timex.h

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#ifndef _ASM_POWERPC_TIMEX_H
#define _ASM_POWERPC_TIMEX_H

#ifdef __KERNEL__

/*
 * PowerPC architecture timex specifications
 */

#include <asm/cputable.h>
#include <asm/reg.h>

#define CLOCK_TICK_RATE 1024000 /* Underlying HZ */

typedef unsigned long cycles_t;

static inline cycles_t get_cycles(void)
{
#ifdef __powerpc64__
    return mftb();
#else
    cycles_t ret;

    /*
     * For the "cycle" counter we use the timebase lower half.
     * Currently only used on SMP.
     */

    ret = 0;

    __asm__ __volatile__(
        "97:    mftb %0\n"
        "99:\n"
        ".section __ftr_fixup,\"a\"\n"
        ".align 2\n"
        "98:\n"
        "   .long %1\n"
        "   .long 0\n"
        "   .long 97b-98b\n"
        "   .long 99b-98b\n"
        "   .long 0\n"
        "   .long 0\n"
        ".previous"
        : "=r" (ret) : "i" (CPU_FTR_601));
    return ret;
#endif
}

#endif  /* __KERNEL__ */
#endif  /* _ASM_POWERPC_TIMEX_H */