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2285 discussions

Re: Fiasco.OC thread execution time
by Georg Guba 19 Apr '16

19 Apr '16

Hello Stefan, oh wow. What a beginner's mistake. Thank you. Of course I cast the message register wrong (missing a & there). It seems to be working now: time = *(l4_kernel_clock_t*)&l4_utcb_mr()->mr[0]; Thanks a lot. Best regards, Georg On 23 February 2016 at 09:53, Stefan Kalkowski < stefan.kalkowski@...1...> wrote: > Hello Georg, > > On 02/22/2016 06:38 PM, Georg Guba wrote: > > I'm trying to implement Platform_thread::execution_time() for Fiasco.OC. > > However, when using the code below, I'm getting a null pointer error when > > trying to read the UTCB's message register: > > > > Possible null pointer READ at 0 IP 704c0d7c > > > > unsigned long long Platform_thread::execution_time() const > > { > > unsigned long long time = 0; > > > > if (_utcb) > > { > > l4_thread_stats_time(_thread.local.dst()); > > time = *(l4_kernel_clock_t*)l4_utcb_mr()->mr[0]; > > } > > > > return time; > > } > > > > The doc for l4_thread_stats_time(...) says > > > > /** > > * \brief Get consumed timed of thread in µs. > > * \ingroup l4_thread_api > > * \param thread Thread to get the consumed time from. > > * > > * The consumed time is returned as l4_kernel_clock_t at UTCB message > > * register 0. > > */ > > L4_INLINE l4_msgtag_t > > l4_thread_stats_time(l4_cap_idx_t thread) L4_NOTHROW; > > > > So my usage should be about right. > > What am I missing? > > although, this is a bit off-topic and I did not used the mentioned > kernel feature till now (you might refer to the l4-hackers mailing-list > when having further questions regarding Fiasco.OC and L4Re), I'll try to > help you. > > It seems you expected a pointer in the UTCB to the time structure, but > it is surely a value (the kernel wouldn't know where to deposit the > value aside of the UTCB, it doesn't do memory allocations on behalf of > user tasks). > > When searching for the right usage of "l4_thread_stats_time", I came > across this post on the l4-hackers mailinglist: > http://os.inf.tu-dresden.de/pipermail/l4-hackers/2012/005419.html > > I hope it helps. > > Regards > Stefan > > > > > > > > > > ------------------------------------------------------------------------------ > > Site24x7 APM Insight: Get Deep Visibility into Application Performance > > APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month > > Monitor end-to-end web transactions and take corrective actions now > > Troubleshoot faster and improve end-user experience. Signup Now! > > http://pubads.g.doubleclick.net/gampad/clk?id=272487151&iu=/4140 > > > > > > > > _______________________________________________ > > genode-main mailing list > > genode-main(a)lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/genode-main > > > > -- > Stefan Kalkowski > Genode Labs > > http://www.genode-labs.com/ · http://genode.org/ > > > ------------------------------------------------------------------------------ > Site24x7 APM Insight: Get Deep Visibility into Application Performance > APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month > Monitor end-to-end web transactions and take corrective actions now > Troubleshoot faster and improve end-user experience. Signup Now! > http://pubads.g.doubleclick.net/gampad/clk?id=272487151&iu=/4140 > _______________________________________________ > genode-main mailing list > genode-main(a)lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/genode-main >

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Problem with the AHCI driver
by Charles HH 18 Apr '16

18 Apr '16

Hello, I'm trying to create a custom Turmvilla-like scenario on my computer, but I'm running into a problem similar to the one Nobody III experienced ( https://sourceforge.net/p/genode/mailman/genode-main/thread/20150601102048.…) : when trying to access a physical hard disk with ahci_drv and part_blk, both components are launched, and ahci_drv reports the ATA device correctly, but the session is never built (part_blk hangs somewhere in the Driver constructor and ahci_drv never executes the _create_session function of Root_multiple_clients). The test run script works perfectly on Qemu however, and the content of the drive is read correctly. I experienced the same issue on my laptop, but I couldn't get any debug information because it doesn't have a serial port. Enabling or disabling IOMMU didn't affect the outcome. Did I miss something or is the hardware I'm using simply unsupported (the computer from which the linked logs where obtained is a Dell Optiplex 7010 with a c216 chipset) ? Should I open a new issue on the GitHub ? Regards, Charles

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Some inter thread/component communication questions
by Menno Valkema 14 Apr '16

14 Apr '16

Hi Everyone, I've some questions with regards to Genode synchronization features between threads and components. First a question about packet streams: 1) Can we expect the packet streams to deliver packets in order to the other component as a FIFO? Thus: can we expect the packet submitted first, to be delivered first at the other component? Also when bursts of packets are send through the packet stream? Other questions are with regards to synchronization between multiple threads within the same component: 2) Say we have 2 threads in the same component, where Thread A needs to sleep until an event occurs in Thread B. How to address this? If A and B were components, signals would be the answer. Would signals also work between threads within the same component or is there some other approach? 3) What if those same 2 threads need to exchange data? When data is shared between components, shared memory would be the answer. How to approach this with 2 threads within the same component. Setup a shared data space? Do those 2 threads share the same heap which we can use for this exchange? Thanks for thinking along. Kind regards, Menno PS. The first question is a repost, I noticed in my previous email the subject was partially discarded. Sorry about that. -- Cyber Security Labs B.V. | Gooimeer 6-31 | 1411 DD Naarden | The Netherlands | https://nlcsl.com

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Shared Memory in tz_vmm demo
by Joseph Lee 14 Apr '16

14 Apr '16

Hi, I used "*dma_alloc_coherent( )"* as described in this thread ( https://sourceforge.net/p/genode/mailman/message/34685275/) to allocate shared memory between the trustzone worlds in the tz_vmm example on i.mx53 qsb. It works well. But my questions is how do we prevent the normal world from modifying this shared buffer while it is being used by the secure world. Thanks in advance for answers. Kind regards, Joseph

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Do packet streams deliver p
by Menno Valkema 13 Apr '16

13 Apr '16

Hi Everyone, Can we expect the packet streams to deliver packets in order to the other component as a FIFO? Thus: can we expect the packet submitted first, to be delivered first at the other component? Also when bursts of packets are send through the packet stream? Thanks, Menno -- Cyber Security Labs B.V. | Gooimeer 6-31 | 1411 DD Naarden | The Netherlands | https://nlcsl.com

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JTAG Debug on the i.MX53 QSB
by João Rocheteau Ramos 12 Apr '16

12 Apr '16

Hello Genode Community, I'm working with Genode in a project and wanted to use a JTAG Debugger with my i.MX53 QSB. Does anybody know any good documentation and have a recommendation? Thank you. Best Regards, João Ramos

2 1

Process migration and persistence
by Daniel Waddington 04 Apr '16

04 Apr '16

Hi Genode world, I'd like to be able to freeze a process (PD or even a vmm), make it persistent, and unfreeze at some later point in time. Does anyone have suggestions/pointers on how to do this? Daniel

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Golang on Genode
by Petar Stupar 04 Apr '16

04 Apr '16

Hi everyone, I'd like to be able to write servers and clients for Genode in Golang. I believe this is currently possible only through gccgo (as I see go is supported by Genode tool-chain) but I'd like to be able to use the native compiler and all of its standard library. I don't think this would be a hard task albeit a bit more involved. First I'd need to port and build an older Golang tool-chain (version 1.3 or 1.4, not sure which of the two is the latest possible) and then bootstrap a newer one. Does this sound about right? What my questions/concerns are: 1. Has there been any previous work done on this or in this direction? 2. Is there any reason why Golang wouldn't be a good choice as a language on top of Genode? Although this seems to me as a very intuitive combination perhaps there are concept/security issues I might have overlooked. 3. Is there any work work being done or work that has been planned already to be done on Genode which could influence the Golang port and it's standard library? I've gone through the Road Map and several things popped out to me which might have some influence like cross-kernel binary compatibility and work to be done on networking stack. 4. Would adding Golang programs into the mix be an issue for the build system? The Genode build system is such a powerful feature and I'd like to think it will be easy and quite natural to integrate it with Golang's build system too, but maybe I'm wrong. I'd be very grateful if I could hear your thoughts and pick your brains before I start. Any suggestions and comments are very welcome. Regards, Peter

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Microkernel Meetup
by Bjoern Doebel 03 Apr '16

03 Apr '16

Hi all, it is time for another meeting of current and former microkernel enthusiasts in Dresden. I prepared a Dudle to find a suitable time: http://dudle.inf.tu-dresden.de/mks-0316/ and will let you know about a location once we settled on a date. Looking forward to your replies! Bjoern

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using picture from Genode Foundations for Thesis
by David Werner 03 Apr '16

03 Apr '16

Hi Genode mailing list, i am currently writing my Bachelor's thesis. Am i allowed to use pictures from "Genode Foundations" Regards, David

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