164 lines
4 KiB
C
164 lines
4 KiB
C
#include "types.h"
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#include "param.h"
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#include "mmu.h"
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#include "proc.h"
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#include "defs.h"
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#include "x86.h"
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#include "traps.h"
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#include "syscall.h"
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#include "elf.h"
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#include "param.h"
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#include "spinlock.h"
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extern char edata[], end[];
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extern uchar _binary_userfs_start[], _binary_userfs_size[];
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extern uchar _binary_init_start[], _binary_init_size[];
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// CPU 0 starts running C code here.
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// This is called main0 not main so that it can have
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// a void return type. Gcc can't handle functions named
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// main that don't return int. Really.
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void
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main0(void)
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{
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int i;
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struct proc *p;
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lcr4(0); // xxx copy of cpu #
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// clear BSS
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memset(edata, 0, end - edata);
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// Make sure interrupts stay disabled on all processors
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// until each signals it is ready, by pretending to hold
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// an extra lock.
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// xxx maybe replace w/ acquire remembering if FL_IF
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for(i=0; i<NCPU; i++){
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cpus[i].nlock++;
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cpus[i].guard1 = 0xdeadbeef;
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cpus[i].guard2 = 0xdeadbeef;
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}
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mp_init(); // collect info about this machine
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lapic_init(mp_bcpu());
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cprintf("\n\ncpu%d: booting xv6\n\n", cpu());
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pinit();
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binit();
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pic_init(); // initialize PIC
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ioapic_init();
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kinit(); // physical memory allocator
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tvinit(); // trap vectors
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idtinit(); // this CPU's idt register
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fd_init();
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iinit();
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// create a fake process per CPU
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// so each CPU always has a tss and a gdt
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for(p = &proc[0]; p < &proc[NCPU]; p++){
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p->state = IDLEPROC;
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p->kstack = cpus[p-proc].mpstack;
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p->pid = p - proc;
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}
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// fix process 0 so that copyproc() will work
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p = &proc[0];
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p->sz = 4 * PAGE;
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p->mem = kalloc(p->sz);
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memset(p->mem, 0, p->sz);
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p->kstack = kalloc(KSTACKSIZE);
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p->tf = (struct trapframe *) (p->kstack + KSTACKSIZE - sizeof(struct trapframe));
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memset(p->tf, 0, sizeof(struct trapframe));
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p->tf->es = p->tf->ds = p->tf->ss = (SEG_UDATA << 3) | 3;
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p->tf->cs = (SEG_UCODE << 3) | 3;
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p->tf->eflags = FL_IF;
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setupsegs(p);
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// initialize I/O devices, let them enable interrupts
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console_init();
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ide_init();
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mp_startthem();
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// turn on timer and enable interrupts on the local APIC
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lapic_timerinit();
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lapic_enableintr();
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// Enable interrupts on this processor.
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cprintf("cpu%d: nlock %d before -- and sti\n",
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cpu(), cpus[0].nlock);
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cpus[cpu()].nlock--;
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sti();
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p = copyproc(&proc[0]);
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//load_icode(p, _binary_usertests_start, (uint) _binary_usertests_size);
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//load_icode(p, _binary_userfs_start, (uint) _binary_userfs_size);
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load_icode(p, _binary_init_start, (uint) _binary_init_size);
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p->state = RUNNABLE;
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cprintf("loaded init\n");
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scheduler();
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}
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// Additional processors start here.
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void
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mpmain(void)
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{
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lcr4(1); // xxx copy of cpu #
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cprintf("cpu%d: starting\n", cpu());
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idtinit(); // CPU's idt
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if(cpu() == 0)
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panic("mpmain on cpu 0");
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lapic_init(cpu());
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lapic_timerinit();
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lapic_enableintr();
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setupsegs(&proc[cpu()]);
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cpuid(0, 0, 0, 0, 0); // memory barrier
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cpus[cpu()].booted = 1;
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// Enable interrupts on this processor.
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cprintf("cpu%d: initial nlock %d\n", cpu(), cpus[cpu()].nlock);
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cpus[cpu()].nlock--;
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sti();
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scheduler();
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}
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void
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load_icode(struct proc *p, uchar *binary, uint size)
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{
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int i;
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struct elfhdr *elf;
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struct proghdr *ph;
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// Check magic number on binary
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elf = (struct elfhdr*) binary;
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cprintf("elf %x magic %x\n", elf, elf->magic);
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if (elf->magic != ELF_MAGIC)
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panic("load_icode: not an ELF binary");
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p->tf->eip = elf->entry;
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p->tf->esp = p->sz;
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// Map and load segments as directed.
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ph = (struct proghdr*) (binary + elf->phoff);
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for (i = 0; i < elf->phnum; i++, ph++) {
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if (ph->type != ELF_PROG_LOAD)
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continue;
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cprintf("va %x memsz %d\n", ph->va, ph->memsz);
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if (ph->va + ph->memsz < ph->va)
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panic("load_icode: overflow in elf header segment");
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if (ph->va + ph->memsz >= p->sz)
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panic("load_icode: icode wants to be above UTOP");
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// Load/clear the segment
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memmove(p->mem + ph->va, binary + ph->offset, ph->filesz);
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memset(p->mem + ph->va + ph->filesz, 0, ph->memsz - ph->filesz);
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}
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}
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