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"

 typedef uint32_t pci_addr_t;
 #include "pci_host.h"

 typedef PCIHostState I440FXState;

 static void i440fx_addr_writel(void* opaque, uint32_t addr, uint32_t val)
 {
     I440FXState *s = opaque;
     s->config_reg = val;
 }

 static uint32_t i440fx_addr_readl(void* opaque, uint32_t addr)
 {
     I440FXState *s = opaque;
     return s->config_reg;
 }

 static void piix3_set_irq(qemu_irq *pic, 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 uint32_t isa_page_descs[384 / 4];
 static uint8_t smm_enabled;

 static void update_pam(PCIDevice *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,
                                          isa_page_descs[(addr - 0xa0000) >> 12]);
         }
         break;
     }
 }

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

     update_pam(d, 0xf0000, 0x100000, (d->config[0x59] >> 4) & 3);
     for(i = 0; i < 12; i++) {
         r = (d->config[(i >> 1) + 0x5a] >> ((i & 1) * 4)) & 3;
         update_pam(d, 0xc0000 + 0x4000 * i, 0xc0000 + 0x4000 * (i + 1), r);
     }
     smram = d->config[0x72];
     if ((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,
                                          isa_page_descs[(addr - 0xa0000) >> 12]);
         }
     }
 }

 void i440fx_set_smm(PCIDevice *d, int val)
 {
     val = (val != 0);
     if (smm_enabled != val) {
         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(PCIDevice *d)
 {
     int i;
     for(i = 0; i < 96; i++) {
         isa_page_descs[i] = cpu_get_physical_page_desc(0xa0000 + i * 0x1000);
     }
 }

 static void i440fx_write_config(PCIDevice *d,
                                 uint32_t address, uint32_t val, int len)
 {
     /* XXX: implement SMRAM.D_LOCK */
     pci_default_write_config(d, address, val, len);
     if ((address >= 0x59 && address <= 0x5f) || address == 0x72)
         i440fx_update_memory_mappings(d);
 }

 static void i440fx_save(QEMUFile* f, void *opaque)
 {
     PCIDevice *d = opaque;
     pci_device_save(d, f);
     qemu_put_8s(f, &smm_enabled);
 }

 static int i440fx_load(QEMUFile* f, void *opaque, int version_id)
 {
     PCIDevice *d = opaque;
     int ret;

     if (version_id != 1)
         return -EINVAL;
     ret = pci_device_load(d, f);
     if (ret < 0)
         return ret;
     i440fx_update_memory_mappings(d);
     qemu_get_8s(f, &smm_enabled);
     return 0;
 }

 PCIBus *i440fx_init(PCIDevice **pi440fx_state, qemu_irq *pic)
 {
     PCIBus *b;
     PCIDevice *d;
     I440FXState *s;

     s = qemu_mallocz(sizeof(I440FXState));
     b = pci_register_bus(piix3_set_irq, pci_slot_get_pirq, pic, 0, 4);
     s->bus = b;

     register_ioport_write(0xcf8, 4, 4, i440fx_addr_writel, s);
     register_ioport_read(0xcf8, 4, 4, i440fx_addr_readl, s);

     register_ioport_write(0xcfc, 4, 1, pci_host_data_writeb, s);
     register_ioport_write(0xcfc, 4, 2, pci_host_data_writew, s);
     register_ioport_write(0xcfc, 4, 4, pci_host_data_writel, s);
     register_ioport_read(0xcfc, 4, 1, pci_host_data_readb, s);
     register_ioport_read(0xcfc, 4, 2, pci_host_data_readw, s);
     register_ioport_read(0xcfc, 4, 4, pci_host_data_readl, s);

     d = pci_register_device(b, "i440FX", sizeof(PCIDevice), 0,
                             NULL, i440fx_write_config);

     d->config[0x00] = 0x86; // vendor_id
     d->config[0x01] = 0x80;
     d->config[0x02] = 0x37; // device_id
     d->config[0x03] = 0x12;
     d->config[0x08] = 0x02; // revision
     d->config[0x0a] = 0x00; // class_sub = host2pci
     d->config[0x0b] = 0x06; // class_base = PCI_bridge
     d->config[0x0e] = 0x00; // header_type

     d->config[0x72] = 0x02; /* SMRAM */

     register_savevm("I440FX", 0, 1, i440fx_save, i440fx_load, d);
     *pi440fx_state = d;
     return b;
 }

 /* PIIX3 PCI to ISA bridge */

 PCIDevice *piix3_dev;
 PCIDevice *piix4_dev;

 /* just used for simpler irq handling. */
 #define PCI_IRQ_WORDS   ((PCI_DEVICES_MAX + 31) / 32)

 static int pci_irq_levels[4];

 static void piix3_set_irq(qemu_irq *pic, int irq_num, int level)
 {
     int i, pic_irq, pic_level;

     piix3_dev->config[0x60 + irq_num] &= ~0x80;   // enable bit
     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 |= pci_irq_levels[i];
         }
         qemu_set_irq(pic[pic_irq], pic_level);
     }
 }

 static void piix3_reset(PCIDevice *d)
 {
     uint8_t *pci_conf = d->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[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;
 }

 static void piix4_reset(PCIDevice *d)
 {
     uint8_t *pci_conf = d->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] = 0x0a; // PCI A -> IRQ 10
     pci_conf[0x61] = 0x0a; // PCI B -> IRQ 10
     pci_conf[0x62] = 0x0b; // PCI C -> IRQ 11
     pci_conf[0x63] = 0x0b; // PCI D -> IRQ 11
     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;
 }

 static void piix_save(QEMUFile* f, void *opaque)
 {
     PCIDevice *d = opaque;
     pci_device_save(d, f);
 }

 static int piix_load(QEMUFile* f, void *opaque, int version_id)
 {
     PCIDevice *d = opaque;
     if (version_id != 2)
         return -EINVAL;
     return pci_device_load(d, f);
 }

 int piix_init(PCIBus *bus, int devfn)
 {
     PCIDevice *d;
     uint8_t *pci_conf;

     d = pci_register_device(bus, "PIIX", sizeof(PCIDevice),
                                     devfn, NULL, NULL);
     register_savevm("PIIX", 0, 2, piix_save, piix_load, d);

     piix3_dev = d;
     pci_conf = d->config;

     pci_conf[0x00] = 0x86; // Intel
     pci_conf[0x01] = 0x80;
     pci_conf[0x02] = 0x2E; // 82371FB PIIX PCI-to-ISA bridge
     pci_conf[0x03] = 0x12;
     pci_conf[0x08] = 0x02; // Step A1
     pci_conf[0x0a] = 0x01; // class_sub = PCI_ISA
     pci_conf[0x0b] = 0x06; // class_base = PCI_bridge
     pci_conf[0x0e] = 0x80; // header_type = PCI_multifunction, generic

     piix3_reset(d);
     return d->devfn;
 }

 int piix3_init(PCIBus *bus, int devfn)
 {
     PCIDevice *d;
     uint8_t *pci_conf;

     d = pci_register_device(bus, "PIIX3", sizeof(PCIDevice),
                                     devfn, NULL, NULL);
     register_savevm("PIIX3", 0, 2, piix_save, piix_load, d);

     piix3_dev = d;
     pci_conf = d->config;

     pci_conf[0x00] = 0x86; // Intel
     pci_conf[0x01] = 0x80;
     pci_conf[0x02] = 0x00; // 82371SB PIIX3 PCI-to-ISA bridge (Step A1)
     pci_conf[0x03] = 0x70;
     pci_conf[0x0a] = 0x01; // class_sub = PCI_ISA
     pci_conf[0x0b] = 0x06; // class_base = PCI_bridge
     pci_conf[0x0e] = 0x80; // header_type = PCI_multifunction, generic

     piix3_reset(d);
     return d->devfn;
 }

 int piix4_init(PCIBus *bus, int devfn)
 {
     PCIDevice *d;
     uint8_t *pci_conf;

     d = pci_register_device(bus, "PIIX4", sizeof(PCIDevice),
                                     devfn, NULL, NULL);
     register_savevm("PIIX4", 0, 2, piix_save, piix_load, d);

     piix4_dev = d;
     pci_conf = d->config;

     pci_conf[0x00] = 0x86; // Intel
     pci_conf[0x01] = 0x80;
     pci_conf[0x02] = 0x10; // 82371AB/EB/MB PIIX4 PCI-to-ISA bridge
     pci_conf[0x03] = 0x71;
     pci_conf[0x0a] = 0x01; // class_sub = PCI_ISA
     pci_conf[0x0b] = 0x06; // class_base = PCI_bridge
     pci_conf[0x0e] = 0x80; // header_type = PCI_multifunction, generic

     piix4_reset(d);
     return d->devfn;
 }
	/*
	* 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"

	typedef uint32_t pci_addr_t;
	#include "pci_host.h"

	typedef PCIHostState I440FXState;

	static void i440fx_addr_writel(void* opaque, uint32_t addr, uint32_t val)
	{
	I440FXState *s = opaque;
	s->config_reg = val;
	}

	static uint32_t i440fx_addr_readl(void* opaque, uint32_t addr)
	{
	I440FXState *s = opaque;
	return s->config_reg;
	}

	static void piix3_set_irq(qemu_irq *pic, 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 uint32_t isa_page_descs[384 / 4];
	static uint8_t smm_enabled;

	static void update_pam(PCIDevice *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,
	isa_page_descs[(addr - 0xa0000) >> 12]);
	}
	break;
	}
	}

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

	update_pam(d, 0xf0000, 0x100000, (d->config[0x59] >> 4) & 3);
	for(i = 0; i < 12; i++) {
	r = (d->config[(i >> 1) + 0x5a] >> ((i & 1) * 4)) & 3;
	update_pam(d, 0xc0000 + 0x4000 * i, 0xc0000 + 0x4000 * (i + 1), r);
	}
	smram = d->config[0x72];
	if ((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,
	isa_page_descs[(addr - 0xa0000) >> 12]);
	}
	}
	}

	void i440fx_set_smm(PCIDevice *d, int val)
	{
	val = (val != 0);
	if (smm_enabled != val) {
	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(PCIDevice *d)
	{
	int i;
	for(i = 0; i < 96; i++) {
	isa_page_descs[i] = cpu_get_physical_page_desc(0xa0000 + i * 0x1000);
	}
	}

	static void i440fx_write_config(PCIDevice *d,
	uint32_t address, uint32_t val, int len)
	{
	/* XXX: implement SMRAM.D_LOCK */
	pci_default_write_config(d, address, val, len);
	if ((address >= 0x59 && address <= 0x5f) \|\| address == 0x72)
	i440fx_update_memory_mappings(d);
	}

	static void i440fx_save(QEMUFile* f, void *opaque)
	{
	PCIDevice *d = opaque;
	pci_device_save(d, f);
	qemu_put_8s(f, &smm_enabled);
	}

	static int i440fx_load(QEMUFile* f, void *opaque, int version_id)
	{
	PCIDevice *d = opaque;
	int ret;

	if (version_id != 1)
	return -EINVAL;
	ret = pci_device_load(d, f);
	if (ret < 0)
	return ret;
	i440fx_update_memory_mappings(d);
	qemu_get_8s(f, &smm_enabled);
	return 0;
	}

	PCIBus i440fx_init(PCIDevice pi440fx_state, qemu_irq pic)
	{
	PCIBus *b;
	PCIDevice *d;
	I440FXState *s;

	s = qemu_mallocz(sizeof(I440FXState));
	b = pci_register_bus(piix3_set_irq, pci_slot_get_pirq, pic, 0, 4);
	s->bus = b;

	register_ioport_write(0xcf8, 4, 4, i440fx_addr_writel, s);
	register_ioport_read(0xcf8, 4, 4, i440fx_addr_readl, s);

	register_ioport_write(0xcfc, 4, 1, pci_host_data_writeb, s);
	register_ioport_write(0xcfc, 4, 2, pci_host_data_writew, s);
	register_ioport_write(0xcfc, 4, 4, pci_host_data_writel, s);
	register_ioport_read(0xcfc, 4, 1, pci_host_data_readb, s);
	register_ioport_read(0xcfc, 4, 2, pci_host_data_readw, s);
	register_ioport_read(0xcfc, 4, 4, pci_host_data_readl, s);

	d = pci_register_device(b, "i440FX", sizeof(PCIDevice), 0,
	NULL, i440fx_write_config);

	d->config[0x00] = 0x86; // vendor_id
	d->config[0x01] = 0x80;
	d->config[0x02] = 0x37; // device_id
	d->config[0x03] = 0x12;
	d->config[0x08] = 0x02; // revision
	d->config[0x0a] = 0x00; // class_sub = host2pci
	d->config[0x0b] = 0x06; // class_base = PCI_bridge
	d->config[0x0e] = 0x00; // header_type

	d->config[0x72] = 0x02; /* SMRAM */

	register_savevm("I440FX", 0, 1, i440fx_save, i440fx_load, d);
	*pi440fx_state = d;
	return b;
	}

	/* PIIX3 PCI to ISA bridge */

	PCIDevice *piix3_dev;
	PCIDevice *piix4_dev;

	/* just used for simpler irq handling. */
	#define PCI_IRQ_WORDS ((PCI_DEVICES_MAX + 31) / 32)

	static int pci_irq_levels[4];

	static void piix3_set_irq(qemu_irq *pic, int irq_num, int level)
	{
	int i, pic_irq, pic_level;

	piix3_dev->config[0x60 + irq_num] &= ~0x80; // enable bit
	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 \|= pci_irq_levels[i];
	}
	qemu_set_irq(pic[pic_irq], pic_level);
	}
	}

	static void piix3_reset(PCIDevice *d)
	{
	uint8_t *pci_conf = d->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[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;
	}

	static void piix4_reset(PCIDevice *d)
	{
	uint8_t *pci_conf = d->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] = 0x0a; // PCI A -> IRQ 10
	pci_conf[0x61] = 0x0a; // PCI B -> IRQ 10
	pci_conf[0x62] = 0x0b; // PCI C -> IRQ 11
	pci_conf[0x63] = 0x0b; // PCI D -> IRQ 11
	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;
	}

	static void piix_save(QEMUFile* f, void *opaque)
	{
	PCIDevice *d = opaque;
	pci_device_save(d, f);
	}

	static int piix_load(QEMUFile* f, void *opaque, int version_id)
	{
	PCIDevice *d = opaque;
	if (version_id != 2)
	return -EINVAL;
	return pci_device_load(d, f);
	}

	int piix_init(PCIBus *bus, int devfn)
	{
	PCIDevice *d;
	uint8_t *pci_conf;

	d = pci_register_device(bus, "PIIX", sizeof(PCIDevice),
	devfn, NULL, NULL);
	register_savevm("PIIX", 0, 2, piix_save, piix_load, d);

	piix3_dev = d;
	pci_conf = d->config;

	pci_conf[0x00] = 0x86; // Intel
	pci_conf[0x01] = 0x80;
	pci_conf[0x02] = 0x2E; // 82371FB PIIX PCI-to-ISA bridge
	pci_conf[0x03] = 0x12;
	pci_conf[0x08] = 0x02; // Step A1
	pci_conf[0x0a] = 0x01; // class_sub = PCI_ISA
	pci_conf[0x0b] = 0x06; // class_base = PCI_bridge
	pci_conf[0x0e] = 0x80; // header_type = PCI_multifunction, generic

	piix3_reset(d);
	return d->devfn;
	}

	int piix3_init(PCIBus *bus, int devfn)
	{
	PCIDevice *d;
	uint8_t *pci_conf;

	d = pci_register_device(bus, "PIIX3", sizeof(PCIDevice),
	devfn, NULL, NULL);
	register_savevm("PIIX3", 0, 2, piix_save, piix_load, d);

	piix3_dev = d;
	pci_conf = d->config;

	pci_conf[0x00] = 0x86; // Intel
	pci_conf[0x01] = 0x80;
	pci_conf[0x02] = 0x00; // 82371SB PIIX3 PCI-to-ISA bridge (Step A1)
	pci_conf[0x03] = 0x70;
	pci_conf[0x0a] = 0x01; // class_sub = PCI_ISA
	pci_conf[0x0b] = 0x06; // class_base = PCI_bridge
	pci_conf[0x0e] = 0x80; // header_type = PCI_multifunction, generic

	piix3_reset(d);
	return d->devfn;
	}

	int piix4_init(PCIBus *bus, int devfn)
	{
	PCIDevice *d;
	uint8_t *pci_conf;

	d = pci_register_device(bus, "PIIX4", sizeof(PCIDevice),
	devfn, NULL, NULL);
	register_savevm("PIIX4", 0, 2, piix_save, piix_load, d);

	piix4_dev = d;
	pci_conf = d->config;

	pci_conf[0x00] = 0x86; // Intel
	pci_conf[0x01] = 0x80;
	pci_conf[0x02] = 0x10; // 82371AB/EB/MB PIIX4 PCI-to-ISA bridge
	pci_conf[0x03] = 0x71;
	pci_conf[0x0a] = 0x01; // class_sub = PCI_ISA
	pci_conf[0x0b] = 0x06; // class_base = PCI_bridge
	pci_conf[0x0e] = 0x80; // header_type = PCI_multifunction, generic

	piix4_reset(d);
	return d->devfn;
	}