162306a36Sopenharmony_ci// SPDX-License-Identifier: GPL-2.0 262306a36Sopenharmony_ci#include <math.h> 362306a36Sopenharmony_ci#include <unistd.h> 462306a36Sopenharmony_ci#include <stdio.h> 562306a36Sopenharmony_ci#include <stdlib.h> 662306a36Sopenharmony_ci#include <sys/types.h> 762306a36Sopenharmony_ci#include <sys/stat.h> 862306a36Sopenharmony_ci#include <fcntl.h> 962306a36Sopenharmony_ci#include <sys/timeb.h> 1062306a36Sopenharmony_ci#include <sched.h> 1162306a36Sopenharmony_ci#include <errno.h> 1262306a36Sopenharmony_ci 1362306a36Sopenharmony_ci 1462306a36Sopenharmony_ciint main(int argc, char **argv) { 1562306a36Sopenharmony_ci int cpu, fd; 1662306a36Sopenharmony_ci long long msr; 1762306a36Sopenharmony_ci char msr_file_name[64]; 1862306a36Sopenharmony_ci 1962306a36Sopenharmony_ci if (argc != 2) 2062306a36Sopenharmony_ci return 1; 2162306a36Sopenharmony_ci 2262306a36Sopenharmony_ci errno = 0; 2362306a36Sopenharmony_ci cpu = strtol(argv[1], (char **) NULL, 10); 2462306a36Sopenharmony_ci 2562306a36Sopenharmony_ci if (errno) 2662306a36Sopenharmony_ci return 1; 2762306a36Sopenharmony_ci 2862306a36Sopenharmony_ci sprintf(msr_file_name, "/dev/cpu/%d/msr", cpu); 2962306a36Sopenharmony_ci fd = open(msr_file_name, O_RDONLY); 3062306a36Sopenharmony_ci 3162306a36Sopenharmony_ci if (fd == -1) { 3262306a36Sopenharmony_ci perror("Failed to open"); 3362306a36Sopenharmony_ci return 1; 3462306a36Sopenharmony_ci } 3562306a36Sopenharmony_ci 3662306a36Sopenharmony_ci pread(fd, &msr, sizeof(msr), 0x199); 3762306a36Sopenharmony_ci 3862306a36Sopenharmony_ci printf("msr 0x199: 0x%llx\n", msr); 3962306a36Sopenharmony_ci return 0; 4062306a36Sopenharmony_ci} 41