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bitops.S
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/* SPDX-License-Identifier: GPL-2.0 */
/* bitops.S: Sparc64 atomic bit operations.
*
* Copyright (C) 2000, 2007 David S. Miller ([email protected])
*/
#include <linux/linkage.h>
#include <asm/asi.h>
#include <asm/backoff.h>
#include <asm/export.h>
.text
ENTRY(test_and_set_bit) /* %o0=nr, %o1=addr */
BACKOFF_SETUP(%o3)
srlx %o0, 6, %g1
mov 1, %o2
sllx %g1, 3, %g3
and %o0, 63, %g2
sllx %o2, %g2, %o2
add %o1, %g3, %o1
1: ldx [%o1], %g7
or %g7, %o2, %g1
casx [%o1], %g7, %g1
cmp %g7, %g1
bne,pn %xcc, BACKOFF_LABEL(2f, 1b)
and %g7, %o2, %g2
clr %o0
movrne %g2, 1, %o0
retl
nop
2: BACKOFF_SPIN(%o3, %o4, 1b)
ENDPROC(test_and_set_bit)
EXPORT_SYMBOL(test_and_set_bit)
ENTRY(test_and_clear_bit) /* %o0=nr, %o1=addr */
BACKOFF_SETUP(%o3)
srlx %o0, 6, %g1
mov 1, %o2
sllx %g1, 3, %g3
and %o0, 63, %g2
sllx %o2, %g2, %o2
add %o1, %g3, %o1
1: ldx [%o1], %g7
andn %g7, %o2, %g1
casx [%o1], %g7, %g1
cmp %g7, %g1
bne,pn %xcc, BACKOFF_LABEL(2f, 1b)
and %g7, %o2, %g2
clr %o0
movrne %g2, 1, %o0
retl
nop
2: BACKOFF_SPIN(%o3, %o4, 1b)
ENDPROC(test_and_clear_bit)
EXPORT_SYMBOL(test_and_clear_bit)
ENTRY(test_and_change_bit) /* %o0=nr, %o1=addr */
BACKOFF_SETUP(%o3)
srlx %o0, 6, %g1
mov 1, %o2
sllx %g1, 3, %g3
and %o0, 63, %g2
sllx %o2, %g2, %o2
add %o1, %g3, %o1
1: ldx [%o1], %g7
xor %g7, %o2, %g1
casx [%o1], %g7, %g1
cmp %g7, %g1
bne,pn %xcc, BACKOFF_LABEL(2f, 1b)
and %g7, %o2, %g2
clr %o0
movrne %g2, 1, %o0
retl
nop
2: BACKOFF_SPIN(%o3, %o4, 1b)
ENDPROC(test_and_change_bit)
EXPORT_SYMBOL(test_and_change_bit)
ENTRY(set_bit) /* %o0=nr, %o1=addr */
BACKOFF_SETUP(%o3)
srlx %o0, 6, %g1
mov 1, %o2
sllx %g1, 3, %g3
and %o0, 63, %g2
sllx %o2, %g2, %o2
add %o1, %g3, %o1
1: ldx [%o1], %g7
or %g7, %o2, %g1
casx [%o1], %g7, %g1
cmp %g7, %g1
bne,pn %xcc, BACKOFF_LABEL(2f, 1b)
nop
retl
nop
2: BACKOFF_SPIN(%o3, %o4, 1b)
ENDPROC(set_bit)
EXPORT_SYMBOL(set_bit)
ENTRY(clear_bit) /* %o0=nr, %o1=addr */
BACKOFF_SETUP(%o3)
srlx %o0, 6, %g1
mov 1, %o2
sllx %g1, 3, %g3
and %o0, 63, %g2
sllx %o2, %g2, %o2
add %o1, %g3, %o1
1: ldx [%o1], %g7
andn %g7, %o2, %g1
casx [%o1], %g7, %g1
cmp %g7, %g1
bne,pn %xcc, BACKOFF_LABEL(2f, 1b)
nop
retl
nop
2: BACKOFF_SPIN(%o3, %o4, 1b)
ENDPROC(clear_bit)
EXPORT_SYMBOL(clear_bit)
ENTRY(change_bit) /* %o0=nr, %o1=addr */
BACKOFF_SETUP(%o3)
srlx %o0, 6, %g1
mov 1, %o2
sllx %g1, 3, %g3
and %o0, 63, %g2
sllx %o2, %g2, %o2
add %o1, %g3, %o1
1: ldx [%o1], %g7
xor %g7, %o2, %g1
casx [%o1], %g7, %g1
cmp %g7, %g1
bne,pn %xcc, BACKOFF_LABEL(2f, 1b)
nop
retl
nop
2: BACKOFF_SPIN(%o3, %o4, 1b)
ENDPROC(change_bit)
EXPORT_SYMBOL(change_bit)