/*

 * Copyright (c) 1999, 2017, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * 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.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 *

 */

#ifndef OS_CPU_LINUX_X86_VM_ATOMIC_LINUX_X86_HPP

#define OS_CPU_LINUX_X86_VM_ATOMIC_LINUX_X86_HPP

// Implementation of class atomic

inline void Atomic::store    (jbyte    store_value, jbyte*    dest) { *dest = store_value; }

inline void Atomic::store    (jshort   store_value, jshort*   dest) { *dest = store_value; }

inline void Atomic::store    (jint     store_value, jint*     dest) { *dest = store_value; }

inline void Atomic::store_ptr(intptr_t store_value, intptr_t* dest) { *dest = store_value; }

inline void Atomic::store_ptr(void*    store_value, void*     dest) { *(void**)dest = store_value; }

inline void Atomic::store    (jbyte    store_value, volatile jbyte*    dest) { *dest = store_value; }

inline void Atomic::store    (jshort   store_value, volatile jshort*   dest) { *dest = store_value; }

inline void Atomic::store    (jint     store_value, volatile jint*     dest) { *dest = store_value; }

inline void Atomic::store_ptr(intptr_t store_value, volatile intptr_t* dest) { *dest = store_value; }

inline void Atomic::store_ptr(void*    store_value, volatile void*     dest) { *(void* volatile *)dest = store_value; }

template<size_t byte_size>

struct Atomic::PlatformAdd

  : Atomic::FetchAndAdd<Atomic::PlatformAdd<byte_size> >

{

  template<typename I, typename D>

  D fetch_and_add(I add_value, D volatile* dest) const;

};

template<>

template<typename I, typename D>

inline D Atomic::PlatformAdd<4>::fetch_and_add(I add_value, D volatile* dest) const {

  STATIC_ASSERT(4 == sizeof(I));

  STATIC_ASSERT(4 == sizeof(D));

  D old_value;

  __asm__ volatile (  "lock xaddl %0,(%2)"

                    : "=r" (old_value)

                    : "0" (add_value), "r" (dest)

                    : "cc", "memory");

  return old_value;

}

inline jint     Atomic::xchg    (jint     exchange_value, volatile jint*     dest) {

  __asm__ volatile (  "xchgl (%2),%0"

                    : "=r" (exchange_value)

                    : "0" (exchange_value), "r" (dest)

                    : "memory");

  return exchange_value;

}

inline void*    Atomic::xchg_ptr(void*    exchange_value, volatile void*     dest) {

  return (void*)xchg_ptr((intptr_t)exchange_value, (volatile intptr_t*)dest);

}

template<>

template<typename T>

inline T Atomic::PlatformCmpxchg<1>::operator()(T exchange_value,

                                                T volatile* dest,

                                                T compare_value,

                                                cmpxchg_memory_order /* order */) const {

  STATIC_ASSERT(1 == sizeof(T));

  __asm__ volatile ("lock cmpxchgb %1,(%3)"

                    : "=a" (exchange_value)

                    : "q" (exchange_value), "a" (compare_value), "r" (dest)

                    : "cc", "memory");

  return exchange_value;

}

template<>

template<typename T>

inline T Atomic::PlatformCmpxchg<4>::operator()(T exchange_value,

                                                T volatile* dest,

                                                T compare_value,

                                                cmpxchg_memory_order /* order */) const {

  STATIC_ASSERT(4 == sizeof(T));

  __asm__ volatile ("lock cmpxchgl %1,(%3)"

                    : "=a" (exchange_value)

                    : "r" (exchange_value), "a" (compare_value), "r" (dest)

                    : "cc", "memory");

  return exchange_value;

}

#ifdef AMD64

inline void Atomic::store    (jlong    store_value, jlong*    dest) { *dest = store_value; }

inline void Atomic::store    (jlong    store_value, volatile jlong*    dest) { *dest = store_value; }

template<>

template<typename I, typename D>

inline D Atomic::PlatformAdd<8>::fetch_and_add(I add_value, D volatile* dest) const {

  STATIC_ASSERT(8 == sizeof(I));

  STATIC_ASSERT(8 == sizeof(D));

  D old_value;

  __asm__ __volatile__ ("lock xaddq %0,(%2)"

                        : "=r" (old_value)

                        : "0" (add_value), "r" (dest)

                        : "cc", "memory");

  return old_value;

}

inline intptr_t Atomic::xchg_ptr(intptr_t exchange_value, volatile intptr_t* dest) {

  __asm__ __volatile__ ("xchgq (%2),%0"

                        : "=r" (exchange_value)

                        : "0" (exchange_value), "r" (dest)

                        : "memory");

  return exchange_value;

}

template<>

template<typename T>

inline T Atomic::PlatformCmpxchg<8>::operator()(T exchange_value,

                                                T volatile* dest,

                                                T compare_value,

                                                cmpxchg_memory_order /* order */) const {

  STATIC_ASSERT(8 == sizeof(T));

  __asm__ __volatile__ ("lock cmpxchgq %1,(%3)"

                        : "=a" (exchange_value)

                        : "r" (exchange_value), "a" (compare_value), "r" (dest)

                        : "cc", "memory");

  return exchange_value;

}

inline jlong Atomic::load(const volatile jlong* src) { return *src; }

#else // !AMD64

inline intptr_t Atomic::xchg_ptr(intptr_t exchange_value, volatile intptr_t* dest) {

  return (intptr_t)xchg((jint)exchange_value, (volatile jint*)dest);

}

extern "C" {

  // defined in linux_x86.s

  jlong _Atomic_cmpxchg_long(jlong, volatile jlong*, jlong);

  void _Atomic_move_long(const volatile jlong* src, volatile jlong* dst);

}

template<>

template<typename T>

inline T Atomic::PlatformCmpxchg<8>::operator()(T exchange_value,

                                                T volatile* dest,

                                                T compare_value,

                                                cmpxchg_memory_order order) const {

  STATIC_ASSERT(8 == sizeof(T));

  return cmpxchg_using_helper<jlong>(_Atomic_cmpxchg_long, exchange_value, dest, compare_value);

}

inline jlong Atomic::load(const volatile jlong* src) {

  volatile jlong dest;

  _Atomic_move_long(src, &dest);

  return dest;

}

inline void Atomic::store(jlong store_value, jlong* dest) {

  _Atomic_move_long((volatile jlong*)&store_value, (volatile jlong*)dest);

}

inline void Atomic::store(jlong store_value, volatile jlong* dest) {

  _Atomic_move_long((volatile jlong*)&store_value, dest);

}

#endif // AMD64

#endif // OS_CPU_LINUX_X86_VM_ATOMIC_LINUX_X86_HPP