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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 2 | pj | 1 | /* |
| 2 | * GRUB -- GRand Unified Bootloader |
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| 3 | * Copyright (C) 1996 Erich Boleyn <erich@uruk.org> |
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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 | |||
| 20 | /* |
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| 21 | * MultiBoot Header description |
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| 22 | * |
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| 23 | * |
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| 24 | * struct multiboot_header |
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| 25 | * { |
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| 26 | * Must be MULTIBOOT_MAGIC - see below. |
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| 27 | * unsigned magic; |
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| 28 | * |
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| 29 | * Feature flags - see below. |
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| 30 | * unsigned flags; |
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| 31 | * |
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| 32 | * |
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| 33 | * Checksum |
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| 34 | * |
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| 35 | * The above fields plus this one must equal 0 mod 2^32. |
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| 36 | * |
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| 37 | * unsigned checksum; |
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| 38 | * |
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| 39 | * These are only valid if MULTIBOOT_AOUT_KLUDGE is set. |
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| 40 | * unsigned header_addr; |
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| 41 | * unsigned load_addr; |
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| 42 | * unsigned load_end_addr; |
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| 43 | * unsigned bss_end_addr; |
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| 44 | * unsigned entry_addr; |
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| 45 | * }; |
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| 46 | */ |
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| 47 | |||
| 48 | /* |
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| 49 | * The entire multiboot_header must be contained |
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| 50 | * within the first MULTIBOOT_SEARCH bytes of the kernel image. |
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| 51 | * #define MULTIBOOT_SEARCH 8192 |
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| 52 | * #define MULTIBOOT_FOUND(addr, len) \ |
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| 53 | * (!((addr) & 0x3) && ((len) >= 12) && (*((int *)(addr)) == MULTIBOOT_MAGIC) \ |
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| 54 | * && !(*((unsigned *)(addr)) + *((unsigned *)(addr+4)) \ |
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| 55 | * + *((unsigned *)(addr+8))) \ |
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| 56 | * && (!(MULTIBOOT_AOUT_KLUDGE & *((int *)(addr+4))) || ((len) >= 32))) |
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| 57 | */ |
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| 58 | |||
| 59 | /* Magic value identifying the multiboot_header. */ |
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| 60 | #define MULTIBOOT_MAGIC 0x1BADB002 |
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| 61 | |||
| 62 | /* |
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| 63 | * Features flags for 'flags'. |
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| 64 | * If a boot loader sees a flag in MULTIBOOT_MUSTKNOW set |
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| 65 | * and it doesn't understand it, it must fail. |
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| 66 | */ |
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| 67 | #define MULTIBOOT_MUSTKNOW 0x0000FFFF |
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| 68 | |||
| 69 | /* currently unsupported flags... this is a kind of version number. */ |
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| 70 | #define MULTIBOOT_UNSUPPORTED 0x0000FFFC |
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| 71 | |||
| 72 | /* Align all boot modules on i386 page (4KB) boundaries. */ |
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| 73 | #define MULTIBOOT_PAGE_ALIGN 0x00000001 |
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| 74 | |||
| 75 | /* Must pass memory information to OS. */ |
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| 76 | #define MULTIBOOT_MEMORY_INFO 0x00000002 |
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| 77 | |||
| 78 | /* This flag indicates the use of the other fields in the header. */ |
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| 79 | #define MULTIBOOT_AOUT_KLUDGE 0x00010000 |
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| 80 |