irq.c

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#include <stdint.h>
 
#include <sys/kassert.h>
#include <sys/irq.h>
 
#include <machine/trap.h>
#include <machine/ioapic.h>
 
LIST_HEAD(IRQHandlerList, IRQHandler);
struct IRQHandlerList handlers[T_IRQ_LEN];
 
void
IRQ_Init()
{
    int i;
 
    for (i = 0; i < T_IRQ_LEN; i++)
    {
        LIST_INIT(&handlers[i]);
    }
}
 
void
IRQ_Handler(int irq)
{
    struct IRQHandler *h;
    LIST_FOREACH(h, &handlers[irq], link)
    {
        h->cb(h->arg);
    }
}
 
void
IRQ_Register(int irq, struct IRQHandler *h)
{
    ASSERT(irq < T_IRQ_LEN);
 
    LIST_INSERT_HEAD(&handlers[irq], h, link);
 
    IOAPIC_Enable(irq);
}
 
void
IRQ_Unregister(int irq, struct IRQHandler *h)
{
    LIST_REMOVE(h, link);
 
    if (LIST_EMPTY(&handlers[irq]))
        IOAPIC_Disable(irq);
}