/*

 * Test program for reading current MTRR values

 *

 *	(C) 2007 Bernhard Kaindl

 *	(C) 2000 Dave Jones, Arjan van de Ven.

 */



#include <stdio.h>

#include <unistd.h>



/*  rdmsr - read MSR, taken from Powertweak Linux

 *	(C) 2000 Dave Jones, Arjan van de Ven.

 * 	Licensed under the terms of the GNU GPL License version 2.

 */

int rdmsr(int cpu, unsigned long msrindex, unsigned long long *val)

{

	char cpuname[36];

	int fh, ret;



	snprintf (cpuname,15, "/dev/cpu/%d/msr", cpu);



	fh = open (cpuname, 0);



	if (fh==-1)

		ret = -1;

	else {

		lseek (fh, msrindex, SEEK_SET);

		ret = (read (fh, val, 8) == 8);

		close (fh);

	}

	return ret;

}



int print_msr_cpu(int cpu, int reg)

{

	unsigned long long val;

	int ret;



	if ((ret = rdmsr(cpu, reg, &val)) > 0)

		printf("%016llx", val);

	return ret;

}



print_msr(int reg)

{

	int i = 1, cpu = 0;

	printf("MSR 0x%03x: ", reg);



	if (print_msr_cpu(cpu++, reg) <= 0)

		printf("read error - Is msr.ko loaded and are the devices created?\n");



	while (cpu < 16) {

		printf(" | ");

		if (print_msr_cpu(cpu++, reg) <= 0)

			break;

	}



	printf("\n");

}



main() {

	int i;



	print_msr(0x250);

	print_msr(0x258);

	print_msr(0x259);

	for (i=0x268; i<0x270; i++)

		print_msr(i);

}