MdePkg/Library/BaseMemoryLibSse2/Ia32/ZeroMem.S File Reference
Detailed Description
#------------------------------------------------------------------------------
#
# 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.asm
#
# Abstract:
#
# ZeroMem function
#
# Notes:
#
#------------------------------------------------------------------------------
ASM_GLOBAL
ASM_PFX(InternalMemZeroMem)
#------------------------------------------------------------------------------
# VOID *
# EFIAPI
# InternalMemZeroMem (
# IN VOID *Buffer,
# IN UINTN Count
# );
#------------------------------------------------------------------------------
ASM_PFX(InternalMemZeroMem):
push edi
movl 8(esp), edi
movl 12(esp), edx
xorl ecx, ecx
subl edi, ecx
xorl eax, eax
andl $15, ecx
jz L0
cmpl edx, ecx
cmova edx, ecx
subl ecx, edx
rep
stosb
L0:
movl edx, ecx
andl $15, edx
shrl $4, ecx
jz L_ZeroBytes
pxor xmm0, xmm0
L1:
movntdq xmm0, (edi)
addl $16, edi
loop L1
mfence
L_ZeroBytes:
movl edx, ecx
rep
stosb
movl 8(esp), eax
pop edi
ret