[linux-block.git] / include / asm-alpha / timex.h

/*
 * linux/include/asm-alpha/timex.h
 *
 * ALPHA architecture timex specifications
 */
#ifndef _ASMALPHA_TIMEX_H
#define _ASMALPHA_TIMEX_H

/* With only one or two oddballs, we use the RTC as the ticker, selecting
   the 32.768kHz reference clock, which nicely divides down to our HZ.  */
#define CLOCK_TICK_RATE	32768

/*
 * Standard way to access the cycle counter.
 * Currently only used on SMP for scheduling.
 *
 * Only the low 32 bits are available as a continuously counting entity. 
 * But this only means we'll force a reschedule every 8 seconds or so,
 * which isn't an evil thing.
 */

typedef unsigned int cycles_t;

static inline cycles_t get_cycles (void)
{
	cycles_t ret;
	__asm__ __volatile__ ("rpcc %0" : "=r"(ret));
	return ret;
}

#endif
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/include/asm-alpha/timex.h
	3	*
	4	* ALPHA architecture timex specifications
	5	*/
	6	#ifndef _ASMALPHA_TIMEX_H
	7	#define _ASMALPHA_TIMEX_H
	8
	9	/* With only one or two oddballs, we use the RTC as the ticker, selecting
	10	the 32.768kHz reference clock, which nicely divides down to our HZ. */
	11	#define CLOCK_TICK_RATE 32768
	12
	13	/*
	14	* Standard way to access the cycle counter.
	15	* Currently only used on SMP for scheduling.
	16	*
	17	* Only the low 32 bits are available as a continuously counting entity.
	18	* But this only means we'll force a reschedule every 8 seconds or so,
	19	* which isn't an evil thing.
	20	*/
	21
	22	typedef unsigned int cycles_t;
	23
	24	static inline cycles_t get_cycles (void)
	25	{
	26	cycles_t ret;
	27	__asm__ __volatile__ ("rpcc %0" : "=r"(ret));
	28	return ret;
	29	}
	30
	31	#endif