1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 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 #ifndef _SYS_ATOMIC_COMMON_H_ 31 #define _SYS_ATOMIC_COMMON_H_ 32 33 #ifndef _MACHINE_ATOMIC_H_ 34 #error do not include this header, use machine/atomic.h 35 #endif 36 37 #include <sys/types.h> 38 39 #define __atomic_load_bool_relaxed(p) (*(volatile _Bool *)(p)) 40 #define __atomic_store_bool_relaxed(p, v) \ 41 (*(volatile _Bool *)(p) = (_Bool)(v)) 42 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)) 51 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)) 68 69 /* 70 * When _Generic is available, try to provide some type checking. 71 */ 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)) 78 79 #define __atomic_load_generic(p, t, ut, n) \ 80 _Generic(*(p), \ 81 t: __atomic_load_ ## n ## _relaxed(p), \ 82 ut: __atomic_load_ ## n ## _relaxed(p)) 83 #define __atomic_store_generic(p, v, t, ut, n) \ 84 _Generic(*(p), \ 85 t: __atomic_store_ ## n ## _relaxed(p, v), \ 86 ut: __atomic_store_ ## n ## _relaxed(p, v)) 87 #else 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) 96 #endif 97 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) 105 #ifdef __LP64__ 106 #define atomic_load_64(p) __atomic_load_generic(p, int64_t, uint64_t, 64) 107 #endif 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) 122 #ifdef __LP64__ 123 #define atomic_store_64(p, v) \ 124 __atomic_store_generic(p, v, int64_t, uint64_t, 64) 125 #endif 126 127 #define atomic_load_ptr(p) (*(volatile __typeof(*p) *)(p)) 128 #define atomic_store_ptr(p, v) (*(volatile __typeof(*p) *)(p) = (v)) 129 130 /* 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. 134 */ 135 #define atomic_load_consume_ptr(p) \ 136 ((__typeof(*p)) atomic_load_acq_ptr((uintptr_t *)p)) 137 138 #define atomic_interrupt_fence() __compiler_membar() 139 140 #endif /* !_SYS_ATOMIC_COMMON_H_ */ 141