Carl Shapiro | 93b0cb4 | 2010-06-03 17:05:15 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2010 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | #ifndef ANDROID_CUTILS_ATOMIC_X86_H |
| 18 | #define ANDROID_CUTILS_ATOMIC_X86_H |
| 19 | |
| 20 | #include <stdint.h> |
| 21 | |
Ben Cheng | 5206d59 | 2012-12-07 10:54:09 -0800 | [diff] [blame] | 22 | #ifndef ANDROID_ATOMIC_INLINE |
| 23 | #define ANDROID_ATOMIC_INLINE inline __attribute__((always_inline)) |
| 24 | #endif |
| 25 | |
| 26 | extern ANDROID_ATOMIC_INLINE void android_compiler_barrier(void) |
Carl Shapiro | 93b0cb4 | 2010-06-03 17:05:15 -0700 | [diff] [blame] | 27 | { |
| 28 | __asm__ __volatile__ ("" : : : "memory"); |
| 29 | } |
| 30 | |
| 31 | #if ANDROID_SMP == 0 |
Ben Cheng | 5206d59 | 2012-12-07 10:54:09 -0800 | [diff] [blame] | 32 | extern ANDROID_ATOMIC_INLINE void android_memory_barrier(void) |
Carl Shapiro | 93b0cb4 | 2010-06-03 17:05:15 -0700 | [diff] [blame] | 33 | { |
| 34 | android_compiler_barrier(); |
| 35 | } |
Ben Cheng | 5206d59 | 2012-12-07 10:54:09 -0800 | [diff] [blame] | 36 | extern ANDROID_ATOMIC_INLINE void android_memory_store_barrier(void) |
Brian Carlstrom | 464431e | 2010-09-24 10:56:43 -0700 | [diff] [blame] | 37 | { |
| 38 | android_compiler_barrier(); |
| 39 | } |
Carl Shapiro | 93b0cb4 | 2010-06-03 17:05:15 -0700 | [diff] [blame] | 40 | #else |
Ben Cheng | 5206d59 | 2012-12-07 10:54:09 -0800 | [diff] [blame] | 41 | extern ANDROID_ATOMIC_INLINE void android_memory_barrier(void) |
Carl Shapiro | 93b0cb4 | 2010-06-03 17:05:15 -0700 | [diff] [blame] | 42 | { |
| 43 | __asm__ __volatile__ ("mfence" : : : "memory"); |
| 44 | } |
Ben Cheng | 5206d59 | 2012-12-07 10:54:09 -0800 | [diff] [blame] | 45 | extern ANDROID_ATOMIC_INLINE void android_memory_store_barrier(void) |
Brian Carlstrom | 464431e | 2010-09-24 10:56:43 -0700 | [diff] [blame] | 46 | { |
| 47 | android_compiler_barrier(); |
| 48 | } |
Carl Shapiro | 93b0cb4 | 2010-06-03 17:05:15 -0700 | [diff] [blame] | 49 | #endif |
| 50 | |
Ben Cheng | 5206d59 | 2012-12-07 10:54:09 -0800 | [diff] [blame] | 51 | extern ANDROID_ATOMIC_INLINE int32_t |
| 52 | android_atomic_acquire_load(volatile const int32_t *ptr) |
Carl Shapiro | d55f0ad | 2010-09-28 13:47:03 -0700 | [diff] [blame] | 53 | { |
Carl Shapiro | 93b0cb4 | 2010-06-03 17:05:15 -0700 | [diff] [blame] | 54 | int32_t value = *ptr; |
| 55 | android_compiler_barrier(); |
| 56 | return value; |
| 57 | } |
| 58 | |
Ben Cheng | 5206d59 | 2012-12-07 10:54:09 -0800 | [diff] [blame] | 59 | extern ANDROID_ATOMIC_INLINE int32_t |
| 60 | android_atomic_release_load(volatile const int32_t *ptr) |
Carl Shapiro | d55f0ad | 2010-09-28 13:47:03 -0700 | [diff] [blame] | 61 | { |
Carl Shapiro | 93b0cb4 | 2010-06-03 17:05:15 -0700 | [diff] [blame] | 62 | android_memory_barrier(); |
| 63 | return *ptr; |
| 64 | } |
| 65 | |
Ben Cheng | 5206d59 | 2012-12-07 10:54:09 -0800 | [diff] [blame] | 66 | extern ANDROID_ATOMIC_INLINE void |
| 67 | android_atomic_acquire_store(int32_t value, volatile int32_t *ptr) |
Carl Shapiro | d55f0ad | 2010-09-28 13:47:03 -0700 | [diff] [blame] | 68 | { |
Carl Shapiro | 93b0cb4 | 2010-06-03 17:05:15 -0700 | [diff] [blame] | 69 | *ptr = value; |
| 70 | android_memory_barrier(); |
| 71 | } |
| 72 | |
Ben Cheng | 5206d59 | 2012-12-07 10:54:09 -0800 | [diff] [blame] | 73 | extern ANDROID_ATOMIC_INLINE void |
| 74 | android_atomic_release_store(int32_t value, volatile int32_t *ptr) |
Carl Shapiro | d55f0ad | 2010-09-28 13:47:03 -0700 | [diff] [blame] | 75 | { |
Carl Shapiro | 93b0cb4 | 2010-06-03 17:05:15 -0700 | [diff] [blame] | 76 | android_compiler_barrier(); |
| 77 | *ptr = value; |
| 78 | } |
| 79 | |
Ben Cheng | 5206d59 | 2012-12-07 10:54:09 -0800 | [diff] [blame] | 80 | extern ANDROID_ATOMIC_INLINE int |
| 81 | android_atomic_cas(int32_t old_value, int32_t new_value, volatile int32_t *ptr) |
Carl Shapiro | 93b0cb4 | 2010-06-03 17:05:15 -0700 | [diff] [blame] | 82 | { |
| 83 | int32_t prev; |
| 84 | __asm__ __volatile__ ("lock; cmpxchgl %1, %2" |
| 85 | : "=a" (prev) |
| 86 | : "q" (new_value), "m" (*ptr), "0" (old_value) |
| 87 | : "memory"); |
| 88 | return prev != old_value; |
| 89 | } |
| 90 | |
Ben Cheng | 5206d59 | 2012-12-07 10:54:09 -0800 | [diff] [blame] | 91 | extern ANDROID_ATOMIC_INLINE int |
| 92 | android_atomic_acquire_cas(int32_t old_value, |
| 93 | int32_t new_value, |
| 94 | volatile int32_t *ptr) |
Carl Shapiro | 93b0cb4 | 2010-06-03 17:05:15 -0700 | [diff] [blame] | 95 | { |
| 96 | /* Loads are not reordered with other loads. */ |
| 97 | return android_atomic_cas(old_value, new_value, ptr); |
| 98 | } |
| 99 | |
Ben Cheng | 5206d59 | 2012-12-07 10:54:09 -0800 | [diff] [blame] | 100 | extern ANDROID_ATOMIC_INLINE int |
| 101 | android_atomic_release_cas(int32_t old_value, |
| 102 | int32_t new_value, |
| 103 | volatile int32_t *ptr) |
Carl Shapiro | 93b0cb4 | 2010-06-03 17:05:15 -0700 | [diff] [blame] | 104 | { |
| 105 | /* Stores are not reordered with other stores. */ |
| 106 | return android_atomic_cas(old_value, new_value, ptr); |
| 107 | } |
| 108 | |
Ben Cheng | 5206d59 | 2012-12-07 10:54:09 -0800 | [diff] [blame] | 109 | extern ANDROID_ATOMIC_INLINE int32_t |
| 110 | android_atomic_add(int32_t increment, volatile int32_t *ptr) |
Carl Shapiro | 93b0cb4 | 2010-06-03 17:05:15 -0700 | [diff] [blame] | 111 | { |
| 112 | __asm__ __volatile__ ("lock; xaddl %0, %1" |
| 113 | : "+r" (increment), "+m" (*ptr) |
| 114 | : : "memory"); |
| 115 | /* increment now holds the old value of *ptr */ |
| 116 | return increment; |
| 117 | } |
| 118 | |
Ben Cheng | 5206d59 | 2012-12-07 10:54:09 -0800 | [diff] [blame] | 119 | extern ANDROID_ATOMIC_INLINE int32_t |
| 120 | android_atomic_inc(volatile int32_t *addr) |
Carl Shapiro | d55f0ad | 2010-09-28 13:47:03 -0700 | [diff] [blame] | 121 | { |
Carl Shapiro | 93b0cb4 | 2010-06-03 17:05:15 -0700 | [diff] [blame] | 122 | return android_atomic_add(1, addr); |
| 123 | } |
| 124 | |
Ben Cheng | 5206d59 | 2012-12-07 10:54:09 -0800 | [diff] [blame] | 125 | extern ANDROID_ATOMIC_INLINE int32_t |
| 126 | android_atomic_dec(volatile int32_t *addr) |
Carl Shapiro | d55f0ad | 2010-09-28 13:47:03 -0700 | [diff] [blame] | 127 | { |
Carl Shapiro | 93b0cb4 | 2010-06-03 17:05:15 -0700 | [diff] [blame] | 128 | return android_atomic_add(-1, addr); |
| 129 | } |
| 130 | |
Ben Cheng | 5206d59 | 2012-12-07 10:54:09 -0800 | [diff] [blame] | 131 | extern ANDROID_ATOMIC_INLINE int32_t |
| 132 | android_atomic_and(int32_t value, volatile int32_t *ptr) |
Carl Shapiro | 93b0cb4 | 2010-06-03 17:05:15 -0700 | [diff] [blame] | 133 | { |
| 134 | int32_t prev, status; |
| 135 | do { |
| 136 | prev = *ptr; |
| 137 | status = android_atomic_cas(prev, prev & value, ptr); |
| 138 | } while (__builtin_expect(status != 0, 0)); |
| 139 | return prev; |
| 140 | } |
| 141 | |
Ben Cheng | 5206d59 | 2012-12-07 10:54:09 -0800 | [diff] [blame] | 142 | extern ANDROID_ATOMIC_INLINE int32_t |
| 143 | android_atomic_or(int32_t value, volatile int32_t *ptr) |
Carl Shapiro | 93b0cb4 | 2010-06-03 17:05:15 -0700 | [diff] [blame] | 144 | { |
| 145 | int32_t prev, status; |
| 146 | do { |
| 147 | prev = *ptr; |
| 148 | status = android_atomic_cas(prev, prev | value, ptr); |
| 149 | } while (__builtin_expect(status != 0, 0)); |
| 150 | return prev; |
| 151 | } |
| 152 | |
| 153 | #endif /* ANDROID_CUTILS_ATOMIC_X86_H */ |