mirror of https://github.com/acidanthera/audk.git
142 lines
5.4 KiB
C
142 lines
5.4 KiB
C
/** @file
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EFI Guid Partition Table Format Definition.
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Copyright (c) 2006 - 2011, Intel Corporation. All rights reserved.<BR>
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This program and the accompanying materials are licensed and made available under
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the terms and conditions of the BSD License that accompanies this distribution.
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The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php.
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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#ifndef __UEFI_GPT_H__
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#define __UEFI_GPT_H__
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///
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/// The primary GUID Partition Table Header must be
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/// located in LBA 1 (i.e., the second logical block).
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///
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#define PRIMARY_PART_HEADER_LBA 1
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///
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/// EFI Partition Table Signature: "EFI PART".
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///
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#define EFI_PTAB_HEADER_ID SIGNATURE_64 ('E','F','I',' ','P','A','R','T')
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#pragma pack(1)
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///
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/// GPT Partition Table Header.
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///
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typedef struct {
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///
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/// The table header for the GPT partition Table.
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/// This header contains EFI_PTAB_HEADER_ID.
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///
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EFI_TABLE_HEADER Header;
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///
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/// The LBA that contains this data structure.
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///
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EFI_LBA MyLBA;
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///
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/// LBA address of the alternate GUID Partition Table Header.
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///
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EFI_LBA AlternateLBA;
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///
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/// The first usable logical block that may be used
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/// by a partition described by a GUID Partition Entry.
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///
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EFI_LBA FirstUsableLBA;
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///
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/// The last usable logical block that may be used
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/// by a partition described by a GUID Partition Entry.
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///
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EFI_LBA LastUsableLBA;
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///
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/// GUID that can be used to uniquely identify the disk.
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///
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EFI_GUID DiskGUID;
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///
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/// The starting LBA of the GUID Partition Entry array.
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///
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EFI_LBA PartitionEntryLBA;
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///
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/// The number of Partition Entries in the GUID Partition Entry array.
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///
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UINT32 NumberOfPartitionEntries;
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///
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/// The size, in bytes, of each the GUID Partition
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/// Entry structures in the GUID Partition Entry
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/// array. This field shall be set to a value of 128 x 2^n where n is
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/// an integer greater than or equal to zero (e.g., 128, 256, 512, etc.).
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///
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UINT32 SizeOfPartitionEntry;
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///
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/// The CRC32 of the GUID Partition Entry array.
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/// Starts at PartitionEntryLBA and is
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/// computed over a byte length of
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/// NumberOfPartitionEntries * SizeOfPartitionEntry.
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///
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UINT32 PartitionEntryArrayCRC32;
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} EFI_PARTITION_TABLE_HEADER;
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///
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/// GPT Partition Entry.
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///
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typedef struct {
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///
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/// Unique ID that defines the purpose and type of this Partition. A value of
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/// zero defines that this partition entry is not being used.
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///
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EFI_GUID PartitionTypeGUID;
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///
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/// GUID that is unique for every partition entry. Every partition ever
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/// created will have a unique GUID.
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/// This GUID must be assigned when the GUID Partition Entry is created.
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///
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EFI_GUID UniquePartitionGUID;
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///
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/// Starting LBA of the partition defined by this entry
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///
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EFI_LBA StartingLBA;
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///
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/// Ending LBA of the partition defined by this entry.
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///
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EFI_LBA EndingLBA;
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///
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/// Attribute bits, all bits reserved by UEFI
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/// Bit 0: If this bit is set, the partition is required for the platform to function. The owner/creator of the
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/// partition indicates that deletion or modification of the contents can result in loss of platform
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/// features or failure for the platform to boot or operate. The system cannot function normally if
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/// this partition is removed, and it should be considered part of the hardware of the system.
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/// Actions such as running diagnostics, system recovery, or even OS install or boot, could
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/// potentially stop working if this partition is removed. Unless OS software or firmware
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/// recognizes this partition, it should never be removed or modified as the UEFI firmware or
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/// platform hardware may become non-functional.
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/// Bit 1: If this bit is set, then firmware must not produce an EFI_BLOCK_IO_PROTOCOL device for
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/// this partition. By not producing an EFI_BLOCK_IO_PROTOCOL partition, file system
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/// mappings will not be created for this partition in UEFI.
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/// Bit 2: This bit is set aside to let systems with traditional PC-AT BIOS firmware implementations
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/// inform certain limited, special-purpose software running on these systems that a GPT
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/// partition may be bootable. The UEFI boot manager must ignore this bit when selecting
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/// a UEFI-compliant application, e.g., an OS loader.
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/// Bits 3-47: Undefined and must be zero. Reserved for expansion by future versions of the UEFI
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/// specification.
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/// Bits 48-63: Reserved for GUID specific use. The use of these bits will vary depending on the
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/// PartitionTypeGUID. Only the owner of the PartitionTypeGUID is allowed
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/// to modify these bits. They must be preserved if Bits 0-47 are modified..
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///
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UINT64 Attributes;
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///
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/// Null-terminated name of the partition.
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///
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CHAR16 PartitionName[36];
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} EFI_PARTITION_ENTRY;
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#pragma pack()
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#endif
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