FreeBSD/Linux Kernel Cross Reference
sys/contrib/edk2/Include/Uefi/UefiGpt.h

     /** @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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