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Diffstat (limited to 'include/cutils/atomic-aarch64.h')
| -rw-r--r-- | include/cutils/atomic-aarch64.h | 227 |
1 files changed, 227 insertions, 0 deletions
diff --git a/include/cutils/atomic-aarch64.h b/include/cutils/atomic-aarch64.h new file mode 100644 index 0000000..927379f --- /dev/null +++ b/include/cutils/atomic-aarch64.h @@ -0,0 +1,227 @@ +/* + * Copyright (C) 2014 The Android Open Source Project + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * * Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE + * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, + * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS + * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED + * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, + * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT + * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#ifndef ANDROID_CUTILS_ATOMIC_AARCH64_H +#define ANDROID_CUTILS_ATOMIC_AARCH64_H + +#include <stdint.h> + +#ifndef ANDROID_ATOMIC_INLINE +#define ANDROID_ATOMIC_INLINE inline __attribute__((always_inline)) +#endif + +/* + TODOAArch64: Revisit the below functions and check for potential + optimizations using assembly code or otherwise. +*/ + +extern ANDROID_ATOMIC_INLINE +void android_compiler_barrier(void) +{ + __asm__ __volatile__ ("" : : : "memory"); +} + +#if ANDROID_SMP == 0 +extern ANDROID_ATOMIC_INLINE +void android_memory_barrier(void) +{ + android_compiler_barrier(); +} +extern ANDROID_ATOMIC_INLINE +void android_memory_store_barrier(void) +{ + android_compiler_barrier(); +} +#else +extern ANDROID_ATOMIC_INLINE +void android_memory_barrier(void) +{ + __asm__ __volatile__ ("dmb ish" : : : "memory"); +} +extern ANDROID_ATOMIC_INLINE +void android_memory_store_barrier(void) +{ + __asm__ __volatile__ ("dmb isht" : : : "memory"); +} +#endif + +extern ANDROID_ATOMIC_INLINE +int32_t android_atomic_acquire_load(volatile const int32_t *ptr) +{ + int32_t value = *ptr; + android_memory_barrier(); + return value; +} + +extern ANDROID_ATOMIC_INLINE +int64_t android_atomic_acquire_load64(volatile const int64_t *ptr) +{ + int64_t value = *ptr; + android_memory_barrier(); + return value; +} + +extern ANDROID_ATOMIC_INLINE +int32_t android_atomic_release_load(volatile const int32_t *ptr) +{ + android_memory_barrier(); + return *ptr; +} + +extern ANDROID_ATOMIC_INLINE +int64_t android_atomic_release_load64(volatile const int64_t *ptr) +{ + android_memory_barrier(); + return *ptr; +} + +extern ANDROID_ATOMIC_INLINE +void android_atomic_acquire_store(int32_t value, volatile int32_t *ptr) +{ + *ptr = value; + android_memory_barrier(); +} + +extern ANDROID_ATOMIC_INLINE +void android_atomic_acquire_store64(int64_t value, volatile int64_t *ptr) +{ + *ptr = value; + android_memory_barrier(); +} + +extern ANDROID_ATOMIC_INLINE +void android_atomic_release_store(int32_t value, volatile int32_t *ptr) +{ + android_memory_barrier(); + *ptr = value; +} + +extern ANDROID_ATOMIC_INLINE +void android_atomic_release_store64(int64_t value, volatile int64_t *ptr) +{ + android_memory_barrier(); + *ptr = value; +} + +extern ANDROID_ATOMIC_INLINE +int android_atomic_cas(int32_t old_value, int32_t new_value, + volatile int32_t *ptr) +{ + return __sync_val_compare_and_swap(ptr, old_value, new_value) != old_value; +} + +extern ANDROID_ATOMIC_INLINE +int64_t android_atomic_cas64(int64_t old_value, int64_t new_value, + volatile int64_t *ptr) +{ + return __sync_val_compare_and_swap(ptr, old_value, new_value) != old_value; +} + +extern ANDROID_ATOMIC_INLINE +int android_atomic_acquire_cas(int32_t old_value, int32_t new_value, + volatile int32_t *ptr) +{ + int status = android_atomic_cas(old_value, new_value, ptr); + android_memory_barrier(); + return status; +} + +extern ANDROID_ATOMIC_INLINE +int64_t android_atomic_acquire_cas64(int64_t old_value, int64_t new_value, + volatile int64_t *ptr) +{ + int status = android_atomic_cas64(old_value, new_value, ptr); + android_memory_barrier(); + return status; +} + +extern ANDROID_ATOMIC_INLINE +int android_atomic_release_cas(int32_t old_value, int32_t new_value, + volatile int32_t *ptr) +{ + android_memory_barrier(); + return android_atomic_cas(old_value, new_value, ptr); +} + +extern ANDROID_ATOMIC_INLINE +int64_t android_atomic_release_cas64(int64_t old_value, int64_t new_value, + volatile int64_t *ptr) +{ + android_memory_barrier(); + return android_atomic_cas64(old_value, new_value, ptr); +} + +extern ANDROID_ATOMIC_INLINE +int32_t android_atomic_add(int32_t increment, volatile int32_t *ptr) +{ + int32_t prev, status; + android_memory_barrier(); + do { + prev = *ptr; + status = android_atomic_cas(prev, prev + increment, ptr); + } while (__builtin_expect(status != 0, 0)); + return prev; +} + +extern ANDROID_ATOMIC_INLINE +int32_t android_atomic_inc(volatile int32_t *addr) +{ + return android_atomic_add(1, addr); +} + +extern ANDROID_ATOMIC_INLINE +int32_t android_atomic_dec(volatile int32_t *addr) +{ + return android_atomic_add(-1, addr); +} + +extern ANDROID_ATOMIC_INLINE +int32_t android_atomic_and(int32_t value, volatile int32_t *ptr) +{ + int32_t prev, status; + android_memory_barrier(); + do { + prev = *ptr; + status = android_atomic_cas(prev, prev & value, ptr); + } while (__builtin_expect(status != 0, 0)); + return prev; +} + +extern ANDROID_ATOMIC_INLINE +int32_t android_atomic_or(int32_t value, volatile int32_t *ptr) +{ + int32_t prev, status; + android_memory_barrier(); + do { + prev = *ptr; + status = android_atomic_cas(prev, prev | value, ptr); + } while (__builtin_expect(status != 0, 0)); + return prev; +} + +#endif /* ANDROID_CUTILS_ATOMIC_AARCH64_H */ |