1 /*
2 * Copyright (c) 1997, 2014, 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
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23 */
24
25 #ifndef SHARE_VM_RUNTIME_VM_VERSION_HPP
26 #define SHARE_VM_RUNTIME_VM_VERSION_HPP
27
28 #include "memory/allocation.hpp"
29 #include "utilities/ostream.hpp"
30
31 typedef enum {
32 NoDetectedVirtualization,
33 XenHVM,
34 KVM,
35 VMWare,
36 HyperV,
37 PowerVM, // on AIX or Linux ppc64(le)
38 PowerFullPartitionMode, // on Linux ppc64(le)
39 PowerKVM
40 } VirtualizationType;
41
42 // VM_Version provides information about the VM.
43
44 class Abstract_VM_Version: AllStatic {
45 protected:
46 friend class VMStructs;
47 static const char* _s_vm_release;
48 static const char* _s_internal_vm_info_string;
49 // These are set by machine-dependent initializations
50 static bool _supports_cx8;
51 static bool _supports_atomic_getset4;
52 static bool _supports_atomic_getset8;
53 static bool _supports_atomic_getadd4;
54 static bool _supports_atomic_getadd8;
55 static unsigned int _logical_processors_per_package;
56 static unsigned int _L1_data_cache_line_size;
57 static int _vm_major_version;
58 static int _vm_minor_version;
59 static int _vm_build_number;
60 static bool _initialized;
61 static int _parallel_worker_threads;
62 static bool _parallel_worker_threads_initialized;
63 static int _reserve_for_allocation_prefetch;
64
65 static unsigned int nof_parallel_worker_threads(unsigned int num,
66 unsigned int dem,
67 unsigned int switch_pt);
68 static VirtualizationType _detected_virtualization;
69
70 public:
71 // Called as part of the runtime services initialization which is
72 // called from the management module initialization (via init_globals())
73 // after argument parsing and attaching of the main thread has
74 // occurred. Examines a variety of the hardware capabilities of
75 // the platform to determine which features can be used to execute the
76 // program.
77 static void initialize();
78
79 // This allows for early initialization of VM_Version information
80 // that may be needed later in the initialization sequence but before
81 // full VM_Version initialization is possible. It can not depend on any
82 // other part of the VM being initialized when called. Platforms that
83 // need to specialize this define VM_Version::early_initialize().
84 static void early_initialize() { }
85
86 // Called to initialize VM variables needing initialization
87 // after command line parsing. Platforms that need to specialize
88 // this should define VM_Version::init_before_ergo().
89 static void init_before_ergo() {}
90
91 // Name
92 static const char* vm_name();
93 // Vendor
94 static const char* vm_vendor();
95 // VM version information string printed by launcher (java -version)
96 static const char* vm_info_string();
97 static const char* vm_release();
98 static const char* vm_platform_string();
99 static const char* vm_build_user();
100
101 static int vm_major_version() { assert(_initialized, "not initialized"); return _vm_major_version; }
102 static int vm_minor_version() { assert(_initialized, "not initialized"); return _vm_minor_version; }
103 static int vm_build_number() { assert(_initialized, "not initialized"); return _vm_build_number; }
104
105 // Gets the jvm_version_info.jvm_version defined in jvm.h
106 static unsigned int jvm_version();
107
108 // Internal version providing additional build information
109 static const char* internal_vm_info_string();
110 static const char* jre_release_version();
111
112 static VirtualizationType get_detected_virtualization() {
113 return _detected_virtualization;
114 }
115
116 // platforms that need to specialize this
117 // define VM_Version::print_platform_virtualization_info()
118 static void print_platform_virtualization_info(outputStream*) { }
119
120 // does HW support an 8-byte compare-exchange operation?
121 static bool supports_cx8() {
122 assert(_initialized, "not initialized");
123 #ifdef SUPPORTS_NATIVE_CX8
124 return true;
125 #else
126 return _supports_cx8;
127 #endif
128 }
129 // does HW support atomic get-and-set or atomic get-and-add? Used
130 // to guide intrinsification decisions for Unsafe atomic ops
131 static bool supports_atomic_getset4() { assert(_initialized, "not initialized"); return _supports_atomic_getset4;}
132 static bool supports_atomic_getset8() { assert(_initialized, "not initialized"); return _supports_atomic_getset8;}
133 static bool supports_atomic_getadd4() { assert(_initialized, "not initialized"); return _supports_atomic_getadd4;}
134 static bool supports_atomic_getadd8() { assert(_initialized, "not initialized"); return _supports_atomic_getadd8;}
135
136 static unsigned int logical_processors_per_package() {
137 return _logical_processors_per_package;
138 }
139
140 static unsigned int L1_data_cache_line_size() {
141 return _L1_data_cache_line_size;
142 }
143
144 // Need a space at the end of TLAB for prefetch instructions
145 // which may fault when accessing memory outside of heap.
146 static int reserve_for_allocation_prefetch() {
147 return _reserve_for_allocation_prefetch;
148 }
149
150 // ARCH specific policy for the BiasedLocking
151 static bool use_biased_locking() { return true; }
152
153 // Number of page sizes efficiently supported by the hardware. Most chips now
154 // support two sizes, thus this default implementation. Processor-specific
155 // subclasses should define new versions to hide this one as needed. Note
156 // that the O/S may support more sizes, but at most this many are used.
157 static uint page_size_count() { return 2; }
158
159 // Returns the number of parallel threads to be used for VM
160 // work. If that number has not been calculated, do so and
161 // save it. Returns ParallelGCThreads if it is set on the
162 // command line.
163 static unsigned int parallel_worker_threads();
164 // Calculates and returns the number of parallel threads. May
165 // be VM version specific.
166 static unsigned int calc_parallel_worker_threads();
167
168 static bool print_matching_lines_from_file(const char* filename, outputStream* st, const char* keywords_to_match[]);
169 };
170
171 #endif // SHARE_VM_RUNTIME_VM_VERSION_HPP