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e1f414b6 | 1 | /** @file\r |
d531bfee | 2 | Implementation of the InternalMemCopyMem routine. This function is broken\r |
3 | out into its own source file so that it can be excluded from a build for a\r | |
4 | particular platform easily if an optimized version is desired.\r | |
e1f414b6 | 5 | \r |
15c952e7 | 6 | Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>\r |
2fcf0abf | 7 | This program and the accompanying materials\r |
e1f414b6 | 8 | are licensed and made available under the terms and conditions of the BSD License\r |
9 | which accompanies this distribution. The full text of the license may be found at\r | |
15c952e7 | 10 | http://opensource.org/licenses/bsd-license.php.\r |
e1f414b6 | 11 | \r |
12 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
13 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
14 | \r | |
e1f414b6 | 15 | **/\r |
16 | \r | |
1efcc4ae | 17 | \r |
f734a10a | 18 | \r |
e1f414b6 | 19 | \r |
20 | #include "MemLibInternals.h"\r | |
21 | \r | |
22 | /**\r | |
23 | Copy Length bytes from Source to Destination.\r | |
24 | \r | |
15c952e7 | 25 | @param DestinationBuffer The target of the copy request.\r |
26 | @param SourceBuffer The place to copy from.\r | |
27 | @param Length The number of bytes to copy.\r | |
e1f414b6 | 28 | \r |
29 | @return Destination\r | |
30 | \r | |
31 | **/\r | |
32 | VOID *\r | |
33 | EFIAPI\r | |
34 | InternalMemCopyMem (\r | |
efb23117 | 35 | OUT VOID *DestinationBuffer,\r |
36 | IN CONST VOID *SourceBuffer,\r | |
e1f414b6 | 37 | IN UINTN Length\r |
38 | )\r | |
39 | {\r | |
40 | //\r | |
41 | // Declare the local variables that actually move the data elements as\r | |
42 | // volatile to prevent the optimizer from replacing this function with\r | |
43 | // the intrinsic memcpy()\r | |
44 | //\r | |
45 | volatile UINT8 *Destination8;\r | |
46 | CONST UINT8 *Source8;\r | |
47 | \r | |
efb23117 | 48 | if (SourceBuffer > DestinationBuffer) {\r |
49 | Destination8 = (UINT8*)DestinationBuffer;\r | |
50 | Source8 = (CONST UINT8*)SourceBuffer;\r | |
e1f414b6 | 51 | while (Length-- != 0) {\r |
52 | *(Destination8++) = *(Source8++);\r | |
53 | }\r | |
efb23117 | 54 | } else if (SourceBuffer < DestinationBuffer) {\r |
55 | Destination8 = (UINT8*)DestinationBuffer + Length;\r | |
56 | Source8 = (CONST UINT8*)SourceBuffer + Length;\r | |
e1f414b6 | 57 | while (Length-- != 0) {\r |
58 | *(--Destination8) = *(--Source8);\r | |
59 | }\r | |
60 | }\r | |
efb23117 | 61 | return DestinationBuffer;\r |
e1f414b6 | 62 | }\r |