calibration.h

/*
 * Copyright (C) 2001,2002,2003,2004,2005 Philippe Gerum <rpm@xenomai.org>.
 *
 * Xenomai 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.
 *
 * Xenomai 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 Xenomai; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
 * 02111-1307, USA.
 */
#ifndef _COBALT_X86_ASM_CALIBRATION_H
#define _COBALT_X86_ASM_CALIBRATION_H

#include <asm/processor.h>

static inline unsigned long __get_bogomips(void)
{
        return this_cpu_read(cpu_info.loops_per_jiffy)/(500000/HZ);
}

static inline void xnarch_get_latencies(struct xnclock_gravity *p)
{
        unsigned long sched_latency;

#if CONFIG_XENO_OPT_TIMING_SCHEDLAT != 0
        sched_latency = CONFIG_XENO_OPT_TIMING_SCHEDLAT;
#else /* !CONFIG_XENO_OPT_TIMING_SCHEDLAT */

        if (strcmp(ipipe_timer_name(), "lapic") == 0) {
#ifdef CONFIG_SMP
                if (num_online_cpus() > 1)
                        sched_latency = 3350;
                else
                        sched_latency = 2000;
#else /* !SMP */
                sched_latency = 1000;
#endif /* !SMP */
        } else if (strcmp(ipipe_timer_name(), "pit")) { /* HPET */
#ifdef CONFIG_SMP
                if (num_online_cpus() > 1)
                        sched_latency = 3350;
                else
                        sched_latency = 1500;
#else /* !SMP */
                sched_latency = 1000;
#endif /* !SMP */
        } else {
                sched_latency = (__get_bogomips() < 250 ? 17000 :
                                 __get_bogomips() < 2500 ? 4200 :
                                 3500);
#ifdef CONFIG_SMP
                sched_latency += 1000;
#endif /* CONFIG_SMP */
        }
#endif /* !CONFIG_XENO_OPT_TIMING_SCHEDLAT */

        p->user = sched_latency;
        p->kernel = CONFIG_XENO_OPT_TIMING_KSCHEDLAT;
        p->irq = CONFIG_XENO_OPT_TIMING_IRQLAT;
}

#endif /* !_COBALT_X86_ASM_CALIBRATION_H */