Add in the 1st version of ECP.
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@2832 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
@@ -0,0 +1,81 @@
|
||||
;------------------------------------------------------------------------------
|
||||
;
|
||||
; 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:
|
||||
;
|
||||
; CopyMem.asm
|
||||
;
|
||||
; Abstract:
|
||||
;
|
||||
; memcpy function
|
||||
;
|
||||
; Notes:
|
||||
;
|
||||
;------------------------------------------------------------------------------
|
||||
|
||||
.686
|
||||
.model flat,C
|
||||
.mmx
|
||||
.code
|
||||
|
||||
;------------------------------------------------------------------------------
|
||||
; VOID *
|
||||
; memcpy (
|
||||
; IN VOID *Destination,
|
||||
; IN VOID *Source,
|
||||
; IN UINTN Count
|
||||
; );
|
||||
;------------------------------------------------------------------------------
|
||||
memcpy PROC USES esi 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
|
||||
je @CopyMemDone
|
||||
cmp edx, 0
|
||||
je @CopyMemDone
|
||||
cmp esi, edi
|
||||
jae @F
|
||||
cmp eax, edi ; Overlapped?
|
||||
jae @CopyBackward ; Copy backward if overlapped
|
||||
@@:
|
||||
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
|
||||
@@:
|
||||
movq mm0, [esi]
|
||||
movq [edi], mm0
|
||||
add esi, 8
|
||||
add edi, 8
|
||||
loop @B
|
||||
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
|
||||
@CopyMemDone:
|
||||
mov eax, [esp + 12]
|
||||
ret
|
||||
memcpy ENDP
|
||||
|
||||
END
|
Reference in New Issue
Block a user