15c952e728
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@10597 6f19259b-4bc3-4df7-8a09-765794883524
63 lines
2.0 KiB
C
63 lines
2.0 KiB
C
/** @file
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Implementation of the InternalMemCopyMem routine. This function is broken
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out into its own source file so that it can be excluded from a build for a
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particular platform easily if an optimized version is desired.
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Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>
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This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php.
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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#include "MemLibInternals.h"
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/**
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Copy Length bytes from Source to Destination.
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@param DestinationBuffer The target of the copy request.
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@param SourceBuffer The place to copy from.
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@param Length The number of bytes to copy.
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@return Destination
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**/
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VOID *
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EFIAPI
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InternalMemCopyMem (
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OUT VOID *DestinationBuffer,
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IN CONST VOID *SourceBuffer,
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IN UINTN Length
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)
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{
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//
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// Declare the local variables that actually move the data elements as
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// volatile to prevent the optimizer from replacing this function with
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// the intrinsic memcpy()
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//
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volatile UINT8 *Destination8;
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CONST UINT8 *Source8;
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if (SourceBuffer > DestinationBuffer) {
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Destination8 = (UINT8*)DestinationBuffer;
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Source8 = (CONST UINT8*)SourceBuffer;
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while (Length-- != 0) {
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*(Destination8++) = *(Source8++);
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}
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} else if (SourceBuffer < DestinationBuffer) {
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Destination8 = (UINT8*)DestinationBuffer + Length;
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Source8 = (CONST UINT8*)SourceBuffer + Length;
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while (Length-- != 0) {
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*(--Destination8) = *(--Source8);
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}
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}
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return DestinationBuffer;
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}
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