1 /* 2 * Copyright (c) 1997, 2019, 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/allocation.hpp" // For declaration of class AllStatic 29 #include "utilities/globalDefinitions.hpp" 30 31 typedef enum { 32 NoDetectedVirtualization, 33 XenHVM, 34 KVM, 35 VMWare, 36 HyperV, 37 PowerVM, // on AIX or Linux ppc64(le) 38 PowerFullPartitionMode, // on Linux ppc64(le) 39 PowerKVM 40 } VirtualizationType; 41 42 class outputStream; 43 44 // Abstract_VM_Version provides information about the VM. 45 46 class Abstract_VM_Version: AllStatic { 47 friend class VMStructs; 48 friend class JVMCIVMStructs; 49 50 protected: 51 static const char* _s_vm_release; 52 static const char* _s_internal_vm_info_string; 53 54 // CPU feature flags. 55 static uint64_t _features; 56 static const char* _features_string; 57 58 // These are set by machine-dependent initializations 59 static bool _supports_cx8; 60 static bool _supports_atomic_getset4; 61 static bool _supports_atomic_getset8; 62 static bool _supports_atomic_getadd4; 63 static bool _supports_atomic_getadd8; 64 static unsigned int _logical_processors_per_package; 65 static unsigned int _L1_data_cache_line_size; 66 static int _vm_major_version; 67 static int _vm_minor_version; 68 static int _vm_security_version; 69 static int _vm_patch_version; 70 static int _vm_build_number; 71 static unsigned int _data_cache_line_flush_size; 72 73 static VirtualizationType _detected_virtualization; 74 75 public: 76 // Called as part of the runtime services initialization which is 77 // called from the management module initialization (via init_globals()) 78 // after argument parsing and attaching of the main thread has 79 // occurred. Examines a variety of the hardware capabilities of 80 // the platform to determine which features can be used to execute the 81 // program. initialize()82 static void initialize() { } 83 84 // This allows for early initialization of VM_Version information 85 // that may be needed later in the initialization sequence but before 86 // full VM_Version initialization is possible. It can not depend on any 87 // other part of the VM being initialized when called. Platforms that 88 // need to specialize this define VM_Version::early_initialize(). early_initialize()89 static void early_initialize() { } 90 91 // Called to initialize VM variables needing initialization 92 // after command line parsing. Platforms that need to specialize 93 // this should define VM_Version::init_before_ergo(). init_before_ergo()94 static void init_before_ergo() {} 95 96 // Name 97 static const char* vm_name(); 98 // Vendor 99 static const char* vm_vendor(); 100 // VM version information string printed by launcher (java -version) 101 static const char* vm_info_string(); 102 static const char* vm_release(); 103 static const char* vm_platform_string(); 104 static const char* vm_build_user(); 105 vm_major_version()106 static int vm_major_version() { return _vm_major_version; } vm_minor_version()107 static int vm_minor_version() { return _vm_minor_version; } vm_security_version()108 static int vm_security_version() { return _vm_security_version; } vm_patch_version()109 static int vm_patch_version() { return _vm_patch_version; } vm_build_number()110 static int vm_build_number() { return _vm_build_number; } 111 112 // Gets the jvm_version_info.jvm_version 113 static unsigned int jvm_version(); 114 115 // Internal version providing additional build information 116 static const char* internal_vm_info_string(); 117 static const char* jre_release_version(); 118 static const char* jdk_debug_level(); 119 static const char* printable_jdk_debug_level(); 120 features()121 static uint64_t features() { 122 return _features; 123 } 124 features_string()125 static const char* features_string() { 126 return _features_string; 127 } 128 get_detected_virtualization()129 static VirtualizationType get_detected_virtualization() { 130 return _detected_virtualization; 131 } 132 133 // platforms that need to specialize this 134 // define VM_Version::print_platform_virtualization_info() print_platform_virtualization_info(outputStream *)135 static void print_platform_virtualization_info(outputStream*) { } 136 137 // does HW support an 8-byte compare-exchange operation? supports_cx8()138 static bool supports_cx8() { 139 #ifdef SUPPORTS_NATIVE_CX8 140 return true; 141 #else 142 return _supports_cx8; 143 #endif 144 } 145 // does HW support atomic get-and-set or atomic get-and-add? Used 146 // to guide intrinsification decisions for Unsafe atomic ops supports_atomic_getset4()147 static bool supports_atomic_getset4() {return _supports_atomic_getset4;} supports_atomic_getset8()148 static bool supports_atomic_getset8() {return _supports_atomic_getset8;} supports_atomic_getadd4()149 static bool supports_atomic_getadd4() {return _supports_atomic_getadd4;} supports_atomic_getadd8()150 static bool supports_atomic_getadd8() {return _supports_atomic_getadd8;} 151 logical_processors_per_package()152 static unsigned int logical_processors_per_package() { 153 return _logical_processors_per_package; 154 } 155 L1_data_cache_line_size()156 static unsigned int L1_data_cache_line_size() { 157 return _L1_data_cache_line_size; 158 } 159 160 // the size in bytes of a data cache line flushed by a flush 161 // operation which should be a power of two or zero if cache line 162 // writeback is not supported by the current os_cpu combination data_cache_line_flush_size()163 static unsigned int data_cache_line_flush_size() { 164 return _data_cache_line_flush_size; 165 } 166 167 // returns true if and only if cache line writeback is supported supports_data_cache_line_flush()168 static bool supports_data_cache_line_flush() { 169 return _data_cache_line_flush_size != 0; 170 } 171 172 // ARCH specific policy for the BiasedLocking use_biased_locking()173 static bool use_biased_locking() { return true; } 174 175 // Number of page sizes efficiently supported by the hardware. Most chips now 176 // support two sizes, thus this default implementation. Processor-specific 177 // subclasses should define new versions to hide this one as needed. Note 178 // that the O/S may support more sizes, but at most this many are used. page_size_count()179 static uint page_size_count() { return 2; } 180 181 // Denominator for computing default ParallelGCThreads for machines with 182 // a large number of cores. parallel_worker_threads_denominator()183 static uint parallel_worker_threads_denominator() { return 8; } 184 185 // Does this CPU support spin wait instruction? supports_on_spin_wait()186 static bool supports_on_spin_wait() { return false; } 187 188 // Does platform support fast class initialization checks for static methods? supports_fast_class_init_checks()189 static bool supports_fast_class_init_checks() { return false; } 190 191 static bool print_matching_lines_from_file(const char* filename, outputStream* st, const char* keywords_to_match[]); 192 }; 193 194 #endif // SHARE_RUNTIME_ABSTRACT_VM_VERSION_HPP 195