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