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freebsd-dev/sys/i386/i386/io_apic.c

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/*-
* Copyright (c) 2003 John Baldwin <jhb@FreeBSD.org>
* 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, 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.
* 3. Neither the name of the author nor the names of any co-contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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 "opt_isa.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/kernel.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/apicreg.h>
#include <machine/frame.h>
#include <machine/intr_machdep.h>
#include <machine/apicvar.h>
#include <machine/segments.h>
#define IOAPIC_ISA_INTS 16
#define IOAPIC_MEM_REGION 32
#define IOAPIC_REDTBL_LO(i) (IOAPIC_REDTBL + (i) * 2)
#define IOAPIC_REDTBL_HI(i) (IOAPIC_REDTBL_LO(i) + 1)
#define IRQ_EXTINT (NUM_IO_INTS + 1)
#define IRQ_NMI (NUM_IO_INTS + 2)
#define IRQ_SMI (NUM_IO_INTS + 3)
#define IRQ_DISABLED (NUM_IO_INTS + 4)
#define TODO printf("%s: not implemented!\n", __func__)
static MALLOC_DEFINE(M_IOAPIC, "io_apic", "I/O APIC structures");
/*
* I/O APIC interrupt source driver. Each pin is assigned an IRQ cookie
* as laid out in the ACPI System Interrupt number model where each I/O
* APIC has a contiguous chunk of the System Interrupt address space.
* We assume that IRQs 1 - 15 behave like ISA IRQs and that all other
* IRQs behave as PCI IRQs by default. We also assume that the pin for
* IRQ 0 is actually an ExtINT pin. The apic enumerators override the
* configuration of individual pins as indicated by their tables.
*
* Documentation for the I/O APIC: "82093AA I/O Advanced Programmable
* Interrupt Controller (IOAPIC)", May 1996, Intel Corp.
* ftp://download.intel.com/design/chipsets/datashts/29056601.pdf
*/
struct ioapic_intsrc {
struct intsrc io_intsrc;
u_int io_irq;
u_int io_intpin:8;
u_int io_vector:8;
u_int io_cpu:8;
u_int io_activehi:1;
u_int io_edgetrigger:1;
u_int io_masked:1;
int io_bus:4;
};
struct ioapic {
struct pic io_pic;
u_int io_id:8; /* logical ID */
u_int io_apic_id:4;
u_int io_intbase:8; /* System Interrupt base */
u_int io_numintr:8;
volatile ioapic_t *io_addr; /* XXX: should use bus_space */
STAILQ_ENTRY(ioapic) io_next;
struct ioapic_intsrc io_pins[0];
};
static u_int ioapic_read(volatile ioapic_t *apic, int reg);
static void ioapic_write(volatile ioapic_t *apic, int reg, u_int val);
static const char *ioapic_bus_string(int bus_type);
static void ioapic_print_irq(struct ioapic_intsrc *intpin);
static void ioapic_enable_source(struct intsrc *isrc);
static void ioapic_disable_source(struct intsrc *isrc, int eoi);
static void ioapic_eoi_source(struct intsrc *isrc);
static void ioapic_enable_intr(struct intsrc *isrc);
static int ioapic_vector(struct intsrc *isrc);
static int ioapic_source_pending(struct intsrc *isrc);
static int ioapic_config_intr(struct intsrc *isrc, enum intr_trigger trig,
enum intr_polarity pol);
static void ioapic_suspend(struct intsrc *isrc);
static void ioapic_resume(struct intsrc *isrc);
static void ioapic_assign_cpu(struct intsrc *isrc, u_int apic_id);
static void ioapic_program_intpin(struct ioapic_intsrc *intpin);
static STAILQ_HEAD(,ioapic) ioapic_list = STAILQ_HEAD_INITIALIZER(ioapic_list);
struct pic ioapic_template = { ioapic_enable_source, ioapic_disable_source,
ioapic_eoi_source, ioapic_enable_intr,
ioapic_vector, ioapic_source_pending,
ioapic_suspend, ioapic_resume,
ioapic_config_intr, ioapic_assign_cpu };
static int next_ioapic_base;
static u_int next_id;
SYSCTL_NODE(_hw, OID_AUTO, apic, CTLFLAG_RD, 0, "APIC options");
static int enable_extint;
SYSCTL_INT(_hw_apic, OID_AUTO, enable_extint, CTLFLAG_RDTUN, &enable_extint, 0,
"Enable the ExtINT pin in the first I/O APIC");
TUNABLE_INT("hw.apic.enable_extint", &enable_extint);
static __inline void
_ioapic_eoi_source(struct intsrc *isrc)
{
lapic_eoi();
}
static u_int
ioapic_read(volatile ioapic_t *apic, int reg)
{
mtx_assert(&icu_lock, MA_OWNED);
apic->ioregsel = reg;
return (apic->iowin);
}
static void
ioapic_write(volatile ioapic_t *apic, int reg, u_int val)
{
mtx_assert(&icu_lock, MA_OWNED);
apic->ioregsel = reg;
apic->iowin = val;
}
static const char *
ioapic_bus_string(int bus_type)
{
switch (bus_type) {
case APIC_BUS_ISA:
return ("ISA");
case APIC_BUS_EISA:
return ("EISA");
case APIC_BUS_PCI:
return ("PCI");
default:
return ("unknown");
}
}
static void
ioapic_print_irq(struct ioapic_intsrc *intpin)
{
switch (intpin->io_irq) {
case IRQ_DISABLED:
printf("disabled");
break;
case IRQ_EXTINT:
printf("ExtINT");
break;
case IRQ_NMI:
printf("NMI");
break;
case IRQ_SMI:
printf("SMI");
break;
default:
printf("%s IRQ %u", ioapic_bus_string(intpin->io_bus),
intpin->io_irq);
}
}
static void
ioapic_enable_source(struct intsrc *isrc)
{
struct ioapic_intsrc *intpin = (struct ioapic_intsrc *)isrc;
struct ioapic *io = (struct ioapic *)isrc->is_pic;
uint32_t flags;
mtx_lock_spin(&icu_lock);
if (intpin->io_masked) {
flags = ioapic_read(io->io_addr,
IOAPIC_REDTBL_LO(intpin->io_intpin));
flags &= ~(IOART_INTMASK);
ioapic_write(io->io_addr, IOAPIC_REDTBL_LO(intpin->io_intpin),
flags);
intpin->io_masked = 0;
}
mtx_unlock_spin(&icu_lock);
}
static void
ioapic_disable_source(struct intsrc *isrc, int eoi)
{
struct ioapic_intsrc *intpin = (struct ioapic_intsrc *)isrc;
struct ioapic *io = (struct ioapic *)isrc->is_pic;
uint32_t flags;
mtx_lock_spin(&icu_lock);
if (!intpin->io_masked && !intpin->io_edgetrigger) {
flags = ioapic_read(io->io_addr,
IOAPIC_REDTBL_LO(intpin->io_intpin));
flags |= IOART_INTMSET;
ioapic_write(io->io_addr, IOAPIC_REDTBL_LO(intpin->io_intpin),
flags);
intpin->io_masked = 1;
}
if (eoi == PIC_EOI)
_ioapic_eoi_source(isrc);
mtx_unlock_spin(&icu_lock);
}
static void
ioapic_eoi_source(struct intsrc *isrc)
{
_ioapic_eoi_source(isrc);
}
/*
* Completely program an intpin based on the data in its interrupt source
* structure.
*/
static void
ioapic_program_intpin(struct ioapic_intsrc *intpin)
{
struct ioapic *io = (struct ioapic *)intpin->io_intsrc.is_pic;
uint32_t low, high, value;
/*
* If a pin is completely invalid or if it is valid but hasn't
* been enabled yet, just ensure that the pin is masked.
*/
if (intpin->io_irq == IRQ_DISABLED || (intpin->io_irq < NUM_IO_INTS &&
intpin->io_vector == 0)) {
mtx_lock_spin(&icu_lock);
low = ioapic_read(io->io_addr,
IOAPIC_REDTBL_LO(intpin->io_intpin));
if ((low & IOART_INTMASK) == IOART_INTMCLR)
ioapic_write(io->io_addr,
IOAPIC_REDTBL_LO(intpin->io_intpin),
low | IOART_INTMSET);
mtx_unlock_spin(&icu_lock);
return;
}
/* Set the destination. */
low = IOART_DESTPHY;
high = intpin->io_cpu << APIC_ID_SHIFT;
/* Program the rest of the low word. */
if (intpin->io_edgetrigger)
low |= IOART_TRGREDG;
else
low |= IOART_TRGRLVL;
if (intpin->io_activehi)
low |= IOART_INTAHI;
else
low |= IOART_INTALO;
if (intpin->io_masked)
low |= IOART_INTMSET;
switch (intpin->io_irq) {
case IRQ_EXTINT:
KASSERT(intpin->io_edgetrigger,
("ExtINT not edge triggered"));
low |= IOART_DELEXINT;
break;
case IRQ_NMI:
KASSERT(intpin->io_edgetrigger,
("NMI not edge triggered"));
low |= IOART_DELNMI;
break;
case IRQ_SMI:
KASSERT(intpin->io_edgetrigger,
("SMI not edge triggered"));
low |= IOART_DELSMI;
break;
default:
KASSERT(intpin->io_vector != 0, ("No vector for IRQ %u",
intpin->io_irq));
low |= IOART_DELFIXED | intpin->io_vector;
}
/* Write the values to the APIC. */
mtx_lock_spin(&icu_lock);
ioapic_write(io->io_addr, IOAPIC_REDTBL_LO(intpin->io_intpin), low);
value = ioapic_read(io->io_addr, IOAPIC_REDTBL_HI(intpin->io_intpin));
value &= ~IOART_DEST;
value |= high;
ioapic_write(io->io_addr, IOAPIC_REDTBL_HI(intpin->io_intpin), value);
mtx_unlock_spin(&icu_lock);
}
static void
ioapic_assign_cpu(struct intsrc *isrc, u_int apic_id)
{
struct ioapic_intsrc *intpin = (struct ioapic_intsrc *)isrc;
struct ioapic *io = (struct ioapic *)isrc->is_pic;
intpin->io_cpu = apic_id;
if (bootverbose) {
printf("ioapic%u: Assigning ", io->io_id);
ioapic_print_irq(intpin);
printf(" to local APIC %u\n", intpin->io_cpu);
}
ioapic_program_intpin(intpin);
}
static void
ioapic_enable_intr(struct intsrc *isrc)
{
struct ioapic_intsrc *intpin = (struct ioapic_intsrc *)isrc;
struct ioapic *io = (struct ioapic *)isrc->is_pic;
if (intpin->io_vector == 0) {
/*
* Allocate an APIC vector for this interrupt pin. Once
* we have a vector we program the interrupt pin.
*/
intpin->io_vector = apic_alloc_vector(intpin->io_irq);
if (bootverbose) {
printf("ioapic%u: routing intpin %u (", io->io_id,
intpin->io_intpin);
ioapic_print_irq(intpin);
printf(") to vector %u\n", intpin->io_vector);
}
ioapic_program_intpin(intpin);
apic_enable_vector(intpin->io_vector);
}
}
static int
ioapic_vector(struct intsrc *isrc)
{
struct ioapic_intsrc *pin;
pin = (struct ioapic_intsrc *)isrc;
return (pin->io_irq);
}
static int
ioapic_source_pending(struct intsrc *isrc)
{
struct ioapic_intsrc *intpin = (struct ioapic_intsrc *)isrc;
if (intpin->io_vector == 0)
return 0;
return (lapic_intr_pending(intpin->io_vector));
}
static int
ioapic_config_intr(struct intsrc *isrc, enum intr_trigger trig,
enum intr_polarity pol)
{
struct ioapic_intsrc *intpin = (struct ioapic_intsrc *)isrc;
struct ioapic *io = (struct ioapic *)isrc->is_pic;
int changed;
KASSERT(!(trig == INTR_TRIGGER_CONFORM || pol == INTR_POLARITY_CONFORM),
("%s: Conforming trigger or polarity\n", __func__));
/*
* EISA interrupts always use active high polarity, so don't allow
* them to be set to active low.
*
* XXX: Should we write to the ELCR if the trigger mode changes for
* an EISA IRQ or an ISA IRQ with the ELCR present?
*/
if (intpin->io_bus == APIC_BUS_EISA)
pol = INTR_POLARITY_HIGH;
changed = 0;
if (intpin->io_edgetrigger != (trig == INTR_TRIGGER_EDGE)) {
if (bootverbose)
printf("ioapic%u: Changing trigger for pin %u to %s\n",
io->io_id, intpin->io_intpin,
trig == INTR_TRIGGER_EDGE ? "edge" : "level");
intpin->io_edgetrigger = (trig == INTR_TRIGGER_EDGE);
changed++;
}
if (intpin->io_activehi != (pol == INTR_POLARITY_HIGH)) {
if (bootverbose)
printf("ioapic%u: Changing polarity for pin %u to %s\n",
io->io_id, intpin->io_intpin,
pol == INTR_POLARITY_HIGH ? "high" : "low");
intpin->io_activehi = (pol == INTR_POLARITY_HIGH);
changed++;
}
if (changed)
ioapic_program_intpin(intpin);
return (0);
}
static void
ioapic_suspend(struct intsrc *isrc)
{
TODO;
}
static void
ioapic_resume(struct intsrc *isrc)
{
ioapic_program_intpin((struct ioapic_intsrc *)isrc);
}
/*
* Create a plain I/O APIC object.
*/
void *
ioapic_create(uintptr_t addr, int32_t apic_id, int intbase)
{
struct ioapic *io;
struct ioapic_intsrc *intpin;
volatile ioapic_t *apic;
u_int numintr, i;
uint32_t value;
/* Map the register window so we can access the device. */
apic = pmap_mapdev(addr, IOAPIC_MEM_REGION);
mtx_lock_spin(&icu_lock);
value = ioapic_read(apic, IOAPIC_VER);
mtx_unlock_spin(&icu_lock);
/* If it's version register doesn't seem to work, punt. */
if (value == 0xffffffff) {
pmap_unmapdev((vm_offset_t)apic, IOAPIC_MEM_REGION);
return (NULL);
}
/* Determine the number of vectors and set the APIC ID. */
numintr = ((value & IOART_VER_MAXREDIR) >> MAXREDIRSHIFT) + 1;
io = malloc(sizeof(struct ioapic) +
numintr * sizeof(struct ioapic_intsrc), M_IOAPIC, M_WAITOK);
io->io_pic = ioapic_template;
mtx_lock_spin(&icu_lock);
io->io_id = next_id++;
io->io_apic_id = ioapic_read(apic, IOAPIC_ID) >> APIC_ID_SHIFT;
if (apic_id != -1 && io->io_apic_id != apic_id) {
ioapic_write(apic, IOAPIC_ID, apic_id << APIC_ID_SHIFT);
mtx_unlock_spin(&icu_lock);
io->io_apic_id = apic_id;
printf("ioapic%u: Changing APIC ID to %d\n", io->io_id,
apic_id);
} else
mtx_unlock_spin(&icu_lock);
if (intbase == -1) {
intbase = next_ioapic_base;
printf("ioapic%u: Assuming intbase of %d\n", io->io_id,
intbase);
} else if (intbase != next_ioapic_base)
printf("ioapic%u: WARNING: intbase %d != expected base %d\n",
io->io_id, intbase, next_ioapic_base);
io->io_intbase = intbase;
next_ioapic_base = intbase + numintr;
io->io_numintr = numintr;
io->io_addr = apic;
/*
* Initialize pins. Start off with interrupts disabled. Default
* to active-hi and edge-triggered for ISA interrupts and active-lo
* and level-triggered for all others.
*/
bzero(io->io_pins, sizeof(struct ioapic_intsrc) * numintr);
mtx_lock_spin(&icu_lock);
for (i = 0, intpin = io->io_pins; i < numintr; i++, intpin++) {
intpin->io_intsrc.is_pic = (struct pic *)io;
intpin->io_intpin = i;
intpin->io_irq = intbase + i;
/*
* Assume that pin 0 on the first I/O APIC is an ExtINT pin.
* Assume that pins 1-15 are ISA interrupts and that all
* other pins are PCI interrupts.
*/
if (intpin->io_irq == 0)
ioapic_set_extint(io, i);
else if (intpin->io_irq < IOAPIC_ISA_INTS) {
intpin->io_bus = APIC_BUS_ISA;
intpin->io_activehi = 1;
intpin->io_edgetrigger = 1;
intpin->io_masked = 1;
} else {
intpin->io_bus = APIC_BUS_PCI;
intpin->io_activehi = 0;
intpin->io_edgetrigger = 0;
intpin->io_masked = 1;
}
/*
* Route interrupts to the BSP by default. Interrupts may
* be routed to other CPUs later after they are enabled.
*/
intpin->io_cpu = PCPU_GET(apic_id);
if (bootverbose && intpin->io_irq != IRQ_DISABLED) {
printf("ioapic%u: intpin %d -> ", io->io_id, i);
ioapic_print_irq(intpin);
printf(" (%s, %s)\n", intpin->io_edgetrigger ?
"edge" : "level", intpin->io_activehi ? "high" :
"low");
}
value = ioapic_read(apic, IOAPIC_REDTBL_LO(i));
ioapic_write(apic, IOAPIC_REDTBL_LO(i), value | IOART_INTMSET);
}
mtx_unlock_spin(&icu_lock);
return (io);
}
int
ioapic_get_vector(void *cookie, u_int pin)
{
struct ioapic *io;
io = (struct ioapic *)cookie;
if (pin >= io->io_numintr)
return (-1);
return (io->io_pins[pin].io_irq);
}
int
ioapic_disable_pin(void *cookie, u_int pin)
{
struct ioapic *io;
io = (struct ioapic *)cookie;
if (pin >= io->io_numintr)
return (EINVAL);
if (io->io_pins[pin].io_irq == IRQ_DISABLED)
return (EINVAL);
io->io_pins[pin].io_irq = IRQ_DISABLED;
if (bootverbose)
printf("ioapic%u: intpin %d disabled\n", io->io_id, pin);
return (0);
}
int
ioapic_remap_vector(void *cookie, u_int pin, int vector)
{
struct ioapic *io;
io = (struct ioapic *)cookie;
if (pin >= io->io_numintr || vector < 0)
return (EINVAL);
if (io->io_pins[pin].io_irq >= NUM_IO_INTS)
return (EINVAL);
io->io_pins[pin].io_irq = vector;
if (bootverbose)
printf("ioapic%u: Routing IRQ %d -> intpin %d\n", io->io_id,
vector, pin);
return (0);
}
int
ioapic_set_bus(void *cookie, u_int pin, int bus_type)
{
struct ioapic *io;
if (bus_type < 0 || bus_type > APIC_BUS_MAX)
return (EINVAL);
io = (struct ioapic *)cookie;
if (pin >= io->io_numintr)
return (EINVAL);
if (io->io_pins[pin].io_irq >= NUM_IO_INTS)
return (EINVAL);
io->io_pins[pin].io_bus = bus_type;
if (bootverbose)
printf("ioapic%u: intpin %d bus %s\n", io->io_id, pin,
ioapic_bus_string(bus_type));
return (0);
}
int
ioapic_set_nmi(void *cookie, u_int pin)
{
struct ioapic *io;
io = (struct ioapic *)cookie;
if (pin >= io->io_numintr)
return (EINVAL);
if (io->io_pins[pin].io_irq == IRQ_NMI)
return (0);
if (io->io_pins[pin].io_irq >= NUM_IO_INTS)
return (EINVAL);
io->io_pins[pin].io_bus = APIC_BUS_UNKNOWN;
io->io_pins[pin].io_irq = IRQ_NMI;
io->io_pins[pin].io_masked = 0;
io->io_pins[pin].io_edgetrigger = 1;
io->io_pins[pin].io_activehi = 1;
if (bootverbose)
printf("ioapic%u: Routing NMI -> intpin %d\n",
io->io_id, pin);
return (0);
}
int
ioapic_set_smi(void *cookie, u_int pin)
{
struct ioapic *io;
io = (struct ioapic *)cookie;
if (pin >= io->io_numintr)
return (EINVAL);
if (io->io_pins[pin].io_irq == IRQ_SMI)
return (0);
if (io->io_pins[pin].io_irq >= NUM_IO_INTS)
return (EINVAL);
io->io_pins[pin].io_bus = APIC_BUS_UNKNOWN;
io->io_pins[pin].io_irq = IRQ_SMI;
io->io_pins[pin].io_masked = 0;
io->io_pins[pin].io_edgetrigger = 1;
io->io_pins[pin].io_activehi = 1;
if (bootverbose)
printf("ioapic%u: Routing SMI -> intpin %d\n",
io->io_id, pin);
return (0);
}
int
ioapic_set_extint(void *cookie, u_int pin)
{
struct ioapic *io;
io = (struct ioapic *)cookie;
if (pin >= io->io_numintr)
return (EINVAL);
if (io->io_pins[pin].io_irq == IRQ_EXTINT)
return (0);
if (io->io_pins[pin].io_irq >= NUM_IO_INTS)
return (EINVAL);
io->io_pins[pin].io_bus = APIC_BUS_UNKNOWN;
io->io_pins[pin].io_irq = IRQ_EXTINT;
if (enable_extint)
io->io_pins[pin].io_masked = 0;
else
io->io_pins[pin].io_masked = 1;
io->io_pins[pin].io_edgetrigger = 1;
io->io_pins[pin].io_activehi = 1;
if (bootverbose)
printf("ioapic%u: Routing external 8259A's -> intpin %d\n",
io->io_id, pin);
return (0);
}
int
ioapic_set_polarity(void *cookie, u_int pin, enum intr_polarity pol)
{
struct ioapic *io;
io = (struct ioapic *)cookie;
if (pin >= io->io_numintr || pol == INTR_POLARITY_CONFORM)
return (EINVAL);
if (io->io_pins[pin].io_irq >= NUM_IO_INTS)
return (EINVAL);
io->io_pins[pin].io_activehi = (pol == INTR_POLARITY_HIGH);
if (bootverbose)
printf("ioapic%u: intpin %d polarity: %s\n", io->io_id, pin,
pol == INTR_POLARITY_HIGH ? "high" : "low");
return (0);
}
int
ioapic_set_triggermode(void *cookie, u_int pin, enum intr_trigger trigger)
{
struct ioapic *io;
io = (struct ioapic *)cookie;
if (pin >= io->io_numintr || trigger == INTR_TRIGGER_CONFORM)
return (EINVAL);
if (io->io_pins[pin].io_irq >= NUM_IO_INTS)
return (EINVAL);
io->io_pins[pin].io_edgetrigger = (trigger == INTR_TRIGGER_EDGE);
if (bootverbose)
printf("ioapic%u: intpin %d trigger: %s\n", io->io_id, pin,
trigger == INTR_TRIGGER_EDGE ? "edge" : "level");
return (0);
}
/*
* Register a complete I/O APIC object with the interrupt subsystem.
*/
void
ioapic_register(void *cookie)
{
struct ioapic_intsrc *pin;
struct ioapic *io;
volatile ioapic_t *apic;
uint32_t flags;
int i;
io = (struct ioapic *)cookie;
apic = io->io_addr;
mtx_lock_spin(&icu_lock);
flags = ioapic_read(apic, IOAPIC_VER) & IOART_VER_VERSION;
STAILQ_INSERT_TAIL(&ioapic_list, io, io_next);
mtx_unlock_spin(&icu_lock);
printf("ioapic%u <Version %u.%u> irqs %u-%u on motherboard\n",
io->io_id, flags >> 4, flags & 0xf, io->io_intbase,
io->io_intbase + io->io_numintr - 1);
/* Register valid pins as interrupt sources. */
for (i = 0, pin = io->io_pins; i < io->io_numintr; i++, pin++)
if (pin->io_irq < NUM_IO_INTS)
intr_register_source(&pin->io_intsrc);
}
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