1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2017 The FreeBSD Foundation 5 * 6 * This software was developed by Konstantin Belousov <kib@FreeBSD.org> 7 * under sponsorship from the FreeBSD Foundation. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 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. 17 * 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 28 * SUCH DAMAGE. 29 * 30 * $FreeBSD$ 31 */ 32 #ifndef _SYS_ATOMIC_COMMON_H_ 33 #define _SYS_ATOMIC_COMMON_H_ 34 35 #ifndef _MACHINE_ATOMIC_H_ 36 #error do not include this header, use machine/atomic.h 37 #endif 38 39 #include <sys/cdefs.h> 40 #include <sys/types.h> 41 42 #define __atomic_load_bool_relaxed(p) (*(volatile _Bool *)(p)) 43 #define __atomic_store_bool_relaxed(p, v) \ 44 (*(volatile _Bool *)(p) = (_Bool)(v)) 45 46 #define __atomic_load_char_relaxed(p) (*(volatile u_char *)(p)) 47 #define __atomic_load_short_relaxed(p) (*(volatile u_short *)(p)) 48 #define __atomic_load_int_relaxed(p) (*(volatile u_int *)(p)) 49 #define __atomic_load_long_relaxed(p) (*(volatile u_long *)(p)) 50 #define __atomic_load_8_relaxed(p) (*(volatile uint8_t *)(p)) 51 #define __atomic_load_16_relaxed(p) (*(volatile uint16_t *)(p)) 52 #define __atomic_load_32_relaxed(p) (*(volatile uint32_t *)(p)) 53 #define __atomic_load_64_relaxed(p) (*(volatile uint64_t *)(p)) 54 55 #define __atomic_store_char_relaxed(p, v) \ 56 (*(volatile u_char *)(p) = (u_char)(v)) 57 #define __atomic_store_short_relaxed(p, v) \ 58 (*(volatile u_short *)(p) = (u_short)(v)) 59 #define __atomic_store_int_relaxed(p, v) \ 60 (*(volatile u_int *)(p) = (u_int)(v)) 61 #define __atomic_store_long_relaxed(p, v) \ 62 (*(volatile u_long *)(p) = (u_long)(v)) 63 #define __atomic_store_8_relaxed(p, v) \ 64 (*(volatile uint8_t *)(p) = (uint8_t)(v)) 65 #define __atomic_store_16_relaxed(p, v) \ 66 (*(volatile uint16_t *)(p) = (uint16_t)(v)) 67 #define __atomic_store_32_relaxed(p, v) \ 68 (*(volatile uint32_t *)(p) = (uint32_t)(v)) 69 #define __atomic_store_64_relaxed(p, v) \ 70 (*(volatile uint64_t *)(p) = (uint64_t)(v)) 71 72 /* 73 * When _Generic is available, try to provide some type checking. 74 */ 75 #if (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L) || \ 76 __has_extension(c_generic_selections) 77 #define atomic_load_bool(p) \ 78 _Generic(*(p), _Bool: __atomic_load_bool_relaxed(p)) 79 #define atomic_store_bool(p, v) \ 80 _Generic(*(p), _Bool: __atomic_store_bool_relaxed(p, v)) 81 82 #define __atomic_load_generic(p, t, ut, n) \ 83 _Generic(*(p), \ 84 t: __atomic_load_ ## n ## _relaxed(p), \ 85 ut: __atomic_load_ ## n ## _relaxed(p)) 86 #define __atomic_store_generic(p, v, t, ut, n) \ 87 _Generic(*(p), \ 88 t: __atomic_store_ ## n ## _relaxed(p, v), \ 89 ut: __atomic_store_ ## n ## _relaxed(p, v)) 90 #else 91 #define atomic_load_bool(p) \ 92 __atomic_load_bool_relaxed(p) 93 #define atomic_store_bool(p, v) \ 94 __atomic_store_bool_relaxed(p, v) 95 #define __atomic_load_generic(p, t, ut, n) \ 96 __atomic_load_ ## n ## _relaxed(p) 97 #define __atomic_store_generic(p, v, t, ut, n) \ 98 __atomic_store_ ## n ## _relaxed(p, v) 99 #endif 100 101 #define atomic_load_char(p) __atomic_load_generic(p, char, u_char, char) 102 #define atomic_load_short(p) __atomic_load_generic(p, short, u_short, short) 103 #define atomic_load_int(p) __atomic_load_generic(p, int, u_int, int) 104 #define atomic_load_long(p) __atomic_load_generic(p, long, u_long, long) 105 #define atomic_load_8(p) __atomic_load_generic(p, int8_t, uint8_t, 8) 106 #define atomic_load_16(p) __atomic_load_generic(p, int16_t, uint16_t, 16) 107 #define atomic_load_32(p) __atomic_load_generic(p, int32_t, uint32_t, 32) 108 #ifdef __LP64__ 109 #define atomic_load_64(p) __atomic_load_generic(p, int64_t, uint64_t, 64) 110 #endif 111 #define atomic_store_char(p, v) \ 112 __atomic_store_generic(p, v, char, u_char, char) 113 #define atomic_store_short(p, v) \ 114 __atomic_store_generic(p, v, short, u_short, short) 115 #define atomic_store_int(p, v) \ 116 __atomic_store_generic(p, v, int, u_int, int) 117 #define atomic_store_long(p, v) \ 118 __atomic_store_generic(p, v, long, u_long, long) 119 #define atomic_store_8(p, v) \ 120 __atomic_store_generic(p, v, int8_t, uint8_t, 8) 121 #define atomic_store_16(p, v) \ 122 __atomic_store_generic(p, v, int16_t, uint16_t, 16) 123 #define atomic_store_32(p, v) \ 124 __atomic_store_generic(p, v, int32_t, uint32_t, 32) 125 #ifdef __LP64__ 126 #define atomic_store_64(p, v) \ 127 __atomic_store_generic(p, v, int64_t, uint64_t, 64) 128 #endif 129 130 #define atomic_load_ptr(p) (*(volatile __typeof(*p) *)(p)) 131 #define atomic_store_ptr(p, v) (*(volatile __typeof(*p) *)(p) = (v)) 132 133 /* 134 * Currently all architectures provide acquire and release fences on their own, 135 * but they don't provide consume. Kludge below allows relevant code to stop 136 * openly resorting to the stronger acquire fence, to be sorted out. 137 */ 138 #define atomic_load_consume_ptr(p) \ 139 ((__typeof(*p)) atomic_load_acq_ptr((uintptr_t *)p)) 140 141 #define atomic_interrupt_fence() __compiler_membar() 142 143 #endif /* !_SYS_ATOMIC_COMMON_H_ */ 144