MdeModulePkg/Library/PeiDebugPrintHobLib/PeiDebugPrintHobLib.c

   1 /** @file
   2   NULL Library class that reads Debug Mask variable and if it exists makes a
   3   HOB that contains the debug mask.
   4
   5   Copyright (c) 2011, Apple, Inc. All rights reserved.<BR>
   6   SPDX-License-Identifier: BSD-2-Clause-Patent
   7
   8 **/
   9
  10 #include <PiPei.h>
  11
  12 #include <Library/HobLib.h>
  13 #include <Library/DebugLib.h>
  14 #include <Library/PeiServicesLib.h>
  15
  16 #include <Ppi/ReadOnlyVariable2.h>
  17 #include <Guid/DebugMask.h>
  18
  19
  20 /**
  21   The constructor reads variable and sets HOB
  22
  23   @param  FileHandle   The handle of FFS header the loaded driver.
  24   @param  PeiServices  The pointer to the PEI services.
  25
  26   @retval EFI_SUCCESS  The constructor always returns EFI_SUCCESS.
  27
  28 **/
  29 EFI_STATUS
  30 EFIAPI
  31 PeiDebugPrintHobLibConstructor (
  32   IN EFI_PEI_FILE_HANDLE        FileHandle,
  33   IN CONST EFI_PEI_SERVICES     **PeiServices
  34   )
  35 {
  36   EFI_STATUS                      Status;
  37   EFI_PEI_READ_ONLY_VARIABLE2_PPI *Variable;
  38   UINTN                           Size;
  39   UINT64                          GlobalErrorLevel;
  40   UINT32                          HobErrorLevel;
  41
  42   Status = PeiServicesLocatePpi (
  43              &gEfiPeiReadOnlyVariable2PpiGuid,
  44              0,
  45              NULL,
  46              (VOID **)&Variable
  47              );
  48   if (!EFI_ERROR (Status)) {
  49     Size = sizeof (GlobalErrorLevel);
  50     Status = Variable->GetVariable (
  51                          Variable,
  52                          DEBUG_MASK_VARIABLE_NAME,
  53                          &gEfiGenericVariableGuid,
  54                          NULL,
  55                          &Size,
  56                          &GlobalErrorLevel
  57                          );
  58     if (!EFI_ERROR (Status)) {
  59       //
  60       // Build the GUID'ed HOB for DXE
  61       //
  62       HobErrorLevel = (UINT32)GlobalErrorLevel;
  63       BuildGuidDataHob (
  64         &gEfiGenericVariableGuid,
  65         &HobErrorLevel,
  66         sizeof (HobErrorLevel)
  67         );
  68     }
  69   }
  70
  71   return EFI_SUCCESS;
  72 }