mirror of https://github.com/acidanthera/audk.git
80 lines
2.1 KiB
C
80 lines
2.1 KiB
C
/*++
|
|
|
|
Copyright (c) 2007, Intel Corporation. All rights reserved.<BR>
|
|
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:
|
|
|
|
EfiCopyMemRep4.c
|
|
|
|
Abstract:
|
|
|
|
This is the code that uses rep movsd 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 _CopyDWord
|
|
cmp eax, edi
|
|
jae _CopyBackward ; Copy backward if overlapped
|
|
_CopyDWord:
|
|
mov ecx, edx
|
|
and edx, 3
|
|
shr ecx, 2
|
|
rep movsd ; Copy as many Dwords as possible
|
|
jmp _CopyBytes
|
|
_CopyBackward:
|
|
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:
|
|
}
|
|
}
|