Hi Andrei, > I checked in the MIPS documentation and I couldn't find relevant > information about this particular way of implementation. Unfortunately > in the MIPS kernel source there are no enough comments. With reasonable understanding what the MIPS architecture features covered by these macros, functions, etc. are you should be able to infer from Linux code what it actually does. May I suggest some reading on the architecture first then? I realise MIPS Technologies' architecture specifications may not be the best way to learn how the architecture works, so why not try a MIPS textbook instead, such as Dominic Sweetman's excellent "See MIPS Run Linux" (ISBN 978-0-12-088421-6)? While not covering such details of Linux as you are looking for, it includes related introductory subjects to get you started. And of course it covers the MIPS architecture itself. You may be able to find the book at your nearby (or less near) library. I think it's about as much as we can help -- you need to get down to understanding the details yourself or you'll be bound to asking around helplessly all the time. Maciej