l4-hackers February 2018

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

9 participants
5 discussions

Fiasco.OC development version available on github
by Matthias Lange 22 Feb '18

22 Feb '18

Hi, Kernkonzept proudly announces the availability of a development version of the Fiasco.OC microkernel on github [1]. It features a detailed history and will be updated regularly. Those interested in exploring the latest changes can amend the latest L4Re snapshot release (see [2]) with this development version. We plan to release development versions of the build system and selected userspace components in the weeks ahead. So, let us know what you think. Cheers, Matthias. [1] https://github.com/kernkonzept/fiasco [2] https://l4re.org/download.html -- Matthias Lange, matthias.lange(a)kernkonzept.com, +49-351-41 888 614 Kernkonzept GmbH. Sitz: Dresden. Amtsgericht Dresden, HRB 31129. Geschäftsführer: Dr.-Ing. Michael Hohmuth

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L4Linux performance vs hardware virtualization
by Bob Liu 12 Feb '18

12 Feb '18

Hi Folks, L4Linux.org mentioned: "Compared to monolithic Linux, there is a small performance tradeoff because of the µ-kernel architecture. However, the initial L4Linux has been somewhat optimized, and on L4/x86 it has a very acceptable slowdown of less than 4 % for any relevant load. " Any place can find more detail about the test? And I'm very curious the L4Linux performance vs "using hardware virtualization on top of L4", have you made any comparison before? -- Thank you! Bob

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Microkernel and alumni meetup
by Matthias Lange 11 Feb '18

11 Feb '18

Dear friends of the microkernel, it's about time for another microkernel and alumni meetup to catch up on all the developments of the last 6 months. Let's meet for a beer or two. To find a date that fits the most people please visit https://dudle.inf.tu-dresden.de/Microkernel_Meetup/ and add your preferred day. Regards, Matthias. -- Matthias Lange, matthias.lange(a)kernkonzept.com, +49-351-41 888 614 Kernkonzept GmbH. Sitz: Dresden. Amtsgericht Dresden, HRB 31129. Geschäftsführer: Dr.-Ing. Michael Hohmuth

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MIPS Creator CI20 patches (again)
by Paul Boddie 06 Feb '18

06 Feb '18

Hello, I recently looked at the collection of patches accumulated when trying to get the CI20 support to a functioning state, and I think I've brought them up to date with the latest upstream repository version (r75). In doing so, I've also tried to break them up into distinct parcels of functionality so that the less interesting or less relevant patches can be ignored. A page describing the patches can be found here: http://www.boddie.org.uk/paul/L4Re-Fiasco.OC.html None of these patches have changed since previous discussions on this topic. The rdhwr instruction support I needed to add, for instance, is still done in MIPS assembly language, fitting in with existing support for another variant of that instruction. Anyway, I thought it might be useful to put them somewhere with a description for future reference. I've yet to get round to looking seriously at L4Re on the CI20 again and it isn't likely to happen now before the end of the year. Paul

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Get instruction opcode + operands for page fault
by Josef Stark 04 Feb '18

04 Feb '18

Hi all, when a page fault occurs, does the Instruction Register contain the actual instruction that caused the fault or the previous instruction? In the former case, how can I access it? I need the opcode + the operands (like source/target registers). I already have the memory address that the instruction tried to access. I'm on ARM A9, so only load/store instructions can cause a page fault. I know that I could also look at the address where my IP is pointing to and get the instruction from there, but I'm wondering which way would be easier/better. Cheers, Josef

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l4-hackers February 2018