2 * Copyright (c) 2007 Pawel Jakub Dawidek <pjd@FreeBSD.org>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 #ifndef _OPENSOLARIS_SYS_ATOMIC_H_
30 #define _OPENSOLARIS_SYS_ATOMIC_H_
32 #include <sys/types.h>
33 #include <machine/atomic.h>
35 #define atomic_sub_64 atomic_subtract_64
37 #if defined(__i386__) && (defined(_KERNEL) || defined(KLD_MODULE))
38 #define I386_HAVE_ATOMIC64
41 #if defined(__i386__) || defined(__amd64__) || defined(__arm__)
42 /* No spurious failures from fcmpset. */
43 #define STRONG_FCMPSET
46 #if !defined(__LP64__) && !defined(__mips_n32) && \
47 !defined(ARM_HAVE_ATOMIC64) && !defined(I386_HAVE_ATOMIC64) && \
48 !defined(HAS_EMULATED_ATOMIC64)
49 extern void atomic_add_64(volatile uint64_t *target, int64_t delta);
50 extern void atomic_dec_64(volatile uint64_t *target);
51 extern uint64_t atomic_swap_64(volatile uint64_t *a, uint64_t value);
52 extern uint64_t atomic_load_64(volatile uint64_t *a);
53 extern uint64_t atomic_add_64_nv(volatile uint64_t *target, int64_t delta);
54 extern uint64_t atomic_cas_64(volatile uint64_t *target, uint64_t cmp,
58 #define membar_producer atomic_thread_fence_rel
60 static __inline uint32_t
61 atomic_add_32_nv(volatile uint32_t *target, int32_t delta)
63 return (atomic_fetchadd_32(target, delta) + delta);
66 static __inline uint_t
67 atomic_add_int_nv(volatile uint_t *target, int delta)
69 return (atomic_add_32_nv(target, delta));
73 atomic_inc_32(volatile uint32_t *target)
75 atomic_add_32(target, 1);
78 static __inline uint32_t
79 atomic_inc_32_nv(volatile uint32_t *target)
81 return (atomic_add_32_nv(target, 1));
85 atomic_dec_32(volatile uint32_t *target)
87 atomic_subtract_32(target, 1);
90 static __inline uint32_t
91 atomic_dec_32_nv(volatile uint32_t *target)
93 return (atomic_add_32_nv(target, -1));
97 static inline uint32_t
98 atomic_cas_32(volatile uint32_t *target, uint32_t cmp, uint32_t newval)
100 #ifdef STRONG_FCMPSET
101 (void) atomic_fcmpset_32(target, &cmp, newval);
103 uint32_t expected = cmp;
106 if (atomic_fcmpset_32(target, &cmp, newval))
108 } while (cmp == expected);
114 #if defined(__LP64__) || defined(__mips_n32) || \
115 defined(ARM_HAVE_ATOMIC64) || defined(I386_HAVE_ATOMIC64) || \
116 defined(HAS_EMULATED_ATOMIC64)
118 atomic_dec_64(volatile uint64_t *target)
120 atomic_subtract_64(target, 1);
123 static inline uint64_t
124 atomic_add_64_nv(volatile uint64_t *target, int64_t delta)
126 return (atomic_fetchadd_64(target, delta) + delta);
130 static inline uint64_t
131 atomic_cas_64(volatile uint64_t *target, uint64_t cmp, uint64_t newval)
133 #ifdef STRONG_FCMPSET
134 (void) atomic_fcmpset_64(target, &cmp, newval);
136 uint64_t expected = cmp;
139 if (atomic_fcmpset_64(target, &cmp, newval))
141 } while (cmp == expected);
149 atomic_inc_64(volatile uint64_t *target)
151 atomic_add_64(target, 1);
154 static __inline uint64_t
155 atomic_inc_64_nv(volatile uint64_t *target)
157 return (atomic_add_64_nv(target, 1));
160 static __inline uint64_t
161 atomic_dec_64_nv(volatile uint64_t *target)
163 return (atomic_add_64_nv(target, -1));
166 #if !defined(COMPAT_32BIT) && defined(__LP64__)
167 static __inline void *
168 atomic_cas_ptr(volatile void *target, void *cmp, void *newval)
170 return ((void *)atomic_cas_64((volatile uint64_t *)target,
171 (uint64_t)cmp, (uint64_t)newval));
174 static __inline void *
175 atomic_cas_ptr(volatile void *target, void *cmp, void *newval)
177 return ((void *)atomic_cas_32((volatile uint32_t *)target,
178 (uint32_t)cmp, (uint32_t)newval));
180 #endif /* !defined(COMPAT_32BIT) && defined(__LP64__) */
182 #endif /* !_OPENSOLARIS_SYS_ATOMIC_H_ */