| /* |
| * Copyright (C) 2009 Juergen Beisert, Pengutronix |
| * |
| * This code was inspired by the GRUB2 project. |
| * |
| * 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., 59 Temple Place, Suite 330, Boston, |
| * MA 02111-1307 USA |
| * |
| */ |
| |
| /** |
| * @file |
| * @brief Common boot sector main routine to be entered by the BIOS |
| */ |
| /** |
| * @fn void _start(void) |
| * |
| * @brief Fix segment:offset settings of some buggy BIOSs |
| */ |
| |
| |
| .file "boot_main.S" |
| .code16 |
| |
| .extern real_start |
| |
| .section .boot_start, "ax" |
| .type _start, @function |
| |
| /* |
| * The BIOS loads this code to address 0x00007c00. |
| * The code should be called with CS:IP 0:0x7c00 (hopefully). |
| */ |
| .globl _start |
| _start: |
| cli /* we're not safe here! */ |
| /* |
| * It seems there are implementations in the wild which call this |
| * code with CS:IP 0x07C0:0000 instead. We fix it immediately. |
| */ |
| ljmp $0, $real_start |
| |
| .size _start, .-_start |
| |