How to get PCI Private Driver Data Pointer?

[Farhan Khan]

Hi all,

I am trying to figure out how FreeBSD's PCI kernel modules work, maybe to do some light porting from Linux.

My understanding is that during the

attach

call, the device will provide the driver with a pointer to a list of function pointers, which, when parsed, can be used to perform I/O operations. This understanding stems from a comparable method in Linux, specifically these lines https://github.com/lwfinger/rtlwifi_new/blob/master/pci.c#L2223-L2226 where the PCI and Realtek private driver data pointers are assigned and then utilized by the read/write/configure operations.

If this understanding is correct, how is this done in FreeBSD? I cannot seem to find the equivalent code in the

attach

function here: https://github.com/freebsd/freebsd/blob/master/sys/dev/ath/if_ath_pci.c#L234

Thank you

 

[SirDice]

This might help: FreeBSD Architecture Handbook: Chapter 11. PCI Devices