Function pic_create

freebsd/kern/subr_intr.c:762–786

* Create interrupt controller. */

 *  Create interrupt controller.
 */
static struct intr_pic *
pic_create(device_t dev, intptr_t xref, int flags)
{
	struct intr_pic *pic;

	mtx_lock(&pic_list_lock);
	pic = pic_lookup_locked(dev, xref, flags);
	if (pic != NULL) {
		mtx_unlock(&pic_list_lock);
		return (pic);
	}
	pic = malloc(sizeof(*pic), M_INTRNG, M_NOWAIT | M_ZERO);
	if (pic == NULL) {
		mtx_unlock(&pic_list_lock);
		return (NULL);
	}
	pic->pic_xref = xref;
	pic->pic_dev = dev;
	pic->pic_flags = flags;
	mtx_init(&pic->pic_child_lock, "pic child lock", NULL, MTX_SPIN);
	SLIST_INSERT_HEAD(&pic_list, pic, pic_next);
	mtx_unlock(&pic_list_lock);

	return (pic);
}
#ifdef notyet
/*
 *  Destroy interrupt controller.