/*
* 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);
