ref: 8294be6e7c9032e3c472018b53154d5b4faec00c
dir: /os/pc/main.c/
#include "u.h"
#include "../port/lib.h"
#include "mem.h"
#include "dat.h"
#include "fns.h"
#include "io.h"
#include "ureg.h"
extern int main_pool_pcnt;
extern int heap_pool_pcnt;
extern int image_pool_pcnt;
int pckdebug;
Mach *m;
static uchar *sp; /* stack pointer for /boot */
/*
* Where configuration info is left for the loaded programme.
* This will turn into a structure as more is done by the boot loader
* (e.g. why parse the .ini file twice?).
* There are 3584 bytes available at CONFADDR.
*/
#define BOOTLINE ((char*)CONFADDR)
#define BOOTLINELEN 64
#define BOOTARGS ((char*)(CONFADDR+BOOTLINELEN))
#define BOOTARGSLEN (4096-0x200-BOOTLINELEN)
#define MAXCONF 64
char bootdisk[KNAMELEN];
char *confname[MAXCONF];
char *confval[MAXCONF];
int nconf;
static void
options(void)
{
long i, n;
char *cp, *line[MAXCONF], *p, *q;
/*
* parse configuration args from dos file plan9.ini
*/
cp = BOOTARGS; /* where b.com leaves its config */
cp[BOOTARGSLEN-1] = 0;
/*
* Strip out '\r', change '\t' -> ' '.
*/
p = cp;
for(q = cp; *q; q++){
if(*q == '\r')
continue;
if(*q == '\t')
*q = ' ';
*p++ = *q;
}
*p = 0;
n = getfields(cp, line, MAXCONF, 1, "\n");
for(i = 0; i < n; i++){
if(*line[i] == '#')
continue;
cp = strchr(line[i], '=');
if(cp == nil)
continue;
*cp++ = '\0';
confname[nconf] = line[i];
confval[nconf] = cp;
nconf++;
}
}
static void
doc(char *m)
{
int i;
print("%s...\n", m);
for(i = 0; i < 100*1024*1024; i++)
i++;
}
void
main(void)
{
outb(0x3F2, 0x00); /* botch: turn off the floppy motor */
mach0init();
options();
ioinit();
i8250console();
quotefmtinstall();
kbdinit();
i8253init();
cpuidentify();
confinit();
archinit();
xinit();
poolsizeinit();
trapinit();
printinit();
screeninit();
cpuidprint();
mmuinit();
eve = strdup("inferno");
if(arch->intrinit){ /* launches other processors on an mp */
doc("intrinit");
arch->intrinit();
}
doc("timersinit");
timersinit();
doc("mathinit");
mathinit();
doc("kbdenable");
kbdenable();
if(arch->clockenable){
doc("clockinit");
arch->clockenable();
}
doc("procinit");
procinit();
doc("links");
links();
doc("chandevreset");
chandevreset();
doc("userinit");
userinit();
doc("schedinit");
active.thunderbirdsarego = 1;
schedinit();
}
void
mach0init(void)
{
conf.nmach = 1;
MACHP(0) = (Mach*)CPU0MACH;
m->pdb = (ulong*)CPU0PDB;
m->gdt = (Segdesc*)CPU0GDT;
machinit();
active.machs = 1;
active.exiting = 0;
}
void
machinit(void)
{
int machno;
ulong *pdb;
Segdesc *gdt;
machno = m->machno;
pdb = m->pdb;
gdt = m->gdt;
memset(m, 0, sizeof(Mach));
m->machno = machno;
m->pdb = pdb;
m->gdt = gdt;
/*
* For polled uart output at boot, need
* a default delay constant. 100000 should
* be enough for a while. Cpuidentify will
* calculate the real value later.
*/
m->loopconst = 100000;
}
void
init0(void)
{
Osenv *o;
int i;
char buf[2*KNAMELEN];
up->nerrlab = 0;
spllo();
if(waserror())
panic("init0: %r");
/*
* These are o.k. because rootinit is null.
* Then early kproc's will have a root and dot.
*/
o = up->env;
o->pgrp->slash = namec("#/", Atodir, 0, 0);
cnameclose(o->pgrp->slash->name);
o->pgrp->slash->name = newcname("/");
o->pgrp->dot = cclone(o->pgrp->slash);
chandevinit();
if(!waserror()){
ksetenv("cputype", "386", 0);
snprint(buf, sizeof(buf), "386 %s", conffile);
ksetenv("terminal", buf, 0);
for(i = 0; i < nconf; i++){
if(confname[i][0] != '*')
ksetenv(confname[i], confval[i], 0);
ksetenv(confname[i], confval[i], 1);
}
poperror();
}
poperror();
disinit("/osinit.dis");
}
void
userinit(void)
{
Proc *p;
Osenv *o;
p = newproc();
o = p->env;
o->fgrp = newfgrp(nil);
o->pgrp = newpgrp();
kstrdup(&o->user, eve);
strcpy(p->text, "interp");
p->fpstate = FPINIT;
fpoff();
/*
* Kernel Stack
*
* N.B. make sure there's
* 4 bytes for gotolabel's return PC
*/
p->sched.pc = (ulong)init0;
p->sched.sp = (ulong)p->kstack+KSTACK-BY2WD;
ready(p);
}
Conf conf;
char*
getconf(char *name)
{
int i;
for(i = 0; i < nconf; i++)
if(cistrcmp(confname[i], name) == 0)
return confval[i];
return 0;
}
void
confinit(void)
{
char *p;
int pcnt;
ulong maxmem;
if(p = getconf("*maxmem"))
maxmem = strtoul(p, 0, 0);
else
maxmem = 0;
if(p = getconf("*kernelpercent"))
pcnt = 100 - strtol(p, 0, 0);
else
pcnt = 0;
meminit(maxmem);
conf.npage = conf.npage0 + conf.npage1;
if(pcnt < 10)
pcnt = 70;
conf.ialloc = (((conf.npage*(100-pcnt))/100)/2)*BY2PG;
conf.nproc = 100 + ((conf.npage*BY2PG)/MB)*5;
}
void
poolsizeinit(void)
{
ulong nb;
nb = conf.npage*BY2PG;
poolsize(mainmem, (nb*main_pool_pcnt)/100, 0);
poolsize(heapmem, (nb*heap_pool_pcnt)/100, 0);
poolsize(imagmem, (nb*image_pool_pcnt)/100, 1);
}
static char *mathmsg[] =
{
"invalid operation",
"denormalized operand",
"division by zero",
"numeric overflow",
"numeric underflow",
"precision loss",
"stack",
"error",
};
/*
* math coprocessor error
*/
void
matherror(Ureg* ureg, void* arg)
{
ulong status;
int i;
char *msg;
char note[ERRMAX];
USED(arg);
/*
* a write cycle to port 0xF0 clears the interrupt latch attached
* to the error# line from the 387
*/
if(!(m->cpuiddx & 0x01))
outb(0xF0, 0xFF);
/*
* save floating point state to check out error
*/
FPsave(&up->fpsave.env);
status = up->fpsave.env.status;
msg = 0;
for(i = 0; i < 8; i++)
if((1<<i) & status){
msg = mathmsg[i];
sprint(note, "sys: fp: %s fppc=0x%lux", msg, up->fpsave.env.pc);
error(note);
break;
}
if(msg == 0){
sprint(note, "sys: fp: unknown fppc=0x%lux", up->fpsave.env.pc);
error(note);
}
if(ureg->pc & KZERO)
panic("fp: status %lux fppc=0x%lux pc=0x%lux", status,
up->fpsave.env.pc, ureg->pc);
}
/*
* math coprocessor emulation fault
*/
void
mathemu(Ureg* ureg, void* arg)
{
USED(ureg, arg);
switch(up->fpstate){
case FPINIT:
fpinit();
up->fpstate = FPACTIVE;
break;
case FPINACTIVE:
fprestore(&up->fpsave);
up->fpstate = FPACTIVE;
break;
case FPACTIVE:
panic("math emu");
break;
}
}
/*
* math coprocessor segment overrun
*/
void
mathover(Ureg* ureg, void* arg)
{
USED(arg);
print("sys: fp: math overrun pc 0x%lux pid %ld\n", ureg->pc, up->pid);
pexit("math overrun", 0);
}
void
mathinit(void)
{
trapenable(VectorCERR, matherror, 0, "matherror");
if(X86FAMILY(m->cpuidax) == 3)
intrenable(IrqIRQ13, matherror, 0, BUSUNKNOWN, "matherror");
trapenable(VectorCNA, mathemu, 0, "mathemu");
trapenable(VectorCSO, mathover, 0, "mathover");
}
/*
* Save the mach dependent part of the process state.
*/
void
procsave(Proc *p)
{
if(p->fpstate == FPACTIVE){
if(p->state == Moribund)
fpoff();
else
fpsave(&up->fpsave);
p->fpstate = FPINACTIVE;
}
}
void
exit(int ispanic)
{
USED(ispanic);
up = 0;
print("exiting\n");
/* Shutdown running devices */
chandevshutdown();
arch->reset();
}
void
reboot(void)
{
exit(0);
}
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->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;
}
/*
* 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();
}