[Task]: Create Scratchpad Space for PeiCore AdvancedLoggerLib and Drop PEI_CORE_INSTANCE Hack

Feature Overview

Currently, the PEI Core instance of AdvancedLoggerLib relies on hacking the PEI_CORE_INSTANCE to have a stack based pointer to the advanced logger buffer. This avoids a HOB lookup on every log message. The lib instance uses PeiMain.h to have the definition of the structure.

However, mu_basecore has been updated to include an edk2 change that added a private header to PeiMain.h (which is private but not enforced so by the build system), which breaks the builds. In response, a temporary workaround was added to force include this private header.

Solution Overview

The hack of using PEI_CORE_INSTANCE can be dropped entirely and a separate scratchpad space can be used to avoid the HOB lookup.

Alternatives Considered

No response

Urgency

Medium

Are you going to implement the feature request?

I will implement the feature

Do you need maintainer feedback?

No maintainer feedback needed

Anything else?

No response

Start by locating the PEI Core AdvancedLoggerLib instance and its use of PeiMain.h, PEI_CORE_INSTANCE, and the advanced logger buffer. Trace how the current stack-based pointer avoids repeated HOB lookup, then identify the scratchpad space and update the affected build workaround. Done means the PEI Core logger no longer depends on the PEI_CORE_INSTANCE hack or forced private-header inclusion and the relevant builds pass.