ref: 157d7ebdbd7479b271e7b1df744b2dfc6b5816e9
dir: /sys/src/9/bcm64/main.c/
#include "u.h"
#include "tos.h"
#include "../port/lib.h"
#include "mem.h"
#include "dat.h"
#include "fns.h"
#include "../port/error.h"
#include "io.h"
#include "init.h"
#include "sysreg.h"
#include <pool.h>
#include <libsec.h>
Conf conf;
ulong memsize = GiB;
/*
* starting place for first process
*/
void
init0(void)
{
char buf[2*KNAMELEN], **sp;
up->nerrlab = 0;
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", "ARM64", conffile);
ksetenv("terminal", buf, 0);
ksetenv("cputype", "arm64", 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[1] = (char*)&sp[4], "boot");
sp[0] = (void*)&sp[1];
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);
*(void**)p->sched.sp = kproc; // fake
/*
* 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;
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")) != nil){
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
* (uintptr)-KZERO is 2^32 - KZERO
*/
if(kpages > ((uintptr)-KZERO)/BY2PG)
kpages = ((uintptr)-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;
}
void
machinit(void)
{
m->ticks = 1;
m->perf.period = 1;
active.machs[m->machno] = 1;
}
void
mpinit(void)
{
extern void _start(void);
int i;
for(i = 0; i < MAXMACH; i++)
((uintptr*)SPINTABLE)[i] = 0;
for(i = 1; i < conf.nmach; i++)
MACHP(i)->machno = i;
cachedwbinv();
for(i = 1; i < conf.nmach; i++)
((uintptr*)SPINTABLE)[i] = PADDR(_start);
cachedwbinvse((void*)SPINTABLE, MAXMACH*8);
sev();
delay(100);
sev();
synccycles();
}
void
main(void)
{
machinit();
if(m->machno){
trapinit();
fpuinit();
clockinit();
cpuidprint();
synccycles();
timersinit();
flushtlb();
mmu1init();
m->ticks = MACHP(0)->ticks;
schedinit();
return;
}
bootargsinit();
confinit();
xinit();
printinit();
fmtinstall('H', encodefmt);
quotefmtinstall();
uartconsinit();
screeninit();
print("\nPlan 9\n");
xsummary();
/* set clock rate to arm_freq from config.txt */
setclkrate(ClkArm, 0);
trapinit();
fpuinit();
clockinit();
cpuidprint();
timersinit();
pageinit();
procinit0();
initseg();
links();
chandevreset();
userinit();
mpinit();
mmu0clear((uintptr*)L1);
flushtlb();
mmu1init();
schedinit();
}
void
exit(int)
{
cpushutdown();
for(;;);
}
void
reboot(void*, void*, ulong)
{
error(Egreg);
}
/*
* stub for ../omap/devether.c
*/
int
isaconfig(char *, int, ISAConf *)
{
return 0;
}