hd6446x_intr_establish
hd6446x_intr_establish(HD64461_INTC_PCC0, IST_LEVEL, IPL_TTY,
hd6446x_intr_establish(HD64461_INTC_PCC1, IST_EDGE, IPL_TTY,
hd6446x_intr_establish(HD64461_INTC_UART, IST_LEVEL, IPL_TTY,
hd6446x_intr_establish(irq, mode, level, func, arg);
extern void *hd6446x_intr_establish(int, int, int, int (*)(void *), void *);