1 /*
2 * Copyright (c) 1997, 2023, 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
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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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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 XenPVHVM, // mix-mode on Linux aarch64
35 KVM,
36 VMWare,
37 HyperV,
38 HyperVRole,
39 PowerVM, // on AIX or Linux ppc64(le)
40 PowerFullPartitionMode, // on Linux ppc64(le)
41 PowerKVM
42 } VirtualizationType;
43
44 class outputStream;
45
46 // Abstract_VM_Version provides information about the VM.
47
48 class Abstract_VM_Version: AllStatic {
49 friend class VMStructs;
50 friend class JVMCIVMStructs;
51
52 protected:
53 static const char* _s_vm_release;
54 static const char* _s_internal_vm_info_string;
55
56 // CPU feature flags.
57 static uint64_t _features;
58 static const char* _features_string;
59
60 // These are set by machine-dependent initializations
61 static bool _supports_cx8;
62 static bool _supports_atomic_getset4;
63 static bool _supports_atomic_getset8;
64 static bool _supports_atomic_getadd4;
65 static bool _supports_atomic_getadd8;
66 static unsigned int _logical_processors_per_package;
67 static unsigned int _L1_data_cache_line_size;
68 static int _vm_major_version;
69 static int _vm_minor_version;
70 static int _vm_security_version;
71 static int _vm_patch_version;
72 static int _vm_build_number;
73 static unsigned int _data_cache_line_flush_size;
74
75 public:
76
77 static VirtualizationType _detected_virtualization;
78
79 // Called as part of the runtime services initialization which is
80 // called from the management module initialization (via init_globals())
81 // after argument parsing and attaching of the main thread has
82 // occurred. Examines a variety of the hardware capabilities of
83 // the platform to determine which features can be used to execute the
84 // program.
85 static void initialize() { }
86
87 // This allows for early initialization of VM_Version information
88 // that may be needed later in the initialization sequence but before
89 // full VM_Version initialization is possible. It can not depend on any
90 // other part of the VM being initialized when called. Platforms that
91 // need to specialize this define VM_Version::early_initialize().
92 static void early_initialize() { }
93
94 // Called to initialize VM variables needing initialization
95 // after command line parsing. Platforms that need to specialize
96 // this should define VM_Version::init_before_ergo().
97 static void init_before_ergo() {}
98
99 // Name
100 static const char* vm_name();
101 // Vendor
102 static const char* vm_vendor();
103 // VM version information string printed by launcher (java -version)
104 static const char* vm_info_string();
105 static const char* vm_release();
106 static const char* vm_platform_string();
107 static const char* vm_build_user();
108
109 static int vm_major_version() { return _vm_major_version; }
110 static int vm_minor_version() { return _vm_minor_version; }
111 static int vm_security_version() { return _vm_security_version; }
112 static int vm_patch_version() { return _vm_patch_version; }
113 static int vm_build_number() { return _vm_build_number; }
114
115 // Gets the jvm_version_info.jvm_version
116 static unsigned int jvm_version();
117
118 // Internal version providing additional build information
119 static const char* internal_vm_info_string();
120 static const char* jre_release_version();
121 static const char* jdk_debug_level();
122 static const char* printable_jdk_debug_level();
123
124 static uint64_t features() { return _features; }
125 static const char* features_string() { return _features_string; }
126 static void insert_features_names(char* buf, size_t buflen, const char* features_names[]);
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 // Does platform support stack watermark barriers for concurrent stack processing?
191 constexpr static bool supports_stack_watermark_barrier() { return false; }
192
193 static bool print_matching_lines_from_file(const char* filename, outputStream* st, const char* keywords_to_match[]);
194 };
195
196 #endif // SHARE_RUNTIME_ABSTRACT_VM_VERSION_HPP