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

   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 *  (C) 2003  Bruno Ducrot
   4 *  (C) 2004  Dominik Brodowski <linux@dominikbrodowski.de>
   5 *
   6 * Based on code found in
   7 * linux/include/asm-i386/ist.h and linux/arch/i386/kernel/setup.c
   8 * and originally developed by Andy Grover <andrew.grover@intel.com>
   9 */
  10
  11#include <stdio.h>
  12#include <string.h>
  13#include <lrmi.h>
  14
  15int main (void)
  16{
  17        struct LRMI_regs        r;
  18        int                     retval;
  19
  20        if (!LRMI_init())
  21                return 0;
  22
  23        memset(&r, 0, sizeof(r));
  24
  25        r.eax = 0x0000E980;
  26        r.edx = 0x47534943;
  27
  28        retval = LRMI_int(0x15, &r);
  29
  30        if (!retval) {
  31                printf("Failed!\n");
  32                return 0;
  33        }
  34        if (r.eax == 0x47534943) {
  35                printf("BIOS supports GSIC call:\n");
  36                printf("\tsignature: %c%c%c%c\n",
  37                       (r.eax >> 24) & 0xff,
  38                       (r.eax >> 16) & 0xff,
  39                       (r.eax >> 8) & 0xff,
  40                       (r.eax) & 0xff);
  41                printf("\tcommand port = 0x%.4x\n",
  42                       r.ebx & 0xffff);
  43                printf("\tcommand =      0x%.4x\n",
  44                       (r.ebx >> 16) & 0xffff);
  45                printf("\tevent port =   0x%.8x\n", r.ecx);
  46                printf("\tflags =        0x%.8x\n", r.edx);
  47                if (((r.ebx >> 16) & 0xffff) != 0x82) {
  48                        printf("non-default command value. If speedstep-smi "
  49                               "doesn't work out of the box,\nyou may want to "
  50                               "try out the default value by passing "
  51                               "smi_cmd=0x82 to the module\n ON YOUR OWN "
  52                               "RISK.\n");
  53                }
  54                if ((r.ebx & 0xffff) != 0xb2) {
  55                        printf("non-default command port. If speedstep-smi "
  56                               "doesn't work out of the box,\nyou may want to "
  57                               "try out the default value by passing "
  58                               "smi_port=0x82 to the module\n ON YOUR OWN "
  59                               "RISK.\n");
  60                }
  61        } else {
  62                printf("BIOS DOES NOT support GSIC call.  Dumping registers anyway:\n");
  63                printf("eax = 0x%.8x\n", r.eax);
  64                printf("ebx = 0x%.8x\n", r.ebx);
  65                printf("ecx = 0x%.8x\n", r.ecx);
  66                printf("edx = 0x%.8x\n", r.edx);
  67                printf("Note also that some BIOS do not support the initial "
  68                       "GSIC call, but the newer\nspeedstep-smi driver may "
  69                       "work.\nFor this, you need to pass some arguments to "
  70                       "the speedstep-smi driver:\n");
  71                printf("\tsmi_cmd=0x?? smi_port=0x?? smi_sig=1\n");
  72                printf("\nUnfortunately, you have to know what exactly are "
  73                       "smi_cmd and smi_port, and this\nis system "
  74                       "dependent.\n");
  75        }
  76        return 1;
  77}
  78