--- /dev/null
+/*++\r
+\r
+Copyright (c) 2004 - 2006, Intel Corporation \r
+All rights reserved. This program and the accompanying materials \r
+are licensed and made available under the terms and conditions of the BSD License \r
+which accompanies this distribution. The full text of the license may be found at \r
+http://opensource.org/licenses/bsd-license.php \r
+ \r
+THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, \r
+WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. \r
+\r
+\r
+Module Name:\r
+\r
+ CopyMem.c\r
+ \r
+Abstract: \r
+\r
+ Internal CopyMem\r
+\r
+--*/\r
+\r
+#include "BaseMemoryLibInternal.h"\r
+\r
+/**\r
+ Copy Length bytes from Source to Destination.\r
+\r
+ @param Destination Target of copy\r
+ @param Source Place to copy from\r
+ @param Length Number of bytes to copy\r
+\r
+ @return Destination\r
+\r
+**/\r
+VOID *\r
+EFIAPI\r
+InternalMemCopyMem (\r
+ OUT VOID *Destination,\r
+ IN CONST VOID *Source,\r
+ IN UINTN Length\r
+ )\r
+{\r
+ //\r
+ // Declare the local variables that actually move the data elements as\r
+ // volatile to prevent the optimizer from replacing this function with\r
+ // the intrinsic memcpy()\r
+ //\r
+ volatile UINT8 *Destination8;\r
+ CONST UINT8 *Source8;\r
+\r
+ if (Source > Destination) {\r
+ Destination8 = (UINT8*)Destination;\r
+ Source8 = (CONST UINT8*)Source;\r
+ while (Length-- != 0) {\r
+ *(Destination8++) = *(Source8++);\r
+ }\r
+ } else if (Source < Destination) {\r
+ Destination8 = (UINT8*)Destination + Length;\r
+ Source8 = (CONST UINT8*)Source + Length;\r
+ while (Length-- != 0) {\r
+ *(--Destination8) = *(--Source8);\r
+ }\r
+ }\r
+ return Destination;\r
+}\r