| b.liu | e958203 | 2025-04-17 19:18:16 +0800 | [diff] [blame^] | 1 | // SPDX-License-Identifier: GPL-2.0 |
| 2 | #include <math.h> |
| 3 | #include <unistd.h> |
| 4 | #include <stdio.h> |
| 5 | #include <stdlib.h> |
| 6 | #include <sys/types.h> |
| 7 | #include <sys/stat.h> |
| 8 | #include <fcntl.h> |
| 9 | #include <sys/timeb.h> |
| 10 | #include <sched.h> |
| 11 | #include <errno.h> |
| 12 | |
| 13 | |
| 14 | int main(int argc, char **argv) { |
| 15 | int cpu, fd; |
| 16 | long long msr; |
| 17 | char msr_file_name[64]; |
| 18 | |
| 19 | if (argc != 2) |
| 20 | return 1; |
| 21 | |
| 22 | errno = 0; |
| 23 | cpu = strtol(argv[1], (char **) NULL, 10); |
| 24 | |
| 25 | if (errno) |
| 26 | return 1; |
| 27 | |
| 28 | sprintf(msr_file_name, "/dev/cpu/%d/msr", cpu); |
| 29 | fd = open(msr_file_name, O_RDONLY); |
| 30 | |
| 31 | if (fd == -1) { |
| 32 | perror("Failed to open"); |
| 33 | return 1; |
| 34 | } |
| 35 | |
| 36 | pread(fd, &msr, sizeof(msr), 0x199); |
| 37 | |
| 38 | printf("msr 0x199: 0x%llx\n", msr); |
| 39 | return 0; |
| 40 | } |