Add .S file for X64 GCC tool-chain for Thunk16.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@5751 6f19259b-4bc3-4df7-8a09-765794883524

EdkCompatibilityPkg/Foundation/Library/Thunk16/X64/Fx.S

@@ -0,0 +1,48 @@
+#*****************************************************************************
+#*
+#*   Copyright (c) 2008, Intel Corporation                                                         
+#*   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.             
+#*   
+#*   Module Name:
+#*
+#*    Fx.S
+#*  
+#*   Abstract:
+#*  
+#*    AsmFxRestore and AsmFxSave function
+#*  
+#*****************************************************************************
+#include <EfiBind.h>
+
+.global ASM_PFX(AsmFxSave)
+.global ASM_PFX(AsmFxRestore)
+
+    .text
+
+#------------------------------------------------------------------------------
+# VOID
+# AsmFxSave (
+#   OUT IA32_FX_BUFFER *Buffer
+#   );
+#------------------------------------------------------------------------------
+ASM_PFX(AsmFxSave):
+    fxsave (%rcx)
+    retq
+    
+#------------------------------------------------------------------------------
+# VOID
+# AsmFxRestore (
+#   IN CONST IA32_FX_BUFFER *Buffer
+#   );
+#------------------------------------------------------------------------------
+
+ASM_PFX(AsmFxRestore):
+    fxrstor (%rcx)
+    retq
+