2007-10-31 22:35:13 +00:00
|
|
|
/*
|
|
|
|
|
* GRUB -- GRand Unified Bootloader
|
2008-07-31 19:33:23 +00:00
|
|
|
* Copyright (C) 1999,2000,2001,2002,2003,2005,2006,2007,2008 Free Software Foundation, Inc.
|
2007-10-31 22:35:13 +00:00
|
|
|
*
|
|
|
|
|
* GRUB 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 3 of the License, or
|
|
|
|
|
* (at your option) any later version.
|
|
|
|
|
*
|
|
|
|
|
* GRUB 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 GRUB. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
|
*/
|
|
|
|
|
|
|
|
|
|
#include <grub/symbol.h>
|
|
|
|
|
#include <grub/machine/memory.h>
|
|
|
|
|
#include <grub/cpu/linux.h>
|
2008-08-14 18:59:33 +00:00
|
|
|
#include <grub/cpu/kernel.h>
|
2007-10-31 22:35:13 +00:00
|
|
|
#include <multiboot.h>
|
|
|
|
|
#include <multiboot2.h>
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* Note: GRUB is compiled with the options -mrtd and -mregparm=3.
|
|
|
|
|
* So the first three arguments are passed in %eax, %edx, and %ecx,
|
|
|
|
|
* respectively, and if a function has a fixed number of arguments
|
|
|
|
|
* and the number if greater than three, the function must return
|
|
|
|
|
* with "ret $N" where N is ((the number of arguments) - 3) * 4.
|
|
|
|
|
*/
|
|
|
|
|
|
|
|
|
|
.file "startup.S"
|
|
|
|
|
.text
|
|
|
|
|
.globl start, _start
|
2008-07-30 10:42:11 +00:00
|
|
|
start:
|
|
|
|
|
_start:
|
|
|
|
|
jmp codestart
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* This is a special data area at a fixed offset from the beginning.
|
|
|
|
|
*/
|
|
|
|
|
|
2009-03-22 00:37:49 +00:00
|
|
|
. = _start + GRUB_KERNEL_CPU_PREFIX
|
2008-07-30 10:42:11 +00:00
|
|
|
|
|
|
|
|
VARIABLE(grub_prefix)
|
|
|
|
|
/* to be filled by grub-mkimage */
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* Leave some breathing room for the prefix.
|
|
|
|
|
*/
|
|
|
|
|
|
2009-03-22 00:37:49 +00:00
|
|
|
. = _start + GRUB_KERNEL_CPU_DATA_END
|
2007-10-31 22:35:13 +00:00
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* Support for booting GRUB from a Multiboot boot loader (e.g. GRUB itself).
|
|
|
|
|
*/
|
2008-11-11 23:27:18 +00:00
|
|
|
.p2align 2 /* force 4-byte alignment */
|
2007-10-31 22:35:13 +00:00
|
|
|
multiboot_header:
|
|
|
|
|
/* magic */
|
|
|
|
|
.long 0x1BADB002
|
|
|
|
|
/* flags */
|
2008-11-11 23:27:18 +00:00
|
|
|
.long MULTIBOOT_MEMORY_INFO
|
2007-10-31 22:35:13 +00:00
|
|
|
/* checksum */
|
2008-11-11 23:27:18 +00:00
|
|
|
.long -0x1BADB002 - MULTIBOOT_MEMORY_INFO
|
2007-10-31 22:35:13 +00:00
|
|
|
|
2008-07-30 10:42:11 +00:00
|
|
|
codestart:
|
2010-05-01 12:32:48 +00:00
|
|
|
#ifdef GRUB_MACHINE_MULTIBOOT
|
2009-12-24 14:09:06 +00:00
|
|
|
cmpl $MULTIBOOT_BOOTLOADER_MAGIC, %eax
|
2008-11-11 23:27:18 +00:00
|
|
|
jne 0f
|
|
|
|
|
movl %ebx, EXT_C(startup_multiboot_info)
|
|
|
|
|
0:
|
2010-05-01 12:32:48 +00:00
|
|
|
#endif
|
2008-11-11 23:27:18 +00:00
|
|
|
|
2007-10-31 22:35:13 +00:00
|
|
|
/* initialize the stack */
|
|
|
|
|
movl $GRUB_MEMORY_MACHINE_PROT_STACK, %esp
|
|
|
|
|
|
|
|
|
|
/* jump to the main body of C code */
|
|
|
|
|
jmp EXT_C(grub_main)
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* prot_to_real and associated structures (but NOT real_to_prot, that is
|
|
|
|
|
* only needed for BIOS gates).
|
|
|
|
|
*/
|
|
|
|
|
#include "../realmode.S"
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* Routines needed by Linux and Multiboot loaders.
|
|
|
|
|
*/
|
|
|
|
|
#include "../loader.S"
|
