diff options
Diffstat (limited to 'EdkCompatibilityPkg/Foundation/Library/EfiCommonLib/Ia32/EfiCopyMemRep1.c')
| -rw-r--r-- | EdkCompatibilityPkg/Foundation/Library/EfiCommonLib/Ia32/EfiCopyMemRep1.c | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/EdkCompatibilityPkg/Foundation/Library/EfiCommonLib/Ia32/EfiCopyMemRep1.c b/EdkCompatibilityPkg/Foundation/Library/EfiCommonLib/Ia32/EfiCopyMemRep1.c new file mode 100644 index 0000000000..3b4804f15d --- /dev/null +++ b/EdkCompatibilityPkg/Foundation/Library/EfiCommonLib/Ia32/EfiCopyMemRep1.c @@ -0,0 +1,73 @@ +/*++
+
+Copyright (c) 2007, 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:
+
+ EfiCopyMemRep1.c
+
+Abstract:
+
+ This is the code that uses rep movsb CopyMem service
+
+--*/
+
+#include "Tiano.h"
+
+VOID
+EfiCommonLibCopyMem (
+ IN VOID *Destination,
+ IN VOID *Source,
+ IN UINTN Count
+ )
+/*++
+
+Routine Description:
+
+ Copy Length bytes from Source to Destination.
+
+Arguments:
+
+ Destination - Target of copy
+
+ Source - Place to copy from
+
+ Length - Number of bytes to copy
+
+Returns:
+
+ None
+
+--*/
+{
+ __asm {
+ mov esi, Source ; esi <- Source
+ mov edi, Destination ; edi <- Destination
+ mov edx, Count ; edx <- Count
+ cmp esi, edi
+ je _CopyDone
+ cmp edx, 0
+ je _CopyDone
+ lea eax, [esi + edx - 1] ; eax <- End of Source
+ cmp esi, edi
+ jae _CopyBytes
+ cmp eax, edi
+ jb _CopyBytes ; Copy backward if overlapped
+ mov esi, eax ; esi <- End of Source
+ lea edi, [edi + edx - 1] ; edi <- End of Destination
+ std
+_CopyBytes:
+ mov ecx, edx
+ rep movsb ; Copy bytes backward
+ cld
+_CopyDone:
+ }
+}
+
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