/*
|
* Copyright (C) 2013 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 _COBALT_TICKS_H
|
#define _COBALT_TICKS_H
|
|
#include <stdbool.h>
|
#include <cobalt/uapi/kernel/types.h>
|
|
/*
|
* Depending on the underlying pipeline support, we may represent time
|
* stamps as count of nanoseconds (Dovetail), or as values of the
|
* hardware tick counter (aka TSC) available with the platform
|
* (I-pipe). In the latter - legacy - case, we need to convert from
|
* TSC values to nanoseconds and conversely via scaled maths. This
|
* indirection will go away once support for the I-pipe is removed.
|
*/
|
|
#ifdef __cplusplus
|
extern "C" {
|
#endif
|
|
extern unsigned long long __cobalt_tsc_clockfreq;
|
|
static inline bool cobalt_use_legacy_tsc(void)
|
{
|
return !!__cobalt_tsc_clockfreq;
|
}
|
|
xnsticks_t __cobalt_tsc_to_ns(xnsticks_t ticks);
|
|
xnsticks_t __cobalt_tsc_to_ns_rounded(xnsticks_t ticks);
|
|
xnsticks_t __cobalt_ns_to_tsc(xnsticks_t ns);
|
|
static inline
|
xnsticks_t cobalt_ns_to_ticks(xnsticks_t ns)
|
{
|
if (cobalt_use_legacy_tsc())
|
return __cobalt_ns_to_tsc(ns);
|
|
return ns;
|
}
|
|
static inline
|
xnsticks_t cobalt_ticks_to_ns(xnsticks_t ticks)
|
{
|
if (cobalt_use_legacy_tsc())
|
return __cobalt_tsc_to_ns(ticks);
|
|
return ticks;
|
}
|
|
static inline
|
xnsticks_t cobalt_ticks_to_ns_rounded(xnsticks_t ticks)
|
{
|
if (cobalt_use_legacy_tsc())
|
return __cobalt_tsc_to_ns_rounded(ticks);
|
|
return ticks;
|
}
|
|
unsigned long long cobalt_divrem_billion(unsigned long long value,
|
unsigned long *rem);
|
#ifdef __cplusplus
|
}
|
#endif
|
|
#endif /* !_COBALT_TICKS_H */
|
