pc-bios/linux_boot.S

   1 /*
   2  * QEMU Boot sector to launch a preloaded Linux kernel
   3  * Copyright (c) 2004 Fabrice Bellard
   4  */
   5
   6 #define LOAD_SEG 0x9000
   7
   8 .code16
   9 .text
  10         .globl  _start
  11
  12 _start:
  13         cli
  14         cld
  15         mov $LOAD_SEG, %ax
  16         mov %ax, %ds
  17         mov %ax, %es
  18         mov %ax, %fs
  19         mov %ax, %gs
  20         mov %ax, %ss
  21         mov $0x8ffe, %sp
  22         ljmp $LOAD_SEG + 0x20, $0
  23
  24 1:
  25         .fill 510 - (1b - _start), 1, 0
  26
  27         /* boot sector signature */
  28         .byte 0x55
  29         .byte 0xaa