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   The constructor reads variable and sets HOB
  21
  22   @param  FileHandle   The handle of FFS header the loaded driver.
  23   @param  PeiServices  The pointer to the PEI services.
  24
  25   @retval EFI_SUCCESS  The constructor always returns EFI_SUCCESS.
  26
  27 **/
  28 EFI_STATUS
  29 EFIAPI
  30 PeiDebugPrintHobLibConstructor (
  31   IN EFI_PEI_FILE_HANDLE     FileHandle,
  32   IN CONST EFI_PEI_SERVICES  **PeiServices
  33   )
  34 {
  35   EFI_STATUS                       Status;
  36   EFI_PEI_READ_ONLY_VARIABLE2_PPI  *Variable;
  37   UINTN                            Size;
  38   UINT64                           GlobalErrorLevel;
  39   UINT32                           HobErrorLevel;
  40
  41   Status = PeiServicesLocatePpi (
  42              &gEfiPeiReadOnlyVariable2PpiGuid,
  43              0,
  44              NULL,
  45              (VOID **)&Variable
  46              );
  47   if (!EFI_ERROR (Status)) {
  48     Size   = sizeof (GlobalErrorLevel);
  49     Status = Variable->GetVariable (
  50                          Variable,
  51                          DEBUG_MASK_VARIABLE_NAME,
  52                          &gEfiGenericVariableGuid,
  53                          NULL,
  54                          &Size,
  55                          &GlobalErrorLevel
  56                          );
  57     if (!EFI_ERROR (Status)) {
  58       //
  59       // Build the GUID'ed HOB for DXE
  60       //
  61       HobErrorLevel = (UINT32)GlobalErrorLevel;
  62       BuildGuidDataHob (
  63         &gEfiGenericVariableGuid,
  64         &HobErrorLevel,
  65         sizeof (HobErrorLevel)
  66         );
  67     }
  68   }
  69
  70   return EFI_SUCCESS;
  71 }