From: Jesse Barnes <jbarnes@engr.sgi.com>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Bjorn Helgaas <bjorn.helgaas@hp.com>,
Christoph Lameter <clameter@sgi.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Bob Picco <Robert.Picco@hp.com>,
venkatesh.pallipadi@intel.com
Subject: Re: device driver for the SGI system clock, mmtimer
Date: Thu, 16 Sep 2004 10:07:36 -0700 [thread overview]
Message-ID: <200409161007.37015.jbarnes@engr.sgi.com> (raw)
In-Reply-To: <1095349940.22739.34.camel@localhost.localdomain>
On Thursday, September 16, 2004 8:52 am, 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..
And what about the register layout? mmtimer makes sure that the register is
on a page by itself before it allows the mmap, and only exports the counter
register itself. Can hpet do that?
Jesse
next prev parent reply other threads:[~2004-09-16 17:16 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 [this message]
2004-09-16 18:17 ` Robert Picco
2004-09-16 18:23 ` Jesse Barnes
2004-09-16 18:00 ` Robert Picco
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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