2 EFI Guid Partition Table Format Definition.
4 Copyright (c) 2006 - 2011, Intel Corporation. All rights reserved.<BR>
5 This program and the accompanying materials are licensed and made available under
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7 The full text of the license may be found at
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15 #ifndef __UEFI_GPT_H__
16 #define __UEFI_GPT_H__
18 FILE_LICENCE ( BSD3 );
21 /// The primary GUID Partition Table Header must be
22 /// located in LBA 1 (i.e., the second logical block).
24 #define PRIMARY_PART_HEADER_LBA 1
26 /// EFI Partition Table Signature: "EFI PART".
28 #define EFI_PTAB_HEADER_ID SIGNATURE_64 ('E','F','I',' ','P','A','R','T')
33 /// GPT Partition Table Header.
37 /// The table header for the GPT partition Table.
38 /// This header contains EFI_PTAB_HEADER_ID.
40 EFI_TABLE_HEADER Header;
42 /// The LBA that contains this data structure.
46 /// LBA address of the alternate GUID Partition Table Header.
50 /// The first usable logical block that may be used
51 /// by a partition described by a GUID Partition Entry.
53 EFI_LBA FirstUsableLBA;
55 /// The last usable logical block that may be used
56 /// by a partition described by a GUID Partition Entry.
58 EFI_LBA LastUsableLBA;
60 /// GUID that can be used to uniquely identify the disk.
64 /// The starting LBA of the GUID Partition Entry array.
66 EFI_LBA PartitionEntryLBA;
68 /// The number of Partition Entries in the GUID Partition Entry array.
70 UINT32 NumberOfPartitionEntries;
72 /// The size, in bytes, of each the GUID Partition
73 /// Entry structures in the GUID Partition Entry
74 /// array. This field shall be set to a value of 128 x 2^n where n is
75 /// an integer greater than or equal to zero (e.g., 128, 256, 512, etc.).
77 UINT32 SizeOfPartitionEntry;
79 /// The CRC32 of the GUID Partition Entry array.
80 /// Starts at PartitionEntryLBA and is
81 /// computed over a byte length of
82 /// NumberOfPartitionEntries * SizeOfPartitionEntry.
84 UINT32 PartitionEntryArrayCRC32;
85 } EFI_PARTITION_TABLE_HEADER;
88 /// GPT Partition Entry.
92 /// Unique ID that defines the purpose and type of this Partition. A value of
93 /// zero defines that this partition entry is not being used.
95 EFI_GUID PartitionTypeGUID;
97 /// GUID that is unique for every partition entry. Every partition ever
98 /// created will have a unique GUID.
99 /// This GUID must be assigned when the GUID Partition Entry is created.
101 EFI_GUID UniquePartitionGUID;
103 /// Starting LBA of the partition defined by this entry
107 /// Ending LBA of the partition defined by this entry.
111 /// Attribute bits, all bits reserved by UEFI
112 /// Bit 0: If this bit is set, the partition is required for the platform to function. The owner/creator of the
113 /// partition indicates that deletion or modification of the contents can result in loss of platform
114 /// features or failure for the platform to boot or operate. The system cannot function normally if
115 /// this partition is removed, and it should be considered part of the hardware of the system.
116 /// Actions such as running diagnostics, system recovery, or even OS install or boot, could
117 /// potentially stop working if this partition is removed. Unless OS software or firmware
118 /// recognizes this partition, it should never be removed or modified as the UEFI firmware or
119 /// platform hardware may become non-functional.
120 /// Bit 1: If this bit is set, then firmware must not produce an EFI_BLOCK_IO_PROTOCOL device for
121 /// this partition. By not producing an EFI_BLOCK_IO_PROTOCOL partition, file system
122 /// mappings will not be created for this partition in UEFI.
123 /// Bit 2: This bit is set aside to let systems with traditional PC-AT BIOS firmware implementations
124 /// inform certain limited, special-purpose software running on these systems that a GPT
125 /// partition may be bootable. The UEFI boot manager must ignore this bit when selecting
126 /// a UEFI-compliant application, e.g., an OS loader.
127 /// Bits 3-47: Undefined and must be zero. Reserved for expansion by future versions of the UEFI
129 /// Bits 48-63: Reserved for GUID specific use. The use of these bits will vary depending on the
130 /// PartitionTypeGUID. Only the owner of the PartitionTypeGUID is allowed
131 /// to modify these bits. They must be preserved if Bits 0-47 are modified..
135 /// Null-terminated name of the partition.
137 CHAR16 PartitionName[36];
138 } EFI_PARTITION_ENTRY;