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Writing device drivers for L4 (was Re: Hurd/Mach on L4)
by Michael Hohmuth 12 Oct '01

12 Oct '01

Farid Hajji <farid.hajji(a)ob.kamp.net> writes in l4-hurd: [...] > The second pressing point is to write/port a very small subset of device > drivers to L4. We need a native L4 driver for ATAPI (or SCSI?) disks, > so that the pager can use a real disk as backing store, and so that > we can port a filesystem as well ;). Here too, no-one volunteered yet. We in Dresden have extensive experience in porting Linux device drivers to run directly on top of L4, so if you guys have questions, don't hesitate to ask on the L4-hackers mailing list <l4-hackers(a)os.inf.tu-dresden.de>. Currently, some of my colleagues are working on a framework that allows you to (more or less) drop a Linux driver in a preconfigured source tree and get a working driver that runs on the x86 L4 kernels (L4/x86, Fiasco, L4KA). This framework, which will work with the L4Env environment we're developing, is not quite ready yet, but it might be worth the wait. As an alternative, consider using the OSKit. We have developed a compatibility library that allows you to run applications using the OSKit (including the OSKit's device drivers) on top of L4. This work is a bit unpolished and the drivers are slow, but it's quite easy to use. I even wrote a technical report on it: <URL:http://os.inf.tu-dresden.de/~hohmuth/prj/oskit-l4.ps.gz>. (You can find this and other reports in the L4 Developer's bibliography at <URL:http://os.inf.tu-dresden.de/L4/bib.html>.) Michael -- hohmuth(a)innocent.com, hohmuth(a)sax.de http://www.sax.de/~hohmuth/

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Re: Cross Compile Needed?
by Michael Hohmuth 11 Oct '01

11 Oct '01

Ian Duggan <ian(a)ianduggan.net> writes: > I'm working to try to build the fiasco kernel for a pentium machine that > I have. I'm working from a Debian PIII. Will I need to build a > cross-compiler to produce code for the pentium machine? No, you can use your Linux installation's native compiler. > Working from the fiasco CVS, I can see how to invoke the --host options > for "configure" of oskit and oskit10. Is there anything similar for > doing this with the L4 module? No, the compiler L4 uses is configured in l4/Makeconf. On Linux/x86 systems, it's just `gcc', on other systems its usually `i386-linux-gcc'. Michael -- hohmuth(a)innocent.com, hohmuth(a)sax.de http://www.sax.de/~hohmuth/

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Re: Code Repository
by Michael Hohmuth 11 Oct '01

11 Oct '01

Ian Duggan <ian(a)ianduggan.net> writes: > Who is the maintainer for the current L4/Fiasco CVS? If I have patches > to add to L4/Fiasco, to whom do I send them? The best place to send them to is the Dresden's bug-tracking system at <fiasco-bugs(a)os.inf.tu-dresden.de> (don't be fooled by the name -- use this address for L4- and Fiasco-specific changes alike). If your patches are Fiasco-specific, you can also send them for review directly to <fiasco-core(a)os.inf.tu-dresden.de>. Regards, Michael -- hohmuth(a)innocent.com, hohmuth(a)sax.de http://www.sax.de/~hohmuth/

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Code Repository
by Ian Duggan 11 Oct '01

11 Oct '01

Who is the maintainer for the current L4/Fiasco CVS? If I have patches to add to L4/Fiasco, to whom do I send them? -- Ian ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Ian Duggan ian(a)ianduggan.net http://www.ianduggan.net

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Cross Compile Needed?
by Ian Duggan 08 Oct '01

08 Oct '01

Hi, I'm working to try to build the fiasco kernel for a pentium machine that I have. I'm working from a Debian PIII. Will I need to build a cross-compiler to produce code for the pentium machine? Working from the fiasco CVS, I can see how to invoke the --host options for "configure" of oskit and oskit10. Is there anything similar for doing this with the L4 module? -- Ian ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Ian Duggan ian(a)ianduggan.net http://www.ianduggan.net

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GNULLI
by Frédéric BOYER 27 Sep '01

27 Sep '01

Hello, I think that the best way to "port" GNAT on top of L4 is to port GNARL and rewrite GNULL lib. GNAT is the run time library but is almost portable. Modification in this package will be minor (Exception, interuption, etc). GNULL (Low Level lib) have to be rewritten entierly. Actually GNULL is port on Pthead lib & win thread. There are minor port to jtk (an other implementation of thread on linux computer .. it's a native one) or FSU. There are also port on micro kernel as Ravenskar or Mach (See MarteOS project). Maybe it could be cool to implements the GNULLI on top of L4, by define an interface beetween L4 & GNULLI to make it portable beetween implementation. After we could write some servers to implements the entire GNAT lib and Posix 1003.5 binding. But it's another story. Some specialized annexes could be implemented too (Real time, Distributed sys, etc.) best regards .. Frederic. ___________________________________________________________ Do You Yahoo!? -- Un e-mail gratuit @yahoo.fr ! Yahoo! Courrier : http://fr.mail.yahoo.com

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gnarl on top of L4
by Frédéric BOYER 27 Sep '01

27 Sep '01

Hello, Just a little word about GNAT library design. GNAT lib is design over 3 layers. 1/ Applications 2/ The second layer (GNARL) is a threads independant manipulation lib. This lib is needed by the compiler and is the Run Time Lib of GNAT. 3/ the GNULL (Low level) is the OS/Hardware dépendant lib to implements Thread system. The lib is often build on Posix Thread. On W2000, this lib is implemented on top of win32 lib. Interface beetween Application & GNARL is called GNARLI, interface beetween GNARL & GNULL is called GNULLI. If you want to write servers in Ada with GNAT on top of L4, you can do it in several ways : 1/ Use pragma No_Run_Time. In this case, GNAT never use is lib. You can no more use task, hight level array fonctionnalities, .. see GNORT (no_run_time) documentation on adacore web site 2/ Implement the GNULLI interface. Ravenskar ORK use this way to port GNAT on their micro kernel. 3/ Implement the GNARL .. I gonna to choose the second way. Maybe we could defined a interface beetween GNULL & L4 to be hardware/kernel independ, to make our version of GNULL portable beetween L4 implementation. best regards .. Frederic. ___________________________________________________________ Do You Yahoo!? -- Un e-mail gratuit @yahoo.fr ! Yahoo! Courrier : http://fr.mail.yahoo.com

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L4 & Ada
by Frédéric BOYER 26 Sep '01

26 Sep '01

Hello, My project is not a real project in sens that it's only for fun. My main goal is to provide a little (R.T. if possible) Unix like O.S. as QNX or Plan9 on top of L4. I start on top of a micro kernel write in C, but if an Ada implementation exists (and works ;)), I will choose it will be choosen in priority. For now a study design concept of the O.S. By now, I follow exactly the User Guide Manual, with the typical OS example. I've created a sourceforge site & M.Ls. (search ADX). There is no traffic actually. Best regards .. Frédéric. ___________________________________________________________ Do You Yahoo!? -- Un e-mail gratuit @yahoo.fr ! Yahoo! Courrier : http://fr.mail.yahoo.com

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GNURL on top of L4
by Frédéric BOYER 25 Sep '01

25 Sep '01

Hello .. I'd like to find people here who can help me to build GNURL on top of L4 (GNAT Run time lib). I'd like to use L4 to develop an RT unix like O.S., but I'd like to implement it in Ada. Any people interested ? Is there people who know Ada here ? bye bye Frederic BOYER. ___________________________________________________________ Do You Yahoo!? -- Un e-mail gratuit @yahoo.fr ! Yahoo! Courrier : http://fr.mail.yahoo.com

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Re: GNURL on top of L4
by Michael Hohmuth 25 Sep '01

25 Sep '01

Frédéric BOYER <askliepios(a)yahoo.com> writes: > I'd like to find people here who can help me to build > GNURL on top of L4 (GNAT Run time lib). I'd like to > use L4 to develop an RT unix like O.S., but I'd like > to implement it in Ada. > > Any people interested ? Is there people who know Ada > here ? This sounds like a cool project. Do you envision a particular application, or are you interested in it just for hack value? Our group in Dresden currently has no ADA expertise or experience. However, depending on your project's focus, we might be willing to help out by directing students to your project and allowing them to earn credits this way. Michael -- hohmuth(a)innocent.com, hohmuth(a)inf.tu-dresden.de http://home.pages.de/~hohmuth/

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