mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-28 07:04:00 +08:00
304a0d699a
Implement atomic logic ops -- atomic_{or,xor,and}.
These will replace the atomic_{set,clear}_mask functions that are
available on some archs.
Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
111 lines
2.6 KiB
ArmAsm
111 lines
2.6 KiB
ArmAsm
/* atomic.S: These things are too big to do inline.
|
|
*
|
|
* Copyright (C) 1999, 2007 2012 David S. Miller (davem@davemloft.net)
|
|
*/
|
|
|
|
#include <linux/linkage.h>
|
|
#include <asm/asi.h>
|
|
#include <asm/backoff.h>
|
|
|
|
.text
|
|
|
|
/* Two versions of the atomic routines, one that
|
|
* does not return a value and does not perform
|
|
* memory barriers, and a second which returns
|
|
* a value and does the barriers.
|
|
*/
|
|
|
|
#define ATOMIC_OP(op) \
|
|
ENTRY(atomic_##op) /* %o0 = increment, %o1 = atomic_ptr */ \
|
|
BACKOFF_SETUP(%o2); \
|
|
1: lduw [%o1], %g1; \
|
|
op %g1, %o0, %g7; \
|
|
cas [%o1], %g1, %g7; \
|
|
cmp %g1, %g7; \
|
|
bne,pn %icc, BACKOFF_LABEL(2f, 1b); \
|
|
nop; \
|
|
retl; \
|
|
nop; \
|
|
2: BACKOFF_SPIN(%o2, %o3, 1b); \
|
|
ENDPROC(atomic_##op); \
|
|
|
|
#define ATOMIC_OP_RETURN(op) \
|
|
ENTRY(atomic_##op##_return) /* %o0 = increment, %o1 = atomic_ptr */ \
|
|
BACKOFF_SETUP(%o2); \
|
|
1: lduw [%o1], %g1; \
|
|
op %g1, %o0, %g7; \
|
|
cas [%o1], %g1, %g7; \
|
|
cmp %g1, %g7; \
|
|
bne,pn %icc, BACKOFF_LABEL(2f, 1b); \
|
|
op %g1, %o0, %g1; \
|
|
retl; \
|
|
sra %g1, 0, %o0; \
|
|
2: BACKOFF_SPIN(%o2, %o3, 1b); \
|
|
ENDPROC(atomic_##op##_return);
|
|
|
|
#define ATOMIC_OPS(op) ATOMIC_OP(op) ATOMIC_OP_RETURN(op)
|
|
|
|
ATOMIC_OPS(add)
|
|
ATOMIC_OPS(sub)
|
|
ATOMIC_OP(and)
|
|
ATOMIC_OP(or)
|
|
ATOMIC_OP(xor)
|
|
|
|
#undef ATOMIC_OPS
|
|
#undef ATOMIC_OP_RETURN
|
|
#undef ATOMIC_OP
|
|
|
|
#define ATOMIC64_OP(op) \
|
|
ENTRY(atomic64_##op) /* %o0 = increment, %o1 = atomic_ptr */ \
|
|
BACKOFF_SETUP(%o2); \
|
|
1: ldx [%o1], %g1; \
|
|
op %g1, %o0, %g7; \
|
|
casx [%o1], %g1, %g7; \
|
|
cmp %g1, %g7; \
|
|
bne,pn %xcc, BACKOFF_LABEL(2f, 1b); \
|
|
nop; \
|
|
retl; \
|
|
nop; \
|
|
2: BACKOFF_SPIN(%o2, %o3, 1b); \
|
|
ENDPROC(atomic64_##op); \
|
|
|
|
#define ATOMIC64_OP_RETURN(op) \
|
|
ENTRY(atomic64_##op##_return) /* %o0 = increment, %o1 = atomic_ptr */ \
|
|
BACKOFF_SETUP(%o2); \
|
|
1: ldx [%o1], %g1; \
|
|
op %g1, %o0, %g7; \
|
|
casx [%o1], %g1, %g7; \
|
|
cmp %g1, %g7; \
|
|
bne,pn %xcc, BACKOFF_LABEL(2f, 1b); \
|
|
nop; \
|
|
retl; \
|
|
op %g1, %o0, %o0; \
|
|
2: BACKOFF_SPIN(%o2, %o3, 1b); \
|
|
ENDPROC(atomic64_##op##_return);
|
|
|
|
#define ATOMIC64_OPS(op) ATOMIC64_OP(op) ATOMIC64_OP_RETURN(op)
|
|
|
|
ATOMIC64_OPS(add)
|
|
ATOMIC64_OPS(sub)
|
|
ATOMIC64_OP(and)
|
|
ATOMIC64_OP(or)
|
|
ATOMIC64_OP(xor)
|
|
|
|
#undef ATOMIC64_OPS
|
|
#undef ATOMIC64_OP_RETURN
|
|
#undef ATOMIC64_OP
|
|
|
|
ENTRY(atomic64_dec_if_positive) /* %o0 = atomic_ptr */
|
|
BACKOFF_SETUP(%o2)
|
|
1: ldx [%o0], %g1
|
|
brlez,pn %g1, 3f
|
|
sub %g1, 1, %g7
|
|
casx [%o0], %g1, %g7
|
|
cmp %g1, %g7
|
|
bne,pn %xcc, BACKOFF_LABEL(2f, 1b)
|
|
nop
|
|
3: retl
|
|
sub %g1, 1, %o0
|
|
2: BACKOFF_SPIN(%o2, %o3, 1b)
|
|
ENDPROC(atomic64_dec_if_positive)
|