mirror of
https://git.proxmox.com/git/grub2
synced 2025-08-18 09:36:57 +00:00
6a8ae39eb5
git-subtree-dir: debian/grub-extras git-subtree-mainline:955d61226agit-subtree-split:f2a0794419
99 lines
1.8 KiB
ArmAsm
99 lines
1.8 KiB
ArmAsm
/*
|
|
* GRUB Utilities -- Utilities for GRUB Legacy, GRUB2 and GRUB for DOS
|
|
* Copyright (C) 2007 Bean (bean123@126.com)
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
*/
|
|
|
|
#include <grub/machine/kernel.h>
|
|
|
|
.file "g2hdr.S"
|
|
|
|
.text
|
|
|
|
.code16
|
|
|
|
.globl start, _start
|
|
|
|
start:
|
|
_start:
|
|
|
|
// We are at 0x2000:0
|
|
// Move itself to 0x800:0
|
|
// Don't modify dx
|
|
|
|
cld
|
|
movw %cs, %ax
|
|
movw %ax, %ds
|
|
movw $0x800, %ax
|
|
movw %ax, %es
|
|
xorw %si, %si
|
|
movw %si, %di
|
|
movw $0x80, %cx
|
|
|
|
rep
|
|
movsl
|
|
|
|
ljmp $0, $(jump_start-start+0x8000)
|
|
|
|
jump_start:
|
|
// Move data from 0x2040:0 to 0x820:0
|
|
|
|
movw $0x2040, %ax
|
|
movw %ax, %ds
|
|
movw $0x820, %ax
|
|
movw %ax, %es
|
|
xorl %eax, %eax
|
|
movb %dh, (GRUB_DECOMPRESSOR_I386_PC_BOOT_DEVICE + 2)
|
|
movl GRUB_DECOMPRESSOR_MACHINE_COMPRESSED_SIZE, %eax
|
|
addl $GRUB_DECOMPRESSOR_I386_PC_MAX_DECOMPRESSOR_SIZE, %eax
|
|
xorl %ecx, %ecx
|
|
|
|
1:
|
|
xorw %si, %si
|
|
movw %si, %di
|
|
|
|
movw $0x8000, %cx
|
|
cmpl %ecx, %eax
|
|
jae 2f
|
|
movw %ax, %cx
|
|
2:
|
|
|
|
pushw %cx
|
|
addw $3, %cx
|
|
shrw $2, %cx
|
|
|
|
rep
|
|
movsl
|
|
|
|
popw %cx
|
|
|
|
movw %ds, %si
|
|
addw $0x800, %si
|
|
movw %si, %ds
|
|
|
|
movw %es, %si
|
|
addw $0x800, %si
|
|
movw %si, %es
|
|
|
|
subl %ecx, %eax
|
|
jnz 1b
|
|
|
|
ljmp $0, $(0x8000 + 0x200)
|
|
|
|
. = _start + 0x200 - 2
|
|
|
|
.word 0xAA55
|