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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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
22typedef unsigned int cycles_t;
23
24static 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