bgl.c

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#include <ross.h>
 
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 = 0;
#ifdef ROSS_timing
        unsigned long int upper, lower,tmp;
 
        __asm__ volatile(
                "0:                  \n"
                "\tmftbu   %0           \n"
                "\tmftb    %1           \n"
                "\tmftbu   %2           \n"
                "\tcmpw    %2,%0        \n"
                "\tbne     0b         \n"
                : "=r"(upper),"=r"(lower),"=r"(tmp)
        );
 
        result = upper;
        result = result<<32;
        result = result|lower;
#endif
        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;
}