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freebsd-skq/sys/i386/pci/pci_cfgreg.c
jhb dcec7e1907 New APIC support code: 
- The apic interrupt entry points have been rewritten so that each entry
  point can serve 32 different vectors.  When the entry is executed, it
  uses one of the 32-bit ISR registers to determine which vector in its
  assigned range was triggered.  Thus, the apic code can support 159
  different interrupt vectors with only 5 entry points.
- We now always to disable the local APIC to work around an errata in
  certain PPros and then re-enable it again if we decide to use the APICs
  to route interrupts.
- We no longer map IO APICs or local APICs using special page table
  entries.  Instead, we just use pmap_mapdev().  We also no longer
  export the virtual address of the local APIC as a global symbol to
  the rest of the system, but only in local_apic.c.  To aid this, the
  APIC ID of each CPU is exported as a per-CPU variable.
- Interrupt sources are provided for each intpin on each IO APIC.
  Currently, each source is given a unique interrupt vector meaning that
  PCI interrupts are not shared on most machines with an I/O APIC.
  That mapping for interrupt sources to interrupt vectors is up to the
  APIC enumerator driver however.
- We no longer probe to see if we need to use mixed mode to route IRQ 0,
  instead we always use mixed mode to route IRQ 0 for now.  This can be
  disabled via the 'NO_MIXED_MODE' kernel option.
- The npx(4) driver now always probes to see if a built-in FPU is present
  since this test can now be performed with the new APIC code.  However,
  an SMP kernel will panic if there is more than one CPU and a built-in
  FPU is not found.
- PCI interrupts are now properly routed when using APICs to route
  interrupts, so remove the hack to psuedo-route interrupts when the
  intpin register was read.
- The apic.h header was moved to apicreg.h and a new apicvar.h header
  that declares the APIs used by the new APIC code was added.
2003-11-03 21:53:38 +00:00

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/*
* Copyright (c) 1997, Stefan Esser <se@freebsd.org>
* Copyright (c) 2000, Michael Smith <msmith@freebsd.org>
* Copyright (c) 2000, BSDi
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice unmodified, this list of conditions, and the following
* disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h> /* XXX trim includes */
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/malloc.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/sysctl.h>
#include <vm/vm.h>
#include <vm/pmap.h>
#include <machine/md_var.h>
#include <dev/pci/pcivar.h>
#include <dev/pci/pcireg.h>
#include <isa/isavar.h>
#include <machine/pci_cfgreg.h>
#include <machine/segments.h>
#include <machine/pc/bios.h>
#include "pcib_if.h"
#define PRVERB(a) do { \
if (bootverbose) \
printf a ; \
} while(0)
static int cfgmech;
static int devmax;
static int pci_cfgintr_valid(struct PIR_entry *pe, int pin, int irq);
static int pci_cfgintr_unique(struct PIR_entry *pe, int pin);
static int pci_cfgintr_linked(struct PIR_entry *pe, int pin);
static int pci_cfgintr_search(struct PIR_entry *pe, int bus, int device, int matchpin, int pin);
static int pci_cfgintr_virgin(struct PIR_entry *pe, int pin);
static void pci_print_irqmask(u_int16_t irqs);
static void pci_print_route_table(struct PIR_table *prt, int size);
static int pcireg_cfgread(int bus, int slot, int func, int reg, int bytes);
static void pcireg_cfgwrite(int bus, int slot, int func, int reg, int data, int bytes);
static int pcireg_cfgopen(void);
static struct PIR_table *pci_route_table;
static int pci_route_count;
static struct mtx pcicfg_mtx;
/* sysctl vars */
SYSCTL_DECL(_hw_pci);
#ifdef PC98
#define PCI_IRQ_OVERRIDE_MASK 0x3e68
#else
#define PCI_IRQ_OVERRIDE_MASK 0xdef4
#endif
static uint32_t pci_irq_override_mask = PCI_IRQ_OVERRIDE_MASK;
TUNABLE_INT("hw.pci.irq_override_mask", &pci_irq_override_mask);
SYSCTL_INT(_hw_pci, OID_AUTO, irq_override_mask, CTLFLAG_RDTUN,
&pci_irq_override_mask, PCI_IRQ_OVERRIDE_MASK,
"Mask of allowed irqs to try to route when it has no good clue about\n"
"which irqs it should use.");
/*
* Some BIOS writers seem to want to ignore the spec and put
* 0 in the intline rather than 255 to indicate none. Some use
* numbers in the range 128-254 to indicate something strange and
* apparently undocumented anywhere. Assume these are completely bogus
* and map them to 255, which means "none".
*/
static __inline__ int
pci_i386_map_intline(int line)
{
if (line == 0 || line >= 128)
return (PCI_INVALID_IRQ);
return (line);
}
static u_int16_t
pcibios_get_version(void)
{
struct bios_regs args;
if (PCIbios.ventry == 0) {
PRVERB(("pcibios: No call entry point\n"));
return (0);
}
args.eax = PCIBIOS_BIOS_PRESENT;
if (bios32(&args, PCIbios.ventry, GSEL(GCODE_SEL, SEL_KPL))) {
PRVERB(("pcibios: BIOS_PRESENT call failed\n"));
return (0);
}
if (args.edx != 0x20494350) {
PRVERB(("pcibios: BIOS_PRESENT didn't return 'PCI ' in edx\n"));
return (0);
}
return (args.ebx & 0xffff);
}
/*
* Initialise access to PCI configuration space
*/
int
pci_cfgregopen(void)
{
static int opened = 0;
u_long sigaddr;
static struct PIR_table *pt;
u_int16_t v;
u_int8_t ck, *cv;
int i;
if (opened)
return(1);
if (pcireg_cfgopen() == 0)
return(0);
v = pcibios_get_version();
if (v > 0)
printf("pcibios: BIOS version %x.%02x\n", (v & 0xff00) >> 8,
v & 0xff);
/*
* Look for the interrupt routing table.
*
* We use PCI BIOS's PIR table if it's available $PIR is the
* standard way to do this. Sadly, some machines are not
* standards conforming and have _PIR instead. We shrug and cope
* by looking for both.
*/
if (pcibios_get_version() >= 0x0210 && pt == NULL) {
sigaddr = bios_sigsearch(0, "$PIR", 4, 16, 0);
if (sigaddr == 0)
sigaddr = bios_sigsearch(0, "_PIR", 4, 16, 0);
if (sigaddr != 0) {
pt = (struct PIR_table *)(uintptr_t)
BIOS_PADDRTOVADDR(sigaddr);
for (cv = (u_int8_t *)pt, ck = 0, i = 0;
i < (pt->pt_header.ph_length); i++) {
ck += cv[i];
}
if (ck == 0 && pt->pt_header.ph_length >
sizeof(struct PIR_header)) {
pci_route_table = pt;
pci_route_count = (pt->pt_header.ph_length -
sizeof(struct PIR_header)) /
sizeof(struct PIR_entry);
printf("Using $PIR table, %d entries at %p\n",
pci_route_count, pci_route_table);
if (bootverbose)
pci_print_route_table(pci_route_table,
pci_route_count);
}
}
}
mtx_init(&pcicfg_mtx, "pcicfg", NULL, MTX_SPIN);
opened = 1;
return(1);
}
/*
* Read configuration space register
*/
u_int32_t
pci_cfgregread(int bus, int slot, int func, int reg, int bytes)
{
uint32_t line;
/*
* Some BIOS writers seem to want to ignore the spec and put
* 0 in the intline rather than 255 to indicate none. The rest of
* the code uses 255 as an invalid IRQ.
*/
if (reg == PCIR_INTLINE && bytes == 1) {
line = pcireg_cfgread(bus, slot, func, PCIR_INTLINE, 1);
return (pci_i386_map_intline(line));
}
return (pcireg_cfgread(bus, slot, func, reg, bytes));
}
/*
* Write configuration space register
*/
void
pci_cfgregwrite(int bus, int slot, int func, int reg, u_int32_t data, int bytes)
{
pcireg_cfgwrite(bus, slot, func, reg, data, bytes);
}
/*
* Route a PCI interrupt
*/
int
pci_cfgintr(int bus, int device, int pin, int oldirq)
{
struct PIR_entry *pe;
int i, irq;
struct bios_regs args;
u_int16_t v;
int already = 0;
int errok = 0;
v = pcibios_get_version();
if (v < 0x0210) {
PRVERB((
"pci_cfgintr: BIOS %x.%02x doesn't support interrupt routing\n",
(v & 0xff00) >> 8, v & 0xff));
return (PCI_INVALID_IRQ);
}
if ((bus < 0) || (bus > 255) || (device < 0) || (device > 255) ||
(pin < 1) || (pin > 4))
return(PCI_INVALID_IRQ);
/*
* Scan the entry table for a contender
*/
for (i = 0, pe = &pci_route_table->pt_entry[0]; i < pci_route_count;
i++, pe++) {
if ((bus != pe->pe_bus) || (device != pe->pe_device))
continue;
/*
* A link of 0 means that this intpin is not connected to
* any other device's interrupt pins and is not connected to
* any of the Interrupt Router's interrupt pins, so we can't
* route it.
*/
if (pe->pe_intpin[pin - 1].link == 0)
continue;
if (pci_cfgintr_valid(pe, pin, oldirq)) {
printf("pci_cfgintr: %d:%d INT%c BIOS irq %d\n", bus,
device, 'A' + pin - 1, oldirq);
return (oldirq);
}
/*
* We try to find a linked interrupt, then we look to see
* if the interrupt is uniquely routed, then we look for
* a virgin interrupt. The virgin interrupt should return
* an interrupt we can route, but if that fails, maybe we
* should try harder to route a different interrupt.
* However, experience has shown that that's rarely the
* failure mode we see.
*/
irq = pci_cfgintr_linked(pe, pin);
if (irq != PCI_INVALID_IRQ)
already = 1;
if (irq == PCI_INVALID_IRQ) {
irq = pci_cfgintr_unique(pe, pin);
if (irq != PCI_INVALID_IRQ)
errok = 1;
}
if (irq == PCI_INVALID_IRQ)
irq = pci_cfgintr_virgin(pe, pin);
if (irq == PCI_INVALID_IRQ)
break;
/*
* Ask the BIOS to route the interrupt. If we picked an
* interrupt that failed, we should really try other
* choices that the BIOS offers us.
*
* For uniquely routed interrupts, we need to try
* to route them on some machines. Yet other machines
* fail to route, so we have to pretend that in that
* case it worked. Isn't pc hardware fun?
*
* NOTE: if we want to whack hardware to do this, then
* I think the right way to do that would be to have
* bridge drivers that do this. I'm not sure that the
* $PIR table would be valid for those interrupt
* routers.
*/
args.eax = PCIBIOS_ROUTE_INTERRUPT;
args.ebx = (bus << 8) | (device << 3);
/* pin value is 0xa - 0xd */
args.ecx = (irq << 8) | (0xa + pin - 1);
if (!already &&
bios32(&args, PCIbios.ventry, GSEL(GCODE_SEL, SEL_KPL)) &&
!errok) {
PRVERB(("pci_cfgintr: ROUTE_INTERRUPT failed.\n"));
return(PCI_INVALID_IRQ);
}
printf("pci_cfgintr: %d:%d INT%c routed to irq %d\n", bus,
device, 'A' + pin - 1, irq);
return(irq);
}
PRVERB(("pci_cfgintr: can't route an interrupt to %d:%d INT%c\n", bus,
device, 'A' + pin - 1));
return(PCI_INVALID_IRQ);
}
/*
* Check to see if an existing IRQ setting is valid.
*/
static int
pci_cfgintr_valid(struct PIR_entry *pe, int pin, int irq)
{
uint32_t irqmask;
if (!PCI_INTERRUPT_VALID(irq))
return (0);
irqmask = pe->pe_intpin[pin - 1].irqs;
if (irqmask & (1 << irq)) {
PRVERB(("pci_cfgintr_valid: BIOS irq %d is valid\n", irq));
return (1);
}
return (0);
}
/*
* Look to see if the routing table claims this pin is uniquely routed.
*/
static int
pci_cfgintr_unique(struct PIR_entry *pe, int pin)
{
int irq;
uint32_t irqmask;
irqmask = pe->pe_intpin[pin - 1].irqs;
if (irqmask != 0 && powerof2(irqmask)) {
irq = ffs(irqmask) - 1;
PRVERB(("pci_cfgintr_unique: hard-routed to irq %d\n", irq));
return(irq);
}
return(PCI_INVALID_IRQ);
}
/*
* Look for another device which shares the same link byte and
* already has a unique IRQ, or which has had one routed already.
*/
static int
pci_cfgintr_linked(struct PIR_entry *pe, int pin)
{
struct PIR_entry *oe;
struct PIR_intpin *pi;
int i, j, irq;
/*
* Scan table slots.
*/
for (i = 0, oe = &pci_route_table->pt_entry[0]; i < pci_route_count;
i++, oe++) {
/* scan interrupt pins */
for (j = 0, pi = &oe->pe_intpin[0]; j < 4; j++, pi++) {
/* don't look at the entry we're trying to match */
if ((pe == oe) && (i == (pin - 1)))
continue;
/* compare link bytes */
if (pi->link != pe->pe_intpin[pin - 1].link)
continue;
/* link destination mapped to a unique interrupt? */
if (pi->irqs != 0 && powerof2(pi->irqs)) {
irq = ffs(pi->irqs) - 1;
PRVERB(("pci_cfgintr_linked: linked (%x) to hard-routed irq %d\n",
pi->link, irq));
return(irq);
}
/*
* look for the real PCI device that matches this
* table entry
*/
irq = pci_cfgintr_search(pe, oe->pe_bus, oe->pe_device,
j + 1, pin);
if (irq != PCI_INVALID_IRQ)
return(irq);
}
}
return(PCI_INVALID_IRQ);
}
/*
* Scan for the real PCI device at (bus)/(device) using intpin (matchpin) and
* see if it has already been assigned an interrupt.
*/
static int
pci_cfgintr_search(struct PIR_entry *pe, int bus, int device, int matchpin, int pin)
{
devclass_t pci_devclass;
device_t *pci_devices;
int pci_count;
device_t *pci_children;
int pci_childcount;
device_t *busp, *childp;
int i, j, irq;
/*
* Find all the PCI busses.
*/
pci_count = 0;
if ((pci_devclass = devclass_find("pci")) != NULL)
devclass_get_devices(pci_devclass, &pci_devices, &pci_count);
/*
* Scan all the PCI busses/devices looking for this one.
*/
irq = PCI_INVALID_IRQ;
for (i = 0, busp = pci_devices; (i < pci_count) && (irq == PCI_INVALID_IRQ);
i++, busp++) {
pci_childcount = 0;
device_get_children(*busp, &pci_children, &pci_childcount);
for (j = 0, childp = pci_children; j < pci_childcount; j++,
childp++) {
if ((pci_get_bus(*childp) == bus) &&
(pci_get_slot(*childp) == device) &&
(pci_get_intpin(*childp) == matchpin)) {
irq = pci_i386_map_intline(pci_get_irq(*childp));
if (irq != PCI_INVALID_IRQ)
PRVERB(("pci_cfgintr_search: linked (%x) to configured irq %d at %d:%d:%d\n",
pe->pe_intpin[pin - 1].link, irq,
pci_get_bus(*childp),
pci_get_slot(*childp),
pci_get_function(*childp)));
break;
}
}
if (pci_children != NULL)
free(pci_children, M_TEMP);
}
if (pci_devices != NULL)
free(pci_devices, M_TEMP);
return(irq);
}
/*
* Pick a suitable IRQ from those listed as routable to this device.
*/
static int
pci_cfgintr_virgin(struct PIR_entry *pe, int pin)
{
int irq, ibit;
/*
* first scan the set of PCI-only interrupts and see if any of these
* are routable
*/
for (irq = 0; irq < 16; irq++) {
ibit = (1 << irq);
/* can we use this interrupt? */
if ((pci_route_table->pt_header.ph_pci_irqs & ibit) &&
(pe->pe_intpin[pin - 1].irqs & ibit)) {
PRVERB(("pci_cfgintr_virgin: using routable PCI-only interrupt %d\n", irq));
return(irq);
}
}
/* life is tough, so just pick an interrupt */
for (irq = 0; irq < 16; irq++) {
ibit = (1 << irq);
if ((ibit & pci_irq_override_mask) == 0)
continue;
if (pe->pe_intpin[pin - 1].irqs & ibit) {
PRVERB(("pci_cfgintr_virgin: using routable interrupt %d\n", irq));
return(irq);
}
}
return(PCI_INVALID_IRQ);
}
static void
pci_print_irqmask(u_int16_t irqs)
{
int i, first;
if (irqs == 0) {
printf("none");
return;
}
first = 1;
for (i = 0; i < 16; i++, irqs >>= 1)
if (irqs & 1) {
if (!first)
printf(" ");
else
first = 0;
printf("%d", i);
}
}
/*
* Dump the contents of a PCI BIOS Interrupt Routing Table to the console.
*/
static void
pci_print_route_table(struct PIR_table *prt, int size)
{
struct PIR_entry *entry;
struct PIR_intpin *intpin;
int i, pin;
printf("PCI-Only Interrupts: ");
pci_print_irqmask(prt->pt_header.ph_pci_irqs);
printf("\nLocation Bus Device Pin Link IRQs\n");
entry = &prt->pt_entry[0];
for (i = 0; i < size; i++, entry++) {
intpin = &entry->pe_intpin[0];
for (pin = 0; pin < 4; pin++, intpin++)
if (intpin->link != 0) {
if (entry->pe_slot == 0)
printf("embedded ");
else
printf("slot %-3d ", entry->pe_slot);
printf(" %3d %3d %c 0x%02x ",
entry->pe_bus, entry->pe_device,
'A' + pin, intpin->link);
pci_print_irqmask(intpin->irqs);
printf("\n");
}
}
}
/*
* See if any interrupts for a given PCI bus are routed in the PIR. Don't
* even bother looking if the BIOS doesn't support routing anyways.
*/
int
pci_probe_route_table(int bus)
{
int i;
u_int16_t v;
v = pcibios_get_version();
if (v < 0x0210)
return (0);
for (i = 0; i < pci_route_count; i++)
if (pci_route_table->pt_entry[i].pe_bus == bus)
return (1);
return (0);
}
/*
* Configuration space access using direct register operations
*/
/* enable configuration space accesses and return data port address */
static int
pci_cfgenable(unsigned bus, unsigned slot, unsigned func, int reg, int bytes)
{
int dataport = 0;
if (bus <= PCI_BUSMAX
&& slot < devmax
&& func <= PCI_FUNCMAX
&& reg <= PCI_REGMAX
&& bytes != 3
&& (unsigned) bytes <= 4
&& (reg & (bytes - 1)) == 0) {
switch (cfgmech) {
case 1:
outl(CONF1_ADDR_PORT, (1 << 31)
| (bus << 16) | (slot << 11)
| (func << 8) | (reg & ~0x03));
dataport = CONF1_DATA_PORT + (reg & 0x03);
break;
case 2:
outb(CONF2_ENABLE_PORT, 0xf0 | (func << 1));
outb(CONF2_FORWARD_PORT, bus);
dataport = 0xc000 | (slot << 8) | reg;
break;
}
}
return (dataport);
}
/* disable configuration space accesses */
static void
pci_cfgdisable(void)
{
switch (cfgmech) {
case 1:
outl(CONF1_ADDR_PORT, 0);
break;
case 2:
outb(CONF2_ENABLE_PORT, 0);
outb(CONF2_FORWARD_PORT, 0);
break;
}
}
static int
pcireg_cfgread(int bus, int slot, int func, int reg, int bytes)
{
int data = -1;
int port;
mtx_lock_spin(&pcicfg_mtx);
port = pci_cfgenable(bus, slot, func, reg, bytes);
if (port != 0) {
switch (bytes) {
case 1:
data = inb(port);
break;
case 2:
data = inw(port);
break;
case 4:
data = inl(port);
break;
}
pci_cfgdisable();
}
mtx_unlock_spin(&pcicfg_mtx);
return (data);
}
static void
pcireg_cfgwrite(int bus, int slot, int func, int reg, int data, int bytes)
{
int port;
mtx_lock_spin(&pcicfg_mtx);
port = pci_cfgenable(bus, slot, func, reg, bytes);
if (port != 0) {
switch (bytes) {
case 1:
outb(port, data);
break;
case 2:
outw(port, data);
break;
case 4:
outl(port, data);
break;
}
pci_cfgdisable();
}
mtx_unlock_spin(&pcicfg_mtx);
}
/* check whether the configuration mechanism has been correctly identified */
static int
pci_cfgcheck(int maxdev)
{
uint32_t id, class;
uint8_t header;
uint8_t device;
int port;
if (bootverbose)
printf("pci_cfgcheck:\tdevice ");
for (device = 0; device < maxdev; device++) {
if (bootverbose)
printf("%d ", device);
port = pci_cfgenable(0, device, 0, 0, 4);
id = inl(port);
if (id == 0 || id == 0xffffffff)
continue;
port = pci_cfgenable(0, device, 0, 8, 4);
class = inl(port) >> 8;
if (bootverbose)
printf("[class=%06x] ", class);
if (class == 0 || (class & 0xf870ff) != 0)
continue;
port = pci_cfgenable(0, device, 0, 14, 1);
header = inb(port);
if (bootverbose)
printf("[hdr=%02x] ", header);
if ((header & 0x7e) != 0)
continue;
if (bootverbose)
printf("is there (id=%08x)\n", id);
pci_cfgdisable();
return (1);
}
if (bootverbose)
printf("-- nothing found\n");
pci_cfgdisable();
return (0);
}
static int
pcireg_cfgopen(void)
{
uint32_t mode1res, oldval1;
uint8_t mode2res, oldval2;
oldval1 = inl(CONF1_ADDR_PORT);
if (bootverbose) {
printf("pci_open(1):\tmode 1 addr port (0x0cf8) is 0x%08x\n",
oldval1);
}
if ((oldval1 & CONF1_ENABLE_MSK) == 0) {
cfgmech = 1;
devmax = 32;
outl(CONF1_ADDR_PORT, CONF1_ENABLE_CHK);
outb(CONF1_ADDR_PORT + 3, 0);
mode1res = inl(CONF1_ADDR_PORT);
outl(CONF1_ADDR_PORT, oldval1);
if (bootverbose)
printf("pci_open(1a):\tmode1res=0x%08x (0x%08lx)\n",
mode1res, CONF1_ENABLE_CHK);
if (mode1res) {
if (pci_cfgcheck(32))
return (cfgmech);
}
outl(CONF1_ADDR_PORT, CONF1_ENABLE_CHK1);
mode1res = inl(CONF1_ADDR_PORT);
outl(CONF1_ADDR_PORT, oldval1);
if (bootverbose)
printf("pci_open(1b):\tmode1res=0x%08x (0x%08lx)\n",
mode1res, CONF1_ENABLE_CHK1);
if ((mode1res & CONF1_ENABLE_MSK1) == CONF1_ENABLE_RES1) {
if (pci_cfgcheck(32))
return (cfgmech);
}
}
oldval2 = inb(CONF2_ENABLE_PORT);
if (bootverbose) {
printf("pci_open(2):\tmode 2 enable port (0x0cf8) is 0x%02x\n",
oldval2);
}
if ((oldval2 & 0xf0) == 0) {
cfgmech = 2;
devmax = 16;
outb(CONF2_ENABLE_PORT, CONF2_ENABLE_CHK);
mode2res = inb(CONF2_ENABLE_PORT);
outb(CONF2_ENABLE_PORT, oldval2);
if (bootverbose)
printf("pci_open(2a):\tmode2res=0x%02x (0x%02x)\n",
mode2res, CONF2_ENABLE_CHK);
if (mode2res == CONF2_ENABLE_RES) {
if (bootverbose)
printf("pci_open(2a):\tnow trying mechanism 2\n");
if (pci_cfgcheck(16))
return (cfgmech);
}
}
cfgmech = 0;
devmax = 0;
return (cfgmech);
}
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