LXR linux/tools/power/cpupower/debug/i386/intel

   1/*
   2 *  (C) 2003  Bruno Ducrot
   3 *  (C) 2004  Dominik Brodowski <linux@dominikbrodowski.de>
   4 *
   5 *  Licensed under the terms of the GNU GPL License version 2.
   6 *
   7 * Based on code found in
   8 * linux/include/asm-i386/ist.h and linux/arch/i386/kernel/setup.c
   9 * and originally developed by Andy Grover <andrew.grover@intel.com>
  10 */
  11
  12#include <stdio.h>
  13#include <string.h>
  14#include <lrmi.h>
  15
  16int main (void)
  17{
  18        struct LRMI_regs        r;
  19        int                     retval;
  20
  21        if (!LRMI_init())
  22                return 0;
  23
  24        memset(&r, 0, sizeof(r));
  25
  26        r.eax = 0x0000E980;
  27        r.edx = 0x47534943;
  28
  29        retval = LRMI_int(0x15, &r);
  30
  31        if (!retval) {
  32                printf("Failed!\n");
  33                return 0;
  34        }
  35        if (r.eax == 0x47534943) {
  36                printf("BIOS supports GSIC call:\n");
  37                printf("\tsignature: %c%c%c%c\n",
  38                       (r.eax >> 24) & 0xff,
  39                       (r.eax >> 16) & 0xff,
  40                       (r.eax >> 8) & 0xff,
  41                       (r.eax) & 0xff);
  42                printf("\tcommand port = 0x%.4x\n",
  43                       r.ebx & 0xffff);
  44                printf("\tcommand =      0x%.4x\n",
  45                       (r.ebx >> 16) & 0xffff);
  46                printf("\tevent port =   0x%.8x\n", r.ecx);
  47                printf("\tflags =        0x%.8x\n", r.edx);
  48                if (((r.ebx >> 16) & 0xffff) != 0x82) {
  49                        printf("non-default command value. If speedstep-smi "
  50                               "doesn't work out of the box,\nyou may want to "
  51                               "try out the default value by passing "
  52                               "smi_cmd=0x82 to the module\n ON YOUR OWN "
  53                               "RISK.\n");
  54                }
  55                if ((r.ebx & 0xffff) != 0xb2) {
  56                        printf("non-default command port. If speedstep-smi "
  57                               "doesn't work out of the box,\nyou may want to "
  58                               "try out the default value by passing "
  59                               "smi_port=0x82 to the module\n ON YOUR OWN "
  60                               "RISK.\n");
  61                }
  62        } else {
  63                printf("BIOS DOES NOT support GSIC call.  Dumping registers anyway:\n");
  64                printf("eax = 0x%.8x\n", r.eax);
  65                printf("ebx = 0x%.8x\n", r.ebx);
  66                printf("ecx = 0x%.8x\n", r.ecx);
  67                printf("edx = 0x%.8x\n", r.edx);
  68                printf("Note also that some BIOS do not support the initial "
  69                       "GSIC call, but the newer\nspeedstep-smi driver may "
  70                       "work.\nFor this, you need to pass some arguments to "
  71                       "the speedstep-smi driver:\n");
  72                printf("\tsmi_cmd=0x?? smi_port=0x?? smi_sig=1\n");
  73                printf("\nUnfortunately, you have to know what exactly are "
  74                       "smi_cmd and smi_port, and this\nis system "
  75                       "dependant.\n");
  76        }
  77        return 1;
  78}
  79