1 /** @file 2 EFI Guid Partition Table Format Definition. 3 4 Copyright (c) 2006 - 2019, Intel Corporation. All rights reserved.<BR> 5 SPDX-License-Identifier: BSD-2-Clause-Patent 6 7 **/ 8 9 #ifndef __UEFI_GPT_H__ 10 #define __UEFI_GPT_H__ 11 12 /// 13 /// The primary GUID Partition Table Header must be 14 /// located in LBA 1 (i.e., the second logical block). 15 /// 16 #define PRIMARY_PART_HEADER_LBA 1 17 /// 18 /// EFI Partition Table Signature: "EFI PART". 19 /// 20 #define EFI_PTAB_HEADER_ID SIGNATURE_64 ('E','F','I',' ','P','A','R','T') 21 /// 22 /// Minimum bytes reserve for EFI entry array buffer. 23 /// 24 #define EFI_GPT_PART_ENTRY_MIN_SIZE 16384 25 26 #pragma pack(1) 27 28 /// 29 /// GPT Partition Table Header. 30 /// 31 typedef struct { 32 /// 33 /// The table header for the GPT partition Table. 34 /// This header contains EFI_PTAB_HEADER_ID. 35 /// 36 EFI_TABLE_HEADER Header; 37 /// 38 /// The LBA that contains this data structure. 39 /// 40 EFI_LBA MyLBA; 41 /// 42 /// LBA address of the alternate GUID Partition Table Header. 43 /// 44 EFI_LBA AlternateLBA; 45 /// 46 /// The first usable logical block that may be used 47 /// by a partition described by a GUID Partition Entry. 48 /// 49 EFI_LBA FirstUsableLBA; 50 /// 51 /// The last usable logical block that may be used 52 /// by a partition described by a GUID Partition Entry. 53 /// 54 EFI_LBA LastUsableLBA; 55 /// 56 /// GUID that can be used to uniquely identify the disk. 57 /// 58 EFI_GUID DiskGUID; 59 /// 60 /// The starting LBA of the GUID Partition Entry array. 61 /// 62 EFI_LBA PartitionEntryLBA; 63 /// 64 /// The number of Partition Entries in the GUID Partition Entry array. 65 /// 66 UINT32 NumberOfPartitionEntries; 67 /// 68 /// The size, in bytes, of each the GUID Partition 69 /// Entry structures in the GUID Partition Entry 70 /// array. This field shall be set to a value of 128 x 2^n where n is 71 /// an integer greater than or equal to zero (e.g., 128, 256, 512, etc.). 72 /// 73 UINT32 SizeOfPartitionEntry; 74 /// 75 /// The CRC32 of the GUID Partition Entry array. 76 /// Starts at PartitionEntryLBA and is 77 /// computed over a byte length of 78 /// NumberOfPartitionEntries * SizeOfPartitionEntry. 79 /// 80 UINT32 PartitionEntryArrayCRC32; 81 } EFI_PARTITION_TABLE_HEADER; 82 83 /// 84 /// GPT Partition Entry. 85 /// 86 typedef struct { 87 /// 88 /// Unique ID that defines the purpose and type of this Partition. A value of 89 /// zero defines that this partition entry is not being used. 90 /// 91 EFI_GUID PartitionTypeGUID; 92 /// 93 /// GUID that is unique for every partition entry. Every partition ever 94 /// created will have a unique GUID. 95 /// This GUID must be assigned when the GUID Partition Entry is created. 96 /// 97 EFI_GUID UniquePartitionGUID; 98 /// 99 /// Starting LBA of the partition defined by this entry 100 /// 101 EFI_LBA StartingLBA; 102 /// 103 /// Ending LBA of the partition defined by this entry. 104 /// 105 EFI_LBA EndingLBA; 106 /// 107 /// Attribute bits, all bits reserved by UEFI 108 /// Bit 0: If this bit is set, the partition is required for the platform to function. The owner/creator of the 109 /// partition indicates that deletion or modification of the contents can result in loss of platform 110 /// features or failure for the platform to boot or operate. The system cannot function normally if 111 /// this partition is removed, and it should be considered part of the hardware of the system. 112 /// Actions such as running diagnostics, system recovery, or even OS install or boot, could 113 /// potentially stop working if this partition is removed. Unless OS software or firmware 114 /// recognizes this partition, it should never be removed or modified as the UEFI firmware or 115 /// platform hardware may become non-functional. 116 /// Bit 1: If this bit is set, then firmware must not produce an EFI_BLOCK_IO_PROTOCOL device for 117 /// this partition. By not producing an EFI_BLOCK_IO_PROTOCOL partition, file system 118 /// mappings will not be created for this partition in UEFI. 119 /// Bit 2: This bit is set aside to let systems with traditional PC-AT BIOS firmware implementations 120 /// inform certain limited, special-purpose software running on these systems that a GPT 121 /// partition may be bootable. The UEFI boot manager must ignore this bit when selecting 122 /// a UEFI-compliant application, e.g., an OS loader. 123 /// Bits 3-47: Undefined and must be zero. Reserved for expansion by future versions of the UEFI 124 /// specification. 125 /// Bits 48-63: Reserved for GUID specific use. The use of these bits will vary depending on the 126 /// PartitionTypeGUID. Only the owner of the PartitionTypeGUID is allowed 127 /// to modify these bits. They must be preserved if Bits 0-47 are modified.. 128 /// 129 UINT64 Attributes; 130 /// 131 /// Null-terminated name of the partition. 132 /// 133 CHAR16 PartitionName[36]; 134 } EFI_PARTITION_ENTRY; 135 136 #pragma pack() 137 #endif 138