MdePkg/Include/IndustryStandard/ElTorito.h

   1 /** @file
   2   ElTorito Partitions Format Definition.
   3
   4 Copyright (c) 2006, Intel Corporation
   5 All rights reserved. This program and the accompanying materials
   6 are licensed and made available under the terms and conditions of the BSD License
   7 which accompanies this distribution.  The full text of the license may be found at
   8 http://opensource.org/licenses/bsd-license.php
   9
  10 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  11 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  12
  13 --*/
  14
  15 #ifndef _ELTORITO_H_
  16 #define _ELTORITO_H_
  17
  18 //
  19 // CDROM_VOLUME_DESCRIPTOR.Types
  20 //
  21 #define CDVOL_TYPE_STANDARD 0x0
  22 #define CDVOL_TYPE_CODED    0x1
  23 #define CDVOL_TYPE_END      0xFF
  24
  25 //
  26 // CDROM_VOLUME_DESCRIPTOR.Id
  27 //
  28 #define CDVOL_ID  "CD001"
  29
  30 //
  31 // CDROM_VOLUME_DESCRIPTOR.SystemId
  32 //
  33 #define CDVOL_ELTORITO_ID "EL TORITO SPECIFICATION"
  34
  35 //
  36 // Indicator types
  37 //
  38 #define ELTORITO_ID_CATALOG               0x01
  39 #define ELTORITO_ID_SECTION_BOOTABLE      0x88
  40 #define ELTORITO_ID_SECTION_NOT_BOOTABLE  0x00
  41 #define ELTORITO_ID_SECTION_HEADER        0x90
  42 #define ELTORITO_ID_SECTION_HEADER_FINAL  0x91
  43
  44 //
  45 // ELTORITO_CATALOG.Boot.MediaTypes
  46 //
  47 #define ELTORITO_NO_EMULATION 0x00
  48 #define ELTORITO_12_DISKETTE  0x01
  49 #define ELTORITO_14_DISKETTE  0x02
  50 #define ELTORITO_28_DISKETTE  0x03
  51 #define ELTORITO_HARD_DISK    0x04
  52
  53
  54 #pragma pack(1)
  55
  56 //
  57 // El Torito Volume Descriptor
  58 // Note that the CDROM_VOLUME_DESCRIPTOR does not match the ISO-9660
  59 // descriptor.  For some reason descriptor used by El Torito is
  60 // different, but they start the same.   The El Torito descriptor
  61 // is left shifted 1 byte starting with the SystemId.  (Note this
  62 // causes the field to get unaligned)
  63 //
  64 typedef struct {
  65   UINT8   Type;
  66   CHAR8   Id[5];  // CD001
  67   UINT8   Version;
  68   CHAR8   SystemId[26];
  69   CHAR8   Unused[38];
  70   UINT8   EltCatalog[4];
  71   CHAR8   Unused2[5];
  72   UINT32  VolSpaceSize[2];
  73 } CDROM_VOLUME_DESCRIPTOR;
  74
  75 //
  76 // Catalog Entry
  77 //
  78 typedef union {
  79   struct {
  80     CHAR8       Reserved[0x20];
  81   } Unknown;
  82
  83   //
  84   // Catalog validation entry (Catalog header)
  85   //
  86   struct {
  87     UINT8   Indicator;
  88     UINT8   PlatformId;
  89     UINT16  Reserved;
  90     CHAR8   ManufacId[24];
  91     UINT16  Checksum;
  92     UINT16  Id55AA;
  93   } Catalog;
  94
  95   //
  96   // Initial/Default Entry or Section Entry
  97   //
  98   struct {
  99     UINT8   Indicator;
 100     UINT8   MediaType : 4;
 101     UINT8   Reserved1 : 4;
 102     UINT16  LoadSegment;
 103     UINT8   SystemType;
 104     UINT8   Reserved2;
 105     UINT16  SectorCount;
 106     UINT32  Lba;
 107   } Boot;
 108
 109   //
 110   // Section Header Entry
 111   //
 112   struct {
 113     UINT8   Indicator;
 114     UINT8   PlatformId;
 115     UINT16  SectionEntries;
 116     CHAR8   Id[28];
 117   } Section;
 118
 119 } ELTORITO_CATALOG;
 120
 121 #pragma pack()
 122
 123 #endif