MdePkg/Library/BaseMemoryLibSse2/Ia32/SetMem.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:
#
#
SetMem.asm
#
# Abstract:
#
# SetMem function
#
# Notes:
#
#------------------------------------------------------------------------------
#.MODEL flat,C
.xmm:
.code:
#------------------------------------------------------------------------------
# VOID *
# _mem_SetMem (
# IN VOID *Buffer,
# IN UINTN Count,
# IN UINT8 Value
# );
#------------------------------------------------------------------------------
ASM_GLOBAL
ASM_PFX(InternalMemSetMem)
ASM_PFX(InternalMemSetMem):
push edi
movl 12(esp), edx # edx <- Count
movl 8(esp), edi # edi <- Buffer
movb 16(esp), al # al <- Value
xorl ecx, ecx
subl edi, ecx
andl $15, ecx # ecx + edi aligns on 16-byte boundary
jz L0
cmpl edx, ecx
cmova edx, ecx
subl ecx, edx
rep
stosb
L0:
movl edx, ecx
andl $15, edx
shrl $4, ecx # ecx <- # of DQwords to set
jz L_SetBytes
movb al, ah # ax <- Value | (Value << 8)
addl $-16, esp
movdqu xmm0, (esp)
movd eax, xmm0
pshuflw $0, xmm0, xmm0
movlhps xmm0, xmm0
L1:
movntdq xmm0, (edi)
addl $16, edi
loop L1
mfence
movdqu (esp), xmm0
addl $16, esp # stack cleanup
L_SetBytes:
movl edx, ecx
rep
stosb
movl 8(esp), eax # eax <- Buffer as return value
pop edi
ret