1 /* |
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2 * Copyright (c) 1998, 2007, Oracle and/or its affiliates. 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. Oracle designates this |
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8 * particular file as subject to the "Classpath" exception as provided |
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9 * by Oracle in the LICENSE file that accompanied this code. |
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10 * |
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11 * This code is distributed in the hope that it will be useful, but WITHOUT |
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12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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14 * version 2 for more details (a copy is included in the LICENSE file that |
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15 * accompanied this code). |
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16 * |
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17 * You should have received a copy of the GNU General Public License version |
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18 * 2 along with this work; if not, write to the Free Software Foundation, |
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19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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20 * |
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21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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22 * or visit www.oracle.com if you need additional information or have any |
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23 * questions. |
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24 */ |
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25 |
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26 #include "ergo.h" |
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27 |
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28 static unsigned long physical_processors(void); |
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29 |
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30 #ifdef __solaris__ |
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31 |
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32 /* |
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33 * A utility method for asking the CPU about itself. |
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34 * There's a corresponding version of linux-i586 |
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35 * because the compilers are different. |
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36 */ |
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37 static void |
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38 get_cpuid(uint32_t arg, |
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39 uint32_t* eaxp, |
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40 uint32_t* ebxp, |
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41 uint32_t* ecxp, |
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42 uint32_t* edxp) { |
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43 #ifdef _LP64 |
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44 asm( |
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45 /* rbx is a callee-saved register */ |
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46 " movq %rbx, %r11 \n" |
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47 /* rdx and rcx are 3rd and 4th argument registers */ |
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48 " movq %rdx, %r10 \n" |
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49 " movq %rcx, %r9 \n" |
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50 " movl %edi, %eax \n" |
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51 " cpuid \n" |
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52 " movl %eax, (%rsi)\n" |
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53 " movl %ebx, (%r10)\n" |
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54 " movl %ecx, (%r9) \n" |
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55 " movl %edx, (%r8) \n" |
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56 /* Restore rbx */ |
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57 " movq %r11, %rbx"); |
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58 #else |
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59 /* EBX is a callee-saved register */ |
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60 asm(" pushl %ebx"); |
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61 /* Need ESI for storing through arguments */ |
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62 asm(" pushl %esi"); |
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63 asm(" movl 8(%ebp), %eax \n" |
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64 " cpuid \n" |
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65 " movl 12(%ebp), %esi \n" |
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66 " movl %eax, (%esi) \n" |
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67 " movl 16(%ebp), %esi \n" |
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68 " movl %ebx, (%esi) \n" |
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69 " movl 20(%ebp), %esi \n" |
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70 " movl %ecx, (%esi) \n" |
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71 " movl 24(%ebp), %esi \n" |
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72 " movl %edx, (%esi) "); |
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73 /* Restore ESI and EBX */ |
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74 asm(" popl %esi"); |
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75 /* Restore EBX */ |
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76 asm(" popl %ebx"); |
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77 #endif /* LP64 */ |
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78 } |
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79 |
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80 /* The definition of a server-class machine for solaris-i586/amd64 */ |
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81 jboolean |
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82 ServerClassMachineImpl(void) { |
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83 jboolean result = JNI_FALSE; |
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84 /* How big is a server class machine? */ |
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85 const unsigned long server_processors = 2UL; |
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86 const uint64_t server_memory = 2UL * GB; |
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87 /* |
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88 * We seem not to get our full complement of memory. |
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89 * We allow some part (1/8?) of the memory to be "missing", |
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90 * based on the sizes of DIMMs, and maybe graphics cards. |
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91 */ |
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92 const uint64_t missing_memory = 256UL * MB; |
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93 const uint64_t actual_memory = physical_memory(); |
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94 |
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95 /* Is this a server class machine? */ |
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96 if (actual_memory >= (server_memory - missing_memory)) { |
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97 const unsigned long actual_processors = physical_processors(); |
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98 if (actual_processors >= server_processors) { |
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99 result = JNI_TRUE; |
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100 } |
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101 } |
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102 JLI_TraceLauncher("solaris_" LIBARCHNAME "_ServerClassMachine: %s\n", |
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103 (result == JNI_TRUE ? "true" : "false")); |
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104 return result; |
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105 } |
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106 |
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107 #endif /* __solaris__ */ |
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108 |
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109 #ifdef __linux__ |
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110 |
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111 /* |
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112 * A utility method for asking the CPU about itself. |
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113 * There's a corresponding version of solaris-i586 |
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114 * because the compilers are different. |
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115 */ |
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116 static void |
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117 get_cpuid(uint32_t arg, |
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118 uint32_t* eaxp, |
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119 uint32_t* ebxp, |
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120 uint32_t* ecxp, |
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121 uint32_t* edxp) { |
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122 #ifdef _LP64 |
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123 __asm__ volatile (/* Instructions */ |
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124 " movl %4, %%eax \n" |
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125 " cpuid \n" |
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126 " movl %%eax, (%0)\n" |
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127 " movl %%ebx, (%1)\n" |
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128 " movl %%ecx, (%2)\n" |
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129 " movl %%edx, (%3)\n" |
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130 : /* Outputs */ |
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131 : /* Inputs */ |
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132 "r" (eaxp), |
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133 "r" (ebxp), |
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134 "r" (ecxp), |
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135 "r" (edxp), |
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136 "r" (arg) |
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137 : /* Clobbers */ |
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138 "%rax", "%rbx", "%rcx", "%rdx", "memory" |
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139 ); |
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140 #else /* _LP64 */ |
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141 uint32_t value_of_eax = 0; |
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142 uint32_t value_of_ebx = 0; |
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143 uint32_t value_of_ecx = 0; |
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144 uint32_t value_of_edx = 0; |
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145 __asm__ volatile (/* Instructions */ |
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146 /* ebx is callee-save, so push it */ |
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147 " pushl %%ebx \n" |
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148 " movl %4, %%eax \n" |
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149 " cpuid \n" |
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150 " movl %%eax, %0 \n" |
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151 " movl %%ebx, %1 \n" |
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152 " movl %%ecx, %2 \n" |
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153 " movl %%edx, %3 \n" |
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154 /* restore ebx */ |
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155 " popl %%ebx \n" |
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156 |
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157 : /* Outputs */ |
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158 "=m" (value_of_eax), |
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159 "=m" (value_of_ebx), |
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160 "=m" (value_of_ecx), |
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161 "=m" (value_of_edx) |
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162 : /* Inputs */ |
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163 "m" (arg) |
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164 : /* Clobbers */ |
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165 "%eax", "%ecx", "%edx" |
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166 ); |
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167 *eaxp = value_of_eax; |
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168 *ebxp = value_of_ebx; |
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169 *ecxp = value_of_ecx; |
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170 *edxp = value_of_edx; |
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171 #endif /* _LP64 */ |
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172 } |
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173 |
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174 /* The definition of a server-class machine for linux-i586 */ |
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175 jboolean |
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176 ServerClassMachineImpl(void) { |
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177 jboolean result = JNI_FALSE; |
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178 /* How big is a server class machine? */ |
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179 const unsigned long server_processors = 2UL; |
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180 const uint64_t server_memory = 2UL * GB; |
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181 /* |
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182 * We seem not to get our full complement of memory. |
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183 * We allow some part (1/8?) of the memory to be "missing", |
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184 * based on the sizes of DIMMs, and maybe graphics cards. |
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185 */ |
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186 const uint64_t missing_memory = 256UL * MB; |
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187 const uint64_t actual_memory = physical_memory(); |
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188 |
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189 /* Is this a server class machine? */ |
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190 if (actual_memory >= (server_memory - missing_memory)) { |
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191 const unsigned long actual_processors = physical_processors(); |
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192 if (actual_processors >= server_processors) { |
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193 result = JNI_TRUE; |
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194 } |
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195 } |
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196 JLI_TraceLauncher("linux_" LIBARCHNAME "_ServerClassMachine: %s\n", |
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197 (result == JNI_TRUE ? "true" : "false")); |
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198 return result; |
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199 } |
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200 #endif /* __linux__ */ |
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201 |
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202 /* |
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203 * Routines shared by solaris-i586 and linux-i586. |
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204 */ |
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205 |
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206 enum HyperThreadingSupport_enum { |
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207 hts_supported = 1, |
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208 hts_too_soon_to_tell = 0, |
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209 hts_not_supported = -1, |
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210 hts_not_pentium4 = -2, |
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211 hts_not_intel = -3 |
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212 }; |
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213 typedef enum HyperThreadingSupport_enum HyperThreadingSupport; |
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214 |
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215 /* Determine if hyperthreading is supported */ |
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216 static HyperThreadingSupport |
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217 hyperthreading_support(void) { |
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218 HyperThreadingSupport result = hts_too_soon_to_tell; |
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219 /* Bits 11 through 8 is family processor id */ |
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220 # define FAMILY_ID_SHIFT 8 |
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221 # define FAMILY_ID_MASK 0xf |
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222 /* Bits 23 through 20 is extended family processor id */ |
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223 # define EXT_FAMILY_ID_SHIFT 20 |
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224 # define EXT_FAMILY_ID_MASK 0xf |
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225 /* Pentium 4 family processor id */ |
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226 # define PENTIUM4_FAMILY_ID 0xf |
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227 /* Bit 28 indicates Hyper-Threading Technology support */ |
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228 # define HT_BIT_SHIFT 28 |
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229 # define HT_BIT_MASK 1 |
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230 uint32_t vendor_id[3] = { 0U, 0U, 0U }; |
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231 uint32_t value_of_eax = 0U; |
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232 uint32_t value_of_edx = 0U; |
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233 uint32_t dummy = 0U; |
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234 |
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235 /* Yes, this is supposed to be [0], [2], [1] */ |
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236 get_cpuid(0, &dummy, &vendor_id[0], &vendor_id[2], &vendor_id[1]); |
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237 JLI_TraceLauncher("vendor: %c %c %c %c %c %c %c %c %c %c %c %c \n", |
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238 ((vendor_id[0] >> 0) & 0xff), |
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239 ((vendor_id[0] >> 8) & 0xff), |
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240 ((vendor_id[0] >> 16) & 0xff), |
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241 ((vendor_id[0] >> 24) & 0xff), |
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242 ((vendor_id[1] >> 0) & 0xff), |
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243 ((vendor_id[1] >> 8) & 0xff), |
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244 ((vendor_id[1] >> 16) & 0xff), |
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245 ((vendor_id[1] >> 24) & 0xff), |
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246 ((vendor_id[2] >> 0) & 0xff), |
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247 ((vendor_id[2] >> 8) & 0xff), |
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248 ((vendor_id[2] >> 16) & 0xff), |
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249 ((vendor_id[2] >> 24) & 0xff)); |
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250 get_cpuid(1, &value_of_eax, &dummy, &dummy, &value_of_edx); |
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251 JLI_TraceLauncher("value_of_eax: 0x%x value_of_edx: 0x%x\n", |
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252 value_of_eax, value_of_edx); |
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253 if ((((value_of_eax >> FAMILY_ID_SHIFT) & FAMILY_ID_MASK) == PENTIUM4_FAMILY_ID) || |
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254 (((value_of_eax >> EXT_FAMILY_ID_SHIFT) & EXT_FAMILY_ID_MASK) != 0)) { |
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255 if ((((vendor_id[0] >> 0) & 0xff) == 'G') && |
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256 (((vendor_id[0] >> 8) & 0xff) == 'e') && |
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257 (((vendor_id[0] >> 16) & 0xff) == 'n') && |
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258 (((vendor_id[0] >> 24) & 0xff) == 'u') && |
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259 (((vendor_id[1] >> 0) & 0xff) == 'i') && |
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260 (((vendor_id[1] >> 8) & 0xff) == 'n') && |
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261 (((vendor_id[1] >> 16) & 0xff) == 'e') && |
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262 (((vendor_id[1] >> 24) & 0xff) == 'I') && |
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263 (((vendor_id[2] >> 0) & 0xff) == 'n') && |
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264 (((vendor_id[2] >> 8) & 0xff) == 't') && |
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265 (((vendor_id[2] >> 16) & 0xff) == 'e') && |
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266 (((vendor_id[2] >> 24) & 0xff) == 'l')) { |
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267 if (((value_of_edx >> HT_BIT_SHIFT) & HT_BIT_MASK) == HT_BIT_MASK) { |
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268 JLI_TraceLauncher("Hyperthreading supported\n"); |
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269 result = hts_supported; |
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270 } else { |
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271 JLI_TraceLauncher("Hyperthreading not supported\n"); |
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272 result = hts_not_supported; |
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273 } |
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274 } else { |
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275 JLI_TraceLauncher("Not GenuineIntel\n"); |
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276 result = hts_not_intel; |
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277 } |
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278 } else { |
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279 JLI_TraceLauncher("not Pentium 4 or extended\n"); |
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280 result = hts_not_pentium4; |
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281 } |
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282 return result; |
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283 } |
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284 |
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285 /* Determine how many logical processors there are per CPU */ |
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286 static unsigned int |
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287 logical_processors_per_package(void) { |
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288 /* |
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289 * After CPUID with EAX==1, register EBX bits 23 through 16 |
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290 * indicate the number of logical processors per package |
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291 */ |
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292 # define NUM_LOGICAL_SHIFT 16 |
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293 # define NUM_LOGICAL_MASK 0xff |
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294 unsigned int result = 1U; |
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295 const HyperThreadingSupport hyperthreading = hyperthreading_support(); |
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296 |
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297 if (hyperthreading == hts_supported) { |
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298 uint32_t value_of_ebx = 0U; |
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299 uint32_t dummy = 0U; |
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300 |
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301 get_cpuid(1, &dummy, &value_of_ebx, &dummy, &dummy); |
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302 result = (value_of_ebx >> NUM_LOGICAL_SHIFT) & NUM_LOGICAL_MASK; |
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303 JLI_TraceLauncher("logical processors per package: %u\n", result); |
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304 } |
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305 return result; |
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306 } |
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307 |
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308 /* Compute the number of physical processors, not logical processors */ |
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309 static unsigned long |
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310 physical_processors(void) { |
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311 const long sys_processors = sysconf(_SC_NPROCESSORS_CONF); |
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312 unsigned long result = sys_processors; |
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313 |
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314 JLI_TraceLauncher("sysconf(_SC_NPROCESSORS_CONF): %lu\n", sys_processors); |
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315 if (sys_processors > 1) { |
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316 unsigned int logical_processors = logical_processors_per_package(); |
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317 if (logical_processors > 1) { |
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318 result = (unsigned long) sys_processors / logical_processors; |
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319 } |
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320 } |
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321 JLI_TraceLauncher("physical processors: %lu\n", result); |
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322 return result; |
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323 } |
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