linux-kernel - Re: [PATCH 1/5] msm: Secure Channel Manager (SCM) support

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Message-ID: <20101206205217.GJ31777@n2100.arm.linux.org.uk>
Date:	Mon, 6 Dec 2010 20:52:17 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Valdis.Kletnieks@...edu
Cc:	Jeff Ohlstein <johlstei@...eaurora.org>,
	Daniel Walker <dwalker@...eaurora.org>,
	linux-arm-msm@...r.kernel.org,
	Abhijeet Dharmapurikar <adharmap@...eaurora.org>,
	Stephen Boyd <sboyd@...eaurora.org>,
	linux-kernel@...r.kernel.org,
	Bryan Huntsman <bryanh@...eaurora.org>,
	David Brown <davidb@...eaurora.org>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 1/5] msm: Secure Channel Manager (SCM) support

On Mon, Dec 06, 2010 at 03:00:48PM -0500, Valdis.Kletnieks@...edu wrote:
> On Sun, 05 Dec 2010 23:16:14 PST, Jeff Ohlstein said:
> 
> > SCM is the protocol used to communicate between the secure and
> > non-secure code executing on the applications processor. 
> 
> Does the presence of SCM hardware imply SMP?  From reading this, it's unclear
> why the dependence on SMP - it looks like scm.c is something that hardware that
> has one ARM processor and a 'secure processor' would still want.  Or is the
> 'secure processor' just another (arbitrarily labeled) ARM CPU participating
> as a full SMP processor?

It's referring to the secure mode, which is a separate address space and
system running on the same CPU.
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