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_
34 #include <sys/types.h>
35 #include <machine/atomic.h>
37 #define atomic_sub_64 atomic_subtract_64
39 #if defined(__i386__) && (defined(_KERNEL) || defined(KLD_MODULE))
40 #define I386_HAVE_ATOMIC64
43 #if defined(__i386__) || defined(__amd64__) || defined(__arm__)
44 /* No spurious failures from fcmpset. */
45 #define STRONG_FCMPSET
48 #if !defined(__LP64__) && !defined(__mips_n32) && \
49 !defined(ARM_HAVE_ATOMIC64) && !defined(I386_HAVE_ATOMIC64) && \
50 !defined(HAS_EMULATED_ATOMIC64)
51 extern void atomic_add_64(volatile uint64_t *target, int64_t delta);
52 extern void atomic_dec_64(volatile uint64_t *target);
53 extern uint64_t atomic_swap_64(volatile uint64_t *a, uint64_t value);
54 extern uint64_t atomic_load_64(volatile uint64_t *a);
55 extern uint64_t atomic_add_64_nv(volatile uint64_t *target, int64_t delta);
56 extern uint64_t atomic_cas_64(volatile uint64_t *target, uint64_t cmp,
60 #define membar_producer atomic_thread_fence_rel
62 static __inline uint32_t
63 atomic_add_32_nv(volatile uint32_t *target, int32_t delta)
65 return (atomic_fetchadd_32(target, delta) + delta);
68 static __inline uint_t
69 atomic_add_int_nv(volatile uint_t *target, int delta)
71 return (atomic_add_32_nv(target, delta));
75 atomic_inc_32(volatile uint32_t *target)
77 atomic_add_32(target, 1);
80 static __inline uint32_t
81 atomic_inc_32_nv(volatile uint32_t *target)
83 return (atomic_add_32_nv(target, 1));
87 atomic_dec_32(volatile uint32_t *target)
89 atomic_subtract_32(target, 1);
92 static __inline uint32_t
93 atomic_dec_32_nv(volatile uint32_t *target)
95 return (atomic_add_32_nv(target, -1));
99 static inline uint32_t
100 atomic_cas_32(volatile uint32_t *target, uint32_t cmp, uint32_t newval)
102 #ifdef STRONG_FCMPSET
103 (void) atomic_fcmpset_32(target, &cmp, newval);
105 uint32_t expected = cmp;
108 if (atomic_fcmpset_32(target, &cmp, newval))
110 } while (cmp == expected);
116 #if defined(__LP64__) || defined(__mips_n32) || \
117 defined(ARM_HAVE_ATOMIC64) || defined(I386_HAVE_ATOMIC64) || \
118 defined(HAS_EMULATED_ATOMIC64)
120 atomic_dec_64(volatile uint64_t *target)
122 atomic_subtract_64(target, 1);
125 static inline uint64_t
126 atomic_add_64_nv(volatile uint64_t *target, int64_t delta)
128 return (atomic_fetchadd_64(target, delta) + delta);
132 static inline uint64_t
133 atomic_cas_64(volatile uint64_t *target, uint64_t cmp, uint64_t newval)
135 #ifdef STRONG_FCMPSET
136 (void) atomic_fcmpset_64(target, &cmp, newval);
138 uint64_t expected = cmp;
141 if (atomic_fcmpset_64(target, &cmp, newval))
143 } while (cmp == expected);
151 atomic_inc_64(volatile uint64_t *target)
153 atomic_add_64(target, 1);
156 static __inline uint64_t
157 atomic_inc_64_nv(volatile uint64_t *target)
159 return (atomic_add_64_nv(target, 1));
162 static __inline uint64_t
163 atomic_dec_64_nv(volatile uint64_t *target)
165 return (atomic_add_64_nv(target, -1));
168 #if !defined(COMPAT_32BIT) && defined(__LP64__)
169 static __inline void *
170 atomic_cas_ptr(volatile void *target, void *cmp, void *newval)
172 return ((void *)atomic_cas_64((volatile uint64_t *)target,
173 (uint64_t)cmp, (uint64_t)newval));
176 static __inline void *
177 atomic_cas_ptr(volatile void *target, void *cmp, void *newval)
179 return ((void *)atomic_cas_32((volatile uint32_t *)target,
180 (uint32_t)cmp, (uint32_t)newval));
182 #endif /* !defined(COMPAT_32BIT) && defined(__LP64__) */
184 #else /* _STANDALONE */
186 * sometimes atomic_add_64 is defined, sometimes not, but the
187 * following is always right for the boot loader.
190 #define atomic_add_64(ptr, val) *(ptr) += val
191 #endif /* !_STANDALONE */
193 #endif /* !_OPENSOLARIS_SYS_ATOMIC_H_ */