[edk2-devel] [edk2-platforms][PATCH v1 1/1] IntelSiliconPkg: Add BaseSmmAccessLibNull
Michael Kubacki
mikuback at linux.microsoft.com
Thu Aug 19 16:53:09 UTC 2021
I don't understand your argument.
The library class (SmmAccessLib) that already exists is the abstraction
layer. This is not introducing a new layer of abstraction. It is using
the current layer of abstraction.
Thanks,
Michael
On 8/19/2021 5:49 AM, Ni, Ray wrote:
> Michael,
>
> I don’t think scenario #1 is a good reason for NULL instance of
> SmmAccessLib. The root cause is BoardInitLib lib class supports pre-mem
> and post-mem board init.
>
> Below solution can avoid NULL SmmAccessLib:
>
> Create two instances of BoardInitLib for pre-mem and post-mem. Pre-mem
> one doesn’t link to SmmAccessLib.
>
> For scenario #2, if a particular platform doesn’t support S3, why does
> this platform include the PEIM?
>
> Please understand that I want to avoid introducing more abstraction layers.
>
> Thanks,
>
> Ray
>
> *From:* Michael Kubacki <mikuback at linux.microsoft.com>
> *Sent:* Friday, August 13, 2021 10:16 AM
> *To:* Ni; Ni, Ray <ray.ni at intel.com>; devel at edk2.groups.io
> *Subject:* Re: [edk2-devel] [edk2-platforms][PATCH v1 1/1]
> IntelSiliconPkg: Add BaseSmmAccessLibNull
>
> Sure.
>
> Scenario #1:
>
> MinPlatformPkg/PlatformInit/PlatformInitPei/PlatformInitPreMem.inf and
> MinPlatormPkg/PlatformInit/PlatformInitPei/PlatformInitPostMem.inf both
> link against an instance of BoardInitLib.
>
> Many boards link against a single BoardInitLib instance. See example -
> https://github.com/tianocore/edk2-platforms/blob/cd4e6b716c7d1bcde94035e7dce14b53a553e103/Platform/Intel/KabylakeOpenBoardPkg/KabylakeRvp3/OpenBoardPkg.dsc#L203
> <https://github.com/tianocore/edk2-platforms/blob/cd4e6b716c7d1bcde94035e7dce14b53a553e103/Platform/Intel/KabylakeOpenBoardPkg/KabylakeRvp3/OpenBoardPkg.dsc#L203>
>
> That BoardInitLib instance may link against SmmAccessLib.
> PlatformInitPreMem may wish to library class override the SmmAccessLib
> to the NULL instance while keeping it to non-NULL instance in
> PlatformInitPostMem.
>
> Scenario #2:
>
> A PEIM is built that checks whether the boot mode is S3. If so, it calls
> PeiInstallSmmAccessPpi(). A particular platform does not support S3,
> therefore, it links BaseSmmAccessLibNull as its library instance for
> SmmAccessLib.
>
>
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