;------------------------------------------------------------------------------

;

; Copyright (c) 2006, 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:

;

; CopyMem.Asm

;

; Abstract:

;

; CopyMem function

;

; Notes:

;

;------------------------------------------------------------------------------

.386

.model flat,C

.code

;------------------------------------------------------------------------------

; VOID *

; InternalMemCopyMem (

; IN VOID *Destination,

; IN VOID *Source,

; IN UINTN Count

; )

;------------------------------------------------------------------------------

InternalMemCopyMem PROC USES esi edi

mov esi, [esp+16] ; esi <- Source

mov edi, [esp+12] ; edi <- Destination

mov edx, [esp+20] ; 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:

mov eax, [esp + 12] ; eax <- Destination as return value

ret

InternalMemCopyMem ENDP

END