1 /* 2 * Copyright (c) 1997, 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 SHARE_RUNTIME_ABSTRACT_VM_VERSION_HPP 26 #define SHARE_RUNTIME_ABSTRACT_VM_VERSION_HPP 27 28 #include "memory/allStatic.hpp" // For declaration of class AllStatic 29 #include "utilities/globalDefinitions.hpp" 30 31 typedef enum { 32 NoDetectedVirtualization, 33 XenHVM, 34 XenPVHVM, // mix-mode on Linux aarch64 35 KVM, 36 VMWare, 37 HyperV, 38 HyperVRole, 39 PowerVM, // on AIX or Linux ppc64(le) 40 PowerFullPartitionMode, // on Linux ppc64(le) 41 PowerKVM 42 } VirtualizationType; 43 44 class outputStream; 45 enum class vmIntrinsicID; 46 47 // Abstract_VM_Version provides information about the VM. 48 49 class Abstract_VM_Version: AllStatic { 50 friend class VMStructs; 51 friend class JVMCIVMStructs; 52 53 protected: 54 static const char* _s_vm_release; 55 static const char* _s_internal_vm_info_string; 56 57 // CPU feature flags. 58 static uint64_t _features; 59 static const char* _features_string; 60 61 // These are set by machine-dependent initializations 62 static bool _supports_cx8; 63 static bool _supports_atomic_getset4; 64 static bool _supports_atomic_getset8; 65 static bool _supports_atomic_getadd4; 66 static bool _supports_atomic_getadd8; 67 static unsigned int _logical_processors_per_package; 68 static unsigned int _L1_data_cache_line_size; 69 static int _vm_major_version; 70 static int _vm_minor_version; 71 static int _vm_security_version; 72 static int _vm_patch_version; 73 static int _vm_build_number; 74 static unsigned int _data_cache_line_flush_size; 75 76 public: 77 78 static VirtualizationType _detected_virtualization; 79 80 // Called as part of the runtime services initialization which is 81 // called from the management module initialization (via init_globals()) 82 // after argument parsing and attaching of the main thread has 83 // occurred. Examines a variety of the hardware capabilities of 84 // the platform to determine which features can be used to execute the 85 // program. 86 static void initialize() { } 87 88 // This allows for early initialization of VM_Version information 89 // that may be needed later in the initialization sequence but before 90 // full VM_Version initialization is possible. It can not depend on any 91 // other part of the VM being initialized when called. Platforms that 92 // need to specialize this define VM_Version::early_initialize(). 93 static void early_initialize() { } 94 95 // Called to initialize VM variables needing initialization 96 // after command line parsing. Platforms that need to specialize 97 // this should define VM_Version::init_before_ergo(). 98 static void init_before_ergo() {} 99 100 // Name 101 static const char* vm_name(); 102 // Vendor 103 static const char* vm_vendor(); 104 // VM version information string printed by launcher (java -version) 105 static const char* vm_info_string(); 106 static const char* vm_release(); 107 static const char* vm_platform_string(); 108 109 static int vm_major_version() { return _vm_major_version; } 110 static int vm_minor_version() { return _vm_minor_version; } 111 static int vm_security_version() { return _vm_security_version; } 112 static int vm_patch_version() { return _vm_patch_version; } 113 static int vm_build_number() { return _vm_build_number; } 114 115 // Gets the jvm_version_info.jvm_version 116 static unsigned int jvm_version(); 117 118 // Internal version providing additional build information 119 static const char* internal_vm_info_string(); 120 static const char* jdk_debug_level(); 121 static const char* printable_jdk_debug_level(); 122 123 static uint64_t features() { return _features; } 124 static const char* features_string() { return _features_string; } 125 static void insert_features_names(char* buf, size_t buflen, const char* features_names[]); 126 127 static VirtualizationType get_detected_virtualization() { 128 return _detected_virtualization; 129 } 130 131 // platforms that need to specialize this 132 // define VM_Version::print_platform_virtualization_info() 133 static void print_platform_virtualization_info(outputStream*) { } 134 135 // does HW support an 8-byte compare-exchange operation? 136 static bool supports_cx8() { 137 #ifdef SUPPORTS_NATIVE_CX8 138 return true; 139 #else 140 return _supports_cx8; 141 #endif 142 } 143 // does HW support atomic get-and-set or atomic get-and-add? Used 144 // to guide intrinsification decisions for Unsafe atomic ops 145 static bool supports_atomic_getset4() {return _supports_atomic_getset4;} 146 static bool supports_atomic_getset8() {return _supports_atomic_getset8;} 147 static bool supports_atomic_getadd4() {return _supports_atomic_getadd4;} 148 static bool supports_atomic_getadd8() {return _supports_atomic_getadd8;} 149 150 static unsigned int logical_processors_per_package() { 151 return _logical_processors_per_package; 152 } 153 154 static unsigned int L1_data_cache_line_size() { 155 return _L1_data_cache_line_size; 156 } 157 158 // the size in bytes of a data cache line flushed by a flush 159 // operation which should be a power of two or zero if cache line 160 // writeback is not supported by the current os_cpu combination 161 static unsigned int data_cache_line_flush_size() { 162 return _data_cache_line_flush_size; 163 } 164 165 // returns true if and only if cache line writeback is supported 166 static bool supports_data_cache_line_flush() { 167 return _data_cache_line_flush_size != 0; 168 } 169 170 // Denominator for computing default ParallelGCThreads for machines with 171 // a large number of cores. 172 static uint parallel_worker_threads_denominator() { return 8; } 173 174 // Does this CPU support spin wait instruction? 175 static bool supports_on_spin_wait() { return false; } 176 177 // Does platform support fast class initialization checks for static methods? 178 static bool supports_fast_class_init_checks() { return false; } 179 180 // Does platform support stack watermark barriers for concurrent stack processing? 181 constexpr static bool supports_stack_watermark_barrier() { return false; } 182 183 // Is recursive lightweight locking implemented for this platform? 184 constexpr static bool supports_recursive_lightweight_locking() { return false; } 185 186 // Does platform support float16 instructions? 187 static bool supports_float16() { return false; } 188 189 // Does this CPU support this intrinsic? 190 static bool is_intrinsic_supported(vmIntrinsicID id) { return true; } 191 192 static bool print_matching_lines_from_file(const char* filename, outputStream* st, const char* keywords_to_match[]); 193 194 protected: 195 // VM_Version statics 196 static const size_t CPU_TYPE_DESC_BUF_SIZE = 256; 197 static const size_t CPU_DETAILED_DESC_BUF_SIZE = 4096; 198 199 static int _no_of_threads; 200 static int _no_of_cores; 201 static int _no_of_sockets; 202 static bool _initialized; 203 static char _cpu_name[CPU_TYPE_DESC_BUF_SIZE]; 204 static char _cpu_desc[CPU_DETAILED_DESC_BUF_SIZE]; 205 206 public: 207 static int number_of_threads(void); 208 static int number_of_cores(void); 209 static int number_of_sockets(void); 210 211 static const char* cpu_name(void); 212 static const char* cpu_description(void); 213 }; 214 215 #endif // SHARE_RUNTIME_ABSTRACT_VM_VERSION_HPP --- EOF ---