linux-kernel - Re: [PATCH] ACPI: make some IO ports off-limits to AML

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Message-id: <alpine.LFD.2.00.0903272127350.26419@localhost.localdomain>
Date:	Fri, 27 Mar 2009 21:30:53 -0400 (EDT)
From:	Len Brown <lenb@...nel.org>
To:	Matthew Garrett <mjg@...hat.com>
Cc:	linux-acpi@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ACPI: make some IO ports off-limits to AML

On Wed, 4 Feb 2009, Matthew Garrett wrote:

> On Tue, Feb 03, 2009 at 10:59:43PM -0500, Len Brown wrote:
> 
> > Start using this interface to prevent AML from accessing
> > some well known IO addresses that the OS "owns".
> 
> It might be nice to extend this to cover the other ports listed at 
> http://www.microsoft.com/whdc/archive/BIOSAML.mspx if (and only if) the 
> firmware requested _OSI("Windows 2001") or later.

Right.  We reverted this initialization-time check for 2.6.29
b/c it had false positives of opregions that were never used.

For 2.6.30 we replaced it with a run-time check, and the check
follows the compatibility rules referenced above.

http://git.kernel.org/?p=linux/kernel/git/lenb/linux-acpi-2.6.git;a=commitdiff;h=7f0719039085cc40114abce84cf29fe57da226f4

cheers,
Len Brown, Intel Open Source Technology Center

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