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

;

; 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:

;

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

.code

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

; VOID *

; InternalMemZeroMem (

; IN VOID *Buffer,

; IN UINTN Count

; )

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

InternalMemZeroMem PROC USES rdi

mov rdi, rcx

xor rcx, rcx

xor eax, eax

sub rcx, rdi

and rcx, 15

mov r8, rdi

jz @F

cmp rcx, rdx

cmova rcx, rdx

sub rdx, rcx

rep stosb

@@:

mov rcx, rdx

and edx, 15

shr rcx, 4

jz @ZeroBytes

pxor xmm0, xmm0

@@:

movntdq [rdi], xmm0 ; rdi should be 16-byte aligned

add rdi, 16

loop @B

mfence

@ZeroBytes:

mov ecx, edx

rep stosb

mov rax, r8

ret

InternalMemZeroMem ENDP

END