Compaq AA-RNG2A-TE manual Registering the Interrupt Handler

bcopy(&ee_copy, &sc->eeprom, sizeof(struct w3_eeprom));

}

}

11

1

If this is a multifunction card, reads the EEPROM data and saves it in a temporary data structure, ee_copy. If this is a 3Com 3C562 multifunction PC card, the EEPROM data is located in the card information data structure.

2If this is not a multifunction PC card, the EEPROM data is read directly from the card and saved in the el_sofc data structure.

3Calls the bcmp( ) routine to compare the EEPROM address from the first probe operation to the EEPROM address of the current probe operation.

4If the EEPROM address has changed, converts the original EEPROM address to its canonical form.

5Compares the original EEPROM address to the hardware address that is currently in effect. If they are different, then a previously specified hardware address was used that was different from the address that was found in the EEPROM. In this case, the alternate address is still in effect and no further action needs to be taken.

6If the original EEPROM address is the same as the hardware address that is currently in effect, uses the hardware address that was found in the EEPROM. Because the EEPROM has changed (because the old if_el adapter was removed and a new one inserted), it will be necessary to broadcast the new EEPROM hardware address onto the network to inform the network that there has been a change. This section of code converts the hardware address from the current EEPROM to canonical form in preparation for the broadcast message.

7Saves the new hardware address in the is_addr member of the el_softc data structure.

8If an IP address has been configured for this interface, informs the network that there is a new hardware address for the IP address by sending out an ARP packet.

9Marks this new hardware address as the link address for this interface.

10

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Informs the packet filter of the new hardware address.

Saves the EEPROM contents in the el_softc data structure.

5.1.11 Registering the Interrupt Handler

The following code shows how the el_probe( ) routine registers the interrupt handler. The Writing Device Drivers manual provides detailed information on the data structures and routines that relate to the

5–14Implementing the Autoconfiguration Support Section (probe)