2 EFI Guid Partition Table Format Definition.
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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__
19 /// The primary GUID Partition Table Header must be
20 /// located in LBA 1 (i.e., the second logical block).
22 #define PRIMARY_PART_HEADER_LBA 1
24 /// EFI Partition Table Signature: "EFI PART".
26 #define EFI_PTAB_HEADER_ID SIGNATURE_64 ('E','F','I',' ','P','A','R','T')
31 /// GPT Partition Table Header.
35 /// The table header for the GPT partition Table.
36 /// This header contains EFI_PTAB_HEADER_ID.
38 EFI_TABLE_HEADER Header
;
40 /// The LBA that contains this data structure.
44 /// LBA address of the alternate GUID Partition Table Header.
48 /// The first usable logical block that may be used
49 /// by a partition described by a GUID Partition Entry.
51 EFI_LBA FirstUsableLBA
;
53 /// The last usable logical block that may be used
54 /// by a partition described by a GUID Partition Entry.
56 EFI_LBA LastUsableLBA
;
58 /// GUID that can be used to uniquely identify the disk.
62 /// The starting LBA of the GUID Partition Entry array.
64 EFI_LBA PartitionEntryLBA
;
66 /// The number of Partition Entries in the GUID Partition Entry array.
68 UINT32 NumberOfPartitionEntries
;
70 /// The size, in bytes, of each the GUID Partition
71 /// Entry structures in the GUID Partition Entry
72 /// array. This field shall be set to a value of 128 x 2^n where n is
73 /// an integer greater than or equal to zero (e.g., 128, 256, 512, etc.).
75 UINT32 SizeOfPartitionEntry
;
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.
82 UINT32 PartitionEntryArrayCRC32
;
83 } EFI_PARTITION_TABLE_HEADER
;
86 /// GPT Partition Entry.
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.
93 EFI_GUID PartitionTypeGUID
;
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.
99 EFI_GUID UniquePartitionGUID
;
101 /// Starting LBA of the partition defined by this entry
105 /// Ending LBA of the partition defined by this entry.
109 /// Attribute bits, all bits reserved by UEFI
110 /// Bit 0: If this bit is set, the partition is required for the platform to function. The owner/creator of the
111 /// partition indicates that deletion or modification of the contents can result in loss of platform
112 /// features or failure for the platform to boot or operate. The system cannot function normally if
113 /// this partition is removed, and it should be considered part of the hardware of the system.
114 /// Actions such as running diagnostics, system recovery, or even OS install or boot, could
115 /// potentially stop working if this partition is removed. Unless OS software or firmware
116 /// recognizes this partition, it should never be removed or modified as the UEFI firmware or
117 /// platform hardware may become non-functional.
118 /// Bit 1: If this bit is set, then firmware must not produce an EFI_BLOCK_IO_PROTOCOL device for
119 /// this partition. By not producing an EFI_BLOCK_IO_PROTOCOL partition, file system
120 /// mappings will not be created for this partition in UEFI.
121 /// Bit 2: This bit is set aside to let systems with traditional PC-AT BIOS firmware implementations
122 /// inform certain limited, special-purpose software running on these systems that a GPT
123 /// partition may be bootable. The UEFI boot manager must ignore this bit when selecting
124 /// a UEFI-compliant application, e.g., an OS loader.
125 /// Bits 3-47: Undefined and must be zero. Reserved for expansion by future versions of the UEFI
127 /// Bits 48-63: Reserved for GUID specific use. The use of these bits will vary depending on the
128 /// PartitionTypeGUID. Only the owner of the PartitionTypeGUID is allowed
129 /// to modify these bits. They must be preserved if Bits 0-47 are modified..
133 /// Null-terminated name of the partition.
135 CHAR16 PartitionName
[36];
136 } EFI_PARTITION_ENTRY
;