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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.nasm
;
; Abstract:
;
; ZeroMem function
;
; Notes:
;
;------------------------------------------------------------------------------
DEFAULT REL
SECTION .text
;------------------------------------------------------------------------------
; VOID *
; InternalMemZeroMem (
; IN VOID *Buffer,
; IN UINTN Count
; )
;------------------------------------------------------------------------------
global ASM_PFX(InternalMemZeroMem)
ASM_PFX(InternalMemZeroMem):
push rdi
mov rdi, rcx
xor rcx, rcx
xor eax, eax
sub rcx, rdi
and rcx, 15
mov r8, rdi
jz .0
cmp rcx, rdx
cmova rcx, rdx
sub rdx, rcx
rep stosb
.0:
mov rcx, rdx
and edx, 15
shr rcx, 4
jz @ZeroBytes
pxor xmm0, xmm0
.1:
movntdq [rdi], xmm0 ; rdi should be 16-byte aligned
add rdi, 16
loop .1
mfence
@ZeroBytes:
mov ecx, edx
rep stosb
mov rax, r8
pop rdi
ret
|
