MdePkg/Library/BaseMemoryLibMmx/Ia32/SetMem.S File Reference
Detailed Description
#------------------------------------------------------------------------------
#
# 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:
#
#------------------------------------------------------------------------------
ASM_GLOBAL
ASM_PFX(InternalMemSetMem)
#------------------------------------------------------------------------------
# VOID *
# InternalMemSetMem (
# IN VOID *Buffer,
# IN UINTN Count,
# IN UINT8 Value
# )
#------------------------------------------------------------------------------
ASM_PFX(InternalMemSetMem):
push edi
movb 16(esp), al
movb al, ah
shrdl $16, eax, edx
shldl $16, edx, eax
movl 12(esp), ecx # ecx <- Count
movl 8(esp), edi # edi <- Buffer
movl ecx, edx
andl $7, edx
shrl $3, ecx # # of Qwords to set
jz L1
addl $-16, esp
movq mm0, (esp) # save mm0
movq mm1, 8(esp) # save mm1
movd eax, mm0
movd eax, mm1
psllq $32, mm0
por mm1, mm0 # fill mm0 with 8 Value's
L0:
movq mm0, (edi)
addl $8, edi
loop L0
movq (esp), mm0 # restore mm0
movq 8(esp), mm1 # restore mm1
addl $0x10, esp # stack cleanup
L1:
movl edx, ecx
rep
stosb
movl 8(esp), eax # eax <- Buffer as return value
pop edi
ret