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H. Peter Anvin
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Check in msr-tools 1.1
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‎MAKEDEV-cpuid-msr‎

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#!/bin/sh
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msr_major=202
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cpuid_major=203
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n=0
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while [ $n -lt 32 ]; do
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mkdir -m 0755 -p /dev/cpu/$n
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mknod /dev/cpu/$n/msr -m 0600 c $msr_major $n
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mknod /dev/cpu/$n/cpuid -m 0444 c $cpuid_major $n
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n=`expr $n + 1`
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done
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‎Makefile‎

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#ident "$Id$"
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## -----------------------------------------------------------------------
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##
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## Copyright 2000 Transmeta Corporation - All Rights Reserved
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##
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## This program is free software; you can redistribute it and/or modify
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## it under the terms of the GNU General Public License as published by
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## the Free Software Foundation, Inc., 675 Mass Ave, Cambridge MA 02139,
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## USA; either version 2 of the License, or (at your option) any later
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## version; incorporated herein by reference.
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##
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## -----------------------------------------------------------------------
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#
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# Makefile for MSRs
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#
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CC = gcc -Wall
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CFLAGS = -g -O2 -fomit-frame-pointer
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LDFLAGS =
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BIN = wrmsr rdmsr
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sbindir = /usr/sbin
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all: $(BIN)
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clean:
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rm -f *.o $(BIN)
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distclean: clean
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rm -f *~ \#*
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install: all
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install -m 755 $(BIN) $(sbindir)
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.o:
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$(CC) $(LDFLAGS) -o $@ $<
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.c.o:
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$(CC) $(CFLAGS) -o $@ $<
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.c:
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$(CC) $(CFLAGS) $(LDFLAGS) -o $@ $<

‎rdmsr.c‎

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#ident "$Id$"
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/* ----------------------------------------------------------------------- *
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*
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* Copyright 2000 Transmeta Corporation - All Rights Reserved
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, Inc., 675 Mass Ave, Cambridge MA 02139,
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* USA; either version 2 of the License, or (at your option) any later
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* version; incorporated herein by reference.
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*
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* ----------------------------------------------------------------------- */
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/*
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* rdmsr.c
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*
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* Utility to read an MSR.
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*/
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#include <errno.h>
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#include <stdio.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <getopt.h>
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#include <inttypes.h>
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#include <sys/types.h>
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#include "version.h"
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struct option long_options[] = {
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{ "help", 0, 0, 'h' },
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{ "version", 0, 0, 'V' },
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{ "hexadecimal", 0, 0, 'x' },
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{ "capital-hexadecimal", 0, 0, 'X' },
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{ "decimal", 0, 0, 'd' },
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{ "signed-decimal", 0, 0, 'd' },
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{ "unsigned-decimal", 0, 0, 'u' },
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{ "octal", 0, 0, 'o' },
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{ "c-language", 0, 0, 'c' },
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{ "zero-fill", 0, 0, '0' },
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{ "zero-pad", 0, 0, '0' },
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{ "raw", 0, 0, 'r' },
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{ "processor", 1, 0, 'p' },
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{ "cpu", 1, 0, 'p' },
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{ "bitfield", 1, 0, 'f' },
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{ 0, 0, 0, 0 }
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};
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/* Number of decimal digits for a certain number of bits */
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/* (int) ceil(log(2^n)/log(10)) */
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int decdigits[] = {
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1, 1, 1, 1, 2, 2, 2, 3, 3, 3, 4, 4, 4, 4, 5, 5,
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5, 6, 6, 6, 7, 7, 7, 7, 8, 8, 8, 9, 9, 9, 10, 10,
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10, 10, 11, 11, 11, 12, 12, 12, 13, 13, 13, 13, 14, 14, 14, 15,
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15, 15, 16, 16, 16, 16, 17, 17, 17, 18, 18, 18, 19, 19, 19, 19,
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20
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};
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#define mo_hex 0x01
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#define mo_dec 0x02
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#define mo_oct 0x03
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#define mo_raw 0x04
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#define mo_uns 0x05
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#define mo_chx 0x06
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#define mo_mask 0x0f
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#define mo_fill 0x40
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#define mo_c 0x80
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const char *program;
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void usage(void)
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{
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fprintf(stderr,
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"Usage: %s [options] regno\n"
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" --help -h Print this help\n"
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" --version -V Print current version\n"
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" --hexadecimal -x Hexadecimal output (lower case)\n"
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" --captial-hex -X Hexadecimal output (upper case)\n"
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" --decimal -d Signed decimal output\n"
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" --unsigned -u Unsigned decimal output\n"
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" --octal -o Octal output\n"
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" --c-language -c Format output as a C language constant\n"
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" --zero-pad -0 Output leading zeroes\n"
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" --raw -r Raw binary output\n"
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" --processor # -p Select processor number (default 0)\n"
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" --bitfield h:l -f Output bits [h:l] only\n"
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, program);
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}
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int main(int argc, char *argv[])
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{
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uint32_t reg;
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uint64_t data;
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int c, fd;
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int mode = mo_hex;
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int cpu = 0;
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unsigned int highbit = 63, lowbit = 0, bits;
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unsigned long arg;
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char *endarg;
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char *pat;
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int width;
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char msr_file_name[64];
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program = argv[0];
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while ( (c = getopt_long(argc,argv,"hVxXdoruc0p:f:",long_options,NULL)) != -1 ) {
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switch ( c ) {
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case 'h':
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usage();
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exit(0);
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case 'v':
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fprintf(stderr, "%s: version %s\n", program, VERSION_STRING);
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exit(0);
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case 'x':
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mode = (mode & ~mo_mask) | mo_hex;
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break;
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case 'X':
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mode = (mode & ~mo_mask) | mo_chx;
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break;
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case 'o':
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mode = (mode & ~mo_mask) | mo_oct;
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break;
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case 'd':
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mode = (mode & ~mo_mask) | mo_dec;
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break;
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case 'r':
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mode = (mode & ~mo_mask) | mo_raw;
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break;
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case 'u':
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mode = (mode & ~mo_mask) | mo_uns;
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break;
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case 'c':
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mode |= mo_c;
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break;
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case '0':
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mode |= mo_fill;
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break;
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case 'p':
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arg = strtoul(optarg, &endarg, 0);
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if ( *endarg || arg > 255 ) {
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usage();
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exit(127);
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}
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cpu = (int)arg;
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break;
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case 'f':
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{
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if ( sscanf(optarg, "%u:%u", &highbit, &lowbit) != 2 ||
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highbit > 63 || lowbit > highbit ) {
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usage();
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exit(127);
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}
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}
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break;
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default:
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usage();
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exit(127);
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}
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}
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if ( optind != argc-1 ) {
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/* Should have exactly one argument */
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usage();
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exit(127);
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}
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reg = strtoul(argv[optind], NULL, 0);
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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 < 0 ) {
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if ( errno == ENXIO ) {
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fprintf(stderr, "rdmsr: No CPU %d\n", cpu);
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exit(2);
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} else if ( errno == EIO ) {
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fprintf(stderr, "rdmsr: CPU %d doesn't support MSRs\n", cpu);
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exit(3);
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} else {
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perror("rdmsr:open");
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exit(127);
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}
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}
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if ( lseek(fd, reg, SEEK_SET) != reg ) {
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perror("rdmsr:seek");
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exit(127);
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}
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if ( read(fd, &data, sizeof data) != sizeof data ) {
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perror("rdmsr:read");
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exit(127);
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}
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close(fd);
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bits = highbit-lowbit+1;
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if ( bits < 64 ) {
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/* Show only part of register */
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data >>= lowbit;
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data &= (1ULL << bits)-1;
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}
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pat = NULL;
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width = 1; /* Default */
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switch(mode) {
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case mo_hex:
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pat = "%*llx\n";
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break;
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case mo_chx:
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pat = "%*llX\n";
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break;
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case mo_dec:
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case mo_dec|mo_c:
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case mo_dec|mo_fill|mo_c:
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/* Make sure we get sign correct */
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if ( data & (1ULL << (bits-1)) ) {
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data &= ~(1ULL << (bits-1));
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data = -data;
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}
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pat = "%*lld\n";
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break;
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case mo_uns:
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pat = "%*llu\n";
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break;
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case mo_oct:
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pat = "%*llo\n";
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break;
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case mo_hex|mo_c:
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pat = "0x%*llx\n";
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break;
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case mo_chx|mo_c:
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pat = "0x%*llX\n";
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break;
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case mo_oct|mo_c:
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pat = "0%*llo\n";
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break;
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case mo_uns|mo_c:
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case mo_uns|mo_fill|mo_c:
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pat = "%*lluU\n";
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break;
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case mo_hex|mo_fill:
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pat = "%0*llx\n";
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width = (bits+3)/4;
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break;
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case mo_chx|mo_fill:
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pat = "%0*llX\n";
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width = (bits+3)/4;
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break;
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case mo_dec|mo_fill:
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/* Make sure we get sign correct */
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if ( data & (1ULL << (bits-1)) ) {
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data &= ~(1ULL << (bits-1));
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data = -data;
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}
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pat = "%0*lld\n";
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width = decdigits[bits-1]+1;
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break;
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case mo_uns|mo_fill:
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pat = "%0*llu\n";
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width = decdigits[bits];
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break;
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case mo_oct|mo_fill:
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pat = "%0*llo\n";
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width = (bits+2)/3;
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break;
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case mo_hex|mo_fill|mo_c:
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pat = "0x%0*llx\n";
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width = (bits+3)/4;
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break;
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case mo_chx|mo_fill|mo_c:
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pat = "0x%0*llX\n";
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width = (bits+3)/4;
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break;
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case mo_oct|mo_fill|mo_c:
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pat = "0%0*llo\n";
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width = (bits+2)/3;
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break;
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case mo_raw:
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case mo_raw|mo_fill:
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fwrite(&data,sizeof data,1,stdout);
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break;
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case mo_raw|mo_c:
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case mo_raw|mo_fill|mo_c:
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{
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unsigned char *p = (unsigned char *)&data;
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int i;
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for ( i = 0 ; i < sizeof data ; i++ ) {
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printf("%s0x%02x", i?",":"{", (unsigned int)(*p++));
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}
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printf("}\n");
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}
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break;
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default:
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fprintf(stderr, "%s: Impossible case, line %d\n", program, __LINE__);
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exit(127);
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}
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if ( width < 1 )
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width = 1;
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if ( pat )
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printf(pat, width, data);
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exit(0);
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}

‎version.h‎

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#ifndef MSR_TOOLS_VERSION_H
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#define MSR_TOOLS_VERSION_H
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#define VERSION_STRING "msr-tools-1.1"
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#endif

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