Function intr_map_init

freebsd/kern/subr_intr.c:1724–1733

}

static void
intr_map_init(void *dummy __unused)
{

	mtx_init(&irq_map_lock, "intr map table", NULL, MTX_DEF);

	irq_map_count = 2 * intr_nirq;
	irq_map = mallocarray(irq_map_count, sizeof(struct intr_map_entry*),
	    M_INTRNG, M_WAITOK | M_ZERO);
}
SYSINIT(intr_map_init, SI_SUB_INTR, SI_ORDER_FIRST, intr_map_init, NULL);