linux-kernel - Re: FP in kernelspace

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Date:	Sun, 30 Jul 2006 17:08:13 +0159
From:	Jiri Slaby <jirislaby@...il.com>
To:	Arjan van de Ven <arjan@...radead.org>
CC:	Avi Kivity <avi@...o.co.il>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: FP in kernelspace

Arjan van de Ven wrote:
>>> So 2 questions are:
>>> 1) howto FP in kernel
>>>
>> kernel_fpu_begin();
>> c = d * 3.14;
>> kernel_fpu_end();

Yup, I know about this possibility, but this is only x86 specific?!

> unfortunately this only works for MMX not for real fpu (due to exception
> handling uglies)

concludes it's not multiplatform at all... For that reasen I (maybe) want some 
"protocol" for communication with US, where I can easily compute it.

Another way could be rtai (there is FP implemented IIRC), but it means having 
out-of-kernel driver.

thanks,
-- 
<a href="http://www.fi.muni.cz/~xslaby/">Jiri Slaby</a>
faculty of informatics, masaryk university, brno, cz
e-mail: jirislaby gmail com, gpg pubkey fingerprint:
B674 9967 0407 CE62 ACC8  22A0 32CC 55C3 39D4 7A7E
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