Support the platform specific event hooks which can be customized.

[Eathonhsu]

Description

The current event triggers lack flexibility and cannot be effectively used on some platforms.

1. Create hook functions at the end of dxe event before and after the event.
2. Create a hook after the boot manager dispatch the deferred 3rd party images Event.

• Impacts functionality?
  • Functionality - Does the change ultimately impact how firmware functions?
  • Examples: Add a new library, publish a new PPI, update an algorithm, ...
• Impacts security?
  • Security - Does the change have a direct security impact on an application,
    flow, or firmware?
  • Examples: Crypto algorithm change, buffer overflow fix, parameter
    validation improvement, ...
• Breaking change?
  • Breaking change - Will anyone consuming this change experience a break
    in build or boot behavior?
  • Examples: Add a new library class, move a module to a different repo, call
    a function in a new library class in a pre-existing module, ...
• Includes tests?
  • Tests - Does the change include any explicit test code?
  • Examples: Unit tests, integration tests, robot tests, ...
• Includes documentation?
  • Documentation - Does the change contain explicit documentation additions
    outside direct code modifications (and comments)?
  • Examples: Update readme file, add feature readme file, link to documentation
    on an a separate Web page, ...

How This Was Tested

It will not affect the original process, mainly serving as an extension for platform use.

Integration Instructions

Create a new library to be replaced by the platform to expand functionality.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 17 lines in your changes are missing coverage. Please review.

Project coverage is 12.00%. Comparing base (cd7ce3e) to head (2cf4944).

Files	Patch %	Lines
.../BdsPlatformEventLibNull/BdsPlatformEventLibNull.c	0.00%	13 Missing ⚠️
...rePkg/Library/PlatformBootManagerLib/BdsPlatform.c	0.00%	4 Missing ⚠️

Additional details and impacted files

@@                Coverage Diff                 @@
##           release/202311     #469      +/-   ##
==================================================
- Coverage           12.01%   12.00%   -0.02%     
==================================================
  Files                 110      111       +1     
  Lines               19003    19019      +16     
  Branches             1735     1735              
==================================================
  Hits                 2283     2283              
- Misses              16674    16690      +16     
  Partials               46       46              

Flag	Coverage Δ
MfciPkg	38.51% <ø> (ø)
MsCorePkg	1.42% <0.00%> (-0.01%)	⬇️

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[apop5]

@Eathonhsu can you please fill out the Description details?

[kuqin12]

Since this is in MU_PLUS, we should not need to use MS_CHANGE tags in this PR.

[kuqin12]

What are the usage of these hooks?

Also, is the abstraction method better than the event signaling? i.e. line 49?

@apop5 @spbrogan thoughts?

[Eathonhsu]

In practical cases, we would use these hooks to send platform-specific events to enable the functionality to be activated properly.

Why I choose to use a library instead of send EventGroupSignal, the reason is that after the platform receives the event callback, the callback function will send its platform-specific events. I'm concerned about potential nesting of muti-events.

[Eathonhsu]

@Eathonhsu can you please fill out the Description details?

Updated, thanks for the suggestion

[apop5]

@Eathonhsu can you please fill out the Description details?

Updated, thanks for the suggestion

I added the "breaking change" because this would require existing platforms to include a new library instance in their project to allow this to build.