static int
smapi_ioctl (struct cdev *dev, u_long cmd, caddr_t data, int fflag, struct thread *td)
{
	struct smapi_softc *sc;
	int error;

	error = 0;
	sc = devclass_get_softc(smapi_devclass, dev2unit(dev)); 
        if (sc == NULL) {
                error = ENXIO;
                goto fail;
        }

	switch (cmd) {
	case SMAPIOGHEADER:
		bcopy((caddr_t)sc->header, data,
				sizeof(struct smapi_bios_header)); 
		error = 0;
		break;
	case SMAPIOCGFUNCTION:
		smapi32_offset = sc->smapi32_entry;
		error = smapi32((struct smapi_bios_parameter *)data,
				(struct smapi_bios_parameter *)data);
		break;
	default:
		error = ENOTTY;
	}

fail:
	return (error);
}

static void
mpt_link_peer(struct mpt_softc *mpt)
{
	struct mpt_softc *mpt2;

	if (mpt->unit == 0) {
		return;
	}
	/*
	 * XXX: depends on probe order
	 */
	mpt2 = (struct mpt_softc *)devclass_get_softc(mpt_devclass,mpt->unit-1);

	if (mpt2 == NULL) {
		return;
	}
	if (pci_get_vendor(mpt2->dev) != pci_get_vendor(mpt->dev)) {
		return;
	}
	if (pci_get_device(mpt2->dev) != pci_get_device(mpt->dev)) {
		return;
	}
	mpt->mpt2 = mpt2;
	mpt2->mpt2 = mpt;
	if (mpt->verbose >= MPT_PRT_DEBUG) {
		mpt_prt(mpt, "linking with peer (mpt%d)\n",
		    device_get_unit(mpt2->dev));
	}
}

static int
ucom_dev_write(struct dev_write_args *ap)
{
        cdev_t dev = ap->a_head.a_dev;
        struct ucom_softc *sc;
        struct tty *tp;
        int error;

        sc = devclass_get_softc(ucom_devclass, minor(dev));
        lwkt_gettoken(&tty_token);
        tp = sc->sc_tty;

        DPRINTF("ucomwrite: tp = %p, flag = 0x%x\n", tp, ap->a_ioflag);

#if 0 /* XXXDF */
        if (sc->sc_dying) {
                lwkt_reltoken(&tty_token);
                return (EIO);
        }
#endif

        error = (*linesw[tp->t_line].l_write)(tp, ap->a_uio, ap->a_ioflag);

        DPRINTF("ucomwrite: error = %d\n", error);

        lwkt_reltoken(&tty_token);
        return (error);
}

/*
 * Print the command queue states for controller 0 (callable from DDB)
 */
void
aac_printstate0(void)
{
	struct aac_softc *sc;

	sc = devclass_get_softc(devclass_find("aac"), 0);

	aac_print_queues(sc);
	switch (sc->aac_hwif) {
	case AAC_HWIF_I960RX:
	case AAC_HWIF_NARK:
		device_printf(sc->aac_dev, "IDBR 0x%08x  IIMR 0x%08x  "
		    "IISR 0x%08x\n", AAC_MEM0_GETREG4(sc, AAC_RX_IDBR),
		    AAC_MEM0_GETREG4(sc, AAC_RX_IIMR), AAC_MEM0_GETREG4(sc, AAC_RX_IISR));
		device_printf(sc->aac_dev, "ODBR 0x%08x  OIMR 0x%08x  "
		    "OISR 0x%08x\n", AAC_MEM0_GETREG4(sc, AAC_RX_ODBR),
		    AAC_MEM0_GETREG4(sc, AAC_RX_OIMR), AAC_MEM0_GETREG4(sc, AAC_RX_OISR));
		AAC_MEM0_SETREG4(sc, AAC_RX_OIMR, 0/*~(AAC_DB_COMMAND_READY |
			    AAC_DB_RESPONSE_READY | AAC_DB_PRINTF)*/);
		device_printf(sc->aac_dev, "ODBR 0x%08x  OIMR 0x%08x  "
		    "OISR 0x%08x\n", AAC_MEM0_GETREG4(sc, AAC_RX_ODBR),
		    AAC_MEM0_GETREG4(sc, AAC_RX_OIMR), AAC_MEM0_GETREG4(sc, AAC_RX_OISR));
		break;
	case AAC_HWIF_STRONGARM:
		/* XXX implement */
		break;
	}
}