[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:
#
#------------------------------------------------------------------------------

.globl _InternalMemZeroMem

#------------------------------------------------------------------------------
#  VOID *
#  EFIAPI
#  InternalMemZeroMem (
#    IN VOID   *Buffer,
#    IN UINTN  Count
#    );
#------------------------------------------------------------------------------
_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
Commit	Line	Data
f1baef62	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	.globl _InternalMemZeroMem
	25
	26	#------------------------------------------------------------------------------
	27	# VOID *
	28	# EFIAPI
	29	# InternalMemZeroMem (
	30	# IN VOID *Buffer,
	31	# IN UINTN Count
	32	# );
	33	#------------------------------------------------------------------------------
	34	_InternalMemZeroMem:
	35	push %edi
	36	movl 8(%esp), %edi
	37	movl 12(%esp), %edx
	38	xorl %ecx, %ecx
	39	subl %edi, %ecx
	40	xorl %eax, %eax
	41	andl $15, %ecx
	42	jz L0
	43	cmpl %edx, %ecx
	44	cmova %edx, %ecx
	45	subl %ecx, %edx
	46	rep
	47	stosb
	48	L0:
	49	movl %edx, %ecx
	50	andl $15, %edx
	51	shrl $4, %ecx
	52	jz L_ZeroBytes
	53	pxor %xmm0, %xmm0
	54	L1:
	55	movntdq %xmm0, (%edi)
	56	addl $16, %edi
	57	loop L1
	58	mfence
	59	L_ZeroBytes:
	60	movl %edx, %ecx
	61	rep
	62	stosb
	63	movl 8(%esp), %eax
	64	pop %edi
65	ret