MdeModulePkg/Universal/Variable/RuntimeDxe/PrivilegePolymorphic.h

/** @file
  Polymorphic functions that are called from both the privileged driver (i.e.,
  the DXE_SMM variable module) and the non-privileged drivers (i.e., one or
  both of the DXE_RUNTIME variable modules).

  Each of these functions has two implementations, appropriate for privileged
  vs. non-privileged driver code.

  Copyright (c) 2017, Red Hat, Inc.<BR>
  Copyright (c) 2010 - 2024, Intel Corporation. All rights reserved.<BR>

  SPDX-License-Identifier: BSD-2-Clause-Patent
**/

#ifndef _PRIVILEGE_POLYMORPHIC_H_
#define _PRIVILEGE_POLYMORPHIC_H_

#include <Uefi/UefiBaseType.h>

/**
  SecureBoot Hook for auth variable update.

  @param[in] VariableName                 Name of Variable to be found.
  @param[in] VendorGuid                   Variable vendor GUID.
**/
VOID
EFIAPI
SecureBootHook (
  IN CHAR16    *VariableName,
  IN EFI_GUID  *VendorGuid
  );

/**
  Initialization for MOR Control Lock.

  @retval EFI_SUCCESS     MorLock initialization success.
  @return Others          Some error occurs.
**/
EFI_STATUS
MorLockInit (
  VOID
  );

/**
  Delayed initialization for MOR Control Lock at EndOfDxe.

  This function performs any operations queued by MorLockInit().
**/
VOID
MorLockInitAtEndOfDxe (
  VOID
  );

/**
  This service is an MOR/MorLock checker handler for the SetVariable().

  @param[in]  VariableName the name of the vendor's variable, as a
                           Null-Terminated Unicode String
  @param[in]  VendorGuid   Unify identifier for vendor.
  @param[in]  Attributes   Attributes bitmask to set for the variable.
  @param[in]  DataSize     The size in bytes of Data-Buffer.
  @param[in]  Data         Point to the content of the variable.

  @retval  EFI_SUCCESS            The MOR/MorLock check pass, and Variable
                                  driver can store the variable data.
  @retval  EFI_INVALID_PARAMETER  The MOR/MorLock data or data size or
                                  attributes is not allowed for MOR variable.
  @retval  EFI_ACCESS_DENIED      The MOR/MorLock is locked.
  @retval  EFI_ALREADY_STARTED    The MorLock variable is handled inside this
                                  function. Variable driver can just return
                                  EFI_SUCCESS.
**/
EFI_STATUS
SetVariableCheckHandlerMor (
  IN CHAR16    *VariableName,
  IN EFI_GUID  *VendorGuid,
  IN UINT32    Attributes,
  IN UINTN     DataSize,
  IN VOID      *Data
  );

/**
  This service is consumed by the variable modules to place a barrier to stop
  speculative execution.

  Ensures that no later instruction will execute speculatively, until all prior
  instructions have completed.

**/
VOID
VariableSpeculationBarrier (
  VOID
  );

/**
  Notify the system that the SMM variable driver is ready.
**/
VOID
VariableNotifySmmReady (
  VOID
  );

/**
  Notify the system that the SMM variable write driver is ready.
**/
VOID
VariableNotifySmmWriteReady (
  VOID
  );

/**
  Variable Driver main entry point. The Variable driver places the 4 EFI
  runtime services in the EFI System Table and installs arch protocols
  for variable read and write services being available. It also registers
  a notification function for an EVT_SIGNAL_VIRTUAL_ADDRESS_CHANGE event.

  @retval EFI_SUCCESS       Variable service successfully initialized.
**/
EFI_STATUS
EFIAPI
MmVariableServiceInitialize (
  VOID
  );

/**
  This function checks if the Primary Buffer (CommBuffer) is valid.

  @param Buffer The buffer start address to be checked.
  @param Length The buffer length to be checked.

  @retval TRUE  This buffer is valid.
  @retval FALSE This buffer is not valid.
**/
BOOLEAN
VariableSmmIsPrimaryBufferValid (
  IN EFI_PHYSICAL_ADDRESS  Buffer,
  IN UINT64                Length
  );

/**
  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
VariableSmmIsNonPrimaryBufferValid (
  IN EFI_PHYSICAL_ADDRESS  Buffer,
  IN UINT64                Length
  );

/**
  Whether the MOR variable is legitimate or not.

  @retval TRUE  MOR Variable is legitimate.
  @retval FALSE MOR Variable in not legitimate.
**/
BOOLEAN
VariableIsMorVariableLegitimate (
  VOID
  );

#endif