NS_PER_TICK
ticks = ns / NS_PER_TICK;
ticks = ns / NS_PER_TICK;
ticks = ns / NS_PER_TICK;
tv.tv_usec = (i8253_channel[chn].start * NS_PER_TICK) / 1000;
tv.tv_usec = (ctr->start * NS_PER_TICK) / 1000;