Merge "x86_64: Add atomic funtions"
This commit is contained in:
Elliott Hughes
Gerrit Code Review
commit
1c1bd84549
2 changed files with 229 additions and 1 deletions
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@ -47,8 +47,10 @@ extern "C" {
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#include <cutils/atomic-arm64.h>
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#elif defined(__arm__)
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#include <cutils/atomic-arm.h>
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#elif defined(__i386__) || defined(__x86_64__)
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#elif defined(__i386__)
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#include <cutils/atomic-x86.h>
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#elif defined(__x86_64__)
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#include <cutils/atomic-x86_64.h>
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#elif defined(__mips__)
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#include <cutils/atomic-mips.h>
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#else
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226
include/cutils/atomic-x86_64.h
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226
include/cutils/atomic-x86_64.h
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@ -0,0 +1,226 @@
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/*
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* Copyright (C) 2014 The Android Open Source Project
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef ANDROID_CUTILS_ATOMIC_X86_64_H
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#define ANDROID_CUTILS_ATOMIC_X86_64_H
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#include <stdint.h>
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#ifndef ANDROID_ATOMIC_INLINE
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#define ANDROID_ATOMIC_INLINE inline __attribute__((always_inline))
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#endif
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extern ANDROID_ATOMIC_INLINE
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void android_compiler_barrier(void)
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{
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__asm__ __volatile__ ("" : : : "memory");
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}
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#if ANDROID_SMP == 0
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extern ANDROID_ATOMIC_INLINE
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void android_memory_barrier(void)
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{
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android_compiler_barrier();
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}
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extern ANDROID_ATOMIC_INLINE
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void android_memory_store_barrier(void)
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{
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android_compiler_barrier();
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}
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#else
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extern ANDROID_ATOMIC_INLINE
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void android_memory_barrier(void)
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{
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__asm__ __volatile__ ("mfence" : : : "memory");
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}
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extern ANDROID_ATOMIC_INLINE
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void android_memory_store_barrier(void)
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{
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android_compiler_barrier();
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}
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#endif
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extern ANDROID_ATOMIC_INLINE
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int32_t android_atomic_acquire_load(volatile const int32_t *ptr)
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{
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int32_t value = *ptr;
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android_compiler_barrier();
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return value;
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}
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extern ANDROID_ATOMIC_INLINE
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int64_t android_atomic_acquire_load64(volatile const int64_t *ptr)
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{
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int64_t value = *ptr;
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android_compiler_barrier();
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return value;
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}
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extern ANDROID_ATOMIC_INLINE
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int32_t android_atomic_release_load(volatile const int32_t *ptr)
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{
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android_memory_barrier();
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return *ptr;
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}
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extern ANDROID_ATOMIC_INLINE
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int64_t android_atomic_release_load64(volatile const int64_t *ptr)
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{
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android_memory_barrier();
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return *ptr;
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}
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extern ANDROID_ATOMIC_INLINE
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void android_atomic_acquire_store(int32_t value, volatile int32_t *ptr)
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{
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*ptr = value;
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android_memory_barrier();
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}
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extern ANDROID_ATOMIC_INLINE
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void android_atomic_acquire_store64(int64_t value, volatile int64_t *ptr)
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{
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*ptr = value;
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android_memory_barrier();
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}
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extern ANDROID_ATOMIC_INLINE
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void android_atomic_release_store(int32_t value, volatile int32_t *ptr)
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{
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android_compiler_barrier();
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*ptr = value;
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}
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extern ANDROID_ATOMIC_INLINE
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void android_atomic_release_store64(int64_t value, volatile int64_t *ptr)
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{
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android_compiler_barrier();
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*ptr = value;
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}
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extern ANDROID_ATOMIC_INLINE
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int android_atomic_cas(int32_t old_value, int32_t new_value,
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volatile int32_t *ptr)
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{
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int32_t prev;
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__asm__ __volatile__ ("lock; cmpxchgl %1, %2"
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: "=a" (prev)
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: "q" (new_value), "m" (*ptr), "0" (old_value)
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: "memory");
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return prev != old_value;
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}
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extern ANDROID_ATOMIC_INLINE
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int64_t android_atomic_cas64(int64_t old_value, int64_t new_value,
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volatile int64_t *ptr)
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{
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int64_t prev;
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__asm__ __volatile__ ("lock; cmpxchgq %1, %2"
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: "=a" (prev)
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: "q" (new_value), "m" (*ptr), "0" (old_value)
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: "memory");
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return prev != old_value;
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}
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extern ANDROID_ATOMIC_INLINE
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int android_atomic_acquire_cas(int32_t old_value, int32_t new_value,
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volatile int32_t *ptr)
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{
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/* Loads are not reordered with other loads. */
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return android_atomic_cas(old_value, new_value, ptr);
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}
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extern ANDROID_ATOMIC_INLINE
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int64_t android_atomic_acquire_cas64(int64_t old_value, int64_t new_value,
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volatile int64_t *ptr)
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{
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/* Loads are not reordered with other loads. */
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return android_atomic_cas64(old_value, new_value, ptr);
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}
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extern ANDROID_ATOMIC_INLINE
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int android_atomic_release_cas(int32_t old_value, int32_t new_value,
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volatile int32_t *ptr)
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{
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/* Stores are not reordered with other stores. */
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return android_atomic_cas(old_value, new_value, ptr);
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}
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extern ANDROID_ATOMIC_INLINE
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int64_t android_atomic_release_cas64(int64_t old_value, int64_t new_value,
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volatile int64_t *ptr)
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{
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/* Stores are not reordered with other stores. */
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return android_atomic_cas64(old_value, new_value, ptr);
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}
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extern ANDROID_ATOMIC_INLINE
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int32_t android_atomic_add(int32_t increment, volatile int32_t *ptr)
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{
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__asm__ __volatile__ ("lock; xaddl %0, %1"
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: "+r" (increment), "+m" (*ptr)
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: : "memory");
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/* increment now holds the old value of *ptr */
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return increment;
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}
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extern ANDROID_ATOMIC_INLINE
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int32_t android_atomic_inc(volatile int32_t *addr)
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{
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return android_atomic_add(1, addr);
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}
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extern ANDROID_ATOMIC_INLINE
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int32_t android_atomic_dec(volatile int32_t *addr)
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{
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return android_atomic_add(-1, addr);
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}
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extern ANDROID_ATOMIC_INLINE
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int32_t android_atomic_and(int32_t value, volatile int32_t *ptr)
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{
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int32_t prev, status;
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do {
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prev = *ptr;
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status = android_atomic_cas(prev, prev & value, ptr);
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} while (__builtin_expect(status != 0, 0));
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return prev;
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}
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extern ANDROID_ATOMIC_INLINE
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int32_t android_atomic_or(int32_t value, volatile int32_t *ptr)
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{
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int32_t prev, status;
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do {
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prev = *ptr;
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status = android_atomic_cas(prev, prev | value, ptr);
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} while (__builtin_expect(status != 0, 0));
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return prev;
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}
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#endif /* ANDROID_CUTILS_ATOMIC_X86_64_H */
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