1 /*
   2  * Copyright (c) 2003, 2019, Oracle and/or its affiliates. All rights reserved.
   3  * Copyright (c) 2014, 2019, Red Hat Inc. All rights reserved.
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This code is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License version 2 only, as
   8  * published by the Free Software Foundation.
   9  *
  10  * This code is distributed in the hope that it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  13  * version 2 for more details (a copy is included in the LICENSE file that
  14  * accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License version
  17  * 2 along with this work; if not, write to the Free Software Foundation,
  18  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  19  *
  20  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  21  * or visit www.oracle.com if you need additional information or have any
  22  * questions.
  23  *
  24  */
  25 
  26 #ifndef OS_CPU_LINUX_AARCH64_ORDERACCESS_LINUX_AARCH64_HPP
  27 #define OS_CPU_LINUX_AARCH64_ORDERACCESS_LINUX_AARCH64_HPP
  28 
  29 // Included in orderAccess.hpp header file.
  30 
  31 #include "runtime/vm_version.hpp"
  32 
  33 // Implementation of class OrderAccess.
  34 
  35 inline void OrderAccess::loadload()   { acquire(); }
  36 inline void OrderAccess::storestore() { release(); }
  37 inline void OrderAccess::loadstore()  { acquire(); }
  38 inline void OrderAccess::storeload()  { fence(); }
  39 
  40 #define FULL_MEM_BARRIER  __sync_synchronize()
  41 #define READ_MEM_BARRIER  __atomic_thread_fence(__ATOMIC_ACQUIRE);
  42 #define WRITE_MEM_BARRIER __atomic_thread_fence(__ATOMIC_RELEASE);
  43 
  44 inline void OrderAccess::acquire() {
  45   READ_MEM_BARRIER;
  46 }
  47 
  48 inline void OrderAccess::release() {
  49   WRITE_MEM_BARRIER;
  50 }
  51 
  52 inline void OrderAccess::fence() {
  53   FULL_MEM_BARRIER;
  54 }
  55 
  56 inline void OrderAccess::cross_modify_fence() { }
  57 
  58 #endif // OS_CPU_LINUX_AARCH64_ORDERACCESS_LINUX_AARCH64_HPP