vm_version_sparc.hpp revision 10:28372612af5e 
1/*
2 * Copyright 1997-2007 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25class VM_Version: public Abstract_VM_Version {
26protected:
27  enum Feature_Flag {
28    v8_instructions     = 0,
29    hardware_int_muldiv = 1,
30    hardware_fsmuld     = 2,
31    v9_instructions     = 3,
32    vis1_instructions   = 4,
33    vis2_instructions   = 5,
34    sun4v_instructions  = 6
35  };
36
37  enum Feature_Flag_Set {
38    unknown_m             = 0,
39    all_features_m        = -1,
40
41    v8_instructions_m     = 1 << v8_instructions,
42    hardware_int_muldiv_m = 1 << hardware_int_muldiv,
43    hardware_fsmuld_m     = 1 << hardware_fsmuld,
44    v9_instructions_m     = 1 << v9_instructions,
45    vis1_instructions_m   = 1 << vis1_instructions,
46    vis2_instructions_m   = 1 << vis2_instructions,
47    sun4v_m               = 1 << sun4v_instructions,
48
49    generic_v8_m          = v8_instructions_m | hardware_int_muldiv_m | hardware_fsmuld_m,
50    generic_v9_m          = generic_v8_m | v9_instructions_m | vis1_instructions_m,
51    ultra3_m              = generic_v9_m | vis2_instructions_m,
52
53    // Temporary until we have something more accurate
54    niagara1_unique_m     = sun4v_m,
55    niagara1_m            = generic_v9_m | niagara1_unique_m
56  };
57
58  static int  _features;
59  static const char* _features_str;
60
61  static void print_features();
62  static int  determine_features();
63  static int  platform_features(int features);
64
65  static bool is_niagara1(int features) { return (features & niagara1_m) == niagara1_m; }
66
67  static int maximum_niagara1_processor_count() { return 32; }
68  // Returns true if the platform is in the niagara line and
69  // newer than the niagara1.
70  static bool is_niagara1_plus();
71
72public:
73  // Initialization
74  static void initialize();
75
76  // Instruction support
77  static bool has_v8()                  { return (_features & v8_instructions_m) != 0; }
78  static bool has_v9()                  { return (_features & v9_instructions_m) != 0; }
79  static bool has_hardware_int_muldiv() { return (_features & hardware_int_muldiv_m) != 0; }
80  static bool has_hardware_fsmuld()     { return (_features & hardware_fsmuld_m) != 0; }
81  static bool has_vis1()                { return (_features & vis1_instructions_m) != 0; }
82  static bool has_vis2()                { return (_features & vis2_instructions_m) != 0; }
83
84  static bool supports_compare_and_exchange()
85                                        { return has_v9(); }
86
87  static bool is_ultra3()               { return (_features & ultra3_m) == ultra3_m; }
88  static bool is_sun4v()                { return (_features & sun4v_m) != 0; }
89  static bool is_niagara1()             { return is_niagara1(_features); }
90
91  static bool has_fast_fxtof()          { return has_v9() && !is_ultra3(); }
92
93  static const char* cpu_features()     { return _features_str; }
94
95  static intx L1_data_cache_line_size()  {
96    return 64;  // default prefetch block size on sparc
97  }
98
99  // Prefetch
100  static intx prefetch_copy_interval_in_bytes() {
101    intx interval = PrefetchCopyIntervalInBytes;
102    return interval >= 0 ? interval : (has_v9() ? 512 : 0);
103  }
104  static intx prefetch_scan_interval_in_bytes() {
105    intx interval = PrefetchScanIntervalInBytes;
106    return interval >= 0 ? interval : (has_v9() ? 512 : 0);
107  }
108  static intx prefetch_fields_ahead() {
109    intx count = PrefetchFieldsAhead;
110    return count >= 0 ? count : (is_ultra3() ? 1 : 0);
111  }
112
113  static intx allocate_prefetch_distance() {
114    // This method should be called before allocate_prefetch_style().
115    intx count = AllocatePrefetchDistance;
116    if (count < 0) { // default is not defined ?
117      count = 512;
118    }
119    return count;
120  }
121  static intx allocate_prefetch_style() {
122    assert(AllocatePrefetchStyle >= 0, "AllocatePrefetchStyle should be positive");
123    // Return 0 if AllocatePrefetchDistance was not defined.
124    return AllocatePrefetchDistance > 0 ? AllocatePrefetchStyle : 0;
125  }
126
127  // Legacy
128  static bool v8_instructions_work() { return has_v8() && !has_v9(); }
129  static bool v9_instructions_work() { return has_v9(); }
130
131  // Assembler testing
132  static void allow_all();
133  static void revert();
134
135  // Override the Abstract_VM_Version implementation.
136  static uint page_size_count() { return is_sun4v() ? 4 : 2; }
137
138  // Calculates the number of parallel threads
139  static unsigned int calc_parallel_worker_threads();
140};
141