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From: Robert Picco <Robert.Picco@hp.com>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Jesse Barnes <jbarnes@engr.sgi.com>,
	Bjorn Helgaas <bjorn.helgaas@hp.com>,
	Christoph Lameter <clameter@sgi.com>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	venkatesh.pallipadi@intel.com
Subject: Re: device driver for the SGI system clock, mmtimer
Date: Thu, 16 Sep 2004 14:00:34 -0400	[thread overview]
Message-ID: <4149D4C2.5070907@hp.com> (raw)
In-Reply-To: <1095349940.22739.34.camel@localhost.localdomain>

Alan Cox wrote:

>On Iau, 2004-09-16 at 17:09, Jesse Barnes wrote:
>  
>
>>I think Christoph already looked at that.  And HPET doesn't provide mmap 
>>functionality, does it?  I.e. allow a userspace program to dereference the 
>>counter register directly?
>>    
>>
>
>It can do but that assumes nothing else is mapped into the same page
>that would be harmful or reveal information that should not be revealed
>etc..
>
>  
>
HPET driver does provide mmap for user programs. 

I agree with caution of other device registers in the same page. 

  parent reply	other threads:[~2004-09-16 17:55 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2004-09-16 16:03 device driver for the SGI system clock, mmtimer Bjorn Helgaas
2004-09-16 16:09 ` Jesse Barnes
2004-09-16 15:52   ` Alan Cox
2004-09-16 17:07     ` Jesse Barnes
2004-09-16 18:17       ` Robert Picco
2004-09-16 18:23         ` Jesse Barnes
2004-09-16 18:00     ` Robert Picco [this message]
2004-09-16 16:29   ` Marcello Barnaba
2004-09-16 16:30   ` Christoph Lameter
2004-09-16 18:14   ` Vojtech Pavlik
2004-09-16 18:35     ` Jesse Barnes
2004-09-16 20:34       ` Vojtech Pavlik
2004-09-16 18:46     ` Christoph Lameter
2004-09-20 21:53       ` Bjorn Helgaas
2004-09-16 16:32 ` Christoph Lameter
2004-09-16 16:54   ` Bjorn Helgaas
2004-09-16 18:07     ` Robert Picco
2004-09-16 20:05       ` Christoph Lameter
2004-09-17  1:34         ` Robert Picco
2004-09-16 18:17     ` Vojtech Pavlik
     [not found] <Pine.LNX.4.58.0409082058140.28678@schroedinger.engr.sgi.com>
     [not found] ` <20040908210537.585120c1.akpm@osdl.org>
2004-09-09  5:12   ` Christoph Lameter
2004-09-09  6:43     ` Jesse Barnes
2004-09-10 19:54       ` Christoph Lameter
2004-09-11 10:50         ` Christoph Hellwig
2004-09-11 15:32           ` Christoph Lameter

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