static int
acpi_syscont_attach(device_t dev)
{

    bus_generic_probe(dev);
    return (bus_generic_attach(dev));
}

static int
nexus_xen_attach(device_t dev)
{
	int error;
	device_t acpi_dev = NULL;

	nexus_init_resources();
	bus_generic_probe(dev);

	if (xen_initial_domain()) {
		/* Disable some ACPI devices that are not usable by Dom0 */
		acpi_cpu_disabled = true;
		acpi_hpet_disabled = true;
		acpi_timer_disabled = true;

		acpi_dev = BUS_ADD_CHILD(dev, 10, "acpi", 0);
		if (acpi_dev == NULL)
			panic("Unable to add ACPI bus to Xen Dom0");
	}

	error = bus_generic_attach(dev);
	if (xen_initial_domain() && (error == 0))
		acpi_install_wakeup_handler(device_get_softc(acpi_dev));

	return (error);
}

static int
isab_pci_attach(device_t dev)
{

	bus_generic_probe(dev);
	return (isab_attach(dev));
}

int
iodi_attach(device_t dev)
{
	device_t tmpd;
	int i;

	/*
	 * Attach each devices
	 */
	device_add_child(dev, "uart", 0);
	device_add_child(dev, "xlr_i2c", 0);
	device_add_child(dev, "xlr_i2c", 1);
	device_add_child(dev, "pcib", 0);
	device_add_child(dev, "rmisec", -1);

	if (xlr_board_info.usb)
		device_add_child(dev, "ehci", 0);

	if (xlr_board_info.cfi)
		device_add_child(dev, "cfi", 0);

	if (xlr_board_info.ata)
		device_add_child(dev, "ata", 0);

	for (i = 0; i < 3; i++) {
		if (xlr_board_info.gmac_block[i].enabled == 0)
			continue;
		tmpd = device_add_child(dev, "nlna", i);
		device_set_ivars(tmpd, &xlr_board_info.gmac_block[i]);
	}

	bus_generic_probe(dev);
	bus_generic_attach(dev);
	return 0;
}

static int
nexus_attach(device_t dev)
{
	device_t	child;

	/*
	 * First, let our child driver's identify any child devices that
	 * they can find.  Once that is done attach any devices that we
	 * found.
	 */
#if 0 /* FUTURE */
	bus_generic_probe(dev);
#endif
	bus_generic_attach(dev);

	/*
	 * And if we didn't see ISA on a pci bridge, create a
	 * connection point now so it shows up "on motherboard".
	 */
	if (!devclass_get_device(devclass_find("isa"), 0)) {
		child = BUS_ADD_CHILD(dev, dev, 0, "isa", 0);
		if (child == NULL)
			panic("nexus_attach isa");
		device_probe_and_attach(child);
	}

	return 0;
}

static int
acpi_cpu_cst_attach(device_t dev)
{
    ACPI_BUFFER		   buf;
    ACPI_OBJECT		   *obj;
    struct mdglobaldata	  *md;
    struct acpi_cpu_softc *sc;
    ACPI_STATUS		   status;
    int			   cpu_id;

    ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);

    sc = device_get_softc(dev);
    sc->cpu_dev = dev;
    sc->cpu_parent = device_get_softc(device_get_parent(dev));
    sc->cpu_handle = acpi_get_handle(dev);
    cpu_id = acpi_get_magic(dev);
    cpu_softc[cpu_id] = sc;
    md = (struct mdglobaldata *)globaldata_find(device_get_unit(dev));
    sc->md = md;
    cpu_smi_cmd = AcpiGbl_FADT.SmiCommand;
    cpu_cst_cnt = AcpiGbl_FADT.CstControl;

    buf.Pointer = NULL;
    buf.Length = ACPI_ALLOCATE_BUFFER;
    status = AcpiEvaluateObject(sc->cpu_handle, NULL, NULL, &buf);
    if (ACPI_FAILURE(status)) {
	device_printf(dev, "attach failed to get Processor obj - %s\n",
		      AcpiFormatException(status));
	return (ENXIO);
    }
    obj = (ACPI_OBJECT *)buf.Pointer;
    sc->cpu_p_blk = obj->Processor.PblkAddress;
    sc->cpu_p_blk_len = obj->Processor.PblkLength;
    sc->cpu_acpi_id = obj->Processor.ProcId;
    AcpiOsFree(obj);
    ACPI_DEBUG_PRINT((ACPI_DB_INFO, "acpi_cpu%d: P_BLK at %#x/%d\n",
		     device_get_unit(dev), sc->cpu_p_blk, sc->cpu_p_blk_len));

    /*
     * If this is the first cpu we attach, create and initialize the generic
     * resources that will be used by all acpi cpu devices.
     */
    if (device_get_unit(dev) == 0) {
	/* Assume we won't be using generic Cx mode by default */
	cpu_cx_generic = FALSE;

	/* Queue post cpu-probing task handler */
	AcpiOsExecute(OSL_NOTIFY_HANDLER, acpi_cpu_startup, NULL);
    }

    /* Probe for Cx state support. */
    acpi_cpu_cx_probe(sc);

    /* Finally,  call identify and probe/attach for child devices. */
    bus_generic_probe(dev);
    bus_generic_attach(dev);

    return (0);
}

static int
nexus_probe(device_t dev)
{
	bus_generic_probe(dev);
	device_set_desc(dev, "Open Firmware Nexus device");
	return (0);
}

static int
nexus_attach(device_t dev)
{

	mem_rman.rm_start = 0;
	mem_rman.rm_end = BUS_SPACE_MAXADDR;
	mem_rman.rm_type = RMAN_ARRAY;
	mem_rman.rm_descr = "I/O memory addresses";
	if (rman_init(&mem_rman) ||
	    rman_manage_region(&mem_rman, 0, BUS_SPACE_MAXADDR))
		panic("nexus_attach mem_rman");
	irq_rman.rm_start = 0;
	irq_rman.rm_end = ~0;
	irq_rman.rm_type = RMAN_ARRAY;
	irq_rman.rm_descr = "Interrupts";
	if (rman_init(&irq_rman) || rman_manage_region(&irq_rman, 0, ~0))
		panic("nexus_attach irq_rman");

	nexus_add_child(dev, 8, "timer", 0);
	nexus_add_child(dev, 9, "rcons", 0);
	nexus_add_child(dev, 10, "ofwbus", 0);

	bus_generic_probe(dev);
	bus_generic_attach(dev);

	return (0);
}

static int
canbus_attach(device_t dev)
{
	struct canbus_softc *sc = device_get_softc(dev);
	struct sysctl_oid *canbus_sysctl_tree;

	sc->io_delay_time = CANBE_IO_DELAY_TIME;

	/* I/O resource setup */
	if(alloc_ioresource(dev))
		return (ENXIO);

	/* Dynamic sysctl tree setup */
	sysctl_ctx_init(&sc->canbus_sysctl_ctx);
	canbus_sysctl_tree = SYSCTL_ADD_NODE(&sc->canbus_sysctl_ctx,
	    SYSCTL_STATIC_CHILDREN(/* tree top */), OID_AUTO,
	    "canbus", CTLFLAG_RD, 0, "CanBe I/O Bus");
	SYSCTL_ADD_INT(&sc->canbus_sysctl_ctx,
	    SYSCTL_CHILDREN(canbus_sysctl_tree), OID_AUTO, "io_delay_time",
	    CTLFLAG_RW, &sc->io_delay_time, 0, "CanBe Bus I/O delay time");

	bus_generic_probe(dev);
	bus_generic_attach(dev);

	return (0);
}

static int
atkbdc_isa_attach(device_t dev)
{
	atkbdc_softc_t	*sc;
	int		unit;
	int		error;
	int		rid;

	unit = device_get_unit(dev);
	sc = *(atkbdc_softc_t **)device_get_softc(dev);
	if (sc == NULL) {
		/*
		 * We have to maintain two copies of the kbdc_softc struct,
		 * as the low-level console needs to have access to the
		 * keyboard controller before kbdc is probed and attached.
		 * kbdc_soft[] contains the default entry for that purpose.
		 * See atkbdc.c. XXX
		 */
		sc = atkbdc_get_softc(unit);
		if (sc == NULL)
			return ENOMEM;
	}

	rid = 0;
	sc->retry = 5000;
	sc->port0 = bus_alloc_resource_any(dev, SYS_RES_IOPORT, &rid,
					   RF_ACTIVE);
	if (sc->port0 == NULL)
		return ENXIO;
	rid = 1;
	sc->port1 = bus_alloc_resource_any(dev, SYS_RES_IOPORT, &rid,
					   RF_ACTIVE);
	if (sc->port1 == NULL) {
		bus_release_resource(dev, SYS_RES_IOPORT, 0, sc->port0);
		return ENXIO;
	}

	/*
	 * If the device is not created by the PnP BIOS or ACPI, then
	 * the hint for the IRQ is on the child atkbd device, not the
	 * keyboard controller, so this can fail.
	 */
	rid = 0;
	sc->irq = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid, RF_ACTIVE);

	error = atkbdc_attach_unit(unit, sc, sc->port0, sc->port1);
	if (error) {
		bus_release_resource(dev, SYS_RES_IOPORT, 0, sc->port0);
		bus_release_resource(dev, SYS_RES_IOPORT, 1, sc->port1);
		if (sc->irq != NULL)
			bus_release_resource(dev, SYS_RES_IRQ, 0, sc->irq);
		return error;
	}
	*(atkbdc_softc_t **)device_get_softc(dev) = sc;

	bus_generic_probe(dev);
	bus_generic_attach(dev);

	return 0;
}

int
obio_attach(device_t dev)
{
	struct obio_softc *sc = device_get_softc(dev);

	sc->oba_st = MIPS_BUS_SPACE_IO;
	sc->oba_addr = MIPS_PHYS_TO_KSEG1(MALTA_UART0ADR);
	sc->oba_size = MALTA_PCIMEM3_SIZE;
	sc->oba_rman.rm_type = RMAN_ARRAY;
	sc->oba_rman.rm_descr = "OBIO I/O";
	if (rman_init(&sc->oba_rman) != 0 ||
	    rman_manage_region(&sc->oba_rman,
	    sc->oba_addr, sc->oba_addr + sc->oba_size) != 0)
		panic("obio_attach: failed to set up I/O rman");
	sc->oba_irq_rman.rm_type = RMAN_ARRAY;
	sc->oba_irq_rman.rm_descr = "OBIO IRQ";

	/* 
	 * This module is intended for UART purposes only and
	 * it's IRQ is 4
	 */
	if (rman_init(&sc->oba_irq_rman) != 0 ||
	    rman_manage_region(&sc->oba_irq_rman, 4, 4) != 0)
		panic("obio_attach: failed to set up IRQ rman");

	device_add_child(dev, "uart", 0);
	bus_generic_probe(dev);
	bus_generic_attach(dev);

	return (0);
}

static int
obio_attach(device_t dev)
{
	struct obio_softc *sc = device_get_softc(dev);
	int rid;

	sc->oba_mem_rman.rm_type = RMAN_ARRAY;
	sc->oba_mem_rman.rm_descr = "OBIO memeory";
	if (rman_init(&sc->oba_mem_rman) != 0 ||
	    rman_manage_region(&sc->oba_mem_rman, OBIO_MEM_START,
	        OBIO_MEM_START + OBIO_MEM_SIZE) != 0)
		panic("obio_attach: failed to set up I/O rman");

	sc->oba_irq_rman.rm_type = RMAN_ARRAY;
	sc->oba_irq_rman.rm_descr = "OBIO IRQ";

	if (rman_init(&sc->oba_irq_rman) != 0 ||
	    rman_manage_region(&sc->oba_irq_rman, 0, NIRQS-1) != 0)
		panic("obio_attach: failed to set up IRQ rman");

	/* Hook up our interrupt handler. */
	if ((sc->sc_irq = bus_alloc_resource(dev, SYS_RES_IRQ, &rid,
	    ADM5120_INTR, ADM5120_INTR, 1,
	    RF_SHAREABLE | RF_ACTIVE)) == NULL) {
		device_printf(dev, "unable to allocate IRQ resource\n");
		return (ENXIO);
	}

	if ((bus_setup_intr(dev, sc->sc_irq, INTR_TYPE_MISC, obio_intr, NULL,
	    sc, &sc->sc_ih))) {
		device_printf(dev,
		    "WARNING: unable to register interrupt handler\n");
		return (ENXIO);
	}

	/* Hook up our FAST interrupt handler. */
	if ((sc->sc_fast_irq = bus_alloc_resource(dev, SYS_RES_IRQ, &rid,
	    ADM5120_FAST_INTR, ADM5120_FAST_INTR, 1,
	    RF_SHAREABLE | RF_ACTIVE)) == NULL) {
		device_printf(dev, "unable to allocate IRQ resource\n");
		return (ENXIO);
	}

	if ((bus_setup_intr(dev, sc->sc_fast_irq, INTR_TYPE_MISC, obio_intr,
	    NULL, sc, &sc->sc_fast_ih))) {
		device_printf(dev,
		    "WARNING: unable to register interrupt handler\n");
		return (ENXIO);
	}

	/* disable all interrupts */
	REG_WRITE(ICU_ENABLE_REG, ICU_INT_MASK);

	bus_generic_probe(dev);
	bus_enumerate_hinted_children(dev);
	bus_generic_attach(dev);

	return (0);
}

static int
ixp425_attach(device_t dev)
{
	struct ixp425_softc *sc;

	device_printf(dev, "%b\n", ixp4xx_read_feature_bits(), EXP_FCTRL_BITS);

	sc = device_get_softc(dev);
	sc->sc_iot = &ixp425_bs_tag;
	KASSERT(ixp425_softc == NULL, ("%s called twice?", __func__));
	ixp425_softc = sc;

	intr_enabled = 0;
	ixp425_set_intrmask();
	ixp425_set_intrsteer();
	if (cpu_is_ixp43x()) {
		intr_enabled2 = 0;
		ixp435_set_intrmask();
		ixp435_set_intrsteer();
	}

	if (bus_dma_tag_create(NULL, 1, 0, BUS_SPACE_MAXADDR_32BIT,
	    BUS_SPACE_MAXADDR, NULL, NULL,  0xffffffff, 0xff, 0xffffffff, 0, 
	    NULL, NULL, &sc->sc_dmat))
		panic("%s: failed to create dma tag", __func__);

	sc->sc_irq_rman.rm_type = RMAN_ARRAY;
	sc->sc_irq_rman.rm_descr = "IXP4XX IRQs";
	if (rman_init(&sc->sc_irq_rman) != 0 ||
	    rman_manage_region(&sc->sc_irq_rman, 0, cpu_is_ixp43x() ? 63 : 31) != 0)
		panic("%s: failed to set up IRQ rman", __func__);

	sc->sc_mem_rman.rm_type = RMAN_ARRAY;
	sc->sc_mem_rman.rm_descr = "IXP4XX Memory";
	if (rman_init(&sc->sc_mem_rman) != 0 ||
	    rman_manage_region(&sc->sc_mem_rman, 0, ~0) != 0)
		panic("%s: failed to set up memory rman", __func__);

	BUS_ADD_CHILD(dev, 0, "pcib", 0);
	BUS_ADD_CHILD(dev, 0, "ixpclk", 0);
	BUS_ADD_CHILD(dev, 0, "ixpiic", 0);
	/* XXX move to hints? */
	BUS_ADD_CHILD(dev, 0, "ixpwdog", 0);

	/* attach wired devices via hints */
	bus_enumerate_hinted_children(dev);

	if (bus_space_map(sc->sc_iot, IXP425_GPIO_HWBASE, IXP425_GPIO_SIZE,
	    0, &sc->sc_gpio_ioh))
		panic("%s: unable to map GPIO registers", __func__);
	if (bus_space_map(sc->sc_iot, IXP425_EXP_HWBASE, IXP425_EXP_SIZE,
	    0, &sc->sc_exp_ioh))
		panic("%s: unable to map Expansion Bus registers", __func__);

	bus_generic_probe(dev);
	bus_generic_attach(dev);

	return (0);
}

static int
ofw_spibus_attach(device_t dev)
{
	struct spibus_softc *sc = device_get_softc(dev);
	struct ofw_spibus_devinfo *dinfo;
	phandle_t child;
	pcell_t clock, paddr;
	device_t childdev;

	sc->dev = dev;

	bus_generic_probe(dev);
	bus_enumerate_hinted_children(dev);

	/*
	 * Attach those children represented in the device tree.
	 */
	for (child = OF_child(ofw_bus_get_node(dev)); child != 0;
	    child = OF_peer(child)) {
		/*
		 * Try to get the CS number first from the spi-chipselect
		 * property, then try the reg property.
		 */
		if (OF_getencprop(child, "spi-chipselect", &paddr,
		    sizeof(paddr)) == -1) {
			if (OF_getencprop(child, "reg", &paddr,
			    sizeof(paddr)) == -1)
				continue;
		}

		/*
		 * Get the maximum clock frequency for device, zero means
		 * use the default bus speed.
		 */
		if (OF_getencprop(child, "spi-max-frequency", &clock,
		    sizeof(clock)) == -1)
			clock = 0;

		/*
		 * Now set up the SPI and OFW bus layer devinfo and add it
		 * to the bus.
		 */
		dinfo = malloc(sizeof(struct ofw_spibus_devinfo), M_DEVBUF,
		    M_NOWAIT | M_ZERO);
		if (dinfo == NULL)
			continue;
		dinfo->opd_dinfo.cs = paddr;
		dinfo->opd_dinfo.clock = clock;
		if (ofw_bus_gen_setup_devinfo(&dinfo->opd_obdinfo, child) !=
		    0) {
			free(dinfo, M_DEVBUF);
			continue;
		}
		childdev = device_add_child(dev, NULL, -1);
		device_set_ivars(childdev, dinfo);
	}

	return (bus_generic_attach(dev));
}

static int
smbus_attach(device_t dev)
{
	bus_generic_probe(dev);
	bus_generic_attach(dev);

	return (0);
}

static int
mdio_attach(device_t dev)
{

	bus_generic_probe(dev);
	bus_enumerate_hinted_children(dev);
	return (bus_generic_attach(dev));
}

static int
nexus_attach(device_t dev)
{

	bus_generic_probe(dev);
	bus_generic_attach(dev);
	return 0;
}

static int
ofwbus_attach(device_t dev)
{
	struct ofwbus_devinfo *ndi;
	struct ofwbus_softc *sc;
	device_t cdev;
	phandle_t node;

	sc = device_get_softc(dev);

	node = OF_peer(0);

	/*
	 * If no Open Firmware, bail early
	 */
	if (node == -1)
		return (ENXIO);

	sc->sc_intr_rman.rm_type = RMAN_ARRAY;
	sc->sc_intr_rman.rm_descr = "Interrupts";
	sc->sc_mem_rman.rm_type = RMAN_ARRAY;
	sc->sc_mem_rman.rm_descr = "Device Memory";
	if (rman_init(&sc->sc_intr_rman) != 0 ||
	    rman_init(&sc->sc_mem_rman) != 0 ||
	    rman_manage_region(&sc->sc_intr_rman, 0, ~0) != 0 ||
	    rman_manage_region(&sc->sc_mem_rman, 0, BUS_SPACE_MAXADDR) != 0)
		panic("%s: failed to set up rmans.", __func__);

	/*
	 * Allow devices to identify.
	 */
	bus_generic_probe(dev);

	/*
	 * Some important numbers
	 */
	sc->acells = 2;
	OF_getencprop(node, "#address-cells", &sc->acells, sizeof(sc->acells));
	sc->scells = 1;
	OF_getencprop(node, "#size-cells", &sc->scells, sizeof(sc->scells));

	/*
	 * Now walk the OFW tree and attach top-level devices.
	 */
	for (node = OF_child(node); node > 0; node = OF_peer(node)) {
		if ((ndi = ofwbus_setup_dinfo(dev, node)) == NULL)
			continue;
		cdev = device_add_child(dev, NULL, -1);
		if (cdev == NULL) {
			device_printf(dev, "<%s>: device_add_child failed\n",
			    ndi->ndi_obdinfo.obd_name);
			ofwbus_destroy_dinfo(ndi);
			continue;
		}
		device_set_ivars(cdev, ndi);
	}
	return (bus_generic_attach(dev));
}

static int
nexus_probe(device_t dev)
{
	int cpuid;

	device_quiet(dev);	/* suppress attach message for neatness */

	for (cpuid = 0; cpuid < ncpus; ++cpuid) {
		struct rman *rm = &irq_rman[cpuid];

		rm->rm_start = 0;
		rm->rm_end = IDT_HWI_VECTORS - 1;
		rm->rm_type = RMAN_ARRAY;
		rm->rm_descr = "Interrupt request lines";

		if (rman_init(rm, cpuid))
			panic("nexus_probe rman_init");
		MachIntrABI.rman_setup(rm);
	}

	/*
	 * ISA DMA on PCI systems is implemented in the ISA part of each
	 * PCI->ISA bridge and the channels can be duplicated if there are
	 * multiple bridges.  (eg: laptops with docking stations)
	 */
	drq_rman.rm_start = 0;
	drq_rman.rm_end = 7;
	drq_rman.rm_type = RMAN_ARRAY;
	drq_rman.rm_descr = "DMA request lines";
	/* XXX drq 0 not available on some machines */
	if (rman_init(&drq_rman, -1)
	    || rman_manage_region(&drq_rman,
				  drq_rman.rm_start, drq_rman.rm_end))
		panic("nexus_probe drq_rman");

	/*
	 * However, IO ports and Memory truely are global at this level,
	 * as are APIC interrupts (however many IO APICS there turn out
	 * to be on large systems..)
	 */
	port_rman.rm_start = 0;
	port_rman.rm_end = 0xffff;
	port_rman.rm_type = RMAN_ARRAY;
	port_rman.rm_descr = "I/O ports";
	if (rman_init(&port_rman, -1)
	    || rman_manage_region(&port_rman, 0, 0xffff))
		panic("nexus_probe port_rman");

	mem_rman.rm_start = 0;
	mem_rman.rm_end = ~0u;
	mem_rman.rm_type = RMAN_ARRAY;
	mem_rman.rm_descr = "I/O memory addresses";
	if (rman_init(&mem_rman, -1)
	    || rman_manage_region(&mem_rman, 0, ~0))
		panic("nexus_probe mem_rman");

	return bus_generic_probe(dev);
}

int
ata_identify(device_t dev)
{
    struct ata_channel *ch = device_get_softc(dev);
    struct ata_device *master = NULL, *slave = NULL;
    device_t master_child = NULL, slave_child = NULL;
    int master_unit = -1, slave_unit = -1;

    if (ch->devices & (ATA_ATA_MASTER | ATA_ATAPI_MASTER)) {
	if (!(master = malloc(sizeof(struct ata_device),
			      M_ATA, M_NOWAIT | M_ZERO))) {
	    device_printf(dev, "out of memory\n");
	    return ENOMEM;
	}
	master->unit = ATA_MASTER;
    }
    if (ch->devices & (ATA_ATA_SLAVE | ATA_ATAPI_SLAVE)) {
	if (!(slave = malloc(sizeof(struct ata_device),
			     M_ATA, M_NOWAIT | M_ZERO))) {
	    free(master, M_ATA);
	    device_printf(dev, "out of memory\n");
	    return ENOMEM;
	}
	slave->unit = ATA_SLAVE;
    }

#ifdef ATA_STATIC_ID
    if (ch->devices & ATA_ATA_MASTER)
	master_unit = (device_get_unit(dev) << 1);
#endif
    if (master && !(master_child = ata_add_child(dev, master, master_unit))) {
	free(master, M_ATA);
	master = NULL;
    }
#ifdef ATA_STATIC_ID
    if (ch->devices & ATA_ATA_SLAVE)
	slave_unit = (device_get_unit(dev) << 1) + 1;
#endif
    if (slave && !(slave_child = ata_add_child(dev, slave, slave_unit))) {
	free(slave, M_ATA);
	slave = NULL;
    }

    if (slave && ata_getparam(slave, 1)) {
	device_delete_child(dev, slave_child);
	free(slave, M_ATA);
    }
    if (master && ata_getparam(master, 1)) {
	device_delete_child(dev, master_child);
	free(master, M_ATA);
    }

    bus_generic_probe(dev);
    bus_generic_attach(dev);
    return 0;
}