[mirror_edk2.git] / MdePkg / Library / BaseMemoryLibSse2 / ia32 / ZeroMem.s

#------------------------------------------------------------------------------
#
# 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:
#
#   ZeroMem.asm
#
# Abstract:
#
#   ZeroMem function
#
# Notes:
#
#------------------------------------------------------------------------------

    .686: 
    #.MODEL flat,C
    .xmm: 
    .code: 

#------------------------------------------------------------------------------
#  VOID *
#  _mem_ZeroMem (
#    IN VOID   *Buffer,
#    IN UINTN  Count
#    )
#------------------------------------------------------------------------------
.global _InternalMemZeroMem
_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      @ZeroBytes
    pxor    %xmm0, %xmm0
L1: 
    movntdq %xmm0, (%edi)
    addl    $16, %edi
    loop    L1
    mfence
@ZeroBytes: 
    movl    %edx, %ecx
    rep
    stosb
    movl    8(%esp), %eax
    pop     %edi
    ret
Commit	Line	Data
3bc2b3af	1	#------------------------------------------------------------------------------
	2	#
	3	# Copyright (c) 2006, Intel Corporation
	4	# All rights reserved. This program and the accompanying materials
	5	# are licensed and made available under the terms and conditions of the BSD License
	6	# which accompanies this distribution. The full text of the license may be found at
	7	# http://opensource.org/licenses/bsd-license.php
	8	#
	9	# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
	10	# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
	11	#
	12	# Module Name:
	13	#
	14	# ZeroMem.asm
	15	#
	16	# Abstract:
	17	#
	18	# ZeroMem function
	19	#
	20	# Notes:
	21	#
	22	#------------------------------------------------------------------------------
	23
	24	.686:
	25	#.MODEL flat,C
	26	.xmm:
	27	.code:
	28
	29	#------------------------------------------------------------------------------
	30	# VOID *
	31	# _mem_ZeroMem (
	32	# IN VOID *Buffer,
	33	# IN UINTN Count
	34	# )
	35	#------------------------------------------------------------------------------
	36	.global _InternalMemZeroMem
	37	_InternalMemZeroMem:
	38	push %edi
	39	movl 8(%esp), %edi
	40	movl 12(%esp), %edx
	41	xorl %ecx, %ecx
	42	subl %edi, %ecx
	43	xorl %eax, %eax
	44	andl $15, %ecx
	45	jz L0
	46	cmpl %edx, %ecx
	47	cmova %edx, %ecx
	48	subl %ecx, %edx
	49	rep
	50	stosb
	51	L0:
	52	movl %edx, %ecx
	53	andl $15, %edx
	54	shrl $4, %ecx
	55	jz @ZeroBytes
	56	pxor %xmm0, %xmm0
	57	L1:
	58	movntdq %xmm0, (%edi)
	59	addl $16, %edi
	60	loop L1
	61	mfence
	62	@ZeroBytes:
	63	movl %edx, %ecx
	64	rep
65	stosb
66	movl 8(%esp), %eax
67	pop %edi
68	ret