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/** @file
EFI Guid Partition Table Format Definition.
Copyright (c) 2006 - 2019, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#ifndef __UEFI_GPT_H__
#define __UEFI_GPT_H__
///
/// The primary GUID Partition Table Header must be
/// located in LBA 1 (i.e., the second logical block).
///
#define PRIMARY_PART_HEADER_LBA 1
///
/// EFI Partition Table Signature: "EFI PART".
///
#define EFI_PTAB_HEADER_ID SIGNATURE_64 ('E','F','I',' ','P','A','R','T')
///
/// Minimum bytes reserve for EFI entry array buffer.
///
#define EFI_GPT_PART_ENTRY_MIN_SIZE 16384
#pragma pack(1)
///
/// GPT Partition Table Header.
///
typedef struct {
///
/// The table header for the GPT partition Table.
/// This header contains EFI_PTAB_HEADER_ID.
///
EFI_TABLE_HEADER Header;
///
/// The LBA that contains this data structure.
///
EFI_LBA MyLBA;
///
/// LBA address of the alternate GUID Partition Table Header.
///
EFI_LBA AlternateLBA;
///
/// The first usable logical block that may be used
/// by a partition described by a GUID Partition Entry.
///
EFI_LBA FirstUsableLBA;
///
/// The last usable logical block that may be used
/// by a partition described by a GUID Partition Entry.
///
EFI_LBA LastUsableLBA;
///
/// GUID that can be used to uniquely identify the disk.
///
EFI_GUID DiskGUID;
///
/// The starting LBA of the GUID Partition Entry array.
///
EFI_LBA PartitionEntryLBA;
///
/// The number of Partition Entries in the GUID Partition Entry array.
///
UINT32 NumberOfPartitionEntries;
///
/// The size, in bytes, of each the GUID Partition
/// Entry structures in the GUID Partition Entry
/// array. This field shall be set to a value of 128 x 2^n where n is
/// an integer greater than or equal to zero (e.g., 128, 256, 512, etc.).
///
UINT32 SizeOfPartitionEntry;
///
/// The CRC32 of the GUID Partition Entry array.
/// Starts at PartitionEntryLBA and is
/// computed over a byte length of
/// NumberOfPartitionEntries * SizeOfPartitionEntry.
///
UINT32 PartitionEntryArrayCRC32;
} EFI_PARTITION_TABLE_HEADER;
///
/// GPT Partition Entry.
///
typedef struct {
///
/// Unique ID that defines the purpose and type of this Partition. A value of
/// zero defines that this partition entry is not being used.
///
EFI_GUID PartitionTypeGUID;
///
/// GUID that is unique for every partition entry. Every partition ever
/// created will have a unique GUID.
/// This GUID must be assigned when the GUID Partition Entry is created.
///
EFI_GUID UniquePartitionGUID;
///
/// Starting LBA of the partition defined by this entry
///
EFI_LBA StartingLBA;
///
/// Ending LBA of the partition defined by this entry.
///
EFI_LBA EndingLBA;
///
/// Attribute bits, all bits reserved by UEFI
/// Bit 0: If this bit is set, the partition is required for the platform to function. The owner/creator of the
/// partition indicates that deletion or modification of the contents can result in loss of platform
/// features or failure for the platform to boot or operate. The system cannot function normally if
/// this partition is removed, and it should be considered part of the hardware of the system.
/// Actions such as running diagnostics, system recovery, or even OS install or boot, could
/// potentially stop working if this partition is removed. Unless OS software or firmware
/// recognizes this partition, it should never be removed or modified as the UEFI firmware or
/// platform hardware may become non-functional.
/// Bit 1: If this bit is set, then firmware must not produce an EFI_BLOCK_IO_PROTOCOL device for
/// this partition. By not producing an EFI_BLOCK_IO_PROTOCOL partition, file system
/// mappings will not be created for this partition in UEFI.
/// Bit 2: This bit is set aside to let systems with traditional PC-AT BIOS firmware implementations
/// inform certain limited, special-purpose software running on these systems that a GPT
/// partition may be bootable. The UEFI boot manager must ignore this bit when selecting
/// a UEFI-compliant application, e.g., an OS loader.
/// Bits 3-47: Undefined and must be zero. Reserved for expansion by future versions of the UEFI
/// specification.
/// Bits 48-63: Reserved for GUID specific use. The use of these bits will vary depending on the
/// PartitionTypeGUID. Only the owner of the PartitionTypeGUID is allowed
/// to modify these bits. They must be preserved if Bits 0-47 are modified..
///
UINT64 Attributes;
///
/// Null-terminated name of the partition.
///
CHAR16 PartitionName[36];
} EFI_PARTITION_ENTRY;
#pragma pack()
#endif
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