The Implementation of the ULIX Literate Operating System








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A diary documenting the implementation of ULIX-i386

Welcome to the ULIX blog.

Ulix (Literate Unix) is a Unix-like operating system developed at University of Erlangen-Nürnberg. I use D. E. Knuth's concept of Literate Programming for the implementation and documentation. The goal was a fully working system which can be used in operating system courses to show students how OS concepts (such as paging and scheduling) can be implemented. Literate programs are very accessible because they can be read like a book; the order of presentation is not enforced by program logic or compiler restrictions, but instead is guided by the implementer's creative process.

Ulix is written in C and assembler for the Intel architecture. The literate programming part is handled by noweb.

On this page I document my progress with the implementation.

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Processes, little updates, serial console (20.05.2012)

I'm working on the process code. So far I can create the initial process, run it (in usermode) and make it fork (via a syscall). There's also an initial implementation of a simple scheduler that is supposed to switch between tasks 1 and 2 (which does not work yet; after changing to the second process the system crashes, because the stack is corrupt. I can fix the stack, but then I get the same problem when switching back to task 1. So there is some weird error in there).

Other new stuff in Ulix: I have a serial console (thanks to the code from the xv6 operating system, but I'm only using the functionality of duplicating all terminal output in a terminal window on the host (good for long memory dumps which scroll out of the window). I've also added a "hlt" instruction in the kgetch() function, so my notebook does not get hot any longer :)

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