mirror of https://github.com/acidanthera/audk.git
74 lines
1.9 KiB
C
74 lines
1.9 KiB
C
|
/*++
|
||
|
|
|
||
|
|
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:
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|