1/* 2 * 3 * Copyright (C) 2008 Advanced Micro Devices, Inc. 4 * Copyright (C) 2017 Patrick Rudolph <siro@das-labor.org> 5 * Copyright (C) 2024 Google Inc. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. The name of the author may not be used to endorse or promote products 16 * derived from this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31#define MB_MAGIC 0x1BADB002 32#define MB_FLAGS 0x00010003 33 34 jmp _init 35 36/* 37 * Note: The Multiboot standard requires Multiboot header to be placed 38 * below 0x2000 in the resulting image. See: 39 * http://www.gnu.org/software/grub/manual/multiboot/html_node/OS-image-format.html 40 */ 41mb_header: 42 .long MB_MAGIC 43 .long MB_FLAGS 44 .long -(MB_MAGIC + MB_FLAGS) 45 .long mb_header 46 .long _start 47 .long _edata 48 .long _end 49 .long _init 50 51_init: 52 /* Store EAX and EBX */ 53 movl %eax, loader_eax 54 movl %ebx, loader_ebx 55