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diff --git a/EmulatorPkg/Include/Protocol/EmuIoThunk.h b/EmulatorPkg/Include/Protocol/EmuIoThunk.h
new file mode 100644
index 0000000000..af132bea7e
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+++ b/EmulatorPkg/Include/Protocol/EmuIoThunk.h
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+/** @file
+  Emulator Thunk to abstract OS services from pure EFI code
+
+  Copyright (c) 2010 - 2011, Apple Inc. 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 __EMU_IO_THUNK__ 
+#define __EMU_IO_THUNK__
+
+
+#define EMU_IO_THUNK_PROTOCO_GUID  \
+ { 0x453368F6, 0x7C85, 0x434A, { 0xA9, 0x8A, 0x72, 0xD1, 0xB7, 0xFF, 0xA9, 0x26 } }
+
+
+typedef struct _EMU_IO_THUNK_PROTOCOL  EMU_IO_THUNK_PROTOCOL;
+
+
+typedef 
+EFI_STATUS
+(EFIAPI *EMU_IO_THUNK_PROTOCOL_CLOSE_OPEN) (
+  IN  EMU_IO_THUNK_PROTOCOL   *This
+  );
+
+typedef 
+EFI_STATUS
+(EFIAPI *EMU_IO_THUNK_PROTOCOL_CLOSE_CLOSE) (
+  IN  EMU_IO_THUNK_PROTOCOL   *This
+  );
+
+struct _EMU_IO_THUNK_PROTOCOL {
+  EFI_GUID                            *Protocol;
+  VOID                                *Interface;  /// Only be valid after Open() is called
+  CHAR16                              *ConfigString;
+  UINT16                              Instance;
+  EMU_IO_THUNK_PROTOCOL_CLOSE_OPEN    Open;
+  EMU_IO_THUNK_PROTOCOL_CLOSE_CLOSE   Close;
+  VOID                                *Private;    /// Used by implementation 
+};
+
+extern EFI_GUID gEmuIoThunkProtocolGuid;
+
+#endif