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1 /*
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2 * Copyright 1997-2007 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 class VM_Version: public Abstract_VM_Version {
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26 protected:
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27 enum Feature_Flag {
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28 v8_instructions = 0,
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29 hardware_int_muldiv = 1,
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30 hardware_fsmuld = 2,
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31 v9_instructions = 3,
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32 vis1_instructions = 4,
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33 vis2_instructions = 5,
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34 sun4v_instructions = 6
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35 };
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36
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37 enum Feature_Flag_Set {
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38 unknown_m = 0,
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39 all_features_m = -1,
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40
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41 v8_instructions_m = 1 << v8_instructions,
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42 hardware_int_muldiv_m = 1 << hardware_int_muldiv,
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43 hardware_fsmuld_m = 1 << hardware_fsmuld,
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44 v9_instructions_m = 1 << v9_instructions,
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45 vis1_instructions_m = 1 << vis1_instructions,
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46 vis2_instructions_m = 1 << vis2_instructions,
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47 sun4v_m = 1 << sun4v_instructions,
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48
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49 generic_v8_m = v8_instructions_m | hardware_int_muldiv_m | hardware_fsmuld_m,
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50 generic_v9_m = generic_v8_m | v9_instructions_m | vis1_instructions_m,
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51 ultra3_m = generic_v9_m | vis2_instructions_m,
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52
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53 // Temporary until we have something more accurate
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54 niagara1_unique_m = sun4v_m,
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55 niagara1_m = generic_v9_m | niagara1_unique_m
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56 };
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57
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58 static int _features;
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59 static const char* _features_str;
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60
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61 static void print_features();
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62 static int determine_features();
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63 static int platform_features(int features);
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64
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65 static bool is_niagara1(int features) { return (features & niagara1_m) == niagara1_m; }
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66
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67 public:
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68 // Initialization
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69 static void initialize();
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70
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71 // Instruction support
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72 static bool has_v8() { return (_features & v8_instructions_m) != 0; }
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73 static bool has_v9() { return (_features & v9_instructions_m) != 0; }
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74 static bool has_hardware_int_muldiv() { return (_features & hardware_int_muldiv_m) != 0; }
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75 static bool has_hardware_fsmuld() { return (_features & hardware_fsmuld_m) != 0; }
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76 static bool has_vis1() { return (_features & vis1_instructions_m) != 0; }
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77 static bool has_vis2() { return (_features & vis2_instructions_m) != 0; }
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78
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79 static bool supports_compare_and_exchange()
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80 { return has_v9(); }
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81
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82 static bool is_ultra3() { return (_features & ultra3_m) == ultra3_m; }
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83 static bool is_sun4v() { return (_features & sun4v_m) != 0; }
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84 static bool is_niagara1() { return is_niagara1(_features); }
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85
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86 static bool has_fast_fxtof() { return has_v9() && !is_ultra3(); }
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87
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88 static const char* cpu_features() { return _features_str; }
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89
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90 static intx L1_data_cache_line_size() {
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91 return 64; // default prefetch block size on sparc
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92 }
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93
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94 // Prefetch
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95 static intx prefetch_copy_interval_in_bytes() {
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96 intx interval = PrefetchCopyIntervalInBytes;
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97 return interval >= 0 ? interval : (has_v9() ? 512 : 0);
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98 }
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99 static intx prefetch_scan_interval_in_bytes() {
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100 intx interval = PrefetchScanIntervalInBytes;
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101 return interval >= 0 ? interval : (has_v9() ? 512 : 0);
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102 }
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103 static intx prefetch_fields_ahead() {
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104 intx count = PrefetchFieldsAhead;
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105 return count >= 0 ? count : (is_ultra3() ? 1 : 0);
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106 }
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107
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108 static intx allocate_prefetch_distance() {
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109 // This method should be called before allocate_prefetch_style().
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110 intx count = AllocatePrefetchDistance;
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111 if (count < 0) { // default is not defined ?
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112 count = 512;
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113 }
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114 return count;
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115 }
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116 static intx allocate_prefetch_style() {
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117 assert(AllocatePrefetchStyle >= 0, "AllocatePrefetchStyle should be positive");
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118 // Return 0 if AllocatePrefetchDistance was not defined.
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119 return AllocatePrefetchDistance > 0 ? AllocatePrefetchStyle : 0;
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120 }
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121
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122 // Legacy
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123 static bool v8_instructions_work() { return has_v8() && !has_v9(); }
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124 static bool v9_instructions_work() { return has_v9(); }
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125
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126 // Assembler testing
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127 static void allow_all();
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128 static void revert();
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129
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130 // Override the Abstract_VM_Version implementation.
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131 static uint page_size_count() { return is_sun4v() ? 4 : 2; }
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132 };
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