ArmPkg/Library/ArmMmuLib/AArch64/ArmMmuPeiLibConstructor.c

   1 #/* @file
   2 #
   3 #  Copyright (c) 2016, Linaro Limited. All rights reserved.
   4 #
   5 #  This program and the accompanying materials
   6 #  are licensed and made available under the terms and conditions of the BSD License
   7 #  which accompanies this distribution.  The full text of the license may be found at
   8 #  http://opensource.org/licenses/bsd-license.php
   9 #
  10 #  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  11 #  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  12 #
  13 #*/
  14
  15 #include <Base.h>
  16
  17 #include <Library/ArmLib.h>
  18 #include <Library/ArmMmuLib.h>
  19 #include <Library/CacheMaintenanceLib.h>
  20 #include <Library/DebugLib.h>
  21
  22 EFI_STATUS
  23 EFIAPI
  24 ArmMmuPeiLibConstructor (
  25   IN       EFI_PEI_FILE_HANDLE       FileHandle,
  26   IN CONST EFI_PEI_SERVICES          **PeiServices
  27   )
  28 {
  29   extern UINT32             ArmReplaceLiveTranslationEntrySize;
  30
  31   EFI_FV_FILE_INFO          FileInfo;
  32   EFI_STATUS                Status;
  33
  34   ASSERT (FileHandle != NULL);
  35
  36   Status = (*PeiServices)->FfsGetFileInfo (FileHandle, &FileInfo);
  37   ASSERT_EFI_ERROR (Status);
  38
  39   //
  40   // Some platforms do not cope very well with cache maintenance being
  41   // performed on regions backed by NOR flash. Since the firmware image
  42   // can be assumed to be clean to the PoC when running XIP, even when PEI
  43   // is executing from DRAM, we only need to perform the cache maintenance
  44   // when not executing in place.
  45   //
  46   if ((UINTN)FileInfo.Buffer <= (UINTN)ArmReplaceLiveTranslationEntry &&
  47       ((UINTN)FileInfo.Buffer + FileInfo.BufferSize >=
  48        (UINTN)ArmReplaceLiveTranslationEntry + ArmReplaceLiveTranslationEntrySize)) {
  49     DEBUG ((EFI_D_INFO, "ArmMmuLib: skipping cache maintenance on XIP PEIM\n"));
  50   } else {
  51     DEBUG ((EFI_D_INFO, "ArmMmuLib: performing cache maintenance on shadowed PEIM\n"));
  52     //
  53     // The ArmReplaceLiveTranslationEntry () helper function may be invoked
  54     // with the MMU off so we have to ensure that it gets cleaned to the PoC
  55     //
  56     WriteBackDataCacheRange (ArmReplaceLiveTranslationEntry,
  57       ArmReplaceLiveTranslationEntrySize);
  58   }
  59
  60   return RETURN_SUCCESS;
  61 }