MdePkg/Include/Protocol/SmmAccess2.h

   1 /** @file
   2   EFI SMM Access2 Protocol as defined in the PI 1.2 specification.
   3
   4   This protocol is used to control the visibility of the SMRAM on the platform.
   5   It abstracts the location and characteristics of SMRAM.  The expectation is
   6   that the north bridge or memory controller would publish this protocol.
   7
   8   The principal functionality found in the memory controller includes the following:
   9   - Exposing the SMRAM to all non-SMM agents, or the "open" state
  10   - Shrouding the SMRAM to all but the SMM agents, or the "closed" state
  11   - Preserving the system integrity, or "locking" the SMRAM, such that the settings cannot be
  12     perturbed by either boot service or runtime agents
  13
  14   Copyright (c) 2009 - 2018, Intel Corporation. All rights reserved.<BR>
  15   SPDX-License-Identifier: BSD-2-Clause-Patent
  16
  17 **/
  18
  19 #ifndef _SMM_ACCESS2_H_
  20 #define _SMM_ACCESS2_H_
  21
  22 #include <Protocol/MmAccess.h>
  23
  24 #define EFI_SMM_ACCESS2_PROTOCOL_GUID       EFI_MM_ACCESS_PROTOCOL_GUID
  25
  26 typedef EFI_MM_ACCESS_PROTOCOL  EFI_SMM_ACCESS2_PROTOCOL;
  27
  28 typedef EFI_MM_OPEN EFI_SMM_OPEN2;
  29
  30 typedef EFI_MM_CLOSE EFI_SMM_CLOSE2;
  31
  32 typedef EFI_MM_LOCK EFI_SMM_LOCK2;
  33
  34 typedef EFI_MM_CAPABILITIES EFI_SMM_CAPABILITIES2;
  35 extern EFI_GUID gEfiSmmAccess2ProtocolGuid;
  36
  37 #endif
  38