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Kernel interrupt hook management fixes:

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- properly assign unique hook IDs
- after hook removal, remove hook-specific interrupt disable flag
This commit is contained in:
David van Moolenbroek 2009-05-07 14:52:07 +00:00
parent a38287067a
commit 4af032bbfe
1 changed files with 13 additions and 6 deletions
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19
kernel/interrupt.c
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@ -28,22 +28,27 @@ PUBLIC void put_irq_handler( irq_hook_t* hook, int irq, irq_handler_t handler)
{
int id;
irq_hook_t **line;
unsigned long bitmap;
if( irq < 0 || irq >= NR_IRQ_VECTORS )
minix_panic("invalid call to put_irq_handler", irq);
line = &irq_handlers[irq];
id = 1;
bitmap = 0;
while ( *line != NULL ) {
if(hook == *line) return; /* extra initialization */
bitmap |= (*line)->id; /* mark ids in use */
line = &(*line)->next;
id <<= 1; /* max 32 hooks for one line. */
}
if(id == 0)
minix_panic("Too many handlers for irq", irq);
/* find the lowest id not in use */
for (id = 1; id != 0; id <<= 1)
if (!(bitmap & id)) break;
if(id == 0)
minix_panic("Too many handlers for irq", irq);
hook->next = NULL;
hook->handler = handler;
hook->irq = irq;
@ -81,6 +86,8 @@ PUBLIC void rm_irq_handler( irq_hook_t* hook ) {
(*line) = (*line)->next;
if(!irq_handlers[irq])
irq_use &= ~(1 << irq);
if (irq_actids[irq] & id)
irq_actids[irq] &= ~id;
return;
}
line = &(*line)->next;