root/trunk/libffado/src/libutil/Time.c

/*
 * Copyright (C) 2005-2007 by Pieter Palmers
 *
 * This file is part of FFADO
 * FFADO = Free Firewire (pro-)audio drivers for linux
 *
 * FFADO is based upon FreeBoB
 *
 * 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, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

/*
 * Copied from the jackd/jackdmp sources
 * function names changed in order to avoid naming problems when using this in
 * a jackd backend.
 */

/* Original license:
 *
 *  Copyright (C) 2001 Paul Davis
 *  Copyright (C) 2004-2006 Grame
 *
 *  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; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 */
#include "Time.h"

#ifdef GETCYCLE_TIME

#include <stdio.h>
freebob_microsecs_t GetMhz(void)
{
        FILE *f = fopen("/proc/cpuinfo", "r");
        if (f == 0)
        {
                perror("can't open /proc/cpuinfo\n");
                exit(1);
        }

        for ( ; ; )
        {
                freebob_microsecs_t mhz;
                int ret;
                char buf[1000];

                if (fgets(buf, sizeof(buf), f) == NULL) {
                        fprintf (stderr,"FATAL: cannot locate cpu MHz in "
                                    "/proc/cpuinfo\n");
                        exit(1);
                }

#if defined(__powerpc__)
                ret = sscanf(buf, "clock\t: %" SCNu64 "MHz", &mhz);
#elif defined( __i386__ ) || defined (__hppa__)  || defined (__ia64__) || \
      defined(__x86_64__)
                ret = sscanf(buf, "cpu MHz         : %" SCNu64, &mhz);
#elif defined( __sparc__ )
                ret = sscanf(buf, "Cpu0Bogo        : %" SCNu64, &mhz);
#elif defined( __mc68000__ )
                ret = sscanf(buf, "Clocking:       %" SCNu64, &mhz);
#elif defined( __s390__  )
                ret = sscanf(buf, "bogomips per cpu: %" SCNu64, &mhz);
#else /* MIPS, ARM, alpha */
                ret = sscanf(buf, "BogoMIPS        : %" SCNu64, &mhz);
#endif 
                if (ret == 1)
                {
                        fclose(f);
                        return (freebob_microsecs_t)mhz;
                }
        }
}

freebob_microsecs_t __freebob_cpu_mhz;

void InitTime()
{
        __freebob_cpu_mhz = GetMhz();
}

#else
void InitTime()
{}

#endif