1 files changed, 53 insertions, 0 deletions
diff --git a/EdkCompatibilityPkg/Foundation/Library/EfiCommonLib/x64/EfiZeroMem.asm b/EdkCompatibilityPkg/Foundation/Library/EfiCommonLib/x64/EfiZeroMem.asm
new file mode 100644
index 0000000000..5f2c077673
--- /dev/null
+++ b/EdkCompatibilityPkg/Foundation/Library/EfiCommonLib/x64/EfiZeroMem.asm
@@ -0,0 +1,53 @@
+;------------------------------------------------------------------------------
+;
+; Copyright (c) 2007, 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:
+;
+;   ZeroMem.asm
+;
+; Abstract:
+;
+;   ZeroMem function
+;
+; Notes:
+;
+;------------------------------------------------------------------------------
+
+    .code
+
+;------------------------------------------------------------------------------
+;  VOID *
+;  EfiCommonLibZeroMem (
+;    IN VOID   *Buffer,
+;    IN UINTN  Size
+;    );
+;------------------------------------------------------------------------------
+EfiCommonLibZeroMem  PROC    USES    rdi
+    mov     rdi, rcx
+    mov     rcx, rdx
+    mov     r8, rdi
+    and     edx, 7
+    shr     rcx, 3
+    jz      @ZeroBytes
+    DB      0fh, 0efh, 0c0h             ; pxor mm0, mm0
+@@:
+    DB      48h, 0fh, 7eh, 07h          ; movd [rdi], mm0
+    add     rdi, 8
+    loop    @B
+@ZeroBytes:
+    xor     eax, eax
+    mov     ecx, edx
+    rep     stosb
+    mov     rax, r8
+    ret
+EfiCommonLibZeroMem  ENDP
+
+    END