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41 lines
691 B
41 lines
691 B
20 years ago
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/*
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* include/asm-ppc/timex.h
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*
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* ppc architecture timex specifications
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*/
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#ifdef __KERNEL__
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#ifndef _ASMppc_TIMEX_H
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#define _ASMppc_TIMEX_H
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#include <linux/config.h>
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#include <asm/cputable.h>
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#define CLOCK_TICK_RATE 1193180 /* Underlying HZ */
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typedef unsigned long cycles_t;
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/*
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* For the "cycle" counter we use the timebase lower half.
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* Currently only used on SMP.
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*/
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static inline cycles_t get_cycles(void)
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{
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cycles_t ret = 0;
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__asm__ __volatile__(
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"98: mftb %0\n"
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"99:\n"
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".section __ftr_fixup,\"a\"\n"
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" .long %1\n"
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" .long 0\n"
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" .long 98b\n"
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" .long 99b\n"
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".previous"
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: "=r" (ret) : "i" (CPU_FTR_601));
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return ret;
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}
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#endif
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#endif /* __KERNEL__ */
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