Re: [PATCH v2 1/3] ArmPkg: Add PCDs needed for MM communication driver.

[Supreeth Venkatesh <supreeth.venkatesh@arm.com>]

On Mon, 2017-11-13 at 10:17 +0000, Ard Biesheuvel wrote:
> On 25 October 2017 at 17:32, Supreeth Venkatesh
> <supreeth.venkatesh@arm.com> wrote:
> > 
> > This patch defines PCDs to describe the base address and size of
> > communication buffer between normal world (uefi) and standalone MM
> > environment in the secure world.
> > 
> > Contributed-under: TianoCore Contribution Agreement 1.1
> > Signed-off-by: Achin Gupta <achin.gupta@arm.com>
> > Signed-off-by: Supreeth Venkatesh <supreeth.venkatesh@arm.com>
> > ---
> >  ArmPkg/ArmPkg.dec | 3 +++
> >  1 file changed, 3 insertions(+)
> > 
> > diff --git a/ArmPkg/ArmPkg.dec b/ArmPkg/ArmPkg.dec
> > index f99054a7de..d871ecc654 100644
> > --- a/ArmPkg/ArmPkg.dec
> > +++ b/ArmPkg/ArmPkg.dec
> > @@ -229,6 +229,9 @@
> >    gArmTokenSpaceGuid.PcdSystemMemoryBase|0|UINT64|0x00000029
> >    gArmTokenSpaceGuid.PcdSystemMemorySize|0|UINT64|0x0000002A
> > 
> > +  gArmTokenSpaceGuid.PcdMmBufferBase|0|UINT64|0x00000045
> > +  gArmTokenSpaceGuid.PcdMmBufferSize|0|UINT64|0x00000046
> > +
> Do we need to hardcode this? Is there no way for the non-secure side
> to retrieve this information via SMC calls etc?
> 
This is not in the Specification yet. I am trying to get this added to
specification. Hence, for the time being, we are still using PCDs.

> > 
> >  [PcdsFixedAtBuild.common, PcdsDynamic.common]
> >    #
> >    # ARM Architectural Timer
> > --
> > 2.14.1
> >