registration of interrupt handlers. All network device drivers are required to
register interrupt handlers.
el_intr_info.configuration_st = (caddr_t)ctlr;
1
el_intr_info.intr = el_intr;
2
el_intr_info.param = (caddr_t)unit;
3
el_intr_info.config_type = CONTROLLER_CONFIG_TYPE;
4
if (ctlr->bus_hd->bus_type == BUS_PCMCIA)
5
el_intr_info.config_type |= SHARED_INTR_CAPABLE;
el_ihandle.ih_bus = ctlr->bus_hd;
6
el_ihandle.ih_bus_info = (char *)&el_intr_info;
7
sc->hid = handler_add(&el_ihandle);
8
if (sc->hid == (ihandler_id_t *)(NULL)) {
9
printf("el%d: interrrupt handler add failed\n", unit);
if (sc->ispcmcia)
pcmcia_unregister_event_callback(card_infop->socket_vnum,
CARD_REMOVAL_EVENT,
(caddr_t)el_card_remove);
if_dealloc(sc->is_ed);
lan_ehm_free(&sc->ehm);
FREE(sc, M_DEVBUF);
return(0);
}
1
Sets the
configuration_st
member of the
el_intr_info
data
structure to the pointer to the
controller
data structure for this
3Com 3C5x9 device.
2
Sets the
intr
member of the
el_intr_info
data structure to
el_intr
, which is the
if_el
device driver’s interrupt handler.
3
Sets the
param
member of the
el_intr_info
data structure to the
controller number for the
controller
data structure for this 3Com
3C5x9 device.
4
Sets the
config_type
member of the
el_intr_info
data structure to
the constant
CONTROLLER_CONFIG_TYPE
, which identifies the
if_el
driver type as a controller driver.
5
If the
if_el
driver operates on the PCMCIA bus, indicates that the
if_el
driver can handle shared interrupts.
6
Sets the
ih_bus
member of the
el_ihandle
data structure to the
bus
data structure for the
if_el
device driver. The
bus
data structure
is referenced through the
bus_hd
member of the
controller
data
structure for this 3Com 3C5x9 device.
7
Sets the
ih_bus_info
member of the
el_ihandle
data structure to the
address of the bus-specific information data structure,
el_intr_info
.
8
Calls the
handler_add( )
routine to register the device driver’s
interrupt handler and its associated
ihandler_t
data structure with
the bus-specific interrupt-dispatching algorithm.
Implementing the Autoconfiguration Support Section (probe) 5–15
