linux/arch/arm/lib/io-writesb.S
Thomas Gleixner d2912cb15b treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
Based on 2 normalized pattern(s):

  this program is free software you can redistribute it and or modify
  it under the terms of the gnu general public license version 2 as
  published by the free software foundation

  this program is free software you can redistribute it and or modify
  it under the terms of the gnu general public license version 2 as
  published by the free software foundation #

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-only

has been chosen to replace the boilerplate/reference in 4122 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Enrico Weigelt <info@metux.net>
Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Reviewed-by: Allison Randal <allison@lohutok.net>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190604081206.933168790@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-06-19 17:09:55 +02:00

92 lines
1.5 KiB
ArmAsm

/* SPDX-License-Identifier: GPL-2.0-only */
/*
* linux/arch/arm/lib/io-writesb.S
*
* Copyright (C) 1995-2000 Russell King
*/
#include <linux/linkage.h>
#include <asm/assembler.h>
.macro outword, rd
#ifndef __ARMEB__
strb \rd, [r0]
mov \rd, \rd, lsr #8
strb \rd, [r0]
mov \rd, \rd, lsr #8
strb \rd, [r0]
mov \rd, \rd, lsr #8
strb \rd, [r0]
#else
mov lr, \rd, lsr #24
strb lr, [r0]
mov lr, \rd, lsr #16
strb lr, [r0]
mov lr, \rd, lsr #8
strb lr, [r0]
strb \rd, [r0]
#endif
.endm
.Loutsb_align: rsb ip, ip, #4
cmp ip, r2
movgt ip, r2
cmp ip, #2
ldrb r3, [r1], #1
strb r3, [r0]
ldrbge r3, [r1], #1
strbge r3, [r0]
ldrbgt r3, [r1], #1
strbgt r3, [r0]
subs r2, r2, ip
bne .Loutsb_aligned
ENTRY(__raw_writesb)
teq r2, #0 @ do we have to check for the zero len?
reteq lr
ands ip, r1, #3
bne .Loutsb_align
.Loutsb_aligned:
stmfd sp!, {r4, r5, lr}
subs r2, r2, #16
bmi .Loutsb_no_16
.Loutsb_16_lp: ldmia r1!, {r3, r4, r5, ip}
outword r3
outword r4
outword r5
outword ip
subs r2, r2, #16
bpl .Loutsb_16_lp
tst r2, #15
ldmfdeq sp!, {r4, r5, pc}
.Loutsb_no_16: tst r2, #8
beq .Loutsb_no_8
ldmia r1!, {r3, r4}
outword r3
outword r4
.Loutsb_no_8: tst r2, #4
beq .Loutsb_no_4
ldr r3, [r1], #4
outword r3
.Loutsb_no_4: ands r2, r2, #3
ldmfdeq sp!, {r4, r5, pc}
cmp r2, #2
ldrb r3, [r1], #1
strb r3, [r0]
ldrbge r3, [r1], #1
strbge r3, [r0]
ldrbgt r3, [r1]
strbgt r3, [r0]
ldmfd sp!, {r4, r5, pc}
ENDPROC(__raw_writesb)