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_ABSTRACT_VM_VERSION_HPP
26 #define SHARE_RUNTIME_ABSTRACT_VM_VERSION_HPP
27
28 #include "memory/allocation.hpp" // For declaration of class AllStatic
29
30 typedef enum {
31 NoDetectedVirtualization,
32 XenHVM,
33 KVM,
34 VMWare,
35 HyperV,
36 PowerVM, // on AIX or Linux ppc64(le)
37 PowerFullPartitionMode, // on Linux ppc64(le)
38 PowerKVM
39 } VirtualizationType;
40
41 // VM_Version provides information about the VM.
42
43 class Abstract_VM_Version: AllStatic {
44 friend class VMStructs;
45 friend class JVMCIVMStructs;
46
47 protected:
48 static const char* _s_vm_release;
49 static const char* _s_internal_vm_info_string;
50
51 // CPU feature flags.
52 static uint64_t _features;
53 static const char* _features_string;
54
55 // These are set by machine-dependent initializations
56 static bool _supports_cx8;
57 static bool _supports_atomic_getset4;
58 static bool _supports_atomic_getset8;
59 static bool _supports_atomic_getadd4;
60 static bool _supports_atomic_getadd8;
61 static unsigned int _logical_processors_per_package;
62 static unsigned int _L1_data_cache_line_size;
63 static int _vm_major_version;
64 static int _vm_minor_version;
65 static int _vm_security_version;
66 static int _vm_patch_version;
67 static int _vm_build_number;
68 static unsigned int _data_cache_line_flush_size;
69
70 static VirtualizationType _detected_virtualization;
71
72 public:
73 // Called as part of the runtime services initialization which is
74 // called from the management module initialization (via init_globals())
75 // after argument parsing and attaching of the main thread has
76 // occurred. Examines a variety of the hardware capabilities of
77 // the platform to determine which features can be used to execute the
78 // program.
79 static void initialize() { }
80
81 // This allows for early initialization of VM_Version information
82 // that may be needed later in the initialization sequence but before
83 // full VM_Version initialization is possible. It can not depend on any
84 // other part of the VM being initialized when called. Platforms that
85 // need to specialize this define VM_Version::early_initialize().
86 static void early_initialize() { }
87
88 // Called to initialize VM variables needing initialization
89 // after command line parsing. Platforms that need to specialize
90 // this should define VM_Version::init_before_ergo().
91 static void init_before_ergo() {}
92
93 // Name
94 static const char* vm_name();
95 // Vendor
96 static const char* vm_vendor();
97 // VM version information string printed by launcher (java -version)
98 static const char* vm_info_string();
99 static const char* vm_release();
100 static const char* vm_platform_string();
101 static const char* vm_build_user();
102
103 static int vm_major_version() { return _vm_major_version; }
104 static int vm_minor_version() { return _vm_minor_version; }
105 static int vm_security_version() { return _vm_security_version; }
106 static int vm_patch_version() { return _vm_patch_version; }
107 static int vm_build_number() { return _vm_build_number; }
108
109 // Gets the jvm_version_info.jvm_version defined in jvm.h
110 static unsigned int jvm_version();
111
112 // Internal version providing additional build information
113 static const char* internal_vm_info_string();
114 static const char* jre_release_version();
115 static const char* jdk_debug_level();
116 static const char* printable_jdk_debug_level();
117
118 static uint64_t features() {
119 return _features;
120 }
121
122 static const char* features_string() {
123 return _features_string;
124 }
125
126 static VirtualizationType get_detected_virtualization() {
127 return _detected_virtualization;
128 }
129
130 // platforms that need to specialize this
131 // define VM_Version::print_platform_virtualization_info()
132 static void print_platform_virtualization_info(outputStream*) { }
133
134 // does HW support an 8-byte compare-exchange operation?
135 static bool supports_cx8() {
136 #ifdef SUPPORTS_NATIVE_CX8
137 return true;
138 #else
139 return _supports_cx8;
140 #endif
141 }
142 // does HW support atomic get-and-set or atomic get-and-add? Used
143 // to guide intrinsification decisions for Unsafe atomic ops
144 static bool supports_atomic_getset4() {return _supports_atomic_getset4;}
145 static bool supports_atomic_getset8() {return _supports_atomic_getset8;}
146 static bool supports_atomic_getadd4() {return _supports_atomic_getadd4;}
147 static bool supports_atomic_getadd8() {return _supports_atomic_getadd8;}
148
149 static unsigned int logical_processors_per_package() {
150 return _logical_processors_per_package;
151 }
152
153 static unsigned int L1_data_cache_line_size() {
154 return _L1_data_cache_line_size;
155 }
156
157 // the size in bytes of a data cache line flushed by a flush
158 // operation which should be a power of two or zero if cache line
159 // writeback is not supported by the current os_cpu combination
160 static unsigned int data_cache_line_flush_size() {
161 return _data_cache_line_flush_size;
162 }
163
164 // returns true if and only if cache line writeback is supported
165 static bool supports_data_cache_line_flush() {
166 return _data_cache_line_flush_size != 0;
167 }
168
169 // ARCH specific policy for the BiasedLocking
170 static bool use_biased_locking() { return true; }
171
172 // Number of page sizes efficiently supported by the hardware. Most chips now
173 // support two sizes, thus this default implementation. Processor-specific
174 // subclasses should define new versions to hide this one as needed. Note
175 // that the O/S may support more sizes, but at most this many are used.
176 static uint page_size_count() { return 2; }
177
178 // Denominator for computing default ParallelGCThreads for machines with
179 // a large number of cores.
180 static uint parallel_worker_threads_denominator() { return 8; }
181
182 // Does this CPU support spin wait instruction?
183 static bool supports_on_spin_wait() { return false; }
184
185 // Does platform support fast class initialization checks for static methods?
186 static bool supports_fast_class_init_checks() { return false; }
187
188 static bool print_matching_lines_from_file(const char* filename, outputStream* st, const char* keywords_to_match[]);
189 };
190
191 #endif // SHARE_RUNTIME_ABSTRACT_VM_VERSION_HPP