Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0
#include <math.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/timeb.h>
#include <sched.h>
#include <errno.h>
#include <string.h>
#include "../kselftest.h"
 
void usage(char *name) {
<------>printf ("Usage: %s cpunum\n", name);
}
 
int main(int argc, char **argv) {
<------>unsigned int i, cpu, fd;
<------>char msr_file_name[64];
<------>long long tsc, old_tsc, new_tsc;
<------>long long aperf, old_aperf, new_aperf;
<------>long long mperf, old_mperf, new_mperf;
<------>struct timeb before, after;
<------>long long int start, finish, total;
<------>cpu_set_t cpuset;
 
<------>if (argc != 2) {
<------><------>usage(argv[0]);
<------><------>return 1;
<------>}
 
<------>errno = 0;
<------>cpu = strtol(argv[1], (char **) NULL, 10);
 
<------>if (errno) {
<------><------>usage(argv[0]);
<------><------>return 1;
<------>}
 
<------>sprintf(msr_file_name, "/dev/cpu/%d/msr", cpu);
<------>fd = open(msr_file_name, O_RDONLY);
 
<------>if (fd == -1) {
<------><------>printf("/dev/cpu/%d/msr: %s\n", cpu, strerror(errno));
<------><------>return KSFT_SKIP;
<------>}
 
<------>CPU_ZERO(&cpuset);
<------>CPU_SET(cpu, &cpuset);
 
<------>if (sched_setaffinity(0, sizeof(cpu_set_t), &cpuset)) {
<------><------>perror("Failed to set cpu affinity");
<------><------>return 1;
<------>}
 
<------>ftime(&before);
<------>pread(fd, &old_tsc,  sizeof(old_tsc), 0x10);
<------>pread(fd, &old_aperf,  sizeof(old_mperf), 0xe7);
<------>pread(fd, &old_mperf,  sizeof(old_aperf), 0xe8);
 
<------>for (i=0; i<0x8fffffff; i++) {
<------><------>sqrt(i);
<------>}
 
<------>ftime(&after);
<------>pread(fd, &new_tsc,  sizeof(new_tsc), 0x10);
<------>pread(fd, &new_aperf,  sizeof(new_mperf), 0xe7);
<------>pread(fd, &new_mperf,  sizeof(new_aperf), 0xe8);
 
<------>tsc = new_tsc-old_tsc;
<------>aperf = new_aperf-old_aperf;
<------>mperf = new_mperf-old_mperf;
 
<------>start = before.time*1000 + before.millitm;
<------>finish = after.time*1000 + after.millitm;
<------>total = finish - start;
 
<------>printf("runTime: %4.2f\n", 1.0*total/1000);
<------>printf("freq: %7.0f\n", tsc / (1.0*aperf / (1.0 * mperf)) / total);
<------>return 0;
}