multiboot.h

一个微型操作系统源码

/*
 * OSV
 * Copyright (C) 2002 Ciprian DOSOFTEI <[e-mail]>
 * All rights reserved.
 * 
 * http://backster.free.fr/osv
 *
 * This file is part of the OSV project. OSV is free software, also known as
 * "open source"; you can redistribute it and/or modify it under the terms 
 * of the GNU General Public License (GPL), version 2, as published by the Free
 * Software Foundation (FSF). To explore alternate licensing terms, contact 
 * the author at [e-mail] or [phone].
 * 
 * OSV 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 GPL for more details.  You should have
 * received a copy of the GPL along with OSV; see the file COPYING.  If
 * not, write to the FSF, 59 Temple Place #330, Boston, MA 02111-1307, USA.
 */

#ifndef INCMULTIBOOT
#define INCMULTIBOOT

#include <types.h>
#include <exit.h>

#define MULTIBOOT_MEMORY	(1L<<0)
#define MULTIBOOT_BOOT_DEVICE	(1L<<1)
#define MULTIBOOT_CMDLINE	(1L<<2)
#define MULTIBOOT_MODS		(1L<<3)
/* #define MULTIBOOT_AOUT_SYMS	(1L<<4) */
#define MULTIBOOT_ELF_SHDR	(1L<<5)
#define MULTIBOOT_MEM_MAP	(1L<<6)


typedef struct mb_module
{
  /* physical start and end addresses of the module data itself.  */
    ulong start;
    ulong end;

  /* arbitrary ASCII-Z string associated with the module.  */
    char *string;

  /* boot loader must set to 0; OS must ignore.  */
    ulong reserved;
} __attribute__ ((packed)) mb_module_t;


typedef struct mem_map
{
    ulong size;
    ulong base_addr_low;
    ulong base_addr_high;
    ulong len_low;
    ulong len_high;
    ulong type;
} __attribute__ ((packed)) mem_map_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;


typedef struct multibootInfo
{
  /* these flags indicate which parts of the multiboot_info are valid;
   * see below for the actual flag bit definitions.  */
    ulong flags;

  /* lower/upper memory installed in the machine.
   * valid only if MULTIBOOT_MEMORY is set in flags word above.  */
    ulong mem_lower;
    ulong mem_upper;

  /* BIOS disk device the kernel was loaded from.
   * Valid only if MULTIBOOT_BOOT_DEVICE is set in flags word above.  */
    ulong boot_device;

  /* command-line for the OS kernel: a null-terminated ASCII string.
   * valid only if MULTIBOOT_CMDLINE is set in flags word above.  */
    char *cmd_line;

  /* list of boot modules loaded with the kernel.
   * valid only if MULTIBOOT_MODS is set in flags word above.  */
    ulong mod_count;
    mb_module_t *modules;

  /* Info about the kernel binary */
    union {
	aout_symbol_table_t aout_sym;
	elf_section_header_table_t elf_sec;
    } u;

  /* memory map -- int 0x15 BIOS call (e820) */
    ulong mmap_length;
    mem_map_t *mmap_addr;
} __attribute__ ((packed)) mb_info_t;

ulong get_available_memory(mb_info_t *bootInfo);
ulong get_used_memory(mb_info_t *bootInfo);
void show_memory_map(mb_info_t *bootInfo);
void show_modules(mb_info_t *bootInfo);

#endif