xv6-cs450/bootmain.c
2006-09-06 19:08:14 +00:00

120 lines
2.8 KiB
C

// This a dirt simple boot loader, whose sole job is to boot
// an elf kernel image from the first IDE hard disk.
//
// DISK LAYOUT
// * This program(boot.S and main.c) is the bootloader. It should
// be stored in the first sector of the disk.
//
// * The 2nd sector onward holds the kernel image.
//
// * The kernel image must be in ELF format.
//
// BOOT UP STEPS
// * when the CPU boots it loads the BIOS into memory and executes it
//
// * the BIOS intializes devices, sets of the interrupt routines, and
// reads the first sector of the boot device(e.g., hard-drive)
// into memory and jumps to it.
//
// * Assuming this boot loader is stored in the first sector of the
// hard-drive, this code takes over...
//
// * control starts in bootloader.S -- which sets up protected mode,
// and a stack so C code then run, then calls cmain()
//
// * cmain() in this file takes over,
// reads in the kernel and jumps to it.
#include "types.h"
#include "elf.h"
#include "x86.h"
#define SECTSIZE 512
#define ELFHDR ((struct elfhdr*) 0x10000) // scratch space
void readsect(void*, uint);
void readseg(uint, uint, uint);
void
cmain(void)
{
struct proghdr *ph, *eph;
// read 1st page off disk
readseg((uint) ELFHDR, SECTSIZE*8, 0);
// is this a valid ELF?
if(ELFHDR->magic != ELF_MAGIC)
goto bad;
// load each program segment (ignores ph flags)
ph = (struct proghdr*) ((uchar*) ELFHDR + ELFHDR->phoff);
eph = ph + ELFHDR->phnum;
for(; ph < eph; ph++)
readseg(ph->va, ph->memsz, ph->offset);
// call the entry point from the ELF header
// note: does not return!
((void(*)(void)) (ELFHDR->entry & 0xFFFFFF))();
bad:
outw(0x8A00, 0x8A00);
outw(0x8A00, 0x8E00);
for(;;)
;
}
// Read 'count' bytes at 'offset' from kernel into virtual address 'va'.
// Might copy more than asked
void
readseg(uint va, uint count, uint offset)
{
uint end_va;
va &= 0xFFFFFF;
end_va = va + count;
// round down to sector boundary
va &= ~(SECTSIZE - 1);
// translate from bytes to sectors, and kernel starts at sector 1
offset = (offset / SECTSIZE) + 1;
// If this is too slow, we could read lots of sectors at a time.
// We'd write more to memory than asked, but it doesn't matter --
// we load in increasing order.
while(va < end_va) {
readsect((uchar*) va, offset);
va += SECTSIZE;
offset++;
}
}
void
waitdisk(void)
{
// wait for disk reaady
while((inb(0x1F7) & 0xC0) != 0x40)
;
}
void
readsect(void *dst, uint offset)
{
// wait for disk to be ready
waitdisk();
outb(0x1F2, 1); // count = 1
outb(0x1F3, offset);
outb(0x1F4, offset >> 8);
outb(0x1F5, offset >> 16);
outb(0x1F6, (offset >> 24) | 0xE0);
outb(0x1F7, 0x20); // cmd 0x20 - read sectors
// wait for disk to be ready
waitdisk();
// read a sector
insl(0x1F0, dst, SECTSIZE/4);
}