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 #if defined(__i386__) && (defined(_KERNEL) || defined(KLD_MODULE))
36 #define I386_HAVE_ATOMIC64
39 #if defined(__i386__) || defined(__amd64__) || defined(__arm__)
40 /* No spurious failures from fcmpset. */
41 #define STRONG_FCMPSET
44 #if !defined(__LP64__) && !defined(__mips_n32) && \
45 !defined(ARM_HAVE_ATOMIC64) && !defined(I386_HAVE_ATOMIC64) && \
46 !defined(HAS_EMULATED_ATOMIC64)
47 extern void atomic_add_64(volatile uint64_t *target, int64_t delta);
48 extern void atomic_dec_64(volatile uint64_t *target);
49 extern uint64_t atomic_swap_64(volatile uint64_t *a, uint64_t value);
50 extern uint64_t atomic_load_64(volatile uint64_t *a);
51 extern uint64_t atomic_add_64_nv(volatile uint64_t *target, int64_t delta);
52 extern uint64_t atomic_cas_64(volatile uint64_t *target, uint64_t cmp,
56 #define membar_producer atomic_thread_fence_rel
58 static __inline uint32_t
59 atomic_add_32_nv(volatile uint32_t *target, int32_t delta)
61 return (atomic_fetchadd_32(target, delta) + delta);
65 atomic_add_int_nv(volatile u_int *target, int delta)
67 return (atomic_add_32_nv(target, delta));
71 atomic_inc_32(volatile uint32_t *target)
73 atomic_add_32(target, 1);
76 static __inline uint32_t
77 atomic_inc_32_nv(volatile uint32_t *target)
79 return (atomic_add_32_nv(target, 1));
83 atomic_dec_32(volatile uint32_t *target)
85 atomic_subtract_32(target, 1);
88 static __inline uint32_t
89 atomic_dec_32_nv(volatile uint32_t *target)
91 return (atomic_add_32_nv(target, -1));
94 static inline uint32_t
95 atomic_cas_32(volatile uint32_t *target, uint32_t cmp, uint32_t newval)
98 (void)atomic_fcmpset_32(target, &cmp, newval);
100 uint32_t expected = cmp;
103 if (atomic_fcmpset_32(target, &cmp, newval))
105 } while (cmp == expected);
110 #if defined(__LP64__) || defined(__mips_n32) || \
111 defined(ARM_HAVE_ATOMIC64) || defined(I386_HAVE_ATOMIC64) || \
112 defined(HAS_EMULATED_ATOMIC64)
114 atomic_dec_64(volatile uint64_t *target)
116 atomic_subtract_64(target, 1);
119 static inline uint64_t
120 atomic_add_64_nv(volatile uint64_t *target, int64_t delta)
122 return (atomic_fetchadd_64(target, delta) + delta);
125 static inline uint64_t
126 atomic_cas_64(volatile uint64_t *target, uint64_t cmp, uint64_t newval)
128 #ifdef STRONG_FCMPSET
129 (void)atomic_fcmpset_64(target, &cmp, newval);
131 uint64_t expected = cmp;
134 if (atomic_fcmpset_64(target, &cmp, newval))
136 } while (cmp == expected);
143 atomic_inc_64(volatile uint64_t *target)
145 atomic_add_64(target, 1);
148 static __inline uint64_t
149 atomic_inc_64_nv(volatile uint64_t *target)
151 return (atomic_add_64_nv(target, 1));
154 static __inline uint64_t
155 atomic_dec_64_nv(volatile uint64_t *target)
157 return (atomic_add_64_nv(target, -1));
160 #if !defined(COMPAT_32BIT) && defined(__LP64__)
161 static __inline void *
162 atomic_cas_ptr(volatile void *target, void *cmp, void *newval)
164 return ((void *)atomic_cas_64((volatile uint64_t *)target,
165 (uint64_t)cmp, (uint64_t)newval));
168 static __inline void *
169 atomic_cas_ptr(volatile void *target, void *cmp, void *newval)
171 return ((void *)atomic_cas_32((volatile uint32_t *)target,
172 (uint32_t)cmp, (uint32_t)newval));
174 #endif /* !defined(COMPAT_32BIT) && defined(__LP64__) */
176 #endif /* !_OPENSOLARIS_SYS_ATOMIC_H_ */