/*
* Scheduling thread run as the main loop of cpu 0
* Used in AMP sched.
*/
static void
mach0sched(void)
{
Mach *m = machp();
Schedq *rq;
Proc *p;
Mach *mp;
uint32_t start, now;
int n, i; //, j;
assert(m->machno == 0);
acmodeset(NIXKC); /* we don't time share any more */
n = 0;
start = perfticks();
loop:
/*
* find a ready process that we might run.
*/
spllo();
for(rq = &run.runq[Nrq-1]; rq >= run.runq; rq--)
for(p = rq->head; p; p = p->rnext){
/*
* wired processes may only run when their core is available.
*/
if(p->wired != nil){
if(p->wired->proc == nil)
goto found;
continue;
}
/*
* find a ready process that did run at an available core
* or one that has not moved for some time.
*/
if(p->mp == nil || p->mp->proc == nil || n>0){
goto found;
}
}
/* waste time or halt the CPU */
idlehands();
/* remember how much time we're here */
now = perfticks();
m->perf.inidle += now-start;
start = now;
n++;
goto loop;
found:
assert(m->machno == 0);
splhi();
/*
* find a core for this process, but honor wiring.
*/
mp = p->wired;
if(mp != nil){
if(mp->proc != nil)
goto loop;
}else{
for(i = 0; i < MACHMAX; i++){
/*j = pickcore(p->color, i);
if((mp = sys->machptr[j]) != nil && mp->online && mp->nixtype == NIXTC){*/
if((mp = sys->machptr[i]) != nil){ // && mp->online && mp->nixtype == NIXTC){
if(mp != m && mp->proc == nil)
break;
}
}
if(i == MACHMAX){
preemptfor(p);
goto loop;
}
}
p = dequeueproc(&run, rq, p);
mp->proc = p;
if(p != nil){
p->state = Scheding;
p->mp = mp;
}
n = 0;
goto loop;
}
void
squidboy(int apicno)
{
char *n[] = {
[NIXAC] "AC",
[NIXTC] "TC",
[NIXKC] "KC"
};
vlong hz;
sys->machptr[m->machno] = m;
setmachsched(m);
/*
* Need something for initial delays
* until a timebase is worked out.
*/
m->cpuhz = 2000000000ll;
m->cpumhz = 2000;
m->perf.period = 1;
m->nixtype = NIXAC;
DBG("Hello Squidboy %d %d\n", apicno, m->machno);
vsvminit(MACHSTKSZ, m->nixtype);
/*
* Beware the Curse of The Non-Interruptable Were-Temporary.
*/
hz = archhz();
if(hz == 0)
ndnr();
m->cpuhz = hz;
m->cyclefreq = hz;
m->cpumhz = hz/1000000ll;
mmuinit();
if(!apiconline())
ndnr();
fpuinit();
acmodeset(m->nixtype);
m->splpc = 0;
m->online = 1;
/*
* CAUTION: no time sync done, etc.
*/
DBG("Wait for the thunderbirds!\n");
while(!active.thunderbirdsarego)
;
wrmsr(0x10, sys->epoch);
m->rdtsc = rdtsc();
print("cpu%d color %d role %s tsc %lld\n",
m->machno, corecolor(m->machno), n[m->nixtype], m->rdtsc);
switch(m->nixtype){
case NIXAC:
acmmuswitch();
acinit();
adec(&active.nbooting);
ainc(&active.nonline); /* this was commented out */
acsched();
panic("squidboy");
break;
case NIXTC:
/*
* We only need the idt and syscall entry point actually.
* At boot time the boot processor might set our role after
* we have decided to become an AC.
*/
vsvminit(MACHSTKSZ, NIXTC);
/*
* Enable the timer interrupt.
*/
apicpri(0);
timersinit();
adec(&active.nbooting);
ainc(&active.nonline); /* this was commented out */
schedinit();
break;
}
panic("squidboy returns (type %d)", m->nixtype);
}
void
squidboy(int apicno, Mach *m)
{
// FIX QEMU. extern int64_t hz;
int64_t hz;
sys->machptr[m->machno] = m;
/*
* Need something for initial delays
* until a timebase is worked out.
*/
m->cpuhz = 2000000000ll;
m->cpumhz = 2000;
m->perf.period = 1;
m->nixtype = NIXAC;
// no NIXAC for now.
m->nixtype = NIXTC;
// NOTE: you can't do ANYTHING here before vsvminit.
// PRINT WILL PANIC. So wait.
vsvminit(MACHSTKSZ, m->nixtype, m);
//DBG("Hello squidboy %d %d\n", apicno, m->machno);
/*
* Beware the Curse of The Non-Interruptable Were-Temporary.
*/
hz = archhz();
/* Intel cpu's in archk10 must be reviewed */
if(hz == 0)
hz = 2000000000ll;
m->cpuhz = hz;
m->cyclefreq = hz;
m->cpumhz = hz/1000000ll;
mmuinit();
if(!apiconline())
ndnr();
fpuinit();
acmodeset(m->nixtype);
m->splpc = 0;
m->online = 1;
/*
* CAUTION: no time sync done, etc.
* Stupid print to avoid up = nil or
* last cpu couldn't start in nixquids.
*/
DBG("Wait for the thunderbirds!\n");
while(!active.thunderbirdsarego)
;
wrmsr(0x10, sys->epoch);
m->rdtsc = rdtsc();
print("cpu%d color %d role %s tsc %lld\n",
m->machno, corecolor(m->machno), rolename[m->nixtype], m->rdtsc);
switch(m->nixtype){
case NIXAC:
acmmuswitch();
acinit();
adec(&active.nbooting);
ainc(&active.nonline); /* this was commented out */
acsched();
panic("squidboy");
break;
case NIXTC:
/*
* We only need the idt and syscall entry point actually.
* At boot time the boot processor might set our role after
* we have decided to become an AC.
*/
vsvminit(MACHSTKSZ, NIXTC, m);
/*
* Enable the timer interrupt.
*/
apictimerenab();
apicpri(0);
timersinit();
adec(&active.nbooting);
ainc(&active.nonline);
/* Ready? steady? going to timer */
ndnr();
schedinit();
break;
}
panic("squidboy returns (type %d)", m->nixtype);
}
