This guy is WildBoar Scafa: Simple and very compact learning tool "nano kernel" for Itanium  processor environment (IA64)   Direct link to the source code of WBS 
 
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Intel's Itanium Systems Architecture and System Programmer's guide has 676 pages and about 30 lines of example code (one line/20 pages). My code can be seen as a manual extension: about 1500 code lines makes 2 lines/ manual page. It is by no means a full scale operating system but a learning tool.

Key words:  kernel, tutorial, Itanium, ia64, HW/SW- interface, system call (API), conext switch, pre-emptive, semaphore, message, shared memory, virtual memory, TLB- translations, backing store, RSE, demand paging, epc, test task.
    

An other small exercise: Linux kernel (3.2.0) module (LKM) rootkit, links:


            Entertainment:

         



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