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diff --git a/UefiCpuPkg/CpuMpPei/PeiMpServices.h b/UefiCpuPkg/CpuMpPei/PeiMpServices.h
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+++ b/UefiCpuPkg/CpuMpPei/PeiMpServices.h
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+/** @file
+  Functions prototype of Multiple Processor PPI services.
+
+  Copyright (c) 2015, 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.
+
+**/
+
+#ifndef _PEI_MP_SERVICES_H_
+#define _PEI_MP_SERVICES_H_
+
+#include "CpuMpPei.h"
+
+
+/**
+  This return the handle number for the calling processor.  This service may be
+  called from the BSP and APs.
+
+  This service returns the processor handle number for the calling processor.
+  The returned value is in the range from 0 to the total number of logical
+  processors minus 1. The total number of logical processors can be retrieved
+  with EFI_PEI_MP_SERVICES_PPI.GetNumberOfProcessors(). This service may be
+  called from the BSP and APs. If ProcessorNumber is NULL, then EFI_INVALID_PARAMETER
+  is returned. Otherwise, the current processors handle number is returned in
+  ProcessorNumber, and EFI_SUCCESS is returned.
+
+  @param[in]  PeiServices         An indirect pointer to the PEI Services Table
+                                  published by the PEI Foundation.
+  @param[in]  This                A pointer to the EFI_PEI_MP_SERVICES_PPI instance.
+  @param[out] ProcessorNumber     The handle number of the AP. The range is from 0 to the
+                                  total number of logical processors minus 1. The total
+                                  number of logical processors can be retrieved by
+                                  EFI_PEI_MP_SERVICES_PPI.GetNumberOfProcessors().
+
+  @retval EFI_SUCCESS             The current processor handle number was returned in
+                                  ProcessorNumber.
+  @retval EFI_INVALID_PARAMETER   ProcessorNumber is NULL.
+**/
+EFI_STATUS
+EFIAPI
+PeiWhoAmI (
+  IN  CONST EFI_PEI_SERVICES   **PeiServices,
+  IN  EFI_PEI_MP_SERVICES_PPI  *This,
+  OUT UINTN                    *ProcessorNumber
+  );
+
+#endif