Well this is an excellent resource, BUT it seems devoid of any examples where a custom device driver,
say for the serial port on a linux system,
inserted as a module or is part of the kernel,
and the associate software that allows users
to access some of the hardware(features) and not
other hardware/firmware/kernel features(code), unless
they are root, or have a special (encrypted)key
or another form of chicanery (biometric generated
key).

If you are interested in device drivers and kernel stuff on linux, you might want to check out these fine books:

Linux Device Drivers, 3rd ed. (available online)
http://lwn.net/Kernel/LDD3/

Linux Kernel Development 2nd ed.
http://rlove.org/kernel_book/

Marco
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