hw/piix_pci.c - qemu - Git at Google

 /*
  * QEMU i440FX/PIIX3 PCI Bridge Emulation
  *
  * Copyright (c) 2006 Fabrice Bellard
  *
  * 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.h"
 #include "pc.h"
 #include "pci.h"
 #include "pci_host.h"
 #include "isa.h"
 #include "sysbus.h"

 /*
  * I440FX chipset data sheet.
  * http://download.intel.com/design/chipsets/datashts/29054901.pdf
  */

 typedef PCIHostState I440FXState;

 typedef struct PIIX3State {
     PCIDevice dev;
     int pci_irq_levels[4];
     qemu_irq *pic;
 } PIIX3State;

 struct PCII440FXState {
     PCIDevice dev;
     target_phys_addr_t isa_page_descs[384 / 4];
     uint8_t smm_enabled;
     PIIX3State *piix3;
 };


 #define I440FX_PAM      0x59
 #define I440FX_PAM_SIZE 7
 #define I440FX_SMRAM    0x72

 static void piix3_set_irq(void *opaque, int irq_num, int level);

 /* return the global irq number corresponding to a given device irq
    pin. We could also use the bus number to have a more precise
    mapping. */
 static int pci_slot_get_pirq(PCIDevice *pci_dev, int irq_num)
 {
     int slot_addend;
     slot_addend = (pci_dev->devfn >> 3) - 1;
     return (irq_num + slot_addend) & 3;
 }

 static void update_pam(PCII440FXState *d, uint32_t start, uint32_t end, int r)
 {
     uint32_t addr;

     //    printf("ISA mapping %08x-0x%08x: %d\n", start, end, r);
     switch(r) {
     case 3:
         /* RAM */
         cpu_register_physical_memory(start, end - start,
                                      start);
         break;
     case 1:
         /* ROM (XXX: not quite correct) */
         cpu_register_physical_memory(start, end - start,
                                      start | IO_MEM_ROM);
         break;
     case 2:
     case 0:
         /* XXX: should distinguish read/write cases */
         for(addr = start; addr < end; addr += 4096) {
             cpu_register_physical_memory(addr, 4096,
                                          d->isa_page_descs[(addr - 0xa0000) >> 12]);
         }
         break;
     }
 }

 static void i440fx_update_memory_mappings(PCII440FXState *d)
 {
     int i, r;
     uint32_t smram, addr;

     update_pam(d, 0xf0000, 0x100000, (d->dev.config[I440FX_PAM] >> 4) & 3);
     for(i = 0; i < 12; i++) {
         r = (d->dev.config[(i >> 1) + (I440FX_PAM + 1)] >> ((i & 1) * 4)) & 3;
         update_pam(d, 0xc0000 + 0x4000 * i, 0xc0000 + 0x4000 * (i + 1), r);
     }
     smram = d->dev.config[I440FX_SMRAM];
     if ((d->smm_enabled && (smram & 0x08)) || (smram & 0x40)) {
         cpu_register_physical_memory(0xa0000, 0x20000, 0xa0000);
     } else {
         for(addr = 0xa0000; addr < 0xc0000; addr += 4096) {
             cpu_register_physical_memory(addr, 4096,
                                          d->isa_page_descs[(addr - 0xa0000) >> 12]);
         }
     }
 }

 void i440fx_set_smm(PCII440FXState *d, int val)
 {
     val = (val != 0);
     if (d->smm_enabled != val) {
         d->smm_enabled = val;
         i440fx_update_memory_mappings(d);
     }
 }


 /* XXX: suppress when better memory API. We make the assumption that
    no device (in particular the VGA) changes the memory mappings in
    the 0xa0000-0x100000 range */
 void i440fx_init_memory_mappings(PCII440FXState *d)
 {
     int i;
     for(i = 0; i < 96; i++) {
         d->isa_page_descs[i] = cpu_get_physical_page_desc(0xa0000 + i * 0x1000);
     }
 }

 static void i440fx_write_config(PCIDevice *dev,
                                 uint32_t address, uint32_t val, int len)
 {
     PCII440FXState *d = DO_UPCAST(PCII440FXState, dev, dev);

     /* XXX: implement SMRAM.D_LOCK */
     pci_default_write_config(dev, address, val, len);
     if (ranges_overlap(address, len, I440FX_PAM, I440FX_PAM_SIZE) ||
         range_covers_byte(address, len, I440FX_SMRAM)) {
         i440fx_update_memory_mappings(d);
     }
 }

 static int i440fx_load_old(QEMUFile* f, void *opaque, int version_id)
 {
     PCII440FXState *d = opaque;
     int ret, i;

     ret = pci_device_load(&d->dev, f);
     if (ret < 0)
         return ret;
     i440fx_update_memory_mappings(d);
     qemu_get_8s(f, &d->smm_enabled);

     if (version_id == 2)
         for (i = 0; i < 4; i++)
             d->piix3->pci_irq_levels[i] = qemu_get_be32(f);

     return 0;
 }

 static int i440fx_post_load(void *opaque, int version_id)
 {
     PCII440FXState *d = opaque;

     i440fx_update_memory_mappings(d);
     return 0;
 }

 static const VMStateDescription vmstate_i440fx = {
     .name = "I440FX",
     .version_id = 3,
     .minimum_version_id = 3,
     .minimum_version_id_old = 1,
     .load_state_old = i440fx_load_old,
     .post_load = i440fx_post_load,
     .fields      = (VMStateField []) {
         VMSTATE_PCI_DEVICE(dev, PCII440FXState),
         VMSTATE_UINT8(smm_enabled, PCII440FXState),
         VMSTATE_END_OF_LIST()
     }
 };

 static int i440fx_pcihost_initfn(SysBusDevice *dev)
 {
     I440FXState *s = FROM_SYSBUS(I440FXState, dev);

     pci_host_conf_register_ioport(0xcf8, s);

     pci_host_data_register_ioport(0xcfc, s);
     return 0;
 }

 static int i440fx_initfn(PCIDevice *dev)
 {
     PCII440FXState *d = DO_UPCAST(PCII440FXState, dev, dev);

     pci_config_set_vendor_id(d->dev.config, PCI_VENDOR_ID_INTEL);
     pci_config_set_device_id(d->dev.config, PCI_DEVICE_ID_INTEL_82441);
     d->dev.config[0x08] = 0x02; // revision
     pci_config_set_class(d->dev.config, PCI_CLASS_BRIDGE_HOST);
     d->dev.config[PCI_HEADER_TYPE] = PCI_HEADER_TYPE_NORMAL; // header_type

     d->dev.config[I440FX_SMRAM] = 0x02;

     return 0;
 }

 PCIBus *i440fx_init(PCII440FXState **pi440fx_state, int *piix3_devfn, qemu_irq *pic)
 {
     DeviceState *dev;
     PCIBus *b;
     PCIDevice *d;
     I440FXState *s;
     PIIX3State *piix3;

     dev = qdev_create(NULL, "i440FX-pcihost");
     s = FROM_SYSBUS(I440FXState, sysbus_from_qdev(dev));
     b = pci_bus_new(&s->busdev.qdev, NULL, 0);
     s->bus = b;
     qdev_init_nofail(dev);

     d = pci_create_simple(b, 0, "i440FX");
     *pi440fx_state = DO_UPCAST(PCII440FXState, dev, d);

     piix3 = DO_UPCAST(PIIX3State, dev,
                                  pci_create_simple(b, -1, "PIIX3"));
     piix3->pic = pic;
     pci_bus_irqs(b, piix3_set_irq, pci_slot_get_pirq, piix3, 4);
     (*pi440fx_state)->piix3 = piix3;

     *piix3_devfn = piix3->dev.devfn;

     return b;
 }

 /* PIIX3 PCI to ISA bridge */

 static void piix3_set_irq(void *opaque, int irq_num, int level)
 {
     int i, pic_irq, pic_level;
     PIIX3State *piix3 = opaque;

     piix3->pci_irq_levels[irq_num] = level;

     /* now we change the pic irq level according to the piix irq mappings */
     /* XXX: optimize */
     pic_irq = piix3->dev.config[0x60 + irq_num];
     if (pic_irq < 16) {
         /* The pic level is the logical OR of all the PCI irqs mapped
            to it */
         pic_level = 0;
         for (i = 0; i < 4; i++) {
             if (pic_irq == piix3->dev.config[0x60 + i])
                 pic_level |= piix3->pci_irq_levels[i];
         }
         qemu_set_irq(piix3->pic[pic_irq], pic_level);
     }
 }

 static void piix3_reset(void *opaque)
 {
     PIIX3State *d = opaque;
     uint8_t *pci_conf = d->dev.config;

     pci_conf[0x04] = 0x07; // master, memory and I/O
     pci_conf[0x05] = 0x00;
     pci_conf[0x06] = 0x00;
     pci_conf[0x07] = 0x02; // PCI_status_devsel_medium
     pci_conf[0x4c] = 0x4d;
     pci_conf[0x4e] = 0x03;
     pci_conf[0x4f] = 0x00;
     pci_conf[0x60] = 0x80;
     pci_conf[0x61] = 0x80;
     pci_conf[0x62] = 0x80;
     pci_conf[0x63] = 0x80;
     pci_conf[0x69] = 0x02;
     pci_conf[0x70] = 0x80;
     pci_conf[0x76] = 0x0c;
     pci_conf[0x77] = 0x0c;
     pci_conf[0x78] = 0x02;
     pci_conf[0x79] = 0x00;
     pci_conf[0x80] = 0x00;
     pci_conf[0x82] = 0x00;
     pci_conf[0xa0] = 0x08;
     pci_conf[0xa2] = 0x00;
     pci_conf[0xa3] = 0x00;
     pci_conf[0xa4] = 0x00;
     pci_conf[0xa5] = 0x00;
     pci_conf[0xa6] = 0x00;
     pci_conf[0xa7] = 0x00;
     pci_conf[0xa8] = 0x0f;
     pci_conf[0xaa] = 0x00;
     pci_conf[0xab] = 0x00;
     pci_conf[0xac] = 0x00;
     pci_conf[0xae] = 0x00;

     memset(d->pci_irq_levels, 0, sizeof(d->pci_irq_levels));
 }

 static const VMStateDescription vmstate_piix3 = {
     .name = "PIIX3",
     .version_id = 3,
     .minimum_version_id = 2,
     .minimum_version_id_old = 2,
     .fields      = (VMStateField []) {
         VMSTATE_PCI_DEVICE(dev, PIIX3State),
         VMSTATE_INT32_ARRAY_V(pci_irq_levels, PIIX3State, 4, 3),
         VMSTATE_END_OF_LIST()
     }
 };

 static int piix3_initfn(PCIDevice *dev)
 {
     PIIX3State *d = DO_UPCAST(PIIX3State, dev, dev);
     uint8_t *pci_conf;

     isa_bus_new(&d->dev.qdev);

     pci_conf = d->dev.config;
     pci_config_set_vendor_id(pci_conf, PCI_VENDOR_ID_INTEL);
     pci_config_set_device_id(pci_conf, PCI_DEVICE_ID_INTEL_82371SB_0); // 82371SB PIIX3 PCI-to-ISA bridge (Step A1)
     pci_config_set_class(pci_conf, PCI_CLASS_BRIDGE_ISA);
     pci_conf[PCI_HEADER_TYPE] =
         PCI_HEADER_TYPE_NORMAL | PCI_HEADER_TYPE_MULTI_FUNCTION; // header_type = PCI_multifunction, generic

     qemu_register_reset(piix3_reset, d);
     return 0;
 }

 static PCIDeviceInfo i440fx_info[] = {
     {
         .qdev.name    = "i440FX",
         .qdev.desc    = "Host bridge",
         .qdev.size    = sizeof(PCII440FXState),
         .qdev.vmsd    = &vmstate_i440fx,
         .qdev.no_user = 1,
         .init         = i440fx_initfn,
         .config_write = i440fx_write_config,
     },{
         .qdev.name    = "PIIX3",
         .qdev.desc    = "ISA bridge",
         .qdev.size    = sizeof(PIIX3State),
         .qdev.vmsd    = &vmstate_piix3,
         .qdev.no_user = 1,
         .init         = piix3_initfn,
     },{
         /* end of list */
     }
 };

 static SysBusDeviceInfo i440fx_pcihost_info = {
     .init         = i440fx_pcihost_initfn,
     .qdev.name    = "i440FX-pcihost",
     .qdev.size    = sizeof(I440FXState),
     .qdev.no_user = 1,
 };

 static void i440fx_register(void)
 {
     sysbus_register_withprop(&i440fx_pcihost_info);
     pci_qdev_register_many(i440fx_info);
 }
 device_init(i440fx_register);
	/*
	* QEMU i440FX/PIIX3 PCI Bridge Emulation
	*
	* Copyright (c) 2006 Fabrice Bellard
	*
	* 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.h"
	#include "pc.h"
	#include "pci.h"
	#include "pci_host.h"
	#include "isa.h"
	#include "sysbus.h"

	/*
	* I440FX chipset data sheet.
	* http://download.intel.com/design/chipsets/datashts/29054901.pdf
	*/

	typedef PCIHostState I440FXState;

	typedef struct PIIX3State {
	PCIDevice dev;
	int pci_irq_levels[4];
	qemu_irq *pic;
	} PIIX3State;

	struct PCII440FXState {
	PCIDevice dev;
	target_phys_addr_t isa_page_descs[384 / 4];
	uint8_t smm_enabled;
	PIIX3State *piix3;
	};


	#define I440FX_PAM 0x59
	#define I440FX_PAM_SIZE 7
	#define I440FX_SMRAM 0x72

	static void piix3_set_irq(void *opaque, int irq_num, int level);

	/* return the global irq number corresponding to a given device irq
	pin. We could also use the bus number to have a more precise
	mapping. */
	static int pci_slot_get_pirq(PCIDevice *pci_dev, int irq_num)
	{
	int slot_addend;
	slot_addend = (pci_dev->devfn >> 3) - 1;
	return (irq_num + slot_addend) & 3;
	}

	static void update_pam(PCII440FXState *d, uint32_t start, uint32_t end, int r)
	{
	uint32_t addr;

	// printf("ISA mapping %08x-0x%08x: %d\n", start, end, r);
	switch(r) {
	case 3:
	/* RAM */
	cpu_register_physical_memory(start, end - start,
	start);
	break;
	case 1:
	/* ROM (XXX: not quite correct) */
	cpu_register_physical_memory(start, end - start,
	start \| IO_MEM_ROM);
	break;
	case 2:
	case 0:
	/* XXX: should distinguish read/write cases */
	for(addr = start; addr < end; addr += 4096) {
	cpu_register_physical_memory(addr, 4096,
	d->isa_page_descs[(addr - 0xa0000) >> 12]);
	}
	break;
	}
	}

	static void i440fx_update_memory_mappings(PCII440FXState *d)
	{
	int i, r;
	uint32_t smram, addr;

	update_pam(d, 0xf0000, 0x100000, (d->dev.config[I440FX_PAM] >> 4) & 3);
	for(i = 0; i < 12; i++) {
	r = (d->dev.config[(i >> 1) + (I440FX_PAM + 1)] >> ((i & 1) * 4)) & 3;
	update_pam(d, 0xc0000 + 0x4000 * i, 0xc0000 + 0x4000 * (i + 1), r);
	}
	smram = d->dev.config[I440FX_SMRAM];
	if ((d->smm_enabled && (smram & 0x08)) \|\| (smram & 0x40)) {
	cpu_register_physical_memory(0xa0000, 0x20000, 0xa0000);
	} else {
	for(addr = 0xa0000; addr < 0xc0000; addr += 4096) {
	cpu_register_physical_memory(addr, 4096,
	d->isa_page_descs[(addr - 0xa0000) >> 12]);
	}
	}
	}

	void i440fx_set_smm(PCII440FXState *d, int val)
	{
	val = (val != 0);
	if (d->smm_enabled != val) {
	d->smm_enabled = val;
	i440fx_update_memory_mappings(d);
	}
	}


	/* XXX: suppress when better memory API. We make the assumption that
	no device (in particular the VGA) changes the memory mappings in
	the 0xa0000-0x100000 range */
	void i440fx_init_memory_mappings(PCII440FXState *d)
	{
	int i;
	for(i = 0; i < 96; i++) {
	d->isa_page_descs[i] = cpu_get_physical_page_desc(0xa0000 + i * 0x1000);
	}
	}

	static void i440fx_write_config(PCIDevice *dev,
	uint32_t address, uint32_t val, int len)
	{
	PCII440FXState *d = DO_UPCAST(PCII440FXState, dev, dev);

	/* XXX: implement SMRAM.D_LOCK */
	pci_default_write_config(dev, address, val, len);
	if (ranges_overlap(address, len, I440FX_PAM, I440FX_PAM_SIZE) \|\|
	range_covers_byte(address, len, I440FX_SMRAM)) {
	i440fx_update_memory_mappings(d);
	}
	}

	static int i440fx_load_old(QEMUFile* f, void *opaque, int version_id)
	{
	PCII440FXState *d = opaque;
	int ret, i;

	ret = pci_device_load(&d->dev, f);
	if (ret < 0)
	return ret;
	i440fx_update_memory_mappings(d);
	qemu_get_8s(f, &d->smm_enabled);

	if (version_id == 2)
	for (i = 0; i < 4; i++)
	d->piix3->pci_irq_levels[i] = qemu_get_be32(f);

	return 0;
	}

	static int i440fx_post_load(void *opaque, int version_id)
	{
	PCII440FXState *d = opaque;

	i440fx_update_memory_mappings(d);
	return 0;
	}

	static const VMStateDescription vmstate_i440fx = {
	.name = "I440FX",
	.version_id = 3,
	.minimum_version_id = 3,
	.minimum_version_id_old = 1,
	.load_state_old = i440fx_load_old,
	.post_load = i440fx_post_load,
	.fields = (VMStateField []) {
	VMSTATE_PCI_DEVICE(dev, PCII440FXState),
	VMSTATE_UINT8(smm_enabled, PCII440FXState),
	VMSTATE_END_OF_LIST()
	}
	};

	static int i440fx_pcihost_initfn(SysBusDevice *dev)
	{
	I440FXState *s = FROM_SYSBUS(I440FXState, dev);

	pci_host_conf_register_ioport(0xcf8, s);

	pci_host_data_register_ioport(0xcfc, s);
	return 0;
	}

	static int i440fx_initfn(PCIDevice *dev)
	{
	PCII440FXState *d = DO_UPCAST(PCII440FXState, dev, dev);

	pci_config_set_vendor_id(d->dev.config, PCI_VENDOR_ID_INTEL);
	pci_config_set_device_id(d->dev.config, PCI_DEVICE_ID_INTEL_82441);
	d->dev.config[0x08] = 0x02; // revision
	pci_config_set_class(d->dev.config, PCI_CLASS_BRIDGE_HOST);
	d->dev.config[PCI_HEADER_TYPE] = PCI_HEADER_TYPE_NORMAL; // header_type

	d->dev.config[I440FX_SMRAM] = 0x02;

	return 0;
	}

	PCIBus i440fx_init(PCII440FXState pi440fx_state, int piix3_devfn, qemu_irq *pic)
	{
	DeviceState *dev;
	PCIBus *b;
	PCIDevice *d;
	I440FXState *s;
	PIIX3State *piix3;

	dev = qdev_create(NULL, "i440FX-pcihost");
	s = FROM_SYSBUS(I440FXState, sysbus_from_qdev(dev));
	b = pci_bus_new(&s->busdev.qdev, NULL, 0);
	s->bus = b;
	qdev_init_nofail(dev);

	d = pci_create_simple(b, 0, "i440FX");
	*pi440fx_state = DO_UPCAST(PCII440FXState, dev, d);

	piix3 = DO_UPCAST(PIIX3State, dev,
	pci_create_simple(b, -1, "PIIX3"));
	piix3->pic = pic;
	pci_bus_irqs(b, piix3_set_irq, pci_slot_get_pirq, piix3, 4);
	(*pi440fx_state)->piix3 = piix3;

	*piix3_devfn = piix3->dev.devfn;

	return b;
	}

	/* PIIX3 PCI to ISA bridge */

	static void piix3_set_irq(void *opaque, int irq_num, int level)
	{
	int i, pic_irq, pic_level;
	PIIX3State *piix3 = opaque;

	piix3->pci_irq_levels[irq_num] = level;

	/* now we change the pic irq level according to the piix irq mappings */
	/* XXX: optimize */
	pic_irq = piix3->dev.config[0x60 + irq_num];
	if (pic_irq < 16) {
	/* The pic level is the logical OR of all the PCI irqs mapped
	to it */
	pic_level = 0;
	for (i = 0; i < 4; i++) {
	if (pic_irq == piix3->dev.config[0x60 + i])
	pic_level \|= piix3->pci_irq_levels[i];
	}
	qemu_set_irq(piix3->pic[pic_irq], pic_level);
	}
	}

	static void piix3_reset(void *opaque)
	{
	PIIX3State *d = opaque;
	uint8_t *pci_conf = d->dev.config;

	pci_conf[0x04] = 0x07; // master, memory and I/O
	pci_conf[0x05] = 0x00;
	pci_conf[0x06] = 0x00;
	pci_conf[0x07] = 0x02; // PCI_status_devsel_medium
	pci_conf[0x4c] = 0x4d;
	pci_conf[0x4e] = 0x03;
	pci_conf[0x4f] = 0x00;
	pci_conf[0x60] = 0x80;
	pci_conf[0x61] = 0x80;
	pci_conf[0x62] = 0x80;
	pci_conf[0x63] = 0x80;
	pci_conf[0x69] = 0x02;
	pci_conf[0x70] = 0x80;
	pci_conf[0x76] = 0x0c;
	pci_conf[0x77] = 0x0c;
	pci_conf[0x78] = 0x02;
	pci_conf[0x79] = 0x00;
	pci_conf[0x80] = 0x00;
	pci_conf[0x82] = 0x00;
	pci_conf[0xa0] = 0x08;
	pci_conf[0xa2] = 0x00;
	pci_conf[0xa3] = 0x00;
	pci_conf[0xa4] = 0x00;
	pci_conf[0xa5] = 0x00;
	pci_conf[0xa6] = 0x00;
	pci_conf[0xa7] = 0x00;
	pci_conf[0xa8] = 0x0f;
	pci_conf[0xaa] = 0x00;
	pci_conf[0xab] = 0x00;
	pci_conf[0xac] = 0x00;
	pci_conf[0xae] = 0x00;

	memset(d->pci_irq_levels, 0, sizeof(d->pci_irq_levels));
	}

	static const VMStateDescription vmstate_piix3 = {
	.name = "PIIX3",
	.version_id = 3,
	.minimum_version_id = 2,
	.minimum_version_id_old = 2,
	.fields = (VMStateField []) {
	VMSTATE_PCI_DEVICE(dev, PIIX3State),
	VMSTATE_INT32_ARRAY_V(pci_irq_levels, PIIX3State, 4, 3),
	VMSTATE_END_OF_LIST()
	}
	};

	static int piix3_initfn(PCIDevice *dev)
	{
	PIIX3State *d = DO_UPCAST(PIIX3State, dev, dev);
	uint8_t *pci_conf;

	isa_bus_new(&d->dev.qdev);

	pci_conf = d->dev.config;
	pci_config_set_vendor_id(pci_conf, PCI_VENDOR_ID_INTEL);
	pci_config_set_device_id(pci_conf, PCI_DEVICE_ID_INTEL_82371SB_0); // 82371SB PIIX3 PCI-to-ISA bridge (Step A1)
	pci_config_set_class(pci_conf, PCI_CLASS_BRIDGE_ISA);
	pci_conf[PCI_HEADER_TYPE] =
	PCI_HEADER_TYPE_NORMAL \| PCI_HEADER_TYPE_MULTI_FUNCTION; // header_type = PCI_multifunction, generic

	qemu_register_reset(piix3_reset, d);
	return 0;
	}

	static PCIDeviceInfo i440fx_info[] = {
	{
	.qdev.name = "i440FX",
	.qdev.desc = "Host bridge",
	.qdev.size = sizeof(PCII440FXState),
	.qdev.vmsd = &vmstate_i440fx,
	.qdev.no_user = 1,
	.init = i440fx_initfn,
	.config_write = i440fx_write_config,
	},{
	.qdev.name = "PIIX3",
	.qdev.desc = "ISA bridge",
	.qdev.size = sizeof(PIIX3State),
	.qdev.vmsd = &vmstate_piix3,
	.qdev.no_user = 1,
	.init = piix3_initfn,
	},{
	/* end of list */
	}
	};

	static SysBusDeviceInfo i440fx_pcihost_info = {
	.init = i440fx_pcihost_initfn,
	.qdev.name = "i440FX-pcihost",
	.qdev.size = sizeof(I440FXState),
	.qdev.no_user = 1,
	};

	static void i440fx_register(void)
	{
	sysbus_register_withprop(&i440fx_pcihost_info);
	pci_qdev_register_many(i440fx_info);
	}
	device_init(i440fx_register);