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Add a tunable 'hw.apic.enable_extint' that can be set from the loader to

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not mask the ExtINT pin on the first I/O APIC as at least one PIII chipset
seems to need this even though all of the pins in the 8259A's are masked.
The default is still to mask the ExtINT pin.

Reported by:	Mike Tancsa mike at sentex.net
MFC after:	3 days
This commit is contained in:
jhb 2005-07-29 18:58:33 +00:00
parent d4f57755dc
commit 91a55b80e8
1 changed files with 12 additions and 2 deletions
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14
sys/i386/i386/io_apic.c
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@ -39,6 +39,7 @@ __FBSDID("$FreeBSD$");
#include <sys/malloc.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/sysctl.h>
#include <vm/vm.h>
#include <vm/pmap.h>
@ -129,6 +130,12 @@ struct pic ioapic_template = { ioapic_enable_source, ioapic_disable_source,
static int bsp_id, current_cluster, logical_clusters, next_ioapic_base;
static u_int next_id, program_logical_dest;
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)
{
@ -286,7 +293,7 @@ ioapic_program_intpin(struct ioapic_intsrc *intpin)
switch (intpin->io_vector) {
case VECTOR_EXTINT:
KASSERT(intpin->io_edgetrigger,
("EXTINT not edge triggered"));
("ExtINT not edge triggered"));
low |= IOART_DELEXINT;
break;
case VECTOR_NMI:
@ -680,7 +687,10 @@ ioapic_set_extint(void *cookie, u_int pin)
return (EINVAL);
io->io_pins[pin].io_bus = APIC_BUS_UNKNOWN;
io->io_pins[pin].io_vector = VECTOR_EXTINT;
io->io_pins[pin].io_masked = 1;
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)