[mirror_ubuntu-bionic-kernel.git] / arch / ia64 / include / asm / timex.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_IA64_TIMEX_H
#define _ASM_IA64_TIMEX_H

/*
 * Copyright (C) 1998-2001, 2003 Hewlett-Packard Co
 *	David Mosberger-Tang <davidm@hpl.hp.com>
 */
/*
 * 2001/01/18 davidm	Removed CLOCK_TICK_RATE.  It makes no sense on IA-64.
 *			Also removed cacheflush_time as it's entirely unused.
 */

#include <asm/intrinsics.h>
#include <asm/processor.h>

typedef unsigned long cycles_t;

extern void (*ia64_udelay)(unsigned long usecs);

/*
 * For performance reasons, we don't want to define CLOCK_TICK_TRATE as
 * local_cpu_data->itc_rate.  Fortunately, we don't have to, either: according to George
 * Anzinger, 1/CLOCK_TICK_RATE is taken as the resolution of the timer clock.  The time
 * calculation assumes that you will use enough of these so that your tick size <= 1/HZ.
 * If the calculation shows that your CLOCK_TICK_RATE can not supply exactly 1/HZ ticks,
 * the actual value is calculated and used to update the wall clock each jiffie.  Setting
 * the CLOCK_TICK_RATE to x*HZ insures that the calculation will find no errors.  Hence we
 * pick a multiple of HZ which gives us a (totally virtual) CLOCK_TICK_RATE of about
 * 100MHz.
 */
#define CLOCK_TICK_RATE		(HZ * 100000UL)

static inline cycles_t
get_cycles (void)
{
	cycles_t ret;

	ret = ia64_getreg(_IA64_REG_AR_ITC);
	return ret;
}

extern void ia64_cpu_local_tick (void);
extern unsigned long long ia64_native_sched_clock (void);

#endif /* _ASM_IA64_TIMEX_H */
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
1da177e4 LT	2	#ifndef _ASM_IA64_TIMEX_H
	3	#define _ASM_IA64_TIMEX_H
	4
	5	/*
	6	* Copyright (C) 1998-2001, 2003 Hewlett-Packard Co
	7	* David Mosberger-Tang <davidm@hpl.hp.com>
	8	*/
	9	/*
	10	* 2001/01/18 davidm Removed CLOCK_TICK_RATE. It makes no sense on IA-64.
	11	* Also removed cacheflush_time as it's entirely unused.
	12	*/
	13
	14	#include <asm/intrinsics.h>
	15	#include <asm/processor.h>
	16
	17	typedef unsigned long cycles_t;
	18
defbb2c9	19	extern void (*ia64_udelay)(unsigned long usecs);
defbb2c9	20
1da177e4 LT	21	/*
	22	* For performance reasons, we don't want to define CLOCK_TICK_TRATE as
	23	* local_cpu_data->itc_rate. Fortunately, we don't have to, either: according to George
	24	* Anzinger, 1/CLOCK_TICK_RATE is taken as the resolution of the timer clock. The time
	25	* calculation assumes that you will use enough of these so that your tick size <= 1/HZ.
	26	* If the calculation shows that your CLOCK_TICK_RATE can not supply exactly 1/HZ ticks,
	27	* the actual value is calculated and used to update the wall clock each jiffie. Setting
	28	* the CLOCK_TICK_RATE to x*HZ insures that the calculation will find no errors. Hence we
	29	* pick a multiple of HZ which gives us a (totally virtual) CLOCK_TICK_RATE of about
	30	* 100MHz.
	31	*/
	32	#define CLOCK_TICK_RATE (HZ * 100000UL)
	33
	34	static inline cycles_t
	35	get_cycles (void)
	36	{
	37	cycles_t ret;
	38
	39	ret = ia64_getreg(_IA64_REG_AR_ITC);
	40	return ret;
	41	}
	42
1b4a18fc	43	extern void ia64_cpu_local_tick (void);
f927da17	44	extern unsigned long long ia64_native_sched_clock (void);
1b4a18fc	45
1da177e4	46	#endif /* _ASM_IA64_TIMEX_H */