MdeModulePkg/Universal/Variable/RuntimeDxe/VariableStandaloneMm.c

   1 /** @file
   2
   3   Parts of the SMM/MM implementation that are specific to standalone MM
   4
   5 Copyright (c) 2011 - 2018, Intel Corporation. All rights reserved. <BR>
   6 Copyright (c) 2018, Linaro, Ltd. All rights reserved. <BR>
   7 SPDX-License-Identifier: BSD-2-Clause-Patent
   8
   9 **/
  10
  11 #include "Variable.h"
  12
  13 /**
  14   This function checks if the buffer is valid per processor architecture and
  15   does not overlap with SMRAM.
  16
  17   @param Buffer The buffer start address to be checked.
  18   @param Length The buffer length to be checked.
  19
  20   @retval TRUE  This buffer is valid per processor architecture and does not
  21                 overlap with SMRAM.
  22   @retval FALSE This buffer is not valid per processor architecture or overlaps
  23                 with SMRAM.
  24 **/
  25 BOOLEAN
  26 VariableSmmIsBufferOutsideSmmValid (
  27   IN EFI_PHYSICAL_ADDRESS  Buffer,
  28   IN UINT64                Length
  29   )
  30 {
  31   return TRUE;
  32 }
  33
  34 /**
  35   Notify the system that the SMM variable driver is ready.
  36 **/
  37 VOID
  38 VariableNotifySmmReady (
  39   VOID
  40   )
  41 {
  42 }
  43
  44 /**
  45   Notify the system that the SMM variable write driver is ready.
  46 **/
  47 VOID
  48 VariableNotifySmmWriteReady (
  49   VOID
  50   )
  51 {
  52 }
  53
  54 /**
  55   Variable service MM driver entry point.
  56
  57   @param[in] ImageHandle    A handle for the image that is initializing this
  58                             driver
  59   @param[in] MmSystemTable  A pointer to the MM system table
  60
  61   @retval EFI_SUCCESS       Variable service successfully initialized.
  62 **/
  63 EFI_STATUS
  64 EFIAPI
  65 VariableServiceInitialize (
  66   IN EFI_HANDLE                           ImageHandle,
  67   IN EFI_MM_SYSTEM_TABLE                  *MmSystemTable
  68   )
  69 {
  70   return MmVariableServiceInitialize ();
  71 }
  72
  73 /**
  74   Whether the TCG or TCG2 protocols are installed in the UEFI protocol database.
  75   This information is used by the MorLock code to infer whether an existing
  76   MOR variable is legitimate or not.
  77
  78   @retval TRUE  Either the TCG or TCG2 protocol is installed in the UEFI
  79                 protocol database
  80   @retval FALSE Neither the TCG nor the TCG2 protocol is installed in the UEFI
  81                 protocol database
  82 **/
  83 BOOLEAN
  84 VariableHaveTcgProtocols (
  85   VOID
  86   )
  87 {
  88   return FALSE;
  89 }