diff options
Diffstat (limited to 'include/x86/mb_header.h')
| -rw-r--r-- | include/x86/mb_header.h | 90 |
1 files changed, 90 insertions, 0 deletions
diff --git a/include/x86/mb_header.h b/include/x86/mb_header.h new file mode 100644 index 0000000..9bf5e6c --- /dev/null +++ b/include/x86/mb_header.h @@ -0,0 +1,90 @@ +/* + * 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. */ + uint32_t magic; + + /* Feature flags - see below. */ + uint32_t flags; + + /* + * Checksum + * + * The above fields plus this one must equal 0 mod 2^32. + */ + uint32_t checksum; + + /* These are only valid if MULTIBOOT_AOUT_KLUDGE is set. */ + uint32_t header_addr; + uint32_t load_addr; + uint32_t load_end_addr; + uint32_t bss_end_addr; + uint32_t entry_addr; + + /* These are only valid if MULTIBOOT_VIDEO_MODE is set. */ + uint32_t mode_type; + uint32_t width; + uint32_t height; + uint32_t 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 \ + && ! (*((uint32_t *) (addr)) + *((uint32_t *) (addr + 4)) \ + + *((uint32_t *) (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 |