diff options
Diffstat (limited to 'EDK/Foundation/Library/EdkIIGlueLib/Library/BaseMemoryLib/Ipf/CopyMem.c')
-rw-r--r-- | EDK/Foundation/Library/EdkIIGlueLib/Library/BaseMemoryLib/Ipf/CopyMem.c | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/EDK/Foundation/Library/EdkIIGlueLib/Library/BaseMemoryLib/Ipf/CopyMem.c b/EDK/Foundation/Library/EdkIIGlueLib/Library/BaseMemoryLib/Ipf/CopyMem.c new file mode 100644 index 0000000..17ea273 --- /dev/null +++ b/EDK/Foundation/Library/EdkIIGlueLib/Library/BaseMemoryLib/Ipf/CopyMem.c @@ -0,0 +1,65 @@ +/*++ + +Copyright (c) 2004 - 2006, 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: + + CopyMem.c + +Abstract: + + Internal CopyMem + +--*/ + +#include "BaseMemoryLibInternal.h" + +/** + Copy Length bytes from Source to Destination. + + @param Destination Target of copy + @param Source Place to copy from + @param Length Number of bytes to copy + + @return Destination + +**/ +VOID * +EFIAPI +InternalMemCopyMem ( + OUT VOID *Destination, + IN CONST VOID *Source, + IN UINTN Length + ) +{ + // + // Declare the local variables that actually move the data elements as + // volatile to prevent the optimizer from replacing this function with + // the intrinsic memcpy() + // + volatile UINT8 *Destination8; + CONST UINT8 *Source8; + + if (Source > Destination) { + Destination8 = (UINT8*)Destination; + Source8 = (CONST UINT8*)Source; + while (Length-- != 0) { + *(Destination8++) = *(Source8++); + } + } else if (Source < Destination) { + Destination8 = (UINT8*)Destination + Length; + Source8 = (CONST UINT8*)Source + Length; + while (Length-- != 0) { + *(--Destination8) = *(--Source8); + } + } + return Destination; +} |