include/grub/i386/pc/boot.h

   1 /*
   2  *  GRUB  --  GRand Unified Bootloader
   3  *  Copyright (C) 1999,2000,2002,2005,2006,2007,2008   Free Software Foundation, Inc.
   4  *
   5  *  GRUB 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 3 of the License, or
   8  *  (at your option) any later version.
   9  *
  10  *  GRUB 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 GRUB.  If not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19 #ifndef GRUB_BOOT_MACHINE_HEADER
  20 #define GRUB_BOOT_MACHINE_HEADER        1
  21
  22 /* The signature for bootloader.  */
  23 #define GRUB_BOOT_MACHINE_SIGNATURE     0xaa55
  24
  25 /* The offset of the start of BPB (BIOS Parameter Block).  */
  26 #define GRUB_BOOT_MACHINE_BPB_START     0x3
  27
  28 /* The offset of the end of BPB (BIOS Parameter Block).  */
  29 #define GRUB_BOOT_MACHINE_BPB_END       0x3e
  30
  31 /* The offset of the major version.  */
  32 #define GRUB_BOOT_MACHINE_VER_MAJ       0x3e
  33
  34 /* The offset of BOOT_DRIVE.  */
  35 #define GRUB_BOOT_MACHINE_BOOT_DRIVE    0x4c
  36
  37 /* The offset of ROOT_DRIVE.  */
  38 #define GRUB_BOOT_MACHINE_ROOT_DRIVE    0x4d
  39
  40 /* The offset of KERNEL_ADDRESS.  */
  41 #define GRUB_BOOT_MACHINE_KERNEL_ADDRESS        0x40
  42
  43 /* The offset of KERNEL_SECTOR.  */
  44 #define GRUB_BOOT_MACHINE_KERNEL_SECTOR 0x44
  45
  46 /* The offset of KERNEL_SEGMENT.  */
  47 #define GRUB_BOOT_MACHINE_KERNEL_SEGMENT        0x42
  48
  49 /* The offset of BOOT_DRIVE_CHECK.  */
  50 #define GRUB_BOOT_MACHINE_DRIVE_CHECK   0x4f
  51
  52 /* The offset of a magic number used by Windows NT.  */
  53 #define GRUB_BOOT_MACHINE_WINDOWS_NT_MAGIC      0x1b8
  54
  55 /* The offset of the start of the partition table.  */
  56 #define GRUB_BOOT_MACHINE_PART_START    0x1be
  57
  58 /* The offset of the end of the partition table.  */
  59 #define GRUB_BOOT_MACHINE_PART_END      0x1fe
  60
  61 /* The stack segment.  */
  62 #define GRUB_BOOT_MACHINE_STACK_SEG     0x2000
  63
  64 /* The segment of disk buffer. The disk buffer MUST be 32K long and
  65    cannot straddle a 64K boundary.  */
  66 #define GRUB_BOOT_MACHINE_BUFFER_SEG    0x7000
  67
  68 /* The flag for BIOS drive number to designate a hard disk vs. a
  69    floppy.  */
  70 #define GRUB_BOOT_MACHINE_BIOS_HD_FLAG  0x80
  71
  72 /* The segment where the kernel is loaded.  */
  73 #define GRUB_BOOT_MACHINE_KERNEL_SEG    0x800
  74
  75 /* The address where the kernel is loaded.  */
  76 #define GRUB_BOOT_MACHINE_KERNEL_ADDR   (GRUB_BOOT_MACHINE_KERNEL_SEG << 4)
  77
  78 /* The size of a block list used in the kernel startup code.  */
  79 #define GRUB_BOOT_MACHINE_LIST_SIZE     12
  80
  81 #endif /* ! BOOT_MACHINE_HEADER */