[mirror_edk2.git] / MdePkg / Library / BaseMemoryLibMmx / Ia32 / SetMem.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:
#
#   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), %ecx              # ecx <- Count
    movl    8(%esp), %edi               # edi <- Buffer
    movl    %ecx, %edx
    shrl    $3, %ecx                    # # of Qwords to set
    movb    16(%esp), %al               # al <- Value
    jz      @SetBytes
    movb    %al, %ah                    # ax <- Value | (Value << 8)
    pushl   %ecx
    pushl   %ecx
    movq    %mm0, (%esp)                # save mm0
    movd    %eax, %mm0
    pshufw  $0x0,%mm0,%mm0
L0: 
    movntq  %mm0, (%edi)
    addl    $8, %edi
    loop    L0
    mfence
    movq    (%esp), %mm0                # restore mm0
    popl    %ecx                        # stack cleanup
    popl    %ecx
@SetBytes: 
    andl    $7, %edx
    movl    %edx, %ecx
    rep
    stosb
    movl    8(%esp), %eax               # eax <- Buffer as return value
    pop     %edi
    ret
Commit	Line	Data
6e3b8c47	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	# SetMem.asm
	15	#
	16	# Abstract:
	17	#
	18	# SetMem function
	19	#
	20	# Notes:
	21	#
	22	#------------------------------------------------------------------------------
	23
	24	.686:
	25	#.MODEL flat,C
	26	.xmm:
	27	.code:
	28
	29	#------------------------------------------------------------------------------
	30	# VOID *
	31	# _mem_SetMem (
	32	# IN VOID *Buffer,
	33	# IN UINTN Count,
	34	# IN UINT8 Value
	35	# )
	36	#------------------------------------------------------------------------------
	37	.global _InternalMemSetMem
	38	_InternalMemSetMem:
	39	push %edi
	40	movl 12(%esp), %ecx # ecx <- Count
	41	movl 8(%esp), %edi # edi <- Buffer
	42	movl %ecx, %edx
	43	shrl $3, %ecx # # of Qwords to set
	44	movb 16(%esp), %al # al <- Value
	45	jz @SetBytes
	46	movb %al, %ah # ax <- Value \| (Value << 8)
	47	pushl %ecx
	48	pushl %ecx
	49	movq %mm0, (%esp) # save mm0
	50	movd %eax, %mm0
	51	pshufw $0x0,%mm0,%mm0
	52	L0:
	53	movntq %mm0, (%edi)
	54	addl $8, %edi
	55	loop L0
	56	mfence
	57	movq (%esp), %mm0 # restore mm0
	58	popl %ecx # stack cleanup
	59	popl %ecx
	60	@SetBytes:
	61	andl $7, %edx
	62	movl %edx, %ecx
	63	rep
	64	stosb
65	movl 8(%esp), %eax # eax <- Buffer as return value
66	pop %edi
67	ret