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member in the driver’s probe interface to the media state constant that
identifies the state for the media.
You can set the lan_media member to the same constants that are
listed for the lan_media_mode member in item 2.
3.4 Defining the Base Register
The base register in a network driver’s softc data structure is a member
that represents the base register of the device. The following code shows
the declaration of the base register in the if_el device driver’s el_softc
data structure. Most network device drivers declare a variable to store the
device’s base register.
vm_offset_t basereg; 1
1 Declares a base register member and calls it basereg.
3.5 Defining Multicast Table Information
All multicast address information in a network driver’s softc data structure
is encapsulated in the lan_multi data structure. The following code shows
the declaration of the lan_multi data structure in the if_el device driver’s
el_softc data structure. Most network device drivers declare this data
structure in their softc data structure.
struct lan_multi is_multi;
1
1 Declares a lan_multi data structure and calls it is_multi.
3.6 Defining the Interrupt Handler ID
The interrupt handler ID in a network driver’s softc data structure is a
variable that stores the interrupt handler ID that the handler_add()
routine returns. The following code shows the declaration of the interrupt
handler ID in the if_el device driver’s el_softc data structure. Make
sure that the interrupt handler ID part of your softc data structure has
a similar declaration.
ihandler_id_t *hid;
1
1 Declares a pointer to an ID that deregisters the interrupt handlers.
3.7 Defining CSR Pointer Information
The control and status register (CSR) addresses in a network driver’s
softc data structure consist of specific adapter register addresses. These
registers generally consist of the base register plus some offset, as defined
by the network adapter’s hardware specification. Make sure that you never
3–6 Defining the softc Data Structure