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* This file is part of the coreboot project.
* Copyright (C) 2003 Free Software Foundation, Inc.
* Copyright (C) 2008 Robert Millan
* 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
* 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
* multiboot.h - multiboot header file.
#include <stdint.h>
/* How many bytes from the start of the file we search for the header. */
#define MB_SEARCH 8192
/* The magic field should contain this. */
#define MB_MAGIC 0x1BADB002
/* This should be in %eax. */
#define MB_MAGIC2 0x2BADB002
/* The bits in the required part of flags field we don't support. */
#define MB_UNSUPPORTED 0x0000fffc
/* Alignment of multiboot modules. */
#define MB_MOD_ALIGN 0x00001000
* Flags set in the 'flags' member of the multiboot header.
/* Align all boot modules on i386 page (4KB) boundaries. */
#define MB_PAGE_ALIGN 0x00000001
/* Must pass memory information to OS. */
#define MB_MEMORY_INFO 0x00000002
/* Must pass video information to OS. */
#define MB_VIDEO_MODE 0x00000004
/* This flag indicates the use of the address fields in the header. */
#define MB_AOUT_KLUDGE 0x00010000
* Flags to be set in the 'flags' member of the multiboot info structure.
/* is there basic lower/upper memory information? */
#define MB_INFO_MEMORY 0x00000001
/* is there a boot device set? */
#define MB_INFO_BOOTDEV 0x00000002
/* is the command-line defined? */
#define MB_INFO_CMDLINE 0x00000004
/* are there modules to do something with? */
#define MB_INFO_MODS 0x00000008
/* These next two are mutually exclusive */
/* is there a symbol table loaded? */
#define MB_INFO_AOUT_SYMS 0x00000010
/* is there an ELF section header table? */
#define MB_INFO_ELF_SHDR 0x00000020
/* is there a full memory map? */
#define MB_INFO_MEM_MAP 0x00000040
/* Is there drive info? */
#define MB_INFO_DRIVE_INFO 0x00000080
/* Is there a config table? */
#define MB_INFO_CONFIG_TABLE 0x00000100
/* Is there a boot loader name? */
#define MB_INFO_BOOT_LOADER_NAME 0x00000200
/* Is there a APM table? */
#define MB_INFO_APM_TABLE 0x00000400
/* Is there video information? */
#define MB_INFO_VIDEO_INFO 0x00000800
struct multiboot_header {
/* Must be MB_MAGIC - see above. */
uint32_t magic;
/* Feature flags. */
uint32_t flags;
/* The above fields plus this one must equal 0 mod 2^32. */
uint32_t checksum;
/* These are only valid if MB_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 MB_VIDEO_MODE is set. */
uint32_t mode_type;
uint32_t width;
uint32_t height;
uint32_t depth;
struct multiboot_info {
/* Multiboot info version number */
uint32_t flags;
/* Available memory from BIOS */
uint32_t mem_lower;
uint32_t mem_upper;
/* "root" partition */
uint32_t boot_device;
/* Kernel command line */
uint32_t cmdline;
/* Boot-Module list */
uint32_t mods_count;
uint32_t mods_addr;
uint32_t syms[4];
/* Memory Mapping buffer */
uint32_t mmap_length;
uint32_t mmap_addr;
/* Drive Info buffer */
uint32_t drives_length;
uint32_t drives_addr;
/* ROM configuration table */
uint32_t config_table;
/* Boot Loader Name */
uint32_t boot_loader_name;
/* APM table */
uint32_t apm_table;
/* Video */
uint32_t vbe_control_info;
uint32_t vbe_mode_info;
uint16_t vbe_mode;
uint16_t vbe_interface_seg;
uint16_t vbe_interface_off;
uint16_t vbe_interface_len;
struct multiboot_mmap_entry {
uint32_t size;
uint64_t addr;
uint64_t len;
uint32_t type;
} __attribute__ ((packed));
extern struct multiboot_info *mbi;
unsigned long write_multiboot_info(unsigned long rom_table_end);