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first steps towards interrupts support;
intr_establish() and intr_disestablish() can be used by devconfig to register (and unregister)
interrupts handlers during device attachment. intr_execute() is used to quick execute (registered) handler by passed intrno.

still more work to do.

/*
 * $Id: kern_irq.h,v 1.1 2007/11/02 11:40:02 init Exp $
 */
#ifndef _SYS_KERN_IRQ_H
#define _SYS_KERN_IRQ_H

#include <sys/types.h>
#include <sys/device.h>

struct intr_vector {
	uint8_t 		iv_intrno;							/* interrupt number in attachinfo */
	struct device 	*iv_device;							/* associated device */
	void 			(*iv_intrfunc)(struct device *);	/* interrupt handler in device driver */

	struct intr_vector *iv_next; 						/* next vector in linked list */
};


void intr_establish(uint8_t intrno, struct device *device, void (*intrfunc)(struct device *));
void intr_disestablish(uint8_t intrno);
void intr_execute(uint8_t intrno);

#endif /* not _SYS_KERN_IRQ_H */