plan to work on user-level device drivers

[Da Zheng]

Hi,

I am thinking about writing user-level device drivers. When I searched 
Internet, I found the paper "An Architecture for Device Drivers 
Executing as User-Level Tasks" written by David B. Golub, Guy G. 
Sotomayor and Freeman L. Rawson, III. It might be exactly what I want 
but unfortunately, the paper isn't available for downloading on 
Internet. I wonder if anyone knows the work and more importantly, where 
I can download the code.

My plan is to write a user-level device driver for testing and ideally, 
to port ddekit to Mach if it is possible.
The first device I choose will be ethernet card, which I think is the 
one I relatively familiar with.
Any suggestion is welcome!

Zheng Da