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diff --git a/ReferenceCode/Haswell/Protocol/SmmThunk/SmmThunk.h b/ReferenceCode/Haswell/Protocol/SmmThunk/SmmThunk.h
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+++ b/ReferenceCode/Haswell/Protocol/SmmThunk/SmmThunk.h
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+/** @file
+  This file defines SMM Thunk abstraction protocol.
+
+@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 an 'Intel Peripheral Driver' and is
+  licensed for Intel CPUs and chipsets under the terms of your
+  license agreement with Intel or your vendor.  This file may
+  be modified by the user, subject to additional terms of the
+  license agreement
+**/
+#ifndef _SMM_THUNK_H_
+#define _SMM_THUNK_H_
+
+EFI_FORWARD_DECLARATION (EFI_SMM_THUNK_PROTOCOL);
+
+///
+/// include LegacyBios Protocol for IA32_REGISTER_SET
+///
+#include EFI_PROTOCOL_DEFINITION (LegacyBios)
+
+#define EFI_SMM_THUNK_PROTOCOL_GUID \
+  { \
+    0x2a82fce6, 0x8bb6, 0x413e, 0xb9, 0xeb, 0x45, 0xdf, 0xc0, 0x52, 0x2d, 0xf3 \
+  }
+
+typedef
+BOOLEAN
+(EFIAPI *EFI_SMM_FARCALL86)(
+  IN EFI_SMM_THUNK_PROTOCOL          *This,
+  IN UINT16                          Segment,
+  IN UINT16                          Offset,
+  IN OUT EFI_IA32_REGISTER_SET *Regs OPTIONAL,
+  IN VOID *Stack                     OPTIONAL,
+  IN UINTN                           StackSize
+  );
+
+typedef
+BOOLEAN
+(EFIAPI *EFI_SMM_INTCALL86)(
+  IN EFI_SMM_THUNK_PROTOCOL          *This,
+  IN UINT16                          Segment,
+  IN UINT16                          Offset,
+  IN OUT EFI_IA32_REGISTER_SET *Regs OPTIONAL,
+  IN VOID *Stack                     OPTIONAL,
+  IN UINTN                           StackSize
+  );
+
+struct _EFI_SMM_THUNK_PROTOCOL {
+  EFI_SMM_FARCALL86 FarCall86;
+  EFI_SMM_INTCALL86 IntCall86;
+};
+
+extern EFI_GUID gEfiSmmThunkProtocolGuid;
+
+#endif