/usr/include/xenomai/asm-x86/calibration.h is in libxenomai-dev 2.6.2.1-2ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 | /*
* 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 _XENO_ASM_X86_CALIBRATION_H
#define _XENO_ASM_X86_CALIBRATION_H
#ifndef _XENO_ASM_X86_BITS_INIT_H
#error "please don't include asm/calibration.h directly"
#endif
#include <asm/processor.h>
static inline unsigned long xnarch_get_sched_latency (void)
{
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(RTHAL_TIMER_DEVICE, "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(RTHAL_TIMER_DEVICE, "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 {
/*
* Use the bogomips formula to identify low-end x86 boards
* when using the 8254 PIT. The following is still grossly
* experimental and needs work (i.e. more specific cases), but
* the approach is definitely saner than previous attempts to
* guess such value dynamically.
*/
#ifdef CONFIG_IPIPE_CORE
#define __bogomips (this_cpu_read(cpu_info.loops_per_jiffy)/(500000/HZ))
#elif LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,38)
#define __bogomips (cpu_info.loops_per_jiffy/(500000/HZ))
#else
#define __bogomips (current_cpu_data.loops_per_jiffy/(500000/HZ))
#endif
sched_latency = (__bogomips < 250 ? 17000 :
__bogomips < 2500 ? 4200 :
3500);
#undef __bogomips
#ifdef CONFIG_SMP
sched_latency += 1000;
#endif /* CONFIG_SMP */
}
#endif /* !CONFIG_XENO_OPT_TIMING_SCHEDLAT */
return sched_latency;
}
#endif /* !_XENO_ASM_X86_CALIBRATION_H */
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