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diff --git a/ArmPkg/Include/Library/ArmHvcLib.h b/ArmPkg/Include/Library/ArmHvcLib.h
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+++ b/ArmPkg/Include/Library/ArmHvcLib.h
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+/** @file
+*
+*  Copyright (c) 2012-2014, ARM Limited. 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 __ARM_HVC_LIB__
+#define __ARM_HVC_LIB__
+
+/**
+ * The size of the HVC arguments are different between AArch64 and AArch32.
+ * The native size is used for the arguments.
+ */
+typedef struct {
+  UINTN  Arg0;
+  UINTN  Arg1;
+  UINTN  Arg2;
+  UINTN  Arg3;
+  UINTN  Arg4;
+  UINTN  Arg5;
+  UINTN  Arg6;
+  UINTN  Arg7;
+} ARM_HVC_ARGS;
+
+/**
+  Trigger an HVC call
+
+  HVC calls can take up to 8 arguments and return up to 4 return values.
+  Therefore, the 4 first fields in the ARM_HVC_ARGS structure are used
+  for both input and output values.
+
+**/
+VOID
+ArmCallHvc (
+  IN OUT ARM_HVC_ARGS *Args
+  );
+
+#endif