#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>

int msr(int cpu, unsigned int index, unsigned long *lo, unsigned long *hi)
{
	char cpuname[16];
	unsigned char buffer[8];
	int fh;

	sprintf (cpuname, "/dev/cpu/%d/msr", cpu);

	fh = open (cpuname, O_RDONLY);
	if (fh==-1)
		return (0);

	lseek (fh, index, SEEK_CUR);

	if (fh != -1) {

		if (read (fh, &buffer[0], 8) != 8) {
			close (fh);
			return (0);
		}

		*lo = (*(unsigned long *)buffer);
		*hi = (*(unsigned long *)(buffer+4));
	}
	close (fh);
	return (1);
}


int main (void)
{
	unsigned long lo=0, hi=0;
	unsigned int index;

	for (index=0x00000000; index<0xFFFFFFFF; index++) {
		if (msr(0, index, &lo, &hi) == 1)
			printf ("MSR: %lx, %08lx %08lx\n", index, lo, hi);
	}
	return (0);
}