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Date: 30 Jul 2006 19:32:50 +0200 From: Andi Kleen <ak@...e.de> To: Jiri Slaby <jirislaby@...il.com> Cc: linux-kernel@...r.kernel.org Subject: Re: FP in kernelspace Jiri Slaby <jirislaby@...il.com> writes: > I have a driver written for 2.4 + RT patches with FP support. I want > it to work in 2.6. How to implement FP? Has anybody developped some > "protocol" between KS and US yet? If not, could somebody point me, how > to do it the best -- with low latency. > The device doesn't generate irqs Doesn't sound like something that should be supported for mainline then. > So 2 questions are: > 1) howto FP in kernel You can use kernel_fpu_begin()/_end() around the FP code in the kernel, but the real time people will probably hate you for it because it disables preemption. > 3) any way to have faster ticks (up to 5000Hz)? There are plenty of interval timers in various hardware in a typical system that can be used. e.g. RTC is a common choice. Drawback is that you might conflict with other users, especially in user space. But please don't try to submit such a hack. -Andi - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.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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