/*
 * Copyright 1997-2008 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_int_muldiv = 1,
    hardware_fsmuld     = 2,
    v9_instructions     = 3,
    vis1_instructions   = 4,
    vis2_instructions   = 5,
    sun4v_instructions  = 6
  };

  enum Feature_Flag_Set {
    unknown_m             = 0,
    all_features_m        = -1,

    v8_instructions_m     = 1 << v8_instructions,
    hardware_int_muldiv_m = 1 << hardware_int_muldiv,
    hardware_fsmuld_m     = 1 << hardware_fsmuld,
    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_int_muldiv_m | hardware_fsmuld_m,
    generic_v9_m          = generic_v8_m | v9_instructions_m | vis1_instructions_m,
    ultra3_m              = generic_v9_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 & niagara1_m) == niagara1_m; }

  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_int_muldiv() { return (_features & hardware_int_muldiv_m) != 0; }
  static bool has_hardware_fsmuld()     { return (_features & hardware_fsmuld_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();
};