/* * 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. * * */ /** * @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