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Implement sio_intr_disestablish(), and ensure that an initially-enabled 

interrupt is never disabled and an initially-level-triggered interrupt
never becomes untyped.
This commit is contained in:
thorpej 1998-08-01 18:54:21 +00:00
parent 528dab6808
commit 0b60fda7c8
1 changed files with 22 additions and 6 deletions
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28
sys/arch/alpha/pci/sio_pic.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: sio_pic.c,v 1.21 1998/05/23 18:35:56 matt Exp $ */
/* $NetBSD: sio_pic.c,v 1.22 1998/08/01 18:54:21 thorpej Exp $ */
/*-
* Copyright (c) 1998 The NetBSD Foundation, Inc.
@ -66,7 +66,7 @@
#include <sys/cdefs.h> /* RCS ID & Copyright macro defns */
__KERNEL_RCSID(0, "$NetBSD: sio_pic.c,v 1.21 1998/05/23 18:35:56 matt Exp $");
__KERNEL_RCSID(0, "$NetBSD: sio_pic.c,v 1.22 1998/08/01 18:54:21 thorpej Exp $");
#include <sys/param.h>
#include <sys/systm.h>
@ -499,12 +499,28 @@ sio_intr_disestablish(v, cookie)
void *v;
void *cookie;
{
struct alpha_shared_intrhand *ih = cookie;
int s, irq = ih->ih_num;
int ist = INITIALLY_LEVEL_TRIGGERED(irq) ? IST_LEVEL : IST_NONE;
printf("sio_intr_disestablish(%p)\n", cookie);
/* XXX */
s = splhigh();
/* XXX NEVER ALLOW AN INITIALLY-ENABLED INTERRUPT TO BE DISABLED */
/* XXX NEVER ALLOW AN INITIALLY-LT INTERRUPT TO BECOME UNTYPED */
/* Remove it from the link. */
alpha_shared_intr_disestablish(sio_intr, cookie, "isa irq");
/*
* Decide if we should disable the interrupt. We must ensure
* that:
*
* - An initially-enabled interrupt is never disabled.
* - An initially-LT interrupt is never untyped.
*/
if (alpha_shared_intr_isactive(sio_intr, irq) == 0) {
sio_setirqstat(irq, INITIALLY_ENABLED(irq), ist);
alpha_shared_intr_set_dfltsharetype(sio_intr, irq, ist);
}
splx(s);
}
void