diff --git a/IntelFrameworkPkg/Include/Protocol/CpuIo.h b/IntelFrameworkPkg/Include/Protocol/CpuIo.h
index 52658806ea..8d578f3161 100644
--- a/IntelFrameworkPkg/Include/Protocol/CpuIo.h
+++ b/IntelFrameworkPkg/Include/Protocol/CpuIo.h
@@ -1,6 +1,10 @@
 /** @file
   This code abstracts the CPU IO Protocol which installed by some platform or chipset-specific 
-  PEIM that abstracts the processor-visible I/O operations.
+  PEIM that abstracts the processor-visible I/O operations. 
+  
+  Note: This is a runtime protocol and can be used by runtime drivers after ExitBootServices().
+  It is different from the PI 1.2 CPU I/O 2 Protocol, which is a boot services only protocol
+  and may not be used by runtime drivers after ExitBootServices().
 
   Copyright (c) 2007 - 2009, Intel Corporation
   All rights reserved. This program and the accompanying materials
@@ -20,89 +24,22 @@
 #ifndef _CPUIO_H_
 #define _CPUIO_H_
 
+#include <Protocol/CpuIo2.h>
 
 #define EFI_CPU_IO_PROTOCOL_GUID \
   { \
     0xB0732526, 0x38C8, 0x4b40, {0x88, 0x77, 0x61, 0xC7, 0xB0, 0x6A, 0xAC, 0x45 } \
   }
 
-typedef struct _EFI_CPU_IO_PROTOCOL EFI_CPU_IO_PROTOCOL;
-
-///
-/// Enumeration that defines the width of the I/O operation.
-///
-typedef enum {
-  EfiCpuIoWidthUint8,
-  EfiCpuIoWidthUint16,
-  EfiCpuIoWidthUint32,
-  EfiCpuIoWidthUint64,
-  EfiCpuIoWidthFifoUint8,
-  EfiCpuIoWidthFifoUint16,
-  EfiCpuIoWidthFifoUint32,
-  EfiCpuIoWidthFifoUint64,
-  EfiCpuIoWidthFillUint8,
-  EfiCpuIoWidthFillUint16,
-  EfiCpuIoWidthFillUint32,
-  EfiCpuIoWidthFillUint64,
-  EfiCpuIoWidthMaximum
-} EFI_CPU_IO_PROTOCOL_WIDTH;
-
-/**
-  Enables a driver to access memory-mapped registers in the EFI system memory space.
-  Or, enables a driver to access registers in the EFI CPU I/O space.
-
-  @param[in]       This         A pointer to the EFI_CPU_IO_PROTOCOL instance.
-  @param[in]       Width        Signifies the width of the I/O or Memory operation.
-  @param[in]       Address      The base address of the I/O or Memory operation.
-  @param[in]       Count        The number of I/O or Memory operations to perform.
-                                The number of bytes moved is Width size * Count, starting at Address.
-  @param[in, out]  Buffer       For read operations, the destination buffer to store the results.
-                                For write operations, the source buffer from which to write data.
-
-  @retval EFI_SUCCESS           The data was read from or written to the EFI system.
-  @retval EFI_INVALID_PARAMETER Width is invalid for this EFI system. Or Buffer is NULL.
-  @retval EFI_UNSUPPORTED       The Buffer is not aligned for the given Width.
-                                Or,The address range specified by Address, Width, and Count is not valid for this EFI system.
-
-**/
-typedef
-EFI_STATUS
-(EFIAPI *EFI_CPU_IO_PROTOCOL_IO_MEM)(
-  IN     EFI_CPU_IO_PROTOCOL               *This,
-  IN     EFI_CPU_IO_PROTOCOL_WIDTH         Width,
-  IN     UINT64                            Address,
-  IN     UINTN                             Count,
-  IN OUT VOID                              *Buffer
-  );
-
-///
-/// Service for read and write accesses.
-///
-typedef struct {
-  ///
-  /// This service provides the various modalities of memory and I/O read.
-  ///
-  EFI_CPU_IO_PROTOCOL_IO_MEM  Read;
-  ///
-  /// This service provides the various modalities of memory and I/O write.
-  ///
-  EFI_CPU_IO_PROTOCOL_IO_MEM  Write;
-} EFI_CPU_IO_PROTOCOL_ACCESS;
-
-///
-/// Provides the basic memory and I/O interfaces that are used to abstract
-/// accesses to devices in a system.
-///
-struct _EFI_CPU_IO_PROTOCOL {
-  ///
-  /// Enables a driver to access memory-mapped registers in the EFI system memory space.
-  ///
-  EFI_CPU_IO_PROTOCOL_ACCESS  Mem;
-  ///
-  /// Enables a driver to access registers in the EFI CPU I/O space.
-  ///
-  EFI_CPU_IO_PROTOCOL_ACCESS  Io;
-};
+//
+// Framework CPU IO protocol structure is the same as CPU IO 2 protocol defined in PI 1.2 spec. 
+// However, there is a significant different between the Framework CPU I/O
+// Protocol and the PI 1.2 CPU I/O 2 Protocol.  The Framework one is a runtime
+// protocol, which means it can be used by runtime drivers after ExitBootServices().
+// The PI one is not runtime safe, so it is a boot services only protocol and may
+// not be used by runtime drivers after ExitBootServices().
+// 
+typedef EFI_CPU_IO2_PROTOCOL EFI_CPU_IO_PROTOCOL;
 
 extern EFI_GUID gEfiCpuIoProtocolGuid;