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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:
;
; ZeroMem.asm
;
; Abstract:
;
; ZeroMem function
;
; Notes:
;
;------------------------------------------------------------------------------
.686
.model flat,C
.xmm
.code
;------------------------------------------------------------------------------
; VOID *
; EFIAPI
; InternalMemZeroMem (
; IN VOID *Buffer,
; IN UINTN Count
; );
;------------------------------------------------------------------------------
InternalMemZeroMem PROC USES edi
mov edi, [esp + 8]
mov edx, [esp + 12]
xor ecx, ecx
sub ecx, edi
xor eax, eax
and ecx, 15
jz @F
cmp ecx, edx
cmova ecx, edx
sub edx, ecx
rep stosb
@@:
mov ecx, edx
and edx, 15
shr ecx, 4
jz @ZeroBytes
pxor xmm0, xmm0
@@:
movntdq [edi], xmm0
add edi, 16
loop @B
mfence
@ZeroBytes:
mov ecx, edx
rep stosb
mov eax, [esp + 8]
ret
InternalMemZeroMem ENDP
END
|
