1 files changed, 57 insertions, 0 deletions
diff --git a/Core/MdePkg/Library/BaseMemoryLibMmx/X64/SetMem16.asm b/Core/MdePkg/Library/BaseMemoryLibMmx/X64/SetMem16.asm
new file mode 100644
index 0000000000..fbd98b0fe9
--- /dev/null
+++ b/Core/MdePkg/Library/BaseMemoryLibMmx/X64/SetMem16.asm
@@ -0,0 +1,57 @@
+;------------------------------------------------------------------------------
+;
+; Copyright (c) 2006, 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:
+;
+;   SetMem16.asm
+;
+; Abstract:
+;
+;   SetMem16 function
+;
+; Notes:
+;
+;------------------------------------------------------------------------------
+
+    .code
+
+;------------------------------------------------------------------------------
+; VOID *
+; EFIAPI
+; InternalMemSetMem16 (
+;   OUT     VOID                      *Buffer,
+;   IN      UINTN                     Length,
+;   IN      UINT16                    Value
+;   );
+;------------------------------------------------------------------------------
+InternalMemSetMem16 PROC    USES    rdi
+    mov     rax, r8
+    DB      48h, 0fh, 6eh, 0c0h         ; movd mm0, rax
+    mov     r8, rcx
+    mov     rdi, r8
+    mov     rcx, rdx
+    and     edx, 3
+    shr     rcx, 2
+    jz      @SetWords
+    DB      0fh, 70h, 0C0h, 00h         ; pshufw mm0, mm0, 0h
+@@:
+    DB      0fh, 0e7h, 07h              ; movntq [rdi], mm0
+    add     rdi, 8
+    loop    @B
+    mfence
+@SetWords:
+    mov     ecx, edx
+    rep     stosw
+    mov     rax, r8
+    ret
+InternalMemSetMem16 ENDP
+
+    END