xv6/main.c

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C
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#include "types.h"
#include "param.h"
#include "mmu.h"
#include "proc.h"
#include "defs.h"
#include "x86.h"
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#include "traps.h"
#include "syscall.h"
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#include "elf.h"
#include "param.h"
#include "spinlock.h"
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extern char edata[], end[];
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extern uint8_t _binary_user1_start[], _binary_user1_size[];
extern uint8_t _binary_usertests_start[], _binary_usertests_size[];
extern uint8_t _binary_userfs_start[], _binary_userfs_size[];
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extern int use_console_lock;
// CPU 0 starts running C code here.
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// This is called main0 not main so that it can have
// a void return type. Gcc can't handle functions named
// main that don't return int. Really.
void
main0(void)
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{
int i;
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struct proc *p;
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// clear BSS
memset(edata, 0, end - edata);
// Make sure interrupts stay disabled on all processors
// until each signals it is ready, by pretending to hold
// an extra lock.
for(i=0; i<NCPU; i++)
cpus[i].nlock++;
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mp_init(); // collect info about this machine
use_console_lock = 1;
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lapic_init(mp_bcpu());
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cprintf("\nxV6\n\n");
pic_init(); // initialize PIC
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kinit(); // physical memory allocator
tvinit(); // trap vectors
idtinit(); // CPU's idt
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// create fake process zero
p = &proc[0];
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memset(p, 0, sizeof *p);
p->state = SLEEPING;
p->sz = 4 * PAGE;
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p->mem = kalloc(p->sz);
memset(p->mem, 0, p->sz);
p->kstack = kalloc(KSTACKSIZE);
p->tf = (struct Trapframe *) (p->kstack + KSTACKSIZE - sizeof(struct Trapframe));
memset(p->tf, 0, sizeof(struct Trapframe));
p->tf->es = p->tf->ds = p->tf->ss = (SEG_UDATA << 3) | 3;
p->tf->cs = (SEG_UCODE << 3) | 3;
p->tf->eflags = FL_IF;
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p->pid = 0;
p->ppid = 0;
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setupsegs(p);
mp_startthem();
// turn on timer and enable interrupts on the local APIC
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lapic_timerinit();
lapic_enableintr();
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// init disk device
//ide_init();
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// Enable interrupts on this processor.
cpus[cpu()].nlock--;
sti();
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p = copyproc(&proc[0]);
load_icode(p, _binary_usertests_start, (uint) _binary_usertests_size);
//load_icode(p, _binary_userfs_start, (uint) _binary_userfs_size);
p->state = RUNNABLE;
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cprintf("loaded userfs\n");
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scheduler();
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}
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// Additional processors start here.
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void
mpmain(void)
{
cprintf("an application processor\n");
idtinit(); // CPU's idt
lapic_init(cpu());
lapic_timerinit();
lapic_enableintr();
// Enable interrupts on this processor.
cpus[cpu()].nlock--;
sti();
scheduler();
}
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void
load_icode(struct proc *p, uint8_t *binary, uint size)
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{
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int i;
struct Elf *elf;
struct Proghdr *ph;
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// Check magic number on binary
elf = (struct Elf*) binary;
cprintf("elf %x magic %x\n", elf, elf->magic);
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;
p->tf->esp = p->sz;
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// Map and load segments as directed.
ph = (struct Proghdr*) (binary + elf->phoff);
for (i = 0; i < elf->phnum; i++, ph++) {
if (ph->type != ELF_PROG_LOAD)
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continue;
cprintf("va %x memsz %d\n", ph->va, ph->memsz);
if (ph->va + ph->memsz < ph->va)
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panic("load_icode: overflow in elf header segment");
if (ph->va + ph->memsz >= p->sz)
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panic("load_icode: icode wants to be above UTOP");
// Load/clear the segment
memmove(p->mem + ph->va, binary + ph->offset, ph->filesz);
memset(p->mem + ph->va + ph->filesz, 0, ph->memsz - ph->filesz);
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}
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}