40 lines
643 B
C
40 lines
643 B
C
#include <math.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <sys/timeb.h>
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#include <sched.h>
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#include <errno.h>
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int main(int argc, char **argv) {
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int cpu, fd;
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long long msr;
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char msr_file_name[64];
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if (argc != 2)
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return 1;
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errno = 0;
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cpu = strtol(argv[1], (char **) NULL, 10);
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if (errno)
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return 1;
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sprintf(msr_file_name, "/dev/cpu/%d/msr", cpu);
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fd = open(msr_file_name, O_RDONLY);
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if (fd == -1) {
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perror("Failed to open");
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return 1;
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}
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pread(fd, &msr, sizeof(msr), 0x199);
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printf("msr 0x199: 0x%llx\n", msr);
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return 0;
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}
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