113 lines
2.7 KiB
C
113 lines
2.7 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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extern char edata[], end[];
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extern int acpu;
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extern char _binary_user1_start[], _binary_user1_size[];
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extern char _binary_usertests_start[], _binary_usertests_size[];
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char buf[512];
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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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if (acpu) {
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cprintf("an application processor\n");
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release_spinlock(&kernel_lock);
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acquire_spinlock(&kernel_lock);
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idtinit(); // CPU's idt
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lapic_init(cpu());
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curproc[cpu()] = &proc[0]; // XXX
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swtch();
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}
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acpu = 1;
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// clear BSS
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memset(edata, 0, end - edata);
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cprintf("\nxV6\n\n");
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pic_init(); // initialize PIC
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mp_init(); // multiprocessor
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kinit(); // physical memory allocator
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tvinit(); // trap vectors
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idtinit(); // CPU's idt
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// create fake process zero
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p = &proc[0];
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curproc[cpu()] = p;
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p->state = WAITING;
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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->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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write_eflags(read_eflags() | FL_IF);
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// turn on interrupts on boot processor
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lapic_timerinit();
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lapic_enableintr();
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#if 0
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ide_init();
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ide_read(0, buf, 1);
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cprintf("sec0.0 %x\n", buf[0] & 0xff);
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#endif
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p = newproc();
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load_icode(p, _binary_usertests_start, (unsigned) _binary_usertests_size);
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swtch();
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return 0;
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}
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void
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load_icode(struct proc *p, uint8_t *binary, unsigned size)
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{
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int i;
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struct Elf *elf;
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struct Proghdr *ph;
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// Check magic number on binary
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elf = (struct Elf*) binary;
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cprintf("elf %x magic %x\n", elf, elf->e_magic);
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if (elf->e_magic != ELF_MAGIC)
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panic("load_icode: not an ELF binary");
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p->tf->tf_eip = elf->e_entry;
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p->tf->tf_esp = p->sz;
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// Map and load segments as directed.
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ph = (struct Proghdr*) (binary + elf->e_phoff);
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for (i = 0; i < elf->e_phnum; i++, ph++) {
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if (ph->p_type != ELF_PROG_LOAD)
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continue;
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cprintf("va %x memsz %d\n", ph->p_va, ph->p_memsz);
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if (ph->p_va + ph->p_memsz < ph->p_va)
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panic("load_icode: overflow in elf header segment");
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if (ph->p_va + ph->p_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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memcpy(p->mem + ph->p_va, binary + ph->p_offset, ph->p_filesz);
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memset(p->mem + ph->p_va + ph->p_filesz, 0, ph->p_memsz - ph->p_filesz);
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}
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}
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