2 files changed, 65 insertions, 0 deletions
diff --git a/MdePkg/Include/Ppi/MmConfiguration.h b/MdePkg/Include/Ppi/MmConfiguration.h
new file mode 100644
index 0000000..862a80e
--- /dev/null
+++ b/MdePkg/Include/Ppi/MmConfiguration.h
@@ -0,0 +1,62 @@
+/** @file
+  EFI MM Configuration PPI as defined in PI 1.5 specification.
+
+  This PPI is used to:
+  1) report the portions of MMRAM regions which cannot be used for the MMRAM heap.
+  2) register the MM Foundation entry point with the processor code. The entry
+     point will be invoked by the MM processor entry code.
+
+  Copyright (c) Microsoft Corporation.
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#ifndef MM_CONFIGURATION_PPI_H_
+#define MM_CONFIGURATION_PPI_H_
+
+#include <Pi/PiMultiPhase.h>
+
+#define EFI_PEI_MM_CONFIGURATION_PPI_GUID \
+  { \
+    0xc109319, 0xc149, 0x450e, { 0xa3, 0xe3, 0xb9, 0xba, 0xdd, 0x9d, 0xc3, 0xa4 }  \
+  }
+
+typedef struct _EFI_PEI_MM_CONFIGURATION_PPI  EFI_PEI_MM_CONFIGURATION_PPI;
+
+/**
+  This function registers the MM Foundation entry point with the processor code. This entry point will be
+  invoked by the MM Processor entry code as defined in PI specification.
+
+  @param[in]  This            The EFI_PEI_MM_CONFIGURATION_PPI instance.
+  @param[in]  MmEntryPoint    MM Foundation entry point.
+
+  @retval EFI_SUCCESS         The entry-point was successfully registered.
+
+**/
+typedef
+EFI_STATUS
+(EFIAPI *EFI_PEI_MM_REGISTER_MM_ENTRY) (
+  IN CONST EFI_PEI_MM_CONFIGURATION_PPI *This,
+  IN EFI_MM_ENTRY_POINT                 MmEntryPoint
+  );
+
+///
+/// This PPI is a PPI published by a CPU PEIM to indicate which areas within MMRAM are reserved for use by
+/// the CPU for any purpose, such as stack, save state or MM entry point. If a platform chooses to let a CPU
+/// PEIM do MMRAM relocation, this PPI must be produced by this CPU PEIM.
+///
+/// The MmramReservedRegions points to an array of one or more EFI_MM_RESERVED_MMRAM_REGION structures, with
+/// the last structure having the MmramReservedSize set to 0. An empty array would contain only the last
+/// structure.
+///
+/// The RegisterMmEntry() function allows the MM IPL PEIM to register the MM Foundation entry point with the
+/// MM entry vector code.
+///
+struct _EFI_PEI_MM_CONFIGURATION_PPI {
+  EFI_MM_RESERVED_MMRAM_REGION  *MmramReservedRegions;
+  EFI_PEI_MM_REGISTER_MM_ENTRY  RegisterMmEntry;
+};
+
+extern EFI_GUID gEfiPeiMmConfigurationPpi;
+
+#endif
diff --git a/MdePkg/MdePkg.dec b/MdePkg/MdePkg.dec
index b49f88d..c5319fd 100644
--- a/MdePkg/MdePkg.dec
+++ b/MdePkg/MdePkg.dec
@@ -983,6 +983,9 @@
   ## Include/Ppi/MmControl.h
   gEfiPeiMmControlPpiGuid         =  { 0x61c68702, 0x4d7e, 0x4f43, { 0x8d, 0xef, 0xa7, 0x43, 0x5, 0xce, 0x74, 0xc5 }}
 
+  ## Include/Ppi/MmConfiguration.h
+  gEfiPeiMmConfigurationPpi       =  { 0xc109319, 0xc149, 0x450e, { 0xa3, 0xe3, 0xb9, 0xba, 0xdd, 0x9d, 0xc3, 0xa4 } }
+
   #
   # PPIs defined in PI 1.7.
   #