StandaloneMmPkg/Library/StandaloneMmMemLib/AArch64/StandaloneMmMemLibInternal.c

   1 /** @file
   2   Internal ARCH Specific file of MM memory check library.
   3
   4   MM memory check library implementation. This library consumes MM_ACCESS_PROTOCOL
   5   to get MMRAM information. In order to use this library instance, the platform should produce
   6   all MMRAM range via MM_ACCESS_PROTOCOL, including the range for firmware (like MM Core
   7   and MM driver) and/or specific dedicated hardware.
   8
   9   Copyright (c) 2015, Intel Corporation. All rights reserved.<BR>
  10   Copyright (c) 2016 - 2018, ARM Limited. All rights reserved.<BR>
  11
  12   SPDX-License-Identifier: BSD-2-Clause-Patent
  13
  14 **/
  15 #include <Library/BaseLib.h>
  16 #include <Library/BaseMemoryLib.h>
  17 #include <Library/DebugLib.h>
  18 //
  19 // Maximum support address used to check input buffer
  20 //
  21 extern EFI_PHYSICAL_ADDRESS  mMmMemLibInternalMaximumSupportAddress;
  22
  23 /**
  24   Calculate and save the maximum support address.
  25
  26 **/
  27 VOID
  28 MmMemLibInternalCalculateMaximumSupportAddress (
  29   VOID
  30   )
  31 {
  32   UINT8        PhysicalAddressBits;
  33
  34   PhysicalAddressBits = 36;
  35
  36   //
  37   // Save the maximum support address in one global variable
  38   //
  39   mMmMemLibInternalMaximumSupportAddress = (EFI_PHYSICAL_ADDRESS)(UINTN)(LShiftU64 (1, PhysicalAddressBits) - 1);
  40   DEBUG ((DEBUG_INFO, "mMmMemLibInternalMaximumSupportAddress = 0x%lx\n", mMmMemLibInternalMaximumSupportAddress));
  41 }
  42
  43