OvmfPkg/IntelTdx/PrePiHobListPointerLibTdx/PrePiHobListPointer.c

   1 /** @file
   2 *
   3 *  Copyright (c) 2021, Intel Corporation. All rights reserved.<BR>
   4 *  SPDX-License-Identifier: BSD-2-Clause-Patent
   5 *
   6 **/
   7
   8 #include <PiPei.h>
   9 #include <Library/PrePiHobListPointerLib.h>
  10 #include <Library/DebugLib.h>
  11 #include <Library/HobLib.h>
  12 #include <WorkArea.h>
  13
  14 /**
  15   Returns the pointer to the HOB list.
  16
  17   This function returns the pointer to first HOB in the list.
  18
  19   @return The pointer to the HOB list.
  20
  21 **/
  22 VOID *
  23 EFIAPI
  24 PrePeiGetHobList (
  25   VOID
  26   )
  27 {
  28   TDX_WORK_AREA  *TdxWorkArea;
  29
  30   TdxWorkArea = (TDX_WORK_AREA *)(UINTN)FixedPcdGet32 (PcdOvmfWorkAreaBase);
  31   ASSERT (TdxWorkArea != NULL);
  32   ASSERT (TdxWorkArea->SecTdxWorkArea.HobList != 0);
  33
  34   return (VOID *)(UINTN)TdxWorkArea->SecTdxWorkArea.HobList;
  35 }
  36
  37 /**
  38   Updates the pointer to the HOB list.
  39
  40   @param  HobList       Hob list pointer to store
  41
  42 **/
  43 EFI_STATUS
  44 EFIAPI
  45 PrePeiSetHobList (
  46   IN  VOID  *HobList
  47   )
  48 {
  49   TDX_WORK_AREA  *TdxWorkArea;
  50
  51   TdxWorkArea = (TDX_WORK_AREA *)(UINTN)FixedPcdGet32 (PcdOvmfWorkAreaBase);
  52   ASSERT (TdxWorkArea != NULL);
  53
  54   TdxWorkArea->SecTdxWorkArea.HobList = (UINTN)HobList;
  55
  56   return EFI_SUCCESS;
  57 }