1 /* 2 * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved. 3 * Copyright (c) 2012, 2014 SAP SE. 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_PPC_VM_ORDERACCESS_LINUX_PPC_INLINE_HPP 27 #define OS_CPU_LINUX_PPC_VM_ORDERACCESS_LINUX_PPC_INLINE_HPP 28 29 #include "runtime/orderAccess.hpp" 30 31 #ifndef PPC64 32 #error "OrderAccess currently only implemented for PPC64" 33 #endif 34 35 // Compiler version last used for testing: gcc 4.1.2 36 // Please update this information when this file changes 37 38 // Implementation of class OrderAccess. 39 40 // 41 // Machine barrier instructions: 42 // 43 // - sync Two-way memory barrier, aka fence. 44 // - lwsync orders Store|Store, 45 // Load|Store, 46 // Load|Load, 47 // but not Store|Load 48 // - eieio orders Store|Store 49 // - isync Invalidates speculatively executed instructions, 50 // but isync may complete before storage accesses 51 // associated with instructions preceding isync have 52 // been performed. 53 // 54 // Semantic barrier instructions: 55 // (as defined in orderAccess.hpp) 56 // 57 // - release orders Store|Store, (maps to lwsync) 58 // Load|Store 59 // - acquire orders Load|Store, (maps to lwsync) 60 // Load|Load 61 // - fence orders Store|Store, (maps to sync) 62 // Load|Store, 63 // Load|Load, 64 // Store|Load 65 // 66 67 #define inlasm_sync() __asm__ __volatile__ ("sync" : : : "memory"); 68 #define inlasm_lwsync() __asm__ __volatile__ ("lwsync" : : : "memory"); 69 #define inlasm_eieio() __asm__ __volatile__ ("eieio" : : : "memory"); 70 #define inlasm_isync() __asm__ __volatile__ ("isync" : : : "memory"); 71 // Use twi-isync for load_acquire (faster than lwsync). 72 #define inlasm_acquire_reg(X) __asm__ __volatile__ ("twi 0,%0,0\n isync\n" : : "r" (X) : "memory"); 73 74 inline void OrderAccess::loadload() { inlasm_lwsync(); } 75 inline void OrderAccess::storestore() { inlasm_lwsync(); } 76 inline void OrderAccess::loadstore() { inlasm_lwsync(); } 77 inline void OrderAccess::storeload() { inlasm_sync(); } 78 79 inline void OrderAccess::acquire() { inlasm_lwsync(); } 80 inline void OrderAccess::release() { inlasm_lwsync(); } 81 inline void OrderAccess::fence() { inlasm_sync(); } 82 83 84 template<size_t byte_size> 85 struct OrderAccess::PlatformOrderedLoad<byte_size, X_ACQUIRE> 86 { 87 template <typename T> 88 T operator()(const volatile T* p) const { register T t = Atomic::load(p); inlasm_acquire_reg(t); return t; } 89 }; 90 91 #undef inlasm_sync 92 #undef inlasm_lwsync 93 #undef inlasm_eieio 94 #undef inlasm_isync 95 #undef inlasm_acquire_reg 96 97 #endif // OS_CPU_LINUX_PPC_VM_ORDERACCESS_LINUX_PPC_INLINE_HPP