hw/pci-host/q35.c - qemu - Git at Google

 /*
  * QEMU MCH/ICH9 PCI Bridge Emulation
  *
  * Copyright (c) 2006 Fabrice Bellard
  * Copyright (c) 2009, 2010, 2011
  *               Isaku Yamahata <yamahata at valinux co jp>
  *               VA Linux Systems Japan K.K.
  * Copyright (C) 2012 Jason Baron <jbaron@redhat.com>
  *
  * This is based on piix_pci.c, but heavily modified.
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal
  * in the Software without restriction, including without limitation the rights
  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  * copies of the Software, and to permit persons to whom the Software is
  * furnished to do so, subject to the following conditions:
  *
  * The above copyright notice and this permission notice shall be included in
  * all copies or substantial portions of the Software.
  *
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  * THE SOFTWARE.
  */
 #include "hw/hw.h"
 #include "hw/pci-host/q35.h"
 #include "qapi/visitor.h"

 /****************************************************************************
  * Q35 host
  */

 static void q35_host_realize(DeviceState *dev, Error **errp)
 {
     PCIHostState *pci = PCI_HOST_BRIDGE(dev);
     Q35PCIHost *s = Q35_HOST_DEVICE(dev);
     SysBusDevice *sbd = SYS_BUS_DEVICE(dev);

     sysbus_add_io(sbd, MCH_HOST_BRIDGE_CONFIG_ADDR, &pci->conf_mem);
     sysbus_init_ioports(sbd, MCH_HOST_BRIDGE_CONFIG_ADDR, 4);

     sysbus_add_io(sbd, MCH_HOST_BRIDGE_CONFIG_DATA, &pci->data_mem);
     sysbus_init_ioports(sbd, MCH_HOST_BRIDGE_CONFIG_DATA, 4);

     pci->bus = pci_bus_new(DEVICE(s), "pcie.0",
                            s->mch.pci_address_space, s->mch.address_space_io,
                            0, TYPE_PCIE_BUS);
     qdev_set_parent_bus(DEVICE(&s->mch), BUS(pci->bus));
     qdev_init_nofail(DEVICE(&s->mch));
 }

 static const char *q35_host_root_bus_path(PCIHostState *host_bridge,
                                           PCIBus *rootbus)
 {
     Q35PCIHost *s = Q35_HOST_DEVICE(host_bridge);

      /* For backwards compat with old device paths */
     if (s->mch.short_root_bus) {
         return "0000";
     }
     return "0000:00";
 }

 static void q35_host_get_pci_hole_start(Object *obj, Visitor *v,
                                         void *opaque, const char *name,
                                         Error **errp)
 {
     Q35PCIHost *s = Q35_HOST_DEVICE(obj);
     uint32_t value = s->mch.pci_info.w32.begin;

     visit_type_uint32(v, &value, name, errp);
 }

 static void q35_host_get_pci_hole_end(Object *obj, Visitor *v,
                                       void *opaque, const char *name,
                                       Error **errp)
 {
     Q35PCIHost *s = Q35_HOST_DEVICE(obj);
     uint32_t value = s->mch.pci_info.w32.end;

     visit_type_uint32(v, &value, name, errp);
 }

 static void q35_host_get_pci_hole64_start(Object *obj, Visitor *v,
                                           void *opaque, const char *name,
                                           Error **errp)
 {
     PCIHostState *h = PCI_HOST_BRIDGE(obj);
     Range w64;

     pci_bus_get_w64_range(h->bus, &w64);

     visit_type_uint64(v, &w64.begin, name, errp);
 }

 static void q35_host_get_pci_hole64_end(Object *obj, Visitor *v,
                                         void *opaque, const char *name,
                                         Error **errp)
 {
     PCIHostState *h = PCI_HOST_BRIDGE(obj);
     Range w64;

     pci_bus_get_w64_range(h->bus, &w64);

     visit_type_uint64(v, &w64.end, name, errp);
 }

 static void q35_host_get_mmcfg_size(Object *obj, Visitor *v,
                                     void *opaque, const char *name,
                                     Error **errp)
 {
     PCIExpressHost *e = PCIE_HOST_BRIDGE(obj);
     uint32_t value = e->size;

     visit_type_uint32(v, &value, name, errp);
 }

 static Property mch_props[] = {
     DEFINE_PROP_UINT64(PCIE_HOST_MCFG_BASE, Q35PCIHost, parent_obj.base_addr,
                         MCH_HOST_BRIDGE_PCIEXBAR_DEFAULT),
     DEFINE_PROP_SIZE(PCI_HOST_PROP_PCI_HOLE64_SIZE, Q35PCIHost,
                      mch.pci_hole64_size, DEFAULT_PCI_HOLE64_SIZE),
     DEFINE_PROP_UINT32("short_root_bus", Q35PCIHost, mch.short_root_bus, 0),
     DEFINE_PROP_END_OF_LIST(),
 };

 static void q35_host_class_init(ObjectClass *klass, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(klass);
     PCIHostBridgeClass *hc = PCI_HOST_BRIDGE_CLASS(klass);

     hc->root_bus_path = q35_host_root_bus_path;
     dc->realize = q35_host_realize;
     dc->props = mch_props;
     set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
     dc->fw_name = "pci";
 }

 static void q35_host_initfn(Object *obj)
 {
     Q35PCIHost *s = Q35_HOST_DEVICE(obj);
     PCIHostState *phb = PCI_HOST_BRIDGE(obj);

     memory_region_init_io(&phb->conf_mem, obj, &pci_host_conf_le_ops, phb,
                           "pci-conf-idx", 4);
     memory_region_init_io(&phb->data_mem, obj, &pci_host_data_le_ops, phb,
                           "pci-conf-data", 4);

     object_initialize(&s->mch, sizeof(s->mch), TYPE_MCH_PCI_DEVICE);
     object_property_add_child(OBJECT(s), "mch", OBJECT(&s->mch), NULL);
     qdev_prop_set_uint32(DEVICE(&s->mch), "addr", PCI_DEVFN(0, 0));
     qdev_prop_set_bit(DEVICE(&s->mch), "multifunction", false);

     object_property_add(obj, PCI_HOST_PROP_PCI_HOLE_START, "int",
                         q35_host_get_pci_hole_start,
                         NULL, NULL, NULL, NULL);

     object_property_add(obj, PCI_HOST_PROP_PCI_HOLE_END, "int",
                         q35_host_get_pci_hole_end,
                         NULL, NULL, NULL, NULL);

     object_property_add(obj, PCI_HOST_PROP_PCI_HOLE64_START, "int",
                         q35_host_get_pci_hole64_start,
                         NULL, NULL, NULL, NULL);

     object_property_add(obj, PCI_HOST_PROP_PCI_HOLE64_END, "int",
                         q35_host_get_pci_hole64_end,
                         NULL, NULL, NULL, NULL);

     object_property_add(obj, PCIE_HOST_MCFG_SIZE, "int",
                         q35_host_get_mmcfg_size,
                         NULL, NULL, NULL, NULL);

     /* Leave enough space for the biggest MCFG BAR */
     /* TODO: this matches current bios behaviour, but
      * it's not a power of two, which means an MTRR
      * can't cover it exactly.
      */
     s->mch.pci_info.w32.begin = MCH_HOST_BRIDGE_PCIEXBAR_DEFAULT +
         MCH_HOST_BRIDGE_PCIEXBAR_MAX;
     s->mch.pci_info.w32.end = IO_APIC_DEFAULT_ADDRESS;
 }

 static const TypeInfo q35_host_info = {
     .name       = TYPE_Q35_HOST_DEVICE,
     .parent     = TYPE_PCIE_HOST_BRIDGE,
     .instance_size = sizeof(Q35PCIHost),
     .instance_init = q35_host_initfn,
     .class_init = q35_host_class_init,
 };

 /****************************************************************************
  * MCH D0:F0
  */

 /* PCIe MMCFG */
 static void mch_update_pciexbar(MCHPCIState *mch)
 {
     PCIDevice *pci_dev = PCI_DEVICE(mch);
     BusState *bus = qdev_get_parent_bus(DEVICE(mch));
     PCIExpressHost *pehb = PCIE_HOST_BRIDGE(bus->parent);

     uint64_t pciexbar;
     int enable;
     uint64_t addr;
     uint64_t addr_mask;
     uint32_t length;

     pciexbar = pci_get_quad(pci_dev->config + MCH_HOST_BRIDGE_PCIEXBAR);
     enable = pciexbar & MCH_HOST_BRIDGE_PCIEXBAREN;
     addr_mask = MCH_HOST_BRIDGE_PCIEXBAR_ADMSK;
     switch (pciexbar & MCH_HOST_BRIDGE_PCIEXBAR_LENGTH_MASK) {
     case MCH_HOST_BRIDGE_PCIEXBAR_LENGTH_256M:
         length = 256 * 1024 * 1024;
         break;
     case MCH_HOST_BRIDGE_PCIEXBAR_LENGTH_128M:
         length = 128 * 1024 * 1024;
         addr_mask |= MCH_HOST_BRIDGE_PCIEXBAR_128ADMSK |
             MCH_HOST_BRIDGE_PCIEXBAR_64ADMSK;
         break;
     case MCH_HOST_BRIDGE_PCIEXBAR_LENGTH_64M:
         length = 64 * 1024 * 1024;
         addr_mask |= MCH_HOST_BRIDGE_PCIEXBAR_64ADMSK;
         break;
     case MCH_HOST_BRIDGE_PCIEXBAR_LENGTH_RVD:
     default:
         enable = 0;
         length = 0;
         abort();
         break;
     }
     addr = pciexbar & addr_mask;
     pcie_host_mmcfg_update(pehb, enable, addr, length);
     /* Leave enough space for the MCFG BAR */
     /*
      * TODO: this matches current bios behaviour, but it's not a power of two,
      * which means an MTRR can't cover it exactly.
      */
     if (enable) {
         mch->pci_info.w32.begin = addr + length;
     } else {
         mch->pci_info.w32.begin = MCH_HOST_BRIDGE_PCIEXBAR_DEFAULT;
     }
 }

 /* PAM */
 static void mch_update_pam(MCHPCIState *mch)
 {
     PCIDevice *pd = PCI_DEVICE(mch);
     int i;

     memory_region_transaction_begin();
     for (i = 0; i < 13; i++) {
         pam_update(&mch->pam_regions[i], i,
                    pd->config[MCH_HOST_BRIDGE_PAM0 + ((i + 1) / 2)]);
     }
     memory_region_transaction_commit();
 }

 /* SMRAM */
 static void mch_update_smram(MCHPCIState *mch)
 {
     PCIDevice *pd = PCI_DEVICE(mch);

     memory_region_transaction_begin();
     smram_update(&mch->smram_region, pd->config[MCH_HOST_BRIDGE_SMRAM],
                     mch->smm_enabled);
     memory_region_transaction_commit();
 }

 static void mch_set_smm(int smm, void *arg)
 {
     MCHPCIState *mch = arg;
     PCIDevice *pd = PCI_DEVICE(mch);

     memory_region_transaction_begin();
     smram_set_smm(&mch->smm_enabled, smm, pd->config[MCH_HOST_BRIDGE_SMRAM],
                     &mch->smram_region);
     memory_region_transaction_commit();
 }

 static void mch_write_config(PCIDevice *d,
                               uint32_t address, uint32_t val, int len)
 {
     MCHPCIState *mch = MCH_PCI_DEVICE(d);

     /* XXX: implement SMRAM.D_LOCK */
     pci_default_write_config(d, address, val, len);

     if (ranges_overlap(address, len, MCH_HOST_BRIDGE_PAM0,
                        MCH_HOST_BRIDGE_PAM_SIZE)) {
         mch_update_pam(mch);
     }

     if (ranges_overlap(address, len, MCH_HOST_BRIDGE_PCIEXBAR,
                        MCH_HOST_BRIDGE_PCIEXBAR_SIZE)) {
         mch_update_pciexbar(mch);
     }

     if (ranges_overlap(address, len, MCH_HOST_BRIDGE_SMRAM,
                        MCH_HOST_BRIDGE_SMRAM_SIZE)) {
         mch_update_smram(mch);
     }
 }

 static void mch_update(MCHPCIState *mch)
 {
     mch_update_pciexbar(mch);
     mch_update_pam(mch);
     mch_update_smram(mch);
 }

 static int mch_post_load(void *opaque, int version_id)
 {
     MCHPCIState *mch = opaque;
     mch_update(mch);
     return 0;
 }

 static const VMStateDescription vmstate_mch = {
     .name = "mch",
     .version_id = 1,
     .minimum_version_id = 1,
     .post_load = mch_post_load,
     .fields = (VMStateField[]) {
         VMSTATE_PCI_DEVICE(parent_obj, MCHPCIState),
         VMSTATE_UINT8(smm_enabled, MCHPCIState),
         VMSTATE_END_OF_LIST()
     }
 };

 static void mch_reset(DeviceState *qdev)
 {
     PCIDevice *d = PCI_DEVICE(qdev);
     MCHPCIState *mch = MCH_PCI_DEVICE(d);

     pci_set_quad(d->config + MCH_HOST_BRIDGE_PCIEXBAR,
                  MCH_HOST_BRIDGE_PCIEXBAR_DEFAULT);

     d->config[MCH_HOST_BRIDGE_SMRAM] = MCH_HOST_BRIDGE_SMRAM_DEFAULT;

     mch_update(mch);
 }

 static int mch_init(PCIDevice *d)
 {
     int i;
     MCHPCIState *mch = MCH_PCI_DEVICE(d);

     /* setup pci memory mapping */
     pc_pci_as_mapping_init(OBJECT(mch), mch->system_memory,
                            mch->pci_address_space);

     /* smram */
     cpu_smm_register(&mch_set_smm, mch);
     memory_region_init_alias(&mch->smram_region, OBJECT(mch), "smram-region",
                              mch->pci_address_space, 0xa0000, 0x20000);
     memory_region_add_subregion_overlap(mch->system_memory, 0xa0000,
                                         &mch->smram_region, 1);
     memory_region_set_enabled(&mch->smram_region, false);
     init_pam(DEVICE(mch), mch->ram_memory, mch->system_memory, mch->pci_address_space,
              &mch->pam_regions[0], PAM_BIOS_BASE, PAM_BIOS_SIZE);
     for (i = 0; i < 12; ++i) {
         init_pam(DEVICE(mch), mch->ram_memory, mch->system_memory, mch->pci_address_space,
                  &mch->pam_regions[i+1], PAM_EXPAN_BASE + i * PAM_EXPAN_SIZE,
                  PAM_EXPAN_SIZE);
     }
     return 0;
 }

 uint64_t mch_mcfg_base(void)
 {
     bool ambiguous;
     Object *o = object_resolve_path_type("", TYPE_MCH_PCI_DEVICE, &ambiguous);
     if (!o) {
         return 0;
     }
     return MCH_HOST_BRIDGE_PCIEXBAR_DEFAULT;
 }

 static void mch_class_init(ObjectClass *klass, void *data)
 {
     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
     DeviceClass *dc = DEVICE_CLASS(klass);

     k->init = mch_init;
     k->config_write = mch_write_config;
     dc->reset = mch_reset;
     set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
     dc->desc = "Host bridge";
     dc->vmsd = &vmstate_mch;
     k->vendor_id = PCI_VENDOR_ID_INTEL;
     k->device_id = PCI_DEVICE_ID_INTEL_Q35_MCH;
     k->revision = MCH_HOST_BRIDGE_REVISION_DEFAULT;
     k->class_id = PCI_CLASS_BRIDGE_HOST;
     /*
      * PCI-facing part of the host bridge, not usable without the
      * host-facing part, which can't be device_add'ed, yet.
      */
     dc->cannot_instantiate_with_device_add_yet = true;
 }

 static const TypeInfo mch_info = {
     .name = TYPE_MCH_PCI_DEVICE,
     .parent = TYPE_PCI_DEVICE,
     .instance_size = sizeof(MCHPCIState),
     .class_init = mch_class_init,
 };

 static void q35_register(void)
 {
     type_register_static(&mch_info);
     type_register_static(&q35_host_info);
 }

 type_init(q35_register);
	/*
	* QEMU MCH/ICH9 PCI Bridge Emulation
	*
	* Copyright (c) 2006 Fabrice Bellard
	* Copyright (c) 2009, 2010, 2011
	* Isaku Yamahata <yamahata at valinux co jp>
	* VA Linux Systems Japan K.K.
	* Copyright (C) 2012 Jason Baron <jbaron@redhat.com>
	*
	* This is based on piix_pci.c, but heavily modified.
	*
	* Permission is hereby granted, free of charge, to any person obtaining a copy
	* of this software and associated documentation files (the "Software"), to deal
	* in the Software without restriction, including without limitation the rights
	* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
	* copies of the Software, and to permit persons to whom the Software is
	* furnished to do so, subject to the following conditions:
	*
	* The above copyright notice and this permission notice shall be included in
	* all copies or substantial portions of the Software.
	*
	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
	* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
	* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
	* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
	* THE SOFTWARE.
	*/
	#include "hw/hw.h"
	#include "hw/pci-host/q35.h"
	#include "qapi/visitor.h"

	/****************************************************************************
	* Q35 host
	*/

	static void q35_host_realize(DeviceState dev, Error *errp)
	{
	PCIHostState *pci = PCI_HOST_BRIDGE(dev);
	Q35PCIHost *s = Q35_HOST_DEVICE(dev);
	SysBusDevice *sbd = SYS_BUS_DEVICE(dev);

	sysbus_add_io(sbd, MCH_HOST_BRIDGE_CONFIG_ADDR, &pci->conf_mem);
	sysbus_init_ioports(sbd, MCH_HOST_BRIDGE_CONFIG_ADDR, 4);

	sysbus_add_io(sbd, MCH_HOST_BRIDGE_CONFIG_DATA, &pci->data_mem);
	sysbus_init_ioports(sbd, MCH_HOST_BRIDGE_CONFIG_DATA, 4);

	pci->bus = pci_bus_new(DEVICE(s), "pcie.0",
	s->mch.pci_address_space, s->mch.address_space_io,
	0, TYPE_PCIE_BUS);
	qdev_set_parent_bus(DEVICE(&s->mch), BUS(pci->bus));
	qdev_init_nofail(DEVICE(&s->mch));
	}

	static const char q35_host_root_bus_path(PCIHostState host_bridge,
	PCIBus *rootbus)
	{
	Q35PCIHost *s = Q35_HOST_DEVICE(host_bridge);

	/* For backwards compat with old device paths */
	if (s->mch.short_root_bus) {
	return "0000";
	}
	return "0000:00";
	}

	static void q35_host_get_pci_hole_start(Object obj, Visitor v,
	void opaque, const char name,
	Error **errp)
	{
	Q35PCIHost *s = Q35_HOST_DEVICE(obj);
	uint32_t value = s->mch.pci_info.w32.begin;

	visit_type_uint32(v, &value, name, errp);
	}

	static void q35_host_get_pci_hole_end(Object obj, Visitor v,
	void opaque, const char name,
	Error **errp)
	{
	Q35PCIHost *s = Q35_HOST_DEVICE(obj);
	uint32_t value = s->mch.pci_info.w32.end;

	visit_type_uint32(v, &value, name, errp);
	}

	static void q35_host_get_pci_hole64_start(Object obj, Visitor v,
	void opaque, const char name,
	Error **errp)
	{
	PCIHostState *h = PCI_HOST_BRIDGE(obj);
	Range w64;

	pci_bus_get_w64_range(h->bus, &w64);

	visit_type_uint64(v, &w64.begin, name, errp);
	}

	static void q35_host_get_pci_hole64_end(Object obj, Visitor v,
	void opaque, const char name,
	Error **errp)
	{
	PCIHostState *h = PCI_HOST_BRIDGE(obj);
	Range w64;

	pci_bus_get_w64_range(h->bus, &w64);

	visit_type_uint64(v, &w64.end, name, errp);
	}

	static void q35_host_get_mmcfg_size(Object obj, Visitor v,
	void opaque, const char name,
	Error **errp)
	{
	PCIExpressHost *e = PCIE_HOST_BRIDGE(obj);
	uint32_t value = e->size;

	visit_type_uint32(v, &value, name, errp);
	}

	static Property mch_props[] = {
	DEFINE_PROP_UINT64(PCIE_HOST_MCFG_BASE, Q35PCIHost, parent_obj.base_addr,
	MCH_HOST_BRIDGE_PCIEXBAR_DEFAULT),
	DEFINE_PROP_SIZE(PCI_HOST_PROP_PCI_HOLE64_SIZE, Q35PCIHost,
	mch.pci_hole64_size, DEFAULT_PCI_HOLE64_SIZE),
	DEFINE_PROP_UINT32("short_root_bus", Q35PCIHost, mch.short_root_bus, 0),
	DEFINE_PROP_END_OF_LIST(),
	};

	static void q35_host_class_init(ObjectClass klass, void data)
	{
	DeviceClass *dc = DEVICE_CLASS(klass);
	PCIHostBridgeClass *hc = PCI_HOST_BRIDGE_CLASS(klass);

	hc->root_bus_path = q35_host_root_bus_path;
	dc->realize = q35_host_realize;
	dc->props = mch_props;
	set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
	dc->fw_name = "pci";
	}

	static void q35_host_initfn(Object *obj)
	{
	Q35PCIHost *s = Q35_HOST_DEVICE(obj);
	PCIHostState *phb = PCI_HOST_BRIDGE(obj);

	memory_region_init_io(&phb->conf_mem, obj, &pci_host_conf_le_ops, phb,
	"pci-conf-idx", 4);
	memory_region_init_io(&phb->data_mem, obj, &pci_host_data_le_ops, phb,
	"pci-conf-data", 4);

	object_initialize(&s->mch, sizeof(s->mch), TYPE_MCH_PCI_DEVICE);
	object_property_add_child(OBJECT(s), "mch", OBJECT(&s->mch), NULL);
	qdev_prop_set_uint32(DEVICE(&s->mch), "addr", PCI_DEVFN(0, 0));
	qdev_prop_set_bit(DEVICE(&s->mch), "multifunction", false);

	object_property_add(obj, PCI_HOST_PROP_PCI_HOLE_START, "int",
	q35_host_get_pci_hole_start,
	NULL, NULL, NULL, NULL);

	object_property_add(obj, PCI_HOST_PROP_PCI_HOLE_END, "int",
	q35_host_get_pci_hole_end,
	NULL, NULL, NULL, NULL);

	object_property_add(obj, PCI_HOST_PROP_PCI_HOLE64_START, "int",
	q35_host_get_pci_hole64_start,
	NULL, NULL, NULL, NULL);

	object_property_add(obj, PCI_HOST_PROP_PCI_HOLE64_END, "int",
	q35_host_get_pci_hole64_end,
	NULL, NULL, NULL, NULL);

	object_property_add(obj, PCIE_HOST_MCFG_SIZE, "int",
	q35_host_get_mmcfg_size,
	NULL, NULL, NULL, NULL);

	/* Leave enough space for the biggest MCFG BAR */
	/* TODO: this matches current bios behaviour, but
	* it's not a power of two, which means an MTRR
	* can't cover it exactly.
	*/
	s->mch.pci_info.w32.begin = MCH_HOST_BRIDGE_PCIEXBAR_DEFAULT +
	MCH_HOST_BRIDGE_PCIEXBAR_MAX;
	s->mch.pci_info.w32.end = IO_APIC_DEFAULT_ADDRESS;
	}

	static const TypeInfo q35_host_info = {
	.name = TYPE_Q35_HOST_DEVICE,
	.parent = TYPE_PCIE_HOST_BRIDGE,
	.instance_size = sizeof(Q35PCIHost),
	.instance_init = q35_host_initfn,
	.class_init = q35_host_class_init,
	};

	/****************************************************************************
	* MCH D0:F0
	*/

	/* PCIe MMCFG */
	static void mch_update_pciexbar(MCHPCIState *mch)
	{
	PCIDevice *pci_dev = PCI_DEVICE(mch);
	BusState *bus = qdev_get_parent_bus(DEVICE(mch));
	PCIExpressHost *pehb = PCIE_HOST_BRIDGE(bus->parent);

	uint64_t pciexbar;
	int enable;
	uint64_t addr;
	uint64_t addr_mask;
	uint32_t length;

	pciexbar = pci_get_quad(pci_dev->config + MCH_HOST_BRIDGE_PCIEXBAR);
	enable = pciexbar & MCH_HOST_BRIDGE_PCIEXBAREN;
	addr_mask = MCH_HOST_BRIDGE_PCIEXBAR_ADMSK;
	switch (pciexbar & MCH_HOST_BRIDGE_PCIEXBAR_LENGTH_MASK) {
	case MCH_HOST_BRIDGE_PCIEXBAR_LENGTH_256M:
	length = 256 * 1024 * 1024;
	break;
	case MCH_HOST_BRIDGE_PCIEXBAR_LENGTH_128M:
	length = 128 * 1024 * 1024;
	addr_mask \|= MCH_HOST_BRIDGE_PCIEXBAR_128ADMSK \|
	MCH_HOST_BRIDGE_PCIEXBAR_64ADMSK;
	break;
	case MCH_HOST_BRIDGE_PCIEXBAR_LENGTH_64M:
	length = 64 * 1024 * 1024;
	addr_mask \|= MCH_HOST_BRIDGE_PCIEXBAR_64ADMSK;
	break;
	case MCH_HOST_BRIDGE_PCIEXBAR_LENGTH_RVD:
	default:
	enable = 0;
	length = 0;
	abort();
	break;
	}
	addr = pciexbar & addr_mask;
	pcie_host_mmcfg_update(pehb, enable, addr, length);
	/* Leave enough space for the MCFG BAR */
	/*
	* TODO: this matches current bios behaviour, but it's not a power of two,
	* which means an MTRR can't cover it exactly.
	*/
	if (enable) {
	mch->pci_info.w32.begin = addr + length;
	} else {
	mch->pci_info.w32.begin = MCH_HOST_BRIDGE_PCIEXBAR_DEFAULT;
	}
	}

	/* PAM */
	static void mch_update_pam(MCHPCIState *mch)
	{
	PCIDevice *pd = PCI_DEVICE(mch);
	int i;

	memory_region_transaction_begin();
	for (i = 0; i < 13; i++) {
	pam_update(&mch->pam_regions[i], i,
	pd->config[MCH_HOST_BRIDGE_PAM0 + ((i + 1) / 2)]);
	}
	memory_region_transaction_commit();
	}

	/* SMRAM */
	static void mch_update_smram(MCHPCIState *mch)
	{
	PCIDevice *pd = PCI_DEVICE(mch);

	memory_region_transaction_begin();
	smram_update(&mch->smram_region, pd->config[MCH_HOST_BRIDGE_SMRAM],
	mch->smm_enabled);
	memory_region_transaction_commit();
	}

	static void mch_set_smm(int smm, void *arg)
	{
	MCHPCIState *mch = arg;
	PCIDevice *pd = PCI_DEVICE(mch);

	memory_region_transaction_begin();
	smram_set_smm(&mch->smm_enabled, smm, pd->config[MCH_HOST_BRIDGE_SMRAM],
	&mch->smram_region);
	memory_region_transaction_commit();
	}

	static void mch_write_config(PCIDevice *d,
	uint32_t address, uint32_t val, int len)
	{
	MCHPCIState *mch = MCH_PCI_DEVICE(d);

	/* XXX: implement SMRAM.D_LOCK */
	pci_default_write_config(d, address, val, len);

	if (ranges_overlap(address, len, MCH_HOST_BRIDGE_PAM0,
	MCH_HOST_BRIDGE_PAM_SIZE)) {
	mch_update_pam(mch);
	}

	if (ranges_overlap(address, len, MCH_HOST_BRIDGE_PCIEXBAR,
	MCH_HOST_BRIDGE_PCIEXBAR_SIZE)) {
	mch_update_pciexbar(mch);
	}

	if (ranges_overlap(address, len, MCH_HOST_BRIDGE_SMRAM,
	MCH_HOST_BRIDGE_SMRAM_SIZE)) {
	mch_update_smram(mch);
	}
	}

	static void mch_update(MCHPCIState *mch)
	{
	mch_update_pciexbar(mch);
	mch_update_pam(mch);
	mch_update_smram(mch);
	}

	static int mch_post_load(void *opaque, int version_id)
	{
	MCHPCIState *mch = opaque;
	mch_update(mch);
	return 0;
	}

	static const VMStateDescription vmstate_mch = {
	.name = "mch",
	.version_id = 1,
	.minimum_version_id = 1,
	.post_load = mch_post_load,
	.fields = (VMStateField[]) {
	VMSTATE_PCI_DEVICE(parent_obj, MCHPCIState),
	VMSTATE_UINT8(smm_enabled, MCHPCIState),
	VMSTATE_END_OF_LIST()
	}
	};

	static void mch_reset(DeviceState *qdev)
	{
	PCIDevice *d = PCI_DEVICE(qdev);
	MCHPCIState *mch = MCH_PCI_DEVICE(d);

	pci_set_quad(d->config + MCH_HOST_BRIDGE_PCIEXBAR,
	MCH_HOST_BRIDGE_PCIEXBAR_DEFAULT);

	d->config[MCH_HOST_BRIDGE_SMRAM] = MCH_HOST_BRIDGE_SMRAM_DEFAULT;

	mch_update(mch);
	}

	static int mch_init(PCIDevice *d)
	{
	int i;
	MCHPCIState *mch = MCH_PCI_DEVICE(d);

	/* setup pci memory mapping */
	pc_pci_as_mapping_init(OBJECT(mch), mch->system_memory,
	mch->pci_address_space);

	/* smram */
	cpu_smm_register(&mch_set_smm, mch);
	memory_region_init_alias(&mch->smram_region, OBJECT(mch), "smram-region",
	mch->pci_address_space, 0xa0000, 0x20000);
	memory_region_add_subregion_overlap(mch->system_memory, 0xa0000,
	&mch->smram_region, 1);
	memory_region_set_enabled(&mch->smram_region, false);
	init_pam(DEVICE(mch), mch->ram_memory, mch->system_memory, mch->pci_address_space,
	&mch->pam_regions[0], PAM_BIOS_BASE, PAM_BIOS_SIZE);
	for (i = 0; i < 12; ++i) {
	init_pam(DEVICE(mch), mch->ram_memory, mch->system_memory, mch->pci_address_space,
	&mch->pam_regions[i+1], PAM_EXPAN_BASE + i * PAM_EXPAN_SIZE,
	PAM_EXPAN_SIZE);
	}
	return 0;
	}

	uint64_t mch_mcfg_base(void)
	{
	bool ambiguous;
	Object *o = object_resolve_path_type("", TYPE_MCH_PCI_DEVICE, &ambiguous);
	if (!o) {
	return 0;
	}
	return MCH_HOST_BRIDGE_PCIEXBAR_DEFAULT;
	}

	static void mch_class_init(ObjectClass klass, void data)
	{
	PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
	DeviceClass *dc = DEVICE_CLASS(klass);

	k->init = mch_init;
	k->config_write = mch_write_config;
	dc->reset = mch_reset;
	set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
	dc->desc = "Host bridge";
	dc->vmsd = &vmstate_mch;
	k->vendor_id = PCI_VENDOR_ID_INTEL;
	k->device_id = PCI_DEVICE_ID_INTEL_Q35_MCH;
	k->revision = MCH_HOST_BRIDGE_REVISION_DEFAULT;
	k->class_id = PCI_CLASS_BRIDGE_HOST;
	/*
	* PCI-facing part of the host bridge, not usable without the
	* host-facing part, which can't be device_add'ed, yet.
	*/
	dc->cannot_instantiate_with_device_add_yet = true;
	}

	static const TypeInfo mch_info = {
	.name = TYPE_MCH_PCI_DEVICE,
	.parent = TYPE_PCI_DEVICE,
	.instance_size = sizeof(MCHPCIState),
	.class_init = mch_class_init,
	};

	static void q35_register(void)
	{
	type_register_static(&mch_info);
	type_register_static(&q35_host_info);
	}

	type_init(q35_register);