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_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
32typedef enum {
33 NoDetectedVirtualization,
34 XenHVM,
35 KVM,
36 VMWare,
37 HyperV,
38 PowerVM, // on AIX or Linux ppc64(le)
39 PowerFullPartitionMode, // on Linux ppc64(le)
40 PowerKVM
41} VirtualizationType;
42
43// VM_Version provides information about the VM.
44
45class Abstract_VM_Version: AllStatic {
46 friend class VMStructs;
47 friend class JVMCIVMStructs;
48
49 protected:
50 static const char* _s_vm_release;
51 static const char* _s_internal_vm_info_string;
52
53 // CPU feature flags.
54 static uint64_t _features;
55 static const char* _features_string;
56
57 // These are set by machine-dependent initializations
58 static bool _supports_cx8;
59 static bool _supports_atomic_getset4;
60 static bool _supports_atomic_getset8;
61 static bool _supports_atomic_getadd4;
62 static bool _supports_atomic_getadd8;
63 static unsigned int _logical_processors_per_package;
64 static unsigned int _L1_data_cache_line_size;
65 static int _vm_major_version;
66 static int _vm_minor_version;
67 static int _vm_security_version;
68 static int _vm_patch_version;
69 static int _vm_build_number;
70
71 static VirtualizationType _detected_virtualization;
72
73 public:
74 // Called as part of the runtime services initialization which is
75 // called from the management module initialization (via init_globals())
76 // after argument parsing and attaching of the main thread has
77 // occurred. Examines a variety of the hardware capabilities of
78 // the platform to determine which features can be used to execute the
79 // program.
80 static void initialize() { }
81
82 // This allows for early initialization of VM_Version information
83 // that may be needed later in the initialization sequence but before
84 // full VM_Version initialization is possible. It can not depend on any
85 // other part of the VM being initialized when called. Platforms that
86 // need to specialize this define VM_Version::early_initialize().
87 static void early_initialize() { }
88
89 // Called to initialize VM variables needing initialization
90 // after command line parsing. Platforms that need to specialize
91 // this should define VM_Version::init_before_ergo().
92 static void init_before_ergo() {}
93
94 // Name
95 static const char* vm_name();
96 // Vendor
97 static const char* vm_vendor();
98 // VM version information string printed by launcher (java -version)
99 static const char* vm_info_string();
100 static const char* vm_release();
101 static const char* vm_platform_string();
102 static const char* vm_build_user();
103
104 static int vm_major_version() { return _vm_major_version; }
105 static int vm_minor_version() { return _vm_minor_version; }
106 static int vm_security_version() { return _vm_security_version; }
107 static int vm_patch_version() { return _vm_patch_version; }
108 static int vm_build_number() { return _vm_build_number; }
109
110 // Gets the jvm_version_info.jvm_version defined in jvm.h
111 static unsigned int jvm_version();
112
113 // Internal version providing additional build information
114 static const char* internal_vm_info_string();
115 static const char* jre_release_version();
116 static const char* jdk_debug_level();
117 static const char* printable_jdk_debug_level();
118
119 static uint64_t features() {
120 return _features;
121 }
122
123 static const char* features_string() {
124 return _features_string;
125 }
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 // ARCH specific policy for the BiasedLocking
159 static bool use_biased_locking() { return true; }
160
161 // Number of page sizes efficiently supported by the hardware. Most chips now
162 // support two sizes, thus this default implementation. Processor-specific
163 // subclasses should define new versions to hide this one as needed. Note
164 // that the O/S may support more sizes, but at most this many are used.
165 static uint page_size_count() { return 2; }
166
167 // Denominator for computing default ParallelGCThreads for machines with
168 // a large number of cores.
169 static uint parallel_worker_threads_denominator() { return 8; }
170
171 // Does this CPU support spin wait instruction?
172 static bool supports_on_spin_wait() { return false; }
173
174 // Does platform support fast class initialization checks for static methods?
175 static bool supports_fast_class_init_checks() { return false; }
176
177 static bool print_matching_lines_from_file(const char* filename, outputStream* st, const char* keywords_to_match[]);
178};
179
180#include CPU_HEADER(vm_version)
181
182#endif // SHARE_RUNTIME_VM_VERSION_HPP
183