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32 lines
758 B
32 lines
758 B
20 years ago
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/*
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* linux/include/asm-alpha/timex.h
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*
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* ALPHA architecture timex specifications
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*/
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#ifndef _ASMALPHA_TIMEX_H
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#define _ASMALPHA_TIMEX_H
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/* With only one or two oddballs, we use the RTC as the ticker, selecting
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the 32.768kHz reference clock, which nicely divides down to our HZ. */
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#define CLOCK_TICK_RATE 32768
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/*
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* Standard way to access the cycle counter.
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* Currently only used on SMP for scheduling.
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*
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* Only the low 32 bits are available as a continuously counting entity.
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* But this only means we'll force a reschedule every 8 seconds or so,
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* which isn't an evil thing.
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*/
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typedef unsigned int cycles_t;
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static inline cycles_t get_cycles (void)
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{
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cycles_t ret;
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__asm__ __volatile__ ("rpcc %0" : "=r"(ret));
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return ret;
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}
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#endif
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