1 files changed, 46 insertions, 0 deletions
diff --git a/EdkCompatibilityPkg/Foundation/Library/EfiCommonLib/x64/EfiZeroMemRep4.S b/EdkCompatibilityPkg/Foundation/Library/EfiCommonLib/x64/EfiZeroMemRep4.S
new file mode 100644
index 0000000000..11b9b45ab7
--- /dev/null
+++ b/EdkCompatibilityPkg/Foundation/Library/EfiCommonLib/x64/EfiZeroMemRep4.S
@@ -0,0 +1,46 @@
+#------------------------------------------------------------------------------
+#
+# 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:
+#
+#   EfiZeroMemRep4.S
+#
+# Abstract:
+#
+#   ZeroMem function
+#
+# Notes:
+#
+#------------------------------------------------------------------------------
+#include <EfiBind.h>
+
+    .code: 
+
+.global ASM_PFX(EfiCommonLibZeroMem)
+#------------------------------------------------------------------------------
+#  VOID
+#  EfiCommonLibZeroMem (
+#    IN VOID   *Buffer,
+#    IN UINTN  Size
+#    );
+#------------------------------------------------------------------------------
+ASM_PFX(EfiCommonLibZeroMem):
+      push   %rdi
+      xor    %rax,%rax
+      mov    %rcx,%rdi
+      mov    %rdx,%rcx
+      shr    $0x2,%rcx
+      and    $0x3,%rdx
+      rep stos %eax,%es:(%rdi)
+      mov    %rdx,%rcx
+      rep stos %al,%es:(%rdi)
+      pop    %rdi
+      retq   
+\ No newline at end of file