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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v0.10: VFS, switch to kernel shell (and back) (07.01.2014)

The Virtual Filesystem (VFS) mentioned in the 0.09 news is complete now which means: we can 'cd' to directories on mounted media, read, write, and delete files and show directory contents.
Entering the kernel mode shell via Shift+Esc (which was possible before) is no longer a one-way ticket, typing exit brings us back to the user mode program.
Also, the "ULIX lectures" (the OS development course at TH Nuremberg) is about to end soon, with most of the ULIX code presented during the lectures (or worked on/rebuilt in the tutorial sessions).
What's left for ULIX? Signaling, Page Replacement, User mode synchronization.

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