/usr/include/xenomai/asm-generic/bits/timeconv.h is in libxenomai-dev 2.6.4+dfsg-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* Copyright (C) 2009 Philippe Gerum <rpm@xenomai.org>.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
#ifndef _XENO_ASM_GENERIC_BITS_TIMECONV_H
#define _XENO_ASM_GENERIC_BITS_TIMECONV_H
#include <asm/xenomai/arith.h>
static unsigned long long clockfreq;
#ifdef XNARCH_HAVE_LLMULSHFT
static unsigned int tsc_scale, tsc_shift;
#ifdef XNARCH_HAVE_NODIV_LLIMD
static rthal_u32frac_t tsc_frac;
static rthal_u32frac_t bln_frac;
#endif
#endif
#ifdef XNARCH_HAVE_LLMULSHFT
long long xnarch_tsc_to_ns(long long ticks)
{
return xnarch_llmulshft(ticks, tsc_scale, tsc_shift);
}
long long xnarch_tsc_to_ns_rounded(long long ticks)
{
unsigned int shift = tsc_shift - 1;
return (xnarch_llmulshft(ticks, tsc_scale, shift) + 1) / 2;
}
#ifdef XNARCH_HAVE_NODIV_LLIMD
long long xnarch_ns_to_tsc(long long ns)
{
return xnarch_nodiv_llimd(ns, tsc_frac.frac, tsc_frac.integ);
}
unsigned long long xnarch_divrem_billion(unsigned long long value,
unsigned long *rem)
{
unsigned long long q;
unsigned r;
q = xnarch_nodiv_ullimd(value, bln_frac.frac, bln_frac.integ);
r = value - q * 1000000000;
if (r >= 1000000000) {
++q;
r -= 1000000000;
}
*rem = r;
return q;
}
#else /* !XNARCH_HAVE_NODIV_LLIMD */
long long xnarch_ns_to_tsc(long long ns)
{
return xnarch_llimd(ns, 1 << tsc_shift, tsc_scale);
}
#endif /* !XNARCH_HAVE_NODIV_LLIMD */
#else /* !XNARCH_HAVE_LLMULSHFT */
long long xnarch_tsc_to_ns(long long ticks)
{
return xnarch_llimd(ticks, 1000000000, clockfreq);
}
long long xnarch_tsc_to_ns_rounded(long long ticks)
{
return (xnarch_llimd(ticks, 1000000000, clockfreq/2) + 1) / 2;
}
long long xnarch_ns_to_tsc(long long ns)
{
return xnarch_llimd(ns, clockfreq, 1000000000);
}
#endif /* !XNARCH_HAVE_LLMULSHFT */
#ifndef XNARCH_HAVE_NODIV_LLIMD
unsigned long long xnarch_divrem_billion(unsigned long long value,
unsigned long *rem)
{
return xnarch_ulldiv(value, 1000000000, rem);
}
#endif /* !XNARCH_HAVE_NODIV_LLIMD */
static void xnarch_init_timeconv(unsigned long long freq)
{
clockfreq = freq;
#ifdef XNARCH_HAVE_LLMULSHFT
xnarch_init_llmulshft(1000000000, freq, &tsc_scale, &tsc_shift);
#ifdef XNARCH_HAVE_NODIV_LLIMD
xnarch_init_u32frac(&tsc_frac, 1 << tsc_shift, tsc_scale);
xnarch_init_u32frac(&bln_frac, 1, 1000000000);
#endif
#endif
}
#ifdef __KERNEL__
EXPORT_SYMBOL_GPL(xnarch_tsc_to_ns);
EXPORT_SYMBOL_GPL(xnarch_ns_to_tsc);
EXPORT_SYMBOL_GPL(xnarch_divrem_billion);
#endif /* __KERNEL__ */
#endif /* !_XENO_ASM_GENERIC_BITS_TIMECONV_H */
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