1 files changed, 79 insertions, 0 deletions
diff --git a/EdkCompatibilityPkg/Foundation/Library/EfiCommonLib/Ia32/EfiCopyMemRep4.c b/EdkCompatibilityPkg/Foundation/Library/EfiCommonLib/Ia32/EfiCopyMemRep4.c
new file mode 100644
index 0000000000..033d9b9d76
--- /dev/null
+++ b/EdkCompatibilityPkg/Foundation/Library/EfiCommonLib/Ia32/EfiCopyMemRep4.c
@@ -0,0 +1,79 @@
+/*++
+
+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:
+
+  EfiCopyMemRep4.c
+
+Abstract:
+
+  This is the code that uses rep movsd CopyMem service
+
+--*/
+
+#include "Tiano.h"
+
+VOID
+EfiCommonLibCopyMem (
+  IN VOID   *Destination,
+  IN VOID   *Source,
+  IN UINTN  Count
+  )
+/*++
+
+Routine Description:
+
+  Copy Length bytes from Source to Destination.
+
+Arguments:
+
+  Destination - Target of copy
+
+  Source      - Place to copy from
+
+  Length      - Number of bytes to copy
+
+Returns:
+
+  None
+
+--*/
+{
+  __asm {
+    mov     esi, Source                  ; esi <- Source
+    mov     edi, Destination             ; edi <- Destination
+    mov     edx, Count                   ; 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     _CopyDWord
+    cmp     eax, edi
+    jae     _CopyBackward                ; Copy backward if overlapped
+_CopyDWord:
+    mov     ecx, edx
+    and     edx, 3
+    shr     ecx, 2
+    rep     movsd                        ; Copy as many Dwords as possible
+    jmp     _CopyBytes
+_CopyBackward:
+    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:
+  }
+}
+\ No newline at end of file