DXE SMM Ready To Lock protocol introduced in the PI 1.2 specification.
According to PI 1.4a specification, this UEFI protocol indicates that resources and services that should not be used by the third party code are about to be locked. This protocol is a mandatory protocol published by PI platform code. This protocol in tandem with the End of DXE Event facilitates transition of the platform from the environment where all of the components are under the authority of the platform manufacturer to the environment where third party extensible modules such as UEFI drivers and UEFI applications are executed. The protocol is published immediately after signaling of the End of DXE Event. PI modules that need to lock or protect their resources in anticipation of the invocation of 3rd party extensible modules should register for notification on installation of this protocol and effect the appropriate protections in their notification handlers. For example, PI platform code may choose to use notification handler to lock SMM by invoking EFI_SMM_ACCESS2_PROTOCOL.Lock() function.
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