ArmVirtPkg/Library/ArmCcaLibNull/ArmCcaLibNull.c

/** @file
  Null implemmentation of the ArmCcaLib library.

  Copyright (c) 2022 - 2023, Arm Limited. All rights reserved.<BR>
  SPDX-License-Identifier: BSD-2-Clause-Patent

  @par Glossary:
    - Rsi or RSI   - Realm Service Interface
    - IPA          - Intermediate Physical Address
    - RIPAS        - Realm IPA state
**/
#include <Base.h>

/**
  Check if running in a Realm.

    @retval TRUE    The execution is within the context of a Realm.
    @retval FALSE   The execution is not within the context of a Realm.
**/
BOOLEAN
EFIAPI
ArmCcaIsRealm (
  VOID
  )
{
  return FALSE;
}

/**
  Return the IPA width of the Realm.

  The IPA width of the Realm is used to configure the protection attribute
  for memory regions, see ArmCcaSetMemoryProtectionAttribute().

    @param [out] IpaWidth  IPA width of the Realm.

    @retval RETURN_SUCCESS            Success.
    @retval RETURN_INVALID_PARAMETER  A parameter is invalid.
    @retval RETURN_UNSUPPORTED        The execution is not within the
                                      context of a Realm.
**/
RETURN_STATUS
EFIAPI
ArmCcaGetIpaWidth (
  OUT UINT64  *IpaWidth
  )
{
  return RETURN_UNSUPPORTED;
}

/** Check if the address range is protected MMIO

  @param [in]   BaseAddress      Base address of the device MMIO region.
  @param [in]   Length           Length of the device MMIO region.
  @param [out]  IsProtectedMmio  TRUE - if the RIPAS for the address range is
                                        protected MMIO.
                                 FALSE - if the RIPAS for the address range is
                                         not protected MMIO.

  @retval RETURN_SUCCESS            Success.
  @retval RETURN_INVALID_PARAMETER  A parameter is invalid.
  @retval RETURN_UNSUPPORTED        The request is not initiated in a
                                    Realm.
**/
RETURN_STATUS
EFIAPI
ArmCcaMemRangeIsProtectedMmio (
  IN  UINT64   BaseAddress,
  IN  UINT64   Length,
  OUT BOOLEAN  *IsProtectedMmio
  )
{
  return RETURN_UNSUPPORTED;
}