1/*
2 *  GRUB  --  GRand Unified Bootloader
3 *  Copyright (C) 2000   Free Software Foundation, Inc.
4 *
5 *  This program is free software; you can redistribute it and/or modify
6 *  it under the terms of the GNU General Public License as published by
7 *  the Free Software Foundation; either version 2 of the License, or
8 *  (at your option) any later version.
9 *
10 *  This program is distributed in the hope that it will be useful,
11 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
12 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13 *  GNU General Public License for more details.
14 *
15 *  You should have received a copy of the GNU General Public License
16 *  along with this program; if not, write to the Free Software
17 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
18 */
19
20#ifndef MBOOT_MB_HEADER_H
21#define MBOOT_MB_HEADER_H
22
23#include <inttypes.h>
24
25/*
26 *  MultiBoot Header description
27 */
28
29struct multiboot_header {
30    /* Must be MULTIBOOT_MAGIC - see below.  */
31    uint32_t magic;
32
33    /* Feature flags - see below.  */
34    uint32_t flags;
35
36    /*
37     * Checksum
38     *
39     * The above fields plus this one must equal 0 mod 2^32.
40     */
41    uint32_t checksum;
42
43    /* These are only valid if MULTIBOOT_AOUT_KLUDGE is set.  */
44    uint32_t header_addr;
45    uint32_t load_addr;
46    uint32_t load_end_addr;
47    uint32_t bss_end_addr;
48    uint32_t entry_addr;
49
50    /* These are only valid if MULTIBOOT_VIDEO_MODE is set.  */
51    uint32_t mode_type;
52    uint32_t width;
53    uint32_t height;
54    uint32_t depth;
55};
56
57/*
58 * The entire multiboot_header must be contained
59 * within the first MULTIBOOT_SEARCH bytes of the kernel image.
60 */
61#define MULTIBOOT_SEARCH		8192
62
63/* Magic value identifying the multiboot_header.  */
64#define MULTIBOOT_MAGIC			0x1BADB002
65
66/*
67 * Features flags for 'flags'.
68 * If a boot loader sees a flag in MULTIBOOT_MUSTKNOW set
69 * and it doesn't understand it, it must fail.
70 */
71#define MULTIBOOT_MUSTKNOW		0x0000FFFF
72
73/* currently unsupported flags...  this is a kind of version number.  */
74#define MULTIBOOT_UNSUPPORTED		0x0000FFF8
75
76/* Align all boot modules on i386 page (4KB) boundaries.  */
77#define MULTIBOOT_PAGE_ALIGN		0x00000001
78
79/* Must pass memory information to OS.  */
80#define MULTIBOOT_MEMORY_INFO		0x00000002
81
82/* Must pass video information to OS.  */
83#define MULTIBOOT_VIDEO_MODE		0x00000004
84
85/* This flag indicates the use of the address fields in the header.  */
86#define MULTIBOOT_AOUT_KLUDGE		0x00010000
87
88#endif /* MBOOT_MB_HEADER_H */
89