2 * SPDX-License-Identifier: BSD-2-Clause
4 * Copyright (c) 2017 The FreeBSD Foundation
6 * This software was developed by Konstantin Belousov <kib@FreeBSD.org>
7 * under sponsorship from the FreeBSD Foundation.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 #ifndef _SYS_ATOMIC_COMMON_H_
31 #define _SYS_ATOMIC_COMMON_H_
33 #ifndef _MACHINE_ATOMIC_H_
34 #error do not include this header, use machine/atomic.h
37 #include <sys/types.h>
39 #define __atomic_load_bool_relaxed(p) (*(volatile _Bool *)(p))
40 #define __atomic_store_bool_relaxed(p, v) \
41 (*(volatile _Bool *)(p) = (_Bool)(v))
43 #define __atomic_load_char_relaxed(p) (*(volatile u_char *)(p))
44 #define __atomic_load_short_relaxed(p) (*(volatile u_short *)(p))
45 #define __atomic_load_int_relaxed(p) (*(volatile u_int *)(p))
46 #define __atomic_load_long_relaxed(p) (*(volatile u_long *)(p))
47 #define __atomic_load_8_relaxed(p) (*(volatile uint8_t *)(p))
48 #define __atomic_load_16_relaxed(p) (*(volatile uint16_t *)(p))
49 #define __atomic_load_32_relaxed(p) (*(volatile uint32_t *)(p))
50 #define __atomic_load_64_relaxed(p) (*(volatile uint64_t *)(p))
52 #define __atomic_store_char_relaxed(p, v) \
53 (*(volatile u_char *)(p) = (u_char)(v))
54 #define __atomic_store_short_relaxed(p, v) \
55 (*(volatile u_short *)(p) = (u_short)(v))
56 #define __atomic_store_int_relaxed(p, v) \
57 (*(volatile u_int *)(p) = (u_int)(v))
58 #define __atomic_store_long_relaxed(p, v) \
59 (*(volatile u_long *)(p) = (u_long)(v))
60 #define __atomic_store_8_relaxed(p, v) \
61 (*(volatile uint8_t *)(p) = (uint8_t)(v))
62 #define __atomic_store_16_relaxed(p, v) \
63 (*(volatile uint16_t *)(p) = (uint16_t)(v))
64 #define __atomic_store_32_relaxed(p, v) \
65 (*(volatile uint32_t *)(p) = (uint32_t)(v))
66 #define __atomic_store_64_relaxed(p, v) \
67 (*(volatile uint64_t *)(p) = (uint64_t)(v))
70 * When _Generic is available, try to provide some type checking.
72 #if (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L) || \
73 __has_extension(c_generic_selections)
74 #define atomic_load_bool(p) \
75 _Generic(*(p), _Bool: __atomic_load_bool_relaxed(p))
76 #define atomic_store_bool(p, v) \
77 _Generic(*(p), _Bool: __atomic_store_bool_relaxed(p, v))
79 #define __atomic_load_generic(p, t, ut, n) \
81 t: __atomic_load_ ## n ## _relaxed(p), \
82 ut: __atomic_load_ ## n ## _relaxed(p))
83 #define __atomic_store_generic(p, v, t, ut, n) \
85 t: __atomic_store_ ## n ## _relaxed(p, v), \
86 ut: __atomic_store_ ## n ## _relaxed(p, v))
88 #define atomic_load_bool(p) \
89 __atomic_load_bool_relaxed(p)
90 #define atomic_store_bool(p, v) \
91 __atomic_store_bool_relaxed(p, v)
92 #define __atomic_load_generic(p, t, ut, n) \
93 __atomic_load_ ## n ## _relaxed(p)
94 #define __atomic_store_generic(p, v, t, ut, n) \
95 __atomic_store_ ## n ## _relaxed(p, v)
98 #define atomic_load_char(p) __atomic_load_generic(p, char, u_char, char)
99 #define atomic_load_short(p) __atomic_load_generic(p, short, u_short, short)
100 #define atomic_load_int(p) __atomic_load_generic(p, int, u_int, int)
101 #define atomic_load_long(p) __atomic_load_generic(p, long, u_long, long)
102 #define atomic_load_8(p) __atomic_load_generic(p, int8_t, uint8_t, 8)
103 #define atomic_load_16(p) __atomic_load_generic(p, int16_t, uint16_t, 16)
104 #define atomic_load_32(p) __atomic_load_generic(p, int32_t, uint32_t, 32)
106 #define atomic_load_64(p) __atomic_load_generic(p, int64_t, uint64_t, 64)
108 #define atomic_store_char(p, v) \
109 __atomic_store_generic(p, v, char, u_char, char)
110 #define atomic_store_short(p, v) \
111 __atomic_store_generic(p, v, short, u_short, short)
112 #define atomic_store_int(p, v) \
113 __atomic_store_generic(p, v, int, u_int, int)
114 #define atomic_store_long(p, v) \
115 __atomic_store_generic(p, v, long, u_long, long)
116 #define atomic_store_8(p, v) \
117 __atomic_store_generic(p, v, int8_t, uint8_t, 8)
118 #define atomic_store_16(p, v) \
119 __atomic_store_generic(p, v, int16_t, uint16_t, 16)
120 #define atomic_store_32(p, v) \
121 __atomic_store_generic(p, v, int32_t, uint32_t, 32)
123 #define atomic_store_64(p, v) \
124 __atomic_store_generic(p, v, int64_t, uint64_t, 64)
127 #define atomic_load_ptr(p) (*(volatile __typeof(*p) *)(p))
128 #define atomic_store_ptr(p, v) (*(volatile __typeof(*p) *)(p) = (v))
131 * Currently all architectures provide acquire and release fences on their own,
132 * but they don't provide consume. Kludge below allows relevant code to stop
133 * openly resorting to the stronger acquire fence, to be sorted out.
135 #define atomic_load_consume_ptr(p) \
136 ((__typeof(*p)) atomic_load_acq_ptr((uintptr_t *)p))
138 #define atomic_interrupt_fence() __compiler_membar()
140 #endif /* !_SYS_ATOMIC_COMMON_H_ */