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#------------------------------------------------------------------------------
#
# Copyright (c) 2006, 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:
#
#------------------------------------------------------------------------------
.686:
#.MODEL flat,C
.xmm:
.code:
#------------------------------------------------------------------------------
# VOID *
# _mem_SetMem (
# IN VOID *Buffer,
# IN UINTN Count,
# IN UINT8 Value
# )
#------------------------------------------------------------------------------
.global _InternalMemSetMem
_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 @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
@SetBytes:
movl %edx, %ecx
rep
stosb
movl 8(%esp), %eax # eax <- Buffer as return value
pop %edi
ret
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