arch/common/boot/grub/docs/multiboot.h

   1 /* multiboot.h - the header for Multiboot */
   2 /* Copyright (C) 1999, 2001  Free Software Foundation, Inc.
   3
   4    This program is free software; you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation; either version 2 of the License, or
   7    (at your option) any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program; if not, write to the Free Software
  16    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
  17
  18 /* Macros.  */
  19
  20 /* The magic number for the Multiboot header.  */
  21 #define MULTIBOOT_HEADER_MAGIC          0x1BADB002
  22
  23 /* The flags for the Multiboot header.  */
  24 #ifdef __ELF__
  25 # define MULTIBOOT_HEADER_FLAGS         0x00000003
  26 #else
  27 # define MULTIBOOT_HEADER_FLAGS         0x00010003
  28 #endif
  29
  30 /* The magic number passed by a Multiboot-compliant boot loader.  */
  31 #define MULTIBOOT_BOOTLOADER_MAGIC      0x2BADB002
  32
  33 /* The size of our stack (16KB).  */
  34 #define STACK_SIZE                      0x4000
  35
  36 /* C symbol format. HAVE_ASM_USCORE is defined by configure.  */
  37 #ifdef HAVE_ASM_USCORE
  38 # define EXT_C(sym)                     _ ## sym
  39 #else
  40 # define EXT_C(sym)                     sym
  41 #endif
  42
  43 #ifndef ASM
  44 /* Do not include here in boot.S.  */
  45
  46 /* Types.  */
  47
  48 /* The Multiboot header.  */
  49 typedef struct multiboot_header
  50 {
  51   unsigned long magic;
  52   unsigned long flags;
  53   unsigned long checksum;
  54   unsigned long header_addr;
  55   unsigned long load_addr;
  56   unsigned long load_end_addr;
  57   unsigned long bss_end_addr;
  58   unsigned long entry_addr;
  59 } multiboot_header_t;
  60
  61 /* The symbol table for a.out.  */
  62 typedef struct aout_symbol_table
  63 {
  64   unsigned long tabsize;
  65   unsigned long strsize;
  66   unsigned long addr;
  67   unsigned long reserved;
  68 } aout_symbol_table_t;
  69
  70 /* The section header table for ELF.  */
  71 typedef struct elf_section_header_table
  72 {
  73   unsigned long num;
  74   unsigned long size;
  75   unsigned long addr;
  76   unsigned long shndx;
  77 } elf_section_header_table_t;
  78
  79 /* The Multiboot information.  */
  80 typedef struct multiboot_info
  81 {
  82   unsigned long flags;
  83   unsigned long mem_lower;
  84   unsigned long mem_upper;
  85   unsigned long boot_device;
  86   unsigned long cmdline;
  87   unsigned long mods_count;
  88   unsigned long mods_addr;
  89   union
  90   {
  91     aout_symbol_table_t aout_sym;
  92     elf_section_header_table_t elf_sec;
  93   } u;
  94   unsigned long mmap_length;
  95   unsigned long mmap_addr;
  96 } multiboot_info_t;
  97
  98 /* The module structure.  */
  99 typedef struct module
 100 {
 101   unsigned long mod_start;
 102   unsigned long mod_end;
 103   unsigned long string;
 104   unsigned long reserved;
 105 } module_t;
 106
 107 /* The memory map. Be careful that the offset 0 is base_addr_low
 108    but no size.  */
 109 typedef struct memory_map
 110 {
 111   unsigned long size;
 112   unsigned long base_addr_low;
 113   unsigned long base_addr_high;
 114   unsigned long length_low;
 115   unsigned long length_high;
 116   unsigned long type;
 117 } memory_map_t;
 118
 119 #endif /* ! ASM */