diff options
| author | bbahnsen <bbahnsen@6f19259b-4bc3-4df7-8a09-765794883524> | 2006-04-21 22:54:32 +0000 |
|---|---|---|
| committer | bbahnsen <bbahnsen@6f19259b-4bc3-4df7-8a09-765794883524> | 2006-04-21 22:54:32 +0000 |
| commit | 878ddf1fc3540a715f63594ed22b6929e881afb4 (patch) | |
| tree | c56c44dac138137b510e1fba7c3efe5e4d84bea2 /MdePkg/Library/BaseMemoryLib/CopyMem.c | |
| download | edk2-platforms-878ddf1fc3540a715f63594ed22b6929e881afb4.tar.xz | |
Initial import.
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@3 6f19259b-4bc3-4df7-8a09-765794883524
Diffstat (limited to 'MdePkg/Library/BaseMemoryLib/CopyMem.c')
| -rw-r--r-- | MdePkg/Library/BaseMemoryLib/CopyMem.c | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/MdePkg/Library/BaseMemoryLib/CopyMem.c b/MdePkg/Library/BaseMemoryLib/CopyMem.c new file mode 100644 index 0000000000..f2106acb18 --- /dev/null +++ b/MdePkg/Library/BaseMemoryLib/CopyMem.c @@ -0,0 +1,60 @@ +/** @file
+ Implementation of the EfiCopyMem routine. This function is broken
+ out into its own source file so that it can be excluded from a
+ build for a particular platform easily if an optimized version
+ is desired.
+
+ Copyright (c) 2006, Intel Corporation<BR>
+ 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: EfiCopyMem.c
+
+**/
+
+/**
+ 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;
+}
|