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diff --git a/MdePkg/Library/DxeIoLibCpuIo/DxeCpuIoLibInternal.h b/MdePkg/Library/DxeIoLibCpuIo/DxeCpuIoLibInternal.h
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index 0000000000..11a5f6eeb8
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+++ b/MdePkg/Library/DxeIoLibCpuIo/DxeCpuIoLibInternal.h
@@ -0,0 +1,107 @@
+/** @file
+  Internal include file of DXE CPU IO Library.
+
+  Copyright (c) 2006, 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.
+
+  Module Name:  DxeCpuIoLibInternal.h
+
+**/
+
+#ifndef __DXE_CPUIO_LIB_INTERNAL_H__
+#define __DXE_CPUIO_LIB_INTERNAL_H__
+
+/**
+  Reads registers in the EFI CPU I/O space.
+
+  Reads the I/O port specified by Port with registers width specified by Width.
+  The read value is returned. If such operations are not supported, then ASSERT().
+  This function must guarantee that all I/O read and write operations are serialized.
+
+  @param  Port          The base address of the I/O operation.
+                        The caller is responsible for aligning the Address if required.
+  @param  Width         The width of the I/O operation.
+
+  @return Data read from registers in the EFI CPU I/O space.
+
+**/
+UINT64
+EFIAPI
+IoReadWorker (
+  IN      UINTN                     Port,
+  IN      EFI_CPU_IO_PROTOCOL_WIDTH Width
+  );
+
+/**
+  Writes registers in the EFI CPU I/O space.
+
+  Writes the I/O port specified by Port with registers width and value specified by Width
+  and Data respectively.  Data is returned. If such operations are not supported, then ASSERT().
+  This function must guarantee that all I/O read and write operations are serialized.
+
+  @param  Port          The base address of the I/O operation.
+                        The caller is responsible for aligning the Address if required.
+  @param  Width         The width of the I/O operation.
+  @param  Data          The value to write to the I/O port.
+
+  @return The paramter of Data.
+
+**/
+UINT64
+EFIAPI
+IoWriteWorker (
+  IN      UINTN                     Port,
+  IN      EFI_CPU_IO_PROTOCOL_WIDTH Width,
+  IN      UINT64                    Data
+  );
+
+/**
+  Reads memory-mapped registers in the EFI system memory space.
+
+  Reads the MMIO registers specified by Address with registers width specified by Width.
+  The read value is returned. If such operations are not supported, then ASSERT().
+  This function must guarantee that all MMIO read and write operations are serialized.
+
+  @param  Address       The MMIO register to read.
+                        The caller is responsible for aligning the Address if required.
+  @param  Width         The width of the I/O operation.
+
+  @return Data read from registers in the EFI system memory space.
+
+**/
+UINT64
+EFIAPI
+MmioReadWorker (
+  IN      UINTN                     Address,
+  IN      EFI_CPU_IO_PROTOCOL_WIDTH Width
+  );
+
+/**
+  Writes memory-mapped registers in the EFI system memory space.
+
+  Writes the MMIO registers specified by Address with registers width and value specified by Width
+  and Data respectively. Data is returned. If such operations are not supported, then ASSERT().
+  This function must guarantee that all MMIO read and write operations are serialized.
+
+  @param  Address       The MMIO register to read.
+                        The caller is responsible for aligning the Address if required.
+  @param  Width         The width of the I/O operation.
+
+  @return Data read from registers in the EFI system memory space.
+
+**/
+UINT64
+EFIAPI
+MmioWriteWorker (
+  IN      UINTN                     Address,
+  IN      EFI_CPU_IO_PROTOCOL_WIDTH Width,
+  IN      UINT64                    Data
+  );
+
+#endif