2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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
32 #ifndef _SYS_ATOMIC_COMMON_H_
33 #define _SYS_ATOMIC_COMMON_H_
35 #ifndef _MACHINE_ATOMIC_H_
36 #error do not include this header, use machine/atomic.h
39 #include <sys/cdefs.h>
40 #include <sys/types.h>
42 #define __atomic_load_char_relaxed(p) (*(volatile u_char *)(p))
43 #define __atomic_load_short_relaxed(p) (*(volatile u_short *)(p))
44 #define __atomic_load_int_relaxed(p) (*(volatile u_int *)(p))
45 #define __atomic_load_long_relaxed(p) (*(volatile u_long *)(p))
46 #define __atomic_load_8_relaxed(p) (*(volatile uint8_t *)(p))
47 #define __atomic_load_16_relaxed(p) (*(volatile uint16_t *)(p))
48 #define __atomic_load_32_relaxed(p) (*(volatile uint32_t *)(p))
49 #define __atomic_load_64_relaxed(p) (*(volatile uint64_t *)(p))
51 #define __atomic_store_char_relaxed(p, v) \
52 (*(volatile u_char *)(p) = (u_char)(v))
53 #define __atomic_store_short_relaxed(p, v) \
54 (*(volatile u_short *)(p) = (u_short)(v))
55 #define __atomic_store_int_relaxed(p, v) \
56 (*(volatile u_int *)(p) = (u_int)(v))
57 #define __atomic_store_long_relaxed(p, v) \
58 (*(volatile u_long *)(p) = (u_long)(v))
59 #define __atomic_store_8_relaxed(p, v) \
60 (*(volatile uint8_t *)(p) = (uint8_t)(v))
61 #define __atomic_store_16_relaxed(p, v) \
62 (*(volatile uint16_t *)(p) = (uint16_t)(v))
63 #define __atomic_store_32_relaxed(p, v) \
64 (*(volatile uint32_t *)(p) = (uint32_t)(v))
65 #define __atomic_store_64_relaxed(p, v) \
66 (*(volatile uint64_t *)(p) = (uint64_t)(v))
69 * When _Generic is available, try to provide some type checking.
71 #if (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L) || \
72 __has_extension(c_generic_selections)
73 #define __atomic_load_generic(p, t, ut, n) \
75 t: __atomic_load_ ## n ## _relaxed(p), ut: __atomic_load_ ## n ## _relaxed(p))
76 #define __atomic_store_generic(p, v, t, ut, n) \
78 t: __atomic_store_ ## n ## _relaxed(p, v), ut: __atomic_store_ ## n ## _relaxed(p, v))
80 #define __atomic_load_generic(p, t, ut, n) __atomic_load_ ## n ## _relaxed(p)
81 #define __atomic_store_generic(p, v, t, ut, n) __atomic_store_ ## n ## _relaxed(p, v)
84 #define atomic_load_char(p) __atomic_load_generic(p, char, u_char, char)
85 #define atomic_load_short(p) __atomic_load_generic(p, short, u_short, short)
86 #define atomic_load_int(p) __atomic_load_generic(p, int, u_int, int)
87 #define atomic_load_long(p) __atomic_load_generic(p, long, u_long, long)
88 #define atomic_load_8(p) __atomic_load_generic(p, int8_t, uint8_t, 8)
89 #define atomic_load_16(p) __atomic_load_generic(p, int16_t, uint16_t, 16)
90 #define atomic_load_32(p) __atomic_load_generic(p, int32_t, uint32_t, 32)
92 #define atomic_load_64(p) __atomic_load_generic(p, int64_t, uint64_t, 64)
94 #define atomic_store_char(p, v) \
95 __atomic_store_generic(p, v, char, u_char, char)
96 #define atomic_store_short(p, v) \
97 __atomic_store_generic(p, v, short, u_short, short)
98 #define atomic_store_int(p, v) \
99 __atomic_store_generic(p, v, int, u_int, int)
100 #define atomic_store_long(p, v) \
101 __atomic_store_generic(p, v, long, u_long, long)
102 #define atomic_store_8(p, v) \
103 __atomic_store_generic(p, v, int8_t, uint8_t, 8)
104 #define atomic_store_16(p, v) \
105 __atomic_store_generic(p, v, int16_t, uint16_t, 16)
106 #define atomic_store_32(p, v) \
107 __atomic_store_generic(p, v, int32_t, uint32_t, 32)
109 #define atomic_store_64(p, v) \
110 __atomic_store_generic(p, v, int64_t, uint64_t, 64)
113 #define atomic_load_ptr(p) (*(volatile __typeof(*p) *)(p))
114 #define atomic_store_ptr(p, v) (*(volatile __typeof(*p) *)(p) = (v))
117 * Currently all architectures provide acquire and release fences on their own,
118 * but they don't provide consume. Kludge below allows relevant code to stop
119 * openly resorting to the stronger acquire fence, to be sorted out.
121 #define atomic_load_consume_ptr(p) \
122 ((__typeof(*p)) atomic_load_acq_ptr((uintptr_t *)p))
124 #define atomic_interrupt_fence() __compiler_membar()