1 /** @file 2 EFI Guid Partition Table Format Definition. 3 4 Copyright (c) 2006 - 2011, Intel Corporation. All rights reserved.<BR> 5 This program and the accompanying materials are licensed and made available under 6 the terms and conditions of the BSD License that accompanies this distribution. 7 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 /// EFI Partition Table Signature: "EFI PART". 25 /// 26 #define EFI_PTAB_HEADER_ID SIGNATURE_64 ('E','F','I',' ','P','A','R','T') 27 28 #pragma pack(1) 29 30 /// 31 /// GPT Partition Table Header. 32 /// 33 typedef struct { 34 /// 35 /// The table header for the GPT partition Table. 36 /// This header contains EFI_PTAB_HEADER_ID. 37 /// 38 EFI_TABLE_HEADER Header; 39 /// 40 /// The LBA that contains this data structure. 41 /// 42 EFI_LBA MyLBA; 43 /// 44 /// LBA address of the alternate GUID Partition Table Header. 45 /// 46 EFI_LBA AlternateLBA; 47 /// 48 /// The first usable logical block that may be used 49 /// by a partition described by a GUID Partition Entry. 50 /// 51 EFI_LBA FirstUsableLBA; 52 /// 53 /// The last usable logical block that may be used 54 /// by a partition described by a GUID Partition Entry. 55 /// 56 EFI_LBA LastUsableLBA; 57 /// 58 /// GUID that can be used to uniquely identify the disk. 59 /// 60 EFI_GUID DiskGUID; 61 /// 62 /// The starting LBA of the GUID Partition Entry array. 63 /// 64 EFI_LBA PartitionEntryLBA; 65 /// 66 /// The number of Partition Entries in the GUID Partition Entry array. 67 /// 68 UINT32 NumberOfPartitionEntries; 69 /// 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.). 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: 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 126 /// specification. 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.. 130 /// 131 UINT64 Attributes; 132 /// 133 /// Null-terminated name of the partition. 134 /// 135 CHAR16 PartitionName[36]; 136 } EFI_PARTITION_ENTRY; 137 138 #pragma pack() 139 #endif 140 141 142