linux-kernel - Re: [PATCH v5 1/5] ARM: add basic Trusted Foundations support

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Message-ID: <20130910130431.GE27966@mudshark.cambridge.arm.com>
Date:	Tue, 10 Sep 2013 14:04:31 +0100
From:	Will Deacon <will.deacon@....com>
To:	Alexandre Courbot <gnurou@...il.com>
Cc:	Rob Herring <robherring2@...il.com>,
	Mark Rutland <Mark.Rutland@....com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Kevin Hilman <khilman@...aro.org>,
	Russell King <linux@....linux.org.uk>,
	Arnd Bergmann <arnd@...db.de>,
	Stephen Warren <swarren@...dotorg.org>,
	Tomasz Figa <t.figa@...sung.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	Alexandre Courbot <acourbot@...dia.com>,
	Olof Johansson <olof@...om.net>,
	Dave P Martin <Dave.Martin@....com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v5 1/5] ARM: add basic Trusted Foundations support

Hi guys,

On Mon, Sep 09, 2013 at 07:15:31AM +0100, Alexandre Courbot wrote:
> On Fri, Sep 6, 2013 at 3:35 AM, Rob Herring <robherring2@...il.com> wrote:
> > On 09/04/2013 10:27 PM, Alexandre Courbot wrote:
> >> Trusted Foundations is a TrustZone-based secure monitor for ARM that
> >> can be invoked  using a consistent SMC-based API on all supported
> >> platforms. This patch adds initial basic support for Trusted
> >> Foundations using the ARM firmware API. Current features are limited
> >> to the ability to boot secondary processors.

[...]

> >> +Example:
> >> +     firmware {
> >> +             compatible = "tl,trusted-foundations";
> >> +             version-major = <2>;
> >> +             version-minor = <8>;
> >> +     };
> >
> > I'm wondering how we fit this in with PSCI bindings? Both are pieces of
> > firmware functionality and may co-exist. There's nothing incompatible
> > here, but there should be some commonality. Will future versions of
> > Trusted Foundations follow the SMC calling conventions doc? What about
> > armv8 support.
> 
> I don't have any information about the future of TF unfortunately,
> excepted that it should remain backward-compatible. What is this SMC
> calling convention doc your are talking about btw? Is there a standard
> calling convention defined by ARM?

SMC calling convention:

https://silver.arm.com/download/download.tm?pv=1435186

PSCI:

https://silver.arm.com/download/download.tm?pv=1421585

Although access to these documents requires you to go through a
click-through license.

Will
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