/*
 * Copyright (c) 1999, 2017, Oracle and/or its affiliates. All rights reserved.
 * Copyright (c) 2014, Red Hat Inc. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
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 * published by the Free Software Foundation.
 *
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
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#ifndef OS_CPU_LINUX_AARCH64_VM_ATOMIC_LINUX_AARCH64_HPP
#define OS_CPU_LINUX_AARCH64_VM_ATOMIC_LINUX_AARCH64_HPP

#include "vm_version_aarch64.hpp"

// Implementation of class atomic

#define FULL_MEM_BARRIER  __sync_synchronize()
#define READ_MEM_BARRIER  __atomic_thread_fence(__ATOMIC_ACQUIRE);
#define WRITE_MEM_BARRIER __atomic_thread_fence(__ATOMIC_RELEASE);


template <>
inline int32_t GeneralizedAtomic::specialized_add<int32_t>(int32_t add_value, volatile int32_t* dest) {
 return __sync_add_and_fetch(dest, add_value);
}


template <>
inline int64_t GeneralizedAtomic::specialized_add<int64_t>(int64_t add_value, volatile int64_t* dest) {
 return __sync_add_and_fetch(dest, add_value);
}


template <>
inline int32_t GeneralizedAtomic::specialized_xchg<int32_t>(int32_t exchange_value, volatile int32_t* dest) {
  int32_t res = __sync_lock_test_and_set (dest, exchange_value);
  FULL_MEM_BARRIER;
  return res;
}

template <>
inline int64_t GeneralizedAtomic::specialized_xchg<int64_t>(int64_t exchange_value, volatile int64_t* dest) {
  int64_t res = __sync_lock_test_and_set (dest, exchange_value);
  FULL_MEM_BARRIER;
  return res;
}

template <typename T> T generic_cmpxchg(T exchange_value, volatile T* dest,
                                        T compare_value, cmpxchg_memory_order order)
{
  if (order == memory_order_relaxed) {
    T value = compare_value;
    __atomic_compare_exchange(dest, &value, &exchange_value, /*weak*/false,
                              __ATOMIC_RELAXED, __ATOMIC_RELAXED);
    return value;
  } else {
    return __sync_val_compare_and_swap(dest, compare_value, exchange_value);
  }
}

#define VM_HAS_SPECIALIZED_CMPXCHG_BYTE
template <>
inline int8_t GeneralizedAtomic::specialized_cmpxchg<int8_t>(int8_t exchange_value, volatile int8_t* dest, int8_t compare_value, cmpxchg_memory_order order) {
  return generic_cmpxchg(exchange_value, dest, compare_value, order);
}

template <>
inline int32_t GeneralizedAtomic::specialized_cmpxchg<int32_t>(int32_t exchange_value, volatile int32_t* dest, int32_t compare_value, cmpxchg_memory_order order) {
  return generic_cmpxchg(exchange_value, dest, compare_value, order);
}


template <>
inline int64_t GeneralizedAtomic::specialized_cmpxchg<int64_t>(int64_t exchange_value, volatile int64_t* dest, int64_t compare_value, cmpxchg_memory_order order) {
  return generic_cmpxchg(exchange_value, dest, compare_value, order);
}


#endif // OS_CPU_LINUX_AARCH64_VM_ATOMIC_LINUX_AARCH64_HPP