summaryrefslogtreecommitdiffstats
path: root/cpuinfo.c
blob: 660ccd3fb454d99228a959b239344b78abf1253c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
/* small utility to extract CPU information
   Used by configure to set CPU optimization levels on some operating
   systems where /proc/cpuinfo is non-existent or unreliable. */

#include <stdio.h>
#include <sys/time.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#ifdef __MINGW32__
#define MISSING_USLEEP
#include <windows.h>
#define sleep(t) Sleep(1000*t);
#endif

#ifdef __BEOS__
#define usleep(t) snooze(t)
#endif

#ifdef M_UNIX
typedef long long int64_t;
#define MISSING_USLEEP
#else
#include <inttypes.h>
#endif

#define CPUID_FEATURE_DEF(bit, desc, description) \
  { bit, desc }

typedef struct cpuid_regs {
  unsigned int eax;
  unsigned int ebx;
  unsigned int ecx;
  unsigned int edx;
} cpuid_regs_t;

static cpuid_regs_t
cpuid(int func) {
  cpuid_regs_t regs;
#define CPUID   ".byte 0x0f, 0xa2; "
#ifdef __x86_64__
  __asm__("mov %%rbx, %%rsi\n\t"
#else
  __asm__("mov %%ebx, %%esi\n\t"
#endif
      CPUID"\n\t"
#ifdef __x86_64__
      "xchg %%rsi, %%rbx\n\t"
#else
      "xchg %%esi, %%ebx\n\t"
#endif
      : "=a" (regs.eax), "=S" (regs.ebx), "=c" (regs.ecx), "=d" (regs.edx)
      : "0" (func));
  return regs;
}


static int64_t
rdtsc(void)
{
  uint64_t i;
#define RDTSC   ".byte 0x0f, 0x31; "
  __asm__ volatile (RDTSC : "=A"(i) : );
  return i;
}

static const char*
brandname(int i)
{
  static const char* brandmap[] = {
    NULL,
    "Intel(R) Celeron(R) processor",
    "Intel(R) Pentium(R) III processor",
    "Intel(R) Pentium(R) III Xeon(tm) processor",
    "Intel(R) Pentium(R) III processor",
    NULL,
    "Mobile Intel(R) Pentium(R) III processor-M",
    "Mobile Intel(R) Celeron(R) processor"
  };

  if (i >= sizeof(brandmap))
    return NULL;
  else
    return brandmap[i];
}

static void
store32(char *d, unsigned int v)
{
  d[0] =  v        & 0xff;
  d[1] = (v >>  8) & 0xff;
  d[2] = (v >> 16) & 0xff;
  d[3] = (v >> 24) & 0xff;
}


int
main(void)
{
  cpuid_regs_t regs, regs_ext;
  char idstr[13];
  unsigned max_cpuid;
  unsigned max_ext_cpuid;
  unsigned int amd_flags;
  unsigned int amd_flags2;
  const char *model_name = NULL;
  int i;
  char processor_name[49];

  regs = cpuid(0);
  max_cpuid = regs.eax;
  /* printf("%d CPUID function codes\n", max_cpuid+1); */

  store32(idstr+0, regs.ebx);
  store32(idstr+4, regs.edx);
  store32(idstr+8, regs.ecx);
  idstr[12] = 0;
  printf("vendor_id\t: %s\n", idstr);

  regs_ext = cpuid((1<<31) + 0);
  max_ext_cpuid = regs_ext.eax;
  if (max_ext_cpuid >= (1<<31) + 1) {
    regs_ext = cpuid((1<<31) + 1);
    amd_flags = regs_ext.edx;
    amd_flags2 = regs_ext.ecx;

    if (max_ext_cpuid >= (1<<31) + 4) {
      for (i = 2; i <= 4; i++) {
        regs_ext = cpuid((1<<31) + i);
        store32(processor_name + (i-2)*16, regs_ext.eax);
        store32(processor_name + (i-2)*16 + 4, regs_ext.ebx);
        store32(processor_name + (i-2)*16 + 8, regs_ext.ecx);
        store32(processor_name + (i-2)*16 + 12, regs_ext.edx);
      }
      processor_name[48] = 0;
      model_name = processor_name;
      while (*model_name == ' ') {
        model_name++;
      }
    }
  } else {
    amd_flags = 0;
    amd_flags2 = 0;
  }

  if (max_cpuid >= 1) {
    static struct {
      int bit;
      char *desc;
    } cap[] = {
      CPUID_FEATURE_DEF(0, "fpu", "Floating-point unit on-chip"),
      CPUID_FEATURE_DEF(1, "vme", "Virtual Mode Enhancements"),
      CPUID_FEATURE_DEF(2, "de", "Debugging Extension"),
      CPUID_FEATURE_DEF(3, "pse", "Page Size Extension"),
      CPUID_FEATURE_DEF(4, "tsc", "Time Stamp Counter"),
      CPUID_FEATURE_DEF(5, "msr", "Pentium Processor MSR"),
      CPUID_FEATURE_DEF(6, "pae", "Physical Address Extension"),
      CPUID_FEATURE_DEF(7, "mce", "Machine Check Exception"),
      CPUID_FEATURE_DEF(8, "cx8", "CMPXCHG8B Instruction Supported"),
      CPUID_FEATURE_DEF(9, "apic", "On-chip APIC Hardware Enabled"),
      CPUID_FEATURE_DEF(11, "sep", "SYSENTER and SYSEXIT"),
      CPUID_FEATURE_DEF(12, "mtrr", "Memory Type Range Registers"),
      CPUID_FEATURE_DEF(13, "pge", "PTE Global Bit"),
      CPUID_FEATURE_DEF(14, "mca", "Machine Check Architecture"),
      CPUID_FEATURE_DEF(15, "cmov", "Conditional Move/Compare Instruction"),
      CPUID_FEATURE_DEF(16, "pat", "Page Attribute Table"),
      CPUID_FEATURE_DEF(17, "pse36", "Page Size Extension 36-bit"),
      CPUID_FEATURE_DEF(18, "pn", "Processor Serial Number"),
      CPUID_FEATURE_DEF(19, "clflush", "CFLUSH instruction"),
      CPUID_FEATURE_DEF(21, "dts", "Debug Store"),
      CPUID_FEATURE_DEF(22, "acpi", "Thermal Monitor and Clock Ctrl"),
      CPUID_FEATURE_DEF(23, "mmx", "MMX Technology"),
      CPUID_FEATURE_DEF(24, "fxsr", "FXSAVE/FXRSTOR"),
      CPUID_FEATURE_DEF(25, "sse", "SSE Extensions"),
      CPUID_FEATURE_DEF(26, "sse2", "SSE2 Extensions"),
      CPUID_FEATURE_DEF(27, "ss", "Self Snoop"),
      CPUID_FEATURE_DEF(28, "ht", "Multi-threading"),
      CPUID_FEATURE_DEF(29, "tm", "Therm. Monitor"),
      CPUID_FEATURE_DEF(30, "ia64", "IA-64 Processor"),
      CPUID_FEATURE_DEF(31, "pbe", "Pend. Brk. EN."),
      { -1 }
    };
    static struct {
      int bit;
      char *desc;
    } cap2[] = {
      CPUID_FEATURE_DEF(0, "pni", "SSE3 Extensions"),
      CPUID_FEATURE_DEF(1, "pclmulqdq", "Carryless Multiplication"),
      CPUID_FEATURE_DEF(2, "dtes64", "64-bit Debug Store"),
      CPUID_FEATURE_DEF(3, "monitor", "MONITOR/MWAIT"),
      CPUID_FEATURE_DEF(4, "ds_cpl", "CPL Qualified Debug Store"),
      CPUID_FEATURE_DEF(5, "vmx", "Virtual Machine Extensions"),
      CPUID_FEATURE_DEF(6, "smx", "Safer Mode Extensions"),
      CPUID_FEATURE_DEF(7, "est", "Enhanced Intel SpeedStep Technology"),
      CPUID_FEATURE_DEF(8, "tm2", "Thermal Monitor 2"),
      CPUID_FEATURE_DEF(9, "ssse3", "Supplemental SSE3"),
      CPUID_FEATURE_DEF(10, "cid", "L1 Context ID"),
      CPUID_FEATURE_DEF(12, "fma", "Fused Multiply Add"),
      CPUID_FEATURE_DEF(13, "cx16", "CMPXCHG16B Available"),
      CPUID_FEATURE_DEF(14, "xtpr", "xTPR Disable"),
      CPUID_FEATURE_DEF(15, "pdcm", "Perf/Debug Capability MSR"),
      CPUID_FEATURE_DEF(18, "dca", "Direct Cache Access"),
      CPUID_FEATURE_DEF(19, "sse4_1", "SSE4.1 Extensions"),
      CPUID_FEATURE_DEF(20, "sse4_2", "SSE4.2 Extensions"),
      CPUID_FEATURE_DEF(21, "x2apic", "x2APIC Feature"),
      CPUID_FEATURE_DEF(22, "movbe", "MOVBE Instruction"),
      CPUID_FEATURE_DEF(23, "popcnt", "Pop Count Instruction"),
      CPUID_FEATURE_DEF(25, "aes", "AES Instruction"),
      CPUID_FEATURE_DEF(26, "xsave", "XSAVE/XRSTOR Extensions"),
      CPUID_FEATURE_DEF(27, "osxsave", "XSAVE/XRSTOR Enabled in the OS"),
      CPUID_FEATURE_DEF(28, "avx", "Advanced Vector Extension"),
      { -1 }
    };
    static struct {
      int bit;
      char *desc;
    } cap_amd[] = {
      CPUID_FEATURE_DEF(11, "syscall", "SYSCALL and SYSRET"),
      CPUID_FEATURE_DEF(19, "mp", "MP Capable"),
      CPUID_FEATURE_DEF(20, "nx", "No-Execute Page Protection"),
      CPUID_FEATURE_DEF(22, "mmxext", "MMX Technology (AMD Extensions)"),
      CPUID_FEATURE_DEF(25, "fxsr_opt", "Fast FXSAVE/FXRSTOR"),
      CPUID_FEATURE_DEF(26, "pdpe1gb", "PDP Entry for 1GiB Page"),
      CPUID_FEATURE_DEF(27, "rdtscp", "RDTSCP Instruction"),
      CPUID_FEATURE_DEF(29, "lm", "Long Mode Capable"),
      CPUID_FEATURE_DEF(30, "3dnowext", "3DNow! Extensions"),
      CPUID_FEATURE_DEF(31, "3dnow", "3DNow!"),
      { -1 }
    };
    static struct {
      int bit;
      char *desc;
    } cap_amd2[] = {
      CPUID_FEATURE_DEF(0, "lahf_lm", "LAHF/SAHF Supported in 64-bit Mode"),
      CPUID_FEATURE_DEF(1, "cmp_legacy", "Chip Multi-Core"),
      CPUID_FEATURE_DEF(2, "svm", "Secure Virtual Machine"),
      CPUID_FEATURE_DEF(3, "extapic", "Extended APIC Space"),
      CPUID_FEATURE_DEF(4, "cr8_legacy", "CR8 Available in Legacy Mode"),
      CPUID_FEATURE_DEF(5, "abm", "Advanced Bit Manipulation"),
      CPUID_FEATURE_DEF(6, "sse4a", "SSE4A Extensions"),
      CPUID_FEATURE_DEF(7, "misalignsse", "Misaligned SSE Mode"),
      CPUID_FEATURE_DEF(8, "3dnowprefetch", "3DNow! Prefetch/PrefetchW"),
      CPUID_FEATURE_DEF(9, "osvw", "OS Visible Workaround"),
      CPUID_FEATURE_DEF(10, "ibs", "Instruction Based Sampling"),
      CPUID_FEATURE_DEF(11, "sse5", "SSE5 Extensions"),
      CPUID_FEATURE_DEF(12, "skinit", "SKINIT, STGI, and DEV Support"),
      CPUID_FEATURE_DEF(13, "wdt", "Watchdog Timer Support"),
      { -1 }
    };
    unsigned int family, model, stepping;

    regs = cpuid(1);
    family = (regs.eax >> 8) & 0xf;
    model = (regs.eax >> 4) & 0xf;
    stepping = regs.eax & 0xf;

    if (family == 0xf)
      family += (regs.eax >> 20) & 0xff;
    if (family == 0xf || family == 6)
      model += ((regs.eax >> 16) & 0xf) << 4;

    printf("cpu family\t: %d\n"
           "model\t\t: %d\n"
           "stepping\t: %d\n" ,
           family,
           model,
           stepping);

    if (strstr(idstr, "Intel") && !model_name) {
      if (family == 6 && model == 0xb && stepping == 1)
        model_name = "Intel (R) Celeron (R) processor";
      else
        model_name = brandname(regs.ebx & 0xf);
    }

    printf("flags\t\t:");
    for (i = 0; cap[i].bit >= 0; i++) {
      if (regs.edx & (1 << cap[i].bit)) {
        printf(" %s", cap[i].desc);
      }
    }
    for (i = 0; cap2[i].bit >= 0; i++) {
      if (regs.ecx & (1 << cap2[i].bit)) {
        printf(" %s", cap2[i].desc);
      }
    }
    /* k6_mtrr is supported by some AMD K6-2/K6-III CPUs but
       it is not indicated by a CPUID feature bit, so we
       have to check the family, model and stepping instead. */
    if (strstr(idstr, "AMD") &&
        family == 5 &&
        (model >= 9 || (model == 8 && stepping >= 8)))
      printf(" %s", "k6_mtrr");
    /* similar for cyrix_arr. */
    if (strstr(idstr, "Cyrix") &&
        (family == 5 && (model < 4 || family == 6)))
      printf(" %s", "cyrix_arr");
    /* as well as centaur_mcr. */
    if (strstr(idstr, "Centaur") &&
        family == 5)
      printf(" %s", "centaur_mcr");

    for (i = 0; cap_amd[i].bit >= 0; i++) {
      if (amd_flags & (1 << cap_amd[i].bit)) {
        printf(" %s", cap_amd[i].desc);
      }
    }
    for (i = 0; cap_amd2[i].bit >= 0; i++) {
      if (amd_flags2 & (1 << cap_amd2[i].bit)) {
        printf(" %s", cap_amd2[i].desc);
      }
    }
    printf("\n");

    if (regs.edx & (1 << 4)) {
      int64_t tsc_start, tsc_end;
      struct timeval tv_start, tv_end;
      int usec_delay;

      tsc_start = rdtsc();
      gettimeofday(&tv_start, NULL);
#ifdef  MISSING_USLEEP
      sleep(1);
#else
      usleep(100000);
#endif
      tsc_end = rdtsc();
      gettimeofday(&tv_end, NULL);

      usec_delay = 1000000 * (tv_end.tv_sec - tv_start.tv_sec)
        + (tv_end.tv_usec - tv_start.tv_usec);

      printf("cpu MHz\t\t: %.3f\n",
             (double)(tsc_end-tsc_start) / usec_delay);
    }
  }

  printf("model name\t: ");
  if (model_name)
    printf("%s\n", model_name);
  else
    printf("Unknown %s CPU\n", idstr);
}