Ronak Kanabar | 1ae366f | 2023-06-07 01:21:56 +0530 | [diff] [blame^] | 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 |