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qemu-e2k/hw/pci.c
bellard 63ce9e0a42 pci empty device read fix - piix3 ide init 
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@854 c046a42c-6fe2-441c-8c8c-71466251a162
2004-05-23 19:12:03 +00:00

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22 KiB
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/*
* QEMU PCI bus manager
*
* Copyright (c) 2004 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 "vl.h"
//#define DEBUG_PCI
#define PCI_VENDOR_ID 0x00 /* 16 bits */
#define PCI_DEVICE_ID 0x02 /* 16 bits */
#define PCI_COMMAND 0x04 /* 16 bits */
#define PCI_COMMAND_IO 0x1 /* Enable response in I/O space */
#define PCI_COMMAND_MEMORY 0x2 /* Enable response in Memory space */
#define PCI_CLASS_DEVICE 0x0a /* Device class */
#define PCI_INTERRUPT_LINE 0x3c /* 8 bits */
#define PCI_INTERRUPT_PIN 0x3d /* 8 bits */
#define PCI_MIN_GNT 0x3e /* 8 bits */
#define PCI_MAX_LAT 0x3f /* 8 bits */
/* just used for simpler irq handling. */
#define PCI_DEVICES_MAX 64
#define PCI_IRQ_WORDS ((PCI_DEVICES_MAX + 31) / 32)
typedef struct PCIBridge {
uint32_t config_reg;
PCIDevice **pci_bus[256];
} PCIBridge;
static PCIBridge pci_bridge;
target_phys_addr_t pci_mem_base;
static int pci_irq_index;
static uint32_t pci_irq_levels[4][PCI_IRQ_WORDS];
/* -1 for devfn means auto assign */
PCIDevice *pci_register_device(const char *name, int instance_size,
int bus_num, int devfn,
PCIConfigReadFunc *config_read,
PCIConfigWriteFunc *config_write)
{
PCIBridge *s = &pci_bridge;
PCIDevice *pci_dev, **bus;
if (pci_irq_index >= PCI_DEVICES_MAX)
return NULL;
if (!s->pci_bus[bus_num]) {
s->pci_bus[bus_num] = qemu_mallocz(256 * sizeof(PCIDevice *));
if (!s->pci_bus[bus_num])
return NULL;
}
bus = s->pci_bus[bus_num];
if (devfn < 0) {
for(devfn = 0 ; devfn < 256; devfn += 8) {
if (!bus[devfn])
goto found;
}
return NULL;
found: ;
}
pci_dev = qemu_mallocz(instance_size);
if (!pci_dev)
return NULL;
pci_dev->bus_num = bus_num;
pci_dev->devfn = devfn;
pstrcpy(pci_dev->name, sizeof(pci_dev->name), name);
if (!config_read)
config_read = pci_default_read_config;
if (!config_write)
config_write = pci_default_write_config;
pci_dev->config_read = config_read;
pci_dev->config_write = config_write;
pci_dev->irq_index = pci_irq_index++;
bus[devfn] = pci_dev;
return pci_dev;
}
void pci_register_io_region(PCIDevice *pci_dev, int region_num,
uint32_t size, int type,
PCIMapIORegionFunc *map_func)
{
PCIIORegion *r;
if ((unsigned int)region_num >= 6)
return;
r = &pci_dev->io_regions[region_num];
r->addr = -1;
r->size = size;
r->type = type;
r->map_func = map_func;
}
static void pci_addr_writel(void* opaque, uint32_t addr, uint32_t val)
{
PCIBridge *s = opaque;
s->config_reg = val;
}
static uint32_t pci_addr_readl(void* opaque, uint32_t addr)
{
PCIBridge *s = opaque;
return s->config_reg;
}
static void pci_update_mappings(PCIDevice *d)
{
PCIIORegion *r;
int cmd, i;
uint32_t last_addr, new_addr;
cmd = le16_to_cpu(*(uint16_t *)(d->config + PCI_COMMAND));
for(i = 0; i < 6; i++) {
r = &d->io_regions[i];
if (r->size != 0) {
if (r->type & PCI_ADDRESS_SPACE_IO) {
if (cmd & PCI_COMMAND_IO) {
new_addr = le32_to_cpu(*(uint32_t *)(d->config +
0x10 + i * 4));
new_addr = new_addr & ~(r->size - 1);
last_addr = new_addr + r->size - 1;
/* NOTE: we have only 64K ioports on PC */
if (last_addr <= new_addr || new_addr == 0 ||
last_addr >= 0x10000) {
new_addr = -1;
}
} else {
new_addr = -1;
}
} else {
if (cmd & PCI_COMMAND_MEMORY) {
new_addr = le32_to_cpu(*(uint32_t *)(d->config +
0x10 + i * 4));
new_addr = new_addr & ~(r->size - 1);
last_addr = new_addr + r->size - 1;
/* NOTE: we do not support wrapping */
/* XXX: as we cannot support really dynamic
mappings, we handle specific values as invalid
mappings. */
if (last_addr <= new_addr || new_addr == 0 ||
last_addr == -1) {
new_addr = -1;
}
} else {
new_addr = -1;
}
}
/* now do the real mapping */
if (new_addr != r->addr) {
if (r->addr != -1) {
if (r->type & PCI_ADDRESS_SPACE_IO) {
int class;
/* NOTE: specific hack for IDE in PC case:
only one byte must be mapped. */
class = d->config[0x0a] | (d->config[0x0b] << 8);
if (class == 0x0101 && r->size == 4) {
isa_unassign_ioport(r->addr + 2, 1);
} else {
isa_unassign_ioport(r->addr, r->size);
}
} else {
cpu_register_physical_memory(r->addr + pci_mem_base,
r->size,
IO_MEM_UNASSIGNED);
}
}
r->addr = new_addr;
if (r->addr != -1) {
r->map_func(d, i, r->addr, r->size, r->type);
}
}
}
}
}
uint32_t pci_default_read_config(PCIDevice *d,
uint32_t address, int len)
{
uint32_t val;
switch(len) {
case 1:
val = d->config[address];
break;
case 2:
val = le16_to_cpu(*(uint16_t *)(d->config + address));
break;
default:
case 4:
val = le32_to_cpu(*(uint32_t *)(d->config + address));
break;
}
return val;
}
void pci_default_write_config(PCIDevice *d,
uint32_t address, uint32_t val, int len)
{
int can_write, i;
uint32_t end, addr;
if (len == 4 && (address >= 0x10 && address < 0x10 + 4 * 6)) {
PCIIORegion *r;
int reg;
reg = (address - 0x10) >> 2;
r = &d->io_regions[reg];
if (r->size == 0)
goto default_config;
/* compute the stored value */
val &= ~(r->size - 1);
val |= r->type;
*(uint32_t *)(d->config + 0x10 + reg * 4) = cpu_to_le32(val);
pci_update_mappings(d);
return;
}
default_config:
/* not efficient, but simple */
addr = address;
for(i = 0; i < len; i++) {
/* default read/write accesses */
switch(addr) {
case 0x00:
case 0x01:
case 0x02:
case 0x03:
case 0x08:
case 0x09:
case 0x0a:
case 0x0b:
case 0x0e:
case 0x3d:
can_write = 0;
break;
default:
can_write = 1;
break;
}
if (can_write) {
d->config[addr] = val;
}
addr++;
val >>= 8;
}
end = address + len;
if (end > PCI_COMMAND && address < (PCI_COMMAND + 2)) {
/* if the command register is modified, we must modify the mappings */
pci_update_mappings(d);
}
}
static void pci_data_write(void *opaque, uint32_t addr,
uint32_t val, int len)
{
PCIBridge *s = opaque;
PCIDevice **bus, *pci_dev;
int config_addr;
#if defined(DEBUG_PCI) && 0
printf("pci_data_write: addr=%08x val=%08x len=%d\n",
s->config_reg, val, len);
#endif
if (!(s->config_reg & (1 << 31))) {
return;
}
if ((s->config_reg & 0x3) != 0) {
return;
}
bus = s->pci_bus[(s->config_reg >> 16) & 0xff];
if (!bus)
return;
pci_dev = bus[(s->config_reg >> 8) & 0xff];
if (!pci_dev)
return;
config_addr = (s->config_reg & 0xfc) | (addr & 3);
#if defined(DEBUG_PCI)
printf("pci_config_write: %s: addr=%02x val=%08x len=%d\n",
pci_dev->name, config_addr, val, len);
#endif
pci_dev->config_write(pci_dev, config_addr, val, len);
}
static uint32_t pci_data_read(void *opaque, uint32_t addr,
int len)
{
PCIBridge *s = opaque;
PCIDevice **bus, *pci_dev;
int config_addr;
uint32_t val;
if (!(s->config_reg & (1 << 31)))
goto fail;
if ((s->config_reg & 0x3) != 0)
goto fail;
bus = s->pci_bus[(s->config_reg >> 16) & 0xff];
if (!bus)
goto fail;
pci_dev = bus[(s->config_reg >> 8) & 0xff];
if (!pci_dev) {
fail:
switch(len) {
case 1:
val = 0xff;
break;
case 2:
val = 0xffff;
break;
default:
case 4:
val = 0xffffffff;
break;
}
goto the_end;
}
config_addr = (s->config_reg & 0xfc) | (addr & 3);
val = pci_dev->config_read(pci_dev, config_addr, len);
#if defined(DEBUG_PCI)
printf("pci_config_read: %s: addr=%02x val=%08x len=%d\n",
pci_dev->name, config_addr, val, len);
#endif
the_end:
#if defined(DEBUG_PCI) && 0
printf("pci_data_read: addr=%08x val=%08x len=%d\n",
s->config_reg, val, len);
#endif
return val;
}
static void pci_data_writeb(void* opaque, uint32_t addr, uint32_t val)
{
pci_data_write(opaque, addr, val, 1);
}
static void pci_data_writew(void* opaque, uint32_t addr, uint32_t val)
{
pci_data_write(opaque, addr, val, 2);
}
static void pci_data_writel(void* opaque, uint32_t addr, uint32_t val)
{
pci_data_write(opaque, addr, val, 4);
}
static uint32_t pci_data_readb(void* opaque, uint32_t addr)
{
return pci_data_read(opaque, addr, 1);
}
static uint32_t pci_data_readw(void* opaque, uint32_t addr)
{
return pci_data_read(opaque, addr, 2);
}
static uint32_t pci_data_readl(void* opaque, uint32_t addr)
{
return pci_data_read(opaque, addr, 4);
}
/* i440FX PCI bridge */
void i440fx_init(void)
{
PCIBridge *s = &pci_bridge;
PCIDevice *d;
register_ioport_write(0xcf8, 4, 4, pci_addr_writel, s);
register_ioport_read(0xcf8, 4, 4, pci_addr_readl, s);
register_ioport_write(0xcfc, 4, 1, pci_data_writeb, s);
register_ioport_write(0xcfc, 4, 2, pci_data_writew, s);
register_ioport_write(0xcfc, 4, 4, pci_data_writel, s);
register_ioport_read(0xcfc, 4, 1, pci_data_readb, s);
register_ioport_read(0xcfc, 4, 2, pci_data_readw, s);
register_ioport_read(0xcfc, 4, 4, pci_data_readl, s);
d = pci_register_device("i440FX", sizeof(PCIDevice), 0, 0,
NULL, NULL);
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] = 0x04; // class_sub = pci2pci
d->config[0x0b] = 0x06; // class_base = PCI_bridge
d->config[0x0c] = 0x01; // line_size in 32 bit words
d->config[0x0e] = 0x01; // header_type
}
/* PIIX3 PCI to ISA bridge */
typedef struct PIIX3State {
PCIDevice dev;
} PIIX3State;
PIIX3State *piix3_state;
static void piix3_reset(PIIX3State *d)
{
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[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[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;
}
void piix3_init(void)
{
PIIX3State *d;
uint8_t *pci_conf;
d = (PIIX3State *)pci_register_device("PIIX3", sizeof(PIIX3State),
0, -1,
NULL, NULL);
piix3_state = d;
pci_conf = d->dev.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);
}
/***********************************************************/
/* generic PCI irq support */
/* 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 inline int pci_slot_get_pirq(PCIDevice *pci_dev, int irq_num)
{
int slot_addend;
slot_addend = (pci_dev->devfn >> 3);
return (irq_num + slot_addend) & 3;
}
/* 0 <= irq_num <= 3. level must be 0 or 1 */
void pci_set_irq(PCIDevice *pci_dev, int irq_num, int level)
{
int irq_index, shift, pic_irq, pic_level;
uint32_t *p;
irq_num = pci_slot_get_pirq(pci_dev, irq_num);
irq_index = pci_dev->irq_index;
p = &pci_irq_levels[irq_num][irq_index >> 5];
shift = (irq_index & 0x1f);
*p = (*p & ~(1 << shift)) | (level << shift);
/* now we change the pic irq level according to the piix irq mappings */
pic_irq = piix3_state->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;
#if (PCI_IRQ_WORDS == 2)
pic_level = ((pci_irq_levels[irq_num][0] |
pci_irq_levels[irq_num][1]) != 0);
#else
{
int i;
pic_level = 0;
for(i = 0; i < PCI_IRQ_WORDS; i++) {
if (pci_irq_levels[irq_num][i]) {
pic_level = 1;
break;
}
}
}
#endif
pic_set_irq(pic_irq, pic_level);
}
}
/***********************************************************/
/* monitor info on PCI */
static void pci_info_device(PCIDevice *d)
{
int i, class;
PCIIORegion *r;
printf(" Bus %2d, device %3d, function %d:\n",
d->bus_num, d->devfn >> 3, d->devfn & 7);
class = le16_to_cpu(*((uint16_t *)(d->config + PCI_CLASS_DEVICE)));
printf(" ");
switch(class) {
case 0x0101:
printf("IDE controller");
break;
case 0x0200:
printf("Ethernet controller");
break;
case 0x0300:
printf("VGA controller");
break;
default:
printf("Class %04x", class);
break;
}
printf(": PCI device %04x:%04x\n",
le16_to_cpu(*((uint16_t *)(d->config + PCI_VENDOR_ID))),
le16_to_cpu(*((uint16_t *)(d->config + PCI_DEVICE_ID))));
if (d->config[PCI_INTERRUPT_PIN] != 0) {
printf(" IRQ %d.\n", d->config[PCI_INTERRUPT_LINE]);
}
for(i = 0;i < 6; i++) {
r = &d->io_regions[i];
if (r->size != 0) {
printf(" BAR%d: ", i);
if (r->type & PCI_ADDRESS_SPACE_IO) {
printf("I/O at 0x%04x [0x%04x].\n",
r->addr, r->addr + r->size - 1);
} else {
printf("32 bit memory at 0x%08x [0x%08x].\n",
r->addr, r->addr + r->size - 1);
}
}
}
}
void pci_info(void)
{
PCIBridge *s = &pci_bridge;
PCIDevice **bus;
int bus_num, devfn;
for(bus_num = 0; bus_num < 256; bus_num++) {
bus = s->pci_bus[bus_num];
if (bus) {
for(devfn = 0; devfn < 256; devfn++) {
if (bus[devfn])
pci_info_device(bus[devfn]);
}
}
}
}
/***********************************************************/
/* XXX: the following should be moved to the PC BIOS */
static uint32_t isa_inb(uint32_t addr)
{
return cpu_inb(cpu_single_env, addr);
}
static void isa_outb(uint32_t val, uint32_t addr)
{
cpu_outb(cpu_single_env, addr, val);
}
static uint32_t isa_inw(uint32_t addr)
{
return cpu_inw(cpu_single_env, addr);
}
static void isa_outw(uint32_t val, uint32_t addr)
{
cpu_outw(cpu_single_env, addr, val);
}
static uint32_t isa_inl(uint32_t addr)
{
return cpu_inl(cpu_single_env, addr);
}
static void isa_outl(uint32_t val, uint32_t addr)
{
cpu_outl(cpu_single_env, addr, val);
}
static void pci_config_writel(PCIDevice *d, uint32_t addr, uint32_t val)
{
PCIBridge *s = &pci_bridge;
s->config_reg = 0x80000000 | (d->bus_num << 16) |
(d->devfn << 8) | addr;
pci_data_write(s, 0, val, 4);
}
static void pci_config_writew(PCIDevice *d, uint32_t addr, uint32_t val)
{
PCIBridge *s = &pci_bridge;
s->config_reg = 0x80000000 | (d->bus_num << 16) |
(d->devfn << 8) | (addr & ~3);
pci_data_write(s, addr & 3, val, 2);
}
static void pci_config_writeb(PCIDevice *d, uint32_t addr, uint32_t val)
{
PCIBridge *s = &pci_bridge;
s->config_reg = 0x80000000 | (d->bus_num << 16) |
(d->devfn << 8) | (addr & ~3);
pci_data_write(s, addr & 3, val, 1);
}
static uint32_t pci_config_readl(PCIDevice *d, uint32_t addr)
{
PCIBridge *s = &pci_bridge;
s->config_reg = 0x80000000 | (d->bus_num << 16) |
(d->devfn << 8) | addr;
return pci_data_read(s, 0, 4);
}
static uint32_t pci_config_readw(PCIDevice *d, uint32_t addr)
{
PCIBridge *s = &pci_bridge;
s->config_reg = 0x80000000 | (d->bus_num << 16) |
(d->devfn << 8) | (addr & ~3);
return pci_data_read(s, addr & 3, 2);
}
static uint32_t pci_config_readb(PCIDevice *d, uint32_t addr)
{
PCIBridge *s = &pci_bridge;
s->config_reg = 0x80000000 | (d->bus_num << 16) |
(d->devfn << 8) | (addr & ~3);
return pci_data_read(s, addr & 3, 1);
}
static uint32_t pci_bios_io_addr;
static uint32_t pci_bios_mem_addr;
/* host irqs corresponding to PCI irqs A-D */
static uint8_t pci_irqs[4] = { 11, 9, 11, 9 };
static void pci_set_io_region_addr(PCIDevice *d, int region_num, uint32_t addr)
{
PCIIORegion *r;
uint16_t cmd;
pci_config_writel(d, 0x10 + region_num * 4, addr);
r = &d->io_regions[region_num];
/* enable memory mappings */
cmd = pci_config_readw(d, PCI_COMMAND);
if (r->type & PCI_ADDRESS_SPACE_IO)
cmd |= 1;
else
cmd |= 2;
pci_config_writew(d, PCI_COMMAND, cmd);
}
static void pci_bios_init_device(PCIDevice *d)
{
int class;
PCIIORegion *r;
uint32_t *paddr;
int i, pin, pic_irq, vendor_id, device_id;
class = pci_config_readw(d, PCI_CLASS_DEVICE);
switch(class) {
case 0x0101:
vendor_id = pci_config_readw(d, PCI_VENDOR_ID);
device_id = pci_config_readw(d, PCI_DEVICE_ID);
if (vendor_id == 0x8086 && device_id == 0x7010) {
/* PIIX3 IDE */
pci_config_writew(d, PCI_COMMAND, PCI_COMMAND_IO);
pci_config_writew(d, 0x40, 0x8000); // enable IDE0
} else {
/* IDE: we map it as in ISA mode */
pci_set_io_region_addr(d, 0, 0x1f0);
pci_set_io_region_addr(d, 1, 0x3f4);
pci_set_io_region_addr(d, 2, 0x170);
pci_set_io_region_addr(d, 3, 0x374);
}
break;
case 0x0300:
/* VGA: map frame buffer to default Bochs VBE address */
pci_set_io_region_addr(d, 0, 0xE0000000);
break;
default:
/* default memory mappings */
for(i = 0; i < 6; i++) {
r = &d->io_regions[i];
if (r->size) {
if (r->type & PCI_ADDRESS_SPACE_IO)
paddr = &pci_bios_io_addr;
else
paddr = &pci_bios_mem_addr;
*paddr = (*paddr + r->size - 1) & ~(r->size - 1);
pci_set_io_region_addr(d, i, *paddr);
*paddr += r->size;
}
}
break;
}
/* map the interrupt */
pin = pci_config_readb(d, PCI_INTERRUPT_PIN);
if (pin != 0) {
pin = pci_slot_get_pirq(d, pin - 1);
pic_irq = pci_irqs[pin];
pci_config_writeb(d, PCI_INTERRUPT_LINE, pic_irq);
}
}
/*
* This function initializes the PCI devices as a normal PCI BIOS
* would do. It is provided just in case the BIOS has no support for
* PCI.
*/
void pci_bios_init(void)
{
PCIBridge *s = &pci_bridge;
PCIDevice **bus;
int bus_num, devfn, i, irq;
uint8_t elcr[2];
pci_bios_io_addr = 0xc000;
pci_bios_mem_addr = 0xf0000000;
/* activate IRQ mappings */
elcr[0] = 0x00;
elcr[1] = 0x00;
for(i = 0; i < 4; i++) {
irq = pci_irqs[i];
/* set to trigger level */
elcr[irq >> 3] |= (1 << (irq & 7));
/* activate irq remapping in PIIX */
pci_config_writeb((PCIDevice *)piix3_state, 0x60 + i, irq);
}
isa_outb(elcr[0], 0x4d0);
isa_outb(elcr[1], 0x4d1);
for(bus_num = 0; bus_num < 256; bus_num++) {
bus = s->pci_bus[bus_num];
if (bus) {
for(devfn = 0; devfn < 256; devfn++) {
if (bus[devfn])
pci_bios_init_device(bus[devfn]);
}
}
}
}
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