1/* SPDX-License-Identifier: GPL-2.0 */
 2/* atomic.h: Thankfully the V9 is at least reasonable for this
 3 *           stuff.
 4 *
 5 * Copyright (C) 1996, 1997, 2000, 2012 David S. Miller (davem@redhat.com)
 6 */
 7
 8#ifndef __ARCH_SPARC64_ATOMIC__
 9#define __ARCH_SPARC64_ATOMIC__
10
11#include <linux/types.h>
12#include <asm/cmpxchg.h>
13#include <asm/barrier.h>
14
15#define ATOMIC_INIT(i)		{ (i) }
16#define ATOMIC64_INIT(i)	{ (i) }
17
18#define atomic_read(v)		READ_ONCE((v)->counter)
19#define atomic64_read(v)	READ_ONCE((v)->counter)
20
21#define atomic_set(v, i)	WRITE_ONCE(((v)->counter), (i))
22#define atomic64_set(v, i)	WRITE_ONCE(((v)->counter), (i))
23
24#define ATOMIC_OP(op)							\
25void atomic_##op(int, atomic_t *);					\
26void atomic64_##op(s64, atomic64_t *);
27
28#define ATOMIC_OP_RETURN(op)						\
29int atomic_##op##_return(int, atomic_t *);				\
30s64 atomic64_##op##_return(s64, atomic64_t *);
31
32#define ATOMIC_FETCH_OP(op)						\
33int atomic_fetch_##op(int, atomic_t *);					\
34s64 atomic64_fetch_##op(s64, atomic64_t *);
35
36#define ATOMIC_OPS(op) ATOMIC_OP(op) ATOMIC_OP_RETURN(op) ATOMIC_FETCH_OP(op)
37
38ATOMIC_OPS(add)
39ATOMIC_OPS(sub)
40
41#undef ATOMIC_OPS
42#define ATOMIC_OPS(op) ATOMIC_OP(op) ATOMIC_FETCH_OP(op)
43
44ATOMIC_OPS(and)
45ATOMIC_OPS(or)
46ATOMIC_OPS(xor)
47
48#undef ATOMIC_OPS
49#undef ATOMIC_FETCH_OP
50#undef ATOMIC_OP_RETURN
51#undef ATOMIC_OP
52
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
53#define atomic_cmpxchg(v, o, n) (cmpxchg(&((v)->counter), (o), (n)))
 
54
55static inline int atomic_xchg(atomic_t *v, int new)
56{
57	return xchg(&v->counter, new);
 
 
 
 
 
 
 
 
 
 
58}
59
60#define atomic64_cmpxchg(v, o, n) \
61	((__typeof__((v)->counter))cmpxchg(&((v)->counter), (o), (n)))
62#define atomic64_xchg(v, new) (xchg(&((v)->counter), new))
63
64s64 atomic64_dec_if_positive(atomic64_t *v);
65#define atomic64_dec_if_positive atomic64_dec_if_positive
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
66
67#endif /* !(__ARCH_SPARC64_ATOMIC__) */

 
  1/* atomic.h: Thankfully the V9 is at least reasonable for this
  2 *           stuff.
  3 *
  4 * Copyright (C) 1996, 1997, 2000, 2012 David S. Miller (davem@redhat.com)
  5 */
  6
  7#ifndef __ARCH_SPARC64_ATOMIC__
  8#define __ARCH_SPARC64_ATOMIC__
  9
 10#include <linux/types.h>
 11#include <asm/cmpxchg.h>
 12#include <asm/barrier.h>
 13
 14#define ATOMIC_INIT(i)		{ (i) }
 15#define ATOMIC64_INIT(i)	{ (i) }
 16
 17#define atomic_read(v)		READ_ONCE((v)->counter)
 18#define atomic64_read(v)	READ_ONCE((v)->counter)
 19
 20#define atomic_set(v, i)	WRITE_ONCE(((v)->counter), (i))
 21#define atomic64_set(v, i)	WRITE_ONCE(((v)->counter), (i))
 22
 23#define ATOMIC_OP(op)							\
 24void atomic_##op(int, atomic_t *);					\
 25void atomic64_##op(long, atomic64_t *);
 26
 27#define ATOMIC_OP_RETURN(op)						\
 28int atomic_##op##_return(int, atomic_t *);				\
 29long atomic64_##op##_return(long, atomic64_t *);
 30
 31#define ATOMIC_OPS(op) ATOMIC_OP(op) ATOMIC_OP_RETURN(op)
 
 
 
 
 32
 33ATOMIC_OPS(add)
 34ATOMIC_OPS(sub)
 35
 36ATOMIC_OP(and)
 37ATOMIC_OP(or)
 38ATOMIC_OP(xor)
 
 
 
 39
 40#undef ATOMIC_OPS
 
 41#undef ATOMIC_OP_RETURN
 42#undef ATOMIC_OP
 43
 44#define atomic_dec_return(v)   atomic_sub_return(1, v)
 45#define atomic64_dec_return(v) atomic64_sub_return(1, v)
 46
 47#define atomic_inc_return(v)   atomic_add_return(1, v)
 48#define atomic64_inc_return(v) atomic64_add_return(1, v)
 49
 50/*
 51 * atomic_inc_and_test - increment and test
 52 * @v: pointer of type atomic_t
 53 *
 54 * Atomically increments @v by 1
 55 * and returns true if the result is zero, or false for all
 56 * other cases.
 57 */
 58#define atomic_inc_and_test(v) (atomic_inc_return(v) == 0)
 59#define atomic64_inc_and_test(v) (atomic64_inc_return(v) == 0)
 60
 61#define atomic_sub_and_test(i, v) (atomic_sub_return(i, v) == 0)
 62#define atomic64_sub_and_test(i, v) (atomic64_sub_return(i, v) == 0)
 63
 64#define atomic_dec_and_test(v) (atomic_sub_return(1, v) == 0)
 65#define atomic64_dec_and_test(v) (atomic64_sub_return(1, v) == 0)
 66
 67#define atomic_inc(v) atomic_add(1, v)
 68#define atomic64_inc(v) atomic64_add(1, v)
 69
 70#define atomic_dec(v) atomic_sub(1, v)
 71#define atomic64_dec(v) atomic64_sub(1, v)
 72
 73#define atomic_add_negative(i, v) (atomic_add_return(i, v) < 0)
 74#define atomic64_add_negative(i, v) (atomic64_add_return(i, v) < 0)
 75
 76#define atomic_cmpxchg(v, o, n) (cmpxchg(&((v)->counter), (o), (n)))
 77#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
 78
 79static inline int __atomic_add_unless(atomic_t *v, int a, int u)
 80{
 81	int c, old;
 82	c = atomic_read(v);
 83	for (;;) {
 84		if (unlikely(c == (u)))
 85			break;
 86		old = atomic_cmpxchg((v), c, c + (a));
 87		if (likely(old == c))
 88			break;
 89		c = old;
 90	}
 91	return c;
 92}
 93
 94#define atomic64_cmpxchg(v, o, n) \
 95	((__typeof__((v)->counter))cmpxchg(&((v)->counter), (o), (n)))
 96#define atomic64_xchg(v, new) (xchg(&((v)->counter), new))
 97
 98static inline long atomic64_add_unless(atomic64_t *v, long a, long u)
 99{
100	long c, old;
101	c = atomic64_read(v);
102	for (;;) {
103		if (unlikely(c == (u)))
104			break;
105		old = atomic64_cmpxchg((v), c, c + (a));
106		if (likely(old == c))
107			break;
108		c = old;
109	}
110	return c != (u);
111}
112
113#define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1, 0)
114
115long atomic64_dec_if_positive(atomic64_t *v);
116
117#endif /* !(__ARCH_SPARC64_ATOMIC__) */