diff --git a/MdePkg/Include/Protocol/SmmBase2.h b/MdePkg/Include/Protocol/SmmBase2.h
new file mode 100644
index 0000000000..dc1b218774
--- /dev/null
+++ b/MdePkg/Include/Protocol/SmmBase2.h
@@ -0,0 +1,87 @@
+/** @file
+  EFI SMM Base2 Protocol as defined in the PI 1.2 specification.
+
+  This protocol is utilized by all SMM drivers to locate the SMM infrastructure services and determine
+  whether the driver is being invoked inside SMRAM or outside of SMRAM.
+
+  Copyright (c) 2009, Intel Corporation                                                         
+  All rights reserved. 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 _SMM_BASE2_H_
+#define _SMM_BASE2_H_
+
+#include <Pi/PiSmmCis.h>
+
+#define EFI_SMM_BASE2_PROTOCOL_GUID \
+  { \
+    0xf4ccbfb7, 0xf6e0, 0x47fd, {0x9d, 0xd4, 0x10, 0xa8, 0xf1, 0x50, 0xc1, 0x91 }  \
+  }
+
+typedef struct _EFI_SMM_BASE2_PROTOCOL  EFI_SMM_BASE2_PROTOCOL;
+
+/**
+  Service to indicate whether the driver is currently executing in the SMM Initialization phase.
+  
+  This service is used to indicate whether the driver is currently executing in the SMM Initialization 
+  phase. For SMM drivers, this will return TRUE in InSmram while inside the driver's entry point and 
+  otherwise FALSE. For combination SMM/DXE drivers, this will return FALSE in the DXE launch. For the
+  SMM launch, it behaves as an SMM driver.
+
+  @param[in]  This               The EFI_SMM_BASE2_PROTOCOL instance. 
+  @param[out] InSmram            Pointer to a Boolean which, on return, indicates that the driver is
+                                 currently executing inside of SMRAM (TRUE) or outside of SMRAM (FALSE).
+
+  @retval EFI_SUCCESS            The call returned successfully.
+  @retval EFI_INVALID_PARAMETER  InSmram was NULL.
+**/
+typedef
+EFI_STATUS
+(EFIAPI *EFI_SMM_INSIDE_OUT)(
+  IN CONST EFI_SMM_BASE2_PROTOCOL  *This,
+  OUT BOOLEAN                      *InSmram
+  )
+;
+
+/**
+  Returns the location of the System Management Service Table (SMST).
+
+  This function returns the location of the System Management Service Table (SMST).  The use of the 
+  API is such that a driver can discover the location of the SMST in its entry point and then cache it in 
+  some driver global variable so that the SMST can be invoked in subsequent handlers.
+
+  @param[in]     This            The EFI_SMM_BASE2_PROTOCOL instance.
+  @param[in,out] Smst            On return, points to a pointer to the System Management Service Table (SMST).
+
+  @retval EFI_SUCCESS            The operation was successful.
+  @retval EFI_INVALID_PARAMETER  Smst was invalid.
+  @retval EFI_UNSUPPORTED        Not in SMM.
+**/
+typedef
+EFI_STATUS
+(EFIAPI *EFI_SMM_GET_SMST_LOCATION)(
+  IN CONST EFI_SMM_BASE2_PROTOCOL  *This,
+  IN OUT EFI_SMM_SYSTEM_TABLE      **Smst
+  )
+;
+
+///
+/// EFI SMM Base2 Protocol is utilized by all SMM drivers to locate the SMM infrastructure
+/// services and determine whether the driver is being invoked inside SMRAM or outside of SMRAM.
+///
+struct _EFI_SMM_BASE2_PROTOCOL {
+  EFI_SMM_INSIDE_OUT         InSmm;
+  EFI_SMM_GET_SMST_LOCATION  GetSmstLocation;
+};
+
+extern EFI_GUID gEfiSmmBase2ProtocolGuid;
+
+#endif
+
diff --git a/MdePkg/MdePkg.dec b/MdePkg/MdePkg.dec
index b6c7ac37a4..a0c8c68230 100644
--- a/MdePkg/MdePkg.dec
+++ b/MdePkg/MdePkg.dec
@@ -578,6 +578,9 @@
   ## Include/Protocol/SmmCpuIo.h
   gEfiSmmCpuIoProtocolGuid        = { 0x3242a9d8, 0xce70, 0x4aa0, { 0x95, 0x5d, 0x5e, 0x7b, 0x14, 0x0d, 0xe4, 0xd2 }}
 
+  ## Include/Protocol/SmmBase2.h
+  gEfiSmmBase2ProtocolGuid        = { 0xf4ccbfb7, 0xf6e0, 0x47fd, {0x9d, 0xd4, 0x10, 0xa8, 0xf1, 0x50, 0xc1, 0x91 }}
+
   #
   # Protocols defined in UEFI2.1/UEFI2.0/EFI1.1
   #