843 lines
16 KiB
C
Executable file
843 lines
16 KiB
C
Executable file
#include "u.h"
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#include "../port/lib.h"
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#include "mem.h"
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#include "dat.h"
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#include "fns.h"
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#include "io.h"
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#include "ureg.h"
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#include "init.h"
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#include "pool.h"
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#include "reboot.h"
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Mach *m;
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/*
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* Where configuration info is left for the loaded programme.
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* This will turn into a structure as more is done by the boot loader
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* (e.g. why parse the .ini file twice?).
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* There are 3584 bytes available at CONFADDR.
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*/
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#define BOOTLINE ((char*)CONFADDR)
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#define BOOTLINELEN 64
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#define BOOTARGS ((char*)(CONFADDR+BOOTLINELEN))
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#define BOOTARGSLEN (4096-0x200-BOOTLINELEN)
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#define MAXCONF 64
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char bootdisk[KNAMELEN];
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Conf conf;
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char *confname[MAXCONF];
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char *confval[MAXCONF];
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int nconf;
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uchar *sp; /* user stack of init proc */
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int delaylink;
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static void
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options(void)
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{
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long i, n;
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char *cp, *line[MAXCONF], *p, *q;
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/*
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* parse configuration args from dos file plan9.ini
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*/
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cp = BOOTARGS; /* where b.com leaves its config */
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cp[BOOTARGSLEN-1] = 0;
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/*
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* Strip out '\r', change '\t' -> ' '.
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*/
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p = cp;
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for(q = cp; *q; q++){
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if(*q == '\r')
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continue;
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if(*q == '\t')
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*q = ' ';
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*p++ = *q;
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}
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*p = 0;
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n = getfields(cp, line, MAXCONF, 1, "\n");
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for(i = 0; i < n; i++){
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if(*line[i] == '#')
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continue;
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cp = strchr(line[i], '=');
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if(cp == nil)
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continue;
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*cp++ = '\0';
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confname[nconf] = line[i];
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confval[nconf] = cp;
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nconf++;
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}
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}
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extern void mmuinit0(void);
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extern void (*i8237alloc)(void);
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void
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main(void)
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{
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mach0init();
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options();
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ioinit();
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i8250console();
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quotefmtinstall();
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screeninit();
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print("\nPlan 9\n");
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trapinit0();
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mmuinit0();
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kbdinit();
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i8253init();
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cpuidentify();
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meminit();
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confinit();
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archinit();
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xinit();
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if(i8237alloc != nil)
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i8237alloc();
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trapinit();
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printinit();
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cpuidprint();
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mmuinit();
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if(arch->intrinit) /* launches other processors on an mp */
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arch->intrinit();
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timersinit();
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mathinit();
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kbdenable();
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if(arch->clockenable)
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arch->clockenable();
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procinit0();
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initseg();
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if(delaylink){
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bootlinks();
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pcimatch(0, 0, 0);
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}else
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links();
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conf.monitor = 1;
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chandevreset();
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pageinit();
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i8253link();
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swapinit();
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userinit();
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active.thunderbirdsarego = 1;
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schedinit();
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}
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void
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mach0init(void)
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{
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conf.nmach = 1;
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MACHP(0) = (Mach*)CPU0MACH;
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m->pdb = (ulong*)CPU0PDB;
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m->gdt = (Segdesc*)CPU0GDT;
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machinit();
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active.machs = 1;
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active.exiting = 0;
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}
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void
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machinit(void)
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{
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int machno;
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ulong *pdb;
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Segdesc *gdt;
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machno = m->machno;
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pdb = m->pdb;
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gdt = m->gdt;
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memset(m, 0, sizeof(Mach));
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m->machno = machno;
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m->pdb = pdb;
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m->gdt = gdt;
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m->perf.period = 1;
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/*
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* For polled uart output at boot, need
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* a default delay constant. 100000 should
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* be enough for a while. Cpuidentify will
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* calculate the real value later.
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*/
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m->loopconst = 100000;
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}
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void
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init0(void)
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{
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int i;
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char buf[2*KNAMELEN];
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up->nerrlab = 0;
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spllo();
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/*
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* These are o.k. because rootinit is null.
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* Then early kproc's will have a root and dot.
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*/
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up->slash = namec("#/", Atodir, 0, 0);
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pathclose(up->slash->path);
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up->slash->path = newpath("/");
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up->dot = cclone(up->slash);
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chandevinit();
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if(!waserror()){
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snprint(buf, sizeof(buf), "%s %s", arch->id, conffile);
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ksetenv("terminal", buf, 0);
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ksetenv("cputype", "386", 0);
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if(cpuserver)
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ksetenv("service", "cpu", 0);
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else
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ksetenv("service", "terminal", 0);
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for(i = 0; i < nconf; i++){
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if(confname[i][0] != '*')
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ksetenv(confname[i], confval[i], 0);
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ksetenv(confname[i], confval[i], 1);
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}
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poperror();
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}
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kproc("alarm", alarmkproc, 0);
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touser(sp);
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}
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void
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userinit(void)
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{
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void *v;
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Proc *p;
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Segment *s;
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Page *pg;
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p = newproc();
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p->pgrp = newpgrp();
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p->egrp = smalloc(sizeof(Egrp));
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p->egrp->ref = 1;
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p->fgrp = dupfgrp(nil);
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p->rgrp = newrgrp();
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p->procmode = 0640;
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kstrdup(&eve, "");
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kstrdup(&p->text, "*init*");
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kstrdup(&p->user, eve);
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p->fpstate = FPinit;
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fpoff();
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/*
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* Kernel Stack
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*
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* N.B. make sure there's enough space for syscall to check
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* for valid args and
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* 4 bytes for gotolabel's return PC
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*/
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p->sched.pc = (ulong)init0;
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p->sched.sp = (ulong)p->kstack+KSTACK-(sizeof(Sargs)+BY2WD);
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/*
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* User Stack
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*
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* N.B. cannot call newpage() with clear=1, because pc kmap
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* requires up != nil. use tmpmap instead.
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*/
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s = newseg(SG_STACK, USTKTOP-USTKSIZE, USTKSIZE/BY2PG);
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p->seg[SSEG] = s;
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pg = newpage(0, 0, USTKTOP-BY2PG);
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v = tmpmap(pg);
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memset(v, 0, BY2PG);
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segpage(s, pg);
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bootargs(v);
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tmpunmap(v);
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/*
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* Text
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*/
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s = newseg(SG_TEXT, UTZERO, 1);
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s->flushme++;
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p->seg[TSEG] = s;
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pg = newpage(0, 0, UTZERO);
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memset(pg->cachectl, PG_TXTFLUSH, sizeof(pg->cachectl));
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segpage(s, pg);
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v = tmpmap(pg);
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memset(v, 0, BY2PG);
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memmove(v, initcode, sizeof initcode);
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tmpunmap(v);
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ready(p);
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}
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uchar *
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pusharg(char *p)
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{
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int n;
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n = strlen(p)+1;
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sp -= n;
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memmove(sp, p, n);
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return sp;
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}
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void
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bootargs(void *base)
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{
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int i, ac;
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uchar *av[32];
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uchar **lsp;
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char *cp = BOOTLINE;
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char buf[64];
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sp = (uchar*)base + BY2PG - MAXSYSARG*BY2WD;
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ac = 0;
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av[ac++] = pusharg("/386/9dos");
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/* when boot is changed to only use rc, this code can go away */
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cp[BOOTLINELEN-1] = 0;
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buf[0] = 0;
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if(strncmp(cp, "fd", 2) == 0){
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sprint(buf, "local!#f/fd%lddisk", strtol(cp+2, 0, 0));
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av[ac++] = pusharg(buf);
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} else if(strncmp(cp, "sd", 2) == 0){
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sprint(buf, "local!#S/sd%c%c/fs", *(cp+2), *(cp+3));
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av[ac++] = pusharg(buf);
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} else if(strncmp(cp, "ether", 5) == 0)
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av[ac++] = pusharg("-n");
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/* 4 byte word align stack */
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sp = (uchar*)((ulong)sp & ~3);
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/* build argc, argv on stack */
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sp -= (ac+1)*sizeof(sp);
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lsp = (uchar**)sp;
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for(i = 0; i < ac; i++)
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*lsp++ = av[i] + ((USTKTOP - BY2PG) - (ulong)base);
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*lsp = 0;
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sp += (USTKTOP - BY2PG) - (ulong)base - sizeof(ulong);
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}
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char*
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getconf(char *name)
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{
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int i;
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for(i = 0; i < nconf; i++)
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if(cistrcmp(confname[i], name) == 0)
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return confval[i];
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return 0;
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}
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static void
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writeconf(void)
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{
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char *p, *q;
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int n;
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p = getconfenv();
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if(waserror()) {
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free(p);
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nexterror();
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}
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/* convert to name=value\n format */
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for(q=p; *q; q++) {
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q += strlen(q);
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*q = '=';
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q += strlen(q);
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*q = '\n';
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}
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n = q - p + 1;
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if(n >= BOOTARGSLEN)
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error("kernel configuration too large");
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memset(BOOTLINE, 0, BOOTLINELEN);
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memmove(BOOTARGS, p, n);
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poperror();
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free(p);
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}
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void
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confinit(void)
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{
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char *p;
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int i, userpcnt;
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ulong kpages;
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if(p = getconf("*kernelpercent"))
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userpcnt = 100 - strtol(p, 0, 0);
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else
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userpcnt = 0;
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conf.npage = 0;
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for(i=0; i<nelem(conf.mem); i++)
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conf.npage += conf.mem[i].npage;
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conf.nproc = 100 + ((conf.npage*BY2PG)/MB)*5;
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if(cpuserver)
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conf.nproc *= 3;
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if(conf.nproc > 2000)
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conf.nproc = 2000;
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conf.nimage = 200;
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conf.nswap = conf.nproc*80;
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conf.nswppo = 4096;
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if(cpuserver) {
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if(userpcnt < 10)
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userpcnt = 70;
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kpages = conf.npage - (conf.npage*userpcnt)/100;
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/*
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* Hack for the big boys. Only good while physmem < 4GB.
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* Give the kernel fixed max + enough to allocate the
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* page pool.
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* This is an overestimate as conf.upages < conf.npages.
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* The patch of nimage is a band-aid, scanning the whole
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* page list in imagereclaim just takes too long.
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*/
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if(kpages > (64*MB + conf.npage*sizeof(Page))/BY2PG){
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kpages = (64*MB + conf.npage*sizeof(Page))/BY2PG;
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conf.nimage = 2000;
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kpages += (conf.nproc*KSTACK)/BY2PG;
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}
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} else {
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if(userpcnt < 10) {
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if(conf.npage*BY2PG < 16*MB)
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userpcnt = 40;
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else
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userpcnt = 60;
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}
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kpages = conf.npage - (conf.npage*userpcnt)/100;
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/*
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* Make sure terminals with low memory get at least
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* 4MB on the first Image chunk allocation.
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*/
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if(conf.npage*BY2PG < 16*MB)
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imagmem->minarena = 4*1024*1024;
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}
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/*
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* can't go past the end of virtual memory
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* (ulong)-KZERO is 2^32 - KZERO
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*/
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if(kpages > ((ulong)-KZERO)/BY2PG)
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kpages = ((ulong)-KZERO)/BY2PG;
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conf.upages = conf.npage - kpages;
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conf.ialloc = (kpages/2)*BY2PG;
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/*
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* Guess how much is taken by the large permanent
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* datastructures. Mntcache and Mntrpc are not accounted for
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* (probably ~300KB).
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*/
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kpages *= BY2PG;
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kpages -= conf.upages*sizeof(Page)
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+ conf.nproc*sizeof(Proc)
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+ conf.nimage*sizeof(Image)
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+ conf.nswap
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+ conf.nswppo*sizeof(Page);
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mainmem->maxsize = kpages;
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if(!cpuserver){
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/*
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* give terminals lots of image memory, too; the dynamic
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* allocation will balance the load properly, hopefully.
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* be careful with 32-bit overflow.
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*/
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imagmem->maxsize = kpages;
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}
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}
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static char* mathmsg[] =
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{
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nil, /* handled below */
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"denormalized operand",
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"division by zero",
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"numeric overflow",
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"numeric underflow",
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"precision loss",
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};
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static void
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mathnote(void)
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{
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int i;
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ulong status;
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char *msg, note[ERRMAX];
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status = up->fpsave.status;
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/*
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* Some attention should probably be paid here to the
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* exception masks and error summary.
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*/
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msg = "unknown exception";
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for(i = 1; i <= 5; i++){
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if(!((1<<i) & status))
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continue;
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msg = mathmsg[i];
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break;
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}
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if(status & 0x01){
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if(status & 0x40){
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if(status & 0x200)
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msg = "stack overflow";
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else
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msg = "stack underflow";
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}else
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msg = "invalid operation";
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}
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snprint(note, sizeof note, "sys: fp: %s fppc=0x%lux status=0x%lux",
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msg, up->fpsave.pc, status);
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postnote(up, 1, note, NDebug);
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}
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/*
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* math coprocessor error
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*/
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static void
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matherror(Ureg *ur, void*)
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{
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/*
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* a write cycle to port 0xF0 clears the interrupt latch attached
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* to the error# line from the 387
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*/
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if(!(m->cpuiddx & 0x01))
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outb(0xF0, 0xFF);
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/*
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* save floating point state to check out error
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*/
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fpenv(&up->fpsave);
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mathnote();
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if((ur->pc & 0xf0000000) == KZERO)
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panic("fp: status %ux fppc=0x%lux pc=0x%lux",
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up->fpsave.status, up->fpsave.pc, ur->pc);
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}
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/*
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* math coprocessor emulation fault
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*/
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static void
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mathemu(Ureg *ureg, void*)
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{
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if(up->fpstate & FPillegal){
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/* someone did floating point in a note handler */
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postnote(up, 1, "sys: floating point in note handler", NDebug);
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return;
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}
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switch(up->fpstate){
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case FPinit:
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fpinit();
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up->fpstate = FPactive;
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break;
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case FPinactive:
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/*
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* Before restoring the state, check for any pending
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* exceptions, there's no way to restore the state without
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* generating an unmasked exception.
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* More attention should probably be paid here to the
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* exception masks and error summary.
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*/
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if((up->fpsave.status & ~up->fpsave.control) & 0x07F){
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mathnote();
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break;
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}
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fprestore(&up->fpsave);
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up->fpstate = FPactive;
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break;
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case FPactive:
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panic("math emu pid %ld %s pc 0x%lux",
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up->pid, up->text, ureg->pc);
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break;
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}
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}
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/*
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* math coprocessor segment overrun
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*/
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static void
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mathover(Ureg*, void*)
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{
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pexit("math overrun", 0);
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}
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void
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mathinit(void)
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{
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trapenable(VectorCERR, matherror, 0, "matherror");
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if(X86FAMILY(m->cpuidax) == 3)
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intrenable(IrqIRQ13, matherror, 0, BUSUNKNOWN, "matherror");
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trapenable(VectorCNA, mathemu, 0, "mathemu");
|
|
trapenable(VectorCSO, mathover, 0, "mathover");
|
|
}
|
|
|
|
/*
|
|
* set up floating point for a new process
|
|
*/
|
|
void
|
|
procsetup(Proc*p)
|
|
{
|
|
p->fpstate = FPinit;
|
|
fpoff();
|
|
}
|
|
|
|
void
|
|
procrestore(Proc *p)
|
|
{
|
|
uvlong t;
|
|
|
|
if(p->kp)
|
|
return;
|
|
cycles(&t);
|
|
p->pcycles -= t;
|
|
}
|
|
|
|
/*
|
|
* Save the mach dependent part of the process state.
|
|
*/
|
|
void
|
|
procsave(Proc *p)
|
|
{
|
|
uvlong t;
|
|
|
|
cycles(&t);
|
|
p->pcycles += t;
|
|
if(p->fpstate == FPactive){
|
|
if(p->state == Moribund)
|
|
fpclear();
|
|
else{
|
|
/*
|
|
* Fpsave() stores without handling pending
|
|
* unmasked exeptions. Postnote() can't be called
|
|
* here as sleep() already has up->rlock, so
|
|
* the handling of pending exceptions is delayed
|
|
* until the process runs again and generates an
|
|
* emulation fault to activate the FPU.
|
|
*/
|
|
fpsave(&p->fpsave);
|
|
}
|
|
p->fpstate = FPinactive;
|
|
}
|
|
|
|
/*
|
|
* While this processor is in the scheduler, the process could run
|
|
* on another processor and exit, returning the page tables to
|
|
* the free list where they could be reallocated and overwritten.
|
|
* When this processor eventually has to get an entry from the
|
|
* trashed page tables it will crash.
|
|
*
|
|
* If there's only one processor, this can't happen.
|
|
* You might think it would be a win not to do this in that case,
|
|
* especially on VMware, but it turns out not to matter.
|
|
*/
|
|
mmuflushtlb(PADDR(m->pdb));
|
|
}
|
|
|
|
static void
|
|
shutdown(int ispanic)
|
|
{
|
|
int ms, once;
|
|
|
|
lock(&active);
|
|
if(ispanic)
|
|
active.ispanic = ispanic;
|
|
else if(m->machno == 0 && (active.machs & (1<<m->machno)) == 0)
|
|
active.ispanic = 0;
|
|
once = active.machs & (1<<m->machno);
|
|
/*
|
|
* setting exiting will make hzclock() on each processor call exit(0),
|
|
* which calls shutdown(0) and arch->reset(), which on mp systems is
|
|
* mpshutdown, from which there is no return: the processor is idled
|
|
* or initiates a reboot. clearing our bit in machs avoids calling
|
|
* exit(0) from hzclock() on this processor.
|
|
*/
|
|
active.machs &= ~(1<<m->machno);
|
|
active.exiting = 1;
|
|
unlock(&active);
|
|
|
|
if(once)
|
|
iprint("cpu%d: exiting\n", m->machno);
|
|
|
|
/* wait for any other processors to shutdown */
|
|
spllo();
|
|
for(ms = 5*1000; ms > 0; ms -= TK2MS(2)){
|
|
delay(TK2MS(2));
|
|
if(active.machs == 0 && consactive() == 0)
|
|
break;
|
|
}
|
|
|
|
if(active.ispanic){
|
|
if(!cpuserver)
|
|
for(;;)
|
|
halt();
|
|
if(getconf("*debug"))
|
|
delay(5*60*1000);
|
|
else
|
|
delay(10000);
|
|
}else
|
|
delay(1000);
|
|
}
|
|
|
|
void
|
|
reboot(void *entry, void *code, ulong size)
|
|
{
|
|
void (*f)(ulong, ulong, ulong);
|
|
ulong *pdb;
|
|
|
|
writeconf();
|
|
|
|
/*
|
|
* the boot processor is cpu0. execute this function on it
|
|
* so that the new kernel has the same cpu0. this only matters
|
|
* because the hardware has a notion of which processor was the
|
|
* boot processor and we look at it at start up.
|
|
*/
|
|
if (m->machno != 0) {
|
|
procwired(up, 0);
|
|
sched();
|
|
}
|
|
|
|
shutdown(0);
|
|
|
|
/*
|
|
* should be the only processor running now
|
|
*/
|
|
if (m->machno != 0)
|
|
print("on cpu%d (not 0)!\n", m->machno);
|
|
if (active.machs)
|
|
print("still have active ap processors!\n");
|
|
|
|
print("shutting down...\n");
|
|
delay(200);
|
|
|
|
splhi();
|
|
|
|
/* turn off buffered serial console */
|
|
serialoq = nil;
|
|
|
|
/* shutdown devices */
|
|
chandevshutdown();
|
|
arch->introff();
|
|
|
|
/*
|
|
* Modify the machine page table to directly map the low 4MB of memory
|
|
* This allows the reboot code to turn off the page mapping
|
|
*/
|
|
pdb = m->pdb;
|
|
pdb[PDX(0)] = pdb[PDX(KZERO)];
|
|
mmuflushtlb(PADDR(pdb));
|
|
|
|
/* setup reboot trampoline function */
|
|
f = (void*)REBOOTADDR;
|
|
memmove(f, rebootcode, sizeof(rebootcode));
|
|
|
|
print("rebooting...\n");
|
|
|
|
/* off we go - never to return */
|
|
coherence();
|
|
(*f)(PADDR(entry), PADDR(code), size);
|
|
}
|
|
|
|
|
|
void
|
|
exit(int ispanic)
|
|
{
|
|
shutdown(ispanic);
|
|
arch->reset();
|
|
}
|
|
|
|
int
|
|
isaconfig(char *class, int ctlrno, ISAConf *isa)
|
|
{
|
|
char cc[32], *p;
|
|
int i;
|
|
|
|
snprint(cc, sizeof cc, "%s%d", class, ctlrno);
|
|
p = getconf(cc);
|
|
if(p == nil)
|
|
return 0;
|
|
|
|
isa->type = "";
|
|
isa->nopt = tokenize(p, isa->opt, NISAOPT);
|
|
for(i = 0; i < isa->nopt; i++){
|
|
p = isa->opt[i];
|
|
if(cistrncmp(p, "type=", 5) == 0)
|
|
isa->type = p + 5;
|
|
else if(cistrncmp(p, "port=", 5) == 0)
|
|
isa->port = strtoul(p+5, &p, 0);
|
|
else if(cistrncmp(p, "irq=", 4) == 0)
|
|
isa->irq = strtoul(p+4, &p, 0);
|
|
else if(cistrncmp(p, "dma=", 4) == 0)
|
|
isa->dma = strtoul(p+4, &p, 0);
|
|
else if(cistrncmp(p, "mem=", 4) == 0)
|
|
isa->mem = strtoul(p+4, &p, 0);
|
|
else if(cistrncmp(p, "size=", 5) == 0)
|
|
isa->size = strtoul(p+5, &p, 0);
|
|
else if(cistrncmp(p, "freq=", 5) == 0)
|
|
isa->freq = strtoul(p+5, &p, 0);
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
int
|
|
cistrcmp(char *a, char *b)
|
|
{
|
|
int ac, bc;
|
|
|
|
for(;;){
|
|
ac = *a++;
|
|
bc = *b++;
|
|
|
|
if(ac >= 'A' && ac <= 'Z')
|
|
ac = 'a' + (ac - 'A');
|
|
if(bc >= 'A' && bc <= 'Z')
|
|
bc = 'a' + (bc - 'A');
|
|
ac -= bc;
|
|
if(ac)
|
|
return ac;
|
|
if(bc == 0)
|
|
break;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
cistrncmp(char *a, char *b, int n)
|
|
{
|
|
unsigned ac, bc;
|
|
|
|
while(n > 0){
|
|
ac = *a++;
|
|
bc = *b++;
|
|
n--;
|
|
|
|
if(ac >= 'A' && ac <= 'Z')
|
|
ac = 'a' + (ac - 'A');
|
|
if(bc >= 'A' && bc <= 'Z')
|
|
bc = 'a' + (bc - 'A');
|
|
|
|
ac -= bc;
|
|
if(ac)
|
|
return ac;
|
|
if(bc == 0)
|
|
break;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* put the processor in the halt state if we've no processes to run.
|
|
* an interrupt will get us going again.
|
|
*/
|
|
void
|
|
idlehands(void)
|
|
{
|
|
if(conf.nmach == 1)
|
|
halt();
|
|
}
|