l4-hackers September 2001

l4-hackers@os.inf.tu-dresden.de

11 participants
11 discussions

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 … [View More]

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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 … [View More]

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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). … [View More]

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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 … [View More]

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Re: Recursive mapping trees?
by Jean Wolter 10 Sep '01

10 Sep '01

Martin Young <my(a)siroyan.com> writes: > Thinking it through however it's obvious that a task A can map a page P > to task B which can then map it back to task A at a different virtual > address. Is this allowed in L4? (I assume it is) Is it useful? Could > I get away with not allowing it? I ask because my initial > implementation includes a quick index from a taskid to a node in the > mapping tree (to avoid recursion rather than for speed) but this > requires … [View More]

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Recursive mapping trees?
by Martin Young 07 Sep '01

07 Sep '01

Hi, I've been adding mapping trees to my implementation of L4 and I have a question... The L4 reference manual states that address spaces are constructed recursively. Up 'till now I'd assumed that this was merely notional and that in real systems address spaces would be strictly n-ary trees, not graphs with cycles. Thinking it through however it's obvious that a task A can map a page P to task B which can then map it back to task A at a different virtual address. Is this allowed in L4? (I … [View More]

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Race conditions
by Walt 07 Sep '01

07 Sep '01

Are there any papers that discuss the merits of microkernel and monolithic kernels in terms of race conditions? Regards Edsel __________________________________________________ Do You Yahoo!? Get email alerts & NEW webcam video instant messaging with Yahoo! Messenger http://im.yahoo.com

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compilation errors
by rhim＠ufl.edu 05 Sep '01

05 Sep '01

Hi, while trying to compile the L4 system binaries and support servers, I ran into errors. Following is the snapshot of my system screen. --- make[2]: Entering directory `/root/Fiasco/l4/oskit/libc' gcc -c -MD -DHAVE_CONFIG_H -I. -I../libc/x86 -I../libc/stdio -I../libc/stdlib -I../libc/string -I../libc/gen -I../libc/malloc -I- -I.. -I.. -I../flux/c -nostdinc -DASSEMBLER -MD ../libc/x86/i16_bcopy.S /tmp/ccZPy7Kx.s: Assembler messages: /tmp/ccZPy7Kx.s:235: Error: `8(%ebp)' is not a valid 16 … [View More]

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RE: L$Ka hazelnet kernel pnic
by Volkmar Uhlig 03 Sep '01

03 Sep '01

> When I boot l4ka-i586-dbg-vga (same problem happens with > l4ka-i686-rel-vga) I get a kernel panic. The message is: > startup.c:592: assertion failed (mbi->flags & MULTIBOOT_MODS) > > When I hit "k" to enter the kernel debugger, my machine > simply restarts and POSTs again, followed by my GRUB boot menu. Hi Karl, this sounds like you have problems with your version of GRUB. The error message you get is the resource manager complaining that you did not load any … [View More]

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l4-hackers September 2001