From: Will Deacon <will.deacon-5wv7dgnIgG8@public.gmane.org>
To: Mark Rutland <mark.rutland-5wv7dgnIgG8@public.gmane.org>
Cc: Jens Wiklander
<jens.wiklander-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org,
devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
Arnd Bergmann <arnd-r2nGTMty4D4@public.gmane.org>,
Greg Kroah-Hartman
<gregkh-hQyY1W1yCW8ekmWlsbkhG0B+6BGkLq7r@public.gmane.org>,
Kees Cook <keescook-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>,
valentin.manea-hv44wF8Li93QT0dZR+AlfA@public.gmane.org,
jean-michel.delorme-qxv4g6HH51o@public.gmane.org,
emmanuel.michel-qxv4g6HH51o@public.gmane.org,
javier-5MUHepqpBA1BDgjK7y7TUQ@public.gmane.org,
Jason Gunthorpe
<jgunthorpe-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>,
Michal Simek
<michal.simek-gjFFaj9aHVfQT0dZR+AlfA@public.gmane.org>,
Rob Herring <robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
Subject: Re: [PATCH v6 1/6] arm/arm64: add smccc
Date: Mon, 2 Nov 2015 14:45:22 +0000 [thread overview]
Message-ID: <20151102144521.GG29657@arm.com> (raw)
In-Reply-To: <20151102140313.GG2684@leverpostej>
On Mon, Nov 02, 2015 at 02:03:13PM +0000, Mark Rutland wrote:
> > > > +/**
> > > > + * struct smccc_res - Result from SMC/HVC call
> > > > + * @a0-a3 result values from registers 0 to 3
> > > > + */
> > > > +struct smccc_res {
> > > > + unsigned long a0;
> > > > + unsigned long a1;
> > > > + unsigned long a2;
> > > > + unsigned long a3;
> > > > +};
> > >
> > > Are there any endianness considerations for this structure?
> >
> > No, I can't find anything in the ARM SMC Calling Convention document
> > indicating that.
>
> The calling conventions have no bearing on the structure, which is our
> invention.
>
> We stash register values (which don't have endianness) returned by the
> firmeware into the structure in the sequences above (which appear
> endian-clean to me).
Ah yes, the structure is populated by the kernel not the firmware, so
there's nothing to worry about. Thanks for the explanation.
Will
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next prev parent reply other threads:[~2015-11-02 14:45 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-29 8:21 [PATCH v6 0/6] generic TEE subsystem Jens Wiklander
2015-10-29 8:21 ` [PATCH v6 1/6] arm/arm64: add smccc Jens Wiklander
[not found] ` <1446106888-8983-2-git-send-email-jens.wiklander-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
2015-11-02 11:51 ` Will Deacon
2015-11-02 13:56 ` Jens Wiklander
2015-11-02 14:03 ` Mark Rutland
2015-11-02 14:45 ` Will Deacon [this message]
2015-10-29 8:21 ` [PATCH v6 2/6] drivers: psci: replace psci firmware calls Jens Wiklander
[not found] ` <1446106888-8983-3-git-send-email-jens.wiklander-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
2015-11-02 11:55 ` Will Deacon
[not found] ` <20151102115539.GC29657-5wv7dgnIgG8@public.gmane.org>
2015-11-02 13:08 ` Jens Wiklander
2015-11-02 13:46 ` Will Deacon
2015-10-29 8:21 ` [PATCH v6 3/6] dt/bindings: add bindings for optee Jens Wiklander
2015-11-16 17:01 ` Rob Herring
2015-11-19 9:18 ` Jens Wiklander
2015-11-19 14:30 ` Rob Herring
2015-10-29 8:21 ` [PATCH v6 4/6] tee: generic TEE subsystem Jens Wiklander
2015-10-29 8:21 ` [PATCH v6 5/6] tee: add OP-TEE driver Jens Wiklander
2015-10-29 8:21 ` [PATCH v6 6/6] Documentation: tee subsystem and op-tee driver Jens Wiklander
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