ppc.c

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#include <ross.h>
 
#ifndef __GNUC__
#  error gcc asm extensions required
#endif
#if !(defined __ppc__ || defined __PPC__)
#  error only ppc platform supported
#endif
 
tw_clock tw_clock_read(void)
{
        unsigned long tbu;
        unsigned long tb1;
        unsigned long tbu1;
 
        do {
                asm volatile(
                        "mftbu %2\n\t"
                        "mftb  %0\n\t"
                        "mftbu %1\n\t"
                : "=r"(tb1), "=r"(tbu), "=r"(tbu1) );
        } while (tbu != tbu1);
 
        return ( ((tw_clock)tbu) << 32 ) | tb1;
}
 
void
tw_clock_init(tw_pe * me)
{
        me->clock_time = 0;
        me->clock_offset = tw_clock_read();
}
 
tw_clock
tw_clock_now(tw_pe * me)
{
        me->clock_time = tw_clock_read() - me->clock_offset;
        return me->clock_time;
}