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