linux-kernel - Re: [PATCH 1/4] Documentation: Add memory mapped ARM architected timer binding

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <51672F93.7080109@codeaurora.org>
Date:	Thu, 11 Apr 2013 14:48:03 -0700
From:	Stephen Boyd <sboyd@...eaurora.org>
To:	Mark Rutland <mark.rutland@....com>
CC:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>,
	"devicetree-discuss@...ts.ozlabs.org" 
	<devicetree-discuss@...ts.ozlabs.org>,
	Marc Zyngier <Marc.Zyngier@....com>
Subject: Re: [PATCH 1/4] Documentation: Add memory mapped ARM architected
 timer binding

On 04/11/13 04:24, Mark Rutland wrote:
> Could we say the reg for the second view is optional?
>

Yes, that's already covered in the binding.

> Might we have a hardware / firmware configuration where the kernel can only access
> the secondary view?
>

I don't see how this is possible. The CNTACRn register controls secure
vs. non-secure access for particular registers in a frame regardless of
which view is used. The CNTPL0ACRn is not a security restricted register
and it can only restrict access to certain registers in the second view.
No combination of settings in these registers can restrict access to
only the second view in a frame with two views.

-- 
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
hosted by The Linux Foundation

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/