1 files changed, 72 insertions, 0 deletions
diff --git a/OldMdePkg/Library/BaseMemoryLibMmx/X64/CopyMem.S b/OldMdePkg/Library/BaseMemoryLibMmx/X64/CopyMem.S
new file mode 100644
index 0000000000..c4ecdc70eb
--- /dev/null
+++ b/OldMdePkg/Library/BaseMemoryLibMmx/X64/CopyMem.S
@@ -0,0 +1,72 @@
+#------------------------------------------------------------------------------
+#
+# Copyright (c) 2006, 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:
+#
+#   CopyMem.asm
+#
+# Abstract:
+#
+#   CopyMem function
+#
+# Notes:
+#
+#------------------------------------------------------------------------------
+
+
+#------------------------------------------------------------------------------
+# VOID *
+# EFIAPI
+# InternalMemCopyMem (
+#   OUT     VOID                      *DestinationBuffer,
+#   IN      CONST VOID                *SourceBuffer,
+#   IN      UINTN                     Length
+#   );
+#------------------------------------------------------------------------------
+.global _InternalMemCopyMem;
+_InternalMemCopyMem:
+    push    %rsi
+    push    %rdi
+    mov     %rdi, %rsi
+    mov     %rcx, %rdi
+    lea     -1(%r8,%rsi,1),%r9
+    cmp     %rdi, %rsi
+    mov     %rdi, %rax
+    jae     L1
+    cmp     %rdi, %r9
+    jae     LCopyBackward               # Copy backward if overlapped
+L1: 
+    mov     %r8, %rcx
+    and     $7, %r8
+    shr     $3, %rcx
+    jz      LCopyBytes
+    movd    %mm0, %r10                  # (Save mm0 in r10)
+L2: 
+    movd    (%rsi), %mm0
+    movntq  %mm0, (%rdi)
+    add     $8, %rsi
+    add     $8, %rdi
+    loop    L2
+    mfence
+    movd    %r10, %mm0                  #(Restore mm0)
+    jmp     LCopyBytes
+LCopyBackward: 
+    mov     %r9, %rsi
+    lea     -1(%r8,%rdi,1),%rdi
+    std                                 # set direction flag
+LCopyBytes: 
+    mov     %r8, %rcx
+    rep
+    movsb                               # Copy bytes backward
+    cld
+    pop     %rdi
+    pop     %rsi
+    ret