projects / mirror_edk2.git / blame
| Commit | Line | Data |
|---|---|---|
| d39eb83c | 1 | /** @file\r |
| 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 | |
| 5 | \r | |
| d6ebcab7 HT |
6 | Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>\r |
| 7 | This program and the accompanying materials\r | |
| d39eb83c | 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 | |
| 10 | http://opensource.org/licenses/bsd-license.php\r | |
| 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 | |
| 15 | **/\r | |
| 16 | \r | |
| 17 | \r | |
| 18 | \r | |
| 19 | \r | |
| 20 | #include "MemLibInternals.h"\r | |
| 21 | \r | |
| 22 | /**\r | |
| 23 | Copy Length bytes from Source to Destination.\r | |
| 24 | \r | |
| 25 | @param DestinationBuffer Target of copy\r | |
| 26 | @param SourceBuffer Place to copy from\r | |
| 27 | @param Length Number of bytes to copy\r | |
| 28 | \r | |
| 29 | @return Destination\r | |
| 30 | \r | |
| 31 | **/\r | |
| 32 | VOID *\r | |
| 33 | EFIAPI\r | |
| 34 | InternalMemCopyMem (\r | |
| 35 | OUT VOID *DestinationBuffer,\r | |
| 36 | IN CONST VOID *SourceBuffer,\r | |
| 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 | |
| 48 | if (SourceBuffer > DestinationBuffer) {\r | |
| 49 | Destination8 = (UINT8*)DestinationBuffer;\r | |
| 50 | Source8 = (CONST UINT8*)SourceBuffer;\r | |
| 51 | while (Length-- != 0) {\r | |
| 52 | *(Destination8++) = *(Source8++);\r | |
| 53 | }\r | |
| 54 | } else if (SourceBuffer < DestinationBuffer) {\r | |
| 55 | Destination8 = (UINT8*)DestinationBuffer + Length;\r | |
| 56 | Source8 = (CONST UINT8*)SourceBuffer + Length;\r | |
| 57 | while (Length-- != 0) {\r | |
| 58 | *(--Destination8) = *(--Source8);\r | |
| 59 | }\r | |
| 60 | }\r | |
| 61 | return DestinationBuffer;\r | |
| 62 | }\r |