if (sc->lm_media_mode == LAN_MODE_AUTOSENSE)
sc->lm_media = LAN_MEDIA_UTP;
break;
case LAN_MEDIA_BNC:
if (sc->lm_media_mode == LAN_MODE_AUTOSENSE)
sc->lm_media = LAN_MEDIA_AUI;
break;
case LAN_MEDIA_UTP:
default:
if (sc->lm_media_mode == LAN_MODE_AUTOSENSE)
sc->lm_media = LAN_MEDIA_BNC;
break;
}
el_reset(ifp->if_unit);
2
}
}
1
Selects new media.
2
Calls the
el_reset( )
routine to reset the hardware. This reset will
establish the next media to try.
5.3.17 Establishing the Media
The following code shows how the
el_autosense_thread( )
routine
establishes the new media:
}
if (sc->debug) {
if ((sc->lm_media == LAN_MEDIA_UTP) && !link_beat &&
(passes <= EL_AUTOSENSE_PASSES))
printf("el%d: No Link Beat signal\n", ifp->if_unit);
}
sc->lm_media_state = LAN_MEDIA_STATE_DETERMINED;
1
printf("el%d: Autosense selected %s media\n", ifp->if_unit,
lan_media_strings_10[sc->lm_media]);
s = splimp();
2
simple_lock(&sc->el_softc_lock);
3
WRITE_CMD(sc, CMD_STATSDIS);
4
simple_unlock(&sc->el_softc_lock);
5
splx(s);
6
}
}
1
Sets the
lm_media_state
member of the
softc
data structure to
LAN_MEDIA_STATE_DETERMINED
. This indicates that the driver has
successfully selected a media mode.
2
Calls the
splimp( )
routine to mask all LAN hardware interrupts.
Upon successful completion,
splimp( )
stores an integer value in the
s
variable. This value represents the CPU priority level that existed
before the call to
splimp( )
.
3
Calls the
simple_lock( )
routine to assert a lock with exclusive
access for the resource that is associated with the
el_softc_lock
data structure. This means that no other kernel thread can gain access
to the locked resource until you call
simple_unlock( )
to release it.
Implementing the Autoconfiguration Support Section (probe) 5–25
