BTT definitions are defined in UEFI spec 2.7, to defines
a layout and set of rules for doing block I/O that provide
powerfail write atomicity of a single block in NVDIMM.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Ruiyu Ni <ruiyu.ni@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
---
 MdePkg/Include/Guid/Btt.h | 228 ++++++++++++++++++++++++++++++++++++++++++++++
 MdePkg/MdePkg.dec         |   6 ++
 2 files changed, 234 insertions(+)
 create mode 100644 MdePkg/Include/Guid/Btt.h

diff --git a/MdePkg/Include/Guid/Btt.h b/MdePkg/Include/Guid/Btt.h
new file mode 100644
index 0000000000..92977259a4
--- /dev/null
+++ b/MdePkg/Include/Guid/Btt.h
@@ -0,0 +1,228 @@
+/** @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>
+This program and the accompanying materials are licensed and made available under
+the terms and conditions of the BSD License that accompanies this distribution.
+The full text of the license may be found at
+http://opensource.org/licenses/bsd-license.php.
+
+THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+  @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_
diff --git a/MdePkg/MdePkg.dec b/MdePkg/MdePkg.dec
index 1867c54c3b..c5279298e8 100644
--- a/MdePkg/MdePkg.dec
+++ b/MdePkg/MdePkg.dec
@@ -646,6 +646,12 @@ [Guids]
   gEfiHiiImageDecoderNamePngGuid            = { 0xaf060190, 0x5e3a, 0x4025, { 0xaf, 0xbd, 0xe1, 0xf9, 0x05, 0xbf, 0xaa, 0x4c }}
 
   #
+  # GUIDs defined in UEFI2.7
+  #
+  ## Include/Guid/Btt.h
+  gEfiBttAbstractionGuid         = { 0x18633bfc, 0x1735, 0x4217, { 0x8a, 0xc9, 0x17, 0x23, 0x92, 0x82, 0xd3, 0xf8 }}
+
+  #
   # GUID defined in PI1.0
   #
   ## Include/Guid/AprioriFileName.h
-- 
2.12.2.windows.2

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