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