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;------------------------------------------------------------------------------
;
; 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.nasm
;
; Abstract:
;
; CopyMem function
;
; Notes:
;
;------------------------------------------------------------------------------
SECTION .text
;------------------------------------------------------------------------------
; VOID *
; EFIAPI
; InternalMemCopyMem (
; IN VOID *Destination,
; IN VOID *Source,
; IN UINTN Count
; );
;------------------------------------------------------------------------------
global ASM_PFX(InternalMemCopyMem)
ASM_PFX(InternalMemCopyMem):
push esi
push edi
mov esi, [esp + 16] ; esi <- Source
mov edi, [esp + 12] ; edi <- Destination
mov edx, [esp + 20] ; edx <- Count
lea eax, [esi + edx - 1] ; eax <- End of Source
cmp esi, edi
jae .0
cmp eax, edi ; Overlapped?
jae @CopyBackward ; Copy backward if overlapped
.0:
mov ecx, edx
and edx, 7
shr ecx, 3 ; ecx <- # of Qwords to copy
jz @CopyBytes
push eax
push eax
movq [esp], mm0 ; save mm0
.1:
movq mm0, [esi]
movq [edi], mm0
add esi, 8
add edi, 8
loop .1
movq mm0, [esp] ; restore mm0
pop ecx ; stack cleanup
pop ecx ; stack cleanup
jmp @CopyBytes
@CopyBackward:
mov esi, eax ; esi <- Last byte in Source
lea edi, [edi + edx - 1] ; edi <- Last byte in Destination
std
@CopyBytes:
mov ecx, edx
rep movsb
cld
mov eax, [esp + 12]
pop edi
pop esi
ret
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