ref: a70b93a356662355214f5405edda066786f6dd03
dir: /sys/src/9/bcm/main.c/
#include "u.h"
#include "tos.h"
#include "../port/lib.h"
#include "mem.h"
#include "dat.h"
#include "fns.h"
#include "io.h"
#include "init.h"
#include <pool.h>
#include "reboot.h"
/* Firmware compatibility */
#define Minfirmrev 326770
#define Minfirmdate "22 Jul 2012"
uintptr kseg0 = KZERO;
Mach* machaddr[MAXMACH];
Conf conf;
void
machinit(void)
{
Mach *m0;
m->ticks = 1;
m->perf.period = 1;
m0 = MACHP(0);
if (m->machno != 0) {
/* synchronise with cpu 0 */
m->ticks = m0->ticks;
}
}
void
mach0init(void)
{
m->mmul1 = (PTE*)L1;
m->machno = 0;
machaddr[m->machno] = m;
m->ticks = 1;
m->perf.period = 1;
active.machs[0] = 1;
active.exiting = 0;
up = nil;
}
static void
launchinit(void)
{
int mach;
Mach *mm;
PTE *l1;
for(mach = 1; mach < conf.nmach; mach++){
machaddr[mach] = mm = mallocalign(MACHSIZE, MACHSIZE, 0, 0);
l1 = mallocalign(L1SIZE, L1SIZE, 0, 0);
if(mm == nil || l1 == nil)
panic("launchinit");
memset(mm, 0, MACHSIZE);
mm->machno = mach;
memmove(l1, m->mmul1, L1SIZE); /* clone cpu0's l1 table */
cachedwbse(l1, L1SIZE);
mm->mmul1 = l1;
cachedwbse(mm, MACHSIZE);
}
cachedwbse(machaddr, sizeof machaddr);
if((mach = startcpus(conf.nmach)) < conf.nmach)
print("only %d cpu%s started\n", mach, mach == 1? "" : "s");
}
void
main(void)
{
extern char edata[], end[];
uint fw, board;
m = (Mach*)MACHADDR;
memset(edata, 0, end - edata); /* clear bss */
mach0init();
quotefmtinstall();
bootargsinit(0);
confinit(); /* figures out amount of memory */
xinit();
uartconsinit();
screeninit();
print("\nPlan 9 from Bell Labs\n");
board = getboardrev();
fw = getfirmware();
print("board rev: %#ux firmware rev: %d\n", board, fw);
if(fw < Minfirmrev){
print("Sorry, firmware (start*.elf) must be at least rev %d"
" or newer than %s\n", Minfirmrev, Minfirmdate);
for(;;)
;
}
/* set clock rate to arm_freq from config.txt (default pi1:700Mhz pi2:900MHz) */
setclkrate(ClkArm, 0);
trapinit();
clockinit();
printinit();
timersinit();
cpuidprint();
archreset();
vgpinit();
procinit0();
initseg();
links();
chandevreset(); /* most devices are discovered here */
pageinit();
userinit();
launchinit();
mmuinit1(0);
schedinit();
assert(0); /* shouldn't have returned */
}
/*
* starting place for first process
*/
void
init0(void)
{
char buf[2*KNAMELEN], **sp;
up->nerrlab = 0;
coherence();
spllo();
/*
* These are o.k. because rootinit is null.
* Then early kproc's will have a root and dot.
*/
up->slash = namec("#/", Atodir, 0, 0);
pathclose(up->slash->path);
up->slash->path = newpath("/");
up->dot = cclone(up->slash);
chandevinit();
if(!waserror()){
snprint(buf, sizeof(buf), "%s %s", "ARM", conffile);
ksetenv("terminal", buf, 0);
ksetenv("cputype", "arm", 0);
if(cpuserver)
ksetenv("service", "cpu", 0);
else
ksetenv("service", "terminal", 0);
snprint(buf, sizeof(buf), "-a %s", getethermac());
ksetenv("etherargs", buf, 0);
/* convert plan9.ini variables to #e and #ec */
setconfenv();
poperror();
}
kproc("alarm", alarmkproc, 0);
sp = (char**)(USTKTOP - sizeof(Tos) - 8 - sizeof(sp[0])*4);
sp[3] = sp[2] = sp[1] = nil;
strcpy(sp[0] = (char*)&sp[4], "boot");
touser((uintptr)sp);
assert(0); /* shouldn't have returned */
}
/*
* create the first process
*/
void
userinit(void)
{
Proc *p;
Segment *s;
KMap *k;
Page *pg;
/* no processes yet */
up = nil;
p = newproc();
p->pgrp = newpgrp();
p->egrp = smalloc(sizeof(Egrp));
p->egrp->ref = 1;
p->fgrp = dupfgrp(nil);
p->rgrp = newrgrp();
p->procmode = 0640;
kstrdup(&eve, "");
kstrdup(&p->text, "*init*");
kstrdup(&p->user, eve);
/*
* Kernel Stack
*/
p->sched.pc = (uintptr)init0;
p->sched.sp = (uintptr)p->kstack+KSTACK-sizeof(up->s.args)-sizeof(uintptr);
p->sched.sp = STACKALIGN(p->sched.sp);
/*
* User Stack
*
* Technically, newpage can't be called here because it
* should only be called when in a user context as it may
* try to sleep if there are no pages available, but that
* shouldn't be the case here.
*/
s = newseg(SG_STACK, USTKTOP-USTKSIZE, USTKSIZE/BY2PG);
s->flushme++;
p->seg[SSEG] = s;
pg = newpage(1, 0, USTKTOP-BY2PG);
segpage(s, pg);
k = kmap(pg);
memset((void*)VA(k), 0, BY2PG);
kunmap(k);
/*
* Text
*/
s = newseg(SG_TEXT, UTZERO, 1);
p->seg[TSEG] = s;
pg = newpage(1, 0, UTZERO);
pg->txtflush = ~0;
segpage(s, pg);
k = kmap(s->map[0]->pages[0]);
memmove((void*)VA(k), initcode, sizeof initcode);
kunmap(k);
ready(p);
}
void
confinit(void)
{
int i, userpcnt;
ulong kpages, memsize = 0;
uintptr pa;
char *p;
if(p = getconf("service")){
if(strcmp(p, "cpu") == 0)
cpuserver = 1;
else if(strcmp(p,"terminal") == 0)
cpuserver = 0;
}
if(p = getconf("*kernelpercent"))
userpcnt = 100 - strtol(p, 0, 0);
else
userpcnt = 0;
if(p = getconf("*maxmem"))
memsize = strtoul(p, 0, 0) - PHYSDRAM;
if (memsize < 16*MB) /* sanity */
memsize = 16*MB;
getramsize(&conf.mem[0]);
if(conf.mem[0].limit == 0){
conf.mem[0].base = PHYSDRAM;
conf.mem[0].limit = PHYSDRAM + memsize;
}else if(p != nil)
conf.mem[0].limit = conf.mem[0].base + memsize;
conf.npage = 0;
pa = PADDR(PGROUND((uintptr)end));
/*
* we assume that the kernel is at the beginning of one of the
* contiguous chunks of memory and fits therein.
*/
for(i=0; i<nelem(conf.mem); i++){
/* take kernel out of allocatable space */
if(pa > conf.mem[i].base && pa < conf.mem[i].limit)
conf.mem[i].base = pa;
conf.mem[i].npage = (conf.mem[i].limit - conf.mem[i].base)/BY2PG;
conf.npage += conf.mem[i].npage;
}
if(userpcnt < 10)
userpcnt = 60 + cpuserver*10;
kpages = conf.npage - (conf.npage*userpcnt)/100;
/*
* can't go past the end of virtual memory
* (ulong)-KZERO is 2^32 - KZERO
*/
if(kpages > ((ulong)-KZERO)/BY2PG)
kpages = ((ulong)-KZERO)/BY2PG;
conf.upages = conf.npage - kpages;
conf.ialloc = (kpages/2)*BY2PG;
conf.nmach = getncpus();
/* set up other configuration parameters */
conf.nproc = 100 + ((conf.npage*BY2PG)/MB)*5;
if(cpuserver)
conf.nproc *= 3;
if(conf.nproc > 2000)
conf.nproc = 2000;
conf.nswap = conf.npage*3;
conf.nswppo = 4096;
conf.nimage = 200;
conf.copymode = conf.nmach > 1;
/*
* Guess how much is taken by the large permanent
* datastructures. Mntcache and Mntrpc are not accounted for.
*/
kpages = conf.npage - conf.upages;
kpages *= BY2PG;
kpages -= conf.upages*sizeof(Page)
+ conf.nproc*sizeof(Proc)
+ conf.nimage*sizeof(Image)
+ conf.nswap
+ conf.nswppo*sizeof(Page*);
mainmem->maxsize = kpages;
if(!cpuserver)
/*
* give terminals lots of image memory, too; the dynamic
* allocation will balance the load properly, hopefully.
* be careful with 32-bit overflow.
*/
imagmem->maxsize = kpages;
}
static void
rebootjump(void *entry, void *code, ulong size)
{
void (*f)(void*, void*, ulong);
intrsoff();
intrcpushutdown();
/* redo identity map */
mmuinit1(1);
/* setup reboot trampoline function */
f = (void*)REBOOTADDR;
memmove(f, rebootcode, sizeof(rebootcode));
cacheuwbinv();
(*f)(entry, code, size);
for(;;);
}
/*
* exit kernel either on a panic or user request
*/
void
exit(int)
{
cpushutdown();
splfhi();
if(m->machno == 0)
archreboot();
rebootjump(0, 0, 0);
}
/*
* stub for ../omap/devether.c
*/
int
isaconfig(char *, int, ISAConf *)
{
return 0;
}
/*
* the new kernel is already loaded at address `code'
* of size `size' and entry point `entry'.
*/
void
reboot(void *entry, void *code, ulong size)
{
writeconf();
while(m->machno != 0){
procwired(up, 0);
sched();
}
cpushutdown();
delay(2000);
splfhi();
/* turn off buffered serial console */
serialoq = nil;
/* shutdown devices */
chandevshutdown();
/* stop the clock (and watchdog if any) */
clockshutdown();
wdogoff();
/* off we go - never to return */
rebootjump(entry, code, size);
}
void
setupwatchpts(Proc *, Watchpt *, int n)
{
if(n > 0)
error("no watchpoints");
}