root / pc-bios / linux_boot.S @ 9d0869b6
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| 1 | 07ce05ea | bellard | /* |
|---|---|---|---|
| 2 | 07ce05ea | bellard | * QEMU Boot sector to launch a preloaded Linux kernel |
| 3 | 07ce05ea | bellard | * Copyright (c) 2004 Fabrice Bellard |
| 4 | 07ce05ea | bellard | */ |
| 5 | 07ce05ea | bellard | |
| 6 | 07ce05ea | bellard | #define LOAD_SEG 0x9000 |
| 7 | 07ce05ea | bellard | |
| 8 | 07ce05ea | bellard | .code16 |
| 9 | 07ce05ea | bellard | .text |
| 10 | a735aa31 | bellard | .globl _start |
| 11 | 07ce05ea | bellard | |
| 12 | a735aa31 | bellard | _start: |
| 13 | 07ce05ea | bellard | cli |
| 14 | 07ce05ea | bellard | cld |
| 15 | 07ce05ea | bellard | mov $LOAD_SEG, %ax |
| 16 | 07ce05ea | bellard | mov %ax, %ds |
| 17 | 07ce05ea | bellard | mov %ax, %es |
| 18 | 07ce05ea | bellard | mov %ax, %fs |
| 19 | 07ce05ea | bellard | mov %ax, %gs |
| 20 | 07ce05ea | bellard | mov %ax, %ss |
| 21 | 07ce05ea | bellard | mov $0x8ffe, %sp |
| 22 | 07ce05ea | bellard | ljmp $LOAD_SEG + 0x20, $0 |
| 23 | 07ce05ea | bellard | |
| 24 | 07ce05ea | bellard | 1: |
| 25 | a735aa31 | bellard | .fill 510 - (1b - _start), 1, 0 |
| 26 | 07ce05ea | bellard | |
| 27 | 07ce05ea | bellard | /* boot sector signature */ |
| 28 | 07ce05ea | bellard | .byte 0x55 |
| 29 | 07ce05ea | bellard | .byte 0xaa |