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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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Ulix v0.01 - it begins (01.07.2011)


So here's the beginning of my ULIX blog, and also the beginning of my Ulix-i386 development. I base my work on Felix Freiling's "The Design and Implementation of the ULIX Operating System", an unfinished literate programming document from which parts of an OS theory book (in LaTeX) and parts of a kernel (in C and assembler) can be extracted using the noweb tools (noweave, notangle).

The original code from this document is intended to run on a virtual machine (the ULIX hardware) which is also described in that text and for which parts of a tool chain (emulator, gcc port, assembler) had been created by other students. However, I am implementing Ulix for the i386 architecture. So some of the original code will remain, and some must go.

In this blog I will keep you updated on my progress.

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