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List:       kernelnewbies
Subject:    Re: MMX code in kernel modules
From:       Timur Tabi <ttabi () interactivesi ! com>
Date:       2000-09-12 17:08:37
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** Reply to message from Timur Tabi <ttabi@interactivesi.com> on Tue, 12 Sep
2000 11:57:57 -0500

> What about interrupt handlers?  Can I use MMX operations inside an interrupt
> handler?

I think I just answered my own question.  In mmx.c, I found this:

void mmx_copy_page(void *to, void *from)
{
	if(in_interrupt())
		slow_copy_page(to, from);
	else
		fast_copy_page(to, from);
}

slow_copy_page doesn't use MMX, but fast_copy_page does.



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Timur Tabi - ttabi@interactivesi.com
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