best wishes,

At 2023-11-18 00:04:26, "Michael Kubacki" <mikuback@linux.microsoft.com> wrote:
>On 11/17/2023 3:42 AM, Laszlo Ersek wrote:
>> On 11/17/23 03:15, Yoshinoya wrote:
>>> Hi,
>>> I find there is a PrmPkg in udk source code.
>>> Based on its Readme.md, its goal is to offload smm code to sci os
>>> mechanisms.
>>>
>>> So, is there any actual use case on real platform now?
>>>
>>> It seems it's just a conceptional prototype.
>> 
>> It's way too big for it to be unused.
>> 
>> The original BZ was <https://bugzilla.tianocore.org/show_bug.cgi?id=3812>.
>> 
>> I'm sure Microsoft uses it in production. Client code for this
>> infrastructure may be present in Project Mu (I didn't try to check), or
>> in proprietary repositories. Perhaps Michael (CC'd) can share some details.
>> 
>I can't speak to how it is being used everywhere but it is used in 
>production. Other vendors have been involved (at least at various points 
>in time).
>
>The ACPI 6.4 spec reserved the PRMT table signature. The ACPI 6.5 spec 
>defined the _SB._OSC bit for an OS to declare PRM compatibility and 
>define a PRM OpRegion identifier. Support has been in iasl since 20200528.
>
>The PRM spec is on uefi.org. I believe this was ultimately pushed there 
>by Intel.
>
>https://uefi.org/sites/default/files/resources/Platform%20Runtime%20Mechanism%20-%20with%20legal%20notice.pdf
>
>It was added to edk2 to provide code for specifications on uefi.org, 
>make it available to vendors that do not use Mu but use it, and 
>similarly, in response to interest from others.
>
>The Code in PrmPkg is infrastructure to support loading custom handlers 
>so it is not expected to receive a large amount of churn.
>
>> Laszlo
>> 
>> 
>> 
>> 
>> 
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