EFI SMM Access2 Protocol as defined in the PI 1.2 specification.
This protocol is used to control the visibility of the SMRAM on the platform. It abstracts the location and characteristics of SMRAM. The expectation is that the north bridge or memory controller would publish this protocol.
The principal functionality found in the memory controller includes the following:
- Exposing the SMRAM to all non-SMM agents, or the "open" state
- Shrouding the SMRAM to all but the SMM agents, or the "closed" state
- Preserving the system integrity, or "locking" the SMRAM, such that the settings cannot be perturbed by either boot service or runtime agents
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SPDX-License-Identifier: BSD-2-Clause-Patent
1.8.6 
