1 files changed, 51 insertions, 0 deletions
diff --git a/Core/MdePkg/Library/BaseMemoryLibOptDxe/X64/ZeroMem.S b/Core/MdePkg/Library/BaseMemoryLibOptDxe/X64/ZeroMem.S
new file mode 100644
index 0000000000..3432f23c68
--- /dev/null
+++ b/Core/MdePkg/Library/BaseMemoryLibOptDxe/X64/ZeroMem.S
@@ -0,0 +1,51 @@
+#
+# ConvertAsm.py: Automatically generated from ZeroMem.asm
+#
+#------------------------------------------------------------------------------
+#
+# Copyright (c) 2006 - 2009, Intel Corporation. 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.
+#
+# Module Name:
+#
+#   ZeroMem.S
+#
+# Abstract:
+#
+#   ZeroMem function
+#
+# Notes:
+#
+#------------------------------------------------------------------------------
+
+
+#------------------------------------------------------------------------------
+#  VOID *
+#  InternalMemZeroMem (
+#    IN VOID   *Buffer,
+#    IN UINTN  Count
+#    );
+#------------------------------------------------------------------------------
+ASM_GLOBAL ASM_PFX(InternalMemZeroMem)
+ASM_PFX(InternalMemZeroMem):
+    pushq   %rdi
+    pushq   %rcx
+    xorq    %rax, %rax
+    movq    %rcx, %rdi
+    movq    %rdx, %rcx
+    shrq    $3, %rcx
+    andq    $7, %rdx
+    cld
+    rep     stosq
+    movq    %rdx, %rcx
+    rep     stosb
+    popq    %rax
+    popq    %rdi
+    ret
+