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5
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1 /*
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2 * SpanDSP - a series of DSP components for telephony
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3 *
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4 * testcpuid.c - Check the CPU type, to identify special features, like SSE.
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5 *
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6 * Written by Steve Underwood <steveu@coppice.org>
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7 * Stitched together from bits of testing code found here and there
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8 *
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9 * Copyright (C) 2004 Steve Underwood
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10 *
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11 * All rights reserved.
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12 *
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13 * This program is free software; you can redistribute it and/or modify
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14 * it under the terms of the GNU General Public License version 2, as
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15 * published by the Free Software Foundation.
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16 *
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17 * This program is distributed in the hope that it will be useful,
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18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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20 * GNU General Public License for more details.
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21 *
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22 * You should have received a copy of the GNU General Public License
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23 * along with this program; if not, write to the Free Software
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24 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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25 *
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26 * $Id: testcpuid.c,v 1.9 2006/10/24 13:45:27 steveu Exp $
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27 */
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28
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29 /*! \file */
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30
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31 #ifdef HAVE_CONFIG_H
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32 #include <config.h>
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33 #endif
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34
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35 #include <inttypes.h>
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36
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37 /* Make this file just disappear if we are not on an x86 machine */
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38 #if defined(__i386__) // || defined(__x86_64__)
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39
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40 #define X86_EFLAGS_CF 0x00000001 /* Carry Flag */
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41 #define X86_EFLAGS_PF 0x00000004 /* Parity Flag */
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42 #define X86_EFLAGS_AF 0x00000010 /* Auxillary carry Flag */
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43 #define X86_EFLAGS_ZF 0x00000040 /* Zero Flag */
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44 #define X86_EFLAGS_SF 0x00000080 /* Sign Flag */
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45 #define X86_EFLAGS_TF 0x00000100 /* Trap Flag */
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46 #define X86_EFLAGS_IF 0x00000200 /* Interrupt Flag */
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47 #define X86_EFLAGS_DF 0x00000400 /* Direction Flag */
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48 #define X86_EFLAGS_OF 0x00000800 /* Overflow Flag */
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49 #define X86_EFLAGS_IOPL 0x00003000 /* IOPL mask */
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50 #define X86_EFLAGS_NT 0x00004000 /* Nested Task */
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51 #define X86_EFLAGS_RF 0x00010000 /* Resume Flag */
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52 #define X86_EFLAGS_VM 0x00020000 /* Virtual Mode */
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53 #define X86_EFLAGS_AC 0x00040000 /* Alignment Check */
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54 #define X86_EFLAGS_VIF 0x00080000 /* Virtual Interrupt Flag */
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55 #define X86_EFLAGS_VIP 0x00100000 /* Virtual Interrupt Pending */
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56 #define X86_EFLAGS_ID 0x00200000 /* CPUID detection flag */
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57
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58 /* Standard macro to see if a specific flag is changeable */
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59 static __inline__ int flag_is_changeable_p(uint32_t flag)
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60 {
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61 uint32_t f1;
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62 uint32_t f2;
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63
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64 __asm__ __volatile__ (
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65 " pushfl\n"
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66 " pushfl\n"
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67 " popl %0\n"
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68 " movl %0,%1\n"
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69 " xorl %2,%0\n"
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70 " pushl %0\n"
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71 " popfl\n"
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72 " pushfl\n"
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73 " popl %0\n"
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74 " popfl\n"
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75 : "=&r" (f1), "=&r" (f2)
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76 : "ir" (flag));
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77
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78 return ((f1^f2) & flag) != 0;
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79 }
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80 /*- End of function --------------------------------------------------------*/
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81
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82 /* Probe for the CPUID instruction */
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83 static int have_cpuid_p(void)
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84 {
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85 return flag_is_changeable_p(X86_EFLAGS_ID);
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86 }
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87 /*- End of function --------------------------------------------------------*/
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88
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89 int has_MMX(void)
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90 {
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91 int result;
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92
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93 if (!have_cpuid_p())
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94 return 0;
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95 /*endif*/
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96 __asm__ __volatile__ (
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97 " push %%ebx;\n"
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98 " mov $1,%%eax;\n"
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99 " cpuid;\n"
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100 " xor %%eax,%%eax;\n"
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101 " test $0x800000,%%edx;\n"
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102 " jz 1f;\n" /* no MMX support */
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103 " inc %%eax;\n" /* MMX support */
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104 "1:\n"
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105 " pop %%ebx;\n"
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106 : "=a" (result)
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107 :
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108 : "ecx", "edx");
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109 return result;
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110 }
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111 /*- End of function --------------------------------------------------------*/
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112
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113 int has_SIMD(void)
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114 {
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115 int result;
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116
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117 if (!have_cpuid_p())
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118 return 0;
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119 /*endif*/
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120 __asm__ __volatile__ (
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121 " push %%ebx;\n"
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122 " mov $1,%%eax;\n"
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123 " cpuid;\n"
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124 " xor %%eax,%%eax;\n"
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125 " test $0x02000000,%%edx;\n"
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126 " jz 1f;\n" /* no SIMD support */
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127 " inc %%eax;\n" /* SIMD support */
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128 "1:\n"
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129 " pop %%ebx;\n"
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130 : "=a" (result)
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131 :
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132 : "ecx", "edx");
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133 return result;
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134 }
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135 /*- End of function --------------------------------------------------------*/
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136
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137 int has_SIMD2(void)
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138 {
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139 int result;
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140
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141 if (!have_cpuid_p())
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142 return 0;
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143 /*endif*/
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144 __asm__ __volatile__ (
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145 " push %%ebx;\n"
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146 " mov $1,%%eax;\n"
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147 " cpuid;\n"
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148 " xor %%eax,%%eax;\n"
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149 " test $0x04000000,%%edx;\n"
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150 " jz 1f;\n" /* no SIMD2 support */
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151 " inc %%eax;\n" /* SIMD2 support */
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152 "1:\n"
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153 " pop %%ebx;\n"
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154 : "=a" (result)
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155 :
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156 : "ecx", "edx");
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157 return result;
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158 }
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159 /*- End of function --------------------------------------------------------*/
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160
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161 int has_3DNow(void)
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162 {
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163 int result;
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164
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165 if (!have_cpuid_p())
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166 return 0;
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167 /*endif*/
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168 __asm__ __volatile__ (
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169 " push %%ebx;\n"
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170 " mov $0x80000000,%%eax;\n"
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171 " cpuid;\n"
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172 " xor %%ecx,%%ecx;\n"
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173 " cmp $0x80000000,%%eax;\n"
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174 " jbe 1f;\n" /* no extended MSR(1), so no 3DNow! */
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175 " mov $0x80000001,%%eax;\n"
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176 " cpuid;\n"
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177 " xor %%ecx,%%ecx;\n"
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178 " test $0x80000000,%%edx;\n"
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179 " jz 1f;\n" /* no 3DNow! support */
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180 " inc %%ecx;\n" /* 3DNow! support */
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181 "1:\n"
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182 " pop %%ebx;\n"
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183 : "=c" (result)
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184 :
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185 : "eax", "edx");
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186 return result;
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187 }
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188 /*- End of function --------------------------------------------------------*/
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189
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190 #if defined(TESTBED)
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191 int main(int argc, char *argv[])
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192 {
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193 int result;
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194
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195 result = has_MMX();
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196 printf("MMX is %x\n", result);
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197 result = has_SIMD();
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198 printf("SIMD is %x\n", result);
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199 result = has_SIMD2();
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200 printf("SIMD2 is %x\n", result);
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201 result = has_3DNow();
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202 printf("3DNow is %x\n", result);
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203 return 0;
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204 }
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205 /*- End of function --------------------------------------------------------*/
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206 #endif
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207
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208 #endif
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209 /*- End of file ------------------------------------------------------------*/
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