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Linux/tools/testing/selftests/intel_pstate/msr.c

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  1 #include <math.h>
  2 #include <unistd.h>
  3 #include <stdio.h>
  4 #include <stdlib.h>
  5 #include <sys/types.h>
  6 #include <sys/stat.h>
  7 #include <fcntl.h>
  8 #include <sys/timeb.h>
  9 #include <sched.h>
 10 #include <errno.h>
 11 
 12 
 13 int main(int argc, char **argv) {
 14         int cpu, fd;
 15         long long msr;
 16         char msr_file_name[64];
 17 
 18         if (argc != 2)
 19                 return 1;
 20 
 21         errno = 0;
 22         cpu = strtol(argv[1], (char **) NULL, 10);
 23 
 24         if (errno)
 25                 return 1;
 26 
 27         sprintf(msr_file_name, "/dev/cpu/%d/msr", cpu);
 28         fd = open(msr_file_name, O_RDONLY);
 29 
 30         if (fd == -1) {
 31                 perror("Failed to open");
 32                 return 1;
 33         }
 34 
 35         pread(fd, &msr,  sizeof(msr), 0x199);
 36 
 37         printf("msr 0x199: 0x%llx\n", msr);
 38         return 0;
 39 }
 40 

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