/*
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* Copyright (C) 2001,2002,2003,2004,2005 Philippe Gerum <rpm@xenomai.org>.
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*
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* Xenomai is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* Xenomai is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Xenomai; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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* 02111-1307, USA.
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*/
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#ifndef _COBALT_X86_ASM_CALIBRATION_H
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#define _COBALT_X86_ASM_CALIBRATION_H
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#include <asm/processor.h>
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static inline unsigned long __get_bogomips(void)
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{
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return this_cpu_read(cpu_info.loops_per_jiffy)/(500000/HZ);
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}
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static inline void xnarch_get_latencies(struct xnclock_gravity *p)
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{
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unsigned long sched_latency;
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#if CONFIG_XENO_OPT_TIMING_SCHEDLAT != 0
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sched_latency = CONFIG_XENO_OPT_TIMING_SCHEDLAT;
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#else /* !CONFIG_XENO_OPT_TIMING_SCHEDLAT */
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if (strcmp(ipipe_timer_name(), "lapic") == 0) {
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#ifdef CONFIG_SMP
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if (num_online_cpus() > 1)
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sched_latency = 3350;
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else
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sched_latency = 2000;
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#else /* !SMP */
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sched_latency = 1000;
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#endif /* !SMP */
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} else if (strcmp(ipipe_timer_name(), "pit")) { /* HPET */
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#ifdef CONFIG_SMP
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if (num_online_cpus() > 1)
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sched_latency = 3350;
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else
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sched_latency = 1500;
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#else /* !SMP */
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sched_latency = 1000;
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#endif /* !SMP */
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} else {
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sched_latency = (__get_bogomips() < 250 ? 17000 :
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__get_bogomips() < 2500 ? 4200 :
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3500);
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#ifdef CONFIG_SMP
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sched_latency += 1000;
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#endif /* CONFIG_SMP */
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}
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#endif /* !CONFIG_XENO_OPT_TIMING_SCHEDLAT */
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p->user = xnclock_ns_to_ticks(&nkclock, sched_latency);
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p->kernel = xnclock_ns_to_ticks(&nkclock,
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CONFIG_XENO_OPT_TIMING_KSCHEDLAT);
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p->irq = xnclock_ns_to_ticks(&nkclock, CONFIG_XENO_OPT_TIMING_IRQLAT);
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}
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#endif /* !_COBALT_X86_ASM_CALIBRATION_H */
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