L4/Alpha palcodes

Adam 'WeirdArms' Wiggins awiggins at cse.unsw.edu.au
Tue Jan 22 09:51:34 CET 2002


	Dresden proposed a user mode L4 project. Ie running L4/(arch blah)
on top of Linux/(arch blah).

	Cheers, Adam

On Tue, 22 Jan 2002, Daniel Potts wrote:

> On 22 Jan 2002, Goswin Brederlow wrote:
>
> > Hi,
> >
> > I hope this is the right place, havent read anything here for ages.
> >
> >
> > I was wondering whether the palcodes used by L4 on Alpha are disjunct
> > to the ones used by OSF / BSD / Linux.
>
> yes they are. An exception is l4_whoami which is an experimental syscall
> anyway. I think it maps directly to the OSF whoami call.
>
> >
> > If not could they be made disjunct?
> >
> >
> > The idea I have in mind is to make a module for linux that catches the
> > L4 syscalls and throws them back into user-space. That way a L4
> > environment could be setup within linux.  It would be much like
> > user-space-linux and would save a lot of reboots just to test out a
> > few bytes of code.
>
> heh :) That would be an interesting project. I'd be interested to know
> how (if) you will deal with device drivers, memory etc.
>
> > On the other hand, inside L4 you could do the same with OSF / BSD /
> > Linux syscalls and thus run their binaries under L4. (You want to run
> > Netscape under L4? Or Mathematica? Or something as simple as xemacs
> > and gcc?)
> >
> >
> > A l4-linux for alpha would also need those changes (if any) I believe.
>
> Yes that is how we would run unmodified Linux/Alpha binaries on L4..
>
> Cheers,
> Daniel
>
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