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Allow multiple drivers to share one interrupt vector.

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This commit is contained in:
eeh 2000-06-08 23:01:22 +00:00
parent 1b31fdcbb7
commit 6c144faa4c
1 changed files with 56 additions and 5 deletions
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61
sys/arch/sparc64/sparc64/intr.c
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@ -1,4 +1,4 @@
/* $NetBSD: intr.c,v 1.24 2000/06/02 15:36:53 eeh Exp $ */
/* $NetBSD: intr.c,v 1.25 2000/06/08 23:01:22 eeh Exp $ */
/*
* Copyright (c) 1992, 1993
@ -111,6 +111,7 @@ void strayintr __P((const struct trapframe64 *, int));
int softintr __P((void *));
int softnet __P((void *));
int send_softclock __P((void *));
int intr_list_handler __P((void *));
/*
* Stray interrupt handler. Clear it if possible.
@ -242,6 +243,35 @@ struct intrhand *intrhand[15] = {
int fastvec = 0;
/*
* PCI devices can share interrupts so we need to have
* a handler to hand out interrupts.
*/
int
intr_list_handler(arg)
void * arg;
{
int claimed = 0;
struct intrhand *ih = (struct intrhand *)arg;
if (!arg) panic("intr_list_handler: no handlers!");
while (ih && !claimed) {
claimed = (*ih->ih_fun)(ih->ih_arg);
#ifdef DEBUG
{
extern int intrdebug;
if (intrdebug)
printf("intr %p %x arg %p %s\n",
ih, ih->ih_number, ih->ih_arg,
claimed ? "claimed" : "");
}
#endif
ih = ih->ih_next;
}
return (claimed);
}
/*
* Attach an interrupt handler to the vector chain for the given level.
* This is not possible if it has been taken away as a fast vector.
@ -275,11 +305,32 @@ intr_establish(level, ih)
}
#endif
if (ih->ih_number < MAXINTNUM && ih->ih_number >= 0) {
if (intrlev[ih->ih_number])
panic("intr_establish: intr reused %d", ih->ih_number);
intrlev[ih->ih_number] = ih;
if ((q = intrlev[ih->ih_number])) {
struct intrhand *nih;
/*
* Interrupt is already there. We need to create a
* new interrupt handler and interpose it.
*/
printf("intr_establish: intr reused %d\n", ih->ih_number);
if (q->ih_fun != intr_list_handler) {
nih = (struct intrhand *)
malloc(sizeof(struct intrhand),
M_DEVBUF, M_NOWAIT);
/* Point the old IH at the new handler */
*nih = *q;
q->ih_fun = intr_list_handler;
q->ih_arg = (void *)nih;
nih->ih_next = NULL;
}
/* Add the ih to the head of the list */
ih->ih_next = (struct intrhand *)q->ih_arg;
q->ih_arg = (void *)ih;
}
else
intrlev[ih->ih_number] = ih;
#ifdef NOT_DEBUG
printf("\nintr_establish: vector %x pli %x mapintr %p clrintr %p fun %p arg %p\n",
printf("\nintr_establish: vector %x pil %x mapintr %p clrintr %p fun %p arg %p\n",
ih->ih_number, ih->ih_pil, (long)ih->ih_map, (long)ih->ih_clr, ih->ih_fun, ih->ih_arg);
/*Debugger();*/
#endif