i386.c

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#include <ross.h>

#ifndef __GNUC__
#  error gcc asm extensions required
#endif
#ifndef __i386__
#  error only i386 platform supported
#endif

static const tw_optdef clock_opts [] =
{
        TWOPT_GROUP("ROSS Timing"),
        TWOPT_ULONGLONG("clock-rate", g_tw_clock_rate, "CPU Clock Rate"),
        TWOPT_END()
};

const tw_optdef *tw_clock_setup(void)
{
        return clock_opts;
}

tw_clock tw_clock_read(void)
{
        tw_clock result;
        do {
                __asm__ __volatile__("rdtsc" : "=A" (result)); 
        } while (__builtin_expect ((int) result == -1, 0));
        return result;
}

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;
}