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
21 * questions.
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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 HyperVRole,
38 PowerVM, // on AIX or Linux ppc64(le)
39 PowerFullPartitionMode, // on Linux ppc64(le)
40 PowerKVM
41 } VirtualizationType;
42
43 class outputStream;
44
45 // Abstract_VM_Version provides information about the VM.
46
47 class Abstract_VM_Version: AllStatic {
48 friend class VMStructs;
49 friend class JVMCIVMStructs;
50
51 protected:
52 static const char* _s_vm_release;
53 static const char* _s_internal_vm_info_string;
54
55 // CPU feature flags.
56 static uint64_t _features;
57 static const char* _features_string;
58
59 // These are set by machine-dependent initializations
60 static bool _supports_cx8;
61 static bool _supports_atomic_getset4;
62 static bool _supports_atomic_getset8;
63 static bool _supports_atomic_getadd4;
64 static bool _supports_atomic_getadd8;
65 static unsigned int _logical_processors_per_package;
66 static unsigned int _L1_data_cache_line_size;
67 static int _vm_major_version;
68 static int _vm_minor_version;
69 static int _vm_security_version;
70 static int _vm_patch_version;
71 static int _vm_build_number;
72 static unsigned int _data_cache_line_flush_size;
73 static unsigned int _parallel_worker_threads;
74 static bool _parallel_worker_threads_initialized;
75
76 static VirtualizationType _detected_virtualization;
77
78 static unsigned int nof_parallel_worker_threads(unsigned int num,
79 unsigned int dem,
80 unsigned int switch_pt);
81
82 public:
83 // Called as part of the runtime services initialization which is
84 // called from the management module initialization (via init_globals())
85 // after argument parsing and attaching of the main thread has
86 // occurred. Examines a variety of the hardware capabilities of
87 // the platform to determine which features can be used to execute the
88 // program.
89 static void initialize() { }
90
91 // This allows for early initialization of VM_Version information
92 // that may be needed later in the initialization sequence but before
93 // full VM_Version initialization is possible. It can not depend on any
94 // other part of the VM being initialized when called. Platforms that
95 // need to specialize this define VM_Version::early_initialize().
96 static void early_initialize() { }
97
98 // Called to initialize VM variables needing initialization
99 // after command line parsing. Platforms that need to specialize
100 // this should define VM_Version::init_before_ergo().
101 static void init_before_ergo() {}
102
103 // Name
104 static const char* vm_name();
105 // Vendor
106 static const char* vm_vendor();
107 // VM version information string printed by launcher (java -version)
108 static const char* vm_info_string();
109 static const char* vm_release();
110 static const char* vm_platform_string();
111 static const char* vm_build_user();
112
113 static int vm_major_version() { return _vm_major_version; }
114 static int vm_minor_version() { return _vm_minor_version; }
115 static int vm_security_version() { return _vm_security_version; }
116 static int vm_patch_version() { return _vm_patch_version; }
117 static int vm_build_number() { return _vm_build_number; }
118
119 // Gets the jvm_version_info.jvm_version defined in jvm.h
120 static unsigned int jvm_version();
121
122 // Internal version providing additional build information
123 static const char* internal_vm_info_string();
124 static const char* jre_release_version();
125 static const char* jdk_debug_level();
126 static const char* printable_jdk_debug_level();
127
128 static uint64_t features() { return _features; }
129 static const char* features_string() { return _features_string; }
130
131 static VirtualizationType get_detected_virtualization() {
132 return _detected_virtualization;
133 }
134
135 // platforms that need to specialize this
136 // define VM_Version::print_platform_virtualization_info()
137 static void print_platform_virtualization_info(outputStream*) { }
138
139 // does HW support an 8-byte compare-exchange operation?
140 static bool supports_cx8() {
141 #ifdef SUPPORTS_NATIVE_CX8
142 return true;
143 #else
144 return _supports_cx8;
145 #endif
146 }
147 // does HW support atomic get-and-set or atomic get-and-add? Used
148 // to guide intrinsification decisions for Unsafe atomic ops
149 static bool supports_atomic_getset4() {return _supports_atomic_getset4;}
150 static bool supports_atomic_getset8() {return _supports_atomic_getset8;}
151 static bool supports_atomic_getadd4() {return _supports_atomic_getadd4;}
152 static bool supports_atomic_getadd8() {return _supports_atomic_getadd8;}
153
154 static unsigned int logical_processors_per_package() {
155 return _logical_processors_per_package;
156 }
157
158 static unsigned int L1_data_cache_line_size() {
159 return _L1_data_cache_line_size;
160 }
161
162 // the size in bytes of a data cache line flushed by a flush
163 // operation which should be a power of two or zero if cache line
164 // writeback is not supported by the current os_cpu combination
165 static unsigned int data_cache_line_flush_size() {
166 return _data_cache_line_flush_size;
167 }
168
169 // returns true if and only if cache line writeback is supported
170 static bool supports_data_cache_line_flush() {
171 return _data_cache_line_flush_size != 0;
172 }
173
174 // ARCH specific policy for the BiasedLocking
175 static bool use_biased_locking() { return true; }
176
177 // Number of page sizes efficiently supported by the hardware. Most chips now
178 // support two sizes, thus this default implementation. Processor-specific
179 // subclasses should define new versions to hide this one as needed. Note
180 // that the O/S may support more sizes, but at most this many are used.
181 static uint page_size_count() { return 2; }
182
183 // Returns the number of parallel threads to be used for VM
184 // work. If that number has not been calculated, do so and
185 // save it. Returns ParallelGCThreads if it is set on the
186 // command line.
187 static unsigned int parallel_worker_threads();
188 // Calculates and returns the number of parallel threads. May
189 // be VM version specific.
190 static unsigned int calc_parallel_worker_threads();
191
192 // Does this CPU support spin wait instruction?
193 static bool supports_on_spin_wait() { return false; }
194
195 // Does platform support fast class initialization checks for static methods?
196 static bool supports_fast_class_init_checks() { return false; }
197
198 static bool print_matching_lines_from_file(const char* filename, outputStream* st, const char* keywords_to_match[]);
199 };
200
201 #endif // SHARE_RUNTIME_ABSTRACT_VM_VERSION_HPP