static void
mpt_set_options(struct mpt_softc *mpt)
{
	int tval;

	tval = 0;
	if (resource_int_value(device_get_name(mpt->dev),
	    device_get_unit(mpt->dev), "debug", &tval) == 0 && tval != 0) {
		mpt->verbose = tval;
	}
	tval = -1;
	if (resource_int_value(device_get_name(mpt->dev),
	    device_get_unit(mpt->dev), "role", &tval) == 0 && tval >= 0 &&
	    tval <= 3) {
		mpt->cfg_role = tval;
		mpt->do_cfg_role = 1;
	}
	tval = 0;
	mpt->msi_enable = 0;
	if (mpt->is_sas)
		mpt->msi_enable = 1;
	if (resource_int_value(device_get_name(mpt->dev),
	    device_get_unit(mpt->dev), "msi_enable", &tval) == 0) {
		mpt->msi_enable = tval;
	}
}

static void
obio_hinted_child(device_t bus, const char *dname, int dunit)
{
	device_t		child;
	long			maddr;
	int			msize;
	int			irq;
	int			result;

	child = BUS_ADD_CHILD(bus, 0, dname, dunit);

	/*
	 * Set hard-wired resources for hinted child using
	 * specific RIDs.
	 */
	resource_long_value(dname, dunit, "maddr", &maddr);
	resource_int_value(dname, dunit, "msize", &msize);


	result = bus_set_resource(child, SYS_RES_MEMORY, 0,
	    maddr, msize);
	if (result != 0)
		device_printf(bus, "warning: bus_set_resource() failed\n");

	if (resource_int_value(dname, dunit, "irq", &irq) == 0) {
		result = bus_set_resource(child, SYS_RES_IRQ, 0, irq, 1);
		if (result != 0)
			device_printf(bus,
			    "warning: bus_set_resource() failed\n");
	}
}

static int
ath_ahb_probe(device_t dev)
{
	int vendor_id, device_id;
	const char* devname;

	/*
	 * Check if a device/vendor ID is provided in hints.
	 */
	if (resource_int_value(device_get_name(dev), device_get_unit(dev),
	    "vendor_id", &vendor_id) != 0) {
		vendor_id = VENDOR_ATHEROS;
	}

	if (resource_int_value(device_get_name(dev), device_get_unit(dev),
	    "device_id", &device_id) != 0) {
		device_id = AR9130_DEVID;
	}

	device_printf(dev, "Vendor=0x%04x, Device=0x%04x\n",
	    vendor_id & 0xffff,
	    device_id & 0xffff);

	/* Attempt to probe */
	devname = ath_hal_probe(vendor_id, device_id);

	if (devname != NULL) {
		device_set_desc(dev, devname);
		return BUS_PROBE_DEFAULT;
	}
	return ENXIO;
}

static int
altera_avgen_nexus_attach(device_t dev)
{
	struct altera_avgen_softc *sc;
	const char *str_fileio, *str_geomio, *str_mmapio;
	const char *str_devname;
	int devunit, error;

	sc = device_get_softc(dev);
	sc->avg_dev = dev;
	sc->avg_unit = device_get_unit(dev);

	/*
	 * Query non-standard hints to find out what operations are permitted
	 * on the device, and whether it is cached.
	 */
	str_fileio = NULL;
	str_geomio = NULL;
	str_mmapio = NULL;
	str_devname = NULL;
	devunit = -1;
	sc->avg_width = 1;
	error = resource_int_value(device_get_name(dev), device_get_unit(dev),
	    ALTERA_AVALON_STR_WIDTH, &sc->avg_width);
	if (error != 0 && error != ENOENT) {
		device_printf(dev, "invalid %s\n", ALTERA_AVALON_STR_WIDTH);
		return (error);
	}
	(void)resource_string_value(device_get_name(dev),
	    device_get_unit(dev), ALTERA_AVALON_STR_FILEIO, &str_fileio);
	(void)resource_string_value(device_get_name(dev),
	    device_get_unit(dev), ALTERA_AVALON_STR_GEOMIO, &str_geomio);
	(void)resource_string_value(device_get_name(dev),
	    device_get_unit(dev), ALTERA_AVALON_STR_MMAPIO, &str_mmapio);
	(void)resource_string_value(device_get_name(dev),
	    device_get_unit(dev), ALTERA_AVALON_STR_DEVNAME, &str_devname);
	(void)resource_int_value(device_get_name(dev), device_get_unit(dev),
	    ALTERA_AVALON_STR_DEVUNIT, &devunit);

	/* Memory allocation and checking. */
	sc->avg_rid = 0;
	sc->avg_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY,
	    &sc->avg_rid, RF_ACTIVE);
	if (sc->avg_res == NULL) {
		device_printf(dev, "couldn't map memory\n");
		return (ENXIO);
	}
	error = altera_avgen_attach(sc, str_fileio, str_geomio, str_mmapio,
	    str_devname, devunit);
	if (error != 0)
		bus_release_resource(dev, SYS_RES_MEMORY, sc->avg_rid,
		    sc->avg_res);
	return (error);
}

static void
ixp425_hinted_child(device_t bus, const char *dname, int dunit)
{
	device_t child;
	struct ixp425_ivar *ivar;

	child = BUS_ADD_CHILD(bus, 0, dname, dunit);
	ivar = IXP425_IVAR(child);
	resource_int_value(dname, dunit, "addr", &ivar->addr);
	resource_int_value(dname, dunit, "irq", &ivar->irq);
}

static void
spibus_hinted_child(device_t bus, const char *dname, int dunit)
{
	device_t child;
	struct spibus_ivar *devi;

	child = BUS_ADD_CHILD(bus, 0, dname, dunit);
	devi = SPIBUS_IVAR(child);
	devi->mode = SPIBUS_MODE_NONE;
	resource_int_value(dname, dunit, "cs", &devi->cs);
	resource_int_value(dname, dunit, "mode", &devi->mode);
}

static void
isahint_add_device(device_t parent, const char *name, int unit)
{
	device_t	child;
	int		sensitive, start, count, t;
	int		order;

	/* device-specific flag overrides any wildcard */
	sensitive = 0;
	if (resource_int_value(name, unit, "sensitive", &sensitive) != 0)
		resource_int_value(name, -1, "sensitive", &sensitive);

	if (sensitive)
		order = ISA_ORDER_SENSITIVE;
	else
		order = ISA_ORDER_SPECULATIVE;

	child = BUS_ADD_CHILD(parent, parent, order, name, unit);
	if (child == 0)
		return;

	start = 0;
	count = 0;
	resource_int_value(name, unit, "port", &start);
	resource_int_value(name, unit, "portsize", &count);
	if (start > 0 || count > 0)
		bus_set_resource(child, SYS_RES_IOPORT, 0, start, count, -1);

	start = 0;
	count = 0;
	resource_int_value(name, unit, "maddr", &start);
	resource_int_value(name, unit, "msize", &count);
	if (start > 0 || count > 0)
		bus_set_resource(child, SYS_RES_MEMORY, 0, start, count, -1);

	if (resource_int_value(name, unit, "irq", &start) == 0 && start > 0) {
		bus_set_resource(child, SYS_RES_IRQ, 0, start, 1,
		    machintr_legacy_intr_cpuid(start));
	}

	if (resource_int_value(name, unit, "drq", &start) == 0 && start >= 0)
		bus_set_resource(child, SYS_RES_DRQ, 0, start, 1, -1);

	if (resource_int_value(name, unit, "flags", &t) == 0)
		device_set_flags(child, t);

	if (resource_int_value(name, unit, "disabled", &t) == 0 && t != 0)
		device_disable(child);
}

/*
 * Map the local APIC and setup necessary interrupt vectors.
 */
void
lapic_init(vm_paddr_t addr)
{
	u_int regs[4];
	int i, arat;

	/* Map the local APIC and setup the spurious interrupt handler. */
	KASSERT(trunc_page(addr) == addr,
	    ("local APIC not aligned on a page boundary"));
	lapic_paddr = addr;
	lapic = pmap_mapdev(addr, sizeof(lapic_t));
	setidt(APIC_SPURIOUS_INT, IDTVEC(spuriousint), SDT_APIC, SEL_KPL,
	    GSEL_APIC);

	/* Perform basic initialization of the BSP's local APIC. */
	lapic_enable();

	/* Set BSP's per-CPU local APIC ID. */
	PCPU_SET(apic_id, lapic_id());

	/* Local APIC timer interrupt. */
	setidt(APIC_TIMER_INT, IDTVEC(timerint), SDT_APIC, SEL_KPL, GSEL_APIC);

	/* Local APIC error interrupt. */
	setidt(APIC_ERROR_INT, IDTVEC(errorint), SDT_APIC, SEL_KPL, GSEL_APIC);

	/* XXX: Thermal interrupt */

	/* Local APIC CMCI. */
	setidt(APIC_CMC_INT, IDTVEC(cmcint), SDT_APICT, SEL_KPL, GSEL_APIC);

	if ((resource_int_value("apic", 0, "clock", &i) != 0 || i != 0)) {
		arat = 0;
		/* Intel CPUID 0x06 EAX[2] set if APIC timer runs in C3. */
		if (cpu_vendor_id == CPU_VENDOR_INTEL && cpu_high >= 6) {
			do_cpuid(0x06, regs);
			if ((regs[0] & CPUTPM1_ARAT) != 0)
				arat = 1;
		}
		bzero(&lapic_et, sizeof(lapic_et));
		lapic_et.et_name = "LAPIC";
		lapic_et.et_flags = ET_FLAGS_PERIODIC | ET_FLAGS_ONESHOT |
		    ET_FLAGS_PERCPU;
		lapic_et.et_quality = 600;
		if (!arat) {
			lapic_et.et_flags |= ET_FLAGS_C3STOP;
			lapic_et.et_quality -= 200;
		}
		lapic_et.et_frequency = 0;
		/* We don't know frequency yet, so trying to guess. */
		lapic_et.et_min_period.sec = 0;
		lapic_et.et_min_period.frac = 0x00001000LL << 32;
		lapic_et.et_max_period.sec = 1;
		lapic_et.et_max_period.frac = 0;
		lapic_et.et_start = lapic_et_start;
		lapic_et.et_stop = lapic_et_stop;
		lapic_et.et_priv = NULL;
		et_register(&lapic_et);
	}
}

static void
iicbus_hinted_child(device_t bus, const char *dname, int dunit)
{
	device_t child;
	int irq;
	struct iicbus_ivar *devi;

	child = BUS_ADD_CHILD(bus, 0, dname, dunit);
	devi = IICBUS_IVAR(child);
	resource_int_value(dname, dunit, "addr", &devi->addr);
	if (resource_int_value(dname, dunit, "irq", &irq) == 0) {
		if (bus_set_resource(child, SYS_RES_IRQ, 0, irq, 1) != 0)
			device_printf(bus,
			    "warning: bus_set_resource() failed\n");
	}
}

int
sc_get_cons_priority(int *unit, int *flags)
{
	const char *at;
	int f, u;

	*unit = -1;
	for (u = 0; u < 16; u++) {
		if (resource_disabled(SC_DRIVER_NAME, u))
			continue;
		if (resource_string_value(SC_DRIVER_NAME, u, "at", &at) != 0)
			continue;
		if (resource_int_value(SC_DRIVER_NAME, u, "flags", &f) != 0)
			f = 0;
		if (f & SC_KERNEL_CONSOLE) {
			/* the user designates this unit to be the console */
			*unit = u;
			*flags = f;
			break;
		}
		if (*unit < 0) {
			/* ...otherwise remember the first found unit */
			*unit = u;
			*flags = f;
		}
	}
	if (*unit < 0) {
		*unit = 0;
		*flags = 0;
	}
	return (CN_INTERNAL);
}

int
ata_setup_interrupt(device_t dev, void *intr_func)
{
    struct ata_pci_controller *ctlr = device_get_softc(dev);
    int i, msi = 0;

    if (!ctlr->legacy) {
	if (resource_int_value(device_get_name(dev),
		device_get_unit(dev), "msi", &i) == 0 && i != 0)
	    msi = 1;
	if (msi && pci_msi_count(dev) > 0 && pci_alloc_msi(dev, &msi) == 0) {
	    ctlr->r_irq_rid = 0x1;
	} else {
	    msi = 0;
	    ctlr->r_irq_rid = ATA_IRQ_RID;
	}
	if (!(ctlr->r_irq = bus_alloc_resource_any(dev, SYS_RES_IRQ,
		&ctlr->r_irq_rid, RF_SHAREABLE | RF_ACTIVE))) {
	    device_printf(dev, "unable to map interrupt\n");
	    if (msi)
		    pci_release_msi(dev);
	    return ENXIO;
	}
	if ((bus_setup_intr(dev, ctlr->r_irq, ATA_INTR_FLAGS, NULL,
			    intr_func, ctlr, &ctlr->handle))) {
	    device_printf(dev, "unable to setup interrupt\n");
	    bus_release_resource(dev,
		SYS_RES_IRQ, ctlr->r_irq_rid, ctlr->r_irq);
	    if (msi)
		    pci_release_msi(dev);
	    return ENXIO;
	}
    }
    return 0;
}

void
iicbus_init_frequency(device_t dev, u_int bus_freq)
{
	struct iicbus_softc *sc = IICBUS_SOFTC(dev);

	/*
	 * If a bus frequency value was passed in, use it.  Otherwise initialize
	 * it first to the standard i2c 100KHz frequency, then override that
	 * from a hint if one exists.
	 */
	if (bus_freq > 0)
		sc->bus_freq = bus_freq;
	else {
		sc->bus_freq = 100000;
		resource_int_value(device_get_name(dev), device_get_unit(dev),
		    "frequency", (int *)&sc->bus_freq);
	}
	/*
	 * Set up the sysctl that allows the bus frequency to be changed.
	 * It is flagged as a tunable so that the user can set the value in
	 * loader(8), and that will override any other setting from any source.
	 * The sysctl tunable/value is the one most directly controlled by the
	 * user and thus the one that always takes precedence.
	 */
	SYSCTL_ADD_UINT(device_get_sysctl_ctx(dev),
	    SYSCTL_CHILDREN(device_get_sysctl_tree(dev)),
	    OID_AUTO, "frequency", CTLFLAG_RW | CTLFLAG_TUN, &sc->bus_freq,
	    sc->bus_freq, "Bus frequency in Hz");
}

static int
gpioled_attach(device_t dev)
{
    struct gpioled_softc *sc;
    int state;
    const char *name;

    sc = device_get_softc(dev);
    sc->sc_dev = dev;
    sc->sc_busdev = device_get_parent(dev);
    GPIOLED_LOCK_INIT(sc);

    state = 0;

    if (resource_string_value(device_get_name(dev),
                              device_get_unit(dev), "name", &name))
        name = NULL;
    resource_int_value(device_get_name(dev),
                       device_get_unit(dev), "invert", &sc->sc_invert);

    sc->sc_leddev = led_create_state(gpioled_control, sc, name ? name :
                                     device_get_nameunit(dev), state);

    return (0);
}

/* 
 * The back door to the keyboard driver!
 * This function is called by the console driver, via the kbdio module,
 * to tickle keyboard drivers when the low-level console is being initialized.
 * Almost nothing in the kernel has been initialied yet.  Try to probe
 * keyboards if possible.
 * NOTE: because of the way the low-level conole is initialized, this routine
 * may be called more than once!!
 */
static int
pckbd_configure(int flags)
{
	keyboard_t *kbd;
	int arg[2];
	int i;

	/* XXX: a kludge to obtain the device configuration flags */
	if (resource_int_value(DRIVER_NAME, 0, "flags", &i) == 0) {
		flags |= i;
		/* if the driver is disabled, unregister the keyboard if any */
		if (resource_disabled(DRIVER_NAME, 0)) {
			i = kbd_find_keyboard(DRIVER_NAME, PC98KBD_DEFAULT);
			if (i >= 0) {
				kbd = kbd_get_keyboard(i);
				kbd_unregister(kbd);
				kbd->kb_flags &= ~KB_REGISTERED;
				return 0;
			}
		}
	}

	/* probe the default keyboard */
	arg[0] = -1;
	arg[1] = -1;
	kbd = NULL;
	if (pckbd_probe(PC98KBD_DEFAULT, arg, flags))
		return 0;
	if (pckbd_init(PC98KBD_DEFAULT, &kbd, arg, flags))
		return 0;

	/* return the number of found keyboards */
	return 1;
}

static void
bvm_cnprobe(struct consdev *cp)
{
	int disabled, port;

	disabled = 0;
	cp->cn_pri = CN_DEAD;

	resource_int_value("bvmconsole", 0, "disabled", &disabled);
	if (!disabled) {
		if (resource_int_value("bvmconsole", 0, "port", &port) == 0)
			bvm_cons_port = port;

		if (inw(bvm_cons_port) == BVM_CONS_SIG)
			cp->cn_pri = CN_REMOTE;
	}
}

int
uart_cpu_getdev(int devtype, struct uart_devinfo *di)
{
	uint32_t i, ivar, vaddr;

	/*
	 * Scan the hints. The IXP425 only have 2 serial ports, so only
	 * scan them.
	 */
	for (i = 0; i < 2; i++) {
		if (resource_int_value("uart", i, "flags", &ivar))
			continue;
		if (devtype == UART_DEV_CONSOLE && !UART_FLAGS_CONSOLE(ivar))
			continue;
		if (devtype == UART_DEV_DBGPORT && !UART_FLAGS_DBGPORT(ivar))
			continue;
		/*
		 * We have a possible device. Make sure it's enabled and
		 * that we have an I/O port.
		 */
		if (resource_int_value("uart", i, "disabled", &ivar) == 0 &&
		    ivar != 0)
			continue;
		if (resource_int_value("uart", i, "addr", &ivar) != 0 ||
		    ivar == 0)
			continue;
		/* Got it. Fill in the instance and return it. */
		di->ops = uart_getops(&uart_ns8250_class);
		di->bas.chan = 0;
		di->bas.bst = &ixp425_a4x_bs_tag;
		di->bas.regshft = 0;
		di->bas.rclk = IXP425_UART_FREQ;
		di->baudrate = 115200;
		di->databits = 8;
		di->stopbits = 1;
		di->parity = UART_PARITY_NONE;
		uart_bus_space_io = NULL;
		uart_bus_space_mem = &ixp425_a4x_bs_tag;

		getvbase(ivar, IXP425_REG_SIZE, &vaddr);
		di->bas.bsh = vaddr;
		return (0);
	}

	return (ENXIO);
}

static void
nvram2env_identify(driver_t * drv, device_t parent)
{
	int i, ivar;

	for (i = 0; !resource_int_value("nvram", i, "base", &ivar); i++)
		BUS_ADD_CHILD(parent, 0, "nvram2env", i);
}

static int
gpioiic_attach(device_t dev)
{
	device_t		bitbang;
#ifdef FDT
	phandle_t		node;
	pcell_t			pin;
#endif
	struct gpiobus_ivar	*devi;
	struct gpioiic_softc	*sc;

	sc = device_get_softc(dev);
	sc->sc_dev = dev;
	sc->sc_busdev = device_get_parent(dev);
	if (resource_int_value(device_get_name(dev),
		device_get_unit(dev), "scl", &sc->scl_pin))
		sc->scl_pin = SCL_PIN_DEFAULT;
	if (resource_int_value(device_get_name(dev),
		device_get_unit(dev), "sda", &sc->sda_pin))
		sc->sda_pin = SDA_PIN_DEFAULT;

#ifdef FDT
	if ((node = ofw_bus_get_node(dev)) == -1)
		return (ENXIO);
	if (OF_getencprop(node, "scl", &pin, sizeof(pin)) > 0)
		sc->scl_pin = (int)pin;
	if (OF_getencprop(node, "sda", &pin, sizeof(pin)) > 0)
		sc->sda_pin = (int)pin;
#endif

	if (sc->scl_pin < 0 || sc->scl_pin > 1)
		sc->scl_pin = SCL_PIN_DEFAULT;
	if (sc->sda_pin < 0 || sc->sda_pin > 1)
		sc->sda_pin = SDA_PIN_DEFAULT;

	devi = GPIOBUS_IVAR(dev);
	device_printf(dev, "SCL pin: %d, SDA pin: %d\n",
	    devi->pins[sc->scl_pin], devi->pins[sc->sda_pin]);

	/* add generic bit-banging code */
	bitbang = device_add_child(dev, "iicbb", -1);
	device_probe_and_attach(bitbang);

	return (0);
}

static void
obio_hinted_child(device_t bus, const char *dname, int dunit)
{
	long			maddr;
	int			msize;
	int			irq;

	/*
	 * Set hard-wired resources for hinted child using
	 * specific RIDs.
	 */
	resource_long_value(dname, dunit, "maddr", &maddr);
	resource_int_value(dname, dunit, "msize", &msize);


	if (resource_int_value(dname, dunit, "irq", &irq) == 0) irq = -1;

	obio_add_res_child(bus, dname, dunit, maddr, msize, irq);
}

/*
 * Fetch the LED configuration from the boot hints.
 */
static int
ar8327_fetch_pdata_led(struct arswitch_softc *sc,
    struct ar8327_led_cfg *lcfg)
{
	int val;

	val = 0;
	if (resource_int_value(device_get_name(sc->sc_dev),
	    device_get_unit(sc->sc_dev),
	    "led.ctrl0", &val) != 0)
		return (0);
	lcfg->led_ctrl0 = val;

	val = 0;
	if (resource_int_value(device_get_name(sc->sc_dev),
	    device_get_unit(sc->sc_dev),
	    "led.ctrl1", &val) != 0)
		return (0);
	lcfg->led_ctrl1 = val;

	val = 0;
	if (resource_int_value(device_get_name(sc->sc_dev),
	    device_get_unit(sc->sc_dev),
	    "led.ctrl2", &val) != 0)
		return (0);
	lcfg->led_ctrl2 = val;

	val = 0;
	if (resource_int_value(device_get_name(sc->sc_dev),
	    device_get_unit(sc->sc_dev),
	    "led.ctrl3", &val) != 0)
		return (0);
	lcfg->led_ctrl3 = val;

	val = 0;
	if (resource_int_value(device_get_name(sc->sc_dev),
	    device_get_unit(sc->sc_dev),
	    "led.open_drain", &val) != 0)
		return (0);
	lcfg->open_drain = val;

	return (1);
}