EdkModulePkg/Universal/Disk/Partition/Dxe/ElTorito.h

   1 /*++
   2
   3 Copyright (c) 2006, Intel Corporation
   4 All rights reserved. This program and the accompanying materials
   5 are licensed and made available under the terms and conditions of the BSD License
   6 which accompanies this distribution.  The full text of the license may be found at
   7 http://opensource.org/licenses/bsd-license.php
   8
   9 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  10 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  11
  12 Module Name:
  13
  14   ElTorito.h
  15
  16 Abstract:
  17
  18   Data Structures required for detecting ElTorito Partitions
  19
  20 Revision History
  21
  22 --*/
  23
  24 #ifndef _ELTORITO_H_
  25 #define _ELTORITO_H_
  26
  27 #pragma pack(1)
  28 //
  29 // CDROM_VOLUME_DESCRIPTOR.Types
  30 //
  31 #define CDVOL_TYPE_STANDARD 0x0
  32 #define CDVOL_TYPE_CODED    0x1
  33 #define CDVOL_TYPE_END      0xFF
  34
  35 //
  36 // CDROM_VOLUME_DESCRIPTOR.Id
  37 //
  38 #define CDVOL_ID  "CD001"
  39
  40 //
  41 // CDROM_VOLUME_DESCRIPTOR.SystemId
  42 //
  43 #define CDVOL_ELTORITO_ID "EL TORITO SPECIFICATION"
  44
  45 //
  46 // Indicator types
  47 //
  48 #define ELTORITO_ID_CATALOG               0x01
  49 #define ELTORITO_ID_SECTION_BOOTABLE      0x88
  50 #define ELTORITO_ID_SECTION_NOT_BOOTABLE  0x00
  51 #define ELTORITO_ID_SECTION_HEADER        0x90
  52 #define ELTORITO_ID_SECTION_HEADER_FINAL  0x91
  53
  54 //
  55 // ELTORITO_CATALOG.Boot.MediaTypes
  56 //
  57 #define ELTORITO_NO_EMULATION 0x00
  58 #define ELTORITO_12_DISKETTE  0x01
  59 #define ELTORITO_14_DISKETTE  0x02
  60 #define ELTORITO_28_DISKETTE  0x03
  61 #define ELTORITO_HARD_DISK    0x04
  62
  63 //
  64 // El Torito Volume Descriptor
  65 // Note that the CDROM_VOLUME_DESCRIPTOR does not match the ISO-9660
  66 // descriptor.  For some reason descriptor used by El Torito is
  67 // different, but they start the same.   The El Torito descriptor
  68 // is left shifted 1 byte starting with the SystemId.  (Note this
  69 // causes the field to get unaligned)
  70 //
  71 typedef struct {
  72   UINT8   Type;
  73   CHAR8   Id[5];  // CD001
  74   UINT8   Version;
  75   CHAR8   SystemId[26];
  76   CHAR8   Unused[38];
  77   UINT8   EltCatalog[4];
  78   CHAR8   Unused2[5];
  79   UINT32  VolSpaceSize[2];
  80 } CDROM_VOLUME_DESCRIPTOR;
  81
  82 //
  83 // Catalog Entry
  84 //
  85 typedef union {
  86   struct {
  87     CHAR8       Reserved[0x20];
  88   } Unknown;
  89
  90   //
  91   // Catalog validation entry (Catalog header)
  92   //
  93   struct {
  94     UINT8   Indicator;
  95     UINT8   PlatformId;
  96     UINT16  Reserved;
  97     CHAR8   ManufacId[24];
  98     UINT16  Checksum;
  99     UINT16  Id55AA;
 100   } Catalog;
 101
 102   //
 103   // Initial/Default Entry or Section Entry
 104   //
 105   struct {
 106     UINT8   Indicator;
 107     UINT8   MediaType : 4;
 108     UINT8   Reserved1 : 4;
 109     UINT16  LoadSegment;
 110     UINT8   SystemType;
 111     UINT8   Reserved2;
 112     UINT16  SectorCount;
 113     UINT32  Lba;
 114   } Boot;
 115
 116   //
 117   // Section Header Entry
 118   //
 119   struct {
 120     UINT8   Indicator;
 121     UINT8   PlatformId;
 122     UINT16  SectionEntries;
 123     CHAR8   Id[28];
 124   } Section;
 125
 126 } ELTORITO_CATALOG;
 127
 128 #pragma pack()
 129
 130 #endif