Messages in this thread | | | Date | Sun, 24 Nov 2002 01:39:44 -0800 | From | george anzinger <> | Subject | Re: switching to interrupt contex when no interrupts |
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arun4linux wrote: > > Hello, > > <<One is forced to run in interrupt context in an > interrupt handler. > >>Yes. But my requirement is to force my code to run in interrupt context. > > <<Possibility is undefined here because what you said makes no sense. > > You will get a better answer from the list if you describe what you are trying to do (in concrete terms), not how you think you might do it. > > >>My requirement is to simulate a PCI based controller and its behaviour in software. I knew the different type of interrupts and the timings my device produces. > > I need to simulate this PCI device, its interrupts in sequence and I have to process them in my driver software. > > Hope this make sense now. > > Anyway, my requrirement is to simulate the interrupts and process them in the interrupt context. > > It would be helpful, if anyone could help me how to do it. > My idea is to use task queues and bottom halves for this. But I'd like to get clarified on simulating interrupts (rasing the process/task context to interrupt context) and its consequences. > Why simulate the interrupts when you can just program them? On the x86 machine the "int x" instruction generates an interrupt to irq "x"+32. You do need to be in kernel land to do this, but then I assume that is not a problem.
-g
> > Thanks & Warm Regards > Arun > > "John K Luebs" wrote: > > On Sat, Nov 23, 2002 at 07:37:33AM +0530, arun4linux wrote: > > Hello, > > > > I'd like to force my kernel module to run at interrupt context at some specific points/time and then come back from interrrupt contex after executing that particular portion of code.. > > You seem to be over complexifying what interrupt context is. It is > simply a generic term for a context that executes on account of an > architecture interrupt. One is forced to run in interrupt context in an > interrupt handler. > > You "run" in interrupt context by calling request_irq attached to the > interrupt line that you are interested in installing a handler for. > > > > > Is it possible? > > Possibility is undefined here because what you said makes no sense. > > You will get a better answer from the list if you describe what you are > trying to do (in concrete terms), not how you think you might do it. > > Get Your Private, Free E-mail from Indiatimes at http://email.indiatimes.com > > Buy Music, Video, CD-ROM, Audio-Books and Music Accessories from http://www.planetm.co.in > > - > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/
-- George Anzinger george@mvista.com High-res-timers: http://sourceforge.net/projects/high-res-timers/ Preemption patch: http://www.kernel.org/pub/linux/kernel/people/rml - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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