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

.global _InternalMemSetMem

#------------------------------------------------------------------------------
#  VOID *
#  InternalMemSetMem (
#    IN VOID   *Buffer,
#    IN UINTN  Count,
#    IN UINT8  Value
#    )
#------------------------------------------------------------------------------
_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    $0x-10, %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
    loopl   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
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
eb227e96	24	.global _InternalMemSetMem
6e3b8c47	25
	26	#------------------------------------------------------------------------------
	27	# VOID *
eb227e96	28	# InternalMemSetMem (
6e3b8c47	29	# IN VOID *Buffer,
	30	# IN UINTN Count,
	31	# IN UINT8 Value
	32	# )
	33	#------------------------------------------------------------------------------
6e3b8c47	34	_InternalMemSetMem:
6e3b8c47	35	push %edi
eb227e96	36	movb 16(%esp), %al
	37	movb %al, %ah
	38	shrdl $16, %eax, %edx
	39	shldl $16, %edx, %eax
6e3b8c47	40	movl 12(%esp), %ecx # ecx <- Count
	41	movl 8(%esp), %edi # edi <- Buffer
	42	movl %ecx, %edx
eb227e96	43	andl $7, %edx
6e3b8c47	44	shrl $3, %ecx # # of Qwords to set
eb227e96	45	jz L1
eb227e96	46	addl $0x-10, %esp
6e3b8c47	47	movq %mm0, (%esp) # save mm0
eb227e96	48	movq %mm1, 8(%esp) # save mm1
6e3b8c47	49	movd %eax, %mm0
eb227e96	50	movd %eax, %mm1
	51	psllq $32, %mm0
	52	por %mm1, %mm0 # fill mm0 with 8 Value's
	53	L0:
	54	movq %mm0, (%edi)
6e3b8c47	55	addl $8, %edi
eb227e96	56	loopl L0
6e3b8c47	57	movq (%esp), %mm0 # restore mm0
eb227e96	58	movq 8(%esp), %mm1 # restore mm1
	59	addl $0x10, %esp # stack cleanup
	60	L1:
6e3b8c47	61	movl %edx, %ecx
	62	rep
	63	stosb
	64	movl 8(%esp), %eax # eax <- Buffer as return value
	65	pop %edi
	66	ret