[PATCH 2/4] MdePkg: Import MmServicesTableLib library.

["Marvin Häuser" <Marvin.Haeuser@outlook.com>]

Implements the MmServicesTableLib library class.
The code was derieved from SmmServicesTableLib.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Marvin Haeuser <Marvin.Haeuser@outlook.com>
---
 MdePkg/Library/MmServicesTableLib/MmServicesTableLib.c   | 85 ++++++++++++++++++++
 MdePkg/Library/MmServicesTableLib/MmServicesTableLib.inf | 41 ++++++++++
 MdePkg/Library/MmServicesTableLib/MmServicesTableLib.uni | 21 +++++
 MdePkg/MdePkg.dsc                                        |  1 +
 4 files changed, 148 insertions(+)

diff --git a/MdePkg/Library/MmServicesTableLib/MmServicesTableLib.c b/MdePkg/Library/MmServicesTableLib/MmServicesTableLib.c
new file mode 100644
index 000000000000..1ecbb044162d
--- /dev/null
+++ b/MdePkg/Library/MmServicesTableLib/MmServicesTableLib.c
@@ -0,0 +1,85 @@
+/** @file
+  MM Services Table Library.
+
+  Copyright (c) 2009 - 2018, 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
+  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 <PiMm.h>
+#include <Protocol/MmBase.h>
+#include <Library/MmServicesTableLib.h>
+#include <Library/DebugLib.h>
+
+EFI_MM_SYSTEM_TABLE *gMmst = NULL;
+
+/**
+  The constructor function caches the pointer of MM Services Table.
+
+  @param  ImageHandle   The firmware allocated handle for the EFI image.
+  @param  SystemTable   A pointer to the EFI System Table.
+
+  @retval EFI_SUCCESS   The constructor always returns EFI_SUCCESS.
+
+**/
+EFI_STATUS
+EFIAPI
+MmServicesTableLibConstructor (
+  IN EFI_HANDLE        ImageHandle,
+  IN EFI_SYSTEM_TABLE  *SystemTable
+  )
+{
+  EFI_STATUS           Status;
+  EFI_MM_BASE_PROTOCOL *InternalMmBase;
+
+  InternalMmBase = NULL;
+  //
+  // Retrieve MM Base Protocol,  Do not use gBS from UefiBootServicesTableLib on purpose
+  // to prevent inclusion of gBS, gST, and gImageHandle from MM Drivers unless the
+  // MM driver explicity declares that dependency.
+  //
+  Status = SystemTable->BootServices->LocateProtocol (
+                                        &gEfiMmBaseProtocolGuid,
+                                        NULL,
+                                        (VOID **)&InternalMmBase
+                                        );
+  ASSERT_EFI_ERROR (Status);
+  ASSERT (InternalMmBase != NULL);
+
+  //
+  // We are in MM, retrieve the pointer to MM System Table
+  //
+  InternalMmBase->GetMmstLocation (InternalMmBase, &gMmst);
+  ASSERT (gMmst != NULL);
+
+  return EFI_SUCCESS;
+}
+
+/**
+  This function allows the caller to determine if the driver is executing in
+  Management Mode(MM).
+
+  This function returns TRUE if the driver is executing in MM and FALSE if the
+  driver is not executing in MM.
+
+  @retval  TRUE  The driver is executing in Management Mode (MM).
+  @retval  FALSE The driver is not executing in Management Mode (MM).
+
+**/
+BOOLEAN
+EFIAPI
+InMm (
+  VOID
+  )
+{
+  //
+  // We are already in MM
+  //
+  return TRUE;
+}
diff --git a/MdePkg/Library/MmServicesTableLib/MmServicesTableLib.inf b/MdePkg/Library/MmServicesTableLib/MmServicesTableLib.inf
new file mode 100644
index 000000000000..fd6b2cbe1f94
--- /dev/null
+++ b/MdePkg/Library/MmServicesTableLib/MmServicesTableLib.inf
@@ -0,0 +1,41 @@
+## @file
+# MM Services Table Library.
+#
+# Copyright (c) 2009 - 2014, 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
+#  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                      = MmServicesTableLib
+  MODULE_UNI_FILE                = MmServicesTableLib.uni
+  FILE_GUID                      = 319D85EE-D290-4B26-BBDA-9D43CF35DF60
+  MODULE_TYPE                    = DXE_SMM_DRIVER
+  VERSION_STRING                 = 1.0
+  LIBRARY_CLASS                  = MmServicesTableLib|DXE_SMM_DRIVER
+  PI_SPECIFICATION_VERSION       = 0x0001000A
+  CONSTRUCTOR                    = MmServicesTableLibConstructor
+
+[Sources]
+  MmServicesTableLib.c
+
+[Packages]
+  MdePkg/MdePkg.dec
+
+[LibraryClasses]
+  DebugLib
+
+[Protocols]
+  gEfiMmBaseProtocolGuid  ## CONSUMES
+
+[Depex]
+  gEfiMmBaseProtocolGuid
+
diff --git a/MdePkg/Library/MmServicesTableLib/MmServicesTableLib.uni b/MdePkg/Library/MmServicesTableLib/MmServicesTableLib.uni
new file mode 100644
index 000000000000..5194cd829051
--- /dev/null
+++ b/MdePkg/Library/MmServicesTableLib/MmServicesTableLib.uni
@@ -0,0 +1,21 @@
+// /** @file
+// MM Services Table Library.
+//
+// MM Services Table Library.
+//
+// Copyright (c) 2009 - 2014, 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
+// 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.
+//
+// **/
+
+
+#string STR_MODULE_ABSTRACT             #language en-US "MM Services Table Library"
+
+#string STR_MODULE_DESCRIPTION          #language en-US "MM Services Table Library."
+
diff --git a/MdePkg/MdePkg.dsc b/MdePkg/MdePkg.dsc
index c7b93d4c8c44..7903638f8dad 100644
--- a/MdePkg/MdePkg.dsc
+++ b/MdePkg/MdePkg.dsc
@@ -151,6 +151,7 @@ [Components.IA32, Components.X64]
   MdePkg/Library/SmmIoLibSmmCpuIo2/SmmIoLibSmmCpuIo2.inf
   MdePkg/Library/SmmPciLibPciRootBridgeIo/SmmPciLibPciRootBridgeIo.inf
   MdePkg/Library/SmmServicesTableLib/SmmServicesTableLib.inf
+  MdePkg/Library/MmServicesTableLib/MmServicesTableLib.inf
   MdePkg/Library/SmmMemoryAllocationLib/SmmMemoryAllocationLib.inf
   MdePkg/Library/SmmPeriodicSmiLib/SmmPeriodicSmiLib.inf
   MdePkg/Library/BaseS3BootScriptLibNull/BaseS3BootScriptLibNull.inf
-- 
2.18.0.windows.1