# | |
# ConvertAsm.py: Automatically generated from ZeroMem.asm | |
# | |
#------------------------------------------------------------------------------ | |
# | |
# Copyright (c) 2006 - 2008, Intel Corporation | |
# All rights reserved. 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.S | |
# | |
# Abstract: | |
# | |
# ZeroMem function | |
# | |
# Notes: | |
# | |
#------------------------------------------------------------------------------ | |
#------------------------------------------------------------------------------ | |
# VOID * | |
# InternalMemZeroMem ( | |
# IN VOID *Buffer, | |
# IN UINTN Count | |
# ); | |
#------------------------------------------------------------------------------ | |
.intel_syntax noprefix | |
ASM_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 L0 | |
cmp rcx, rdx | |
cmova rcx, rdx | |
sub rdx, rcx | |
rep stosb | |
L0: | |
mov rcx, rdx | |
and edx, 15 | |
shr rcx, 4 | |
jz L_ZeroBytes | |
pxor xmm0, xmm0 | |
L1: | |
movntdq [rdi], xmm0 # rdi should be 16-byte aligned | |
add rdi, 16 | |
loop L1 | |
mfence | |
L_ZeroBytes: | |
mov ecx, edx | |
rep stosb | |
mov rax, r8 | |
pop rdi | |
ret |