Where can I find driver sources (kext) for Mac OS X?

Question

macOS

First of all, the sources of wi-fi cards are of interest. Recently, looking through dozens of foreign forums on Mac OS X and Hackintosh, I found topics where these same source codes were posted. Forum topics not bookmarked, now I can not find.

Answer 1

opensource.apple.com It's called io kit if I'm not mistaken.
PS. I am mistaken - kernel , although I was not completely mistaken ... A lot of time has passed ...