Let's say I have a PCI device with more than one function, and the
device has some I/O map register that is shared between the two
functions (that is the register points to the same io address).

How can this be handled when attaching the device? I would like to get
a pointer (or something) to the first function when attaching the
second.

The same problem arises with registers that `should be written only
through function 0'.

Is there some code that does something like this in the tree?

/Johan