xv6/main.c

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2.4 KiB
C
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#include "types.h"
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#include "defs.h"
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#include "param.h"
#include "mmu.h"
#include "proc.h"
#include "x86.h"
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static void bootothers(void);
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// Bootstrap processor starts running C code here.
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int
main(void)
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{
int i;
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static volatile int bcpu; // cannot be on stack
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extern char edata[], end[];
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// clear BSS
memset(edata, 0, end - edata);
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// Prevent release() from enabling interrupts.
for(i=0; i<NCPU; i++)
cpus[i].nlock = 1;
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mp_init(); // collect info about this machine
bcpu = mp_bcpu();
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// 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));
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lapic_init(bcpu);
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cprintf("\ncpu%d: starting xv6\n\n", cpu());
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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)
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timer_init(); // uniprocessor timer
userinit(); // first user process
// enable interrupts on this processor.
cpus[cpu()].nlock--;
sti();
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scheduler();
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}
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// Additional processors start here.
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static void
mpmain(void)
{
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cprintf("cpu%d: starting\n", cpu());
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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();
}
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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;
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// 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)
;
}
}