vm_version_sparc.hpp revision 1472:c18cbe5936b8 
1/*
2 * Copyright (c) 1997, 2009, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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5 * This code is free software; you can redistribute it and/or modify it
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7 * published by the Free Software Foundation.
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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.
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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23 */
24
25class VM_Version: public Abstract_VM_Version {
26protected:
27  enum Feature_Flag {
28    v8_instructions    = 0,
29    hardware_mul32     = 1,
30    hardware_div32     = 2,
31    hardware_fsmuld    = 3,
32    hardware_popc      = 4,
33    v9_instructions    = 5,
34    vis1_instructions  = 6,
35    vis2_instructions  = 7,
36    sun4v_instructions = 8
37  };
38
39  enum Feature_Flag_Set {
40    unknown_m           = 0,
41    all_features_m      = -1,
42
43    v8_instructions_m   = 1 << v8_instructions,
44    hardware_mul32_m    = 1 << hardware_mul32,
45    hardware_div32_m    = 1 << hardware_div32,
46    hardware_fsmuld_m   = 1 << hardware_fsmuld,
47    hardware_popc_m     = 1 << hardware_popc,
48    v9_instructions_m   = 1 << v9_instructions,
49    vis1_instructions_m = 1 << vis1_instructions,
50    vis2_instructions_m = 1 << vis2_instructions,
51    sun4v_m             = 1 << sun4v_instructions,
52
53    generic_v8_m        = v8_instructions_m | hardware_mul32_m | hardware_div32_m | hardware_fsmuld_m,
54    generic_v9_m        = generic_v8_m | v9_instructions_m,
55    ultra3_m            = generic_v9_m | vis1_instructions_m | vis2_instructions_m,
56
57    // Temporary until we have something more accurate
58    niagara1_unique_m   = sun4v_m,
59    niagara1_m          = generic_v9_m | niagara1_unique_m
60  };
61
62  static int  _features;
63  static const char* _features_str;
64
65  static void print_features();
66  static int  determine_features();
67  static int  platform_features(int features);
68
69  static bool is_niagara1(int features) { return (features & sun4v_m) != 0; }
70
71  static int maximum_niagara1_processor_count() { return 32; }
72  // Returns true if the platform is in the niagara line and
73  // newer than the niagara1.
74  static bool is_niagara1_plus();
75
76public:
77  // Initialization
78  static void initialize();
79
80  // Instruction support
81  static bool has_v8()                  { return (_features & v8_instructions_m) != 0; }
82  static bool has_v9()                  { return (_features & v9_instructions_m) != 0; }
83  static bool has_hardware_mul32()      { return (_features & hardware_mul32_m) != 0; }
84  static bool has_hardware_div32()      { return (_features & hardware_div32_m) != 0; }
85  static bool has_hardware_fsmuld()     { return (_features & hardware_fsmuld_m) != 0; }
86  static bool has_hardware_popc()       { return (_features & hardware_popc_m) != 0; }
87  static bool has_vis1()                { return (_features & vis1_instructions_m) != 0; }
88  static bool has_vis2()                { return (_features & vis2_instructions_m) != 0; }
89
90  static bool supports_compare_and_exchange()
91                                        { return has_v9(); }
92
93  static bool is_ultra3()               { return (_features & ultra3_m) == ultra3_m; }
94  static bool is_sun4v()                { return (_features & sun4v_m) != 0; }
95  static bool is_niagara1()             { return is_niagara1(_features); }
96
97  static bool has_fast_fxtof()          { return has_v9() && !is_ultra3(); }
98
99  static const char* cpu_features()     { return _features_str; }
100
101  static intx L1_data_cache_line_size()  {
102    return 64;  // default prefetch block size on sparc
103  }
104
105  // Prefetch
106  static intx prefetch_copy_interval_in_bytes() {
107    intx interval = PrefetchCopyIntervalInBytes;
108    return interval >= 0 ? interval : (has_v9() ? 512 : 0);
109  }
110  static intx prefetch_scan_interval_in_bytes() {
111    intx interval = PrefetchScanIntervalInBytes;
112    return interval >= 0 ? interval : (has_v9() ? 512 : 0);
113  }
114  static intx prefetch_fields_ahead() {
115    intx count = PrefetchFieldsAhead;
116    return count >= 0 ? count : (is_ultra3() ? 1 : 0);
117  }
118
119  static intx allocate_prefetch_distance() {
120    // This method should be called before allocate_prefetch_style().
121    intx count = AllocatePrefetchDistance;
122    if (count < 0) { // default is not defined ?
123      count = 512;
124    }
125    return count;
126  }
127  static intx allocate_prefetch_style() {
128    assert(AllocatePrefetchStyle >= 0, "AllocatePrefetchStyle should be positive");
129    // Return 0 if AllocatePrefetchDistance was not defined.
130    return AllocatePrefetchDistance > 0 ? AllocatePrefetchStyle : 0;
131  }
132
133  // Legacy
134  static bool v8_instructions_work() { return has_v8() && !has_v9(); }
135  static bool v9_instructions_work() { return has_v9(); }
136
137  // Assembler testing
138  static void allow_all();
139  static void revert();
140
141  // Override the Abstract_VM_Version implementation.
142  static uint page_size_count() { return is_sun4v() ? 4 : 2; }
143
144  // Calculates the number of parallel threads
145  static unsigned int calc_parallel_worker_threads();
146};
147