;------------------------------------------------------------------------------ | |
; | |
; Copyright (c) 2006, Intel Corporation. All rights reserved.<BR> | |
; SPDX-License-Identifier: BSD-2-Clause-Patent | |
; | |
; 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, 63 | |
mov r8, rdi | |
jz .0 | |
cmp rcx, rdx | |
cmova rcx, rdx | |
sub rdx, rcx | |
rep stosb | |
.0: | |
mov rcx, rdx | |
and edx, 63 | |
shr rcx, 6 | |
jz @ZeroBytes | |
pxor xmm0, xmm0 | |
.1: | |
movntdq [rdi], xmm0 | |
movntdq [rdi + 16], xmm0 | |
movntdq [rdi + 32], xmm0 | |
movntdq [rdi + 48], xmm0 | |
add rdi, 64 | |
loop .1 | |
mfence | |
@ZeroBytes: | |
mov ecx, edx | |
rep stosb | |
mov rax, r8 | |
pop rdi | |
ret | |