[PATCH 1/6] MdePkg/Include: add MmServicesTableLib header file

[Ard Biesheuvel <ard.biesheuvel@linaro.org>]

From: Jagadeesh Ujja <jagadeesh.ujja@arm.com>

SMM has been rebranded as MM, and can be implemented in traditional
mode or standalone mode, using the same prototype for the services
table. Expose this table via MmServicesTableLib, permitting the
respective implementations to expose a traditional or standalone
version.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Jagadeesh Ujja <jagadeesh.ujja@arm.com>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
---
 MdePkg/Include/Library/MmServicesTableLib.h | 25 ++++++++++++++++++++
 MdePkg/MdePkg.dec                           |  4 ++++
 2 files changed, 29 insertions(+)

diff --git a/MdePkg/Include/Library/MmServicesTableLib.h b/MdePkg/Include/Library/MmServicesTableLib.h
new file mode 100644
index 000000000000..12bd01e98641
--- /dev/null
+++ b/MdePkg/Include/Library/MmServicesTableLib.h
@@ -0,0 +1,25 @@
+/** @file
+  Provides a service to retrieve a pointer to the Standalone MM Services Table.
+  Only available to Standalone MM module types.
+
+Copyright (c) 2009 - 2018, Intel Corporation. All rights reserved.<BR>
+Copyright (c) 2016 - 2018, ARM Limited. All rights reserved.<BR>
+
+This program and the accompanying materials
+are licensed and made available under the terms and conditions of the BSD License
+which 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.
+
+**/
+
+#ifndef __MM_SERVICES_TABLE_LIB_H__
+#define __MM_SERVICES_TABLE_LIB_H__
+
+#include <PiMm.h>
+
+extern EFI_MM_SYSTEM_TABLE         *gMmst;
+
+#endif
diff --git a/MdePkg/MdePkg.dec b/MdePkg/MdePkg.dec
index 712bd46dd3d3..a7383b6daafb 100644
--- a/MdePkg/MdePkg.dec
+++ b/MdePkg/MdePkg.dec
@@ -243,6 +243,10 @@ [LibraryClasses]
   ##
   SafeIntLib|Include/Library/SafeIntLib.h
 
+  ## @libraryclass Provides a service to retrieve a pointer to the Standalone MM Services Table.
+  #                Only available to MM_STANDALONE, SMM/DXE Combined and SMM module types.
+  MmServicesTableLib|Include/Library/MmServicesTableLib.h
+
 [LibraryClasses.IA32, LibraryClasses.X64]
   ##  @libraryclass  Abstracts both S/W SMI generation and detection.
   ##
-- 
2.17.1