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/*
* 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 ishst" : : : "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 */
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