1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * linux/include/asm-alpha/timex.h
4 *
5 * ALPHA architecture timex specifications
6 */
7 #ifndef _ASMALPHA_TIMEX_H
8 #define _ASMALPHA_TIMEX_H
9
10 /* With only one or two oddballs, we use the RTC as the ticker, selecting
11 the 32.768kHz reference clock, which nicely divides down to our HZ. */
12 #define CLOCK_TICK_RATE 32768
13
14 /*
15 * Standard way to access the cycle counter.
16 * Currently only used on SMP for scheduling.
17 *
18 * Only the low 32 bits are available as a continuously counting entity.
19 * But this only means we'll force a reschedule every 8 seconds or so,
20 * which isn't an evil thing.
21 */
22
23 typedef unsigned int cycles_t;
24
25 static inline cycles_t get_cycles (void)
26 {
27 cycles_t ret;
28 __asm__ __volatile__ ("rpcc %0" : "=r"(ret));
29 return ret;
30 }
31
32 #endif