MdePkg/Include/Uefi/UefiGpt.h

   1 /** @file
   2   EFI Guid Partition Table Format Definition.
   3
   4   Copyright (c) 2006 - 2008, 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 __UEFI_GPT_H__
  16 #define __UEFI_GPT_H__
  17
  18 ///
  19 /// The primary GUID Partition Table Header must be
  20 /// located in LBA 1 (i.e., the second logical block).
  21 ///
  22 #define PRIMARY_PART_HEADER_LBA 1
  23
  24 ///
  25 /// EFI Partition Table Signature: "EFI PART"
  26 ///
  27 #define EFI_PTAB_HEADER_ID      0x5452415020494645ULL
  28
  29 #pragma pack(1)
  30
  31 ///
  32 /// GPT Partition Table Header
  33 ///
  34 typedef struct {
  35   ///
  36   /// The table header for the GPT partition Table.
  37   /// This header contains EFI_PTAB_HEADER_ID
  38   ///
  39   EFI_TABLE_HEADER  Header;
  40   ///
  41   /// The LBA that contains this data structure.
  42   ///
  43   EFI_LBA           MyLBA;
  44   ///
  45   /// LBA address of the alternate GUID Partition Table Header.
  46   ///
  47   EFI_LBA           AlternateLBA;
  48   ///
  49   /// The first usable logical block that may be used
  50   /// by a partition described by a GUID Partition Entry.
  51   ///
  52   EFI_LBA           FirstUsableLBA;
  53   ///
  54   /// The last usable logical block that may be used
  55   /// by a partition described by a GUID Partition Entry.
  56   ///
  57   EFI_LBA           LastUsableLBA;
  58   ///
  59   /// GUID that can be used to uniquely identify the disk.
  60   ///
  61   EFI_GUID          DiskGUID;
  62   ///
  63   /// The starting LBA of the GUID Partition Entry array.
  64   ///
  65   EFI_LBA           PartitionEntryLBA;
  66   ///
  67   /// The number of Partition Entries in the GUID Partition Entry array.
  68   ///
  69   UINT32            NumberOfPartitionEntries;
  70   ///
  71   /// The size, in bytes, of each the GUID Partition
  72   /// Entry structures in the GUID Partition Entry
  73   /// array. Must be a multiple of 8.
  74   ///
  75   UINT32            SizeOfPartitionEntry;
  76   ///
  77   /// The CRC32 of the GUID Partition Entry array.
  78   /// Starts at PartitionEntryLBA and is
  79   /// computed over a byte length of
  80   /// NumberOfPartitionEntries * SizeOfPartitionEntry.
  81   ///
  82   UINT32            PartitionEntryArrayCRC32;
  83 } EFI_PARTITION_TABLE_HEADER;
  84
  85 ///
  86 /// GPT Partition Entry
  87 ///
  88 typedef struct {
  89   ///
  90   /// Unique ID that defines the purpose and type of this Partition. A value of
  91   /// zero defines that this partition entry is not being used.
  92   ///
  93   EFI_GUID  PartitionTypeGUID;
  94   ///
  95   /// GUID that is unique for every partition entry. Every partition ever
  96   /// created will have a unique GUID.
  97   /// This GUID must be assigned when the GUID Partition Entry is created.
  98   ///
  99   EFI_GUID  UniquePartitionGUID;
 100   ///
 101   /// Starting LBA of the partition defined by this entry
 102   ///
 103   EFI_LBA   StartingLBA;
 104   ///
 105   /// Ending LBA of the partition defined by this entry.
 106   ///
 107   EFI_LBA   EndingLBA;
 108   ///
 109   /// Attribute bits, all bits reserved by UEFI
 110   /// Bit 0 Required for the platform to function.
 111   /// Bits 1-47 Undefined and must be zero.
 112   /// Bits 48-63 Reserved for GUID specific use.
 113   ///
 114   UINT64    Attributes;
 115   ///
 116   /// Unicode string.
 117   ///
 118   CHAR16    PartitionName[36];
 119 } EFI_PARTITION_ENTRY;
 120
 121 #pragma pack()
 122 #endif
 123
 124