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diff --git a/ArmPkg/Include/Library/SemihostLib.h b/ArmPkg/Include/Library/SemihostLib.h
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+++ b/ArmPkg/Include/Library/SemihostLib.h
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+/** @file
+
+  Copyright (c) 2008-2009 Apple Inc. All rights reserved.<BR>
+
+  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.
+
+**/
+
+#ifndef __SEMIHOSTING_H__
+#define __SEMIHOSTING_H__
+
+/*
+ *
+ *  Please refer to ARM RVDS 3.0 Compiler and Libraries Guide for more information
+ *  about the semihosting interface.
+ *
+ */
+ 
+#define SEMIHOST_FILE_MODE_READ     (0 << 2)
+#define SEMIHOST_FILE_MODE_WRITE    (1 << 2)
+#define SEMIHOST_FILE_MODE_APPEND   (2 << 2)
+#define SEMIHOST_FILE_MODE_CREATE   (1 << 1)
+#define SEMIHOST_FILE_MODE_BINARY   (1 << 0)
+#define SEMIHOST_FILE_MODE_ASCII    (0 << 0)
+
+BOOLEAN
+SemihostConnectionSupported (
+  VOID
+  );
+
+EFI_STATUS
+SemihostFileOpen (
+  IN  CHAR8  *FileName,
+  IN  UINT32 Mode,
+  OUT UINT32 *FileHandle
+  );
+
+EFI_STATUS
+SemihostFileSeek (
+  IN UINT32 FileHandle,
+  IN UINT32 Offset
+  );
+
+EFI_STATUS
+SemihostFileRead (
+  IN     UINT32 FileHandle,
+  IN OUT UINT32 *Length,
+  OUT    VOID   *Buffer
+  );
+
+EFI_STATUS
+SemihostFileWrite (
+  IN     UINT32 FileHandle,
+  IN OUT UINT32 *Length,
+  IN     VOID   *Buffer
+  );
+
+EFI_STATUS
+SemihostFileClose (
+  IN UINT32 FileHandle
+  );
+
+EFI_STATUS
+SemihostFileLength (
+  IN  UINT32 FileHandle,
+  OUT UINT32 *Length
+  );
+
+EFI_STATUS
+SemihostFileRemove (
+  IN CHAR8 *FileName
+  );
+
+CHAR8
+SemihostReadCharacter (
+  VOID
+  );
+
+VOID
+SemihostWriteCharacter (
+  IN CHAR8 Character
+  );
+
+VOID
+SemihostWriteString (
+  IN CHAR8 *String
+  );
+  
+UINT32
+SemihostSystem (
+  IN CHAR8 *CommandLine
+  );
+  
+#endif // __SEMIHOSTING_H__