104 lines
2.7 KiB
C
104 lines
2.7 KiB
C
#include "types.h"
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#include "defs.h"
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#include "param.h"
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#include "memlayout.h"
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#include "mmu.h"
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#include "proc.h"
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#include "x86.h"
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extern pde_t *kpgdir;
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extern char end[]; // first address after kernel loaded from ELF file
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static void mpmain(void) __attribute__((noreturn));
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static void startothers(void);
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// Bootstrap processor starts running C code here.
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// Allocate a real stack and switch to it, first
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// doing some setup required for memory allocator to work.
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int
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main(uint64 mbmagic, uint64 mbaddr)
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{
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if(mbmagic != 0x2badb002)
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panic("multiboot header not found");
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kinit1(end, P2V(4*1024*1024)); // phys page allocator
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kvmalloc(); // kernel page table
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mpinit(); // detect other processors
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lapicinit(); // interrupt controller
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seginit(); // segment descriptors
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picinit(); // disable pic
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ioapicinit(); // another interrupt controller
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consoleinit(); // console hardware
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uartinit(); // serial port
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pinit(); // process table
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tvinit(); // trap vectors
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binit(); // buffer cache
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fileinit(); // file table
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ideinit(); // disk
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startothers(); // start other processors
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kinit2(P2V(4*1024*1024), P2V(PHYSTOP)); // must come after startothers()
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userinit(); // first user process
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mpmain();
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return 0;
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}
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// Common CPU setup code.
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static void
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mpmain(void)
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{
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cprintf("cpu%d: starting %d\n", cpuid(), cpuid());
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idtinit(); // load idt register
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xchg(&(mycpu()->started), 1); // tell startothers() we're up
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scheduler(); // start running processes
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}
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// AP processors jump here from entryother.S.
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void
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apmain(void)
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{
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switchkvm();
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seginit();
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lapicinit();
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mpmain();
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}
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void apstart(void);
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// Start the non-boot (AP) processors.
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static void
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startothers(void)
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{
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extern uchar _binary_entryother_start[], _binary_entryother_size[];
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uchar *code;
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struct cpu *c;
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char *stack;
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// Write entry code to unused memory at 0x7000.
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// The linker has placed the image of entryother.S in
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// _binary_entryother_start.
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code = P2V(0x7000);
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memmove(code, _binary_entryother_start, (uint64)_binary_entryother_size);
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for(c = cpus; c < cpus+ncpu; c++){
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if(c == mycpu()) // We've started already.
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continue;
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// Tell entryother.S what stack to use, where to enter, and what
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// pgdir to use. We cannot use kpgdir yet, because the AP processor
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// is running in low memory, so we use entrypgdir for the APs too.
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stack = kalloc();
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*(uint32*)(code-4) = V2P(apstart);
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*(uint64*)(code-12) = (uint64) (stack+KSTACKSIZE);
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lapicstartap(c->apicid, V2P(code));
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// wait for cpu to finish mpmain()
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while(c->started == 0)
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;
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}
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}
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