include/grub/i386/pc/boot.h

   1 /*
   2  *  GRUB  --  GRand Unified Bootloader
   3  *  Copyright (C) 1999,2000,2002   Free Software Foundation, Inc.
   4  *
   5  *  This program is free software; you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License as published by
   7  *  the Free Software Foundation; either version 2 of the License, or
   8  *  (at your option) any later version.
   9  *
  10  *  This program is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with this program; if not, write to the Free Software
  17  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  18  */
  19
  20 #ifndef GRUB_BOOT_MACHINE_HEADER
  21 #define GRUB_BOOT_MACHINE_HEADER        1
  22
  23 /* The signature for bootloader.  */
  24 #define GRUB_BOOT_MACHINE_SIGNATURE     0xaa55
  25
  26 /* The offset of the start of BPB (BIOS Parameter Block).  */
  27 #define GRUB_BOOT_MACHINE_BPB_START     0x3
  28
  29 /* The offset of the end of BPB (BIOS Parameter Block).  */
  30 #define GRUB_BOOT_MACHINE_BPB_END       0x3e
  31
  32 /* The offset of the major version.  */
  33 #define GRUB_BOOT_MACHINE_VER_MAJ       0x3e
  34
  35 /* The offset of BOOT_DRIVE.  */
  36 #define GRUB_BOOT_MACHINE_BOOT_DRIVE    0x40
  37
  38 /* The offset of FORCE_LBA.  */
  39 #define GRUB_BOOT_MACHINE_FORCE_LBA     0x41
  40
  41 /* The offset of KERNEL_ADDRESS.  */
  42 #define GRUB_BOOT_MACHINE_KERNEL_ADDRESS        0x42
  43
  44 /* The offset of KERNEL_SECTOR.  */
  45 #define GRUB_BOOT_MACHINE_KERNEL_SECTOR 0x44
  46
  47 /* The offset of KERNEL_SEGMENT.  */
  48 #define GRUB_BOOT_MACHINE_KERNEL_SEGMENT        0x48
  49
  50 /* The offset of a magic number used by Windows NT.  */
  51 #define GRUB_BOOT_MACHINE_WINDOWS_NT_MAGIC      0x1b8
  52
  53 /* The offset of the start of the partition table.  */
  54 #define GRUB_BOOT_MACHINE_PART_START    0x1be
  55
  56 /* The offset of the end of the partition table.  */
  57 #define GRUB_BOOT_MACHINE_PART_END      0x1fe
  58
  59 /* The stack segment.  */
  60 #define GRUB_BOOT_MACHINE_STACK_SEG     0x2000
  61
  62 /* The segment of disk buffer. The disk buffer MUST be 32K long and
  63    cannot straddle a 64K boundary.  */
  64 #define GRUB_BOOT_MACHINE_BUFFER_SEG    0x7000
  65
  66 /* The address of drive parameters.  */
  67 #define GRUB_BOOT_MACHINE_DRP_ADDR      0x7f00
  68
  69 /* The size of drive parameters.  */
  70 #define GRUB_BOOT_MACHINE_DRP_SIZE      0x42
  71
  72 /* The flag for BIOS drive number to designate a hard disk vs. a
  73    floppy.  */
  74 #define GRUB_BOOT_MACHINE_BIOS_HD_FLAG  0x80
  75
  76 /* The segment where the kernel is loaded.  */
  77 #define GRUB_BOOT_MACHINE_KERNEL_SEG    0x800
  78
  79 /* The address where the kernel is loaded.  */
  80 #define GRUB_BOOT_MACHINE_KERNEL_ADDR   (GRUB_BOOT_MACHINE_KERNEL_SEG << 4)
  81
  82 /* The size of a block list used in the kernel startup code.  */
  83 #define GRUB_BOOT_MACHINE_LIST_SIZE     8
  84
  85 #endif /* ! BOOT_MACHINE_HEADER */