Although if this code is in the kernel I really don't have a development environment setup to compile it- Cygwin just won't cross-compile a linux kernel.

Not a problem, I can compile it just fine. I just wasn't able to get the volume-scaling of the PCM overlay to work right, though I only spent about 20 minutes on it at the time. I was probably making it more complicated than it needs to be, but assembly's never been my strong suit.

Edit: BTW here's an ARM instruction set cheat sheet that might be helpful.