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