cpu_gethpa
hppa_hpa_t hpa = cpu_gethpa(0);
r->iar0 = cpu_gethpa(0) | (31 - irqbit);
regs->io_eim = cpu_gethpa(0) | (31 - ca->ca_irq);
sc->sc_ic->iar = cpu_gethpa(0) | (31 - irqbit);
hppa_hpa_t cpu_gethpa(int n);