Attachment 121632 Details for Bug 228344

Program for reading the fixed-range MTRR values man

print_fixed_range_mtrrs.c (text/plain), 1.25 KB, created by Bernhard Kaindl on 2007-02-28 17:41:22 UTC

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Creator: Bernhard Kaindl

Created: 2007-02-28 17:41:22 UTC

Size: 1.25 KB

patch

obsolete

>/*
> * 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);
>}

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