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 29 struct 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
