Mercurial > jdk8-mips64-public > hotspot / file revision

 /*

  * Copyright 1997-2009 Sun Microsystems, Inc.  All Rights Reserved.

  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

  *

  * This code is free software; you can redistribute it and/or modify it

  * under the terms of the GNU General Public License version 2 only, as

  * published by the Free Software Foundation.

  *

  * This code is distributed in the hope that it will be useful, but WITHOUT

  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

  * version 2 for more details (a copy is included in the LICENSE file that

  * accompanied this code).

  *

  * You should have received a copy of the GNU General Public License version

  * 2 along with this work; if not, write to the Free Software Foundation,

  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

  *

  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

  * CA 95054 USA or visit www.sun.com if you need additional information or

  * have any questions.

  *

  */

 class VM_Version: public Abstract_VM_Version {

 protected:

   enum Feature_Flag {

     v8_instructions    = 0,

     hardware_mul32     = 1,

     hardware_div32     = 2,

     hardware_fsmuld    = 3,

     hardware_popc      = 4,

     v9_instructions    = 5,

     vis1_instructions  = 6,

     vis2_instructions  = 7,

     sun4v_instructions = 8

   };

   enum Feature_Flag_Set {

     unknown_m           = 0,

     all_features_m      = -1,

     v8_instructions_m   = 1 << v8_instructions,

     hardware_mul32_m    = 1 << hardware_mul32,

     hardware_div32_m    = 1 << hardware_div32,

     hardware_fsmuld_m   = 1 << hardware_fsmuld,

     hardware_popc_m     = 1 << hardware_popc,

     v9_instructions_m   = 1 << v9_instructions,

     vis1_instructions_m = 1 << vis1_instructions,

     vis2_instructions_m = 1 << vis2_instructions,

     sun4v_m             = 1 << sun4v_instructions,

     generic_v8_m        = v8_instructions_m | hardware_mul32_m | hardware_div32_m | hardware_fsmuld_m,

     generic_v9_m        = generic_v8_m | v9_instructions_m,

     ultra3_m            = generic_v9_m | vis1_instructions_m | vis2_instructions_m,

     // Temporary until we have something more accurate

     niagara1_unique_m   = sun4v_m,

     niagara1_m          = generic_v9_m | niagara1_unique_m

   };

   static int  _features;

   static const char* _features_str;

   static void print_features();

   static int  determine_features();

   static int  platform_features(int features);

   static bool is_niagara1(int features) { return (features & sun4v_m) != 0; }

   static int maximum_niagara1_processor_count() { return 32; }

   // Returns true if the platform is in the niagara line and

   // newer than the niagara1.

   static bool is_niagara1_plus();

 public:

   // Initialization

   static void initialize();

   // Instruction support

   static bool has_v8()                  { return (_features & v8_instructions_m) != 0; }

   static bool has_v9()                  { return (_features & v9_instructions_m) != 0; }

   static bool has_hardware_mul32()      { return (_features & hardware_mul32_m) != 0; }

   static bool has_hardware_div32()      { return (_features & hardware_div32_m) != 0; }

   static bool has_hardware_fsmuld()     { return (_features & hardware_fsmuld_m) != 0; }

   static bool has_hardware_popc()       { return (_features & hardware_popc_m) != 0; }

   static bool has_vis1()                { return (_features & vis1_instructions_m) != 0; }

   static bool has_vis2()                { return (_features & vis2_instructions_m) != 0; }

   static bool supports_compare_and_exchange()

                                         { return has_v9(); }

   static bool is_ultra3()               { return (_features & ultra3_m) == ultra3_m; }

   static bool is_sun4v()                { return (_features & sun4v_m) != 0; }

   static bool is_niagara1()             { return is_niagara1(_features); }

   static bool has_fast_fxtof()          { return has_v9() && !is_ultra3(); }

   static const char* cpu_features()     { return _features_str; }

   static intx L1_data_cache_line_size()  {

     return 64;  // default prefetch block size on sparc

   }

   // Prefetch

   static intx prefetch_copy_interval_in_bytes() {

     intx interval = PrefetchCopyIntervalInBytes;

     return interval >= 0 ? interval : (has_v9() ? 512 : 0);

   }

   static intx prefetch_scan_interval_in_bytes() {

     intx interval = PrefetchScanIntervalInBytes;

     return interval >= 0 ? interval : (has_v9() ? 512 : 0);

   }

   static intx prefetch_fields_ahead() {

     intx count = PrefetchFieldsAhead;

     return count >= 0 ? count : (is_ultra3() ? 1 : 0);

   }

   static intx allocate_prefetch_distance() {

     // This method should be called before allocate_prefetch_style().

     intx count = AllocatePrefetchDistance;

     if (count < 0) { // default is not defined ?

       count = 512;

     }

     return count;

   }

   static intx allocate_prefetch_style() {

     assert(AllocatePrefetchStyle >= 0, "AllocatePrefetchStyle should be positive");

     // Return 0 if AllocatePrefetchDistance was not defined.

     return AllocatePrefetchDistance > 0 ? AllocatePrefetchStyle : 0;

   }

   // Legacy

   static bool v8_instructions_work() { return has_v8() && !has_v9(); }

   static bool v9_instructions_work() { return has_v9(); }

   // Assembler testing

   static void allow_all();

   static void revert();

   // Override the Abstract_VM_Version implementation.

   static uint page_size_count() { return is_sun4v() ? 4 : 2; }

   // Calculates the number of parallel threads

   static unsigned int calc_parallel_worker_threads();

 };