103 lines
2.4 KiB
C
103 lines
2.4 KiB
C
#include "types.h"
|
|
#include "defs.h"
|
|
#include "param.h"
|
|
#include "mmu.h"
|
|
#include "proc.h"
|
|
#include "x86.h"
|
|
|
|
static void bootothers(void);
|
|
|
|
// Bootstrap processor starts running C code here.
|
|
int
|
|
main(void)
|
|
{
|
|
int i;
|
|
static volatile int bcpu; // cannot be on stack
|
|
extern char edata[], end[];
|
|
|
|
// clear BSS
|
|
memset(edata, 0, end - edata);
|
|
|
|
// Prevent release() from enabling interrupts.
|
|
for(i=0; i<NCPU; i++)
|
|
cpus[i].nlock = 1;
|
|
|
|
mp_init(); // collect info about this machine
|
|
bcpu = mp_bcpu();
|
|
|
|
// 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));
|
|
|
|
lapic_init(bcpu);
|
|
cprintf("\ncpu%d: starting xv6\n\n", cpu());
|
|
|
|
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
|
|
bootothers(); // boot other CPUs
|
|
if(!ismp)
|
|
timer_init(); // uniprocessor timer
|
|
userinit(); // first user process
|
|
|
|
// enable interrupts on this processor.
|
|
cpus[cpu()].nlock--;
|
|
sti();
|
|
|
|
scheduler();
|
|
}
|
|
|
|
// Additional processors start here.
|
|
void
|
|
mpmain(void)
|
|
{
|
|
cprintf("cpu%d: starting\n", cpu());
|
|
idtinit();
|
|
lapic_init(cpu());
|
|
setupsegs(0);
|
|
cpuid(0, 0, 0, 0, 0); // memory barrier
|
|
cpus[cpu()].booted = 1;
|
|
|
|
// Enable interrupts on this processor.
|
|
cpus[cpu()].nlock--;
|
|
sti();
|
|
|
|
scheduler();
|
|
}
|
|
|
|
static void
|
|
bootothers(void)
|
|
{
|
|
extern uchar _binary_bootother_start[], _binary_bootother_size[];
|
|
uchar *code;
|
|
struct cpu *c;
|
|
|
|
// Write bootstrap code to unused memory at 0x7000.
|
|
code = (uchar*)0x7000;
|
|
memmove(code, _binary_bootother_start, (uint)_binary_bootother_size);
|
|
|
|
for(c = cpus; c < cpus+ncpu; c++){
|
|
if(c == cpus+cpu()) // We've started already.
|
|
continue;
|
|
|
|
// Fill in %esp, %eip and start code on cpu.
|
|
*(void**)(code-4) = c->mpstack + MPSTACK;
|
|
*(void**)(code-8) = mpmain;
|
|
lapic_startap(c->apicid, (uint)code);
|
|
|
|
// Wait for cpu to get through bootstrap.
|
|
while(c->booted == 0)
|
|
;
|
|
}
|
|
}
|
|
|