1 /*
2 * Copyright (c) 1997, 2020, 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.
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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
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23 */
24
25 #ifndef SHARE_VM_RUNTIME_VM_VERSION_HPP
26 #define SHARE_VM_RUNTIME_VM_VERSION_HPP
27
28 #include "memory/allocation.hpp"
29 #include "utilities/ostream.hpp"
30 #include "utilities/macros.hpp"
31
32 typedef enum {
33 NoDetectedVirtualization,
34 XenHVM,
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 // 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
72 static VirtualizationType _detected_virtualization;
73
74 static unsigned int _parallel_worker_threads;
75 static bool _parallel_worker_threads_initialized;
76
77 static unsigned int nof_parallel_worker_threads(unsigned int num,
78 unsigned int dem,
79 unsigned int switch_pt);
80 public:
81 // Called as part of the runtime services initialization which is
82 // called from the management module initialization (via init_globals())
83 // after argument parsing and attaching of the main thread has
84 // occurred. Examines a variety of the hardware capabilities of
85 // the platform to determine which features can be used to execute the
86 // program.
87 static void initialize();
88
89 // This allows for early initialization of VM_Version information
90 // that may be needed later in the initialization sequence but before
91 // full VM_Version initialization is possible. It can not depend on any
92 // other part of the VM being initialized when called. Platforms that
93 // need to specialize this define VM_Version::early_initialize().
94 static void early_initialize() { }
95
96 // Called to initialize VM variables needing initialization
97 // after command line parsing. Platforms that need to specialize
98 // this should define VM_Version::init_before_ergo().
99 static void init_before_ergo() {}
100
101 // Name
102 static const char* vm_name();
103 // Vendor
104 static const char* vm_vendor();
105 // VM version information string printed by launcher (java -version)
106 static const char* vm_info_string();
107 static const char* vm_release();
108 static const char* vm_platform_string();
109 static const char* vm_build_user();
110
111 static int vm_major_version() { return _vm_major_version; }
112 static int vm_minor_version() { return _vm_minor_version; }
113 static int vm_security_version() { return _vm_security_version; }
114 static int vm_patch_version() { return _vm_patch_version; }
115 static int vm_build_number() { return _vm_build_number; }
116
117 // Gets the jvm_version_info.jvm_version defined in jvm.h
118 static unsigned int jvm_version();
119
120 // Internal version providing additional build information
121 static const char* internal_vm_info_string();
122 static const char* jre_release_version();
123 static const char* jdk_debug_level();
124 static const char* printable_jdk_debug_level();
125
126 static uint64_t features() {
127 return _features;
128 }
129
130 static const char* features_string() {
131 return _features_string;
132 }
133
134 static VirtualizationType get_detected_virtualization() {
135 return _detected_virtualization;
136 }
137
138 // platforms that need to specialize this
139 // define VM_Version::print_platform_virtualization_info()
140 static void print_platform_virtualization_info(outputStream*) { }
141
142 // does HW support an 8-byte compare-exchange operation?
143 static bool supports_cx8() {
144 #ifdef SUPPORTS_NATIVE_CX8
145 return true;
146 #else
147 return _supports_cx8;
148 #endif
149 }
150 // does HW support atomic get-and-set or atomic get-and-add? Used
151 // to guide intrinsification decisions for Unsafe atomic ops
152 static bool supports_atomic_getset4() {return _supports_atomic_getset4;}
153 static bool supports_atomic_getset8() {return _supports_atomic_getset8;}
154 static bool supports_atomic_getadd4() {return _supports_atomic_getadd4;}
155 static bool supports_atomic_getadd8() {return _supports_atomic_getadd8;}
156
157 static unsigned int logical_processors_per_package() {
158 return _logical_processors_per_package;
159 }
160
161 static unsigned int L1_data_cache_line_size() {
162 return _L1_data_cache_line_size;
163 }
164
165 // ARCH specific policy for the BiasedLocking
166 static bool use_biased_locking() { return true; }
167
168 // Number of page sizes efficiently supported by the hardware. Most chips now
169 // support two sizes, thus this default implementation. Processor-specific
170 // subclasses should define new versions to hide this one as needed. Note
171 // that the O/S may support more sizes, but at most this many are used.
172 static uint page_size_count() { return 2; }
173
174 // Returns the number of parallel threads to be used for VM
175 // work. If that number has not been calculated, do so and
176 // save it. Returns ParallelGCThreads if it is set on the
177 // command line.
178 static unsigned int parallel_worker_threads();
179 // Calculates and returns the number of parallel threads. May
180 // be VM version specific.
181 static unsigned int calc_parallel_worker_threads();
182
183 // Does this CPU support spin wait instruction?
184 static bool supports_on_spin_wait() { return false; }
185
186 static bool print_matching_lines_from_file(const char* filename, outputStream* st, const char* keywords_to_match[]);
187 };
188
189 #include CPU_HEADER(vm_version)
190
191 #endif // SHARE_VM_RUNTIME_VM_VERSION_HPP