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diff --git a/ReferenceCode/Haswell/Ppi/Cache/Cache.h b/ReferenceCode/Haswell/Ppi/Cache/Cache.h
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+++ b/ReferenceCode/Haswell/Ppi/Cache/Cache.h
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+/** @file
+  Cache PPI defined in EFI 2.0
+  This code abstracts Cache Settings
+
+@copyright
+  Copyright (c) 1999 - 2012 Intel Corporation. All rights reserved
+  This software and associated documentation (if any) is furnished
+  under a license and may only be used or copied in accordance
+  with the terms of the license. Except as permitted by such
+  license, no part of this software or documentation may be
+  reproduced, stored in a retrieval system, or transmitted in any
+  form or by any means without the express written consent of
+  Intel Corporation.
+
+  This file contains 'Framework Code' and is licensed as such
+  under the terms of your license agreement with Intel or your
+  vendor.  This file may not be modified, except as allowed by
+  additional terms of your license agreement.
+**/
+#ifndef _PEI_CACHE_PPI_H_
+#define _PEI_CACHE_PPI_H_
+
+#define PEI_CACHE_PPI_GUID \
+  { \
+    0x9be4bc2, 0x790e, 0x4dea, 0x8b, 0xdc, 0x38, 0x5, 0x16, 0x98, 0x39, 0x44 \
+  }
+
+EFI_FORWARD_DECLARATION (PEI_CACHE_PPI);
+
+typedef enum _EFI_MEMORY_CACHE_TYPE
+{
+  EfiCacheTypeUncacheable   = 0,
+  EfiCacheTypeWriteCombining= 1,
+  EfiCacheTypeReserved2     = 2,
+  EfiCacheTypeReserved3     = 3,
+  EfiCacheTypeWriteThrough  = 4,
+  EfiCacheTypeWriteProtected= 5,
+  EfiCacheTypeWriteBack     = 6,
+  EfiCacheTypeMaximumType   = 7
+} EFI_MEMORY_CACHE_TYPE;
+
+typedef
+EFI_STATUS
+(EFIAPI *PEI_SET_CACHE_PPI)(
+  IN EFI_PEI_SERVICES      **PeiServices,
+  IN PEI_CACHE_PPI         *This,
+  IN EFI_PHYSICAL_ADDRESS  MemoryAddress,
+  IN UINT64                MemoryLength,
+  IN EFI_MEMORY_CACHE_TYPE MemoryCacheType
+  );
+
+typedef
+EFI_STATUS
+(EFIAPI *PEI_RESET_CACHE_PPI)(
+  IN EFI_PEI_SERVICES **PeiServices,
+  IN PEI_CACHE_PPI    *This
+  );
+
+typedef
+EFI_STATUS
+(EFIAPI *PEI_ACTIVATE_CACHE_PPI)(
+  IN EFI_PEI_SERVICES **PeiServices,
+  IN PEI_CACHE_PPI    *This
+  );
+
+///
+/// Platform code can use this interface to arrange MTRR configuration in PEI phase.
+///
+struct _PEI_CACHE_PPI {
+  ///
+  /// Set MTRR configuration for a memory region.
+  ///
+  PEI_SET_CACHE_PPI      SetCache;
+  ///
+  /// Clean up MTRR in MTRR buffer.
+  ///
+  PEI_RESET_CACHE_PPI    ResetCache;
+  ///
+  /// Disable NEM if in NEM mode, and sync MTRR configuration from buffer to MSR.
+  ///
+  PEI_ACTIVATE_CACHE_PPI ActivateCache;
+};
+
+extern EFI_GUID gPeiCachePpiGuid;
+
+#endif