void __init 
locate_and_init_vga(void *(*sel_func)(void *, void *))
{
	struct pci_controller *hose = NULL;
	struct pci_dev *dev = NULL;

	/*                             */
	if (!sel_func) sel_func = (void *)default_vga_hose_select;

	/*                             */
	for(dev=NULL; (dev=pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, dev));) {
		if (!hose)
			hose = dev->sysdata;
		else
			hose = sel_func(hose, dev->sysdata);
	}

	/*                                                          */
	if (!hose || (conswitchp == &vga_con && pci_vga_hose == hose))
		return;

	/*                                                         */
	alpha_vga.start += hose->io_space->start;
	alpha_vga.end += hose->io_space->start;
	request_resource(hose->io_space, &alpha_vga);

	/*                                            */
	pci_vga_hose = hose;
	take_over_console(&vga_con, 0, MAX_NR_CONSOLES-1, 1);
}

void intel_detect_pch(struct drm_device *dev)
{
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct pci_dev *pch;

	pch = pci_get_class(PCI_CLASS_BRIDGE_ISA << 8, NULL);
	if (pch) {
		if (pch->vendor == PCI_VENDOR_ID_INTEL) {
			int id;
			id = pch->device & INTEL_PCH_DEVICE_ID_MASK;

			if (id == INTEL_PCH_IBX_DEVICE_ID_TYPE) {
				dev_priv->pch_type = PCH_IBX;
				DRM_DEBUG_KMS("Found Ibex Peak PCH\n");
			} else if (id == INTEL_PCH_CPT_DEVICE_ID_TYPE) {
				dev_priv->pch_type = PCH_CPT;
				DRM_DEBUG_KMS("Found CougarPoint PCH\n");
			} else if (id == INTEL_PCH_PPT_DEVICE_ID_TYPE) {
				
				dev_priv->pch_type = PCH_CPT;
				DRM_DEBUG_KMS("Found PatherPoint PCH\n");
			}
		}
		pci_dev_put(pch);
	}
}

void intel_detect_pch(struct drm_device *dev)
{
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct pci_dev *pch;

	/* In all current cases, num_pipes is equivalent to the PCH_NOP setting
	 * (which really amounts to a PCH but no South Display).
	 */
	if (INTEL_INFO(dev)->num_pipes == 0) {
		dev_priv->pch_type = PCH_NOP;
		return;
	}

	/*
	 * The reason to probe ISA bridge instead of Dev31:Fun0 is to
	 * make graphics device passthrough work easy for VMM, that only
	 * need to expose ISA bridge to let driver know the real hardware
	 * underneath. This is a requirement from virtualization team.
	 *
	 * In some virtualized environments (e.g. XEN), there is irrelevant
	 * ISA bridge in the system. To work reliably, we should scan trhough
	 * all the ISA bridge devices and check for the first match, instead
	 * of only checking the first one.
	 */
	pch = pci_get_class(PCI_CLASS_BRIDGE_ISA << 8, NULL);
	while (pch) {
		struct pci_dev *curr = pch;
		if (pch->vendor == PCI_VENDOR_ID_INTEL) {
			unsigned short id;
			id = pch->device & INTEL_PCH_DEVICE_ID_MASK;
			dev_priv->pch_id = id;

			if (id == INTEL_PCH_IBX_DEVICE_ID_TYPE) {
				dev_priv->pch_type = PCH_IBX;
				DRM_DEBUG_KMS("F

static int
cbb_pci_probe(device_t brdev)
{
	const char *name;
	uint32_t progif;
	uint32_t baseclass;
	uint32_t subclass;

	/*
	 * Do we know that we support the chipset?  If so, then we
	 * accept the device.
	 */
	if (cbb_chipset(pci_get_devid(brdev), &name) != CB_UNKNOWN) {
		device_set_desc(brdev, name);
		return (BUS_PROBE_DEFAULT);
	}

	/*
	 * We do support generic CardBus bridges.  All that we've seen
	 * to date have progif 0 (the Yenta spec, and successors mandate
	 * this).
	 */
	baseclass = pci_get_class(brdev);
	subclass = pci_get_subclass(brdev);
	progif = pci_get_progif(brdev);
	if (baseclass == PCIC_BRIDGE &&
	    subclass == PCIS_BRIDGE_CARDBUS && progif == 0) {
		device_set_desc(brdev, "PCI-CardBus Bridge");
		return (BUS_PROBE_GENERIC);
	}
	return (ENXIO);
}

static const char *
xhci_pci_match(device_t self)
{
	uint32_t device_id = pci_get_devid(self);

	switch (device_id) {
	case 0x01941033:
		return ("NEC uPD720200 USB 3.0 controller");

	case 0x1e318086:
		return ("Intel Panther Point USB 3.0 controller");
	case 0x8c318086:
		return ("Intel Lynx Point USB 3.0 controller");

	default:
		break;
	}

	if ((pci_get_class(self) == PCIC_SERIALBUS)
	    && (pci_get_subclass(self) == PCIS_SERIALBUS_USB)
	    && (pci_get_progif(self) == PCIP_SERIALBUS_USB_XHCI)) {
		return ("XHCI (generic) USB 3.0 controller");
	}
	return (NULL);			/* dunno */
}

void __init 
locate_and_init_vga(void *(*sel_func)(void *, void *))
{
	struct pci_controller *hose = NULL;
	struct pci_dev *dev = NULL;

	/* Default the select function */
	if (!sel_func) sel_func = (void *)default_vga_hose_select;

	/* Find the console VGA device */
	for(dev=NULL; (dev=pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, dev));) {
		if (!hose)
			hose = dev->sysdata;
		else
			hose = sel_func(hose, dev->sysdata);
	}

	/* Did we already initialize the correct one? Is there one? */
	if (!hose || (conswitchp == &vga_con && pci_vga_hose == hose))
		return;

	/* Create a new VGA ioport resource WRT the hose it is on. */
	alpha_vga.start += hose->io_space->start;
	alpha_vga.end += hose->io_space->start;
	request_resource(hose->io_space, &alpha_vga);

	/* Set the VGA hose and init the new console. */
	pci_vga_hose = hose;
	console_lock();
	do_take_over_console(&vga_con, 0, MAX_NR_CONSOLES-1, 1);
	console_unlock();
}

static int
nvme_probe (device_t device)
{
	struct _pcsid	*ep;
	uint32_t	devid;
	uint16_t	subdevice;

	devid = pci_get_devid(device);
	subdevice = pci_get_subdevice(device);
	ep = pci_ids;

	while (ep->devid) {
		if (nvme_match(devid, subdevice, ep))
			break;
		++ep;
	}

	if (ep->desc) {
		device_set_desc(device, ep->desc);
		return (BUS_PROBE_DEFAULT);
	}

#if defined(PCIS_STORAGE_NVM)
	if (pci_get_class(device)    == PCIC_STORAGE &&
	    pci_get_subclass(device) == PCIS_STORAGE_NVM &&
	    pci_get_progif(device)   == PCIP_STORAGE_NVM_ENTERPRISE_NVMHCI_1_0) {
		device_set_desc(device, "Generic NVMe Device");
		return (BUS_PROBE_GENERIC);
	}
#endif

	return (ENXIO);
}

/*
 * Provide a device to "eat" the host->pci bridge devices that show up
 * on PCI busses and stop them showing up twice on the probes.  This also
 * stops them showing up as 'none' in pciconf -l.  If the host bridge
 * provides an AGP capability then we create a child agp device for the
 * agp GART driver to attach to.
 */
static int
pci_hostb_probe(device_t dev)
{
	u_int32_t id;

	id = pci_get_devid(dev);

	switch (id) {

	/* VIA VT82C596 Power Managment Function */
	case 0x30501106:
		return (ENXIO);

	default:
		break;
	}

	if (pci_get_class(dev) == PCIC_BRIDGE &&
	    pci_get_subclass(dev) == PCIS_BRIDGE_HOST) {
		device_set_desc(dev, "Host to PCI bridge");
		device_quiet(dev);
		return (-10000);
	}
	return (ENXIO);
}

static int
nvme_probe (device_t device)
{
	struct _pcsid	*ep;
	u_int32_t	type;

	type = pci_get_devid(device);
	ep = pci_ids;

	while (ep->type && ep->type != type)
		++ep;

	if (ep->desc) {
		device_set_desc(device, ep->desc);
		return (BUS_PROBE_DEFAULT);
	}

#if defined(PCIS_STORAGE_NVM)
	if (pci_get_class(device)    == PCIC_STORAGE &&
	    pci_get_subclass(device) == PCIS_STORAGE_NVM &&
	    pci_get_progif(device)   == PCIP_STORAGE_NVM_ENTERPRISE_NVMHCI_1_0) {
		device_set_desc(device, "Generic NVMe Device");
		return (BUS_PROBE_GENERIC);
	}
#endif

	return (ENXIO);
}

/*  Returns non-zero if we have the write-combining memory type  */
static int have_wrcomb(void)
{
	struct pci_dev *dev;

	dev = pci_get_class(PCI_CLASS_BRIDGE_HOST << 8, NULL);
	if (dev != NULL) {
		/*
		 * ServerWorks LE chipsets < rev 6 have problems with
		 * write-combining. Don't allow it and leave room for other
		 * chipsets to be tagged
		 */
		if (dev->vendor == PCI_VENDOR_ID_SERVERWORKS &&
		    dev->device == PCI_DEVICE_ID_SERVERWORKS_LE &&
		    dev->revision <= 5) {
			pr_info("mtrr: Serverworks LE rev < 6 detected. Write-combining disabled.\n");
			pci_dev_put(dev);
			return 0;
		}
		/*
		 * Intel 450NX errata # 23. Non ascending cacheline evictions to
		 * write combining memory may resulting in data corruption
		 */
		if (dev->vendor == PCI_VENDOR_ID_INTEL &&
		    dev->device == PCI_DEVICE_ID_INTEL_82451NX) {
			pr_info("mtrr: Intel 450NX MMC detected. Write-combining disabled.\n");
			pci_dev_put(dev);
			return 0;
		}
		pci_dev_put(dev);
	}
	return mtrr_if->have_wrcomb ? mtrr_if->have_wrcomb() : 0;
}

static const char *
ohci_pci_match(device_t self)
{
	u_int32_t device_id = pci_get_devid(self);

	switch(device_id) {
	case PCI_OHCI_DEVICEID_ALADDIN_V:
		return (ohci_device_aladdin_v);
	case PCI_OHCI_DEVICEID_AMD756:
		return (ohci_device_amd756);
	case PCI_OHCI_DEVICEID_USB0670:
		return (ohci_device_usb0670);
	case PCI_OHCI_DEVICEID_USB0673:
		return (ohci_device_usb0673);
	case PCI_OHCI_DEVICEID_FIRELINK:
		return (ohci_device_firelink);
	case PCI_OHCI_DEVICEID_NEC:
		return (ohci_device_nec);
	default:
		if (   pci_get_class(self)    == PCIC_SERIALBUS
		    && pci_get_subclass(self) == PCIS_SERIALBUS_USB
		    && pci_get_progif(self)   == PCI_INTERFACE_OHCI) {
			return (ohci_device_generic);
		}
	}

	return NULL;	/* dunno */
}

static int
eisab_probe(device_t dev)
{
    int		matched = 0;

    /*
     * Generic match by class/subclass.
     */
    if ((pci_get_class(dev) == PCIC_BRIDGE) &&
	(pci_get_subclass(dev) == PCIS_BRIDGE_EISA))
	matched = 1;

    /*
     * Some bridges don't correctly report their class.
     */
    switch (pci_get_devid(dev)) {
    case 0x04828086:		/* may show up as PCI-HOST or 0:0 */
	matched = 1;
	break;
    default:
	break;
    }
    
    if (matched) {
	device_set_desc(dev, "PCI-EISA bridge");
	return(-10000);
    }
    return(ENXIO);
}

void intel_detect_pch (struct drm_device *dev)
{
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct pci_dev *pch;

	/*
	 * The reason to probe ISA bridge instead of Dev31:Fun0 is to
	 * make graphics device passthrough work easy for VMM, that only
	 * need to expose ISA bridge to let driver know the real hardware
	 * underneath. This is a requirement from virtualization team.
	 */
	pch = pci_get_class(PCI_CLASS_BRIDGE_ISA << 8, NULL);
	if (pch) {
		if (pch->vendor == PCI_VENDOR_ID_INTEL) {
			int id;
			id = pch->device & INTEL_PCH_DEVICE_ID_MASK;

			if (id == INTEL_PCH_IBX_DEVICE_ID_TYPE) {
				dev_priv->pch_type = PCH_IBX;
				DRM_DEBUG_KMS("Found Ibex Peak PCH\n");
			} else if (id == INTEL_PCH_CPT_DEVICE_ID_TYPE) {
				dev_priv->pch_type = PCH_CPT;
				DRM_DEBUG_KMS("Found CougarPoint PCH\n");
			} else if (id == INTEL_PCH_PPT_DEVICE_ID_TYPE) {
				/* PantherPoint is CPT compatible */
				dev_priv->pch_type = PCH_CPT;
				DRM_DEBUG_KMS("Found PatherPoint PCH\n");
			}
		}
		pci_dev_put(pch);
	}
}

/*  Returns non-zero if we have the write-combining memory type  */
static int have_wrcomb(void)
{
	struct pci_dev *dev;
	u8 rev;
	
	if ((dev = pci_get_class(PCI_CLASS_BRIDGE_HOST << 8, NULL)) != NULL) {
		/* ServerWorks LE chipsets < rev 6 have problems with write-combining
		   Don't allow it and leave room for other chipsets to be tagged */
		if (dev->vendor == PCI_VENDOR_ID_SERVERWORKS &&
		    dev->device == PCI_DEVICE_ID_SERVERWORKS_LE) {
			pci_read_config_byte(dev, PCI_CLASS_REVISION, &rev);
			if (rev <= 5) {
				printk(KERN_INFO "mtrr: Serverworks LE rev < 6 detected. Write-combining disabled.\n");
				pci_dev_put(dev);
				return 0;
			}
		}
		/* Intel 450NX errata # 23. Non ascending cacheline evictions to
		   write combining memory may resulting in data corruption */
		if (dev->vendor == PCI_VENDOR_ID_INTEL &&
		    dev->device == PCI_DEVICE_ID_INTEL_82451NX) {
			printk(KERN_INFO "mtrr: Intel 450NX MMC detected. Write-combining disabled.\n");
			pci_dev_put(dev);
			return 0;
		}
		pci_dev_put(dev);
	}		
	return (mtrr_if->have_wrcomb ? mtrr_if->have_wrcomb() : 0);
}

/*
 * drm_probe_helper: called by a driver at the end of its probe
 * method.
 */
int
drm_probe_helper(device_t kdev, drm_pci_id_list_t *idlist)
{
	drm_pci_id_list_t *id_entry;
	int vendor, device;

	vendor = pci_get_vendor(kdev);
	device = pci_get_device(kdev);

	if (pci_get_class(kdev) != PCIC_DISPLAY ||
	    (pci_get_subclass(kdev) != PCIS_DISPLAY_VGA &&
	     pci_get_subclass(kdev) != PCIS_DISPLAY_OTHER))
		return (-ENXIO);

	id_entry = drm_find_description(vendor, device, idlist);
	if (id_entry != NULL) {
		if (device_get_desc(kdev) == NULL) {
			DRM_DEBUG("%s desc: %s\n",
			    device_get_nameunit(kdev), id_entry->name);
			device_set_desc(kdev, id_entry->name);
		}
		return (0);
	}

	return (-ENXIO);
}

/*
 * XXX we need to add a quirk list here for bridges that don't correctly
 *     report themselves.
 */
static int
isab_pci_probe(device_t dev)
{
    int		matched = 0;

    /*
     * Try for a generic match based on class/subclass.
     */
    if ((pci_get_class(dev) == PCIC_BRIDGE) &&
	(pci_get_subclass(dev) == PCIS_BRIDGE_ISA)) {
	matched = 1;
    } else {
	/*
	 * These are devices that we *know* are PCI:ISA bridges. 
	 * Sometimes, however, they don't report themselves as
	 * such.  Check in case one of them is pretending to be
	 * something else.
	 */
	switch (pci_get_devid(dev)) {
	case 0x04848086:	/* Intel 82378ZB/82378IB */
	case 0x122e8086:	/* Intel 82371FB */
	case 0x70008086:	/* Intel 82371SB */
	case 0x71108086:	/* Intel 82371AB */
	case 0x71988086:	/* Intel 82443MX */
	case 0x24108086:	/* Intel 82801AA (ICH) */
	case 0x24208086:	/* Intel 82801AB (ICH0) */
	case 0x24408086:	/* Intel 82801AB (ICH2) */
	case 0x00061004:	/* VLSI 82C593 */
	case 0x05861106:	/* VIA 82C586 */
	case 0x05961106:	/* VIA 82C596 */
	case 0x06861106:	/* VIA 82C686 */
	case 0x153310b9:	/* AcerLabs M1533 */
	case 0x154310b9:	/* AcerLabs M1543 */
	case 0x00081039:	/* SiS 85c503 */
	case 0x00001078:	/* Cyrix Cx5510 */
	case 0x01001078:	/* Cyrix Cx5530 */
	case 0xc7001045:	/* OPTi 82C700 (FireStar) */
	case 0x00011033:	/* NEC 0001 (C-bus) */
	case 0x002c1033:	/* NEC 002C (C-bus) */
	case 0x003b1033:	/* NEC 003B (C-bus) */
	case 0x886a1060:	/* UMC UM8886 ISA */
	case 0x02001166:	/* ServerWorks IB6566 PCI */
	    if (bootverbose)
		printf("PCI-ISA bridge with incorrect subclass 0x%x\n",
		       pci_get_subclass(dev));
	    matched = 1;
	    break;
	
	default:
	    break;
	}
    }

    if (matched) {
	device_set_desc(dev, "PCI-ISA bridge");
	return(-10000);
    }
    return(ENXIO);
}

static const char *
ohci_pci_match(device_t self)
{
	uint32_t device_id = pci_get_devid(self);

	switch (device_id) {
	case 0x523710b9:
		return ("AcerLabs M5237 (Aladdin-V) USB controller");

	case 0x740c1022:
		return ("AMD-756 USB Controller");

	case 0x74141022:
		return ("AMD-766 USB Controller");

	case 0x43741002:
		return "ATI SB400 USB Controller";
	case 0x43751002:
		return "ATI SB400 USB Controller";

	case 0x06701095:
		return ("CMD Tech 670 (USB0670) USB controller");

	case 0x06731095:
		return ("CMD Tech 673 (USB0673) USB controller");

	case 0xc8611045:
		return ("OPTi 82C861 (FireLink) USB controller");

	case 0x00351033:
		return ("NEC uPD 9210 USB controller");

	case 0x00d710de:
		return ("nVidia nForce3 USB Controller");

	case 0x03f110de:
		return ("nVidia nForce MCP61 USB Controller");

	case 0x70011039:
		return ("SiS 5571 USB controller");

	case 0x1103108e:
		return "Sun PCIO-2 USB controller";

	case 0x0019106b:
		return ("Apple KeyLargo USB controller");

	default:
		break;
	}
	if ((pci_get_class(self) == PCIC_SERIALBUS) &&
	    (pci_get_subclass(self) == PCIS_SERIALBUS_USB) &&
	    (pci_get_progif(self) == PCI_INTERFACE_OHCI)) {
		return ("OHCI (generic) USB controller");
	}
	return (NULL);
}

/*
 * generic PCI ATA device probe
 */
static int
hv_ata_pci_probe(device_t dev)
{
	int ata_disk_enable = 0;
	if(bootverbose)
		device_printf(dev,
		    "hv_ata_pci_probe dev_class/subslcass = %d, %d\n",
			pci_get_class(dev), pci_get_subclass(dev));
			
	/* is this a storage class device ? */
	if (pci_get_class(dev) != PCIC_STORAGE)
		return (ENXIO);

	/* is this an IDE/ATA type device ? */
	if (pci_get_subclass(dev) != PCIS_STORAGE_IDE)
		return (ENXIO);

	if(bootverbose)
		device_printf(dev,
		    "Hyper-V probe for disabling ATA-PCI, emulated driver\n");

	/*
	 * On Hyper-V the default is to use the enlightened driver for
	 * IDE disks. However, if the user wishes to use the native
	 * ATA driver, the environment variable
	 * hw_ata.disk_enable must be explicitly set to 1.
	 */
	if (hv_check_for_hyper_v()) {
		if (getenv_int("hw.ata.disk_enable", &ata_disk_enable)) {
			if(bootverbose)
				device_printf(dev,
				"hw.ata.disk_enable flag is disabling Hyper-V"
				" ATA driver support\n");
			return (ENXIO);
		}

	}

	if(bootverbose)
		device_printf(dev, "Hyper-V ATA storage driver enabled.\n");

	return (BUS_PROBE_VENDOR);
}

/*
 * Generic device interface
 */
static int
pcib_probe(device_t dev)
{
    if ((pci_get_class(dev) == PCIC_BRIDGE) &&
	(pci_get_subclass(dev) == PCIS_BRIDGE_PCI)) {
	device_set_desc(dev, "PCI-PCI bridge");
	return(-10000);
    }
    return(ENXIO);
}

static const char *
xhci_pci_match(device_t self)
{
    if ((pci_get_class(self) == PCIC_SERIALBUS)
            && (pci_get_subclass(self) == PCIS_SERIALBUS_USB)
            && (pci_get_progif(self) == PCIP_SERIALBUS_USB_XHCI)) {
        return ("XHCI (generic) USB 3.0 controller");
    }
    return (NULL);			/* dunno */
}