[Xenomai-help] sqrt() function in xenomai kernel module

[Xenomai-help] sqrt() function in xenomai kernel module

[Mathieu JOINIE-MAURIN]

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Hi,

I need to use a sqrt() function in a kernel module code. I am a beginner with Xenomai. Is there any math_module which already exists ?

Thanks in advance,

Mathieu




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Re: [Xenomai-help] sqrt() function in xenomai kernel module

[Jan Kiszka]

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Mathieu JOINIE-MAURIN wrote:
> Hi,
> 
> I need to use a sqrt() function in a kernel module code. I am a beginner with Xenomai. Is there any math_module which already exists ?

Counter question: Why do you need to use math in kernel code? It is
generally a sign something is not well split-up between kernel-based
driver code and user-space RT applications.

To answer your question: No, Xenomai does not come with a kernel math
lib because there is not much use for it - generally. Porting the app to
user-space is recommended.

Jan


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Re: [Xenomai-help] sqrt() function in xenomai kernel module

[Gilles Chanteperdrix]

On 8/29/07, Mathieu JOINIE-MAURIN <mjoiniem@domain.hid> wrote:
>
> Hi,
>
> I need to use a sqrt() function in a kernel module code. I am a beginner
> with Xenomai. Is there any math_module which already exists ?
>
> Thanks in advance,

There is no math module, if you really want to, you can port the
libmath from a c library such as the glibc or uclibc, or newlib and
make it a kernel module. If you do so, we willl be pleased to add this
module to Xenomai.

Now, regarding the sqrt function, if what you want is the integer
square root of an integer argument, you can use the int_sqrt function,
declared in linux/kernel.h.


-- 
                                               Gilles Chanteperdrix