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/** @file
Block Translation Table (BTT) metadata layout definition.
BTT is a layout and set of rules for doing block I/O that provide powerfail
write atomicity of a single block.
Copyright (c) 2017, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
@par Revision Reference:
This metadata layout definition was introduced in UEFI Specification 2.7.
**/
#ifndef _BTT_H_
#define _BTT_H_
///
/// The BTT layout and behavior is described by the GUID as below.
///
#define EFI_BTT_ABSTRACTION_GUID \
{ \
0x18633bfc, 0x1735, 0x4217, { 0x8a, 0xc9, 0x17, 0x23, 0x92, 0x82, 0xd3, 0xf8 } \
}
//
// Alignment of all BTT structures
//
#define EFI_BTT_ALIGNMENT 4096
#define EFI_BTT_INFO_UNUSED_LEN 3968
#define EFI_BTT_INFO_BLOCK_SIG_LEN 16
///
/// Indicate inconsistent metadata or lost metadata due to unrecoverable media errors.
///
#define EFI_BTT_INFO_BLOCK_FLAGS_ERROR 0x00000001
#define EFI_BTT_INFO_BLOCK_MAJOR_VERSION 2
#define EFI_BTT_INFO_BLOCK_MINOR_VERSION 0
///
/// Block Translation Table (BTT) Info Block
///
typedef struct _EFI_BTT_INFO_BLOCK {
///
/// Signature of the BTT Index Block data structure.
/// Shall be "BTT_ARENA_INFO\0\0".
///
CHAR8 Sig[EFI_BTT_INFO_BLOCK_SIG_LEN];
///
/// UUID identifying this BTT instance.
///
GUID Uuid;
///
/// UUID of containing namespace.
///
GUID ParentUuid;
///
/// Attributes of this BTT Info Block.
///
UINT32 Flags;
///
/// Major version number. Currently at version 2.
///
UINT16 Major;
///
/// Minor version number. Currently at version 0.
///
UINT16 Minor;
///
/// Advertised LBA size in bytes. I/O requests shall be in this size chunk.
///
UINT32 ExternalLbaSize;
///
/// Advertised number of LBAs in this arena.
///
UINT32 ExternalNLba;
///
/// Internal LBA size shall be greater than or equal to ExternalLbaSize and shall not be smaller than 512 bytes.
///
UINT32 InternalLbaSize;
///
/// Number of internal blocks in the arena data area.
///
UINT32 InternalNLba;
///
/// Number of free blocks maintained for writes to this arena.
///
UINT32 NFree;
///
/// The size of this info block in bytes.
///
UINT32 InfoSize;
///
/// Offset of next arena, relative to the beginning of this arena.
///
UINT64 NextOff;
///
/// Offset of the data area for this arena, relative to the beginning of this arena.
///
UINT64 DataOff;
///
/// Offset of the map for this arena, relative to the beginning of this arena.
///
UINT64 MapOff;
///
/// Offset of the flog for this arena, relative to the beginning of this arena.
///
UINT64 FlogOff;
///
/// Offset of the backup copy of this arena's info block, relative to the beginning of this arena.
///
UINT64 InfoOff;
///
/// Shall be zero.
///
CHAR8 Unused[EFI_BTT_INFO_UNUSED_LEN];
///
/// 64-bit Fletcher64 checksum of all fields.
///
UINT64 Checksum;
} EFI_BTT_INFO_BLOCK;
///
/// BTT Map entry maps an LBA that indexes into the arena, to its actual location.
///
typedef struct _EFI_BTT_MAP_ENTRY {
///
/// Post-map LBA number (block number in this arena's data area)
///
UINT32 PostMapLba : 30;
///
/// When set and Zero is not set, reads on this block return an error.
/// When set and Zero is set, indicate a map entry in its normal, non-error state.
///
UINT32 Error : 1;
///
/// When set and Error is not set, reads on this block return a full block of zeros.
/// When set and Error is set, indicate a map entry in its normal, non-error state.
///
UINT32 Zero : 1;
} EFI_BTT_MAP_ENTRY;
///
/// Alignment of each flog structure
///
#define EFI_BTT_FLOG_ENTRY_ALIGNMENT 64
///
/// The BTT Flog is both a free list and a log.
/// The Flog size is determined by the EFI_BTT_INFO_BLOCK.NFree which determines how many of these flog
/// entries there are.
/// The Flog location is the highest aligned address in the arena after space for the backup info block.
///
typedef struct _EFI_BTT_FLOG {
///
/// Last pre-map LBA written using this flog entry.
///
UINT32 Lba0;
///
/// Old post-map LBA.
///
UINT32 OldMap0;
///
/// New post-map LBA.
///
UINT32 NewMap0;
///
/// The Seq0 field in each flog entry is used to determine which set of fields is newer between the two sets
/// (Lba0, OldMap0, NewMpa0, Seq0 vs Lba1, Oldmap1, NewMap1, Seq1).
///
UINT32 Seq0;
///
/// Alternate lba entry.
///
UINT32 Lba1;
///
/// Alternate old entry.
///
UINT32 OldMap1;
///
/// Alternate new entry.
///
UINT32 NewMap1;
///
/// Alternate Seq entry.
///
UINT32 Seq1;
} EFI_BTT_FLOG;
extern GUID gEfiBttAbstractionGuid;
#endif //_BTT_H_
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