xv6-65oo2/main.c

91 lines
2.1 KiB
C
Raw Normal View History

2006-06-12 15:22:12 +00:00
#include "types.h"
#include "param.h"
#include "mmu.h"
#include "proc.h"
#include "defs.h"
#include "x86.h"
2006-06-15 16:02:20 +00:00
#include "traps.h"
#include "syscall.h"
2006-06-22 20:47:23 +00:00
#include "elf.h"
#include "param.h"
#include "spinlock.h"
2006-06-12 15:22:12 +00:00
2006-06-13 22:08:20 +00:00
extern char edata[], end[];
2006-06-12 15:22:12 +00:00
2006-09-08 14:36:44 +00:00
// Bootstrap processor starts running C code here.
2006-07-16 16:03:51 +00:00
// This is called main0 not main so that it can have
// a void return type. Gcc can't handle functions named
// main that don't return int. Really.
void
main0(void)
2006-06-12 15:22:12 +00:00
{
int i;
2007-08-24 19:36:52 +00:00
static volatile int bcpu; // cannot be on stack
2006-06-13 22:08:20 +00:00
// clear BSS
memset(edata, 0, end - edata);
2006-08-29 19:06:37 +00:00
// Prevent release() from enabling interrupts.
for(i=0; i<NCPU; i++)
cpus[i].nlock = 1;
2006-07-12 17:00:54 +00:00
mp_init(); // collect info about this machine
bcpu = mp_bcpu();
2007-08-24 19:36:52 +00:00
// Switch to bootstrap processor's stack
asm volatile("movl %0, %%esp" : : "r" (cpus[bcpu].mpstack+MPSTACK-32));
asm volatile("movl %0, %%ebp" : : "r" (cpus[bcpu].mpstack+MPSTACK));
2006-07-12 17:00:54 +00:00
lapic_init(bcpu);
2006-07-12 17:00:54 +00:00
2006-08-29 19:06:37 +00:00
cprintf("\ncpu%d: starting xv6\n\n", cpu());
2006-06-12 15:22:12 +00:00
pinit(); // process table
binit(); // buffer cache
pic_init(); // interrupt controller
ioapic_init(); // another interrupt controller
kinit(); // physical memory allocator
tvinit(); // trap vectors
idtinit(); // interrupt descriptor table
fileinit(); // file table
iinit(); // inode cache
setupsegs(0); // segments & TSS
console_init(); // I/O devices & their interrupts
ide_init(); // disk
mp_startthem(); // other CPUs
if(ismp){
lapic_timerinit(); // smp timer
lapic_enableintr(); // local interrupts
}else
pit8253_timerinit(); // uniprocessor timer
userinit(); // first user process
// enable interrupts on this processor.
cpus[cpu()].nlock--;
sti();
2006-06-16 20:29:25 +00:00
2006-07-11 01:07:40 +00:00
scheduler();
2006-06-12 15:22:12 +00:00
}
2006-06-22 20:47:23 +00:00
// Additional processors start here.
2006-07-16 16:03:51 +00:00
void
mpmain(void)
{
cprintf("cpu%d: starting\n", cpu());
2007-08-24 19:36:52 +00:00
idtinit();
lapic_init(cpu());
lapic_timerinit();
lapic_enableintr();
setupsegs(0);
cpuid(0, 0, 0, 0, 0); // memory barrier
cpus[cpu()].booted = 1;
// Enable interrupts on this processor.
cpus[cpu()].nlock--;
sti();
scheduler();
}