;------------------------------------------------------------------------------ | |
; | |
; 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 | |