[PATCH 06/13] MdePkg/Library: Add StandaloneMmRuntimeDxe library

[Jagadeesh Ujja <jagadeesh.ujja@arm.com>]

To resuse some the libraries in both MM and non-MM mode, a mechanism to
determine the execution mode is required, i.e, in MM or non-MM. Add a
new library for use by non-MM code to determine the current execution
mode.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Jagadeesh Ujja <jagadeesh.ujja@arm.com>
---
 MdePkg/Include/Library/StandaloneMmRuntimeDxe.h                  | 39 ++++++++++++++++++++
 MdePkg/Library/StandaloneMmRuntimeDxe/StandaloneMmRuntimeDxe.c   | 36 ++++++++++++++++++
 MdePkg/Library/StandaloneMmRuntimeDxe/StandaloneMmRuntimeDxe.inf | 36 ++++++++++++++++++
 MdePkg/MdePkg.dec                                                |  3 ++
 4 files changed, 114 insertions(+)

diff --git a/MdePkg/Include/Library/StandaloneMmRuntimeDxe.h b/MdePkg/Include/Library/StandaloneMmRuntimeDxe.h
new file mode 100644
index 0000000..9c45c4d
--- /dev/null
+++ b/MdePkg/Include/Library/StandaloneMmRuntimeDxe.h
@@ -0,0 +1,39 @@
+/** @file
+  Provides a InMm implementation for RUNTIME DXE drivers
+
+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 __STANDALONE_MM_RUNTIME_DXE_H__
+#define __STANDALONE_MM_RUNTIME_DXE_H__
+
+#include <PiDxe.h>
+
+/**
+  This function allows the caller to determine if the driver is executing in
+  Standalone Management Mode(SMM).
+
+  This function returns TRUE if the driver is executing in SMM and FALSE if the
+  driver is not executing in SMM.
+
+  @retval  TRUE  The driver is executing in Standalone Management Mode (SMM).
+  @retval  FALSE The driver is not executing in Standalone Management Mode (SMM).
+
+**/
+BOOLEAN
+EFIAPI
+InMm (
+  VOID
+  );
+
+#endif
diff --git a/MdePkg/Library/StandaloneMmRuntimeDxe/StandaloneMmRuntimeDxe.c b/MdePkg/Library/StandaloneMmRuntimeDxe/StandaloneMmRuntimeDxe.c
new file mode 100644
index 0000000..61ef59a
--- /dev/null
+++ b/MdePkg/Library/StandaloneMmRuntimeDxe/StandaloneMmRuntimeDxe.c
@@ -0,0 +1,36 @@
+/** @file
+  StandaloneMmRuntimeDxe Library.
+
+  Copyright (c) 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.
+
+**/
+
+#include <PiDxe.h>
+
+/**
+  This function allows the caller to determine if the driver is executing in
+  Standalone Management Mode(SMM).
+
+  This function returns TRUE if the driver is executing in SMM and FALSE if the
+  driver is not executing in SMM.
+
+  @retval  TRUE  The driver is executing in Standalone Management Mode (SMM).
+  @retval  FALSE The driver is not executing in Standalone Management Mode (SMM).
+
+**/
+BOOLEAN
+EFIAPI
+InMm (
+  VOID
+  )
+{
+  return FALSE;
+}
diff --git a/MdePkg/Library/StandaloneMmRuntimeDxe/StandaloneMmRuntimeDxe.inf b/MdePkg/Library/StandaloneMmRuntimeDxe/StandaloneMmRuntimeDxe.inf
new file mode 100644
index 0000000..43f5f26
--- /dev/null
+++ b/MdePkg/Library/StandaloneMmRuntimeDxe/StandaloneMmRuntimeDxe.inf
@@ -0,0 +1,36 @@
+## @file
+#  Provides StandaloneMmRuntimeDxe.
+#
+#  Copyright (c) 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.
+#
+##
+
+[Defines]
+  INF_VERSION                    = 0x00010005
+  BASE_NAME                      = StandaloneMmRuntimeDxe
+  FILE_GUID                      = 8099cfbf-9564-4c9b-9052-e66b1da88930
+  MODULE_TYPE                    = DXE_RUNTIME_DRIVER
+  VERSION_STRING                 = 1.0
+  LIBRARY_CLASS                  = StandaloneMmRuntimeDxe |DXE_RUNTIME_DRIVER DXE_SMM_DRIVER MM_STANDALONE
+
+#
+# The following information is for reference only and not required by the build tools.
+#
+#  VALID_ARCHITECTURES           = IA32 X64 AARCH64
+#
+
+[Sources]
+  StandaloneMmRuntimeDxe.c
+
+[Packages]
+  MdePkg/MdePkg.dec
+
diff --git a/MdePkg/MdePkg.dec b/MdePkg/MdePkg.dec
index 17c90c2..0c2ebf5 100644
--- a/MdePkg/MdePkg.dec
+++ b/MdePkg/MdePkg.dec
@@ -247,6 +247,9 @@
   #                 Only available to MM_STANDALONE module types.
   MmServicesTableLib|Include/Library/StandaloneMmServicesTableLib.h
 
+  ## @libraryclass  Provides services to RUNTIME DXE drivers to determine execution mode
+  StandaloneMmRuntimeDxe|Include/Library/StandaloneMmRuntimeDxe.h
+
 [LibraryClasses.IA32, LibraryClasses.X64]
   ##  @libraryclass  Abstracts both S/W SMI generation and detection.
   ##
-- 
2.7.4