void
machinit(void)
{
Mach *m0;
if (m == 0) {
serialputc('?');
serialputc('m');
serialputc('0');
}
if(machaddr[m->machno] != m) {
serialputc('?');
serialputc('m');
serialputc('m');
}
if (canlock(&testlock)) {
serialputc('?');
serialputc('l');
panic("cpu%d: locks don't work", m->machno);
}
m->ticks = 1;
m->perf.period = 1;
m0 = MACHP(0);
if (m->machno != 0) {
/* synchronise with cpu 0 */
m->ticks = m0->ticks;
m->fastclock = m0->fastclock;
m->cpuhz = m0->cpuhz;
m->delayloop = m0->delayloop;
}
if (m->machno != 0 &&
(m->fastclock == 0 || m->cpuhz == 0 || m->delayloop == 0))
panic("buggered cpu 0 Mach");
machon(m->machno);
fpoff();
}
/*
* called on a cpu other than 0 from cpureset in l.s,
* from _vrst in lexception.s.
* mmu and l1 (and system-wide l2) caches and coherency (smpon) are on,
* but interrupts are disabled.
* our mmu is using an exact copy of cpu0's l1 page table
* as it was after userinit ran.
*/
void
cpustart(void)
{
int ms;
ulong *evp;
Power *pwr;
up = nil;
if (active.machs & (1<<m->machno)) {
serialputc('?');
serialputc('r');
panic("cpu%d: resetting after start", m->machno);
}
assert(m->machno != 0);
errata();
cortexa9cachecfg();
memdiag(&testmem);
machinit(); /* bumps nmach, adds bit to machs */
machoff(m->machno); /* not ready to go yet */
/* clock signals and scu are system-wide and already on */
clockshutdown(); /* kill any watch-dog timer */
trapinit();
clockinit(); /* sets loop delay */
timersinit();
cpuidprint();
/*
* notify cpu0 that we're up so it can proceed to l1diag.
*/
evp = (ulong *)soc.exceptvec; /* magic */
*evp = m->machno;
coherence();
l1diag(); /* contend with other cpus to verify sanity */
/*
* pwr->noiopwr == 0
* pwr->detect == 0x1ff (default, all disabled)
*/
pwr = (Power *)soc.power;
assert(pwr->gatests == MASK(7)); /* everything has power */
/*
* 8169 has to initialise before we get past this, thus cpu0
* has to schedule processes first.
*/
if (Debug)
iprint("cpu%d: waiting for 8169\n", m->machno);
for (ms = 0; !l1ptstable.word && ms < 5000; ms += 10) {
delay(10);
cachedinvse(&l1ptstable.word, sizeof l1ptstable.word);
}
if (!l1ptstable.word)
iprint("cpu%d: 8169 unreasonably slow; proceeding\n", m->machno);
/* now safe to copy cpu0's l1 pt in mmuinit */
mmuinit(); /* update our l1 pt from cpu0's */
fpon();
machon(m->machno); /* now ready to go and be scheduled */
if (Debug)
iprint("cpu%d: scheding\n", m->machno);
schedinit();
panic("cpu%d: schedinit returned", m->machno);
}
