1 files changed, 61 insertions, 0 deletions
diff --git a/Core/MdePkg/Library/BaseMemoryLibOptPei/Ia32/CopyMem.asm b/Core/MdePkg/Library/BaseMemoryLibOptPei/Ia32/CopyMem.asm
new file mode 100644
index 0000000000..6f8d007bc2
--- /dev/null
+++ b/Core/MdePkg/Library/BaseMemoryLibOptPei/Ia32/CopyMem.asm
@@ -0,0 +1,61 @@
+;------------------------------------------------------------------------------
+;
+; 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:
+;
+;------------------------------------------------------------------------------
+
+    .386
+    .model  flat,C
+    .code
+
+;------------------------------------------------------------------------------
+;  VOID *
+;  InternalMemCopyMem (
+;    IN VOID   *Destination,
+;    IN VOID   *Source,
+;    IN UINTN  Count
+;    )
+;------------------------------------------------------------------------------
+InternalMemCopyMem  PROC    USES    esi edi
+    mov     esi, [esp+16]                ; esi <- Source
+    mov     edi, [esp+12]                ; edi <- Destination
+    mov     edx, [esp+20]                ; edx <- Count
+    cmp     esi, edi
+    je      @CopyDone
+    cmp     edx, 0
+    je      @CopyDone
+    lea     eax, [esi + edx - 1]         ; eax <- End of Source
+    cmp     esi, edi
+    jae     @CopyBytes
+    cmp     eax, edi
+    jb      @CopyBytes                   ; Copy backward if overlapped
+    mov     esi, eax                     ; esi <- End of Source
+    lea     edi, [edi + edx - 1]         ; edi <- End of Destination
+    std
+@CopyBytes:
+    mov     ecx, edx
+    rep     movsb                        ; Copy bytes backward
+    cld
+@CopyDone:
+    mov     eax, [esp + 12]             ; eax <- Destination as return value
+    ret
+InternalMemCopyMem  ENDP
+
+    END