mirror of https://gitee.com/openkylin/linux.git
166 lines
3.1 KiB
ArmAsm
166 lines
3.1 KiB
ArmAsm
/* bitops.S: Sparc64 atomic bit operations.
|
|
*
|
|
* Copyright (C) 2000, 2007 David S. Miller (davem@davemloft.net)
|
|
*/
|
|
|
|
#include <asm/asi.h>
|
|
#include <asm/backoff.h>
|
|
|
|
.text
|
|
|
|
/* On SMP we need to use memory barriers to ensure
|
|
* correct memory operation ordering, nop these out
|
|
* for uniprocessor.
|
|
*/
|
|
|
|
#ifdef CONFIG_SMP
|
|
#define BITOP_PRE_BARRIER membar #StoreLoad | #LoadLoad
|
|
#define BITOP_POST_BARRIER \
|
|
ba,pt %xcc, 80b; \
|
|
membar #StoreLoad | #StoreStore
|
|
|
|
80: retl
|
|
nop
|
|
#else
|
|
#define BITOP_PRE_BARRIER
|
|
#define BITOP_POST_BARRIER
|
|
#endif
|
|
|
|
.globl test_and_set_bit
|
|
.type test_and_set_bit,#function
|
|
test_and_set_bit: /* %o0=nr, %o1=addr */
|
|
BACKOFF_SETUP(%o3)
|
|
BITOP_PRE_BARRIER
|
|
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, 2f
|
|
and %g7, %o2, %g2
|
|
clr %o0
|
|
movrne %g2, 1, %o0
|
|
BITOP_POST_BARRIER
|
|
retl
|
|
nop
|
|
2: BACKOFF_SPIN(%o3, %o4, 1b)
|
|
.size test_and_set_bit, .-test_and_set_bit
|
|
|
|
.globl test_and_clear_bit
|
|
.type test_and_clear_bit,#function
|
|
test_and_clear_bit: /* %o0=nr, %o1=addr */
|
|
BACKOFF_SETUP(%o3)
|
|
BITOP_PRE_BARRIER
|
|
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, 2f
|
|
and %g7, %o2, %g2
|
|
clr %o0
|
|
movrne %g2, 1, %o0
|
|
BITOP_POST_BARRIER
|
|
retl
|
|
nop
|
|
2: BACKOFF_SPIN(%o3, %o4, 1b)
|
|
.size test_and_clear_bit, .-test_and_clear_bit
|
|
|
|
.globl test_and_change_bit
|
|
.type test_and_change_bit,#function
|
|
test_and_change_bit: /* %o0=nr, %o1=addr */
|
|
BACKOFF_SETUP(%o3)
|
|
BITOP_PRE_BARRIER
|
|
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, 2f
|
|
and %g7, %o2, %g2
|
|
clr %o0
|
|
movrne %g2, 1, %o0
|
|
BITOP_POST_BARRIER
|
|
retl
|
|
nop
|
|
2: BACKOFF_SPIN(%o3, %o4, 1b)
|
|
.size test_and_change_bit, .-test_and_change_bit
|
|
|
|
.globl set_bit
|
|
.type set_bit,#function
|
|
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, 2f
|
|
nop
|
|
retl
|
|
nop
|
|
2: BACKOFF_SPIN(%o3, %o4, 1b)
|
|
.size set_bit, .-set_bit
|
|
|
|
.globl clear_bit
|
|
.type clear_bit,#function
|
|
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, 2f
|
|
nop
|
|
retl
|
|
nop
|
|
2: BACKOFF_SPIN(%o3, %o4, 1b)
|
|
.size clear_bit, .-clear_bit
|
|
|
|
.globl change_bit
|
|
.type change_bit,#function
|
|
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, 2f
|
|
nop
|
|
retl
|
|
nop
|
|
2: BACKOFF_SPIN(%o3, %o4, 1b)
|
|
.size change_bit, .-change_bit
|