It's documented in The Book, somewhere...

It's all magic. :-)

It won't be covered in the book. The source code has to be useful for something, after all... :-)

It is, of course, written in Perl. Translation to C is left as an exercise for the reader. :-)

Let's say the docs present a simplified view of reality... :-)

I spent this time polishing up the software/hardware documentation, renaming registers to be more meaningful. This was actually time well spent in my life.

Reading computer manuals without the hardware is as frustrating as reading sex manuals without the software.