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From: "H. Peter Anvin" <hpa@zytor.com>
To: Jeff Garzik <jgarzik@pobox.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: [RFC] RNG rewrite...
Date: Mon, 17 Oct 2005 17:22:59 -0700	[thread overview]
Message-ID: <43544063.4040602@zytor.com> (raw)
In-Reply-To: <43543331.6030603@pobox.com>

Jeff Garzik wrote:
> 
>> MSR instructions cannot execute out of userspace, but the MSR driver
>> might be possible to use.  It's usually quite slow, however.
> 
> MSRs are used for setup, not for actual data.
> 
> Intel:  magic MMIO address (readb)
> AMD:    magic PIO address (inl)
> VIA:    CPU instruction ('xstore')
> 

For setup, the MSR driver is fine.

	-hpa

  reply	other threads:[~2005-10-18  0:23 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2005-10-15  4:31 [RFC] RNG rewrite Deepak Saxena
2005-10-15 10:40 ` Jeff Garzik
2005-10-16  0:53   ` Deepak Saxena
2005-10-17 23:15     ` H. Peter Anvin
2005-10-17 23:26       ` Jeff Garzik
2005-10-18  0:22         ` H. Peter Anvin [this message]
2005-10-17 23:31     ` Jeff Garzik
2005-10-18  1:00       ` Deepak Saxena
2005-10-18  1:05         ` Deepak Saxena
2005-10-18  1:09         ` Jeff Garzik

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