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