1 /* 2 * Copyright (c) 1999, 2018, Oracle and/or its affiliates. All rights reserved. 3 * Copyright (c) 2014, 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_VM_ATOMIC_LINUX_AARCH64_HPP 27 #define OS_CPU_LINUX_AARCH64_VM_ATOMIC_LINUX_AARCH64_HPP 28 29 #include "vm_version_aarch64.hpp" 30 31 // Implementation of class atomic 32 33 #define FULL_MEM_BARRIER __sync_synchronize() 34 #define READ_MEM_BARRIER __atomic_thread_fence(__ATOMIC_ACQUIRE); 35 #define WRITE_MEM_BARRIER __atomic_thread_fence(__ATOMIC_RELEASE); 36 37 template<size_t byte_size> 38 struct Atomic::PlatformAdd 39 : Atomic::AddAndFetch<Atomic::PlatformAdd<byte_size> > 40 { 41 template<typename I, typename D> 42 D add_and_fetch(I add_value, D volatile* dest, atomic_memory_order order) const { 43 return __sync_add_and_fetch(dest, add_value); 44 } 45 }; 46 47 template<size_t byte_size> 48 template<typename T> 49 inline T Atomic::PlatformXchg<byte_size>::operator()(T exchange_value, 50 T volatile* dest, 51 atomic_memory_order order) const { 52 STATIC_ASSERT(byte_size == sizeof(T)); 53 T res = __sync_lock_test_and_set(dest, exchange_value); 54 FULL_MEM_BARRIER; 55 return res; 56 } 57 58 template<size_t byte_size> 59 template<typename T> 60 inline T Atomic::PlatformCmpxchg<byte_size>::operator()(T exchange_value, 61 T volatile* dest, 62 T compare_value, 63 atomic_memory_order order) const { 64 STATIC_ASSERT(byte_size == sizeof(T)); 65 if (order == memory_order_relaxed) { 66 T value = compare_value; 67 __atomic_compare_exchange(dest, &value, &exchange_value, /*weak*/false, 68 __ATOMIC_RELAXED, __ATOMIC_RELAXED); 69 return value; 70 } else { 71 return __sync_val_compare_and_swap(dest, compare_value, exchange_value); 72 } 73 } 74 75 #endif // OS_CPU_LINUX_AARCH64_VM_ATOMIC_LINUX_AARCH64_HPP