bitops.S
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/*
* Based on arch/arm/lib/bitops.h
*
* Copyright (C) 2013 ARM Ltd.
*
* 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 distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <linux/linkage.h>
#include <asm/assembler.h>
#include <asm/lse.h>
/*
* x0: bits 5:0 bit offset
* bits 31:6 word offset
* x1: address
*/
.macro bitop, name, llsc, lse
ENTRY( \name )
and w3, w0, #63 // Get bit offset
eor w0, w0, w3 // Clear low bits
mov x2, #1
add x1, x1, x0, lsr #3 // Get word offset
alt_lse " prfm pstl1strm, [x1]", "nop"
lsl x3, x2, x3 // Create mask
alt_lse "1: ldxr x2, [x1]", "\lse x3, [x1]"
alt_lse " \llsc x2, x2, x3", "nop"
alt_lse " stxr w0, x2, [x1]", "nop"
alt_lse " cbnz w0, 1b", "nop"
ret
ENDPROC(\name )
.endm
.macro testop, name, llsc, lse
ENTRY( \name )
and w3, w0, #63 // Get bit offset
eor w0, w0, w3 // Clear low bits
mov x2, #1
add x1, x1, x0, lsr #3 // Get word offset
alt_lse " prfm pstl1strm, [x1]", "nop"
lsl x4, x2, x3 // Create mask
alt_lse "1: ldxr x2, [x1]", "\lse x4, x2, [x1]"
lsr x0, x2, x3
alt_lse " \llsc x2, x2, x4", "nop"
alt_lse " stlxr w5, x2, [x1]", "nop"
alt_lse " cbnz w5, 1b", "nop"
alt_lse " dmb ish", "nop"
and x0, x0, #1
ret
ENDPROC(\name )
.endm
/*
* Atomic bit operations.
*/
bitop change_bit, eor, steor
bitop clear_bit, bic, stclr
bitop set_bit, orr, stset
testop test_and_change_bit, eor, ldeoral
testop test_and_clear_bit, bic, ldclral
testop test_and_set_bit, orr, ldsetal