| /* |
| * GRUB -- GRand Unified Bootloader |
| * Copyright (C) 2000 Free Software Foundation, Inc. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| */ |
| |
| /* |
| * MultiBoot Header description |
| */ |
| |
| struct multiboot_header |
| { |
| /* Must be MULTIBOOT_MAGIC - see below. */ |
| unsigned magic; |
| |
| /* Feature flags - see below. */ |
| unsigned flags; |
| |
| /* |
| * Checksum |
| * |
| * The above fields plus this one must equal 0 mod 2^32. |
| */ |
| unsigned checksum; |
| |
| /* These are only valid if MULTIBOOT_AOUT_KLUDGE is set. */ |
| unsigned header_addr; |
| unsigned load_addr; |
| unsigned load_end_addr; |
| unsigned bss_end_addr; |
| unsigned entry_addr; |
| |
| /* These are only valid if MULTIBOOT_VIDEO_MODE is set. */ |
| unsigned mode_type; |
| unsigned width; |
| unsigned height; |
| unsigned depth; |
| }; |
| |
| /* |
| * The entire multiboot_header must be contained |
| * within the first MULTIBOOT_SEARCH bytes of the kernel image. |
| */ |
| #define MULTIBOOT_SEARCH 8192 |
| #define MULTIBOOT_FOUND(addr, len) \ |
| (! ((addr) & 0x3) \ |
| && (len) >= 12 \ |
| && *((int *) (addr)) == MULTIBOOT_MAGIC \ |
| && ! (*((unsigned *) (addr)) + *((unsigned *) (addr + 4)) \ |
| + *((unsigned *) (addr + 8))) \ |
| && (! (MULTIBOOT_AOUT_KLUDGE & *((int *) (addr + 4))) || (len) >= 32) \ |
| && (! (MULTIBOOT_VIDEO_MODE & *((int *) (addr + 4))) || (len) >= 48)) |
| |
| /* Magic value identifying the multiboot_header. */ |
| #define MULTIBOOT_MAGIC 0x1BADB002 |
| |
| /* |
| * Features flags for 'flags'. |
| * If a boot loader sees a flag in MULTIBOOT_MUSTKNOW set |
| * and it doesn't understand it, it must fail. |
| */ |
| #define MULTIBOOT_MUSTKNOW 0x0000FFFF |
| |
| /* currently unsupported flags... this is a kind of version number. */ |
| #define MULTIBOOT_UNSUPPORTED 0x0000FFF8 |
| |
| /* Align all boot modules on i386 page (4KB) boundaries. */ |
| #define MULTIBOOT_PAGE_ALIGN 0x00000001 |
| |
| /* Must pass memory information to OS. */ |
| #define MULTIBOOT_MEMORY_INFO 0x00000002 |
| |
| /* Must pass video information to OS. */ |
| #define MULTIBOOT_VIDEO_MODE 0x00000004 |
| |
| /* This flag indicates the use of the address fields in the header. */ |
| #define MULTIBOOT_AOUT_KLUDGE 0x00010000 |