81 lines
1.6 KiB
C
81 lines
1.6 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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extern char edata[], end[];
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int
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main()
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{
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struct proc *p;
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int i;
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// clear BSS
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memset(edata, 0, end - edata);
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// partially initizialize PIC
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outb(0x20+1, 0xFF); // IO_PIC1
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outb(0xA0+1, 0xFF); // IO_PIC2
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outb(0x20, 0x11);
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outb(0x20+1, 32);
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cprintf("\nxV6\n\n");
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kinit(); // physical memory allocator
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tinit(); // traps and interrupts
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// create fake process zero
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p = &proc[0];
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curproc = p;
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p->state = WAITING;
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p->sz = 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->tf_es = p->tf->tf_ds = p->tf->tf_ss = (SEG_UDATA << 3) | 3;
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p->tf->tf_cs = (SEG_UCODE << 3) | 3;
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p->tf->tf_eflags = FL_IF;
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p->pid = 0;
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p->ppid = 0;
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setupsegs(p);
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p = newproc();
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i = 0;
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p->mem[i++] = 0x90; // nop
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p->mem[i++] = 0xb8; // mov ..., %eax
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p->mem[i++] = SYS_fork;
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p->mem[i++] = 0;
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p->mem[i++] = 0;
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p->mem[i++] = 0;
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p->mem[i++] = 0xcd; // int
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p->mem[i++] = T_SYSCALL;
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p->mem[i++] = 0xb8; // mov ..., %eax
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p->mem[i++] = SYS_wait;
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p->mem[i++] = 0;
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p->mem[i++] = 0;
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p->mem[i++] = 0;
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p->mem[i++] = 0xcd; // int
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p->mem[i++] = T_SYSCALL;
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p->mem[i++] = 0xb8; // mov ..., %eax
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p->mem[i++] = SYS_exit;
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p->mem[i++] = 0;
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p->mem[i++] = 0;
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p->mem[i++] = 0;
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p->mem[i++] = 0xcd; // int
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p->mem[i++] = T_SYSCALL;
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p->tf->tf_eip = 0;
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p->tf->tf_esp = p->sz;
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swtch();
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return 0;
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}
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