module insert question

Hi,

Can you please let me know, what all files does the OS look into to load modules?
I see the following messages during boot rather installation:
======
Finished bus probing
modules to insert tg3 aic79xx
======

which files does the OS look into to load tg3 and aic79xx after finishing bus probing. I guess modprobe.conf, modules.alias, modules.pcimap.

with regards,
Anil