Node: multiboot.h, Next: , Up: Example OS code


This is the source code in the file multiboot.h:

     /* multiboot.h - the header for Multiboot */
     /* Copyright (C) 1999, 2001  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
        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. */
     /* Macros. */
     /* The magic number for the Multiboot header. */
     #define MULTIBOOT_HEADER_MAGIC          0x1BADB002
     /* The flags for the Multiboot header. */
     #ifdef __ELF__
     # define MULTIBOOT_HEADER_FLAGS         0x00000003
     # define MULTIBOOT_HEADER_FLAGS         0x00010003
     /* The magic number passed by a Multiboot-compliant boot loader. */
     /* The size of our stack (16KB). */
     #define STACK_SIZE                      0x4000
     /* C symbol format. HAVE_ASM_USCORE is defined by configure. */
     #ifdef HAVE_ASM_USCORE
     # define EXT_C(sym)                     _ ## sym
     # define EXT_C(sym)                     sym
     #ifndef ASM
     /* Do not include here in boot.S. */
     /* Types. */
     /* The Multiboot header. */
     typedef struct multiboot_header
       unsigned long magic;
       unsigned long flags;
       unsigned long checksum;
       unsigned long header_addr;
       unsigned long load_addr;
       unsigned long load_end_addr;
       unsigned long bss_end_addr;
       unsigned long entry_addr;
     } multiboot_header_t;
     /* The symbol table for a.out. */
     typedef struct aout_symbol_table
       unsigned long tabsize;
       unsigned long strsize;
       unsigned long addr;
       unsigned long reserved;
     } aout_symbol_table_t;
     /* The section header table for ELF. */
     typedef struct elf_section_header_table
       unsigned long num;
       unsigned long size;
       unsigned long addr;
       unsigned long shndx;
     } elf_section_header_table_t;
     /* The Multiboot information. */
     typedef struct multiboot_info
       unsigned long flags;
       unsigned long mem_lower;
       unsigned long mem_upper;
       unsigned long boot_device;
       unsigned long cmdline;
       unsigned long mods_count;
       unsigned long mods_addr;
         aout_symbol_table_t aout_sym;
         elf_section_header_table_t elf_sec;
       } u;
       unsigned long mmap_length;
       unsigned long mmap_addr;
     } multiboot_info_t;
     /* The module structure. */
     typedef struct module
       unsigned long mod_start;
       unsigned long mod_end;
       unsigned long string;
       unsigned long reserved;
     } module_t;
     /* The memory map. Be careful that the offset 0 is base_addr_low
        but no size. */
     typedef struct memory_map
       unsigned long size;
       unsigned long base_addr_low;
       unsigned long base_addr_high;
       unsigned long length_low;
       unsigned long length_high;
       unsigned long type;
     } memory_map_t;
     #endif /* ! ASM */