StandaloneMmPkg/Library/StandaloneMmMemLib/ArmStandaloneMmMemLibInternal.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 #ifdef MDE_CPU_AARCH64
  24 #define ARM_PHYSICAL_ADDRESS_BITS 36
  25 #endif
  26 #ifdef MDE_CPU_ARM
  27 #define ARM_PHYSICAL_ADDRESS_BITS 32
  28 #endif
  29
  30 /**
  31   Calculate and save the maximum support address.
  32
  33 **/
  34 VOID
  35 MmMemLibInternalCalculateMaximumSupportAddress (
  36   VOID
  37   )
  38 {
  39   UINT8        PhysicalAddressBits;
  40
  41   PhysicalAddressBits = ARM_PHYSICAL_ADDRESS_BITS;
  42
  43   //
  44   // Save the maximum support address in one global variable
  45   //
  46   mMmMemLibInternalMaximumSupportAddress = (EFI_PHYSICAL_ADDRESS)(UINTN)(LShiftU64 (1, PhysicalAddressBits) - 1);
  47   DEBUG ((DEBUG_INFO, "mMmMemLibInternalMaximumSupportAddress = 0x%lx\n", mMmMemLibInternalMaximumSupportAddress));
  48 }
  49
  50 /**
  51   Initialize cached Mmram Ranges from HOB.
  52
  53   @retval EFI_UNSUPPORTED   The routine is unable to extract MMRAM information.
  54   @retval EFI_SUCCESS       MmRanges are populated successfully.
  55
  56 **/
  57 EFI_STATUS
  58 MmMemLibInternalPopulateMmramRanges (
  59   VOID
  60   )
  61 {
  62   // Not implemented for AARCH64.
  63   return EFI_SUCCESS;
  64 }
  65
  66 /**
  67   Deinitialize cached Mmram Ranges.
  68
  69 **/
  70 VOID
  71 MmMemLibInternalFreeMmramRanges (
  72   VOID
  73   )
  74 {
  75   // Not implemented for AARCH64.
  76 }
  77