1 files changed, 70 insertions, 0 deletions
diff --git a/MdePkg/Library/BaseMemoryLibMmx/X64/CopyMem.asm b/MdePkg/Library/BaseMemoryLibMmx/X64/CopyMem.asm
new file mode 100644
index 0000000000000..120e3e8dd4fae
--- /dev/null
+++ b/MdePkg/Library/BaseMemoryLibMmx/X64/CopyMem.asm
@@ -0,0 +1,70 @@
+;------------------------------------------------------------------------------
+;
+; 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:
+;
+;   CopyMem.asm
+;
+; Abstract:
+;
+;   CopyMem function
+;
+; Notes:
+;
+;------------------------------------------------------------------------------
+
+    .code
+
+;------------------------------------------------------------------------------
+; VOID *
+; EFIAPI
+; InternalMemCopyMem (
+;   OUT     VOID                      *DestinationBuffer,
+;   IN      CONST VOID                *SourceBuffer,
+;   IN      UINTN                     Length
+;   );
+;------------------------------------------------------------------------------
+InternalMemCopyMem  PROC    USES    rsi rdi
+    mov     rsi, rdx                    ; rsi <- Source
+    mov     rdi, rcx                    ; rdi <- Destination
+    lea     r9, [rsi + r8 - 1]          ; r9 <- End of Source
+    cmp     rsi, rdi
+    mov     rax, rdi                    ; rax <- Destination as return value
+    jae     @F
+    cmp     r9, rdi
+    jae     @CopyBackward               ; Copy backward if overlapped
+@@:
+    mov     rcx, r8
+    and     r8, 7
+    shr     rcx, 3                      ; rcx <- # of Qwords to copy
+    jz      @CopyBytes
+    DB      49h, 0fh, 7eh, 0c2h         ; movd r10, mm0 (Save mm0 in r10)
+@@:
+    DB      0fh, 6fh, 06h               ; movd mm0, [rsi]
+    DB      0fh, 0e7h, 07h              ; movntq [rdi], mm0
+    add     rsi, 8
+    add     rdi, 8
+    loop    @B
+    mfence
+    DB      49h, 0fh, 6eh, 0c2h         ; movd mm0, r10 (Restore mm0)
+    jmp     @CopyBytes
+@CopyBackward:
+    mov     rsi, r9                     ; rsi <- End of Source
+    lea     rdi, [rdi + r8 - 1]         ; rdi <- End of Destination
+    std                                 ; set direction flag
+@CopyBytes:
+    mov     rcx, r8
+    rep     movsb                       ; Copy bytes backward
+    cld
+    ret
+InternalMemCopyMem  ENDP
+
+    END