multiboot.h

一个操作系统的源代码

/** multiboot.h
 **
 ** Original Author: Kasper Verdich Lund
 ** Date: 10/11/99
 **
 ** Description:
 ** Multiboot standard definitions
 **
 ** 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 or 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., 59 Temple Place, Suite 330,
 ** Boston, MA 02111-1307 USA
 **
 *********************************************************Apostle OS**/

#ifndef __MULTIBOOT_H_
#define __MULTIBOOT_H_

#include <types.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 multibootModule
{
  /* physical start and end addresses of the module data itself.  */
  dword start;
  dword end;
  
  /* arbitrary ASCII-Z string associated with the module.  */
  char *string;

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

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

  /* lower/upper memory installed in the machine.
   * valid only if MULTIBOOT_MEMORY is set in flags word above.  */
  dword memoryLower;
  dword memoryUpper;
  
  /* BIOS disk device the kernel was loaded from.
   * Valid only if MULTIBOOT_BOOT_DEVICE is set in flags word above.  */
  byte bootDevice[4];

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

  /* list of boot modules loaded with the kernel.
   * valid only if MULTIBOOT_MODS is set in flags word above.  */
  dword modulesCount;
  multibootModule *modules;
} __attribute__ ((packed)) multibootInfo;

dword AvailableMemory(multibootInfo *bootInfo);
dword UsedMemory(multibootInfo *bootInfo);
multibootInfo *CopyMultibootInfo(multibootInfo *bootInfo);

#endif /* __MULTIBOOT_H_ */