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