1 /*
   2  * Copyright (c) 2020, Microsoft Corporation. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #ifndef OS_CPU_WINDOWS_AARCH64_ORDERACCESS_WINDOWS_AARCH64_HPP
  26 #define OS_CPU_WINDOWS_AARCH64_ORDERACCESS_WINDOWS_AARCH64_HPP
  27 
  28 // Included in orderAccess.hpp header file.
  29 
  30 #include <intrin.h>
  31 #include "vm_version_aarch64.hpp"
  32 #include "runtime/vm_version.hpp"
  33 
  34 // Implementation of class OrderAccess.
  35 
  36 inline void OrderAccess::loadload()   { acquire(); }
  37 inline void OrderAccess::storestore() { release(); }
  38 inline void OrderAccess::loadstore()  { acquire(); }
  39 inline void OrderAccess::storeload()  { fence(); }
  40 
  41 inline void OrderAccess::acquire() {
  42   _ReadBarrier();
  43   __dmb(_ARM64_BARRIER_ISHLD);
  44 }
  45 
  46 inline void OrderAccess::release() {
  47   _WriteBarrier();
  48   __dmb(_ARM64_BARRIER_ISHST);
  49 }
  50 
  51 inline void OrderAccess::fence() {
  52   _ReadWriteBarrier();
  53   __dmb(_ARM64_BARRIER_ISH);
  54 }
  55 
  56 inline void OrderAccess::cross_modify_fence() { }
  57 
  58 #endif // OS_CPU_WINDOWS_AARCH64_ORDERACCESS_WINDOWS_AARCH64_HPP