Re: [elysium-developers] Great news!

[Kasper V. L. <ve...@da...>]

> > [snipped something about a DSM system]
>
> This is great, since exokernels are so flexable we should be able to borrow
> (read steal ;) their code. Do you know what licence this work might be done
> under?

I think I'll be working together with them on this one - and if I get my
way the source code will be GPL'ed (at least open-source).
 
> BTW: Do you update the CVS? It's very `stable'

I've been working on implementing the IRQ handling stuff that has been
discussed - once that is done we should be able to build the first
drivers for our system: the keyboard driver, and the text mode video
driver. It's nearly there... have patience.

On the other hand I wouldn't mind if someone would try implementing a
basic PCT (protected control transfer) mechanism. These system calls
should do the trick:

/* register an PCT upcall entry */
int sys_pct_register(uint32_t entry);

/* do a PCT */
int sys_pct(pid_t pid);

The semantics would be to transfer control to the other process donating
the remaining time-slices of the current quantum to the other process.
It should be fairly simple to implement - add the PCT entry to the
process_s structure, implement the system calls (have a look at
_process_run() for inspiration on doing the upcall)....

/Kasper

-- 
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Kasper Verdich Lund, Computer Science Department, Aarhus University
Office: 34P.218              | Phone: (+45) 8942 5680
Email:  ve...@da...  | WWW: http://www.daimi.au.dk/~verdich