1994/1210/pc/main.c (diff list | history)

pc/main.c on 1991/0702
1991/0702		#include "u.h"
1992/0321		#include "../port/lib.h"
1991/0706		#include "mem.h"
1991/0702		#include "dat.h" #include "fns.h"
1991/0706		#include "io.h"
1991/0716		#include "ureg.h" #include "init.h"
1992/0918		#include <ctype.h>
1991/0629
1992/0904
1992/0903		uchar *sp; /* stack pointer for /boot */
1992/0923		extern PCArch nsx20, generic, ncr3170; PCArch *arch; PCArch *knownarch[] = { &nsx20, &ncr3170, &generic, };
1993/0330		/* where b.com leaves configuration info */ #define BOOTARGS ((char*)(KZERO|1024)) #define BOOTARGSLEN 1024 #define MAXCONF 32
1993/0915		char bootdisk[NAMELEN];
1994/0607		char filaddr[NAMELEN];
1993/0330		char *confname[MAXCONF]; char *confval[MAXCONF]; int nconf;
1993/0915		/* memory map */ #define MAXMEG 64 char mmap[MAXMEG+2];
1991/0716		void
1991/0702		main(void)
1991/0625		{
1991/1210		ident();
1992/0902		i8042a20(); /* enable address lines 20 and up */
1991/0711		machinit();
1991/1113		active.exiting = 0; active.machs = 1;
1991/0711		confinit();
1992/0625		xinit();
1993/0915		dmainit();
1991/0703		screeninit();
1991/0716		printinit();
1991/0711		mmuinit();
1994/1007		ns16552install();
1992/0625		pageinit();
1991/0718		trapinit();
1991/0906		mathinit();
1991/0718		clockinit(); faultinit();
1992/0409		kbdinit();
1991/0716		procinit0(); initseg();
1993/0915		links();
1994/0302		printcpufreq();
1991/0716		chandevreset(); swapinit(); userinit(); schedinit();
1991/0712		}
1991/0706
1992/0902		/*
1992/0903		* This tries to capture architecture dependencies since things
1994/0525		* like power management/reseting/mouse are outside the hardware
1992/0903		* model.
1992/0902		*/
1991/0716		void
1991/1210		ident(void) { char *id = (char*)(ROMBIOS + 0xFF40);
1992/0923		PCArch **p;
1991/1210
1992/0923		for(p = knownarch; *p != &generic; p++) if(strncmp((*p)->id, id, strlen((*p)->id)) == 0)
1992/0918		break;
1992/0923		arch = *p;
1991/1210		} void
1991/0716		machinit(void)
1991/0712		{
1991/0716		int n;
1991/0712
1991/0716		n = m->machno; memset(m, 0, sizeof(Mach)); m->machno = n; m->mmask = 1<<m->machno;
1991/0625		}
1991/0716		void
1993/1013		ksetterm(char *f) { char buf[2*NAMELEN]; sprint(buf, f, conffile); ksetenv("terminal", buf); } void
1991/0716		init0(void)
1991/0712		{
1993/0330		int i;
1992/0918		char tstr[32];
1993/0915		up->nerrlab = 0;
1991/0712
1991/0720		spllo();
1991/0716		/* * These are o.k. because rootinit is null. * Then early kproc's will have a root and dot. */
1993/0915		up->slash = namec("#/", Atodir, 0, 0); up->dot = clone(up->slash, 0);
1991/0712
1991/0716		chandevinit();
1991/0926		if(!waserror()){
1992/0923		strcpy(tstr, arch->id);
1992/0918		strcat(tstr, " %s"); ksetterm(tstr);
1991/0927		ksetenv("cputype", "386");
1993/0915		for(i = 0; i < nconf; i++) if(confname[i]) ksetenv(confname[i], confval[i]);
1991/0926		poperror(); }
1993/0915		kproc("alarm", alarmkproc, 0);
1992/0323		touser(sp);
1991/0712		}
1991/0629		void
1991/0716		userinit(void)
1991/0711		{
1991/0716		Proc *p; Segment *s; KMap *k;
1992/0323		Page *pg;
1991/0905
1991/0716		p = newproc(); p->pgrp = newpgrp();
1992/0625		p->egrp = smalloc(sizeof(Egrp)); p->egrp->ref = 1; p->fgrp = smalloc(sizeof(Fgrp)); p->fgrp->ref = 1;
1994/0812		p->rgrp = newrgrp();
1991/1112		p->procmode = 0640;
1991/0716		strcpy(p->text, "*init*");
1991/1109		strcpy(p->user, eve);
1991/0716		p->fpstate = FPinit;
1991/0906		fpoff();
1991/0716		/* * Kernel Stack
1991/0717		*
1991/0719		* N.B. The -12 for the stack pointer is important. * 4 bytes for gotolabel's return PC
1991/0716		*/ p->sched.pc = (ulong)init0;
1993/0915		p->sched.sp = (ulong)p->kstack+KSTACK-(1+MAXSYSARG)*BY2WD;
1991/0716		/* * User Stack */
1993/0915		s = newseg(SG_STACK, USTKTOP-USTKSIZE, USTKSIZE/BY2PG);
1991/0716		p->seg[SSEG] = s;
1992/0323		pg = newpage(1, 0, USTKTOP-BY2PG); segpage(s, pg); k = kmap(pg); bootargs(VA(k)); kunmap(k);
1991/0716		/* * Text */ s = newseg(SG_TEXT, UTZERO, 1);
1993/0915		s->flushme++;
1991/0716		p->seg[TSEG] = s;
1993/0915		pg = newpage(1, 0, UTZERO); memset(pg->cachectl, PG_TXTFLUSH, sizeof(pg->cachectl)); segpage(s, pg);
1991/0716		k = kmap(s->map[0]->pages[0]); memmove((ulong*)VA(k), initcode, sizeof initcode); kunmap(k); ready(p);
1992/0323		} uchar * pusharg(char *p) { int n; n = strlen(p)+1; sp -= n; memmove(sp, p, n); return sp; } void bootargs(ulong base) { int i, ac; uchar *av[32]; uchar **lsp;
1992/0903		char *cp = BOOTLINE; char buf[64];
1992/0323		sp = (uchar*)base + BY2PG - MAXSYSARG*BY2WD; ac = 0;
1994/0219		av[ac++] = pusharg("/386/9dos");
1992/0323		av[ac++] = pusharg("-p");
1992/0903		cp[64] = 0;
1993/0915		buf[0] = 0;
1992/0903		if(strncmp(cp, "fd!", 3) == 0){ sprint(buf, "local!#f/fd%ddisk", atoi(cp+3)); av[ac++] = pusharg(buf);
1993/0915		} else if(strncmp(cp, "h!", 2) == 0){ sprint(buf, "local!#H/hd%dfs", atoi(cp+2)); av[ac++] = pusharg(buf);
1992/0903		} else if(strncmp(cp, "hd!", 3) == 0){
1993/0915		sprint(buf, "local!#H/hd%ddisk", atoi(cp+3));
1992/0903		av[ac++] = pusharg(buf);
1993/0915		} else if(strncmp(cp, "s!", 2) == 0){ sprint(buf, "local!#w/sd%dfs", atoi(cp+2)); av[ac++] = pusharg(buf); } else if(strncmp(cp, "sd!", 3) == 0){ sprint(buf, "local!#w/sd%ddisk", atoi(cp+3)); av[ac++] = pusharg(buf);
1994/1111		} else if(strncmp(cp, "e!", 2) == 0) av[ac++] = pusharg("-n");
1993/0915		if(buf[0]){ cp = strchr(buf, '!'); if(cp){ strcpy(bootdisk, cp+1); addconf("bootdisk", bootdisk); } }
1992/0323		/* 4 byte word align stack */ sp = (uchar*)((ulong)sp & ~3); /* build argc, argv on stack */ sp -= (ac+1)*sizeof(sp); lsp = (uchar**)sp; for(i = 0; i < ac; i++) *lsp++ = av[i] + ((USTKTOP - BY2PG) - base); *lsp = 0; sp += (USTKTOP - BY2PG) - base - sizeof(ulong);
1991/0711		}
1991/0716		Conf conf;
1991/0711		void
1993/0915		addconf(char *name, char *val) { if(nconf >= MAXCONF) return; confname[nconf] = name; confval[nconf] = val; nconf++; } char* getconf(char *name) { int i; for(i = 0; i < nconf; i++) if(strcmp(confname[i], name) == 0) return confval[i]; return 0; }
1994/0814		/* * zero memory to set ECC. * do a quick memory test also. *
1994/0815		* if any part of a meg is missing/broken, return -1.
1994/0814		*/ int memclrtest(int meg, int len, long seed) { int j, n; long y; long *lp; for(j = 0; j < len; j += BY2PG){ lp = mapaddr(KZERO|(meg*MB+j)); for(n = 0; n < BY2PG/BY2WD; n++) lp[n] = seed + n; } for(j = 0; j < len; j += BY2PG){ lp = mapaddr(KZERO|(meg*MB+j)); for(n = 0; n < BY2PG/(2*BY2WD); n++){ y = lp[n]; lp[n] = ~lp[n^((BY2PG/BY2WD)-1)]; lp[n^((BY2PG/BY2WD)-1)] = ~y; } } for(j = 0; j < len; j += BY2PG){ lp = mapaddr(KZERO|(meg*MB+j)); for(n = 0; n < BY2PG/BY2WD; n++) if(lp[n] != ~(seed + (n^((BY2PG/BY2WD)-1)))) return -1;
1994/1210		/* memset(lp, '!', BY2PG);/**/
1994/0814		} return 0; }
1994/1210		/* * look for unused address space in 0xC8000 to 1 meg */
1993/0915		void
1994/1210		romscan(void) { uchar *p; p = (uchar*)(KZERO+0xC8000); while(p < (uchar*)(KZERO+0xE0000)){ p[0] = 0x55; p[1] = 0xAA; p[2] = 4; if(p[0] != 0x55 || p[1] != 0xAA){ putisa(PADDR(p), 2048); p += 2048; continue; } p += p[2]*512; } p = (uchar*)(KZERO+0xE0000); if(p[0] != 0x55 || p[1] != 0xAA) putisa(PADDR(p), 64*1024); } void
1991/0711		confinit(void) {
1994/0814		long x, i, j, n;
1992/1002		int pcnt;
1992/0715		ulong ktop;
1993/0330		char *cp; char *line[MAXCONF];
1994/0513		extern int defmaxmsg;
1991/0711
1993/0416		pcnt = 0;
1991/0711		/*
1993/1113		* parse configuration args from dos file plan9.ini
1993/0416		*/
1993/0915		cp = BOOTARGS; /* where b.com leaves its config */
1993/0416		cp[BOOTARGSLEN-1] = 0; n = getfields(cp, line, MAXCONF, '\n'); for(j = 0; j < n; j++){ cp = strchr(line[j], '\r'); if(cp) *cp = 0; cp = strchr(line[j], '='); if(cp == 0) continue; *cp++ = 0; if(cp - line[j] >= NAMELEN+1) *(line[j]+NAMELEN-1) = 0; confname[nconf] = line[j]; confval[nconf] = cp; if(strcmp(confname[nconf], "kernelpercent") == 0) pcnt = 100 - atoi(confval[nconf]);
1994/0513		if(strcmp(confname[nconf], "defmaxmsg") == 0){ i = atoi(confval[nconf]); if(i < defmaxmsg && i >=128) defmaxmsg = i; }
1994/0607		if(strcmp(confname[nconf], "filaddr") == 0) strcpy(filaddr, confval[nconf]);
1993/0416		nconf++; }
1994/0814
1994/1210
1993/0416		/*
1993/0915		* size memory above 1 meg. Kernel sits at 1 meg. We * only recognize MB size chunks.
1991/0711		*/
1993/0915		memset(mmap, ' ', sizeof(mmap));
1991/0711		x = 0x12345678;
1993/0915		for(i = 1; i <= MAXMEG; i++){
1991/0711		/*
1993/0915		* write the first & last word in a megabyte of memory
1991/0711		*/
1993/0915		*mapaddr(KZERO|(i*MB)) = x; *mapaddr(KZERO|((i+1)*MB-BY2WD)) = x;
1991/0711		/*
1993/0915		* write the first and last word in all previous megs to * handle address wrap around
1991/0711		*/
1992/1019		for(j = 1; j < i; j++){
1993/0915		*mapaddr(KZERO|(j*MB)) = ~x; *mapaddr(KZERO|((j+1)*MB-BY2WD)) = ~x;
1991/0711		}
1993/0915
1991/0711		/*
1993/0915		* check for correct value
1991/0711		*/
1994/0815		if(*mapaddr(KZERO|(i*MB)) == x) if(*mapaddr(KZERO|((i+1)*MB-BY2WD)) == x) mmap[i] = 'x';
1994/0814		x += 0x3141526; } /*
1994/0817		* zero and clear all except first 2 meg.
1994/0814		*/ x = 0x12345678; for(i = MAXMEG; i > 1; i--){ if(mmap[i] != 'x') continue;
1994/0817		if(memclrtest(i, MB, x) < 0)
1994/0814		mmap[i] = ' ';
1991/0711		x += 0x3141526; }
1994/0814
1993/0915		/* * bank0 usually goes from the end of kernel bss to the end of memory */ ktop = PGROUND((ulong)end); ktop = PADDR(ktop); conf.base0 = ktop; for(i = 1; mmap[i] == 'x'; i++) ;
1994/0814		conf.npage0 = (i*MB - ktop)/BY2PG;
1993/0915		conf.topofmem = i*MB; /*
1994/0814		* bank1 usually goes from the end of BOOTARGS to 640k
1993/0915		*/
1994/0813		conf.base1 = (ulong)(BOOTARGS + BOOTARGSLEN);
1993/0915		conf.base1 = PGROUND(conf.base1); conf.base1 = PADDR(conf.base1);
1994/0813		conf.npage1 = (640*1024 - conf.base1)/BY2PG;
1993/0915		/*
1994/0814		* if there is a hole in memory (e.g. due to a shadow BIOS) make the
1993/0915		* memory after the hole be bank 1. The memory from 0 to 640k * is lost. */ for(; i <= MAXMEG; i++) if(mmap[i] == 'x'){ conf.base1 = i*MB; for(j = i+1; mmap[j] == 'x'; j++) ; conf.npage1 = (j - i)*MB/BY2PG; conf.topofmem = j*MB; break; }
1994/1210		/* * add address space holes holes under 16 meg to available * isa space. */ romscan(); if(conf.topofmem < 16*MB) putisa(conf.topofmem, 16*MB - conf.topofmem);
1993/0915
1991/0711		conf.npage = conf.npage0 + conf.npage1;
1992/1113		conf.ldepth = 0;
1993/0416		if(pcnt < 10) pcnt = 70;
1992/1014		conf.upages = (conf.npage*pcnt)/100;
1994/0322		conf.ialloc = ((conf.npage-conf.upages)/2)*BY2PG;
1992/1016
1994/0923		conf.nproc = 100 + ((conf.npage*BY2PG)/MB)*5;
1993/0401		conf.monitor = 1; conf.nswap = conf.nproc*80; conf.nimage = 50;
1994/0302		switch(x86()){
1994/1031		case 3:
1994/0302		conf.copymode = 1; /* copy on reference */ break; default: conf.copymode = 0; /* copy on write */ break; }
1993/0401		conf.nfloppy = 2; conf.nhard = 2;
1993/0413		conf.nmach = 1;
1991/0711		}
1991/0913		char *mathmsg[] =
1991/0906		{
1991/0913		"invalid", "denormalized", "div-by-zero", "overflow", "underflow", "precision", "stack", "error", };
1991/0906		/*
1991/0912		* math coprocessor error */ void
1993/1124		matherror(Ureg *ur, void *arg)
1991/0912		{
1991/0913		ulong status; int i; char *msg; char note[ERRLEN];
1993/1124		USED(arg);
1991/0913		/* * a write cycle to port 0xF0 clears the interrupt latch attached * to the error# line from the 387 */ outb(0xF0, 0xFF);
1992/0806		/* * save floating point state to check out error */
1993/0915		fpenv(&up->fpsave); status = up->fpsave.status;
1992/0806		msg = 0;
1991/0913		for(i = 0; i < 8; i++) if((1<<i) & status){ msg = mathmsg[i];
1993/0915		sprint(note, "sys: fp: %s fppc=0x%lux", msg, up->fpsave.pc);
1993/1013		postnote(up, 1, note, NDebug);
1991/0913		break; }
1992/0806		if(msg == 0){
1993/0915		sprint(note, "sys: fp: unknown fppc=0x%lux", up->fpsave.pc);
1993/1013		postnote(up, 1, note, NDebug);
1992/0806		} if(ur->pc & KZERO) panic("fp: status %lux fppc=0x%lux pc=0x%lux", status,
1993/0915		up->fpsave.pc, ur->pc);
1991/0912		} /*
1991/0906		* math coprocessor emulation fault */ void
1993/1124		mathemu(Ureg *ur, void *arg)
1991/0906		{
1993/1124		USED(ur, arg);
1993/0915		switch(up->fpstate){
1991/0906		case FPinit: fpinit();
1993/0915		up->fpstate = FPactive;
1991/0906		break; case FPinactive:
1993/0915		fprestore(&up->fpsave); up->fpstate = FPactive;
1991/0906		break; case FPactive:
1992/0805		panic("math emu", 0);
1991/0906		break; } } /* * math coprocessor segment overrun */ void
1993/1124		mathover(Ureg *ur, void *arg)
1991/0906		{
1993/1124		USED(ur, arg);
1993/0915		print("sys: fp: math overrun pc 0x%lux pid %d\n", ur->pc, up->pid);
1992/0805		pexit("math overrun", 0);
1991/0906		} void mathinit(void) {
1993/1124		setvec(Matherr1vec, matherror, 0); setvec(Matherr2vec, matherror, 0); setvec(Mathemuvec, mathemu, 0); setvec(Mathovervec, mathover, 0);
1991/0906		} /*
1991/0716		* set up floating point for a new process */
1991/0703		void
1991/0716		procsetup(Proc *p)
1991/0703		{
1991/0716		p->fpstate = FPinit;
1991/0906		fpoff();
1991/0705		}
1991/0712		/*
1991/0906		* Save the mach dependent part of the process state.
1991/0712		*/
1991/0705		void
1992/0122		procsave(Proc *p)
1991/0705		{
1992/0805		if(p->fpstate == FPactive){ if(p->state == Moribund) fpoff(); else
1993/0915		fpsave(&up->fpsave);
1992/0805		p->fpstate = FPinactive;
1991/0906		}
1991/0712		} /*
1991/0716		* Restore what procsave() saves
1991/0712		*/
1991/0716		void
1992/0122		procrestore(Proc *p)
1991/0712		{
1992/0711		USED(p);
1991/0712		}
1991/0906		/*
1991/1210		* the following functions all are slightly different from * PC to PC.
1991/0803		*/ void
1992/0812		exit(int ispanic)
1991/0803		{
1993/1013		up = 0;
1991/0803		print("exiting\n");
1993/0915		if(ispanic){
1993/1113		if(cpuserver)
1993/0915		delay(10000); else for(;;); }
1992/0903
1992/0923		(*arch->reset)();
1991/0803		} /*
1991/1210		* set cpu speed * 0 == low speed * 1 == high speed
1991/0803		*/
1991/1210		int cpuspeed(int speed)
1991/0803		{
1992/0923		if(arch->cpuspeed) return (*arch->cpuspeed)(speed); else
1991/1210		return 0;
1991/0803		} /*
1991/1210		* f == frequency (Hz) * d == duration (ms)
1991/0803		*/
1991/1210		void buzz(int f, int d)
1991/0803		{
1992/0923		if(arch->buzz) (*arch->buzz)(f, d);
1991/0803		} /*
1991/1210		* each bit in val stands for a light
1991/0803		*/
1991/1210		void lights(int val)
1991/0803		{
1992/0923		if(arch->lights) (*arch->lights)(val);
1991/0803		} /*
1991/0913		* power to serial port
1991/1210		* onoff == 1 means on * onoff == 0 means off
1991/0803		*/ int serial(int onoff) {
1992/0923		if(arch->serialpower) return (*arch->serialpower)(onoff); else
1991/1210		return 0;
1991/0803		}
1991/1001		/* * power to modem
1991/1210		* onoff == 1 means on * onoff == 0 means off
1991/1001		*/ int modem(int onoff) {
1992/0923		if(arch->modempower) return (*arch->modempower)(onoff); else
1991/1210		return 0;
1993/0915		} static int parseether(uchar *to, char *from) { char nip[4]; char *p; int i; p = from; for(i = 0; i < 6; i++){ if(*p == 0) return -1; nip[0] = *p++; if(*p == 0) return -1; nip[1] = *p++; nip[2] = 0; to[i] = strtoul(nip, 0, 16); if(*p == ':') p++; } return 0; } int isaconfig(char *class, int ctlrno, ISAConf *isa) { char cc[NAMELEN], *p, *q; int n; sprint(cc, "%s%d", class, ctlrno); for(n = 0; n < nconf; n++){ if(strncmp(confname[n], cc, NAMELEN)) continue; p = confval[n]; while(*p){ while(*p == ' ' || *p == '\t') p++; if(*p == '\0') break; if(strncmp(p, "type=", 5) == 0){ p += 5; for(q = isa->type; q < &isa->type[NAMELEN-1]; q++){ if(*p == '\0' || *p == ' ' || *p == '\t') break; *q = *p++; } *q = '\0'; } else if(strncmp(p, "port=", 5) == 0) isa->port = strtoul(p+5, &p, 0); else if(strncmp(p, "irq=", 4) == 0) isa->irq = strtoul(p+4, &p, 0); else if(strncmp(p, "mem=", 4) == 0) isa->mem = strtoul(p+4, &p, 0); else if(strncmp(p, "size=", 5) == 0) isa->size = strtoul(p+5, &p, 0);
1994/0823		else if(strncmp(p, "freq=", 5) == 0) isa->freq = strtoul(p+5, &p, 0);
1993/0915		else if(strncmp(p, "ea=", 3) == 0) parseether(isa->ea, p+3); while(*p && *p != ' ' && *p != '\t') p++; } return 1; } return 0;
1991/0803		}