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Commit c15d2ce5 authored by Ashok Bhat's avatar Ashok Bhat Committed by Ben Cheng
Browse files

AArch64: Add atomic functions 



This patch adds atomic functions for AArch64. The functions
will be revisited later for potential optimizations using
assembly or otherwise.

This patch also introduces new 64-bit atomic functions for
LP64 platforms.

Change-Id: Id2127dd01cea65025f939e955d73d27e95d8687e
Signed-off-by: default avatarMarcus Oakland <marcus.oakland@arm.com>
Signed-off-by: default avatarAshok Bhat <ashok.bhat@arm.com>
parent e76343ef

include/cutils/atomic-aarch64.h

0 → 100644
+227 −0
Original line number Diff line number Diff line 
/*

 * 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 */

include/cutils/atomic-inline.h

+3 −1
Original line number Diff line number Diff line
@@ -43,7 +43,9 @@ extern "C" { 
# error "Must define ANDROID_SMP before including atomic-inline.h"

#endif



#if defined(__arm__)

#if defined(__aarch64__)

#include <cutils/atomic-aarch64.h>

#elif defined(__arm__)

#include <cutils/atomic-arm.h>

#elif defined(__i386__) || defined(__x86_64__)

#include <cutils/atomic-x86.h>

include/cutils/atomic.h

+17 −0
Original line number Diff line number Diff line
@@ -80,6 +80,11 @@ int32_t android_atomic_or(int32_t value, volatile int32_t* addr); 
int32_t android_atomic_acquire_load(volatile const int32_t* addr);

int32_t android_atomic_release_load(volatile const int32_t* addr);



#if defined (__LP64__)

int64_t android_atomic_acquire_load64(volatile const int64_t* addr);

int64_t android_atomic_release_load64(volatile const int64_t* addr);

#endif



/*

 * Perform an atomic store with "acquire" or "release" ordering.

 *
@@ -89,6 +94,11 @@ int32_t android_atomic_release_load(volatile const int32_t* addr); 
void android_atomic_acquire_store(int32_t value, volatile int32_t* addr);

void android_atomic_release_store(int32_t value, volatile int32_t* addr);



#if defined (__LP64__)

void android_atomic_acquire_store64(int64_t value, volatile int64_t* addr);

void android_atomic_release_store64(int64_t value, volatile int64_t* addr);

#endif



/*

 * Compare-and-set operation with "acquire" or "release" ordering.

 *
@@ -106,6 +116,13 @@ int android_atomic_acquire_cas(int32_t oldvalue, int32_t newvalue, 
int android_atomic_release_cas(int32_t oldvalue, int32_t newvalue,

        volatile int32_t* addr);



#if defined (__LP64__)

int64_t android_atomic_acquire_cas64(int64_t old_value, int64_t new_value,

        volatile int64_t *ptr);

int64_t android_atomic_release_cas64(int64_t old_value, int64_t new_value,

        volatile int64_t *ptr);

#endif



/*

 * Aliases for code using an older version of this header.  These are now

 * deprecated and should not be used.  The definitions will be removed