com32/modules/cpuid.c

   1 /* ----------------------------------------------------------------------- *
   2  *
   3  *   Copyright 2010 Intel Corporation; author: H. Peter Anvin
   4  *
   5  *   This program is free software; you can redistribute it and/or modify
   6  *   it under the terms of the GNU General Public License as published by
   7  *   the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
   8  *   Boston MA 02110-1301, USA; either version 2 of the License, or
   9  *   (at your option) any later version; incorporated herein by reference.
  10  *
  11  * ----------------------------------------------------------------------- */
  12
  13 #include <stdio.h>
  14 #include <stdlib.h>
  15 #include <x86/cpu.h>
  16 #include <console.h>
  17 #include <com32.h>
  18
  19 static void dump_reg(const char *name, uint32_t val)
  20 {
  21     int i;
  22
  23     printf("%-3s : %10u 0x%08x ", name, val, val);
  24
  25     for (i = 3; i >= 0; i--) {
  26         uint8_t c = val >> (i*8);
  27         putchar((c >= ' ' && c <= '~') ? c : '.');
  28     }
  29     putchar('\n');
  30 }
  31
  32 int main(int argc, char *argv[])
  33 {
  34     uint32_t leaf, counter;
  35     uint32_t eax, ebx, ecx, edx;
  36
  37     if (argc < 2 || argc > 4) {
  38         printf("Usage: %s leaf [counter]\n", argv[0]);
  39         exit(1);
  40     }
  41
  42     leaf = strtoul(argv[1], NULL, 0);
  43     counter = (argc > 2) ? strtoul(argv[2], NULL, 0) : 0;
  44
  45     if (!cpu_has_eflag(EFLAGS_ID)) {
  46         printf("The CPUID instruction is not supported\n");
  47         exit(1);
  48     }
  49
  50     cpuid_count(leaf, counter, &eax, &ebx, &ecx, &edx);
  51
  52     dump_reg("eax", eax);
  53     dump_reg("ebx", ebx);
  54     dump_reg("ecx", ecx);
  55     dump_reg("edx", edx);
  56
  57     return 0;
  58 }