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;------------------------------------------------------------------------------
;
; Copyright (c) 2006, Intel Corporation. All rights reserved.<BR>
; SPDX-License-Identifier: BSD-2-Clause-Patent
;
; Module Name:
;
; ZeroMem.nasm
;
; Abstract:
;
; ZeroMem function
;
; Notes:
;
;------------------------------------------------------------------------------
SECTION .text
;------------------------------------------------------------------------------
; VOID *
; EFIAPI
; InternalMemZeroMem (
; IN VOID *Buffer,
; IN UINTN Count
; );
;------------------------------------------------------------------------------
global ASM_PFX(InternalMemZeroMem)
ASM_PFX(InternalMemZeroMem):
push edi
mov edi, [esp + 8]
mov edx, [esp + 12]
xor ecx, ecx
sub ecx, edi
xor eax, eax
and ecx, 63
jz .0
cmp ecx, edx
cmova ecx, edx
sub edx, ecx
rep stosb
.0:
mov ecx, edx
and edx, 63
shr ecx, 6
jz @ZeroBytes
pxor xmm0, xmm0
.1:
movntdq [edi], xmm0
movntdq [edi + 16], xmm0
movntdq [edi + 32], xmm0
movntdq [edi + 48], xmm0
add edi, 64
loop .1
mfence
@ZeroBytes:
mov ecx, edx
rep stosb
mov eax, [esp + 8]
pop edi
ret
|
