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   This program and the accompanying materials
   7   are licensed and made available under the terms and conditions of the BSD License
   8   which accompanies this distribution.  The full text of the license may be found at
   9   http://opensource.org/licenses/bsd-license.php
  10
  11   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  12   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  13
  14 **/
  15
  16 #include <PiPei.h>
  17
  18 #include <Library/HobLib.h>
  19 #include <Library/DebugLib.h>
  20 #include <Library/PeiServicesLib.h>
  21
  22 #include <Ppi/ReadOnlyVariable2.h>
  23 #include <Guid/DebugMask.h>
  24
  25
  26 /**
  27   The constructor reads variable and sets HOB
  28
  29   @param  FileHandle   The handle of FFS header the loaded driver.
  30   @param  PeiServices  The pointer to the PEI services.
  31
  32   @retval EFI_SUCCESS  The constructor always returns EFI_SUCCESS.
  33
  34 **/
  35 EFI_STATUS
  36 EFIAPI
  37 PeiDebugPrintHobLibConstructor (
  38   IN EFI_PEI_FILE_HANDLE        FileHandle,
  39   IN CONST EFI_PEI_SERVICES     **PeiServices
  40   )
  41 {
  42   EFI_STATUS                      Status;
  43   EFI_PEI_READ_ONLY_VARIABLE2_PPI *Variable;
  44   UINTN                           Size;
  45   UINT64                          GlobalErrorLevel;
  46   UINT32                          HobErrorLevel;
  47
  48   Status = PeiServicesLocatePpi (
  49              &gEfiPeiReadOnlyVariable2PpiGuid,
  50              0,
  51              NULL,
  52              (VOID **)&Variable
  53              );
  54   if (!EFI_ERROR (Status)) {
  55     Size = sizeof (GlobalErrorLevel);
  56     Status = Variable->GetVariable (
  57                          Variable,
  58                          DEBUG_MASK_VARIABLE_NAME,
  59                          &gEfiGenericVariableGuid,
  60                          NULL,
  61                          &Size,
  62                          &GlobalErrorLevel
  63                          );
  64     if (!EFI_ERROR (Status)) {
  65       //
  66       // Build the GUID'ed HOB for DXE
  67       //
  68       HobErrorLevel = (UINT32)GlobalErrorLevel;
  69       BuildGuidDataHob (
  70         &gEfiGenericVariableGuid,
  71         &HobErrorLevel,
  72         sizeof (HobErrorLevel)
  73         );
  74     }
  75   }
  76
  77   return EFI_SUCCESS;
  78 }