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

[Ard Biesheuvel <ard.biesheuvel@linaro.org>]

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?

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