#defineESHUTDOWN(_SIGN65)/*awritecalltoashutdownconnection*/00293#defineENOCONN(_SIGN66)/*nosuchconnection*/00294#defineEAFNOSUPPORT(_SIGN67)/*addressfamilynotsupported*/00295#defineEPROTONOSUPPORT(_SIGN68)/*protocolnotsupportedbyAF*/00296#defineEPROTOTYPE(_SIGN69)/*Protocolwrongtypeforsocket*/00297#defineEINPROGRESS(_SIGN70)/*Operationnowinprogress*/00298#defineEADDRNOTAVAIL(_SIGN71)/*Can'tassignrequestedaddress*/00299#defineEALREADY(_SIGN72)/*Connectionalreadyinprogress*/00300#defineEMSGSIZE(_SIGN73)/*Messagetoolong*/0030100302/*ThefollowingarenotPOSIXerrors,buttheycanstillhappen.
00303*Allofthesearegeneratedbythekernelandrelatetomessagepassing.
00304*/00305#defineELOCKED(_SIGN101)/*can'tsendmessageduetodeadlock*/00306#defineEBADCALL(_SIGN102)/*illegalsystemcallnumber*/00307#defineEBADSRCDST(_SIGN103)/*badsourceordestinationprocess*/00308#defineECALLDENIED(_SIGN104)/*nopermissionforsystemcall*/00309#defineEDEADDST(_SIGN105)/*senddestinationisnotalive*/00310#defineENOTREADY(_SIGN106)/*sourceordestinationisnotready*/00311#defineEBADREQUEST(_SIGN107)/*destinationcannothandlerequest*/00312#defineEDONTREPLY(_SIGN201)/*pseudo-code:don'tsendareply*/0031300314#endif/*_ERRNO_H*/include/unistd.
h00400/*Theheadercontainsafewmiscellaneousmanifestconstants.
*/0040100402#ifndef_UNISTD_H00403#define_UNISTD_H0040400405#ifndef_TYPES_H00406#include00407#endif0040800409/*Valuesusedbyaccess().
POSIXTable2-8.
*/00410#defineF_OK0/*testiffileexists*/00411#defineX_OK1/*testiffileisexecutable*/00412#defineW_OK2/*testiffileiswritable*/00413#defineR_OK4/*testiffileisreadable*/0041400415/*Valuesusedforwhenceinlseek(fd,offset,whence).
POSIXTable2-9.
*/00416#defineSEEK_SET0/*offsetisabsolute*/00417#defineSEEK_CUR1/*offsetisrelativetocurrentposition*/00418#defineSEEK_END2/*offsetisrelativetoendoffile*/00419506File:include/unistd.
hMINIXSOURCECODE00420/*ThisvalueisrequiredbyPOSIXTable2-10.
*/00421#define_POSIX_VERSION199009L/*whichstandardisbeingconformedto*/0042200423/*ThesethreedefinitionsarerequiredbyPOSIXSec.
8.
2.
1.
2.
*/00424#defineSTDIN_FILENO0/*filedescriptorforstdin*/00425#defineSTDOUT_FILENO1/*filedescriptorforstdout*/00426#defineSTDERR_FILENO2/*filedescriptorforstderr*/0042700428#ifdef_MINIX00429/*Howtoexitthesystemorstopaserverprocess.
*/00430#defineRBT_HALT000431#defineRBT_REBOOT100432#defineRBT_PANIC2/*aserverpanics*/00433#defineRBT_MONITOR3/*letthemonitordothis*/00434#defineRBT_RESET4/*hardresetthesystem*/00435#endif0043600437/*Whatsysteminfotoretrievewithsysgetinfo().
*/00438#defineSI_KINFO0/*getkernelinfoviaPM*/00439#defineSI_PROC_ADDR1/*addressofprocesstable*/00440#defineSI_PROC_TAB2/*copyofentireprocesstable*/00441#defineSI_DMAP_TAB3/*getdevicedrivermappings*/0044200443/*NULLmustbedefinedinaccordingtoPOSIXSec.
2.
7.
1.
*/00444#defineNULL((void*)0)0044500446/*Thefollowingrelatetoconfigurablesystemvariables.
POSIXTable4-2.
*/00447#define_SC_ARG_MAX100448#define_SC_CHILD_MAX200449#define_SC_CLOCKS_PER_SEC300450#define_SC_CLK_TCK300451#define_SC_NGROUPS_MAX400452#define_SC_OPEN_MAX500453#define_SC_JOB_CONTROL600454#define_SC_SAVED_IDS700455#define_SC_VERSION800456#define_SC_STREAM_MAX900457#define_SC_TZNAME_MAX100045800459/*Thefollowingrelatetoconfigurablepathnamevariables.
POSIXTable5-2.
*/00460#define_PC_LINK_MAX1/*linkcount*/00461#define_PC_MAX_CANON2/*sizeofthecanonicalinputqueue*/00462#define_PC_MAX_INPUT3/*type-aheadbuffersize*/00463#define_PC_NAME_MAX4/*filenamesize*/00464#define_PC_PATH_MAX5/*pathnamesize*/00465#define_PC_PIPE_BUF6/*pipesize*/00466#define_PC_NO_TRUNC7/*treatmentoflongnamecomponents*/00467#define_PC_VDISABLE8/*ttydisable*/00468#define_PC_CHOWN_RESTRICTED9/*chownrestrictedornot*/0046900470/*POSIXdefinesseveraloptionsthatmaybeimplementedornot,atthe00471*implementer'swhim.
Thisimplementerhasmadethefollowingchoices:00472*00473*_POSIX_JOB_CONTROLnotdefined:nojobcontrol00474*_POSIX_SAVED_IDSnotdefined:nosaveduid/gid00475*_POSIX_NO_TRUNCdefinedas-1:longpathnamesaretruncated00476*_POSIX_CHOWN_RESTRICTEDdefined:youcan'tgiveawayfiles00477*_POSIX_VDISABLEdefined:ttyfunctionscanbedisabled00478*/00479#define_POSIX_NO_TRUNC(-1)MINIXSOURCECODEFile:include/unistd.
h50700480#define_POSIX_CHOWN_RESTRICTED10048100482/*FunctionPrototypes.
*/00483_PROTOTYPE(void_exit,(int_status));00484_PROTOTYPE(intaccess,(constchar*_path,int_amode));00485_PROTOTYPE(unsignedintalarm,(unsignedint_seconds));00486_PROTOTYPE(intchdir,(constchar*_path));00487_PROTOTYPE(intfchdir,(intfd));00488_PROTOTYPE(intchown,(constchar*_path,_mnx_Uid_t_owner,_mnx_Gid_t_group));00489_PROTOTYPE(intclose,(int_fd));00490_PROTOTYPE(char*ctermid,(char*_s));00491_PROTOTYPE(char*cuserid,(char*_s));00492_PROTOTYPE(intdup,(int_fd));00493_PROTOTYPE(intdup2,(int_fd,int_fd2));00494_PROTOTYPE(intexecl,(constchar*_path,constchar*_arg,00495_PROTOTYPE(intexecle,(constchar*_path,constchar*_arg,00496_PROTOTYPE(intexeclp,(constchar*_file,constchar*arg,00497_PROTOTYPE(intexecv,(constchar*_path,char*const_argv[]));00498_PROTOTYPE(intexecve,(constchar*_path,char*const_argv[],00499char*const_envp[]));00500_PROTOTYPE(intexecvp,(constchar*_file,char*const_argv[]));00501_PROTOTYPE(pid_tfork,(void));00502_PROTOTYPE(longfpathconf,(int_fd,int_name));00503_PROTOTYPE(char*getcwd,(char*_buf,size_t_size));00504_PROTOTYPE(gid_tgetegid,(void));00505_PROTOTYPE(uid_tgeteuid,(void));00506_PROTOTYPE(gid_tgetgid,(void));00507_PROTOTYPE(intgetgroups,(int_gidsetsize,gid_t_grouplist[]));00508_PROTOTYPE(char*getlogin,(void));00509_PROTOTYPE(pid_tgetpgrp,(void));00510_PROTOTYPE(pid_tgetpid,(void));00511_PROTOTYPE(pid_tgetppid,(void));00512_PROTOTYPE(uid_tgetuid,(void));00513_PROTOTYPE(intisatty,(int_fd));00514_PROTOTYPE(intlink,(constchar*_existing,constchar*_new));00515_PROTOTYPE(off_tlseek,(int_fd,off_t_offset,int_whence));00516_PROTOTYPE(longpathconf,(constchar*_path,int_name));00517_PROTOTYPE(intpause,(void));00518_PROTOTYPE(intpipe,(int_fildes[2]));00519_PROTOTYPE(ssize_tread,(int_fd,void*_buf,size_t_n));00520_PROTOTYPE(intrmdir,(constchar*_path));00521_PROTOTYPE(intsetgid,(_mnx_Gid_t_gid));00522_PROTOTYPE(intsetpgid,(pid_t_pid,pid_t_pgid));00523_PROTOTYPE(pid_tsetsid,(void));00524_PROTOTYPE(intsetuid,(_mnx_Uid_t_uid));00525_PROTOTYPE(unsignedintsleep,(unsignedint_seconds));00526_PROTOTYPE(longsysconf,(int_name));00527_PROTOTYPE(pid_ttcgetpgrp,(int_fd));00528_PROTOTYPE(inttcsetpgrp,(int_fd,pid_t_pgrp_id));00529_PROTOTYPE(char*ttyname,(int_fd));00530_PROTOTYPE(intunlink,(constchar*_path));00531_PROTOTYPE(ssize_twrite,(int_fd,constvoid*_buf,size_t_n));0053200533/*OpenGroupBaseSpecificationsIssue6(notcomplete)*/00534_PROTOTYPE(intsymlink,(constchar*path1,constchar*path2));00535_PROTOTYPE(intgetopt,(int_argc,char**_argv,char*_opts));00536externchar*optarg;00537externintoptind,opterr,optopt;00538_PROTOTYPE(intusleep,(useconds_t_useconds));00539508File:include/unistd.
hMINIXSOURCECODE00540#ifdef_MINIX00541#ifndef_TYPE_H00542#include00543#endif00544_PROTOTYPE(intbrk,(char*_addr));00545_PROTOTYPE(intchroot,(constchar*_name));00546_PROTOTYPE(intmknod,(constchar*_name,_mnx_Mode_t_mode,Dev_t_addr));00547_PROTOTYPE(intmknod4,(constchar*_name,_mnx_Mode_t_mode,Dev_t_addr,00548long_size));00549_PROTOTYPE(char*mktemp,(char*_template));00550_PROTOTYPE(intmount,(char*_spec,char*_name,int_flag));00551_PROTOTYPE(longptrace,(int_req,pid_t_pid,long_addr,long_data));00552_PROTOTYPE(char*sbrk,(int_incr));00553_PROTOTYPE(intsync,(void));00554_PROTOTYPE(intfsync,(intfd));00555_PROTOTYPE(intumount,(constchar*_name));00556_PROTOTYPE(intreboot,(int_how,00557_PROTOTYPE(intgethostname,(char*_hostname,size_t_len));00558_PROTOTYPE(intgetdomainname,(char*_domain,size_t_len));00559_PROTOTYPE(intttyslot,(void));00560_PROTOTYPE(intfttyslot,(int_fd));00561_PROTOTYPE(char*crypt,(constchar*_key,constchar*_salt));00562_PROTOTYPE(intgetsysinfo,(intwho,intwhat,void*where));00563_PROTOTYPE(intgetprocnr,(void));00564_PROTOTYPE(intfindproc,(char*proc_name,int*proc_nr));00565_PROTOTYPE(intallocmem,(phys_bytessize,phys_bytes*base));00566_PROTOTYPE(intfreemem,(phys_bytessize,phys_bytesbase));00567#defineDEV_MAP100568#defineDEV_UNMAP200569#definemapdriver(driver,device,style)devctl(DEV_MAP,driver,device,style)00570#defineunmapdriver(device)devctl(DEV_UNMAP,0,device,0)00571_PROTOTYPE(intdevctl,(intctl_req,intdriver,intdevice,intstyle));0057200573/*ForcompatibilitywithotherUnixsystems*/00574_PROTOTYPE(intgetpagesize,(void));00575_PROTOTYPE(intsetgroups,(intngroups,constgid_t*gidset));0057600577#endif0057800579_PROTOTYPE(intreadlink,(constchar*,char*,int));00580_PROTOTYPE(intgetopt,(int,char**,char*));00581externintoptind,opterr,optopt;0058200583#endif/*_UNISTD_H*/include/string.
h00600/*Theheadercontainsprototypesforthestringhandling00601*functions.
00602*/0060300604#ifndef_STRING_H00605#define_STRING_H0060600607#defineNULL((void*)0)0060800609#ifndef_SIZE_TMINIXSOURCECODEFile:include/string.
h50900610#define_SIZE_T00611typedefunsignedintsize_t;/*typereturnedbysizeof*/00612#endif/*_SIZE_T*/0061300614/*FunctionPrototypes.
*/00615#ifndef_ANSI_H00616#include00617#endif0061800619_PROTOTYPE(void*memchr,(constvoid*_s,int_c,size_t_n));00620_PROTOTYPE(intmemcmp,(constvoid*_s1,constvoid*_s2,size_t_n));00621_PROTOTYPE(void*memcpy,(void*_s1,constvoid*_s2,size_t_n));00622_PROTOTYPE(void*memmove,(void*_s1,constvoid*_s2,size_t_n));00623_PROTOTYPE(void*memset,(void*_s,int_c,size_t_n));00624_PROTOTYPE(char*strcat,(char*_s1,constchar*_s2));00625_PROTOTYPE(char*strchr,(constchar*_s,int_c));00626_PROTOTYPE(intstrncmp,(constchar*_s1,constchar*_s2,size_t_n));00627_PROTOTYPE(intstrcmp,(constchar*_s1,constchar*_s2));00628_PROTOTYPE(intstrcoll,(constchar*_s1,constchar*_s2));00629_PROTOTYPE(char*strcpy,(char*_s1,constchar*_s2));00630_PROTOTYPE(size_tstrcspn,(constchar*_s1,constchar*_s2));00631_PROTOTYPE(char*strerror,(int_errnum));00632_PROTOTYPE(size_tstrlen,(constchar*_s));00633_PROTOTYPE(char*strncat,(char*_s1,constchar*_s2,size_t_n));00634_PROTOTYPE(char*strncpy,(char*_s1,constchar*_s2,size_t_n));00635_PROTOTYPE(char*strpbrk,(constchar*_s1,constchar*_s2));00636_PROTOTYPE(char*strrchr,(constchar*_s,int_c));00637_PROTOTYPE(size_tstrspn,(constchar*_s1,constchar*_s2));00638_PROTOTYPE(char*strstr,(constchar*_s1,constchar*_s2));00639_PROTOTYPE(char*strtok,(char*_s1,constchar*_s2));00640_PROTOTYPE(size_tstrxfrm,(char*_s1,constchar*_s2,size_t_n));0064100642#ifdef_POSIX_SOURCE00643/*OpenGroupBaseSpecificationsIssue6(notcomplete)*/00644char*strdup(constchar*_s1);00645#endif0064600647#ifdef_MINIX00648/*Forbackwardcompatibility.
*/00649_PROTOTYPE(char*index,(constchar*_s,int_charwanted));00650_PROTOTYPE(char*rindex,(constchar*_s,int_charwanted));00651_PROTOTYPE(voidbcopy,(constvoid*_src,void*_dst,size_t_length));00652_PROTOTYPE(intbcmp,(constvoid*_s1,constvoid*_s2,size_t_length));00653_PROTOTYPE(voidbzero,(void*_dst,size_t_length));00654_PROTOTYPE(void*memccpy,(char*_dst,constchar*_src,int_ucharstop,00655size_t_size));0065600657/*Misc.
extrafunctions*/00658_PROTOTYPE(intstrcasecmp,(constchar*_s1,constchar*_s2));00659_PROTOTYPE(intstrncasecmp,(constchar*_s1,constchar*_s2,00660size_t_len));00661_PROTOTYPE(size_tstrnlen,(constchar*_s,size_t_n));00662#endif0066300664#endif/*_STRING_H*/510File:include/signal.
hMINIXSOURCECODEinclude/signal.
h00700/*TheheaderdefinesalltheANSIandPOSIXsignals.
00701*MINIXsupportsallthesignalsrequiredbyPOSIX.
Theyaredefinedbelow.
00702*Someadditionalsignalsarealsosupported.
00703*/0070400705#ifndef_SIGNAL_H00706#define_SIGNAL_H0070700708#ifndef_ANSI_H00709#include00710#endif00711#ifdef_POSIX_SOURCE00712#ifndef_TYPES_H00713#include00714#endif00715#endif0071600717/*Herearetypesthatarecloselyassociatedwithsignalhandling.
*/00718typedefintsig_atomic_t;0071900720#ifdef_POSIX_SOURCE00721#ifndef_SIGSET_T00722#define_SIGSET_T00723typedefunsignedlongsigset_t;00724#endif00725#endif0072600727#define_NSIG20/*numberofsignalsused*/0072800729#defineSIGHUP1/*hangup*/00730#defineSIGINT2/*interrupt(DEL)*/00731#defineSIGQUIT3/*quit(ASCIIFS)*/00732#defineSIGILL4/*illegalinstruction*/00733#defineSIGTRAP5/*tracetrap(notresetwhencaught)*/00734#defineSIGABRT6/*IOTinstruction*/00735#defineSIGIOT6/*SIGABRTforpeoplewhospeakPDP-11*/00736#defineSIGUNUSED7/*sparecode*/00737#defineSIGFPE8/*floatingpointexception*/00738#defineSIGKILL9/*kill(cannotbecaughtorignored)*/00739#defineSIGUSR110/*userdefinedsignal#1*/00740#defineSIGSEGV11/*segmentationviolation*/00741#defineSIGUSR212/*userdefinedsignal#2*/00742#defineSIGPIPE13/*writeonapipewithnoonetoreadit*/00743#defineSIGALRM14/*alarmclock*/00744#defineSIGTERM15/*softwareterminationsignalfromkill*/00745#defineSIGCHLD17/*childprocessterminatedorstopped*/0074600747#defineSIGEMT7/*obsolete*/00748#defineSIGBUS10/*obsolete*/0074900750/*MINIXspecificsignals.
Thesesignalsarenotusedbyuserproceses,00751*butmeanttoinformsystemprocesses,likethePM,aboutsystemevents.
00752*/00753#defineSIGKMESS18/*newkernelmessage*/00754#defineSIGKSIG19/*kernelsignalpending*/MINIXSOURCECODEFile:include/signal.
h51100755#defineSIGKSTOP20/*kernelshuttingdown*/0075600757/*POSIXrequiresthefollowingsignalstobedefined,eveniftheyare00758*notsupported.
Herearethedefinitions,buttheyarenotsupported.
00759*/00760#defineSIGCONT18/*continueifstopped*/00761#defineSIGSTOP19/*stopsignal*/00762#defineSIGTSTP20/*interactivestopsignal*/00763#defineSIGTTIN21/*backgroundprocesswantstoread*/00764#defineSIGTTOU22/*backgroundprocesswantstowrite*/0076500766/*Thesighandler_ttypeisnotallowedunless_POSIX_SOURCEisdefined.
*/00767typedefvoid_PROTOTYPE((*__sighandler_t),(int));0076800769/*Macrosusedasfunctionpointers.
*/00770#defineSIG_ERR((__sighandler_t)-1)/*errorreturn*/00771#defineSIG_DFL((__sighandler_t)0)/*defaultsignalhandling*/00772#defineSIG_IGN((__sighandler_t)1)/*ignoresignal*/00773#defineSIG_HOLD((__sighandler_t)2)/*blocksignal*/00774#defineSIG_CATCH((__sighandler_t)3)/*catchsignal*/00775#defineSIG_MESS((__sighandler_t)4)/*passasmessage(MINIX)*/0077600777#ifdef_POSIX_SOURCE00778structsigaction{00779__sighandler_tsa_handler;/*SIG_DFL,SIG_IGN,orpointertofunction*/00780sigset_tsa_mask;/*signalstobeblockedduringhandler*/00781intsa_flags;/*specialflags*/00782};0078300784/*Fieldsforsa_flags.
*/00785#defineSA_ONSTACK0x0001/*deliversignalonalternatestack*/00786#defineSA_RESETHAND0x0002/*resetsignalhandlerwhensignalcaught*/00787#defineSA_NODEFER0x0004/*don'tblocksignalwhilecatchingit*/00788#defineSA_RESTART0x0008/*automaticsystemcallrestart*/00789#defineSA_SIGINFO0x0010/*extendedsignalhandling*/00790#defineSA_NOCLDWAIT0x0020/*don'tcreatezombies*/00791#defineSA_NOCLDSTOP0x0040/*don'treceiveSIGCHLDwhenchildstops*/0079200793/*POSIXrequiresthesevaluesforusewithsigprocmask(2).
*/00794#defineSIG_BLOCK0/*forblockingsignals*/00795#defineSIG_UNBLOCK1/*forunblockingsignals*/00796#defineSIG_SETMASK2/*forsettingthesignalmask*/00797#defineSIG_INQUIRE4/*forinternaluseonly*/00798#endif/*_POSIX_SOURCE*/0079900800/*POSIXandANSIfunctionprototypes.
*/00801_PROTOTYPE(intraise,(int_sig));00802_PROTOTYPE(__sighandler_tsignal,(int_sig,__sighandler_t_func));0080300804#ifdef_POSIX_SOURCE00805_PROTOTYPE(intkill,(pid_t_pid,int_sig));00806_PROTOTYPE(intsigaction,00807(int_sig,conststructsigaction*_act,structsigaction*_oact));00808_PROTOTYPE(intsigaddset,(sigset_t*_set,int_sig));00809_PROTOTYPE(intsigdelset,(sigset_t*_set,int_sig));00810_PROTOTYPE(intsigemptyset,(sigset_t*_set));00811_PROTOTYPE(intsigfillset,(sigset_t*_set));00812_PROTOTYPE(intsigismember,(constsigset_t*_set,int_sig));00813_PROTOTYPE(intsigpending,(sigset_t*_set));00814_PROTOTYPE(intsigprocmask,512File:include/signal.
hMINIXSOURCECODE00815(int_how,constsigset_t*_set,sigset_t*_oset));00816_PROTOTYPE(intsigsuspend,(constsigset_t*_sigmask));00817#endif0081800819#endif/*_SIGNAL_H*/include/fcntl.
h00900/*Theheaderisneededbytheopen()andfcntl()systemcalls,00901*whichhaveavarietyofparametersandflags.
Theyaredescribedhere.
00902*Theformatsofthecallstoeachoftheseare:00903*00904*open(path,oflag[,mode])openafile00905*fcntl(fd,cmd[,arg])getorsetfileattributes00906*00907*/0090800909#ifndef_FCNTL_H00910#define_FCNTL_H0091100912#ifndef_TYPES_H00913#include00914#endif0091500916/*Thesevaluesareusedforcmdinfcntl().
POSIXTable6-1.
*/00917#defineF_DUPFD0/*duplicatefiledescriptor*/00918#defineF_GETFD1/*getfiledescriptorflags*/00919#defineF_SETFD2/*setfiledescriptorflags*/00920#defineF_GETFL3/*getfilestatusflags*/00921#defineF_SETFL4/*setfilestatusflags*/00922#defineF_GETLK5/*getrecordlockinginformation*/00923#defineF_SETLK6/*setrecordlockinginformation*/00924#defineF_SETLKW7/*setrecordlockinginfo;waitifblocked*/0092500926/*Filedescriptorflagsusedforfcntl().
POSIXTable6-2.
*/00927#defineFD_CLOEXEC1/*closeonexecflagforthirdargoffcntl*/0092800929/*L_typevaluesforrecordlockingwithfcntl().
POSIXTable6-3.
*/00930#defineF_RDLCK1/*sharedorreadlock*/00931#defineF_WRLCK2/*exclusiveorwritelock*/00932#defineF_UNLCK3/*unlock*/0093300934/*Oflagvaluesforopen().
POSIXTable6-4.
*/00935#defineO_CREAT00100/*creatfileifitdoesn'texist*/00936#defineO_EXCL00200/*exclusiveuseflag*/00937#defineO_NOCTTY00400/*donotassignacontrollingterminal*/00938#defineO_TRUNC01000/*truncateflag*/0093900940/*Filestatusflagsforopen()andfcntl().
POSIXTable6-5.
*/00941#defineO_APPEND02000/*setappendmode*/00942#defineO_NONBLOCK04000/*nodelay*/0094300944/*Fileaccessmodesforopen()andfcntl().
POSIXTable6-6.
*/00945#defineO_RDONLY0/*open(name,O_RDONLY)opensreadonly*/00946#defineO_WRONLY1/*open(name,O_WRONLY)openswriteonly*/00947#defineO_RDWR2/*open(name,O_RDWR)opensread/write*/0094800949/*Maskforusewithfileaccessmodes.
POSIXTable6-7.
*/MINIXSOURCECODEFile:include/fcntl.
h51300950#defineO_ACCMODE03/*maskforfileaccessmodes*/0095100952/*Structusedforlocking.
POSIXTable6-8.
*/00953structflock{00954shortl_type;/*type:F_RDLCK,F_WRLCK,orF_UNLCK*/00955shortl_whence;/*flagforstartingoffset*/00956off_tl_start;/*relativeoffsetinbytes*/00957off_tl_len;/*size;if0,thenuntilEOF*/00958pid_tl_pid;/*processidofthelocks'owner*/00959};0096000961/*FunctionPrototypes.
*/00962_PROTOTYPE(intcreat,(constchar*_path,_mnx_Mode_t_mode));00963_PROTOTYPE(intfcntl,(int_filedes,int_cmd,00964_PROTOTYPE(intopen,(constchar*_path,int_oflag,0096500966#endif/*_FCNTL_H*/include/termios.
h01000/*Theheaderisusedforcontrollingttymodes.
*/0100101002#ifndef_TERMIOS_H01003#define_TERMIOS_H0100401005typedefunsignedshorttcflag_t;01006typedefunsignedcharcc_t;01007typedefunsignedintspeed_t;0100801009#defineNCCS20/*sizeofcc_carray,someextraspace01010*forextensions.
*/0101101012/*Primaryterminalcontrolstructure.
POSIXTable7-1.
*/01013structtermios{01014tcflag_tc_iflag;/*inputmodes*/01015tcflag_tc_oflag;/*outputmodes*/01016tcflag_tc_cflag;/*controlmodes*/01017tcflag_tc_lflag;/*localmodes*/01018speed_tc_ispeed;/*inputspeed*/01019speed_tc_ospeed;/*outputspeed*/01020cc_tc_cc[NCCS];/*controlcharacters*/01021};0102201023/*Valuesfortermiosc_iflagbitmap.
POSIXTable7-2.
*/01024#defineBRKINT0x0001/*signalinterruptonbreak*/01025#defineICRNL0x0002/*mapCRtoNLoninput*/01026#defineIGNBRK0x0004/*ignorebreak*/01027#defineIGNCR0x0008/*ignoreCR*/01028#defineIGNPAR0x0010/*ignorecharacterswithparityerrors*/01029#defineINLCR0x0020/*mapNLtoCRoninput*/01030#defineINPCK0x0040/*enableinputparitycheck*/01031#defineISTRIP0x0080/*maskoff8thbit*/01032#defineIXOFF0x0100/*enablestart/stopinputcontrol*/01033#defineIXON0x0200/*enablestart/stopoutputcontrol*/01034#definePARMRK0x0400/*markparityerrorsintheinputqueue*/514File:include/termios.
hMINIXSOURCECODE0103501036/*Valuesfortermiosc_oflagbitmap.
POSIXSec.
7.
1.
2.
3.
*/01037#defineOPOST0x0001/*performoutputprocessing*/0103801039/*Valuesfortermiosc_cflagbitmap.
POSIXTable7-3.
*/01040#defineCLOCAL0x0001/*ignoremodemstatuslines*/01041#defineCREAD0x0002/*enablereceiver*/01042#defineCSIZE0x000C/*numberofbitspercharacter*/01043#defineCS50x0000/*ifCSIZEisCS5,charactersare5bits*/01044#defineCS60x0004/*ifCSIZEisCS6,charactersare6bits*/01045#defineCS70x0008/*ifCSIZEisCS7,charactersare7bits*/01046#defineCS80x000C/*ifCSIZEisCS8,charactersare8bits*/01047#defineCSTOPB0x0010/*send2stopbitsifset,else1*/01048#defineHUPCL0x0020/*hanguponlastclose*/01049#definePARENB0x0040/*enableparityonoutput*/01050#definePARODD0x0080/*useoddparityifset,elseeven*/0105101052/*Valuesfortermiosc_lflagbitmap.
POSIXTable7-4.
*/01053#defineECHO0x0001/*enableechoingofinputcharacters*/01054#defineECHOE0x0002/*echoERASEasbackspace*/01055#defineECHOK0x0004/*echoKILL*/01056#defineECHONL0x0008/*echoNL*/01057#defineICANON0x0010/*canonicalinput(eraseandkillenabled)*/01058#defineIEXTEN0x0020/*enableextendedfunctions*/01059#defineISIG0x0040/*enablesignals*/01060#defineNOFLSH0x0080/*disableflushafterinterruptorquit*/01061#defineTOSTOP0x0100/*sendSIGTTOU(jobcontrol,notimplemented*/0106201063/*Indicesintoc_ccarray.
Defaultvaluesinparentheses.
POSIXTable7-5.
*/01064#defineVEOF0/*cc_c[VEOF]=EOFchar(D)*/01065#defineVEOL1/*cc_c[VEOL]=EOLchar(undef)*/01066#defineVERASE2/*cc_c[VERASE]=ERASEchar(H)*/01067#defineVINTR3/*cc_c[VINTR]=INTRchar(DEL)*/01068#defineVKILL4/*cc_c[VKILL]=KILLchar(U)*/01069#defineVMIN5/*cc_c[VMIN]=MINvaluefortimer*/01070#defineVQUIT6/*cc_c[VQUIT]=QUITchar(\)*/01071#defineVTIME7/*cc_c[VTIME]=TIMEvaluefortimer*/01072#defineVSUSP8/*cc_c[VSUSP]=SUSP(Z,ignored)*/01073#defineVSTART9/*cc_c[VSTART]=STARTchar(S)*/01074#defineVSTOP10/*cc_c[VSTOP]=STOPchar(Q)*/0107501076#define_POSIX_VDISABLE(cc_t)0xFF/*Youcan'tevengeneratethis01077*characterwith'normal'keyboards.
01078*Butsomelanguagespecifickeyboards01079*cangenerate0xFF.
Itseemsthatall01080*256areused,socc_tshouldbea01081*short.
.
.
01082*/0108301084/*Valuesforthebaudratesettings.
POSIXTable7-6.
*/01085#defineB00x0000/*hanguptheline*/01086#defineB500x1000/*50baud*/01087#defineB750x2000/*75baud*/01088#defineB1100x3000/*110baud*/01089#defineB1340x4000/*134.
5baud*/01090#defineB1500x5000/*150baud*/01091#defineB2000x6000/*200baud*/01092#defineB3000x7000/*300baud*/01093#defineB6000x8000/*600baud*/01094#defineB12000x9000/*1200baud*/MINIXSOURCECODEFile:include/termios.
h51501095#defineB18000xA000/*1800baud*/01096#defineB24000xB000/*2400baud*/01097#defineB48000xC000/*4800baud*/01098#defineB96000xD000/*9600baud*/01099#defineB192000xE000/*19200baud*/01100#defineB384000xF000/*38400baud*/0110101102/*Optionalactionsfortcsetattr().
POSIXSec.
7.
2.
1.
2.
*/01103#defineTCSANOW1/*changestakeeffectimmediately*/01104#defineTCSADRAIN2/*changestakeeffectafteroutputisdone*/01105#defineTCSAFLUSH3/*waitforoutputtofinishandflushinput*/0110601107/*Queue_selectorvaluesfortcflush().
POSIXSec.
7.
2.
2.
2.
*/01108#defineTCIFLUSH1/*flushaccumulatedinputdata*/01109#defineTCOFLUSH2/*flushaccumulatedoutputdata*/01110#defineTCIOFLUSH3/*flushaccumulatedinputandoutputdata*/0111101112/*Actionvaluesfortcflow().
POSIXSec.
7.
2.
2.
2.
*/01113#defineTCOOFF1/*suspendoutput*/01114#defineTCOON2/*restartsuspendedoutput*/01115#defineTCIOFF3/*transmitaSTOPcharacterontheline*/01116#defineTCION4/*transmitaSTARTcharacterontheline*/0111701118/*FunctionPrototypes.
*/01119#ifndef_ANSI_H01120#include01121#endif0112201123_PROTOTYPE(inttcsendbreak,(int_fildes,int_duration));01124_PROTOTYPE(inttcdrain,(int_filedes));01125_PROTOTYPE(inttcflush,(int_filedes,int_queue_selector));01126_PROTOTYPE(inttcflow,(int_filedes,int_action));01127_PROTOTYPE(speed_tcfgetispeed,(conststructtermios*_termios_p));01128_PROTOTYPE(speed_tcfgetospeed,(conststructtermios*_termios_p));01129_PROTOTYPE(intcfsetispeed,(structtermios*_termios_p,speed_t_speed));01130_PROTOTYPE(intcfsetospeed,(structtermios*_termios_p,speed_t_speed));01131_PROTOTYPE(inttcgetattr,(int_filedes,structtermios*_termios_p));01132_PROTOTYPE(inttcsetattr,\01133(int_filedes,int_opt_actions,conststructtermios*_termios_p));0113401135#definecfgetispeed(termios_p)((termios_p)->c_ispeed)01136#definecfgetospeed(termios_p)((termios_p)->c_ospeed)01137#definecfsetispeed(termios_p,speed)((termios_p)->c_ispeed=(speed),0)01138#definecfsetospeed(termios_p,speed)((termios_p)->c_ospeed=(speed),0)0113901140#ifdef_MINIX01141/*HerearethelocalextensionstothePOSIXstandardforMinix.
Posix01142*conformingprogramsarenotabletoaccessthese,andthereforetheyare01143*onlydefinedwhenaMinixprogramiscompiled.
01144*/0114501146/*Extensionstothetermiosc_iflagbitmap.
*/01147#defineIXANY0x0800/*allowanykeytocontinueouptut*/0114801149/*Extensionstothetermiosc_oflagbitmap.
Theyareonlyactiveiff01150*OPOSTisenabled.
*/01151#defineONLCR0x0002/*MapNLtoCR-NLonoutput*/01152#defineXTABS0x0004/*Expandtabstospaces*/01153#defineONOEOT0x0008/*discardEOT's(D)onoutput)*/01154516File:include/termios.
hMINIXSOURCECODE01155/*Extensionstothetermiosc_lflagbitmap.
*/01156#defineLFLUSHO0x0200/*Flushoutput.
*/0115701158/*Extensionstothec_ccarray.
*/01159#defineVREPRINT11/*cc_c[VREPRINT](R)*/01160#defineVLNEXT12/*cc_c[VLNEXT](V)*/01161#defineVDISCARD13/*cc_c[VDISCARD](O)*/0116201163/*Extensionstobaudratesettings.
*/01164#defineB576000x0100/*57600baud*/01165#defineB1152000x0200/*115200baud*/0116601167/*Thesearethedefaultsettingsusedbythekernelandby'sttysane'*/0116801169#defineTCTRL_DEF(CREAD|CS8|HUPCL)01170#defineTINPUT_DEF(BRKINT|ICRNL|IXON|IXANY)01171#defineTOUTPUT_DEF(OPOST|ONLCR)01172#defineTLOCAL_DEF(ISIG|IEXTEN|ICANON|ECHO|ECHOE)01173#defineTSPEED_DEFB96000117401175#defineTEOF_DEF'\4'/*D*/01176#defineTEOL_DEF_POSIX_VDISABLE01177#defineTERASE_DEF'\10'/*H*/01178#defineTINTR_DEF'\3'/*C*/01179#defineTKILL_DEF'\25'/*U*/01180#defineTMIN_DEF101181#defineTQUIT_DEF'\34'01182#defineTSTART_DEF'\21'/*Q*/01183#defineTSTOP_DEF'\23'/*S*/01184#defineTSUSP_DEF'\32'/*Z*/01185#defineTTIME_DEF001186#defineTREPRINT_DEF'\22'/*R*/01187#defineTLNEXT_DEF'\26'/*V*/01188#defineTDISCARD_DEF'\17'/*O*/0118901190/*Windowsize.
ThisinformationisstoredintheTTYdriverbutnotused.
01191*Thiscanbeusedforscreenbasedapplicationsinawindowenvironment.
01192*TheioctlsTIOCGWINSZandTIOCSWINSZcanbeusedtogetandsetthis01193*information.
01194*/0119501196structwinsize01197{01198unsignedshortws_row;/*rows,incharacters*/01199unsignedshortws_col;/*columns,incharacters*/01200unsignedshortws_xpixel;/*horizontalsize,pixels*/01201unsignedshortws_ypixel;/*verticalsize,pixels*/01202};01203#endif/*_MINIX*/0120401205#endif/*_TERMIOS_H*/MINIXSOURCECODEFile:include/timers.
h517include/timers.
h01300/*Thislibraryprovidesgenericwatchdogtimermanagementfunctionality.
01301*Thefunctionsoperateonatimerqueueprovidedbythecaller.
Notethat01302*thetimersmustuseabsolutetimetoallowsorting.
Thelibraryprovides:01303*01304*tmrs_settimer:(re)setanewwatchdogtimerinthetimersqueue01305*tmrs_clrtimer:removeatimerfromboththetimersqueue01306*tmrs_exptimers:checkforexpiredtimersandrunwatchdogfunctions01307*01308*Author:01309*JorritN.
Herder01310*Adaptedfromtmr_settimerandtmr_clrtimerinsrc/kernel/clock.
c.
01311*Lastmodified:September30,2004.
01312*/0131301314#ifndef_TIMERS_H01315#define_TIMERS_H0131601317#include01318#include0131901320structtimer;01321typedefvoid(*tmr_func_t)(structtimer*tp);01322typedefunion{intta_int;longta_long;void*ta_ptr;}tmr_arg_t;0132301324/*Atimer_tvariablemustbedeclareforeachdistincttimertobeused.
01325*Thetimerswatchdogfunctionandexpirationtimeareautomaticallyset01326*bythelibraryfunctiontmrs_settimer,butitsargumentisnot.
01327*/01328typedefstructtimer01329{01330structtimer*tmr_next;/*nextinatimerchain*/01331clock_ttmr_exp_time;/*expirationtime*/01332tmr_func_ttmr_func;/*functiontocallwhenexpired*/01333tmr_arg_ttmr_arg;/*randomargument*/01334}timer_t;0133501336/*Usedwhenthetimerisnotactive.
*/01337#defineTMR_NEVER((clock_t)-1tmr_arg)01343#definetmr_exp_time(tp)(&(tp)->tmr_exp_time)0134401345/*Timersshouldbeinitializedoncebeforetheyarebeingused.
Becareful01346*nottoreinitializeatimerthatisinalistoftimers,orthechain01347*willbebroken.
01348*/01349#definetmr_inittimer(tp)(void)((tp)->tmr_exp_time=TMR_NEVER,\01350(tp)->tmr_next=NULL)0135101352/*Thefollowinggenerictimermanagementfunctionsareavailable.
They01353*canbeusedtooperateonthelistsoftimers.
Addingatimertoalist01354*automaticallytakescareofremovingit.
518File:include/timers.
hMINIXSOURCECODE01355*/01356_PROTOTYPE(clock_ttmrs_clrtimer,(timer_t**tmrs,timer_t*tp,clock_t*new_head));01357_PROTOTYPE(voidtmrs_exptimers,(timer_t**tmrs,clock_tnow,clock_t*new_head));01358_PROTOTYPE(clock_ttmrs_settimer,(timer_t**tmrs,timer_t*tp,01359clock_texp_time,tmr_func_twatchdog,clock_t*new_head));0136001361#endif/*_TIMERS_H*/01362include/sys/types.
h01400/*Theheadercontainsimportantdatatypedefinitions.
01401*Itisconsideredgoodprogrammingpracticetousethesedefinitions,01402*insteadoftheunderlyingbasetype.
Byconvention,alltypenamesend01403*with_t.
01404*/0140501406#ifndef_TYPES_H01407#define_TYPES_H0140801409#ifndef_ANSI_H01410#include01411#endif0141201413/*Thetypesize_tholdsallresultsofthesizeofoperator.
Atfirstglance,01414*itseemsobviousthatitshouldbeanunsignedint,butthisisnotalways01415*thecase.
Forexample,MINIX-ST(68000)has32-bitpointersand16-bit01416*integers.
Whenoneasksforthesizeofa70Kstructorarray,theresult01417*requires17bitstoexpress,sosize_tmustbealongtype.
Thetype01418*ssize_tisthesignedversionofsize_t.
01419*/01420#ifndef_SIZE_T01421#define_SIZE_T01422typedefunsignedintsize_t;01423#endif0142401425#ifndef_SSIZE_T01426#define_SSIZE_T01427typedefintssize_t;01428#endif0142901430#ifndef_TIME_T01431#define_TIME_T01432typedeflongtime_t;/*timeinsecsince1Jan19700000GMT*/01433#endif0143401435#ifndef_CLOCK_T01436#define_CLOCK_T01437typedeflongclock_t;/*unitforsystemaccounting*/01438#endif0143901440#ifndef_SIGSET_T01441#define_SIGSET_T01442typedefunsignedlongsigset_t;01443#endif01444MINIXSOURCECODEFile:include/sys/types.
h51901445/*OpenGroupBaseSpecificationsIssue6(notcomplete)*/01446typedeflonguseconds_t;/*Timeinmicroseconds*/0144701448/*Typesusedindisk,inode,etc.
datastructures.
*/01449typedefshortdev_t;/*holds(major|minor)devicepair*/01450typedefchargid_t;/*groupid*/01451typedefunsignedlongino_t;/*i-nodenumber(V3filesystem)*/01452typedefunsignedshortmode_t;/*filetypeandpermissionsbits*/01453typedefshortnlink_t;/*numberoflinkstoafile*/01454typedefunsignedlongoff_t;/*offsetwithinafile*/01455typedefintpid_t;/*processid(mustbesigned)*/01456typedefshortuid_t;/*userid*/01457typedefunsignedlongzone_t;/*zonenumber*/01458typedefunsignedlongblock_t;/*blocknumber*/01459typedefunsignedlongbit_t;/*bitnumberinabitmap*/01460typedefunsignedshortzone1_t;/*zonenumberforV1filesystems*/01461typedefunsignedshortbitchunk_t;/*collectionofbitsinabitmap*/0146201463typedefunsignedcharu8_t;/*8bittype*/01464typedefunsignedshortu16_t;/*16bittype*/01465typedefunsignedlongu32_t;/*32bittype*/0146601467typedefchari8_t;/*8bitsignedtype*/01468typedefshorti16_t;/*16bitsignedtype*/01469typedeflongi32_t;/*32bitsignedtype*/0147001471typedefstruct{u32_t_[2];}u64_t;0147201473/*ThefollowingtypesareneededbecauseMINIXusesK&Rstylefunction01474*definitions(formaximumportability).
Whenashort,suchasdev_t,is01475*passedtoafunctionwithaK&Rdefinition,thecompilerautomatically01476*promotesittoanint.
Theprototypemustcontainanintastheparameter,01477*notashort,becauseanintiswhatanold-stylefunctiondefinition01478*expects.
Thususingdev_tinaprototypewouldbeincorrect.
Itwouldbe01479*sufficienttojustuseintinsteadofdev_tintheprototypes,butDev_t01480*isclearer.
01481*/01482typedefintDev_t;01483typedefint_mnx_Gid_t;01484typedefintNlink_t;01485typedefint_mnx_Uid_t;01486typedefintU8_t;01487typedefunsignedlongU32_t;01488typedefintI8_t;01489typedefintI16_t;01490typedeflongI32_t;0149101492/*ANSICmakeswritingdownthepromotionofunsignedtypesverymessy.
When01493*sizeof(short)==sizeof(int),thereisnopromotion,sothetypestays01494*unsigned.
WhenthecompilerisnotANSI,thereisusuallynolossof01495*unsignedness,andthereareusuallynoprototypessothepromotedtype01496*doesn'tmatter.
TheuseoftypeslikeIno_tisanattempttouseints01497*(whicharenotpromoted)whileprovidinginformationtothereader.
01498*/0149901500typedefunsignedlongIno_t;0150101502#if_EM_WSIZE==201503/*typedefunsignedintIno_t;Ino_tisnow32bits*/01504typedefunsignedintZone1_t;520File:include/sys/types.
hMINIXSOURCECODE01505typedefunsignedintBitchunk_t;01506typedefunsignedintU16_t;01507typedefunsignedint_mnx_Mode_t;0150801509#else/*_EM_WSIZE==4,or_EM_WSIZEundefined*/01510/*typedefintIno_t;Ino_tisnow32bits*/01511typedefintZone1_t;01512typedefintBitchunk_t;01513typedefintU16_t;01514typedefint_mnx_Mode_t;0151501516#endif/*_EM_WSIZE==2,etc*/0151701518/*Signalhandlertype,e.
g.
SIG_IGN*/01519typedefvoid_PROTOTYPE((*sighandler_t),(int));0152001521/*Compatibilitywithothersystems*/01522typedefunsignedcharu_char;01523typedefunsignedshortu_short;01524typedefunsignedintu_int;01525typedefunsignedlongu_long;01526typedefchar*caddr_t;0152701528#endif/*_TYPES_H*/include/sys/sigcontext.
h01600#ifndef_SIGCONTEXT_H01601#define_SIGCONTEXT_H0160201603/*Thesigcontextstructureisusedbythesigreturn(2)systemcall.
01604*sigreturn()isseldomcalledbyuserprograms,butitisusedinternally01605*bythesignalcatchingmechanism.
01606*/0160701608#ifndef_ANSI_H01609#include01610#endif0161101612#ifndef_MINIX_SYS_CONFIG_H01613#include01614#endif0161501616#if!
defined(_MINIX_CHIP)01617#include"error,configurationisnotknown"01618#endif0161901620/*Thefollowingstructureshouldmatchthestackframe_sstructureused01621*bythekernel'scontextswitchingcode.
Floatingpointregistersshould01622*beaddedinadifferentstruct.
01623*/01624structsigregs{01625shortsr_gs;01626shortsr_fs;01627shortsr_es;01628shortsr_ds;01629intsr_di;MINIXSOURCECODEFile:include/sys/sigcontext.
h52101630intsr_si;01631intsr_bp;01632intsr_st;/*stacktop--usedinkernel*/01633intsr_bx;01634intsr_dx;01635intsr_cx;01636intsr_retreg;01637intsr_retadr;/*returnaddresstocallerofsave--used01638*inkernel*/01639intsr_pc;01640intsr_cs;01641intsr_psw;01642intsr_sp;01643intsr_ss;01644};0164501646structsigframe{/*stackframecreatedforsignalledprocess*/01647_PROTOTYPE(void(*sf_retadr),(void));01648intsf_signo;01649intsf_code;01650structsigcontext*sf_scp;01651intsf_fp;01652_PROTOTYPE(void(*sf_retadr2),(void));01653structsigcontext*sf_scpcopy;01654};0165501656structsigcontext{01657intsc_flags;/*sigstackstatetorestore*/01658longsc_mask;/*signalmasktorestore*/01659structsigregssc_regs;/*registersettorestore*/01660};0166101662#definesc_gssc_regs.
sr_gs01663#definesc_fssc_regs.
sr_fs01664#definesc_essc_regs.
sr_es01665#definesc_dssc_regs.
sr_ds01666#definesc_disc_regs.
sr_di01667#definesc_sisc_regs.
sr_si01668#definesc_fpsc_regs.
sr_bp01669#definesc_stsc_regs.
sr_st/*stacktop--usedinkernel*/01670#definesc_bxsc_regs.
sr_bx01671#definesc_dxsc_regs.
sr_dx01672#definesc_cxsc_regs.
sr_cx01673#definesc_retregsc_regs.
sr_retreg01674#definesc_retadrsc_regs.
sr_retadr/*returnaddresstocallerof01675save--usedinkernel*/01676#definesc_pcsc_regs.
sr_pc01677#definesc_cssc_regs.
sr_cs01678#definesc_pswsc_regs.
sr_psw01679#definesc_spsc_regs.
sr_sp01680#definesc_sssc_regs.
sr_ss0168101682/*Valuesforsc_flags.
Mustagreewith.
*/01683#defineSC_SIGCONTEXT2/*nonzerowhensignalcontextisincluded*/01684#defineSC_NOREGLOCALS4/*nonzerowhenregistersarenottobe01685savedandrestored*/0168601687_PROTOTYPE(intsigreturn,(structsigcontext*_scp));0168801689#endif/*_SIGCONTEXT_H*/522File:include/sys/stat.
hMINIXSOURCECODEinclude/sys/stat.
h01700/*Theheaderdefinesastructthatisusedinthestat()and01701*fstatfunctions.
Theinformationinthisstructcomesfromthei-nodeof01702*somefile.
Thesecallsaretheonlyapprovedwaytoinspecti-nodes.
01703*/0170401705#ifndef_STAT_H01706#define_STAT_H0170701708#ifndef_TYPES_H01709#include01710#endif0171101712structstat{01713dev_tst_dev;/*major/minordevicenumber*/01714ino_tst_ino;/*i-nodenumber*/01715mode_tst_mode;/*filemode,protectionbits,etc.
*/01716shortintst_nlink;/*#links;TEMPORARYHACK:shouldbenlink_t*/01717uid_tst_uid;/*uidofthefile'sowner*/01718shortintst_gid;/*gid;TEMPORARYHACK:shouldbegid_t*/01719dev_tst_rdev;01720off_tst_size;/*filesize*/01721time_tst_atime;/*timeoflastaccess*/01722time_tst_mtime;/*timeoflastdatamodification*/01723time_tst_ctime;/*timeoflastfilestatuschange*/01724};0172501726/*Traditionalmaskdefinitionsforst_mode.
*/01727/*Theuglycastsononlysomeofthedefinitionsaretoavoidsuprisingsign01728*extensionssuchasS_IFREG!
=(mode_t)S_IFREGwhenintsare32bits.
01729*/01730#defineS_IFMT((mode_t)0170000)/*typeoffile*/01731#defineS_IFLNK((mode_t)0120000)/*symboliclink,notimplemented*/01732#defineS_IFREG((mode_t)0100000)/*regular*/01733#defineS_IFBLK0060000/*blockspecial*/01734#defineS_IFDIR0040000/*directory*/01735#defineS_IFCHR0020000/*characterspecial*/01736#defineS_IFIFO0010000/*thisisaFIFO*/01737#defineS_ISUID0004000/*setuseridonexecution*/01738#defineS_ISGID0002000/*setgroupidonexecution*/01739/*nextisreservedforfutureuse*/01740#defineS_ISVTX01000/*saveswappedtextevenafteruse*/0174101742/*POSIXmasksforst_mode.
*/01743#defineS_IRWXU00700/*owner:rwx-01744#defineS_IRUSR00400/*owner:r-01745#defineS_IWUSR00200/*owner:-w-01746#defineS_IXUSR00100/*owner:--x-0174701748#defineS_IRWXG00070/*group:---rwx---*/01749#defineS_IRGRP00040/*group:---r-----*/01750#defineS_IWGRP00020/*group:----w----*/01751#defineS_IXGRP00010/*group:-----x---*/0175201753#defineS_IRWXO00007/*others:------rwx*/01754#defineS_IROTH00004/*others:------r--*/MINIXSOURCECODEFile:include/sys/stat.
h52301755#defineS_IWOTH00002/*others:w-*/01756#defineS_IXOTH00001/*others:x*/0175701758/*Thefollowingmacrostestst_mode(fromPOSIXSec.
5.
6.
1.
1).
*/01759#defineS_ISREG(m)(((m)&S_IFMT)==S_IFREG)/*isaregfile*/01760#defineS_ISDIR(m)(((m)&S_IFMT)==S_IFDIR)/*isadirectory*/01761#defineS_ISCHR(m)(((m)&S_IFMT)==S_IFCHR)/*isacharspec*/01762#defineS_ISBLK(m)(((m)&S_IFMT)==S_IFBLK)/*isablockspec*/01763#defineS_ISFIFO(m)(((m)&S_IFMT)==S_IFIFO)/*isapipe/FIFO*/01764#defineS_ISLNK(m)(((m)&S_IFMT)==S_IFLNK)/*isasymlink*/0176501766/*FunctionPrototypes.
*/01767_PROTOTYPE(intchmod,(constchar*_path,_mnx_Mode_t_mode));01768_PROTOTYPE(intfstat,(int_fildes,structstat*_buf));01769_PROTOTYPE(intmkdir,(constchar*_path,_mnx_Mode_t_mode));01770_PROTOTYPE(intmkfifo,(constchar*_path,_mnx_Mode_t_mode));01771_PROTOTYPE(intstat,(constchar*_path,structstat*_buf));01772_PROTOTYPE(mode_tumask,(_mnx_Mode_t_cmask));0177301774/*OpenGroupBaseSpecificationsIssue6(notcomplete)*/01775_PROTOTYPE(intlstat,(constchar*_path,structstat*_buf));0177601777#endif/*_STAT_H*/include/sys/dir.
h01800/*Theheadergivesthelayoutofadirectory.
*/0180101802#ifndef_DIR_H01803#define_DIR_H0180401805#include0180601807#defineDIRBLKSIZ512/*sizeofdirectoryblock*/0180801809#ifndefDIRSIZ01810#defineDIRSIZ6001811#endif0181201813structdirect{01814ino_td_ino;01815chard_name[DIRSIZ];01816};0181701818#endif/*_DIR_H*/include/sys/wait.
h01900/*Theheadercontainsmacrosrelatedtowait().
Thevalue01901*returnedbywait()andwaitpid()dependsonwhethertheprocess01902*terminatedbyanexit()call,waskilledbyasignal,orwasstopped01903*duetojobcontrol,asfollows:01904*524File:include/sys/wait.
hMINIXSOURCECODE01905*HighbyteLowbyte0190601907*exit(status)|status|0|0190801909*killedbysignal|0|signal|0191001911*stopped(jobcontrol)|signal|0177|0191201913*/0191401915#ifndef_WAIT_H01916#define_WAIT_H0191701918#ifndef_TYPES_H01919#include01920#endif0192101922#define_LOW(v)((v)&0377)01923#define_HIGH(v)(((v)>>8)&0377)0192401925#defineWNOHANG1/*donotwaitforchildtoexit*/01926#defineWUNTRACED2/*forjobcontrol;notimplemented*/0192701928#defineWIFEXITED(s)(_LOW(s)==0)/*normalexit*/01929#defineWEXITSTATUS(s)(_HIGH(s))/*exitstatus*/01930#defineWTERMSIG(s)(_LOW(s)&0177)/*sigvalue*/01931#defineWIFSIGNALED(s)(((unsignedint)(s)-1&0xFFFF)/*'T''t''k'*/02016#include/*'d'*/02017#include/*'m'*/02018#include/*'c'*/02019MINIXSOURCECODEFile:include/sys/ioctl.
h52502020#endif/*_S_IOCTL_H*/include/sys/ioc_disk.
h02100/*sys/ioc_disk.
h-Diskioctl()commandcodes.
Author:KeesJ.
Bot02101*23Nov200202102*02103*/0210402105#ifndef_S_I_DISK_H02106#define_S_I_DISK_H0210702108#include0210902110#defineDIOCSETP_IOW('d',3,structpartition)02111#defineDIOCGETP_IOR('d',4,structpartition)02112#defineDIOCEJECT_IO('d',5)02113#defineDIOCTIMEOUT_IOW('d',6,int)02114#defineDIOCOPENCT_IOR('d',7,int)0211502116#endif/*_S_I_DISK_H*/include/minix/ioctl.
h02200/*minix/ioctl.
h-Ioctlhelperdefinitions.
Author:KeesJ.
Bot02201*23Nov200202202*02203*Thisfileisincludedbyeveryheaderfilethatdefinesioctlcodes.
02204*/0220502206#ifndef_M_IOCTL_H02207#define_M_IOCTL_H0220802209#ifndef_TYPES_H02210#include02211#endif0221202213#if_EM_WSIZE>=402214/*Ioctlshavethecommandencodedinthelow-orderword,andthesize02215*oftheparameterinthehigh-orderword.
The3highbitsofthehigh-02216*orderwordareusedtoencodethein/out/voidstatusoftheparameter.
02217*/02218#define_IOCPARM_MASK0x1FFF02219#define_IOC_VOID0x2000000002220#define_IOCTYPE_MASK0xFFFF02221#define_IOC_IN0x4000000002222#define_IOC_OUT0x8000000002223#define_IOC_INOUT(_IOC_IN|_IOC_OUT)02224526File:include/minix/ioctl.
hMINIXSOURCECODE02225#define_IO(x,y)((x.
02325*/02326#include0232702328#defineMACHINE_MINIX_MACHINE0232902330#defineIBM_PC_MACHINE_IBM_PC02331#defineSUN_4_MACHINE_SUN_402332#defineSUN_4_60_MACHINE_SUN_4_6002333#defineATARI_MACHINE_ATARI02334#defineMACINTOSH_MACHINE_MACINTOSHMINIXSOURCECODEFile:include/minix/config.
h5270233502336/*Numberofslotsintheprocesstablefornon-kernelprocesses.
Thenumber02337*ofsystemprocessesdefineshowmanyprocesseswithspecialprivileges02338*therecanbe.
Userprocessessharethesamepropertiesandcountforone.
02339*02340*Thesecanbechangedinsys_config.
h.
02341*/02342#defineNR_PROCS_NR_PROCS02343#defineNR_SYS_PROCS_NR_SYS_PROCS0234402345#defineNR_BUFS12802346#defineNR_BUF_HASH1280234702348/*Numberofcontrollertasks(/dev/cNdeviceclasses).
*/02349#defineNR_CTRLRS20235002351/*EnableordisablethesecondlevelfilesystemcacheontheRAMdisk.
*/02352#defineENABLE_CACHE200235302354/*Enableordisableswappingprocessestodisk.
*/02355#defineENABLE_SWAP00235602357/*Includeorexcludeanimageof/dev/bootinthebootimage.
02358*Pleaseupdatethemakefilein/usr/src/tools/aswell.
02359*/02360#defineENABLE_BOOTDEV0/*loadimageof/dev/bootatboottime*/0236102362/*DMA_SECTORSmaybeincreasedtospeedupDMAbaseddrivers.
*/02363#defineDMA_SECTORS1/*DMAbuffersize(mustbe>=1)*/0236402365/*Includeorexcludebackwardscompatibilitycode.
*/02366#defineENABLE_BINCOMPAT0/*forbinariesusingobsoletecalls*/02367#defineENABLE_SRCCOMPAT0/*forsourcesusingobsoletecalls*/0236802369/*Whichprocessshouldreceivediagnosticsfromthekernelandsystem02370*DirectlysendingittoTTYonlydisplaystheoutput.
Sendingittothe02371*logdriverwillcausethediagnosticstobebufferedanddisplayed.
02372*/02373#defineOUTPUT_PROC_NRLOG_PROC_NR/*TTY_PROC_NRorLOG_PROC_NR*/0237402375/*NR_CONS,NR_RS_LINES,andNR_PTYSdeterminethenumberofterminalsthe02376*systemcanhandle.
02377*/02378#defineNR_CONS4/*#systemconsoles(1to8)*/02379#defineNR_RS_LINES0/*#rs232terminals(0to4)*/02380#defineNR_PTYS0/*#pseudoterminals(0to64)*/023810238202383*Therearenouser-settableparametersafterthisline*0238402385/*SettheCHIPtypebasedonthemachineselected.
ThesymbolCHIPisactually02386*indicativeofmorethanjusttheCPU.
Forexample,machinesforwhich02387*CHIP==INTELareexpectedtohave8259Ainterrruptcontrollersandthe02388*otherpropertiesofIBMPC/XT/AT/386typesmachinesingeneral.
*/02389#defineINTEL_CHIP_INTEL/*CHIPtypeforPC,XT,AT,386andclones*/02390#defineM68000_CHIP_M68000/*CHIPtypeforAtari,Amiga,Macintosh*/02391#defineSPARC_CHIP_SPARC/*CHIPtypeforSUN-4(e.
g.
SPARCstation)*/0239202393/*SettheFP_FORMATtypebasedonthemachineselected,eitherhworsw*/02394#defineFP_NONE_FP_NONE/*nofloatingpointsupport*/528File:include/minix/config.
hMINIXSOURCECODE02395#defineFP_IEEE_FP_IEEE/*conformIEEEfloatingpointstandard*/0239602397/*_MINIX_CHIPisdefinedinsys_config.
h.
*/02398#defineCHIP_MINIX_CHIP0239902400/*_MINIX_FP_FORMATisdefinedinsys_config.
h.
*/02401#defineFP_FORMAT_MINIX_FP_FORMAT0240202403/*_ASKDEVand_FASTLOADaredefinedinsys_config.
h.
*/02404#defineASKDEV_ASKDEV02405#defineFASTLOAD_FASTLOAD0240602407#endif/*_CONFIG_H*/include/minix/sys_config.
h02500#ifndef_MINIX_SYS_CONFIG_H02501#define_MINIX_SYS_CONFIG_H10250202503/*Thisisamodifiedsys_config.
hforcompilingasmallMinixsystem02504*withonlytheoptionsdescribedinthetext,OperatingSystemsDesignand02505*Implementation,3rdedition.
Seethesys_config.
hinthefull02506*sourcecodedirectoryforinformationonalternativesomittedhere.
02507*/025080250902510*Thissectioncontainsuser-settableparameters*0251102512#define_MINIX_MACHINE_MACHINE_IBM_PC0251302514#define_MACHINE_IBM_PC1/*any8088or80x86-basedsystem*/0251502516/*Wordsizeinbytes(aconstantequaltosizeof(int)).
*/02517#if__ACK__||__GNUC__02518#define_WORD_SIZE_EM_WSIZE02519#define_PTR_SIZE_EM_WSIZE02520#endif0252102522#define_NR_PROCS6402523#define_NR_SYS_PROCS320252402525/*SettheCHIPtypebasedonthemachineselected.
ThesymbolCHIPisactually02526*indicativeofmorethanjusttheCPU.
Forexample,machinesforwhich02527*CHIP==INTELareexpectedtohave8259Ainterrruptcontrollersandthe02528*otherpropertiesofIBMPC/XT/AT/386typesmachinesingeneral.
*/02529#define_CHIP_INTEL1/*CHIPtypeforPC,XT,AT,386andclones*/0253002531/*SettheFP_FORMATtypebasedonthemachineselected,eitherhworsw*/02532#define_FP_NONE0/*nofloatingpointsupport*/02533#define_FP_IEEE1/*conformIEEEfloatingpointstandard*/0253402535#define_MINIX_CHIP_CHIP_INTEL0253602537#define_MINIX_FP_FORMAT_FP_NONE0253802539#ifndef_MINIX_MACHINEMINIXSOURCECODEFile:include/minix/sys_config.
h52902540error"Inpleasedefine_MINIX_MACHINE"02541#endif0254202543#ifndef_MINIX_CHIP02544error"Inpleasedefine_MINIX_MACHINEtohavealegalvalue"02545#endif0254602547#if(_MINIX_MACHINE==0)02548error"_MINIX_MACHINEhasincorrectvalue(0)"02549#endif0255002551#endif/*_MINIX_SYS_CONFIG_H*/0255202553include/minix/const.
h02600/*Copyright(C)2001byPrentice-Hall,Inc.
Seethecopyrightnoticein02601*thefile/usr/src/LICENSE.
02602*/0260302604#ifndefCHIP02605#errorCHIPisnotdefined02606#endif0260702608#defineEXTERNextern/*usedin*.
hfiles*/02609#definePRIVATEstatic/*PRIVATExlimitsthescopeofx*/02610#definePUBLIC/*PUBLICistheoppositeofPRIVATE*/02611#defineFORWARDstatic/*somecompilersrequirethistobe'static'*/0261202613#defineTRUE1/*usedforturningintegersintoBooleans*/02614#defineFALSE0/*usedforturningintegersintoBooleans*/0261502616#defineHZ60/*clockfreq(softwaresettableonIBM-PC)*/0261702618#defineSUPER_USER(uid_t)0/*uid_tofsuperuser*/0261902620/*Devices.
*/02621#defineMAJOR8/*majordevice=(dev>>MAJOR)&0377*/02622#defineMINOR0/*minordevice=(dev>>MINOR)&0377*/0262302624#defineNULL((void*)0)/*nullpointer*/02625#defineCPVEC_NR16/*max#ofentriesinaSYS_VCOPYrequest*/02626#defineCPVVEC_NR64/*max#ofentriesinaSYS_VCOPYrequest*/02627#defineNR_IOREQSMIN(NR_BUFS,64)02628/*maximumnumberofentriesinaniorequest*/0262902630/*Messagepassingconstants.
*/02631#defineMESS_SIZE(sizeof(message))/*mightneedusizeoffromFShere*/02632#defineNIL_MESS((message*)0)/*nullpointer*/0263302634/*Memoryrelatedconstants.
*/02635#defineSEGMENT_TYPE0xFF00/*bitmasktogetsegmenttype*/02636#defineSEGMENT_INDEX0x00FF/*bitmasktogetsegmentindex*/0263702638#defineLOCAL_SEG0x0000/*flagsindicatinglocalmemorysegment*/02639#defineNR_LOCAL_SEGS3/*#localsegmentsperprocess(fixed)*/530File:include/minix/const.
hMINIXSOURCECODE02640#defineT0/*proc[i].
mem_map[T]isfortext*/02641#defineD1/*proc[i].
mem_map[D]isfordata*/02642#defineS2/*proc[i].
mem_map[S]isforstack*/0264302644#defineREMOTE_SEG0x0100/*flagsindicatingremotememorysegment*/02645#defineNR_REMOTE_SEGS3/*#remotememoryregions(variable)*/0264602647#defineBIOS_SEG0x0200/*flagsindicatingBIOSmemorysegment*/02648#defineNR_BIOS_SEGS3/*#BIOSmemoryregions(variable)*/0264902650#definePHYS_SEG0x0400/*flagindicatingentirephysicalmemory*/0265102652/*Labelsusedtodisablecodesectionsfordifferentreasons.
*/02653#defineDEAD_CODE0/*unusedcodeinnormalconfiguration*/02654#defineFUTURE_CODE0/*newcodetobeactivated+testedlater*/02655#defineTEMP_CODE1/*activecodetoberemovedlater*/0265602657/*ProcessnamelengthinthePMprocesstable,including'\0'.
*/02658#definePROC_NAME_LEN160265902660/*Miscellaneous*/02661#defineBYTE0377/*maskfor8bits*/02662#defineREADING0/*copydatatouser*/02663#defineWRITING1/*copydatafromuser*/02664#defineNO_NUM0x8000/*usedasnumericalargumenttopanic()*/02665#defineNIL_PTR(char*)0/*generallyusefulexpression*/02666#defineHAVE_SCATTERED_IO1/*scatteredI/Oisnowstandard*/0266702668/*Macros.
*/02669#defineMAX(a,b)((a)>(b)(a):(b))02670#defineMIN(a,b)((a)=HCLICK_SIZE02687#defineclick_to_hclick(n)((n)>(HCLICK_SHIFT-CLICK_SHIFT))02690#endif02691#definehclick_to_physb(n)((phys_bytes)(n)>HCLICK_SHIFT)0269302694#defineABS-999/*thisprocessmeansabsolutememory*/0269502696/*Flagbitsfori_modeintheinode.
*/02697#defineI_TYPE0170000/*thisfieldgivesinodetype*/02698#defineI_REGULAR0100000/*regularfile,notdirorspecial*/02699#defineI_BLOCK_SPECIAL0060000/*blockspecialfile*/MINIXSOURCECODEFile:include/minix/const.
h53102700#defineI_DIRECTORY0040000/*fileisadirectory*/02701#defineI_CHAR_SPECIAL0020000/*characterspecialfile*/02702#defineI_NAMED_PIPE0010000/*namedpipe(FIFO)*/02703#defineI_SET_UID_BIT0004000/*seteffectiveuid_tonexec*/02704#defineI_SET_GID_BIT0002000/*seteffectivegid_tonexec*/02705#defineALL_MODES0006777/*allbitsforuser,groupandothers*/02706#defineRWX_MODES0000777/*modebitsforRWXonly*/02707#defineR_BIT0000004/*Rwxprotectionbit*/02708#defineW_BIT0000002/*rWxprotectionbit*/02709#defineX_BIT0000001/*rwXprotectionbit*/02710#defineI_NOT_ALLOC0000000/*thisinodeisfree*/0271102712/*Flagusedonlyinflagsargumentofdev_open.
*/02713#defineRO_BIT0200000/*Opendevicereadonly;failifwritable.
*/0271402715/*Somelimits.
*/02716#defineMAX_BLOCK_NR((block_t)077777777)/*largestblocknumber*/02717#defineHIGHEST_ZONE((zone_t)077777777)/*largestzonenumber*/02718#defineMAX_INODE_NR((ino_t)037777777777)/*largestinodenumber*/02719#defineMAX_FILE_POS((off_t)037777777777)/*largestlegalfileoffset*/0272002721#defineNO_BLOCK((block_t)0)/*absenceofablocknumber*/02722#defineNO_ENTRY((ino_t)0)/*absenceofadirentry*/02723#defineNO_ZONE((zone_t)0)/*absenceofazonenumber*/02724#defineNO_DEV((dev_t)0)/*absenceofadevicenumb*/include/minix/type.
h02800#ifndef_TYPE_H02801#define_TYPE_H0280202803#ifndef_MINIX_SYS_CONFIG_H02804#include02805#endif0280602807#ifndef_TYPES_H02808#include02809#endif0281002811/*Typedefinitions.
*/02812typedefunsignedintvir_clicks;/*virtualaddr/lengthinclicks*/02813typedefunsignedlongphys_bytes;/*physicaladdr/lengthinbytes*/02814typedefunsignedintphys_clicks;/*physicaladdr/lengthinclicks*/0281502816#if(_MINIX_CHIP==_CHIP_INTEL)02817typedefunsignedintvir_bytes;/*virtualaddressesandlengthsinbytes*/02818#endif0281902820#if(_MINIX_CHIP==_CHIP_M68000)02821typedefunsignedlongvir_bytes;/*virtualaddressesandlengthsinbytes*/02822#endif0282302824#if(_MINIX_CHIP==_CHIP_SPARC)02825typedefunsignedlongvir_bytes;/*virtualaddressesandlengthsinbytes*/02826#endif0282702828/*Memorymapforlocaltext,stack,datasegments.
*/02829structmem_map{532File:include/minix/type.
hMINIXSOURCECODE02830vir_clicksmem_vir;/*virtualaddress*/02831phys_clicksmem_phys;/*physicaladdress*/02832vir_clicksmem_len;/*length*/02833};0283402835/*Memorymapforremotememoryareas,e.
g.
,fortheRAMdisk.
*/02836structfar_mem{02837intin_use;/*entryinuse,unlesszero*/02838phys_clicksmem_phys;/*physicaladdress*/02839vir_clicksmem_len;/*length*/02840};0284102842/*Structureforvirtualcopyingbymeansofavectorwithrequests.
*/02843structvir_addr{02844intproc_nr;02845intsegment;02846vir_bytesoffset;02847};0284802849#definephys_cp_reqvir_cp_req02850structvir_cp_req{02851structvir_addrsrc;02852structvir_addrdst;02853phys_bytescount;02854};0285502856typedefstruct{02857vir_bytesiov_addr;/*addressofanI/Obuffer*/02858vir_bytesiov_size;/*sizeofanI/Obuffer*/02859}iovec_t;0286002861/*PMpassestheaddressofastructureofthistypetoKERNELwhen02862*sys_sendsig()isinvokedaspartofthesignalcatchingmechanism.
02863*ThestructurecontainalltheinformationthatKERNELneedstobuild02864*thesignalstack.
02865*/02866structsigmsg{02867intsm_signo;/*signalnumberbeingcaught*/02868unsignedlongsm_mask;/*masktorestorewhenhandlerreturns*/02869vir_bytessm_sighandler;/*addressofhandler*/02870vir_bytessm_sigreturn;/*addressof_sigreturninClibrary*/02871vir_bytessm_stkptr;/*userstackpointer*/02872};0287302874/*ThisisusedtoobtainsysteminformationthroughSYS_GETINFO.
*/02875structkinfo{02876phys_bytescode_base;/*baseofkernelcode*/02877phys_bytescode_size;02878phys_bytesdata_base;/*baseofkerneldata*/02879phys_bytesdata_size;02880vir_bytesproc_addr;/*virtualaddressofprocesstable*/02881phys_byteskmem_base;/*kernelmemorylayout(/dev/kmem)*/02882phys_byteskmem_size;02883phys_bytesbootdev_base;/*bootdevicefrombootimage(/dev/boot)*/02884phys_bytesbootdev_size;02885phys_bytesbootdev_mem;02886phys_bytesparams_base;/*parameterspassedbybootmonitor*/02887phys_bytesparams_size;02888intnr_procs;/*numberofuserprocesses*/02889intnr_tasks;/*numberofkerneltasks*/MINIXSOURCECODEFile:include/minix/type.
h53302890charrelease[6];/*kernelreleasenumber*/02891charversion[6];/*kernelversionnumber*/02892intrelocking;/*relockingcheck(fordebugging)*/02893};0289402895structmachine{02896intpc_at;02897intps_mca;02898intprocessor;02899intprotected;02900intvdu_ega;02901intvdu_vga;02902};0290302904#endif/*_TYPE_H*/include/minix/ipc.
h03000#ifndef_IPC_H03001#define_IPC_H030020300303004*Typesrelatingtomessages.
*030050300603007#defineM1103008#defineM3303009#defineM4403010#defineM3_STRING140301103012typedefstruct{intm1i1,m1i2,m1i3;char*m1p1,*m1p2,*m1p3;}mess_1;03013typedefstruct{intm2i1,m2i2,m2i3;longm2l1,m2l2;char*m2p1;}mess_2;03014typedefstruct{intm3i1,m3i2;char*m3p1;charm3ca1[M3_STRING];}mess_3;03015typedefstruct{longm4l1,m4l2,m4l3,m4l4,m4l5;}mess_4;03016typedefstruct{shortm5c1,m5c2;intm5i1,m5i2;longm5l1,m5l2,m5l3;}mess_5;03017typedefstruct{intm7i1,m7i2,m7i3,m7i4;char*m7p1,*m7p2;}mess_7;03018typedefstruct{intm8i1,m8i2;char*m8p1,*m8p2,*m8p3,*m8p4;}mess_8;0301903020typedefstruct{03021intm_source;/*whosentthemessage*/03022intm_type;/*whatkindofmessageisit*/03023union{03024mess_1m_m1;03025mess_2m_m2;03026mess_3m_m3;03027mess_4m_m4;03028mess_5m_m5;03029mess_7m_m7;03030mess_8m_m8;03031}m_u;03032}message;0303303034/*Thefollowingdefinesprovidenamesforusefulmembers.
*/03035#definem1_i1m_u.
m_m1.
m1i103036#definem1_i2m_u.
m_m1.
m1i203037#definem1_i3m_u.
m_m1.
m1i303038#definem1_p1m_u.
m_m1.
m1p103039#definem1_p2m_u.
m_m1.
m1p2534File:include/minix/ipc.
hMINIXSOURCECODE03040#definem1_p3m_u.
m_m1.
m1p30304103042#definem2_i1m_u.
m_m2.
m2i103043#definem2_i2m_u.
m_m2.
m2i203044#definem2_i3m_u.
m_m2.
m2i303045#definem2_l1m_u.
m_m2.
m2l103046#definem2_l2m_u.
m_m2.
m2l203047#definem2_p1m_u.
m_m2.
m2p10304803049#definem3_i1m_u.
m_m3.
m3i103050#definem3_i2m_u.
m_m3.
m3i203051#definem3_p1m_u.
m_m3.
m3p103052#definem3_ca1m_u.
m_m3.
m3ca10305303054#definem4_l1m_u.
m_m4.
m4l103055#definem4_l2m_u.
m_m4.
m4l203056#definem4_l3m_u.
m_m4.
m4l303057#definem4_l4m_u.
m_m4.
m4l403058#definem4_l5m_u.
m_m4.
m4l50305903060#definem5_c1m_u.
m_m5.
m5c103061#definem5_c2m_u.
m_m5.
m5c203062#definem5_i1m_u.
m_m5.
m5i103063#definem5_i2m_u.
m_m5.
m5i203064#definem5_l1m_u.
m_m5.
m5l103065#definem5_l2m_u.
m_m5.
m5l203066#definem5_l3m_u.
m_m5.
m5l30306703068#definem7_i1m_u.
m_m7.
m7i103069#definem7_i2m_u.
m_m7.
m7i203070#definem7_i3m_u.
m_m7.
m7i303071#definem7_i4m_u.
m_m7.
m7i403072#definem7_p1m_u.
m_m7.
m7p103073#definem7_p2m_u.
m_m7.
m7p20307403075#definem8_i1m_u.
m_m8.
m8i103076#definem8_i2m_u.
m_m8.
m8i203077#definem8_p1m_u.
m_m8.
m8p103078#definem8_p2m_u.
m_m8.
m8p203079#definem8_p3m_u.
m_m8.
m8p303080#definem8_p4m_u.
m_m8.
m8p4030810308203083*Minixrun-timesystem(IPC).
*030840308503086/*Hidenamestoavoidnamespacepollution.
*/03087#defineecho_echo03088#definenotify_notify03089#definesendrec_sendrec03090#definereceive_receive03091#definesend_send03092#definenb_receive_nb_receive03093#definenb_send_nb_send0309403095_PROTOTYPE(intecho,(message*m_ptr));03096_PROTOTYPE(intnotify,(intdest));03097_PROTOTYPE(intsendrec,(intsrc_dest,message*m_ptr));03098_PROTOTYPE(intreceive,(intsrc,message*m_ptr));03099_PROTOTYPE(intsend,(intdest,message*m_ptr));MINIXSOURCECODEFile:include/minix/ipc.
h53503100_PROTOTYPE(intnb_receive,(intsrc,message*m_ptr));03101_PROTOTYPE(intnb_send,(intdest,message*m_ptr));0310203103#endif/*_IPC_H*/include/minix/syslib.
h03200/*Prototypesforsystemlibraryfunctions.
*/0320103202#ifndef_SYSLIB_H03203#define_SYSLIB_H0320403205#ifndef_TYPES_H03206#include03207#endif0320803209#ifndef_IPC_H03210#include03211#endif0321203213#ifndef_DEVIO_H03214#include03215#endif0321603217/*Forwarddeclaration*/03218structreg86u;0321903220#defineSYSTASKSYSTEM032210322203223*Minixsystemlibrary.
*0322403225_PROTOTYPE(int_taskcall,(intwho,intsyscallnr,message*msgptr));0322603227_PROTOTYPE(intsys_abort,(inthow,.
.
.
));03228_PROTOTYPE(intsys_exec,(intproc,char*ptr,03229char*aout,vir_bytesinitpc));03230_PROTOTYPE(intsys_fork,(intparent,intchild));03231_PROTOTYPE(intsys_newmap,(intproc,structmem_map*ptr));03232_PROTOTYPE(intsys_exit,(intproc));03233_PROTOTYPE(intsys_trace,(intreq,intproc,longaddr,long*data_p));0323403235_PROTOTYPE(intsys_svrctl,(intproc,intreq,intpriv,vir_bytesargp));03236_PROTOTYPE(intsys_nice,(intproc,intpriority));0323703238_PROTOTYPE(intsys_int86,(structreg86u*reg86p));0323903240/*Shorthandsforsys_sdevio()systemcall.
*/03241#definesys_insb(port,proc_nr,buffer,count)\03242sys_sdevio(DIO_INPUT,port,DIO_BYTE,proc_nr,buffer,count)03243#definesys_insw(port,proc_nr,buffer,count)\03244sys_sdevio(DIO_INPUT,port,DIO_WORD,proc_nr,buffer,count)03245#definesys_outsb(port,proc_nr,buffer,count)\03246sys_sdevio(DIO_OUTPUT,port,DIO_BYTE,proc_nr,buffer,count)03247#definesys_outsw(port,proc_nr,buffer,count)\03248sys_sdevio(DIO_OUTPUT,port,DIO_WORD,proc_nr,buffer,count)03249_PROTOTYPE(intsys_sdevio,(intreq,longport,inttype,intproc_nr,536File:include/minix/syslib.
hMINIXSOURCECODE03250void*buffer,intcount));0325103252/*Clockfunctionality:getsystemtimesor(un)scheduleanalarmcall.
*/03253_PROTOTYPE(intsys_times,(intproc_nr,clock_t*ptr));03254_PROTOTYPE(intsys_setalarm,(clock_texp_time,intabs_time));0325503256/*Shorthandsforsys_irqctl()systemcall.
*/03257#definesys_irqdisable(hook_id)\03258sys_irqctl(IRQ_DISABLE,0,0,hook_id)03259#definesys_irqenable(hook_id)\03260sys_irqctl(IRQ_ENABLE,0,0,hook_id)03261#definesys_irqsetpolicy(irq_vec,policy,hook_id)\03262sys_irqctl(IRQ_SETPOLICY,irq_vec,policy,hook_id)03263#definesys_irqrmpolicy(irq_vec,hook_id)\03264sys_irqctl(IRQ_RMPOLICY,irq_vec,0,hook_id)03265_PROTOTYPE(intsys_irqctl,(intrequest,intirq_vec,intpolicy,03266int*irq_hook_id));0326703268/*Shorthandsforsys_vircopy()andsys_physcopy()systemcalls.
*/03269#definesys_biosin(bios_vir,dst_vir,bytes)\03270sys_vircopy(SELF,BIOS_SEG,bios_vir,SELF,D,dst_vir,bytes)03271#definesys_biosout(src_vir,bios_vir,bytes)\03272sys_vircopy(SELF,D,src_vir,SELF,BIOS_SEG,bios_vir,bytes)03273#definesys_datacopy(src_proc,src_vir,dst_proc,dst_vir,bytes)\03274sys_vircopy(src_proc,D,src_vir,dst_proc,D,dst_vir,bytes)03275#definesys_textcopy(src_proc,src_vir,dst_proc,dst_vir,bytes)\03276sys_vircopy(src_proc,T,src_vir,dst_proc,T,dst_vir,bytes)03277#definesys_stackcopy(src_proc,src_vir,dst_proc,dst_vir,bytes)\03278sys_vircopy(src_proc,S,src_vir,dst_proc,S,dst_vir,bytes)03279_PROTOTYPE(intsys_vircopy,(intsrc_proc,intsrc_seg,vir_bytessrc_vir,03280intdst_proc,intdst_seg,vir_bytesdst_vir,phys_bytesbytes));0328103282#definesys_abscopy(src_phys,dst_phys,bytes)\03283sys_physcopy(NONE,PHYS_SEG,src_phys,NONE,PHYS_SEG,dst_phys,bytes)03284_PROTOTYPE(intsys_physcopy,(intsrc_proc,intsrc_seg,vir_bytessrc_vir,03285intdst_proc,intdst_seg,vir_bytesdst_vir,phys_bytesbytes));03286_PROTOTYPE(intsys_memset,(unsignedlongpattern,03287phys_bytesbase,phys_bytesbytes));0328803289/*Vectoredvirtual/physicalcopycalls.
*/03290#ifDEAD_CODE/*librarypartnotyetimplemented*/03291_PROTOTYPE(intsys_virvcopy,(phys_cp_req*vec_ptr,intvec_size,int*nr_ok));03292_PROTOTYPE(intsys_physvcopy,(phys_cp_req*vec_ptr,intvec_size,int*nr_ok));03293#endif0329403295_PROTOTYPE(intsys_umap,(intproc_nr,intseg,vir_bytesvir_addr,03296vir_bytesbytes,phys_bytes*phys_addr));03297_PROTOTYPE(intsys_segctl,(int*index,u16_t*seg,vir_bytes*off,03298phys_bytesphys,vir_bytessize));0329903300/*Shorthandsforsys_getinfo()systemcall.
*/03301#definesys_getkmessages(dst)sys_getinfo(GET_KMESSAGES,dst,0,0,0)03302#definesys_getkinfo(dst)sys_getinfo(GET_KINFO,dst,0,0,0)03303#definesys_getmachine(dst)sys_getinfo(GET_MACHINE,dst,0,0,0)03304#definesys_getproctab(dst)sys_getinfo(GET_PROCTAB,dst,0,0,0)03305#definesys_getprivtab(dst)sys_getinfo(GET_PRIVTAB,dst,0,0,0)03306#definesys_getproc(dst,nr)sys_getinfo(GET_PROC,dst,0,0,nr)03307#definesys_getrandomness(dst)sys_getinfo(GET_RANDOMNESS,dst,0,0,0)03308#definesys_getimage(dst)sys_getinfo(GET_IMAGE,dst,0,0,0)03309#definesys_getirqhooks(dst)sys_getinfo(GET_IRQHOOKS,dst,0,0,0)MINIXSOURCECODEFile:include/minix/syslib.
h53703310#definesys_getmonparams(v,vl)sys_getinfo(GET_MONPARAMS,v,vl,0,0)03311#definesys_getschedinfo(v1,v2)sys_getinfo(GET_SCHEDINFO,v1,0,v2,0)03312#definesys_getlocktimings(dst)sys_getinfo(GET_LOCKTIMING,dst,0,0,0)03313#definesys_getbiosbuffer(virp,sizep)sys_getinfo(GET_BIOSBUFFER,virp,\03314sizeof(*virp),sizep,sizeof(*sizep))03315_PROTOTYPE(intsys_getinfo,(intrequest,void*val_ptr,intval_len,03316void*val_ptr2,intval_len2));0331703318/*Signalcontrol.
*/03319_PROTOTYPE(intsys_kill,(intproc,intsig));03320_PROTOTYPE(intsys_sigsend,(intproc_nr,structsigmsg*sig_ctxt));03321_PROTOTYPE(intsys_sigreturn,(intproc_nr,structsigmsg*sig_ctxt));03322_PROTOTYPE(intsys_getksig,(int*k_proc_nr,sigset_t*k_sig_map));03323_PROTOTYPE(intsys_endksig,(intproc_nr));0332403325/*NOTE:twodifferentapproacheswereusedtodistinguishthedeviceI/O03326*types'byte','word','long':thelatteruses#defineandresultsina03327*smallerimplementation,butloosesthestatictypechecking.
03328*/03329_PROTOTYPE(intsys_voutb,(pvb_pair_t*pvb_pairs,intnr_ports));03330_PROTOTYPE(intsys_voutw,(pvw_pair_t*pvw_pairs,intnr_ports));03331_PROTOTYPE(intsys_voutl,(pvl_pair_t*pvl_pairs,intnr_ports));03332_PROTOTYPE(intsys_vinb,(pvb_pair_t*pvb_pairs,intnr_ports));03333_PROTOTYPE(intsys_vinw,(pvw_pair_t*pvw_pairs,intnr_ports));03334_PROTOTYPE(intsys_vinl,(pvl_pair_t*pvl_pairs,intnr_ports));0333503336/*Shorthandsforsys_out()systemcall.
*/03337#definesys_outb(p,v)sys_out((p),(unsignedlong)(v),DIO_BYTE)03338#definesys_outw(p,v)sys_out((p),(unsignedlong)(v),DIO_WORD)03339#definesys_outl(p,v)sys_out((p),(unsignedlong)(v),DIO_LONG)03340_PROTOTYPE(intsys_out,(intport,unsignedlongvalue,inttype));0334103342/*Shorthandsforsys_in()systemcall.
*/03343#definesys_inb(p,v)sys_in((p),(unsignedlong*)(v),DIO_BYTE)03344#definesys_inw(p,v)sys_in((p),(unsignedlong*)(v),DIO_WORD)03345#definesys_inl(p,v)sys_in((p),(unsignedlong*)(v),DIO_LONG)03346_PROTOTYPE(intsys_in,(intport,unsignedlong*value,inttype));0334703348#endif/*_SYSLIB_H*/03349include/minix/sysutil.
h03400#ifndef_EXTRALIB_H03401#define_EXTRALIB_H0340203403/*Extrasystemlibrarydefinitionstosupportdevicedriversandservers.
03404*03405*Created:03406*Mar15,2004byJorritN.
Herder03407*03408*Changes:03409*May31,2005:addedprintf,kputc(relocatedfromsyslib)03410*May31,2005:addedgetuptime03411*Mar18,2005:addedtickdelay03412*Oct01,2004:addedenv_parse,env_prefix,env_panic03413*Jul13,2004:addedfkey_ctl03414*Apr28,2004:addedreport,panic538File:include/minix/sysutil.
hMINIXSOURCECODE03415*Mar31,2004:setuplikeotherlibraries,suchassyslib03416*/034170341803419*Miscellaneoushelperfunctions.
034200342103422/*Environmentparsingreturnvalues.
*/03423#defineEP_BUF_SIZE128/*localbufferforenvvalue*/03424#defineEP_UNSET0/*variablenotset*/03425#defineEP_OFF1/*var=off*/03426#defineEP_ON2/*var=on(orfieldleftblank)*/03427#defineEP_SET3/*var=1:2:3(nonblankfield)*/03428#defineEP_EGETKENV4/*sys_getkenv()failed.
.
.
*/0342903430_PROTOTYPE(voidenv_setargs,(intargc,char*argv[]));03431_PROTOTYPE(intenv_get_param,(char*key,char*value,intmax_size));03432_PROTOTYPE(intenv_prefix,(char*env,char*prefix));03433_PROTOTYPE(voidenv_panic,(char*key));03434_PROTOTYPE(intenv_parse,(char*env,char*fmt,intfield,long*param,03435longmin,longmax));0343603437#definefkey_map(fkeys,sfkeys)fkey_ctl(FKEY_MAP,(fkeys),(sfkeys))03438#definefkey_unmap(fkeys,sfkeys)fkey_ctl(FKEY_UNMAP,(fkeys),(sfkeys))03439#definefkey_events(fkeys,sfkeys)fkey_ctl(FKEY_EVENTS,(fkeys),(sfkeys))03440_PROTOTYPE(intfkey_ctl,(intreq,int*fkeys,int*sfkeys));0344103442_PROTOTYPE(intprintf,(constchar*fmt,.
.
.
));03443_PROTOTYPE(voidkputc,(intc));03444_PROTOTYPE(voidreport,(char*who,char*mess,intnum));03445_PROTOTYPE(voidpanic,(char*who,char*mess,intnum));03446_PROTOTYPE(intgetuptime,(clock_t*ticks));03447_PROTOTYPE(inttickdelay,(clock_tticks));0344803449#endif/*_EXTRALIB_H*/03450include/minix/callnr.
h03500#defineNCALLS91/*numberofsystemcallsallowed*/0350103502#defineEXIT103503#defineFORK203504#defineREAD303505#defineWRITE403506#defineOPEN503507#defineCLOSE603508#defineWAIT703509#defineCREAT803510#defineLINK903511#defineUNLINK1003512#defineWAITPID1103513#defineCHDIR1203514#defineTIME13MINIXSOURCECODEFile:include/minix/callnr.
h53903515#defineMKNOD1403516#defineCHMOD1503517#defineCHOWN1603518#defineBRK1703519#defineSTAT1803520#defineLSEEK1903521#defineGETPID2003522#defineMOUNT2103523#defineUMOUNT2203524#defineSETUID2303525#defineGETUID2403526#defineSTIME2503527#definePTRACE2603528#defineALARM2703529#defineFSTAT2803530#definePAUSE2903531#defineUTIME3003532#defineACCESS3303533#defineSYNC3603534#defineKILL3703535#defineRENAME3803536#defineMKDIR3903537#defineRMDIR4003538#defineDUP4103539#definePIPE4203540#defineTIMES4303541#defineSETGID4603542#defineGETGID4703543#defineSIGNAL4803544#defineIOCTL5403545#defineFCNTL5503546#defineEXEC5903547#defineUMASK6003548#defineCHROOT6103549#defineSETSID6203550#defineGETPGRP630355103552/*Thefollowingarenotsystemcalls,butareprocessedlikethem.
*/03553#defineUNPAUSE65/*toMMorFS:checkforEINTR*/03554#defineREVIVE67/*toFS:reviveasleepingprocess*/03555#defineTASK_REPLY68/*toFS:replycodefromttytask*/0355603557/*Posixsignalhandling.
*/03558#defineSIGACTION7103559#defineSIGSUSPEND7203560#defineSIGPENDING7303561#defineSIGPROCMASK7403562#defineSIGRETURN750356303564#defineREBOOT76/*toPM*/0356503566/*MINIXspecificcalls,e.
g.
,tosupportsystemservices.
*/03567#defineSVRCTL7703568/*unused*/03569#defineGETSYSINFO79/*toPMorFS*/03570#defineGETPROCNR80/*toPM*/03571#defineDEVCTL81/*toFS*/03572#defineFSTATFS82/*toFS*/03573#defineALLOCMEM83/*toPM*/03574#defineFREEMEM84/*toPM*/540File:include/minix/callnr.
hMINIXSOURCECODE03575#defineSELECT85/*toFS*/03576#defineFCHDIR86/*toFS*/03577#defineFSYNC87/*toFS*/03578#defineGETPRIORITY88/*toPM*/03579#defineSETPRIORITY89/*toPM*/03580#defineGETTIMEOFDAY90/*toPM*/include/minix/com.
h03600#ifndef_MINIX_COM_H03601#define_MINIX_COM_H036020360303604*Magicprocessnumbers*036050360603607#defineANY0x7ace/*usedtoindicate'anyprocess'*/03608#defineNONE0x6ace/*usedtoindicate'noprocessatall'*/03609#defineSELF0x8ace/*usedtoindicate'ownprocess'*/036100361103612*Processnumbersofprocessesinthesystemimage*036130361403615/*Thevaluesofseveraltasknumbersdependonwhethertheyorothertasks03616*areenabled.
Theyaredefinedas(PREVIOUS_TASK-ENABLE_TASK)ingeneral.
03617*ENABLE_TASKiseither0or1,soataskeithergetsanewnumber,orgets03618*thesamenumberastheprevioustaskandisfurtherunused.
Notethatthe03619*ordershouldcorrespondtotheorderinthetasktabledefinedintable.
c.
03620*/0362103622/*Kerneltasks.
Theseallruninthesameaddressspace.
*/03623#defineIDLE-4/*runswhennooneelsecanrun*/03624#defineCLOCK-3/*alarmsandotherclockfunctions*/03625#defineSYSTEM-2/*requestsystemfunctionality*/03626#defineKERNEL-1/*pseudo-processforIPCandscheduling*/03627#defineHARDWAREKERNEL/*forhardwareinterrupthandlers*/0362803629/*Numberoftasks.
NotethatNR_PROCSisdefinedin.
*/03630#defineNR_TASKS40363103632/*User-spaceprocesses,thatis,devicedrivers,servers,andINIT.
*/03633#definePM_PROC_NR0/*processmanager*/03634#defineFS_PROC_NR1/*filesystem*/03635#defineRS_PROC_NR2/*reincarnationserver*/03636#defineMEM_PROC_NR3/*memorydriver(RAMdisk,null,etc.
)*/03637#defineLOG_PROC_NR4/*logdevicedriver*/03638#defineTTY_PROC_NR5/*terminal(TTY)driver*/03639#defineDRVR_PROC_NR6/*devicedriverforbootmedium*/03640#defineINIT_PROC_NR7/*init--goesmultiuser*/0364103642/*Numberofprocessescontainedinthesystemimage.
*/03643#defineNR_BOOT_PROCS(NR_TASKS+INIT_PROC_NR+1)03644MINIXSOURCECODEFile:include/minix/com.
h5410364503646*Kernelnotificationtypes*036470364803649/*Kernelnotificationtypes.
Inprinciple,thesecanbesenttoanyprocess,03650*somakesurethatthesetypesdonotinterferewithothermessagetypes.
03651*Notificationsareprioritizedbecauseofthewaytheyareunhold()and03652*blockingnotificationsaredelivered.
Thelowestnumbersgofirst.
The03653*offsetareusedfortheper-processnotificationbitmaps.
03654*/03655#defineNOTIFY_MESSAGE0x100003656#defineNOTIFY_FROM(p_nr)(NOTIFY_MESSAGE|((p_nr)+NR_TASKS))03657#defineSYN_ALARMNOTIFY_FROM(CLOCK)/*synchronousalarm*/03658#defineSYS_SIGNOTIFY_FROM(SYSTEM)/*systemsignal*/03659#defineHARD_INTNOTIFY_FROM(HARDWARE)/*hardwareinterrupt*/03660#defineNEW_KSIGNOTIFY_FROM(HARDWARE)/*newkernelsignal*/03661#defineFKEY_PRESSEDNOTIFY_FROM(TTY_PROC_NR)/*functionkeypress*/0366203663/*Shorthandsformessageparameterspassedwithnotifications.
*/03664#defineNOTIFY_SOURCEm_source03665#defineNOTIFY_TYPEm_type03666#defineNOTIFY_ARGm2_l103667#defineNOTIFY_TIMESTAMPm2_l203668#defineNOTIFY_FLAGSm2_i1036690367003671*MessagesforBLOCKandCHARACTERdevicedrivers*036720367303674/*Messagetypesfordevicedrivers.
*/03675#defineDEV_RQ_BASE0x400/*basefordevicerequesttypes*/03676#defineDEV_RS_BASE0x500/*basefordeviceresponsetypes*/0367703678#defineCANCEL(DEV_RQ_BASE+0)/*generalreqtoforceatasktocancel*/03679#defineDEV_READ(DEV_RQ_BASE+3)/*readfromminordevice*/03680#defineDEV_WRITE(DEV_RQ_BASE+4)/*writetominordevice*/03681#defineDEV_IOCTL(DEV_RQ_BASE+5)/*I/Ocontrolcode*/03682#defineDEV_OPEN(DEV_RQ_BASE+6)/*openaminordevice*/03683#defineDEV_CLOSE(DEV_RQ_BASE+7)/*closeaminordevice*/03684#defineDEV_SCATTER(DEV_RQ_BASE+8)/*writefromavector*/03685#defineDEV_GATHER(DEV_RQ_BASE+9)/*readintoavector*/03686#defineTTY_SETPGRP(DEV_RQ_BASE+10)/*setprocessgroup*/03687#defineTTY_EXIT(DEV_RQ_BASE+11)/*processgroupleaderexited*/03688#defineDEV_SELECT(DEV_RQ_BASE+12)/*requestselect()attention*/03689#defineDEV_STATUS(DEV_RQ_BASE+13)/*requestdriverstatus*/0369003691#defineDEV_REPLY(DEV_RS_BASE+0)/*generaltaskreply*/03692#defineDEV_CLONED(DEV_RS_BASE+1)/*returnclonedminor*/03693#defineDEV_REVIVE(DEV_RS_BASE+2)/*driverrevivesprocess*/03694#defineDEV_IO_READY(DEV_RS_BASE+3)/*selecteddeviceready*/03695#defineDEV_NO_STATUS(DEV_RS_BASE+4)/*emptystatusreply*/0369603697/*Fieldnamesformessagestoblockandcharacterdevicedrivers.
*/03698#defineDEVICEm2_i1/*major-minordevice*/03699#definePROC_NRm2_i2/*which(proc)wantsI/O*/03700#defineCOUNTm2_i3/*howmanybytestotransfer*/03701#defineREQUESTm2_i3/*ioctlrequestcode*/03702#definePOSITIONm2_l1/*fileoffset*/03703#defineADDRESSm2_p1/*corebufferaddress*/03704542File:include/minix/com.
hMINIXSOURCECODE03705/*FieldnamesforDEV_SELECTmessagestodevicedrivers.
*/03706#defineDEV_MINORm2_i1/*minordevice*/03707#defineDEV_SEL_OPSm2_i2/*whichselectoperationsarerequested*/03708#defineDEV_SEL_WATCHm2_i3/*requestnotifyifnooperationsareready*/0370903710/*Fieldnamesusedinreplymessagesfromtasks.
*/03711#defineREP_PROC_NRm2_i1/*#ofproconwhosebehalfI/Owasdone*/03712#defineREP_STATUSm2_i2/*bytestransferredorerrornumber*/03713#defineSUSPEND-998/*statustosuspendcaller,replylater*/0371403715/*FieldnamesformessagestoTTYdriver.
*/03716#defineTTY_LINEDEVICE/*messageparameter:terminalline*/03717#defineTTY_REQUESTCOUNT/*messageparameter:ioctlrequestcode*/03718#defineTTY_SPEKPOSITION/*messageparameter:ioctlspeed,erasing*/03719#defineTTY_FLAGSm2_l2/*messageparameter:ioctlttymode*/03720#defineTTY_PGRPm2_i3/*messageparameter:processgroup*/0372103722/*FieldnamesfortheQIC02statusreplyfromtapedriver*/03723#defineTAPE_STAT0m2_l103724#defineTAPE_STAT1m2_l2037250372603727*Messagesfornetworkinglayer*037280372903730/*Messagetypesfornetworklayerrequests.
Thislayeractslikeadriver.
*/03731#defineNW_OPENDEV_OPEN03732#defineNW_CLOSEDEV_CLOSE03733#defineNW_READDEV_READ03734#defineNW_WRITEDEV_WRITE03735#defineNW_IOCTLDEV_IOCTL03736#defineNW_CANCELCANCEL0373703738/*Basetypefordatalinklayerrequestsandresponses.
*/03739#defineDL_RQ_BASE0x80003740#defineDL_RS_BASE0x9000374103742/*Messagetypesfordatalinklayerrequests.
*/03743#defineDL_WRITE(DL_RQ_BASE+3)03744#defineDL_WRITEV(DL_RQ_BASE+4)03745#defineDL_READ(DL_RQ_BASE+5)03746#defineDL_READV(DL_RQ_BASE+6)03747#defineDL_INIT(DL_RQ_BASE+7)03748#defineDL_STOP(DL_RQ_BASE+8)03749#defineDL_GETSTAT(DL_RQ_BASE+9)0375003751/*Messagetypefordatalinklayerreplies.
*/03752#defineDL_INIT_REPLY(DL_RS_BASE+20)03753#defineDL_TASK_REPLY(DL_RS_BASE+21)0375403755/*Fieldnamesfordatalinklayermessages.
*/03756#defineDL_PORTm2_i103757#defineDL_PROCm2_i203758#defineDL_COUNTm2_i303759#defineDL_MODEm2_l103760#defineDL_CLCKm2_l203761#defineDL_ADDRm2_p103762#defineDL_STATm2_l10376303764/*Bitsin'DL_STAT'fieldofDLreplies.
*/MINIXSOURCECODEFile:include/minix/com.
h54303765#defineDL_PACK_SEND0x0103766#defineDL_PACK_RECV0x0203767#defineDL_READ_IP0x040376803769/*Bitsin'DL_MODE'fieldofDLrequests.
*/03770#defineDL_NOMODE0x003771#defineDL_PROMISC_REQ0x203772#defineDL_MULTI_REQ0x403773#defineDL_BROAD_REQ0x8037740377503776*SYSTASKrequesttypesandfieldnames*037770377803779/*Systemlibrarycallsaredispatchedviaacallvector,sobecarefulwhen03780*modifyingthesystemcallnumbers.
Thenumbersheredeterminewhichcall03781*ismadefromthecallvector.
03782*/03783#defineKERNEL_CALL0x600/*baseforkernelcallstoSYSTEM*/0378403785#defineSYS_FORK(KERNEL_CALL+0)/*sys_fork()*/03786#defineSYS_EXEC(KERNEL_CALL+1)/*sys_exec()*/03787#defineSYS_EXIT(KERNEL_CALL+2)/*sys_exit()*/03788#defineSYS_NICE(KERNEL_CALL+3)/*sys_nice()*/03789#defineSYS_PRIVCTL(KERNEL_CALL+4)/*sys_privctl()*/03790#defineSYS_TRACE(KERNEL_CALL+5)/*sys_trace()*/03791#defineSYS_KILL(KERNEL_CALL+6)/*sys_kill()*/0379203793#defineSYS_GETKSIG(KERNEL_CALL+7)/*sys_getsig()*/03794#defineSYS_ENDKSIG(KERNEL_CALL+8)/*sys_endsig()*/03795#defineSYS_SIGSEND(KERNEL_CALL+9)/*sys_sigsend()*/03796#defineSYS_SIGRETURN(KERNEL_CALL+10)/*sys_sigreturn()*/0379703798#defineSYS_NEWMAP(KERNEL_CALL+11)/*sys_newmap()*/03799#defineSYS_SEGCTL(KERNEL_CALL+12)/*sys_segctl()*/03800#defineSYS_MEMSET(KERNEL_CALL+13)/*sys_memset()*/0380103802#defineSYS_UMAP(KERNEL_CALL+14)/*sys_umap()*/03803#defineSYS_VIRCOPY(KERNEL_CALL+15)/*sys_vircopy()*/03804#defineSYS_PHYSCOPY(KERNEL_CALL+16)/*sys_physcopy()*/03805#defineSYS_VIRVCOPY(KERNEL_CALL+17)/*sys_virvcopy()*/03806#defineSYS_PHYSVCOPY(KERNEL_CALL+18)/*sys_physvcopy()*/0380703808#defineSYS_IRQCTL(KERNEL_CALL+19)/*sys_irqctl()*/03809#defineSYS_INT86(KERNEL_CALL+20)/*sys_int86()*/03810#defineSYS_DEVIO(KERNEL_CALL+21)/*sys_devio()*/03811#defineSYS_SDEVIO(KERNEL_CALL+22)/*sys_sdevio()*/03812#defineSYS_VDEVIO(KERNEL_CALL+23)/*sys_vdevio()*/0381303814#defineSYS_SETALARM(KERNEL_CALL+24)/*sys_setalarm()*/03815#defineSYS_TIMES(KERNEL_CALL+25)/*sys_times()*/03816#defineSYS_GETINFO(KERNEL_CALL+26)/*sys_getinfo()*/03817#defineSYS_ABORT(KERNEL_CALL+27)/*sys_abort()*/0381803819#defineNR_SYS_CALLS28/*numberofsystemcalls*/0382003821/*FieldnamesforSYS_MEMSET,SYS_SEGCTL.
*/03822#defineMEM_PTRm2_p1/*base*/03823#defineMEM_COUNTm2_l1/*count*/03824#defineMEM_PATTERNm2_l2/*patterntowrite*/544File:include/minix/com.
hMINIXSOURCECODE03825#defineMEM_CHUNK_BASEm4_l1/*physicalbaseaddress*/03826#defineMEM_CHUNK_SIZEm4_l2/*sizeofmemchunk*/03827#defineMEM_TOT_SIZEm4_l3/*totalmemorysize*/03828#defineMEM_CHUNK_TAGm4_l4/*tagtoidentifychunkofmem*/0382903830/*FieldnamesforSYS_DEVIO,SYS_VDEVIO,SYS_SDEVIO.
*/03831#defineDIO_REQUESTm2_i3/*deviceinoroutput*/03832#defineDIO_INPUT0/*input*/03833#defineDIO_OUTPUT1/*output*/03834#defineDIO_TYPEm2_i1/*flagindicatingbyte,word,orlong*/03835#defineDIO_BYTE'b'/*bytetypevalues*/03836#defineDIO_WORD'w'/*wordtypevalues*/03837#defineDIO_LONG'l'/*longtypevalues*/03838#defineDIO_PORTm2_l1/*singleportaddress*/03839#defineDIO_VALUEm2_l2/*singleI/Ovalue*/03840#defineDIO_VEC_ADDRm2_p1/*addressofbufferor(p,v)-pairs*/03841#defineDIO_VEC_SIZEm2_l2/*numberofelementsinvector*/03842#defineDIO_VEC_PROCm2_i2/*numberofprocesswherevectoris*/0384303844/*FieldnamesforSYS_SIGNARLM,SYS_FLAGARLM,SYS_SYNCALRM.
*/03845#defineALRM_EXP_TIMEm2_l1/*expiretimeforthealarmcall*/03846#defineALRM_ABS_TIMEm2_i2/*setto1touseabsolutealarmtime*/03847#defineALRM_TIME_LEFTm2_l1/*howmanytickswereremaining*/03848#defineALRM_PROC_NRm2_i1/*whichprocesswantsthealarm*/03849#defineALRM_FLAG_PTRm2_p1/*virtualaddressoftimeoutflag*/0385003851/*FieldnamesforSYS_IRQCTL.
*/03852#defineIRQ_REQUESTm5_c1/*whattodo*/03853#defineIRQ_SETPOLICY1/*manageaslotoftheIRQtable*/03854#defineIRQ_RMPOLICY2/*removeaslotoftheIRQtable*/03855#defineIRQ_ENABLE3/*enableinterrupts*/03856#defineIRQ_DISABLE4/*disableinterrupts*/03857#defineIRQ_VECTORm5_c2/*irqvector*/03858#defineIRQ_POLICYm5_i1/*optionsforIRQCTLrequest*/03859#defineIRQ_REENABLE0x001/*reenableIRQlineafterinterrupt*/03860#defineIRQ_BYTE0x100/*bytevalues*/03861#defineIRQ_WORD0x200/*wordvalues*/03862#defineIRQ_LONG0x400/*longvalues*/03863#defineIRQ_PROC_NRm5_i2/*processnumber,SELF,NONE*/03864#defineIRQ_HOOK_IDm5_l3/*idofirqhookatkernel*/0386503866/*FieldnamesforSYS_SEGCTL.
*/03867#defineSEG_SELECTm4_l1/*segmentselectorreturned*/03868#defineSEG_OFFSETm4_l2/*offsetinsegmentreturned*/03869#defineSEG_PHYSm4_l3/*physicaladdressofsegment*/03870#defineSEG_SIZEm4_l4/*segmentsize*/03871#defineSEG_INDEXm4_l5/*segmentindexinremotemap*/0387203873/*FieldnamesforSYS_VIDCOPY.
*/03874#defineVID_REQUESTm4_l1/*whattodo*/03875#defineVID_VID_COPY1/*requestvid_vid_copy()*/03876#defineMEM_VID_COPY2/*requestmem_vid_copy()*/03877#defineVID_SRC_ADDRm4_l2/*virtualaddressinmemory*/03878#defineVID_SRC_OFFSETm4_l3/*offsetinvideomemory*/03879#defineVID_DST_OFFSETm4_l4/*offsetinvideomemory*/03880#defineVID_CP_COUNTm4_l5/*numberofwordstobecopied*/0388103882/*FieldnamesforSYS_ABORT.
*/03883#defineABRT_HOWm1_i1/*RBT_REBOOT,RBT_HALT,etc.
*/03884#defineABRT_MON_PROCm1_i2/*processwheremonitorparamsare*/MINIXSOURCECODEFile:include/minix/com.
h54503885#defineABRT_MON_LENm1_i3/*lengthofmonitorparams*/03886#defineABRT_MON_ADDRm1_p1/*virtualaddressofmonitorparams*/0388703888/*Fieldnamesfor_UMAP,_VIRCOPY,_PHYSCOPY.
*/03889#defineCP_SRC_SPACEm5_c1/*TorDspace(stackisalsoD)*/03890#defineCP_SRC_PROC_NRm5_i1/*processtocopyfrom*/03891#defineCP_SRC_ADDRm5_l1/*addresswheredatacomefrom*/03892#defineCP_DST_SPACEm5_c2/*TorDspace(stackisalsoD)*/03893#defineCP_DST_PROC_NRm5_i2/*processtocopyto*/03894#defineCP_DST_ADDRm5_l2/*addresswheredatagoto*/03895#defineCP_NR_BYTESm5_l3/*numberofbytestocopy*/0389603897/*FieldnamesforSYS_VCOPYandSYS_VVIRCOPY.
*/03898#defineVCP_NR_OKm1_i2/*numberofsuccessfullcopies*/03899#defineVCP_VEC_SIZEm1_i3/*sizeofcopyvector*/03900#defineVCP_VEC_ADDRm1_p1/*pointertocopyvector*/0390103902/*FieldnamesforSYS_GETINFO.
*/03903#defineI_REQUESTm7_i3/*whatinfotoget*/03904#defineGET_KINFO0/*getkernelinformationstructure*/03905#defineGET_IMAGE1/*getsystemimagetable*/03906#defineGET_PROCTAB2/*getkernelprocesstable*/03907#defineGET_RANDOMNESS3/*getrandomnessbuffer*/03908#defineGET_MONPARAMS4/*getmonitorparameters*/03909#defineGET_KENV5/*getkernelenvironmentstring*/03910#defineGET_IRQHOOKS6/*gettheIRQtable*/03911#defineGET_KMESSAGES7/*getkernelmessages*/03912#defineGET_PRIVTAB8/*getkernelprivilegestable*/03913#defineGET_KADDRESSES9/*getvariouskerneladdresses*/03914#defineGET_SCHEDINFO10/*getschedulingqueues*/03915#defineGET_PROC11/*getprocessslotifgivenprocess*/03916#defineGET_MACHINE12/*getmachineinformation*/03917#defineGET_LOCKTIMING13/*getlock()/unlock()latencytiming*/03918#defineGET_BIOSBUFFER14/*getabufferforBIOScalls*/03919#defineI_PROC_NRm7_i4/*callingprocess*/03920#defineI_VAL_PTRm7_p1/*virtualaddressatcaller*/03921#defineI_VAL_LENm7_i1/*maxlengthofvalue*/03922#defineI_VAL_PTR2m7_p2/*secondvirtualaddress*/03923#defineI_VAL_LEN2m7_i2/*secondlength,orprocnr*/0392403925/*FieldnamesforSYS_TIMES.
*/03926#defineT_PROC_NRm4_l1/*processtorequesttimeinfofor*/03927#defineT_USER_TIMEm4_l1/*usertimeconsumedbyprocess*/03928#defineT_SYSTEM_TIMEm4_l2/*systemtimeconsumedbyprocess*/03929#defineT_CHILD_UTIMEm4_l3/*usertimeconsumedbyprocess'children*/03930#defineT_CHILD_STIMEm4_l4/*systimeconsumedbyprocess'children*/03931#defineT_BOOT_TICKSm4_l5/*numberofclocktickssinceboottime*/0393203933/*FieldnamesforSYS_TRACE,SYS_SVRCTL.
*/03934#defineCTL_PROC_NRm2_i1/*processnumberofthecaller*/03935#defineCTL_REQUESTm2_i2/*servercontrolrequest*/03936#defineCTL_MM_PRIVm2_i3/*privilegeasseenbyPM*/03937#defineCTL_ARG_PTRm2_p1/*pointertoargument*/03938#defineCTL_ADDRESSm2_l1/*addressattracedprocess'space*/03939#defineCTL_DATAm2_l2/*datafieldfortracing*/0394003941/*FieldnamesforSYS_KILL,SYS_SIGCTL*/03942#defineSIG_REQUESTm2_l2/*PMsignalcontrolrequest*/03943#defineS_GETSIG0/*getpendingkernelsignal*/03944#defineS_ENDSIG1/*finishakernelsignal*/546File:include/minix/com.
hMINIXSOURCECODE03945#defineS_SENDSIG2/*POSIXstylesignalhandling*/03946#defineS_SIGRETURN3/*returnfromPOSIXhandling*/03947#defineS_KILL4/*serverskillsprocesswithsignal*/03948#defineSIG_PROCm2_i1/*processnumberforinform*/03949#defineSIG_NUMBERm2_i2/*signalnumbertosend*/03950#defineSIG_FLAGSm2_i3/*signalflagsfield*/03951#defineSIG_MAPm2_l1/*usedbykerneltopasssignalbitmap*/03952#defineSIG_CTXT_PTRm2_p1/*pointertoinfotorestoresignalcontext*/0395303954/*FieldnamesforSYS_FORK,_EXEC,_EXIT,_NEWMAP.
*/03955#definePR_PROC_NRm1_i1/*indicatesa(child)process*/03956#definePR_PRIORITYm1_i2/*processpriority*/03957#definePR_PPROC_NRm1_i2/*indicatesa(parent)process*/03958#definePR_PIDm1_i3/*processidatprocessmanager*/03959#definePR_STACK_PTRm1_p1/*usedforstackptrinsys_exec,sys_getsp*/03960#definePR_TRACINGm1_i3/*flagtoindicatetracingison/off*/03961#definePR_NAME_PTRm1_p2/*tellswhereprogramnameisfordmp*/03962#definePR_IP_PTRm1_p3/*initialvalueforipafterexec*/03963#definePR_MEM_PTRm1_p1/*tellswherememorymapisforsys_newmap*/0396403965/*FieldnamesforSYS_INT86*/03966#defineINT86_REG86m1_p1/*pointertoregisters*/0396703968/*FieldnamesforSELECT(FS).
*/03969#defineSEL_NFDSm8_i103970#defineSEL_READFDSm8_p103971#defineSEL_WRITEFDSm8_p203972#defineSEL_ERRORFDSm8_p303973#defineSEL_TIMEOUTm8_p4039740397503976*Messagesforsystemmanagementserver*039770397803979#defineSRV_RQ_BASE0x7000398003981#defineSRV_UP(SRV_RQ_BASE+0)/*startsystemservice*/03982#defineSRV_DOWN(SRV_RQ_BASE+1)/*stopsystemservice*/03983#defineSRV_STATUS(SRV_RQ_BASE+2)/*getservicestatus*/0398403985#defineSRV_PATH_ADDRm1_p1/*pathofbinary*/03986#defineSRV_PATH_LENm1_i1/*lengthofbinary*/03987#defineSRV_ARGS_ADDRm1_p2/*argumentstobepassed*/03988#defineSRV_ARGS_LENm1_i2/*lengthofarguments*/03989#defineSRV_DEV_MAJORm1_i3/*majordevicenumber*/03990#defineSRV_PRIV_ADDRm1_p3/*privilegesstring*/03991#defineSRV_PRIV_LENm1_i3/*lengthofprivileges*/039920399303994*MiscellaneousmessagesusedbyTTY*039950399603997/*Miscellaneousrequesttypesandfieldnames,e.
g.
usedbyISserver.
*/03998#definePANIC_DUMPS97/*debugdumpsattheTTYonRBT_PANIC*/03999#defineFKEY_CONTROL98/*controlafunctionkeyattheTTY*/04000#defineFKEY_REQUESTm2_i1/*requesttoperformatTTY*/04001#defineFKEY_MAP10/*observefunctionkey*/04002#defineFKEY_UNMAP11/*stopobservingfunctionkey*/04003#defineFKEY_EVENTS12/*requestopenkeypresses*/04004#defineFKEY_FKEYSm2_l1/*F1-F12keyspressed*/MINIXSOURCECODEFile:include/minix/com.
h54704005#defineFKEY_SFKEYSm2_l2/*Shift-F1-F12keyspressed*/04006#defineDIAGNOSTICS100/*outputastringwithoutFSinbetween*/04007#defineDIAG_PRINT_BUFm1_p104008#defineDIAG_BUF_COUNTm1_i104009#defineDIAG_PROC_NRm1_i20401004011#endif/*_MINIX_COM_H*/include/minix/devio.
h04100/*Thisfileprovidesbasictypesandsomeconstantsforthe04101*SYS_DEVIOandSYS_VDEVIOsystemcalls,whichallowuser-level04102*processestoperformdeviceI/O.
04103*04104*Created:04105*Apr08,2004byJorritN.
Herder04106*/0410704108#ifndef_DEVIO_H04109#define_DEVIO_H0411004111#include/*neededtoinclude*/04112#include/*u8_t,u16_t,u32_tneeded*/0411304114typedefu16_tport_t;04115typedefU16_tPort_t;0411604117/*WehavedifferentgranularitiesofportI/O:8,16,32bits.
04118*Alsosee,whichhasfunctionsforbytes,words,04119*andlongs.
Hence,weneeddifferent(port,value)-pairtypes.
04120*/04121typedefstruct{u16_tport;u8_tvalue;}pvb_pair_t;04122typedefstruct{u16_tport;u16_tvalue;}pvw_pair_t;04123typedefstruct{u16_tport;u32_tvalue;}pvl_pair_t;0412404125/*Macroshorthandtoset(port,value)-pair.
*/04126#definepv_set(pv,p,v)((pv).
port=(p),(pv).
value=(v))04127#definepv_ptr_set(pv_ptr,p,v)((pv_ptr)->port=(p),(pv_ptr)->value=(v))0412804129#endif/*_DEVIO_H*/include/minix/dmap.
h04200#ifndef_DMAP_H04201#define_DMAP_H0420204203#include04204#include04205548File:include/minix/dmap.
hMINIXSOURCECODE0420604207*DeviceDriverTable*042080420904210/*Devicetable.
Thistableisindexedbymajordevicenumber.
Itprovides04211*thelinkbetweenmajordevicenumbersandtheroutinesthatprocessthem.
04212*Thetablecanbeupdatedynamically.
Thefield'dmap_flags'describean04213*entry'scurrentstatusanddetermineswhatcontroloptionsarepossible.
04214*/04215#defineDMAP_MUTABLE0x01/*mappingcanbeovertaken*/04216#defineDMAP_BUSY0x02/*driverbusywithrequest*/0421704218enumdev_style{STYLE_DEV,STYLE_NDEV,STYLE_TTY,STYLE_CLONE};0421904220externstructdmap{04221int_PROTOTYPE((*dmap_opcl),(int,Dev_t,int,int));04222void_PROTOTYPE((*dmap_io),(int,message*));04223intdmap_driver;04224intdmap_flags;04225}dmap[];042260422704228*Majorandminordevicenumbers*042290423004231/*Totalnumberofdifferentdevices.
*/04232#defineNR_DEVICES32/*numberof(major)devices*/0423304234/*MajorandminordevicenumbersforMEMORYdriver.
*/04235#defineMEMORY_MAJOR1/*majordeviceformemorydevices*/04236#defineRAM_DEV0/*minordevicefor/dev/ram*/04237#defineMEM_DEV1/*minordevicefor/dev/mem*/04238#defineKMEM_DEV2/*minordevicefor/dev/kmem*/04239#defineNULL_DEV3/*minordevicefor/dev/null*/04240#defineBOOT_DEV4/*minordevicefor/dev/boot*/04241#defineZERO_DEV5/*minordevicefor/dev/zero*/0424204243#defineCTRLR(n)((n)==03:(8+2*((n)-1)))/*magicformula*/0424404245/*FulldevicenumbersthatarespecialtothebootmonitorandFS.
*/04246#defineDEV_RAM0x0100/*devicenumberof/dev/ram*/04247#defineDEV_BOOT0x0104/*devicenumberof/dev/boot*/0424804249#defineFLOPPY_MAJOR2/*majordeviceforfloppydisks*/04250#defineTTY_MAJOR4/*majordeviceforttys*/04251#defineCTTY_MAJOR5/*majordevicefor/dev/tty*/0425204253#defineINET_MAJOR7/*majordeviceforinet*/0425404255#defineLOG_MAJOR15/*majordeviceforlogdriver*/04256#defineIS_KLOG_DEV0/*minordevicefor/dev/klog*/0425704258#endif/*_DMAP_H*/MINIXSOURCECODEFile:include/ibm/portio.
h549include/ibm/portio.
h04300/*04301ibm/portio.
h0430204303Created:Jan15,1992byPhilipHomburg04304*/0430504306#ifndef_PORTIO_H_04307#define_PORTIO_H_0430804309#ifndef_TYPES_H04310#include04311#endif0431204313unsignedinb(U16_t_port);04314unsignedinw(U16_t_port);04315unsignedinl(U32_t_port);04316voidoutb(U16_t_port,U8_t_value);04317voidoutw(U16_t_port,U16_t_value);04318voidoutl(U16_t_port,U32_t_value);04319voidinsb(U16_t_port,void*_buf,size_t_count);04320voidinsw(U16_t_port,void*_buf,size_t_count);04321voidinsl(U16_t_port,void*_buf,size_t_count);04322voidoutsb(U16_t_port,void*_buf,size_t_count);04323voidoutsw(U16_t_port,void*_buf,size_t_count);04324voidoutsl(U16_t_port,void*_buf,size_t_count);04325voidintr_disable(void);04326voidintr_enable(void);0432704328#endif/*_PORTIO_H_*/include/ibm/interrupt.
h04400/*Interruptnumbersandhardwarevectors.
*/0440104402#ifndef_INTERRUPT_H04403#define_INTERRUPT_H0440404405#if(CHIP==INTEL)0440604407/*8259Ainterruptcontrollerports.
*/04408#defineINT_CTL0x20/*I/Oportforinterruptcontroller*/04409#defineINT_CTLMASK0x21/*settingbitsinthisportdisablesints*/04410#defineINT2_CTL0xA0/*I/Oportforsecondinterruptcontroller*/04411#defineINT2_CTLMASK0xA1/*settingbitsinthisportdisablesints*/0441204413/*Magicnumbersforinterruptcontroller.
*/04414#defineEND_OF_INT0x20/*codeusedtore-enableafteraninterrupt*/0441504416/*Interruptvectorsdefined/reservedbyprocessor.
*/04417#defineDIVIDE_VECTOR0/*divideerror*/04418#defineDEBUG_VECTOR1/*singlestep(trace)*/04419#defineNMI_VECTOR2/*non-maskableinterrupt*/550File:include/ibm/interrupt.
hMINIXSOURCECODE04420#defineBREAKPOINT_VECTOR3/*softwarebreakpoint*/04421#defineOVERFLOW_VECTOR4/*fromINTO*/0442204423/*Fixedsystemcallvector.
*/04424#defineSYS_VECTOR32/*systemcallsaremadewithintSYSVEC*/04425#defineSYS386_VECTOR33/*except386systemcallsusethis*/04426#defineLEVEL0_VECTOR34/*forexecutionofafunctionatlevel0*/0442704428/*Suitableirqbasesforhardwareinterrupts.
Reprogramthe8259(s)from04429*thePCBIOSdefaultssincetheBIOSdoesn'trespectalltheprocessor's04430*reservedvectors(0to31).
04431*/04432#defineBIOS_IRQ0_VEC0x08/*baseofIRQ0-7vectorsusedbyBIOS*/04433#defineBIOS_IRQ8_VEC0x70/*baseofIRQ8-15vectorsusedbyBIOS*/04434#defineIRQ0_VECTOR0x50/*nicevectorstorelocateIRQ0-7to*/04435#defineIRQ8_VECTOR0x70/*noneedtomoveIRQ8-15*/0443604437/*Hardwareinterruptnumbers.
*/04438#defineNR_IRQ_VECTORS1604439#defineCLOCK_IRQ004440#defineKEYBOARD_IRQ104441#defineCASCADE_IRQ2/*cascadeenablefor2ndATcontroller*/04442#defineETHER_IRQ3/*defaultethernetinterruptvector*/04443#defineSECONDARY_IRQ3/*RS232interruptvectorforport2*/04444#defineRS232_IRQ4/*RS232interruptvectorforport1*/04445#defineXT_WINI_IRQ5/*xtwinchester*/04446#defineFLOPPY_IRQ6/*floppydisk*/04447#definePRINTER_IRQ704448#defineAT_WINI_0_IRQ14/*atwinchestercontroller0*/04449#defineAT_WINI_1_IRQ15/*atwinchestercontroller1*/0445004451/*Interruptnumbertohardwarevector.
*/04452#defineBIOS_VECTOR(irq)\04453(((irq)/*globalconfiguration,MUSTbefirst*/04612#include/*Cstyle:ANSIorK&R,MUSTbesecond*/04613#include/*generalsystemtypes*/04614#include/*MINIXspecificconstants*/04615#include/*MINIXspecifictypes,e.
g.
message*/04616#include/*MINIXrun-timesystem*/04617#include/*watchdogtimermanagement*/04618#include/*returncodesanderrornumbers*/04619#include/*deviceI/Oandtoggleinterrupts*/0462004621/*Importantkernelheaderfiles.
*/04622#include"config.
h"/*configuration,MUSTbefirst*/04623#include"const.
h"/*constants,MUSTbesecond*/04624#include"type.
h"/*typedefinitions,MUSTbethird*/04625#include"proto.
h"/*functionprototypes*/04626#include"glo.
h"/*globalvariables*/04627#include"ipc.
h"/*IPCconstants*/04628/*#include"debug.
h"*//*debugging,MUSTbelastkernelheader*/0462904630#endif/*KERNEL_H*/04631kernel/config.
h04700#ifndefCONFIG_H04701#defineCONFIG_H0470204703/*Thisfiledefinesthekernelconfiguration.
Itallowstosetsizesofsome04704*kernelbuffersandtoenableordisabledebuggingcode,timingfeatures,04705*andindividualkernelcalls.
04706*04707*Changes:04708*Jul11,2005Created.
(JorritN.
Herder)04709*/552File:kernel/config.
hMINIXSOURCECODE0471004711/*Inembeddedandsensorapplications,notallthekernelcallsmaybe04712*needed.
Inthissectionyoucanspecifywhichkernelcallsareneeded04713*andwhicharenot.
Thecodeforunneededkernelcallsisnotincludedin04714*thesystembinary,makingitsmaller.
Ifyouarenotsure,itisbest04715*tokeepallkernelcallsenabled.
04716*/04717#defineUSE_FORK1/*forkanewprocess*/04718#defineUSE_NEWMAP1/*setanewmemorymap*/04719#defineUSE_EXEC1/*updateprocessafterexecute*/04720#defineUSE_EXIT1/*cleanupafterprocessexit*/04721#defineUSE_TRACE1/*processinformationandtracing*/04722#defineUSE_GETKSIG1/*retrievependingkernelsignals*/04723#defineUSE_ENDKSIG1/*finishpendingkernelsignals*/04724#defineUSE_KILL1/*sendasignaltoaprocess*/04725#defineUSE_SIGSEND1/*sendPOSIX-stylesignal*/04726#defineUSE_SIGRETURN1/*sys_sigreturn(proc_nr,ctxt_ptr,flags)*/04727#defineUSE_ABORT1/*shutdownMINIX*/04728#defineUSE_GETINFO1/*retrieveacopyofkerneldata*/04729#defineUSE_TIMES1/*getprocessandsystemtimeinfo*/04730#defineUSE_SETALARM1/*scheduleasynchronousalarm*/04731#defineUSE_DEVIO1/*readorwriteasingleI/Oport*/04732#defineUSE_VDEVIO1/*processvectorwithI/Orequests*/04733#defineUSE_SDEVIO1/*performI/Orequestonabuffer*/04734#defineUSE_IRQCTL1/*setaninterruptpolicy*/04735#defineUSE_SEGCTL1/*setuparemotesegment*/04736#defineUSE_PRIVCTL1/*systemprivilegescontrol*/04737#defineUSE_NICE1/*changeschedulingpriority*/04738#defineUSE_UMAP1/*mapvirtualtophysicaladdress*/04739#defineUSE_VIRCOPY1/*copyusingvirtualaddressing*/04740#defineUSE_VIRVCOPY1/*vectorwithvirtualcopyrequests*/04741#defineUSE_PHYSCOPY1/*copyusingphysicaladdressing*/04742#defineUSE_PHYSVCOPY1/*vectorwithphysicalcopyrequests*/04743#defineUSE_MEMSET1/*writechartoagivenmemoryarea*/0474404745/*Lengthofprogramnamesstoredintheprocesstable.
Thisisonlyused04746*forthedebuggingdumpsthatcanbegeneratedwiththeISserver.
ThePM04747*serverkeepsitsowncopyoftheprogramname.
04748*/04749#defineP_NAME_LEN80475004751/*Kerneldiagnosticsarewrittentoacircularbuffer.
Aftereachmessage,04752*asystemserverisnotifiedandacopyofthebuffercanberetrievedto04753*displaythemessage.
Thebufferssizecansafelybereduced.
04754*/04755#defineKMESS_BUF_SIZE2560475604757/*Buffertogatherrandomness.
Thisisusedtogeneratearandomstreamby04758*theMEMORYdriverwhenreadingfrom/dev/random.
04759*/04760#defineRANDOM_ELEMENTS320476104762/*Thissectioncontainsdefinesforvaluablesystemresourcesthatareused04763*bydevicedrivers.
Thenumberofelementsofthevectorsisdeterminedby04764*themaximumneededbyanygivendriver.
Thenumberofinterrupthooksmay04765*beincrementedonsystemswithmanydevicedrivers.
04766*/04767#defineNR_IRQ_HOOKS16/*numberofinterrupthooks*/04768#defineVDEVIO_BUF_SIZE64/*maxelementsperVDEVIOrequest*/04769#defineVCOPY_VEC_SIZE16/*maxelementsperVCOPYrequest*/MINIXSOURCECODEFile:kernel/config.
h5530477004771/*Howmanybytesforthekernelstack.
Spaceallocatedinmpx.
s.
*/04772#defineK_STACK_BYTES10240477304774/*Thissectionallowstoenablekerneldebuggingandtimingfunctionality.
04775*Fornormaloperationalloptionsshouldbedisabled.
04776*/04777#defineDEBUG_SCHED_CHECK0/*sanitycheckofschedulingqueues*/04778#defineDEBUG_LOCK_CHECK0/*kernellock()sanitycheck*/04779#defineDEBUG_TIME_LOCKS0/*measuretimespentinlocks*/0478004781#endif/*CONFIG_H*/04782kernel/const.
h04800/*Generalmacrosandconstantsusedbythekernel.
*/04801#ifndefCONST_H04802#defineCONST_H0480304804#include/*interruptnumbersandhardwarevectors*/04805#include/*portaddressesandmagicnumbers*/04806#include/*BIOSaddresses,sizesandmagicnumbers*/04807#include/*BIOSaddresses,sizesandmagicnumbers*/04808#include04809#include"config.
h"0481004811/*Totranslateanaddressinkernelspacetoaphysicaladdress.
Thisis04812*thesameasumap_local(proc_ptr,D,vir,sizeof(*vir)),butlesscostly.
04813*/04814#definevir2phys(vir)(kinfo.
data_base+(vir_bytes)(vir))0481504816/*Mapaprocessnumbertoaprivilegestructureid.
*/04817#defines_nr_to_id(n)(NR_TASKS+(n)+1)0481804819/*Translateapointertoafieldinastructuretoapointertothestructure04820*itself.
Soittranslates'&struct_ptr->field'backto'struct_ptr'.
04821*/04822#definestructof(type,field,ptr)\04823((type*)(((char*)(ptr))-offsetof(type,field)))0482404825/*Constantsusedinvirtual_copy().
Valuesmustbe0and1,respectively.
*/04826#define_SRC_004827#define_DST_10482804829/*Numberofrandomsources*/04830#defineRANDOM_SOURCES160483104832/*Constantsandmacrosforbitmapmanipulation.
*/04833#defineBITCHUNK_BITS(sizeof(bitchunk_t)*CHAR_BIT)04834#defineBITMAP_CHUNKS(nr_bits)(((nr_bits)+BITCHUNK_BITS-1)/BITCHUNK_BITS)04835#defineMAP_CHUNK(map,bit)(map)[((bit)/BITCHUNK_BITS)]04836#defineCHUNK_OFFSET(bit)((bit)%BITCHUNK_BITS))04837#defineGET_BIT(map,bit)(MAP_CHUNK(map,bit)&(1p_reg.
psw=(rp)->p_reg.
psw&0xCD5|(new)&0xCD5)04855#defineIF_MASK0x0000020004856#defineIOPL_MASK0x0030000485704858/*Disable/enablehardwareinterrupts.
Theparametersoflock()andunlock()04859*areusedwhendebuggingisenabled.
Seedebug.
hformoreinformation.
04860*/04861#definelock(c,v)intr_disable();04862#defineunlock(c)intr_enable();0486304864/*Sizesofmemorytables.
Thebootmonitordistinguishesthreememoryareas,04865*namelylowmembelow1M,1M-16M,andmemafter16M.
Morechunksareneeded04866*forDOSMINIX.
04867*/04868#defineNR_MEMS80486904870#endif/*CONST_H*/0487104872048730487404875kernel/type.
h04900#ifndefTYPE_H04901#defineTYPE_H0490204903typedef_PROTOTYPE(voidtask_t,(void));0490404905/*Processtableandsystempropertyrelatedtypes.
*/04906typedefintproc_nr_t;/*processtableentrynumber*/04907typedefshortsys_id_t;/*systemprocessindex*/04908typedefstruct{/*bitmapforsystemindexes*/04909bitchunk_tchunk[BITMAP_CHUNKS(NR_SYS_PROCS)];04910}sys_map_t;0491104912structboot_image{04913proc_nr_tproc_nr;/*processnumbertouse*/04914task_t*initial_pc;/*startfunctionfortasks*/MINIXSOURCECODEFile:kernel/type.
h55504915intflags;/*processflags*/04916unsignedcharquantum;/*quantum(tickcount)*/04917intpriority;/*schedulingpriority*/04918intstksize;/*stacksizefortasks*/04919shorttrap_mask;/*allowedsystemcalltraps*/04920bitchunk_tipc_to;/*sendmaskprotection*/04921longcall_mask;/*systemcallprotection*/04922charproc_name[P_NAME_LEN];/*nameinprocesstable*/04923};0492404925structmemory{04926phys_clicksbase;/*startaddressofchunk*/04927phys_clickssize;/*sizeofmemorychunk*/04928};0492904930/*Thekerneloutputsdiagnosticmessagesinacircularbuffer.
*/04931structkmessages{04932intkm_next;/*nextindextowrite*/04933intkm_size;/*currentsizeinbuffer*/04934charkm_buf[KMESS_BUF_SIZE];/*bufferformessages*/04935};0493604937structrandomness{04938struct{04939intr_next;/*nextindextowrite*/04940intr_size;/*numberofrandomelements*/04941unsignedshortr_buf[RANDOM_ELEMENTS];/*bufferforrandominfo*/04942}bin[RANDOM_SOURCES];04943};0494404945#if(CHIP==INTEL)04946typedefunsignedreg_t;/*machineregister*/0494704948/*Thestackframelayoutisdeterminedbythesoftware,butforefficiency04949*itislaidoutsotheassemblycodetouseitisassimpleaspossible.
04950*80286protectedmodeandallrealmodesusethesameframe,builtwith04951*16-bitregisters.
Realmodelacksanautomaticstackswitch,solittle04952*islostbyusingthe286frameforit.
The386framediffersonlyin04953*having32-bitregistersandmoresegmentregisters.
Thesamenamesare04954*usedforthelargerregisterstoavoiddifferencesinthecode.
04955*/04956structstackframe_s{/*proc_ptrpointshere*/04957#if_WORD_SIZE==404958u16_tgs;/*lastitempushedbysave*/04959u16_tfs;04960#endif04961u16_tes;04962u16_tds;04963reg_tdi;/*dithroughcxarenotaccessedinC*/04964reg_tsi;/*orderistomatchpusha/popa*/04965reg_tfp;/*bp*/04966reg_tst;/*holeforanothercopyofsp*/04967reg_tbx;04968reg_tdx;04969reg_tcx;04970reg_tretreg;/*axandaboveareallpushedbysave*/04971reg_tretadr;/*returnaddressforassemblycodesave()*/04972reg_tpc;/*lastitempushedbyinterrupt*/04973reg_tcs;04974reg_tpsw;556File:kernel/type.
hMINIXSOURCECODE04975reg_tsp;04976reg_tss;/*thesearepushedbyCPUduringinterrupt*/04977};0497804979structsegdesc_s{/*segmentdescriptorforprotectedmode*/04980u16_tlimit_low;04981u16_tbase_low;04982u8_tbase_middle;04983u8_taccess;/*|P|DL|1|X|E|R|A|*/04984u8_tgranularity;/*|G|X|0|A|LIMT|*/04985u8_tbase_high;04986};0498704988typedefunsignedlongirq_policy_t;04989typedefunsignedlongirq_id_t;0499004991typedefstructirq_hook{04992structirq_hook*next;/*nexthookinchain*/04993int(*handler)(structirq_hook*);/*interrupthandler*/04994intirq;/*IRQvectornumber*/04995intid;/*idofthishook*/04996intproc_nr;/*NONEifnotinuse*/04997irq_id_tnotify_id;/*idtoreturnoninterrupt*/04998irq_policy_tpolicy;/*bitmaskforpolicy*/04999}irq_hook_t;0500005001typedefint(*irq_handler_t)(structirq_hook*);0500205003#endif/*(CHIP==INTEL)*/0500405005#if(CHIP==M68000)05006/*M68000specifictypesgohere.
*/05007#endif/*(CHIP==M68000)*/0500805009#endif/*TYPE_H*/kernel/proto.
h05100/*Functionprototypes.
*/0510105102#ifndefPROTO_H05103#definePROTO_H0510405105/*Structdeclarations.
*/05106structproc;05107structtimer;0510805109/*clock.
c*/05110_PROTOTYPE(voidclock_task,(void));05111_PROTOTYPE(voidclock_stop,(void));05112_PROTOTYPE(clock_tget_uptime,(void));05113_PROTOTYPE(unsignedlongread_clock,(void));05114_PROTOTYPE(voidset_timer,(structtimer*tp,clock_tt,tmr_func_tf));05115_PROTOTYPE(voidreset_timer,(structtimer*tp));0511605117/*main.
c*/05118_PROTOTYPE(voidmain,(void));05119_PROTOTYPE(voidprepare_shutdown,(inthow));MINIXSOURCECODEFile:kernel/proto.
h5570512005121/*utility.
c*/05122_PROTOTYPE(voidkprintf,(constchar*fmt,05123_PROTOTYPE(voidpanic,(_CONSTchar*s,intn));0512405125/*proc.
c*/05126_PROTOTYPE(intsys_call,(intfunction,intsrc_dest,message*m_ptr));05127_PROTOTYPE(intlock_notify,(intsrc,intdst));05128_PROTOTYPE(intlock_send,(intdst,message*m_ptr));05129_PROTOTYPE(voidlock_enqueue,(structproc*rp));05130_PROTOTYPE(voidlock_dequeue,(structproc*rp));0513105132/*start.
c*/05133_PROTOTYPE(voidcstart,(U16_tcs,U16_tds,U16_tmds,05134U16_tparmoff,U16_tparmsize));0513505136/*system.
c*/05137_PROTOTYPE(intget_priv,(registerstructproc*rc,intproc_type));05138_PROTOTYPE(voidsend_sig,(intproc_nr,intsig_nr));05139_PROTOTYPE(voidcause_sig,(intproc_nr,intsig_nr));05140_PROTOTYPE(voidsys_task,(void));05141_PROTOTYPE(voidget_randomness,(intsource));05142_PROTOTYPE(intvirtual_copy,(structvir_addr*src,structvir_addr*dst,05143vir_bytesbytes));05144#definenumap_local(proc_nr,vir_addr,bytes)\05145umap_local(proc_addr(proc_nr),D,(vir_addr),(bytes))05146_PROTOTYPE(phys_bytesumap_local,(structproc*rp,intseg,05147vir_bytesvir_addr,vir_bytesbytes));05148_PROTOTYPE(phys_bytesumap_remote,(structproc*rp,intseg,05149vir_bytesvir_addr,vir_bytesbytes));05150_PROTOTYPE(phys_bytesumap_bios,(structproc*rp,vir_bytesvir_addr,05151vir_bytesbytes));0515205153/*exception.
c*/05154_PROTOTYPE(voidexception,(unsignedvec_nr));0515505156/*i8259.
c*/05157_PROTOTYPE(voidintr_init,(intmine));05158_PROTOTYPE(voidintr_handle,(irq_hook_t*hook));05159_PROTOTYPE(voidput_irq_handler,(irq_hook_t*hook,intirq,05160irq_handler_thandler));05161_PROTOTYPE(voidrm_irq_handler,(irq_hook_t*hook));0516205163/*klib*.
s*/05164_PROTOTYPE(voidint86,(void));05165_PROTOTYPE(voidcp_mess,(intsrc,phys_clickssrc_clicks,vir_bytessrc_offset,05166phys_clicksdst_clicks,vir_bytesdst_offset));05167_PROTOTYPE(voidenable_irq,(irq_hook_t*hook));05168_PROTOTYPE(intdisable_irq,(irq_hook_t*hook));05169_PROTOTYPE(u16_tmem_rdw,(U16_tsegm,vir_bytesoffset));05170_PROTOTYPE(voidphys_copy,(phys_bytessource,phys_bytesdest,05171phys_bytescount));05172_PROTOTYPE(voidphys_memset,(phys_bytessource,unsignedlongpattern,05173phys_bytescount));05174_PROTOTYPE(voidphys_insb,(U16_tport,phys_bytesbuf,size_tcount));05175_PROTOTYPE(voidphys_insw,(U16_tport,phys_bytesbuf,size_tcount));05176_PROTOTYPE(voidphys_outsb,(U16_tport,phys_bytesbuf,size_tcount));05177_PROTOTYPE(voidphys_outsw,(U16_tport,phys_bytesbuf,size_tcount));05178_PROTOTYPE(voidreset,(void));05179_PROTOTYPE(voidlevel0,(void(*func)(void)));558File:kernel/proto.
hMINIXSOURCECODE05180_PROTOTYPE(voidmonitor,(void));05181_PROTOTYPE(voidread_tsc,(unsignedlong*high,unsignedlong*low));05182_PROTOTYPE(unsignedlongread_cpu_flags,(void));0518305184/*mpx*.
s*/05185_PROTOTYPE(voididle_task,(void));05186_PROTOTYPE(voidrestart,(void));0518705188/*ThefollowingarenevercalledfromC(pureasmprocs).
*/0518905190/*Exceptionhandlers(realorprotectedmode),innumericalorder.
*/05191void_PROTOTYPE(int00,(void)),_PROTOTYPE(divide_error,(void));05192void_PROTOTYPE(int01,(void)),_PROTOTYPE(single_step_exception,(void));05193void_PROTOTYPE(int02,(void)),_PROTOTYPE(nmi,(void));05194void_PROTOTYPE(int03,(void)),_PROTOTYPE(breakpoint_exception,(void));05195void_PROTOTYPE(int04,(void)),_PROTOTYPE(overflow,(void));05196void_PROTOTYPE(int05,(void)),_PROTOTYPE(bounds_check,(void));05197void_PROTOTYPE(int06,(void)),_PROTOTYPE(inval_opcode,(void));05198void_PROTOTYPE(int07,(void)),_PROTOTYPE(copr_not_available,(void));05199void_PROTOTYPE(double_fault,(void));05200void_PROTOTYPE(copr_seg_overrun,(void));05201void_PROTOTYPE(inval_tss,(void));05202void_PROTOTYPE(segment_not_present,(void));05203void_PROTOTYPE(stack_exception,(void));05204void_PROTOTYPE(general_protection,(void));05205void_PROTOTYPE(page_fault,(void));05206void_PROTOTYPE(copr_error,(void));0520705208/*Hardwareinterrupthandlers.
*/05209_PROTOTYPE(voidhwint00,(void));05210_PROTOTYPE(voidhwint01,(void));05211_PROTOTYPE(voidhwint02,(void));05212_PROTOTYPE(voidhwint03,(void));05213_PROTOTYPE(voidhwint04,(void));05214_PROTOTYPE(voidhwint05,(void));05215_PROTOTYPE(voidhwint06,(void));05216_PROTOTYPE(voidhwint07,(void));05217_PROTOTYPE(voidhwint08,(void));05218_PROTOTYPE(voidhwint09,(void));05219_PROTOTYPE(voidhwint10,(void));05220_PROTOTYPE(voidhwint11,(void));05221_PROTOTYPE(voidhwint12,(void));05222_PROTOTYPE(voidhwint13,(void));05223_PROTOTYPE(voidhwint14,(void));05224_PROTOTYPE(voidhwint15,(void));0522505226/*Softwareinterrupthandlers,innumericalorder.
*/05227_PROTOTYPE(voidtrp,(void));05228_PROTOTYPE(voids_call,(void)),_PROTOTYPE(p_s_call,(void));05229_PROTOTYPE(voidlevel0_call,(void));0523005231/*protect.
c*/05232_PROTOTYPE(voidprot_init,(void));05233_PROTOTYPE(voidinit_codeseg,(structsegdesc_s*segdp,phys_bytesbase,05234vir_bytessize,intprivilege));05235_PROTOTYPE(voidinit_dataseg,(structsegdesc_s*segdp,phys_bytesbase,05236vir_bytessize,intprivilege));05237_PROTOTYPE(phys_bytesseg2phys,(U16_tseg));05238_PROTOTYPE(voidphys2seg,(u16_t*seg,vir_bytes*off,phys_bytesphys));05239_PROTOTYPE(voidenable_iop,(structproc*pp));MINIXSOURCECODEFile:kernel/proto.
h55905240_PROTOTYPE(voidalloc_segments,(structproc*rp));0524105242#endif/*PROTO_H*/0524305244kernel/glo.
h05300#ifndefGLO_H05301#defineGLO_H0530205303/*Globalvariablesusedinthekernel.
Thisfilecontainsthedeclarations;05304*storagespaceforthevariablesisallocatedintable.
c,becauseEXTERNis05305*definedasexternunlessthe_TABLEdefinitionisseen.
Werelyonthe05306*compiler'sdefaultinitialization(0)forseveralglobalvariables.
05307*/05308#ifdef_TABLE05309#undefEXTERN05310#defineEXTERN05311#endif0531205313#include05314#include"config.
h"0531505316/*VariablesrelatingtoshuttingdownMINIX.
*/05317EXTERNcharkernel_exception;/*TRUEaftersystemexceptions*/05318EXTERNcharshutdown_started;/*TRUEaftershutdowns/reboots*/0531905320/*Kernelinformationstructures.
Thisgroupsvitalkernelinformation.
*/05321EXTERNphys_bytesaout;/*addressofa.
outheaders*/05322EXTERNstructkinfokinfo;/*kernelinformationforusers*/05323EXTERNstructmachinemachine;/*machineinformationforusers*/05324EXTERNstructkmessageskmess;/*diagnosticmessagesinkernel*/05325EXTERNstructrandomnesskrandom;/*gatherkernelrandominformation*/0532605327/*Processschedulinginformationandthekernelreentrycount.
*/05328EXTERNstructproc*prev_ptr;/*previouslyrunningprocess*/05329EXTERNstructproc*proc_ptr;/*pointertocurrentlyrunningprocess*/05330EXTERNstructproc*next_ptr;/*nextprocesstorunafterrestart()*/05331EXTERNstructproc*bill_ptr;/*processtobillforclockticks*/05332EXTERNchark_reenter;/*kernelreentrycount(entrycountless1)*/05333EXTERNunsignedlost_ticks;/*clocktickscountedoutsideclocktask*/0533405335/*Interruptrelatedvariables.
*/05336EXTERNirq_hook_tirq_hooks[NR_IRQ_HOOKS];/*hooksforgeneraluse*/05337EXTERNirq_hook_t*irq_handlers[NR_IRQ_VECTORS];/*listofIRQhandlers*/05338EXTERNintirq_actids[NR_IRQ_VECTORS];/*IRQIDbitsactive*/05339EXTERNintirq_use;/*mapofallin-useirq's*/0534005341/*Miscellaneous.
*/05342EXTERNreg_tmon_ss,mon_sp;/*bootmonitorstack*/05343EXTERNintmon_return;/*trueifwecanreturntomonitor*/0534405345/*Variablesthatareinitializedelsewherearejustexternhere.
*/05346externstructboot_imageimage[];/*systemimageprocesses*/05347externchar*t_stack[];/*taskstackspace*/05348externstructsegdesc_sgdt[];/*globaldescriptortable*/05349560File:kernel/glo.
hMINIXSOURCECODE05350EXTERN_PROTOTYPE(void(*level0_func),(void));0535105352#endif/*GLO_H*/0535305354053550535605357kernel/ipc.
h05400#ifndefIPC_H05401#defineIPC_H0540205403/*ThisheaderfiledefinesconstantsforMINIXinter-processcommunication.
05404*Thesedefinitionsareusedinthefileproc.
c.
05405*/05406#include0540705408/*Masksandflagsforsystemcalls.
*/05409#defineSYSCALL_FUNC0x0F/*maskforsystemcallfunction*/05410#defineSYSCALL_FLAGS0xF0/*maskforsystemcallflags*/05411#defineNON_BLOCKING0x10/*preventblocking,returnerror*/0541205413/*Systemcallnumbersthatarepassedwhentrappingtothekernel.
The05414*numbersarecarefullydefinedsothatitcaneasilybeseen(basedon05415*thebitsthatareon)whichchecksshouldbedoneinsys_call().
05416*/05417#defineSEND1/*0001:blockingsend*/05418#defineRECEIVE2/*0010:blockingreceive*/05419#defineSENDREC3/*0011:SEND+RECEIVE*/05420#defineNOTIFY4/*0100:nonblockingnotify*/05421#defineECHO8/*1000:echoamessage*/0542205423/*Thefollowingbitmasksdeterminewhatchecksthatshouldbedone.
*/05424#defineCHECK_PTR0x0B/*1011:validatemessagebuffer*/05425#defineCHECK_DST0x05/*0101:validatemessagedestination*/05426#defineCHECK_SRC0x02/*0010:validatemessagesource*/0542705428#endif/*IPC_H*/kernel/proc.
h05500#ifndefPROC_H05501#definePROC_H0550205503/*Hereisthedeclarationoftheprocesstable.
Itcontainsallprocess05504*data,includingregisters,flags,schedulingpriority,memorymap,05505*accounting,messagepassing(IPC)information,andsoon.
05506*05507*Manyassemblycoderoutinesreferencefieldsinit.
Theoffsetstothese05508*fieldsaredefinedintheassemblerincludefilesconst.
h.
Whenchanging05509*structproc,besuretochangesconst.
htomatch.
MINIXSOURCECODEFile:kernel/proc.
h56105510*/05511#include05512#include"protect.
h"05513#include"const.
h"05514#include"priv.
h"0551505516structproc{05517structstackframe_sp_reg;/*process'registerssavedinstackframe*/05518reg_tp_ldt_sel;/*selectoringdtwithldtbaseandlimit*/05519structsegdesc_sp_ldt[2+NR_REMOTE_SEGS];/*CS,DSandremotesegments*/0552005521proc_nr_tp_nr;/*numberofthisprocess(forfastaccess)*/05522structpriv*p_priv;/*systemprivilegesstructure*/05523charp_rts_flags;/*SENDING,RECEIVING,etc.
*/0552405525charp_priority;/*currentschedulingpriority*/05526charp_max_priority;/*maximumschedulingpriority*/05527charp_ticks_left;/*numberofschedulingticksleft*/05528charp_quantum_size;/*quantumsizeinticks*/0552905530structmem_mapp_memmap[NR_LOCAL_SEGS];/*memorymap(T,D,S)*/0553105532clock_tp_user_time;/*usertimeinticks*/05533clock_tp_sys_time;/*systimeinticks*/0553405535structproc*p_nextready;/*pointertonextreadyprocess*/05536structproc*p_caller_q;/*headoflistofprocswishingtosend*/05537structproc*p_q_link;/*linktonextprocwishingtosend*/05538message*p_messbuf;/*pointertopassedmessagebuffer*/05539proc_nr_tp_getfrom;/*fromwhomdoesprocesswanttoreceive*/05540proc_nr_tp_sendto;/*towhomdoesprocesswanttosend*/0554105542sigset_tp_pending;/*bitmapforpendingkernelsignals*/0554305544charp_name[P_NAME_LEN];/*nameoftheprocess,including\0*/05545};0554605547/*Bitsfortheruntimeflags.
Aprocessisrunnableiffp_rts_flags==0.
*/05548#defineSLOT_FREE0x01/*processslotisfree*/05549#defineNO_MAP0x02/*keepsunmappedforkedchildfromrunning*/05550#defineSENDING0x04/*processblockedtryingtoSEND*/05551#defineRECEIVING0x08/*processblockedtryingtoRECEIVE*/05552#defineSIGNALED0x10/*setwhennewkernelsignalarrives*/05553#defineSIG_PENDING0x20/*unreadywhilesignalbeingprocessed*/05554#defineP_STOP0x40/*setwhenprocessisbeingtraced*/05555#defineNO_PRIV0x80/*keepforkedsystemprocessfromrunning*/0555605557/*Schedulingprioritiesforp_priority.
Valuesmuststartatzero(highest05558*priority)andincrement.
Prioritiesoftheprocessesinthebootimage05559*canbesetintable.
c.
IDLEmusthaveaqueueforitself,topreventlow05560*priorityuserprocessestorunround-robinwithIDLE.
05561*/05562#defineNR_SCHED_QUEUES16/*MUSTequalminimumpriority+1*/05563#defineTASK_Q0/*highest,usedforkerneltasks*/05564#defineMAX_USER_Q0/*highestpriorityforuserprocesses*/05565#defineUSER_Q7/*default(shouldcorrespondtonice0)*/05566#defineMIN_USER_Q14/*minimumpriorityforuserprocesses*/05567#defineIDLE_Q15/*lowest,onlyIDLEprocessgoeshere*/0556805569/*Magicprocesstableaddresses.
*/562File:kernel/proc.
hMINIXSOURCECODE05570#defineBEG_PROC_ADDR(&proc[0])05571#defineBEG_USER_ADDR(&proc[NR_TASKS])05572#defineEND_PROC_ADDR(&proc[NR_TASKS+NR_PROCS])0557305574#defineNIL_PROC((structproc*)0)05575#defineNIL_SYS_PROC((structproc*)1)05576#definecproc_addr(n)(&(proc+NR_TASKS)[(n)])05577#defineproc_addr(n)(pproc_addr+NR_TASKS)[(n)]05578#defineproc_nr(p)((p)->p_nr)0557905580#defineisokprocn(n)((unsigned)((n)+NR_TASKS)p_rts_flags==SLOT_FREE)05583#defineiskernelp(p)iskerneln((p)->p_nr)05584#defineiskerneln(n)((n)p_nr)05586#defineisusern(n)((n)>=0)0558705588/*Theprocesstableandpointerstoprocesstableslots.
Thepointersallow05589*fasteraccessbecausenowaprocessentrycanbefoundbyindexingthe05590*pproc_addrarray,whileaccessinganelementirequiresamultiplication05591*withsizeof(structproc)todeterminetheaddress.
05592*/05593EXTERNstructprocproc[NR_TASKS+NR_PROCS];/*processtable*/05594EXTERNstructproc*pproc_addr[NR_TASKS+NR_PROCS];05595EXTERNstructproc*rdy_head[NR_SCHED_QUEUES];/*ptrstoreadylistheaders*/05596EXTERNstructproc*rdy_tail[NR_SCHED_QUEUES];/*ptrstoreadylisttails*/0559705598#endif/*PROC_H*/kernel/sconst.
h05600!
Miscellaneousconstantsusedinassemblercode.
05601W=_WORD_SIZE!
Machinewordsize.
0560205603!
Offsetsinstructproc.
TheyMUSTmatchproc.
h.
05604P_STACKBASE=005605GSREG=P_STACKBASE05606FSREG=GSREG+2!
386introducesFSandGSsegments05607ESREG=FSREG+205608DSREG=ESREG+205609DIREG=DSREG+205610SIREG=DIREG+W05611BPREG=SIREG+W05612STREG=BPREG+W!
holeforanotherSP05613BXREG=STREG+W05614DXREG=BXREG+W05615CXREG=DXREG+W05616AXREG=CXREG+W05617RETADR=AXREG+W!
returnaddressforsave()call05618PCREG=RETADR+W05619CSREG=PCREG+W05620PSWREG=CSREG+W05621SPREG=PSWREG+W05622SSREG=SPREG+W05623P_STACKTOP=SSREG+W05624P_LDT_SEL=P_STACKTOPMINIXSOURCECODEFile:kernel/sconst.
h56305625P_LDT=P_LDT_SEL+W0562605627Msize=9!
sizeofamessagein32-bitwordskernel/priv.
h05700#ifndefPRIV_H05701#definePRIV_H0570205703/*Declarationofthesystemprivilegesstructure.
Itdefinesflags,system05704*callmasks,ansynchronousalarmtimer,I/Oprivileges,pendinghardware05705*interruptsandnotifications,andsoon.
05706*Systemprocesseseachgettheirownstructurewithproperties,whereasall05707*userprocessesshareonestructure.
Thissetupprovidesaclearseparation05708*betweencommonandprivilegedprocessfieldsandisveryspaceefficient.
05709*05710*Changes:05711*Jul01,2005Created.
(JorritN.
Herder)05712*/05713#include05714#include"protect.
h"05715#include"const.
h"05716#include"type.
h"0571705718structpriv{05719proc_nr_ts_proc_nr;/*numberofassociatedprocess*/05720sys_id_ts_id;/*indexofthissystemstructure*/05721shorts_flags;/*PREEMTIBLE,BILLABLE,etc.
*/0572205723shorts_trap_mask;/*allowedsystemcalltraps*/05724sys_map_ts_ipc_from;/*allowedcallerstoreceivefrom*/05725sys_map_ts_ipc_to;/*alloweddestinationprocesses*/05726longs_call_mask;/*allowedkernelcalls*/0572705728sys_map_ts_notify_pending;/*bitmapwithpendingnotifications*/05729irq_id_ts_int_pending;/*pendinghardwareinterrupts*/05730sigset_ts_sig_pending;/*pendingsignals*/0573105732timer_ts_alarm_timer;/*synchronousalarmtimer*/05733structfar_mems_farmem[NR_REMOTE_SEGS];/*remotememorymap*/05734reg_t*s_stack_guard;/*stackguardwordforkerneltasks*/05735};0573605737/*Guardwordfortaskstacks.
*/05738#defineSTACK_GUARD((reg_t)(sizeof(reg_t)==20xBEEF:0xDEADBEEF))0573905740/*Bitsforthesystempropertyflags.
*/05741#definePREEMPTIBLE0x01/*kerneltasksarenotpreemptible*/05742#defineBILLABLE0x04/*someprocessesarenotbillable*/05743#defineSYS_PROC0x10/*systemprocessesareprivileged*/05744#defineSENDREC_BUSY0x20/*sendrec()inprogress*/0574505746/*Magicsystemstructuretableaddresses.
*/05747#defineBEG_PRIV_ADDR(&priv[0])05748#defineEND_PRIV_ADDR(&priv[NR_SYS_PROCS])05749564File:kernel/priv.
hMINIXSOURCECODE05750#definepriv_addr(i)(ppriv_addr)[(i)]05751#definepriv_id(rp)((rp)->p_priv->s_id)05752#definepriv(rp)((rp)->p_priv)0575305754#defineid_to_nr(id)priv_addr(id)->s_proc_nr05755#definenr_to_id(nr)priv(proc_addr(nr))->s_id0575605757/*Thesystemstructurestableandpointerstoindividualtableslots.
The05758*pointersallowfasteraccessbecausenowaprocessentrycanbefoundby05759*indexingthepsys_addrarray,whileaccessinganelementirequiresa05760*multiplicationwithsizeof(structsys)todeterminetheaddress.
05761*/05762EXTERNstructprivpriv[NR_SYS_PROCS];/*systempropertiestable*/05763EXTERNstructpriv*ppriv_addr[NR_SYS_PROCS];/*directslotpointers*/0576405765/*Unprivilegeduserprocessesallsharethesameprivilegestructure.
05766*Thisidmustbefixedbecauseitisusedtochecksendmaskentries.
05767*/05768#defineUSER_PRIV_ID00576905770/*Makesurethesystemcanboot.
Thefollowingsanitycheckverifiesthat05771*thesystemprivilegestableislargeenoughforthenumberofprocesses05772*inthebootimage.
05773*/05774#if(NR_BOOT_PROCS>NR_SYS_PROCS)05775#errorNR_SYS_PROCSmustbelargerthanNR_BOOT_PROCS05776#endif0577705778#endif/*PRIV_H*/kernel/protect.
h05800/*Constantsforprotectedmode.
*/0580105802/*Tablesizes.
*/05803#defineGDT_SIZE(FIRST_LDT_INDEX+NR_TASKS+NR_PROCS)05804/*spec.
andLDT's*/05805#defineIDT_SIZE(IRQ8_VECTOR+8)/*onlyuptothehighestvector*/05806#defineLDT_SIZE(2+NR_REMOTE_SEGS)/*CS,DSandremotesegments*/0580705808/*Fixedglobaldescriptors.
1to7areprescribedbytheBIOS.
*/05809#defineGDT_INDEX1/*GDTdescriptor*/05810#defineIDT_INDEX2/*IDTdescriptor*/05811#defineDS_INDEX3/*kernelDS*/05812#defineES_INDEX4/*kernelES(386:flag4Gbatstartup)*/05813#defineSS_INDEX5/*kernelSS(386:monitorSSatstartup)*/05814#defineCS_INDEX6/*kernelCS*/05815#defineMON_CS_INDEX7/*tempforBIOS(386:monitorCSatstartup)*/05816#defineTSS_INDEX8/*kernelTSS*/05817#defineDS_286_INDEX9/*scratch16-bitsourcesegment*/05818#defineES_286_INDEX10/*scratch16-bitdestinationsegment*/05819#defineA_INDEX11/*64KmemorysegmentatA0000*/05820#defineB_INDEX12/*64KmemorysegmentatB0000*/05821#defineC_INDEX13/*64KmemorysegmentatC0000*/05822#defineD_INDEX14/*64KmemorysegmentatD0000*/05823#defineFIRST_LDT_INDEX15/*restofdescriptorsareLDT's*/05824MINIXSOURCECODEFile:kernel/protect.
h56505825#defineGDT_SELECTOR0x08/*(GDT_INDEX*DESC_SIZE)badforasld*/05826#defineIDT_SELECTOR0x10/*(IDT_INDEX*DESC_SIZE)*/05827#defineDS_SELECTOR0x18/*(DS_INDEX*DESC_SIZE)*/05828#defineES_SELECTOR0x20/*(ES_INDEX*DESC_SIZE)*/05829#defineFLAT_DS_SELECTOR0x21/*lessprivilegedES*/05830#defineSS_SELECTOR0x28/*(SS_INDEX*DESC_SIZE)*/05831#defineCS_SELECTOR0x30/*(CS_INDEX*DESC_SIZE)*/05832#defineMON_CS_SELECTOR0x38/*(MON_CS_INDEX*DESC_SIZE)*/05833#defineTSS_SELECTOR0x40/*(TSS_INDEX*DESC_SIZE)*/05834#defineDS_286_SELECTOR0x49/*(DS_286_INDEX*DESC_SIZE+TASK_PRIVILEGE)*/05835#defineES_286_SELECTOR0x51/*(ES_286_INDEX*DESC_SIZE+TASK_PRIVILEGE)*/0583605837/*Fixedlocaldescriptors.
*/05838#defineCS_LDT_INDEX0/*processCS*/05839#defineDS_LDT_INDEX1/*processDS=ES=FS=GS=SS*/05840#defineEXTRA_LDT_INDEX2/*firstoftheextraLDTentries*/0584105842/*Privileges.
*/05843#defineINTR_PRIVILEGE0/*kernelandinterrupthandlers*/05844#defineTASK_PRIVILEGE1/*kerneltasks*/05845#defineUSER_PRIVILEGE3/*serversanduserprocesses*/0584605847/*286hardwareconstants.
*/0584805849/*Exceptionvectornumbers.
*/05850#defineBOUNDS_VECTOR5/*boundscheckfailed*/05851#defineINVAL_OP_VECTOR6/*invalidopcode*/05852#defineCOPROC_NOT_VECTOR7/*coprocessornotavailable*/05853#defineDOUBLE_FAULT_VECTOR805854#defineCOPROC_SEG_VECTOR9/*coprocessorsegmentoverrun*/05855#defineINVAL_TSS_VECTOR10/*invalidTSS*/05856#defineSEG_NOT_VECTOR11/*segmentnotpresent*/05857#defineSTACK_FAULT_VECTOR12/*stackexception*/05858#definePROTECTION_VECTOR13/*generalprotection*/0585905860/*Selectorbits.
*/05861#defineTI0x04/*tableindicator*/05862#defineRPL0x03/*requesterprivilegelevel*/0586305864/*Descriptorstructureoffsets.
*/05865#defineDESC_BASE2/*tobase_low*/05866#defineDESC_BASE_MIDDLE4/*tobase_middle*/05867#defineDESC_ACCESS5/*toaccessbyte*/05868#defineDESC_SIZE8/*sizeof(structsegdesc_s)*/0586905870/*Baseandlimitsizesandshifts.
*/05871#defineBASE_MIDDLE_SHIFT16/*shiftforbase-->base_middle*/0587205873/*Access-byteandtype-bytebits.
*/05874#definePRESENT0x80/*setfordescriptorpresent*/05875#defineDPL0x60/*descriptorprivilegelevelmask*/05876#defineDPL_SHIFT505877#defineSEGMENT0x10/*setforsegment-typedescriptors*/0587805879/*Access-bytebits.
*/05880#defineEXECUTABLE0x08/*setforexecutablesegment*/05881#defineCONFORMING0x04/*setforconformingsegmentifexecutable*/05882#defineEXPAND_DOWN0x04/*setforexpand-downsegmentif!
executable*/05883#defineREADABLE0x02/*setforreadablesegmentifexecutable*/05884#defineWRITEABLE0x02/*setforwriteablesegmentif!
executable*/566File:kernel/protect.
hMINIXSOURCECODE05885#defineTSS_BUSY0x02/*setifTSSdescriptorisbusy*/05886#defineACCESSED0x01/*setifsegmentaccessed*/0588705888/*Specialdescriptortypes.
*/05889#defineAVL_286_TSS1/*available286TSS*/05890#defineLDT2/*localdescriptortable*/05891#defineBUSY_286_TSS3/*settransparentlytothesoftware*/05892#defineCALL_286_GATE4/*notused*/05893#defineTASK_GATE5/*onlyusedbydebugger*/05894#defineINT_286_GATE6/*interruptgate,usedforallvectors*/05895#defineTRAP_286_GATE7/*notused*/0589605897/*Extra386hardwareconstants.
*/0589805899/*Exceptionvectornumbers.
*/05900#definePAGE_FAULT_VECTOR1405901#defineCOPROC_ERR_VECTOR16/*coprocessorerror*/0590205903/*Descriptorstructureoffsets.
*/05904#defineDESC_GRANULARITY6/*togranularitybyte*/05905#defineDESC_BASE_HIGH7/*tobase_high*/0590605907/*Baseandlimitsizesandshifts.
*/05908#defineBASE_HIGH_SHIFT24/*shiftforbase-->base_high*/05909#defineBYTE_GRAN_MAX0xFFFFFL/*maximumsizeforbytegranularsegment*/05910#defineGRANULARITY_SHIFT16/*shiftforlimit-->granularity*/05911#defineOFFSET_HIGH_SHIFT16/*shiftfor(gate)offset-->offset_high*/05912#definePAGE_GRAN_SHIFT12/*extrashiftforpagegranularlimits*/0591305914/*Type-bytebits.
*/05915#defineDESC_386_BIT0x08/*386typesareobtainedbyORingwiththis*/05916/*LDT'sandTASK_GATE'sdon'tneedit*/0591705918/*Granularitybyte.
*/05919#defineGRANULAR0x80/*setfor4Kgranularilty*/05920#defineDEFAULT0x40/*setfor32-bitdefaults(executableseg)*/05921#defineBIG0x40/*setfor"BIG"(expand-downseg)*/05922#defineAVL0x10/*0foravailable*/05923#defineLIMIT_HIGH0x0F/*maskforhighbitsoflimit*/kernel/table.
c06000/*Theobjectfileof"table.
c"containsmostkerneldata.
Variablesthat06001*aredeclaredinthe*.
hfilesappearwithEXTERNinfrontofthem,asin06002*06003*EXTERNintx;06004*06005*NormallyEXTERNisdefinedasextern,sowhentheyareincludedinanother06006*file,nostorageisallocated.
IfEXTERNwerenotpresent,butjustsay,06007*06008*intx;06009*06010*thenincludingthisfileinseveralsourcefileswouldcause'x'tobe06011*declaredseveraltimes.
Whilesomelinkersacceptthis,othersdonot,06012*sotheyaredeclaredexternwhenincludednormally.
However,itmustbe06013*declaredforrealsomewhere.
Thatisdonehere,byredefiningEXTERNas06014*thenullstring,sothatinclusionofall*.
hfilesintable.
cactuallyMINIXSOURCECODEFile:kernel/table.
c56706015*generatesstorageforthem.
06016*06017*VariousvariablescouldnotbedeclaredEXTERN,butaredeclaredPUBLIC06018*orPRIVATE.
Thereasonforthisisthatexternvariablescannothavea06019*defaultinitialization.
Ifsuchvariablesareshared,theymustalsobe06020*declaredinoneofthe*.
hfileswithouttheinitialization.
Examples06021*include'boot_image'(thisfile)and'idt'and'gdt'(protect.
c).
06022*06023*Changes:06024*Aug02,2005setprivilegesandminimalbootimage(JorritN.
Herder)06025*Oct17,2004updatedaboveandtasktabcomments(JorritN.
Herder)06026*May01,2004changedstructforsystemimage(JorritN.
Herder)06027*/06028#define_TABLE0602906030#include"kernel.
h"06031#include"proc.
h"06032#include"ipc.
h"06033#include06034#include0603506036/*Definestacksizesforthekerneltasksincludedinthesystemimage.
*/06037#defineNO_STACK006038#defineSMALL_STACK(128*sizeof(char*))06039#defineIDL_SSMALL_STACK/*3intr,3temps,4dbforIntel*/06040#defineHRD_SNO_STACK/*dummytask,useskernelstack*/06041#defineTSK_SSMALL_STACK/*systemandclocktask*/0604206043/*Stackspaceforallthetaskstacks.
Declaredas(char*)toalignit.
*/06044#defineTOT_STACK_SPACE(IDL_S+HRD_S+(2*TSK_S))06045PUBLICchar*t_stack[TOT_STACK_SPACE/sizeof(char*)];0604606047/*Defineflagsforthevariousprocesstypes.
*/06048#defineIDL_F(SYS_PROC|PREEMPTIBLE|BILLABLE)/*idletask*/06049#defineTSK_F(SYS_PROC)/*kerneltasks*/06050#defineSRV_F(SYS_PROC|PREEMPTIBLE)/*systemservices*/06051#defineUSR_F(BILLABLE|PREEMPTIBLE)/*userprocesses*/0605206053/*Definesystemcalltrapsforthevariousprocesstypes.
Thesecallmasks06054*determinewhatsystemcalltrapsaprocessisallowedtomake.
06055*/06056#defineTSK_T(1ccessrightsonapercallbasis.
568File:kernel/table.
cMINIXSOURCECODE06075*Notethatthereincarnationserverhasallbitson,becauseitshould06076*beallowedtodistributerightstoservicesthatitstarts.
06077*/06078#definec(n)(1ccommodatetheprocesses06113*intheimage.
06114*Ifaproblemisdetected,thesizeofthe'dummy'arraywillbenegative,06115*causingacompiletimeerror.
Notethatnospaceisactuallyallocated06116*because'dummy'isdeclaredextern.
06117*/06118externintdummy[(NR_BOOT_PROCS==sizeof(image)/06119sizeof(structboot_image))1:-1];06120externintdummy[(BITCHUNK_BITS>NR_BOOT_PROCS-1)1:-1];06121kernel/mpx.
s06200#06201!
Choosesbetweenthe8086and386versionsoftheMinixstartupcode.
0620206203#include06204#if_WORD_SIZE==2MINIXSOURCECODEFile:kernel/mpx.
s56906205#include"mpx88.
s"06206#else06207#include"mpx386.
s"06208#endifkernel/mpx386.
s06300#06301!
Thisfile,mpx386.
s,isincludedbympx.
swhenMinixiscompiledfor06302!
32-bitIntelCPUs.
Thealternativempx88.
siscompiledfor16-bitCPUs.
0630306304!
ThisfileispartofthelowestlayeroftheMINIXkernel.
(Theotherpart06305!
is"proc.
c".
)Thelowestlayerdoesprocessswitchingandmessagehandling.
06306!
FurthermoreitcontainstheassemblerstartupcodeforMinixandthe32-bit06307!
interrupthandlers.
Itcooperateswiththecodein"start.
c"tosetupa06308!
goodenvironmentformain().
0630906310!
Everytransitiontothekernelgoesthroughthisfile.
Transitionstothe06311!
kernelmaybenested.
Theinitialentrymaybewithasystemcall(i.
e.
,06312!
sendorreceiveamessage),anexceptionorahardwareinterrupt;kernel06313!
reentriesmayonlybemadebyhardwareinterrupts.
Thecountofreentries06314!
iskeptin"k_reenter".
Itisimportantfordecidingwhethertoswitchto06315!
thekernelstackandforprotectingthemessagepassingcodein"proc.
c".
0631606317!
Forthemessagepassingtrap,mostofthemachinestateissavedinthe06318!
proctable.
(Someoftheregistersneednotbesaved.
)Thenthestackis06319!
switchedto"k_stack",andinterruptsarereenabled.
Finally,thesystem06320!
callhandler(inC)iscalled.
Whenitreturns,interruptsaredisabled06321!
againandthecodefallsintotherestartroutine,tofinishoffheld-up06322!
interruptsandruntheprocessortaskwhosepointerisin"proc_ptr".
0632306324!
Hardwareinterrupthandlersdothesame,except(1)Theentirestatemust06325!
besaved.
(2)Therearetoomanyhandlerstodothisinline,sothesave06326!
routineiscalled.
Afewcyclesaresavedbypushingtheaddressofthe06327!
appropiaterestartroutineforareturnlater.
(3)Astackswitchis06328!
avoidedwhenthestackisalreadyswitched.
(4)The(master)8259interrupt06329!
controllerisreenabledcentrallyinsave().
(5)Eachinterrupthandler06330!
masksitsinterruptlineusingthe8259beforeenabling(otherunmasked)06331!
interrupts,andunmasksitafterservicingtheinterrupt.
Thislimitsthe06332!
nestleveltothenumberoflinesandprotectsthehandlerfromitself.
0633306334!
Forcommunicationwiththebootmonitoratstartuptimesomeconstant06335!
dataarecompiledintothebeginningofthetextsegment.
Thisfacilitates06336!
readingthedataatthestartofthebootprocess,sinceonlythefirst06337!
sectorofthefileneedstoberead.
0633806339!
Somedatastorageisalsoallocatedattheendofthisfile.
Thisdata06340!
willbeatthestartofthedatasegmentofthekernelandwillberead06341!
andmodifiedbythebootmonitorbeforethekernelstarts.
0634206343!
sections0634406345.
sect.
text06346begtext:06347.
sect.
rom06348begrom:06349.
sect.
data570File:kernel/mpx386.
sMINIXSOURCECODE06350begdata:06351.
sect.
bss06352begbss:0635306354#include06355#include06356#include06357#include06358#include"const.
h"06359#include"protect.
h"06360#include"sconst.
h"0636106362/*Selected386tssoffsets.
*/06363#defineTSS3_S_SP040636406365!
Exportedfunctions06366!
Note:inassemblylanguagethe.
definestatementappliedtoafunctionname06367!
islooselyequivalenttoaprototypeinCcode--itmakesitpossibleto06368!
linktoanentitydeclaredintheassemblycodebutdoesnotcreate06369!
theentity.
0637006371.
define_restart06372.
definesave0637306374.
define_divide_error06375.
define_single_step_exception06376.
define_nmi06377.
define_breakpoint_exception06378.
define_overflow06379.
define_bounds_check06380.
define_inval_opcode06381.
define_copr_not_available06382.
define_double_fault06383.
define_copr_seg_overrun06384.
define_inval_tss06385.
define_segment_not_present06386.
define_stack_exception06387.
define_general_protection06388.
define_page_fault06389.
define_copr_error0639006391.
define_hwint00!
handlersforhardwareinterrupts06392.
define_hwint0106393.
define_hwint0206394.
define_hwint0306395.
define_hwint0406396.
define_hwint0506397.
define_hwint0606398.
define_hwint0706399.
define_hwint0806400.
define_hwint0906401.
define_hwint1006402.
define_hwint1106403.
define_hwint1206404.
define_hwint1306405.
define_hwint1406406.
define_hwint150640706408.
define_s_call06409.
define_p_s_callMINIXSOURCECODEFile:kernel/mpx386.
s57106410.
define_level0_call0641106412!
Exportedvariables.
06413.
definebegbss06414.
definebegdata0641506416.
sect.
text0641706418!
*MINIX*0641906420MINIX:!
thisistheentrypointfortheMINIXkernel06421jmpover_flags!
skipoverthenextfewbytes06422.
data2CLICK_SHIFT!
forthemonitor:memorygranularity06423flags:06424.
data20x01FD!
bootmonitorflags:06425!
callin386mode,makebss,makestack,06426!
loadhigh,don'tpatch,willreturn,06427!
usesgenericINT,memoryvector,06428!
newbootcodereturn06429nop!
extrabytetosyncupdisassembler06430over_flags:0643106432!
SetupaCstackframeonthemonitorstack.
(Themonitorsetscsandds06433!
right.
Thessdescriptorstillreferencesthemonitordatasegment.
)06434movzxesp,sp!
monitorstackisa16bitstack06435pushebp06436movebp,esp06437pushesi06438pushedi06439cmp4(ebp),0!
monitorreturnvectoris06440jznoret!
nonzeroifreturnpossible06441inc(_mon_return)06442noret:mov(_mon_sp),esp!
savestackpointerforlaterreturn0644306444!
Copythemonitorglobaldescriptortabletotheaddressspaceofkerneland06445!
switchovertoit.
Prot_init()canthenupdateitwithimmediateeffect.
0644606447sgdt(_gdt+GDT_SELECTOR)!
getthemonitorgdtr06448movesi,(_gdt+GDT_SELECTOR+2)!
absoluteaddressofGDT06449movebx,_gdt!
addressofkernelGDT06450movecx,8*8!
copyingeightdescriptors06451copygdt:06452esegmovbal,(esi)06453movb(ebx),al06454incesi06455incebx06456loopcopygdt06457moveax,(_gdt+DS_SELECTOR+2)!
baseofkerneldata06458andeax,0x00FFFFFF!
only24bits06459addeax,_gdt!
eax=vir2phys(gdt)06460mov(_gdt+GDT_SELECTOR+2),eax!
setbaseofGDT06461lgdt(_gdt+GDT_SELECTOR)!
switchovertokernelGDT0646206463!
Locatebootparameters,setupkernelsegmentregistersandstack.
06464movebx,8(ebp)!
bootparametersoffset06465movedx,12(ebp)!
bootparameterslength06466moveax,16(ebp)!
addressofa.
outheaders06467mov(_aout),eax06468movax,ds!
kerneldata06469moves,ax572File:kernel/mpx386.
sMINIXSOURCECODE06470movfs,ax06471movgs,ax06472movss,ax06473movesp,k_stktop!
setsptopointtothetopofkernelstack0647406475!
CallCstartupcodetosetupaproperenvironmenttorunmain().
06476pushedx06477pushebx06478pushSS_SELECTOR06479pushDS_SELECTOR06480pushCS_SELECTOR06481call_cstart!
cstart(cs,ds,mds,parmoff,parmlen)06482addesp,5*40648306484!
Reloadgdtr,idtrandthesegmentregisterstoglobaldescriptortableset06485!
upbyprot_init().
0648606487lgdt(_gdt+GDT_SELECTOR)06488lidt(_gdt+IDT_SELECTOR)0648906490jmpfCS_SELECTOR:csinit06491csinit:06492o16movax,DS_SELECTOR06493movds,ax06494moves,ax06495movfs,ax06496movgs,ax06497movss,ax06498o16movax,TSS_SELECTOR!
nootherTSSisused06499ltrax06500push0!
setflagstoknowngoodstate06501popf!
esp,clearnestedtaskandintenable0650206503jmp_main!
main()06504065050650606507!
*interrupthandlers*06508!
*interrupthandlersfor38632-bitprotectedmode*06509065100651106512!
*hwint00-07*0651306514!
Notethisisamacro,itjustlookslikeasubroutine.
06515#definehwint_master(irq)\06516callsave/*saveinterruptedprocessstate*/;\06517push(_irq_handlers+4*irq)/*irq_handlers[irq]*/;\06518call_intr_handle/*intr_handle(irq_handlers[irq])*/;\06519popecx;\06520cmp(_irq_actids+4*irq),0/*interruptstillactive*/;\06521jz0f;\06522inbINT_CTLMASK/*getcurrentmask*/;\06523orbal,[106914#include0691506916FORWARD_PROTOTYPE(char*get_value,(_CONSTchar*params,_CONSTchar*key));0691706918*cstart*0691906920PUBLICvoidcstart(cs,ds,mds,parmoff,parmsize)06921U16_tcs,ds;/*kernelcodeanddatasegment*/06922U16_tmds;/*monitordatasegment*/06923U16_tparmoff,parmsize;/*bootparametersoffsetandlength*/06924{06925/*Performsysteminitializationspriortocallingmain().
Mostsettingsare06926*determinedwithhelpoftheenvironmentstringspassedbyMINIX'loader.
06927*/06928charparams[128*sizeof(char*)];/*bootmonitorparameters*/06929registerchar*value;/*valueinkey=valuepair*/06930externintetext,end;0693106932/*Decideifmodeisprotected;386orhigherimpliesprotectedmode.
06933*Thismustbedonefirst,becauseitisneededfor,e.
g.
,seg2phys().
06934*For286machineswecannotdecideonprotectedmode,yet.
Thisis06935*donebelow.
06936*/06937#if_WORD_SIZE!
=206938machine.
protected=1;06939#endif0694006941/*Recordwherethekernelandthemonitorare.
*/06942kinfo.
code_base=seg2phys(cs);06943kinfo.
code_size=(phys_bytes)&etext;/*sizeofcodesegment*/06944kinfo.
data_base=seg2phys(ds);06945kinfo.
data_size=(phys_bytes)&end;/*sizeofdatasegment*/0694606947/*Initializeprotectedmodedescriptors.
*/06948prot_init();06949MINIXSOURCECODEFile:kernel/start.
c57906950/*Copythebootparameterstothelocalbuffer.
*/06951kinfo.
params_base=seg2phys(mds)+parmoff;06952kinfo.
params_size=MIN(parmsize,sizeof(params)-2);06953phys_copy(kinfo.
params_base,vir2phys(params),kinfo.
params_size);0695406955/*Recordmiscellaneousinformationforuser-spaceservers.
*/06956kinfo.
nr_procs=NR_PROCS;06957kinfo.
nr_tasks=NR_TASKS;06958strncpy(kinfo.
release,OS_RELEASE,sizeof(kinfo.
release));06959kinfo.
release[sizeof(kinfo.
release)-1]='\0';06960strncpy(kinfo.
version,OS_VERSION,sizeof(kinfo.
version));06961kinfo.
version[sizeof(kinfo.
version)-1]='\0';06962kinfo.
proc_addr=(vir_bytes)proc;06963kinfo.
kmem_base=vir2phys(0);06964kinfo.
kmem_size=(phys_bytes)&end;0696506966/*Processor86,186,286,386,.
.
.
06967*Decideifmodeisprotectedforoldermachines.
06968*/06969machine.
processor=atoi(get_value(params,"processor"));06970#if_WORD_SIZE==206971machine.
protected=machine.
processor>=286;06972#endif06973if(!
machine.
protected)mon_return=0;0697406975/*XT,ATorMCAbus*/06976value=get_value(params,"bus");06977if(value==NIL_PTR||strcmp(value,"at")==0){06978machine.
pc_at=TRUE;/*PC-ATcompatiblehardware*/06979}elseif(strcmp(value,"mca")==0){06980machine.
pc_at=machine.
ps_mca=TRUE;/*PS/2withmicrochannel*/06981}0698206983/*TypeofVDU:*/06984value=get_value(params,"video");/*EGAorVGAvideounit*/06985if(strcmp(value,"ega")==0)machine.
vdu_ega=TRUE;06986if(strcmp(value,"vga")==0)machine.
vdu_vga=machine.
vdu_ega=TRUE;0698706988/*Returntoassemblercodetoswitchtoprotectedmode(if286),06989*reloadselectorsandcallmain().
06990*/06991}0699306994*get_value*069950699606997PRIVATEchar*get_value(params,name)06998_CONSTchar*params;/*bootmonitorparameters*/06999_CONSTchar*name;/*keytolookup*/07000{07001/*Getenvironmentvalue-kernelversionofgetenvtoavoidsettingupthe07002*usualenvironmentarray.
07003*/07004register_CONSTchar*namep;07005registerchar*envp;0700607007for(envp=(char*)params;*envp!
=0;){07008for(namep=name;*namep!
=0&&*namep==*envp;namep++,envp++)07009;580File:kernel/start.
cMINIXSOURCECODE07010if(*namep=='\0'&&*envp=='=')return(envp+1);07011while(*envp++!
=0)07012;07013}07014return(NIL_PTR);07015}kernel/main.
c07100/*ThisfilecontainsthemainprogramofMINIXaswellasitsshutdowncode.
07101*Theroutinemain()initializesthesystemandstartstheballrollingby07102*settinguptheprocesstable,interruptvectors,andschedulingeachtask07103*toruntoinitializeitself.
07104*Theroutineshutdown()doestheoppositeandbringsdownMINIX.
07105*07106*Theentriesintothisfileare:07107*main:MINIXmainprogram07108*prepare_shutdown:preparetotakeMINIXdown07109*07110*Changes:07111*Nov24,2004simplifiedmain()withsystemimage(JorritN.
Herder)07112*Aug20,2004newprepare_shutdown()andshutdown()(JorritN.
Herder)07113*/07114#include"kernel.
h"07115#include07116#include07117#include07118#include07119#include07120#include07121#include"proc.
h"0712207123/*PrototypedeclarationsforPRIVATEfunctions.
*/07124FORWARD_PROTOTYPE(voidannounce,(void));07125FORWARD_PROTOTYPE(voidshutdown,(timer_t*tp));071260712707128*main*0712907130PUBLICvoidmain()07131{07132/*Starttheballrolling.
*/07133structboot_image*ip;/*bootimagepointer*/07134registerstructproc*rp;/*processpointer*/07135registerstructpriv*sp;/*privilegestructurepointer*/07136registerinti,s;07137inthdrindex;/*indextoarrayofa.
outheaders*/07138phys_clickstext_base;07139vir_clickstext_clicks,data_clicks;07140reg_tktsb;/*kerneltaskstackbase*/07141structexece_hdr;/*foracopyofana.
outheader*/0714207143/*Initializetheinterruptcontroller.
*/07144intr_init(1);MINIXSOURCECODEFile:kernel/main.
c5810714507146/*Cleartheprocesstable.
Anounceeachslotasemptyandsetupmappings07147*forproc_addr()andproc_nr()macros.
Dothesameforthetablewith07148*privilegestructuresforthesystemprocesses.
07149*/07150for(rp=BEG_PROC_ADDR,i=-NR_TASKS;rpp_rts_flags=SLOT_FREE;/*initializefreeslot*/07152rp->p_nr=i;/*procnumberfromptr*/07153(pproc_addr+NR_TASKS)[i]=rp;/*procptrfromnumber*/07154}07155for(sp=BEG_PRIV_ADDR,i=0;sps_proc_nr=NONE;/*initializeasfree*/07157sp->s_id=i;/*privstructureindex*/07158ppriv_addr[i]=sp;/*privptrfromnumber*/07159}0716007161/*Setupproctableentriesfortasksandservers.
Thestacksofthe07162*kerneltasksareinitializedtoanarrayindataspace.
Thestacks07163*oftheservershavebeenaddedtothedatasegmentbythemonitor,so07164*thestackpointerissettotheendofthedatasegment.
Allthe07165*processesareinlowmemoryonthe8086.
Onthe386onlythekernel07166*isinlowmemory,therestisloadedinextendedmemory.
07167*/0716807169/*Taskstacks.
*/07170ktsb=(reg_t)t_stack;0717107172for(i=0;iproc_nr);/*getprocesspointer*/07175rp->p_max_priority=ip->priority;/*maxschedulingpriority*/07176rp->p_priority=ip->priority;/*currentpriority*/07177rp->p_quantum_size=ip->quantum;/*quantumsizeinticks*/07178rp->p_ticks_left=ip->quantum;/*currentcredit*/07179strncpy(rp->p_name,ip->proc_name,P_NAME_LEN);/*setprocessname*/07180(void)get_priv(rp,(ip->flags&SYS_PROC));/*assignstructure*/07181priv(rp)->s_flags=ip->flags;/*processflags*/07182priv(rp)->s_trap_mask=ip->trap_mask;/*allowedtraps*/07183priv(rp)->s_call_mask=ip->call_mask;/*kernelcallmask*/07184priv(rp)->s_ipc_to.
chunk[0]=ip->ipc_to;/*restricttargets*/07185if(iskerneln(proc_nr(rp)partofthekernel*/07186if(ip->stksize>0){/*HARDWAREstacksizeis0*/07187rp->p_priv->s_stack_guard=(reg_t*)ktsb;07188*rp->p_priv->s_stack_guard=STACK_GUARD;07189}07190ktsb+=ip->stksize;/*pointtohighendofstack*/07191rp->p_reg.
sp=ktsb;/*thistask'sinitialstackptr*/07192text_base=kinfo.
code_base>>CLICK_SHIFT;07193/*processesthatareinthekernel*/07194hdrindex=0;/*allusethefirsta.
outheader*/07195}else{07196hdrindex=1+i-NR_TASKS;/*servers,drivers,INIT*/07197}0719807199/*Thebootstraploadercreatedanarrayofthea.
outheadersat07200*absoluteaddress'aout'.
Getoneelementtoe_hdr.
07201*/07202phys_copy(aout+hdrindex*A_MINHDR,vir2phys(&e_hdr),07203(phys_bytes)A_MINHDR);07204/*Convertaddressestoclicksandbuildprocessmemorymap*/582File:kernel/main.
cMINIXSOURCECODE07205text_base=e_hdr.
a_syms>>CLICK_SHIFT;07206text_clicks=(e_hdr.
a_text+CLICK_SIZE-1)>>CLICK_SHIFT;07207if(!
(e_hdr.
a_flags&A_SEP))text_clicks=0;/*commonI&D*/07208data_clicks=(e_hdr.
a_total+CLICK_SIZE-1)>>CLICK_SHIFT;07209rp->p_memmap[T].
mem_phys=text_base;07210rp->p_memmap[T].
mem_len=text_clicks;07211rp->p_memmap[D].
mem_phys=text_base+text_clicks;07212rp->p_memmap[D].
mem_len=data_clicks;07213rp->p_memmap[S].
mem_phys=text_base+text_clicks+data_clicks;07214rp->p_memmap[S].
mem_vir=data_clicks;/*empty-stackisindata*/0721507216/*Setinitialregistervalues.
Theprocessorstatuswordfortasks07217*isdifferentfromthatofotherprocessesbecausetaskscan07218*accessI/O;thisisnotallowedtoless-privilegedprocesses07219*/07220rp->p_reg.
pc=(reg_t)ip->initial_pc;07221rp->p_reg.
psw=(iskernelp(rp))INIT_TASK_PSW:INIT_PSW;0722207223/*Initializetheserverstackpointer.
Takeitdownoneword07224*togivecrtso.
ssomethingtouseas"argc".
07225*/07226if(isusern(proc_nr(rp)user-spaceprocess*/07227rp->p_reg.
sp=(rp->p_memmap[S].
mem_vir+07228rp->p_memmap[S].
mem_len)p_reg.
sp-=sizeof(reg_t);07230}0723107232/*Setready.
TheHARDWAREtaskisneverready.
*/07233if(rp->p_nr!
=HARDWARE){07234rp->p_rts_flags=0;/*runnableifnoflags*/07235lock_enqueue(rp);/*addtoschedulingqueues*/07236}else{07237rp->p_rts_flags=NO_MAP;/*preventfromrunning*/07238}0723907240/*Codeanddatasegmentsmustbeallocatedinprotectedmode.
*/07241alloc_segments(rp);07242}0724307244/*We'redefinitelynotshuttingdown.
*/07245shutdown_started=0;0724607247/*MINIXisnowready.
Allbootimageprocessesareonthereadyqueue.
07248*Returntotheassemblycodetostartrunningthecurrentprocess.
07249*/07250bill_ptr=proc_addr(IDLE);/*ithastopointsomewhere*/07251announce();/*printMINIXstartupbanner*/07252restart();07253}0725507256*announce*0725707258PRIVATEvoidannounce(void)07259{07260/*DisplaytheMINIXstartupbanner.
*/07261kprintf("MINIX%s.
%s.
"07262"Copyright2006,VrijeUniversiteit,Amsterdam,TheNetherlands\n",07263OS_RELEASE,OS_VERSION);07264MINIXSOURCECODEFile:kernel/main.
c58307265/*Realmode,or16/32-bitprotectedmode*/07266kprintf("Executingin%smode.
\n\n",07267machine.
protected"32-bitprotected":"real");07268}0727007271*prepare_shutdown*0727207273PUBLICvoidprepare_shutdown(how)07274inthow;07275{07276/*ThisfunctionpreparestoshutdownMINIX.
*/07277statictimer_tshutdown_timer;07278registerstructproc*rp;07279messagem;0728007281/*Showdebuggingdumpsonpanics.
MakesurethattheTTYtaskisstill07282*availabletohandlethem.
Thisisdonewithhelpofanon-blockingsend.
07283*WerelyonTTYtocallsys_abort()whenitisdonewiththedumps.
07284*/07285if(how==RBT_PANIC){07286m.
m_type=PANIC_DUMPS;07287if(nb_send(TTY_PROC_NR,&m)==OK)/*don'tblockifTTYisn'tready*/07288return;/*awaitsys_abort()fromTTY*/07289}0729007291/*Sendasignaltoallsystemprocessesthatarestillalivetoinform07292*themthattheMINIXkernelisshuttingdown.
Apropershutdownsequence07293*shouldbeimplementedbyauser-spaceserver.
Thismechanismisuseful07294*asabackupincaseofsystempanics,sothatsystemprocessescanstill07295*runtheirshutdowncode,e.
g,tosynchronizetheFSortolettheTTY07296*switchtothefirstconsole.
07297*/07298kprintf("SendingSIGKSTOPtosystemprocesses.
.
.
\n");07299for(rp=BEG_PROC_ADDR;rps_flags&SYS_PROC)&&!
iskernelp(rp))07301send_sig(proc_nr(rp),SIGKSTOP);07302}0730307304/*We'reshuttingdown.
Diagnosticsmaybehavedifferentlynow.
*/07305shutdown_started=1;0730607307/*Notifysystemprocessesoftheupcomingshutdownandallowthemtobe07308*scheduledbysettingawatchogtimerthatcallsshutdown().
Thetimer07309*argumentpassestheshutdownstatus.
07310*/07311kprintf("MINIXwillnowbeshutdown.
.
.
\n");07312tmr_arg(&shutdown_timer)->ta_int=how;0731307314/*Continueafter1second,togiveprocessesachancetoget07315*scheduledtodoshutdownwork.
07316*/07317set_timer(&shutdown_timer,get_uptime()+HZ,shutdown);07318}0732007321*shutdown*0732207323PRIVATEvoidshutdown(tp)07324timer_t*tp;584File:kernel/main.
cMINIXSOURCECODE07325{07326/*Thisfunctioniscalledfromprepare_shutdownorstop_sequencetobring07327*downMINIX.
Howtoshutdownisintheargument:RBT_HALT(returntothe07328*monitor),RBT_MONITOR(executegivencode),RBT_RESET(hardreset).
07329*/07330inthow=tmr_arg(tp)->ta_int;07331u16_tmagic;0733207333/*Nowmaskallinterrupts,includingtheclock,andstoptheclock.
*/07334outb(INT_CTLMASK,0);07335clock_stop();0733607337if(mon_return&&how!
=RBT_RESET){07338/*ReinitializetheinterruptcontrollerstotheBIOSdefaults.
*/07339intr_init(0);07340outb(INT_CTLMASK,0);07341outb(INT2_CTLMASK,0);0734207343/*Returntothebootmonitor.
Settheprogramifnotalreadydone.
*/07344if(how!
=RBT_MONITOR)phys_copy(vir2phys(""),kinfo.
params_base,1);07345level0(monitor);07346}0734707348/*Resetthesystembyjumpingtotheresetaddress(realmode),orby07349*forcingaprocessorshutdown(protectedmode).
FirststoptheBIOS07350*memorytestbysettingasoftresetflag.
07351*/07352magic=STOP_MEM_CHECK;07353phys_copy(vir2phys(&magic),SOFT_RESET_FLAG_ADDR,SOFT_RESET_FLAG_SIZE);07354level0(reset);07355}kernel/proc.
c07400/*Thisfilecontainsessentiallyalloftheprocessandmessagehandling.
07401*Togetherwith"mpx.
s"itformsthelowestlayeroftheMINIXkernel.
07402*Thereisoneentrypointfromtheoutside:07403*07404*sys_call:asystemcall,i.
e.
,thekernelistrappedwithanINT07405*07406*Aswellasseveralentrypointsusedfromtheinterruptandtasklevel:07407*07408*lock_notify:notifyaprocessofasystemevent07409*lock_send:sendamessagetoaprocess07410*lock_enqueue:putaprocessononeoftheschedulingqueues07411*lock_dequeue:removeaprocessfromtheschedulingqueues07412*07413*Changes:07414*Aug19,2005rewroteschedulingcode(JorritN.
Herder)07415*Jul25,2005rewrotesystemcallhandling(JorritN.
Herder)07416*May26,2005rewrotemessagepassingfunctions(JorritN.
Herder)07417*May24,2005newnotificationsystemcall(JorritN.
Herder)07418*Oct28,2004nonblockingsendandreceivecalls(JorritN.
Herder)07419*MINIXSOURCECODEFile:kernel/proc.
c58507420*Thecodehereiscriticaltomakeeverythingworkandisimportantforthe07421*overallperformanceofthesystem.
Alargefractionofthecodedealswith07422*listmanipulation.
Tomakethisbotheasytounderstandandfasttoexecute07423*pointerpointersareusedthroughoutthecode.
Pointerpointersprevent07424*exceptionsfortheheadortailofalinkedlist.
07425*07426*node_t*queue,*new_node;//assumetheseasglobalvariables07427*node_t**xpp=&queue;//getpointerpointertoheadofqueue07428*while(*xpp!
=NULL)//findlastpointerofthelinkedlist07429*xpp=&(*xpp)->next;//getpointertonextpointer07430**xpp=new_node;//nowreplacetheend(theNULLpointer)07431*new_node->next=NULL;//andmarkthenewendofthelist07432*07433*Forexample,whenaddinganewnodetotheendofthelist,onenormally07434*makesanexceptionforanemptylistandlooksuptheendofthelistfor07435*nonemptylists.
Asshownabove,thisisnotrequiredwithpointerpointers.
07436*/0743707438#include07439#include07440#include"kernel.
h"07441#include"proc.
h"0744207443/*Schedulingandmessagepassingfunctions.
Thefunctionsareavailableto07444*otherpartsofthekernelthroughlock_.
.
.
().
Thelocktemporarilydisables07445*interruptstopreventraceconditions.
07446*/07447FORWARD_PROTOTYPE(intmini_send,(structproc*caller_ptr,intdst,07448message*m_ptr,unsignedflags));07449FORWARD_PROTOTYPE(intmini_receive,(structproc*caller_ptr,intsrc,07450message*m_ptr,unsignedflags));07451FORWARD_PROTOTYPE(intmini_notify,(structproc*caller_ptr,intdst));0745207453FORWARD_PROTOTYPE(voidenqueue,(structproc*rp));07454FORWARD_PROTOTYPE(voiddequeue,(structproc*rp));07455FORWARD_PROTOTYPE(voidsched,(structproc*rp,int*queue,int*front));07456FORWARD_PROTOTYPE(voidpick_proc,(void));0745707458#defineBuildMess(m_ptr,src,dst_ptr)\07459(m_ptr)->m_source=(src);\07460(m_ptr)->m_type=NOTIFY_FROM(src);\07461(m_ptr)->NOTIFY_TIMESTAMP=get_uptime();\07462switch(src){\07463caseHARDWARE:\07464(m_ptr)->NOTIFY_ARG=priv(dst_ptr)->s_int_pending;\07465priv(dst_ptr)->s_int_pending=0;\07466break;\07467caseSYSTEM:\07468(m_ptr)->NOTIFY_ARG=priv(dst_ptr)->s_sig_pending;\07469priv(dst_ptr)->s_sig_pending=0;\07470break;\07471}0747207473#defineCopyMess(s,sp,sm,dp,dm)\07474cp_mess(s,(sp)->p_memmap[D].
mem_phys,\07475(vir_bytes)sm,(dp)->p_memmap[D].
mem_phys,(vir_bytes)dm)07476586File:kernel/proc.
cMINIXSOURCECODE0747707478*sys_call*0747907480PUBLICintsys_call(call_nr,src_dst,m_ptr)07481intcall_nr;/*systemcallnumberandflags*/07482intsrc_dst;/*srctoreceivefromordsttosendto*/07483message*m_ptr;/*pointertomessageinthecaller'sspace*/07484{07485/*SystemcallsaredonebytrappingtothekernelwithanINTinstruction.
07486*Thetrapiscaughtandsys_call()iscalledtosendorreceiveamessage07487*(orboth).
Thecallerisalwaysgivenby'proc_ptr'.
07488*/07489registerstructproc*caller_ptr=proc_ptr;/*getpointertocaller*/07490intfunction=call_nr&SYSCALL_FUNC;/*getsystemcallfunction*/07491unsignedflags=call_nr&SYSCALL_FLAGS;/*getflags*/07492intmask_entry;/*bittocheckinsendmask*/07493intresult;/*thesystemcall'sresult*/07494vir_clicksvlo,vhi;/*virtualclickscontainingmessagetosend*/0749507496/*Checkiftheprocesshasprivilegesfortherequestedcall.
Callstothe07497*kernelmayonlybeSENDREC,becausetasksalwaysreplyandmaynotblock07498*ifthecallerdoesn'tdoreceive().
07499*/07500if(!
(priv(caller_ptr)->s_trap_mask&(1>CLICK_SHIFT;07522vhi=((vir_bytes)m_ptr+MESS_SIZE-1)>>CLICK_SHIFT;07523if(vlop_memmap[D].
mem_vir||vlo>vhi||07524vhi>=caller_ptr->p_memmap[S].
mem_vir+07525caller_ptr->p_memmap[S].
mem_len){07526kprintf("sys_call:invalidmessagepointer,trap%d,caller%d\n",07527function,proc_nr(caller_ptr));07528return(EFAULT);/*invalidmessagepointer*/07529}07530}0753107532/*Ifthecallistosendtoaprocess,i.
e.
,forSEND,SENDRECorNOTIFY,07533*verifythatthecallerisallowedtosendtothegivendestinationand07534*thatthedestinationisstillalive.
07535*/07536if(function&CHECK_DST){MINIXSOURCECODEFile:kernel/proc.
c58707537if(!
get_sys_bit(priv(caller_ptr)->s_ipc_to,nr_to_id(src_dst))){07538kprintf("sys_call:ipcmaskdenied%dsendingto%d\n",07539proc_nr(caller_ptr),src_dst);07540return(ECALLDENIED);/*calldeniedbyipcmask*/07541}0754207543if(isemptyn(src_dst)&&!
shutdown_started){07544kprintf("sys_call:deaddest;%d,%d,%d\n",07545function,proc_nr(caller_ptr),src_dst);07546return(EDEADDST);/*cannotsendtothedead*/07547}07548}0754907550/*Nowcheckifthecallisknownandtrytoperformtherequest.
Theonly07551*systemcallsthatexistinMINIXaresendingandreceivingmessages.
07552*-SENDREC:combinesSENDandRECEIVEinasinglesystemcall07553*-SEND:senderblocksuntilitsmessagehasbeendelivered07554*-RECEIVE:receiverblocksuntilanacceptablemessagehasarrived07555*-NOTIFY:nonblockingcall;delivernotificationormarkpending07556*-ECHO:nonblockingcall;directlyechobackthemessage07557*/07558switch(function){07559caseSENDREC:07560/*AflagissetsothatnotificationscannotinterruptSENDREC.
*/07561priv(caller_ptr)->s_flags|=SENDREC_BUSY;07562/*fallthrough*/07563caseSEND:07564result=mini_send(caller_ptr,src_dst,m_ptr,flags);07565if(function==SEND||result!
=OK){07566break;/*done,orSENDfailed*/07567}/*fallthroughforSENDREC*/07568caseRECEIVE:07569if(function==RECEIVE)07570priv(caller_ptr)->s_flags&=SENDREC_BUSY;07571result=mini_receive(caller_ptr,src_dst,m_ptr,flags);07572break;07573caseNOTIFY:07574result=mini_notify(caller_ptr,src_dst);07575break;07576caseECHO:07577CopyMess(caller_ptr->p_nr,caller_ptr,m_ptr,caller_ptr,m_ptr);07578result=OK;07579break;07580default:07581result=EBADCALL;/*illegalsystemcall*/07582}0758307584/*Now,returntheresultofthesystemcalltothecaller.
*/07585return(result);07586}0758807589*mini_send*0759007591PRIVATEintmini_send(caller_ptr,dst,m_ptr,flags)07592registerstructproc*caller_ptr;/*whoistryingtosendamessage*/07593intdst;/*towhomismessagebeingsent*/07594message*m_ptr;/*pointertomessagebuffer*/07595unsignedflags;/*systemcallflags*/07596{588File:kernel/proc.
cMINIXSOURCECODE07597/*Sendamessagefrom'caller_ptr'to'dst'.
If'dst'isblockedwaiting07598*forthismessage,copythemessagetoitandunblock'dst'.
If'dst'is07599*notwaitingatall,oriswaitingforanothersource,queue'caller_ptr'.
07600*/07601registerstructproc*dst_ptr=proc_addr(dst);07602registerstructproc**xpp;07603registerstructproc*xp;0760407605/*Checkfordeadlockby'caller_ptr'and'dst'sendingtoeachother.
*/07606xp=dst_ptr;07607while(xp->p_rts_flags&SENDING){/*checkwhilesending*/07608xp=proc_addr(xp->p_sendto);/*getxp'sdestination*/07609if(xp==caller_ptr)return(ELOCKED);/*deadlockifcyclic*/07610}0761107612/*Checkif'dst'isblockedwaitingforthismessage.
Thedestination's07613*SENDINGflagmaybesetwhenitsSENDRECcallblockedwhilesending.
07614*/07615if((dst_ptr->p_rts_flags&(RECEIVING|SENDING))==RECEIVING&&07616(dst_ptr->p_getfrom==ANY||dst_ptr->p_getfrom==caller_ptr->p_nr)){07617/*Destinationisindeedwaitingforthismessage.
*/07618CopyMess(caller_ptr->p_nr,caller_ptr,m_ptr,dst_ptr,07619dst_ptr->p_messbuf);07620if((dst_ptr->p_rts_flags&=RECEIVING)==0)enqueue(dst_ptr);07621}elseif(!
(flags&NON_BLOCKING)){07622/*Destinationisnotwaiting.
Blockanddequeuecaller.
*/07623caller_ptr->p_messbuf=m_ptr;07624if(caller_ptr->p_rts_flags==0)dequeue(caller_ptr);07625caller_ptr->p_rts_flags|=SENDING;07626caller_ptr->p_sendto=dst;0762707628/*Processisnowblocked.
Putinonthedestination'squeue.
*/07629xpp=&dst_ptr->p_caller_q;/*findendoflist*/07630while(*xpp!
=NIL_PROC)xpp=&(*xpp)->p_q_link;07631*xpp=caller_ptr;/*addcallertoend*/07632caller_ptr->p_q_link=NIL_PROC;/*marknewendoflist*/07633}else{07634return(ENOTREADY);07635}07636return(OK);07637}0763907640*mini_receive*0764107642PRIVATEintmini_receive(caller_ptr,src,m_ptr,flags)07643registerstructproc*caller_ptr;/*processtryingtogetmessage*/07644intsrc;/*whichmessagesourceiswanted*/07645message*m_ptr;/*pointertomessagebuffer*/07646unsignedflags;/*systemcallflags*/07647{07648/*Aprocessortaskwantstogetamessage.
Ifamessageisalreadyqueued,07649*acquireitanddeblockthesender.
Ifnomessagefromthedesiredsource07650*isavailableblockthecaller,unlesstheflagsdon'tallowblocking.
07651*/07652registerstructproc**xpp;07653registerstructnotification**ntf_q_pp;07654messagem;07655intbit_nr;07656sys_map_t*map;MINIXSOURCECODEFile:kernel/proc.
c58907657bitchunk_t*chunk;07658inti,src_id,src_proc_nr;0765907660/*Checktoseeifamessagefromdesiredsourceisalreadyavailable.
07661*Thecaller'sSENDINGflagmaybesetifSENDRECcouldn'tsend.
Ifitis07662*set,theprocessshouldbeblocked.
07663*/07664if(!
(caller_ptr->p_rts_flags&SENDING)){0766507666/*Checkiftherearependingnotifications,exceptforSENDREC.
*/07667if(!
(priv(caller_ptr)->s_flags&SENDREC_BUSY)){0766807669map=&priv(caller_ptr)->s_notify_pending;07670for(chunk=&map->chunk[0];chunkchunk[NR_SYS_CHUNKS];chunk++){0767107672/*Findapendingnotificationfromtherequestedsource.
*/07673if(!
*chunk)continue;/*nobitsinchunk*/07674for(i=0;!
(*chunk&(1chunk[0])*BITCHUNK_BITS+i;07676if(src_id>=NR_SYS_PROCS)break;/*outofrange*/07677src_proc_nr=id_to_nr(src_id);/*getsourceproc*/07678if(src!
=ANY&&src!
=src_proc_nr)continue;/*sourcenotok*/07679*chunk&=(1ccess*/07685}07686}0768707688/*Checkcallerqueue.
Usepointerpointerstokeepcodesimple.
*/07689xpp=&caller_ptr->p_caller_q;07690while(*xpp!
=NIL_PROC){07691if(src==ANY||src==proc_nr(*xpp)){07692/*Foundacceptablemessage.
Copyitandupdatestatus.
*/07693CopyMess((*xpp)->p_nr,*xpp,(*xpp)->p_messbuf,caller_ptr,m_ptr);07694if(((*xpp)->p_rts_flags&=SENDING)==0)enqueue(*xpp);07695*xpp=(*xpp)->p_q_link;/*removefromqueue*/07696return(OK);/*reportsuccess*/07697}07698xpp=&(*xpp)->p_q_link;/*proceedtonext*/07699}07700}0770107702/*Nosuitablemessageisavailableorthecallercouldn'tsendinSENDREC.
07703*Blocktheprocesstryingtoreceive,unlesstheflagstellotherwise.
07704*/07705if(!
(flags&NON_BLOCKING)){07706caller_ptr->p_getfrom=src;07707caller_ptr->p_messbuf=m_ptr;07708if(caller_ptr->p_rts_flags==0)dequeue(caller_ptr);07709caller_ptr->p_rts_flags|=RECEIVING;07710return(OK);07711}else{07712return(ENOTREADY);07713}07714}590File:kernel/proc.
cMINIXSOURCECODE0771607717*mini_notify*0771807719PRIVATEintmini_notify(caller_ptr,dst)07720registerstructproc*caller_ptr;/*senderofthenotification*/07721intdst;/*whichprocesstonotify*/07722{07723registerstructproc*dst_ptr=proc_addr(dst);07724intsrc_id;/*sourceidforlatedelivery*/07725messagem;/*thenotificationmessage*/0772607727/*Checktoseeiftargetisblockedwaitingforthismessage.
Aprocess07728*canbebothsendingandreceivingduringaSENDRECsystemcall.
07729*/07730if((dst_ptr->p_rts_flags&(RECEIVING|SENDING))==RECEIVING&&07731!
(priv(dst_ptr)->s_flags&SENDREC_BUSY)&&07732(dst_ptr->p_getfrom==ANY||dst_ptr->p_getfrom==caller_ptr->p_nr)){0773307734/*Destinationisindeedwaitingforamessage.
Assembleanotification07735*messageanddeliverit.
Copyfrompseudo-sourceHARDWARE,sincethe07736*messageisinthekernel'saddressspace.
07737*/07738BuildMess(&m,proc_nr(caller_ptr),dst_ptr);07739CopyMess(proc_nr(caller_ptr),proc_addr(HARDWARE),&m,07740dst_ptr,dst_ptr->p_messbuf);07741dst_ptr->p_rts_flags&=RECEIVING;/*deblockdestination*/07742if(dst_ptr->p_rts_flags==0)enqueue(dst_ptr);07743return(OK);07744}0774507746/*Destinationisnotreadytoreceivethenotification.
Addittothe07747*bitmapwithpendingnotifications.
Notetheindirectness:thesystemid07748*insteadoftheprocessnumberisusedinthependingbitmap.
07749*/07750src_id=priv(caller_ptr)->s_id;07751set_sys_bit(priv(dst_ptr)->s_notify_pending,src_id);07752return(OK);07753}0775507756*lock_notify*0775707758PUBLICintlock_notify(src,dst)07759intsrc;/*senderofthenotification*/07760intdst;/*whoistobenotified*/07761{07762/*Safegatewaytomini_notify()fortasksandinterrupthandlers.
Thesender07763*isexplicitlygiventopreventconfusionwherethecallcomesfrom.
MINIX07764*kernelisnotreentrant,whichmeanstointerruptsaredisabledafter07765*thefirstkernelentry(hardwareinterrupt,trap,orexception).
Locking07766*isdonebytemporarilydisablinginterrupts.
07767*/07768intresult;0776907770/*Exceptionorinterruptoccurred,thusalreadylocked.
*/07771if(k_reenter>=0){07772result=mini_notify(proc_addr(src),dst);07773}0777407775/*Callfromtasklevel,lockingisrequired.
*/MINIXSOURCECODEFile:kernel/proc.
c59107776else{07777lock(0,"notify");07778result=mini_notify(proc_addr(src),dst);07779unlock(0);07780}07781return(result);07782}0778407785*enqueue*0778607787PRIVATEvoidenqueue(rp)07788registerstructproc*rp;/*thisprocessisnowrunnable*/07789{07790/*Add'rp'tooneofthequeuesofrunnableprocesses.
Thisfunctionis07791*responsibleforinsertingaprocessintooneoftheschedulingqueues.
07792*Themechanismisimplementedhere.
Theactualschedulingpolicyis07793*definedinsched()andpick_proc().
07794*/07795intq;/*schedulingqueuetouse*/07796intfront;/*addtofrontorback*/0779707798/*Determinewheretoinserttoprocess.
*/07799sched(rp,&q,&front);0780007801/*Nowaddtheprocesstothequeue.
*/07802if(rdy_head[q]==NIL_PROC){/*addtoemptyqueue*/07803rdy_head[q]=rdy_tail[q]=rp;/*createanewqueue*/07804rp->p_nextready=NIL_PROC;/*marknewend*/07805}07806elseif(front){/*addtoheadofqueue*/07807rp->p_nextready=rdy_head[q];/*chainheadofqueue*/07808rdy_head[q]=rp;/*setnewqueuehead*/07809}07810else{/*addtotailofqueue*/07811rdy_tail[q]->p_nextready=rp;/*chaintailofqueue*/07812rdy_tail[q]=rp;/*setnewqueuetail*/07813rp->p_nextready=NIL_PROC;/*marknewend*/07814}0781507816/*Nowselectthenextprocesstorun.
*/07817pick_proc();07818}0782007821*dequeue*0782207823PRIVATEvoiddequeue(rp)07824registerstructproc*rp;/*thisprocessisnolongerrunnable*/07825{07826/*Aprocessmustberemovedfromtheschedulingqueues,forexample,because07827*ithasblocked.
Ifthecurrentlyactiveprocessisremoved,anewprocess07828*ispickedtorunbycallingpick_proc().
07829*/07830registerintq=rp->p_priority;/*queuetouse*/07831registerstructproc**xpp;/*iterateoverqueue*/07832registerstructproc*prev_xp;0783307834/*Side-effectforkernel:checkifthetask'sstackstillisok*/07835if(iskernelp(rp)){592File:kernel/proc.
cMINIXSOURCECODE07836if(*priv(rp)->s_stack_guard!
=STACK_GUARD)07837panic("stackoverrunbytask",proc_nr(rp));07838}0783907840/*Nowmakesurethattheprocessisnotinitsreadyqueue.
Removethe07841*processifitisfound.
Aprocesscanbemadeunreadyevenifitisnot07842*runningbybeingsentasignalthatkillsit.
07843*/07844prev_xp=NIL_PROC;07845for(xpp=&rdy_head[q];*xpp!
=NIL_PROC;xpp=&(*xpp)->p_nextready){0784607847if(*xpp==rp){/*foundprocesstoremove*/07848*xpp=(*xpp)->p_nextready;/*replacewithnextchain*/07849if(rp==rdy_tail[q])/*queuetailremoved*/07850rdy_tail[q]=prev_xp;/*setnewtail*/07851if(rp==proc_ptr||rp==next_ptr)/*activeprocessremoved*/07852pick_proc();/*picknewprocesstorun*/07853break;07854}07855prev_xp=*xpp;/*savepreviousinchain*/07856}07857}0785907860*sched*0786107862PRIVATEvoidsched(rp,queue,front)07863registerstructproc*rp;/*processtobescheduled*/07864int*queue;/*return:queuetouse*/07865int*front;/*return:frontorback*/07866{07867/*Thisfunctiondeterminestheschedulingpolicy.
Itiscalledwhenevera07868*processmustbeaddedtooneoftheschedulingqueuestodecidewhereto07869*insertit.
Asaside-effecttheprocess'prioritymaybeupdated.
07870*/07871staticstructproc*prev_ptr=NIL_PROC;/*previouswithouttime*/07872inttime_left=(rp->p_ticks_left>0);/*quantumfullyconsumed*/07873intpenalty=0;/*changeinpriority*/0787407875/*Checkwhethertheprocesshastimeleft.
Otherwisegiveanewquantum07876*andpossiblyraisethepriority.
Processesusingmultiplequantums07877*inarowgetalowerprioritytocatchinfiniteloopsinhighpriority07878*processes(systemserversanddrivers).
07879*/07880if(!
time_left){/*quantumconsumed*/07881rp->p_ticks_left=rp->p_quantum_size;/*givenewquantum*/07882if(prev_ptr==rp)penalty++;/*catchinfiniteloops*/07883elsepenalty--;/*giveslowwayback*/07884prev_ptr=rp;/*storeptrfornext*/07885}0788607887/*Determinethenewpriorityofthisprocess.
Theboundsaredetermined07888*byIDLE'squeueandthemaximumpriorityofthisprocess.
Kerneltasks07889*andtheidleprocessareneverchangedinpriority.
07890*/07891if(penalty!
=0&&!
iskernelp(rp)){07892rp->p_priority+=penalty;/*updatewithpenalty*/07893if(rp->p_priorityp_max_priority)/*checkupperbound*/07894rp->p_priority=rp->p_max_priority;07895elseif(rp->p_priority>IDLE_Q-1)/*checklowerbound*/MINIXSOURCECODEFile:kernel/proc.
c59307896rp->p_priority=IDLE_Q-1;07897}0789807899/*Ifthereistimeleft,theprocessisaddedtothefrontofitsqueue,07900*sothatitcanimmediatelyrun.
Thequeuetousesimplyisalwaysthe07901*process'currentpriority.
07902*/07903*queue=rp->p_priority;07904*front=time_left;07905}0790707908*pick_proc*0790907910PRIVATEvoidpick_proc()07911{07912/*Decidewhotorunnow.
Anewprocessisselectedbysetting'next_ptr'.
07913*Whenabillableprocessisselected,recorditin'bill_ptr',sothatthe07914*clocktaskcantellwhotobillforsystemtime.
07915*/07916registerstructproc*rp;/*processtorun*/07917intq;/*iterateoverqueues*/0791807919/*Checkeachoftheschedulingqueuesforreadyprocesses.
Thenumberof07920*queuesisdefinedinproc.
h,andprioritiesaresetintheimagetable.
07921*ThelowestqueuecontainsIDLE,whichisalwaysready.
07922*/07923for(q=0;qs_flags&BILLABLE)07927bill_ptr=rp;/*billforsystemtime*/07928return;07929}07930}07931}0793307934*lock_send*0793507936PUBLICintlock_send(dst,m_ptr)07937intdst;/*towhomismessagebeingsent*/07938message*m_ptr;/*pointertomessagebuffer*/07939{07940/*Safegatewaytomini_send()fortasks.
*/07941intresult;07942lock(2,"send");07943result=mini_send(proc_ptr,dst,m_ptr,NON_BLOCKING);07944unlock(2);07945return(result);07946}0794807949*lock_enqueue*0795007951PUBLICvoidlock_enqueue(rp)07952structproc*rp;/*thisprocessisnowrunnable*/07953{07954/*Safegatewaytoenqueue()fortasks.
*/07955lock(3,"enqueue");594File:kernel/proc.
cMINIXSOURCECODE07956enqueue(rp);07957unlock(3);07958}0796007961*lock_dequeue*0796207963PUBLICvoidlock_dequeue(rp)07964structproc*rp;/*thisprocessisnolongerrunnable*/07965{07966/*Safegatewaytodequeue()fortasks.
*/07967lock(4,"dequeue");07968dequeue(rp);07969unlock(4);07970}kernel/exception.
c08000/*Thisfilecontainsasimpleexceptionhandler.
Exceptionsinuser08001*processesareconvertedtosignals.
Exceptionsinakerneltaskcause08002*apanic.
08003*/0800408005#include"kernel.
h"08006#include08007#include"proc.
h"080080800908010*exception*0801108012PUBLICvoidexception(vec_nr)08013unsignedvec_nr;08014{08015/*Anexceptionorunexpectedinterrupthasoccurred.
*/0801608017structex_s{08018char*msg;08019intsignum;08020intminprocessor;08021};08022staticstructex_sex_data[]={08023{"Divideerror",SIGFPE,86},08024{"Debugexception",SIGTRAP,86},08025{"Nonmaskableinterrupt",SIGBUS,86},08026{"Breakpoint",SIGEMT,86},08027{"Overflow",SIGFPE,86},08028{"Boundscheck",SIGFPE,186},08029{"Invalidopcode",SIGILL,186},08030{"Coprocessornotavailable",SIGFPE,186},08031{"Doublefault",SIGBUS,286},08032{"Copressorsegmentoverrun",SIGSEGV,286},08033{"InvalidTSS",SIGSEGV,286},08034{"Segmentnotpresent",SIGSEGV,286},MINIXSOURCECODEFile:kernel/exception.
c59508035{"Stackexception",SIGSEGV,286},/*STACK_FAULTalreadyused*/08036{"Generalprotection",SIGSEGV,286},08037{"Pagefault",SIGSEGV,386},/*notclose*/08038{NIL_PTR,SIGILL,0},/*probablysoftwaretrap*/08039{"Coprocessorerror",SIGFPE,386},08040};08041registerstructex_s*ep;08042structproc*saved_proc;0804308044/*Saveproc_ptr,becauseitmaybechangedbydebugstatements.
*/08045saved_proc=proc_ptr;0804608047ep=&ex_data[vec_nr];0804808049if(vec_nr==2){/*spuriousNMIonsomemachines*/08050kprintf("gotspuriousNMI\n");08051return;08052}0805308054/*Ifanexceptionoccurswhilerunningaprocess,thek_reentervariable08055*willbezero.
Exceptionsininterrupthandlersorsystemtrapswillmake08056*k_reenterlargerthanzero.
08057*/08058if(k_reenter==0&&!
iskernelp(saved_proc)){08059cause_sig(proc_nr(saved_proc),ep->signum);08060return;08061}0806208063/*Exceptioninsystemcode.
Thisisnotsupposedtohappen.
*/08064if(ep->msg==NIL_PTR||machine.
processorminprocessor)08065kprintf("\nIntel-reservedexception%d\n",vec_nr);08066else08067kprintf("\n%s\n",ep->msg);08068kprintf("k_reenter=%d",k_reenter);08069kprintf("process%d(%s),",proc_nr(saved_proc),saved_proc->p_name);08070kprintf("pc=%u:0x%x",(unsigned)saved_proc->p_reg.
cs,08071(unsigned)saved_proc->p_reg.
pc);0807208073panic("exceptioninakerneltask",NO_NUM);08074}kernel/i8259.
c08100/*Thisfilecontainsroutinesforinitializingthe8259interruptcontroller:08101*put_irq_handler:registeraninterrupthandler08102*rm_irq_handler:deregisteraninterrupthandler08103*intr_handle:handleahardwareinterrupt08104*intr_init:initializetheinterruptcontroller(s)08105*/0810608107#include"kernel.
h"08108#include"proc.
h"08109#include596File:kernel/i8259.
cMINIXSOURCECODE0811008111#defineICW1_AT0x11/*edgetriggered,cascade,needICW4*/08112#defineICW1_PC0x13/*edgetriggered,nocascade,needICW4*/08113#defineICW1_PS0x19/*leveltriggered,cascade,needICW4*/08114#defineICW4_AT_SLAVE0x01/*notSFNM,notbuffered,normalEOI,8086*/08115#defineICW4_AT_MASTER0x05/*notSFNM,notbuffered,normalEOI,8086*/08116#defineICW4_PC_SLAVE0x09/*notSFNM,buffered,normalEOI,8086*/08117#defineICW4_PC_MASTER0x0D/*notSFNM,buffered,normalEOI,8086*/0811808119#defineset_vec(nr,addr)((void)0)081200812108122*intr_init*0812308124PUBLICvoidintr_init(mine)08125intmine;08126{08127/*Initializethe8259s,finishingwithallinterruptsdisabled.
Thisis08128*onlydoneinprotectedmode,inrealmodewedon'ttouchthe8259s,but08129*usetheBIOSlocationsinstead.
Theflag"mine"issetifthe8259sare08130*tobeprogrammedforMINIX,ortoberesettowhattheBIOSexpects.
08131*/08132inti;0813308134intr_disable();0813508136/*TheATandnewerPS/2havetwointerruptcontrollers,onemaster,08137*oneslavedatIRQ2.
(Wedon'thavetodealwiththePCthat08138*hasjustonecontroller,becauseitmustruninrealmode.
)08139*/08140outb(INT_CTL,machine.
ps_mcaICW1_PS:ICW1_AT);08141outb(INT_CTLMASK,mineIRQ0_VECTOR:BIOS_IRQ0_VEC);08142/*ICW2formaster*/08143outb(INT_CTLMASK,(1=NR_IRQ_VECTORS)08172panic("invalidcalltoput_irq_handler",irq);0817308174line=&irq_handlers[irq];08175id=1;08176while(*line!
=NULL){08177if(hook==*line)return;/*extrainitialization*/08178line=&(*line)->next;08179idnext=NULL;08184hook->handler=handler;08185hook->irq=irq;08186hook->id=id;08187*line=hook;0818808189irq_use|=1irq;08200intid=hook->id;08201irq_hook_t**line;0820208203if(irq=NR_IRQ_VECTORS)08204panic("invalidcalltorm_irq_handler",irq);0820508206line=&irq_handlers[irq];08207while(*line!
=NULL){08208if((*line)->id==id){08209(*line)=(*line)->next;08210if(!
irq_handlers[irq])irq_use&=(1next;08214}08215/*Whenthehandlerisnotfound,normallyreturnhere.
*/08216}0821808219*intr_handle*0822008221PUBLICvoidintr_handle(hook)08222irq_hook_t*hook;08223{08224/*Calltheinterrupthandlersforaninterruptwiththegivenhooklist.
08225*TheassemblypartofthehandlerhasalreadymaskedtheIRQ,reenabledthe08226*controller(s)andenabledinterrupts.
08227*/0822808229/*CalllistofhandlersforanIRQ.
*/598File:kernel/i8259.
cMINIXSOURCECODE08230while(hook!
=NULL){08231/*Foreachhandlerinthelist,markitactivebysettingitsIDbit,08232*callthefunction,andunmarkitifthefunctionreturnstrue.
08233*/08234irq_actids[hook->irq]|=hook->id;08235if((*hook->handler)(hook))irq_actids[hook->irq]&=hook->id;08236hook=hook->next;08237}0823808239/*Theassemblycodewillnowdisableinterrupts,unmasktheIRQifandonly08240*ifallactiveIDbitsarecleared,andrestartaprocess.
08241*/08242}kernel/protect.
c08300/*Thisfilecontainscodeforinitializationofprotectedmode,toinitialize08301*codeanddatasegmentdescriptors,andtoinitializeglobaldescriptors08302*forlocaldescriptorsintheprocesstable.
08303*/0830408305#include"kernel.
h"08306#include"proc.
h"08307#include"protect.
h"0830808309#defineINT_GATE_TYPE(INT_286_GATE|DESC_386_BIT)08310#defineTSS_TYPE(AVL_286_TSS|DESC_386_BIT)0831108312structdesctableptr_s{08313charlimit[sizeof(u16_t)];08314charbase[sizeof(u32_t)];/*reallyu24_t+padfor286*/08315};0831608317structgatedesc_s{08318u16_toffset_low;08319u16_tselector;08320u8_tpad;/*|000|XXXXX|ig&trpg,|XXXXXXXX|taskg*/08321u8_tp_dpl_type;/*|P|DL|0|TYPE|*/08322u16_toffset_high;08323};0832408325structtss_s{08326reg_tbacklink;08327reg_tsp0;/*stackpointertouseduringinterrupt*/08328reg_tss0;/*"segment08329reg_tsp1;08330reg_tss1;08331reg_tsp2;08332reg_tss2;08333reg_tcr3;08334reg_tip;08335reg_tflags;08336reg_tax;08337reg_tcx;08338reg_tdx;08339reg_tbx;MINIXSOURCECODEFile:kernel/protect.
c59908340reg_tsp;08341reg_tbp;08342reg_tsi;08343reg_tdi;08344reg_tes;08345reg_tcs;08346reg_tss;08347reg_tds;08348reg_tfs;08349reg_tgs;08350reg_tldt;08351u16_ttrap;08352u16_tiobase;08353/*u8_tiomap[0];*/08354};0835508356PUBLICstructsegdesc_sgdt[GDT_SIZE];/*usedinklib.
sandmpx.
s*/08357PRIVATEstructgatedesc_sidt[IDT_SIZE];/*zero-initsononepresent*/08358PUBLICstructtss_stss;/*zeroinit*/0835908360FORWARD_PROTOTYPE(voidint_gate,(unsignedvec_nr,vir_bytesoffset,08361unsigneddpl_type));08362FORWARD_PROTOTYPE(voidsdesc,(structsegdesc_s*segdp,phys_bytesbase,08363vir_bytessize));083640836508366*prot_init*0836708368PUBLICvoidprot_init()08369{08370/*Setuptablesforprotectedmode.
08371*AllGDTslotsareallocatedatcompiletime.
08372*/08373structgate_table_s*gtp;08374structdesctableptr_s*dtp;08375unsignedldt_index;08376registerstructproc*rp;0837708378staticstructgate_table_s{08379_PROTOTYPE(void(*gate),(void));08380unsignedcharvec_nr;08381unsignedcharprivilege;08382}08383gate_table[]={08384{divide_error,DIVIDE_VECTOR,INTR_PRIVILEGE},08385{single_step_exception,DEBUG_VECTOR,INTR_PRIVILEGE},08386{nmi,NMI_VECTOR,INTR_PRIVILEGE},08387{breakpoint_exception,BREAKPOINT_VECTOR,USER_PRIVILEGE},08388{overflow,OVERFLOW_VECTOR,USER_PRIVILEGE},08389{bounds_check,BOUNDS_VECTOR,INTR_PRIVILEGE},08390{inval_opcode,INVAL_OP_VECTOR,INTR_PRIVILEGE},08391{copr_not_available,COPROC_NOT_VECTOR,INTR_PRIVILEGE},08392{double_fault,DOUBLE_FAULT_VECTOR,INTR_PRIVILEGE},08393{copr_seg_overrun,COPROC_SEG_VECTOR,INTR_PRIVILEGE},08394{inval_tss,INVAL_TSS_VECTOR,INTR_PRIVILEGE},08395{segment_not_present,SEG_NOT_VECTOR,INTR_PRIVILEGE},08396{stack_exception,STACK_FAULT_VECTOR,INTR_PRIVILEGE},08397{general_protection,PROTECTION_VECTOR,INTR_PRIVILEGE},08398{page_fault,PAGE_FAULT_VECTOR,INTR_PRIVILEGE},08399{copr_error,COPROC_ERR_VECTOR,INTR_PRIVILEGE},600File:kernel/protect.
cMINIXSOURCECODE08400{hwint00,VECTOR(0),INTR_PRIVILEGE},08401{hwint01,VECTOR(1),INTR_PRIVILEGE},08402{hwint02,VECTOR(2),INTR_PRIVILEGE},08403{hwint03,VECTOR(3),INTR_PRIVILEGE},08404{hwint04,VECTOR(4),INTR_PRIVILEGE},08405{hwint05,VECTOR(5),INTR_PRIVILEGE},08406{hwint06,VECTOR(6),INTR_PRIVILEGE},08407{hwint07,VECTOR(7),INTR_PRIVILEGE},08408{hwint08,VECTOR(8),INTR_PRIVILEGE},08409{hwint09,VECTOR(9),INTR_PRIVILEGE},08410{hwint10,VECTOR(10),INTR_PRIVILEGE},08411{hwint11,VECTOR(11),INTR_PRIVILEGE},08412{hwint12,VECTOR(12),INTR_PRIVILEGE},08413{hwint13,VECTOR(13),INTR_PRIVILEGE},08414{hwint14,VECTOR(14),INTR_PRIVILEGE},08415{hwint15,VECTOR(15),INTR_PRIVILEGE},08416{s_call,SYS386_VECTOR,USER_PRIVILEGE},/*386systemcall*/08417{level0_call,LEVEL0_VECTOR,TASK_PRIVILEGE},08418};0841908420/*BuildgdtandidtpointersinGDTwheretheBIOSexpectsthem.
*/08421dtp=(structdesctableptr_s*)&gdt[GDT_INDEX];08422*(u16_t*)dtp->limit=(sizeofgdt)-1;08423*(u32_t*)dtp->base=vir2phys(gdt);0842408425dtp=(structdesctableptr_s*)&gdt[IDT_INDEX];08426*(u16_t*)dtp->limit=(sizeofidt)-1;08427*(u32_t*)dtp->base=vir2phys(idt);0842808429/*Buildsegmentdescriptorsfortasksandinterrupthandlers.
*/08430init_codeseg(&gdt[CS_INDEX],08431kinfo.
code_base,kinfo.
code_size,INTR_PRIVILEGE);08432init_dataseg(&gdt[DS_INDEX],08433kinfo.
data_base,kinfo.
data_size,INTR_PRIVILEGE);08434init_dataseg(&gdt[ES_INDEX],0L,0,TASK_PRIVILEGE);0843508436/*Buildscratchdescriptorsforfunctionsinklib88.
*/08437init_dataseg(&gdt[DS_286_INDEX],0L,0,TASK_PRIVILEGE);08438init_dataseg(&gdt[ES_286_INDEX],0L,0,TASK_PRIVILEGE);0843908440/*BuildlocaldescriptorsinGDTforLDT'sinprocesstable.
08441*TheLDT'sareallocatedatcompiletimeintheprocesstable,and08442*initializedwheneveraprocess'mapisinitializedorchanged.
08443*/08444for(rp=BEG_PROC_ADDR,ldt_index=FIRST_LDT_INDEX;08445rpp_ldt),08447sizeof(rp->p_ldt),INTR_PRIVILEGE);08448gdt[ldt_index].
access=PRESENT|LDT;08449rp->p_ldt_sel=ldt_index*DESC_SIZE;08450}0845108452/*BuildmainTSS.
08453*Thisisusedonlytorecordthestackpointertobeusedafteran08454*interrupt.
08455*Thepointerissetupsothataninterruptautomaticallysavesthe08456*currentprocess'sregistersip:cs:f:sp:ssinthecorrectslotsinthe08457*processtable.
08458*/08459tss.
ss0=DS_SELECTOR;MINIXSOURCECODEFile:kernel/protect.
c60108460init_dataseg(&gdt[TSS_INDEX],vir2phys(&tss),sizeof(tss),INTR_PRIVILEGE);08461gdt[TSS_INDEX].
access=PRESENT|(INTR_PRIVILEGEvec_nr,(vir_bytes)gtp->gate,08467PRESENT|INT_GATE_TYPE|(gtp->privilegeaccess=(privilegeCCESSED=0*/08488}0849008491*init_dataseg*0849208493PUBLICvoidinit_dataseg(segdp,base,size,privilege)08494registerstructsegdesc_s*segdp;08495phys_bytesbase;08496vir_bytessize;08497intprivilege;08498{08499/*Builddescriptorforadatasegment.
*/08500sdesc(segdp,base,size);08501segdp->access=(privilegeCCESSED=0*/08503}0850508506*sdesc*0850708508PRIVATEvoidsdesc(segdp,base,size)08509registerstructsegdesc_s*segdp;08510phys_bytesbase;08511vir_bytessize;08512{08513/*Fillinthesizefields(base,limitandgranularity)ofadescriptor.
*/08514segdp->base_low=base;08515segdp->base_middle=base>>BASE_MIDDLE_SHIFT;08516segdp->base_high=base>>BASE_HIGH_SHIFT;0851708518--size;/*converttoalimit,0sizemeans4G*/08519if(size>BYTE_GRAN_MAX){602File:kernel/protect.
cMINIXSOURCECODE08520segdp->limit_low=size>>PAGE_GRAN_SHIFT;08521segdp->granularity=GRANULAR|(size>>08522(PAGE_GRAN_SHIFT+GRANULARITY_SHIFT));08523}else{08524segdp->limit_low=size;08525segdp->granularity=size>>GRANULARITY_SHIFT;08526}08527segdp->granularity|=DEFAULT;/*meansBIGfordataseg*/08528}0853008531*seg2phys*0853208533PUBLICphys_bytesseg2phys(seg)08534U16_tseg;08535{08536/*Returnthebaseaddressofasegment,withsegbeingeithera8086segment08537*register,ora286/386segmentselector.
08538*/08539phys_bytesbase;08540structsegdesc_s*segdp;0854108542if(!
machine.
protected){08543base=hclick_to_physb(seg);08544}else{08545segdp=&gdt[seg>>3];08546base=((u32_t)segdp->base_lowbase_middlebase_highoffset_low=offset;08581idp->selector=CS_SELECTOR;08582idp->p_dpl_type=dpl_type;08583idp->offset_high=offset>>OFFSET_HIGH_SHIFT;08584}0858608587*enable_iop*0858808589PUBLICvoidenable_iop(pp)08590structproc*pp;08591{08592/*AllowauserprocesstouseI/Oinstructions.
ChangetheI/OPermission08593*Levelbitsinthepsw.
Thesespecifyleast-privilegedCurrentPermission08594*LevelallowedtoexecuteI/Oinstructions.
UsersandservershaveCPL3.
08595*Youcan'thavelessprivilegethanthat.
KernelhasCPL0,tasksCPL1.
08596*/08597pp->p_reg.
psw|=0x3000;08598}0860008601*alloc_segments*0860208603PUBLICvoidalloc_segments(rp)08604registerstructproc*rp;08605{08606/*Thisiscalledatsysteminitializationfrommain()andbydo_newmap().
08607*Thecodehasaseparatefunctionbecauseofallhardware-dependencies.
08608*NotethatIDLEispartofthekernelandgetsTASK_PRIVILEGEhere.
08609*/08610phys_bytescode_bytes;08611phys_bytesdata_bytes;08612intprivilege;0861308614if(machine.
protected){08615data_bytes=(phys_bytes)(rp->p_memmap[S].
mem_vir+08616rp->p_memmap[S].
mem_len)p_memmap[T].
mem_len==0)08618code_bytes=data_bytes;/*commonI&D,poorprotect*/08619else08620code_bytes=(phys_bytes)rp->p_memmap[T].
mem_lenp_ldt[CS_LDT_INDEX],08623(phys_bytes)rp->p_memmap[T].
mem_physp_ldt[DS_LDT_INDEX],08626(phys_bytes)rp->p_memmap[D].
mem_physp_reg.
cs=(CS_LDT_INDEX*DESC_SIZE)|TI|privilege;08629rp->p_reg.
gs=08630rp->p_reg.
fs=08631rp->p_reg.
ss=08632rp->p_reg.
es=08633rp->p_reg.
ds=(DS_LDT_INDEX*DESC_SIZE)|TI|privilege;08634}else{08635rp->p_reg.
cs=click_to_hclick(rp->p_memmap[T].
mem_phys);08636rp->p_reg.
ss=08637rp->p_reg.
es=08638rp->p_reg.
ds=click_to_hclick(rp->p_memmap[D].
mem_phys);08639}604File:kernel/protect.
cMINIXSOURCECODE08640}kernel/klib.
s08700#08701!
Choosesbetweenthe8086and386versionsofthelowlevelkernelcode.
0870208703#include08704#if_WORD_SIZE==208705#include"klib88.
s"08706#else08707#include"klib386.
s"08708#endifkernel/klib386.
s08800#08801!
sections0880208803.
sect.
text;.
sect.
rom;.
sect.
data;.
sect.
bss0880408805#include08806#include08807#include"const.
h"08808#include"sconst.
h"08809#include"protect.
h"0881008811!
Thisfilecontainsanumberofassemblycodeutilityroutinesneededbythe08812!
kernel.
Theyare:0881308814.
define_monitor!
exitMinixandreturntothemonitor08815.
define_int86!
letthemonitormakean8086interruptcall08816.
define_cp_mess!
copiesmessagesfromsourcetodestination08817.
define_exit!
dummyforlibraryroutines08818.
define__exit!
dummyforlibraryroutines08819.
define___exit!
dummyforlibraryroutines08820.
define___main!
dummyforGCC08821.
define_phys_insw!
transferdatafrom(diskcontroller)porttomemory08822.
define_phys_insb!
likewisebytebybyte08823.
define_phys_outsw!
transferdatafrommemoryto(diskcontroller)port08824.
define_phys_outsb!
likewisebytebybyte08825.
define_enable_irq!
enableanirqatthe8259controller08826.
define_disable_irq!
disableanirq08827.
define_phys_copy!
copydatafromanywheretoanywhereinmemory08828.
define_phys_memset!
writepatternanywhereinmemory08829.
define_mem_rdw!
copyonewordfrom[segment:offset]08830.
define_reset!
resetthesystem08831.
define_idle_task!
taskexecutedwhenthereisnowork08832.
define_level0!
callafunctionatlevel008833.
define_read_tsc!
readthecyclecounter(Pentiumandup)08834.
define_read_cpu_flags!
readthecpuflagsMINIXSOURCECODEFile:kernel/klib386.
s6050883508836!
TheroutinesonlyguaranteetopreservetheregisterstheCcompiler08837!
expectstobepreserved(ebx,esi,edi,ebp,esp,segmentregisters,and08838!
directionbitintheflags).
0883908840.
sect.
text0884108842!
*monitor*0884308844!
PUBLICvoidmonitor();08845!
Returntothemonitor.
0884608847_monitor:08848movesp,(_mon_sp)!
restoremonitorstackpointer08849o16movdx,SS_SELECTOR!
monitordatasegment08850movds,dx08851moves,dx08852movfs,dx08853movgs,dx08854movss,dx08855popedi08856popesi08857popebp08858o16retf!
returntothemonitor08859088600886108862!
*int86*0886308864!
PUBLICvoidint86();08865_int86:08866cmpb(_mon_return),0!
isthemonitorthere08867jnz0f08868movbah,0x01!
anint13errorseemsappropriate08869movb(_reg86+0),ah!
reg86.
w.
f=1(setcarryflag)08870movb(_reg86+13),ah!
reg86.
b.
ah=0x01="invalidcommand"08871ret088720:pushebp!
saveCregisters08873pushesi08874pushedi08875pushebx08876pushf!
saveflags08877cli!
nointerruptions0887808879inbINT2_CTLMASK08880movbah,al08881inbINT_CTLMASK08882pusheax!
saveinterruptmasks08883moveax,(_irq_use)!
mapofin-useIRQ's08884andeax,[1irqirq]&=hook->id)==0)09124!
outb(INT_CTLMASK,inb(INT_CTLMASK)&(1=8attheslave8259091440:inbdx09145andbal,ah09146outbdx!
clearbitatthe825909147en_done:popf09148leave09149ret09150091510915209153!
*disable_irq*0915409155!
PUBLICintdisable_irq(irq_hook_t*hook)09156!
Disableaninterruptrequestlinebysettingan8259bit.
09157!
EquivalentCcodeforirqirq]|=hook->id;09159!
outb(INT_CTLMASK,inb(INT_CTLMASK)|(1=8attheslave8259091780:inbdx09179testbal,ah09180jnzdis_already!
alreadydisabled09181orbal,ah09182outbdx!
setbitatthe825909183moveax,1!
disabledbythisfunction09184popf09185leave09186ret09187dis_already:09188xoreax,eax!
alreadydisabled09189popf09190leave09191ret0919209193MINIXSOURCECODEFile:kernel/klib386.
s6110919409195!
*phys_copy*0919609197!
PUBLICvoidphys_copy(phys_bytessource,phys_bytesdestination,09198!
phys_bytesbytecount);09199!
Copyablockofphysicalmemory.
0920009201PC_ARGS=4+4+4+4!
4+4+409202!
esediesieipsrcdstlen0920309204.
align1609205_phys_copy:09206cld09207pushesi09208pushedi09209pushes0921009211moveax,FLAT_DS_SELECTOR09212moves,ax0921309214movesi,PC_ARGS(esp)09215movedi,PC_ARGS+4(esp)09216moveax,PC_ARGS+4+4(esp)0921709218cmpeax,10!
avoidalignoverheadforsmallcounts09219jbpc_small09220movecx,esi!
alignsource,hopetargetistoo09221negecx09222andecx,3!
countforalignment09223subeax,ecx09224rep09225esegmovsb09226movecx,eax09227shrecx,2!
countofdwords09228rep09229esegmovs09230andeax,309231pc_small:09232xchgecx,eax!
remainder09233rep09234esegmovsb0923509236popes09237popedi09238popesi09239ret092400924109242!
*phys_memset*0924309244!
PUBLICvoidphys_memset(phys_bytessource,unsignedlongpattern,09245!
phys_bytesbytecount);09246!
Fillablockofphysicalmemorywithpattern.
0924709248.
align1609249_phys_memset:09250pushebp09251movebp,esp09252pushesi09253pushebx612File:kernel/klib386.
sMINIXSOURCECODE09254pushds09255movesi,8(ebp)09256moveax,16(ebp)09257movebx,FLAT_DS_SELECTOR09258movds,bx09259movebx,12(ebp)09260shreax,209261fill_start:09262mov(esi),ebx09263addesi,409264deceax09265jnzfill_start09266!
Anyremainingbytes09267moveax,16(ebp)09268andeax,309269remain_fill:09270cmpeax,009271jzfill_done09272movbbl,12(ebp)09273movb(esi),bl09274addesi,109275incebp09276deceax09277jmpremain_fill09278fill_done:09279popds09280popebx09281popesi09282popebp09283ret092840928509286!
*mem_rdw*0928709288!
PUBLICu16_tmem_rdw(U16_tsegment,u16_t*offset);09289!
Loadandreturnwordatfarpointersegment:offset.
0929009291.
align1609292_mem_rdw:09293movcx,ds09294movds,4(esp)!
segment09295moveax,4+4(esp)!
offset09296movzxeax,(eax)!
wordtoreturn09297movds,cx09298ret09299093000930109302!
*reset*0930309304!
PUBLICvoidreset();09305!
ResetthesystembyloadingIDTwithoffset0andinterrupting.
0930609307_reset:09308lidt(idt_zero)09309int3!
anythinggoes,the386willnotlikeit09310.
sect.
data09311idt_zero:.
data40,009312.
sect.
text09313MINIXSOURCECODEFile:kernel/klib386.
s613093140931509316!
*idle_task*0931709318_idle_task:09319!
Thistaskiscalledwhenthesystemhasnothingelsetodo.
TheHLT09320!
instructionputstheprocessorinastatewhereitdrawsminimumpower.
09321pushhalt09322call_level0!
level0(halt)09323popeax09324jmp_idle_task09325halt:09326sti09327hlt09328cli09329ret093300933109332!
*level0*0933309334!
PUBLICvoidlevel0(void(*func)(void))09335!
Callafunctionatpermissionlevel0.
Thisallowskerneltaskstodo09336!
thingsthatareonlypossibleatthemostprivilegedCPUlevel.
09337!
09338_level0:09339moveax,4(esp)09340mov(_level0_func),eax09341intLEVEL0_VECTOR09342ret09343093440934509346!
*read_tsc*0934709348!
PUBLICvoidread_tsc(unsignedlong*high,unsignedlong*low);09349!
ReadthecyclecounteroftheCPU.
Pentiumandup.
09350.
align1609351_read_tsc:09352.
data10x0f!
thisistheRDTSCinstruction09353.
data10x31!
itplacestheTSCinEDX:EAX09354pushebp09355movebp,8(esp)09356mov(ebp),edx09357movebp,12(esp)09358mov(ebp),eax09359popebp09360ret093610936209363!
*read_flags*0936409365!
PUBLICunsignedlongread_cpu_flags(void);09366!
ReadCPUstatusflagsfromC.
09367.
align1609368_read_cpu_flags:09369pushf09370moveax,(esp)09371popf09372ret09373614File:kernel/utility.
cMINIXSOURCECODEkernel/utility.
c09400/*Thisfilecontainsacollectionofmiscellaneousprocedures:09401*panic:abortMINIXduetoafatalerror09402*kprintf:diagnosticoutputforthekernel09403*09404*Changes:09405*Dec10,2004kernelprintingtocircularbuffer(JorritN.
Herder)09406*09407*Thisfilecontainstheroutinesthattakecareofkernelmessages,i.
e.
,09408*diagnosticoutputwithinthekernel.
Kernelmessagesarenotdirectly09409*displayedontheconsole,becausethismustbedonebytheoutputdriver.
09410*Instead,thekernelaccumulatescharactersinabufferandnotifiesthe09411*outputdriverwhenanewmessageisready.
09412*/0941309414#include09415#include"kernel.
h"09416#include09417#include09418#include09419#include09420#include09421#include"proc.
h"0942209423#defineEND_OF_KMESS-109424FORWARD_PROTOTYPE(voidkputc,(intc));094250942609427*panic*0942809429PUBLICvoidpanic(mess,nr)09430_CONSTchar*mess;09431intnr;09432{09433/*Thesystemhasrunagroundofafatalkernelerror.
Terminateexecution.
*/09434staticintpanicking=0;09435if(panicking++)return;/*preventrecursivepanics*/0943609437if(mess!
=NULL){09438kprintf("\nKernelpanic:%s",mess);09439if(nr!
=NO_NUM)kprintf("%d",nr);09440kprintf("\n",NO_NUM);09441}0944209443/*AbortMINIX.
*/09444prepare_shutdown(RBT_PANIC);09445}0944709448*kprintf*0944909450PUBLICvoidkprintf(constchar*fmt,formattobeprinted*/09451{09452intc;/*nextcharacterinfmt*/09453intd;09454unsignedlongu;/*holdnumberargument*/MINIXSOURCECODEFile:kernel/utility.
c61509455intbase;/*baseofnumberarg*/09456intnegative=0;/*printminussign*/09457staticcharx2c[]="0123456789ABCDEF";/*nrconversiontable*/09458charascii[8*sizeof(long)/3+2];/*stringforasciinumber*/09459char*s=NULL;/*stringtobeprinted*/09460va_listargp;/*optionalarguments*/0946109462va_start(argp,fmt);/*initvariablearguments*/0946309464while((c=*fmt++)!
=0){0946509466if(cexpectformat'%key'*/09467switch(c=*fmt+determinewhattodo*/0946809469/*Knownkeysare%d,%u,%x,%s,and%%.
Thisiseasilyextended09470*withnumbertypeslike%band%obyprovidingadifferentbase.
09471*Numbertypekeysdon'tsetastringto's',butusethegeneral09472*conversionaftertheswitchstatement.
09473*/09474case'd':/*outputdecimal*/09475d=va_arg(argp,signedint);09476if(d0);09507}0950809509/*Thisiswheretheactualoutputforformat"%key"isdone.
*/09510if(negative)kputc(printsignifnegative*/09511while(*s!
=0){kputc(*s+printstring/number*/09512s=NULL;/*resetfornextround*/09513}09514else{616File:kernel/utility.
cMINIXSOURCECODE09515kputc(c);/*printandcontinue*/09516}09517}09518kputc(END_OF_KMESS);/*terminateoutput*/09519va_end(argp);/*endvariablearguments*/09520}0952209523*kputc*0952409525PRIVATEvoidkputc(c)09526intc;/*charactertoappend*/09527{09528/*Accumulateasinglecharacterforakernelmessage.
Sendanotification09529*totheoutputdriverifanEND_OF_KMESSisencountered.
09530*/09531if(c!
=END_OF_KMESS){09532kmess.
km_buf[kmess.
km_next]=c;/*putnormalcharinbuffer*/09533if(kmess.
km_sizeccesstosystemservicesbydoingakernelcall.
09604*KernelcallsaretransformedintorequestmessagestotheSYStaskthatis09605*responsibleforhandlingthecall.
Byconvention,sys_call()istransformed09606*intoamessagewithtypeSYS_CALLthatishandledinafunctiondo_call().
09607*/0960809609#ifndefSYSTEM_H09610#defineSYSTEM_H0961109612/*Commonincludesforthesystemlibrary.
*/09613#include"kernel.
h"09614#include"proto.
h"09615#include"proc.
h"0961609617/*Defaulthandlerforunusedkernelcalls.
*/09618_PROTOTYPE(intdo_unused,(message*m_ptr));09619_PROTOTYPE(intdo_exec,(message*m_ptr));09620_PROTOTYPE(intdo_fork,(message*m_ptr));09621_PROTOTYPE(intdo_newmap,(message*m_ptr));09622_PROTOTYPE(intdo_exit,(message*m_ptr));09623_PROTOTYPE(intdo_trace,(message*m_ptr));09624_PROTOTYPE(intdo_nice,(message*m_ptr));MINIXSOURCECODEFile:kernel/system.
h61709625_PROTOTYPE(intdo_copy,(message*m_ptr));09626#definedo_vircopydo_copy09627#definedo_physcopydo_copy09628_PROTOTYPE(intdo_vcopy,(message*m_ptr));09629#definedo_virvcopydo_vcopy09630#definedo_physvcopydo_vcopy09631_PROTOTYPE(intdo_umap,(message*m_ptr));09632_PROTOTYPE(intdo_memset,(message*m_ptr));09633_PROTOTYPE(intdo_abort,(message*m_ptr));09634_PROTOTYPE(intdo_getinfo,(message*m_ptr));09635_PROTOTYPE(intdo_privctl,(message*m_ptr));09636_PROTOTYPE(intdo_segctl,(message*m_ptr));09637_PROTOTYPE(intdo_irqctl,(message*m_ptr));09638_PROTOTYPE(intdo_devio,(message*m_ptr));09639_PROTOTYPE(intdo_vdevio,(message*m_ptr));09640_PROTOTYPE(intdo_int86,(message*m_ptr));09641_PROTOTYPE(intdo_sdevio,(message*m_ptr));09642_PROTOTYPE(intdo_kill,(message*m_ptr));09643_PROTOTYPE(intdo_getksig,(message*m_ptr));09644_PROTOTYPE(intdo_endksig,(message*m_ptr));09645_PROTOTYPE(intdo_sigsend,(message*m_ptr));09646_PROTOTYPE(intdo_sigreturn,(message*m_ptr));09647_PROTOTYPE(intdo_times,(message*m_ptr));09648_PROTOTYPE(intdo_setalarm,(message*m_ptr));0964909650#endif/*SYSTEM_H*/096510965209653kernel/system.
c09700/*Thistaskprovidesaninterfacebetweenthekernelanduser-spacesystem09701*processes.
Systemservicescanbeaccessedbydoingakernelcall.
Kernel09702*callsaretransformedintorequestmessages,whicharehandledbythis09703*task.
Byconvention,asys_call()istransformedinaSYS_CALLrequest09704*messagethatishandledinafunctionnameddo_call().
09705*09706*Aprivatecallvectorisusedtomapallkernelcallstothefunctionsthat09707*handlethem.
Theactualhandlerfunctionsarecontainedinseparatefiles09708*tokeepthisfileclean.
Thecallvectorisusedinthesystemtask'smain09709*looptohandleallincomingrequests.
09710*09711*Inadditiontothemainsys_task()entrypoint,whichstartsthemainloop,09712*thereareseveralotherminorentrypoints:09713*get_priv:assignprivilegestructuretouserorsystemprocess09714*send_sig:sendasignaldirectlytoasystemprocess09715*cause_sig:takeactiontocauseasignaltooccurviaPM09716*umap_local:mapvirtualaddressinLOCAL_SEGtophysical09717*umap_remote:mapvirtualaddressinREMOTE_SEGtophysical09718*umap_bios:mapvirtualaddressinBIOS_SEGtophysical09719*virtual_copy:copybytesfromonevirtualaddresstoanother09720*get_randomness:accumulaterandomnessinabuffer09721*09722*Changes:09723*Aug04,2005checkifkernelcallisallowed(JorritN.
Herder)09724*Jul20,2005sendsignaltoserviceswithmessage(JorritN.
Herder)618File:kernel/system.
cMINIXSOURCECODE09725*Jan15,2005new,generalizedvirtualcopyfunction(JorritN.
Herder)09726*Oct10,2004dispatchsystemcallsfromcallvector(JorritN.
Herder)09727*Sep30,2004sourcecodedocumentationupdated(JorritN.
Herder)09728*/0972909730#include"kernel.
h"09731#include"system.
h"09732#include09733#include09734#include09735#include09736#include09737#include"protect.
h"0973809739/*Declarationofthecallvectorthatdefinesthemappingofkernelcalls09740*tohandlerfunctions.
Thevectorisinitializedinsys_init()withmap(),09741*whichmakessurethekernelcallnumbersareok.
Nospaceisallocated,09742*becausethedummyisdeclaredextern.
Ifanillegalcallisgiven,the09743*arraysizewillbenegativeandthiswon'tcompile.
09744*/09745PUBLICint(*call_vec[NR_SYS_CALLS])(message*m_ptr);0974609747#definemap(call_nr,handler)\09748{externintdummy[NR_SYS_CALLS>(unsigned)(call_nr-KERNEL_CALL)1:-1];}\09749call_vec[(call_nr-KERNEL_CALL)]=(handler)0975009751FORWARD_PROTOTYPE(voidinitialize,(void));097520975309754*sys_task*0975509756PUBLICvoidsys_task()09757{09758/*Mainentrypointofsys_task.
Getthemessageanddispatchontype.
*/09759staticmessagem;09760registerintresult;09761registerstructproc*caller_ptr;09762unsignedintcall_nr;09763ints;0976409765/*Initializethesystemtask.
*/09766initialize();0976709768while(TRUE){09769/*Getwork.
Blockandwaituntilarequestmessagearrives.
*/09770receive(ANY,&m);09771call_nr=(unsigned)m.
m_type-KERNEL_CALL;09772caller_ptr=proc_addr(m.
m_source);0977309774/*Seeifthecallermadeavalidrequestandtrytohandleit.
*/09775if(!
(priv(caller_ptr)->s_call_mask&(1=NR_SYS_CALLS){/*checkcallnumber*/09779kprintf("SYSTEM:illegalrequest%dfrom%d.
\n",call_nr,m.
m_source);09780result=EBADREQUEST;/*illegalmessagetype*/09781}09782else{09783result=(*call_vec[call_nr])(&m);/*handlethekernelcall*/09784}MINIXSOURCECODEFile:kernel/system.
c6190978509786/*Sendareply,unlessinhibitedbyahandlerfunction.
Usethekernel09787*functionlock_send()topreventasystemcalltrap.
Thedestination09788*isknowntobeblockedwaitingforamessage.
09789*/09790if(result!
=EDONTREPLY){09791m.
m_type=result;/*reportstatusofcall*/09792if(OK!
=(s=lock_send(m.
m_source,&m))){09793kprintf("SYSTEM,replyto%dfailed:%d\n",m.
m_source,s);09794}09795}09796}09797}0979909800*initialize*0980109802PRIVATEvoidinitialize(void)09803{09804registerstructpriv*sp;09805inti;0980609807/*InitializeIRQhandlerhooks.
Markallhooksavailable.
*/09808for(i=0;is_alarm_timer));09815}0981609817/*Initializethecallvectortoasafedefaulthandler.
Somekernelcalls09818*maybedisabledornonexistant.
Thenexplicitlymapknowncallstotheir09819*handlerfunctions.
Thisisdonewithamacrothatgivesacompileerror09820*ifanillegalcallnumberisused.
Theorderingisnotimportanthere.
09821*/09822for(i=0;is_proc_nr==NONE&&sp->s_id!
=USER_PRIV_ID)break;09884if(sp->s_proc_nr!
=NONE)return(ENOSPC);09885rc->p_priv=sp;/*assignnewslot*/09886rc->p_priv->s_proc_nr=proc_nr(rc);/*setassociation*/09887rc->p_priv->s_flags=SYS_PROC;/*markasprivileged*/09888}else{09889rc->p_priv=&priv[USER_PRIV_ID];/*usesharedslot*/09890rc->p_priv->s_proc_nr=INIT_PROC_NR;/*setassociation*/09891rc->p_priv->s_flags=0;/*noinitialflags*/09892}09893return(OK);09894}0989609897*get_randomness*0989809899PUBLICvoidget_randomness(source)09900intsource;09901{09902/*OnmachineswiththeRDTSC(cyclecounterreadinstruction-pentium09903*andup),usethatforhigh-resolutionrawentropygathering.
Otherwise,09904*usetherealtimeclock(tickresolution).
MINIXSOURCECODEFile:kernel/system.
c62109905*09906*Unfortunatelythistestisrun-time-wedon'twanttobotherwith09907*compilingdifferentkernelsfordifferentmachines.
09908*09909*OnmachineswithoutRDTSC,weuseread_clock().
09910*/09911intr_next;09912unsignedlongtsc_high,tsc_low;0991309914source%=RANDOM_SOURCES;09915r_next=krandom.
bin[source].
r_next;09916if(machine.
processor>486){09917read_tsc(&tsc_high,&tsc_low);09918krandom.
bin[source].
r_buf[r_next]=tsc_low;09919}else{09920krandom.
bin[source].
r_buf[r_next]=read_clock();09921}09922if(krandom.
bin[source].
r_sizes_sig_pending,sig_nr);09943lock_notify(SYSTEM,proc_nr);09944}0994609947*cause_sig*0994809949PUBLICvoidcause_sig(proc_nr,sig_nr)09950intproc_nr;/*processtobesignalled*/09951intsig_nr;/*signaltobesent,1to_NSIG*/09952{09953/*Asystemprocesswantstosendasignaltoaprocess.
Examplesare:09954*-HARDWAREwantingtocauseaSIGSEGVafteraCPUexception09955*-TTYwantingtocauseSIGINTupongettingaDEL09956*-FSwantingtocauseSIGPIPEforabrokenpipe09957*SignalsarehandledbysendingamessagetoPM.
Thisfunctionhandlesthe09958*signalsandmakessurethePMgetsthembysendinganotification.
The09959*processbeingsignaledisblockedwhilePMhasnotfinishedallsignals09960*forit.
09961*Raceconditionsbetweencallstothisfunctionandthesystemcallsthat09962*processpendingkernelsignalscannotexist.
Signalrelatedfunctionsare09963*onlycalledwhenauserprocesscausesaCPUexceptionandfromthekernel09964*processlevel,whichrunstocompletion.
622File:kernel/system.
cMINIXSOURCECODE09965*/09966registerstructproc*rp;0996709968/*Checkifthesignalisalreadypending.
Processitotherwise.
*/09969rp=proc_addr(proc_nr);09970if(!
sigismember(&rp->p_pending,sig_nr)){09971sigaddset(&rp->p_pending,sig_nr);09972if(!
(rp->p_rts_flags&SIGNALED)){/*otherpending*/09973if(rp->p_rts_flags==0)lock_dequeue(rp);/*makenotready*/09974rp->p_rts_flags|=SIGNALED|SIG_PENDING;/*updateflags*/09975send_sig(PM_PROC_NR,SIGKSIG);09976}09977}09978}0998009981*umap_local*0998209983PUBLICphys_bytesumap_local(rp,seg,vir_addr,bytes)09984registerstructproc*rp;/*pointertoproctableentryforprocess*/09985intseg;/*T,D,orSsegment*/09986vir_bytesvir_addr;/*virtualaddressinbyteswithintheseg*/09987vir_bytesbytes;/*#ofbytestobecopied*/09988{09989/*Calculatethephysicalmemoryaddressforagivenvirtualaddress.
*/09990vir_clicksvc;/*thevirtualaddressinclicks*/09991phys_bytespa;/*intermediatevariablesasphys_bytes*/09992phys_bytesseg_base;0999309994/*If'seg'isDitcouldreallybeSandviceversa.
TreallymeansT.
09995*Ifthevirtualaddressfallsinthegap,itcausesaproblem.
Onthe09996*8088itisprobablyalegalstackreference,since"stackfaults"are09997*notdetectedbythehardware.
On8088s,thegapiscalledSand09998*accepted,butonothermachinesitiscalledDandrejected.
09999*TheAtariSTbehaveslikethe8088inthisrespect.
10000*/1000110002if(bytes>CLICK_SHIFT;/*lastclickofdata*/1000510006if(seg!
=T)10007seg=(vcp_memmap[D].
mem_vir+rp->p_memmap[D].
mem_lenD:S);1000810009if((vir_addr>>CLICK_SHIFT)>=rp->p_memmap[seg].
mem_vir+10010rp->p_memmap[seg].
mem_len)return((phys_bytes)0);1001110012if(vc>=rp->p_memmap[seg].
mem_vir+10013rp->p_memmap[seg].
mem_len)return((phys_bytes)0);1001410015seg_base=(phys_bytes)rp->p_memmap[seg].
mem_phys;10016seg_base=seg_basep_memmap[seg].
mem_vir=NR_REMOTE_SEGS)return((phys_bytes)0);1003610037fm=&rp->p_priv->s_farmem[seg];10038if(!
fm->in_use)return((phys_bytes)0);10039if(vir_addr+bytes>fm->mem_len)return((phys_bytes)0);1004010041return(fm->mem_phys+(phys_bytes)vir_addr);10042}1004410045*umap_bios*1004610047PUBLICphys_bytesumap_bios(rp,vir_addr,bytes)10048registerstructproc*rp;/*pointertoproctableentryforprocess*/10049vir_bytesvir_addr;/*virtualaddressinBIOSsegment*/10050vir_bytesbytes;/*#ofbytestobecopied*/10051{10052/*CalculatethephysicalmemoryaddressattheBIOS.
Note:currently,BIOS10053*addresszero(thefirstBIOSinterruptvector)isnotconsideredasan10054*errorhere,butsincethephysicaladdresswillbezeroaswell,the10055*callingfunctionwillthinkanerroroccurred.
Thisisnotaproblem,10056*sincenooneusesthefirstBIOSinterruptvector.
10057*/1005810059/*Checkallacceptableranges.
*/10060if(vir_addr>=BIOS_MEM_BEGIN&&vir_addr+bytes=BASE_MEM_TOP&&vir_addr+bytessegment&SEGMENT_TYPE)){10094caseLOCAL_SEG:10095seg_index=vir_addr[i]->segment&SEGMENT_INDEX;10096phys_addr[i]=umap_local(proc_addr(vir_addr[i]->proc_nr),10097seg_index,vir_addr[i]->offset,bytes);10098break;10099caseREMOTE_SEG:10100seg_index=vir_addr[i]->segment&SEGMENT_INDEX;10101phys_addr[i]=umap_remote(proc_addr(vir_addr[i]->proc_nr),10102seg_index,vir_addr[i]->offset,bytes);10103break;10104caseBIOS_SEG:10105phys_addr[i]=umap_bios(proc_addr(vir_addr[i]->proc_nr),10106vir_addr[i]->offset,bytes);10107break;10108casePHYS_SEG:10109phys_addr[i]=vir_addr[i]->offset;10110break;10111default:10112return(EINVAL);10113}1011410115/*Checkifmappingsucceeded.
*/10116if(phys_addr[i]segment!
=PHYS_SEG)10117return(EFAULT);10118}1011910120/*Nowcopybytesbetweenphysicaladdresseses.
*/10121phys_copy(phys_addr[_SRC_],phys_addr[_DST_],(phys_bytes)bytes);10122return(OK);10123}kernel/system/do_setalarm.
c10200/*Thekernelcallimplementedinthisfile:10201*m_type:SYS_SETALARM10202*10203*Theparametersforthiskernelcallare:10204*m2_l1:ALRM_EXP_TIME(alarm'sexpirationtime)10205*m2_i2:ALRM_ABS_TIME(expirationtimeisabsolute)10206*m2_l1:ALRM_TIME_LEFT(returnsecondsleftofprevious)10207*/1020810209#include".
.
/system.
h"MINIXSOURCECODEFile:kernel/system/do_setalarm.
c6251021010211#ifUSE_SETALARM1021210213FORWARD_PROTOTYPE(voidcause_alarm,(timer_t*tp));102141021510216*do_setalarm*1021710218PUBLICintdo_setalarm(m_ptr)10219message*m_ptr;/*pointertorequestmessage*/10220{10221/*Aprocessrequestsasynchronousalarm,orwantstocancelitsalarm.
*/10222registerstructproc*rp;/*pointertorequestingprocess*/10223intproc_nr;/*whichprocesswantsthealarm*/10224longexp_time;/*expirationtimeforthisalarm*/10225intuse_abs_time;/*useabsoluteorrelativetime*/10226timer_t*tp;/*theprocess'timerstructure*/10227clock_tuptime;/*placeholderforcurrentuptime*/1022810229/*Extractsharedparametersfromtherequestmessage.
*/10230exp_time=m_ptr->ALRM_EXP_TIME;/*alarm'sexpirationtime*/10231use_abs_time=m_ptr->ALRM_ABS_TIME;/*flagforabsolutetime*/10232proc_nr=m_ptr->m_source;/*processtointerruptlater*/10233rp=proc_addr(proc_nr);10234if(!
(priv(rp)->s_flags&SYS_PROC))return(EPERM);1023510236/*Getthetimerstructureandsettheparametersforthisalarm.
*/10237tp=&(priv(rp)->s_alarm_timer);10238tmr_arg(tp)->ta_int=proc_nr;10239tp->tmr_func=cause_alarm;1024010241/*Returntheticksleftonthepreviousalarm.
*/10242uptime=get_uptime();10243if((tp->tmr_exp_time!
=TMR_NEVER)&&(uptimetmr_exp_time)){10244m_ptr->ALRM_TIME_LEFT=(tp->tmr_exp_time-uptime);10245}else{10246m_ptr->ALRM_TIME_LEFT=0;10247}1024810249/*Finally,(re)setthetimerdependingontheexpirationtime.
*/10250if(exp_time==0){10251reset_timer(tp);10252}else{10253tp->tmr_exp_time=(use_abs_time)exp_time:exp_time+get_uptime();10254set_timer(tp,tp->tmr_exp_time,tp->tmr_func);10255}10256return(OK);10257}1025910260*cause_alarm*1026110262PRIVATEvoidcause_alarm(tp)10263timer_t*tp;10264{10265/*Routinecalledifatimergoesoffandtheprocessrequestedasynchronous10266*alarm.
Theprocessnumberisstoredintimerargument'ta_int'.
Notifythat10267*processwithanotificationmessagefromCLOCK.
10268*/10269intproc_nr=tmr_arg(tp)->ta_int;/*getprocessnumber*/626File:kernel/system/do_setalarm.
cMINIXSOURCECODE10270lock_notify(CLOCK,proc_nr);/*notifyprocess*/10271}10273#endif/*USE_SETALARM*/kernel/system/do_exec.
c10300/*Thekernelcallimplementedinthisfile:10301*m_type:SYS_EXEC10302*10303*Theparametersforthiskernelcallare:10304*m1_i1:PR_PROC_NR(processthatdidexeccall)10305*m1_p1:PR_STACK_PTR(newstackpointer)10306*m1_p2:PR_NAME_PTR(pointertoprogramname)10307*m1_p3:PR_IP_PTR(newinstructionpointer)10308*/10309#include".
.
/system.
h"10310#include10311#include1031210313#ifUSE_EXEC103141031510316*do_exec*1031710318PUBLICintdo_exec(m_ptr)10319registermessage*m_ptr;/*pointertorequestmessage*/10320{10321/*Handlesys_exec().
AprocesshasdoneasuccessfulEXEC.
Patchitup.
*/10322registerstructproc*rp;10323reg_tsp;/*newsp*/10324phys_bytesphys_name;10325char*np;1032610327rp=proc_addr(m_ptr->PR_PROC_NR);10328sp=(reg_t)m_ptr->PR_STACK_PTR;10329rp->p_reg.
sp=sp;/*setthestackpointer*/10330phys_memset(vir2phys(&rp->p_ldt[EXTRA_LDT_INDEX]),0,10331(LDT_SIZE-EXTRA_LDT_INDEX)*sizeof(rp->p_ldt[0]));10332rp->p_reg.
pc=(reg_t)m_ptr->PR_IP_PTR;/*setpc*/10333rp->p_rts_flags&=RECEIVING;/*PMdoesnotreplytoEXECcall*/10334if(rp->p_rts_flags==0)lock_enqueue(rp);1033510336/*Savecommandnamefordebugging,ps(1)output,etc.
*/10337phys_name=numap_local(m_ptr->m_source,(vir_bytes)m_ptr->PR_NAME_PTR,10338(vir_bytes)P_NAME_LEN-1);10339if(phys_name!
=0){10340phys_copy(phys_name,vir2phys(rp->p_name),(phys_bytes)P_NAME_LEN-1);10341for(np=rp->p_name;(*np&BYTE)np++){}10342*np=0;/*markend*/10343}else{10344strncpy(rp->p_name,"",P_NAME_LEN);10345}10346return(OK);10347}10348#endif/*USE_EXEC*/MINIXSOURCECODEFile:kernel/clock.
c627kernel/clock.
c10400/*Thisfilecontainstheclocktask,whichhandlestimerelatedfunctions.
10401*ImportanteventsthatarehandledbytheCLOCKincludesettingand10402*monitoringalarmtimersanddecidingwhento(re)scheduleprocesses.
10403*TheCLOCKoffersadirectinterfacetokernelprocesses.
Systemservices10404*canaccessitsservicesthroughsystemcalls,suchassys_setalarm().
The10405*CLOCKtaskthusishiddenfromtheoutsideworld.
10406*10407*Changes:10408*Oct08,2005reorderingandcommentediting(A.
S.
Woodhull)10409*Mar18,2004clockinterfacemovedtoSYSTEMtask(JorritN.
Herder)10410*Sep30,2004sourcecodedocumentationupdated(JorritN.
Herder)10411*Sep24,2004redesignedalarmtimers(JorritN.
Herder)10412*10413*Thefunctiondo_clocktick()istriggeredbytheclock'sinterrupt10414*handlerwhenawatchdogtimerhasexpiredoraprocessmustbescheduled.
10415*10416*Inadditiontothemainclock_task()entrypoint,whichstartsthemain10417*loop,thereareseveralotherminorentrypoints:10418*clock_stop:calledjustbeforeMINIXshutdown10419*get_uptime:getrealtimesincebootinclockticks10420*set_timer:setawatchdogtimer(+)10421*reset_timer:resetawatchdogtimer(+)10422*read_clock:readthecounterofchannel0ofthe8253Atimer10423*10424*(+)TheCLOCKtaskkeepstracksofwatchdogtimersfortheentirekernel.
10425*Thewatchdogfunctionsofexpiredtimersareexecutedindo_clocktick().
10426*Itiscrucialthatwatchdogfunctionsnotblock,ortheCLOCKtaskmay10427*beblocked.
Donotsend()amessagewhenthereceiverisnotexpectingit.
10428*Instead,notify(),whichalwaysreturns,shouldbeused.
10429*/1043010431#include"kernel.
h"10432#include"proc.
h"10433#include10434#include1043510436/*FunctionprototypeforPRIVATEfunctions.
*/10437FORWARD_PROTOTYPE(voidinit_clock,(void));10438FORWARD_PROTOTYPE(intclock_handler,(irq_hook_t*hook));10439FORWARD_PROTOTYPE(intdo_clocktick,(message*m_ptr));1044010441/*Clockparameters.
*/10442#defineCOUNTER_FREQ(2*TIMER_FREQ)/*counterfrequencyusingsquarewave*/10443#defineLATCH_COUNT0x00/*cc00xxxx,c=channel,x=any*/10444#defineSQUARE_WAVE0x36/*ccaammmb,a=access,m=mode,b=BCD*/10445/*11x11,11=LSBthenMSB,x11=sqwave*/10446#defineTIMER_COUNT((unsigned)(TIMER_FREQ/HZ))/*initialvalueforcounter*/10447#defineTIMER_FREQ1193182L/*clockfrequencyfortimerinPCandAT*/1044810449#defineCLOCK_ACK_BIT0x80/*PS/2clockinterruptacknowledgebit*/1045010451/*TheCLOCK'stimersqueue.
Thefunctionsinoperateonthis.
10452*Eachsystemprocesspossessesasinglesynchronousalarmtimer.
Ifother10453*kernelpartswanttouseadditionaltimers,theymustdeclaretheirown10454*persistent(static)timerstructure,whichcanbepassedtotheclock628File:kernel/clock.
cMINIXSOURCECODE10455*via(re)set_timer().
10456*WhenatimerexpiresitswatchdogfunctionisrunbytheCLOCKtask.
10457*/10458PRIVATEtimer_t*clock_timers;/*queueofCLOCKtimers*/10459PRIVATEclock_tnext_timeout;/*realtimethatnexttimerexpires*/1046010461/*Thetimeisincrementedbytheinterrupthandleroneachclocktick.
*/10462PRIVATEclock_trealtime;/*realtimeclock*/10463PRIVATEirq_hook_tclock_hook;/*interrupthandlerhook*/104641046510466*clock_task*1046710468PUBLICvoidclock_task()10469{10470/*Mainprogramofclocktask.
IfthecallisnotHARD_INTitisanerror.
10471*/10472messagem;/*messagebufferforbothinputandoutput*/10473intresult;/*resultreturnedbythehandler*/1047410475init_clock();/*initializeclocktask*/1047610477/*Mainloopoftheclocktask.
Getwork,processit.
Neverreply.
*/10478while(TRUE){1047910480/*Gogetamessage.
*/10481receive(ANY,&m);1048210483/*Handletherequest.
Onlyclockticksareexpected.
*/10484switch(m.
m_type){10485caseHARD_INT:10486result=do_clocktick(&m);/*handleclocktick*/10487break;10488default:/*illegalrequesttype*/10489kprintf("CLOCK:illegalrequest%dfrom%d.
\n",m.
m_type,m.
m_source);10490}10491}10492}1049410495*do_clocktick*1049610497PRIVATEintdo_clocktick(m_ptr)10498message*m_ptr;/*pointertorequestmessage*/10499{10500/*Despiteitsname,thisroutineisnotcalledoneveryclocktick.
It10501*iscalledonthoseclocktickswhenalotofworkneedstobedone.
10502*/1050310504/*Aprocessusedupafullquantum.
Theinterrupthandlerstoredthis10505*processin'prev_ptr'.
Firstmakesurethattheprocessisnotonthe10506*schedulingqueues.
Thenannouncetheprocessreadyagain.
Sinceithas10507*nomoretimeleft,itgetsanewquantumandisinsertedattheright10508*placeinthequeues.
Asaside-effectanewprocesswillbescheduled.
10509*/10510if(prev_ptr->p_ticks_lefts_flags&PREEMPTIBLE){10511lock_dequeue(prev_ptr);/*takeitoffthequeues*/10512lock_enqueue(prev_ptr);/*andreinsertitagain*/10513}10514MINIXSOURCECODEFile:kernel/clock.
c62910515/*Checkifaclocktimerexpiredandrunitswatchdogfunction.
*/10516if(next_timeouttmr_exp_time;10520}1052110522/*Inhibitsendingareply.
*/10523return(EDONTREPLY);10524}1052610527*init_clock*1052810529PRIVATEvoidinit_clock()10530{10531/*InitializetheCLOCK'sinterrupthook.
*/10532clock_hook.
proc_nr=CLOCK;1053310534/*Initializechannel0ofthe8253Atimerto,e.
g.
,60Hz.
*/10535outb(TIMER_MODE,SQUARE_WAVE);/*settimertoruncontinuously*/10536outb(TIMER0,TIMER_COUNT);/*loadtimerlowbyte*/10537outb(TIMER0,TIMER_COUNT>>8);/*loadtimerhighbyte*/10538put_irq_handler(&clock_hook,CLOCK_IRQ,clock_handler);/*registerhandler*/10539enable_irq(&clock_hook);/*readyforclockinterrupts*/10540}1054210543*clock_stop*1054410545PUBLICvoidclock_stop()10546{10547/*ResettheclocktotheBIOSrate.
(Forrebooting)*/10548outb(TIMER_MODE,0x36);10549outb(TIMER0,0);10550outb(TIMER0,0);10551}1055310554*clock_handler*1055510556PRIVATEintclock_handler(hook)10557irq_hook_t*hook;10558{10559/*Thisexecutesoneachclocktick(i.
e.
,everytimethetimerchipgenerates10560*aninterrupt).
Itdoesalittlebitofworksotheclocktaskdoesnothave10561*tobecalledoneverytick.
Theclocktaskiscalledwhen:10562*10563*(1)theschedulingquantumoftherunningprocesshasexpired,or10564*(2)atimerhasexpiredandthewatchdogfunctionshouldberun.
10565*10566*Manyglobalglobalandstaticvariablesareaccessedhere.
Thesafetyof10567*thismustbejustified.
Allschedulingandmessagepassingcodeacquiresa10568*lockbytemporarilydisablinginterrupts,sonoconflictswithcallsfrom10569*thetasklevelcanoccur.
Furthermore,interruptsarenotreentrant,the10570*interrupthandlercannotbebotheredbyotherinterrupts.
10571*10572*Variablesthatareupdatedintheclock'sinterrupthandler:10573*lost_ticks:10574*Clocktickscountedoutsidetheclocktask.
Thisforexample630File:kernel/clock.
cMINIXSOURCECODE10575*isusedwhenthebootmonitorprocessesarealmodeinterrupt.
10576*realtime:10577*Thecurrentuptimeisincrementedwithalloutstandingticks.
10578*proc_ptr,bill_ptr:10579*Theseareusedforaccounting.
Itdoesnotmatterifproc.
c10580*ischangingthem,providedtheyarealwaysvalidpointers,10581*sinceatworstthepreviousprocesswouldbebilled.
10582*/10583registerunsignedticks;1058410585/*AcknowledgethePS/2clockinterrupt.
*/10586if(machine.
ps_mca)outb(PORT_B,inb(PORT_B)|CLOCK_ACK_BIT);1058710588/*Getnumberofticksandupdaterealtime.
*/10589ticks=lost_ticks+1;10590lost_ticks=0;10591realtime+=ticks;1059210593/*Updateuserandsystemaccountingtimes.
Chargethecurrentprocessfor10594*usertime.
Ifthecurrentprocessisnotbillable,thatis,ifanon-user10595*processisrunning,chargethebillableprocessforsystemtimeaswell.
10596*Thustheunbillableprocess'usertimeisthebillableuser'ssystemtime.
10597*/10598proc_ptr->p_user_time+=ticks;10599if(priv(proc_ptr)->s_flags&PREEMPTIBLE){10600proc_ptr->p_ticks_left-=ticks;10601}10602if(!
(priv(proc_ptr)->s_flags&BILLABLE)){10603bill_ptr->p_sys_time+=ticks;10604bill_ptr->p_ticks_left-=ticks;10605}1060610607/*Checkifdo_clocktick()mustbecalled.
Doneforalarmsandscheduling.
10608*Someprocesses,suchasthekerneltasks,cannotbepreempted.
10609*/10610if((next_timeoutp_ticks_lefttmr_exp_time;10639}1064110642*reset_timer*1064310644PUBLICvoidreset_timer(tp)10645structtimer*tp;/*pointertotimerstructure*/10646{10647/*Thetimerpointedtoby'tp'isnolongerneeded.
Removeitfromboththe10648*activeandexpiredlists.
Alwaysupdatethenexttimeouttimebysetting10649*ittothefrontoftheactivelist.
10650*/10651tmrs_clrtimer(&clock_timers,tp,NULL);10652next_timeout=(clock_timers==NULL)10653TMR_NEVER:clock_timers->tmr_exp_time;10654}1065610657*read_clock*1065810659PUBLICunsignedlongread_clock()10660{10661/*Readthecounterofchannel0ofthe8253Atimer.
Thiscountercounts10662*downatarateofTIMER_FREQandrestartsatTIMER_COUNT-1whenit10663*reacheszero.
Ahardwareinterrupt(clocktick)occurswhenthecounter10664*getstozeroandrestartsitscycle.
10665*/10666unsignedcount;1066710668outb(TIMER_MODE,LATCH_COUNT);10669count=inb(TIMER0);10670count|=(inb(TIMER0)*/1070610707/*Thefollowingaresobasic,allthe*.
cfilesgetthemautomatically.
*/10708#include/*MUSTbefirst*/10709#include/*MUSTbesecond*/10710#include10711#include10712#include10713#include10714#include632File:drivers/drivers.
hMINIXSOURCECODE10715#include10716#include10717#include10718#include10719#include1072010721#include/*IRQvectorsandmiscellaneousports*/10722#include/*BIOSindexnumbers*/10723#include/*Well-knownports*/1072410725#include10726#include10727#include10728#include10729#include10730#include10731#include10732drivers/libdriver/driver.
h10800/*Typesandconstantssharedbetweenthegenericanddevicedependent10801*devicedrivercode.
10802*/1080310804#define_POSIX_SOURCE1/*tellheaderstoincludePOSIXstuff*/10805#define_MINIX1/*tellheaderstoincludeMINIXstuff*/10806#define_SYSTEM1/*getnegativeerrornumberin*/1080710808/*Thefollowingaresobasic,allthe*.
cfilesgetthemautomatically.
*/10809#include/*MUSTbefirst*/10810#include/*MUSTbesecond*/10811#include10812#include10813#include10814#include10815#include10816#include10817#include10818#include1081910820#include10821#include10822#include10823#include1082410825#include10826#include1082710828/*Infoaboutandentrypointsintothedevicedependentcode.
*/10829structdriver{10830_PROTOTYPE(char*(*dr_name),(void));10831_PROTOTYPE(int(*dr_open),(structdriver*dp,message*m_ptr));10832_PROTOTYPE(int(*dr_close),(structdriver*dp,message*m_ptr));10833_PROTOTYPE(int(*dr_ioctl),(structdriver*dp,message*m_ptr));10834_PROTOTYPE(structdevice*(*dr_prepare),(intdevice));MINIXSOURCECODEFile:drivers/libdriver/driver.
h63310835_PROTOTYPE(int(*dr_transfer),(intproc_nr,intopcode,off_tposition,10836iovec_t*iov,unsignednr_req));10837_PROTOTYPE(void(*dr_cleanup),(void));10838_PROTOTYPE(void(*dr_geometry),(structpartition*entry));10839_PROTOTYPE(void(*dr_signal),(structdriver*dp,message*m_ptr));10840_PROTOTYPE(void(*dr_alarm),(structdriver*dp,message*m_ptr));10841_PROTOTYPE(int(*dr_cancel),(structdriver*dp,message*m_ptr));10842_PROTOTYPE(int(*dr_select),(structdriver*dp,message*m_ptr));10843_PROTOTYPE(int(*dr_other),(structdriver*dp,message*m_ptr));10844_PROTOTYPE(int(*dr_hw_int),(structdriver*dp,message*m_ptr));10845};1084610847#if(CHIP==INTEL)1084810849/*NumberofbytesyoucanDMAbeforehittinga64Kboundary:*/10850#definedma_bytes_left(phys)\10851((unsigned)(sizeof(int)==20:0x10000)-(unsigned)((phys)&0xFFFF))1085210853#endif/*CHIP==INTEL*/1085410855/*Baseandsizeofapartitioninbytes.
*/10856structdevice{10857u64_tdv_base;10858u64_tdv_size;10859};1086010861#defineNIL_DEV((structdevice*)0)1086210863/*Functionsdefinedbydriver.
c:*/10864_PROTOTYPE(voiddriver_task,(structdriver*dr));10865_PROTOTYPE(char*no_name,(void));10866_PROTOTYPE(intdo_nop,(structdriver*dp,message*m_ptr));10867_PROTOTYPE(structdevice*nop_prepare,(intdevice));10868_PROTOTYPE(voidnop_cleanup,(void));10869_PROTOTYPE(voidnop_task,(void));10870_PROTOTYPE(voidnop_signal,(structdriver*dp,message*m_ptr));10871_PROTOTYPE(voidnop_alarm,(structdriver*dp,message*m_ptr));10872_PROTOTYPE(intnop_cancel,(structdriver*dp,message*m_ptr));10873_PROTOTYPE(intnop_select,(structdriver*dp,message*m_ptr));10874_PROTOTYPE(intdo_diocntl,(structdriver*dp,message*m_ptr));1087510876/*Parametersforthediskdrive.
*/10877#defineSECTOR_SIZE512/*physicalsectorsizeinbytes*/10878#defineSECTOR_SHIFT9/*fordivision*/10879#defineSECTOR_MASK511/*andremainder*/1088010881/*SizeoftheDMAbufferbufferinbytes.
*/10882#defineUSE_EXTRA_DMA_BUF0/*usuallynotneeded*/10883#defineDMA_BUF_SIZE(DMA_SECTORS*SECTOR_SIZE)1088410885#if(CHIP==INTEL)10886externu8_t*tmp_buf;/*theDMAbuffer*/10887#else10888externu8_ttmp_buf[];/*theDMAbuffer*/10889#endif10890externphys_bytestmp_phys;/*physaddressofDMAbuffer*/634File:drivers/libdriver/drvlib.
hMINIXSOURCECODEdrivers/libdriver/drvlib.
h10900/*IBMdevicedriverdefinitionsAuthor:KeesJ.
Bot10901*7Dec199510902*/1090310904#include1090510906_PROTOTYPE(voidpartition,(structdriver*dr,intdevice,intstyle,intatapi));1090710908/*BIOSparametertablelayout.
*/10909#definebp_cylinders(t)(*(u16_t*)(&(t)[0]))10910#definebp_heads(t)(*(u8_t*)(&(t)[2]))10911#definebp_reduced_wr(t)(*(u16_t*)(&(t)[3]))10912#definebp_precomp(t)(*(u16_t*)(&(t)[5]))10913#definebp_max_ecc(t)(*(u8_t*)(&(t)[7]))10914#definebp_ctlbyte(t)(*(u8_t*)(&(t)[8]))10915#definebp_landingzone(t)(*(u16_t*)(&(t)[12]))10916#definebp_sectors(t)(*(u8_t*)(&(t)[14]))1091710918/*Miscellaneous.
*/10919#defineDEV_PER_DRIVE(1+NR_PARTITIONS)10920#defineMINOR_t06410921#defineMINOR_r012010922#defineMINOR_d0p0s012810923#defineMINOR_fd0p0(2811039#include"driver.
h"1104011041#defineBUF_EXTRA01104211043/*Claimspaceforvariables.
*/11044PRIVATEu8_tbuffer[(unsigned)2*DMA_BUF_SIZE+BUF_EXTRA];11045u8_t*tmp_buf;/*theDMAbuffereventually*/11046phys_bytestmp_phys;/*physaddressofDMAbuffer*/1104711048FORWARD_PROTOTYPE(voidinit_buffer,(void));11049FORWARD_PROTOTYPE(intdo_rdwt,(structdriver*dr,message*mp));11050FORWARD_PROTOTYPE(intdo_vrdwt,(structdriver*dr,message*mp));1105111052intdevice_caller;110531105411055*driver_task*1105611057PUBLICvoiddriver_task(dp)11058structdriver*dp;/*Devicedependententrypoints.
*/11059{11060/*Mainprogramofanydevicedrivertask.
*/1106111062intr,proc_nr;11063messagemess;1106411065/*GetaDMAbuffer.
*/11066init_buffer();1106711068/*Hereisthemainloopofthedisktask.
Itwaitsforamessage,carries11069*itout,andsendsareply.
11070*/11071while(TRUE){1107211073/*Waitforarequesttoreadorwriteadiskblock.
*/11074if(receive(ANY,&mess)!
=OK)continue;1107511076device_caller=mess.
m_source;11077proc_nr=mess.
PROC_NR;1107811079/*Nowcarryoutthework.
*/636File:drivers/libdriver/driver.
cMINIXSOURCECODE11080switch(mess.
m_type){11081caseDEV_OPEN:r=(*dp->dr_open)(dp,&mess);break;11082caseDEV_CLOSE:r=(*dp->dr_close)(dp,&mess);break;11083caseDEV_IOCTL:r=(*dp->dr_ioctl)(dp,&mess);break;11084caseCANCEL:r=(*dp->dr_cancel)(dp,&mess);break;11085caseDEV_SELECT:r=(*dp->dr_select)(dp,&mess);break;1108611087caseDEV_READ:11088caseDEV_WRITE:r=do_rdwt(dp,&mess);break;11089caseDEV_GATHER:11090caseDEV_SCATTER:r=do_vrdwt(dp,&mess);break;1109111092caseHARD_INT:/*leftoverinterruptorexpiredtimer.
*/11093if(dp->dr_hw_int){11094(*dp->dr_hw_int)(dp,&mess);11095}11096continue;11097caseSYS_SIG:(*dp->dr_signal)(dp,&mess);11098continue;/*don'treply*/11099caseSYN_ALARM:(*dp->dr_alarm)(dp,&mess);11100continue;/*don'treply*/11101default:11102if(dp->dr_other)11103r=(*dp->dr_other)(dp,&mess);11104else11105r=EINVAL;11106break;11107}1110811109/*Cleanupleftoverstate.
*/11110(*dp->dr_cleanup)();1111111112/*Finally,prepareandsendthereplymessage.
*/11113if(r!
=EDONTREPLY){11114mess.
m_type=TASK_REPLY;11115mess.
REP_PROC_NR=proc_nr;11116/*Statusis#ofbytestransferredorerrorcode.
*/11117mess.
REP_STATUS=r;11118send(device_caller,&mess);11119}11120}11121}1112311124*init_buffer*1112511126PRIVATEvoidinit_buffer()11127{11128/*SelectabufferthatcansafelybeusedforDMAtransfers.
Itmayalso11129*beusedtoreadpartitiontablesandsuch.
Itsabsoluteaddressis11130*'tmp_phys',thenormaladdressis'tmp_buf'.
11131*/1113211133unsignedleft;1113411135tmp_buf=buffer;11136sys_umap(SELF,D,(vir_bytes)buffer,(phys_bytes)sizeof(buffer),&tmp_phys);1113711138if((left=dma_bytes_left(tmp_phys))COUNTPROC_NR,D,(vir_bytes)mp->ADDRESS,mp->COUNT,&phys_addr);11162if(phys_addr==0)return(EFAULT);1116311164/*PrepareforI/O.
*/11165if((*dp->dr_prepare)(mp->DEVICE)==NIL_DEV)return(ENXIO);1116611167/*Createaoneelementscatter/gathervectorforthebuffer.
*/11168opcode=mp->m_type==DEV_READDEV_GATHER:DEV_SCATTER;11169iovec1.
iov_addr=(vir_bytes)mp->ADDRESS;11170iovec1.
iov_size=mp->COUNT;1117111172/*Transferbytesfrom/tothedevice.
*/11173r=(*dp->dr_transfer)(mp->PROC_NR,opcode,mp->POSITION,&iovec1,1);1117411175/*Returnthenumberofbytestransferredoranerrorcode.
*/11176return(r==OK(mp->COUNT-iovec1.
iov_size):r);11177}1117911180*do_vrdwt*1118111182PRIVATEintdo_vrdwt(dp,mp)11183structdriver*dp;/*devicedependententrypoints*/11184message*mp;/*pointertoreadorwritemessage*/11185{11186/*Carryoutandevicereadorwriteto/fromavectorofuseraddresses.
11187*The"useraddresses"areassumedtobesafe,i.
e.
FStransferringto/from11188*itsownbuffers,sotheyarenotchecked.
11189*/11190staticiovec_tiovec[NR_IOREQS];11191iovec_t*iov;11192phys_bytesiovec_size;11193unsignednr_req;11194intr;1119511196nr_req=mp->COUNT;/*LengthofI/Ovector*/1119711198if(mp->m_sourceADDRESS;11201}else{11202/*Copythevectorfromthecallertokernelspace.
*/11203if(nr_req>NR_IOREQS)nr_req=NR_IOREQS;11204iovec_size=(phys_bytes)(nr_req*sizeof(iovec[0]));1120511206if(OK!
=sys_datacopy(mp->m_source,(vir_bytes)mp->ADDRESS,11207SELF,(vir_bytes)iovec,iovec_size))11208panic((*dp->dr_name)(),"badI/Ovectorby",mp->m_source);11209iov=iovec;11210}1121111212/*PrepareforI/O.
*/11213if((*dp->dr_prepare)(mp->DEVICE)==NIL_DEV)return(ENXIO);1121411215/*Transferbytesfrom/tothedevice.
*/11216r=(*dp->dr_transfer)(mp->PROC_NR,mp->m_type,mp->POSITION,iov,nr_req);1121711218/*CopytheI/Ovectorbacktothecaller.
*/11219if(mp->m_source>=0){11220sys_datacopy(SELF,(vir_bytes)iovec,11221mp->m_source,(vir_bytes)mp->ADDRESS,iovec_size);11222}11223return(r);11224}1122611227*no_name*1122811229PUBLICchar*no_name()11230{11231/*Usethisdefaultnameifthereisnospecificnameforthedevice.
Thiswas11232*originallydonebyfetchingthenamefromthetasktableforthisprocess:11233*"return(tasktab[proc_number(proc_ptr)+NR_TASKS].
name);",butcurrentlya11234*real"noname"isreturned.
Perhaps,somesysteminformationservicecanbe11235*queriedforanameatalatertime.
11236*/11237staticcharname[]="noname";11238returnname;11239}1124111242*do_nop*1124311244PUBLICintdo_nop(dp,mp)11245structdriver*dp;11246message*mp;11247{11248/*Nothingthere,ornothingtodo.
*/1124911250switch(mp->m_type){11251caseDEV_OPEN:return(ENODEV);11252caseDEV_CLOSE:return(OK);11253caseDEV_IOCTL:return(ENOTTY);11254default:return(EIO);11255}11256}MINIXSOURCECODEFile:drivers/libdriver/driver.
c6391125811259*nop_signal*1126011261PUBLICvoidnop_signal(dp,mp)11262structdriver*dp;11263message*mp;11264{11265/*Defaultactionforsignalistoignore.
*/11266}1126811269*nop_alarm*1127011271PUBLICvoidnop_alarm(dp,mp)11272structdriver*dp;11273message*mp;11274{11275/*Ignoretheleftoveralarm.
*/11276}1127811279*nop_prepare*1128011281PUBLICstructdevice*nop_prepare(device)11282{11283/*Nothingtopreparefor.
*/11284return(NIL_DEV);11285}1128711288*nop_cleanup*1128911290PUBLICvoidnop_cleanup()11291{11292/*Nothingtocleanup.
*/11293}1129511296*nop_cancel*1129711298PUBLICintnop_cancel(structdriver*dr,message*m)11299{11300/*Nothingtodoforcancel.
*/11301return(OK);11302}1130411305*nop_select*1130611307PUBLICintnop_select(structdriver*dr,message*m)11308{11309/*Nothingtodoforselect.
*/11310return(OK);11311}1131311314*do_diocntl*1131511316PUBLICintdo_diocntl(dp,mp)11317structdriver*dp;640File:drivers/libdriver/driver.
cMINIXSOURCECODE11318message*mp;/*pointertoioctlrequest*/11319{11320/*Carryoutapartitionsetting/gettingrequest.
*/11321structdevice*dv;11322structpartitionentry;11323ints;1132411325if(mp->REQUEST!
=DIOCSETP&&mp->REQUEST!
=DIOCGETP){11326if(dp->dr_other){11327returndp->dr_other(dp,mp);11328}elsereturn(ENOTTY);11329}1133011331/*Decodethemessageparameters.
*/11332if((dv=(*dp->dr_prepare)(mp->DEVICE))==NIL_DEV)return(ENXIO);1133311334if(mp->REQUEST==DIOCSETP){11335/*Copyjustthisonepartitiontableentry.
*/11336if(OK!
=(s=sys_datacopy(mp->PROC_NR,(vir_bytes)mp->ADDRESS,11337SELF,(vir_bytes)&entry,sizeof(entry))))11338returns;11339dv->dv_base=entry.
base;11340dv->dv_size=entry.
size;11341}else{11342/*Returnapartitiontableentryandthegeometryofthedrive.
*/11343entry.
base=dv->dv_base;11344entry.
size=dv->dv_size;11345(*dp->dr_geometry)(&entry);11346if(OK!
=(s=sys_datacopy(SELF,(vir_bytes)&entry,11347mp->PROC_NR,(vir_bytes)mp->ADDRESS,sizeof(entry))))11348returns;11349}11350return(OK);11351}drivers/libdriver/drvlib.
c11400/*IBMdevicedriverutilityfunctions.
Author:KeesJ.
Bot11401*7Dec199511402*Entrypoint:11403*partition:partitionadisktothepartitiontable(s)onit.
11404*/1140511406#include"driver.
h"11407#include"drvlib.
h"11408#include1140911410/*Extendedpartition*/11411#defineext_part(s)((s)==0x05||(s)==0x0F)1141211413FORWARD_PROTOTYPE(voidextpartition,(structdriver*dp,intextdev,11414unsignedlongextbase));11415FORWARD_PROTOTYPE(intget_part_table,(structdriver*dp,intdevice,11416unsignedlongoffset,structpart_entry*table));11417FORWARD_PROTOTYPE(voidsort,(structpart_entry*table));1141811419#ifndefCD_SECTOR_SIZEMINIXSOURCECODEFile:drivers/libdriver/drvlib.
c64111420#defineCD_SECTOR_SIZE204811421#endif114221142311424*partition*1142511426PUBLICvoidpartition(dp,device,style,atapi)11427structdriver*dp;/*devicedependententrypoints*/11428intdevice;/*devicetopartition*/11429intstyle;/*partitioningstyle:floppy,primary,sub.
*/11430intatapi;/*atapidevice*/11431{11432/*Thisroutineiscalledonfirstopentoinitializethepartitiontables11433*ofadevice.
Itmakessurethateachpartitionfallssafelywithinthe11434*device'slimits.
Dependingonthepartitionstyleweareeithermaking11435*floppypartitions,primarypartitionsorsubpartitions.
Onlyprimary11436*partitionsaresorted,becausetheyaresharedwithotheroperating11437*systemsthatexpectthis.
11438*/11439structpart_entrytable[NR_PARTITIONS],*pe;11440intdisk,par;11441structdevice*dv;11442unsignedlongbase,limit,part_limit;1144311444/*Getthegeometryofthedevicetopartition*/11445if((dv=(*dp->dr_prepare)(device))==NIL_DEV11446||cmp64u(dv->dv_size,0)==0)return;11447base=div64u(dv->dv_base,SECTOR_SIZE);11448limit=base+div64u(dv->dv_size,SECTOR_SIZE);1144911450/*Readthepartitiontableforthedevice.
*/11451if(!
get_part_table(dp,device,0L,table)){11452return;11453}1145411455/*Computethedevicenumberofthefirstpartition.
*/11456switch(style){11457caseP_FLOPPY:11458device+=MINOR_fd0p0;11459break;11460caseP_PRIMARY:11461sort(table);/*sortaprimarypartitiontable*/11462device+=1;11463break;11464caseP_SUB:11465disk=device/DEV_PER_DRIVE;11466par=device%DEV_PER_DRIVE-1;11467device=MINOR_d0p0s0+(disk*NR_PARTITIONS+par)*NR_PARTITIONS;11468}1146911470/*Findanarrayofdevices.
*/11471if((dv=(*dp->dr_prepare)(device))==NIL_DEV)return;1147211473/*Setthegeometryofthepartitionsfromthepartitiontable.
*/11474for(par=0;parlowsec+pe->size;11478if(part_limitlowsec)part_limit=limit;11479if(part_limit>limit)part_limit=limit;642File:drivers/libdriver/drvlib.
cMINIXSOURCECODE11480if(pe->lowseclowsec=base;11481if(part_limitlowsec)part_limit=pe->lowsec;1148211483dv->dv_base=mul64u(pe->lowsec,SECTOR_SIZE);11484dv->dv_size=mul64u(part_limit-pe->lowsec,SECTOR_SIZE);1148511486if(style==P_PRIMARY){11487/*EachMinixprimarypartitioncanbesubpartitioned.
*/11488if(pe->sysind==MINIX_PART)11489partition(dp,device+par,P_SUB,atapi);1149011491/*Anextendedpartitionhaslogicalpartitions.
*/11492if(ext_part(pe->sysind))11493extpartition(dp,device+par,pe->lowsec);11494}11495}11496}1149811499*extpartition*1150011501PRIVATEvoidextpartition(dp,extdev,extbase)11502structdriver*dp;/*devicedependententrypoints*/11503intextdev;/*extendedpartitiontoscan*/11504unsignedlongextbase;/*sectoroffsetofthebaseextendedpartition*/11505{11506/*Extendedpartitionscannotbeignoredalas,becausepeopleliketomove11507*filestoandfromDOSpartitions.
Avoidreadingthiscode,it'snofun.
11508*/11509structpart_entrytable[NR_PARTITIONS],*pe;11510intsubdev,disk,par;11511structdevice*dv;11512unsignedlongoffset,nextoffset;1151311514disk=extdev/DEV_PER_DRIVE;11515par=extdev%DEV_PER_DRIVE-1;11516subdev=MINOR_d0p0s0+(disk*NR_PARTITIONS+par)*NR_PARTITIONS;1151711518offset=0;11519do{11520if(!
get_part_table(dp,extdev,offset,table))return;11521sort(table);1152211523/*Thetableshouldcontainonelogicalpartitionandoptionally11524*anotherextendedpartition.
(It'salinkedlist.
)11525*/11526nextoffset=0;11527for(par=0;parsysind)){11530nextoffset=pe->lowsec;11531}else11532if(pe->sysind!
=NO_PART){11533if((dv=(*dp->dr_prepare)(subdev))==NIL_DEV)return;1153411535dv->dv_base=mul64u(extbase+offset+pe->lowsec,11536SECTOR_SIZE);11537dv->dv_size=mul64u(pe->size,SECTOR_SIZE);1153811539/*Outofdevices*/MINIXSOURCECODEFile:drivers/libdriver/drvlib.
c64311540if(++subdev%NR_PARTITIONS==0)return;11541}11542}11543}while((offset=nextoffset)!
=0);11544}1154611547*get_part_table*1154811549PRIVATEintget_part_table(dp,device,offset,table)11550structdriver*dp;11551intdevice;11552unsignedlongoffset;/*sectoroffsettothetable*/11553structpart_entry*table;/*fourentries*/11554{11555/*Readthepartitiontableforthedevice,returntrueifftherewereno11556*errors.
11557*/11558iovec_tiovec1;11559off_tposition;11560staticunsignedcharpartbuf[CD_SECTOR_SIZE];1156111562position=offsetdr_prepare)(device)!
=NIL_DEV){11566(void)(*dp->dr_transfer)(SELF,DEV_GATHER,position,&iovec1,1);11567}11568if(iovec1.
iov_size!
=0){11569return0;11570}11571if(partbuf[510]!
=0x55||partbuf[511]!
=0xAA){11572/*Invalidpartitiontable.
*/11573return0;11574}11575memcpy(table,(partbuf+PART_TABLE_OFF),NR_PARTITIONS*sizeof(table[0]));11576return1;11577}1157911580*sort*1158111582PRIVATEvoidsort(table)11583structpart_entry*table;11584{11585/*Sortapartitiontable.
*/11586structpart_entry*pe,tmp;11587intn=NR_PARTITIONS;1158811589do{11590for(pe=table;pepe[1].
lowsec11593&&pe[1].
sysind!
=NO_PART)){11594tmp=pe[0];pe[0]=pe[1];pe[1]=tmp;11595}11596}11597}while(--n>0);11598}644File:drivers/memory/memory.
cMINIXSOURCECODEdrivers/memory/memory.
c11600/*Thisfilecontainsthedevicedependentpartofthedriversforthe11601*followingspecialfiles:11602*/dev/ram-RAMdisk11603*/dev/mem-absolutememory11604*/dev/kmem-kernelvirtualmemory11605*/dev/null-nulldevice(datasink)11606*/dev/boot-bootdeviceloadedfrombootimage11607*/dev/zero-nullbytestreamgenerator11608*11609*Changes:11610*Apr29,2005addednullbytegenerator(JorritN.
Herder)11611*Apr09,2005addedsupportforbootdevice(JorritN.
Herder)11612*Jul26,2004movedRAMdrivertouser-space(JorritN.
Herder)11613*Apr20,1992devicedependent/independentsplit(KeesJ.
Bot)11614*/1161511616#include".
.
/drivers.
h"11617#include".
.
/libdriver/driver.
h"11618#include11619#include".
.
/.
.
/kernel/const.
h"11620#include".
.
/.
.
/kernel/config.
h"11621#include".
.
/.
.
/kernel/type.
h"1162211623#include"assert.
h"1162411625#defineNR_DEVS6/*numberofminordevices*/1162611627PRIVATEstructdevicem_geom[NR_DEVS];/*baseandsizeofeachdevice*/11628PRIVATEintm_seg[NR_DEVS];/*segmentindexofeachdevice*/11629PRIVATEintm_device;/*currentdevice*/11630PRIVATEstructkinfokinfo;/*kernelinformation*/11631PRIVATEstructmachinemachine;/*machineinformation*/1163211633externinterrno;/*errornumberforPMcalls*/1163411635FORWARD_PROTOTYPE(char*m_name,(void));11636FORWARD_PROTOTYPE(structdevice*m_prepare,(intdevice));11637FORWARD_PROTOTYPE(intm_transfer,(intproc_nr,intopcode,off_tposition,11638iovec_t*iov,unsignednr_req));11639FORWARD_PROTOTYPE(intm_do_open,(structdriver*dp,message*m_ptr));11640FORWARD_PROTOTYPE(voidm_init,(void));11641FORWARD_PROTOTYPE(intm_ioctl,(structdriver*dp,message*m_ptr));11642FORWARD_PROTOTYPE(voidm_geometry,(structpartition*entry));1164311644/*Entrypointstothisdriver.
*/11645PRIVATEstructdriverm_dtab={11646m_name,/*currentdevice'sname*/11647m_do_open,/*openormount*/11648do_nop,/*nothingonaclose*/11649m_ioctl,/*specifyramdiskgeometry*/11650m_prepare,/*prepareforI/Oonagivenminordevice*/11651m_transfer,/*dotheI/O*/11652nop_cleanup,/*noneedtocleanup*/11653m_geometry,/*memorydevice"geometry"*/11654nop_signal,/*systemsignals*/MINIXSOURCECODEFile:drivers/memory/memory.
c64511655nop_alarm,11656nop_cancel,11657nop_select,11658NULL,11659NULL11660};1166111662/*Bufferforthe/dev/zeronullbytefeed.
*/11663#defineZERO_BUF_SIZE102411664PRIVATEchardev_zero[ZERO_BUF_SIZE];1166511666#defineclick_to_round_k(n)\11667((unsigned)((((unsignedlong)(n)=NR_DEVS)return(NIL_DEV);11698m_device=device;1169911700return(&m_geom[device]);11701}1170311704*m_transfer*1170511706PRIVATEintm_transfer(proc_nr,opcode,position,iov,nr_req)11707intproc_nr;/*processdoingtherequest*/11708intopcode;/*DEV_GATHERorDEV_SCATTER*/11709off_tposition;/*offsetondevicetoreadorwrite*/11710iovec_t*iov;/*pointertoreadorwriterequestvector*/11711unsignednr_req;/*lengthofrequestvector*/11712{11713/*Readorwriteonethedriver'sminordevices.
*/11714phys_bytesmem_phys;646File:drivers/memory/memory.
cMINIXSOURCECODE11715intseg;11716unsignedcount,left,chunk;11717vir_bytesuser_vir;11718structdevice*dv;11719unsignedlongdv_size;11720ints;1172111722/*Getminordevicenumberandcheckfor/dev/null.
*/11723dv=&m_geom[m_device];11724dv_size=cv64ul(dv->dv_size);1172511726while(nr_req>0){1172711728/*Howmuchtotransferandwhereto/from.
*/11729count=iov->iov_size;11730user_vir=iov->iov_addr;1173111732switch(m_device){1173311734/*Nocopying;ignorerequest.
*/11735caseNULL_DEV:11736if(opcode==DEV_GATHER)return(OK);/*alwaysatEOF*/11737break;1173811739/*Virtualcopying.
ForRAMdisk,kernelmemoryandbootdevice.
*/11740caseRAM_DEV:11741caseKMEM_DEV:11742caseBOOT_DEV:11743if(position>=dv_size)return(OK);/*checkforEOF*/11744if(position+count>dv_size)count=dv_size-position;11745seg=m_seg[m_device];1174611747if(opcode==DEV_GATHER){/*copyactualdata*/11748sys_vircopy(SELF,seg,position,proc_nr,D,user_vir,count);11749}else{11750sys_vircopy(proc_nr,D,user_vir,SELF,seg,position,count);11751}11752break;1175311754/*Physicalcopying.
Onlyusedtoaccessentirememory.
*/11755caseMEM_DEV:11756if(position>=dv_size)return(OK);/*checkforEOF*/11757if(position+count>dv_size)count=dv_size-position;11758mem_phys=cv64ul(dv->dv_base)+position;1175911760if(opcode==DEV_GATHER){/*copydata*/11761sys_physcopy(NONE,PHYS_SEG,mem_phys,11762proc_nr,D,user_vir,count);11763}else{11764sys_physcopy(proc_nr,D,user_vir,11765NONE,PHYS_SEG,mem_phys,count);11766}11767break;1176811769/*Nullbytestreamgenerator.
*/11770caseZERO_DEV:11771if(opcode==DEV_GATHER){11772left=count;11773while(left>0){11774chunk=(left>ZERO_BUF_SIZE)ZERO_BUF_SIZE:left;MINIXSOURCECODEFile:drivers/memory/memory.
c64711775if(OK!
=(s=sys_vircopy(SELF,D,(vir_bytes)dev_zero,11776proc_nr,D,user_vir,chunk)))11777report("MEM","sys_vircopyfailed",s);11778left-=chunk;11779user_vir+=chunk;11780}11781}11782break;1178311784/*Unknown(illegal)minordevice.
*/11785default:11786return(EINVAL);11787}1178811789/*Bookthenumberofbytestransferred.
*/11790position+=count;11791iov->iov_addr+=count;11792if((iov->iov_size-=count)==0){iov++;nr_req--;}1179311794}11795return(OK);11796}1179811799*m_do_open*1180011801PRIVATEintm_do_open(dp,m_ptr)11802structdriver*dp;11803message*m_ptr;11804{11805/*Checkdevicenumberonopen.
(ThisusedtogiveI/Oprivilegestoa11806*processopening/dev/memor/dev/kmem.
Thismaybeneededincaseof11807*memorymappedI/O.
WithsystemcallstodoI/Othisisnolongerneeded.
)11808*/11809if(m_prepare(m_ptr->DEVICE)==NIL_DEV)return(ENXIO);1181011811return(OK);11812}1181411815*m_init*1181611817PRIVATEvoidm_init()11818{11819/*Initializethistask.
Allminordevicesareinitializedonebyone.
*/11820inti,s;1182111822if(OK!
=(s=sys_getkinfo(&kinfo))){11823panic("MEM","Couldn'tgetkernelinformation.
",s);11824}1182511826/*Installremotesegmentfor/dev/kmemmemory.
*/11827m_geom[KMEM_DEV].
dv_base=cvul64(kinfo.
kmem_base);11828m_geom[KMEM_DEV].
dv_size=cvul64(kinfo.
kmem_size);11829if(OK!
=(s=sys_segctl(&m_seg[KMEM_DEV],(u16_t*)&s,(vir_bytes*)&s,11830kinfo.
kmem_base,kinfo.
kmem_size))){11831panic("MEM","Couldn'tinstallremotesegment.
",s);11832}1183311834/*Installremotesegmentfor/dev/bootmemory,ifenabled.
*/648File:drivers/memory/memory.
cMINIXSOURCECODE11835m_geom[BOOT_DEV].
dv_base=cvul64(kinfo.
bootdev_base);11836m_geom[BOOT_DEV].
dv_size=cvul64(kinfo.
bootdev_size);11837if(kinfo.
bootdev_base>0){11838if(OK!
=(s=sys_segctl(&m_seg[BOOT_DEV],(u16_t*)&s,(vir_bytes*)&s,11839kinfo.
bootdev_base,kinfo.
bootdev_size))){11840panic("MEM","Couldn'tinstallremotesegment.
",s);11841}11842}1184311844/*Initialize/dev/zero.
Simplywritezerosintothebuffer.
*/11845for(i=0;iDEVICE))==NIL_DEV)return(ENXIO);1187211873switch(m_ptr->REQUEST){11874caseMIOCRAMSIZE:{11875/*FSwantstocreateanewRAMdiskwiththegivensize.
*/11876phys_bytesramdev_size;11877phys_bytesramdev_base;11878ints;1187911880if(m_ptr->PROC_NR!
=FS_PROC_NR){11881report("MEM","warning,MIOCRAMSIZEcalledby",m_ptr->PROC_NR);11882return(EPERM);11883}1188411885/*TrytoallocateapieceofmemoryfortheRAMdisk.
*/11886ramdev_size=m_ptr->POSITION;11887if(allocmem(ramdev_size,&ramdev_base)dv_base=cvul64(ramdev_base);11892dv->dv_size=cvul64(ramdev_size);1189311894if(OK!
=(s=sys_segctl(&m_seg[RAM_DEV],(u16_t*)&s,(vir_bytes*)&s,MINIXSOURCECODEFile:drivers/memory/memory.
c64911895ramdev_base,ramdev_size))){11896panic("MEM","Couldn'tinstallremotesegment.
",s);11897}11898break;11899}1190011901default:11902return(do_diocntl(&m_dtab,m_ptr));11903}11904return(OK);11905}1190711908*m_geometry*1190911910PRIVATEvoidm_geometry(entry)11911structpartition*entry;11912{11913/*Memorydevicesdon'thaveageometry,buttheoutsideworldinsists.
*/11914entry->cylinders=div64u(m_geom[m_device].
dv_size,SECTOR_SIZE)/(64*32);11915entry->heads=64;11916entry->sectors=32;11917}drivers/at_wini/at_wini.
h12000#include".
.
/drivers.
h"12001#include".
.
/libdriver/driver.
h"12002#include".
.
/libdriver/drvlib.
h"1200312004_PROTOTYPE(intmain,(void));1200512006#defineVERBOSE0/*displayidentifymessagesduringboot*/12007#defineENABLE_ATAPI0/*addATAPIcd-romsupporttodriver*/drivers/at_wini/at_wini.
c12100/*ThisfilecontainsthedevicedependentpartofadriverfortheIBM-AT12101*winchestercontroller.
WrittenbyAdriKoppes.
12102*12103*Thefilecontainsoneentrypoint:12104*12105*at_winchester_task:mainentrywhensystemisbroughtup12106*12107*Changes:12108*Aug19,2005atapcisupport,supportsSATA(BenGras)12109*Nov18,2004movedATdiskdrivertouser-space(JorritN.
Herder)12110*Aug20,2004watchdogsreplacedbysyncalarms(JorritN.
Herder)12111*Mar23,2000addedATAPICDROMsupport(MichaelTemari)12112*May14,2000d-d/irewrite(KeesJ.
Bot)12113*Apr13,1992devicedependent/independentsplit(KeesJ.
Bot)12114*/650File:drivers/at_wini/at_wini.
cMINIXSOURCECODE1211512116#include"at_wini.
h"12117#include".
.
/libpci/pci.
h"1211812119#include12120#include12121#include1212212123#defineATAPI_DEBUG0/*TodebugATAPIcode.
*/1212412125/*I/OPortsusedbywinchesterdiskcontrollers.
*/1212612127/*Readandwriteregisters*/12128#defineREG_CMD_BASE00x1F0/*commandbaseregisterofcontroller0*/12129#defineREG_CMD_BASE10x170/*commandbaseregisterofcontroller1*/12130#defineREG_CTL_BASE00x3F6/*controlbaseregisterofcontroller0*/12131#defineREG_CTL_BASE10x376/*controlbaseregisterofcontroller1*/1213212133#defineREG_DATA0/*dataregister(offsetfromthebasereg.
)*/12134#defineREG_PRECOMP1/*startofwriteprecompensation*/12135#defineREG_COUNT2/*sectorstotransfer*/12136#defineREG_SECTOR3/*sectornumber*/12137#defineREG_CYL_LO4/*lowbyteofcylindernumber*/12138#defineREG_CYL_HI5/*highbyteofcylindernumber*/12139#defineREG_LDH6/*lba,driveandhead*/12140#defineLDH_DEFAULT0xA0/*ECCenable,512bytespersector*/12141#defineLDH_LBA0x40/*UseLBAaddressing*/12142#defineldh_init(drive)(LDH_DEFAULT|((drive)CC0x40/*badeccbytes*/12158#defineERROR_ID0x10/*idnotfound*/12159#defineERROR_AC0x04/*abortedcommand*/12160#defineERROR_TK0x02/*trackzeroerror*/12161#defineERROR_DM0x01/*nodataaddressmark*/1216212163/*Writeonlyregisters*/12164#defineREG_COMMAND7/*command*/12165#defineCMD_IDLE0x00/*forw_command:driveidle*/12166#defineCMD_RECALIBRATE0x10/*recalibratedrive*/12167#defineCMD_READ0x20/*readdata*/12168#defineCMD_READ_EXT0x24/*readdata(LBA48addressed)*/12169#defineCMD_WRITE0x30/*writedata*/12170#defineCMD_WRITE_EXT0x34/*writedata(LBA48addressed)*/12171#defineCMD_READVERIFY0x40/*readverify*/12172#defineCMD_FORMAT0x50/*formattrack*/12173#defineCMD_SEEK0x70/*seekcylinder*/12174#defineCMD_DIAG0x90/*executedevicediagnostics*/MINIXSOURCECODEFile:drivers/at_wini/at_wini.
c65112175#defineCMD_SPECIFY0x91/*specifyparameters*/12176#defineATA_IDENTIFY0xEC/*identifydrive*/12177/*#defineREG_CTL0x206*//*controlregister*/12178#defineREG_CTL0/*controlregister*/12179#defineCTL_NORETRY0x80/*disableaccessretry*/12180#defineCTL_NOECC0x40/*disableeccretry*/12181#defineCTL_EIGHTHEADS0x08/*morethaneightheads*/12182#defineCTL_RESET0x04/*resetcontroller*/12183#defineCTL_INTDISABLE0x02/*disableinterrupts*/1218412185#defineREG_STATUS7/*status*/12186#defineSTATUS_BSY0x80/*controllerbusy*/12187#defineSTATUS_DRDY0x40/*driveready*/12188#defineSTATUS_DMADF0x20/*dmaready/drivefault*/12189#defineSTATUS_SRVCDSC0x10/*serviceordsc*/12190#defineSTATUS_DRQ0x08/*datatransferrequest*/12191#defineSTATUS_CORR0x04/*correctableerroroccurred*/12192#defineSTATUS_CHECK0x01/*checkerror*/1219312194/*Interruptrequestlines.
*/12195#defineNO_IRQ0/*noIRQsetyet*/1219612197#defineATAPI_PACKETSIZE1212198#defineSENSE_PACKETSIZE181219912200/*Commoncommandblock*/12201structcommand{12202u8_tprecomp;/*REG_PRECOMP,etc.
*/12203u8_tcount;12204u8_tsector;12205u8_tcyl_lo;12206u8_tcyl_hi;12207u8_tldh;12208u8_tcommand;12209};1221012211/*Errorcodes*/12212#defineERR(-1)/*generalerror*/12213#defineERR_BAD_SECTOR(-2)/*blockmarkedbaddetected*/1221412215/*Somecontrollersdon'tinterrupt,theclockwillwakeusup.
*/12216#defineWAKEUP(32*HZ)/*drivemaybeoutfor31secondsmax*/1221712218/*Miscellaneous.
*/12219#defineMAX_DRIVES812220#defineCOMPAT_DRIVES412221#defineMAX_SECS256/*controllercantransferthismanysectors*/12222#defineMAX_ERRORS4/*howoftentotryrd/wtbeforequitting*/12223#defineNR_MINORS(MAX_DRIVES*DEV_PER_DRIVE)12224#defineSUB_PER_DRIVE(NR_PARTITIONS*NR_PARTITIONS)12225#defineNR_SUBDEVS(MAX_DRIVES*SUB_PER_DRIVE)12226#defineDELAY_USECS1000/*controllertimeoutinmicroseconds*/12227#defineDELAY_TICKS1/*controllertimeoutinticks*/12228#defineDEF_TIMEOUT_TICKS300/*controllertimeoutinticks*/12229#defineRECOVERY_USECS500000/*controllerrecoverytimeinmicroseconds*/12230#defineRECOVERY_TICKS30/*controllerrecoverytimeinticks*/12231#defineINITIALIZED0x01/*driveisinitialized*/12232#defineDEAF0x02/*controllermustbereset*/12233#defineSMART0x04/*drivesupportsATAcommands*/12234#defineATAPI0/*don'tbotherwithATAPI;optimiseout*/652File:drivers/at_wini/at_wini.
cMINIXSOURCECODE12235#defineIDENTIFIED0x10/*w_identifydonesuccessfully*/12236#defineIGNORING0x20/*w_identifyfailedonce*/1223712238/*Timeoutsandmaxretries.
*/12239inttimeout_ticks=DEF_TIMEOUT_TICKS,max_errors=MAX_ERRORS;12240intwakeup_ticks=WAKEUP;12241longw_standard_timeouts=0,w_pci_debug=0,w_instance=0,12242w_lba48=0,atapi_debug=0;1224312244intw_testing=0,w_silent=0;1224512246intw_next_drive=0;1224712248/*Variables.
*/1224912250/*winiisindexedbycontrollerfirst,thendrive(0-3).
12251*controller0isalwaysthe'compatability'idecontroller,at12252*thefixedlocations,whetherpresentornot.
12253*/12254PRIVATEstructwini{/*maindrivestruct,oneentryperdrive*/12255unsignedstate;/*drivestate:deaf,initialized,dead*/12256unsignedw_status;/*devicestatusregister*/12257unsignedbase_cmd;/*commandbaseregister*/12258unsignedbase_ctl;/*controlbaseregister*/12259unsignedirq;/*interruptrequestline*/12260unsignedirq_mask;/*12)nr_drives=2;1237112372for(drive=0,wn=wini;drivelcylinders=bp_cylinders(params);12389wn->lheads=bp_heads(params);12390wn->lsectors=bp_sectors(params);12391wn->precomp=bp_precomp(params)>>2;12392}1239312394/*Fillinnon-BIOSparameters.
*/12395init_drive(wn,12396drivestate=0;12422w->w_status=0;12423w->base_cmd=base_cmd;12424w->base_ctl=base_ctl;12425w->irq=irq;12426w->irq_mask=1irq_need_ack=ack;12428w->irq_hook_id=hook;12429w->ldhpref=ldh_init(drive);12430w->max_count=MAX_SECSlba48=0;12432}1243412435*init_params_pci*1243612437PRIVATEvoidinit_params_pci(intskip)12438{12439intr,devind,drive;12440u16_tvid,did;12441pci_init();12442for(drive=w_next_drive;drive0){12465if(w_pci_debug)printf("atapciskippingcontroller(remain%d)\n",skip);12466skip--;12467continue;12468}12469if((s=sys_irqsetpolicy(irq,0,&irq_hook))!
=OK){12470printf("atapci:couldn'tsetIRQpolicy%d\n",irq);12471continue;12472}12473if((s=sys_irqenable(&irq_hook))!
=OK){12474printf("atapci:couldn'tenableIRQline%d\n",irq);656File:drivers/at_wini/at_wini.
cMINIXSOURCECODE12475continue;12476}12477}else{12478/*Ifnot.
.
thisisnottheata-pcicontrollerwe're12479*lookingfor.
12480*/12481if(w_pci_debug)printf("atapciskippingcompatabilitycontroller\n");12482continue;12483}1248412485/*Primarychannelnotincompatabilitymode*/12486if(interface&ATA_IF_NOTCOMPAT1){12487u32_tbase_cmd,base_ctl;12488base_cmd=pci_attr_r32(devind,PCI_BAR)&0xffffffe0;12489base_ctl=pci_attr_r32(devind,PCI_BAR_2)&0xffffffe0;12490if(base_cmd!
=REG_CMD_BASE0&&base_cmd!
=REG_CMD_BASE1){12491init_drive(&wini[w_next_drive],12492base_cmd,base_ctl,irq,1,irq_hook,0);12493init_drive(&wini[w_next_drive+1],12494base_cmd,base_ctl,irq,1,irq_hook,1);12495if(w_pci_debug)12496printf("atapci%d:0x%x0x%xirq%d\n",devind,base_cmd,base_ctl,irq);12497}elseprintf("atapci:ignoreddrivesonprimarychannel,base%x\n",base_cmd);12498}1249912500/*Secondarychannelnotincompatabilitymode*/12501if(interface&ATA_IF_NOTCOMPAT2){12502u32_tbase_cmd,base_ctl;12503base_cmd=pci_attr_r32(devind,PCI_BAR_3)&0xffffffe0;12504base_ctl=pci_attr_r32(devind,PCI_BAR_4)&0xffffffe0;12505if(base_cmd!
=REG_CMD_BASE0&&base_cmd!
=REG_CMD_BASE1){12506init_drive(&wini[w_next_drive+2],12507base_cmd,base_ctl,irq,1,irq_hook,2);12508init_drive(&wini[w_next_drive+3],12509base_cmd,base_ctl,irq,1,irq_hook,3);12510if(w_pci_debug)12511printf("atapci%d:0x%x0x%xirq%d\n",devind,base_cmd,base_ctl,irq);12512}elseprintf("atapci:ignoreddrivesonsecondarychannel,base%x\n",base_cmd);12513}12514w_next_drive+=4;12515}12516}1251812519*w_do_open*1252012521PRIVATEintw_do_open(dp,m_ptr)12522structdriver*dp;12523message*m_ptr;12524{12525/*Deviceopen:Initializethecontrollerandreadthepartitiontable.
*/1252612527structwini*wn;1252812529if(w_prepare(m_ptr->DEVICE)==NIL_DEV)return(ENXIO);1253012531wn=w_wn;1253212533/*Ifwe'veprobeditbeforeanditfailed,don'tprobeitagain.
*/12534if(wn->state&IGNORING)returnENXIO;MINIXSOURCECODEFile:drivers/at_wini/at_wini.
c6571253512536/*Ifwehaven'tidentifiedityet,orit'sgonedeaf,12537*(re-)identifyit.
12538*/12539if(!
(wn->state&IDENTIFIED)||(wn->state&DEAF)){12540/*Trytoidentifythedevice.
*/12541if(w_identify()!
=OK){12542if(wn->state&DEAF)w_reset();12543wn->state=IGNORING;12544return(ENXIO);12545}12546/*Doatesttransactionunlessit'saCDdrive(then12547*wecanbelievethecontroller,andatestmayfail12548*duetonoCDbeinginthedrive).
Ifitfails,ignore12549*thedeviceforever.
12550*/12551if(!
(wn->state&ATAPI)&&w_io_test()!
=OK){12552wn->state|=IGNORING;12553return(ENXIO);12554}12555}1255612557/*Ifit'snotanATAPIdevice,thendon'topenwithRO_BIT.
*/12558if(!
(wn->state&ATAPI)&&(m_ptr->COUNT&RO_BIT))returnEACCES;1255912560/*Partitionthedriveifit'sbeingopenedforthefirsttime,12561*orbeingopenedafterbeingclosed.
12562*/12563if(wn->open_ct==0){1256412565/*Partitionthedisk.
*/12566memset(wn->part,sizeof(wn->part),0);12567memset(wn->subpart,sizeof(wn->subpart),0);12568partition(&w_dtab,w_drive*DEV_PER_DRIVE,P_PRIMARY,wn->state&ATAPI);12569}12570wn->open_ct++;12571return(OK);12572}1257412575*w_prepare*1257612577PRIVATEstructdevice*w_prepare(intdevice)12578{12579/*PrepareforI/Oonadevice.
*/12580structwini*prev_wn;12581prev_wn=w_wn;12582w_device=device;1258312584if(devicepart[device%DEV_PER_DRIVE];12588}else12589if((unsigned)(device-=MINOR_d0p0s0)subpart[device%SUB_PER_DRIVE];12593}else{12594w_device=-1;658File:drivers/at_wini/at_wini.
cMINIXSOURCECODE12595return(NIL_DEV);12596}12597return(w_dv);12598}1260012601*w_identify*1260212603PRIVATEintw_identify()12604{12605/*Findoutifadeviceexists,ifitisanoldATdisk,oranewerATA12606*drive,aremovablemediadevice,etc.
12607*/1260812609structwini*wn=w_wn;12610structcommandcmd;12611inti,s;12612unsignedlongsize;12613#defineid_byte(n)(&tmp_buf[2*(n)])12614#defineid_word(n)(((u16_t)id_byte(n)[0]ldhpref;12623cmd.
command=ATA_IDENTIFY;12624if(com_simple(&cmd)==OK){12625/*ThisisanATAdevice.
*/12626wn->state|=SMART;1262712628/*Deviceinformation.
*/12629if((s=sys_insw(wn->base_cmd+REG_DATA,SELF,tmp_buf,SECTOR_SIZE))!
=OK)12630panic(w_name(),"Calltosys_insw()failed",s);1263112632/*Whyarethestringsbyteswapped*/12633for(i=0;ipcylinders=id_word(1);12637wn->pheads=id_word(3);12638wn->psectors=id_word(6);12639size=(u32_t)wn->pcylinders*wn->pheads*wn->psectors;1264012641if((id_byte(49)[1]&0x02)&&size>512L*1024*2){12642/*DriveisLBAcapableandisbigenoughtotrustitto12643*notmakeamessofit.
12644*/12645wn->ldhpref|=LDH_LBA;12646size=id_longword(60);1264712648if(w_lba48&&((id_word(83))&(1Llba48=1;12663}12664}1266512666if(wn->lcylinders==0){12667/*NoBIOSparametersThenmakesomeup.
*/12668wn->lcylinders=wn->pcylinders;12669wn->lheads=wn->pheads;12670wn->lsectors=wn->psectors;12671while(wn->lcylinders>1024){12672wn->lheads*=2;12673wn->lcylinders/=2;12674}12675}12676}else{12677/*NotanATAdevice;notranslations,nospecialfeatures.
Don't12678*touchitunlesstheBIOSknowsaboutit.
12679*/12680if(wn->lcylinders==0){return(ERR);}/*noBIOSparameters*/12681wn->pcylinders=wn->lcylinders;12682wn->pheads=wn->lheads;12683wn->psectors=wn->lsectors;12684size=(u32_t)wn->pcylinders*wn->pheads*wn->psectors;12685}1268612687/*Sizeofthewholedrive*/12688wn->part[0].
dv_size=mul64u(size,SECTOR_SIZE);1268912690/*Reset/calibrate(wherenecessary)*/12691if(w_specify()!
=OK&&w_specify()!
=OK){12692return(ERR);12693}1269412695if(wn->irq==NO_IRQ){12696/*EverythinglooksOK;registerIRQsowecanstoppolling.
*/12697wn->irq=w_driveirq_hook_id=wn->irq;/*idtobereturnedifinterruptoccurs*/12699if((s=sys_irqsetpolicy(wn->irq,IRQ_REENABLE,&wn->irq_hook_id))!
=OK)12700panic(w_name(),"couldn'tsetIRQpolicy",s);12701if((s=sys_irqenable(&wn->irq_hook_id))!
=OK)12702panic(w_name(),"couldn'tenableIRQline",s);12703}12704wn->state|=IDENTIFIED;12705return(OK);12706}1270812709*w_name*1271012711PRIVATEchar*w_name()12712{12713/*Returnanameforthecurrentdevice.
*/12714staticcharname[]="AT-D0";660File:drivers/at_wini/at_wini.
cMINIXSOURCECODE1271512716name[4]='0'+w_drive;12717returnname;12718}1272012721*w_io_test*1272212723PRIVATEintw_io_test(void)12724{12725intr,save_dev;12726intsave_timeout,save_errors,save_wakeup;12727iovec_tiov;12728staticcharbuf[SECTOR_SIZE];12729iov.
iov_addr=(vir_bytes)buf;12730iov.
iov_size=sizeof(buf);12731save_dev=w_device;1273212733/*Reducetimeoutvaluesforthistesttransaction.
*/12734save_timeout=timeout_ticks;12735save_errors=max_errors;12736save_wakeup=wakeup_ticks;1273712738if(!
w_standard_timeouts){12739timeout_ticks=HZ*4;12740wakeup_ticks=HZ*6;12741max_errors=3;12742}1274312744w_testing=1;1274512746/*TryI/Oontheactualdrive(notany(sub)partition).
*/12747if(w_prepare(w_drive*DEV_PER_DRIVE)==NIL_DEV)12748panic(w_name(),"Couldn'tswitchdevices",NO_NUM);1274912750r=w_transfer(SELF,DEV_GATHER,0,&iov,1);1275112752/*Switchback.
*/12753if(w_prepare(save_dev)==NIL_DEV)12754panic(w_name(),"Couldn'tswitchbackdevices",NO_NUM);1275512756/*Restoreparameters.
*/12757timeout_ticks=save_timeout;12758max_errors=save_errors;12759wakeup_ticks=save_wakeup;12760w_testing=0;1276112762/*Testifeverythingworked.
*/12763if(r!
=OK||iov.
iov_size!
=0){12764returnERR;12765}1276612767/*Everythingworked.
*/1276812769returnOK;12770}MINIXSOURCECODEFile:drivers/at_wini/at_wini.
c6611277212773*w_specify*1277412775PRIVATEintw_specify()12776{12777/*Routinetoinitializethedriveafterbootorwhenaresetisneeded.
*/1277812779structwini*wn=w_wn;12780structcommandcmd;1278112782if((wn->state&DEAF)&&w_reset()!
=OK){12783return(ERR);12784}1278512786if(!
(wn->state&ATAPI)){12787/*Specifyparameters:precompensation,numberofheadsandsectors.
*/12788cmd.
precomp=wn->precomp;12789cmd.
count=wn->psectors;12790cmd.
ldh=w_wn->ldhpref|(wn->pheads-1);12791cmd.
command=CMD_SPECIFY;/*Specifysomeparameters*/1279212793/*Outputcommandblockandseeifcontrolleracceptstheparameters.
*/12794if(com_simple(&cmd)!
=OK)return(ERR);1279512796if(!
(wn->state&SMART)){12797/*Calibrateanolddisk.
*/12798cmd.
sector=0;12799cmd.
cyl_lo=0;12800cmd.
cyl_hi=0;12801cmd.
ldh=w_wn->ldhpref;12802cmd.
command=CMD_RECALIBRATE;1280312804if(com_simple(&cmd)!
=OK)return(ERR);12805}12806}12807wn->state|=INITIALIZED;12808return(OK);12809}1281112812*do_transfer*1281312814PRIVATEintdo_transfer(structwini*wn,unsignedintprecomp,unsignedintcount,12815unsignedintsector,unsignedintopcode)12816{12817structcommandcmd;12818unsignedsecspcyl=wn->pheads*wn->psectors;1281912820cmd.
precomp=precomp;12821cmd.
count=count;12822cmd.
command=opcode==DEV_SCATTERCMD_WRITE:CMD_READ;12823/*12824if(w_lba48&&wn->lba48){12825}else*/12826if(wn->ldhpref&LDH_LBA){12827cmd.
sector=(sector>>0)&0xFF;12828cmd.
cyl_lo=(sector>>8)&0xFF;12829cmd.
cyl_hi=(sector>>16)&0xFF;12830cmd.
ldh=wn->ldhpref|((sector>>24)&0xF);12831}else{662File:drivers/at_wini/at_wini.
cMINIXSOURCECODE12832intcylinder,head,sec;12833cylinder=sector/secspcyl;12834head=(sector%secspcyl)/wn->psectors;12835sec=sector%wn->psectors;12836cmd.
sector=sec+1;12837cmd.
cyl_lo=cylinder&BYTE;12838cmd.
cyl_hi=(cylinder>>8)&BYTE;12839cmd.
ldh=wn->ldhpref|head;12840}1284112842returncom_out(&cmd);12843}1284512846*w_transfer*1284712848PRIVATEintw_transfer(proc_nr,opcode,position,iov,nr_req)12849intproc_nr;/*processdoingtherequest*/12850intopcode;/*DEV_GATHERorDEV_SCATTER*/12851off_tposition;/*offsetondevicetoreadorwrite*/12852iovec_t*iov;/*pointertoreadorwriterequestvector*/12853unsignednr_req;/*lengthofrequestvector*/12854{12855structwini*wn=w_wn;12856iovec_t*iop,*iov_end=iov+nr_req;12857intr,s,errors;12858unsignedlongblock;12859unsignedlongdv_size=cv64ul(w_dv->dv_size);12860unsignedcylinder,head,sector,nbytes;1286112862/*Checkdiskaddress.
*/12863if((position&SECTOR_MASK)!
=0)return(EINVAL);1286412865errors=0;1286612867while(nr_req>0){12868/*Howmanybytestotransfer*/12869nbytes=0;12870for(iop=iov;iopiov_size;12871if((nbytes&SECTOR_MASK)!
=0)return(EINVAL);1287212873/*WhichblockondiskandhowclosetoEOF*/12874if(position>=dv_size)return(OK);/*AtEOF*/12875if(position+nbytes>dv_size)nbytes=dv_size-position;12876block=div64u(add64ul(w_dv->dv_base,position),SECTOR_SIZE);1287712878if(nbytes>=wn->max_count){12879/*Thedrivecan'tdomorethenmax_countatonce.
*/12880nbytes=wn->max_count;12881}1288212883/*Firstchecktoseeifareinitializationisneeded.
*/12884if(!
(wn->state&INITIALIZED)&&w_specify()!
=OK)return(EIO);1288512886/*Tellthecontrollertotransfernbytesbytes.
*/12887r=do_transfer(wn,wn->precomp,((nbytes>>SECTOR_SHIFT)&BYTE),12888block,opcode);1288912890while(r==OK&&nbytes>0){12891/*Foreachsector,waitforaninterruptandfetchthedataMINIXSOURCECODEFile:drivers/at_wini/at_wini.
c66312892*(read),orsupplydatatothecontrollerandwaitforan12893*interrupt(write).
12894*/1289512896if(opcode==DEV_GATHER){12897/*Firstaninterrupt,thendata.
*/12898if((r=at_intr_wait())!
=OK){12899/*Anerror,senddatatothebitbucket.
*/12900if(w_wn->w_status&STATUS_DRQ){12901if((s=sys_insw(wn->base_cmd+REG_DATA,SELF,tmp_buf,SECTOR_SIZE))!
=OK)12902panic(w_name(),"Calltosys_insw()failed",s);12903}12904break;12905}12906}1290712908/*Waitfordatatransferrequested.
*/12909if(!
w_waitfor(STATUS_DRQ,STATUS_DRQ)){r=ERR;break;}1291012911/*Copybytestoorfromthedevice'sbuffer.
*/12912if(opcode==DEV_GATHER){12913if((s=sys_insw(wn->base_cmd+REG_DATA,proc_nr,(void*)iov->iov_addr,SECTOR_SIZE))!
=OK)12914panic(w_name(),"Calltosys_insw()failed",s);12915}else{12916if((s=sys_outsw(wn->base_cmd+REG_DATA,proc_nr,(void*)iov->iov_addr,SECTOR_SIZE))!
=OK)12917panic(w_name(),"Calltosys_insw()failed",s);1291812919/*Datasent,waitforaninterrupt.
*/12920if((r=at_intr_wait())!
=OK)break;12921}1292212923/*Bookthebytessuccessfullytransferred.
*/12924nbytes-=SECTOR_SIZE;12925position+=SECTOR_SIZE;12926iov->iov_addr+=SECTOR_SIZE;12927if((iov->iov_size-=SECTOR_SIZE)==0){iov++;nr_req--;}12928}1292912930/*Anyerrors*/12931if(r!
=OK){12932/*Don'tretryifsectormarkedbadortoomanyerrors.
*/12933if(r==ERR_BAD_SECTOR||++errors==max_errors){12934w_command=CMD_IDLE;12935return(EIO);12936}12937}12938}1293912940w_command=CMD_IDLE;12941return(OK);12942}1294412945*com_out*1294612947PRIVATEintcom_out(cmd)12948structcommand*cmd;/*Commandblock*/12949{12950/*Outputthecommandblocktothewinchestercontrollerandreturnstatus*/12951664File:drivers/at_wini/at_wini.
cMINIXSOURCECODE12952structwini*wn=w_wn;12953unsignedbase_cmd=wn->base_cmd;12954unsignedbase_ctl=wn->base_ctl;12955pvb_pair_toutbyte[7];/*vectorforsys_voutb()*/12956ints;/*statusforsys_(v)outb()*/1295712958if(w_wn->state&IGNORING)returnERR;1295912960if(!
w_waitfor(STATUS_BSY,0)){12961printf("%s:controllernotready\n",w_name());12962return(ERR);12963}1296412965/*Selectdrive.
*/12966if((s=sys_outb(base_cmd+REG_LDH,cmd->ldh))!
=OK)12967panic(w_name(),"Couldn'twriteregistertoselectdrive",s);1296812969if(!
w_waitfor(STATUS_BSY,0)){12970printf("%s:com_out:drivenotready\n",w_name());12971return(ERR);12972}1297312974/*Scheduleawakeupcall,somecontrollersareflaky.
Thisisdonewith12975*asynchronousalarm.
IfatimeoutoccursaSYN_ALARMmessageissent12976*fromHARDWARE,sothatw_intr_wait()cancallw_timeout()incasethe12977*controllerwasnotabletoexecutethecommand.
Leftovertimeoutsare12978*simplyignoredbythemainloop.
12979*/12980sys_setalarm(wakeup_ticks,0);1298112982wn->w_status=STATUS_ADMBSY;12983w_command=cmd->command;12984pv_set(outbyte[0],base_ctl+REG_CTL,wn->pheads>=8CTL_EIGHTHEADS:0);12985pv_set(outbyte[1],base_cmd+REG_PRECOMP,cmd->precomp);12986pv_set(outbyte[2],base_cmd+REG_COUNT,cmd->count);12987pv_set(outbyte[3],base_cmd+REG_SECTOR,cmd->sector);12988pv_set(outbyte[4],base_cmd+REG_CYL_LO,cmd->cyl_lo);12989pv_set(outbyte[5],base_cmd+REG_CYL_HI,cmd->cyl_hi);12990pv_set(outbyte[6],base_cmd+REG_COMMAND,cmd->command);12991if((s=sys_voutb(outbyte,7))!
=OK)12992panic(w_name(),"Couldn'twriteregisterswithsys_voutb()",s);12993return(OK);12994}1299612997*w_need_reset*1299812999PRIVATEvoidw_need_reset()13000{13001/*Thecontrollerneedstobereset.
*/13002structwini*wn;13003intdr=0;1300413005for(wn=wini;wnbase_cmd==w_wn->base_cmd){13007wn->state|=DEAF;13008wn->state&=INITIALIZED;13009}13010}13011}MINIXSOURCECODEFile:drivers/at_wini/at_wini.
c6651301313014*w_do_close*1301513016PRIVATEintw_do_close(dp,m_ptr)13017structdriver*dp;13018message*m_ptr;13019{13020/*Deviceclose:Releaseadevice.
*/13021if(w_prepare(m_ptr->DEVICE)==NIL_DEV)13022return(ENXIO);13023w_wn->open_ct--;13024return(OK);13025}1302713028*com_simple*1302913030PRIVATEintcom_simple(cmd)13031structcommand*cmd;/*Commandblock*/13032{13033/*Asimplecontrollercommand,onlyoneinterruptandnodata-outphase.
*/13034intr;1303513036if(w_wn->state&IGNORING)returnERR;1303713038if((r=com_out(cmd))==OK)r=at_intr_wait();13039w_command=CMD_IDLE;13040return(r);13041}1304313044*w_timeout*1304513046PRIVATEvoidw_timeout(void)13047{13048structwini*wn=w_wn;1304913050switch(w_command){13051caseCMD_IDLE:13052break;/*fine*/13053caseCMD_READ:13054caseCMD_WRITE:13055/*Impossible,butnotonPC's:Thecontrollerdoesnotrespond.
*/1305613057/*LimitingmultisectorI/Oseemstohelp.
*/13058if(wn->max_count>8*SECTOR_SIZE){13059wn->max_count=8*SECTOR_SIZE;13060}else{13061wn->max_count=SECTOR_SIZE;13062}13063/*FALLTHROUGH*/13064default:13065/*Someothercommand.
*/13066if(w_testing)wn->state|=IGNORING;/*Kickoutthisdrive.
*/13067elseif(!
w_silent)printf("%s:timeoutoncommand%02x\n",w_name(),w_command);13068w_need_reset();13069wn->w_status=0;13070}13071}666File:drivers/at_wini/at_wini.
cMINIXSOURCECODE1307313074*w_reset*1307513076PRIVATEintw_reset()13077{13078/*Issuearesettothecontroller.
Thisisdoneafteranycatastrophe,13079*likethecontrollerrefusingtorespond.
13080*/13081ints;13082structwini*wn=w_wn;1308313084/*Don'tbotherifthisdriveisforgotten.
*/13085if(w_wn->state&IGNORING)returnERR;1308613087/*Waitforanyinternaldriverecovery.
*/13088tickdelay(RECOVERY_TICKS);1308913090/*Stroberesetbit*/13091if((s=sys_outb(wn->base_ctl+REG_CTL,CTL_RESET))!
=OK)13092panic(w_name(),"Couldn'tstroberesetbit",s);13093tickdelay(DELAY_TICKS);13094if((s=sys_outb(wn->base_ctl+REG_CTL,0))!
=OK)13095panic(w_name(),"Couldn'tstroberesetbit",s);13096tickdelay(DELAY_TICKS);1309713098/*Waitforcontrollerready*/13099if(!
w_waitfor(STATUS_BSY,0)){13100printf("%s:resetfailed,drivebusy\n",w_name());13101return(ERR);13102}1310313104/*Theerrorregistershouldbecheckednow,butsomedrivesmessitup.
*/1310513106for(wn=wini;wnbase_cmd==w_wn->base_cmd){13108wn->state&=DEAF;13109if(w_wn->irq_need_ack){13110/*Makesureirqisactuallyenabled.
.
*/13111sys_irqenable(&w_wn->irq_hook_id);13112}13113}13114}131151311613117return(OK);13118}1312013121*w_intr_wait*1312213123PRIVATEvoidw_intr_wait()13124{13125/*Waitforataskcompletioninterrupt.
*/1312613127messagem;1312813129if(w_wn->irq!
=NO_IRQ){13130/*Waitforaninterruptthatsetsw_statusto"notbusy".
*/13131while(w_wn->w_status&(STATUS_ADMBSY|STATUS_BSY)){MINIXSOURCECODEFile:drivers/at_wini/at_wini.
c66713132receive(ANY,&m);/*expectHARD_INTmessage*/13133if(m.
m_type==SYN_ALARM){/*butcheckfortimeout*/13134w_timeout();/*a.
o.
setw_status*/13135}elseif(m.
m_type==HARD_INT){13136sys_inb(w_wn->base_cmd+REG_STATUS,&w_wn->w_status);13137ack_irqs(m.
NOTIFY_ARG);13138}else{13139printf("AT_WINIgotunexpectedmessage%dfrom%d\n",13140m.
m_type,m.
m_source);13141}13142}13143}else{13144/*Interruptnotyetallocated;usepolling.
*/13145(void)w_waitfor(STATUS_BSY,0);13146}13147}1314913150*at_intr_wait*1315113152PRIVATEintat_intr_wait()13153{13154/*Waitforaninterrupt,studythestatusbitsandreturnerror/success.
*/13155intr;13156ints,inbval;/*readvaluewithsys_inb*/1315713158w_intr_wait();13159if((w_wn->w_status&(STATUS_BSY|STATUS_WF|STATUS_ERR))==0){13160r=OK;13161}else{13162if((s=sys_inb(w_wn->base_cmd+REG_ERROR,&inbval))!
=OK)13163panic(w_name(),"Couldn'treadregister",s);13164if((w_wn->w_status&STATUS_ERR)&&(inbval&ERROR_BB)){13165r=ERR_BAD_SECTOR;/*sectormarkedbad,retrieswon'thelp*/13166}else{13167r=ERR;/*anyothererror*/13168}13169}13170w_wn->w_status|=STATUS_ADMBSY;/*assumestillbusywithI/O*/13171return(r);13172}1317413175*w_waitfor*1317613177PRIVATEintw_waitfor(mask,value)13178intmask;/*statusmask*/13179intvalue;/*requiredstatus*/13180{13181/*Waituntilcontrollerisintherequiredstate.
Returnzeroontimeout.
13182*Analarmthatsetatimeoutflagisused.
TIMEOUTisinmicros,weneed13183*ticks.
Disablingthealarmisnotneeded,becauseastaticflagisused13184*andaleftovertimeoutcannotdoanyharm.
13185*/13186clock_tt0,t1;13187ints;13188getuptime(&t0);13189do{13190if((s=sys_inb(w_wn->base_cmd+REG_STATUS,&w_wn->w_status))!
=OK)13191panic(w_name(),"Couldn'treadregister",s);668File:drivers/at_wini/at_wini.
cMINIXSOURCECODE13192if((w_wn->w_status&mask)==value){13193return1;13194}13195}while((s=getuptime(&t1))==OK&&(t1-t0)state&ATAPI){/*Makeupsomenumbers.
*/13211entry->cylinders=div64u(wn->part[0].
dv_size,SECTOR_SIZE)/(64*32);13212entry->heads=64;13213entry->sectors=32;13214}else{/*Returnlogicalgeometry.
*/13215entry->cylinders=wn->lcylinders;13216entry->heads=wn->lheads;13217entry->sectors=wn->lsectors;13218}13219}1322113222*w_other*1322313224PRIVATEintw_other(dr,m)13225structdriver*dr;13226message*m;13227{13228intr,timeout,prev;1322913230if(m->m_type!
=DEV_IOCTL){13231returnEINVAL;13232}1323313234if(m->REQUEST==DIOCTIMEOUT){13235if((r=sys_datacopy(m->PROC_NR,(vir_bytes)m->ADDRESS,13236SELF,(vir_bytes)&timeout,sizeof(timeout)))!
=OK)13237returnr;1323813239if(timeout==0){13240/*Restoredefaults.
*/13241timeout_ticks=DEF_TIMEOUT_TICKS;13242max_errors=MAX_ERRORS;13243wakeup_ticks=WAKEUP;13244w_silent=0;13245}elseif(timeouttimeout)13259timeout_ticks=timeout;13260}1326113262if((r=sys_datacopy(SELF,(vir_bytes)&prev,13263m->PROC_NR,(vir_bytes)m->ADDRESS,sizeof(prev)))!
=OK)13264returnr;13265}1326613267returnOK;13268}elseif(m->REQUEST==DIOCOPENCT){13269intcount;13270if(w_prepare(m->DEVICE)==NIL_DEV)returnENXIO;13271count=w_wn->open_ct;13272if((r=sys_datacopy(SELF,(vir_bytes)&count,13273m->PROC_NR,(vir_bytes)m->ADDRESS,sizeof(count)))!
=OK)13274returnr;13275returnOK;13276}13277returnEINVAL;13278}1328013281*w_hw_int*1328213283PRIVATEintw_hw_int(dr,m)13284structdriver*dr;13285message*m;13286{13287/*Leftoverinterrupt(s)received;ackit/them.
*/13288ack_irqs(m->NOTIFY_ARG);1328913290returnOK;13291}1329413295*ack_irqs*1329613297PRIVATEvoidack_irqs(unsignedintirqs)13298{13299unsignedintdrive;13300for(drive=0;driveCC);13337ERRSTR(ID);13338ERRSTR(AC);13339ERRSTR(TK);13340ERRSTR(DM);1334113342returnstr;13343}drivers/tty/tty.
h13400/*tty.
h-Terminals*/1340113402#include1340313404/*FirstminornumbersforthevariousclassesofTTYdevices.
*/13405#defineCONS_MINOR013406#defineLOG_MINOR1513407#defineRS232_MINOR1613408#defineTTYPX_MINOR12813409#definePTYPX_MINOR1921341013411#defineLINEWRAP1/*console.
c-wraplinesatcolumn80*/1341213413#defineTTY_IN_BYTES256/*ttyinputqueuesize*/13414#defineTAB_SIZE8/*distancebetweentabstops*/13415#defineTAB_MASK7/*masktocomputeatabstopposition*/1341613417#defineESC'\33'/*escape*/1341813419#defineO_NOCTTY00400/*from,orccwillchoke*/MINIXSOURCECODEFile:drivers/tty/tty.
h67113420#defineO_NONBLOCK040001342113422structtty;13423typedef_PROTOTYPE(int(*devfun_t),(structtty*tp,inttry_only));13424typedef_PROTOTYPE(void(*devfunarg_t),(structtty*tp,intc));1342513426typedefstructtty{13427inttty_events;/*setwhenTTYshouldinspectthisline*/13428inttty_index;/*indexintoTTYtable*/13429inttty_minor;/*deviceminornumber*/1343013431/*Inputqueue.
Typedcharactersarestoredhereuntilreadbyaprogram.
*/13432u16_t*tty_inhead;/*pointertoplacewherenextchargoes*/13433u16_t*tty_intail;/*pointertonextchartobegiventoprog*/13434inttty_incount;/*#charsintheinputqueue*/13435inttty_eotct;/*numberof"linebreaks"ininputqueue*/13436devfun_ttty_devread;/*routinetoreadfromlowlevelbuffers*/13437devfun_ttty_icancel;/*cancelanydeviceinput*/13438inttty_min;/*minimumrequested#charsininputqueue*/13439timer_ttty_tmr;/*thetimerforthistty*/1344013441/*Outputsection.
*/13442devfun_ttty_devwrite;/*routinetostartactualdeviceoutput*/13443devfunarg_ttty_echo;/*routinetoechocharactersinput*/13444devfun_ttty_ocancel;/*cancelanyongoingdeviceoutput*/13445devfun_ttty_break;/*letthedevicesendabreak*/1344613447/*Terminalparametersandstatus.
*/13448inttty_position;/*currentpositiononthescreenforechoing*/13449chartty_reprint;/*1whenechoedinputmessedup,else0*/13450chartty_escaped;/*1whenLNEXT(V)justseen,else0*/13451chartty_inhibited;/*1whenSTOP(S)justseen(stopsoutput)*/13452chartty_pgrp;/*slotnumberofcontrollingprocess*/13453chartty_openct;/*countofnumberofopensofthistty*/1345413455/*InformationaboutincompleteI/Orequestsisstoredhere.
*/13456chartty_inrepcode;/*replycode,TASK_REPLYorREVIVE*/13457chartty_inrevived;/*setto1ifrevivecallbackispending*/13458chartty_incaller;/*processthatmadethecall(usuallyFS)*/13459chartty_inproc;/*processthatwantstoreadfromtty*/13460vir_bytestty_in_vir;/*virtualaddresswheredataistogo*/13461inttty_inleft;/*howmanycharsarestillneeded*/13462inttty_incum;/*#charsinputsofar*/13463chartty_outrepcode;/*replycode,TASK_REPLYorREVIVE*/13464chartty_outrevived;/*setto1ifrevivecallbackispending*/13465chartty_outcaller;/*processthatmadethecall(usuallyFS)*/13466chartty_outproc;/*processthatwantstowritetotty*/13467vir_bytestty_out_vir;/*virtualaddresswheredatacomesfrom*/13468inttty_outleft;/*#charsyettobeoutput*/13469inttty_outcum;/*#charsoutputsofar*/13470chartty_iocaller;/*processthatmadethecall(usuallyFS)*/13471chartty_ioproc;/*processthatwantstodoanioctl*/13472inttty_ioreq;/*ioctlrequestcode*/13473vir_bytestty_iovir;/*virtualaddressofioctlbuffer*/1347413475/*select()data*/13476inttty_select_ops;/*whichoperationsareinteresting*/13477inttty_select_proc;/*whichprocesswantsnotification*/1347813479/*Miscellaneous.
*/672File:drivers/tty/tty.
hMINIXSOURCECODE13480devfun_ttty_ioctl;/*setlinespeed,etc.
atthedevicelevel*/13481devfun_ttty_close;/*tellthedevicethatthettyisclosed*/13482void*tty_priv;/*pointertoperdeviceprivatedata*/13483structtermiostty_termios;/*terminalattributes*/13484structwinsizetty_winsize;/*windowsize(#linesand#columns)*/1348513486u16_ttty_inbuf[TTY_IN_BYTES];/*ttyinputbuffer*/1348713488}tty_t;1348913490/*Memoryallocatedintty.
c,soexternhere.
*/13491externtty_ttty_table[NR_CONS+NR_RS_LINES+NR_PTYS];13492externintccurrent;/*currentlyvisibleconsole*/13493externintirq_hook_id;/*hookidforkeyboardirq*/1349413495externunsignedlongkbd_irq_set;13496externunsignedlongrs_irq_set;1349713498/*Valuesforthefields.
*/13499#defineNOT_ESCAPED0/*previouscharacterisnotLNEXT(V)*/13500#defineESCAPED1/*previouscharacterwasLNEXT(V)*/13501#defineRUNNING0/*noSTOP(S)hasbeentypedtostopoutput*/13502#defineSTOPPED1/*STOP(S)hasbeentypedtostopoutput*/1350313504/*Fieldsandflagsoncharactersintheinputqueue.
*/13505#defineIN_CHAR0x00FF/*low8bitsarethecharacteritself*/13506#defineIN_LEN0x0F00/*lengthofcharifithasbeenechoed*/13507#defineIN_LSHIFT8/*length=(c&IN_LEN)>>IN_LSHIFT*/13508#defineIN_EOT0x1000/*charisalinebreak(D,LF)*/13509#defineIN_EOF0x2000/*charisEOF(D),donotreturntouser*/13510#defineIN_ESC0x4000/*escapedbyLNEXT(V),nointerpretation*/1351113512/*Timesandtimeouts.
*/13513#defineforce_timeout()((void)(0))1351413515/*Memoryallocatedintty.
c,soexternhere.
*/13516externtimer_t*tty_timers;/*queueofTTYtimers*/13517externclock_ttty_next_timeout;/*nextTTYtimeout*/1351813519/*Numberofelementsandlimitofabuffer.
*/13520#definebuflen(buf)(sizeof(buf)/sizeof((buf)[0]))13521#definebufend(buf)((buf)+buflen(buf))1352213523/*Memoryallocatedintty.
c,soexternhere.
*/13524externstructmachinemachine;/*machineinformation(a.
o.
:pc_at,ega)*/1352513526/*FunctionprototypesforTTYdriver.
*/13527/*tty.
c*/13528_PROTOTYPE(voidhandle_events,(structtty*tp));13529_PROTOTYPE(voidsigchar,(structtty*tp,intsig));13530_PROTOTYPE(voidtty_task,(void));13531_PROTOTYPE(intin_process,(structtty*tp,char*buf,intcount));13532_PROTOTYPE(voidout_process,(structtty*tp,char*bstart,char*bpos,13533char*bend,int*icount,int*ocount));13534_PROTOTYPE(voidtty_wakeup,(clock_tnow));13535_PROTOTYPE(voidtty_reply,(intcode,intreplyee,intproc_nr,13536intstatus));13537_PROTOTYPE(inttty_devnop,(structtty*tp,inttry));13538_PROTOTYPE(intselect_try,(structtty*tp,intops));13539_PROTOTYPE(intselect_retry,(structtty*tp));MINIXSOURCECODEFile:drivers/tty/tty.
h6731354013541/*console.
c*/13542_PROTOTYPE(voidkputc,(intc));13543_PROTOTYPE(voidcons_stop,(void));13544_PROTOTYPE(voiddo_new_kmess,(message*m));13545_PROTOTYPE(voiddo_diagnostics,(message*m));13546_PROTOTYPE(voidscr_init,(structtty*tp));13547_PROTOTYPE(voidtoggle_scroll,(void));13548_PROTOTYPE(intcon_loadfont,(message*m));13549_PROTOTYPE(voidselect_console,(intcons_line));1355013551/*keyboard.
c*/13552_PROTOTYPE(voidkb_init,(structtty*tp));13553_PROTOTYPE(voidkb_init_once,(void));13554_PROTOTYPE(intkbd_loadmap,(message*m));13555_PROTOTYPE(voiddo_panic_dumps,(message*m));13556_PROTOTYPE(voiddo_fkey_ctl,(message*m));13557_PROTOTYPE(voidkbd_interrupt,(message*m));1355813559/*vidcopy.
s*/13560_PROTOTYPE(voidvid_vid_copy,(unsignedsrc,unsigneddst,unsignedcount));13561_PROTOTYPE(voidmem_vid_copy,(u16_t*src,unsigneddst,unsignedcount));drivers/tty/tty.
c13600/*Thisfilecontainstheterminaldriver,bothfortheIBMconsoleandregular13601*ASCIIterminals.
Ithandlesonlythedevice-independentpartofaTTY,the13602*devicedependentpartsareinconsole.
c,rs232.
c,etc.
Thisfilecontains13603*twomainentrypoints,tty_task()andtty_wakeup(),andseveralminorentry13604*pointsforusebythedevice-dependentcode.
13605*13606*Thedevice-independentpartaccepts"keyboard"inputfromthedevice-13607*dependentpart,performsinputprocessing(specialkeyinterpretation),13608*andsendstheinputtoaprocessreadingfromtheTTY.
OutputtoaTTY13609*issenttothedevice-dependentcodeforoutputprocessingand"screen"13610*display.
Inputprocessingisdonebythedevicebycalling'in_process'13611*ontheinputcharacters,outputprocessingmaybedonebythedeviceitself13612*orbycalling'out_process'.
TheTTYtakescareofinputqueuing,the13613*devicedoestheoutputqueuing.
Ifadevicereceivesanexternalsignal,13614*likeaninterrupt,thenitcausestty_wakeup()toberunbytheCLOCKtask13615*to,youguessedit,wakeuptheTTYtocheckifinputoroutputcan13616*continue.
13617*13618*Thevalidmessagesandtheirparametersare:13619*13620*HARD_INT:outputhasbeencompletedorinputhasarrived13621*SYS_SIG:e.
g.
,MINIXwantstoshutdown;runcodetocleanlystop13622*DEV_READ:aprocesswantstoreadfromaterminal13623*DEV_WRITE:aprocesswantstowriteonaterminal13624*DEV_IOCTL:aprocesswantstochangeaterminal'sparameters13625*DEV_OPEN:attylinehasbeenopened13626*DEV_CLOSE:attylinehasbeenclosed13627*DEV_SELECT:startselectnotificationrequest13628*DEV_STATUS:FSwantstoknowstatusforSELECTorREVIVE13629*CANCEL:terminateapreviousincompletesystemcallimmediately674File:drivers/tty/tty.
cMINIXSOURCECODE13630*13631*m_typeTTY_LINEPROC_NRCOUNTTTY_SPEKTTY_FLAGSADDRESS1363213633*|HARD_INT1363413635*|SYS_SIG|sigset1363613637*|DEV_READ|minordev|procnr|count|O_NONBLOCK|bufptr|1363813639*|DEV_WRITE|minordev|procnr|count|||bufptr|1364013641*|DEV_IOCTL|minordev|procnr|funccode|eraseetc|flags||1364213643*|DEV_OPEN|minordev|procnr|O_NOCTTY||||1364413645*|DEV_CLOSE|minordev|procnr1364613647*|DEV_STATUS1364813649*|CANCEL|minordev|procnr1365013651*13652*Changes:13653*Jan20,2004movedTTYdrivertouser-space(JorritN.
Herder)13654*Sep20,2004localtimermanagement/syncalarms(JorritN.
Herder)13655*Jul13,2004supportforfunctionkeyobservers(JorritN.
Herder)13656*/1365713658#include".
.
/drivers.
h"13659#include".
.
/drivers.
h"13660#include13661#include13662#include13663#include13664#include13665#include"tty.
h"1366613667#include13668#include1366913670externintirq_hook_id;1367113672unsignedlongkbd_irq_set=0;13673unsignedlongrs_irq_set=0;1367413675/*Addressofattystructure.
*/13676#definetty_addr(line)(&tty_table[line])1367713678/*Macrosformagicttytypes.
*/13679#defineisconsole(tp)((tp)=tty_addr(NR_CONS+NR_RS_LINES))1368113682/*Macrosformagicttystructurepointers.
*/13683#defineFIRST_TTYtty_addr(0)13684#defineEND_TTYtty_addr(sizeof(tty_table)/sizeof(tty_table[0]))1368513686/*Adeviceexistsifatleastits'devread'functionisdefined.
*/13687#definetty_active(tp)((tp)->tty_devread!
=NULL)1368813689/*RS232linesorpseudoterminalscanbecompletelyconfiguredout.
*/MINIXSOURCECODEFile:drivers/tty/tty.
c67513690#ifNR_RS_LINES==013691#definers_init(tp)((void)0)13692#endif13693#ifNR_PTYS==013694#definepty_init(tp)((void)0)13695#definedo_pty(tp,mp)((void)0)13696#endif1369713698FORWARD_PROTOTYPE(voidtty_timed_out,(timer_t*tp));13699FORWARD_PROTOTYPE(voidexpire_timers,(void));13700FORWARD_PROTOTYPE(voidsettimer,(tty_t*tty_ptr,intenable));13701FORWARD_PROTOTYPE(voiddo_cancel,(tty_t*tp,message*m_ptr));13702FORWARD_PROTOTYPE(voiddo_ioctl,(tty_t*tp,message*m_ptr));13703FORWARD_PROTOTYPE(voiddo_open,(tty_t*tp,message*m_ptr));13704FORWARD_PROTOTYPE(voiddo_close,(tty_t*tp,message*m_ptr));13705FORWARD_PROTOTYPE(voiddo_read,(tty_t*tp,message*m_ptr));13706FORWARD_PROTOTYPE(voiddo_write,(tty_t*tp,message*m_ptr));13707FORWARD_PROTOTYPE(voiddo_select,(tty_t*tp,message*m_ptr));13708FORWARD_PROTOTYPE(voiddo_status,(message*m_ptr));13709FORWARD_PROTOTYPE(voidin_transfer,(tty_t*tp));13710FORWARD_PROTOTYPE(inttty_echo,(tty_t*tp,intch));13711FORWARD_PROTOTYPE(voidrawecho,(tty_t*tp,intch));13712FORWARD_PROTOTYPE(intback_over,(tty_t*tp));13713FORWARD_PROTOTYPE(voidreprint,(tty_t*tp));13714FORWARD_PROTOTYPE(voiddev_ioctl,(tty_t*tp));13715FORWARD_PROTOTYPE(voidsetattr,(tty_t*tp));13716FORWARD_PROTOTYPE(voidtty_icancel,(tty_t*tp));13717FORWARD_PROTOTYPE(voidtty_init,(void));1371813719/*Defaultattributes.
*/13720PRIVATEstructtermiostermios_defaults={13721TINPUT_DEF,TOUTPUT_DEF,TCTRL_DEF,TLOCAL_DEF,TSPEED_DEF,TSPEED_DEF,13722{13723TEOF_DEF,TEOL_DEF,TERASE_DEF,TINTR_DEF,TKILL_DEF,TMIN_DEF,13724TQUIT_DEF,TTIME_DEF,TSUSP_DEF,TSTART_DEF,TSTOP_DEF,13725TREPRINT_DEF,TLNEXT_DEF,TDISCARD_DEF,13726},13727};13728PRIVATEstructwinsizewinsize_defaults;/*=allzeroes*/1372913730/*GlobalvariablesfortheTTYtask(declaredexternintty.
h).
*/13731PUBLICtty_ttty_table[NR_CONS+NR_RS_LINES+NR_PTYS];13732PUBLICintccurrent;/*currentlyactiveconsole*/13733PUBLICtimer_t*tty_timers;/*queueofTTYtimers*/13734PUBLICclock_ttty_next_timeout;/*timethatthenextalarmisdue*/13735PUBLICstructmachinemachine;/*kernelenvironmentvariables*/137361373713738*tty_task*1373913740PUBLICvoidmain(void)13741{13742/*Mainroutineoftheterminaltask.
*/1374313744messagetty_mess;/*bufferforallincomingmessages*/13745unsignedline;13746ints;13747char*types[]={"task","driver","server","user"};13748registerstructproc*rp;13749registertty_t*tp;676File:drivers/tty/tty.
cMINIXSOURCECODE1375013751/*InitializetheTTYdriver.
*/13752tty_init();1375313754/*Getkernelenvironment(protected_mode,pc_atandegaareneeded).
*/13755if(OK!
=(s=sys_getmachine(&machine))){13756panic("TTY","Couldn'tobtainkernelenvironment.
",s);13757}1375813759/*Finalone-timekeyboardinitialization.
*/13760kb_init_once();1376113762printf("\n");1376313764while(TRUE){1376513766/*Checkforandhandleanyeventsonanyofthettys.
*/13767for(tp=FIRST_TTY;tptty_events)handle_events(tp);13769}1377013771/*Getarequestmessage.
*/13772receive(ANY,&tty_mess);1377313774/*FirsthandleallkernelnotificationtypesthattheTTYsupports.
13775*-Analarmwentoff,expirealltimersandhandletheevents.
13776*-Ahardwareinterruptalsoisaninvitationtocheckforevents.
13777*-Anewkernelmessageisavailableforprinting.
13778*-Resettheconsoleonsystemshutdown.
13779*Thenseeifthismessageisdifferentfromanormaldevicedriver13780*requestandshouldbehandledseparately.
Theseextrafunctions13781*donotoperateonadevice,inconstrasttothedriverrequests.
13782*/13783switch(tty_mess.
m_type){13784caseSYN_ALARM:/*fallthrough*/13785expire_timers();/*runwatchdogsofexpiredtimers*/13786continue;/*continetocheckforevents*/13787caseHARD_INT:{/*hardwareinterruptnotification*/13788if(tty_mess.
NOTIFY_ARG&kbd_irq_set)13789kbd_interrupt(&tty_mess);/*fetchcharsfromkeyboard*/13790#ifNR_RS_LINES>013791if(tty_mess.
NOTIFY_ARG&rs_irq_set)13792rs_interrupt(&tty_mess);/*serialI/O*/13793#endif13794expire_timers();/*runwatchdogsofexpiredtimers*/13795continue;/*continetocheckforevents*/13796}13797caseSYS_SIG:{/*systemsignal*/13798sigset_tsigset=(sigset_t)tty_mess.
NOTIFY_ARG;1379913800if(sigismember(&sigset,SIGKSTOP)){13801cons_stop();/*switchtoprimaryconsole*/13802if(irq_hook_id!
=-1){13803sys_irqdisable(&irq_hook_id);13804sys_irqrmpolicy(KEYBOARD_IRQ,&irq_hook_id);13805}13806}13807if(sigismember(&sigset,SIGTERM))cons_stop();13808if(sigismember(&sigset,SIGKMESS))do_new_kmess(&tty_mess);13809continue;MINIXSOURCECODEFile:drivers/tty/tty.
c67713810}13811casePANIC_DUMPS:/*allowpanicdumps*/13812cons_stop();/*switchtoprimaryconsole*/13813do_panic_dumps(&tty_mess);13814continue;13815caseDIAGNOSTICS:/*aserverwantstoprintsome*/13816do_diagnostics(&tty_mess);13817continue;13818caseFKEY_CONTROL:/*(un)registerafkeyobserver*/13819do_fkey_ctl(&tty_mess);13820continue;13821default:/*shouldbeadriverrequest*/13822;/*donothing;endswitch*/13823}1382413825/*Onlydevicerequestsshouldgettothispoint.
Allrequests,13826*exceptDEV_STATUS,haveaminordevicenumber.
Checkthis13827*exceptionandgettheminordevicenumberotherwise.
13828*/13829if(tty_mess.
m_type==DEV_STATUS){13830do_status(&tty_mess);13831continue;13832}13833line=tty_mess.
TTY_LINE;13834if((line-CONS_MINOR)tty_select_ops))&&13897tp->tty_select_proc==m_ptr->m_source){1389813899/*I/Oforaselectedminordeviceisready.
*/13900m_ptr->m_type=DEV_IO_READY;13901m_ptr->DEV_MINOR=tp->tty_index;13902m_ptr->DEV_SEL_OPS=ops;1390313904tp->tty_select_ops&=ops;/*unmarkselectevent*/13905event_found=1;13906break;13907}13908elseif(tp->tty_inrevived&&tp->tty_incaller==m_ptr->m_source){1390913910/*Suspendedrequestfinished.
SendaREVIVE.
*/13911m_ptr->m_type=DEV_REVIVE;13912m_ptr->REP_PROC_NR=tp->tty_inproc;13913m_ptr->REP_STATUS=tp->tty_incum;1391413915tp->tty_inleft=tp->tty_incum=0;13916tp->tty_inrevived=0;/*unmarkreviveevent*/13917event_found=1;13918break;13919}13920elseif(tp->tty_outrevived&&tp->tty_outcaller==m_ptr->m_source){1392113922/*Suspendedrequestfinished.
SendaREVIVE.
*/13923m_ptr->m_type=DEV_REVIVE;13924m_ptr->REP_PROC_NR=tp->tty_outproc;13925m_ptr->REP_STATUS=tp->tty_outcum;1392613927tp->tty_outcum=0;13928tp->tty_outrevived=0;/*unmarkreviveevent*/13929event_found=1;MINIXSOURCECODEFile:drivers/tty/tty.
c67913930break;13931}13932}1393313934#ifNR_PTYS>013935if(!
event_found)13936event_found=pty_status(m_ptr);13937#endif1393813939if(!
event_found){13940/*Noeventsofinterestwerefound.
Returnanemptymessage.
*/13941m_ptr->m_type=DEV_NO_STATUS;13942}1394313944/*Almostdone.
Sendbackthereplymessagetothecaller.
*/13945if((status=send(m_ptr->m_source,m_ptr))!
=OK){13946panic("TTY","sendindo_statusfailed,status\n",status);13947}13948}1395013951*do_read*1395213953PRIVATEvoiddo_read(tp,m_ptr)13954registertty_t*tp;/*pointertottystruct*/13955registermessage*m_ptr;/*pointertomessagesenttothetask*/13956{13957/*Aprocesswantstoreadfromaterminal.
*/13958intr,status;13959phys_bytesphys_addr;1396013961/*Checkifthereisalreadyaprocesshanginginaread,checkifthe13962*parametersarecorrect,doI/O.
13963*/13964if(tp->tty_inleft>0){13965r=EIO;13966}else13967if(m_ptr->COUNTPROC_NR,D,(vir_bytes)m_ptr->ADDRESS,m_ptr->COUNT,13971&phys_addr)!
=OK){13972r=EFAULT;13973}else{13974/*Copyinformationfromthemessagetothettystruct.
*/13975tp->tty_inrepcode=TASK_REPLY;13976tp->tty_incaller=m_ptr->m_source;13977tp->tty_inproc=m_ptr->PROC_NR;13978tp->tty_in_vir=(vir_bytes)m_ptr->ADDRESS;13979tp->tty_inleft=m_ptr->COUNT;1398013981if(!
(tp->tty_termios.
c_lflag&ICANON)13982&&tp->tty_termios.
c_cc[VTIME]>0){13983if(tp->tty_termios.
c_cc[VMIN]==0){13984/*MIN&TIMEspecifyareadtimerthatfinishesthe13985*readinTIME/10secondsifnobytesareavailable.
13986*/13987settimer(tp,TRUE);13988tp->tty_min=1;13989}else{680File:drivers/tty/tty.
cMINIXSOURCECODE13990/*MIN&TIMEspecifyaninter-bytetimerthatmay13991*havetobecancellediftherearenobytesyet.
13992*/13993if(tp->tty_eotct==0){13994settimer(tp,FALSE);13995tp->tty_min=tp->tty_termios.
c_cc[VMIN];13996}13997}13998}1399914000/*AnythingwaitingintheinputbufferClearitout.
.
.
*/14001in_transfer(tp);14002/*.
.
.
thengobackformore.
*/14003handle_events(tp);14004if(tp->tty_inleft==0){14005if(tp->tty_select_ops)14006select_retry(tp);14007return;/*alreadydone*/14008}1400914010/*Therewerenobytesintheinputqueueavailable,soeithersuspend14011*thecallerorbreakoffthereadifnonblocking.
14012*/14013if(m_ptr->TTY_FLAGS&O_NONBLOCK){14014r=EAGAIN;/*canceltheread*/14015tp->tty_inleft=tp->tty_incum=0;14016}else{14017r=SUSPEND;/*suspendthecaller*/14018tp->tty_inrepcode=REVIVE;14019}14020}14021tty_reply(TASK_REPLY,m_ptr->m_source,m_ptr->PROC_NR,r);14022if(tp->tty_select_ops)14023select_retry(tp);14024}1402614027*do_write*1402814029PRIVATEvoiddo_write(tp,m_ptr)14030registertty_t*tp;14031registermessage*m_ptr;/*pointertomessagesenttothetask*/14032{14033/*Aprocesswantstowriteonaterminal.
*/14034intr;14035phys_bytesphys_addr;1403614037/*Checkifthereisalreadyaprocesshanginginawrite,checkifthe14038*parametersarecorrect,doI/O.
14039*/14040if(tp->tty_outleft>0){14041r=EIO;14042}else14043if(m_ptr->COUNTPROC_NR,D,(vir_bytes)m_ptr->ADDRESS,m_ptr->COUNT,14047&phys_addr)!
=OK){14048r=EFAULT;14049}else{MINIXSOURCECODEFile:drivers/tty/tty.
c68114050/*Copymessageparameterstothettystructure.
*/14051tp->tty_outrepcode=TASK_REPLY;14052tp->tty_outcaller=m_ptr->m_source;14053tp->tty_outproc=m_ptr->PROC_NR;14054tp->tty_out_vir=(vir_bytes)m_ptr->ADDRESS;14055tp->tty_outleft=m_ptr->COUNT;1405614057/*Trytowrite.
*/14058handle_events(tp);14059if(tp->tty_outleft==0)14060return;/*alreadydone*/1406114062/*Noneornotallthebytescouldbewritten,soeithersuspendthe14063*callerorbreakoffthewriteifnonblocking.
14064*/14065if(m_ptr->TTY_FLAGS&O_NONBLOCK){/*cancelthewrite*/14066r=tp->tty_outcum>0tp->tty_outcum:EAGAIN;14067tp->tty_outleft=tp->tty_outcum=0;14068}else{14069r=SUSPEND;/*suspendthecaller*/14070tp->tty_outrepcode=REVIVE;14071}14072}14073tty_reply(TASK_REPLY,m_ptr->m_source,m_ptr->PROC_NR,r);14074}1407614077*do_ioctl*1407814079PRIVATEvoiddo_ioctl(tp,m_ptr)14080registertty_t*tp;14081message*m_ptr;/*pointertomessagesenttotask*/14082{14083/*PerformanIOCTLonthisterminal.
Posixtermioscallsarehandled14084*bytheIOCTLsystemcall14085*/1408614087intr;14088union{14089inti;14090}param;14091size_tsize;1409214093/*Sizeoftheioctlparameter.
*/14094switch(m_ptr->TTY_REQUEST){14095caseTCGETS:/*Posixtcgetattrfunction*/14096caseTCSETS:/*Posixtcsetattrfunction,TCSANOWoption*/14097caseTCSETSW:/*Posixtcsetattrfunction,TCSADRAINoption*/14098caseTCSETSF:/*Posixtcsetattrfunction,TCSAFLUSHoption*/14099size=sizeof(structtermios);14100break;1410114102caseTCSBRK:/*Posixtcsendbreakfunction*/14103caseTCFLOW:/*Posixtcflowfunction*/14104caseTCFLSH:/*Posixtcflushfunction*/14105caseTIOCGPGRP:/*Posixtcgetpgrpfunction*/14106caseTIOCSPGRP:/*Posixtcsetpgrpfunction*/14107size=sizeof(int);14108break;14109682File:drivers/tty/tty.
cMINIXSOURCECODE14110caseTIOCGWINSZ:/*getwindowsize(notPosix)*/14111caseTIOCSWINSZ:/*setwindowsize(notPosix)*/14112size=sizeof(structwinsize);14113break;1411414115caseKIOCSMAP:/*loadkeymap(Minixextension)*/14116size=sizeof(keymap_t);14117break;1411814119caseTIOCSFON:/*loadfont(Minixextension)*/14120size=sizeof(u8_t[8192]);14121break;1412214123caseTCDRAIN:/*Posixtcdrainfunction--noparameter*/14124default:size=0;14125}1412614127r=OK;14128switch(m_ptr->TTY_REQUEST){14129caseTCGETS:14130/*Getthetermiosattributes.
*/14131r=sys_vircopy(SELF,D,(vir_bytes)&tp->tty_termios,14132m_ptr->PROC_NR,D,(vir_bytes)m_ptr->ADDRESS,14133(vir_bytes)size);14134break;1413514136caseTCSETSW:14137caseTCSETSF:14138caseTCDRAIN:14139if(tp->tty_outleft>0){14140/*Waitforallongoingoutputprocessingtofinish.
*/14141tp->tty_iocaller=m_ptr->m_source;14142tp->tty_ioproc=m_ptr->PROC_NR;14143tp->tty_ioreq=m_ptr->REQUEST;14144tp->tty_iovir=(vir_bytes)m_ptr->ADDRESS;14145r=SUSPEND;14146break;14147}14148if(m_ptr->TTY_REQUEST==TCDRAIN)break;14149if(m_ptr->TTY_REQUEST==TCSETSF)tty_icancel(tp);14150/*FALLTHROUGH*/14151caseTCSETS:14152/*Setthetermiosattributes.
*/14153r=sys_vircopy(m_ptr->PROC_NR,D,(vir_bytes)m_ptr->ADDRESS,14154SELF,D,(vir_bytes)&tp->tty_termios,(vir_bytes)size);14155if(r!
=OK)break;14156setattr(tp);14157break;1415814159caseTCFLSH:14160r=sys_vircopy(m_ptr->PROC_NR,D,(vir_bytes)m_ptr->ADDRESS,14161SELF,D,(vir_bytes)¶m.
i,(vir_bytes)size);14162if(r!
=OK)break;14163switch(param.
i){14164caseTCIFLUSH:tty_icancel(tp);break;14165caseTCOFLUSH:(*tp->tty_ocancel)(tp,0);break;14166caseTCIOFLUSH:tty_icancel(tp);(*tp->tty_ocancel)(tp,0);break;14167default:r=EINVAL;14168}14169break;MINIXSOURCECODEFile:drivers/tty/tty.
c6831417014171caseTCFLOW:14172r=sys_vircopy(m_ptr->PROC_NR,D,(vir_bytes)m_ptr->ADDRESS,14173SELF,D,(vir_bytes)¶m.
i,(vir_bytes)size);14174if(r!
=OK)break;14175switch(param.
i){14176caseTCOOFF:14177caseTCOON:14178tp->tty_inhibited=(param.
i==TCOOFF);14179tp->tty_events=1;14180break;14181caseTCIOFF:14182(*tp->tty_echo)(tp,tp->tty_termios.
c_cc[VSTOP]);14183break;14184caseTCION:14185(*tp->tty_echo)(tp,tp->tty_termios.
c_cc[VSTART]);14186break;14187default:14188r=EINVAL;14189}14190break;1419114192caseTCSBRK:14193if(tp->tty_break!
=NULL)(*tp->tty_break)(tp,0);14194break;1419514196caseTIOCGWINSZ:14197r=sys_vircopy(SELF,D,(vir_bytes)&tp->tty_winsize,14198m_ptr->PROC_NR,D,(vir_bytes)m_ptr->ADDRESS,14199(vir_bytes)size);14200break;1420114202caseTIOCSWINSZ:14203r=sys_vircopy(m_ptr->PROC_NR,D,(vir_bytes)m_ptr->ADDRESS,14204SELF,D,(vir_bytes)&tp->tty_winsize,(vir_bytes)size);14205/*SIGWINCH.
.
.
*/14206break;1420714208caseKIOCSMAP:14209/*Loadanewkeymap(only/dev/console).
*/14210if(isconsole(tp))r=kbd_loadmap(m_ptr);14211break;1421214213caseTIOCSFON:14214/*LoadafontintoanEGAorVGAcard(hs@hck.
hr)*/14215if(isconsole(tp))r=con_loadfont(m_ptr);14216break;1421714218/*ThesePosixfunctionsareallowedtofailif_POSIX_JOB_CONTROLis14219*notdefined.
14220*/14221caseTIOCGPGRP:14222caseTIOCSPGRP:14223default:14224r=ENOTTY;14225}1422614227/*Sendthereply.
*/14228tty_reply(TASK_REPLY,m_ptr->m_source,m_ptr->PROC_NR,r);14229}684File:drivers/tty/tty.
cMINIXSOURCECODE1423114232*do_open*1423314234PRIVATEvoiddo_open(tp,m_ptr)14235registertty_t*tp;14236message*m_ptr;/*pointertomessagesenttotask*/14237{14238/*Attylinehasbeenopened.
Makeitthecallerscontrollingttyif14239*O_NOCTTYis*not*setanditisnotthelogdevice.
1isreturnedif14240*thettyismadethecontrollingtty,otherwiseOKoranerrorcode.
14241*/14242intr=OK;1424314244if(m_ptr->TTY_LINE==LOG_MINOR){14245/*Thelogdeviceisawrite-onlydiagnosticsdevice.
*/14246if(m_ptr->COUNT&R_BIT)r=EACCES;14247}else{14248if(!
(m_ptr->COUNT&O_NOCTTY)){14249tp->tty_pgrp=m_ptr->PROC_NR;14250r=1;14251}14252tp->tty_openct++;14253}14254tty_reply(TASK_REPLY,m_ptr->m_source,m_ptr->PROC_NR,r);14255}1425714258*do_close*1425914260PRIVATEvoiddo_close(tp,m_ptr)14261registertty_t*tp;14262message*m_ptr;/*pointertomessagesenttotask*/14263{14264/*Attylinehasbeenclosed.
Cleanupthelineifitisthelastclose.
*/1426514266if(m_ptr->TTY_LINE!
=LOG_MINOR&&--tp->tty_openct==0){14267tp->tty_pgrp=0;14268tty_icancel(tp);14269(*tp->tty_ocancel)(tp,0);14270(*tp->tty_close)(tp,0);14271tp->tty_termios=termios_defaults;14272tp->tty_winsize=winsize_defaults;14273setattr(tp);14274}14275tty_reply(TASK_REPLY,m_ptr->m_source,m_ptr->PROC_NR,OK);14276}1427814279*do_cancel*1428014281PRIVATEvoiddo_cancel(tp,m_ptr)14282registertty_t*tp;14283message*m_ptr;/*pointertomessagesenttotask*/14284{14285/*Asignalhasbeensenttoaprocessthatishangingtryingtoreadorwrite.
14286*Thependingreadorwritemustbefinishedoffimmediately.
14287*/1428814289intproc_nr;MINIXSOURCECODEFile:drivers/tty/tty.
c68514290intmode;1429114292/*Checktheparameterscarefully,toavoidcancellingtwice.
*/14293proc_nr=m_ptr->PROC_NR;14294mode=m_ptr->COUNT;14295if((mode&R_BIT)&&tp->tty_inleft!
=0&&proc_nr==tp->tty_inproc){14296/*Processwasreadingwhenkilled.
Cleanupinput.
*/14297tty_icancel(tp);14298tp->tty_inleft=tp->tty_incum=0;14299}14300if((mode&W_BIT)&&tp->tty_outleft!
=0&&proc_nr==tp->tty_outproc){14301/*Processwaswritingwhenkilled.
Cleanupoutput.
*/14302(*tp->tty_ocancel)(tp,0);14303tp->tty_outleft=tp->tty_outcum=0;14304}14305if(tp->tty_ioreq!
=0&&proc_nr==tp->tty_ioproc){14306/*Processwaswaitingforoutputtodrain.
*/14307tp->tty_ioreq=0;14308}14309tp->tty_events=1;14310tty_reply(TASK_REPLY,m_ptr->m_source,proc_nr,EINTR);14311}14313PUBLICintselect_try(structtty*tp,intops)14314{14315intready_ops=0;1431614317/*Specialcase.
Iflineishungup,nooperationswillblock.
14318*(anditcanbeseenasanexceptionalcondition.
)14319*/14320if(tp->tty_termios.
c_ospeed==B0){14321ready_ops|=ops;14322}1432314324if(ops&SEL_RD){14325/*willi/onotblockonread*/14326if(tp->tty_inleft>0){14327ready_ops|=SEL_RD;/*EIO-noblocking*/14328}elseif(tp->tty_incount>0){14329/*Isaregularreadpossibletty_incount14330*saysthereisdata.
Butareadwillonlysucceed14331*incanonicalmodeifanewlinehasbeenseen.
14332*/14333if(!
(tp->tty_termios.
c_lflag&ICANON)||14334tp->tty_eotct>0){14335ready_ops|=SEL_RD;14336}14337}14338}1433914340if(ops&SEL_WR){14341if(tp->tty_outleft>0)ready_ops|=SEL_WR;14342elseif((*tp->tty_devwrite)(tp,1))ready_ops|=SEL_WR;14343}1434414345returnready_ops;14346}14348PUBLICintselect_retry(structtty*tp)14349{686File:drivers/tty/tty.
cMINIXSOURCECODE14350if(select_try(tp,tp->tty_select_ops))14351notify(tp->tty_select_proc);14352returnOK;14353}1435514356*handle_events*1435714358PUBLICvoidhandle_events(tp)14359tty_t*tp;/*TTYtocheckforevents.
*/14360{14361/*HandleanyeventspendingonaTTY.
Theseeventsareusuallydevice14362*interrupts.
14363*14364*Twokindsofeventsareprominent:14365*-acharacterhasbeenreceivedfromtheconsoleoranRS232line.
14366*-anRS232linehascompletedawriterequest(onbehalfofauser).
14367*Theinterrupthandlermaydelaytheinterruptmessageatitsdiscretion14368*toavoidswampingtheTTYtask.
Messagesmaybeoverwrittenwhenthe14369*linesarefastorwhenthereareracesbetweendifferentlines,input14370*andoutput,becauseMINIXonlyprovidessinglebufferingforinterrupt14371*messages(inproc.
c).
Thisishandledbyexplicitlycheckingeachline14372*forfreshinputandcompletedoutputoneachinterrupt.
14373*/14374char*buf;14375unsignedcount;14376intstatus;1437714378do{14379tp->tty_events=0;1438014381/*Readinputandperforminputprocessing.
*/14382(*tp->tty_devread)(tp,0);1438314384/*Performoutputprocessingandwriteoutput.
*/14385(*tp->tty_devwrite)(tp,0);1438614387/*Ioctlwaitingforsomeevent*/14388if(tp->tty_ioreq!
=0)dev_ioctl(tp);14389}while(tp->tty_events);1439014391/*Transfercharactersfromtheinputqueuetoawaitingprocess.
*/14392in_transfer(tp);1439314394/*Replyifenoughbytesareavailable.
*/14395if(tp->tty_incum>=tp->tty_min&&tp->tty_inleft>0){14396if(tp->tty_inrepcode==REVIVE){14397notify(tp->tty_incaller);14398tp->tty_inrevived=1;14399}else{14400tty_reply(tp->tty_inrepcode,tp->tty_incaller,14401tp->tty_inproc,tp->tty_incum);14402tp->tty_inleft=tp->tty_incum=0;14403}14404}14405if(tp->tty_select_ops)14406select_retry(tp);14407#ifNR_PTYS>014408if(ispty(tp))14409select_retry_pty(tp);MINIXSOURCECODEFile:drivers/tty/tty.
c68714410#endif14411}1441314414*in_transfer*1441514416PRIVATEvoidin_transfer(tp)14417registertty_t*tp;/*pointertoterminaltoreadfrom*/14418{14419/*Transferbytesfromtheinputqueuetoaprocessreadingfromaterminal.
*/1442014421intch;14422intcount;14423charbuf[64],*bp;1442414425/*Forcereadtosucceedifthelineishungup,lookslikeEOFtoreader.
*/14426if(tp->tty_termios.
c_ospeed==B0)tp->tty_min=0;1442714428/*Anythingtodo*/14429if(tp->tty_inleft==0||tp->tty_eotcttty_min)return;1443014431bp=buf;14432while(tp->tty_inleft>0&&tp->tty_eotct>0){14433ch=*tp->tty_intail;1443414435if(!
(ch&IN_EOF)){14436/*Onecharactertobedeliveredtotheuser.
*/14437*bp=ch&IN_CHAR;14438tp->tty_inleft--;14439if(++bp==bufend(buf)){14440/*Tempbufferfull,copytouserspace.
*/14441sys_vircopy(SELF,D,(vir_bytes)buf,14442tp->tty_inproc,D,tp->tty_in_vir,14443(vir_bytes)buflen(buf));14444tp->tty_in_vir+=buflen(buf);14445tp->tty_incum+=buflen(buf);14446bp=buf;14447}14448}1444914450/*Removethecharacterfromtheinputqueue.
*/14451if(++tp->tty_intail==bufend(tp->tty_inbuf))14452tp->tty_intail=tp->tty_inbuf;14453tp->tty_incount--;14454if(ch&IN_EOT){14455tp->tty_eotct--;14456/*Don'treadpastalinebreakincanonicalmode.
*/14457if(tp->tty_termios.
c_lflag&ICANON)tp->tty_inleft=0;14458}14459}1446014461if(bp>buf){14462/*Leftovercharactersinthebuffer.
*/14463count=bp-buf;14464sys_vircopy(SELF,D,(vir_bytes)buf,14465tp->tty_inproc,D,tp->tty_in_vir,(vir_bytes)count);14466tp->tty_in_vir+=count;14467tp->tty_incum+=count;14468}14469688File:drivers/tty/tty.
cMINIXSOURCECODE14470/*Usuallyreplytothereader,possiblyevenifincum==0(EOF).
*/14471if(tp->tty_inleft==0){14472if(tp->tty_inrepcode==REVIVE){14473notify(tp->tty_incaller);14474tp->tty_inrevived=1;14475}else{14476tty_reply(tp->tty_inrepcode,tp->tty_incaller,14477tp->tty_inproc,tp->tty_incum);14478tp->tty_inleft=tp->tty_incum=0;14479}14480}14481}1448314484*in_process*1448514486PUBLICintin_process(tp,buf,count)14487registertty_t*tp;/*terminalonwhichcharacterhasarrived*/14488char*buf;/*bufferwithinputcharacters*/14489intcount;/*numberofinputcharacters*/14490{14491/*Charactershavejustbeentypedin.
Process,save,andechothem.
Return14492*thenumberofcharactersprocessed.
14493*/1449414495intch,sig,ct;14496inttimeset=FALSE;14497staticunsignedcharcsize_mask[]={0x1F,0x3F,0x7F,0xFF};1449814499for(ct=0;cttty_termios.
c_iflag&ISTRIP)ch&=0x7F;1450514506/*Inputextensions*/14507if(tp->tty_termios.
c_lflag&IEXTEN){1450814509/*Previouscharacterwasacharacterescape*/14510if(tp->tty_escaped){14511tp->tty_escaped=NOT_ESCAPED;14512ch|=IN_ESC;/*protectcharacter*/14513}1451414515/*LNEXT(V)toescapethenextcharacter*/14516if(ch==tp->tty_termios.
c_cc[VLNEXT]){14517tp->tty_escaped=ESCAPED;14518rawecho(tp,'');14519rawecho(tp,'\b');14520continue;/*donotstoretheescape*/14521}1452214523/*REPRINT(R)toreprintechoedcharacters*/14524if(ch==tp->tty_termios.
c_cc[VREPRINT]){14525reprint(tp);14526continue;14527}14528}14529MINIXSOURCECODEFile:drivers/tty/tty.
c68914530/*_POSIX_VDISABLEisanormalcharactervalue,sobetterescapeit.
*/14531if(ch==_POSIX_VDISABLE)ch|=IN_ESC;1453214533/*MapCRtoLF,ignoreCR,ormapLFtoCR.
*/14534if(ch=='\r'){14535if(tp->tty_termios.
c_iflag&IGNCR)continue;14536if(tp->tty_termios.
c_iflag&ICRNL)ch='\n';14537}else14538if(ch=='\n'){14539if(tp->tty_termios.
c_iflag&INLCR)ch='\r';14540}1454114542/*Canonicalmode*/14543if(tp->tty_termios.
c_lflag&ICANON){1454414545/*Eraseprocessing(ruboutoflastcharacter).
*/14546if(ch==tp->tty_termios.
c_cc[VERASE]){14547(void)back_over(tp);14548if(!
(tp->tty_termios.
c_lflag&ECHOE)){14549(void)tty_echo(tp,ch);14550}14551continue;14552}1455314554/*Killprocessing(removecurrentline).
*/14555if(ch==tp->tty_termios.
c_cc[VKILL]){14556while(back_over(tp)){}14557if(!
(tp->tty_termios.
c_lflag&ECHOE)){14558(void)tty_echo(tp,ch);14559if(tp->tty_termios.
c_lflag&ECHOK)14560rawecho(tp,'\n');14561}14562continue;14563}1456414565/*EOF(D)meansend-of-file,aninvisible"linebreak".
*/14566if(ch==tp->tty_termios.
c_cc[VEOF])ch|=IN_EOT|IN_EOF;1456714568/*ThelinemaybereturnedtotheuserafteranLF.
*/14569if(ch=='\n')ch|=IN_EOT;1457014571/*SamethingwithEOL,whateveritmaybe.
*/14572if(ch==tp->tty_termios.
c_cc[VEOL])ch|=IN_EOT;14573}1457414575/*Start/stopinputcontrol*/14576if(tp->tty_termios.
c_iflag&IXON){1457714578/*OutputstopsonSTOP(S).
*/14579if(ch==tp->tty_termios.
c_cc[VSTOP]){14580tp->tty_inhibited=STOPPED;14581tp->tty_events=1;14582continue;14583}1458414585/*OutputrestartsonSTART(Q)oranycharacterifIXANY.
*/14586if(tp->tty_inhibited){14587if(ch==tp->tty_termios.
c_cc[VSTART]14588||(tp->tty_termios.
c_iflag&IXANY)){14589tp->tty_inhibited=RUNNING;690File:drivers/tty/tty.
cMINIXSOURCECODE14590tp->tty_events=1;14591if(ch==tp->tty_termios.
c_cc[VSTART])14592continue;14593}14594}14595}1459614597if(tp->tty_termios.
c_lflag&ISIG){14598/*CheckforINTR()andQUIT(\)characters.
*/14599if(ch==tp->tty_termios.
c_cc[VINTR]14600||ch==tp->tty_termios.
c_cc[VQUIT]){14601sig=SIGINT;14602if(ch==tp->tty_termios.
c_cc[VQUIT])sig=SIGQUIT;14603sigchar(tp,sig);14604(void)tty_echo(tp,ch);14605continue;14606}14607}1460814609/*Istherespaceintheinputbuffer*/14610if(tp->tty_incount==buflen(tp->tty_inbuf)){14611/*Nospace;discardincanonicalmode,keepinrawmode.
*/14612if(tp->tty_termios.
c_lflag&ICANON)continue;14613break;14614}1461514616if(!
(tp->tty_termios.
c_lflag&ICANON)){14617/*Inrawmodeallcharactersare"linebreaks".
*/14618ch|=IN_EOT;1461914620/*Startaninter-bytetimer*/14621if(!
timeset&&tp->tty_termios.
c_cc[VMIN]>014622&&tp->tty_termios.
c_cc[VTIME]>0){14623settimer(tp,TRUE);14624timeset=TRUE;14625}14626}1462714628/*Performtheintricatefunctionofechoing.
*/14629if(tp->tty_termios.
c_lflag&(ECHO|ECHONL))ch=tty_echo(tp,ch);1463014631/*Savethecharacterintheinputqueue.
*/14632*tp->tty_inhead++=ch;14633if(tp->tty_inhead==bufend(tp->tty_inbuf))14634tp->tty_inhead=tp->tty_inbuf;14635tp->tty_incount++;14636if(ch&IN_EOT)tp->tty_eotct++;1463714638/*Trytofinishinputifthequeuethreatenstooverflow.
*/14639if(tp->tty_incount==buflen(tp->tty_inbuf))in_transfer(tp);14640}14641returnct;14642}1464414645*echo*1464614647PRIVATEinttty_echo(tp,ch)14648registertty_t*tp;/*terminalonwhichtoecho*/14649registerintch;/*pointertocharactertoecho*/MINIXSOURCECODEFile:drivers/tty/tty.
c69114650{14651/*Echothecharacterifechoingison.
Somecontrolcharactersareechoed14652*withtheirnormaleffect,othercontrolcharactersareechoedas"X",14653*normalcharactersareechoednormally.
EOF(D)isechoed,butimmediately14654*backspacedover.
Returnthecharacterwiththeechoedlengthaddedtoits14655*attributes.
14656*/14657intlen,rp;1465814659ch&=IN_LEN;14660if(!
(tp->tty_termios.
c_lflag&ECHO)){14661if(ch==('\n'|IN_EOT)&&(tp->tty_termios.
c_lflag14662&(ICANON|ECHONL))==(ICANON|ECHONL))14663(*tp->tty_echo)(tp,'\n');14664return(ch);14665}1466614667/*"Reprint"tellsiftheechooutputhasbeenmessedupbyotheroutput.
*/14668rp=tp->tty_incount==0FALSE:tp->tty_reprint;1466914670if((ch&IN_CHAR)14671switch(ch&(IN_ESC|IN_EOF|IN_EOT|IN_CHAR)){14672case'\t':14673len=0;14674do{14675(*tp->tty_echo)(tp,'');14676len++;14677}while(lentty_position&TAB_MASK)!
=0);14678break;14679case'\r'|IN_EOT:14680case'\n'|IN_EOT:14681(*tp->tty_echo)(tp,ch&IN_CHAR);14682len=0;14683break;14684default:14685(*tp->tty_echo)(tp,'');14686(*tp->tty_echo)(tp,ch&IN_CHAR));14687len=2;14688}14689}else14690if((ch&IN_CHAR)=='\177'){14691/*ADELprintsas"".
*/14692(*tp->tty_echo)(tp,'');14693(*tp->tty_echo)(tp,'');14694len=2;14695}else{14696(*tp->tty_echo)(tp,ch&IN_CHAR);14697len=1;14698}14699if(ch&IN_EOF)while(len>0){(*tp->tty_echo)(tp,'\b');len--;}1470014701tp->tty_reprint=rp;14702return(ch|(lentty_reprint;14714if(tp->tty_termios.
c_lflag&ECHO)(*tp->tty_echo)(tp,ch);14715tp->tty_reprint=rp;14716}1471814719*back_over*1472014721PRIVATEintback_over(tp)14722registertty_t*tp;14723{14724/*Backspacetopreviouscharacteronscreenanderaseit.
*/14725u16_t*head;14726intlen;1472714728if(tp->tty_incount==0)return(0);/*queueempty*/14729head=tp->tty_inhead;14730if(head==tp->tty_inbuf)head=bufend(tp->tty_inbuf);14731if(*--head&IN_EOT)return(0);/*can'terase"linebreaks"*/14732if(tp->tty_reprint)reprint(tp);/*reprintifmessedup*/14733tp->tty_inhead=head;14734tp->tty_incount--;14735if(tp->tty_termios.
c_lflag&ECHOE){14736len=(*head&IN_LEN)>>IN_LSHIFT;14737while(len>0){14738rawecho(tp,'\b');14739rawecho(tp,'');14740rawecho(tp,'\b');14741len--;14742}14743}14744return(1);/*onecharactererased*/14745}1474714748*reprint*1474914750PRIVATEvoidreprint(tp)14751registertty_t*tp;/*pointertottystruct*/14752{14753/*Restorewhathasbeenechoedtoscreenbeforeiftheuserinputhasbeen14754*messedupbyoutput,orifREPRINT(R)istyped.
14755*/14756intcount;14757u16_t*head;1475814759tp->tty_reprint=FALSE;1476014761/*Findthelastlinebreakintheinput.
*/14762head=tp->tty_inhead;14763count=tp->tty_incount;14764while(count>0){14765if(head==tp->tty_inbuf)head=bufend(tp->tty_inbuf);14766if(head[-1]&IN_EOT)break;14767head--;14768count--;14769}MINIXSOURCECODEFile:drivers/tty/tty.
c69314770if(count==tp->tty_incount)return;/*noreasontoreprint*/1477114772/*ShowREPRINT(R)andmovetoanewline.
*/14773(void)tty_echo(tp,tp->tty_termios.
c_cc[VREPRINT]|IN_ESC);14774rawecho(tp,'\r');14775rawecho(tp,'\n');1477614777/*Reprintfromthelastbreakonwards.
*/14778do{14779if(head==bufend(tp->tty_inbuf))head=tp->tty_inbuf;14780*head=tty_echo(tp,*head);14781head++;14782count++;14783}while(counttty_incount);14784}1478614787*out_process*1478814789PUBLICvoidout_process(tp,bstart,bpos,bend,icount,ocount)14790tty_t*tp;14791char*bstart,*bpos,*bend;/*start/pos/endofcircularbuffer*/14792int*icount;/*#inputchars/inputcharsused*/14793int*ocount;/*maxoutputchars/outputcharsused*/14794{14795/*Performoutputprocessingonacircularbuffer.
*icountisthenumberof14796*bytestoprocess,andthenumberofbytesactuallyprocessedonreturn.
14797**ocountisthespaceavailableoninputandthespaceusedonoutput.
14798*(Naturally*icounttty_position;1480614807while(ict>0){14808switch(*bpos){14809case'\7':14810break;14811case'\b':14812pos--;14813break;14814case'\r':14815pos=0;14816break;14817case'\n':14818if((tp->tty_termios.
c_oflag&(OPOST|ONLCR))14819==(OPOST|ONLCR)){14820/*MapLFtoCR+LFifthereisspace.
Notethatthe14821*nextcharacterinthebufferisoverwritten,so14822*westopatthispoint.
14823*/14824if(oct>=2){14825*bpos='\r';14826if(++bpos==bend)bpos=bstart;14827*bpos='\n';14828pos=0;14829ict--;694File:drivers/tty/tty.
cMINIXSOURCECODE14830oct-=2;14831}14832gotoout_done;/*nospaceorbuffergotchanged*/14833}14834break;14835case'\t':14836/*Bestguessforthetablength.
*/14837tablen=TAB_SIZE-(pos&TAB_MASK);1483814839if((tp->tty_termios.
c_oflag&(OPOST|XTABS))14840==(OPOST|XTABS)){14841/*Tabsmustbeexpanded.
*/14842if(oct>=tablen){14843pos+=tablen;14844ict--;14845oct-=tablen;14846do{14847*bpos='';14848if(++bpos==bend)bpos=bstart;14849}while(--tablen!
=0);14850}14851gotoout_done;14852}14853/*Tabsareoutputdirectly.
*/14854pos+=tablen;14855break;14856default:14857/*Assumeanyothercharacterprintsasonecharacter.
*/14858pos++;14859}14860if(++bpos==bend)bpos=bstart;14861ict--;14862oct--;14863}14864out_done:14865tp->tty_position=pos&TAB_MASK;1486614867*icount-=ict;/*[io]ctarethenumberofcharsnotused*/14868*ocount-=oct;/**[io]countarethenumberofcharsthatareused*/14869}1487114872*dev_ioctl*1487314874PRIVATEvoiddev_ioctl(tp)14875tty_t*tp;14876{14877/*Theioctl'sTCSETSW,TCSETSFandTCDRAINwaitforoutputtofinishtomake14878*surethatanattributechangedoesn'taffecttheprocessingofcurrent14879*output.
Onceoutputfinishestheioctlisexecutedasindo_ioctl().
14880*/14881intresult;1488214883if(tp->tty_outleft>0)return;/*outputnotfinished*/1488414885if(tp->tty_ioreq!
=TCDRAIN){14886if(tp->tty_ioreq==TCSETSF)tty_icancel(tp);14887result=sys_vircopy(tp->tty_ioproc,D,tp->tty_iovir,14888SELF,D,(vir_bytes)&tp->tty_termios,14889(vir_bytes)sizeof(tp->tty_termios));MINIXSOURCECODEFile:drivers/tty/tty.
c69514890setattr(tp);14891}14892tp->tty_ioreq=0;14893tty_reply(REVIVE,tp->tty_iocaller,tp->tty_ioproc,result);14894}1489614897*setattr*1489814899PRIVATEvoidsetattr(tp)14900tty_t*tp;14901{14902/*Applythenewlineattributes(raw/canonical,linespeed,etc.
)*/14903u16_t*inp;14904intcount;1490514906if(!
(tp->tty_termios.
c_lflag&ICANON)){14907/*Rawmode;puta"linebreak"onallcharactersintheinputqueue.
14908*ItisundefinedwhathappenstotheinputqueuewhenICANONis14909*switchedoff,aprocessshoulduseTCSAFLUSHtoflushthequeue.
14910*KeepingthequeuetopreservetypeaheadistheRightThing,however14911*whenaprocessdoesuseTCSANOWtoswitchtorawmode.
14912*/14913count=tp->tty_eotct=tp->tty_incount;14914inp=tp->tty_intail;14915while(count>0){14916*inp|=IN_EOT;14917if(++inp==bufend(tp->tty_inbuf))inp=tp->tty_inbuf;14918--count;14919}14920}1492114922/*InspectMINandTIME.
*/14923settimer(tp,FALSE);14924if(tp->tty_termios.
c_lflag&ICANON){14925/*NoMIN&TIMEincanonicalmode.
*/14926tp->tty_min=1;14927}else{14928/*InrawmodeMINisthenumberofcharswanted,andTIMEhowlong14929*towaitforthem.
Withinterestingexceptionsifeitheriszero.
14930*/14931tp->tty_min=tp->tty_termios.
c_cc[VMIN];14932if(tp->tty_min==0&&tp->tty_termios.
c_cc[VTIME]>0)14933tp->tty_min=1;14934}1493514936if(!
(tp->tty_termios.
c_iflag&IXON)){14937/*Nostart/stopoutputcontrol,sodon'tleaveoutputinhibited.
*/14938tp->tty_inhibited=RUNNING;14939tp->tty_events=1;14940}1494114942/*Settingtheoutputspeedtozerohangsupthephone.
*/14943if(tp->tty_termios.
c_ospeed==B0)sigchar(tp,SIGHUP);1494414945/*Setnewlinespeed,charactersize,etcatthedevicelevel.
*/14946(*tp->tty_ioctl)(tp,0);14947}696File:drivers/tty/tty.
cMINIXSOURCECODE1494914950*tty_reply*1495114952PUBLICvoidtty_reply(code,replyee,proc_nr,status)14953intcode;/*TASK_REPLYorREVIVE*/14954intreplyee;/*destinationaddressforthereply*/14955intproc_nr;/*towhomshouldthereplygo*/14956intstatus;/*replycode*/14957{14958/*Sendareplytoaprocessthatwantedtoreadorwritedata.
*/14959messagetty_mess;1496014961tty_mess.
m_type=code;14962tty_mess.
REP_PROC_NR=proc_nr;14963tty_mess.
REP_STATUS=status;1496414965if((status=send(replyee,&tty_mess))!
=OK){14966panic("TTY","tty_replyfailed,status\n",status);14967}14968}1497014971*sigchar*1497214973PUBLICvoidsigchar(tp,sig)14974registertty_t*tp;14975intsig;/*SIGINT,SIGQUIT,SIGKILLorSIGHUP*/14976{14977/*ProcessaSIGINT,SIGQUITorSIGKILLcharfromthekeyboardorSIGHUPfrom14978*attyclose,"stty0",orarealRS-232hangup.
MMwillsendthesignalto14979*theprocessgroup(INT,QUIT),allprocesses(KILL),orthesessionleader14980*(HUP).
14981*/14982intstatus;1498314984if(tp->tty_pgrp!
=0)14985if(OK!
=(status=sys_kill(tp->tty_pgrp,sig)))14986panic("TTY","Error,calltosys_killfailed",status);1498714988if(!
(tp->tty_termios.
c_lflag&NOFLSH)){14989tp->tty_incount=tp->tty_eotct=0;/*killearlierinput*/14990tp->tty_intail=tp->tty_inhead;14991(*tp->tty_ocancel)(tp,0);/*killalloutput*/14992tp->tty_inhibited=RUNNING;14993tp->tty_events=1;14994}14995}1499714998*tty_icancel*1499915000PRIVATEvoidtty_icancel(tp)15001registertty_t*tp;15002{15003/*Discardallpendinginput,ttybufferordevice.
*/1500415005tp->tty_incount=tp->tty_eotct=0;15006tp->tty_intail=tp->tty_inhead;15007(*tp->tty_icancel)(tp,0);15008}MINIXSOURCECODEFile:drivers/tty/tty.
c6971501015011*tty_init*1501215013PRIVATEvoidtty_init()15014{15015/*Initializettystructureandcalldeviceinitializationroutines.
*/1501615017registertty_t*tp;15018ints;15019structsigactionsigact;1502015021/*Initializetheterminallines.
*/15022for(tp=FIRST_TTY,s=0;tptty_index=s;1502515026tmr_inittimer(&tp->tty_tmr);1502715028tp->tty_intail=tp->tty_inhead=tp->tty_inbuf;15029tp->tty_min=1;15030tp->tty_termios=termios_defaults;15031tp->tty_icancel=tp->tty_ocancel=tp->tty_ioctl=tp->tty_close=15032tty_devnop;15033if(tptty_minor=CONS_MINOR+s;15036}else15037if(tptty_minor=RS232_MINOR+s-NR_CONS;15040}else{15041pty_init(tp);15042tp->tty_minor=s-(NR_CONS+NR_RS_LINES)+TTYPX_MINOR;15043}15044}15045}1504715048*tty_timed_out*1504915050PRIVATEvoidtty_timed_out(timer_t*tp)15051{15052/*Thistimerhasexpired.
Settheeventsflag,toforceprocessing.
*/15053tty_t*tty_ptr;15054tty_ptr=&tty_table[tmr_arg(tp)->ta_int];15055tty_ptr->tty_min=0;/*forcereadtosucceed*/15056tty_ptr->tty_events=1;15057}1505915060*expire_timers*1506115062PRIVATEvoidexpire_timers(void)15063{15064/*Asynchronousalarmmessagewasreceived.
Checkifthereareanyexpired15065*timers.
Possiblysettheeventflagandrescheduleanotheralarm.
15066*/15067clock_tnow;/*currenttime*/15068ints;698File:drivers/tty/tty.
cMINIXSOURCECODE1506915070/*Getthecurrenttimetocomparethetimersagainst.
*/15071if((s=getuptime(&now))!
=OK)15072panic("TTY","Couldn'tgetuptimefromclock.
",s);1507315074/*Scanthequeueoftimersforexpiredtimers.
Thisdispatchthewatchdog15075*functionsofexpiredtimers.
Possiblyanewalarmcallmustbescheduled.
15076*/15077tmrs_exptimers(&tty_timers,now,NULL);15078if(tty_timers==NULL)tty_next_timeout=TMR_NEVER;15079else{/*setnewsyncalarm*/15080tty_next_timeout=tty_timers->tmr_exp_time;15081if((s=sys_setalarm(tty_next_timeout,1))!
=OK)15082panic("TTY","Couldn'tsetsynchronousalarm.
",s);15083}15084}1508615087*settimer*1508815089PRIVATEvoidsettimer(tty_ptr,enable)15090tty_t*tty_ptr;/*linetosetorunsetatimeron*/15091intenable;/*settimeriftrue,otherwiseunset*/15092{15093clock_tnow;/*currenttime*/15094clock_texp_time;15095ints;1509615097/*Getthecurrenttimetocalculatethetimeouttime.
*/15098if((s=getuptime(&now))!
=OK)15099panic("TTY","Couldn'tgetuptimefromclock.
",s);15100if(enable){15101exp_time=now+tty_ptr->tty_termios.
c_cc[VTIME]*(HZ/10);15102/*SetanewtimerforenablingtheTTYeventsflags.
*/15103tmrs_settimer(&tty_timers,&tty_ptr->tty_tmr,15104exp_time,tty_timed_out,NULL);15105}else{15106/*Removethetimerfromtheactiveandexpiredlists.
*/15107tmrs_clrtimer(&tty_timers,&tty_ptr->tty_tmr,NULL);15108}1510915110/*Nowcheckifanewalarmmustbescheduled.
Thishappenswhenthefront15111*ofthetimersqueuewasdisabledorreinsertedatanotherposition,or15112*whenanewtimerwasaddedtothefront.
15113*/15114if(tty_timers==NULL)tty_next_timeout=TMR_NEVER;15115elseif(tty_timers->tmr_exp_time!
=tty_next_timeout){15116tty_next_timeout=tty_timers->tmr_exp_time;15117if((s=sys_setalarm(tty_next_timeout,1))!
=OK)15118panic("TTY","Couldn'tsetsynchronousalarm.
",s);15119}15120}1512215123*tty_devnop*1512415125PUBLICinttty_devnop(tp,try)15126tty_t*tp;15127inttry;15128{MINIXSOURCECODEFile:drivers/tty/tty.
c69915129/*Somefunctionsneednotbeimplementedatthedevicelevel.
*/15130}1513215133*do_select*1513415135PRIVATEvoiddo_select(tp,m_ptr)15136registertty_t*tp;/*pointertottystruct*/15137registermessage*m_ptr;/*pointertomessagesenttothetask*/15138{15139intops,ready_ops=0,watch;1514015141ops=m_ptr->PROC_NR&(SEL_RD|SEL_WR|SEL_ERR);15142watch=(m_ptr->PROC_NR&SEL_NOTIFY)1:0;1514315144ready_ops=select_try(tp,ops);1514515146if(!
ready_ops&&ops&&watch){15147tp->tty_select_ops|=ops;15148tp->tty_select_proc=m_ptr->m_source;15149}1515015151tty_reply(TASK_REPLY,m_ptr->m_source,m_ptr->PROC_NR,ready_ops);1515215153return;15154}drivers/tty/keyboard.
c15200/*KeyboarddriverforPC'sandAT's.
15201*15202*Changes:15203*Jul13,2004processescanobservefunctionkeys(JorritN.
Herder)15204*Jun15,2004removedwreboot(),exceptpanicdumps(JorritN.
Herder)15205*Feb04,1994loadablekeymaps(MarcusHampel)15206*/1520715208#include".
.
/drivers.
h"15209#include15210#include15211#include15212#include15213#include15214#include15215#include15216#include15217#include"tty.
h"15218#include"keymaps/us-std.
src"15219#include".
.
/.
.
/kernel/const.
h"15220#include".
.
/.
.
/kernel/config.
h"15221#include".
.
/.
.
/kernel/type.
h"15222#include".
.
/.
.
/kernel/proc.
h"1522315224intirq_hook_id=-1;700File:drivers/tty/keyboard.
cMINIXSOURCECODE1522515226/*StandardandATkeyboard.
(PS/2MCAimpliesATthroughout.
)*/15227#defineKEYBD0x60/*I/Oportforkeyboarddata*/1522815229/*ATkeyboard.
*/15230#defineKB_COMMAND0x64/*I/OportforcommandsonAT*/15231#defineKB_STATUS0x64/*I/OportforstatusonAT*/15232#defineKB_ACK0xFA/*keyboardackresponse*/15233#defineKB_OUT_FULL0x01/*statusbitsetwhenkeypresscharpending*/15234#defineKB_IN_FULL0x02/*statusbitsetwhennotreadytoreceive*/15235#defineLED_CODE0xED/*commandtokeyboardtosetLEDs*/15236#defineMAX_KB_ACK_RETRIES0x1000/*max#timestowaitforkback*/15237#defineMAX_KB_BUSY_RETRIES0x1000/*max#timestoloopwhilekbbusy*/15238#defineKBIT0x80/*bitusedtoackcharacterstokeyboard*/1523915240/*Miscellaneous.
*/15241#defineESC_SCAN0x01/*rebootkeywhenpanicking*/15242#defineSLASH_SCAN0x35/*torecognizenumericslash*/15243#defineRSHIFT_SCAN0x36/*todistinguishleftandrightshift*/15244#defineHOME_SCAN0x47/*firstkeyonthenumerickeypad*/15245#defineINS_SCAN0x52/*INSforuseinCTRL-ALT-INSreboot*/15246#defineDEL_SCAN0x53/*DELforuseinCTRL-ALT-DELreboot*/1524715248#defineCONSOLE0/*linenumberforconsole*/15249#defineKB_IN_BYTES32/*sizeofkeyboardinputbuffer*/15250PRIVATEcharibuf[KB_IN_BYTES];/*inputbuffer*/15251PRIVATEchar*ihead=ibuf;/*nextfreespotininputbuffer*/15252PRIVATEchar*itail=ibuf;/*scancodetoreturntoTTY*/15253PRIVATEinticount;/*#codesinbuffer*/1525415255PRIVATEintesc;/*escapescancodedetected*/15256PRIVATEintalt_l;/*leftaltkeystate*/15257PRIVATEintalt_r;/*rightaltkeystate*/15258PRIVATEintalt;/*eitheraltkey*/15259PRIVATEintctrl_l;/*leftcontrolkeystate*/15260PRIVATEintctrl_r;/*rightcontrolkeystate*/15261PRIVATEintctrl;/*eithercontrolkey*/15262PRIVATEintshift_l;/*leftshiftkeystate*/15263PRIVATEintshift_r;/*rightshiftkeystate*/15264PRIVATEintshift;/*eithershiftkey*/15265PRIVATEintnum_down;/*numlockkeydepressed*/15266PRIVATEintcaps_down;/*capslockkeydepressed*/15267PRIVATEintscroll_down;/*scrolllockkeydepressed*/15268PRIVATEintlocks[NR_CONS];/*perconsolelockkeysstate*/1526915270/*Lockkeyactivebits.
ChosentobeequaltothekeyboardLEDbits.
*/15271#defineSCROLL_LOCK0x0115272#defineNUM_LOCK0x0215273#defineCAPS_LOCK0x041527415275PRIVATEcharnumpad_map[]=15276{'H','Y','A','B','D','C','V','U','G','S','T','@'};1527715278/*Variablesanddefinitionforobservedfunctionkeys.
*/15279typedefstructobserver{intproc_nr;intevents;}obs_t;15280PRIVATEobs_tfkey_obs[12];/*observersforF1-F12*/15281PRIVATEobs_tsfkey_obs[12];/*observersforSHIFTF1-F12*/1528215283FORWARD_PROTOTYPE(intkb_ack,(void));15284FORWARD_PROTOTYPE(intkb_wait,(void));MINIXSOURCECODEFile:drivers/tty/keyboard.
c70115285FORWARD_PROTOTYPE(intfunc_key,(intscode));15286FORWARD_PROTOTYPE(intscan_keyboard,(void));15287FORWARD_PROTOTYPE(unsignedmake_break,(intscode));15288FORWARD_PROTOTYPE(voidset_leds,(void));15289FORWARD_PROTOTYPE(voidshow_key_mappings,(void));15290FORWARD_PROTOTYPE(intkb_read,(structtty*tp,inttry));15291FORWARD_PROTOTYPE(unsignedmap_key,(intscode));152921529315294*map_key0*1529515296/*MapascancodetoanASCIIcodeignoringmodifiers.
*/15297#definemap_key0(scode)\15298((unsigned)keymap[(scode)*MAP_COLS])152991530015301*map_key*1530215303PRIVATEunsignedmap_key(scode)15304intscode;15305{15306/*MapascancodetoanASCIIcode.
*/1530715308intcaps,column,lk;15309u16_t*keyrow;1531015311if(scode==SLASH_SCAN&&esc)return'/';/*don'tmapnumericslash*/1531215313keyrow=&keymap[scode*MAP_COLS];1531415315caps=shift;15316lk=locks[ccurrent];15317if((lk&NUM_LOCK)&&HOME_SCANccurred.
Processit.
*/15339intscode;15340statictimer_ttimer;/*timermustbestatic!
*/1534115342/*Fetchthecharacterfromthekeyboardhardwareandacknowledgeit.
*/15343scode=scan_keyboard();15344702File:drivers/tty/keyboard.
cMINIXSOURCECODE15345/*Storethescancodeinmemorysothetaskcangetatitlater.
*/15346if(icountccurrent].
tty_events=1;15351if(tty_table[ccurrent].
tty_select_ops&SEL_RD){15352select_retry(&tty_table[ccurrent]);15353}15354}15355}1535715358*kb_read*1535915360PRIVATEintkb_read(tp,try)15361tty_t*tp;15362inttry;15363{15364/*Processcharactersfromthecircularkeyboardbuffer.
*/15365charbuf[3];15366intscode;15367unsignedch;1536815369tp=&tty_table[ccurrent];/*alwaysusethecurrentconsole*/1537015371if(try){15372if(icount>0)return1;15373return0;15374}1537515376while(icount>0){15377scode=*itail++;/*takeonekeyscancode*/15378if(itail==ibuf+KB_IN_BYTES)itail=ibuf;15379icount--;1538015381/*Functionkeysarebeingusedfordebugdumps.
*/15382if(func_key(scode))continue;1538315384/*Performmake/breakprocessing.
*/15385ch=make_break(scode);1538615387if(chccurrent-1);15402set_leds();15403}else15404if(ch==ARIGHT){MINIXSOURCECODEFile:drivers/tty/keyboard.
c70315405/*Choosehighernumberedconsoleascurrentconsole.
*/15406select_console(ccurrent+1);15407set_leds();15408}else15409if(AF1software*/15418caseCF7:sigchar(&tty_table[CONSOLE],SIGQUIT);break;15419caseCF8:sigchar(&tty_table[CONSOLE],SIGINT);break;15420caseCF9:sigchar(&tty_table[CONSOLE],SIGKILL);break;15421}15422}15423}1542415425return1;15426}1542815429*make_break*1543015431PRIVATEunsignedmake_break(scode)15432intscode;/*scancodeofkeyjuststruckorreleased*/15433{15434/*Thisroutinecanhandlekeyboardsthatinterruptonlyonkeydepression,15435*aswellaskeyboardsthatinterruptonkeydepressionandkeyrelease.
15436*Forefficiency,theinterruptroutinefiltersoutmostkeyreleases.
15437*/15438intch,make,escape;15439staticintCAD_count=0;1544015441/*CheckforCTRL-ALT-DEL,andiffound,haltthecomputer.
Thiswould15442*bebetterdoneinkeyboard()incaseTTYishung,exceptcontroland15443*altaresetinthehighlevelcode.
15444*/15445if(ctrl&&alt&&(scode==DEL_SCAN||scode==INS_SCAN))15446{15447if(++CAD_count==3)sys_abort(RBT_HALT);15448sys_kill(INIT_PROC_NR,SIGABRT);15449return-1;15450}1545115452/*High-orderbitsetonkeyrelease.
*/15453make=(scode&KEY_RELEASE)==0;/*trueifpressed*/1545415455ch=map_key(scode&=ASCII_MASK);/*maptoASCII*/1545615457escape=esc;/*Keyisescaped(trueifaddedsincetheXT)*/15458esc=0;1545915460switch(ch){15461caseCTRL:/*Leftorrightcontrolkey*/15462*(escape&ctrl_r:&ctrl_l)=make;15463ctrl=ctrl_l|ctrl_r;15464break;704File:drivers/tty/keyboard.
cMINIXSOURCECODE15465caseSHIFT:/*Leftorrightshiftkey*/15466*(scode==RSHIFT_SCAN&shift_r:&shift_l)=make;15467shift=shift_l|shift_r;15468break;15469caseALT:/*Leftorrightaltkey*/15470*(escape&alt_r:&alt_l)=make;15471alt=alt_l|alt_r;15472break;15473caseCALOCK:/*Capslock-toggleon0->1transition*/15474if(caps_downccurrent]=CAPS_LOCK;15476set_leds();15477}15478caps_down=make;15479break;15480caseNLOCK:/*Numlock*/15481if(num_downccurrent]=NUM_LOCK;15483set_leds();15484}15485num_down=make;15486break;15487caseSLOCK:/*Scrolllock*/15488if(scroll_downccurrent]=SCROLL_LOCK;15490set_leds();15491}15492scroll_down=make;15493break;15494caseEXTKEY:/*Escapekeycode*/15495esc=1;/*Nextkeyisescaped*/15496return(-1);15497default:/*Anormalkey*/15498if(make)return(ch);15499}1550015501/*Keyrelease,orashifttypekey.
*/15502return(-1);15503}1550515506*set_leds*1550715508PRIVATEvoidset_leds()15509{15510/*SettheLEDsonthecaps,num,andscrolllockkeys*/15511ints;15512if(!
machine.
pc_at)return;/*PC/XTdoesn'thaveLEDs*/1551315514kb_wait();/*waitforbufferempty*/15515if((s=sys_outb(KEYBD,LED_CODE))!
=OK)15516printf("Warning,sys_outbcouldn'tprepareforLEDvalues:%d\n",s);15517/*preparekeyboardtoacceptLEDvalues*/15518kb_ack();/*waitforackresponse*/1551915520kb_wait();/*waitforbufferempty*/15521if((s=sys_outb(KEYBD,locks[ccurrent]))!
=OK)15522printf("Warning,sys_outbcouldn'tgiveLEDvalues:%d\n",s);15523/*givekeyboardLEDvalues*/15524kb_ack();/*waitforackresponse*/MINIXSOURCECODEFile:drivers/tty/keyboard.
c70515525}1552715528*kb_wait*1552915530PRIVATEintkb_wait()15531{15532/*Waituntilthecontrollerisready;returnzeroifthistimesout.
*/1553315534intretries,status,temp;15535ints;1553615537retries=MAX_KB_BUSY_RETRIES+1;/*waituntilnotbusy*/15538do{15539s=sys_inb(KB_STATUS,&status);15540if(status&KB_OUT_FULL){15541s=sys_inb(KEYBD,&temp);/*discardvalue*/15542}15543if(!
(status&(KB_IN_FULL|KB_OUT_FULL)))15544break;/*waituntilready*/15545}while(--retries!
=0);/*continueunlesstimeout*/15546return(retries);/*zeroontimeout,positiveifready*/15547}1554915550*kb_ack*1555115552PRIVATEintkb_ack()15553{15554/*Waituntilkbdacknowledgeslastcommand;returnzeroifthistimesout.
*/1555515556intretries,s;15557u8_tu8val;1555815559retries=MAX_KB_ACK_RETRIES+1;15560do{15561s=sys_inb(KEYBD,&u8val);15562if(u8val==KB_ACK)15563break;/*waitforack*/15564}while(--retries!
=0);/*continueunlesstimeout*/1556515566return(retries);/*nonzeroifackreceived*/15567}1556915570*kb_init*1557115572PUBLICvoidkb_init(tp)15573tty_t*tp;15574{15575/*Initializethekeyboarddriver.
*/1557615577tp->tty_devread=kb_read;/*inputfunction*/15578}1558015581*kb_init_once*1558215583PUBLICvoidkb_init_once(void)15584{706File:drivers/tty/keyboard.
cMINIXSOURCECODE15585inti;1558615587set_leds();/*turnoffnumlockled*/15588scan_keyboard();/*discardleftoverkeystroke*/1558915590/*Clearthefunctionkeyobserversarray.
Alsoseefunc_key().
*/15591for(i=0;iPROC_NR,D,(vir_bytes)m->ADDRESS,15616SELF,D,(vir_bytes)keymap,15617(vir_bytes)sizeof(keymap));15618return(result);15619}1562115622*do_fkey_ctl*1562315624PUBLICvoiddo_fkey_ctl(m_ptr)15625message*m_ptr;/*pointertotherequestmessage*/15626{15627/*Thisprocedureallowsprocessestoregisterafunctionkeytoreceive15628*notificationsifitispressed.
Atmostonebindingperkeycanexist.
15629*/15630inti;15631intresult;1563215633switch(m_ptr->FKEY_REQUEST){/*seewhatwemustdo*/15634caseFKEY_MAP:/*requestfornewmapping*/15635result=OK;/*assumeeverythingwillbeok*/15636for(i=0;iFKEY_FKEYS,i+1)){15638if(fkey_obs[i].
proc_nr==NONE){15639fkey_obs[i].
proc_nr=m_ptr->m_source;15640fkey_obs[i].
events=0;15641bit_unset(m_ptr->FKEY_FKEYS,i+1);15642}else{15643printf("WARNING,fkey_mapfailedF%d\n",i+1);15644result=EBUSY;/*reportfailure,buttryrest*/MINIXSOURCECODEFile:drivers/tty/keyboard.
c70715645}15646}15647}15648for(i=0;iFKEY_SFKEYS,i+1)){15650if(sfkey_obs[i].
proc_nr==NONE){15651sfkey_obs[i].
proc_nr=m_ptr->m_source;15652sfkey_obs[i].
events=0;15653bit_unset(m_ptr->FKEY_SFKEYS,i+1);15654}else{15655printf("WARNING,fkey_mapfailedShiftF%d\n",i+1);15656result=EBUSY;/*reportfailurebuttryrest*/15657}15658}15659}15660break;15661caseFKEY_UNMAP:15662result=OK;/*assumeeverythingwillbeok*/15663for(i=0;iFKEY_FKEYS,i+1)){15665if(fkey_obs[i].
proc_nr==m_ptr->m_source){15666fkey_obs[i].
proc_nr=NONE;15667fkey_obs[i].
events=0;15668bit_unset(m_ptr->FKEY_FKEYS,i+1);15669}else{15670result=EPERM;/*reportfailure,buttryrest*/15671}15672}15673}15674for(i=0;iFKEY_SFKEYS,i+1)){15676if(sfkey_obs[i].
proc_nr==m_ptr->m_source){15677sfkey_obs[i].
proc_nr=NONE;15678sfkey_obs[i].
events=0;15679bit_unset(m_ptr->FKEY_SFKEYS,i+1);15680}else{15681result=EPERM;/*reportfailure,buttryrest*/15682}15683}15684}15685break;15686caseFKEY_EVENTS:15687m_ptr->FKEY_FKEYS=m_ptr->FKEY_SFKEYS=0;15688for(i=0;im_source){15690if(fkey_obs[i].
events){15691bit_set(m_ptr->FKEY_FKEYS,i+1);15692fkey_obs[i].
events=0;15693}15694}15695if(sfkey_obs[i].
proc_nr==m_ptr->m_source){15696if(sfkey_obs[i].
events){15697bit_set(m_ptr->FKEY_SFKEYS,i+1);15698sfkey_obs[i].
events=0;15699}15700}15701}15702break;15703default:15704result=EINVAL;/*keycannotbeobserved*/708File:drivers/tty/keyboard.
cMINIXSOURCECODE15705}1570615707/*Almostdone,returnresulttocaller.
*/15708m_ptr->m_type=result;15709send(m_ptr->m_source,m_ptr);15710}1571215713*func_key*1571415715PRIVATEintfunc_key(scode)15716intscode;/*scancodeforafunctionkey*/15717{15718/*Thisproceduretrapsfunctionkeysfordebuggingpurposes.
Observersof15719*functionkeysarekeptinaglobalarray.
Ifasubject(akey)ispressed15720*theobserverisnotifiedoftheevent.
Initializationofthearraysisdone15721*inkb_init,whereNONEissettoindicatethereisnointerestinthekey.
15722*ReturnsFALSEonakeyreleaseorifthekeyisnotobservable.
15723*/15724messagem;15725intkey;15726intproc_nr;15727inti,s;1572815729/*Ignorekeyreleases.
Ifthisisakeypress,getfullkeycode.
*/15730if(scode&KEY_RELEASE)return(FALSE);/*keyrelease*/15731key=map_key(scode);/*includemodifiers*/1573215733/*Keypressed,nowseeifthereisanobserverforthepressedkey.
15734*F1-F12observersareinfkey_obsarray.
15735*SHIFTF1-F12observersareinsfkey_reqarray.
15736*CTRLF1-F12reserved(seekb_read)15737*ALTF1-F12reserved(seekb_read)15738*Othercombinationsarenotinuse.
NotethatAlt+Shift+F1-F12isyet15739*definedin,andthusiseasyforfutureextensions.
15740*/15741if(F1");15780}1578115782printf("%sShift-F%d:",i+1");15789}15790printf("\n");15791}15792printf("\n");15793printf("Pressoneoftheregisteredfunctionkeystotriggeradebugdump.
\n");15794printf("\n");15795}1579715798*scan_keyboard*1579915800PRIVATEintscan_keyboard()15801{15802/*Fetchthecharacterfromthekeyboardhardwareandacknowledgeit.
*/15803pvb_pair_tbyte_in[2],byte_out[2];1580415805byte_in[0].
port=KEYBD;/*getthescancodeforthekeystruck*/15806byte_in[1].
port=PORT_B;/*strobethekeyboardtoackthechar*/15807sys_vinb(byte_in,2);/*requestactualinput*/1580815809pv_set(byte_out[0],PORT_B,byte_in[1].
value|KBIT);/*strobebithigh*/15810pv_set(byte_out[1],PORT_B,byte_in[1].
value);/*thenstrobelow*/15811sys_voutb(byte_out,2);/*requestactualoutput*/1581215813return(byte_in[0].
value);/*returnscancode*/15814}1581615817*do_panic_dumps*1581815819PUBLICvoiddo_panic_dumps(m)15820message*m;/*requestmessagetoTTY*/15821{15822/*Waitforkeystrokesforprintingdebugginginfoandreboot.
*/15823intquiet,code;15824710File:drivers/tty/keyboard.
cMINIXSOURCECODE15825/*Apanic!
Allowdebugdumpsuntiluserwantstoshutdown.
*/15826printf("\nHitESCtoreboot,DELtoshutdown,F-keysfordebugdumps\n");1582715828(void)scan_keyboard();/*ackanyoldinput*/15829quiet=scan_keyboard();/*quiescentvalue(0onPC,lastcodeonAT)*/15830for(;;){15831tickdelay(10);15832/*Seeiftherearependingrequestforoutput,butdon'tblock.
15833*Diagnosticscanspanmultipleprintf()s,sodoitinaloop.
15834*/15835while(nb_receive(ANY,m)==OK){15836switch(m->m_type){15837caseFKEY_CONTROL:do_fkey_ctl(m);break;15838caseSYS_SIG:do_new_kmess(m);break;15839caseDIAGNOSTICS:do_diagnostics(m);break;15840default:;/*donothing*/15841}15842tickdelay(1);/*allowmore*/15843}15844code=scan_keyboard();15845if(code!
=quiet){15846/*Akeyhasbeenpressed.
*/15847switch(code){/*possiblyabortMINIX*/15848caseESC_SCAN:sys_abort(RBT_REBOOT);return;15849caseDEL_SCAN:sys_abort(RBT_HALT);return;15850}15851(void)func_key(code);/*checkforfunctionkey*/15852quiet=scan_keyboard();15853}15854}15855}drivers/tty/console.
c15900/*CodeanddatafortheIBMconsoledriver.
15901*15902*The6845videocontrollerusedbytheIBMPCsharesitsvideomemorywith15903*theCPUsomewhereinthe0xB0000memorybank.
Tothe6845thismemory15904*consistsof16-bitwords.
Eachwordhasacharactercodeinthelowbyte15905*andaso-calledattributebyteinthehighbyte.
TheCPUdirectlymodifies15906*videomemorytodisplaycharacters,andsetstworegistersonthe6845that15907*specifythevideooriginandthecursorposition.
Thevideooriginisthe15908*placeinvideomemorywherethefirstcharacter(upperleftcorner)can15909*befound.
Movingtheoriginisafastwaytoscrollthescreen.
Some15910*videoadapterswraparoundthetopofvideomemory,sotheorigincan15911*movewithoutbounds.
Forotheradaptersscreenmemorymustsometimesbe15912*movedtoresettheorigin.
Allcomputationsonvideomemoryusecharacter15913*(word)addressesforsimplicityandassumethereisnowrapping.
The15914*assemblysupportfunctionstranslatethewordaddressestobyteaddresses15915*andthescrollingfunctionworriesaboutwrapping.
15916*/1591715918#include".
.
/drivers.
h"15919#includeMINIXSOURCECODEFile:drivers/tty/console.
c71115920#include15921#include15922#include"tty.
h"1592315924#include".
.
/.
.
/kernel/const.
h"15925#include".
.
/.
.
/kernel/config.
h"15926#include".
.
/.
.
/kernel/type.
h"1592715928/*Definitionsusedbytheconsoledriver.
*/15929#defineMONO_BASE0xB0000L/*baseofmonovideomemory*/15930#defineCOLOR_BASE0xB8000L/*baseofcolorvideomemory*/15931#defineMONO_SIZE0x1000/*4Kmonovideomemory*/15932#defineCOLOR_SIZE0x4000/*16Kcolorvideomemory*/15933#defineEGA_SIZE0x8000/*EGA&VGAhaveatleast32K*/15934#defineBLANK_COLOR0x0700/*determinescursorcoloronblankscreen*/15935#defineSCROLL_UP0/*scrollforward*/15936#defineSCROLL_DOWN1/*scrollbackward*/15937#defineBLANK_MEM((u16_t*)0)/*tellsmem_vid_copy()toblankthescreen*/15938#defineCONS_RAM_WORDS80/*videorambuffersize*/15939#defineMAX_ESC_PARMS4/*numberofescapesequenceparamsallowed*/1594015941/*Constantsrelatingtothecontrollerchips.
*/15942#defineM_68450x3B4/*portfor6845mono*/15943#defineC_68450x3D4/*portfor6845color*/15944#defineINDEX0/*6845'sindexregister*/15945#defineDATA1/*6845'sdataregister*/15946#defineSTATUS6/*6845'sstatusregister*/15947#defineVID_ORG12/*6845'soriginregister*/15948#defineCURSOR14/*6845'scursorregister*/1594915950/*Beeper.
*/15951#defineBEEP_FREQ0x0533/*valuetoputintotimertosetbeepfreq*/15952#defineB_TIME3/*lengthofCTRL-Gbeepisticks*/1595315954/*definitionsusedforfontmanagement*/15955#defineGA_SEQUENCER_INDEX0x3C415956#defineGA_SEQUENCER_DATA0x3C515957#defineGA_GRAPHICS_INDEX0x3CE15958#defineGA_GRAPHICS_DATA0x3CF15959#defineGA_VIDEO_ADDRESS0xA0000L15960#defineGA_FONT_SIZE81921596115962/*Globalvariablesusedbytheconsoledriverandassemblysupport.
*/15963PUBLICintvid_index;/*indexofvideosegmentinremotememmap*/15964PUBLICu16_tvid_seg;15965PUBLICvir_bytesvid_off;/*videoramisfoundatvid_seg:vid_off*/15966PUBLICunsignedvid_size;/*0x2000forcoloror0x0800formono*/15967PUBLICunsignedvid_mask;/*0x1FFFforcoloror0x07FFformono*/15968PUBLICunsignedblank_color=BLANK_COLOR;/*displaycodeforblank*/1596915970/*Privatevariablesusedbytheconsoledriver.
*/15971PRIVATEintvid_port;/*I/Oportforaccessing6845*/15972PRIVATEintwrap;/*hardwarecanwrap*/15973PRIVATEintsoftscroll;/*1=softwarescrolling,0=hardware*/15974PRIVATEintbeeping;/*speakerisbeeping*/15975PRIVATEunsignedfont_lines;/*fontlinespercharacter*/15976PRIVATEunsignedscr_width;/*#charactersonaline*/15977PRIVATEunsignedscr_lines;/*#linesonthescreen*/15978PRIVATEunsignedscr_size;/*#charactersonthescreen*/15979712File:drivers/tty/console.
cMINIXSOURCECODE15980/*Perconsoledata.
*/15981typedefstructconsole{15982tty_t*c_tty;/*associatedTTYstruct*/15983intc_column;/*currentcolumnnumber(0-origin)*/15984intc_row;/*currentrow(0attopofscreen)*/15985intc_rwords;/*numberofWORDS(notbytes)inoutqueue*/15986unsignedc_start;/*startofvideomemoryofthisconsole*/15987unsignedc_limit;/*limitofthisconsole'svideomemory*/15988unsignedc_org;/*locationinRAMwhere6845basepoints*/15989unsignedc_cur;/*currentpositionofcursorinvideoRAM*/15990unsignedc_attr;/*characterattribute*/15991unsignedc_blank;/*blankattribute*/15992charc_reverse;/*reversevideo*/15993charc_esc_state;/*0=normal,1=ESC,2=ESC[*/15994charc_esc_intro;/*DistinguishingcharacterfollowingESC*/15995int*c_esc_parmp;/*pointertocurrentescapeparameter*/15996intc_esc_parmv[MAX_ESC_PARMS];/*listofescapeparameters*/15997u16_tc_ramqueue[CONS_RAM_WORDS];/*bufferforvideoRAM*/15998}console_t;1599916000PRIVATEintnr_cons=1;/*actualnumberofconsoles*/16001PRIVATEconsole_tcons_table[NR_CONS];16002PRIVATEconsole_t*curcons;/*currentlyvisible*/1600316004/*Colorifusingacolorcontroller.
*/16005#definecolor(vid_port==C_6845)1600616007/*MapfromANSIcolorstotheattributesusedbythePC*/16008PRIVATEintansi_colors[8]={0,4,2,6,1,5,3,7};1600916010/*Structureusedforfontmanagement*/16011structsequence{16012unsignedshortindex;16013unsignedcharport;16014unsignedcharvalue;16015};1601616017FORWARD_PROTOTYPE(intcons_write,(structtty*tp,inttry));16018FORWARD_PROTOTYPE(voidcons_echo,(tty_t*tp,intc));16019FORWARD_PROTOTYPE(voidout_char,(console_t*cons,intc));16020FORWARD_PROTOTYPE(voidputk,(intc));16021FORWARD_PROTOTYPE(voidbeep,(void));16022FORWARD_PROTOTYPE(voiddo_escape,(console_t*cons,intc));16023FORWARD_PROTOTYPE(voidflush,(console_t*cons));16024FORWARD_PROTOTYPE(voidparse_escape,(console_t*cons,intc));16025FORWARD_PROTOTYPE(voidscroll_screen,(console_t*cons,intdir));16026FORWARD_PROTOTYPE(voidset_6845,(intreg,unsignedval));16027FORWARD_PROTOTYPE(voidget_6845,(intreg,unsigned*val));16028FORWARD_PROTOTYPE(voidstop_beep,(timer_t*tmrp));16029FORWARD_PROTOTYPE(voidcons_org0,(void));16030FORWARD_PROTOTYPE(intga_program,(structsequence*seq));16031FORWARD_PROTOTYPE(intcons_ioctl,(tty_t*tp,int));160321603316034*cons_write*1603516036PRIVATEintcons_write(tp,try)16037registerstructtty*tp;/*tellswhichterminalistobeused*/16038inttry;16039{MINIXSOURCECODEFile:drivers/tty/console.
c71316040/*Copyasmuchdataaspossibletotheoutputqueue,thenstartI/O.
On16041*memory-mappedterminals,suchastheIBMconsole,theI/Owillalsobe16042*finished,andthecountsupdated.
KeeprepeatinguntilallI/Odone.
16043*/1604416045intcount;16046intresult;16047registerchar*tbuf;16048charbuf[64];16049console_t*cons=tp->tty_priv;1605016051if(try)return1;/*wecanalwayswritetoconsole*/1605216053/*Checkquicklyfornothingtodo,sothiscanbecalledoftenwithout16054*unmodulartestselsewhere.
16055*/16056if((count=tp->tty_outleft)==0||tp->tty_inhibited)return;1605716058/*Copytheuserbytestobuf[]fordecentaddressing.
Loopoverthe16059*copies,sincetheuserbuffermaybemuchlargerthanbuf[].
16060*/16061do{16062if(count>sizeof(buf))count=sizeof(buf);16063if((result=sys_vircopy(tp->tty_outproc,D,tp->tty_out_vir,16064SELF,D,(vir_bytes)buf,(vir_bytes)count))!
=OK)16065break;16066tbuf=buf;1606716068/*Updateterminaldatastructure.
*/16069tp->tty_out_vir+=count;16070tp->tty_outcum+=count;16071tp->tty_outleft-=count;1607216073/*Outputeachbyteofthecopytothescreen.
Avoidcalling16074*out_char()forthe"easy"characters,putthemintothebuffer16075*directly.
16076*/16077do{16078if((unsigned)*tbufcons->c_esc_state>016079||cons->c_column>=scr_width16080||cons->c_rwords>=buflen(cons->c_ramqueue))16081{16082out_char(cons,*tbuf++);16083}else{16084cons->c_ramqueue[cons->c_rwords++]=16085cons->c_attr|(*tbuf++&BYTE);16086cons->c_column++;16087}16088}while(--count!
=0);16089}while((count=tp->tty_outleft)!
=0&&!
tp->tty_inhibited);1609016091flush(cons);/*transferanythingbufferedtothescreen*/1609216093/*Replytothewriterifalloutputisfinishedorifanerroroccured.
*/16094if(tp->tty_outleft==0||result!
=OK){16095/*REVIVEisnotpossible.
I/Oonmemorymappedconsolesfinishes.
*/16096tty_reply(tp->tty_outrepcode,tp->tty_outcaller,tp->tty_outproc,16097tp->tty_outcum);16098tp->tty_outcum=0;16099}714File:drivers/tty/console.
cMINIXSOURCECODE16100}1610216103*cons_echo*1610416105PRIVATEvoidcons_echo(tp,c)16106registertty_t*tp;/*pointertottystruct*/16107intc;/*charactertobeechoed*/16108{16109/*Echokeyboardinput(print&flush).
*/16110console_t*cons=tp->tty_priv;1611116112out_char(cons,c);16113flush(cons);16114}1611616117*out_char*1611816119PRIVATEvoidout_char(cons,c)16120registerconsole_t*cons;/*pointertoconsolestruct*/16121intc;/*charactertobeoutput*/16122{16123/*Outputacharacterontheconsole.
Checkforescapesequencesfirst.
*/16124if(cons->c_esc_state>0){16125parse_escape(cons,c);16126return;16127}1612816129switch(c){16130case000:/*nullistypicallyusedforpadding*/16131return;/*betternotdoanything*/1613216133case007:/*ringthebell*/16134flush(cons);/*printanycharsqueuedforoutput*/16135beep();16136return;1613716138case'\b':/*backspace*/16139if(--cons->c_columnc_row>=0)cons->c_column+=scr_width;16141}16142flush(cons);16143return;1614416145case'\n':/*linefeed*/16146if((cons->c_tty->tty_termios.
c_oflag&(OPOST|ONLCR))16147==(OPOST|ONLCR)){16148cons->c_column=0;16149}16150/*FALLTHROUGH*/16151case013:/*CTRL-K*/16152case014:/*CTRL-L*/16153if(cons->c_row==scr_lines-1){16154scroll_screen(cons,SCROLL_UP);16155}else{16156cons->c_row++;16157}16158flush(cons);16159return;MINIXSOURCECODEFile:drivers/tty/console.
c7151616016161case'\r':/*carriagereturn*/16162cons->c_column=0;16163flush(cons);16164return;1616516166case'\t':/*tab*/16167cons->c_column=(cons->c_column+TAB_SIZE)&TAB_MASK;16168if(cons->c_column>scr_width){16169cons->c_column-=scr_width;16170if(cons->c_row==scr_lines-1){16171scroll_screen(cons,SCROLL_UP);16172}else{16173cons->c_row++;16174}16175}16176flush(cons);16177return;1617816179case033:/*ESC-startofanescapesequence*/16180flush(cons);/*printanycharsqueuedforoutput*/16181cons->c_esc_state=1;/*markESCasseen*/16182return;1618316184default:/*printablecharsarestoredinramqueue*/16185if(cons->c_column>=scr_width){16186if(!
LINEWRAP)return;16187if(cons->c_row==scr_lines-1){16188scroll_screen(cons,SCROLL_UP);16189}else{16190cons->c_row++;16191}16192cons->c_column=0;16193flush(cons);16194}16195if(cons->c_rwords==buflen(cons->c_ramqueue))flush(cons);16196cons->c_ramqueue[cons->c_rwords++]=cons->c_attr|(c&BYTE);16197cons->c_column++;/*nextcolumn*/16198return;16199}16200}1620216203*scroll_screen*1620416205PRIVATEvoidscroll_screen(cons,dir)16206registerconsole_t*cons;/*pointertoconsolestruct*/16207intdir;/*SCROLL_UPorSCROLL_DOWN*/16208{16209unsignednew_line,new_org,chars;1621016211flush(cons);16212chars=scr_size-scr_width;/*onescreenminusoneline*/1621316214/*Scrollingthescreenisarealnuisanceduetothevariousincompatible16215*videocards.
Thisdriversupportssoftwarescrolling(Hercules),16216*hardwarescrolling(monoandCGAcards)andhardwarescrollingwithout16217*wrapping(EGAcards).
Inthelattercasewemustmakesurethat16218*c_startc_start+scr_width,cons->c_start,chars);16225}else16226if(!
wrap&&cons->c_org+scr_size+scr_width>=cons->c_limit){16227vid_vid_copy(cons->c_org+scr_width,cons->c_start,chars);16228cons->c_org=cons->c_start;16229}else{16230cons->c_org=(cons->c_org+scr_width)&vid_mask;16231}16232new_line=(cons->c_org+chars)&vid_mask;16233}else{16234/*Scrollonelinedownin3ways:soft,avoidwrap,useorigin.
*/16235if(softscroll){16236vid_vid_copy(cons->c_start,cons->c_start+scr_width,chars);16237}else16238if(!
wrap&&cons->c_orgc_start+scr_width){16239new_org=cons->c_limit-scr_size;16240vid_vid_copy(cons->c_org,new_org+scr_width,chars);16241cons->c_org=new_org;16242}else{16243cons->c_org=(cons->c_org-scr_width)&vid_mask;16244}16245new_line=cons->c_org;16246}16247/*Blankthenewlineattoporbottom.
*/16248blank_color=cons->c_blank;16249mem_vid_copy(BLANK_MEM,new_line,scr_width);1625016251/*Setthenewvideoorigin.
*/16252if(cons==curcons)set_6845(VID_ORG,cons->c_org);16253flush(cons);16254}1625616257*flush*1625816259PRIVATEvoidflush(cons)16260registerconsole_t*cons;/*pointertoconsolestruct*/16261{16262/*Sendcharactersbufferedin'ramqueue'toscreenmemory,checkthenew16263*cursorposition,computethenewhardwarecursorpositionandsetit.
16264*/16265unsignedcur;16266tty_t*tp=cons->c_tty;1626716268/*Havethecharactersin'ramqueue'transferredtothescreen.
*/16269if(cons->c_rwords>0){16270mem_vid_copy(cons->c_ramqueue,cons->c_cur,cons->c_rwords);16271cons->c_rwords=0;1627216273/*TTYlikestoknowthecurrentcolumnandifechoingmessedup.
*/16274tp->tty_position=cons->c_column;16275tp->tty_reprint=TRUE;16276}1627716278/*Checkandupdatethecursorposition.
*/16279if(cons->c_columnc_column=0;MINIXSOURCECODEFile:drivers/tty/console.
c71716280if(cons->c_column>scr_width)cons->c_column=scr_width;16281if(cons->c_rowc_row=0;16282if(cons->c_row>=scr_lines)cons->c_row=scr_lines-1;16283cur=cons->c_org+cons->c_row*scr_width+cons->c_column;16284if(cur!
=cons->c_cur){16285if(cons==curcons)set_6845(CURSOR,cur);16286cons->c_cur=cur;16287}16288}1629016291*parse_escape*1629216293PRIVATEvoidparse_escape(cons,c)16294registerconsole_t*cons;/*pointertoconsolestruct*/16295charc;/*nextcharacterinescapesequence*/16296{16297/*ThefollowingANSIescapesequencesarecurrentlysupported.
16298*Ifnand/ormareomitted,theydefaultto1.
16299*ESC[nAmovesupnlines16300*ESC[nBmovesdownnlines16301*ESC[nCmovesrightnspaces16302*ESC[nDmovesleftnspaces16303*ESC[m;nH"movescursorto(m,n)16304*ESC[Jclearsscreenfromcursor16305*ESC[Kclearslinefromcursor16306*ESC[nLinsertsnlinesarcursor16307*ESC[nMdeletesnlinesatcursor16308*ESC[nPdeletesncharsatcursor16309*ESC[n@insertsncharsatcursor16310*ESC[nmenablesrenditionn(0=normal,4=bold,5=blinking,7=reverse)16311*ESCMscrollsthescreenbackwardsifthecursorisonthetopline16312*/1631316314switch(cons->c_esc_state){16315case1:/*ESCseen*/16316cons->c_esc_intro='\0';16317cons->c_esc_parmp=bufend(cons->c_esc_parmv);16318do{16319*--cons->c_esc_parmp=0;16320}while(cons->c_esc_parmp>cons->c_esc_parmv);16321switch(c){16322case'[':/*ControlSequenceIntroducer*/16323cons->c_esc_intro=c;16324cons->c_esc_state=2;16325break;16326case'M':/*ReverseIndex*/16327do_escape(cons,c);16328break;16329default:16330cons->c_esc_state=0;16331}16332break;1633316334case2:/*ESC[seen*/16335if(c>='0'&&cc_esc_parmpc_esc_parmv))16337*cons->c_esc_parmp=*cons->c_esc_parmp*10+(c-'0');16338}else16339if(c718File:drivers/tty/console.
cMINIXSOURCECODE16340if(cons->c_esc_parmpc_esc_parmv))16341cons->c_esc_parmp++;16342}else{16343do_escape(cons,c);16344}16345break;16346}16347}1634916350*do_escape*1635116352PRIVATEvoiddo_escape(cons,c)16353registerconsole_t*cons;/*pointertoconsolestruct*/16354charc;/*nextcharacterinescapesequence*/16355{16356intvalue,n;16357unsignedsrc,dst,count;16358int*parmp;1635916360/*SomeofthesethingshackonscreenRAM,soithadbetterbeuptodate*/16361flush(cons);1636216363if(cons->c_esc_intro=='\0'){16364/*HandleasequencebeginningwithjustESC*/16365switch(c){16366case'M':/*ReverseIndex*/16367if(cons->c_row==0){16368scroll_screen(cons,SCROLL_DOWN);16369}else{16370cons->c_row--;16371}16372flush(cons);16373break;1637416375default:break;16376}16377}else16378if(cons->c_esc_intro16379/*HandleasequencebeginningwithESC[andparameters*/16380value=cons->c_esc_parmv[0];16381switch(c){16382case'A':/*ESC[nAmovesupnlines*/16383n=(value==01:value);16384cons->c_row-=n;16385flush(cons);16386break;1638716388case'B':/*ESC[nBmovesdownnlines*/16389n=(value==01:value);16390cons->c_row+=n;16391flush(cons);16392break;1639316394case'C':/*ESC[nCmovesrightnspaces*/16395n=(value==01:value);16396cons->c_column+=n;16397flush(cons);16398break;16399MINIXSOURCECODEFile:drivers/tty/console.
c71916400case'D':/*ESC[nDmovesleftnspaces*/16401n=(value==01:value);16402cons->c_column-=n;16403flush(cons);16404break;1640516406case'H':/*ESC[m;nH"movescursorto(m,n)*/16407cons->c_row=cons->c_esc_parmv[0]-1;16408cons->c_column=cons->c_esc_parmv[1]-1;16409flush(cons);16410break;1641116412case'J':/*ESC[sJclearsindisplay*/16413switch(value){16414case0:/*Clearfromcursortoendofscreen*/16415count=scr_size-(cons->c_cur-cons->c_org);16416dst=cons->c_cur;16417break;16418case1:/*Clearfromstartofscreentocursor*/16419count=cons->c_cur-cons->c_org;16420dst=cons->c_org;16421break;16422case2:/*Clearentirescreen*/16423count=scr_size;16424dst=cons->c_org;16425break;16426default:/*Donothing*/16427count=0;16428dst=cons->c_org;16429}16430blank_color=cons->c_blank;16431mem_vid_copy(BLANK_MEM,dst,count);16432break;1643316434case'K':/*ESC[sKclearslinefromcursor*/16435switch(value){16436case0:/*Clearfromcursortoendofline*/16437count=scr_width-cons->c_column;16438dst=cons->c_cur;16439break;16440case1:/*Clearfrombeginningoflinetocursor*/16441count=cons->c_column;16442dst=cons->c_cur-cons->c_column;16443break;16444case2:/*Clearentireline*/16445count=scr_width;16446dst=cons->c_cur-cons->c_column;16447break;16448default:/*Donothing*/16449count=0;16450dst=cons->c_cur;16451}16452blank_color=cons->c_blank;16453mem_vid_copy(BLANK_MEM,dst,count);16454break;1645516456case'L':/*ESC[nLinsertsnlinesatcursor*/16457n=value;16458if(n(scr_lines-cons->c_row))720File:drivers/tty/console.
cMINIXSOURCECODE16460n=scr_lines-cons->c_row;1646116462src=cons->c_org+cons->c_row*scr_width;16463dst=src+n*scr_width;16464count=(scr_lines-cons->c_row-n)*scr_width;16465vid_vid_copy(src,dst,count);16466blank_color=cons->c_blank;16467mem_vid_copy(BLANK_MEM,src,n*scr_width);16468break;1646916470case'M':/*ESC[nMdeletesnlinesatcursor*/16471n=value;16472if(n(scr_lines-cons->c_row))16474n=scr_lines-cons->c_row;1647516476dst=cons->c_org+cons->c_row*scr_width;16477src=dst+n*scr_width;16478count=(scr_lines-cons->c_row-n)*scr_width;16479vid_vid_copy(src,dst,count);16480blank_color=cons->c_blank;16481mem_vid_copy(BLANK_MEM,dst+count,n*scr_width);16482break;1648316484case'@':/*ESC[n@insertsncharsatcursor*/16485n=value;16486if(n(scr_width-cons->c_column))16488n=scr_width-cons->c_column;1648916490src=cons->c_cur;16491dst=src+n;16492count=scr_width-cons->c_column-n;16493vid_vid_copy(src,dst,count);16494blank_color=cons->c_blank;16495mem_vid_copy(BLANK_MEM,src,n);16496break;1649716498case'P':/*ESC[nPdeletesncharsatcursor*/16499n=value;16500if(n(scr_width-cons->c_column))16502n=scr_width-cons->c_column;1650316504dst=cons->c_cur;16505src=dst+n;16506count=scr_width-cons->c_column-n;16507vid_vid_copy(src,dst,count);16508blank_color=cons->c_blank;16509mem_vid_copy(BLANK_MEM,dst+count,n);16510break;1651116512case'm':/*ESC[nmenablesrenditionn*/16513for(parmp=cons->c_esc_parmv;parmpc_esc_parmp16514&&parmpc_esc_parmv);parmp++){16515if(cons->c_reverse){16516/*Unswapfgandbgcolors*/16517cons->c_attr=((cons->c_attr&0x7000)>>4)|16518((cons->c_attr&0x0700)c_attr&0x8800));MINIXSOURCECODEFile:drivers/tty/console.
c72116520}16521switch(n=*parmp){16522case0:/*NORMAL*/16523cons->c_attr=cons->c_blank=BLANK_COLOR;16524cons->c_reverse=FALSE;16525break;1652616527case1:/*BOLD*/16528/*Setintensitybit*/16529cons->c_attr|=0x0800;16530break;1653116532case4:/*UNDERLINE*/16533if(color){16534/*Changewhitetocyan,i.
e.
losered16535*/16536cons->c_attr=(cons->c_attr&0xBBFF);16537}else{16538/*Setunderlineattribute*/16539cons->c_attr=(cons->c_attr&0x99FF);16540}16541break;1654216543case5:/*BLINKING*/16544/*Settheblinkbit*/16545cons->c_attr|=0x8000;16546break;1654716548case7:/*REVERSE*/16549cons->c_reverse=TRUE;16550break;1655116552default:/*COLOR*/16553if(n==39)n=37;/*setdefaultcolor*/16554if(n==49)n=40;1655516556if(!
color){16557/*Don'tmessupamonochromescreen*/16558}else16559if(30c_attr=16562(cons->c_attr&0xF8FF)|16563(ansi_colors[(n-30)]c_blank=16565(cons->c_blank&0xF8FF)|16566(ansi_colors[(n-30)]c_attr=16571(cons->c_attr&0x8FFF)|16572(ansi_colors[(n-40)]c_blank=16574(cons->c_blank&0x8FFF)|16575(ansi_colors[(n-40)]c_reverse){16579/*Swapfgandbgcolors*/722File:drivers/tty/console.
cMINIXSOURCECODE16580cons->c_attr=((cons->c_attr&0x7000)>>4)|16581((cons->c_attr&0x0700)c_attr&0x8800));16583}16584}16585break;16586}16587}16588cons->c_esc_state=0;16589}1659116592*set_6845*1659316594PRIVATEvoidset_6845(reg,val)16595intreg;/*whichregisterpairtoset*/16596unsignedval;/*16-bitvaluetosetitto*/16597{16598/*Setaregisterpairinsidethe6845.
16599*Registers12-13tellthe6845whereinvideoramtostart16600*Registers14-15tellthe6845wheretoputthecursor16601*/16602pvb_pair_tchar_out[4];16603pv_set(char_out[0],vid_port+INDEX,reg);/*setindexregister*/16604pv_set(char_out[1],vid_port+DATA,(val>>8)&BYTE);/*highbyte*/16605pv_set(char_out[2],vid_port+INDEX,reg+1);/*again*/16606pv_set(char_out[3],vid_port+DATA,val&BYTE);/*lowbyte*/16607sys_voutb(char_out,4);/*doactualoutput*/16608}1661016611*get_6845*1661216613PRIVATEvoidget_6845(reg,val)16614intreg;/*whichregisterpairtoset*/16615unsigned*val;/*16-bitvaluetosetitto*/16616{16617charv1,v2;16618/*Getaregisterpairinsidethe6845.
*/16619sys_outb(vid_port+INDEX,reg);16620sys_inb(vid_port+DATA,&v1);16621sys_outb(vid_port+INDEX,reg+1);16622sys_inb(vid_port+DATA,&v2);16623*val=(v1>0)&BYTE);16647pv_set(char_out[2],TIMER2,(BEEP_FREQ>>8)&BYTE);16648if(sys_voutb(char_out,3)==OK){16649if(sys_inb(PORT_B,&port_b_val)==OK&&16650sys_outb(PORT_B,(port_b_val|3))==OK)16651beeping=TRUE;16652}16653}16654/*Addatimertothetimerslist.
Possiblyreschedulethealarm.
*/16655tmrs_settimer(&tty_timers,&tmr_stop_beep,now+B_TIME,stop_beep,NULL);16656if(tty_timers->tmr_exp_time!
=tty_next_timeout){16657tty_next_timeout=tty_timers->tmr_exp_time;16658if((s=sys_setalarm(tty_next_timeout,1))!
=OK)16659panic("TTY","Consolecouldn'tsetalarm.
",s);16660}16661}1666316664*stop_beep*1666516666PRIVATEvoidstop_beep(tmrp)16667timer_t*tmrp;16668{16669/*Turnoffthebeeperbyturningoffbits0and1inPORT_B.
*/16670intport_b_val;16671if(sys_inb(PORT_B,&port_b_val)==OK&&16672sys_outb(PORT_B,(port_b_val&3))==OK)16673beeping=FALSE;16674}1667616677*scr_init*1667816679PUBLICvoidscr_init(tp)16680tty_t*tp;16681{16682/*Initializethescreendriver.
*/16683console_t*cons;16684phys_bytesvid_base;16685u16_tbios_columns,bios_crtbase,bios_fontlines;16686u8_tbios_rows;16687intline;16688ints;16689staticintvdu_initialized=0;16690unsignedpage_size;1669116692/*AssociateconsoleandTTY.
*/16693line=tp-&tty_table[0];16694if(line>=nr_cons)return;16695cons=&cons_table[line];16696cons->c_tty=tp;16697tp->tty_priv=cons;1669816699/*Initializethekeyboarddriver.
*/724File:drivers/tty/console.
cMINIXSOURCECODE16700kb_init(tp);1670116702/*FillinTTYfunctionhooks.
*/16703tp->tty_devwrite=cons_write;16704tp->tty_echo=cons_echo;16705tp->tty_ioctl=cons_ioctl;1670616707/*GettheBIOSparametersthatdescribetheVDU.
*/16708if(!
vdu_initialized++){1670916710/*HowabouterrorcheckingWhattodoonfailure*/16711s=sys_vircopy(SELF,BIOS_SEG,(vir_bytes)VDU_SCREEN_COLS_ADDR,16712SELF,D,(vir_bytes)&bios_columns,VDU_SCREEN_COLS_SIZE);16713s=sys_vircopy(SELF,BIOS_SEG,(vir_bytes)VDU_CRT_BASE_ADDR,16714SELF,D,(vir_bytes)&bios_crtbase,VDU_CRT_BASE_SIZE);16715s=sys_vircopy(SELF,BIOS_SEG,(vir_bytes)VDU_SCREEN_ROWS_ADDR,16716SELF,D,(vir_bytes)&bios_rows,VDU_SCREEN_ROWS_SIZE);16717s=sys_vircopy(SELF,BIOS_SEG,(vir_bytes)VDU_FONTLINES_ADDR,16718SELF,D,(vir_bytes)&bios_fontlines,VDU_FONTLINES_SIZE);1671916720vid_port=bios_crtbase;16721scr_width=bios_columns;16722font_lines=bios_fontlines;16723scr_lines=machine.
vdu_egabios_rows+1:25;1672416725if(color){16726vid_base=COLOR_BASE;16727vid_size=COLOR_SIZE;16728}else{16729vid_base=MONO_BASE;16730vid_size=MONO_SIZE;16731}16732if(machine.
vdu_ega)vid_size=EGA_SIZE;16733wrap=!
machine.
vdu_ega;1673416735s=sys_segctl(&vid_index,&vid_seg,&vid_off,vid_base,vid_size);1673616737vid_size>>=1;/*wordcount*/16738vid_mask=vid_size-1;1673916740/*Sizeofthescreen(numberofdisplayedcharacters.
)*/16741scr_size=scr_lines*scr_width;1674216743/*Therecanbeasmanyconsolesasvideomemoryallows.
*/16744nr_cons=vid_size/scr_size;16745if(nr_cons>NR_CONS)nr_cons=NR_CONS;16746if(nr_cons>1)wrap=0;16747page_size=vid_size/nr_cons;16748}1674916750cons->c_start=line*page_size;16751cons->c_limit=cons->c_start+page_size;16752cons->c_cur=cons->c_org=cons->c_start;16753cons->c_attr=cons->c_blank=BLANK_COLOR;1675416755if(line!
=0){16756/*Clearthenon-consolevtys.
*/16757blank_color=BLANK_COLOR;16758mem_vid_copy(BLANK_MEM,cons->c_start,scr_size);16759}else{MINIXSOURCECODEFile:drivers/tty/console.
c72516760inti,n;16761/*Setthecursoroftheconsolevtyatthebottom.
c_cur16762*isupdatedautomaticallylater.
16763*/16764scroll_screen(cons,SCROLL_UP);16765cons->c_row=scr_lines-1;16766cons->c_column=0;16767}16768select_console(0);16769cons_ioctl(tp,0);16770}1677216773*kputc*1677416775PUBLICvoidkputc(c)16776intc;16777{16778putk(c);16779}1678116782*do_new_kmess*1678316784PUBLICvoiddo_new_kmess(m)16785message*m;16786{16787/*Notificationforanewkernelmessage.
*/16788structkmessageskmess;/*kmessagesstructure*/16789staticintprev_next=0;/*previousnextseen*/16790intsize,next;16791intbytes;16792intr;1679316794/*Trytogetafreshcopyofthebufferwithkernelmessages.
*/16795sys_getkmessages(&kmess);1679616797/*Printonlythenewpart.
Determinehowmanynewbytestherearewith16798*helpofthecurrentandprevious'next'index.
Notethatthekernel16799*bufferiscircular.
ThisworksfineiflessthenKMESS_BUF_SIZEbytes16800*isnewdata;elsewemiss%KMESS_BUF_SIZEhere.
16801*Checkforsizebeingpositive,thebuffermightaswellbeemptied!
16802*/16803if(kmess.
km_size>0){16804bytes=((kmess.
km_next+KMESS_BUF_SIZE)-prev_next)%KMESS_BUF_SIZE;16805r=prev_next;/*startatpreviousold*/16806while(bytes>0){16807putk(kmess.
km_buf[(r%KMESS_BUF_SIZE)]);16808bytes--;16809r++;16810}16811putk(0);/*terminatetoflushoutput*/16812}1681316814/*Almostdone,store'next'sothatwecandeterminewhatpartofthe16815*kernelmessagesbuffertoprintnexttimeanotificationarrives.
16816*/16817prev_next=kmess.
km_next;16818}726File:drivers/tty/console.
cMINIXSOURCECODE1682016821*do_diagnostics*1682216823PUBLICvoiddo_diagnostics(m_ptr)16824message*m_ptr;/*pointertorequestmessage*/16825{16826/*Printastringforaserver.
*/16827charc;16828vir_bytessrc;16829intcount;16830intresult=OK;16831intproc_nr=m_ptr->DIAG_PROC_NR;16832if(proc_nr==SELF)proc_nr=m_ptr->m_source;1683316834src=(vir_bytes)m_ptr->DIAG_PRINT_BUF;16835for(count=m_ptr->DIAG_BUF_COUNT;count>0;count--){16836if(sys_vircopy(proc_nr,D,src++,SELF,D,(vir_bytes)&c,1)!
=OK){16837result=EFAULT;16838break;16839}16840putk(c);16841}16842putk(0);/*alwaysterminate,evenwithEFAULT*/16843m_ptr->m_type=result;16844send(m_ptr->m_source,m_ptr);16845}1684716848*putk*1684916850PRIVATEvoidputk(c)16851intc;/*charactertoprint*/16852{16853/*Thisprocedureisusedbytheversionofprintf()thatislinkedwith16854*theTTYdriver.
TheoneinthelibrarysendsamessagetoFS,whichis16855*notwhatisneededforprintingwithintheTTY.
Thisversionjustqueues16856*thecharacterandstartstheoutput.
16857*/16858if(c!
=0){16859if(c=='\n')putk('\r');16860out_char(&cons_table[0],(int)c);16861}else{16862flush(&cons_table[0]);16863}16864}1686616867*toggle_scroll*1686816869PUBLICvoidtoggle_scroll()16870{16871/*Togglebetweenhardwareandsoftwarescroll.
*/1687216873cons_org0();16874softscroll=!
softscroll;16875printf("%swarescrollingenabled.
\n",softscroll"Soft":"Hard");16876}MINIXSOURCECODEFile:drivers/tty/console.
c7271687816879*cons_stop*1688016881PUBLICvoidcons_stop()16882{16883/*Prepareforhaltorreboot.
*/16884cons_org0();16885softscroll=1;16886select_console(0);16887cons_table[0].
c_attr=cons_table[0].
c_blank=BLANK_COLOR;16888}1689016891*cons_org0*1689216893PRIVATEvoidcons_org0()16894{16895/*Scrollvideomemorybacktoputtheoriginat0.
*/16896intcons_line;16897console_t*cons;16898unsignedn;1689916900for(cons_line=0;cons_linec_org>cons->c_start){16903n=vid_size-scr_size;/*amountofunusedmemory*/16904if(n>cons->c_org-cons->c_start)16905n=cons->c_org-cons->c_start;16906vid_vid_copy(cons->c_org,cons->c_org-n,scr_size);16907cons->c_org-=n;16908}16909flush(cons);16910}16911select_console(ccurrent);16912}1691416915*select_console*1691616917PUBLICvoidselect_console(intcons_line)16918{16919/*Setthecurrentconsoletoconsolenumber'cons_line'.
*/1692016921if(cons_line=nr_cons)return;16922ccurrent=cons_line;16923curcons=&cons_table[cons_line];16924set_6845(VID_ORG,curcons->c_org);16925set_6845(CURSOR,curcons->c_cur);16926}1692816929*con_loadfont*1693016931PUBLICintcon_loadfont(m)16932message*m;16933{16934/*LoadafontintotheEGAorVGAadapter.
*/16935intresult;16936staticstructsequenceseq1[7]={16937{GA_SEQUENCER_INDEX,0x00,0x01},728File:drivers/tty/console.
cMINIXSOURCECODE16938{GA_SEQUENCER_INDEX,0x02,0x04},16939{GA_SEQUENCER_INDEX,0x04,0x07},16940{GA_SEQUENCER_INDEX,0x00,0x03},16941{GA_GRAPHICS_INDEX,0x04,0x02},16942{GA_GRAPHICS_INDEX,0x05,0x00},16943{GA_GRAPHICS_INDEX,0x06,0x00},16944};16945staticstructsequenceseq2[7]={16946{GA_SEQUENCER_INDEX,0x00,0x01},16947{GA_SEQUENCER_INDEX,0x02,0x03},16948{GA_SEQUENCER_INDEX,0x04,0x03},16949{GA_SEQUENCER_INDEX,0x00,0x03},16950{GA_GRAPHICS_INDEX,0x04,0x00},16951{GA_GRAPHICS_INDEX,0x05,0x10},16952{GA_GRAPHICS_INDEX,0x06,0},16953};1695416955seq2[6].
value=color0x0E:0x0A;1695616957if(!
machine.
vdu_ega)return(ENOTTY);16958result=ga_program(seq1);/*bringfontmemoryintoview*/1695916960result=sys_physcopy(m->PROC_NR,D,(vir_bytes)m->ADDRESS,16961NONE,PHYS_SEG,(phys_bytes)GA_VIDEO_ADDRESS,(phys_bytes)GA_FONT_SIZE);1696216963result=ga_program(seq2);/*restore*/1696416965return(result);16966}1696816969*ga_program*1697016971PRIVATEintga_program(seq)16972structsequence*seq;16973{16974pvb_pair_tchar_out[14];16975inti;16976for(i=0;iindex,seq->port);16978pv_set(char_out[2*i+1],seq->index+1,seq->value);16979seq++;16980}16981returnsys_voutb(char_out,14);16982}1698416985*cons_ioctl*1698616987PRIVATEintcons_ioctl(tp,try)16988tty_t*tp;16989inttry;16990{16991/*Setthescreendimensions.
*/1699216993tp->tty_winsize.
ws_row=scr_lines;16994tp->tty_winsize.
ws_col=scr_width;16995tp->tty_winsize.
ws_xpixel=scr_width*8;16996tp->tty_winsize.
ws_ypixel=scr_lines*font_lines;16997}MINIXSOURCECODEFile:servers/pm/pm.
h729servers/pm/pm.
h17000/*ThisisthemasterheaderforPM.
Itincludessomeotherfiles17001*anddefinestheprincipalconstants.
17002*/17003#define_POSIX_SOURCE1/*tellheaderstoincludePOSIXstuff*/17004#define_MINIX1/*tellheaderstoincludeMINIXstuff*/17005#define_SYSTEM1/*tellheadersthatthisisthekernel*/1700617007/*Thefollowingaresobasic,allthe*.
cfilesgetthemautomatically.
*/17008#include/*MUSTbefirst*/17009#include/*MUSTbesecond*/17010#include17011#include17012#include1701317014#include17015#include17016#include17017#include1701817019#include17020#include1702117022#include"const.
h"17023#include"type.
h"17024#include"proto.
h"17025#include"glo.
h"servers/pm/const.
h17100/*ConstantsusedbytheProcessManager.
*/1710117102#defineNO_MEM((phys_clicks)0)/*returnedbyalloc_mem()withmemisup*/1710317104#defineNR_PIDS30000/*processidsrangefrom0toNR_PIDS-1.
17105*(magicconstant:someoldapplicationsuse17106*a'short'insteadofpid_t.
)17107*/1710817109#definePM_PID0/*PM'sprocessidnumber*/17110#defineINIT_PID1/*INIT'sprocessidnumber*/17111730File:servers/pm/type.
hMINIXSOURCECODEservers/pm/type.
h17200/*IftherewereanytypedefinitionslocaltotheProcessManager,theywould17201*behere.
ThisfileisincludedonlyforsymmetrywiththekernelandFile17202*System,whichdohavesomelocaltypedefinitions.
17203*/17204servers/pm/proto.
h17300/*Functionprototypes.
*/1730117302structmproc;17303structstat;17304structmem_map;17305structmemory;1730617307#include1730817309/*alloc.
c*/17310_PROTOTYPE(phys_clicksalloc_mem,(phys_clicksclicks));17311_PROTOTYPE(voidfree_mem,(phys_clicksbase,phys_clicksclicks));17312_PROTOTYPE(voidmem_init,(structmemory*chunks,phys_clicks*free));17313#defineswap_in()((void)0)17314#defineswap_inqueue(rmp)((void)0)1731517316/*break.
c*/17317_PROTOTYPE(intadjust,(structmproc*rmp,17318vir_clicksdata_clicks,vir_bytessp));17319_PROTOTYPE(intdo_brk,(void));17320_PROTOTYPE(intsize_ok,(intfile_type,vir_clickstc,vir_clicksdc,17321vir_clickssc,vir_clicksdvir,vir_clickss_vir));1732217323/*devio.
c*/17324_PROTOTYPE(intdo_dev_io,(void));17325_PROTOTYPE(intdo_dev_io,(void));1732617327/*dmp.
c*/17328_PROTOTYPE(intdo_fkey_pressed,(void));1732917330/*exec.
c*/17331_PROTOTYPE(intdo_exec,(void));17332_PROTOTYPE(voidrw_seg,(intrw,intfd,intproc,intseg,17333phys_bytesseg_bytes));17334_PROTOTYPE(structmproc*find_share,(structmproc*mp_ign,Ino_tino,17335Dev_tdev,time_tctime));1733617337/*forkexit.
c*/17338_PROTOTYPE(intdo_fork,(void));17339_PROTOTYPE(intdo_pm_exit,(void));17340_PROTOTYPE(intdo_waitpid,(void));17341_PROTOTYPE(voidpm_exit,(structmproc*rmp,intexit_status));1734217343/*getset.
c*/17344_PROTOTYPE(intdo_getset,(void));MINIXSOURCECODEFile:servers/pm/proto.
h7311734517346/*main.
c*/17347_PROTOTYPE(intmain,(void));1734817349/*misc.
c*/17350_PROTOTYPE(intdo_reboot,(void));17351_PROTOTYPE(intdo_getsysinfo,(void));17352_PROTOTYPE(intdo_getprocnr,(void));17353_PROTOTYPE(intdo_svrctl,(void));17354_PROTOTYPE(intdo_allocmem,(void));17355_PROTOTYPE(intdo_freemem,(void));17356_PROTOTYPE(intdo_getsetpriority,(void));1735717358_PROTOTYPE(voidsetreply,(intproc_nr,intresult));1735917360/*signal.
c*/17361_PROTOTYPE(intdo_alarm,(void));17362_PROTOTYPE(intdo_kill,(void));17363_PROTOTYPE(intksig_pending,(void));17364_PROTOTYPE(intdo_pause,(void));17365_PROTOTYPE(intset_alarm,(intproc_nr,intsec));17366_PROTOTYPE(intcheck_sig,(pid_tproc_id,intsigno));17367_PROTOTYPE(voidsig_proc,(structmproc*rmp,intsig_nr));17368_PROTOTYPE(intdo_sigaction,(void));17369_PROTOTYPE(intdo_sigpending,(void));17370_PROTOTYPE(intdo_sigprocmask,(void));17371_PROTOTYPE(intdo_sigreturn,(void));17372_PROTOTYPE(intdo_sigsuspend,(void));17373_PROTOTYPE(voidcheck_pending,(structmproc*rmp));1737417375/*time.
c*/17376_PROTOTYPE(intdo_stime,(void));17377_PROTOTYPE(intdo_time,(void));17378_PROTOTYPE(intdo_times,(void));17379_PROTOTYPE(intdo_gettimeofday,(void));1738017381/*timers.
c*/17382_PROTOTYPE(voidpm_set_timer,(timer_t*tp,intdelta,17383tmr_func_twatchdog,intarg));17384_PROTOTYPE(voidpm_expire_timers,(clock_tnow));17385_PROTOTYPE(voidpm_cancel_timer,(timer_t*tp));1738617387/*trace.
c*/17388_PROTOTYPE(intdo_trace,(void));17389_PROTOTYPE(voidstop_proc,(structmproc*rmp,intsig_nr));1739017391/*utility.
c*/17392_PROTOTYPE(pid_tget_free_pid,(void));17393_PROTOTYPE(intallowed,(char*name_buf,structstat*s_buf,intmask));17394_PROTOTYPE(intno_sys,(void));17395_PROTOTYPE(voidpanic,(char*who,char*mess,intnum));17396_PROTOTYPE(voidtell_fs,(intwhat,intp1,intp2,intp3));17397_PROTOTYPE(intget_stack_ptr,(intproc_nr,vir_bytes*sp));17398_PROTOTYPE(intget_mem_map,(intproc_nr,structmem_map*mem_map));17399_PROTOTYPE(char*find_param,(constchar*key));17400_PROTOTYPE(intproc_from_pid,(pid_tp));732File:servers/pm/glo.
hMINIXSOURCECODEservers/pm/glo.
h17500/*EXTERNshouldbeexternexceptintable.
c*/17501#ifdef_TABLE17502#undefEXTERN17503#defineEXTERN17504#endif1750517506/*Globalvariables.
*/17507EXTERNstructmproc*mp;/*ptrto'mproc'slotofcurrentprocess*/17508EXTERNintprocs_in_use;/*howmanyprocessesaremarkedasIN_USE*/17509EXTERNcharmonitor_params[128*sizeof(char*)];/*bootmonitorparameters*/17510EXTERNstructkinfokinfo;/*kernelinformation*/1751117512/*Theparametersofthecallarekepthere.
*/17513EXTERNmessagem_in;/*theincomingmessageitselfiskepthere.
*/17514EXTERNintwho;/*caller'sprocnumber*/17515EXTERNintcall_nr;/*systemcallnumber*/1751617517extern_PROTOTYPE(int(*call_vec[]),(void));/*systemcallhandlers*/17518externcharcore_name[];/*filenamewherecoreimagesareproduced*/17519EXTERNsigset_tcore_sset;/*whichsignalscausecoreimages*/17520EXTERNsigset_tign_sset;/*whichsignalsarebydefaultignored*/17521servers/pm/mproc.
h17600/*Thistablehasoneslotperprocess.
Itcontainsalltheprocessmanagement17601*informationforeachprocess.
Amongotherthings,itdefinesthetext,data17602*andstacksegments,uidsandgids,andvariousflags.
Thekernelandfile17603*systemshavetablesthatarealsoindexedbyprocess,withthecontents17604*ofcorrespondingslotsreferringtothesameprocessinallthree.
17605*/17606#include1760717608EXTERNstructmproc{17609structmem_mapmp_seg[NR_LOCAL_SEGS];/*pointstotext,data,stack*/17610charmp_exitstatus;/*storageforstatuswhenprocessexits*/17611charmp_sigstatus;/*storageforsignal#forkilledprocs*/17612pid_tmp_pid;/*processid*/17613pid_tmp_procgrp;/*pidofprocessgroup(usedforsignals)*/17614pid_tmp_wpid;/*pidthisprocessiswaitingfor*/17615intmp_parent;/*indexofparentprocess*/1761617617/*Childuserandsystemtimes.
Accountingdoneonchildexit.
*/17618clock_tmp_child_utime;/*cumulativeusertimeofchildren*/17619clock_tmp_child_stime;/*cumulativesystimeofchildren*/1762017621/*Realandeffectiveuidsandgids.
*/17622uid_tmp_realuid;/*process'realuid*/17623uid_tmp_effuid;/*process'effectiveuid*/17624gid_tmp_realgid;/*process'realgid*/MINIXSOURCECODEFile:servers/pm/mproc.
h73317625gid_tmp_effgid;/*process'effectivegid*/1762617627/*Fileidentificationforsharing.
*/17628ino_tmp_ino;/*inodenumberoffile*/17629dev_tmp_dev;/*devicenumberoffilesystem*/17630time_tmp_ctime;/*inodechangedtime*/1763117632/*Signalhandlinginformation.
*/17633sigset_tmp_ignore;/*1meansignorethesignal,0meansdon't*/17634sigset_tmp_catch;/*1meanscatchthesignal,0meansdon't*/17635sigset_tmp_sig2mess;/*1meanstransformintonotifymessage*/17636sigset_tmp_sigmask;/*signalstobeblocked*/17637sigset_tmp_sigmask2;/*savedcopyofmp_sigmask*/17638sigset_tmp_sigpending;/*pendingsignalstobehandled*/17639structsigactionmp_sigact[_NSIG+1];/*asinsigaction(2)*/17640vir_bytesmp_sigreturn;/*addressofClibrary__sigreturnfunction*/17641structtimermp_timer;/*watchdogtimerforalarm(2)*/1764217643/*Backwardscompatibilityforsignals.
*/17644sighandler_tmp_func;/*allsigsvectoredtoasingleuserfcn*/1764517646unsignedmp_flags;/*flagbits*/17647vir_bytesmp_procargs;/*ptrtoproc'sinitialstackarguments*/17648structmproc*mp_swapq;/*queueofprocswaitingtobeswappedin*/17649messagemp_reply;/*replymessagetobesenttoone*/1765017651/*Schedulingpriority.
*/17652signedintmp_nice;/*niceisPRIO_MIN.
.
PRIO_MAX,standard0.
*/1765317654charmp_name[PROC_NAME_LEN];/*processname*/17655}mproc[NR_PROCS];1765617657/*Flagvalues*/17658#defineIN_USE0x001/*setwhen'mproc'slotinuse*/17659#defineWAITING0x002/*setbyWAITsystemcall*/17660#defineZOMBIE0x004/*setbyEXIT,clearedbyWAIT*/17661#definePAUSED0x008/*setbyPAUSEsystemcall*/17662#defineALARM_ON0x010/*setwhenSIGALRMtimerstarted*/17663#defineSEPARATE0x020/*setiffileisseparateI&Dspace*/17664#defineTRACED0x040/*setifprocessistobetraced*/17665#defineSTOPPED0x080/*setifprocessstoppedfortracing*/17666#defineSIGSUSPENDED0x100/*setbySIGSUSPENDsystemcall*/17667#defineREPLY0x200/*setifareplymessageispending*/17668#defineONSWAP0x400/*setifdatasegmentisswappedout*/17669#defineSWAPIN0x800/*setifonthe"swapthisin"queue*/17670#defineDONT_SWAP0x1000/*neverswapoutthisprocess*/17671#definePRIV_PROC0x2000/*systemprocess,specialprivileges*/1767217673#defineNIL_MPROC((structmproc*)0)17674servers/pm/param.
h17700/*Thefollowingnamesaresynonymsforthevariablesintheinputmessage.
*/17701#defineaddrm1_p117702#defineexec_namem1_p117703#defineexec_lenm1_i117704#definefuncm6_f1734File:servers/pm/param.
hMINIXSOURCECODE17705#definegrp_idm1_i117706#definenamelenm1_i217707#definepidm1_i117708#defineprocnrm1_i117709#definesecondsm1_i117710#definesigm6_i117711#definestack_bytesm1_i217712#definestack_ptrm1_p217713#definestatusm1_i117714#defineusr_idm1_i117715#definerequestm2_i217716#definetaddrm2_l117717#definedatam2_l217718#definesig_nrm1_i217719#definesig_nsam1_p117720#definesig_osam1_p217721#definesig_retm1_p317722#definesig_setm2_l117723#definesig_howm2_i117724#definesig_flagsm2_i217725#definesig_contextm2_p117726#defineinfo_whatm1_i117727#defineinfo_wherem1_p117728#definereboot_flagm1_i117729#definereboot_codem1_p117730#definereboot_strlenm1_i217731#definesvrctl_reqm2_i117732#definesvrctl_argpm2_p117733#definestimem2_l117734#definememsizem4_l117735#definemembasem4_l21773617737/*Thefollowingnamesaresynonymsforthevariablesinareplymessage.
*/17738#definereply_resm_type17739#definereply_res2m2_i117740#definereply_ptrm2_p117741#definereply_maskm2_l117742#definereply_tracem2_l217743#definereply_timem2_l117744#definereply_utimem2_l217745#definereply_t1m4_l117746#definereply_t2m4_l217747#definereply_t3m4_l317748#definereply_t4m4_l417749#definereply_t5m4_l51775017751/*ThefollowingnamesareusedtoinformtheFSaboutcertainevents.
*/17752#definetell_fs_arg1m1_i117753#definetell_fs_arg2m1_i217754#definetell_fs_arg3m1_i317755MINIXSOURCECODEFile:servers/pm/table.
c735servers/pm/table.
c17800/*Thisfilecontainsthetableusedtomapsystemcallnumbersontothe17801*routinesthatperformthem.
17802*/1780317804#define_TABLE1780517806#include"pm.
h"17807#include17808#include17809#include"mproc.
h"17810#include"param.
h"1781117812/*Miscellaneous*/17813charcore_name[]="core";/*filenamewherecoreimagesareproduced*/1781417815_PROTOTYPE(int(*call_vec[NCALLS]),(void))={17816no_sys,/*0=unused*/17817do_pm_exit,/*1=exit*/17818do_fork,/*2=fork*/17819no_sys,/*3=read*/17820no_sys,/*4=write*/17821no_sys,/*5=open*/17822no_sys,/*6=close*/17823do_waitpid,/*7=wait*/17824no_sys,/*8=creat*/17825no_sys,/*9=link*/17826no_sys,/*10=unlink*/17827do_waitpid,/*11=waitpid*/17828no_sys,/*12=chdir*/17829do_time,/*13=time*/17830no_sys,/*14=mknod*/17831no_sys,/*15=chmod*/17832no_sys,/*16=chown*/17833do_brk,/*17=break*/17834no_sys,/*18=stat*/17835no_sys,/*19=lseek*/17836do_getset,/*20=getpid*/17837no_sys,/*21=mount*/17838no_sys,/*22=umount*/17839do_getset,/*23=setuid*/17840do_getset,/*24=getuid*/17841do_stime,/*25=stime*/17842do_trace,/*26=ptrace*/17843do_alarm,/*27=alarm*/17844no_sys,/*28=fstat*/17845do_pause,/*29=pause*/17846no_sys,/*30=utime*/17847no_sys,/*31=(stty)*/17848no_sys,/*32=(gtty)*/17849no_sys,/*33=access*/17850no_sys,/*34=(nice)*/17851no_sys,/*35=(ftime)*/17852no_sys,/*36=sync*/17853do_kill,/*37=kill*/17854no_sys,/*38=rename*/736File:servers/pm/table.
cMINIXSOURCECODE17855no_sys,/*39=mkdir*/17856no_sys,/*40=rmdir*/17857no_sys,/*41=dup*/17858no_sys,/*42=pipe*/17859do_times,/*43=times*/17860no_sys,/*44=(prof)*/17861no_sys,/*45=unused*/17862do_getset,/*46=setgid*/17863do_getset,/*47=getgid*/17864no_sys,/*48=(signal)*/17865no_sys,/*49=unused*/17866no_sys,/*50=unused*/17867no_sys,/*51=(acct)*/17868no_sys,/*52=(phys)*/17869no_sys,/*53=(lock)*/17870no_sys,/*54=ioctl*/17871no_sys,/*55=fcntl*/17872no_sys,/*56=(mpx)*/17873no_sys,/*57=unused*/17874no_sys,/*58=unused*/17875do_exec,/*59=execve*/17876no_sys,/*60=umask*/17877no_sys,/*61=chroot*/17878do_getset,/*62=setsid*/17879do_getset,/*63=getpgrp*/1788017881no_sys,/*64=unused*/17882no_sys,/*65=UNPAUSE*/17883no_sys,/*66=unused*/17884no_sys,/*67=REVIVE*/17885no_sys,/*68=TASK_REPLY*/17886no_sys,/*69=unused*/17887no_sys,/*70=unused*/17888do_sigaction,/*71=sigaction*/17889do_sigsuspend,/*72=sigsuspend*/17890do_sigpending,/*73=sigpending*/17891do_sigprocmask,/*74=sigprocmask*/17892do_sigreturn,/*75=sigreturn*/17893do_reboot,/*76=reboot*/17894do_svrctl,/*77=svrctl*/1789517896no_sys,/*78=unused*/17897do_getsysinfo,/*79=getsysinfo*/17898do_getprocnr,/*80=getprocnr*/17899no_sys,/*81=unused*/17900no_sys,/*82=fstatfs*/17901do_allocmem,/*83=memalloc*/17902do_freemem,/*84=memfree*/17903no_sys,/*85=select*/17904no_sys,/*86=fchdir*/17905no_sys,/*87=fsync*/17906do_getsetpriority,/*88=getpriority*/17907do_getsetpriority,/*89=setpriority*/17908do_time,/*90=gettimeofday*/17909};17910/*Thisshouldnotfailwith"arraysizeisnegative":*/17911externintdummy[sizeof(call_vec)==NCALLS*sizeof(call_vec[0])1:-1];MINIXSOURCECODEFile:servers/pm/main.
c737servers/pm/main.
c18000/*Thisfilecontainsthemainprogramoftheprocessmanagerandsomerelated18001*procedures.
WhenMINIXstartsup,thekernelrunsforalittlewhile,18002*initializingitselfanditstasks,andthenitrunsPMandFS.
BothPM18003*andFSinitializethemselvesasfarastheycan.
PMasksthekernelfor18004*allfreememoryandstartsservingrequests.
18005*18006*Theentrypointsintothisfileare:18007*main:startsPMrunning18008*setreply:setthereplytobesenttoprocessmakinganPMsystemcall18009*/1801018011#include"pm.
h"18012#include18013#include18014#include18015#include18016#include18017#include18018#include18019#include18020#include"mproc.
h"18021#include"param.
h"1802218023#include".
.
/.
.
/kernel/const.
h"18024#include".
.
/.
.
/kernel/config.
h"18025#include".
.
/.
.
/kernel/type.
h"18026#include".
.
/.
.
/kernel/proc.
h"1802718028FORWARD_PROTOTYPE(voidget_work,(void));18029FORWARD_PROTOTYPE(voidpm_init,(void));18030FORWARD_PROTOTYPE(intget_nice_value,(intqueue));18031FORWARD_PROTOTYPE(voidget_mem_chunks,(structmemory*mem_chunks));18032FORWARD_PROTOTYPE(voidpatch_mem_chunks,(structmemory*mem_chunks,18033structmem_map*map_ptr));1803418035#defineclick_to_round_k(n)\18036((unsigned)((((unsignedlong)(n)=NCALLS){18065result=ENOSYS;18066}else{18067result=(*call_vec[call_nr])();18068}1806918070/*Sendtheresultsbacktotheusertoindicatecompletion.
*/18071if(result!
=SUSPEND)setreply(who,result);1807218073swap_in();/*maybeaprocesscanbeswappedin*/1807418075/*Sendoutallpendingreplymessages,includingtheanswerto18076*thecalljustmadeabove.
Theprocessesmustnotbeswappedout.
18077*/18078for(proc_nr=0,rmp=mproc;proc_nrmp_flags&(REPLY|ONSWAP|IN_USE|ZOMBIE))==18085(REPLY|IN_USE)){18086if((s=send(proc_nr,&rmp->mp_reply))!
=OK){18087panic(__FILE__,"PMcan'treplyto",proc_nr);18088}18089rmp->mp_flags&=REPLY;18090}18091}18092}18093return(OK);18094}1809618097*get_work*1809818099PRIVATEvoidget_work()18100{18101/*Waitforthenextmessageandextractusefulinformationfromit.
*/18102if(receive(ANY,&m_in)!
=OK)panic(__FILE__,"PMreceiveerror",NO_NUM);18103who=m_in.
m_source;/*whosentthemessage*/18104call_nr=m_in.
m_type;/*systemcallnumber*/1810518106/*Processslotofcaller.
MisusePM'sownprocessslotifthekernelis18107*calling.
Thiscanhappenincaseofsynchronousalarms(CLOCK)oror18108*eventlikependingkernelsignals(SYSTEM).
18109*/18110mp=&mproc[whoccasionallyfillinotherfields,thisisonlyforthemainreturn18122*value,andforsettingthe"mustsendreply"flag.
18123*/18124registerstructmproc*rmp=&mproc[proc_nr];1812518126rmp->mp_reply.
reply_res=result;18127rmp->mp_flags|=REPLY;/*replypending*/1812818129if(rmp->mp_flags&ONSWAP)18130swap_inqueue(rmp);/*mustswapthisprocessbackin*/18131}1813318134*pm_init*1813518136PRIVATEvoidpm_init()18137{18138/*Initializetheprocessmanager.
18139*Memoryuseinfoiscollectedfromthebootmonitor,thekernel,and18140*allprocessescompiledintothesystemimage.
Initiallythisinformation18141*isputintoanarraymem_chunks.
Elementsofmem_chunksarestructmemory,18142*andholdbase,sizepairsinunitsofclicks.
Thisarrayissmall,there18143*shouldbenomorethan8chunks.
Afterthearrayofchunkshasbeenbuilt18144*thecontentsareusedtoinitializetheholelist.
Spacefortheholelist18145*isreservedasanarraywithtwiceasmanyelementsasthemaximumnumber18146*ofprocessesallowed.
Itismanagedasalinkedlist,andelementsofthe18147*arrayarestructhole,which,inadditiontostorageforabaseandsizein18148*clickunitsalsocontainspaceforalink,apointertoanotherelement.
18149*/18150ints;18151staticstructboot_imageimage[NR_BOOT_PROCS];18152registerstructboot_image*ip;18153staticcharcore_sigs[]={SIGQUIT,SIGILL,SIGTRAP,SIGABRT,18154SIGEMT,SIGFPE,SIGUSR1,SIGSEGV,SIGUSR2};18155staticcharign_sigs[]={SIGCHLD};18156registerstructmproc*rmp;18157registerchar*sig_ptr;18158phys_clickstotal_clicks,minix_clicks,free_clicks;18159messagemess;18160structmem_mapmem_map[NR_LOCAL_SEGS];18161structmemorymem_chunks[NR_MEMS];1816218163/*Initializeprocesstable,includingtimers.
*/18164for(rmp=&mproc[0];rmpmp_timer);18166}1816718168/*Buildthesetofsignalswhichcausecoredumps,andthesetofsignals18169*thatarebydefaultignored.
18170*/18171sigemptyset(&core_sset);18172for(sig_ptr=core_sigs;sig_ptrproc_nr>=0){/*taskhavenegativenrs*/18203procs_in_use+=1;/*founduserprocess*/1820418205/*Setprocessdetailsfoundintheimagetable.
*/18206rmp=&mproc[ip->proc_nr];18207strncpy(rmp->mp_name,ip->proc_name,PROC_NAME_LEN);18208rmp->mp_parent=RS_PROC_NR;18209rmp->mp_nice=get_nice_value(ip->priority);18210if(ip->proc_nr==INIT_PROC_NR){/*userprocess*/18211rmp->mp_pid=INIT_PID;18212rmp->mp_flags|=IN_USE;18213sigemptyset(&rmp->mp_ignore);18214}18215else{/*systemprocess*/18216rmp->mp_pid=get_free_pid();18217rmp->mp_flags|=IN_USE|DONT_SWAP|PRIV_PROC;18218sigfillset(&rmp->mp_ignore);18219}18220sigemptyset(&rmp->mp_sigmask);18221sigemptyset(&rmp->mp_catch);18222sigemptyset(&rmp->mp_sig2mess);1822318224/*Getmemorymapforthisprocessfromthekernel.
*/18225if((s=get_mem_map(ip->proc_nr,rmp->mp_seg))!
=OK)18226panic(__FILE__,"couldn'tgetprocessentry",s);18227if(rmp->mp_seg[T].
mem_len!
=0)rmp->mp_flags|=SEPARATE;18228minix_clicks+=rmp->mp_seg[S].
mem_phys+18229rmp->mp_seg[S].
mem_len-rmp->mp_seg[T].
mem_phys;18230patch_mem_chunks(mem_chunks,rmp->mp_seg);1823118232/*TellFSaboutthissystemprocess.
*/MINIXSOURCECODEFile:servers/pm/main.
c74118233mess.
PR_PROC_NR=ip->proc_nr;18234mess.
PR_PID=rmp->mp_pid;18235if(OK!
=(s=send(FS_PROC_NR,&mess)))18236panic(__FILE__,"can'tsyncupwithFS",s);18237printf("%s",ip->proc_name);/*displayprocessname*/18238}18239}18240printf(".
\n");/*lastprocessdone*/1824118242/*Overridesomedetails.
PMissomewhatspecial.
*/18243mproc[PM_PROC_NR].
mp_pid=PM_PID;/*magicallyoverridepid*/18244mproc[PM_PROC_NR].
mp_parent=PM_PROC_NR;/*PMdoesn'thaveparent*/1824518246/*TellFSthatnomoresystemprocessesfollowandsynchronize.
*/18247mess.
PR_PROC_NR=NONE;18248if(sendrec(FS_PROC_NR,&mess)!
=OK||mess.
m_type!
=OK)18249panic(__FILE__,"can'tsyncupwithFS",NO_NUM);1825018251/*Initializetablestoallphysicalmemoryandprintmemoryinformation.
*/18252printf("Physicalmemory:");18253mem_init(mem_chunks,&free_clicks);18254total_clicks=minix_clicks+free_clicks;18255printf("total%uKB,",click_to_round_k(total_clicks));18256printf("system%uKB,",click_to_round_k(minix_clicks));18257printf("free%uKB.
\n",click_to_round_k(free_clicks));18258}1826018261*get_nice_value*1826218263PRIVATEintget_nice_value(queue)18264intqueue;/*storememchunkshere*/18265{18266/*Processesinthebootimagehaveapriorityassigned.
ThePMdoesn'tknow18267*aboutpriorities,butuses'nice'valuesinstead.
Thepriorityisbetween18268*MIN_USER_QandMAX_USER_Q.
WehavetoscalebetweenPRIO_MINandPRIO_MAX.
18269*/18270intnice_val=(queue-USER_Q)*(PRIO_MAX-PRIO_MIN+1)/18271(MIN_USER_Q-MAX_USER_Q+1);18272if(nice_val>PRIO_MAX)nice_val=PRIO_MAX;/*shouldn'thappen*/18273if(nice_valbase=memp->size=0;18297}1829818299/*TheavailablememoryisdeterminedbyMINIX'bootloaderasalistof18300*(base:size)-pairsinboothead.
s.
The'memory'bootvariableissetin18301*inboot.
s.
Theformatis"b0:s0,b1:s1,b2:s2",whereb0:s0islowmem,18302*b1:s1ismembetween1Mand16M,b2:s2ismemabove16M.
Pairsb1:s118303*andb2:s2arecombinedifthememoryisadjacent.
18304*/18305s=find_param("memory");/*getmemorybootvariable*/18306for(i=0;ibase=base>>CLICK_SHIFT;18326memp->size=(limit-base)>>CLICK_SHIFT;18327}18328}1833018331*patch_mem_chunks*1833218333PRIVATEvoidpatch_mem_chunks(mem_chunks,map_ptr)18334structmemory*mem_chunks;/*storememchunkshere*/18335structmem_map*map_ptr;/*memorytoremove*/18336{18337/*Removeservermemoryfromthefreememorylist.
Thebootmonitor18338*promisestoputprocessesatthestartofmemorychunks.
The18339*tasksallusesamebaseaddress,soonlythefirsttaskchanges18340*thememorylists.
Theserversandinithavetheirownmemory18341*spacesandtheirmemorywillberemovedfromthelist.
18342*/18343structmemory*memp;18344for(memp=mem_chunks;mempbase==map_ptr[T].
mem_phys){18346memp->base+=map_ptr[T].
mem_len+map_ptr[D].
mem_len;18347memp->size-=map_ptr[T].
mem_len+map_ptr[D].
mem_len;18348}18349}18350}MINIXSOURCECODEFile:servers/pm/forkexit.
c743servers/pm/forkexit.
c18400/*Thisfiledealswithcreatingprocesses(viaFORK)anddeletingthem(via18401*EXIT/WAIT).
Whenaprocessforks,anewslotinthe'mproc'tableis18402*allocatedforit,andacopyoftheparent'scoreimageismadeforthe18403*child.
Thenthekernelandfilesystemareinformed.
Aprocessisremoved18404*fromthe'mproc'tablewhentwoeventshaveoccurred:(1)ithasexitedor18405*beenkilledbyasignal,and(2)theparenthasdoneaWAIT.
Iftheprocess18406*exitsfirst,itcontinuestooccupyaslotuntiltheparentdoesaWAIT.
18407*18408*Theentrypointsintothisfileare:18409*do_fork:performtheFORKsystemcall18410*do_pm_exit:performtheEXITsystemcall(bycallingpm_exit())18411*pm_exit:actuallydotheexiting18412*do_wait:performtheWAITPIDorWAITsystemcall18413*/1841418415#include"pm.
h"18416#include18417#include18418#include18419#include18420#include"mproc.
h"18421#include"param.
h"1842218423#defineLAST_FEW2/*lastfewslotsreservedforsuperuser*/1842418425FORWARD_PROTOTYPE(voidcleanup,(registerstructmproc*child));184261842718428*do_fork*1842918430PUBLICintdo_fork()18431{18432/*Theprocesspointedtoby'mp'hasforked.
Createachildprocess.
*/18433registerstructmproc*rmp;/*pointertoparent*/18434registerstructmproc*rmc;/*pointertochild*/18435intchild_nr,s;18436phys_clicksprog_clicks,child_base;18437phys_bytesprog_bytes,parent_abs,child_abs;/*Intelonly*/18438pid_tnew_pid;1843918440/*IftablesmightfillupduringFORK,don'tevenstartsincerecoveryhalf18441*waythroughissuchanuisance.
18442*/18443rmp=mp;18444if((procs_in_use==NR_PROCS)||18445(procs_in_use>=NR_PROCS-LAST_FEW&&rmp->mp_effuid!
=0))18446{18447printf("PM:warning,processtableisfull!
\n");18448return(EAGAIN);18449}1845018451/*Determinehowmuchmemorytoallocate.
Onlythedataandstackneedto18452*becopied,becausethetextsegmentiseithersharedorofzerolength.
18453*/18454prog_clicks=(phys_clicks)rmp->mp_seg[S].
mem_len;744File:servers/pm/forkexit.
cMINIXSOURCECODE18455prog_clicks+=(rmp->mp_seg[S].
mem_vir-rmp->mp_seg[D].
mem_vir);18456prog_bytes=(phys_bytes)prog_clicksmp_seg[D].
mem_physmp_flags&IN_USE)==0)break;1846818469/*Setupthechildanditsmemorymap;copyits'mproc'slotfromparent.
*/18470child_nr=(int)(rmc-mproc);/*slotnumberofthechild*/18471procs_in_use++;18472*rmc=*rmp;/*copyparent'sprocessslottochild's*/18473rmc->mp_parent=who;/*recordchild'sparent*/18474/*inheritonlytheseflags*/18475rmc->mp_flags&=(IN_USE|SEPARATE|PRIV_PROC|DONT_SWAP);18476rmc->mp_child_utime=0;/*resetadministration*/18477rmc->mp_child_stime=0;/*resetadministration*/1847818479/*AseparateI&Dchildkeepstheparentstextsegment.
Thedataandstack18480*segmentsmustrefertothenewcopy.
18481*/18482if(!
(rmc->mp_flags&SEPARATE))rmc->mp_seg[T].
mem_phys=child_base;18483rmc->mp_seg[D].
mem_phys=child_base;18484rmc->mp_seg[S].
mem_phys=rmc->mp_seg[D].
mem_phys+18485(rmp->mp_seg[S].
mem_vir-rmp->mp_seg[D].
mem_vir);18486rmc->mp_exitstatus=0;18487rmc->mp_sigstatus=0;1848818489/*Findafreepidforthechildandputitinthetable.
*/18490new_pid=get_free_pid();18491rmc->mp_pid=new_pid;/*assignpidtochild*/1849218493/*Tellkernelandfilesystemaboutthe(nowsuccessful)FORK.
*/18494sys_fork(who,child_nr);18495tell_fs(FORK,who,child_nr,rmc->mp_pid);1849618497/*Reportchild'smemorymaptokernel.
*/18498sys_newmap(child_nr,rmc->mp_seg);1849918500/*Replytochildtowakeitup.
*/18501setreply(child_nr,0);/*onlyparentgetsdetails*/18502rmp->mp_reply.
procnr=child_nr;/*child'sprocessnumber*/18503return(new_pid);/*child'spid*/18504}1850618507*do_pm_exit*1850818509PUBLICintdo_pm_exit()18510{18511/*Performtheexit(status)systemcall.
Therealworkisdonebypm_exit(),18512*whichisalsocalledwhenaprocessiskilledbyasignal.
18513*/18514pm_exit(mp,m_in.
status);MINIXSOURCECODEFile:servers/pm/forkexit.
c74518515return(SUSPEND);/*can'tcommunicatefrombeyondthegrave*/18516}1851818519*pm_exit*1852018521PUBLICvoidpm_exit(rmp,exit_status)18522registerstructmproc*rmp;/*pointertotheprocesstobeterminated*/18523intexit_status;/*theprocess'exitstatus(forparent)*/18524{18525/*Aprocessisdone.
Releasemostoftheprocess'possessions.
Ifits18526*parentiswaiting,releasetherest,elsekeeptheprocessslotand18527*becomeazombie.
18528*/18529registerintproc_nr;18530intparent_waiting,right_child;18531pid_tpidarg,procgrp;18532structmproc*p_mp;18533clock_tt[5];1853418535proc_nr=(int)(rmp-mproc);/*getprocessslotnumber*/1853618537/*Rememberasessionleader'sprocessgroup.
*/18538procgrp=(rmp->mp_pid==mp->mp_procgrp)mp->mp_procgrp:0;1853918540/*Iftheexitedprocesshasatimerpending,killit.
*/18541if(rmp->mp_flags&ALARM_ON)set_alarm(proc_nr,(unsigned)0);1854218543/*Doaccounting:fetchusagetimesandaccumulateatparent.
*/18544sys_times(proc_nr,t);18545p_mp=&mproc[rmp->mp_parent];/*process'parent*/18546p_mp->mp_child_utime+=t[0]+rmp->mp_child_utime;/*addusertime*/18547p_mp->mp_child_stime+=t[1]+rmp->mp_child_stime;/*addsystemtime*/1854818549/*TellthekernelandFSthattheprocessisnolongerrunnable.
*/18550tell_fs(EXIT,proc_nr,0,0);/*filesystemcanfreetheprocslot*/18551sys_exit(proc_nr);1855218553/*Pendingreplymessagesforthedeadprocesscannotbedelivered.
*/18554rmp->mp_flags&=REPLY;1855518556/*Releasethememoryoccupiedbythechild.
*/18557if(find_share(rmp,rmp->mp_ino,rmp->mp_dev,rmp->mp_ctime)==NULL){18558/*Nootherprocesssharesthetextsegment,sofreeit.
*/18559free_mem(rmp->mp_seg[T].
mem_phys,rmp->mp_seg[T].
mem_len);18560}18561/*Freethedataandstacksegments.
*/18562free_mem(rmp->mp_seg[D].
mem_phys,18563rmp->mp_seg[S].
mem_vir18564+rmp->mp_seg[S].
mem_len-rmp->mp_seg[D].
mem_vir);1856518566/*TheprocessslotcanonlybefreediftheparenthasdoneaWAIT.
*/18567rmp->mp_exitstatus=(char)exit_status;1856818569pidarg=p_mp->mp_wpid;/*who'sbeingwaitedfor*/18570parent_waiting=p_mp->mp_flags&WAITING;18571right_child=/*childmeetsoneofthe3tests*/18572(pidarg==-1||pidarg==rmp->mp_pid||-pidarg==rmp->mp_procgrp);1857318574if(parent_waiting&&right_child){746File:servers/pm/forkexit.
cMINIXSOURCECODE18575cleanup(rmp);/*tellparentandreleasechildslot*/18576}else{18577rmp->mp_flags=IN_USE|ZOMBIE;/*parentnotwaiting,zombifychild*/18578sig_proc(p_mp,SIGCHLD);/*sendparenta"childdied"signal*/18579}1858018581/*Iftheprocesshaschildren,disinheritthem.
INITisthenewparent.
*/18582for(rmp=&mproc[0];rmpmp_flags&IN_USE&&rmp->mp_parent==proc_nr){18584/*'rmp'nowpointstoachildtobedisinherited.
*/18585rmp->mp_parent=INIT_PROC_NR;18586parent_waiting=mproc[INIT_PROC_NR].
mp_flags&WAITING;18587if(parent_waiting&&(rmp->mp_flags&ZOMBIE))cleanup(rmp);18588}18589}1859018591/*Sendahanguptotheprocess'processgroupifitwasasessionleader.
*/18592if(procgrp!
=0)check_sig(-procgrp,SIGHUP);18593}1859518596*do_waitpid*1859718598PUBLICintdo_waitpid()18599{18600/*Aprocesswantstowaitforachildtoterminate.
Ifachildisalready18601*waiting,gocleanitupandletthisWAITcallterminate.
Otherwise,18602*reallywait.
18603*AprocesscallingWAITnevergetsareplyintheusualwayattheend18604*ofthemainloop(unlessWNOHANGissetornoqualifyingchildexists).
18605*Ifachildhasalreadyexited,theroutinecleanup()sendsthereply18606*toawakenthecaller.
18607*BothWAITandWAITPIDarehandledbythiscode.
18608*/18609registerstructmproc*rp;18610intpidarg,options,children;1861118612/*Setinternalvariables,dependingonwhetherthisisWAITorWAITPID.
*/18613pidarg=(call_nr==WAIT-1:m_in.
pid);/*1stparamofwaitpid*/18614options=(call_nr==WAIT0:m_in.
sig_nr);/*3rdparamofwaitpid*/18615if(pidarg==0)pidarg=-mp->mp_procgrp;/*pidargprocgrp*/1861618617/*IsthereachildwaitingtobecollectedAtthispoint,pidarg!
=0:18618*pidarg>0meanspidargispidofaspecificprocesstowaitfor18619*pidarg==-1meanswaitforanychild18620*pidargmp_flags&IN_USE)&&rp->mp_parent==who){18625/*Thevalueofpidargdetermineswhichchildrenqualify.
*/18626if(pidarg>0&&pidarg!
=rp->mp_pid)continue;18627if(pidargmp_procgrp)continue;1862818629children++;/*thischildisacceptable*/18630if(rp->mp_flags&ZOMBIE){18631/*Thischildmeetsthepidtestandhasexited.
*/18632cleanup(rp);/*thischildhasalreadyexited*/18633return(SUSPEND);18634}MINIXSOURCECODEFile:servers/pm/forkexit.
c74718635if((rp->mp_flags&STOPPED)&&rp->mp_sigstatus){18636/*Thischildmeetsthepidtestandisbeingtraced.
*/18637mp->mp_reply.
reply_res2=0177|(rp->mp_sigstatusmp_sigstatus=0;18639return(rp->mp_pid);18640}18641}18642}1864318644/*Noqualifyingchildhasexited.
Waitforone,unlessnoneexists.
*/18645if(children>0){18646/*Atleast1childmeetsthepidtestexists,buthasnotexited.
*/18647if(options&WNOHANG)return(0);/*parentdoesnotwanttowait*/18648mp->mp_flags|=WAITING;/*parentwantstowait*/18649mp->mp_wpid=(pid_t)pidarg;/*savepidforlater*/18650return(SUSPEND);/*donotreply,letitwait*/18651}else{18652/*Nochildevenmeetsthepidtest.
Returnerrorimmediately.
*/18653return(ECHILD);/*no-parenthasnochildren*/18654}18655}1865718658*cleanup*1865918660PRIVATEvoidcleanup(child)18661registerstructmproc*child;/*tellswhichprocessisexiting*/18662{18663/*Finishofftheexitofaprocess.
Theprocesshasexitedorbeenkilled18664*byasignal,anditsparentiswaiting.
18665*/18666structmproc*parent=&mproc[child->mp_parent];18667intexitstatus;1866818669/*Wakeuptheparentbysendingthereplymessage.
*/18670exitstatus=(child->mp_exitstatusmp_sigstatus&0377);18671parent->mp_reply.
reply_res2=exitstatus;18672setreply(child->mp_parent,child->mp_pid);18673parent->mp_flags&=WAITING;/*parentnolongerwaiting*/1867418675/*Releasetheprocesstableentryandreinitializesomefield.
*/18676child->mp_pid=0;18677child->mp_flags=0;18678child->mp_child_utime=0;18679child->mp_child_stime=0;18680procs_in_use--;18681}servers/pm/exec.
c18700/*ThisfilehandlestheEXECsystemcall.
Itperformstheworkasfollows:18701*-seeifthepermissionsallowthefiletobeexecuted18702*-readtheheaderandextractthesizes18703*-fetchtheinitialargsandenvironmentfromtheuserspace18704*-allocatethememoryforthenewprocess748File:servers/pm/exec.
cMINIXSOURCECODE18705*-copytheinitialstackfromPMtotheprocess18706*-readinthetextanddatasegmentsandcopytotheprocess18707*-takecareofsetuidandsetgidbits18708*-fixup'mproc'table18709*-tellkernelaboutEXEC18710*-saveoffsettoinitialargc(forps)18711*18712*Theentrypointsintothisfileare:18713*do_exec:performtheEXECsystemcall18714*rw_seg:readorwriteasegmentfromortoafile18715*find_share:findaprocesswhosetextsegmentcanbeshared18716*/1871718718#include"pm.
h"18719#include18720#include18721#include18722#include18723#include18724#include18725#include"mproc.
h"18726#include"param.
h"1872718728FORWARD_PROTOTYPE(intnew_mem,(structmproc*sh_mp,vir_bytestext_bytes,18729vir_bytesdata_bytes,vir_bytesbss_bytes,18730vir_bytesstk_bytes,phys_bytestot_bytes));18731FORWARD_PROTOTYPE(voidpatch_ptr,(charstack[ARG_MAX],vir_bytesbase));18732FORWARD_PROTOTYPE(intinsert_arg,(charstack[ARG_MAX],18733vir_bytes*stk_bytes,char*arg,intreplace));18734FORWARD_PROTOTYPE(char*patch_stack,(intfd,charstack[ARG_MAX],18735vir_bytes*stk_bytes,char*script));18736FORWARD_PROTOTYPE(intread_header,(intfd,int*ft,vir_bytes*text_bytes,18737vir_bytes*data_bytes,vir_bytes*bss_bytes,18738phys_bytes*tot_bytes,long*sym_bytes,vir_clickssc,18739vir_bytes*pc));1874018741#defineESCRIPT(-2000)/*Returnedbyread_headerfora#!
script.
*/18742#definePTRSIZEsizeof(char*)/*Sizeofpointersinargv[]andenvp[].
*/187431874418745*do_exec*1874618747PUBLICintdo_exec()18748{18749/*Performtheexecve(name,argv,envp)call.
Theuserlibrarybuildsa18750*completestackimage,includingpointers,args,environ,etc.
Thestack18751*iscopiedtoabufferinsidePM,andthentothenewcoreimage.
18752*/18753registerstructmproc*rmp;18754structmproc*sh_mp;18755intm,r,fd,ft,sn;18756staticcharmbuf[ARG_MAX];/*bufferforstackandzeroes*/18757staticcharname_buf[PATH_MAX];/*thenameofthefiletoexec*/18758char*new_sp,*name,*basename;18759vir_bytessrc,dst,text_bytes,data_bytes,bss_bytes,stk_bytes,vsp;18760phys_bytestot_bytes;/*totalspaceforprogram,includinggap*/18761longsym_bytes;18762vir_clickssc;18763structstats_buf[2],*s_p;18764vir_bytespc;MINIXSOURCECODEFile:servers/pm/exec.
c7491876518766/*Dosomevaliditychecks.
*/18767rmp=mp;18768stk_bytes=(vir_bytes)m_in.
stack_bytes;18769if(stk_bytes>ARG_MAX)return(ENOMEM);/*stacktoobig*/18770if(m_in.
exec_lenPATH_MAX)return(EINVAL);1877118772/*Gettheexecfilenameandseeifthefileisexecutable.
*/18773src=(vir_bytes)m_in.
exec_name;18774dst=(vir_bytes)name_buf;18775r=sys_datacopy(who,(vir_bytes)src,18776PM_PROC_NR,(vir_bytes)dst,(phys_bytes)m_in.
exec_len);18777if(r!
=OK)return(r);/*filenamenotinuserdatasegment*/1877818779/*Fetchthestackfromtheuserbeforedestroyingtheoldcoreimage.
*/18780src=(vir_bytes)m_in.
stack_ptr;18781dst=(vir_bytes)mbuf;18782r=sys_datacopy(who,(vir_bytes)src,18783PM_PROC_NR,(vir_bytes)dst,(phys_bytes)stk_bytes);18784/*can'tfetchstack(e.
g.
badvirtualaddr)*/18785if(r!
=OK)return(EACCES);1878618787r=0;/*r=0(firstattempt),or1(interpretedscript)*/18788name=name_buf;/*nameoffiletoexec.
*/18789do{18790s_p=&s_buf[r];18791tell_fs(CHDIR,who,FALSE,0);/*switchtotheuser'sFSenviron*/18792fd=allowed(name,s_p,X_BIT);/*isfileexecutable*/18793if(fd>CLICK_SHIFT;1879718798m=read_header(fd,&ft,&text_bytes,&data_bytes,&bss_bytes,18799&tot_bytes,&sym_bytes,sc,&pc);18800if(m!
=ESCRIPT||++r>1)break;18801}while((name=patch_stack(fd,mbuf,&stk_bytes,name_buf))!
=NULL);1880218803if(mARG_MAXENOMEM:ENOEXEC);18806}1880718808/*Cantheprocess'textbesharedwiththatofonealreadyrunning*/18809sh_mp=find_share(rmp,s_p->st_ino,s_p->st_dev,s_p->st_ctime);1881018811/*Allocatenewmemoryandreleaseoldmemory.
Fixmapandtellkernel.
*/18812r=new_mem(sh_mp,text_bytes,data_bytes,bss_bytes,stk_bytes,tot_bytes);18813if(r!
=OK){18814close(fd);/*insufficientcoreorprogramtoobig*/18815return(r);18816}1881718818/*Savefileidentificationtoallowittobeshared.
*/18819rmp->mp_ino=s_p->st_ino;18820rmp->mp_dev=s_p->st_dev;18821rmp->mp_ctime=s_p->st_ctime;1882218823/*PatchupstackandcopyitfromPMtonewcoreimage.
*/18824vsp=(vir_bytes)rmp->mp_seg[S].
mem_virmp_seg[S].
mem_lenmp_flags&TRACED)==0){/*suppressiftracing*/18845if(s_buf[0].
st_mode&I_SET_UID_BIT){18846rmp->mp_effuid=s_buf[0].
st_uid;18847tell_fs(SETUID,who,(int)rmp->mp_realuid,(int)rmp->mp_effuid);18848}18849if(s_buf[0].
st_mode&I_SET_GID_BIT){18850rmp->mp_effgid=s_buf[0].
st_gid;18851tell_fs(SETGID,who,(int)rmp->mp_realgid,(int)rmp->mp_effgid);18852}18853}1885418855/*Saveoffsettoinitialargc(forps)*/18856rmp->mp_procargs=vsp;1885718858/*Fix'mproc'fields,tellkernelthatexecisdone,resetcaughtsigs.
*/18859for(sn=1;snmp_catch,sn)){18861sigdelset(&rmp->mp_catch,sn);18862rmp->mp_sigact[sn].
sa_handler=SIG_DFL;18863sigemptyset(&rmp->mp_sigact[sn].
sa_mask);18864}18865}1886618867rmp->mp_flags&=SEPARATE;/*turnoffSEPARATEbit*/18868rmp->mp_flags|=ft;/*turnitonforseparateI&Dfiles*/18869new_sp=(char*)vsp;1887018871tell_fs(EXEC,who,0,0);/*allowFStohandleFD_CLOEXECfiles*/1887218873/*Systemwillsavecommandlinefordebugging,ps(1)output,etc.
*/18874basename=strrchr(name,'/');18875if(basename==NULL)basename=name;elsebasename++;18876strncpy(rmp->mp_name,basename,PROC_NAME_LEN-1);18877rmp->mp_name[PROC_NAME_LEN]='\0';18878sys_exec(who,new_sp,basename,pc);1887918880/*Causeasignalifthisprocessistraced.
*/18881if(rmp->mp_flags&TRACED)check_sig(rmp->mp_pid,SIGTRAP);1888218883return(SUSPEND);/*noreply,newprogramjustruns*/18884}MINIXSOURCECODEFile:servers/pm/exec.
c7511888618887*read_header*1888818889PRIVATEintread_header(fd,ft,text_bytes,data_bytes,bss_bytes,18890tot_bytes,sym_bytes,sc,pc)18891intfd;/*filedescriptorforreadingexecfile*/18892int*ft;/*placetoreturnftnumber*/18893vir_bytes*text_bytes;/*placetoreturntextsize*/18894vir_bytes*data_bytes;/*placetoreturninitializeddatasize*/18895vir_bytes*bss_bytes;/*placetoreturnbsssize*/18896phys_bytes*tot_bytes;/*placetoreturntotalsize*/18897long*sym_bytes;/*placetoreturnsymboltablesize*/18898vir_clickssc;/*stacksizeinclicks*/18899vir_bytes*pc;/*programentrypoint(initialPC)*/18900{18901/*Readtheheaderandextractthetext,data,bssandtotalsizesfromit.
*/1890218903intm,ct;18904vir_clickstc,dc,s_vir,dvir;18905phys_clickstotc;18906structexechdr;/*a.
outheaderisreadinhere*/1890718908/*Readtheheaderandcheckthemagicnumber.
ThestandardMINIXheader18909*isdefinedin.
Itconsistsof8charsfollowedby6longs.
18910*Thencome4morelongsthatarenotusedhere.
18911*Byte0:magicnumber0x0118912*Byte1:magicnumber0x0318913*Byte2:normal=0x10(notchecked,0isOK),separateI/D=0x2018914*Byte3:CPUtype,Intel16bit=0x04,Intel32bit=0x10,18915*Motorola=0x0B,SunSPARC=0x1718916*Byte4:Headerlength=0x2018917*Bytes5-7arenotused.
18918*18919*Nowcomethe6longs18920*Bytes8-11:sizeoftextsegmentsinbytes18921*Bytes12-15:sizeofinitializeddatasegmentinbytes18922*Bytes16-19:sizeofbssinbytes18923*Bytes20-23:programentrypoint18924*Bytes24-27:totalmemoryallocatedtoprogram(text,data+stack)18925*Bytes28-31:sizeofsymboltableinbytes18926*Thelongsarerepresentedinamachinedependentorder,18927*little-endianonthe8088,big-endianonthe68000.
18928*Theheaderisfolloweddirectlybythetextanddatasegments,andthe18929*symboltable(ifany).
Thesizesaregivenintheheader.
Onlythe18930*textanddatasegmentsarecopiedintomemorybyexec.
Theheaderis18931*usedhereonly.
Thesymboltableisforthebenefitofadebuggerand18932*isignoredhere.
18933*/1893418935if((m=read(fd,&hdr,A_MINHDR))>CLICK_SHIFT;18966dc=(*data_bytes+*bss_bytes+CLICK_SIZE-1)>>CLICK_SHIFT;18967totc=(*tot_bytes+CLICK_SIZE-1)>>CLICK_SHIFT;18968if(dc>=totc)return(ENOEXEC);/*stackmustbeatleast1click*/18969dvir=(*ft==SEPARATE0:tc);18970s_vir=dvir+(totc-sc);18971m=(dvir+dc>s_vir)ENOMEM:OK;18972ct=hdr.
a_hdrlen&BYTE;/*headerlength*/18973if(ct>A_MINHDR)lseek(fd,(off_t)ct,SEEK_SET);/*skipunusedhdr*/18974return(m);18975}1897718978*new_mem*1897918980PRIVATEintnew_mem(sh_mp,text_bytes,data_bytes,18981bss_bytes,stk_bytes,tot_bytes)18982structmproc*sh_mp;/*textcanbesharedwiththisprocess*/18983vir_bytestext_bytes;/*textsegmentsizeinbytes*/18984vir_bytesdata_bytes;/*sizeofinitializeddatainbytes*/18985vir_bytesbss_bytes;/*sizeofbssinbytes*/18986vir_bytesstk_bytes;/*sizeofinitialstacksegmentinbytes*/18987phys_bytestot_bytes;/*totalmemorytoallocate,includinggap*/18988{18989/*Allocatenewmemoryandreleasetheoldmemory.
Changethemapandreport18990*thenewmaptothekernel.
Zerothenewcoreimage'sbss,gapandstack.
18991*/1899218993registerstructmproc*rmp=mp;18994vir_clickstext_clicks,data_clicks,gap_clicks,stack_clicks,tot_clicks;18995phys_clicksnew_base;18996phys_bytesbytes,base,bss_offset;18997ints;1899818999/*Noneedtoallocatetextifitcanbeshared.
*/19000if(sh_mp!
=NULL)text_bytes=0;1900119002/*Allowtheolddatatobeswappedouttomakeroom.
(Whichisreallya19003*wasteoftime,becausewearegoingtothrowitawayanyway.
)19004*/MINIXSOURCECODEFile:servers/pm/exec.
c75319005rmp->mp_flags|=WAITING;1900619007/*Acquirethenewmemory.
Eachofthe4parts:text,(data+bss),gap,19008*andstackoccupiesanintegralnumberofclicks,startingatclick19009*boundary.
Thedataandbsspartsareruntogetherwithnospace.
19010*/19011text_clicks=((unsignedlong)text_bytes+CLICK_SIZE-1)>>CLICK_SHIFT;19012data_clicks=(data_bytes+bss_bytes+CLICK_SIZE-1)>>CLICK_SHIFT;19013stack_clicks=(stk_bytes+CLICK_SIZE-1)>>CLICK_SHIFT;19014tot_clicks=(tot_bytes+CLICK_SIZE-1)>>CLICK_SHIFT;19015gap_clicks=tot_clicks-data_clicks-stack_clicks;19016if((int)gap_clicksmp_ino,rmp->mp_dev,rmp->mp_ctime)==NULL){19026/*Nootherprocesssharesthetextsegment,sofreeit.
*/19027free_mem(rmp->mp_seg[T].
mem_phys,rmp->mp_seg[T].
mem_len);19028}19029/*Freethedataandstacksegments.
*/19030free_mem(rmp->mp_seg[D].
mem_phys,19031rmp->mp_seg[S].
mem_vir+rmp->mp_seg[S].
mem_len-rmp->mp_seg[D].
mem_vir);1903219033/*Wehavenowpassedthepointofnoreturn.
Theoldcoreimagehasbeen19034*foreverlost,memoryforanewcoreimagehasbeenallocated.
Setup19035*andreportnewmap.
19036*/19037if(sh_mp!
=NULL){19038/*Sharethetextsegment.
*/19039rmp->mp_seg[T]=sh_mp->mp_seg[T];19040}else{19041rmp->mp_seg[T].
mem_phys=new_base;19042rmp->mp_seg[T].
mem_vir=0;19043rmp->mp_seg[T].
mem_len=text_clicks;19044}19045rmp->mp_seg[D].
mem_phys=new_base+text_clicks;19046rmp->mp_seg[D].
mem_vir=0;19047rmp->mp_seg[D].
mem_len=data_clicks;19048rmp->mp_seg[S].
mem_phys=rmp->mp_seg[D].
mem_phys+data_clicks+gap_clicks;19049rmp->mp_seg[S].
mem_vir=rmp->mp_seg[D].
mem_vir+data_clicks+gap_clicks;19050rmp->mp_seg[S].
mem_len=stack_clicks;1905119052sys_newmap(who,rmp->mp_seg);/*reportnewmaptothekernel*/1905319054/*Theoldmemorymayhavebeenswappedout,butthenewmemoryisreal.
*/19055rmp->mp_flags&=(WAITING|ONSWAP|SWAPIN);1905619057/*Zerothebss,gap,andstacksegment.
*/19058bytes=(phys_bytes)(data_clicks+gap_clicks+stack_clicks)mp_seg[D].
mem_phys>CLICK_SHIFT)=(char**)&stack[ARG_MAX])return;/*toobad*/19092if(*ap!
=NULL){19093v=(vir_bytes)*ap;/*visrelativepointer*/19094v+=base;/*relocateit*/19095*ap=(char*)v;/*putitback*/19096}else{19097flag++;19098}19099ap++;19100}19101}1910319104*insert_arg*1910519106PRIVATEintinsert_arg(stack,stk_bytes,arg,replace)19107charstack[ARG_MAX];/*pointertostackimagewithinPM*/19108vir_bytes*stk_bytes;/*sizeofinitialstack*/19109char*arg;/*argumenttoprepend/replaceasnewargv[0]*/19110intreplace;19111{19112/*Patchthestacksothatargwillbecomeargv[0].
Becareful,thestackmay19113*befilledwithgarbage,althoughitnormallylookslikethis:19114*nargsargv[0].
.
.
argv[nargs-1]NULLenvp[0].
.
.
NULL19115*followedbythestrings"pointed"tobytheargv[i]andtheenvp[i].
The19116*pointersarereallyoffsetsfromthestartofstack.
19117*Returntrueifftheoperationsucceeded.
19118*/19119intoffset,a0,a1,old_bytes=*stk_bytes;1912019121/*Prependingargaddsatleastonestringandazerobyte.
*/19122offset=strlen(arg)+1;1912319124a0=(int)((char**)stack)[1];/*argv[0]*/MINIXSOURCECODEFile:servers/pm/exec.
c75519125if(a0=old_bytes)return(FALSE);1912619127a1=a0;/*a1willpointtothestringstobemoved*/19128if(replace){19129/*Movea1totheendofargv[0][](argv[1]ifnargs>1).
*/19130do{19131if(a1==old_bytes)return(FALSE);19132--offset;19133}while(stack[a1++]!
=0);19134}else{19135offset+=PTRSIZE;/*newargv[0]needsnewpointerinargv[]*/19136a0+=PTRSIZE;/*locationofnewargv[0][].
*/19137}1913819139/*stackwillgrowbyoffsetbytes(orshrinkby-offsetbytes)*/19140if((*stk_bytes+=offset)>ARG_MAX)return(FALSE);1914119142/*Repositionthestringsbyoffsetbytes*/19143memmove(stack+a1+offset,stack+a1,old_bytes-a1);1914419145strcpy(stack+a0,arg);/*Putarginthenewspace.
*/1914619147if(!
replace){19148/*Makespaceforanewargv[0].
*/19149memmove(stack+2*PTRSIZE,stack+1*PTRSIZE,a0-2*PTRSIZE);1915019151((char**)stack)[0]++;/*nargs++;*/19152}19153/*Nowpatchupargv[]andenvp[]byoffset.
*/19154patch_ptr(stack,(vir_bytes)offset);19155((char**)stack)[1]=(char*)a0;/*setargv[0]correctly*/19156return(TRUE);19157}1915919160*patch_stack*1916119162PRIVATEchar*patch_stack(fd,stack,stk_bytes,script)19163intfd;/*filedescriptortoopenscriptfile*/19164charstack[ARG_MAX];/*pointertostackimagewithinPM*/19165vir_bytes*stk_bytes;/*sizeofinitialstack*/19166char*script;/*nameofscripttointerpret*/19167{19168/*Patchtheargumentvectortoincludethepathnameofthescripttobe19169*interpreted,andallstringsonthe#!
line.
Returnsthepathnameof19170*theinterpreter.
19171*/19172char*sp,*interp=NULL;19173intn;19174enum{INSERT=FALSE,REPLACE=TRUE};1917519176/*Makescript[]thenewargv[0].
*/19177if(!
insert_arg(stack,stk_bytes,script,REPLACE))return(NULL);1917819179if(lseek(fd,2L,0)==-1/*justbehindthe#!
*/19180||(n=read(fd,script,PATH_MAX))script&&(*--spsp=='\t')){}19188if(sp==script)break;1918919190sp[1]=0;19191/*Movetothestartoftheargument.
*/19192while(sp>script&&sp[-1]sp[-1]!
='\t')--sp;1919319194interp=sp;19195if(!
insert_arg(stack,stk_bytes,sp,INSERT))return(NULL);19196}1919719198/*Round*stk_bytesuptothesizeofapointerforalignmentcontraints.
*/19199*stk_bytes=((*stk_bytes+PTRSIZE-1)/PTRSIZE)*PTRSIZE;1920019201close(fd);19202return(interp);19203}1920519206*rw_seg*1920719208PUBLICvoidrw_seg(rw,fd,proc,seg,seg_bytes0)19209intrw;/*0=read,1=write*/19210intfd;/*filedescriptortoreadfrom/writeto*/19211intproc;/*processnumber*/19212intseg;/*T,D,orS*/19213phys_bytesseg_bytes0;/*howmuchistobetransferred*/19214{19215/*Transfertextordatafrom/toafileandcopyto/fromaprocesssegment.
19216*Thisprocedureisalittlebittricky.
Thelogicalwaytotransfera19217*segmentwouldbeblockbyblockandcopyingeachblockto/fromtheuser19218*spaceoneatatime.
Thisistooslow,sowedosomethingdirtyhere,19219*namelysendtheuserspaceandvirtualaddresstothefilesysteminthe19220*upper10bitsofthefiledescriptor,andpassittheuservirtualaddress19221*insteadofaPMaddress.
Thefilesystemextractstheseparameterswhen19222*getsareadorwritecallfromtheprocessmanager,whichistheonly19223*processthatispermittedtousethistrick.
Thefilesystemthencopies19224*thewholesegmentdirectlyto/fromuserspace,bypassingPMcompletely.
19225*19226*Thebytecountonreadisusuallysmallerthanthesegmentcount,because19227*asegmentispaddedouttoaclickmultiple,andthedatasegmentisonly19228*partiallyinitialized.
19229*/1923019231intnew_fd,bytes,r;19232char*ubuf_ptr;19233structmem_map*sp=&mproc[proc].
mp_seg[seg];19234phys_bytesseg_bytes=seg_bytes0;1923519236new_fd=(procmem_virinexecution.
Don't19263*accidentally"find"mp_ign,becauseitistheprocessonwhosebehalfthis19264*callismade.
19265*/19266structmproc*sh_mp;19267for(sh_mp=&mproc[0];sh_mpmp_flags&SEPARATE))continue;19270if(sh_mp==mp_ign)continue;19271if(sh_mp->mp_ino!
=ino)continue;19272if(sh_mp->mp_dev!
=dev)continue;19273if(sh_mp->mp_ctime!
=ctime)continue;19274returnsh_mp;19275}19276return(NULL);19277}servers/pm/break.
c19300/*TheMINIXmodelofmemoryallocationreservesafixedamountofmemoryfor19301*thecombinedtext,data,andstacksegments.
Theamountusedforachild19302*processcreatedbyFORKisthesameastheparenthad.
Ifthechilddoes19303*anEXEClater,thenewsizeistakenfromtheheaderofthefileEXEC'ed.
19304*19305*Thelayoutinmemoryconsistsofthetextsegment,followedbythedata19306*segment,followedbyagap(unusedmemory),followedbythestacksegment.
19307*Thedatasegmentgrowsupwardandthestackgrowsdownward,soeachcan19308*takememoryfromthegap.
Iftheymeet,theprocessmustbekilled.
The19309*proceduresinthisfiledealwiththegrowthofthedataandstacksegments.
19310*19311*Theentrypointsintothisfileare:19312*do_brk:BRK/SBRKsystemcallstogroworshrinkthedatasegment19313*adjust:seeifaproposedsegmentadjustmentisallowed19314*size_ok:seeifthesegmentsizesarefeasible19315*/1931619317#include"pm.
h"19318#include19319#include"mproc.
h"758File:servers/pm/break.
cMINIXSOURCECODE19320#include"param.
h"1932119322#defineDATA_CHANGED1/*flagvaluewhendatasegmentsizechanged*/19323#defineSTACK_CHANGED2/*flagvaluewhenstacksizechanged*/193241932519326*do_brk*1932719328PUBLICintdo_brk()19329{19330/*Performthebrk(addr)systemcall.
19331*19332*Thecalliscomplicatedbythefactthatonsomemachines(e.
g.
,8088),19333*thestackpointercangrowbeyondthebaseofthestacksegmentwithout19334*anybodynoticingit.
19335*Theparameter,'addr'isthenewvirtualaddressinDspace.
19336*/1933719338registerstructmproc*rmp;19339intr;19340vir_bytesv,new_sp;19341vir_clicksnew_clicks;1934219343rmp=mp;19344v=(vir_bytes)m_in.
addr;19345new_clicks=(vir_clicks)(((long)v+CLICK_SIZE-1)>>CLICK_SHIFT);19346if(new_clicksmp_seg[D].
mem_vir){19347rmp->mp_reply.
reply_ptr=(char*)-1;19348return(ENOMEM);19349}19350new_clicks-=rmp->mp_seg[D].
mem_vir;19351if((r=get_stack_ptr(who,&new_sp))!
=OK)/*askkernelforspvalue*/19352panic(__FILE__,"couldn'tgetstackpointer",r);19353r=adjust(rmp,new_clicks,new_sp);19354rmp->mp_reply.
reply_ptr=(r==OKm_in.
addr:(char*)-1);19355return(r);/*returnnewaddressor-1*/19356}1935819359*adjust*1936019361PUBLICintadjust(rmp,data_clicks,sp)19362registerstructmproc*rmp;/*whosememoryisbeingadjusted*/19363vir_clicksdata_clicks;/*howbigisdatasegmenttobecome*/19364vir_bytessp;/*newvalueofsp*/19365{19366/*Seeifdataandstacksegmentscancoexist,adjustingthemifneedbe.
19367*Memoryisneverallocatedorfreed.
Insteaditisaddedorremovedfromthe19368*gapbetweendatasegmentandstacksegment.
Ifthegapsizebecomes19369*negative,theadjustmentofdataorstackfailsandENOMEMisreturned.
19370*/1937119372registerstructmem_map*mem_sp,*mem_dp;19373vir_clickssp_click,gap_base,lower,old_clicks;19374intchanged,r,ft;19375longbase_of_stack,delta;/*longsavoidcertainproblems*/1937619377mem_dp=&rmp->mp_seg[D];/*pointertodatasegmentmap*/19378mem_sp=&rmp->mp_seg[S];/*pointertostacksegmentmap*/19379changed=0;/*setwheneithersegmentchanged*/MINIXSOURCECODEFile:servers/pm/break.
c7591938019381if(mem_sp->mem_len==0)return(OK);/*don'tbotherinit*/1938219383/*Seeifstacksizehasgonenegative(i.
e.
,sptoocloseto0xFFFF.
.
.
)*/19384base_of_stack=(long)mem_sp->mem_vir+(long)mem_sp->mem_len;19385sp_click=sp>>CLICK_SHIFT;/*clickcontainingsp*/19386if(sp_click>=base_of_stack)return(ENOMEM);/*sptoohigh*/1938719388/*Computesizeofgapbetweenstackanddatasegments.
*/19389delta=(long)mem_sp->mem_vir-(long)sp_click;19390lower=(delta>0sp_click:mem_sp->mem_vir);1939119392/*Addasafetymarginforfuturestackgrowth.
Impossibletodoright.
*/19393#defineSAFETY_BYTES(384*sizeof(char*))19394#defineSAFETY_CLICKS((SAFETY_BYTES+CLICK_SIZE-1)/CLICK_SIZE)19395gap_base=mem_dp->mem_vir+data_clicks+SAFETY_CLICKS;19396if(lowermem_len;19400if(data_clicks!
=mem_dp->mem_len){19401mem_dp->mem_len=data_clicks;19402changed|=DATA_CHANGED;19403}1940419405/*Updatestacklengthandoriginduetochangeinstackpointer.
*/19406if(delta>0){19407mem_sp->mem_vir-=delta;19408mem_sp->mem_phys-=delta;19409mem_sp->mem_len+=delta;19410changed|=STACK_CHANGED;19411}1941219413/*Dothenewdataandstacksegmentsizesfitintheaddressspace*/19414ft=(rmp->mp_flags&SEPARATE);19415r=(rmp->mp_seg[D].
mem_vir+rmp->mp_seg[D].
mem_len>19416rmp->mp_seg[S].
mem_vir)ENOMEM:OK;19417if(r==OK){19418if(changed)sys_newmap((int)(rmp-mproc),rmp->mp_seg);19419return(OK);19420}1942119422/*Newsizesdon'tfitorrequiretoomanypage/segmentregisters.
Restore.
*/19423if(changed&DATA_CHANGED)mem_dp->mem_len=old_clicks;19424if(changed&STACK_CHANGED){19425mem_sp->mem_vir+=delta;19426mem_sp->mem_phys+=delta;19427mem_sp->mem_len-=delta;19428}19429return(ENOMEM);19430}760File:servers/pm/signal.
cMINIXSOURCECODEservers/pm/signal.
c19500/*Thisfilehandlessignals,whichareasynchronouseventsandaregenerally19501*amessyandunpleasantbusiness.
SignalscanbegeneratedbytheKILL19502*systemcall,orfromthekeyboard(SIGINT)orfromtheclock(SIGALRM).
19503*Inallcasescontroleventuallypassestocheck_sig()toseewhichprocesses19504*canbesignaled.
Theactualsignalingisdonebysig_proc().
19505*19506*Theentrypointsintothisfileare:19507*do_sigaction:performtheSIGACTIONsystemcall19508*do_sigpending:performtheSIGPENDINGsystemcall19509*do_sigprocmask:performtheSIGPROCMASKsystemcall19510*do_sigreturn:performtheSIGRETURNsystemcall19511*do_sigsuspend:performtheSIGSUSPENDsystemcall19512*do_kill:performtheKILLsystemcall19513*do_alarm:performtheALARMsystemcallbycallingset_alarm()19514*set_alarm:telltheclocktasktostartorstopatimer19515*do_pause:performthePAUSEsystemcall19516*ksig_pending:thekernelnotifiedaboutpendingsignals19517*sig_proc:interruptorterminateasignaledprocess19518*check_sig:checkwhichprocessestosignalwithsig_proc()19519*check_pending:checkifapendingsignalcannowbedelivered19520*/1952119522#include"pm.
h"19523#include19524#include19525#include19526#include19527#include19528#include19529#include19530#include"mproc.
h"19531#include"param.
h"1953219533#defineCORE_MODE0777/*modetouseoncoreimagefiles*/19534#defineDUMPED0200/*bitsetinstatuswhencoredumped*/1953519536FORWARD_PROTOTYPE(voiddump_core,(structmproc*rmp));19537FORWARD_PROTOTYPE(voidunpause,(intpro));19538FORWARD_PROTOTYPE(voidhandle_sig,(intproc_nr,sigset_tsig_map));19539FORWARD_PROTOTYPE(voidcause_sigalrm,(structtimer*tp));195401954119542*do_sigaction*1954319544PUBLICintdo_sigaction()19545{19546intr;19547structsigactionsvec;19548structsigaction*svp;1954919550if(m_in.
sig_nr==SIGKILL)return(OK);19551if(m_in.
sig_nr_NSIG)return(EINVAL);19552svp=&mp->mp_sigact[m_in.
sig_nr];19553if((structsigaction*)m_in.
sig_osa!
=(structsigaction*)NULL){19554r=sys_datacopy(PM_PROC_NR,(vir_bytes)svp,MINIXSOURCECODEFile:servers/pm/signal.
c76119555who,(vir_bytes)m_in.
sig_osa,(phys_bytes)sizeof(svec));19556if(r!
=OK)return(r);19557}1955819559if((structsigaction*)m_in.
sig_nsa==(structsigaction*)NULL)19560return(OK);1956119562/*Readinthesigactionstructure.
*/19563r=sys_datacopy(who,(vir_bytes)m_in.
sig_nsa,19564PM_PROC_NR,(vir_bytes)&svec,(phys_bytes)sizeof(svec));19565if(r!
=OK)return(r);1956619567if(svec.
sa_handler==SIG_IGN){19568sigaddset(&mp->mp_ignore,m_in.
sig_nr);19569sigdelset(&mp->mp_sigpending,m_in.
sig_nr);19570sigdelset(&mp->mp_catch,m_in.
sig_nr);19571sigdelset(&mp->mp_sig2mess,m_in.
sig_nr);19572}elseif(svec.
sa_handler==SIG_DFL){19573sigdelset(&mp->mp_ignore,m_in.
sig_nr);19574sigdelset(&mp->mp_catch,m_in.
sig_nr);19575sigdelset(&mp->mp_sig2mess,m_in.
sig_nr);19576}elseif(svec.
sa_handler==SIG_MESS){19577if(!
(mp->mp_flags&PRIV_PROC))return(EPERM);19578sigdelset(&mp->mp_ignore,m_in.
sig_nr);19579sigaddset(&mp->mp_sig2mess,m_in.
sig_nr);19580sigdelset(&mp->mp_catch,m_in.
sig_nr);19581}else{19582sigdelset(&mp->mp_ignore,m_in.
sig_nr);19583sigaddset(&mp->mp_catch,m_in.
sig_nr);19584sigdelset(&mp->mp_sig2mess,m_in.
sig_nr);19585}19586mp->mp_sigact[m_in.
sig_nr].
sa_handler=svec.
sa_handler;19587sigdelset(&svec.
sa_mask,SIGKILL);19588mp->mp_sigact[m_in.
sig_nr].
sa_mask=svec.
sa_mask;19589mp->mp_sigact[m_in.
sig_nr].
sa_flags=svec.
sa_flags;19590mp->mp_sigreturn=(vir_bytes)m_in.
sig_ret;19591return(OK);19592}1959419595*do_sigpending*1959619597PUBLICintdo_sigpending()19598{19599mp->mp_reply.
reply_mask=(long)mp->mp_sigpending;19600returnOK;19601}1960319604*do_sigprocmask*1960519606PUBLICintdo_sigprocmask()19607{19608/*Notethatthelibraryinterfacepassestheactualmaskinsigmask_set,19609*notapointertothemask,inordertosaveacopy.
Similarly,19610*theoldmaskisplacedinthereturnmessagewhichthelibrary19611*interfacecopies(ifrequested)totheuserspecifiedaddress.
19612*19613*ThelibraryinterfacemustsetSIG_INQUIREifthe'act'argument19614*isNULL.
762File:servers/pm/signal.
cMINIXSOURCECODE19615*/1961619617inti;1961819619mp->mp_reply.
reply_mask=(long)mp->mp_sigmask;1962019621switch(m_in.
sig_how){19622caseSIG_BLOCK:19623sigdelset((sigset_t*)&m_in.
sig_set,SIGKILL);19624for(i=1;imp_sigmask,i);19627}19628break;1962919630caseSIG_UNBLOCK:19631for(i=1;imp_sigmask,i);19634}19635check_pending(mp);19636break;1963719638caseSIG_SETMASK:19639sigdelset((sigset_t*)&m_in.
sig_set,SIGKILL);19640mp->mp_sigmask=(sigset_t)m_in.
sig_set;19641check_pending(mp);19642break;1964319644caseSIG_INQUIRE:19645break;1964619647default:19648return(EINVAL);19649break;19650}19651returnOK;19652}1965419655*do_sigsuspend*1965619657PUBLICintdo_sigsuspend()19658{19659mp->mp_sigmask2=mp->mp_sigmask;/*savetheoldmask*/19660mp->mp_sigmask=(sigset_t)m_in.
sig_set;19661sigdelset(&mp->mp_sigmask,SIGKILL);19662mp->mp_flags|=SIGSUSPENDED;19663check_pending(mp);19664return(SUSPEND);19665}1966719668*do_sigreturn*1966919670PUBLICintdo_sigreturn()19671{19672/*Ausersignalhandlerisdone.
Restorecontextandcheckfor19673*pendingunblockedsignals.
19674*/MINIXSOURCECODEFile:servers/pm/signal.
c7631967519676intr;1967719678mp->mp_sigmask=(sigset_t)m_in.
sig_set;19679sigdelset(&mp->mp_sigmask,SIGKILL);1968019681r=sys_sigreturn(who,(structsigmsg*)m_in.
sig_context);19682check_pending(mp);19683return(r);19684}1968619687*do_kill*1968819689PUBLICintdo_kill()19690{19691/*Performthekill(pid,signo)systemcall.
*/1969219693returncheck_sig(m_in.
pid,m_in.
sig_nr);19694}1969619697*ksig_pending*1969819699PUBLICintksig_pending()19700{19701/*Certainsignals,suchassegmentationviolationsoriginateinthekernel.
19702*Whenthekerneldetectssuchsignals,itnotifiesthePMtotakefurther19703*action.
ThePMrequeststhekerneltosendmessageswiththeprocess19704*slotandbitmapforallsignaledprocesses.
TheFileSystem,forexample,19705*usesthismechanismtosignalwritingonbrokenpipes(SIGPIPE).
19706*19707*ThekernelhasnotifiedthePMaboutpendingsignals.
Requestpending19708*signalsuntilallsignalsarehandled.
Iftherearenomoresignals,19709*NONEisreturnedintheprocessnumberfield.
19710*/19711intproc_nr;19712sigset_tsig_map;1971319714while(TRUE){19715sys_getksig(&proc_nr,&sig_map);/*getanarbitrarypendingsignal*/19716if(NONE==proc_nr){/*stopifnomorependingsignals*/19717break;19718}else{19719handle_sig(proc_nr,sig_map);/*handlethereceivedsignal*/19720sys_endksig(proc_nr);/*tellkernelit'sdone*/19721}19722}19723return(SUSPEND);/*preventssendingreply*/19724}1972619727*handle_sig*1972819729PRIVATEvoidhandle_sig(proc_nr,sig_map)19730intproc_nr;19731sigset_tsig_map;19732{19733registerstructmproc*rmp;19734inti;764File:servers/pm/signal.
cMINIXSOURCECODE19735pid_tproc_id,id;1973619737rmp=&mproc[proc_nr];19738if((rmp->mp_flags&(IN_USE|ZOMBIE))!
=IN_USE)return;19739proc_id=rmp->mp_pid;19740mp=&mproc[0];/*pretendsignalsarefromPM*/19741mp->mp_procgrp=rmp->mp_procgrp;/*getprocessgroupright*/1974219743/*Checkeachbitinturntoseeifasignalistobesent.
Unlike19744*kill(),thekernelmaycollectseveralunrelatedsignalsfora19745*processandpassthemtoPMinoneblow.
Thuslooponthebit19746*map.
ForSIGINTandSIGQUIT,useproc_id0toindicateabroadcast19747*totherecipient'sprocessgroup.
ForSIGKILL,useproc_id-1to19748*indicateasystemwidebroadcast.
19749*/19750for(i=1;ita_int;/*getprocessfromtimer*/19842rmp=&mproc[proc_nr];1984319844if((rmp->mp_flags&(IN_USE|ZOMBIE))!
=IN_USE)return;19845if((rmp->mp_flags&ALARM_ON)==0)return;19846rmp->mp_flags&=ALARM_ON;19847check_sig(rmp->mp_pid,SIGALRM);19848}1985019851*do_pause*1985219853PUBLICintdo_pause()19854{766File:servers/pm/signal.
cMINIXSOURCECODE19855/*Performthepause()systemcall.
*/1985619857mp->mp_flags|=PAUSED;19858return(SUSPEND);19859}1986119862*sig_proc*1986319864PUBLICvoidsig_proc(rmp,signo)19865registerstructmproc*rmp;/*pointertotheprocesstobesignaled*/19866intsigno;/*signaltosendtoprocess(1to_NSIG)*/19867{19868/*Sendasignaltoaprocess.
Checktoseeifthesignalistobecaught,19869*ignored,tranformedintoamessage(forsystemprocesses)orblocked.
19870*-Ifthesignalistobetransformedintoamessage,requesttheKERNELto19871*sendthetargetprocessasystemnotificationwiththependingsignalasan19872*argument.
19873*-Ifthesignalistobecaught,requesttheKERNELtopushasigcontext19874*structureandasigframestructureontothecatcher'sstack.
Also,KERNEL19875*willresettheprogramcounterandstackpointer,sothatwhentheprocess19876*nextruns,itwillbeexecutingthesignalhandler.
Whenthesignalhandler19877*returns,sigreturn(2)willbecalled.
ThenKERNELwillrestorethesignal19878*contextfromthesigcontextstructure.
19879*Ifthereisinsufficientstackspace,killtheprocess.
19880*/1988119882vir_bytesnew_sp;19883ints;19884intslot;19885intsigflags;19886structsigmsgsm;1988719888slot=(int)(rmp-mproc);19889if((rmp->mp_flags&(IN_USE|ZOMBIE))!
=IN_USE){19890printf("PM:signal%dsentto%sprocess%d\n",19891signo,(rmp->mp_flags&ZOMBIE)"zombie":"dead",slot);19892panic(__FILE__,"",NO_NUM);19893}19894if((rmp->mp_flags&TRACED)&&signo!
=SIGKILL){19895/*Atracedprocesshasspecialhandling.
*/19896unpause(slot);19897stop_proc(rmp,signo);/*asignalcausesittostop*/19898return;19899}19900/*Somesignalsareignoredbydefault.
*/19901if(sigismember(&rmp->mp_ignore,signo)){19902return;19903}19904if(sigismember(&rmp->mp_sigmask,signo)){19905/*Signalshouldbeblocked.
*/19906sigaddset(&rmp->mp_sigpending,signo);19907return;19908}19909sigflags=rmp->mp_sigact[signo].
sa_flags;19910if(sigismember(&rmp->mp_catch,signo)){19911if(rmp->mp_flags&SIGSUSPENDED)19912sm.
sm_mask=rmp->mp_sigmask2;19913else19914sm.
sm_mask=rmp->mp_sigmask;MINIXSOURCECODEFile:servers/pm/signal.
c76719915sm.
sm_signo=signo;19916sm.
sm_sighandler=(vir_bytes)rmp->mp_sigact[signo].
sa_handler;19917sm.
sm_sigreturn=rmp->mp_sigreturn;19918if((s=get_stack_ptr(slot,&new_sp))!
=OK)19919panic(__FILE__,"couldn'tgetnewstackpointer",s);19920sm.
sm_stkptr=new_sp;1992119922/*Makeroomforthesigcontextandsigframestruct.
*/19923new_sp-=sizeof(structsigcontext)19924+3*sizeof(char*)+2*sizeof(int);1992519926if(adjust(rmp,rmp->mp_seg[D].
mem_len,new_sp)!
=OK)19927gotodoterminate;1992819929rmp->mp_sigmask|=rmp->mp_sigact[signo].
sa_mask;19930if(sigflags&SA_NODEFER)19931sigdelset(&rmp->mp_sigmask,signo);19932else19933sigaddset(&rmp->mp_sigmask,signo);1993419935if(sigflags&SA_RESETHAND){19936sigdelset(&rmp->mp_catch,signo);19937rmp->mp_sigact[signo].
sa_handler=SIG_DFL;19938}1993919940if(OK==(s=sys_sigsend(slot,&sm))){1994119942sigdelset(&rmp->mp_sigpending,signo);19943/*IfprocessishangingonPAUSE,WAIT,SIGSUSPEND,tty,19944*pipe,etc.
,releaseit.
19945*/19946unpause(slot);19947return;19948}19949panic(__FILE__,"warning,sys_sigsendfailed",s);19950}19951elseif(sigismember(&rmp->mp_sig2mess,signo)){19952if(OK!
=(s=sys_kill(slot,signo)))19953panic(__FILE__,"warning,sys_killfailed",s);19954return;19955}1995619957doterminate:19958/*Signalshouldnotorcannotbecaught.
Takedefaultaction.
*/19959if(sigismember(&ign_sset,signo))return;1996019961rmp->mp_sigstatus=(char)signo;19962if(sigismember(&core_sset,signo)){19963/*Switchtotheuser'sFSenvironmentanddumpcore.
*/19964tell_fs(CHDIR,slot,FALSE,0);19965dump_core(rmp);19966}19967pm_exit(rmp,0);/*terminateprocess*/19968}1997019971*check_sig*1997219973PUBLICintcheck_sig(proc_id,signo)19974pid_tproc_id;/*pidofproctosig,or0or-1,or-pgrp*/768File:servers/pm/signal.
cMINIXSOURCECODE19975intsigno;/*signaltosendtoprocess(0to_NSIG)*/19976{19977/*Checktoseeifitispossibletosendasignal.
Thesignalmayhavetobe19978*senttoagroupofprocesses.
ThisroutineisinvokedbytheKILLsystem19979*call,andalsowhenthekernelcatchesaDELorothersignal.
19980*/1998119982registerstructmproc*rmp;19983intcount;/*count#ofsignalssent*/19984interror_code;1998519986if(signo_NSIG)return(EINVAL);1998719988/*ReturnEINVALforattemptstosendSIGKILLtoINITalone.
*/19989if(proc_id==INIT_PID&&signo==SIGKILL)return(EINVAL);1999019991/*Searchtheproctableforprocessestosignal.
(Seeforkexit.
cabout19992*pidmagic.
)19993*/19994count=0;19995error_code=ESRCH;19996for(rmp=&mproc[0];rmpmp_flags&IN_USE))continue;19998if((rmp->mp_flags&ZOMBIE)&&signo!
=0)continue;1999920000/*Checkforselection.
*/20001if(proc_id>0&&proc_id!
=rmp->mp_pid)continue;20002if(proc_id==0&&mp->mp_procgrp!
=rmp->mp_procgrp)continue;20003if(proc_id==-1&&rmp->mp_pidmp_procgrp!
=-proc_id)continue;2000520006/*Checkforpermission.
*/20007if(mp->mp_effuid!
=SUPER_USER20008&&mp->mp_realuid!
=rmp->mp_realuid20009&&mp->mp_effuid!
=rmp->mp_realuid20010&&mp->mp_realuid!
=rmp->mp_effuid20011&&mp->mp_effuid!
=rmp->mp_effuid){20012error_code=EPERM;20013continue;20014}2001520016count++;20017if(signo==0)continue;2001820019/*'sig_proc'willhandlethedispositionofthesignal.
The20020*signalmaybecaught,blocked,ignored,orcauseprocess20021*termination,possiblywithcoredump.
20022*/20023sig_proc(rmp,signo);2002420025if(proc_id>0)break;/*onlyoneprocessbeingsignaled*/20026}2002720028/*Ifthecallingprocesshaskilleditself,don'treply.
*/20029if((mp->mp_flags&(IN_USE|ZOMBIE))!
=IN_USE)return(SUSPEND);20030return(count>0OK:error_code);20031}MINIXSOURCECODEFile:servers/pm/signal.
c7692003320034*check_pending*2003520036PUBLICvoidcheck_pending(rmp)20037registerstructmproc*rmp;20038{20039/*Checktoseeifanypendingsignalshavebeenunblocked.
The20040*firstsuchsignalfoundisdelivered.
20041*20042*Ifmultiplependingunmaskedsignalsarefound,theywillbe20043*deliveredsequentially.
20044*20045*Thereareseveralplacesinthisfilewherethesignalmaskis20046*changed.
Ateachsuchplace,check_pending()shouldbecalledto20047*checkfornewlyunblockedsignals.
20048*/2004920050inti;2005120052for(i=1;imp_sigpending,i)&&20054!
sigismember(&rmp->mp_sigmask,i)){20055sigdelset(&rmp->mp_sigpending,i);20056sig_proc(rmp,i);20057break;20058}20059}20060}2006220063*unpause*2006420065PRIVATEvoidunpause(pro)20066intpro;/*whichprocessnumber*/20067{20068/*Asignalistobesenttoaprocess.
Ifthatprocessishangingona20069*systemcall,thesystemcallmustbeterminatedwithEINTR.
Possible20070*callsarePAUSE,WAIT,READandWRITE,thelattertwoforpipesandttys.
20071*FirstcheckiftheprocessishangingonanPMcall.
Ifnot,tellFS,20072*soitcancheckforREADsandWRITEsfrompipes,ttysandthelike.
20073*/2007420075registerstructmproc*rmp;2007620077rmp=&mproc[pro];2007820079/*ChecktoseeifprocessishangingonaPAUSE,WAITorSIGSUSPENDcall.
*/20080if(rmp->mp_flags&(PAUSED|WAITING|SIGSUSPENDED)){20081rmp->mp_flags&=(PAUSED|WAITING|SIGSUSPENDED);20082setreply(pro,EINTR);20083return;20084}2008520086/*ProcessisnothangingonanPMcall.
AskFStotakealook.
*/20087tell_fs(UNPAUSE,pro,0,0);20088}770File:servers/pm/signal.
cMINIXSOURCECODE2009020091*dump_core*2009220093PRIVATEvoiddump_core(rmp)20094registerstructmproc*rmp;/*whosecoreistobedumped*/20095{20096/*Makeacoredumponthefile"core",ifpossible.
*/2009720098ints,fd,seg,slot;20099vir_bytescurrent_sp;20100longtrace_data,trace_off;2010120102slot=(int)(rmp-mproc);2010320104/*CancorefilebewrittenWeareoperatingintheuser'sFSenvironment,20105*sonospecialpermissionchecksareneeded.
20106*/20107if(rmp->mp_realuid!
=rmp->mp_effuid)return;20108if((fd=open(core_name,O_WRONLY|O_CREAT|O_TRUNC|O_NONBLOCK,20109CORE_MODE))mp_sigstatus|=DUMPED;2011120112/*Makesurethestacksegmentisuptodate.
20113*Wedon'twantadjust()tofailunlesscurrent_spispreposterous,20114*butitmightfailduetosafetychecking.
Also,wedon'treallywant20115*theadjust()forsendingasignaltofailduetosafetychecking.
20116*MaybemakeSAFETY_BYTESaparameter.
20117*/20118if((s=get_stack_ptr(slot,¤t_sp))!
=OK)20119panic(__FILE__,"couldn'tgetnewstackpointer",s);20120adjust(rmp,rmp->mp_seg[D].
mem_len,current_sp);2012120122/*Writethememorymapofallsegmentstobeginthecorefile.
*/20123if(write(fd,(char*)rmp->mp_seg,(unsigned)sizeofrmp->mp_seg)20124!
=(unsigned)sizeofrmp->mp_seg){20125close(fd);20126return;20127}2012820129/*Writeoutthewholekernelprocesstableentrytogettheregs.
*/20130trace_off=0;20131while(sys_trace(T_GETUSER,slot,trace_off,&trace_data)==OK){20132if(write(fd,(char*)&trace_data,(unsigned)sizeof(long))20133!
=(unsigned)sizeof(long)){20134close(fd);20135return;20136}20137trace_off+=sizeof(long);20138}2013920140/*Loopthroughsegmentsandwritethesegmentsthemselvesout.
*/20141for(seg=0;segmp_seg[seg].
mem_len20218#include20219#include2022020221PRIVATEtimer_t*pm_timers=NULL;202222022320224*pm_set_timer*2022520226PUBLICvoidpm_set_timer(timer_t*tp,intticks,tmr_func_twatchdog,intarg)20227{20228intr;20229clock_tnow,prev_time=0,next_time;2023020231if((r=getuptime(&now))!
=OK)20232panic(__FILE__,"PMcouldn'tgetuptime",NO_NUM);2023320234/*Settimerargumentandaddtimertothelist.
*/20235tmr_arg(tp)->ta_int=arg;20236prev_time=tmrs_settimer(&pm_timers,tp,now+ticks,watchdog,&next_time);2023720238/*Rescheduleoursynchronousalarmifnecessary.
*/20239if(!
prev_time||prev_time>next_time){20240if(sys_setalarm(next_time,1)!
=OK)20241panic(__FILE__,"PMsettimercouldn'tsetalarm.
",NO_NUM);20242}2024320244return;20245}2024720248*pm_expire_timers*2024920250PUBLICvoidpm_expire_timers(clock_tnow)20251{20252clock_tnext_time;2025320254/*Checkforexpiredtimersandpossiblyrescheduleanalarm.
*/772File:servers/pm/timers.
cMINIXSOURCECODE20255tmrs_exptimers(&pm_timers,now,&next_time);20256if(next_time>0){20257if(sys_setalarm(next_time,1)!
=OK)20258panic(__FILE__,"PMexpiretimercouldn'tsetalarm.
",NO_NUM);20259}20260}2026220263*pm_cancel_timer*2026420265PUBLICvoidpm_cancel_timer(timer_t*tp)20266{20267clock_tnext_time,prev_time;20268prev_time=tmrs_clrtimer(&pm_timers,tp,&next_time);2026920270/*Iftheearliesttimerhasbeenremoved,wehavetosetthealarmto20271*thenexttimer,orcancelthealarmaltogetherifthelasttimerhas20272*beencancelled(next_timewillbe0then).
20273*/20274if(prev_time20310#include20311#include20312#include"mproc.
h"20313#include"param.
h"2031420315PRIVATEtime_tboottime;203162031720318*do_time*2031920320PUBLICintdo_time()20321{20322/*Performthetime(tp)systemcall.
Thisreturnsthetimeinsecondssince20323*1.
1.
1970.
MINIXisanastrophysicallynaivesystemthatassumestheearth20324*rotatesataconstantrateandthatsuchthingsasleapsecondsdonot20325*exist.
20326*/20327clock_tuptime;20328ints;20329MINIXSOURCECODEFile:servers/pm/time.
c77320330if((s=getuptime(&uptime))!
=OK)20331panic(__FILE__,"do_timecouldn'tgetuptime",s);2033220333mp->mp_reply.
reply_time=(time_t)(boottime+(uptime/HZ));20334mp->mp_reply.
reply_utime=(uptime%HZ)*1000000/HZ;20335return(OK);20336}2033820339*do_stime*2034020341PUBLICintdo_stime()20342{20343/*Performthestime(tp)systemcall.
Retrievethesystem'suptime(ticks20344*sinceboot)andstorethetimeinsecondsatsystembootintheglobal20345*variable'boottime'.
20346*/20347clock_tuptime;20348ints;2034920350if(mp->mp_effuid!
=SUPER_USER){20351return(EPERM);20352}20353if((s=getuptime(&uptime))!
=OK)20354panic(__FILE__,"do_stimecouldn'tgetuptime",s);20355boottime=(long)m_in.
stime-(uptime/HZ);2035620357/*AlsoinformFSaboutthenewsystemtime.
*/20358tell_fs(STIME,boottime,0,0);2035920360return(OK);20361}2036320364*do_times*2036520366PUBLICintdo_times()20367{20368/*Performthetimes(buffer)systemcall.
*/20369registerstructmproc*rmp=mp;20370clock_tt[5];20371ints;2037220373if(OK!
=(s=sys_times(who,t)))20374panic(__FILE__,"do_timescouldn'tgettimes",s);20375rmp->mp_reply.
reply_t1=t[0];/*usertime*/20376rmp->mp_reply.
reply_t2=t[1];/*systemtime*/20377rmp->mp_reply.
reply_t3=rmp->mp_child_utime;/*childusertime*/20378rmp->mp_reply.
reply_t4=rmp->mp_child_stime;/*childsystemtime*/20379rmp->mp_reply.
reply_t5=t[4];/*uptimesinceboot*/2038020381return(OK);20382}774File:servers/pm/getset.
cMINIXSOURCECODEservers/pm/getset.
c20400/*Thisfilehandlesthe4systemcallsthatgetandsetuidsandgids.
20401*Italsohandlesgetpid(),setsid(),andgetpgrp().
Thecodeforeach20402*oneissotinythatithardlyseemedworthwhiletomakeeachaseparate20403*function.
20404*/2040520406#include"pm.
h"20407#include20408#include20409#include"mproc.
h"20410#include"param.
h"204112041220413*do_getset*2041420415PUBLICintdo_getset()20416{20417/*HandleGETUID,GETGID,GETPID,GETPGRP,SETUID,SETGID,SETSID.
Thefour20418*GETsandSETSIDreturntheirprimaryresultsin'r'.
GETUID,GETGID,and20419*GETPIDalsoreturnsecondaryresults(theeffectiveIDs,ortheparent20420*processID)in'reply_res2',whichisreturnedtotheuser.
20421*/2042220423registerstructmproc*rmp=mp;20424registerintr;2042520426switch(call_nr){20427caseGETUID:20428r=rmp->mp_realuid;20429rmp->mp_reply.
reply_res2=rmp->mp_effuid;20430break;2043120432caseGETGID:20433r=rmp->mp_realgid;20434rmp->mp_reply.
reply_res2=rmp->mp_effgid;20435break;2043620437caseGETPID:20438r=mproc[who].
mp_pid;20439rmp->mp_reply.
reply_res2=mproc[rmp->mp_parent].
mp_pid;20440break;2044120442caseSETUID:20443if(rmp->mp_realuid!
=(uid_t)m_in.
usr_id&&20444rmp->mp_effuid!
=SUPER_USER)20445return(EPERM);20446rmp->mp_realuid=(uid_t)m_in.
usr_id;20447rmp->mp_effuid=(uid_t)m_in.
usr_id;20448tell_fs(SETUID,who,rmp->mp_realuid,rmp->mp_effuid);20449r=OK;20450break;2045120452caseSETGID:20453if(rmp->mp_realgid!
=(gid_t)m_in.
grp_id&&20454rmp->mp_effuid!
=SUPER_USER)MINIXSOURCECODEFile:servers/pm/getset.
c77520455return(EPERM);20456rmp->mp_realgid=(gid_t)m_in.
grp_id;20457rmp->mp_effgid=(gid_t)m_in.
grp_id;20458tell_fs(SETGID,who,rmp->mp_realgid,rmp->mp_effgid);20459r=OK;20460break;2046120462caseSETSID:20463if(rmp->mp_procgrp==rmp->mp_pid)return(EPERM);20464rmp->mp_procgrp=rmp->mp_pid;20465tell_fs(SETSID,who,0,0);20466/*fallthrough*/2046720468caseGETPGRP:20469r=rmp->mp_procgrp;20470break;2047120472default:20473r=EINVAL;20474break;20475}20476return(r);20477}servers/pm/misc.
c20500/*Miscellaneoussystemcalls.
Author:KeesJ.
Bot20501*31Mar200020502*Theentrypointsintothisfileare:20503*do_reboot:killallprocesses,thenrebootsystem20504*do_svrctl:processmanagercontrol20505*do_getsysinfo:requestcopyofPMdatastructure(JorritN.
Herder)20506*do_getprocnr:lookupprocessslotnumber(JorritN.
Herder)20507*do_memalloc:allocateachunkofmemory(JorritN.
Herder)20508*do_memfree:deallocateachunkofmemory(JorritN.
Herder)20509*do_getsetpriority:get/setprocesspriority20510*/2051120512#include"pm.
h"20513#include20514#include20515#include20516#include20517#include20518#include20519#include"mproc.
h"20520#include"param.
h"205212052220523*do_allocmem*2052420525PUBLICintdo_allocmem()20526{20527vir_clicksmem_clicks;20528phys_clicksmem_base;20529776File:servers/pm/misc.
cMINIXSOURCECODE20530mem_clicks=(m_in.
memsize+CLICK_SIZE-1)>>CLICK_SHIFT;20531mem_base=alloc_mem(mem_clicks);20532if(mem_base==NO_MEM)return(ENOMEM);20533mp->mp_reply.
membase=(phys_bytes)(mem_base>CLICK_SHIFT;20546mem_base=(m_in.
membase+CLICK_SIZE-1)>>CLICK_SHIFT;20547free_mem(mem_base,mem_clicks);20548return(OK);20549}2055120552*do_getsysinfo*2055320554PUBLICintdo_getsysinfo()20555{20556structmproc*proc_addr;20557vir_bytessrc_addr,dst_addr;20558structkinfokinfo;20559size_tlen;20560ints;2056120562switch(m_in.
info_what){20563caseSI_KINFO:/*kernelinfoisobtainedviaPM*/20564sys_getkinfo(&kinfo);20565src_addr=(vir_bytes)&kinfo;20566len=sizeof(structkinfo);20567break;20568caseSI_PROC_ADDR:/*getaddressofPMprocesstable*/20569proc_addr=&mproc[0];20570src_addr=(vir_bytes)&proc_addr;20571len=sizeof(structmproc*);20572break;20573caseSI_PROC_TAB:/*copyentireprocesstable*/20574src_addr=(vir_bytes)mproc;20575len=sizeof(structmproc)*NR_PROCS;20576break;20577default:20578return(EINVAL);20579}2058020581dst_addr=(vir_bytes)m_in.
info_where;20582if(OK!
=(s=sys_datacopy(SELF,src_addr,who,dst_addr,len)))20583return(s);20584return(OK);20585}MINIXSOURCECODEFile:servers/pm/misc.
c7772058720588*do_getprocnr*2058920590PUBLICintdo_getprocnr()20591{20592registerstructmproc*rmp;20593staticcharsearch_key[PROC_NAME_LEN+1];20594intkey_len;20595ints;2059620597if(m_in.
pid>=0){/*lookupprocessbypid*/20598for(rmp=&mproc[0];rmpmp_flags&IN_USE)&&(rmp->mp_pid==m_in.
pid)){20600mp->mp_reply.
procnr=(int)(rmp-mproc);20601return(OK);20602}20603}20604return(ESRCH);20605}elseif(m_in.
namelen>0){/*lookupprocessbyname*/20606key_len=MIN(m_in.
namelen,PROC_NAME_LEN);20607if(OK!
=(s=sys_datacopy(who,(vir_bytes)m_in.
addr,20608SELF,(vir_bytes)search_key,key_len)))20609return(s);20610search_key[key_len]='\0';/*terminateforsafety*/20611for(rmp=&mproc[0];rmpmp_flags&IN_USE)&&20613strncmp(rmp->mp_name,search_key,key_len)==0){20614mp->mp_reply.
procnr=(int)(rmp-mproc);20615return(OK);20616}20617}20618return(ESRCH);20619}else{/*returnownprocessnumber*/20620mp->mp_reply.
procnr=who;20621}20622return(OK);20623}2062520626*do_reboot*2062720628#defineREBOOT_CODE"delay;boot"20629PUBLICintdo_reboot()20630{20631charmonitor_code[32*sizeof(char*)];20632intcode_len;20633intabort_flag;2063420635if(mp->mp_effuid!
=SUPER_USER)return(EPERM);2063620637switch(m_in.
reboot_flag){20638caseRBT_HALT:20639caseRBT_PANIC:20640caseRBT_RESET:20641abort_flag=m_in.
reboot_flag;20642break;20643caseRBT_REBOOT:20644code_len=strlen(REBOOT_CODE)+1;20645strncpy(monitor_code,REBOOT_CODE,code_len);20646abort_flag=RBT_MONITOR;778File:servers/pm/misc.
cMINIXSOURCECODE20647break;20648caseRBT_MONITOR:20649code_len=m_in.
reboot_strlen+1;20650if(code_len>sizeof(monitor_code))return(EINVAL);20651if(sys_datacopy(who,(vir_bytes)m_in.
reboot_code,20652PM_PROC_NR,(vir_bytes)monitor_code,20653(phys_bytes)(code_len))!
=OK)return(EFAULT);20654if(monitor_code[code_len-1]!
=0)return(EINVAL);20655abort_flag=RBT_MONITOR;20656break;20657default:20658return(EINVAL);20659}2066020661check_sig(-1,SIGKILL);/*killallprocessesexceptinit*/20662tell_fs(REBOOT,0,0,0);/*tellFStoprepareforshutdown*/2066320664/*Askthekerneltoabort.
Allsystemservices,includingthePM,will20665*getaHARD_STOPnotification.
Awaitthenotificationinthemainloop.
20666*/20667sys_abort(abort_flag,PM_PROC_NR,monitor_code,code_len);20668return(SUSPEND);/*don'treplytokilledprocess*/20669}2067120672*do_getsetpriority*2067320674PUBLICintdo_getsetpriority()20675{20676intarg_which,arg_who,arg_pri;20677intrmp_nr;20678structmproc*rmp;2067920680arg_which=m_in.
m1_i1;20681arg_who=m_in.
m1_i2;20682arg_pri=m_in.
m1_i3;/*forSETPRIORITY*/2068320684/*CodecommontoGETPRIORITYandSETPRIORITY.
*/2068520686/*OnlysupportPRIO_PROCESSfornow.
*/20687if(arg_which!
=PRIO_PROCESS)20688return(EINVAL);2068920690if(arg_who==0)20691rmp_nr=who;20692else20693if((rmp_nr=proc_from_pid(arg_who))mp_effuid!
=SUPER_USER&&20699mp->mp_effuid!
=rmp->mp_effuid&&mp->mp_effuid!
=rmp->mp_realuid)20700returnEPERM;2070120702/*IfGET,that'sit.
*/20703if(call_nr==GETPRIORITY){20704return(rmp->mp_nice-PRIO_MIN);20705}20706MINIXSOURCECODEFile:servers/pm/misc.
c77920707/*Onlyrootisallowedtoreducethenicelevel.
*/20708if(rmp->mp_nice>arg_pri&&mp->mp_effuid!
=SUPER_USER)20709return(EACCES);2071020711/*We'reSET,andit'sallowed.
Doitandtellkernel.
*/20712rmp->mp_nice=arg_pri;20713returnsys_nice(rmp_nr,arg_pri);20714}2071620717*do_svrctl*2071820719PUBLICintdo_svrctl()20720{20721ints,req;20722vir_bytesptr;20723#defineMAX_LOCAL_PARAMS220724staticstruct{20725charname[30];20726charvalue[30];20727}local_param_overrides[MAX_LOCAL_PARAMS];20728staticintlocal_params=0;2072920730req=m_in.
svrctl_req;20731ptr=(vir_bytes)m_in.
svrctl_argp;2073220733/*IstherequestindeedfortheMM*/20734if(((req>>8)&0xFF)!
='M')return(EINVAL);2073520736/*ControloperationslocaltothePM.
*/20737switch(req){20738caseMMSETPARAM:20739caseMMGETPARAM:{20740structsysgetenvsysgetenv;20741charsearch_key[64];20742char*val_start;20743size_tval_len;20744size_tcopy_len;2074520746/*CopysysgetenvstructuretoPM.
*/20747if(sys_datacopy(who,ptr,SELF,(vir_bytes)&sysgetenv,20748sizeof(sysgetenv))!
=OK)return(EFAULT);2074920750/*Setaparamoverride*/20751if(req==MMSETPARAM){20752if(local_params>=MAX_LOCAL_PARAMS)returnENOSPC;20753if(sysgetenv.
keylen=20755sizeof(local_param_overrides[local_params].
name)20756||sysgetenv.
vallen=20758sizeof(local_param_overrides[local_params].
value))20759returnEINVAL;2076020761if((s=sys_datacopy(who,(vir_bytes)sysgetenv.
key,20762SELF,(vir_bytes)local_param_overrides[local_params].
name,20763sysgetenv.
keylen))!
=OK)20764returns;20765if((s=sys_datacopy(who,(vir_bytes)sysgetenv.
val,20766SELF,(vir_bytes)local_param_overrides[local_params].
value,780File:servers/pm/misc.
cMINIXSOURCECODE20767sysgetenv.
keylen))!
=OK)20768returns;20769local_param_overrides[local_params].
name[sysgetenv.
keylen]='\0';20770local_param_overrides[local_params].
value[sysgetenv.
vallen]='\0';2077120772local_params++;2077320774returnOK;20775}2077620777if(sysgetenv.
keylen==0){/*copyallparameters*/20778val_start=monitor_params;20779val_len=sizeof(monitor_params);20780}20781else{/*lookupvalueforkey*/20782intp;20783/*Trytogetacopyoftherequestedkey.
*/20784if(sysgetenv.
keylen>sizeof(search_key))return(EINVAL);20785if((s=sys_datacopy(who,(vir_bytes)sysgetenv.
key,20786SELF,(vir_bytes)search_key,sysgetenv.
keylen))!
=OK)20787return(s);2078820789/*Makesurekeyisnull-terminatedandlookupvalue.
20790*Firstchecklocaloverrides.
20791*/20792search_key[sysgetenv.
keylen-1]='\0';20793for(p=0;p=local_params&&(val_start=find_param(search_key))==NULL)20800return(ESRCH);20801val_len=strlen(val_start)+1;20802}2080320804/*Seeifitfitsintheclient'sbuffer.
*/20805if(val_len>sysgetenv.
vallen)20806returnE2BIG;2080720808/*Valuefound,maketheactualcopy(asfaraspossible).
*/20809copy_len=MIN(val_len,sysgetenv.
vallen);20810if((s=sys_datacopy(SELF,(vir_bytes)val_start,20811who,(vir_bytes)sysgetenv.
val,copy_len))!
=OK)20812return(s);2081320814returnOK;20815}20816default:20817return(EINVAL);20818}20819}MINIXSOURCECODEFile:servers/fs/fs.
h781servers/fs/fs.
h20900/*Thisisthemasterheaderforfs.
Itincludessomeotherfiles20901*anddefinestheprincipalconstants.
20902*/20903#define_POSIX_SOURCE1/*tellheaderstoincludePOSIXstuff*/20904#define_MINIX1/*tellheaderstoincludeMINIXstuff*/20905#define_SYSTEM1/*tellheadersthatthisisthekernel*/2090620907#defineVERBOSE0/*showmessagesduringinitialization*/2090820909/*Thefollowingaresobasic,allthe*.
cfilesgetthemautomatically.
*/20910#include/*MUSTbefirst*/20911#include/*MUSTbesecond*/20912#include20913#include20914#include20915#include2091620917#include20918#include2091920920#include20921#include2092220923#include"const.
h"20924#include"type.
h"20925#include"proto.
h"20926#include"glo.
h"servers/fs/const.
h21000/*Tablessizes*/21001#defineV1_NR_DZONES7/*#directzonenumbersinaV1inode*/21002#defineV1_NR_TZONES9/*total#zonenumbersinaV1inode*/21003#defineV2_NR_DZONES7/*#directzonenumbersinaV2inode*/21004#defineV2_NR_TZONES10/*total#zonenumbersinaV2inode*/2100521006#defineNR_FILPS128/*#slotsinfilptable*/21007#defineNR_INODES64/*#slotsin"incore"inodetable*/21008#defineNR_SUPERS8/*#slotsinsuperblocktable*/21009#defineNR_LOCKS8/*#slotsinthefilelockingtable*/2101021011/*Thetypeofsizeofmaybe(unsigned)long.
Usethefollowingmacrofor21012*takingthesizesofsmallobjectssothattherearenosurpriseslike21013*(small)longconstantsbeingpassedtoroutinesexpectinganint.
21014*/21015#defineusizeof(t)((unsigned)sizeof(t))2101621017/*Filesystemtypes.
*/21018#defineSUPER_MAGIC0x137F/*magicnumbercontainedinsuper-block*/21019#defineSUPER_REV0x7F13/*magic#when68000diskreadonPCorvv*/782File:servers/fs/const.
hMINIXSOURCECODE21020#defineSUPER_V20x2468/*magic#forV2filesystems*/21021#defineSUPER_V2_REV0x6824/*V2magicwrittenonPC,readon68Korvv*/21022#defineSUPER_V30x4d5a/*magic#forV3filesystems*/2102321024#defineV11/*versionnumberofV1filesystems*/21025#defineV22/*versionnumberofV2filesystems*/21026#defineV33/*versionnumberofV3filesystems*/2102721028/*Miscellaneousconstants*/21029#defineSU_UID((uid_t)0)/*super_user'suid_t*/21030#defineSYS_UID((uid_t)0)/*uid_tforprocessesMMandINIT*/21031#defineSYS_GID((gid_t)0)/*gid_tforprocessesMMandINIT*/21032#defineNORMAL0/*forcesget_blocktododiskread*/21033#defineNO_READ1/*preventsget_blockfromdoingdiskread*/21034#definePREFETCH2/*tellsget_blocknottoreadormarkdev*/2103521036#defineXPIPE(-NR_TASKS-1)/*usedinfp_taskwhensusp'donpipe*/21037#defineXLOCK(-NR_TASKS-2)/*usedinfp_taskwhensusp'donlock*/21038#defineXPOPEN(-NR_TASKS-3)/*usedinfp_taskwhensusp'donpipeopen*/21039#defineXSELECT(-NR_TASKS-4)/*usedinfp_taskwhensusp'donselect*/2104021041#defineNO_BIT((bit_t)0)/*returnedbyalloc_bit()tosignalfailure*/2104221043#defineDUP_MASK0100/*masktodistinguishdup2fromdup*/2104421045#defineLOOK_UP0/*tellssearch_dirtolookupstring*/21046#defineENTER1/*tellssearch_dirtomakedirentry*/21047#defineDELETE2/*tellssearch_dirtodeleteentry*/21048#defineIS_EMPTY3/*tellssearch_dirtoret.
OKorENOTEMPTY*/2104921050#defineCLEAN0/*diskandmemorycopiesidentical*/21051#defineDIRTY1/*diskandmemorycopiesdiffer*/21052#defineATIME002/*setifatimefieldneedsupdating*/21053#defineCTIME004/*setifctimefieldneedsupdating*/21054#defineMTIME010/*setifmtimefieldneedsupdating*/2105521056#defineBYTE_SWAP0/*tellsconv2/conv4toswapbytes*/2105721058#defineEND_OF_FILE(-104)/*eofdetected*/2105921060#defineROOT_INODE1/*inodenumberforrootdirectory*/21061#defineBOOT_BLOCK((block_t)0)/*blocknumberofbootblock*/21062#defineSUPER_BLOCK_BYTES(1024)/*bytesoffset*/21063#defineSTART_BLOCK2/*firstblockofFS(notcountingSB)*/2106421065#defineDIR_ENTRY_SIZEusizeof(structdirect)/*#bytes/direntry*/21066#defineNR_DIR_ENTRIES(b)((b)/DIR_ENTRY_SIZE)/*#direntries/blk*/21067#defineSUPER_SIZEusizeof(structsuper_block)/*super_blocksize*/21068#definePIPE_SIZE(b)(V1_NR_DZONES*(b))/*pipesizeinbytes*/2106921070#defineFS_BITMAP_CHUNKS(b)((b)/usizeof(bitchunk_t))/*#mapchunks/blk*/21071#defineFS_BITCHUNK_BITS(usizeof(bitchunk_t)*CHAR_BIT)21072#defineFS_BITS_PER_BLOCK(b)(FS_BITMAP_CHUNKS(b)*FS_BITCHUNK_BITS)2107321074/*DerivedsizespertainingtotheV1filesystem.
*/21075#defineV1_ZONE_NUM_SIZEusizeof(zone1_t)/*#bytesinV1zone*/21076#defineV1_INODE_SIZEusizeof(d1_inode)/*bytesinV1dskino*/2107721078/*#zones/indirblock*/21079#defineV1_INDIRECTS(STATIC_BLOCK_SIZE/V1_ZONE_NUM_SIZE)MINIXSOURCECODEFile:servers/fs/const.
h7832108021081/*#V1dskinodes/blk*/21082#defineV1_INODES_PER_BLOCK(STATIC_BLOCK_SIZE/V1_INODE_SIZE)2108321084/*DerivedsizespertainingtotheV2filesystem.
*/21085#defineV2_ZONE_NUM_SIZEusizeof(zone_t)/*#bytesinV2zone*/21086#defineV2_INODE_SIZEusizeof(d2_inode)/*bytesinV2dskino*/21087#defineV2_INDIRECTS(b)((b)/V2_ZONE_NUM_SIZE)/*#zones/indirblock*/21088#defineV2_INODES_PER_BLOCK(b)((b)/V2_INODE_SIZE)/*#V2dskinodes/blk*/servers/fs/type.
h21100/*DeclarationoftheV1inodeasitisonthedisk(notincore).
*/21101typedefstruct{/*V1.
xdiskinode*/21102mode_td1_mode;/*filetype,protection,etc.
*/21103uid_td1_uid;/*useridofthefile'sowner*/21104off_td1_size;/*currentfilesizeinbytes*/21105time_td1_mtime;/*whenwasfiledatalastchanged*/21106u8_td1_gid;/*groupnumber*/21107u8_td1_nlinks;/*howmanylinkstothisfile*/21108u16_td1_zone[V1_NR_TZONES];/*blocknumsfordirect,ind,anddblind*/21109}d1_inode;2111021111/*DeclarationoftheV2inodeasitisonthedisk(notincore).
*/21112typedefstruct{/*V2.
xdiskinode*/21113mode_td2_mode;/*filetype,protection,etc.
*/21114u16_td2_nlinks;/*howmanylinkstothisfile.
HACK!
*/21115uid_td2_uid;/*useridofthefile'sowner.
*/21116u16_td2_gid;/*groupnumberHACK!
*/21117off_td2_size;/*currentfilesizeinbytes*/21118time_td2_atime;/*whenwasfiledatalastaccessed*/21119time_td2_mtime;/*whenwasfiledatalastchanged*/21120time_td2_ctime;/*whenwasinodedatalastchanged*/21121zone_td2_zone[V2_NR_TZONES];/*blocknumsfordirect,ind,anddblind*/21122}d2_inode;servers/fs/proto.
h21200/*Functionprototypes.
*/2120121202#include"timers.
h"2120321204/*Structsusedinprototypesmustbedeclaredassuchfirst.
*/21205structbuf;21206structfilp;21207structinode;21208structsuper_block;2120921210/*cache.
c*/21211_PROTOTYPE(zone_talloc_zone,(Dev_tdev,zone_tz));21212_PROTOTYPE(voidflushall,(Dev_tdev));21213_PROTOTYPE(voidfree_zone,(Dev_tdev,zone_tnumb));21214_PROTOTYPE(structbuf*get_block,(Dev_tdev,block_tblock,intonly_search));784File:servers/fs/proto.
hMINIXSOURCECODE21215_PROTOTYPE(voidinvalidate,(Dev_tdevice));21216_PROTOTYPE(voidput_block,(structbuf*bp,intblock_type));21217_PROTOTYPE(voidrw_block,(structbuf*bp,intrw_flag));21218_PROTOTYPE(voidrw_scattered,(Dev_tdev,21219structbuf**bufq,intbufqsize,intrw_flag));2122021221/*device.
c*/21222_PROTOTYPE(intdev_open,(Dev_tdev,intproc,intflags));21223_PROTOTYPE(voiddev_close,(Dev_tdev));21224_PROTOTYPE(intdev_io,(intop,Dev_tdev,intproc,void*buf,21225off_tpos,intbytes,intflags));21226_PROTOTYPE(intgen_opcl,(intop,Dev_tdev,intproc,intflags));21227_PROTOTYPE(voidgen_io,(inttask_nr,message*mess_ptr));21228_PROTOTYPE(intno_dev,(intop,Dev_tdev,intproc,intflags));21229_PROTOTYPE(inttty_opcl,(intop,Dev_tdev,intproc,intflags));21230_PROTOTYPE(intctty_opcl,(intop,Dev_tdev,intproc,intflags));21231_PROTOTYPE(intclone_opcl,(intop,Dev_tdev,intproc,intflags));21232_PROTOTYPE(voidctty_io,(inttask_nr,message*mess_ptr));21233_PROTOTYPE(intdo_ioctl,(void));21234_PROTOTYPE(intdo_setsid,(void));21235_PROTOTYPE(voiddev_status,(message*));2123621237/*dmp.
c*/21238_PROTOTYPE(intdo_fkey_pressed,(void));2123921240/*dmap.
c*/21241_PROTOTYPE(intdo_devctl,(void));21242_PROTOTYPE(voidbuild_dmap,(void));21243_PROTOTYPE(intmap_driver,(intmajor,intproc_nr,intdev_style));2124421245/*filedes.
c*/21246_PROTOTYPE(structfilp*find_filp,(structinode*rip,mode_tbits));21247_PROTOTYPE(intget_fd,(intstart,mode_tbits,int*k,structfilp**fpt));21248_PROTOTYPE(structfilp*get_filp,(intfild));2124921250/*inode.
c*/21251_PROTOTYPE(structinode*alloc_inode,(dev_tdev,mode_tbits));21252_PROTOTYPE(voiddup_inode,(structinode*ip));21253_PROTOTYPE(voidfree_inode,(Dev_tdev,Ino_tnumb));21254_PROTOTYPE(structinode*get_inode,(Dev_tdev,intnumb));21255_PROTOTYPE(voidput_inode,(structinode*rip));21256_PROTOTYPE(voidupdate_times,(structinode*rip));21257_PROTOTYPE(voidrw_inode,(structinode*rip,intrw_flag));21258_PROTOTYPE(voidwipe_inode,(structinode*rip));2125921260/*link.
c*/21261_PROTOTYPE(intdo_link,(void));21262_PROTOTYPE(intdo_unlink,(void));21263_PROTOTYPE(intdo_rename,(void));21264_PROTOTYPE(voidtruncate,(structinode*rip));2126521266/*lock.
c*/21267_PROTOTYPE(intlock_op,(structfilp*f,intreq));21268_PROTOTYPE(voidlock_revive,(void));2126921270/*main.
c*/21271_PROTOTYPE(intmain,(void));21272_PROTOTYPE(voidreply,(intwhom,intresult));2127321274/*misc.
c*/MINIXSOURCECODEFile:servers/fs/proto.
h78521275_PROTOTYPE(intdo_dup,(void));21276_PROTOTYPE(intdo_exit,(void));21277_PROTOTYPE(intdo_fcntl,(void));21278_PROTOTYPE(intdo_fork,(void));21279_PROTOTYPE(intdo_exec,(void));21280_PROTOTYPE(intdo_revive,(void));21281_PROTOTYPE(intdo_set,(void));21282_PROTOTYPE(intdo_sync,(void));21283_PROTOTYPE(intdo_fsync,(void));21284_PROTOTYPE(intdo_reboot,(void));21285_PROTOTYPE(intdo_svrctl,(void));21286_PROTOTYPE(intdo_getsysinfo,(void));2128721288/*mount.
c*/21289_PROTOTYPE(intdo_mount,(void));21290_PROTOTYPE(intdo_umount,(void));21291_PROTOTYPE(intunmount,(Dev_tdev));2129221293/*open.
c*/21294_PROTOTYPE(intdo_close,(void));21295_PROTOTYPE(intdo_creat,(void));21296_PROTOTYPE(intdo_lseek,(void));21297_PROTOTYPE(intdo_mknod,(void));21298_PROTOTYPE(intdo_mkdir,(void));21299_PROTOTYPE(intdo_open,(void));2130021301/*path.
c*/21302_PROTOTYPE(structinode*advance,(structinode*dirp,charstring[NAME_MAX]));21303_PROTOTYPE(intsearch_dir,(structinode*ldir_ptr,21304charstring[NAME_MAX],ino_t*numb,intflag));21305_PROTOTYPE(structinode*eat_path,(char*path));21306_PROTOTYPE(structinode*last_dir,(char*path,charstring[NAME_MAX]));2130721308/*pipe.
c*/21309_PROTOTYPE(intdo_pipe,(void));21310_PROTOTYPE(intdo_unpause,(void));21311_PROTOTYPE(intpipe_check,(structinode*rip,intrw_flag,21312intoflags,intbytes,off_tposition,int*canwrite,intnotouch));21313_PROTOTYPE(voidrelease,(structinode*ip,intcall_nr,intcount));21314_PROTOTYPE(voidrevive,(intproc_nr,intbytes));21315_PROTOTYPE(voidsuspend,(inttask));21316_PROTOTYPE(intselect_request_pipe,(structfilp*f,int*ops,intbl));21317_PROTOTYPE(intselect_cancel_pipe,(structfilp*f));21318_PROTOTYPE(intselect_match_pipe,(structfilp*f));2131921320/*protect.
c*/21321_PROTOTYPE(intdo_access,(void));21322_PROTOTYPE(intdo_chmod,(void));21323_PROTOTYPE(intdo_chown,(void));21324_PROTOTYPE(intdo_umask,(void));21325_PROTOTYPE(intforbidden,(structinode*rip,mode_taccess_desired));21326_PROTOTYPE(intread_only,(structinode*ip));2132721328/*read.
c*/21329_PROTOTYPE(intdo_read,(void));21330_PROTOTYPE(structbuf*rahead,(structinode*rip,block_tbaseblock,21331off_tposition,unsignedbytes_ahead));21332_PROTOTYPE(voidread_ahead,(void));21333_PROTOTYPE(block_tread_map,(structinode*rip,off_tposition));21334_PROTOTYPE(intread_write,(intrw_flag));786File:servers/fs/proto.
hMINIXSOURCECODE21335_PROTOTYPE(zone_trd_indir,(structbuf*bp,intindex));2133621337/*stadir.
c*/21338_PROTOTYPE(intdo_chdir,(void));21339_PROTOTYPE(intdo_fchdir,(void));21340_PROTOTYPE(intdo_chroot,(void));21341_PROTOTYPE(intdo_fstat,(void));21342_PROTOTYPE(intdo_stat,(void));21343_PROTOTYPE(intdo_fstatfs,(void));2134421345/*super.
c*/21346_PROTOTYPE(bit_talloc_bit,(structsuper_block*sp,intmap,bit_torigin));21347_PROTOTYPE(voidfree_bit,(structsuper_block*sp,intmap,21348bit_tbit_returned));21349_PROTOTYPE(structsuper_block*get_super,(Dev_tdev));21350_PROTOTYPE(intmounted,(structinode*rip));21351_PROTOTYPE(intread_super,(structsuper_block*sp));21352_PROTOTYPE(intget_block_size,(dev_tdev));2135321354/*time.
c*/21355_PROTOTYPE(intdo_stime,(void));21356_PROTOTYPE(intdo_utime,(void));2135721358/*utility.
c*/21359_PROTOTYPE(time_tclock_time,(void));21360_PROTOTYPE(unsignedconv2,(intnorm,intw));21361_PROTOTYPE(longconv4,(intnorm,longx));21362_PROTOTYPE(intfetch_name,(char*path,intlen,intflag));21363_PROTOTYPE(intno_sys,(void));21364_PROTOTYPE(voidpanic,(char*who,char*mess,intnum));2136521366/*write.
c*/21367_PROTOTYPE(voidclear_zone,(structinode*rip,off_tpos,intflag));21368_PROTOTYPE(intdo_write,(void));21369_PROTOTYPE(structbuf*new_block,(structinode*rip,off_tposition));21370_PROTOTYPE(voidzero_block,(structbuf*bp));2137121372/*select.
c*/21373_PROTOTYPE(intdo_select,(void));21374_PROTOTYPE(intselect_callback,(structfilp*,intops));21375_PROTOTYPE(voidselect_forget,(intfproc));21376_PROTOTYPE(voidselect_timeout_check,(timer_t*));21377_PROTOTYPE(voidinit_select,(void));21378_PROTOTYPE(intselect_notified,(intmajor,intminor,intops));2137921380/*timers.
c*/21381_PROTOTYPE(voidfs_set_timer,(timer_t*tp,intdelta,tmr_func_twatchdog,intarg));21382_PROTOTYPE(voidfs_expire_timers,(clock_tnow));21383_PROTOTYPE(voidfs_cancel_timer,(timer_t*tp));21384_PROTOTYPE(voidfs_init_timer,(timer_t*tp));2138521386/*cdprobe.
c*/21387_PROTOTYPE(intcdprobe,(void));MINIXSOURCECODEFile:servers/fs/glo.
h787servers/fs/glo.
h21400/*EXTERNshouldbeexternexceptforthetablefile*/21401#ifdef_TABLE21402#undefEXTERN21403#defineEXTERN21404#endif2140521406/*FileSystemglobalvariables*/21407EXTERNstructfproc*fp;/*pointertocaller'sfprocstruct*/21408EXTERNintsuper_user;/*1ifcallerissuper_user,else0*/21409EXTERNintsusp_count;/*numberofprocssuspendedonpipe*/21410EXTERNintnr_locks;/*numberoflockscurrentlyinplace*/21411EXTERNintreviving;/*numberofpipeprocessestoberevived*/21412EXTERNoff_trdahedpos;/*positiontoreadahead*/21413EXTERNstructinode*rdahed_inode;/*pointertoinodetoreadahead*/21414EXTERNDev_troot_dev;/*devicenumberoftherootdevice*/21415EXTERNtime_tboottime;/*timeinsecondsatsystemboot*/2141621417/*Theparametersofthecallarekepthere.
*/21418EXTERNmessagem_in;/*theinputmessageitself*/21419EXTERNmessagem_out;/*theoutputmessageusedforreply*/21420EXTERNintwho;/*caller'sprocnumber*/21421EXTERNintcall_nr;/*systemcallnumber*/21422EXTERNcharuser_path[PATH_MAX];/*storageforuserpathname*/2142321424/*Thefollowingvariablesareusedforreturningresultstothecaller.
*/21425EXTERNinterr_code;/*temporarystorageforerrornumber*/21426EXTERNintrdwt_err;/*statusoflastdiski/orequest*/2142721428/*Datainitializedelsewhere.
*/21429extern_PROTOTYPE(int(*call_vec[]),(void));/*syscalltable*/21430externchardot1[2];/*dot1(&dot1[0])anddot2(&dot2[0])haveaspecial*/21431externchardot2[3];/*meaningtosearch_dir:noaccesspermissioncheck.
*/servers/fs/fproc.
h21500/*Thisistheper-processinformation.
Aslotisreservedforeachpotential21501*process.
ThusNR_PROCSmustbethesameasinthekernel.
Itisnot21502*possibleorevennecessarytotellwhenaslotisfreehere.
21503*/21504EXTERNstructfproc{21505mode_tfp_umask;/*masksetbyumasksystemcall*/21506structinode*fp_workdir;/*pointertoworkingdirectory'sinode*/21507structinode*fp_rootdir;/*pointertocurrentrootdir(seechroot)*/21508structfilp*fp_filp[OPEN_MAX];/*thefiledescriptortable*/21509uid_tfp_realuid;/*realuserid*/21510uid_tfp_effuid;/*effectiveuserid*/21511gid_tfp_realgid;/*realgroupid*/21512gid_tfp_effgid;/*effectivegroupid*/21513dev_tfp_tty;/*major/minorofcontrollingtty*/21514intfp_fd;/*placetosavefdifrd/wrcan'tfinish*/788File:servers/fs/fproc.
hMINIXSOURCECODE21515char*fp_buffer;/*placetosavebufferifrd/wrcan'tfinish*/21516intfp_nbytes;/*placetosavebytesifrd/wrcan'tfinish*/21517intfp_cum_io_partial;/*partialbytecountifrd/wrcan'tfinish*/21518charfp_suspended;/*settoindicateprocesshanging*/21519charfp_revived;/*settoindicateprocessbeingrevived*/21520charfp_task;/*whichtaskisprocsuspendedon*/21521charfp_sesldr;/*trueifprocisasessionleader*/21522pid_tfp_pid;/*processid*/21523longfp_cloexec;/*bitmapforPOSIXTable6-2FD_CLOEXEC*/21524}fproc[NR_PROCS];2152521526/*Fieldvalues.
*/21527#defineNOT_SUSPENDED0/*processisnotsuspendedonpipeortask*/21528#defineSUSPENDED1/*processissuspendedonpipeortask*/21529#defineNOT_REVIVING0/*processisnotbeingrevived*/21530#defineREVIVING1/*processisbeingrevivedfromsuspension*/21531#definePID_FREE0/*processslotfree*/2153221533/*Checkisprocessnumberisacceptable-includessystemprocesses.
*/21534#defineisokprocnr(n)((unsigned)((n)+NR_TASKS)/*needstructdirect*/21614#include2161521616EXTERNstructbuf{21617/*Dataportionofthebuffer.
*/21618union{21619charb__data[MAX_BLOCK_SIZE];/*ordinaryuserdata*/21620/*directoryblock*/21621structdirectb__dir[NR_DIR_ENTRIES(MAX_BLOCK_SIZE)];21622/*V1indirectblock*/21623zone1_tb__v1_ind[V1_INDIRECTS];21624/*V2indirectblock*/21625zone_tb__v2_ind[V2_INDIRECTS(MAX_BLOCK_SIZE)];21626/*V1inodeblock*/21627d1_inodeb__v1_ino[V1_INODES_PER_BLOCK];21628/*V2inodeblock*/21629d2_inodeb__v2_ino[V2_INODES_PER_BLOCK(MAX_BLOCK_SIZE)];MINIXSOURCECODEFile:servers/fs/buf.
h78921630/*bitmapblock*/21631bitchunk_tb__bitmap[FS_BITMAP_CHUNKS(MAX_BLOCK_SIZE)];21632}b;2163321634/*Headerportionofthebuffer.
*/21635structbuf*b_next;/*usedtolinkallfreebufsinachain*/21636structbuf*b_prev;/*usedtolinkallfreebufstheotherway*/21637structbuf*b_hash;/*usedtolinkbufsonhashchains*/21638block_tb_blocknr;/*blocknumberofits(minor)device*/21639dev_tb_dev;/*major|minordevicewhereblockresides*/21640charb_dirt;/*CLEANorDIRTY*/21641charb_count;/*numberofusersofthisbuffer*/21642}buf[NR_BUFS];2164321644/*Ablockisfreeifb_dev==NO_DEV.
*/2164521646#defineNIL_BUF((structbuf*)0)/*indicatesabsenceofabuffer*/2164721648/*Thesedefsmakeitpossibletousetobp->b_datainsteadofbp->b.
b__data*/21649#defineb_datab.
b__data21650#defineb_dirb.
b__dir21651#defineb_v1_indb.
b__v1_ind21652#defineb_v2_indb.
b__v2_ind21653#defineb_v1_inob.
b__v1_ino21654#defineb_v2_inob.
b__v2_ino21655#defineb_bitmapb.
b__bitmap2165621657EXTERNstructbuf*buf_hash[NR_BUF_HASH];/*thebufferhashtable*/2165821659EXTERNstructbuf*front;/*pointstoleastrecentlyusedfreeblock*/21660EXTERNstructbuf*rear;/*pointstomostrecentlyusedfreeblock*/21661EXTERNintbufs_in_use;/*#bufscurrentlyinuse(notonfreelist)*/2166221663/*Whenablockisreleased,thetypeofusageispassedtoput_block().
*/21664#defineWRITE_IMMED0100/*blockshouldbewrittentodisknow*/21665#defineONE_SHOT0200/*setifblocknotlikelytobeneededsoon*/2166621667#defineINODE_BLOCK0/*inodeblock*/21668#defineDIRECTORY_BLOCK1/*directoryblock*/21669#defineINDIRECT_BLOCK2/*pointerblock*/21670#defineMAP_BLOCK3/*bitmap*/21671#defineFULL_DATA_BLOCK5/*data,fullyused*/21672#definePARTIAL_DATA_BLOCK6/*data,partlyused*/2167321674#defineHASH_MASK(NR_BUF_HASH-1)/*maskforhashingblocknumbers*/servers/fs/file.
h21700/*Thisisthefilptable.
Itisanintermediarybetweenfiledescriptorsand21701*inodes.
Aslotisfreeiffilp_count==0.
21702*/2170321704EXTERNstructfilp{21705mode_tfilp_mode;/*RWbits,tellinghowfileisopened*/21706intfilp_flags;/*flagsfromopenandfcntl*/21707intfilp_count;/*howmanyfiledescriptorssharethisslot*/21708structinode*filp_ino;/*pointertotheinode*/21709off_tfilp_pos;/*fileposition*/790File:servers/fs/file.
hMINIXSOURCECODE2171021711/*thefollowingfieldsareforselect()andareownedbythegeneric21712*select()code(i.
e.
,fd-type-specificselect()codecan'ttouchthese).
21713*/21714intfilp_selectors;/*select()ingprocessesblockingonthisfd*/21715intfilp_select_ops;/*interestedintheseSEL_*operations*/2171621717/*followingareforfd-type-specificselect()*/21718intfilp_pipe_select_ops;21719}filp[NR_FILPS];2172021721#defineFILP_CLOSED0/*filp_mode:associateddeviceclosed*/2172221723#defineNIL_FILP(structfilp*)0/*indicatesabsenceofafilpslot*/servers/fs/lock.
h21800/*Thisisthefilelockingtable.
Likethefilptable,itpointstothe21801*inodetable,however,inthiscasetoachieveadvisorylocking.
21802*/21803EXTERNstructfile_lock{21804shortlock_type;/*F_RDLOCKorF_WRLOCK;0meansunusedslot*/21805pid_tlock_pid;/*pidoftheprocessholdingthelock*/21806structinode*lock_inode;/*pointertotheinodelocked*/21807off_tlock_first;/*offsetoffirstbytelocked*/21808off_tlock_last;/*offsetoflastbytelocked*/21809}file_lock[NR_LOCKS];servers/fs/inode.
h21900/*Inodetable.
Thistableholdsinodesthatarecurrentlyinuse.
Insome21901*casestheyhavebeenopenedbyanopen()orcreat()systemcall,inother21902*casesthefilesystemitselfneedstheinodeforonereasonoranother,21903*suchastosearchadirectoryforapathname.
21904*Thefirstpartofthestructholdsfieldsthatarepresentonthe21905*disk;thesecondpartholdsfieldsnotpresentonthedisk.
21906*Thediskinodepartisalsodeclaredin"type.
h"as'd1_inode'forV121907*filesystemsand'd2_inode'forV2filesystems.
21908*/2190921910EXTERNstructinode{21911mode_ti_mode;/*filetype,protection,etc.
*/21912nlink_ti_nlinks;/*howmanylinkstothisfile*/21913uid_ti_uid;/*useridofthefile'sowner*/21914gid_ti_gid;/*groupnumber*/21915off_ti_size;/*currentfilesizeinbytes*/21916time_ti_atime;/*timeoflastaccess(V2only)*/21917time_ti_mtime;/*whenwasfiledatalastchanged*/21918time_ti_ctime;/*whenwasinodeitselfchanged(V2only)*/21919zone_ti_zone[V2_NR_TZONES];/*zonenumbersfordirect,ind,anddblind*/2192021921/*Thefollowingitemsarenotpresentonthedisk.
*/21922dev_ti_dev;/*whichdeviceistheinodeon*/21923ino_ti_num;/*inodenumberonits(minor)device*/21924inti_count;/*#timesinodeused;0meansslotisfree*/MINIXSOURCECODEFile:servers/fs/inode.
h79121925inti_ndzones;/*#directzones(Vx_NR_DZONES)*/21926inti_nindirs;/*#indirectzonesperindirectblock*/21927structsuper_block*i_sp;/*pointertosuperblockforinode'sdevice*/21928chari_dirt;/*CLEANorDIRTY*/21929chari_pipe;/*settoI_PIPEifpipe*/21930chari_mount;/*thisbitissetiffilemountedon*/21931chari_seek;/*setonLSEEK,clearedonREAD/WRITE*/21932chari_update;/*theATIME,CTIME,andMTIMEbitsarehere*/21933}inode[NR_INODES];2193421935#defineNIL_INODE(structinode*)0/*indicatesabsenceofinodeslot*/2193621937/*Fieldvalues.
NotethatCLEANandDIRTYaredefinedin"const.
h"*/21938#defineNO_PIPE0/*i_pipeisNO_PIPEifinodeisnotapipe*/21939#defineI_PIPE1/*i_pipeisI_PIPEifinodeisapipe*/21940#defineNO_MOUNT0/*i_mountisNO_MOUNTiffilenotmountedon*/21941#defineI_MOUNT1/*i_mountisI_MOUNTiffilemountedon*/21942#defineNO_SEEK0/*i_seek=NO_SEEKiflastopwasnotSEEK*/21943#defineISEEK1/*i_seek=ISEEKiflastopwasSEEK*/servers/fs/param.
h22000/*Thefollowingnamesaresynonymsforthevariablesintheinputmessage.
*/22001#defineacc_timem2_l122002#defineaddrm1_i322003#definebufferm1_p122004#definechildm1_i222005#defineco_modem1_i122006#defineeff_grp_idm1_i322007#defineeff_user_idm1_i322008#defineerkim1_p122009#definefdm1_i122010#definefd2m1_i222011#defineioflagsm1_i322012#definegroupm1_i322013#definereal_grp_idm1_i222014#definels_fdm2_i122015#definemk_modem1_i222016#definemk_z0m1_i322017#definemodem3_i222018#definec_modem1_i322019#definec_namem1_p122020#definenamem3_p122021#definename1m1_p122022#definename2m1_p222023#definename_lengthm3_i122024#definename1_lengthm1_i122025#definename2_lengthm1_i222026#definenbytesm1_i222027#defineownerm1_i222028#defineparentm1_i122029#definepathnamem3_ca122030#definepidm1_i322031#defineprom1_i122032#definectl_reqm4_l122033#definedriver_nrm4_l222034#definedev_nrm4_l3792File:servers/fs/param.
hMINIXSOURCECODE22035#definedev_stylem4_l422036#definerd_onlym1_i322037#definereal_user_idm1_i222038#definerequestm1_i222039#definesigm1_i222040#defineslot1m1_i122041#definetpm2_l122042#defineutime_actimem2_l122043#defineutime_modtimem2_l222044#defineutime_filem2_p122045#defineutime_lengthm2_i122046#defineutime_strlenm2_i222047#definewhencem2_i222048#definesvrctl_reqm2_i122049#definesvrctl_argpm2_p122050#definepm_stimem1_i122051#defineinfo_whatm1_i122052#defineinfo_wherem1_p12205322054/*Thefollowingnamesaresynonymsforthevariablesintheoutputmessage.
*/22055#definereply_typem_type22056#definereply_l1m2_l122057#definereply_i1m1_i122058#definereply_i2m1_i222059#definereply_t1m4_l122060#definereply_t2m4_l222061#definereply_t3m4_l322062#definereply_t4m4_l422063#definereply_t5m4_l5servers/fs/super.
h22100/*Superblocktable.
Therootfilesystemandeverymountedfilesystem22101*hasanentryhere.
Theentryholdsinformationaboutthesizesofthebit22102*mapsandinodes.
Thes_ninodesfieldgivesthenumberofinodesavailable22103*forfilesanddirectories,includingtherootdirectory.
Inode0is22104*onthedisk,butnotused.
Thuss_ninodes=4meansthat5bitswillbe22105*usedinthebitmap,bit0,whichisalways1andnotused,andbits1-422106*forfilesanddirectories.
Thedisklayoutis:22107*22108*Item#blocks22109*bootblock122110*superblock1(offset1kB)22111*inodemaps_imap_blocks22112*zonemaps_zmap_blocks22113*inodes(s_ninodes+'inodesperblock'-1)/'inodesperblock'22114*unusedwhateverisneededtofilloutthecurrentzone22115*datazones(s_zones-s_firstdatazone)22208#include22209#include"buf.
h"22210#include"file.
h"22211#include"fproc.
h"22212#include"inode.
h"22213#include"lock.
h"22214#include"super.
h"2221522216PUBLIC_PROTOTYPE(int(*call_vec[]),(void))={22217no_sys,/*0=unused*/22218do_exit,/*1=exit*/22219do_fork,/*2=fork*/794File:servers/fs/table.
cMINIXSOURCECODE22220do_read,/*3=read*/22221do_write,/*4=write*/22222do_open,/*5=open*/22223do_close,/*6=close*/22224no_sys,/*7=wait*/22225do_creat,/*8=creat*/22226do_link,/*9=link*/22227do_unlink,/*10=unlink*/22228no_sys,/*11=waitpid*/22229do_chdir,/*12=chdir*/22230no_sys,/*13=time*/22231do_mknod,/*14=mknod*/22232do_chmod,/*15=chmod*/22233do_chown,/*16=chown*/22234no_sys,/*17=break*/22235do_stat,/*18=stat*/22236do_lseek,/*19=lseek*/22237no_sys,/*20=getpid*/22238do_mount,/*21=mount*/22239do_umount,/*22=umount*/22240do_set,/*23=setuid*/22241no_sys,/*24=getuid*/22242do_stime,/*25=stime*/22243no_sys,/*26=ptrace*/22244no_sys,/*27=alarm*/22245do_fstat,/*28=fstat*/22246no_sys,/*29=pause*/22247do_utime,/*30=utime*/22248no_sys,/*31=(stty)*/22249no_sys,/*32=(gtty)*/22250do_access,/*33=access*/22251no_sys,/*34=(nice)*/22252no_sys,/*35=(ftime)*/22253do_sync,/*36=sync*/22254no_sys,/*37=kill*/22255do_rename,/*38=rename*/22256do_mkdir,/*39=mkdir*/22257do_unlink,/*40=rmdir*/22258do_dup,/*41=dup*/22259do_pipe,/*42=pipe*/22260no_sys,/*43=times*/22261no_sys,/*44=(prof)*/22262no_sys,/*45=unused*/22263do_set,/*46=setgid*/22264no_sys,/*47=getgid*/22265no_sys,/*48=(signal)*/22266no_sys,/*49=unused*/22267no_sys,/*50=unused*/22268no_sys,/*51=(acct)*/22269no_sys,/*52=(phys)*/22270no_sys,/*53=(lock)*/22271do_ioctl,/*54=ioctl*/22272do_fcntl,/*55=fcntl*/22273no_sys,/*56=(mpx)*/22274no_sys,/*57=unused*/22275no_sys,/*58=unused*/22276do_exec,/*59=execve*/22277do_umask,/*60=umask*/22278do_chroot,/*61=chroot*/22279do_setsid,/*62=setsid*/MINIXSOURCECODEFile:servers/fs/table.
c79522280no_sys,/*63=getpgrp*/2228122282no_sys,/*64=KSIG:signalsoriginatinginthekernel*/22283do_unpause,/*65=UNPAUSE*/22284no_sys,/*66=unused*/22285do_revive,/*67=REVIVE*/22286no_sys,/*68=TASK_REPLY*/22287no_sys,/*69=unused*/22288no_sys,/*70=unused*/22289no_sys,/*71=si*/22290no_sys,/*72=sigsuspend*/22291no_sys,/*73=sigpending*/22292no_sys,/*74=sigprocmask*/22293no_sys,/*75=sigreturn*/22294do_reboot,/*76=reboot*/22295do_svrctl,/*77=svrctl*/2229622297no_sys,/*78=unused*/22298do_getsysinfo,/*79=getsysinfo*/22299no_sys,/*80=unused*/22300do_devctl,/*81=devctl*/22301do_fstatfs,/*82=fstatfs*/22302no_sys,/*83=memalloc*/22303no_sys,/*84=memfree*/22304do_select,/*85=select*/22305do_fchdir,/*86=fchdir*/22306do_fsync,/*87=fsync*/22307no_sys,/*88=getpriority*/22308no_sys,/*89=setpriority*/22309no_sys,/*90=gettimeofday*/22310};22311/*Thisshouldnotfailwith"arraysizeisnegative":*/22312externintdummy[sizeof(call_vec)==NCALLS*sizeof(call_vec[0])1:-1];22313servers/fs/cache.
c22400/*Thefilesystemmaintainsabuffercachetoreducethenumberofdisk22401*accessesneeded.
Wheneverareadorwritetothediskisdone,acheckis22402*firstmadetoseeiftheblockisinthecache.
Thisfilemanagesthe22403*cache.
22404*22405*Theentrypointsintothisfileare:22406*get_block:requesttofetchablockforreadingorwritingfromcache22407*put_block:returnablockpreviouslyrequestedwithget_block22408*alloc_zone:allocateanewzone(toincreasethelengthofafile)22409*free_zone:releaseazone(whenafileisremoved)22410*rw_block:readorwriteablockfromthediskitself22411*invalidate:removeallthecacheblocksonsomedevice22412*/2241322414#include"fs.
h"22415#include22416#include"buf.
h"22417#include"file.
h"22418#include"fproc.
h"22419#include"super.
h"796File:servers/fs/cache.
cMINIXSOURCECODE2242022421FORWARD_PROTOTYPE(voidrm_lru,(structbuf*bp));224222242322424*get_block*2242522426PUBLICstructbuf*get_block(dev,block,only_search)22427registerdev_tdev;/*onwhichdeviceistheblock*/22428registerblock_tblock;/*whichblockiswanted*/22429intonly_search;/*ifNO_READ,don'tread,elseactnormal*/22430{22431/*Checktoseeiftherequestedblockisintheblockcache.
Ifso,return22432*apointertoit.
Ifnot,evictsomeotherblockandfetchit(unless22433*'only_search'is1).
Alltheblocksinthecachethatarenotinuse22434*arelinkedtogetherinachain,with'front'pointingtotheleastrecently22435*usedblockand'rear'tothemostrecentlyusedblock.
If'only_search'is22436*1,theblockbeingrequestedwillbeoverwritteninitsentirety,soitis22437*onlynecessarytoseeifitisinthecache;ifitisnot,anyfreebuffer22438*willdo.
Itisnotnecessarytoactuallyreadtheblockinfromdisk.
22439*If'only_search'isPREFETCH,theblockneednotbereadfromthedisk,22440*andthedeviceisnottobemarkedontheblock,socallerscantellif22441*theblockreturnedisvalid.
22442*InadditiontotheLRUchain,thereisalsoahashchaintolinktogether22443*blockswhoseblocknumbersendwiththesamebitstrings,forfastlookup.
22444*/2244522446intb;22447registerstructbuf*bp,*prev_ptr;2244822449/*Searchthehashchainfor(dev,block).
Do_read()canuse22450*get_block(NO_DEV.
.
.
)togetanunnamedblocktofillwithzeroswhen22451*someonewantstoreadfromaholeinafile,inwhichcasethissearch22452*isskipped22453*/22454if(dev!
=NO_DEV){22455b=(int)block&HASH_MASK;22456bp=buf_hash[b];22457while(bp!
=NIL_BUF){22458if(bp->b_blocknr==block&&bp->b_dev==dev){22459/*Blockneededhasbeenfound.
*/22460if(bp->b_count==0)rm_lru(bp);22461bp->b_count++;/*recordthatblockisinuse*/2246222463return(bp);22464}else{22465/*Thisblockisnottheonesought.
*/22466bp=bp->b_hash;/*movetonextblockonhashchain*/22467}22468}22469}2247022471/*Desiredblockisnotonavailablechain.
Takeoldestblock('front').
*/22472if((bp=front)==NIL_BUF)panic(__FILE__,"allbuffersinuse",NR_BUFS);22473rm_lru(bp);2247422475/*Removetheblockthatwasjusttakenfromitshashchain.
*/22476b=(int)bp->b_blocknr&HASH_MASK;22477prev_ptr=buf_hash[b];22478if(prev_ptr==bp){22479buf_hash[b]=bp->b_hash;MINIXSOURCECODEFile:servers/fs/cache.
c79722480}else{22481/*Theblockjusttakenisnotonthefrontofitshashchain.
*/22482while(prev_ptr->b_hash!
=NIL_BUF)22483if(prev_ptr->b_hash==bp){22484prev_ptr->b_hash=bp->b_hash;/*foundit*/22485break;22486}else{22487prev_ptr=prev_ptr->b_hash;/*keeplooking*/22488}22489}2249022491/*Iftheblocktakenisdirty,makeitcleanbywritingittothedisk.
22492*Avoidhysteresisbyflushingallotherdirtyblocksforthesamedevice.
22493*/22494if(bp->b_dev!
=NO_DEV){22495if(bp->b_dirt==DIRTY)flushall(bp->b_dev);22496}2249722498/*Fillinblock'sparametersandaddittothehashchainwhereitgoes.
*/22499bp->b_dev=dev;/*fillindevicenumber*/22500bp->b_blocknr=block;/*fillinblocknumber*/22501bp->b_count++;/*recordthatblockisbeingused*/22502b=(int)bp->b_blocknr&HASH_MASK;22503bp->b_hash=buf_hash[b];22504buf_hash[b]=bp;/*addtohashlist*/2250522506/*Gogettherequestedblockunlesssearchingorprefetching.
*/22507if(dev!
=NO_DEV){22508if(only_search==PREFETCH)bp->b_dev=NO_DEV;22509else22510if(only_search==NORMAL){22511rw_block(bp,READING);22512}22513}22514return(bp);/*returnthenewlyacquiredblock*/22515}2251722518*put_block*2251922520PUBLICvoidput_block(bp,block_type)22521registerstructbuf*bp;/*pointertothebuffertobereleased*/22522intblock_type;/*INODE_BLOCK,DIRECTORY_BLOCK,orwhatever*/22523{22524/*Returnablocktothelistofavailableblocks.
Dependingon'block_type'22525*itmaybeputonthefrontorrearoftheLRUchain.
Blocksthatare22526*expectedtobeneededagainshortly(e.
g.
,partiallyfulldatablocks)22527*goontherear;blocksthatareunlikelytobeneededagainshortly22528*(e.
g.
,fulldatablocks)goonthefront.
Blockswhoselosscanhurt22529*theintegrityofthefilesystem(e.
g.
,inodeblocks)arewrittento22530*diskimmediatelyiftheyaredirty.
22531*/22532if(bp==NIL_BUF)return;/*itiseasiertocheckherethanincaller*/2253322534bp->b_count--;/*thereisoneusefewernow*/22535if(bp->b_count!
=0)return;/*blockisstillinuse*/2253622537bufs_in_use--;/*onefewerblockbuffersinuse*/2253822539/*PutthisblockbackontheLRUchain.
IftheONE_SHOTbitissetin798File:servers/fs/cache.
cMINIXSOURCECODE22540*'block_type',theblockisnotlikelytobeneededagainshortly,soput22541*itonthefrontoftheLRUchainwhereitwillbethefirstonetobe22542*takenwhenafreebufferisneededlater.
22543*/22544if(bp->b_dev==DEV_RAM||block_type&ONE_SHOT){22545/*Blockprobablywon'tbeneededquickly.
Putitonfrontofchain.
22546*Itwillbethenextblocktobeevictedfromthecache.
22547*/22548bp->b_prev=NIL_BUF;22549bp->b_next=front;22550if(front==NIL_BUF)22551rear=bp;/*LRUchainwasempty*/22552else22553front->b_prev=bp;22554front=bp;22555}else{22556/*Blockprobablywillbeneededquickly.
Putitonrearofchain.
22557*Itwillnotbeevictedfromthecacheforalongtime.
22558*/22559bp->b_prev=rear;22560bp->b_next=NIL_BUF;22561if(rear==NIL_BUF)22562front=bp;22563else22564rear->b_next=bp;22565rear=bp;22566}2256722568/*Someblocksaresoimportant(e.
g.
,inodes,indirectblocks)thatthey22569*shouldbewrittentothediskimmediatelytoavoidmessingupthefile22570*systemintheeventofacrash.
22571*/22572if((block_type&WRITE_IMMED)&&bp->b_dirt==DIRTY&&bp->b_dev!
=NO_DEV){22573rw_block(bp,WRITING);22574}22575}2257722578*alloc_zone*2257922580PUBLICzone_talloc_zone(dev,z)22581dev_tdev;/*devicewherezonewanted*/22582zone_tz;/*trytoallocatenewzonenearthisone*/22583{22584/*Allocateanewzoneontheindicateddeviceandreturnitsnumber.
*/2258522586intmajor,minor;22587bit_tb,bit;22588structsuper_block*sp;2258922590/*Notethattheroutinealloc_bit()returns1forthelowestpossible22591*zone,whichcorrespondstosp->s_firstdatazone.
Toconvertavalue22592*betweenthebitnumber,'b',usedbyalloc_bit()andthezonenumber,'z',22593*storedintheinode,usetheformula:22594*z=b+sp->s_firstdatazone-122595*Alloc_bit()neverreturns0,sincethisisusedforNO_BIT(failure).
22596*/22597sp=get_super(dev);2259822599/*Ifzis0,skipinitialpartofthemapknowntobefullyinuse.
*/MINIXSOURCECODEFile:servers/fs/cache.
c79922600if(z==sp->s_firstdatazone){22601bit=sp->s_zsearch;22602}else{22603bit=(bit_t)z-(sp->s_firstdatazone-1);22604}22605b=alloc_bit(sp,ZMAP,bit);22606if(b==NO_BIT){22607err_code=ENOSPC;22608major=(int)(sp->s_dev>>MAJOR)&BYTE;22609minor=(int)(sp->s_dev>>MINOR)&BYTE;22610printf("Nospaceon%sdevice%d/%d\n",22611sp->s_dev==root_dev"root":"",major,minor);22612return(NO_ZONE);22613}22614if(z==sp->s_firstdatazone)sp->s_zsearch=b;/*fornexttime*/22615return(sp->s_firstdatazone-1+(zone_t)b);22616}2261822619*free_zone*2262022621PUBLICvoidfree_zone(dev,numb)22622dev_tdev;/*devicewherezonelocated*/22623zone_tnumb;/*zonetobereturned*/22624{22625/*Returnazone.
*/2262622627registerstructsuper_block*sp;22628bit_tbit;2262922630/*Locatetheappropriatesuper_blockandreturnbit.
*/22631sp=get_super(dev);22632if(numbs_firstdatazone||numb>=sp->s_zones)return;22633bit=(bit_t)(numb-(sp->s_firstdatazone-1));22634free_bit(sp,ZMAP,bit);22635if(bits_zsearch)sp->s_zsearch=bit;22636}2263822639*rw_block*2264022641PUBLICvoidrw_block(bp,rw_flag)22642registerstructbuf*bp;/*bufferpointer*/22643intrw_flag;/*READINGorWRITING*/22644{22645/*Readorwriteadiskblock.
Thisistheonlyroutineinwhichactualdisk22646*I/Oisinvoked.
Ifanerroroccurs,amessageisprintedhere,buttheerror22647*isnotreportedtothecaller.
Iftheerroroccurredwhilepurgingablock22648*fromthecache,itisnotclearwhatthecallercoulddoaboutitanyway.
22649*/2265022651intr,op;22652off_tpos;22653dev_tdev;22654intblock_size;2265522656block_size=get_block_size(bp->b_dev);2265722658if((dev=bp->b_dev)!
=NO_DEV){22659pos=(off_t)bp->b_blocknr*block_size;800File:servers/fs/cache.
cMINIXSOURCECODE22660op=(rw_flag==READINGDEV_READ:DEV_WRITE);22661r=dev_io(op,dev,FS_PROC_NR,bp->b_data,pos,block_size,0);22662if(r!
=block_size){22663if(r>=0)r=END_OF_FILE;22664if(r!
=END_OF_FILE)22665printf("Unrecoverablediskerrorondevice%d/%d,block%ld\n",22666(dev>>MAJOR)&BYTE,(dev>>MINOR)&BYTE,bp->b_blocknr);22667bp->b_dev=NO_DEV;/*invalidateblock*/2266822669/*Reportreaderrorstointerestedparties.
*/22670if(rw_flag==READING)rdwt_err=r;22671}22672}2267322674bp->b_dirt=CLEAN;22675}2267722678*invalidate*2267922680PUBLICvoidinvalidate(device)22681dev_tdevice;/*devicewhoseblocksaretobepurged*/22682{22683/*Removealltheblocksbelongingtosomedevicefromthecache.
*/2268422685registerstructbuf*bp;2268622687for(bp=&buf[0];bpb_dev==device)bp->b_dev=NO_DEV;22689}2269122692*flushall*2269322694PUBLICvoidflushall(dev)22695dev_tdev;/*devicetoflush*/22696{22697/*Flushalldirtyblocksforonedevice.
*/2269822699registerstructbuf*bp;22700staticstructbuf*dirty[NR_BUFS];/*staticsoitisn'tonstack*/22701intndirty;2270222703for(bp=&buf[0],ndirty=0;bpb_dirt==DIRTY&&bp->b_dev==dev)dirty[ndirty++]=bp;22705rw_scattered(dev,dirty,ndirty,WRITING);22706}2270822709*rw_scattered*2271022711PUBLICvoidrw_scattered(dev,bufq,bufqsize,rw_flag)22712dev_tdev;/*major-minordevicenumber*/22713structbuf**bufq;/*pointertoarrayofbuffers*/22714intbufqsize;/*numberofbuffers*/22715intrw_flag;/*READINGorWRITING*/22716{22717/*Readorwritescattereddatafromadevice.
*/2271822719registerstructbuf*bp;MINIXSOURCECODEFile:servers/fs/cache.
c80122720intgap;22721registerinti;22722registeriovec_t*iop;22723staticiovec_tiovec[NR_IOREQS];/*staticsoitisn'tonstack*/22724intj,r;22725intblock_size;2272622727block_size=get_block_size(dev);2272822729/*(Shell)sortbuffersonb_blocknr.
*/22730gap=1;22731do22732gap=3*gap+1;22733while(gap=0&&bufq[i]->b_blocknr>bufq[i+gap]->b_blocknr;22739i-=gap){22740bp=bufq[i];22741bufq[i]=bufq[i+gap];22742bufq[i+gap]=bp;22743}22744}22745}2274622747/*SetupI/OvectoranddoI/O.
Theresultofdev_ioisOKifeverything22748*wentfine,otherwisetheerrorcodeforthefirstfailedtransfer.
22749*/22750while(bufqsize>0){22751for(j=0,iop=iovec;jb_blocknr!
=bufq[0]->b_blocknr+j)break;22754iop->iov_addr=(vir_bytes)bp->b_data;22755iop->iov_size=block_size;22756}22757r=dev_io(rw_flag==WRITINGDEV_SCATTER:DEV_GATHER,22758dev,FS_PROC_NR,iovec,22759(off_t)bufq[0]->b_blocknr*block_size,j,0);2276022761/*Harvesttheresults.
Dev_ioreportsthefirsterroritmayhave22762*encountered,butweonlycareifit'sthefirstblockthatfailed.
22763*/22764for(i=0,iop=iovec;iiov_size!
=0){22767/*Transferfailed.
AnerrorDowecare*/22768if(r!
=OK&&i==0){22769printf(22770"fs:I/Oerrorondevice%d/%d,block%lu\n",22771(dev>>MAJOR)&BYTE,(dev>>MINOR)&BYTE,22772bp->b_blocknr);22773bp->b_dev=NO_DEV;/*invalidateblock*/22774}22775break;22776}22777if(rw_flag==READING){22778bp->b_dev=dev;/*validateblock*/22779put_block(bp,PARTIAL_DATA_BLOCK);802File:servers/fs/cache.
cMINIXSOURCECODE22780}else{22781bp->b_dirt=CLEAN;22782}22783}22784bufq+=i;22785bufqsize-=i;22786if(rw_flag==READING){22787/*Don'tbotherreadingmorethanthedeviceiswillingto22788*giveatthistime.
Don'tforgettoreleasethoseextras.
22789*/22790while(bufqsize>0){22791put_block(*bufq++,PARTIAL_DATA_BLOCK);22792bufqsize--;22793}22794}22795if(rw_flag==WRITING&&i==0){22796/*We'renotmakingprogress,thismeanswemightkeep22797*looping.
Buffersremaindirtyifun-written.
Buffersare22798*lostifinvalidate()dorLRU-removedwhiledirty.
This22799*isbetterthankeepingunwritableblocksaroundforever.
.
22800*/22801break;22802}22803}22804}2280622807*rm_lru*2280822809PRIVATEvoidrm_lru(bp)22810structbuf*bp;22811{22812/*RemoveablockfromitsLRUchain.
*/22813structbuf*next_ptr,*prev_ptr;2281422815bufs_in_use++;22816next_ptr=bp->b_next;/*successoronLRUchain*/22817prev_ptr=bp->b_prev;/*predecessoronLRUchain*/22818if(prev_ptr!
=NIL_BUF)22819prev_ptr->b_next=next_ptr;22820else22821front=next_ptr;/*thisblockwasatfrontofchain*/2282222823if(next_ptr!
=NIL_BUF)22824next_ptr->b_prev=prev_ptr;22825else22826rear=prev_ptr;/*thisblockwasatrearofchain*/22827}servers/fs/inode.
c22900/*Thisfilemanagestheinodetable.
Thereareprocedurestoallocateand22901*deallocateinodes,acquire,erase,andreleasethem,andreadandwrite22902*themfromthedisk.
22903*22904*TheentrypointsintothisfileareMINIXSOURCECODEFile:servers/fs/inode.
c80322905*get_inode:searchinodetableforagiveninode;ifnotthere,22906*readit22907*put_inode:indicatethataninodeisnolongerneededinmemory22908*alloc_inode:allocateanew,unusedinode22909*wipe_inode:erasesomefieldsofanewlyallocatedinode22910*free_inode:markaninodeasavailableforanewfile22911*update_times:updateatime,ctime,andmtime22912*rw_inode:readadiskblockandextractaninode,orcorresp.
write22913*old_icopy:copyto/fromin-coreinodestructanddiskinode(V1.
x)22914*new_icopy:copyto/fromin-coreinodestructanddiskinode(V2.
x)22915*dup_inode:indicatethatsomeoneelseisusinganinodetableentry22916*/2291722918#include"fs.
h"22919#include"buf.
h"22920#include"file.
h"22921#include"fproc.
h"22922#include"inode.
h"22923#include"super.
h"2292422925FORWARD_PROTOTYPE(voidold_icopy,(structinode*rip,d1_inode*dip,22926intdirection,intnorm));22927FORWARD_PROTOTYPE(voidnew_icopy,(structinode*rip,d2_inode*dip,22928intdirection,intnorm));229292293022931*get_inode*2293222933PUBLICstructinode*get_inode(dev,numb)22934dev_tdev;/*deviceonwhichinoderesides*/22935intnumb;/*inodenumber(ANSI:maynotbeunshort)*/22936{22937/*Findaslotintheinodetable,loadthespecifiedinodeintoit,and22938*returnapointertotheslot.
If'dev'==NO_DEV,justreturnafreeslot.
22939*/2294022941registerstructinode*rip,*xp;2294222943/*Searchtheinodetablebothfor(dev,numb)andafreeslot.
*/22944xp=NIL_INODE;22945for(rip=&inode[0];ripi_count>0){/*onlycheckusedslotsfor(dev,numb)*/22947if(rip->i_dev==dev&&rip->i_num==numb){22948/*Thisistheinodethatwearelookingfor.
*/22949rip->i_count++;22950return(rip);/*(dev,numb)found*/22951}22952}else{22953xp=rip;/*rememberthisfreeslotforlater*/22954}22955}2295622957/*Inodewewantisnotcurrentlyinuse.
Didwefindafreeslot*/22958if(xp==NIL_INODE){/*inodetablecompletelyfull*/22959err_code=ENFILE;22960return(NIL_INODE);22961}2296222963/*Afreeinodeslothasbeenlocated.
Loadtheinodeintoit.
*/22964xp->i_dev=dev;804File:servers/fs/inode.
cMINIXSOURCECODE22965xp->i_num=numb;22966xp->i_count=1;22967if(dev!
=NO_DEV)rw_inode(xp,READING);/*getinodefromdisk*/22968xp->i_update=0;/*allthetimesareinitiallyup-to-date*/2296922970return(xp);22971}2297322974*put_inode*2297522976PUBLICvoidput_inode(rip)22977registerstructinode*rip;/*pointertoinodetobereleased*/22978{22979/*Thecallerisnolongerusingthisinode.
Ifnooneelseisusingiteither22980*writeitbacktothediskimmediately.
Ifithasnolinks,truncateitand22981*returnittothepoolofavailableinodes.
22982*/2298322984if(rip==NIL_INODE)return;/*checkinghereiseasierthanincaller*/22985if(--rip->i_count==0){/*i_count==0meansnooneisusingitnow*/22986if(rip->i_nlinks==0){22987/*i_nlinks==0meansfreetheinode.
*/22988truncate(rip);/*returnallthediskblocks*/22989rip->i_mode=I_NOT_ALLOC;/*clearI_TYPEfield*/22990rip->i_dirt=DIRTY;22991free_inode(rip->i_dev,rip->i_num);22992}else{22993if(rip->i_pipe==I_PIPE)truncate(rip);22994}22995rip->i_pipe=NO_PIPE;/*shouldalwaysbecleared*/22996if(rip->i_dirt==DIRTY)rw_inode(rip,WRITING);22997}22998}2300023001*alloc_inode*2300223003PUBLICstructinode*alloc_inode(dev_tdev,mode_tbits)23004{23005/*Allocateafreeinodeon'dev',andreturnapointertoit.
*/2300623007registerstructinode*rip;23008registerstructsuper_block*sp;23009intmajor,minor,inumb;23010bit_tb;2301123012sp=get_super(dev);/*getpointertosuper_block*/23013if(sp->s_rd_only){/*can'tallocateaninodeonareadonlydevice.
*/23014err_code=EROFS;23015return(NIL_INODE);23016}2301723018/*Acquireaninodefromthebitmap.
*/23019b=alloc_bit(sp,IMAP,sp->s_isearch);23020if(b==NO_BIT){23021err_code=ENFILE;23022major=(int)(sp->s_dev>>MAJOR)&BYTE;23023minor=(int)(sp->s_dev>>MINOR)&BYTE;23024printf("Outofi-nodeson%sdevice%d/%d\n",MINIXSOURCECODEFile:servers/fs/inode.
c80523025sp->s_dev==root_dev"root":"",major,minor);23026return(NIL_INODE);23027}23028sp->s_isearch=b;/*nexttimestarthere*/23029inumb=(int)b;/*becarefulnottopassunshortasparam*/2303023031/*Trytoacquireaslotintheinodetable.
*/23032if((rip=get_inode(NO_DEV,inumb))==NIL_INODE){23033/*Noinodetableslotsavailable.
Freetheinodejustallocated.
*/23034free_bit(sp,IMAP,b);23035}else{23036/*Aninodeslotisavailable.
Puttheinodejustallocatedintoit.
*/23037rip->i_mode=bits;/*setupRWXbits*/23038rip->i_nlinks=0;/*initialnolinks*/23039rip->i_uid=fp->fp_effuid;/*file'suidisowner's*/23040rip->i_gid=fp->fp_effgid;/*dittogroupid*/23041rip->i_dev=dev;/*markwhichdeviceitison*/23042rip->i_ndzones=sp->s_ndzones;/*numberofdirectzones*/23043rip->i_nindirs=sp->s_nindirs;/*numberofindirectzonesperblk*/23044rip->i_sp=sp;/*pointertosuperblock*/2304523046/*Fieldsnotclearedalreadyareclearedinwipe_inode().
Theyhave23047*beenputtherebecausetruncate()needstoclearthesamefieldsif23048*thefilehappenstobeopenwhilebeingtruncated.
Itsavesspace23049*nottorepeatthecodetwice.
23050*/23051wipe_inode(rip);23052}2305323054return(rip);23055}2305723058*wipe_inode*2305923060PUBLICvoidwipe_inode(rip)23061registerstructinode*rip;/*theinodetobeerased*/23062{23063/*Erasesomefieldsintheinode.
Thisfunctioniscalledfromalloc_inode()23064*whenanewinodeistobeallocated,andfromtruncate(),whenanexisting23065*inodeistobetruncated.
23066*/2306723068registerinti;2306923070rip->i_size=0;23071rip->i_update=ATIME|CTIME|MTIME;/*updatealltimeslater*/23072rip->i_dirt=DIRTY;23073for(i=0;ii_zone[i]=NO_ZONE;23074}2307623077*free_inode*2307823079PUBLICvoidfree_inode(dev,inumb)23080dev_tdev;/*onwhichdeviceistheinode*/23081ino_tinumb;/*numberofinodetobefreed*/23082{23083/*Returnaninodetothepoolofunallocatedinodes.
*/23084806File:servers/fs/inode.
cMINIXSOURCECODE23085registerstructsuper_block*sp;23086bit_tb;2308723088/*Locatetheappropriatesuper_block.
*/23089sp=get_super(dev);23090if(inumbsp->s_ninodes)return;23091b=inumb;23092free_bit(sp,IMAP,b);23093if(bs_isearch)sp->s_isearch=b;23094}2309623097*update_times*2309823099PUBLICvoidupdate_times(rip)23100registerstructinode*rip;/*pointertoinodetoberead/written*/23101{23102/*Varioussystemcallsarerequiredbythestandardtoupdateatime,ctime,23103*ormtime.
Sinceupdatingatimerequiressendingamessagetotheclock23104*task--anexpensivebusiness--thetimesaremarkedforupdatebysetting23105*bitsini_update.
Whenastat,fstat,orsyncisdone,oraninodeis23106*released,update_times()maybecalledtoactuallyfillinthetimes.
23107*/2310823109time_tcur_time;23110structsuper_block*sp;2311123112sp=rip->i_sp;/*getpointertosuperblock.
*/23113if(sp->s_rd_only)return;/*noupdatesforread-onlyfilesystems*/2311423115cur_time=clock_time();23116if(rip->i_update&ATIME)rip->i_atime=cur_time;23117if(rip->i_update&CTIME)rip->i_ctime=cur_time;23118if(rip->i_update&MTIME)rip->i_mtime=cur_time;23119rip->i_update=0;/*theyareallup-to-datenow*/23120}2312223123*rw_inode*2312423125PUBLICvoidrw_inode(rip,rw_flag)23126registerstructinode*rip;/*pointertoinodetoberead/written*/23127intrw_flag;/*READINGorWRITING*/23128{23129/*Anentryintheinodetableistobecopiedtoorfromthedisk.
*/2313023131registerstructbuf*bp;23132registerstructsuper_block*sp;23133d1_inode*dip;23134d2_inode*dip2;23135block_tb,offset;2313623137/*Gettheblockwheretheinoderesides.
*/23138sp=get_super(rip->i_dev);/*getpointertosuperblock*/23139rip->i_sp=sp;/*inodemustcontainsuperblockpointer*/23140offset=sp->s_imap_blocks+sp->s_zmap_blocks+2;23141b=(block_t)(rip->i_num-1)/sp->s_inodes_per_block+offset;23142bp=get_block(rip->i_dev,b,NORMAL);23143dip=bp->b_v1_ino+(rip->i_num-1)%V1_INODES_PER_BLOCK;23144dip2=bp->b_v2_ino+(rip->i_num-1)%MINIXSOURCECODEFile:servers/fs/inode.
c80723145V2_INODES_PER_BLOCK(sp->s_block_size);2314623147/*Dothereadorwrite.
*/23148if(rw_flag==WRITING){23149if(rip->i_update)update_times(rip);/*timesneedupdating*/23150if(sp->s_rd_only==FALSE)bp->b_dirt=DIRTY;23151}2315223153/*Copytheinodefromthediskblocktothein-coretableorviceversa.
23154*IfthefourthparameterbelowisFALSE,thebytesareswapped.
23155*/23156if(sp->s_version==V1)23157old_icopy(rip,dip,rw_flag,sp->s_native);23158else23159new_icopy(rip,dip2,rw_flag,sp->s_native);2316023161put_block(bp,INODE_BLOCK);23162rip->i_dirt=CLEAN;23163}2316523166*old_icopy*2316723168PRIVATEvoidold_icopy(rip,dip,direction,norm)23169registerstructinode*rip;/*pointertothein-coreinodestruct*/23170registerd1_inode*dip;/*pointertothed1_inodeinodestruct*/23171intdirection;/*READING(fromdisk)orWRITING(todisk)*/23172intnorm;/*TRUE=donotswapbytes;FALSE=swap*/2317323174{23175/*TheV1.
xIBMdisk,theV1.
x68000disk,andtheV2disk(sameforIBMand23176*68000)allhavedifferentinodelayouts.
Whenaninodeisreadorwritten23177*thisroutinehandlestheconversionssothattheinformationintheinode23178*tableisindependentofthediskstructurefromwhichtheinodecame.
23179*Theold_icopyroutinecopiestoandfromV1disks.
23180*/2318123182inti;2318323184if(direction==READING){23185/*CopyV1.
xinodetothein-coretable,swappingbytesifneedbe.
*/23186rip->i_mode=conv2(norm,(int)dip->d1_mode);23187rip->i_uid=conv2(norm,(int)dip->d1_uid);23188rip->i_size=conv4(norm,dip->d1_size);23189rip->i_mtime=conv4(norm,dip->d1_mtime);23190rip->i_atime=rip->i_mtime;23191rip->i_ctime=rip->i_mtime;23192rip->i_nlinks=dip->d1_nlinks;/*1char*/23193rip->i_gid=dip->d1_gid;/*1char*/23194rip->i_ndzones=V1_NR_DZONES;23195rip->i_nindirs=V1_INDIRECTS;23196for(i=0;ii_zone[i]=conv2(norm,(int)dip->d1_zone[i]);23198}else{23199/*CopyingV1.
xinodetodiskfromthein-coretable.
*/23200dip->d1_mode=conv2(norm,(int)rip->i_mode);23201dip->d1_uid=conv2(norm,(int)rip->i_uid);23202dip->d1_size=conv4(norm,rip->i_size);23203dip->d1_mtime=conv4(norm,rip->i_mtime);23204dip->d1_nlinks=rip->i_nlinks;/*1char*/808File:servers/fs/inode.
cMINIXSOURCECODE23205dip->d1_gid=rip->i_gid;/*1char*/23206for(i=0;id1_zone[i]=conv2(norm,(int)rip->i_zone[i]);23208}23209}2321123212*new_icopy*2321323214PRIVATEvoidnew_icopy(rip,dip,direction,norm)23215registerstructinode*rip;/*pointertothein-coreinodestruct*/23216registerd2_inode*dip;/*pointertothed2_inodestruct*/23217intdirection;/*READING(fromdisk)orWRITING(todisk)*/23218intnorm;/*TRUE=donotswapbytes;FALSE=swap*/2321923220{23221/*Sameasold_icopy,butto/fromV2disklayout.
*/2322223223inti;2322423225if(direction==READING){23226/*CopyV2.
xinodetothein-coretable,swappingbytesifneedbe.
*/23227rip->i_mode=conv2(norm,dip->d2_mode);23228rip->i_uid=conv2(norm,dip->d2_uid);23229rip->i_nlinks=conv2(norm,dip->d2_nlinks);23230rip->i_gid=conv2(norm,dip->d2_gid);23231rip->i_size=conv4(norm,dip->d2_size);23232rip->i_atime=conv4(norm,dip->d2_atime);23233rip->i_ctime=conv4(norm,dip->d2_ctime);23234rip->i_mtime=conv4(norm,dip->d2_mtime);23235rip->i_ndzones=V2_NR_DZONES;23236rip->i_nindirs=V2_INDIRECTS(rip->i_sp->s_block_size);23237for(i=0;ii_zone[i]=conv4(norm,(long)dip->d2_zone[i]);23239}else{23240/*CopyingV2.
xinodetodiskfromthein-coretable.
*/23241dip->d2_mode=conv2(norm,rip->i_mode);23242dip->d2_uid=conv2(norm,rip->i_uid);23243dip->d2_nlinks=conv2(norm,rip->i_nlinks);23244dip->d2_gid=conv2(norm,rip->i_gid);23245dip->d2_size=conv4(norm,rip->i_size);23246dip->d2_atime=conv4(norm,rip->i_atime);23247dip->d2_ctime=conv4(norm,rip->i_ctime);23248dip->d2_mtime=conv4(norm,rip->i_mtime);23249for(i=0;id2_zone[i]=conv4(norm,(long)rip->i_zone[i]);23251}23252}2325423255*dup_inode*2325623257PUBLICvoiddup_inode(ip)23258structinode*ip;/*Theinodetobeduplicated.
*/23259{23260/*Thisroutineisasimplifiedformofget_inode()forthecasewhere23261*theinodepointerisalreadyknown.
23262*/2326323264ip->i_count++;MINIXSOURCECODEFile:servers/fs/inode.
c80923265}servers/fs/super.
c23300/*Thisfilemanagesthesuperblocktableandtherelateddatastructures,23301*namely,thebitmapsthatkeeptrackofwhichzonesandwhichinodesare23302*allocatedandwhicharefree.
Whenanewinodeorzoneisneeded,the23303*appropriatebitmapissearchedforafreeentry.
23304*23305*Theentrypointsintothisfileare23306*alloc_bit:somebodywantstoallocateazoneorinode;findone23307*free_bit:indicatethatazoneorinodeisavailableforallocation23308*get_super:searchthe'superblock'tableforadevice23309*mounted:tellsiffileinodeisonmounted(orROOT)filesystem23310*read_super:readasuperblock23311*/2331223313#include"fs.
h"23314#include23315#include23316#include"buf.
h"23317#include"inode.
h"23318#include"super.
h"23319#include"const.
h"233202332123322*alloc_bit*2332323324PUBLICbit_talloc_bit(sp,map,origin)23325structsuper_block*sp;/*thefilesystemtoallocatefrom*/23326intmap;/*IMAP(inodemap)orZMAP(zonemap)*/23327bit_torigin;/*numberofbittostartsearchingat*/23328{23329/*Allocateabitfromabitmapandreturnitsbitnumber.
*/2333023331block_tstart_block;/*firstbitblock*/23332bit_tmap_bits;/*howmanybitsarethereinthebitmap*/23333unsignedbit_blocks;/*howmanyblocksarethereinthebitmap*/23334unsignedblock,word,bcount;23335structbuf*bp;23336bitchunk_t*wptr,*wlim,k;23337bit_ti,b;2333823339if(sp->s_rd_only)23340panic(__FILE__,"can'tallocatebitonread-onlyfilesys.
",NO_NUM);2334123342if(map==IMAP){23343start_block=START_BLOCK;23344map_bits=sp->s_ninodes+1;23345bit_blocks=sp->s_imap_blocks;23346}else{23347start_block=START_BLOCK+sp->s_imap_blocks;23348map_bits=sp->s_zones-(sp->s_firstdatazone-1);23349bit_blocks=sp->s_zmap_blocks;810File:servers/fs/super.
cMINIXSOURCECODE23350}2335123352/*Figureoutwheretostartthebitsearch(dependson'origin').
*/23353if(origin>=map_bits)origin=0;/*forrobustness*/2335423355/*Locatethestartingplace.
*/23356block=origin/FS_BITS_PER_BLOCK(sp->s_block_size);23357word=(origin%FS_BITS_PER_BLOCK(sp->s_block_size))/FS_BITCHUNK_BITS;2335823359/*Iterateoverallblocksplusone,becausewestartinthemiddle.
*/23360bcount=bit_blocks+1;23361do{23362bp=get_block(sp->s_dev,start_block+block,NORMAL);23363wlim=&bp->b_bitmap[FS_BITMAP_CHUNKS(sp->s_block_size)];2336423365/*Iterateoverthewordsinblock.
*/23366for(wptr=&bp->b_bitmap[word];wptrs_native,(int)*wptr);23373for(i=0;(k&(1s_block_size))23377+(wptr-&bp->b_bitmap[0])*FS_BITCHUNK_BITS23378+i;2337923380/*Don'tallocatebitsbeyondtheendofthemap.
*/23381if(b>=map_bits)break;2338223383/*Allocateandreturnbitnumber.
*/23384k|=1s_native,(int)k);23386bp->b_dirt=DIRTY;23387put_block(bp,MAP_BLOCK);23388return(b);23389}23390put_block(bp,MAP_BLOCK);23391if(++block>=bit_blocks)block=0;/*lastblock,wraparound*/23392word=0;23393}while(--bcount>0);23394return(NO_BIT);/*nobitcouldbeallocated*/23395}2339723398*free_bit*2339923400PUBLICvoidfree_bit(sp,map,bit_returned)23401structsuper_block*sp;/*thefilesystemtooperateon*/23402intmap;/*IMAP(inodemap)orZMAP(zonemap)*/23403bit_tbit_returned;/*numberofbittoinsertintothemap*/23404{23405/*Returnazoneorinodebyturningoffitsbitmapbit.
*/2340623407unsignedblock,word,bit;23408structbuf*bp;23409bitchunk_tk,mask;MINIXSOURCECODEFile:servers/fs/super.
c81123410block_tstart_block;2341123412if(sp->s_rd_only)23413panic(__FILE__,"can'tfreebitonread-onlyfilesys.
",NO_NUM);2341423415if(map==IMAP){23416start_block=START_BLOCK;23417}else{23418start_block=START_BLOCK+sp->s_imap_blocks;23419}23420block=bit_returned/FS_BITS_PER_BLOCK(sp->s_block_size);23421word=(bit_returned%FS_BITS_PER_BLOCK(sp->s_block_size))23422/FS_BITCHUNK_BITS;2342323424bit=bit_returned%FS_BITCHUNK_BITS;23425mask=1s_dev,start_block+block,NORMAL);2342823429k=conv2(sp->s_native,(int)bp->b_bitmap[word]);23430if(!
(k&mask)){23431panic(__FILE__,map==IMAP"triedtofreeunusedinode":23432"triedtofreeunusedblock",NO_NUM);23433}2343423435k&=mask;23436bp->b_bitmap[word]=conv2(sp->s_native,(int)k);23437bp->b_dirt=DIRTY;2343823439put_block(bp,MAP_BLOCK);23440}2344223443*get_super*2344423445PUBLICstructsuper_block*get_super(dev)23446dev_tdev;/*devicenumberwhosesuper_blockissought*/23447{23448/*Searchthesuperblocktableforthisdevice.
Itissupposedtobethere.
*/2344923450registerstructsuper_block*sp;2345123452if(dev==NO_DEV)23453panic(__FILE__,"requestforsuper_blockofNO_DEV",NO_NUM);2345423455for(sp=&super_block[0];sps_dev==dev)return(sp);2345723458/*Searchfailed.
Somethingwrong.
*/23459panic(__FILE__,"can'tfindsuperblockfordevice(indecimal)",(int)dev);2346023461return(NIL_SUPER);/*tokeepthecompilerandlintquiet*/23462}2346423465*get_block_size*2346623467PUBLICintget_block_size(dev_tdev)23468{23469/*Searchthesuperblocktableforthisdevice.
*/812File:servers/fs/super.
cMINIXSOURCECODE2347023471registerstructsuper_block*sp;2347223473if(dev==NO_DEV)23474panic(__FILE__,"requestforblocksizeofNO_DEV",NO_NUM);2347523476for(sp=&super_block[0];sps_dev==dev){23478return(sp->s_block_size);23479}23480}2348123482/*nomountedfilesystemusethisblocksizethen.
*/23483returnMIN_BLOCK_SIZE;23484}2348623487*mounted*2348823489PUBLICintmounted(rip)23490registerstructinode*rip;/*pointertoinode*/23491{23492/*Reportonwhetherthegiveninodeisonamounted(orROOT)filesystem.
*/2349323494registerstructsuper_block*sp;23495registerdev_tdev;2349623497dev=(dev_t)rip->i_zone[0];23498if(dev==root_dev)return(TRUE);/*inodeisonrootfilesystem*/2349923500for(sp=&super_block[0];sps_dev==dev)return(TRUE);2350223503return(FALSE);23504}2350623507*read_super*2350823509PUBLICintread_super(sp)23510registerstructsuper_block*sp;/*pointertoasuperblock*/23511{23512/*Readasuperblock.
*/23513dev_tdev;23514intmagic;23515intversion,native,r;23516staticcharsbbuf[MIN_BLOCK_SIZE];2351723518dev=sp->s_dev;/*savedevice(willbeoverwrittenbycopy)*/23519if(dev==NO_DEV)23520panic(__FILE__,"requestforsuper_blockofNO_DEV",NO_NUM);23521r=dev_io(DEV_READ,dev,FS_PROC_NR,23522sbbuf,SUPER_BLOCK_BYTES,MIN_BLOCK_SIZE,0);23523if(r!
=MIN_BLOCK_SIZE){23524returnEINVAL;23525}23526memcpy(sp,sbbuf,sizeof(*sp));23527sp->s_dev=NO_DEV;/*restorelater*/23528magic=sp->s_magic;/*determinesfilesystemtype*/23529MINIXSOURCECODEFile:servers/fs/super.
c81323530/*Getfilesystemversionandtype.
*/23531if(magic==SUPER_MAGIC||magic==conv2(BYTE_SWAP,SUPER_MAGIC)){23532version=V1;23533native=(magic==SUPER_MAGIC);23534}elseif(magic==SUPER_V2||magic==conv2(BYTE_SWAP,SUPER_V2)){23535version=V2;23536native=(magic==SUPER_V2);23537}elseif(magic==SUPER_V3){23538version=V3;23539native=1;23540}else{23541return(EINVAL);23542}2354323544/*Ifthesuperblockhasthewrongbyteorder,swapthefields;themagic23545*numberdoesn'tneedconversion.
*/23546sp->s_ninodes=conv4(native,sp->s_ninodes);23547sp->s_nzones=conv2(native,(int)sp->s_nzones);23548sp->s_imap_blocks=conv2(native,(int)sp->s_imap_blocks);23549sp->s_zmap_blocks=conv2(native,(int)sp->s_zmap_blocks);23550sp->s_firstdatazone=conv2(native,(int)sp->s_firstdatazone);23551sp->s_log_zone_size=conv2(native,(int)sp->s_log_zone_size);23552sp->s_max_size=conv4(native,sp->s_max_size);23553sp->s_zones=conv4(native,sp->s_zones);2355423555/*InV1,thedevicesizewaskeptinashort,s_nzones,whichlimited23556*devicesto32Kzones.
ForV2,itwasdecidedtokeepthesizeasa23557*long.
However,justchangings_nzonestoalongwouldnotwork,since23558*thenthepositionofs_magicinthesuperblockwouldnotbethesame23559*inV1andV2filesystems,andtherewouldbenowaytotellwhether23560*anewlymountedfilesystemwasV1orV2.
Thesolutionwastointroduce23561*anewvariable,s_zones,andcopythesizethere.
23562*23563*Calculatesomeothernumbersthatdependontheversionheretoo,to23564*hidesomeofthedifferences.
23565*/23566if(version==V1){23567sp->s_block_size=STATIC_BLOCK_SIZE;23568sp->s_zones=sp->s_nzones;/*onlyV1needsthiscopy*/23569sp->s_inodes_per_block=V1_INODES_PER_BLOCK;23570sp->s_ndzones=V1_NR_DZONES;23571sp->s_nindirs=V1_INDIRECTS;23572}else{23573if(version==V2)23574sp->s_block_size=STATIC_BLOCK_SIZE;23575if(sp->s_block_sizes_inodes_per_block=V2_INODES_PER_BLOCK(sp->s_block_size);23578sp->s_ndzones=V2_NR_DZONES;23579sp->s_nindirs=V2_INDIRECTS(sp->s_block_size);23580}2358123582if(sp->s_block_sizes_block_size>MAX_BLOCK_SIZE){23586printf("Filesystemblocksizeis%dkB;maximumfilesystem\n"23587"blocksizeis%dkB.
Thislimitcanbeincreasedbyrecompiling.
\n",23588sp->s_block_size/1024,MAX_BLOCK_SIZE/1024);23589returnEINVAL;814File:servers/fs/super.
cMINIXSOURCECODE23590}23591if((sp->s_block_size%512)!
=0){23592returnEINVAL;23593}23594if(SUPER_SIZE>sp->s_block_size){23595returnEINVAL;23596}23597if((sp->s_block_size%V2_INODE_SIZE)!
=0||23598(sp->s_block_size%V1_INODE_SIZE)!
=0){23599returnEINVAL;23600}2360123602sp->s_isearch=0;/*inodesearchesinitiallystartat0*/23603sp->s_zsearch=0;/*zonesearchesinitiallystartat0*/23604sp->s_version=version;23605sp->s_native=native;2360623607/*Makeafewbasiccheckstoseeifsuperblocklooksreasonable.
*/23608if(sp->s_imap_blockss_zmap_blockss_ninodess_zoness_log_zone_size>4){23611printf("notenoughimaporzonemapblocks,\n");23612printf("ornotenoughinodes,ornotenoughzones,"23613"orzonesizetoolarge\n");23614return(EINVAL);23615}23616sp->s_dev=dev;/*restoredevicenumber*/23617return(OK);23618}servers/fs/filedes.
c23700/*Thisfilecontainstheproceduresthatmanipulatefiledescriptors.
23701*23702*Theentrypointsintothisfileare23703*get_fd:lookforfreefiledescriptorandfreefilpslots23704*get_filp:lookupthefilpentryforagivenfiledescriptor23705*find_filp:findafilpslotthatpointstoagiveninode23706*/2370723708#include"fs.
h"23709#include"file.
h"23710#include"fproc.
h"23711#include"inode.
h"237122371323714*get_fd*2371523716PUBLICintget_fd(intstart,mode_tbits,int*k,structfilp**fpt)23717{23718/*Lookforafreefiledescriptorandafreefilpslot.
Fillinthemodeword23719*inthelatter,butdon'tclaimeitheroneyet,sincetheopen()orcreat()23720*mayyetfail.
23721*/2372223723registerstructfilp*f;23724registerinti;MINIXSOURCECODEFile:servers/fs/filedes.
c8152372523726*k=-1;/*weneedawaytotelliffiledescfound*/2372723728/*Searchthefprocfp_filptableforafreefiledescriptor.
*/23729for(i=start;ifp_filp[i]==NIL_FILP){23731/*Afiledescriptorhasbeenlocated.
*/23732*k=i;23733break;23734}23735}2373623737/*Checktoseeifafiledescriptorhasbeenfound.
*/23738if(*kfilp_count==0){23743f->filp_mode=bits;23744f->filp_pos=0L;23745f->filp_selectors=0;23746f->filp_select_ops=0;23747f->filp_pipe_select_ops=0;23748f->filp_flags=0;23749*fpt=f;23750return(OK);23751}23752}2375323754/*Ifcontrolpasseshere,thefilptablemustbefull.
Reportthatback.
*/23755return(ENFILE);23756}2375823759*get_filp*2376023761PUBLICstructfilp*get_filp(fild)23762intfild;/*filedescriptor*/23763{23764/*Seeif'fild'referstoavalidfiledescr.
Ifso,returnitsfilpptr.
*/2376523766err_code=EBADF;23767if(fild=OPEN_MAX)return(NIL_FILP);23768return(fp->fp_filp[fild]);/*mayalsobeNIL_FILP*/23769}2377123772*find_filp*2377323774PUBLICstructfilp*find_filp(registerstructinode*rip,mode_tbits)23775{23776/*Findafilpslotthatreferstotheinode'rip'inawayasdescribed23777*bythemodebit'bits'.
Usedfordeterminingwhethersomebodyisstill23778*interestedineitherendofapipe.
AlsousedwhenopeningaFIFOto23779*findpartnerstoshareafilpfieldwith(tosharedthefileposition).
23780*Like'get_fd'itperformsitsjobbylinearsearchthroughthefilptable.
23781*/2378223783registerstructfilp*f;23784816File:servers/fs/filedes.
cMINIXSOURCECODE23785for(f=&filp[0];ffilp_count!
=0&&f->filp_ino==rip&&(f->filp_mode&bits)){23787return(f);23788}23789}2379023791/*Ifcontrolpasseshere,thefilpwasn'tthere.
Reportthatback.
*/23792return(NIL_FILP);23793}servers/fs/lock.
c23800/*ThisfilehandlesadvisoryfilelockingasrequiredbyPOSIX.
23801*23802*Theentrypointsintothisfileare23803*lock_op:performlockingoperationsforFCNTLsystemcall23804*lock_revive:reviveprocesseswhenalockisreleased23805*/2380623807#include"fs.
h"23808#include23809#include23810#include23811#include"file.
h"23812#include"fproc.
h"23813#include"inode.
h"23814#include"lock.
h"23815#include"param.
h"238162381723818*lock_op*2381923820PUBLICintlock_op(f,req)23821structfilp*f;23822intreq;/*eitherF_SETLKorF_SETLKW*/23823{23824/*PerformtheadvisorylockingrequiredbyPOSIX.
*/2382523826intr,ltype,i,conflict=0,unlocking=0;23827mode_tmo;23828off_tfirst,last;23829structflockflock;23830vir_bytesuser_flock;23831structfile_lock*flp,*flp2,*empty;2383223833/*Fetchtheflockstructurefromuserspace.
*/23834user_flock=(vir_bytes)m_in.
name1;23835r=sys_datacopy(who,(vir_bytes)user_flock,23836FS_PROC_NR,(vir_bytes)&flock,(phys_bytes)sizeof(flock));23837if(r!
=OK)return(EINVAL);2383823839/*Makesomeerrorchecks.
*/23840ltype=flock.
l_type;23841mo=f->filp_mode;23842if(ltype!
=F_UNLCK&<ype!
=F_RDLCK&<ype!
=F_WRLCK)return(EINVAL);23843if(req==F_GETLK&<ype==F_UNLCK)return(EINVAL);23844if((f->filp_ino->i_mode&I_TYPE)!
=I_REGULAR)return(EINVAL);MINIXSOURCECODEFile:servers/fs/lock.
c81723845if(req!
=F_GETLK&<ype==F_RDLCK&&(mo&R_BIT)==0)return(EBADF);23846if(req!
=F_GETLK&<ype==F_WRLCK&&(mo&W_BIT)==0)return(EBADF);2384723848/*Computethefirstandlastbytesinthelockregion.
*/23849switch(flock.
l_whence){23850caseSEEK_SET:first=0;break;23851caseSEEK_CUR:first=f->filp_pos;break;23852caseSEEK_END:first=f->filp_ino->i_size;break;23853default:return(EINVAL);23854}23855/*Checkforoverflow.
*/23856if(((long)flock.
l_start>0)&&((first+flock.
l_start)first))23859return(EINVAL);23860first=first+flock.
l_start;23861last=first+flock.
l_len-1;23862if(flock.
l_len==0)last=MAX_FILE_POS;23863if(lastlock_type==0){23869if(empty==(structfile_lock*)0)empty=flp;23870continue;/*0meansunusedslot*/23871}23872if(flp->lock_inode!
=f->filp_ino)continue;/*differentfile*/23873if(lastlock_first)continue;/*newoneisinfront*/23874if(first>flp->lock_last)continue;/*newoneisafterwards*/23875if(ltype==F_RDLCK&&flp->lock_type==F_RDLCK)continue;23876if(ltype!
=F_UNLCK&&flp->lock_pid==fp->fp_pid)continue;2387723878/*Theremightbeaconflict.
Processit.
*/23879conflict=1;23880if(req==F_GETLK)break;2388123882/*Ifwearetryingtosetalock,itjustfailed.
*/23883if(ltype==F_RDLCK||ltype==F_WRLCK){23884if(req==F_SETLK){23885/*ForF_SETLK,justreportbackfailure.
*/23886return(EAGAIN);23887}else{23888/*ForF_SETLKW,suspendtheprocess.
*/23889suspend(XLOCK);23890return(SUSPEND);23891}23892}2389323894/*Weareclearingalockandwefoundsomethingthatoverlaps.
*/23895unlocking=1;23896if(firstlock_first&&last>=flp->lock_last){23897flp->lock_type=0;/*markslotasunused*/23898nr_locks--;/*numberoflocksisnow1less*/23899continue;23900}2390123902/*Partofalockedregionhasbeenunlocked.
*/23903if(firstlock_first){23904flp->lock_first=last+1;818File:servers/fs/lock.
cMINIXSOURCECODE23905continue;23906}2390723908if(last>=flp->lock_last){23909flp->lock_last=first-1;23910continue;23911}2391223913/*Badluck.
Alockhasbeensplitintwobyunlockingthemiddle.
*/23914if(nr_locks==NR_LOCKS)return(ENOLCK);23915for(i=0;ilock_type=flp->lock_type;23919flp2->lock_pid=flp->lock_pid;23920flp2->lock_inode=flp->lock_inode;23921flp2->lock_first=last+1;23922flp2->lock_last=flp->lock_last;23923flp->lock_last=first-1;23924nr_locks++;23925}23926if(unlocking)lock_revive();2392723928if(req==F_GETLK){23929if(conflict){23930/*GETLKandconflict.
Reportontheconflictinglock.
*/23931flock.
l_type=flp->lock_type;23932flock.
l_whence=SEEK_SET;23933flock.
l_start=flp->lock_first;23934flock.
l_len=flp->lock_last-flp->lock_first+1;23935flock.
l_pid=flp->lock_pid;2393623937}else{23938/*ItisGETLKandthereisnoconflict.
*/23939flock.
l_type=F_UNLCK;23940}2394123942/*Copytheflockstructurebacktothecaller.
*/23943r=sys_datacopy(FS_PROC_NR,(vir_bytes)&flock,23944who,(vir_bytes)user_flock,(phys_bytes)sizeof(flock));23945return(r);23946}2394723948if(ltype==F_UNLCK)return(OK);/*unlockedaregionwithnolocks*/2394923950/*Thereisnoconflict.
Ifspaceexists,storenewlockinthetable.
*/23951if(empty==(structfile_lock*)0)return(ENOLCK);/*tablefull*/23952empty->lock_type=ltype;23953empty->lock_pid=fp->fp_pid;23954empty->lock_inode=f->filp_ino;23955empty->lock_first=first;23956empty->lock_last=last;23957nr_locks++;23958return(OK);23959}MINIXSOURCECODEFile:servers/fs/lock.
c8192396123962*lock_revive*2396323964PUBLICvoidlock_revive()23965{23966/*Gofindalltheprocessesthatarewaitingforanykindoflockand23967*revivethemall.
Theonesthatarestillblockedwillblockagainwhen23968*theyrun.
Theotherswillcomplete.
Thisstrategyisaspace-time23969*tradeoff.
Figuringoutexactlywhichonestounblocknowwouldtake23970*extracode,andtheonlythingitwouldwinwouldbesomeperformancein23971*extremelyrarecircumstances(namely,thatsomebodyactuallyused23972*locking).
23973*/2397423975inttask;23976structfproc*fptr;2397723978for(fptr=&fproc[INIT_PROC_NR+1];fptrfp_task;23980if(fptr->fp_suspended==SUSPENDED&&task==XLOCK){23981revive((int)(fptr-fproc),0);23982}23983}23984}servers/fs/main.
c24000/*ThisfilecontainsthemainprogramoftheFileSystem.
Itconsistsof24001*aloopthatgetsmessagesrequestingwork,carriesoutthework,andsends24002*replies.
24003*24004*Theentrypointsintothisfileare:24005*main:mainprogramoftheFileSystem24006*reply:sendareplytoaprocessaftertherequestedworkisdone24007*24008*/2400924010structsuper_block;/*proto.
hneedstoknowthis*/2401124012#include"fs.
h"24013#include24014#include24015#include24016#include24017#include24018#include24019#include24020#include24021#include24022#include24023#include24024#include"buf.
h"24025#include"file.
h"24026#include"fproc.
h"24027#include"inode.
h"24028#include"param.
h"24029#include"super.
h"820File:servers/fs/main.
cMINIXSOURCECODE2403024031FORWARD_PROTOTYPE(voidfs_init,(void));24032FORWARD_PROTOTYPE(intigetenv,(char*var,intoptional));24033FORWARD_PROTOTYPE(voidget_work,(void));24034FORWARD_PROTOTYPE(voidload_ram,(void));24035FORWARD_PROTOTYPE(voidload_super,(Dev_tsuper_dev));240362403724038*main*2403924040PUBLICintmain()24041{24042/*Thisisthemainprogramofthefilesystem.
Themainloopconsistsof24043*threemajoractivities:gettingnewwork,processingthework,andsending24044*thereply.
Thisloopneverterminatesaslongasthefilesystemruns.
24045*/24046sigset_tsigset;24047interror;2404824049fs_init();2405024051/*Thisisthemainloopthatgetswork,processesit,andsendsreplies.
*/24052while(TRUE){24053get_work();/*setswhoandcall_nr*/2405424055fp=&fproc[who];/*pointertoproctablestruct*/24056super_user=(fp->fp_effuid==SU_UIDTRUE:FALSE);/*su*/2405724058/*Checkforspecialcontrolmessagesfirst.
*/24059if(call_nr==SYS_SIG){24060sigset=m_in.
NOTIFY_ARG;24061if(sigismember(&sigset,SIGKSTOP)){24062do_sync();24063sys_exit(0);/*neverreturns*/24064}24065}elseif(call_nr==SYN_ALARM){24066/*Notauserrequest;systemhasexpiredoneofourtimers,24067*currentlyonlyinuseforselect().
Checkit.
24068*/24069fs_expire_timers(m_in.
NOTIFY_TIMESTAMP);24070}elseif((call_nr&NOTIFY_MESSAGE)){24071/*Devicenotifiesusofanevent.
*/24072dev_status(&m_in);24073}else{24074/*Calltheinternalfunctionthatdoesthework.
*/24075if(call_nr=NCALLS){24076error=ENOSYS;24077printf("FS,warningillegal%dsystemcallby%d\n",call_nr,who);24078}elseif(fp->fp_pid==PID_FREE){24079error=ENOSYS;24080printf("FS,badprocess,who=%d,call_nr=%d,slot1=%d\n",24081who,call_nr,m_in.
slot1);24082}else{24083error=(*call_vec[call_nr])();24084}2408524086/*Copytheresultsbacktotheuserandsendreply.
*/24087if(error!
=SUSPEND){reply(who,error);}24088if(rdahed_inode!
=NIL_INODE){24089read_ahead();/*doblockreadahead*/MINIXSOURCECODEFile:servers/fs/main.
c82124090}24091}24092}24093return(OK);/*shouldn'tcomehere*/24094}2409624097*get_work*2409824099PRIVATEvoidget_work()24100{24101/*Normallywaitfornewinput.
However,if'reviving'is24102*nonzero,asuspendedprocessmustbeawakened.
24103*/24104registerstructfproc*rp;2410524106if(reviving!
=0){24107/*Reviveasuspendedprocess.
*/24108for(rp=&fproc[0];rpfp_revived==REVIVING){24110who=(int)(rp-fproc);24111call_nr=rp->fp_fd&BYTE;24112m_in.
fd=(rp->fp_fd>>8)&BYTE;24113m_in.
buffer=rp->fp_buffer;24114m_in.
nbytes=rp->fp_nbytes;24115rp->fp_suspended=NOT_SUSPENDED;/*nolongerhanging*/24116rp->fp_revived=NOT_REVIVING;24117reviving--;24118return;24119}24120panic(__FILE__,"get_workcouldn'treviveanyone",NO_NUM);24121}2412224123/*Normalcase.
Noonetorevive.
*/24124if(receive(ANY,&m_in)!
=OK)panic(__FILE__,"fsreceiveerror",NO_NUM);24125who=m_in.
m_source;24126call_nr=m_in.
m_type;24127}2412924130*buf_pool*2413124132PRIVATEvoidbuf_pool(void)24133{24134/*Initializethebufferpool.
*/2413524136registerstructbuf*bp;2413724138bufs_in_use=0;24139front=&buf[0];24140rear=&buf[NR_BUFS-1];2414124142for(bp=&buf[0];bpb_blocknr=NO_BLOCK;24144bp->b_dev=NO_DEV;24145bp->b_next=bp+1;24146bp->b_prev=bp-1;24147}24148buf[0].
b_prev=NIL_BUF;24149buf[NR_BUFS-1].
b_next=NIL_BUF;822File:servers/fs/main.
cMINIXSOURCECODE2415024151for(bp=&buf[0];bpb_hash=bp->b_next;24152buf_hash[0]=front;2415324154}2415624157*reply*2415824159PUBLICvoidreply(whom,result)24160intwhom;/*processtoreplyto*/24161intresult;/*resultofthecall(usuallyOKorerror#)*/24162{24163/*Sendareplytoauserprocess.
Itmayfail(iftheprocesshasjust24164*beenkilledbyasignal),sodon'tcheckthereturncode.
Ifthesend24165*fails,justignoreit.
24166*/24167ints;24168m_out.
reply_type=result;24169s=send(whom,&m_out);24170if(s!
=OK)printf("FS:couldn'tsendreply%d:%d\n",result,s);24171}2417324174*fs_init*2417524176PRIVATEvoidfs_init()24177{24178/*Initializeglobalvariables,tables,etc.
*/24179registerstructinode*rip;24180registerstructfproc*rfp;24181messagemess;24182ints;2418324184/*Initializetheprocesstablewithhelpoftheprocessmanagermessages.
24185*Expectonemessageforeachsystemprocesswithitsslotnumberandpid.
24186*Whennomoreprocessesfollow,themagicprocessnumberNONEissent.
24187*Then,stopandsynchronizewiththePM.
24188*/24189do{24190if(OK!
=(s=receive(PM_PROC_NR,&mess)))24191panic(__FILE__,"FScouldn'treceivefromPM",s);24192if(NONE==mess.
PR_PROC_NR)break;2419324194rfp=&fproc[mess.
PR_PROC_NR];24195rfp->fp_pid=mess.
PR_PID;24196rfp->fp_realuid=(uid_t)SYS_UID;24197rfp->fp_effuid=(uid_t)SYS_UID;24198rfp->fp_realgid=(gid_t)SYS_GID;24199rfp->fp_effgid=(gid_t)SYS_GID;24200rfp->fp_umask=0;2420124202}while(TRUE);/*continueuntilprocessNONE*/24203mess.
m_type=OK;/*tellPMthatwesucceeded*/24204s=send(PM_PROC_NR,&mess);/*sendsynchronizationmessage*/2420524206/*Allprocesstableentrieshavebeenset.
ContinuewithFSinitialization.
24207*Certainrelationsmustholdforthefilesystemtoworkatall.
Some24208*extrablock_sizerequirementsarecheckedatsuper-block-read-intime.
24209*/MINIXSOURCECODEFile:servers/fs/main.
c82324210if(OPEN_MAX>127)panic(__FILE__,"OPEN_MAX>127",NO_NUM);24211if(NR_BUFS8*sizeof(long))24215panic(__FILE__,"Toofewbitsinfp_cloexec",NO_NUM);2421624217/*Thefollowinginitializationsareneededtoletdev_opclsucceed.
*/24218fp=(structfproc*)NULL;24219who=FS_PROC_NR;2422024221buf_pool();/*initializebufferpool*/24222build_dmap();/*builddevicetableandmapbootdriver*/24223load_ram();/*initRAMdisk,loadifitisroot*/24224load_super(root_dev);/*loadsuperblockforrootdevice*/24225init_select();/*initselect()structures*/2422624227/*Therootdevicecannowbeaccessed;setprocessdirectories.
*/24228for(rfp=&fproc[0];rfpfp_pid!
=PID_FREE){24230rip=get_inode(root_dev,ROOT_INODE);24231dup_inode(rip);24232rfp->fp_rootdir=rip;24233rfp->fp_workdir=rip;24234}24235}24236}2423824239*igetenv*2424024241PRIVATEintigetenv(key,optional)24242char*key;24243intoptional;24244{24245/*Askkernelforanintegervaluedbootenvironmentvariable.
*/24246charvalue[64];24247inti;2424824249if((i=env_get_param(key,value,sizeof(value)))!
=OK){24250if(!
optional)24251printf("FS:Warning,couldn'tgetmonitorparam:%d\n",i);24252return0;24253}24254return(atoi(value));24255}2425724258*load_ram*2425924260PRIVATEvoidload_ram(void)24261{24262/*AllocateaRAMdiskwithsizegiveninthebootparameters.
IfaRAMdisk24263*imageisgiven,thecopytheentireimagedeviceblock-by-blocktoaRAM24264*diskwiththesamesizeastheimage.
24265*Iftherootdeviceisnotset,theRAMdiskwillbeusedasrootinstead.
24266*/24267registerstructbuf*bp,*bp1;24268u32_tlcount,ram_size_kb;24269zone_tzones;824File:servers/fs/main.
cMINIXSOURCECODE24270structsuper_block*sp,*dsp;24271block_tb;24272Dev_timage_dev;24273staticcharsbbuf[MIN_BLOCK_SIZE];24274intblock_size_image,block_size_ram,ramfs_block_size;24275ints;2427624277/*Getsomebootenvironmentvariables.
*/24278root_dev=igetenv("rootdev",0);24279image_dev=igetenv("ramimagedev",0);24280ram_size_kb=igetenv("ramsize",0);2428124282/*Opentherootdevice.
*/24283if(dev_open(root_dev,FS_PROC_NR,R_BIT|W_BIT)!
=OK)24284panic(__FILE__,"Cannotopenrootdevice",NO_NUM);2428524286/*Ifwemustinitializearamdisk,getdetailsfromtheimagedevice.
*/24287if(root_dev==DEV_RAM){24288u32_tfsmax,probedev;2428924290/*IfwearerunningfromCD,seeifwecanfindit.
*/24291if(igetenv("cdproberoot",1)&&(probedev=cdprobe())!
=NO_DEV){24292chardevnum[10];24293structsysgetenvenv;2429424295/*Ifso,thisisournewRAMimagedevice.
*/24296image_dev=probedev;2429724298/*TellPMaboutit,souserlandcanfindoutaboutit24299*withsysenvinterface.
24300*/24301env.
key="cdproberoot";24302env.
keylen=strlen(env.
key);24303sprintf(devnum,"%d",(int)probedev);24304env.
val=devnum;24305env.
vallen=strlen(devnum);24306svrctl(MMSETPARAM,&env);24307}2430824309/*OpenimagedeviceforRAMroot.
*/24310if(dev_open(image_dev,FS_PROC_NR,R_BIT)!
=OK)24311panic(__FILE__,"CannotopenRAMimagedevice",NO_NUM);2431224313/*GetsizeofRAMdiskimagefromthesuperblock.
*/24314sp=&super_block[0];24315sp->s_dev=image_dev;24316if(read_super(sp)!
=OK)24317panic(__FILE__,"BadRAMdiskimageFS",NO_NUM);2431824319lcount=sp->s_zoness_log_zone_size;/*#blksonrootdev*/2432024321/*StretchtheRAMdiskfilesystemtothebootparameterssize,but24322*nofurtherthanthelastzonebitmapblockallows.
24323*/24324if(ram_size_kb*1024s_block_size)24325ram_size_kb=lcount*sp->s_block_size/1024;24326fsmax=(u32_t)sp->s_zmap_blocks*CHAR_BIT*sp->s_block_size;24327fsmax=(fsmax+(sp->s_firstdatazone-1))s_log_zone_size;24328if(ram_size_kb*1024>fsmax*sp->s_block_size)24329ram_size_kb=fsmax*sp->s_block_size/1024;MINIXSOURCECODEFile:servers/fs/main.
c82524330}2433124332/*TellRAMdriverhowbigtheRAMdiskmustbe.
*/24333m_out.
m_type=DEV_IOCTL;24334m_out.
PROC_NR=FS_PROC_NR;24335m_out.
DEVICE=RAM_DEV;24336m_out.
REQUEST=MIOCRAMSIZE;/*I/Ocontroltouse*/24337m_out.
POSITION=(ram_size_kb*1024);/*requestinbytes*/24338if((s=sendrec(MEM_PROC_NR,&m_out))!
=OK)24339panic("FS","sendrecfromMEMfailed",s);24340elseif(m_out.
REP_STATUS!
=OK){24341/*Reportandcontinue,unlessRAMdiskisrequiredasrootFS.
*/24342if(root_dev!
=DEV_RAM){24343report("FS","can'tsetRAMdisksize",m_out.
REP_STATUS);24344return;24345}else{24346panic(__FILE__,"can'tsetRAMdisksize",m_out.
REP_STATUS);24347}24348}2434924350/*SeeifwemustloadtheRAMdiskimage,otherwisereturn.
*/24351if(root_dev!
=DEV_RAM)24352return;2435324354/*CopytheblocksoneatatimefromtheimagetotheRAMdisk.
*/24355printf("LoadingRAMdiskonto/dev/ram:\33[23CLoaded:0KB");2435624357inode[0].
i_mode=I_BLOCK_SPECIAL;/*tempinodeforrahead()*/24358inode[0].
i_size=LONG_MAX;24359inode[0].
i_dev=image_dev;24360inode[0].
i_zone[0]=image_dev;2436124362block_size_ram=get_block_size(DEV_RAM);24363block_size_image=get_block_size(image_dev);2436424365/*RAMblocksizehastobeamultipleoftherootimageblock24366*sizetomakecopyingeasier.
24367*/24368if(block_size_image%block_size_ram){24369printf("\nramblocksize:%dimageblocksize:%d\n",24370block_size_ram,block_size_image);24371panic(__FILE__,"ramdiskblocksizemustbeamultipleof"24372"theimagediskblocksize",NO_NUM);24373}2437424375/*Loadingblocksfromimagedevice.
*/24376for(b=0;bb_data,bp->b_data+rb*block_size_ram,24383(size_t)block_size_ram);24384bp1->b_dirt=DIRTY;24385put_block(bp1,FULL_DATA_BLOCK);24386}24387put_block(bp,FULL_DATA_BLOCK);24388if(b%11==0)24389printf("\b\b\b\b\b\b\b\b\b%6ldKB",((long)b*block_size_image)/1024L);826File:servers/fs/main.
cMINIXSOURCECODE24390}2439124392/*CommitchangestoRAMsodev_iowillseeit.
*/24393do_sync();2439424395printf("\rRAMdiskof%uKBloadedonto/dev/ram.
",(unsigned)ram_size_kb);24396if(root_dev==DEV_RAM)printf("UsingRAMdiskasrootFS.
");24397printf("\n");2439824399/*Invalidateandclosetheimagedevice.
*/24400invalidate(image_dev);24401dev_close(image_dev);2440224403/*ResizetheRAMdiskrootfilesystem.
*/24404if(dev_io(DEV_READ,root_dev,FS_PROC_NR,24405sbbuf,SUPER_BLOCK_BYTES,MIN_BLOCK_SIZE,0)!
=MIN_BLOCK_SIZE){24406printf("WARNING:ramdiskreadforresizingfailed\n");24407}24408dsp=(structsuper_block*)sbbuf;24409if(dsp->s_magic==SUPER_V3)24410ramfs_block_size=dsp->s_block_size;24411else24412ramfs_block_size=STATIC_BLOCK_SIZE;24413zones=(ram_size_kb*1024/ramfs_block_size)>>sp->s_log_zone_size;2441424415dsp->s_nzones=conv2(sp->s_native,(u16_t)zones);24416dsp->s_zones=conv4(sp->s_native,zones);24417if(dev_io(DEV_WRITE,root_dev,FS_PROC_NR,24418sbbuf,SUPER_BLOCK_BYTES,MIN_BLOCK_SIZE,0)!
=MIN_BLOCK_SIZE){24419printf("WARNING:ramdiskwriteforresizingfailed\n");24420}24421}2442324424*load_super*2442524426PRIVATEvoidload_super(super_dev)24427dev_tsuper_dev;/*placetogetsuperblockfrom*/24428{24429intbad;24430registerstructsuper_block*sp;24431registerstructinode*rip;2443224433/*Initializethesuper_blocktable.
*/24434for(sp=&super_block[0];sps_dev=NO_DEV;2443624437/*Readinsuper_blockfortherootfilesystem.
*/24438sp=&super_block[0];24439sp->s_dev=super_dev;2444024441/*Checksuper_blockforconsistency.
*/24442bad=(read_super(sp)!
=OK);24443if(!
bad){24444rip=get_inode(super_dev,ROOT_INODE);/*inodeforrootdir*/24445if((rip->i_mode&I_TYPE)!
=I_DIRECTORY||rip->i_nlinkss_imount=rip;MINIXSOURCECODEFile:servers/fs/main.
c82724450dup_inode(rip);24451sp->s_isup=rip;24452sp->s_rd_only=0;24453return;24454}servers/fs/open.
c24500/*Thisfilecontainstheproceduresforcreating,opening,closing,and24501*seekingonfiles.
24502*24503*Theentrypointsintothisfileare24504*do_creat:performtheCREATsystemcall24505*do_open:performtheOPENsystemcall24506*do_mknod:performtheMKNODsystemcall24507*do_mkdir:performtheMKDIRsystemcall24508*do_close:performtheCLOSEsystemcall24509*do_lseek:performtheLSEEKsystemcall24510*/2451124512#include"fs.
h"24513#include24514#include24515#include24516#include24517#include"buf.
h"24518#include"file.
h"24519#include"fproc.
h"24520#include"inode.
h"24521#include"lock.
h"24522#include"param.
h"24523#include"super.
h"2452424525#defineoffsetm2_l12452624527PRIVATEcharmode_map[]={R_BIT,W_BIT,R_BIT|W_BIT,0};2452824529FORWARD_PROTOTYPE(intcommon_open,(intoflags,mode_tomode));24530FORWARD_PROTOTYPE(intpipe_open,(structinode*rip,mode_tbits,intoflags));24531FORWARD_PROTOTYPE(structinode*new_node,(char*path,mode_tbits,24532zone_tz0));245332453424535*do_creat*2453624537PUBLICintdo_creat()24538{24539/*Performthecreat(name,mode)systemcall.
*/24540intr;2454124542if(fetch_name(m_in.
name,m_in.
name_length,M3)!
=OK)return(err_code);24543r=common_open(O_WRONLY|O_CREAT|O_TRUNC,(mode_t)m_in.
mode);24544return(r);24545}828File:servers/fs/open.
cMINIXSOURCECODE2454724548*do_open*2454924550PUBLICintdo_open()24551{24552/*Performtheopen(name,flags,.
.
.
)systemcall.
*/2455324554intcreate_mode=0;/*isreallymode_tbutthisgivesproblems*/24555intr;2455624557/*IfO_CREATisset,openhasthreeparameters,otherwisetwo.
*/24558if(m_in.
mode&O_CREAT){24559create_mode=m_in.
c_mode;24560r=fetch_name(m_in.
c_name,m_in.
name1_length,M1);24561}else{24562r=fetch_name(m_in.
name,m_in.
name_length,M3);24563}2456424565if(r!
=OK)return(err_code);/*namewasbad*/24566r=common_open(m_in.
mode,create_mode);24567return(r);24568}2457024571*common_open*2457224573PRIVATEintcommon_open(registerintoflags,mode_tomode)24574{24575/*Commoncodefromdo_creatanddo_open.
*/2457624577registerstructinode*rip;24578intr,b,exist=TRUE;24579dev_tdev;24580mode_tbits;24581off_tpos;24582structfilp*fil_ptr,*filp2;2458324584/*Remapthebottomtwobitsofoflags.
*/24585bits=(mode_t)mode_map[oflags&O_ACCMODE];2458624587/*Seeiffiledescriptorandfilpslotsareavailable.
*/24588if((r=get_fd(0,bits,&m_in.
fd,&fil_ptr))!
=OK)return(r);2458924590/*IfO_CREATEisset,trytomakethefile.
*/24591if(oflags&O_CREAT){24592/*Createanewinodebycallingnew_node().
*/24593omode=I_REGULAR|(omode&ALL_MODES&fp->fp_umask);24594rip=new_node(user_path,omode,NO_ZONE);24595r=err_code;24596if(r==OK)exist=FALSE;/*wejustcreatedthefile*/24597elseif(r!
=EEXIST)return(r);/*othererror*/24598elseexist=!
(oflags&O_EXCL);/*fileexists,iftheO_EXCL24599flagissetthisisanerror*/24600}else{24601/*Scanpathname.
*/24602if((rip=eat_path(user_path))==NIL_INODE)return(err_code);24603}2460424605/*Claimthefiledescriptorandfilpslotandfillthemin.
*/24606fp->fp_filp[m_in.
fd]=fil_ptr;MINIXSOURCECODEFile:servers/fs/open.
c82924607fil_ptr->filp_count=1;24608fil_ptr->filp_ino=rip;24609fil_ptr->filp_flags=oflags;2461024611/*Onlydothenormalopencodeifwedidn'tjustcreatethefile.
*/24612if(exist){24613/*Checkprotections.
*/24614if((r=forbidden(rip,bits))==OK){24615/*Openingreg.
filesdirectoriesandspecialfilesdiffer.
*/24616switch(rip->i_mode&I_TYPE){24617caseI_REGULAR:24618/*TruncateregularfileifO_TRUNC.
*/24619if(oflags&O_TRUNC){24620if((r=forbidden(rip,W_BIT))!
=OK)break;24621truncate(rip);24622wipe_inode(rip);24623/*Sendtheinodefromtheinodecachetothe24624*blockcache,soitgetswrittenonthenext24625*cacheflush.
24626*/24627rw_inode(rip,WRITING);24628}24629break;2463024631caseI_DIRECTORY:24632/*Directoriesmaybereadbutnotwritten.
*/24633r=(bits&W_BITEISDIR:OK);24634break;2463524636caseI_CHAR_SPECIAL:24637caseI_BLOCK_SPECIAL:24638/*Invokethedriverforspecialprocessing.
*/24639dev=(dev_t)rip->i_zone[0];24640r=dev_open(dev,who,bits|(oflags&O_ACCMODE));24641break;2464224643caseI_NAMED_PIPE:24644oflags|=O_APPEND;/*forceappendmode*/24645fil_ptr->filp_flags=oflags;24646r=pipe_open(rip,bits,oflags);24647if(r!
=ENXIO){24648/*Seeifsomeoneelseisdoingardorwton24649*theFIFO.
Ifso,useitsfilpentrysothe24650*filepositionwillbeautomaticallyshared.
24651*/24652b=(bits&R_BITR_BIT:W_BIT);24653fil_ptr->filp_count=0;/*don'tfindself*/24654if((filp2=find_filp(rip,b))!
=NIL_FILP){24655/*Co-readerorwriterfound.
Useit.
*/24656fp->fp_filp[m_in.
fd]=filp2;24657filp2->filp_count++;24658filp2->filp_ino=rip;24659filp2->filp_flags=oflags;2466024661/*i_countwasincrementedincorrectly24662*byeatpathabove,notknowingthat24663*weweregoingtouseanexisting24664*filpentry.
Correctthiserror.
24665*/24666rip->i_count--;830File:servers/fs/open.
cMINIXSOURCECODE24667}else{24668/*Nobodyelsefound.
Restorefilp.
*/24669fil_ptr->filp_count=1;24670if(b==R_BIT)24671pos=rip->i_zone[V2_NR_DZONES+0];24672else24673pos=rip->i_zone[V2_NR_DZONES+1];24674fil_ptr->filp_pos=pos;24675}24676}24677break;24678}24679}24680}2468124682/*Iferror,releaseinode.
*/24683if(r!
=OK){24684if(r==SUSPEND)return(r);/*Oops,justsuspended*/24685fp->fp_filp[m_in.
fd]=NIL_FILP;24686fil_ptr->filp_count=0;24687put_inode(rip);24688return(r);24689}2469024691return(m_in.
fd);24692}2469424695*new_node*2469624697PRIVATEstructinode*new_node(char*path,mode_tbits,zone_tz0)24698{24699/*New_node()iscalledbycommon_open(),do_mknod(),anddo_mkdir().
24700*Inallcasesitallocatesanewinode,makesadirectoryentryforiton24701*thepath'path',andinitializesit.
Itreturnsapointertotheinodeif24702*itcandothis;otherwiseitreturnsNIL_INODE.
Italwayssets'err_code'24703*toanappropriatevalue(OKoranerrorcode).
24704*/2470524706registerstructinode*rlast_dir_ptr,*rip;24707registerintr;24708charstring[NAME_MAX];2470924710/*Seeifthepathcanbeopeneddowntothelastdirectory.
*/24711if((rlast_dir_ptr=last_dir(path,string))==NIL_INODE)return(NIL_INODE);2471224713/*Thefinaldirectoryisaccessible.
Getfinalcomponentofthepath.
*/24714rip=advance(rlast_dir_ptr,string);24715if(rip==NIL_INODE&&err_code==ENOENT){24716/*Lastpathcomponentdoesnotexist.
Makenewdirectoryentry.
*/24717if((rip=alloc_inode(rlast_dir_ptr->i_dev,bits))==NIL_INODE){24718/*Can'tcreatnewinode:outofinodes.
*/24719put_inode(rlast_dir_ptr);24720return(NIL_INODE);24721}2472224723/*Forceinodetothediskbeforemakingdirectoryentrytomake24724*thesystemmorerobustinthefaceofacrash:aninodewith24725*nodirectoryentryismuchbetterthantheopposite.
24726*/MINIXSOURCECODEFile:servers/fs/open.
c83124727rip->i_nlinks++;24728rip->i_zone[0]=z0;/*major/minordevicenumbers*/24729rw_inode(rip,WRITING);/*forceinodetodisknow*/2473024731/*Newinodeacquired.
Trytomakedirectoryentry.
*/24732if((r=search_dir(rlast_dir_ptr,string,&rip->i_num,ENTER))!
=OK){24733put_inode(rlast_dir_ptr);24734rip->i_nlinks--;/*pity,havetofreediskinode*/24735rip->i_dirt=DIRTY;/*dirtyinodesarewrittenout*/24736put_inode(rip);/*thiscallfreestheinode*/24737err_code=r;24738return(NIL_INODE);24739}2474024741}else{24742/*Eitherlastcomponentexists,orthereissomeproblem.
*/24743if(rip!
=NIL_INODE)24744r=EEXIST;24745else24746r=err_code;24747}2474824749/*Returnthedirectoryinodeandexit.
*/24750put_inode(rlast_dir_ptr);24751err_code=r;24752return(rip);24753}2475524756*pipe_open*2475724758PRIVATEintpipe_open(registerstructinode*rip,registermode_tbits,24759registerintoflags)24760{24761/*Thisfunctioniscalledfromcommon_open.
Itchecksif24762*thereisatleastonereader/writerpairforthepipe,ifnot24763*itsuspendsthecaller,otherwiseitrevivesallotherblocked24764*processeshangingonthepipe.
24765*/2476624767rip->i_pipe=I_PIPE;24768if(find_filp(rip,bits&W_BITR_BIT:W_BIT)==NIL_FILP){24769if(oflags&O_NONBLOCK){24770if(bits&W_BIT)return(ENXIO);24771}else{24772suspend(XPOPEN);/*suspendcaller*/24773return(SUSPEND);24774}24775}elseif(susp_count>0){/*reviveblockedprocesses*/24776release(rip,OPEN,susp_count);24777release(rip,CREAT,susp_count);24778}24779return(OK);24780}2478224783*do_mknod*2478424785PUBLICintdo_mknod()24786{832File:servers/fs/open.
cMINIXSOURCECODE24787/*Performthemknod(name,mode,addr)systemcall.
*/2478824789registermode_tbits,mode_bits;24790structinode*ip;2479124792/*Onlythesuper_usermaymakenodesotherthanfifos.
*/24793mode_bits=(mode_t)m_in.
mk_mode;/*modeoftheinode*/24794if(!
super_user&&((mode_bits&I_TYPE)!
=I_NAMED_PIPE))return(EPERM);24795if(fetch_name(m_in.
name1,m_in.
name1_length,M1)!
=OK)return(err_code);24796bits=(mode_bits&I_TYPE)|(mode_bits&ALL_MODES&fp->fp_umask);24797ip=new_node(user_path,bits,(zone_t)m_in.
mk_z0);24798put_inode(ip);24799return(err_code);24800}2480224803*do_mkdir*2480424805PUBLICintdo_mkdir()24806{24807/*Performthemkdir(name,mode)systemcall.
*/2480824809intr1,r2;/*statuscodes*/24810ino_tdot,dotdot;/*inodenumbersfor.
and.
.
*/24811mode_tbits;/*modebitsforthenewinode*/24812charstring[NAME_MAX];/*lastcomponentofthenewdir'spathname*/24813registerstructinode*rip,*ldirp;2481424815/*Checktoseeifitispossibletomakeanotherlinkintheparentdir.
*/24816if(fetch_name(m_in.
name1,m_in.
name1_length,M1)!
=OK)return(err_code);24817ldirp=last_dir(user_path,string);/*pointertonewdir'sparent*/24818if(ldirp==NIL_INODE)return(err_code);24819if(ldirp->i_nlinks>=(ldirp->i_sp->s_version==V124820CHAR_MAX:SHRT_MAX)){24821put_inode(ldirp);/*returnparent*/24822return(EMLINK);24823}2482424825/*Nextmaketheinode.
Ifthatfails,returnerrorcode.
*/24826bits=I_DIRECTORY|(m_in.
mode&RWX_MODES&fp->fp_umask);24827rip=new_node(user_path,bits,(zone_t)0);24828if(rip==NIL_INODE||err_code==EEXIST){24829put_inode(rip);/*can'tmakedir:italreadyexists*/24830put_inode(ldirp);/*returnparenttoo*/24831return(err_code);24832}2483324834/*Gettheinodenumbersfor.
and.
.
toenterinthedirectory.
*/24835dotdot=ldirp->i_num;/*parent'sinodenumber*/24836dot=rip->i_num;/*inodenumberofthenewdiritself*/2483724838/*Nowmakedirentriesfor.
and.
.
unlessthediskiscompletelyfull.
*/24839/*Usedot1anddot2,sothemodeofthedirectoryisn'timportant.
*/24840rip->i_mode=bits;/*setmode*/24841r1=search_dir(rip,dot1,&dot,ENTER);/*enter.
inthenewdir*/24842r2=search_dir(rip,dot2,&dotdot,ENTER);/*enter.
.
inthenewdir*/2484324844/*Ifboth.
and.
.
weresuccessfullyentered,incrementthelinkcounts.
*/24845if(r1==OK&&r2==OK){24846/*Normalcase.
Itwaspossibletoenter.
and.
.
inthenewdir.
*/MINIXSOURCECODEFile:servers/fs/open.
c83324847rip->i_nlinks++;/*thisaccountsfor.
*/24848ldirp->i_nlinks++;/*thisaccountsfor.
.
*/24849ldirp->i_dirt=DIRTY;/*markparent'sinodeasdirty*/24850}else{24851/*Itwasnotpossibletoenter.
or.
.
probablydiskwasfull.
*/24852(void)search_dir(ldirp,string,(ino_t*)0,DELETE);24853rip->i_nlinks--;/*undotheincrementdoneinnew_node()*/24854}24855rip->i_dirt=DIRTY;/*eitherway,i_nlinkshaschanged*/2485624857put_inode(ldirp);/*returntheinodeoftheparentdir*/24858put_inode(rip);/*returntheinodeofthenewlymadedir*/24859return(err_code);/*new_node()alwayssets'err_code'*/24860}2486224863*do_close*2486424865PUBLICintdo_close()24866{24867/*Performtheclose(fd)systemcall.
*/2486824869registerstructfilp*rfilp;24870registerstructinode*rip;24871structfile_lock*flp;24872intrw,mode_word,lock_count;24873dev_tdev;2487424875/*Firstlocatetheinodethatbelongstothefiledescriptor.
*/24876if((rfilp=get_filp(m_in.
fd))==NIL_FILP)return(err_code);24877rip=rfilp->filp_ino;/*'rip'pointstotheinode*/2487824879if(rfilp->filp_count-1==0&&rfilp->filp_mode!
=FILP_CLOSED){24880/*Checktoseeifthefileisspecial.
*/24881mode_word=rip->i_mode&I_TYPE;24882if(mode_word==I_CHAR_SPECIAL||mode_word==I_BLOCK_SPECIAL){24883dev=(dev_t)rip->i_zone[0];24884if(mode_word==I_BLOCK_SPECIAL){24885/*Invalidatecacheentriesunlessspecialismounted24886*orROOT24887*/24888if(!
mounted(rip)){24889(void)do_sync();/*purgecache*/24890invalidate(dev);24891}24892}24893/*Doanyspecialprocessingondeviceclose.
*/24894dev_close(dev);24895}24896}2489724898/*Iftheinodebeingclosedisapipe,releaseeveryonehangingonit.
*/24899if(rip->i_pipe==I_PIPE){24900rw=(rfilp->filp_mode&R_BITWRITE:READ);24901release(rip,rw,NR_PROCS);24902}2490324904/*Ifawritehasbeendone,theinodeisalreadymarkedasDIRTY.
*/24905if(--rfilp->filp_count==0){24906if(rip->i_pipe==I_PIPE&&rip->i_count>1){834File:servers/fs/open.
cMINIXSOURCECODE24907/*Savethefilepositioninthei-nodeincaseneededlater.
24908*Thereadandwritepositionsaresavedseparately.
The24909*last3zonesinthei-nodearenotusedfor(named)pipes.
24910*/24911if(rfilp->filp_mode==R_BIT)24912rip->i_zone[V2_NR_DZONES+0]=(zone_t)rfilp->filp_pos;24913else24914rip->i_zone[V2_NR_DZONES+1]=(zone_t)rfilp->filp_pos;24915}24916put_inode(rip);24917}2491824919fp->fp_cloexec&=(1Lfp_filp[m_in.
fd]=NIL_FILP;2492124922/*Checktoseeifthefileislocked.
Ifso,releasealllocks.
*/24923if(nr_locks==0)return(OK);24924lock_count=nr_locks;/*savecountoflocks*/24925for(flp=&file_lock[0];flplock_type==0)continue;/*slotnotinuse*/24927if(flp->lock_inode==rip&&flp->lock_pid==fp->fp_pid){24928flp->lock_type=0;24929nr_locks--;24930}24931}24932if(nr_locksfilp_ino->i_pipe==I_PIPE)return(ESPIPE);2495124952/*Thevalueof'whence'determinesthestartpositiontouse.
*/24953switch(m_in.
whence){24954case0:pos=0;break;24955case1:pos=rfilp->filp_pos;break;24956case2:pos=rfilp->filp_ino->i_size;break;24957default:return(EINVAL);24958}2495924960/*Checkforoverflow.
*/24961if(((long)m_in.
offset>0)&&((long)(pos+m_in.
offset)(long)pos))24964return(EINVAL);24965pos=pos+m_in.
offset;24966MINIXSOURCECODEFile:servers/fs/open.
c83524967if(pos!
=rfilp->filp_pos)24968rfilp->filp_ino->i_seek=ISEEK;/*inhibitreadahead*/24969rfilp->filp_pos=pos;24970m_out.
reply_l1=pos;/*insertthelongintotheoutputmessage*/24971return(OK);24972}servers/fs/read.
c25000/*Thisfilecontainstheheartofthemechanismusedtoread(andwrite)25001*files.
Readandwriterequestsaresplitupintochunksthatdonotcross25002*blockboundaries.
Eachchunkisthenprocessedinturn.
Readsonspecial25003*filesarealsodetectedandhandled.
25004*25005*Theentrypointsintothisfileare25006*do_read:performtheREADsystemcallbycallingread_write25007*read_write:actuallydotheworkofREADandWRITE25008*read_map:givenaninodeandfileposition,lookupitszonenumber25009*rd_indir:readanentryinanindirectblock25010*read_ahead:managetheblockreadaheadbusiness25011*/2501225013#include"fs.
h"25014#include25015#include25016#include"buf.
h"25017#include"file.
h"25018#include"fproc.
h"25019#include"inode.
h"25020#include"param.
h"25021#include"super.
h"2502225023FORWARD_PROTOTYPE(intrw_chunk,(structinode*rip,off_tposition,25024unsignedoff,intchunk,unsignedleft,intrw_flag,25025char*buff,intseg,intusr,intblock_size,int*completed));250262502725028*do_read*2502925030PUBLICintdo_read()25031{25032return(read_write(READING));25033}2503525036*read_write*2503725038PUBLICintread_write(rw_flag)25039intrw_flag;/*READINGorWRITING*/25040{25041/*Performread(fd,buffer,nbytes)orwrite(fd,buffer,nbytes)call.
*/2504225043registerstructinode*rip;25044registerstructfilp*f;836File:servers/fs/read.
cMINIXSOURCECODE25045off_tbytes_left,f_size,position;25046unsignedintoff,cum_io;25047intop,oflags,r,chunk,usr,seg,block_spec,char_spec;25048intregular,partial_pipe=0,partial_cnt=0;25049mode_tmode_word;25050structfilp*wf;25051intblock_size;25052intcompleted,r2=OK;25053phys_bytesp;2505425055/*leftunfinishedrw_chunk()sfrompreviouscall!
thiscan'thappen.
25056*itmeanssomethinghasgonewrongwecan'trepairnow.
25057*/25058if(bufs_in_use>7;25065seg=(m_in.
fd>>5)&03;25066m_in.
fd&=037;/*getridofuserandsegmentbits*/25067}else{25068usr=who;/*normalcase*/25069seg=D;25070}2507125072/*Ifthefiledescriptorisvalid,gettheinode,sizeandmode.
*/25073if(m_in.
nbytesfilp_mode)&(rw_flag==READINGR_BIT:W_BIT))==0){25076return(f->filp_mode==FILP_CLOSEDEIO:EBADF);25077}25078if(m_in.
nbytes==0)25079return(0);/*socharspecialfilesneednotcheckfor0*/2508025081/*checkifuserprocesshasthememoryitneeds.
25082*ifnot,copyingwillfaillater.
25083*dothisafter0-checkabovebecauseumapdoesn'twanttomap0bytes.
25084*/25085if((r=sys_umap(usr,seg,(vir_bytes)m_in.
buffer,m_in.
nbytes,&p))!
=OK)25086returnr;25087position=f->filp_pos;25088oflags=f->filp_flags;25089rip=f->filp_ino;25090f_size=rip->i_size;25091r=OK;25092if(rip->i_pipe==I_PIPE){25093/*fp->fp_cum_io_partialisonlynonzerowhendoingpartialwrites*/25094cum_io=fp->fp_cum_io_partial;25095}else{25096cum_io=0;25097}25098op=(rw_flag==READINGDEV_READ:DEV_WRITE);25099mode_word=rip->i_mode&I_TYPE;25100regular=mode_word==I_REGULAR||mode_word==I_NAMED_PIPE;2510125102if((char_spec=(mode_word==I_CHAR_SPECIAL1:0))){25103if(rip->i_zone[0]==NO_DEV)25104panic(__FILE__,"read_writetriestoreadfrom"MINIXSOURCECODEFile:servers/fs/read.
c83725105"characterdeviceNO_DEV",NO_NUM);25106block_size=get_block_size(rip->i_zone[0]);25107}25108if((block_spec=(mode_word==I_BLOCK_SPECIAL1:0))){25109f_size=ULONG_MAX;25110if(rip->i_zone[0]==NO_DEV)25111panic(__FILE__,"read_writetriestoreadfrom"25112"blockdeviceNO_DEV",NO_NUM);25113block_size=get_block_size(rip->i_zone[0]);25114}2511525116if(!
char_spec&&!
block_spec)25117block_size=rip->i_sp->s_block_size;2511825119rdwt_err=OK;/*settoEIOifdiskerroroccurs*/2512025121/*Checkforcharacterspecialfiles.
*/25122if(char_spec){25123dev_tdev;25124dev=(dev_t)rip->i_zone[0];25125r=dev_io(op,dev,usr,m_in.
buffer,position,m_in.
nbytes,oflags);25126if(r>=0){25127cum_io=r;25128position+=r;25129r=OK;25130}25131}else{25132if(rw_flag==WRITING&&block_spec==0){25133/*Checkinadvancetoseeiffilewillgrowtoobig.
*/25134if(position>rip->i_sp->s_max_size-m_in.
nbytes)25135return(EFBIG);2513625137/*CheckforO_APPENDflag.
*/25138if(oflags&O_APPEND)position=f_size;2513925140/*ClearthezonecontainingpresentEOFifholeabout25141*tobecreated.
Thisisnecessarybecauseallunwritten25142*blockspriortotheEOFmustreadaszeros.
25143*/25144if(position>f_size)clear_zone(rip,f_size,0);25145}2514625147/*Pipesarealittledifferent.
Check.
*/25148if(rip->i_pipe==I_PIPE){25149r=pipe_check(rip,rw_flag,oflags,25150m_in.
nbytes,position,&partial_cnt,0);25151if(r0)partial_pipe=1;2515525156/*Splitthetransferintochunksthatdon'tspantwoblocks.
*/25157while(m_in.
nbytes!
=0){2515825159off=(unsignedint)(position%block_size);/*offsetinblk*/25160if(partial_pipe){/*pipesonly*/25161chunk=MIN(partial_cnt,block_size-off);25162}else25163chunk=MIN(m_in.
nbytes,block_size-off);25164if(chunk=f_size)break;/*wearebeyondEOF*/25169if(chunk>bytes_left)chunk=(int)bytes_left;25170}2517125172/*Readorwrite'chunk'bytes.
*/25173r=rw_chunk(rip,position,off,chunk,(unsigned)m_in.
nbytes,25174rw_flag,m_in.
buffer,seg,usr,block_size,&completed);2517525176if(r!
=OK)break;/*EOFreached*/25177if(rdwt_errccesstime.
*/25193if(rw_flag==WRITING){25194if(regular||mode_word==I_DIRECTORY){25195if(position>f_size)rip->i_size=position;25196}25197}else{25198if(rip->i_pipe==I_PIPE){25199if(position>=rip->i_size){25200/*Resetpipepointers.
*/25201rip->i_size=0;/*nodataleft*/25202position=0;/*resetreader(s)*/25203wf=find_filp(rip,W_BIT);25204if(wf!
=NIL_FILP)wf->filp_pos=0;25205}25206}25207}25208f->filp_pos=position;2520925210/*Checktoseeifread-aheadiscalledfor,andifso,setitup.
*/25211if(rw_flag==READING&&rip->i_seek==NO_SEEK&&position%block_size==025212&&(regular||mode_word==I_DIRECTORY)){25213rdahed_inode=rip;25214rdahedpos=position;25215}25216rip->i_seek=NO_SEEK;2521725218if(rdwt_err!
=OK)r=rdwt_err;/*checkfordiskerror*/25219if(rdwt_err==END_OF_FILE)r=OK;2522025221/*ifuser-spacecopyingfailed,read/writefailed.
*/25222if(r==OK&&r2!
=OK){25223r=r2;25224}MINIXSOURCECODEFile:servers/fs/read.
c83925225if(r==OK){25226if(rw_flag==READING)rip->i_update|=ATIME;25227if(rw_flag==WRITING)rip->i_update|=CTIME|MTIME;25228rip->i_dirt=DIRTY;/*inodeisthusnowdirty*/25229if(partial_pipe){25230partial_pipe=0;25231/*partialwriteonpipewith*/25232/*O_NONBLOCK,returnwritecount*/25233if(!
(oflags&O_NONBLOCK)){25234fp->fp_cum_io_partial=cum_io;25235suspend(XPIPE);/*partialwriteonpipewith*/25236return(SUSPEND);/*nbyte>PIPE_SIZE-non-atomic*/25237}25238}25239fp->fp_cum_io_partial=0;25240return(cum_io);25241}25242if(bufs_in_usei_mode&I_TYPE)==I_BLOCK_SPECIAL;25276if(block_spec){25277b=position/block_size;25278dev=(dev_t)rip->i_zone[0];25279}else{25280b=read_map(rip,position);25281dev=rip->i_dev;25282}2528325284if(!
block_spec&&b==NO_BLOCK){840File:servers/fs/read.
cMINIXSOURCECODE25285if(rw_flag==READING){25286/*Readingfromanonexistentblock.
Mustreadasallzeros.
*/25287bp=get_block(NO_DEV,NO_BLOCK,NORMAL);/*getabuffer*/25288zero_block(bp);25289}else{25290/*Writingtoanonexistentblock.
Createandenterininode.
*/25291if((bp=new_block(rip,position))==NIL_BUF)return(err_code);25292}25293}elseif(rw_flag==READING){25294/*Readandreadaheadifconvenient.
*/25295bp=rahead(rip,b,position,left);25296}else{25297/*Normallyanexistingblocktobepartiallyoverwrittenisfirstread25298*in.
However,afullblockneednotbereadin.
Ifitisalreadyin25299*thecache,acquireit,otherwisejustacquireafreebuffer.
25300*/25301n=(chunk==block_sizeNO_READ:NORMAL);25302if(!
block_spec&&off==0&&position>=rip->i_size)n=NO_READ;25303bp=get_block(dev,b,n);25304}2530525306/*Inallcases,bpnowpointstoavalidbuffer.
*/25307if(bp==NIL_BUF){25308panic(__FILE__,"bpnotvalidinrw_chunk,thiscan'thappen",NO_NUM);25309}25310if(rw_flag==WRITING&&chunk!
=block_size&&!
block_spec&&25311position>=rip->i_size&&off==0){25312zero_block(bp);25313}2531425315if(rw_flag==READING){25316/*Copyachunkfromtheblockbuffertouserspace.
*/25317r=sys_vircopy(FS_PROC_NR,D,(phys_bytes)(bp->b_data+off),25318usr,seg,(phys_bytes)buff,25319(phys_bytes)chunk);25320}else{25321/*Copyachunkfromuserspacetotheblockbuffer.
*/25322r=sys_vircopy(usr,seg,(phys_bytes)buff,25323FS_PROC_NR,D,(phys_bytes)(bp->b_data+off),25324(phys_bytes)chunk);25325bp->b_dirt=DIRTY;25326}25327n=(off+chunk==block_sizeFULL_DATA_BLOCK:PARTIAL_DATA_BLOCK);25328put_block(bp,n);2532925330return(r);25331}2533425335*read_map*2533625337PUBLICblock_tread_map(rip,position)25338registerstructinode*rip;/*ptrtoinodetomapfrom*/25339off_tposition;/*positioninfilewhoseblkwanted*/25340{25341/*Givenaninodeandapositionwithinthecorrespondingfile,locatethe25342*block(notzone)numberinwhichthatpositionistobefoundandreturnit.
25343*/25344MINIXSOURCECODEFile:servers/fs/read.
c84125345registerstructbuf*bp;25346registerzone_tz;25347intscale,boff,dzones,nr_indirects,index,zind,ex;25348block_tb;25349longexcess,zone,block_pos;2535025351scale=rip->i_sp->s_log_zone_size;/*forblock-zoneconversion*/25352block_pos=position/rip->i_sp->s_block_size;/*relativeblk#infile*/25353zone=block_pos>>scale;/*position'szone*/25354boff=(int)(block_pos-(zonei_ndzones;25356nr_indirects=rip->i_nindirs;2535725358/*Is'position'tobefoundintheinodeitself*/25359if(zonei_zone[zind];25362if(z==NO_ZONE)return(NO_BLOCK);25363b=((block_t)zi_zone[dzones];25373}else{25374/*'position'canbelocatedviathedoubleindirectblock.
*/25375if((z=rip->i_zone[dzones+1])==NO_ZONE)return(NO_BLOCK);25376excess-=nr_indirects;/*singleindirdoesn'tcount*/25377b=(block_t)zi_dev,b,NORMAL);/*getdoubleindirectblock*/25379index=(int)(excess/nr_indirects);25380z=rd_indir(bp,index);/*z=zoneforsingle*/25381put_block(bp,INDIRECT_BLOCK);/*releasedoubleindblock*/25382excess=excess%nr_indirects;/*indexintosingleindblk*/25383}2538425385/*'z'iszonenumforsingleindirectblock;'excess'isindexintoit.
*/25386if(z==NO_ZONE)return(NO_BLOCK);25387b=(block_t)zi_dev,b,NORMAL);/*getsingleindirectblock*/25389ex=(int)excess;/*needaninteger*/25390z=rd_indir(bp,ex);/*getblockpointedto*/25391put_block(bp,INDIRECT_BLOCK);/*releasesingleindirblk*/25392if(z==NO_ZONE)return(NO_BLOCK);25393b=((block_t)zb_dev);/*needsuperblocktofindfilesystype*/2541325414/*readazonefromanindirectblock*/25415if(sp->s_version==V1)25416zone=(zone_t)conv2(sp->s_native,(int)bp->b_v1_ind[index]);25417else25418zone=(zone_t)conv4(sp->s_native,(long)bp->b_v2_ind[index]);2541925420if(zone!
=NO_ZONE&&25421(zones_firstdatazone||zone>=sp->s_zones)){25422printf("Illegalzonenumber%ldinindirectblock,index%d\n",25423(long)zone,index);25424panic(__FILE__,"checkfilesystem",NO_NUM);25425}25426return(zone);25427}2542925430*read_ahead*2543125432PUBLICvoidread_ahead()25433{25434/*Readablockintothecachebeforeitisneeded.
*/25435intblock_size;25436registerstructinode*rip;25437structbuf*bp;25438block_tb;2543925440rip=rdahed_inode;/*pointertoinodetoreadaheadfrom*/25441block_size=get_block_size(rip->i_dev);25442rdahed_inode=NIL_INODE;/*turnoffreadahead*/25443if((b=read_map(rip,rdahedpos))==NO_BLOCK)return;/*atEOF*/25444bp=rahead(rip,b,rdahedpos,block_size);25445put_block(bp,PARTIAL_DATA_BLOCK);25446}2544825449*rahead*2545025451PUBLICstructbuf*rahead(rip,baseblock,position,bytes_ahead)25452registerstructinode*rip;/*pointertoinodeforfiletoberead*/25453block_tbaseblock;/*blockatcurrentposition*/25454off_tposition;/*positionwithinfile*/25455unsignedbytes_ahead;/*bytesbeyondpositionforimmediateuse*/25456{25457/*Fetchablockfromthecacheorthedevice.
Ifaphysicalreadis25458*required,prefetchasmanymoreblocksasconvenientintothecache.
25459*Thisusuallycoversbytes_aheadandisatleastBLOCKS_MINIMUM.
25460*Thedevicedrivermaydecideitknowsbetterandstopreadingata25461*cylinderboundary(orafteranerror).
Rw_scattered()putsanoptional25462*flagonallreadstoallowthis.
25463*/25464intblock_size;MINIXSOURCECODEFile:servers/fs/read.
c84325465/*Minimumnumberofblockstoprefetch.
*/25466#defineBLOCKS_MINIMUM(NR_BUFSi_mode&I_TYPE)==I_BLOCK_SPECIAL;25476if(block_spec){25477dev=(dev_t)rip->i_zone[0];25478}else{25479dev=rip->i_dev;25480}25481block_size=get_block_size(dev);2548225483block=baseblock;25484bp=get_block(dev,block,PREFETCH);25485if(bp->b_dev!
=NO_DEV)return(bp);2548625487/*Thebestguessforthenumberofblockstoprefetch:Alot.
25488*Itisimpossibletotellwhatthedevicelookslike,sowedon'teven25489*trytoguessthegeometry,butleaveittothedriver.
25490*25491*Thefloppydrivercanreadafulltrackwithnorotationaldelay,andit25492*avoidsreadingpartialtracksifitcan,sohandingitenoughbuffersto25493*readtwotracksisperfect.
(Two,becausesomediskettetypeshave25494*anoddnumberofsectorspertrack,soablockmayspantracks.
)25495*25496*Thediskdriversdon'ttrytobesmart.
Withtodaysdisksitis25497*impossibletotellwhattherealgeometrylookslike,soitisbestto25498*readasmuchasyoucan.
Withluckthecachingonthedriveallows25499*foralittletimetostartthenextread.
25500*25501*Thecurrentsolutionbelowisabitofahack,itjustreadsblocksfrom25502*thecurrentfilepositionhopingthatmoreofthefilecanbefound.
A25503*bettersolutionmustlookatthealreadyavailablezonepointersand25504*indirectblocks(butdon'tcallread_map!
).
25505*/2550625507fragment=position%block_size;25508position-=fragment;25509bytes_ahead+=fragment;2551025511blocks_ahead=(bytes_ahead+block_size-1)/block_size;2551225513if(block_spec&&rip->i_size==0){25514blocks_left=NR_IOREQS;25515}else{25516blocks_left=(rip->i_size-position+block_size-1)/block_size;2551725518/*Goforthefirstindirectblockifweareinitsneighborhood.
*/25519if(!
block_spec){25520scale=rip->i_sp->s_log_zone_size;25521ind1_pos=(off_t)rip->i_ndzones*(block_sizei_size>ind1_pos){25523blocks_ahead++;25524blocks_left++;844File:servers/fs/read.
cMINIXSOURCECODE25525}25526}25527}2552825529/*Nomorethanthemaximumrequest.
*/25530if(blocks_ahead>NR_IOREQS)blocks_ahead=NR_IOREQS;2553125532/*Readatleasttheminimumnumberofblocks,butnotafteraseek.
*/25533if(blocks_aheadi_seek==NO_SEEK)25534blocks_ahead=BLOCKS_MINIMUM;2553525536/*Can'tgopastendoffile.
*/25537if(blocks_ahead>blocks_left)blocks_ahead=blocks_left;2553825539read_q_size=0;2554025541/*Acquireblockbuffers.
*/25542for(;;){25543read_q[read_q_size++]=bp;2554425545if(--blocks_ahead==0)break;2554625547/*Don'ttrashthecache,leave4free.
*/25548if(bufs_in_use>=NR_BUFS-4)break;2554925550block++;2555125552bp=get_block(dev,block,PREFETCH);25553if(bp->b_dev!
=NO_DEV){25554/*Oops,blockalreadyinthecache,getout.
*/25555put_block(bp,FULL_DATA_BLOCK);25556break;25557}25558}25559rw_scattered(dev,read_q,read_q_size,READING);25560return(get_block(dev,baseblock,NORMAL));25561}servers/fs/write.
c25600/*Thisfileisthecounterpartof"read.
c".
Itcontainsthecodeforwriting25601*insofarasthisisnotcontainedinread_write().
25602*25603*Theentrypointsintothisfileare25604*do_write:callread_writetoperformtheWRITEsystemcall25605*clear_zone:eraseazoneinthemiddleofafile25606*new_block:acquireanewblock25607*/2560825609#include"fs.
h"25610#include25611#include"buf.
h"25612#include"file.
h"25613#include"fproc.
h"25614#include"inode.
h"MINIXSOURCECODEFile:servers/fs/write.
c84525615#include"super.
h"2561625617FORWARD_PROTOTYPE(intwrite_map,(structinode*rip,off_tposition,25618zone_tnew_zone));2561925620FORWARD_PROTOTYPE(voidwr_indir,(structbuf*bp,intindex,zone_tzone));256212562225623*do_write*2562425625PUBLICintdo_write()25626{25627/*Performthewrite(fd,buffer,nbytes)systemcall.
*/2562825629return(read_write(WRITING));25630}2563225633*write_map*2563425635PRIVATEintwrite_map(rip,position,new_zone)25636registerstructinode*rip;/*pointertoinodetobechanged*/25637off_tposition;/*fileaddresstobemapped*/25638zone_tnew_zone;/*zone#tobeinserted*/25639{25640/*Writeanewzoneintoaninode.
*/25641intscale,ind_ex,new_ind,new_dbl,zones,nr_indirects,single,zindex,ex;25642zone_tz,z1;25643registerblock_tb;25644longexcess,zone;25645structbuf*bp;2564625647rip->i_dirt=DIRTY;/*inodewillbechanged*/25648bp=NIL_BUF;25649scale=rip->i_sp->s_log_zone_size;/*forzone-blockconversion*/25650/*relativezone#toinsert*/25651zone=(position/rip->i_sp->s_block_size)>>scale;25652zones=rip->i_ndzones;/*#directzonesintheinode*/25653nr_indirects=rip->i_nindirs;/*#indirectzonesperindirectblock*/2565425655/*Is'position'tobefoundintheinodeitself*/25656if(zonei_zone[zindex]=new_zone;25659return(OK);25660}2566125662/*Itisnotintheinode,soitmustbesingleordoubleindirect.
*/25663excess=zone-zones;/*firstVx_NR_DZONESdon'tcount*/25664new_ind=FALSE;25665new_dbl=FALSE;2566625667if(excessi_zone[zones];/*singleindirectzone*/25670single=TRUE;25671}else{25672/*'position'canbelocatedviathedoubleindirectblock.
*/25673if((z=rip->i_zone[zones+1])==NO_ZONE){25674/*Createthedoubleindirectblock.
*/846File:servers/fs/write.
cMINIXSOURCECODE25675if((z=alloc_zone(rip->i_dev,rip->i_zone[0]))==NO_ZONE)25676return(err_code);25677rip->i_zone[zones+1]=z;25678new_dbl=TRUE;/*setflagforlater*/25679}2568025681/*Eitherway,'z'iszonenumberfordoubleindirectblock.
*/25682excess-=nr_indirects;/*singleindirectdoesn'tcount*/25683ind_ex=(int)(excess/nr_indirects);25684excess=excess%nr_indirects;25685if(ind_ex>=nr_indirects)return(EFBIG);25686b=(block_t)zi_dev,b,(new_dblNO_READ:NORMAL));25688if(new_dbl)zero_block(bp);25689z1=rd_indir(bp,ind_ex);25690single=FALSE;25691}2569225693/*z1isnowsingleindirectzone;'excess'isindex.
*/25694if(z1==NO_ZONE){25695/*Createindirectblockandstorezone#ininodeordblindirblk.
*/25696z1=alloc_zone(rip->i_dev,rip->i_zone[0]);25697if(single)25698rip->i_zone[zones]=z1;/*updateinode*/25699else25700wr_indir(bp,ind_ex,z1);/*updatedblindir*/2570125702new_ind=TRUE;25703if(bp!
=NIL_BUF)bp->b_dirt=DIRTY;/*ifdoubleind,itisdirty*/25704if(z1==NO_ZONE){25705put_block(bp,INDIRECT_BLOCK);/*releasedblindirectblk*/25706return(err_code);/*couldn'tcreatesingleind*/25707}25708}25709put_block(bp,INDIRECT_BLOCK);/*releasedoubleindirectblk*/2571025711/*z1isindirectblock'szonenumber.
*/25712b=(block_t)z1i_dev,b,(new_indNO_READ:NORMAL));25714if(new_ind)zero_block(bp);25715ex=(int)excess;/*weneedaninthere*/25716wr_indir(bp,ex,new_zone);25717bp->b_dirt=DIRTY;25718put_block(bp,INDIRECT_BLOCK);2571925720return(OK);25721}2572325724*wr_indir*2572525726PRIVATEvoidwr_indir(bp,index,zone)25727structbuf*bp;/*pointertoindirectblock*/25728intindex;/*indexinto*bp*/25729zone_tzone;/*zonetowrite*/25730{25731/*Givenapointertoanindirectblock,writeoneentry.
*/2573225733structsuper_block*sp;25734MINIXSOURCECODEFile:servers/fs/write.
c84725735sp=get_super(bp->b_dev);/*needsuperblocktofindfilesystype*/2573625737/*writeazoneintoanindirectblock*/25738if(sp->s_version==V1)25739bp->b_v1_ind[index]=(zone1_t)conv2(sp->s_native,(int)zone);25740else25741bp->b_v2_ind[index]=(zone_t)conv4(sp->s_native,(long)zone);25742}2574425745*clear_zone*2574625747PUBLICvoidclear_zone(rip,pos,flag)25748registerstructinode*rip;/*inodetoclear*/25749off_tpos;/*pointstoblocktoclear*/25750intflag;/*0ifcalledbyread_write,1bynew_block*/25751{25752/*Zeroazone,possiblystartinginthemiddle.
Theparameter'pos'gives25753*abyteinthefirstblocktobezeroed.
Clearzone()iscalledfrom25754*read_writeandnew_block().
25755*/2575625757registerstructbuf*bp;25758registerblock_tb,blo,bhi;25759registeroff_tnext;25760registerintscale;25761registerzone_tzone_size;2576225763/*Iftheblocksizeandzonesizearethesame,clear_zone()notneeded.
*/25764scale=rip->i_sp->s_log_zone_size;25765if(scale==0)return;2576625767zone_size=(zone_t)rip->i_sp->s_block_sizei_sp->s_block_size-1;2577025771/*If'pos'isinthelastblockofazone,donotclearthezone.
*/25772if(next/zone_size!
=pos/zone_size)return;25773if((blo=read_map(rip,next))==NO_BLOCK)return;25774bhi=(((blo>>scale)+1)i_dev,b,NO_READ);25779zero_block(bp);25780put_block(bp,FULL_DATA_BLOCK);25781}25782}2578425785*new_block*2578625787PUBLICstructbuf*new_block(rip,position)25788registerstructinode*rip;/*pointertoinode*/25789off_tposition;/*filepointer*/25790{25791/*Acquireanewblockandreturnapointertoit.
Doingsomayrequire25792*allocatingacompletezone,andthenreturningtheinitialblock.
25793*Ontheotherhand,thecurrentzonemaystillhavesomeunusedblocks.
25794*/848File:servers/fs/write.
cMINIXSOURCECODE2579525796registerstructbuf*bp;25797block_tb,base_block;25798zone_tz;25799zone_tzone_size;25800intscale,r;25801structsuper_block*sp;2580225803/*Isanotherblockavailableinthecurrentzone*/25804if((b=read_map(rip,position))==NO_BLOCK){25805/*Choosefirstzoneifpossible.
*/25806/*LoseifthefileisnonemptybutthefirstzonenumberisNO_ZONE25807*correspondingtoazonefullofzeros.
Itwouldbebetterto25808*searchnearthelastrealzone.
25809*/25810if(rip->i_zone[0]==NO_ZONE){25811sp=rip->i_sp;25812z=sp->s_firstdatazone;25813}else{25814z=rip->i_zone[0];/*huntnearfirstzone*/25815}25816if((z=alloc_zone(rip->i_dev,z))==NO_ZONE)return(NIL_BUF);25817if((r=write_map(rip,position,z))!
=OK){25818free_zone(rip->i_dev,z);25819err_code=r;25820return(NIL_BUF);25821}2582225823/*IfwearenotwritingatEOF,clearthezone,justtobesafe.
*/25824if(position!
=rip->i_size)clear_zone(rip,position,1);25825scale=rip->i_sp->s_log_zone_size;25826base_block=(block_t)zi_sp->s_block_sizei_sp->s_block_size);25829}2583025831bp=get_block(rip->i_dev,b,NO_READ);25832zero_block(bp);25833return(bp);25834}2583625837*zero_block*2583825839PUBLICvoidzero_block(bp)25840registerstructbuf*bp;/*pointertobuffertozero*/25841{25842/*Zeroablock.
*/25843memset(bp->b_data,0,MAX_BLOCK_SIZE);25844bp->b_dirt=DIRTY;25845}MINIXSOURCECODEFile:servers/fs/pipe.
c849servers/fs/pipe.
c25900/*Thisfiledealswiththesuspensionandrevivalofprocesses.
Aprocesscan25901*besuspendedbecauseitwantstoreadorwritefromapipeandcan't,or25902*becauseitwantstoreadorwritefromaspecialfileandcan't.
Whena25903*processcan'tcontinueitissuspended,andrevivedlaterwhenitisable25904*tocontinue.
25905*25906*Theentrypointsintothisfileare25907*do_pipe:performthePIPEsystemcall25908*pipe_check:checktoseethatareadorwriteonapipeisfeasiblenow25909*suspend:suspendaprocessthatcannotdoarequestedreadorwrite25910*release:checktoseeifasuspendedprocesscanbereleasedanddo25911*it25912*revive:markasuspendedprocessasabletorunagain25913*do_unpause:asignalhasbeensenttoaprocess;seeifitsuspended25914*/2591525916#include"fs.
h"25917#include25918#include25919#include25920#include25921#include25922#include25923#include"file.
h"25924#include"fproc.
h"25925#include"inode.
h"25926#include"param.
h"25927#include"super.
h"25928#include"select.
h"259292593025931*do_pipe*2593225933PUBLICintdo_pipe()25934{25935/*Performthepipe(fil_des)systemcall.
*/2593625937registerstructfproc*rfp;25938registerstructinode*rip;25939intr;25940structfilp*fil_ptr0,*fil_ptr1;25941intfil_des[2];/*replygoeshere*/2594225943/*Acquiretwofiledescriptors.
*/25944rfp=fp;25945if((r=get_fd(0,R_BIT,&fil_des[0],&fil_ptr0))!
=OK)return(r);25946rfp->fp_filp[fil_des[0]]=fil_ptr0;25947fil_ptr0->filp_count=1;25948if((r=get_fd(0,W_BIT,&fil_des[1],&fil_ptr1))!
=OK){25949rfp->fp_filp[fil_des[0]]=NIL_FILP;25950fil_ptr0->filp_count=0;25951return(r);25952}25953rfp->fp_filp[fil_des[1]]=fil_ptr1;25954fil_ptr1->filp_count=1;850File:servers/fs/pipe.
cMINIXSOURCECODE2595525956/*Maketheinodeonthepipedevice.
*/25957if((rip=alloc_inode(root_dev,I_REGULAR))==NIL_INODE){25958rfp->fp_filp[fil_des[0]]=NIL_FILP;25959fil_ptr0->filp_count=0;25960rfp->fp_filp[fil_des[1]]=NIL_FILP;25961fil_ptr1->filp_count=0;25962return(err_code);25963}2596425965if(read_only(rip)!
=OK)25966panic(__FILE__,"pipedeviceisreadonly",NO_NUM);2596725968rip->i_pipe=I_PIPE;25969rip->i_mode&=I_REGULAR;25970rip->i_mode|=I_NAMED_PIPE;/*pipesandFIFOshavethisbitset*/25971fil_ptr0->filp_ino=rip;25972fil_ptr0->filp_flags=O_RDONLY;25973dup_inode(rip);/*fordoubleusage*/25974fil_ptr1->filp_ino=rip;25975fil_ptr1->filp_flags=O_WRONLY;25976rw_inode(rip,WRITING);/*markinodeasallocated*/25977m_out.
reply_i1=fil_des[0];25978m_out.
reply_i2=fil_des[1];25979rip->i_update=ATIME|CTIME|MTIME;25980return(OK);25981}2598325984*pipe_check*2598525986PUBLICintpipe_check(rip,rw_flag,oflags,bytes,position,canwrite,notouch)25987registerstructinode*rip;/*theinodeofthepipe*/25988intrw_flag;/*READINGorWRITING*/25989intoflags;/*flagssetbyopenorfcntl*/25990registerintbytes;/*bytestobereadorwritten(allchunks)*/25991registeroff_tposition;/*currentfileposition*/25992int*canwrite;/*return:numberofbyteswecanwrite*/25993intnotouch;/*checkonly*/25994{25995/*Pipesarealittledifferent.
Ifaprocessreadsfromanemptypipefor25996*whichawriterstillexists,suspendthereader.
Ifthepipeisempty25997*andthereisnowriter,return0bytes.
Ifaprocessiswritingtoa25998*pipeandnooneisreadingfromit,giveabrokenpipeerror.
25999*/2600026001/*Ifreading,checkforemptypipe.
*/26002if(rw_flag==READING){26003if(position>=rip->i_size){26004/*Processisreadingfromanemptypipe.
*/26005intr=0;26006if(find_filp(rip,W_BIT)!
=NIL_FILP){26007/*Writerexists*/26008if(oflags&O_NONBLOCK){26009r=EAGAIN;26010}else{26011if(!
notouch)26012suspend(XPIPE);/*blockreader*/26013r=SUSPEND;26014}MINIXSOURCECODEFile:servers/fs/pipe.
c85126015/*Ifneedbe,activatesleepingwriters.
*/26016if(susp_count>0&&!
notouch)26017release(rip,WRITE,susp_count);26018}26019return(r);26020}26021}else{26022/*Processiswritingtoapipe.
*/26023if(find_filp(rip,R_BIT)==NIL_FILP){26024/*TellkerneltogenerateaSIGPIPEsignal.
*/26025if(!
notouch)26026sys_kill((int)(fp-fproc),SIGPIPE);26027return(EPIPE);26028}2602926030if(position+bytes>PIPE_SIZE(rip->i_sp->s_block_size)){26031if((oflags&O_NONBLOCK)26032&&bytesi_sp->s_block_size))26033return(EAGAIN);26034elseif((oflags&O_NONBLOCK)26035&&bytes>PIPE_SIZE(rip->i_sp->s_block_size)){26036if((*canwrite=(PIPE_SIZE(rip->i_sp->s_block_size)26037-position))>0){26038/*Doapartialwrite.
Needtowakeupreader*/26039if(!
notouch)26040release(rip,READ,susp_count);26041return(1);26042}else{26043return(EAGAIN);26044}26045}26046if(bytes>PIPE_SIZE(rip->i_sp->s_block_size)){26047if((*canwrite=PIPE_SIZE(rip->i_sp->s_block_size)26048-position)>0){26049/*Doapartialwrite.
Needtowakeupreader26050*sincewe'llsuspendourselfinread_write()26051*/26052release(rip,READ,susp_count);26053return(1);26054}26055}26056if(!
notouch)26057suspend(XPIPE);/*stopwriter--pipefull*/26058return(SUSPEND);26059}2606026061/*Writingtoanemptypipe.
Searchforsuspendedreader.
*/26062if(position==0&&!
notouch)26063release(rip,READ,susp_count);26064}2606526066*canwrite=0;26067return(1);26068}2607026071*suspend*2607226073PUBLICvoidsuspend(task)26074inttask;/*whoisprocwaitingfor(PIPE=pipe)*/852File:servers/fs/pipe.
cMINIXSOURCECODE26075{26076/*Takemeasurestosuspendtheprocessingofthepresentsystemcall.
26077*Storetheparameterstobeuseduponresumingintheprocesstable.
26078*(ActuallytheyarenotusedwhenaprocessiswaitingforanI/Odevice,26079*buttheyareneededforpipes,anditisnotworthmakingthedistinction.
)26080*TheSUSPENDpseudoerrorshouldbereturnedaftercallingsuspend().
26081*/2608226083if(task==XPIPE||task==XPOPEN)susp_count++;/*#procssusp'edonpipe*/26084fp->fp_suspended=SUSPENDED;26085fp->fp_fd=m_in.
fdfp_task=-task;26087if(task==XLOCK){26088fp->fp_buffer=(char*)m_in.
name1;/*thirdargtofcntl()*/26089fp->fp_nbytes=m_in.
request;/*secondargtofcntl()*/26090}else{26091fp->fp_buffer=m_in.
buffer;/*forreadsandwrites*/26092fp->fp_nbytes=m_in.
nbytes;26093}26094}2609626097*release*2609826099PUBLICvoidrelease(ip,call_nr,count)26100registerstructinode*ip;/*inodeofpipe*/26101intcall_nr;/*READ,WRITE,OPENorCREAT*/26102intcount;/*maxnumberofprocessestorelease*/26103{26104/*Checktoseeifanyprocessishangingonthepipewhoseinodeisin'ip'.
26105*Ifoneis,anditwastryingtoperformthecallindicatedby'call_nr',26106*releaseit.
26107*/2610826109registerstructfproc*rp;26110structfilp*f;2611126112/*TryingtoperformthecallalsoincludesSELECTingonitwiththat26113*operation.
26114*/26115if(call_nr==READ||call_nr==WRITE){26116intop;26117if(call_nr==READ)26118op=SEL_RD;26119else26120op=SEL_WR;26121for(f=&filp[0];ffilp_countfilp_pipe_select_ops&op)||26123f->filp_ino!
=ip)26124continue;26125select_callback(f,op);26126f->filp_pipe_select_ops&=op;26127}26128}2612926130/*Searchtheproctable.
*/26131for(rp=&fproc[0];rpfp_suspended==SUSPENDED&&26133rp->fp_revived==NOT_REVIVING&&26134(rp->fp_fd&BYTE)==call_nr&&MINIXSOURCECODEFile:servers/fs/pipe.
c85326135rp->fp_filp[rp->fp_fd>>8]->filp_ino==ip){26136revive((int)(rp-fproc),0);26137susp_count--;/*keeptrackofwhoissuspended*/26138if(--count==0)return;26139}26140}26141}2614326144*revive*2614526146PUBLICvoidrevive(proc_nr,returned)26147intproc_nr;/*processtorevive*/26148intreturned;/*ifhangingontask,howmanybytesread*/26149{26150/*Reviveapreviouslyblockedprocess.
Whenaprocesshangsontty,this26151*isthewayitiseventuallyreleased.
26152*/2615326154registerstructfproc*rfp;26155registerinttask;2615626157if(proc_nr=NR_PROCS)26158panic(__FILE__,"reviveerr",proc_nr);26159rfp=&fproc[proc_nr];26160if(rfp->fp_suspended==NOT_SUSPENDED||rfp->fp_revived==REVIVING)return;2616126162/*The'reviving'flagonlyappliestopipes.
ProcesseswaitingforTTYget26163*amessagerightaway.
TherevivalprocessisdifferentforTTYandpipes.
26164*ForselectandTTYrevival,theworkisalreadydone,forpipesitisnot:26165*theprocmustberestartedsoitcantryagain.
26166*/26167task=-rfp->fp_task;26168if(task==XPIPE||task==XLOCK){26169/*Reviveaprocesssuspendedonapipeorlock.
*/26170rfp->fp_revived=REVIVING;26171reviving++;/*processwaswaitingonpipeorlock*/26172}else{26173rfp->fp_suspended=NOT_SUSPENDED;26174if(task==XPOPEN)/*processblockedinopenorcreate*/26175reply(proc_nr,rfp->fp_fd>>8);26176elseif(task==XSELECT){26177reply(proc_nr,returned);26178}else{26179/*ReviveaprocesssuspendedonTTYorotherdevice.
*/26180rfp->fp_nbytes=returned;/*pretenditwantsonlywhatthereis*/26181reply(proc_nr,returned);/*unblocktheprocess*/26182}26183}26184}2618626187*do_unpause*2618826189PUBLICintdo_unpause()26190{26191/*Asignalhasbeensenttoauserwhoispausedonthefilesystem.
26192*AbortthesystemcallwiththeEINTRerrormessage.
26193*/26194854File:servers/fs/pipe.
cMINIXSOURCECODE26195registerstructfproc*rfp;26196intproc_nr,task,fild;26197structfilp*f;26198dev_tdev;26199messagemess;2620026201if(who>PM_PROC_NR)return(EPERM);26202proc_nr=m_in.
pro;26203if(proc_nr=NR_PROCS)26204panic(__FILE__,"unpauseerr1",proc_nr);26205rfp=&fproc[proc_nr];26206if(rfp->fp_suspended==NOT_SUSPENDED)return(OK);26207task=-rfp->fp_task;2620826209switch(task){26210caseXPIPE:/*processtryingtoreadorwriteapipe*/26211break;2621226213caseXLOCK:/*processtryingtosetalockwithFCNTL*/26214break;2621526216caseXSELECT:/*processblockingonselect()*/26217select_forget(proc_nr);26218break;2621926220caseXPOPEN:/*processtryingtoopenafifo*/26221break;2622226223default:/*processtryingtododeviceI/O(e.
g.
tty)*/26224fild=(rfp->fp_fd>>8)&BYTE;/*extractfiledescriptor*/26225if(fild=OPEN_MAX)26226panic(__FILE__,"unpauseerr2",NO_NUM);26227f=rfp->fp_filp[fild];26228dev=(dev_t)f->filp_ino->i_zone[0];/*devicehungon*/26229mess.
TTY_LINE=(dev>>MINOR)&BYTE;26230mess.
PROC_NR=proc_nr;2623126232/*TellkernelRorW.
Modeisfromcurrentcall,notopen.
*/26233mess.
COUNT=(rfp->fp_fd&BYTE)==READR_BIT:W_BIT;26234mess.
m_type=CANCEL;26235fp=rfp;/*hack-ctty_iousesfp*/26236(*dmap[(dev>>MAJOR)&BYTE].
dmap_io)(task,&mess);26237}2623826239rfp->fp_suspended=NOT_SUSPENDED;26240reply(proc_nr,EINTR);/*signalinterruptedcall*/26241return(OK);26242}2624426245*select_request_pipe*2624626247PUBLICintselect_request_pipe(structfilp*f,int*ops,intblock)26248{26249intorig_ops,r=0,err,canwrite;26250orig_ops=*ops;26251if((*ops&SEL_RD)){26252if((err=pipe_check(f->filp_ino,READING,0,262531,f->filp_pos,&canwrite,1))!
=SUSPEND)26254r|=SEL_RD;MINIXSOURCECODEFile:servers/fs/pipe.
c85526255if(errfilp_ino,WRITING,0,262601,f->filp_pos,&canwrite,1))!
=SUSPEND)26261r|=SEL_WR;26262if(errfilp_pipe_select_ops|=orig_ops;26270}2627126272returnSEL_OK;26273}2627526276*select_match_pipe*2627726278PUBLICintselect_match_pipe(structfilp*f)26279{26280/*recognizeeitherpipeornamedpipe(FIFO)*/26281if(f&&f->filp_ino&&(f->filp_ino->i_mode&I_NAMED_PIPE))26282return1;26283return0;26284}servers/fs/path.
c26300/*Thisfilecontainstheproceduresthatlookuppathnamesinthedirectory26301*systemanddeterminetheinodenumberthatgoeswithagivenpathname.
26302*26303*Theentrypointsintothisfileare26304*eat_path:the'main'routineofthepath-to-inodeconversionmechanism26305*last_dir:findthefinaldirectoryonagivenpath26306*advance:parseonecomponentofapathname26307*search_dir:searchadirectoryforastringandreturnitsinodenumber26308*/2630926310#include"fs.
h"26311#include26312#include26313#include"buf.
h"26314#include"file.
h"26315#include"fproc.
h"26316#include"inode.
h"26317#include"super.
h"2631826319PUBLICchardot1[2]usedforsearch_dirtobypasstheaccess*/856File:servers/fs/path.
cMINIXSOURCECODE26320PUBLICchardot2[3]permissionsfor.
and.
.
*/2632126322FORWARD_PROTOTYPE(char*get_name,(char*old_name,charstring[NAME_MAX]));263232632426325*eat_path*2632626327PUBLICstructinode*eat_path(path)26328char*path;/*thepathnametobeparsed*/26329{26330/*Parsethepath'path'andputitsinodeintheinodetable.
Ifnotpossible,26331*returnNIL_INODEasfunctionvalueandanerrorcodein'err_code'.
26332*/2633326334registerstructinode*ldip,*rip;26335charstring[NAME_MAX];/*hold1pathcomponentnamehere*/2633626337/*Firstopenthepathdowntothefinaldirectory.
*/26338if((ldip=last_dir(path,string))==NIL_INODE){26339return(NIL_INODE);/*wecouldn'topenfinaldirectory*/26340}2634126342/*Thepathconsistingonlyof"/"isaspecialcase,checkforit.
*/26343if(string[0]=='\0')return(ldip);2634426345/*Getfinalcomponentofthepath.
*/26346rip=advance(ldip,string);26347put_inode(ldip);26348return(rip);26349}2635126352*last_dir*2635326354PUBLICstructinode*last_dir(path,string)26355char*path;/*thepathnametobeparsed*/26356charstring[NAME_MAX];/*thefinalcomponentisreturnedhere*/26357{26358/*Givenapath,'path',locatedinthefsaddressspace,parseitas26359*farasthelastdirectory,fetchtheinodeforthelastdirectoryinto26360*theinodetable,andreturnapointertotheinode.
In26361*addition,returnthefinalcomponentofthepathin'string'.
26362*Ifthelastdirectorycan'tbeopened,returnNIL_INODEand26363*thereasonforfailurein'err_code'.
26364*/2636526366registerstructinode*rip;26367registerchar*new_name;26368registerstructinode*new_ip;2636926370/*IsthepathabsoluteorrelativeInitialize'rip'accordingly.
*/26371rip=(*pathfp->fp_rootdir:fp->fp_workdir);2637226373/*Ifdirhasbeenremovedorpathisempty,returnENOENT.
*/26374if(rip->i_nlinks==0||*path=='\0'){26375err_code=ENOENT;26376return(NIL_INODE);26377}2637826379dup_inode(rip);/*inodewillbereturnedwithput_inode*/MINIXSOURCECODEFile:servers/fs/path.
c8572638026381/*Scanthepathcomponentbycomponent.
*/26382while(TRUE){26383/*Extractonecomponent.
*/26384if((new_name=get_name(path,string))==(char*)0){26385put_inode(rip);/*badpathinuserspace*/26386return(NIL_INODE);26387}26388if(*new_name=='\0'){26389if((rip->i_mode&I_TYPE)==I_DIRECTORY){26390return(rip);/*normalexit*/26391}else{26392/*lastfileofpathprefixisnotadirectory*/26393put_inode(rip);26394err_code=ENOTDIR;26395return(NIL_INODE);26396}26397}2639826399/*Thereismorepath.
Keepparsing.
*/26400new_ip=advance(rip,string);26401put_inode(rip);/*ripeitherobsoleteorirrelevant*/26402if(new_ip==NIL_INODE)return(NIL_INODE);2640326404/*Thecalltoadvance()succeeded.
Fetchnextcomponent.
*/26405path=new_name;26406rip=new_ip;26407}26408}2641026411*get_name*2641226413PRIVATEchar*get_name(old_name,string)26414char*old_name;/*pathnametoparse*/26415charstring[NAME_MAX];/*componentextractedfrom'old_name'*/26416{26417/*Givenapointertoapathnameinfsspace,'old_name',copythenext26418*componentto'string'andpadwithzeros.
Apointertothatpartof26419*thenameasyetunparsedisreturned.
Roughlyspeaking,26420*'get_name'='old_name'-'string'.
26421*26422*Thisroutinefollowsthestandardconventionthat/usr/ast,/usr//ast,26423*//usr///astand/usr/ast/areallequivalent.
26424*/2642526426registerintc;26427registerchar*np,*rnp;2642826429np=string;/*'np'pointstocurrentposition*/26430rnp=old_name;/*'rnp'pointstounparsedstring*/26431while((c=*rnp)rnp++;/*skipleadingslashes*/2643226433/*Copytheunparsedpath,'old_name',tothearray,'string'.
*/26434while(rnp=&old_name[PATH_MAX]){26445err_code=ENAMETOOLONG;26446return((char*)0);26447}26448return(rnp);26449}2645126452*advance*2645326454PUBLICstructinode*advance(dirp,string)26455structinode*dirp;/*inodefordirectorytobesearched*/26456charstring[NAME_MAX];/*componentnametolookfor*/26457{26458/*Givenadirectoryandacomponentofapath,lookupthecomponentin26459*thedirectory,findtheinode,openit,andreturnapointertoitsinode26460*slot.
Ifitcan'tbedone,returnNIL_INODE.
26461*/2646226463registerstructinode*rip;26464structinode*rip2;26465registerstructsuper_block*sp;26466intr,inumb;26467dev_tmnt_dev;26468ino_tnumb;2646926470/*If'string'isempty,yieldsameinodestraightaway.
*/26471if(string[0]=='\0'){return(get_inode(dirp->i_dev,(int)dirp->i_num));}2647226473/*CheckforNIL_INODE.
*/26474if(dirp==NIL_INODE){return(NIL_INODE);}2647526476/*If'string'isnotpresentinthedirectory,signalerror.
*/26477if((r=search_dir(dirp,string,&numb,LOOK_UP))!
=OK){26478err_code=r;26479return(NIL_INODE);26480}2648126482/*Don'tgobeyondthecurrentrootdirectory,unlessthestringisdot2.
*/26483if(dirp==fp->fp_rootdir&&strcmp(string,0&&string!
=dot2)26484return(get_inode(dirp->i_dev,(int)dirp->i_num));2648526486/*Thecomponenthasbeenfoundinthedirectory.
Getinode.
*/26487if((rip=get_inode(dirp->i_dev,(int)numb))==NIL_INODE){26488return(NIL_INODE);26489}2649026491if(rip->i_num==ROOT_INODE)26492if(dirp->i_num==ROOT_INODE){26493if(string[1]26494for(sp=&super_block[1];sps_dev==rip->i_dev){26496/*Releasetherootinode.
Replacebythe26497*inodemountedon.
26498*/26499put_inode(rip);MINIXSOURCECODEFile:servers/fs/path.
c85926500mnt_dev=sp->s_imount->i_dev;26501inumb=(int)sp->s_imount->i_num;26502rip2=get_inode(mnt_dev,inumb);26503rip=advance(rip2,string);26504put_inode(rip2);26505break;26506}26507}26508}26509}26510if(rip==NIL_INODE)return(NIL_INODE);2651126512/*Seeiftheinodeismountedon.
Ifso,switchtorootdirectoryofthe26513*mountedfilesystem.
Thesuper_blockprovidesthelinkagebetweenthe26514*inodemountedonandtherootdirectoryofthemountedfilesystem.
26515*/26516while(rip!
=NIL_INODE&&rip->i_mount==I_MOUNT){26517/*Theinodeisindeedmountedon.
*/26518for(sp=&super_block[0];sps_imount==rip){26520/*Releasetheinodemountedon.
Replacebythe26521*inodeoftherootinodeofthemounteddevice.
26522*/26523put_inode(rip);26524rip=get_inode(sp->s_dev,ROOT_INODE);26525break;26526}26527}26528}26529return(rip);/*returnpointertoinode'scomponent*/26530}2653226533*search_dir*2653426535PUBLICintsearch_dir(ldir_ptr,string,numb,flag)26536registerstructinode*ldir_ptr;/*ptrtoinodefordirtosearch*/26537charstring[NAME_MAX];/*componenttosearchfor*/26538ino_t*numb;/*pointertoinodenumber*/26539intflag;/*LOOK_UP,ENTER,DELETEorIS_EMPTY*/26540{26541/*Thisfunctionsearchesthedirectorywhoseinodeispointedtoby'ldip':26542*if(flag==ENTER)enter'string'inthedirectorywithinode#'*numb';26543*if(flag==DELETE)delete'string'fromthedirectory;26544*if(flag==LOOK_UP)searchfor'string'andreturninode#in'numb';26545*if(flag==IS_EMPTY)returnOKifonly.
and.
.
indirelseENOTEMPTY;26546*26547*if'string'isdot1ordot2,noaccesspermissionsarechecked.
26548*/2654926550registerstructdirect*dp=NULL;26551registerstructbuf*bp=NULL;26552inti,r,e_hit,t,match;26553mode_tbits;26554off_tpos;26555unsignednew_slots,old_slots;26556block_tb;26557structsuper_block*sp;26558intextended=0;26559860File:servers/fs/path.
cMINIXSOURCECODE26560/*If'ldir_ptr'isnotapointertoadirinode,error.
*/26561if((ldir_ptr->i_mode&I_TYPE)!
=I_DIRECTORY)return(ENOTDIR);2656226563r=OK;2656426565if(flag!
=IS_EMPTY){26566bits=(flag==LOOK_UPX_BIT:W_BIT|X_BIT);2656726568if(string==dot1||string==dot2){26569if(flag!
=LOOK_UP)r=read_only(ldir_ptr);26570/*onlyawritabledeviceisrequired.
*/26571}26572elser=forbidden(ldir_ptr,bits);/*checkaccesspermissions*/26573}26574if(r!
=OK)return(r);2657526576/*Stepthroughthedirectoryoneblockatatime.
*/26577old_slots=(unsigned)(ldir_ptr->i_size/DIR_ENTRY_SIZE);26578new_slots=0;26579e_hit=FALSE;26580match=0;/*setwhenastringmatchoccurs*/2658126582for(pos=0;posi_size;pos+=ldir_ptr->i_sp->s_block_size){26583b=read_map(ldir_ptr,pos);/*getblocknumber*/2658426585/*Sincedirectoriesdon'thaveholes,'b'cannotbeNO_BLOCK.
*/26586bp=get_block(ldir_ptr->i_dev,b,NORMAL);/*getadirblock*/2658726588if(bp==NO_BLOCK)26589panic(__FILE__,"get_blockreturnedNO_BLOCK",NO_NUM);2659026591/*Searchadirectoryblock.
*/26592for(dp=&bp->b_dir[0];26593dpb_dir[NR_DIR_ENTRIES(ldir_ptr->i_sp->s_block_size)];26594dp++){26595if(++new_slots>old_slots){/*notfound,butroomleft*/26596if(flag==ENTER)e_hit=TRUE;26597break;26598}2659926600/*Matchoccursifstringfound.
*/26601if(flag!
=ENTER&&dp->d_ino!
=0){26602if(flag==IS_EMPTY){26603/*Ifthistestsucceeds,dirisnotempty.
*/26604if(strcmp(dp->d_name,0&&26605strcmp(dp->d_name,0)match=1;26606}else{26607if(strncmp(dp->d_name,string,NAME_MAX)==0){26608match=1;26609}26610}26611}2661226613if(match){26614/*LOOK_UPorDELETEfoundwhatitwanted.
*/26615r=OK;26616if(flag==IS_EMPTY)r=ENOTEMPTY;26617elseif(flag==DELETE){26618/*Saved_inoforrecovery.
*/26619t=NAME_MAX-sizeof(ino_t);MINIXSOURCECODEFile:servers/fs/path.
c86126620*((ino_t*)&dp->d_name[t])=dp->d_ino;26621dp->d_ino=0;/*eraseentry*/26622bp->b_dirt=DIRTY;26623ldir_ptr->i_update|=CTIME|MTIME;26624ldir_ptr->i_dirt=DIRTY;26625}else{26626sp=ldir_ptr->i_sp;/*'flag'isLOOK_UP*/26627*numb=conv4(sp->s_native,(int)dp->d_ino);26628}26629put_block(bp,DIRECTORY_BLOCK);26630return(r);26631}2663226633/*CheckforfreeslotforthebenefitofENTER.
*/26634if(flag==ENTER&&dp->d_ino==0){26635e_hit=TRUE;/*wefoundafreeslot*/26636break;26637}26638}2663926640/*ThewholeblockhasbeensearchedorENTERhasafreeslot.
*/26641if(e_hit)break;/*e_hitsetifENTERcanbeperformednow*/26642put_block(bp,DIRECTORY_BLOCK);/*otherwise,continuesearchingdir*/26643}2664426645/*Thewholedirectoryhasnowbeensearched.
*/26646if(flag!
=ENTER){26647return(flag==IS_EMPTYOK:ENOENT);26648}2664926650/*ThiscallisforENTER.
Ifnofreeslothasbeenfoundsofar,tryto26651*extenddirectory.
26652*/26653if(e_hit==FALSE){/*directoryisfullandnoroomleftinlastblock*/26654new_slots++;/*increasedirectorysizeby1entry*/26655if(new_slots==0)return(EFBIG);/*dirsizelimitedbyslotcount*/26656if((bp=new_block(ldir_ptr,ldir_ptr->i_size))==NIL_BUF)26657return(err_code);26658dp=&bp->b_dir[0];26659extended=1;26660}2666126662/*'bp'nowpointstoadirectoryblockwithspace.
'dp'pointstoslot.
*/26663(void)memset(dp->d_name,0,(size_t)NAME_MAX);/*clearentry*/26664for(i=0;string[i]&&id_name[i]=string[i];26665sp=ldir_ptr->i_sp;26666dp->d_ino=conv4(sp->s_native,(int)*numb);26667bp->b_dirt=DIRTY;26668put_block(bp,DIRECTORY_BLOCK);26669ldir_ptr->i_update|=CTIME|MTIME;/*markmtimeforupdatelater*/26670ldir_ptr->i_dirt=DIRTY;26671if(new_slots>old_slots){26672ldir_ptr->i_size=(off_t)new_slots*DIR_ENTRY_SIZE;26673/*Sendthechangetodiskifthedirectoryisextended.
*/26674if(extended)rw_inode(ldir_ptr,WRITING);26675}26676return(OK);26677}862File:servers/fs/mount.
cMINIXSOURCECODEservers/fs/mount.
c26700/*ThisfileperformstheMOUNTandUMOUNTsystemcalls.
26701*26702*Theentrypointsintothisfileare26703*do_mount:performtheMOUNTsystemcall26704*do_umount:performtheUMOUNTsystemcall26705*/2670626707#include"fs.
h"26708#include26709#include26710#include26711#include"buf.
h"26712#include"file.
h"26713#include"fproc.
h"26714#include"inode.
h"26715#include"param.
h"26716#include"super.
h"2671726718FORWARD_PROTOTYPE(dev_tname_to_dev,(char*path));267192672026721*do_mount*2672226723PUBLICintdo_mount()26724{26725/*Performthemount(name,mfile,rd_only)systemcall.
*/2672626727registerstructinode*rip,*root_ip;26728structsuper_block*xp,*sp;26729dev_tdev;26730mode_tbits;26731intrdir,mdir;/*TRUEiff{root|mount}fileisdir*/26732intr,found;2673326734/*Onlythesuper-usermaydoMOUNT.
*/26735if(!
super_user)return(EPERM);2673626737/*If'name'isnotforablockspecialfile,returnerror.
*/26738if(fetch_name(m_in.
name1,m_in.
name1_length,M1)!
=OK)return(err_code);26739if((dev=name_to_dev(user_path))==NO_DEV)return(err_code);2674026741/*Scansuperblocktabletoseeifdevalreadymounted&findafreeslot.
*/26742sp=NIL_SUPER;26743found=FALSE;26744for(xp=&super_block[0];xps_dev==dev)found=TRUE;/*isitmountedalready*/26746if(xp->s_dev==NO_DEV)sp=xp;/*recordfreeslot*/26747}26748if(found)return(EBUSY);/*alreadymounted*/26749if(sp==NIL_SUPER)return(ENFILE);/*nosuperblockavailable*/2675026751/*Openthedevicethefilesystemliveson.
*/26752if(dev_open(dev,who,m_in.
rd_onlyR_BIT:(R_BIT|W_BIT))!
=OK)26753return(EINVAL);26754MINIXSOURCECODEFile:servers/fs/mount.
c86326755/*Makethecacheforgetaboutblocksithasopenonthefilesystem*/26756(void)do_sync();26757invalidate(dev);2675826759/*Fillinthesuperblock.
*/26760sp->s_dev=dev;/*read_super()needstoknowwhichdev*/26761r=read_super(sp);2676226763/*IsitrecognizedasaMinixfilesystem*/26764if(r!
=OK){26765dev_close(dev);26766sp->s_dev=NO_DEV;26767return(r);26768}2676926770/*Nowgettheinodeofthefiletobemountedon.
*/26771if(fetch_name(m_in.
name2,m_in.
name2_length,M1)!
=OK){26772dev_close(dev);26773sp->s_dev=NO_DEV;26774return(err_code);26775}26776if((rip=eat_path(user_path))==NIL_INODE){26777dev_close(dev);26778sp->s_dev=NO_DEV;26779return(err_code);26780}2678126782/*Itmaynotbebusy.
*/26783r=OK;26784if(rip->i_count>1)r=EBUSY;2678526786/*Itmaynotbespecial.
*/26787bits=rip->i_mode&I_TYPE;26788if(bits==I_BLOCK_SPECIAL||bits==I_CHAR_SPECIAL)r=ENOTDIR;2678926790/*Gettherootinodeofthemountedfilesystem.
*/26791root_ip=NIL_INODE;/*if'r'notOK,makesurethisisdefined*/26792if(r==OK){26793if((root_ip=get_inode(dev,ROOT_INODE))==NIL_INODE)r=err_code;26794}26795if(root_ip!
=NIL_INODE&&root_ip->i_mode==0){26796r=EINVAL;26797}2679826799/*Filetypesof'rip'and'root_ip'maynotconflict.
*/26800if(r==OK){26801mdir=((rip->i_mode&I_TYPE)==I_DIRECTORY);/*TRUEiffdir*/26802rdir=((root_ip->i_mode&I_TYPE)==I_DIRECTORY);26803if(!
mdir&&rdir)r=EISDIR;26804}2680526806/*Iferror,returnthesuperblockandbothinodes;releasethemaps.
*/26807if(r!
=OK){26808put_inode(rip);26809put_inode(root_ip);26810(void)do_sync();26811invalidate(dev);26812dev_close(dev);26813sp->s_dev=NO_DEV;26814return(r);864File:servers/fs/mount.
cMINIXSOURCECODE26815}2681626817/*Nothingelsecangowrong.
Performthemount.
*/26818rip->i_mount=I_MOUNT;/*thisbitsaystheinodeismountedon*/26819sp->s_imount=rip;26820sp->s_isup=root_ip;26821sp->s_rd_only=m_in.
rd_only;26822return(OK);26823}2682526826*do_umount*2682726828PUBLICintdo_umount()26829{26830/*Performtheumount(name)systemcall.
*/26831dev_tdev;2683226833/*Onlythesuper-usermaydoUMOUNT.
*/26834if(!
super_user)return(EPERM);2683526836/*If'name'isnotforablockspecialfile,returnerror.
*/26837if(fetch_name(m_in.
name,m_in.
name_length,M3)!
=OK)return(err_code);26838if((dev=name_to_dev(user_path))==NO_DEV)return(err_code);2683926840return(unmount(dev));26841}2684326844*unmount*2684526846PUBLICintunmount(dev)26847Dev_tdev;26848{26849/*Unmountafilesystembydevicenumber.
*/26850registerstructinode*rip;26851structsuper_block*sp,*sp1;26852intcount;2685326854/*Seeifthemounteddeviceisbusy.
Only1inodeusingitshouldbe26855*open--therootinode--andthatinodeonly1time.
26856*/26857count=0;26858for(rip=&inode[0];ripi_count>0&&rip->i_dev==dev)count+=rip->i_count;26860if(count>1)return(EBUSY);/*can'tumountabusyfilesystem*/2686126862/*Findthesuperblock.
*/26863sp=NIL_SUPER;26864for(sp1=&super_block[0];sp1s_dev==dev){26866sp=sp1;26867break;26868}26869}2687026871/*Syncthedisk,andinvalidatecache.
*/26872(void)do_sync();/*forceanycachedblocksoutofmemory*/26873invalidate(dev);/*invalidatecacheentriesforthisdev*/26874if(sp==NIL_SUPER){MINIXSOURCECODEFile:servers/fs/mount.
c86526875return(EINVAL);26876}2687726878/*Closethedevicethefilesystemliveson.
*/26879dev_close(dev);2688026881/*Finishofftheunmount.
*/26882sp->s_imount->i_mount=NO_MOUNT;/*inodereturnstonormal*/26883put_inode(sp->s_imount);/*releasetheinodemountedon*/26884put_inode(sp->s_isup);/*releasetherootinodeofthemountedfs*/26885sp->s_imount=NIL_INODE;26886sp->s_dev=NO_DEV;26887return(OK);26888}2689026891*name_to_dev*2689226893PRIVATEdev_tname_to_dev(path)26894char*path;/*pointertopathname*/26895{26896/*Converttheblockspecialfile'path'toadevicenumber.
If'path'26897*isnotablockspecialfile,returnerrorcodein'err_code'.
26898*/2689926900registerstructinode*rip;26901registerdev_tdev;2690226903/*If'path'can'tbeopened,giveupimmediately.
*/26904if((rip=eat_path(path))==NIL_INODE)return(NO_DEV);2690526906/*If'path'isnotablockspecialfile,returnerror.
*/26907if((rip->i_mode&I_TYPE)!
=I_BLOCK_SPECIAL){26908err_code=ENOTBLK;26909put_inode(rip);26910return(NO_DEV);26911}2691226913/*Extractthedevicenumber.
*/26914dev=(dev_t)rip->i_zone[0];26915put_inode(rip);26916return(dev);26917}servers/fs/link.
c27000/*ThisfilehandlestheLINKandUNLINKsystemcalls.
Italsodealswith27001*deallocatingthestorageusedbyafilewhenthelastUNLINKisdonetoa27002*fileandtheblocksmustbereturnedtothefreeblockpool.
27003*27004*Theentrypointsintothisfileare27005*do_link:performtheLINKsystemcall27006*do_unlink:performtheUNLINKandRMDIRsystemcalls27007*do_rename:performtheRENAMEsystemcall27008*truncate:releasealltheblocksassociatedwithaninode27009*/866File:servers/fs/link.
cMINIXSOURCECODE2701027011#include"fs.
h"27012#include27013#include27014#include27015#include27016#include"buf.
h"27017#include"file.
h"27018#include"fproc.
h"27019#include"inode.
h"27020#include"param.
h"27021#include"super.
h"2702227023#defineSAME10002702427025FORWARD_PROTOTYPE(intremove_dir,(structinode*rldirp,structinode*rip,27026chardir_name[NAME_MAX]));2702727028FORWARD_PROTOTYPE(intunlink_file,(structinode*dirp,structinode*rip,27029charfile_name[NAME_MAX]));270302703127032*do_link*2703327034PUBLICintdo_link()27035{27036/*Performthelink(name1,name2)systemcall.
*/2703727038registerstructinode*ip,*rip;27039registerintr;27040charstring[NAME_MAX];27041structinode*new_ip;2704227043/*Seeif'name'(filetobelinked)exists.
*/27044if(fetch_name(m_in.
name1,m_in.
name1_length,M1)!
=OK)return(err_code);27045if((rip=eat_path(user_path))==NIL_INODE)return(err_code);2704627047/*Checktoseeifthefilehasmaximumnumberoflinksalready.
*/27048r=OK;27049if(rip->i_nlinks>=(rip->i_sp->s_version==V1CHAR_MAX:SHRT_MAX))27050r=EMLINK;2705127052/*Onlysuper_usermaylinktodirectories.
*/27053if(r==OK)27054if((rip->i_mode&I_TYPE)==I_DIRECTORY&&!
super_user)r=EPERM;2705527056/*Iferrorwith'name',returntheinode.
*/27057if(r!
=OK){27058put_inode(rip);27059return(r);27060}2706127062/*Doesthefinaldirectoryof'name2'exist*/27063if(fetch_name(m_in.
name2,m_in.
name2_length,M1)!
=OK){27064put_inode(rip);27065return(err_code);27066}27067if((ip=last_dir(user_path,string))==NIL_INODE)r=err_code;2706827069/*If'name2'existsinfull(evenifnospace)set'r'toerror.
*/MINIXSOURCECODEFile:servers/fs/link.
c86727070if(r==OK){27071if((new_ip=advance(ip,string))==NIL_INODE){27072r=err_code;27073if(r==ENOENT)r=OK;27074}else{27075put_inode(new_ip);27076r=EEXIST;27077}27078}2707927080/*Checkforlinksacrossdevices.
*/27081if(r==OK)27082if(rip->i_dev!
=ip->i_dev)r=EXDEV;2708327084/*Trytolink.
*/27085if(r==OK)27086r=search_dir(ip,string,&rip->i_num,ENTER);2708727088/*Ifsuccess,registerthelinking.
*/27089if(r==OK){27090rip->i_nlinks++;27091rip->i_update|=CTIME;27092rip->i_dirt=DIRTY;27093}2709427095/*Done.
Releasebothinodes.
*/27096put_inode(rip);27097put_inode(ip);27098return(r);27099}2710127102*do_unlink*2710327104PUBLICintdo_unlink()27105{27106/*Performtheunlink(name)orrmdir(name)systemcall.
Thecodeforthesetwo27107*isalmostthesame.
Theydifferonlyinsomeconditiontesting.
Unlink()27108*maybeusedbythesuperusertododangerousthings;rmdir()maynot.
27109*/2711027111registerstructinode*rip;27112structinode*rldirp;27113intr;27114charstring[NAME_MAX];2711527116/*Getthelastdirectoryinthepath.
*/27117if(fetch_name(m_in.
name,m_in.
name_length,M3)!
=OK)return(err_code);27118if((rldirp=last_dir(user_path,string))==NIL_INODE)27119return(err_code);2712027121/*Thelastdirectoryexists.
Doesthefilealsoexist*/27122r=OK;27123if((rip=advance(rldirp,string))==NIL_INODE)r=err_code;2712427125/*Iferror,returninode.
*/27126if(r!
=OK){27127put_inode(rldirp);27128return(r);27129}868File:servers/fs/link.
cMINIXSOURCECODE2713027131/*Donotremoveamountpoint.
*/27132if(rip->i_num==ROOT_INODE){27133put_inode(rldirp);27134put_inode(rip);27135return(EBUSY);27136}2713727138/*Nowtestifthecallisallowed,separatelyforunlink()andrmdir().
*/27139if(call_nr==UNLINK){27140/*Onlythesumayunlinkdirectories,butthesucanunlinkanydir.
*/27141if((rip->i_mode&I_TYPE)==I_DIRECTORY&&!
super_user)r=EPERM;2714227143/*Don'tunlinkafileifitistherootofamountedfilesystem.
*/27144if(rip->i_num==ROOT_INODE)r=EBUSY;2714527146/*Actuallytrytounlinkthefile;failsifparentismode0etc.
*/27147if(r==OK)r=unlink_file(rldirp,rip,string);2714827149}else{27150r=remove_dir(rldirp,rip,string);/*callisRMDIR*/27151}2715227153/*Ifunlinkwaspossible,ithasbeendone,otherwiseithasnot.
*/27154put_inode(rip);27155put_inode(rldirp);27156return(r);27157}2715927160*do_rename*2716127162PUBLICintdo_rename()27163{27164/*Performtherename(name1,name2)systemcall.
*/2716527166structinode*old_dirp,*old_ip;/*ptrstoolddir,fileinodes*/27167structinode*new_dirp,*new_ip;/*ptrstonewdir,fileinodes*/27168structinode*new_superdirp,*next_new_superdirp;27169intr=OK;/*errorflag;initiallynoerror*/27170intodir,ndir;/*TRUEiff{old|new}fileisdir*/27171intsame_pdir;/*TRUEiffparentdirsarethesame*/27172charold_name[NAME_MAX],new_name[NAME_MAX];27173ino_tnumb;27174intr1;2717527176/*Seeif'name1'(existingfile)exists.
Getdirandfileinodes.
*/27177if(fetch_name(m_in.
name1,m_in.
name1_length,M1)!
=OK)return(err_code);27178if((old_dirp=last_dir(user_path,old_name))==NIL_INODE)return(err_code);2717927180if((old_ip=advance(old_dirp,old_name))==NIL_INODE)r=err_code;2718127182/*Seeif'name2'(newname)exists.
Getdirandfileinodes.
*/27183if(fetch_name(m_in.
name2,m_in.
name2_length,M1)!
=OK)r=err_code;27184if((new_dirp=last_dir(user_path,new_name))==NIL_INODE)r=err_code;27185new_ip=advance(new_dirp,new_name);/*notrequiredtoexist*/2718627187if(old_ip!
=NIL_INODE)27188odir=((old_ip->i_mode&I_TYPE)==I_DIRECTORY);/*TRUEiffdir*/27189MINIXSOURCECODEFile:servers/fs/link.
c86927190/*Ifitisok,checkforavarietyofpossibleerrors.
*/27191if(r==OK){27192same_pdir=(old_dirp==new_dirp);2719327194/*Theoldinodemustnotbeasuperdirectoryofthenewlastdir.
*/27195if(odir&&!
same_pdir){27196dup_inode(new_superdirp=new_dirp);27197while(TRUE){/*mayhanginafilesystemloop*/27198if(new_superdirp==old_ip){27199r=EINVAL;27200break;27201}27202next_new_superdirp=advance(new_superdirp,dot2);27203put_inode(new_superdirp);27204if(next_new_superdirp==new_superdirp)27205break;/*backatsystemrootdirectory*/27206new_superdirp=next_new_superdirp;27207if(new_superdirp==NIL_INODE){27208/*Missing".
.
"entry.
Assumetheworst.
*/27209r=EINVAL;27210break;27211}27212}27213put_inode(new_superdirp);27214}2721527216/*Theoldornewnamemustnotbe.
or.
.
*/27217if(strcmp(old_name,".
")==0||strcmp(old_name,0||27218strcmp(new_name,".
")==0||strcmp(new_name,0)r=EINVAL;2721927220/*Bothparentdirectoriesmustbeonthesamedevice.
*/27221if(old_dirp->i_dev!
=new_dirp->i_dev)r=EXDEV;2722227223/*Parentdirsmustbewritable,searchableandonawritabledevice*/27224if((r1=forbidden(old_dirp,W_BIT|X_BIT))!
=OK||27225(r1=forbidden(new_dirp,W_BIT|X_BIT))!
=OK)r=r1;2722627227/*Sometestsapplyonlyifthenewpathexists.
*/27228if(new_ip==NIL_INODE){27229/*don'trenameafilewithafilesystemmountedonit.
*/27230if(old_ip->i_dev!
=old_dirp->i_dev)r=EXDEV;27231if(odir&&new_dirp->i_nlinks>=27232(new_dirp->i_sp->s_version==V1CHAR_MAX:SHRT_MAX)&&27233!
same_pdir&&r==OK)r=EMLINK;27234}else{27235if(old_ip==new_ip)r=SAME;/*old=new*/2723627237/*hastheoldfileornewfileafilesystemmountedonit*/27238if(old_ip->i_dev!
=new_ip->i_dev)r=EXDEV;2723927240ndir=((new_ip->i_mode&I_TYPE)==I_DIRECTORY);/*dir*/27241if(odir==TRUE&&ndir==FALSE)r=ENOTDIR;27242if(odir==FALSE&&ndir==TRUE)r=EISDIR;27243}27244}2724527246/*Ifaprocesshasanotherrootdirectorythanthesystemroot,wemight27247*"accidently"bemovingit'sworkingdirectorytoaplacewhereit's27248*rootdirectoryisn'tasuperdirectoryofitanymore.
Thiscanmake27249*thefunctionchrootuseless.
Ifchrootwillbeusedoftenweshould870File:servers/fs/link.
cMINIXSOURCECODE27250*probablycheckforithere.
27251*/2725227253/*Therenamewillprobablywork.
Onlytwothingscangowrongnow:27254*1.
beingunabletoremovethenewfile.
(whennewfilealreadyexists)27255*2.
beingunabletomakethenewdirectoryentry.
(newfiledoesn'texists)27256*[directoryhastogrowbyoneblockandcannotbecausethedisk27257*iscompletelyfull].
27258*/27259if(r==OK){27260if(new_ip!
=NIL_INODE){27261/*Thereisalreadyanentryfor'new'.
Trytoremoveit.
*/27262if(odir)27263r=remove_dir(new_dirp,new_ip,new_name);27264else27265r=unlink_file(new_dirp,new_ip,new_name);27266}27267/*ifrisOK,therenamewillsucceed,whilethereisnowan27268*unusedentryinthenewparentdirectory.
27269*/27270}2727127272if(r==OK){27273/*Ifthenewnamewillbeinthesameparentdirectoryastheoldone,27274*firstremovetheoldnametofreeanentryforthenewname,27275*otherwisefirsttrytocreatethenewnameentrytomakesure27276*therenamewillsucceed.
27277*/27278numb=old_ip->i_num;/*inodenumberofoldfile*/2727927280if(same_pdir){27281r=search_dir(old_dirp,old_name,(ino_t*)0,DELETE);27282/*shouldn'tgowrong.
*/27283if(r==OK)(void)search_dir(old_dirp,new_name,&numb,ENTER);27284}else{27285r=search_dir(new_dirp,new_name,&numb,ENTER);27286if(r==OK)27287(void)search_dir(old_dirp,old_name,(ino_t*)0,DELETE);27288}27289}27290/*IfrisOK,thectimeandmtimeofold_dirpandnew_dirphavebeenmarked27291*forupdateinsearch_dir.
27292*/2729327294if(r==OK&&odir&&!
same_pdir){27295/*Updatethe.
.
entryinthedirectory(stillpointstoold_dirp).
*/27296numb=new_dirp->i_num;27297(void)unlink_file(old_ip,NIL_INODE,dot2);27298if(search_dir(old_ip,dot2,&numb,ENTER)==OK){27299/*Newlinkcreated.
*/27300new_dirp->i_nlinks++;27301new_dirp->i_dirt=DIRTY;27302}27303}2730427305/*Releasetheinodes.
*/27306put_inode(old_dirp);27307put_inode(old_ip);27308put_inode(new_dirp);27309put_inode(new_ip);MINIXSOURCECODEFile:servers/fs/link.
c87127310return(r==SAMEOK:r);27311}2731327314*truncate*2731527316PUBLICvoidtruncate(rip)27317registerstructinode*rip;/*pointertoinodetobetruncated*/27318{27319/*Removeallthezonesfromtheinode'rip'andmarkitdirty.
*/2732027321registerblock_tb;27322zone_tz,zone_size,z1;27323off_tposition;27324inti,scale,file_type,waspipe,single,nr_indirects;27325structbuf*bp;27326dev_tdev;2732727328file_type=rip->i_mode&I_TYPE;/*checktoseeiffileisspecial*/27329if(file_type==I_CHAR_SPECIAL||file_type==I_BLOCK_SPECIAL)return;27330dev=rip->i_dev;/*deviceonwhichinoderesides*/27331scale=rip->i_sp->s_log_zone_size;27332zone_size=(zone_t)rip->i_sp->s_block_sizei_nindirs;2733427335/*Pipescanshrink,soadjustsizetomakesureallzonesareremoved.
*/27336waspipe=rip->i_pipe==I_PIPE;/*TRUEisthiswasapipe*/27337if(waspipe)rip->i_size=PIPE_SIZE(rip->i_sp->s_block_size);2733827339/*Stepthroughthefileazoneatatime,findingandfreeingthezones.
*/27340for(position=0;positioni_size;position+=zone_size){27341if((b=read_map(rip,position))!
=NO_BLOCK){27342z=(zone_t)b>>scale;27343free_zone(dev,z);27344}27345}2734627347/*Allthedatazoneshavebeenfreed.
Nowfreetheindirectzones.
*/27348rip->i_dirt=DIRTY;27349if(waspipe){27350wipe_inode(rip);/*clearoutinodeforpipes*/27351return;/*indirectslotscontainfilepositions*/27352}27353single=rip->i_ndzones;27354free_zone(dev,rip->i_zone[single]);/*singleindirectzone*/27355if((z=rip->i_zone[single+1])!
=NO_ZONE){27356/*Freeallthesingleindirectzonespointedtobythedouble.
*/27357b=(block_t)zi_num==ROOT_INODE)return(EBUSY);/*can'tremove'root'*/2739627397for(rfp=&fproc[INIT_PROC_NR+1];rfpfp_workdir==rip||rfp->fp_rootdir==rip)return(EBUSY);27399/*can'tremoveanybody'sworkingdir*/2740027401/*Actuallytrytounlinkthefile;failsifparentismode0etc.
*/27402if((r=unlink_file(rldirp,rip,dir_name))!
=OK)returnr;2740327404/*Unlink.
and.
.
fromthedir.
Thesuperusercanlinkandunlinkanydir,27405*sodon'tmaketoomanyassumptionsaboutthem.
27406*/27407(void)unlink_file(rip,NIL_INODE,dot1);27408(void)unlink_file(rip,NIL_INODE,dot2);27409return(OK);27410}2741227413*unlink_file*2741427415PRIVATEintunlink_file(dirp,rip,file_name)27416structinode*dirp;/*parentdirectoryoffile*/27417structinode*rip;/*inodeoffile,maybeNIL_INODEtoo.
*/27418charfile_name[NAME_MAX];/*nameoffiletoberemoved*/27419{27420/*Unlink'file_name';ripmustbetheinodeof'file_name'orNIL_INODE.
*/2742127422ino_tnumb;/*inodenumber*/27423intr;2742427425/*IfripisnotNIL_INODE,itisusedtogetfasteraccesstotheinode.
*/27426if(rip==NIL_INODE){27427/*Searchforfileindirectoryandtrytogetitsinode.
*/27428err_code=search_dir(dirp,file_name,&numb,LOOK_UP);27429if(err_code==OK)rip=get_inode(dirp->i_dev,(int)numb);MINIXSOURCECODEFile:servers/fs/link.
c87327430if(err_code!
=OK||rip==NIL_INODE)return(err_code);27431}else{27432dup_inode(rip);/*inodewillbereturnedwithput_inode*/27433}2743427435r=search_dir(dirp,file_name,(ino_t*)0,DELETE);2743627437if(r==OK){27438rip->i_nlinks--;/*entrydeletedfromparent'sdir*/27439rip->i_update|=CTIME;27440rip->i_dirt=DIRTY;27441}2744227443put_inode(rip);27444return(r);27445}servers/fs/stadir.
c27500/*Thisfilecontainsthecodeforperformingfoursystemcallsrelatingto27501*statusanddirectories.
27502*27503*Theentrypointsintothisfileare27504*do_chdir:performtheCHDIRsystemcall27505*do_chroot:performtheCHROOTsystemcall27506*do_stat:performtheSTATsystemcall27507*do_fstat:performtheFSTATsystemcall27508*do_fstatfs:performtheFSTATFSsystemcall27509*/2751027511#include"fs.
h"27512#include27513#include27514#include27515#include"file.
h"27516#include"fproc.
h"27517#include"inode.
h"27518#include"param.
h"27519#include"super.
h"2752027521FORWARD_PROTOTYPE(intchange,(structinode**iip,char*name_ptr,intlen));27522FORWARD_PROTOTYPE(intchange_into,(structinode**iip,structinode*ip));27523FORWARD_PROTOTYPE(intstat_inode,(structinode*rip,structfilp*fil_ptr,27524char*user_addr));275252752627527*do_fchdir*2752827529PUBLICintdo_fchdir()27530{27531/*Changedirectoryonalready-openedfd.
*/27532structfilp*rfilp;2753327534/*Isthefiledescriptorvalid*/874File:servers/fs/stadir.
cMINIXSOURCECODE27535if((rfilp=get_filp(m_in.
fd))==NIL_FILP)return(err_code);27536returnchange_into(&fp->fp_workdir,rfilp->filp_ino);27537}2753927540*do_chdir*2754127542PUBLICintdo_chdir()27543{27544/*Changedirectory.
ThisfunctionisalsocalledbyMMtosimulateachdir27545*inordertodoEXEC,etc.
Italsochangestherootdirectory,theuidsand27546*gids,andtheumask.
27547*/2754827549intr;27550registerstructfproc*rfp;2755127552if(who==PM_PROC_NR){27553rfp=&fproc[m_in.
slot1];27554put_inode(fp->fp_rootdir);27555dup_inode(fp->fp_rootdir=rfp->fp_rootdir);27556put_inode(fp->fp_workdir);27557dup_inode(fp->fp_workdir=rfp->fp_workdir);2755827559/*MMusesaccess()tocheckpermissions.
Tomakethiswork,pretend27560*thattheuser'srealidsarethesameastheuser'seffectiveids.
27561*FScallsotherthanaccess()donotusetherealids,soarenot27562*affected.
27563*/27564fp->fp_realuid=27565fp->fp_effuid=rfp->fp_effuid;27566fp->fp_realgid=27567fp->fp_effgid=rfp->fp_effgid;27568fp->fp_umask=rfp->fp_umask;27569return(OK);27570}2757127572/*Performthechdir(name)systemcall.
*/27573r=change(&fp->fp_workdir,m_in.
name,m_in.
name_length);27574return(r);27575}2757727578*do_chroot*2757927580PUBLICintdo_chroot()27581{27582/*Performthechroot(name)systemcall.
*/2758327584registerintr;2758527586if(!
super_user)return(EPERM);/*onlysumaychroot()*/27587r=change(&fp->fp_rootdir,m_in.
name,m_in.
name_length);27588return(r);27589}MINIXSOURCECODEFile:servers/fs/stadir.
c8752759127592*change*2759327594PRIVATEintchange(iip,name_ptr,len)27595structinode**iip;/*pointertotheinodepointerforthedir*/27596char*name_ptr;/*pointertothedirectorynametochangeto*/27597intlen;/*lengthofthedirectorynamestring*/27598{27599/*Dotheactualworkforchdir()andchroot().
*/27600structinode*rip;2760127602/*Trytoopenthenewdirectory.
*/27603if(fetch_name(name_ptr,len,M3)!
=OK)return(err_code);27604if((rip=eat_path(user_path))==NIL_INODE)return(err_code);27605returnchange_into(iip,rip);27606}2760827609*change_into*2761027611PRIVATEintchange_into(iip,rip)27612structinode**iip;/*pointertotheinodepointerforthedir*/27613structinode*rip;/*thisiswhattheinodehastobecome*/27614{27615registerintr;2761627617/*Itmustbeadirectoryandalsobesearchable.
*/27618if((rip->i_mode&I_TYPE)!
=I_DIRECTORY)27619r=ENOTDIR;27620else27621r=forbidden(rip,X_BIT);/*checkifdirissearchable*/2762227623/*Iferror,returninode.
*/27624if(r!
=OK){27625put_inode(rip);27626return(r);27627}2762827629/*EverythingisOK.
Makethechange.
*/27630put_inode(*iip);/*releasetheolddirectory*/27631*iip=rip;/*acquirethenewone*/27632return(OK);27633}2763527636*do_stat*2763727638PUBLICintdo_stat()27639{27640/*Performthestat(name,buf)systemcall.
*/2764127642registerstructinode*rip;27643registerintr;2764427645/*Bothstat()andfstat()usethesameroutinetodotherealwork.
That27646*routineexpectsaninode,soacquireittemporarily.
27647*/27648if(fetch_name(m_in.
name1,m_in.
name1_length,M1)!
=OK)return(err_code);27649if((rip=eat_path(user_path))==NIL_INODE)return(err_code);27650r=stat_inode(rip,NIL_FILP,m_in.
name2);/*actuallydothework.
*/876File:servers/fs/stadir.
cMINIXSOURCECODE27651put_inode(rip);/*releasetheinode*/27652return(r);27653}2765527656*do_fstat*2765727658PUBLICintdo_fstat()27659{27660/*Performthefstat(fd,buf)systemcall.
*/2766127662registerstructfilp*rfilp;2766327664/*Isthefiledescriptorvalid*/27665if((rfilp=get_filp(m_in.
fd))==NIL_FILP)return(err_code);2766627667return(stat_inode(rfilp->filp_ino,rfilp,m_in.
buffer));27668}2767027671*stat_inode*2767227673PRIVATEintstat_inode(rip,fil_ptr,user_addr)27674registerstructinode*rip;/*pointertoinodetostat*/27675structfilp*fil_ptr;/*filppointer,suppliedby'fstat'*/27676char*user_addr;/*userspaceaddresswherestatbufgoes*/27677{27678/*Commoncodeforstatandfstatsystemcalls.
*/2767927680structstatstatbuf;27681mode_tmo;27682intr,s;2768327684/*Updatetheatime,ctime,andmtimefieldsintheinode,ifneedbe.
*/27685if(rip->i_update)update_times(rip);2768627687/*Fillinthestatbufstruct.
*/27688mo=rip->i_mode&I_TYPE;2768927690/*trueiffspecial*/27691s=(mo==I_CHAR_SPECIAL||mo==I_BLOCK_SPECIAL);2769227693statbuf.
st_dev=rip->i_dev;27694statbuf.
st_ino=rip->i_num;27695statbuf.
st_mode=rip->i_mode;27696statbuf.
st_nlink=rip->i_nlinks;27697statbuf.
st_uid=rip->i_uid;27698statbuf.
st_gid=rip->i_gid;27699statbuf.
st_rdev=(dev_t)(srip->i_zone[0]:NO_DEV);27700statbuf.
st_size=rip->i_size;2770127702if(rip->i_pipe==I_PIPE){27703statbuf.
st_mode&=I_REGULAR;/*wipeoutI_REGULARbitforpipes*/27704if(fil_ptr!
=NIL_FILP&&fil_ptr->filp_mode&R_BIT)27705statbuf.
st_size-=fil_ptr->filp_pos;27706}2770727708statbuf.
st_atime=rip->i_atime;27709statbuf.
st_mtime=rip->i_mtime;27710statbuf.
st_ctime=rip->i_ctime;MINIXSOURCECODEFile:servers/fs/stadir.
c8772771127712/*Copythestructtouserspace.
*/27713r=sys_datacopy(FS_PROC_NR,(vir_bytes)&statbuf,27714who,(vir_bytes)user_addr,(phys_bytes)sizeof(statbuf));27715return(r);27716}2771827719*do_fstatfs*2772027721PUBLICintdo_fstatfs()27722{27723/*Performthefstatfs(fd,buf)systemcall.
*/27724structstatfsst;27725registerstructfilp*rfilp;27726intr;2772727728/*Isthefiledescriptorvalid*/27729if((rfilp=get_filp(m_in.
fd))==NIL_FILP)return(err_code);2773027731st.
f_bsize=rfilp->filp_ino->i_sp->s_block_size;2773227733r=sys_datacopy(FS_PROC_NR,(vir_bytes)&st,27734who,(vir_bytes)m_in.
buffer,(phys_bytes)sizeof(st));2773527736return(r);27737}servers/fs/protect.
c27800/*Thisfiledealswithprotectioninthefilesystem.
Itcontainsthecode27801*forfoursystemcallsthatrelatetoprotection.
27802*27803*Theentrypointsintothisfileare27804*do_chmod:performtheCHMODsystemcall27805*do_chown:performtheCHOWNsystemcall27806*do_umask:performtheUMASKsystemcall27807*do_access:performtheACCESSsystemcall27808*forbidden:checktoseeifagivenaccessisallowedonagiveninode27809*/2781027811#include"fs.
h"27812#include27813#include27814#include"buf.
h"27815#include"file.
h"27816#include"fproc.
h"27817#include"inode.
h"27818#include"param.
h"27819#include"super.
h"27820878File:servers/fs/protect.
cMINIXSOURCECODE2782127822*do_chmod*2782327824PUBLICintdo_chmod()27825{27826/*Performthechmod(name,mode)systemcall.
*/2782727828registerstructinode*rip;27829registerintr;2783027831/*Temporarilyopenthefile.
*/27832if(fetch_name(m_in.
name,m_in.
name_length,M3)!
=OK)return(err_code);27833if((rip=eat_path(user_path))==NIL_INODE)return(err_code);2783427835/*Onlytheownerorthesuper_usermaychangethemodeofafile.
27836*Noonemaychangethemodeofafileonaread-onlyfilesystem.
27837*/27838if(rip->i_uid!
=fp->fp_effuid&&!
super_user)27839r=EPERM;27840else27841r=read_only(rip);2784227843/*Iferror,returninode.
*/27844if(r!
=OK){27845put_inode(rip);27846return(r);27847}2784827849/*Nowmakethechange.
Clearsetgidbitiffileisnotincaller'sgrp*/27850rip->i_mode=(rip->i_mode&ALL_MODES)|(m_in.
mode&ALL_MODES);27851if(!
super_user&&rip->i_gid!
=fp->fp_effgid)rip->i_mode&=I_SET_GID_BIT;27852rip->i_update|=CTIME;27853rip->i_dirt=DIRTY;2785427855put_inode(rip);27856return(OK);27857}2785927860*do_chown*2786127862PUBLICintdo_chown()27863{27864/*Performthechown(name,owner,group)systemcall.
*/2786527866registerstructinode*rip;27867registerintr;2786827869/*Temporarilyopenthefile.
*/27870if(fetch_name(m_in.
name1,m_in.
name1_length,M1)!
=OK)return(err_code);27871if((rip=eat_path(user_path))==NIL_INODE)return(err_code);2787227873/*Notpermittedtochangetheownerofafileonaread-onlyfilesys.
*/27874r=read_only(rip);27875if(r==OK){27876/*FSisR/W.
Whethercallisalloweddependsonownership,etc.
*/27877if(super_user){27878/*Thesuperusercandoanything.
*/27879rip->i_uid=m_in.
owner;/*otherslater*/27880}else{MINIXSOURCECODEFile:servers/fs/protect.
c87927881/*Regularuserscanonlychangegroupsoftheirownfiles.
*/27882if(rip->i_uid!
=fp->fp_effuid)r=EPERM;27883if(rip->i_uid!
=m_in.
owner)r=EPERM;/*nogivingaway*/27884if(fp->fp_effgid!
=m_in.
group)r=EPERM;27885}27886}27887if(r==OK){27888rip->i_gid=m_in.
group;27889rip->i_mode&=(I_SET_UID_BIT|I_SET_GID_BIT);27890rip->i_update|=CTIME;27891rip->i_dirt=DIRTY;27892}2789327894put_inode(rip);27895return(r);27896}2789827899*do_umask*2790027901PUBLICintdo_umask()27902{27903/*Performtheumask(co_mode)systemcall.
*/27904registermode_tr;2790527906r=fp->fp_umask;/*set'r'tocomplementofoldmask*/27907fp->fp_umask=(m_in.
co_mode&RWX_MODES);27908return(r);/*returncomplementofoldmask*/27909}2791127912*do_access*2791327914PUBLICintdo_access()27915{27916/*Performtheaccess(name,mode)systemcall.
*/2791727918structinode*rip;27919registerintr;2792027921/*Firstchecktoseeifthemodeiscorrect.
*/27922if((m_in.
mode&(R_OK|W_OK|X_OK))!
=0&&m_in.
mode!
=F_OK)27923return(EINVAL);2792427925/*Temporarilyopenthefilewhoseaccessistobechecked.
*/27926if(fetch_name(m_in.
name,m_in.
name_length,M3)!
=OK)return(err_code);27927if((rip=eat_path(user_path))==NIL_INODE)return(err_code);2792827929/*Nowcheckthepermissions.
*/27930r=forbidden(rip,(mode_t)m_in.
mode);27931put_inode(rip);27932return(r);27933}2793527936*forbidden*2793727938PUBLICintforbidden(registerstructinode*rip,mode_taccess_desired)27939{27940/*Givenapointertoaninode,'rip',andtheaccessdesired,determine880File:servers/fs/protect.
cMINIXSOURCECODE27941*iftheaccessisallowed,andifnotwhynot.
Theroutinelooksupthe27942*caller'suidinthe'fproc'table.
Ifaccessisallowed,OKisreturned27943*ifitisforbidden,EACCESisreturned.
27944*/2794527946registerstructinode*old_rip=rip;27947registerstructsuper_block*sp;27948registermode_tbits,perm_bits;27949intr,shift,test_uid,test_gid,type;2795027951if(rip->i_mount==I_MOUNT)/*Theinodeismountedon.
*/27952for(sp=&super_block[1];sps_imount==rip){27954rip=get_inode(sp->s_dev,ROOT_INODE);27955break;27956}/*if*/2795727958/*Isolatetherelevantrwxbitsfromthemode.
*/27959bits=rip->i_mode;27960test_uid=(call_nr==ACCESSfp->fp_realuid:fp->fp_effuid);27961test_gid=(call_nr==ACCESSfp->fp_realgid:fp->fp_effgid);27962if(test_uid==SU_UID){27963/*Grantreadandwritepermission.
Grantsearchpermissionfor27964*directories.
Grantexecutepermission(fornon-directories)if27965*andonlyifoneofthe'X'bitsisset.
27966*/27967if((bits&I_TYPE)==I_DIRECTORY||27968bits&((X_BITi_uid)shift=6;/*owner*/27974elseif(test_gid==rip->i_gid)shift=3;/*group*/27975elseshift=0;/*other*/27976perm_bits=(bits>>shift)&(R_BIT|W_BIT|X_BIT);27977}2797827979/*Ifaccessdesiredisnotasubsetofwhatisallowed,itisrefused.
*/27980r=OK;27981if((perm_bits|access_desired)!
=perm_bits)r=EACCES;2798227983/*Checktoseeifsomeoneistryingtowriteonafilesystemthatis27984*mountedread-only.
27985*/27986type=rip->i_mode&I_TYPE;27987if(r==OK)27988if(access_desired&W_BIT)27989r=read_only(rip);2799027991if(rip!
=old_rip)put_inode(rip);2799227993return(r);27994}2799627997*read_only*2799827999PUBLICintread_only(ip)28000structinode*ip;/*ptrtoinodewhosefilesysistobecked*/MINIXSOURCECODEFile:servers/fs/protect.
c88128001{28002/*Checktoseeifthefilesystemonwhichtheinode'ip'residesismounted28003*readonly.
Ifso,returnEROFS,elsereturnOK.
28004*/2800528006registerstructsuper_block*sp;2800728008sp=ip->i_sp;28009return(sp->s_rd_onlyEROFS:OK);28010}servers/fs/dmap.
c28100/*Thisfilecontainsthetablewithdevicedrivermappings.
Italso28101*containssomeroutinestodynamicallyaddand/orremovedevicedrivers28102*orchangemappings.
28103*/2810428105#include"fs.
h"28106#include"fproc.
h"28107#include28108#include28109#include28110#include28111#include28112#include"param.
h"2811328114/*Somedevicesmayormaynotbethereinthenexttable.
*/28115#defineDT(enable,opcl,io,driver,flags)\28116{(enable(opcl):no_dev),(enable(io):0),\28117(enable(driver):0),(flags)},28118#defineNC(x)(NR_CTRLRS>=(x))2811928120/*Theorderoftheentriesheredeterminesthemappingbetweenmajordevice28121*numbersandtasks.
Thefirstentry(majordevice0)isnotused.
The28122*nextentryismajordevice1,etc.
Characterandblockdevicescanbe28123*intermixedatrandom.
Theorderingdeterminesthedevicenumbersin/dev/.
28124*NotethatFSknowsthedevicenumberof/dev/ram/toloadtheRAMdisk.
28125*Alsonotethatthemajordevicenumbersusedin/dev/areNOTthesameas28126*theprocessnumbersofthedevicedrivers.
28127*/28128/*28129DriverenabledOpen/ClsI/ODriver#FlagsDeviceFile2813028131*/28132structdmapdmap[NR_DEVICES];/*actualmap*/28133PRIVATEstructdmapinit_dmap[]={28134DT(1,no_dev,0,0,0)/*0=notused*/28135DT(1,gen_opcl,gen_io,MEM_PROC_NR,0)/*1=/dev/mem*/28136DT(0,no_dev,0,0,DMAP_MUTABLE)/*2=/dev/fd0*/28137DT(0,no_dev,0,0,DMAP_MUTABLE)/*3=/dev/c0*/28138DT(1,tty_opcl,gen_io,TTY_PROC_NR,0)/*4=/dev/tty00*/28139DT(1,ctty_opcl,ctty_io,TTY_PROC_NR,0)/*5=/dev/tty*/28140DT(0,no_dev,0,NONE,DMAP_MUTABLE)/*6=/dev/lp*/28141DT(1,no_dev,0,0,DMAP_MUTABLE)/*7=/dev/ip*/28142DT(0,no_dev,0,NONE,DMAP_MUTABLE)/*8=/dev/c1*/28143DT(0,0,0,0,DMAP_MUTABLE)/*9=notused*/28144DT(0,no_dev,0,0,DMAP_MUTABLE)/*10=/dev/c2*/882File:servers/fs/dmap.
cMINIXSOURCECODE28145DT(0,0,0,0,DMAP_MUTABLE)/*11=notused*/28146DT(0,no_dev,0,NONE,DMAP_MUTABLE)/*12=/dev/c3*/28147DT(0,no_dev,0,NONE,DMAP_MUTABLE)/*13=/dev/audio*/28148DT(0,no_dev,0,NONE,DMAP_MUTABLE)/*14=/dev/mixer*/28149DT(1,gen_opcl,gen_io,LOG_PROC_NR,0)/*15=/dev/klog*/28150DT(0,no_dev,0,NONE,DMAP_MUTABLE)/*16=/dev/random*/28151DT(0,no_dev,0,NONE,DMAP_MUTABLE)/*17=/dev/cmos*/28152};281532815428155*do_devctl*2815628157PUBLICintdo_devctl()28158{28159intresult;2816028161switch(m_in.
ctl_req){28162caseDEV_MAP:28163/*Trytoupdatedevicemapping.
*/28164result=map_driver(m_in.
dev_nr,m_in.
driver_nr,m_in.
dev_style);28165break;28166caseDEV_UNMAP:28167result=ENOSYS;28168break;28169default:28170result=EINVAL;28171}28172return(result);28173}2817528176*map_driver*2817728178PUBLICintmap_driver(major,proc_nr,style)28179intmajor;/*majornumberofthedevice*/28180intproc_nr;/*processnumberofthedriver*/28181intstyle;/*styleofthedevice*/28182{28183/*Setanewdevicedrivermappinginthedmaptable.
Giventhatcorrect28184*argumentsaregiven,thisonlyworksiftheentryismutableandthe28185*currentdriverisnotbusy.
28186*Normalerrorcodesarereturnedsothatthisfunctioncanbeusedfrom28187*asystemcallthattriestodynamicallyinstallanewdriver.
28188*/28189structdmap*dp;2819028191/*Getpointertodeviceentryinthedmaptable.
*/28192if(major>=NR_DEVICES)return(ENODEV);28193dp=&dmap[major];2819428195/*Seeifupdatingtheentryisallowed.
*/28196if(!
(dp->dmap_flags&DMAP_MUTABLE))return(EPERM);28197if(dp->dmap_flags&DMAP_BUSY)return(EBUSY);2819828199/*Checkprocessnumberofnewdriver.
*/28200if(!
isokprocnr(proc_nr))return(EINVAL);2820128202/*Trytoupdatetheentry.
*/28203switch(style){28204caseSTYLE_DEV:dp->dmap_opcl=gen_opcl;break;MINIXSOURCECODEFile:servers/fs/dmap.
c88328205caseSTYLE_TTY:dp->dmap_opcl=tty_opcl;break;28206caseSTYLE_CLONE:dp->dmap_opcl=clone_opcl;break;28207default:return(EINVAL);28208}28209dp->dmap_io=gen_io;28210dp->dmap_driver=proc_nr;28211return(OK);28212}2821428215*build_dmap*2821628217PUBLICvoidbuild_dmap()28218{28219/*Initializethetablewithalldevicedrivermappings.
Then,map28220*thebootdrivertoacontrollerandupdatethedmaptabletothat28221*selection.
Thebootdriverandthecontrollerithandlesaresetat28222*thebootmonitor.
28223*/28224chardriver[16];28225char*controller="c##";28226intnr,major=-1;28227inti,s;28228structdmap*dp;2822928230/*Buildtablewithdevicedrivermappings.
*/28231for(i=0;idmap_opcl=init_dmap[i].
dmap_opcl;28236dp->dmap_io=init_dmap[i].
dmap_io;28237dp->dmap_driver=init_dmap[i].
dmap_driver;28238dp->dmap_flags=init_dmap[i].
dmap_flags;28239}else{/*nodefault*/28240dp->dmap_opcl=no_dev;28241dp->dmap_io=0;28242dp->dmap_driver=0;28243dp->dmap_flags=DMAP_MUTABLE;28244}28245}2824628247/*Getsettingsof'controller'and'driver'atthebootmonitor.
*/28248if((s=env_get_param("label",driver,sizeof(driver)))!
=OK)28249panic(__FILE__,"couldn'tgetbootmonitorparameter'driver'",s);28250if((s=env_get_param("controller",controller,sizeof(controller)))!
=OK)28251panic(__FILE__,"couldn'tgetbootmonitorparameter'controller'",s);2825228253/*Determinemajornumbertomapdriveronto.
*/28254if(controller[0]=='f'&&controller[1]=='d'){28255major=FLOPPY_MAJOR;28256}28257elseif(controller[0]=='c'&&isdigit(controller[1])){28258if((nr=(unsigned)atoi(&controller[1]))>NR_CTRLRS)28259panic(__FILE__,"monitor'controller'maximum'c#'is",NR_CTRLRS);28260major=CTRLR(nr);28261}28262else{28263panic(__FILE__,"monitor'controller'syntaxis'c#'of'fd'",NO_NUM);28264}884File:servers/fs/dmap.
cMINIXSOURCECODE2826528266/*Nowtrytosettheactualmappingandreporttotheuser.
*/28267if((s=map_driver(major,DRVR_PROC_NR,STYLE_DEV))!
=OK)28268panic(__FILE__,"map_driverfailed",s);28269printf("Bootmediumdriver:%sdrivermappedontocontroller%s.
\n",28270driver,controller);28271}servers/fs/device.
c28300/*Whenaneededblockisnotinthecache,itmustbefetchedfromthedisk.
28301*SpecialcharacterfilesalsorequireI/O.
Theroutinesforthesearehere.
28302*28303*Theentrypointsinthisfileare:28304*dev_open:FSopensadevice28305*dev_close:FSclosesadevice28306*dev_io:FSdoesareadorwriteonadevice28307*dev_status:FSprocessescallbackrequestalert28308*gen_opcl:genericcalltoatasktoperformanopen/close28309*gen_io:genericcalltoatasktoperformanI/Ooperation28310*no_dev:open/closeprocessingfordevicesthatdon'texist28311*tty_opcl:performtty-specificprocessingforopen/close28312*ctty_opcl:performcontrolling-tty-specificprocessingforopen/close28313*ctty_io:performcontrolling-tty-specificprocessingforI/O28314*do_ioctl:performtheIOCTLsystemcall28315*do_setsid:performtheSETSIDsystemcall(FSside)28316*/2831728318#include"fs.
h"28319#include28320#include28321#include28322#include"file.
h"28323#include"fproc.
h"28324#include"inode.
h"28325#include"param.
h"2832628327#defineELEMENTS(a)(sizeof(a)/sizeof((a)[0]))2832828329externintdmap_size;283302833128332*dev_open*2833328334PUBLICintdev_open(dev,proc,flags)28335dev_tdev;/*devicetoopen*/28336intproc;/*processtoopenfor*/28337intflags;/*modebitsandflags*/28338{28339intmajor,r;28340structdmap*dp;2834128342/*Determinethemajordevicenumbercallthedeviceclassspecific28343*open/closeroutine.
(Thisistheonlyroutinethatmustcheckthe28344*devicenumberforbeinginrange.
Allotherscantrustthischeck.
)MINIXSOURCECODEFile:servers/fs/device.
c88528345*/28346major=(dev>>MAJOR)&BYTE;28347if(major>=NR_DEVICES)major=0;28348dp=&dmap[major];28349r=(*dp->dmap_opcl)(DEV_OPEN,dev,proc,flags);28350if(r==SUSPEND)panic(__FILE__,"suspendonopenfrom",dp->dmap_driver);28351return(r);28352}2835428355*dev_close*2835628357PUBLICvoiddev_close(dev)28358dev_tdev;/*devicetoclose*/28359{28360(void)(*dmap[(dev>>MAJOR)&BYTE].
dmap_opcl)(DEV_CLOSE,dev,0,0);28361}2836328364*dev_status*2836528366PUBLICvoiddev_status(message*m)28367{28368messagest;28369intd,get_more=1;2837028371for(d=0;dm_source)28373break;2837428375if(d>=NR_DEVICES)28376return;2837728378do{28379intr;28380st.
m_type=DEV_STATUS;28381if((r=sendrec(m->m_source,&st))!
=OK)28382panic(__FILE__,"couldn'tsendrecforDEV_STATUS",r);2838328384switch(st.
m_type){28385caseDEV_REVIVE:28386revive(st.
REP_PROC_NR,st.
REP_STATUS);28387break;28388caseDEV_IO_READY:28389select_notified(d,st.
DEV_MINOR,st.
DEV_SEL_OPS);28390break;28391default:28392printf("FS:unrecognizedreply%dtoDEV_STATUS\n",st.
m_type);28393/*Fallthrough.
*/28394caseDEV_NO_STATUS:28395get_more=0;28396break;28397}28398}while(get_more);2839928400return;28401}886File:servers/fs/device.
cMINIXSOURCECODE2840328404*dev_io*2840528406PUBLICintdev_io(op,dev,proc,buf,pos,bytes,flags)28407intop;/*DEV_READ,DEV_WRITE,DEV_IOCTL,etc.
*/28408dev_tdev;/*major-minordevicenumber*/28409intproc;/*inwhoseaddressspaceisbuf*/28410void*buf;/*virtualaddressofthebuffer*/28411off_tpos;/*byteposition*/28412intbytes;/*howmanybytestotransfer*/28413intflags;/*specialflags,likeO_NONBLOCK*/28414{28415/*Readorwritefromadevice.
Theparameter'dev'tellswhichone.
*/28416structdmap*dp;28417messagedev_mess;2841828419/*Determinetaskdmap.
*/28420dp=&dmap[(dev>>MAJOR)&BYTE];2842128422/*Setupthemessagepassedtotask.
*/28423dev_mess.
m_type=op;28424dev_mess.
DEVICE=(dev>>MINOR)&BYTE;28425dev_mess.
POSITION=pos;28426dev_mess.
PROC_NR=proc;28427dev_mess.
ADDRESS=buf;28428dev_mess.
COUNT=bytes;28429dev_mess.
TTY_FLAGS=flags;2843028431/*Callthetask.
*/28432(*dp->dmap_io)(dp->dmap_driver,&dev_mess);2843328434/*Taskhascompleted.
Seeifcallcompleted.
*/28435if(dev_mess.
REP_STATUS==SUSPEND){28436if(flags&O_NONBLOCK){28437/*Notsupposedtoblock.
*/28438dev_mess.
m_type=CANCEL;28439dev_mess.
PROC_NR=proc;28440dev_mess.
DEVICE=(dev>>MINOR)&BYTE;28441(*dp->dmap_io)(dp->dmap_driver,&dev_mess);28442if(dev_mess.
REP_STATUS==EINTR)dev_mess.
REP_STATUS=EAGAIN;28443}else{28444/*Suspenduser.
*/28445suspend(dp->dmap_driver);28446return(SUSPEND);28447}28448}28449return(dev_mess.
REP_STATUS);28450}2845228453*gen_opcl*2845428455PUBLICintgen_opcl(op,dev,proc,flags)28456intop;/*operation,DEV_OPENorDEV_CLOSE*/28457dev_tdev;/*devicetoopenorclose*/28458intproc;/*processtoopen/closefor*/28459intflags;/*modebitsandflags*/28460{28461/*Calledfromthedmapstructintable.
conopens&closesofspecialfiles.
*/28462structdmap*dp;MINIXSOURCECODEFile:servers/fs/device.
c88728463messagedev_mess;2846428465/*Determinetaskdmap.
*/28466dp=&dmap[(dev>>MAJOR)&BYTE];2846728468dev_mess.
m_type=op;28469dev_mess.
DEVICE=(dev>>MINOR)&BYTE;28470dev_mess.
PROC_NR=proc;28471dev_mess.
COUNT=flags;2847228473/*Callthetask.
*/28474(*dp->dmap_io)(dp->dmap_driver,&dev_mess);2847528476return(dev_mess.
REP_STATUS);28477}2847928480*tty_opcl*2848128482PUBLICinttty_opcl(op,dev,proc,flags)28483intop;/*operation,DEV_OPENorDEV_CLOSE*/28484dev_tdev;/*devicetoopenorclose*/28485intproc;/*processtoopen/closefor*/28486intflags;/*modebitsandflags*/28487{28488/*Thisprocedureiscalledfromthedmapstructonttyopen/close.
*/2848928490intr;28491registerstructfproc*rfp;2849228493/*AddO_NOCTTYtotheflagsifthisprocessisnotasessionleader,or28494*ifitalreadyhasacontrollingtty,orifitissomeoneelses28495*controllingtty.
28496*/28497if(!
fp->fp_sesldr||fp->fp_tty!
=0){28498flags|=O_NOCTTY;28499}else{28500for(rfp=&fproc[0];rfpfp_tty==dev)flags|=O_NOCTTY;28502}28503}2850428505r=gen_opcl(op,dev,proc,flags);2850628507/*Didthiscallmakethettythecontrollingtty*/28508if(r==1){28509fp->fp_tty=dev;28510r=OK;28511}28512return(r);28513}2851528516*ctty_opcl*2851728518PUBLICintctty_opcl(op,dev,proc,flags)28519intop;/*operation,DEV_OPENorDEV_CLOSE*/28520dev_tdev;/*devicetoopenorclose*/28521intproc;/*processtoopen/closefor*/28522intflags;/*modebitsandflags*/888File:servers/fs/device.
cMINIXSOURCECODE28523{28524/*Thisprocedureiscalledfromthedmapstructintable.
conopening/closing28525*/dev/tty,themagicdevicethattranslatestothecontrollingtty.
28526*/2852728528return(fp->fp_tty==0ENXIO:OK);28529}2853128532*do_setsid*2853328534PUBLICintdo_setsid()28535{28536/*PerformtheFSsideoftheSETSIDcall,i.
e.
getridofthecontrolling28537*terminalofaprocess,andmaketheprocessasessionleader.
28538*/28539registerstructfproc*rfp;2854028541/*OnlyMMmaydotheSETSIDcalldirectly.
*/28542if(who!
=PM_PROC_NR)return(ENOSYS);2854328544/*Maketheprocessasessionleaderwithnocontrollingtty.
*/28545rfp=&fproc[m_in.
slot1];28546rfp->fp_sesldr=TRUE;28547rfp->fp_tty=0;28548return(OK);28549}2855128552*do_ioctl*2855328554PUBLICintdo_ioctl()28555{28556/*Performtheioctl(ls_fd,request,argx)systemcall(usesm2fmt).
*/2855728558structfilp*f;28559registerstructinode*rip;28560dev_tdev;2856128562if((f=get_filp(m_in.
ls_fd))==NIL_FILP)return(err_code);28563rip=f->filp_ino;/*getinodepointer*/28564if((rip->i_mode&I_TYPE)!
=I_CHAR_SPECIAL28565&&(rip->i_mode&I_TYPE)!
=I_BLOCK_SPECIAL)return(ENOTTY);28566dev=(dev_t)rip->i_zone[0];2856728568return(dev_io(DEV_IOCTL,dev,who,m_in.
ADDRESS,0L,28569m_in.
REQUEST,f->filp_flags));28570}2857228573*gen_io*2857428575PUBLICvoidgen_io(task_nr,mess_ptr)28576inttask_nr;/*whichtasktocall*/28577message*mess_ptr;/*pointertomessagefortask*/28578{28579/*AllfilesystemI/OultimatelycomesdowntoI/Oonmajor/minordevice28580*pairs.
Theseleadtocallsonthefollowingroutinesviathedmaptable.
28581*/28582MINIXSOURCECODEFile:servers/fs/device.
c88928583intr,proc_nr;28584messagelocal_m;2858528586proc_nr=mess_ptr->PROC_NR;28587if(!
isokprocnr(proc_nr)){28588printf("FS:warning,gotillegalprocessnumber(%d)from%d\n",28589mess_ptr->PROC_NR,mess_ptr->m_source);28590return;28591}2859228593while((r=sendrec(task_nr,mess_ptr))==ELOCKED){28594/*sendrec()failedtoavoiddeadlock.
Thetask'task_nr'is28595*tryingtosendaREVIVEmessageforanearlierrequest.
28596*Handleitandgotryagain.
28597*/28598if((r=receive(task_nr,&local_m))!
=OK){28599break;28600}2860128602/*Ifwe'retryingtosendacancelmessagetoataskwhichhasjust28603*sentacompletionreply,ignorethereplyandabortthecancel28604*request.
Thecallerwilldotherevivefortheprocess.
28605*/28606if(mess_ptr->m_type==CANCEL&&local_m.
REP_PROC_NR==proc_nr){28607return;28608}2860928610/*OtherwiseitshouldbeaREVIVE.
*/28611if(local_m.
m_type!
=REVIVE){28612printf(28613"fs:strangedevicereplyfrom%d,type=%d,proc=%d(1)\n",28614local_m.
m_source,28615local_m.
m_type,local_m.
REP_PROC_NR);28616continue;28617}2861828619revive(local_m.
REP_PROC_NR,local_m.
REP_STATUS);28620}2862128622/*Themessagereceivedmaybeareplytothiscall,oraREVIVEforsome28623*otherprocess.
28624*/28625for(;;){28626if(r!
=OK){28627if(r==EDEADDST)return;/*giveup*/28628elsepanic(__FILE__,"call_task:can'tsend/receive",r);28629}2863028631/*Didtheprocesswedidthesendrec()forgetaresult*/28632if(mess_ptr->REP_PROC_NR==proc_nr){28633break;28634}elseif(mess_ptr->m_type==REVIVE){28635/*OtherwiseitshouldbeaREVIVE.
*/28636revive(mess_ptr->REP_PROC_NR,mess_ptr->REP_STATUS);28637}else{28638printf(28639"fs:strangedevicereplyfrom%d,type=%d,proc=%d(2)\n",28640mess_ptr->m_source,28641mess_ptr->m_type,mess_ptr->REP_PROC_NR);28642return;890File:servers/fs/device.
cMINIXSOURCECODE28643}2864428645r=receive(task_nr,mess_ptr);28646}28647}2864928650*ctty_io*2865128652PUBLICvoidctty_io(task_nr,mess_ptr)28653inttask_nr;/*notused-forcompatibilitywithdmap_t*/28654message*mess_ptr;/*pointertomessagefortask*/28655{28656/*Thisroutineisonlycalledforonedevice,namely/dev/tty.
Itsjob28657*istochangethemessagetousethecontrollingterminal,insteadofthe28658*major/minorpairfor/dev/ttyitself.
28659*/2866028661structdmap*dp;2866228663if(fp->fp_tty==0){28664/*Nocontrollingttypresentanymore,returnanI/Oerror.
*/28665mess_ptr->REP_STATUS=EIO;28666}else{28667/*Substitutethecontrollingterminaldevice.
*/28668dp=&dmap[(fp->fp_tty>>MAJOR)&BYTE];28669mess_ptr->DEVICE=(fp->fp_tty>>MINOR)&BYTE;28670(*dp->dmap_io)(dp->dmap_driver,mess_ptr);28671}28672}2867428675*no_dev*2867628677PUBLICintno_dev(op,dev,proc,flags)28678intop;/*operation,DEV_OPENorDEV_CLOSE*/28679dev_tdev;/*devicetoopenorclose*/28680intproc;/*processtoopen/closefor*/28681intflags;/*modebitsandflags*/28682{28683/*Calledwhenopeninganonexistentdevice.
*/2868428685return(ENODEV);28686}2868828689*clone_opcl*2869028691PUBLICintclone_opcl(op,dev,proc,flags)28692intop;/*operation,DEV_OPENorDEV_CLOSE*/28693dev_tdev;/*devicetoopenorclose*/28694intproc;/*processtoopen/closefor*/28695intflags;/*modebitsandflags*/28696{28697/*Somedevicesneedspecialprocessinguponopen.
Suchadeviceis"cloned",28698*i.
e.
onasuccesfulopenitisreplacedbyanewdevicewithanewunique28699*minordevicenumber.
Thisnewdevicenumberidentifiesanewobject(such28700*asanewnetworkconnection)thathasbeenallocatedwithinatask.
28701*/28702structdmap*dp;MINIXSOURCECODEFile:servers/fs/device.
c89128703intminor;28704messagedev_mess;2870528706/*Determinetaskdmap.
*/28707dp=&dmap[(dev>>MAJOR)&BYTE];28708minor=(dev>>MINOR)&BYTE;2870928710dev_mess.
m_type=op;28711dev_mess.
DEVICE=minor;28712dev_mess.
PROC_NR=proc;28713dev_mess.
COUNT=flags;2871428715/*Callthetask.
*/28716(*dp->dmap_io)(dp->dmap_driver,&dev_mess);2871728718if(op==DEV_OPEN&&dev_mess.
REP_STATUS>=0){28719if(dev_mess.
REP_STATUS!
=minor){28720/*Anewminordevicenumberhasbeenreturned.
Createa28721*temporarydevicefiletoholdit.
28722*/28723structinode*ip;2872428725/*Devicenumberofthenewdevice.
*/28726dev=(dev&(BYTEi_zone[0]=dev;2873528736put_inode(fp->fp_filp[m_in.
fd]->filp_ino);28737fp->fp_filp[m_in.
fd]->filp_ino=ip;28738}28739dev_mess.
REP_STATUS=OK;28740}28741return(dev_mess.
REP_STATUS);28742}servers/fs/time.
c28800/*Thisfiletakescareofthosesystemcallsthatdealwithtime.
28801*28802*Theentrypointsintothisfileare28803*do_utime:performtheUTIMEsystemcall28804*do_stime:PMinformsFSaboutSTIMEsystemcall28805*/2880628807#include"fs.
h"28808#include28809#include892File:servers/fs/time.
cMINIXSOURCECODE28810#include"file.
h"28811#include"fproc.
h"28812#include"inode.
h"28813#include"param.
h"288142881528816*do_utime*2881728818PUBLICintdo_utime()28819{28820/*Performtheutime(name,timep)systemcall.
*/2882128822registerstructinode*rip;28823registerintlen,r;2882428825/*Adjustforcaseof'timep'beingNULL;28826*utime_strlenthenholdstheactualsize:strlen(name)+1.
28827*/28828len=m_in.
utime_length;28829if(len==0)len=m_in.
utime_strlen;2883028831/*Temporarilyopenthefile.
*/28832if(fetch_name(m_in.
utime_file,len,M1)!
=OK)return(err_code);28833if((rip=eat_path(user_path))==NIL_INODE)return(err_code);2883428835/*Onlytheownerofafileorthesuper_usercanchangeitstime.
*/28836r=OK;28837if(rip->i_uid!
=fp->fp_effuid&&!
super_user)r=EPERM;28838if(m_in.
utime_length==0&&r!
=OK)r=forbidden(rip,W_BIT);28839if(read_only(rip)!
=OK)r=EROFS;/*notevensucantouchifR/O*/28840if(r==OK){28841if(m_in.
utime_length==0){28842rip->i_atime=clock_time();28843rip->i_mtime=rip->i_atime;28844}else{28845rip->i_atime=m_in.
utime_actime;28846rip->i_mtime=m_in.
utime_modtime;28847}28848rip->i_update=CTIME;/*discardanystaleATIMEandMTIMEflags*/28849rip->i_dirt=DIRTY;28850}2885128852put_inode(rip);28853return(r);28854}2885628857*do_stime*2885828859PUBLICintdo_stime()28860{28861/*Performthestime(tp)systemcall.
*/28862boottime=(long)m_in.
pm_stime;28863return(OK);28864}