blob: 2f937e6b27ffc8c5cd1b7f9c6212070691332170 [file] [log] [blame]
#ident "$Id$"
/* ----------------------------------------------------------------------- *
*
* Copyright 2000 Transmeta Corporation - All Rights Reserved
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, Inc., 675 Mass Ave, Cambridge MA 02139,
* USA; either version 2 of the License, or (at your option) any later
* version; incorporated herein by reference.
*
* ----------------------------------------------------------------------- */
/*
* rdmsr.c
*
* Utility to read an MSR.
*/
#include <errno.h>
#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>
#include <getopt.h>
#include <inttypes.h>
#include <sys/types.h>
#include "version.h"
struct option long_options[] = {
{ "help", 0, 0, 'h' },
{ "version", 0, 0, 'V' },
{ "hexadecimal", 0, 0, 'x' },
{ "capital-hexadecimal", 0, 0, 'X' },
{ "decimal", 0, 0, 'd' },
{ "signed-decimal", 0, 0, 'd' },
{ "unsigned-decimal", 0, 0, 'u' },
{ "octal", 0, 0, 'o' },
{ "c-language", 0, 0, 'c' },
{ "zero-fill", 0, 0, '0' },
{ "zero-pad", 0, 0, '0' },
{ "raw", 0, 0, 'r' },
{ "processor", 1, 0, 'p' },
{ "cpu", 1, 0, 'p' },
{ "bitfield", 1, 0, 'f' },
{ 0, 0, 0, 0 }
};
/* Number of decimal digits for a certain number of bits */
/* (int) ceil(log(2^n)/log(10)) */
int decdigits[] = {
1, 1, 1, 1, 2, 2, 2, 3, 3, 3, 4, 4, 4, 4, 5, 5,
5, 6, 6, 6, 7, 7, 7, 7, 8, 8, 8, 9, 9, 9, 10, 10,
10, 10, 11, 11, 11, 12, 12, 12, 13, 13, 13, 13, 14, 14, 14, 15,
15, 15, 16, 16, 16, 16, 17, 17, 17, 18, 18, 18, 19, 19, 19, 19,
20
};
#define mo_hex 0x01
#define mo_dec 0x02
#define mo_oct 0x03
#define mo_raw 0x04
#define mo_uns 0x05
#define mo_chx 0x06
#define mo_mask 0x0f
#define mo_fill 0x40
#define mo_c 0x80
const char *program;
void usage(void)
{
fprintf(stderr,
"Usage: %s [options] regno\n"
" --help -h Print this help\n"
" --version -V Print current version\n"
" --hexadecimal -x Hexadecimal output (lower case)\n"
" --capital-hex -X Hexadecimal output (upper case)\n"
" --decimal -d Signed decimal output\n"
" --unsigned -u Unsigned decimal output\n"
" --octal -o Octal output\n"
" --c-language -c Format output as a C language constant\n"
" --zero-pad -0 Output leading zeroes\n"
" --raw -r Raw binary output\n"
" --processor # -p Select processor number (default 0)\n"
" --bitfield h:l -f Output bits [h:l] only\n"
, program);
}
int main(int argc, char *argv[])
{
uint32_t reg;
uint64_t data;
int c, fd;
int mode = mo_hex;
int cpu = 0;
unsigned int highbit = 63, lowbit = 0, bits;
unsigned long arg;
char *endarg;
char *pat;
int width;
char msr_file_name[64];
program = argv[0];
while ( (c = getopt_long(argc,argv,"hVxXdoruc0p:f:",long_options,NULL)) != -1 ) {
switch ( c ) {
case 'h':
usage();
exit(0);
case 'V':
fprintf(stderr, "%s: version %s\n", program, VERSION_STRING);
exit(0);
case 'x':
mode = (mode & ~mo_mask) | mo_hex;
break;
case 'X':
mode = (mode & ~mo_mask) | mo_chx;
break;
case 'o':
mode = (mode & ~mo_mask) | mo_oct;
break;
case 'd':
mode = (mode & ~mo_mask) | mo_dec;
break;
case 'r':
mode = (mode & ~mo_mask) | mo_raw;
break;
case 'u':
mode = (mode & ~mo_mask) | mo_uns;
break;
case 'c':
mode |= mo_c;
break;
case '0':
mode |= mo_fill;
break;
case 'p':
arg = strtoul(optarg, &endarg, 0);
if ( *endarg || arg > 255 ) {
usage();
exit(127);
}
cpu = (int)arg;
break;
case 'f':
{
if ( sscanf(optarg, "%u:%u", &highbit, &lowbit) != 2 ||
highbit > 63 || lowbit > highbit ) {
usage();
exit(127);
}
}
break;
default:
usage();
exit(127);
}
}
if ( optind != argc-1 ) {
/* Should have exactly one argument */
usage();
exit(127);
}
reg = strtoul(argv[optind], NULL, 0);
sprintf(msr_file_name, "/dev/cpu/%d/msr", cpu);
fd = open(msr_file_name, O_RDONLY);
if ( fd < 0 ) {
if ( errno == ENXIO ) {
fprintf(stderr, "rdmsr: No CPU %d\n", cpu);
exit(2);
} else if ( errno == EIO ) {
fprintf(stderr, "rdmsr: CPU %d doesn't support MSRs\n", cpu);
exit(3);
} else {
perror("rdmsr:open");
exit(127);
}
}
if ( lseek(fd, reg, SEEK_SET) != reg ) {
perror("rdmsr:seek");
exit(127);
}
if ( read(fd, &data, sizeof data) != sizeof data ) {
perror("rdmsr:read");
exit(127);
}
close(fd);
bits = highbit-lowbit+1;
if ( bits < 64 ) {
/* Show only part of register */
data >>= lowbit;
data &= (1ULL << bits)-1;
}
pat = NULL;
width = 1; /* Default */
switch(mode) {
case mo_hex:
pat = "%*llx\n";
break;
case mo_chx:
pat = "%*llX\n";
break;
case mo_dec:
case mo_dec|mo_c:
case mo_dec|mo_fill|mo_c:
/* Make sure we get sign correct */
if ( data & (1ULL << (bits-1)) ) {
data &= ~(1ULL << (bits-1));
data = -data;
}
pat = "%*lld\n";
break;
case mo_uns:
pat = "%*llu\n";
break;
case mo_oct:
pat = "%*llo\n";
break;
case mo_hex|mo_c:
pat = "0x%*llx\n";
break;
case mo_chx|mo_c:
pat = "0x%*llX\n";
break;
case mo_oct|mo_c:
pat = "0%*llo\n";
break;
case mo_uns|mo_c:
case mo_uns|mo_fill|mo_c:
pat = "%*lluU\n";
break;
case mo_hex|mo_fill:
pat = "%0*llx\n";
width = (bits+3)/4;
break;
case mo_chx|mo_fill:
pat = "%0*llX\n";
width = (bits+3)/4;
break;
case mo_dec|mo_fill:
/* Make sure we get sign correct */
if ( data & (1ULL << (bits-1)) ) {
data &= ~(1ULL << (bits-1));
data = -data;
}
pat = "%0*lld\n";
width = decdigits[bits-1]+1;
break;
case mo_uns|mo_fill:
pat = "%0*llu\n";
width = decdigits[bits];
break;
case mo_oct|mo_fill:
pat = "%0*llo\n";
width = (bits+2)/3;
break;
case mo_hex|mo_fill|mo_c:
pat = "0x%0*llx\n";
width = (bits+3)/4;
break;
case mo_chx|mo_fill|mo_c:
pat = "0x%0*llX\n";
width = (bits+3)/4;
break;
case mo_oct|mo_fill|mo_c:
pat = "0%0*llo\n";
width = (bits+2)/3;
break;
case mo_raw:
case mo_raw|mo_fill:
fwrite(&data,sizeof data,1,stdout);
break;
case mo_raw|mo_c:
case mo_raw|mo_fill|mo_c:
{
unsigned char *p = (unsigned char *)&data;
int i;
for ( i = 0 ; i < sizeof data ; i++ ) {
printf("%s0x%02x", i?",":"{", (unsigned int)(*p++));
}
printf("}\n");
}
break;
default:
fprintf(stderr, "%s: Impossible case, line %d\n", program, __LINE__);
exit(127);
}
if ( width < 1 )
width = 1;
if ( pat )
printf(pat, width, data);
exit(0);
}