text: /** @file
  
    Parts of the SMM/MM implementation that are specific to traditional MM
  
  Copyright (c) 2011 - 2018, Intel Corporation. All rights reserved. <BR>
  Copyright (c) 2018, Linaro, Ltd. All rights reserved. <BR>
  SPDX-License-Identifier: BSD-2-Clause-Patent
  
  **/
  
  #include <Library/UefiBootServicesTableLib.h>
  #include <Library/SmmMemLib.h>
  #include "Variable.h"
  
  /**
    This function checks if the buffer is valid per processor architecture and
    does not overlap with SMRAM.
  
    @param Buffer The buffer start address to be checked.
    @param Length The buffer length to be checked.
  
    @retval TRUE  This buffer is valid per processor architecture and does not
                  overlap with SMRAM.
    @retval FALSE This buffer is not valid per processor architecture or overlaps
                  with SMRAM.
  **/
  BOOLEAN
  VariableSmmIsBufferOutsideSmmValid (
    IN EFI_PHYSICAL_ADDRESS  Buffer,
    IN UINT64                Length
    )
  {
    return SmmIsBufferOutsideSmmValid (Buffer, Length);
  }
  
  /**
    Notify the system that the SMM variable driver is ready.
  **/
  VOID
  VariableNotifySmmReady (
    VOID
    )
  {
    EFI_STATUS  Status;
    EFI_HANDLE  Handle;
  
    Handle = NULL;
    Status = gBS->InstallProtocolInterface (
                    &Handle,
                    &gEfiSmmVariableProtocolGuid,
                    EFI_NATIVE_INTERFACE,
                    NULL
                    );
    ASSERT_EFI_ERROR (Status);
  }
  
  /**
    Notify the system that the SMM variable write driver is ready.
  **/
  VOID
  VariableNotifySmmWriteReady (
    VOID
    )
  {
    EFI_STATUS  Status;
    EFI_HANDLE  Handle;
  
    Handle = NULL;
    Status = gBS->InstallProtocolInterface (
                    &Handle,
                    &gSmmVariableWriteGuid,
                    EFI_NATIVE_INTERFACE,
                    NULL
                    );
    ASSERT_EFI_ERROR (Status);
  }
  
  /**
    Variable service MM driver entry point
  
    @param[in] ImageHandle    A handle for the image that is initializing this
                              driver
    @param[in] SystemTable    A pointer to the EFI system table
  
    @retval EFI_SUCCESS       Variable service successfully initialized.
  **/
  EFI_STATUS
  EFIAPI
  VariableServiceInitialize (
    IN EFI_HANDLE        ImageHandle,
    IN EFI_SYSTEM_TABLE  *SystemTable
    )
  {
    return MmVariableServiceInitialize ();
  }
  
  /**
    Whether the TCG or TCG2 protocols are installed in the UEFI protocol database.
    This information is used by the MorLock code to infer whether an existing
    MOR variable is legitimate or not.
  
    @retval TRUE  Either the TCG or TCG2 protocol is installed in the UEFI
                  protocol database
    @retval FALSE Neither the TCG nor the TCG2 protocol is installed in the UEFI
                  protocol database
  **/
  BOOLEAN
  VariableHaveTcgProtocols (
    VOID
    )
  {
    EFI_STATUS  Status;
    VOID        *Interface;
  
    Status = gBS->LocateProtocol (
                    &gEfiTcg2ProtocolGuid,
                    NULL,                     // Registration
                    &Interface
                    );
    if (!EFI_ERROR (Status)) {
      return TRUE;
    }
  
    Status = gBS->LocateProtocol (
                    &gEfiTcgProtocolGuid,
                    NULL,                     // Registration
                    &Interface
                    );
    return !EFI_ERROR (Status);
  }
  