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   This program and the accompanying materials
  13   are licensed and made available under the terms and conditions of the BSD License
  14   which accompanies this distribution.  The full text of the license may be found at
  15   http://opensource.org/licenses/bsd-license.php
  16
  17   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  18   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  19
  20 **/
  21 #include <Library/BaseLib.h>
  22 #include <Library/BaseMemoryLib.h>
  23 #include <Library/DebugLib.h>
  24 //
  25 // Maximum support address used to check input buffer
  26 //
  27 extern EFI_PHYSICAL_ADDRESS  mMmMemLibInternalMaximumSupportAddress;
  28
  29 /**
  30   Calculate and save the maximum support address.
  31
  32 **/
  33 VOID
  34 MmMemLibInternalCalculateMaximumSupportAddress (
  35   VOID
  36   )
  37 {
  38   UINT8        PhysicalAddressBits;
  39
  40   PhysicalAddressBits = 36;
  41
  42   //
  43   // Save the maximum support address in one global variable
  44   //
  45   mMmMemLibInternalMaximumSupportAddress = (EFI_PHYSICAL_ADDRESS)(UINTN)(LShiftU64 (1, PhysicalAddressBits) - 1);
  46   DEBUG ((DEBUG_INFO, "mMmMemLibInternalMaximumSupportAddress = 0x%lx\n", mMmMemLibInternalMaximumSupportAddress));
  47 }
  48
  49