116 lines
3.2 KiB
C
116 lines
3.2 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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static void startothers(void);
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static void mpmain(void) __attribute__((noreturn));
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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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// 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(void)
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{
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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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cprintf("\ncpu%d: starting xv6\n\n", cpunum());
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picinit(); // another interrupt controller
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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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if(!ismp)
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timerinit(); // uniprocessor timer
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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(); // finish this processor's setup
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}
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// Other CPUs jump here from entryother.S.
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static void
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mpenter(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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// 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\n", cpunum());
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idtinit(); // load idt register
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xchg(&cpu->started, 1); // tell startothers() we're up
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scheduler(); // start running processes
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}
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pde_t entrypgdir[]; // For entry.S
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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, (uint)_binary_entryother_size);
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for(c = cpus; c < cpus+ncpu; c++){
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if(c == cpus+cpunum()) // 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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*(void**)(code-4) = stack + KSTACKSIZE;
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*(void**)(code-8) = mpenter;
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*(int**)(code-12) = (void *) V2P(entrypgdir);
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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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// The boot page table used in entry.S and entryother.S.
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// Page directories (and page tables) must start on page boundaries,
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// hence the __aligned__ attribute.
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// PTE_PS in a page directory entry enables 4Mbyte pages.
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__attribute__((__aligned__(PGSIZE)))
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pde_t entrypgdir[NPDENTRIES] = {
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// Map VA's [0, 4MB) to PA's [0, 4MB)
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[0] = (0) | PTE_P | PTE_W | PTE_PS,
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// Map VA's [KERNBASE, KERNBASE+4MB) to PA's [0, 4MB)
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[KERNBASE>>PDXSHIFT] = (0) | PTE_P | PTE_W | PTE_PS,
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};
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//PAGEBREAK!
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// Blank page.
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//PAGEBREAK!
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