1 /*
   2  * This file and its contents are supplied under the terms of the
   3  * Common Development and Distribution License ("CDDL"), version 1.0.
   4  * You may only use this file in accordance with the terms of version
   5  * 1.0 of the CDDL.
   6  *
   7  * A full copy of the text of the CDDL should have accompanied this
   8  * source.  A copy of the CDDL is also available via the Internet at
   9  * http://www.illumos.org/license/CDDL.
  10  */
  11 
  12 /*
  13  * Copyright 2019 Joyent, Inc.
  14  */
  15 
  16 #include <sys/cpuid_drv.h>
  17 
  18 #include <libintl.h>
  19 #include <string.h>
  20 #include <locale.h>
  21 #include <unistd.h>
  22 #include <stdlib.h>
  23 #include <fcntl.h>
  24 #include <stdio.h>
  25 #include <errno.h>
  26 #include <err.h>
  27 
  28 static const char dev_cpu_self_cpuid[] = "/dev/" CPUID_SELF_NAME;
  29 
  30 int
  31 main(int argc, char *argv[])
  32 {
  33         int ret = EXIT_SUCCESS;
  34         int errflg = 0;
  35         int fd;
  36         int c;
  37 
  38         (void) setlocale(LC_ALL, "");
  39         (void) textdomain(TEXT_DOMAIN);
  40 
  41         while ((c = getopt(argc, argv, "")) != EOF) {
  42                 switch (c) {
  43                 case '?':
  44                 default:
  45                         errflg++;
  46                         break;
  47                 }
  48         }
  49 
  50         if (errflg != 0 || optind == argc) {
  51                 fprintf(stderr, gettext("usage: rdmsr [0x<msrnr>...]\n"));
  52                 return (EXIT_FAILURE);
  53         }
  54 
  55         if ((fd = open(dev_cpu_self_cpuid, O_RDONLY)) == -1) {
  56                 err(EXIT_FAILURE, gettext("failed to open %s"),
  57                     dev_cpu_self_cpuid);
  58         }
  59 
  60         while (optind != argc) {
  61                 struct cpuid_rdmsr crm;
  62                 char *p;
  63 
  64                 errno = 0;
  65                 crm.cr_msr_nr = strtoull(argv[optind], &p, 0);
  66 
  67                 if (errno != 0 || p == argv[optind] || *p != '\0') {
  68                         fprintf(stderr,
  69                             gettext("rdmsr: invalid argument '%s'\n"),
  70                             argv[optind]);
  71                         exit(EXIT_FAILURE);
  72                 }
  73 
  74                 if (ioctl(fd, CPUID_RDMSR, &crm) != 0) {
  75                         warn(gettext("rdmsr of 0x%lx failed"), crm.cr_msr_nr);
  76                         ret = EXIT_FAILURE;
  77                 } else {
  78                         printf("0x%lx: 0x%lx\n", crm.cr_msr_nr, crm.cr_msr_val);
  79                 }
  80 
  81                 optind++;
  82         }
  83 
  84         return (ret);
  85 }