1/* 2 * Copyright (C) 2014 The Android Open Source Project 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * * Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * * Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in 12 * the documentation and/or other materials provided with the 13 * distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29#ifndef ANDROID_CUTILS_ATOMIC_AARCH64_H 30#define ANDROID_CUTILS_ATOMIC_AARCH64_H 31 32#include <stdint.h> 33 34#ifndef ANDROID_ATOMIC_INLINE 35#define ANDROID_ATOMIC_INLINE inline __attribute__((always_inline)) 36#endif 37 38/* 39 TODOAArch64: Revisit the below functions and check for potential 40 optimizations using assembly code or otherwise. 41*/ 42 43extern ANDROID_ATOMIC_INLINE 44void android_compiler_barrier(void) 45{ 46 __asm__ __volatile__ ("" : : : "memory"); 47} 48 49extern ANDROID_ATOMIC_INLINE 50void android_memory_barrier(void) 51{ 52 __asm__ __volatile__ ("dmb ish" : : : "memory"); 53} 54 55extern ANDROID_ATOMIC_INLINE 56int32_t android_atomic_acquire_load(volatile const int32_t *ptr) 57{ 58 int32_t value = *ptr; 59 android_memory_barrier(); 60 return value; 61} 62 63extern ANDROID_ATOMIC_INLINE 64int32_t android_atomic_release_load(volatile const int32_t *ptr) 65{ 66 android_memory_barrier(); 67 return *ptr; 68} 69 70extern ANDROID_ATOMIC_INLINE 71void android_atomic_acquire_store(int32_t value, volatile int32_t *ptr) 72{ 73 *ptr = value; 74 android_memory_barrier(); 75} 76 77extern ANDROID_ATOMIC_INLINE 78void android_atomic_release_store(int32_t value, volatile int32_t *ptr) 79{ 80 android_memory_barrier(); 81 *ptr = value; 82} 83 84extern ANDROID_ATOMIC_INLINE 85int android_atomic_cas(int32_t old_value, int32_t new_value, 86 volatile int32_t *ptr) 87{ 88 return __sync_val_compare_and_swap(ptr, old_value, new_value) != old_value; 89} 90 91extern ANDROID_ATOMIC_INLINE 92int android_atomic_acquire_cas(int32_t old_value, int32_t new_value, 93 volatile int32_t *ptr) 94{ 95 int status = android_atomic_cas(old_value, new_value, ptr); 96 android_memory_barrier(); 97 return status; 98} 99 100extern ANDROID_ATOMIC_INLINE 101int android_atomic_release_cas(int32_t old_value, int32_t new_value, 102 volatile int32_t *ptr) 103{ 104 android_memory_barrier(); 105 return android_atomic_cas(old_value, new_value, ptr); 106} 107 108extern ANDROID_ATOMIC_INLINE 109int32_t android_atomic_add(int32_t increment, volatile int32_t *ptr) 110{ 111 int32_t prev, status; 112 android_memory_barrier(); 113 do { 114 prev = *ptr; 115 status = android_atomic_cas(prev, prev + increment, ptr); 116 } while (__builtin_expect(status != 0, 0)); 117 return prev; 118} 119 120extern ANDROID_ATOMIC_INLINE 121int32_t android_atomic_inc(volatile int32_t *addr) 122{ 123 return android_atomic_add(1, addr); 124} 125 126extern ANDROID_ATOMIC_INLINE 127int32_t android_atomic_dec(volatile int32_t *addr) 128{ 129 return android_atomic_add(-1, addr); 130} 131 132extern ANDROID_ATOMIC_INLINE 133int32_t android_atomic_and(int32_t value, volatile int32_t *ptr) 134{ 135 int32_t prev, status; 136 android_memory_barrier(); 137 do { 138 prev = *ptr; 139 status = android_atomic_cas(prev, prev & value, ptr); 140 } while (__builtin_expect(status != 0, 0)); 141 return prev; 142} 143 144extern ANDROID_ATOMIC_INLINE 145int32_t android_atomic_or(int32_t value, volatile int32_t *ptr) 146{ 147 int32_t prev, status; 148 android_memory_barrier(); 149 do { 150 prev = *ptr; 151 status = android_atomic_cas(prev, prev | value, ptr); 152 } while (__builtin_expect(status != 0, 0)); 153 return prev; 154} 155 156#endif /* ANDROID_CUTILS_ATOMIC_AARCH64_H */ 157