UX/RT - a Universally eXtensible Real-Time OS

Nils Asmussen nils at os.inf.tu-dresden.de
Wed Jan 28 13:17:40 CET 2015

Hash: SHA256


as you want to build a UNIX-like microkernel-based OS, it might be
interesting for you to look at my OS, Escape [1]. It is some mixture
of UNIX, Plan 9 and L4, I would say. It is not directly related
though, but completely written from scratch and also UNIX-like at its
heart in contrast to emulating that on top. However, since it does not
consider real-time, you probably don't want to use it, but perhaps
it's interesting to see how it works.

Best regards,

[1] https://github.com/Nils-TUD/Escape

On 01/28/2015 02:27 AM, Andrew Warkentin wrote:
> I am planning to write a new L4-based multi-server OS called UX/RT 
> (initially I will use Fiasco.OC as the kernel since it has x86_64 
> support and supports kernel capabilities, but may eventually
> support seL4 as well). Unlike the other current L4 OS environments,
> it will be a multi-server Unix-like OS resembling QNX and Plan 9. I
> am intending it to have good support for both desktop and embedded
> systems (servers are not a huge priority; the microkernel
> architecture might limit the maximum throughput for heavily
> I/O-bound workloads). I am dissatisfied with all the current
> mainstream OSes and want to take on the challenge of making
> something better. I am planning to reuse as much existing 
> third-party code as possible, especially as I will probably be
> working on it alone at first (of course if anybody here wants to
> contribute they can). However, due to the design, the only part of
> L4Re that I can use as-is is sigma0 (which may require minor
> changes to fit into the XIP-based boot process I am going to use).
> I will be implementing my own root task which may use a few parts
> of moe, although I haven't looked too closely at the source for moe
> so I'm not sure if there's anything there that I can use. Other
> than sigma0, the low-level kernel headers, and possibly some parts
> of moe, I'm not sure if there is much else from L4Re (or Genode)
> that would be useful in the context of a pure Unix-like 
> multi-server OS. Most of the code I reuse will come from BSD and
> GNU (which gets me quite far; the root task will probably be the
> biggest part of the base OS that will be primarily original code).
> I already have a very good idea of the design I'm going to use;
> I'll post more about it later.

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