1 /* 2 * Copyright (c) 1999, 2024, Oracle and/or its affiliates. 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 CPU_X86_GLOBALDEFINITIONS_X86_HPP 26 #define CPU_X86_GLOBALDEFINITIONS_X86_HPP 27 28 const int StackAlignmentInBytes = 16; 29 const size_t pd_segfault_address = 1024; 30 31 // Indicates whether the C calling conventions require that 32 // 32-bit integer argument values are extended to 64 bits. 33 const bool CCallingConventionRequiresIntsAsLongs = false; 34 35 #define SUPPORTS_NATIVE_CX8 36 37 #ifdef _LP64 38 #define SUPPORT_MONITOR_COUNT 39 #endif 40 41 #define CPU_MULTI_COPY_ATOMIC 42 43 // The expected size in bytes of a cache line. 44 #define DEFAULT_CACHE_LINE_SIZE 64 45 46 // The default padding size for data structures to avoid false sharing. 47 #ifdef _LP64 48 // The common wisdom is that adjacent cache line prefetchers on some hardware 49 // may pull two cache lines on access, so we have to pessimistically assume twice 50 // the cache line size for padding. TODO: Check if this is still true for modern 51 // hardware. If not, DEFAULT_CACHE_LINE_SIZE might as well suffice. 52 #define DEFAULT_PADDING_SIZE (DEFAULT_CACHE_LINE_SIZE*2) 53 #else 54 #define DEFAULT_PADDING_SIZE DEFAULT_CACHE_LINE_SIZE 55 #endif 56 57 #if defined(LINUX) || defined(__APPLE__) 58 #define SUPPORT_RESERVED_STACK_AREA 59 #endif 60 61 #define USE_POINTERS_TO_REGISTER_IMPL_ARRAY 62 63 #endif // CPU_X86_GLOBALDEFINITIONS_X86_HPP