Vlv2TbltDevicePkg/FspSupport/Library/SecFspPlatformSecLibVlv2/SecPlatformInformation.c

   1 /** @file
   2
   3   Copyright (c) 2014, Intel Corporation. All rights reserved.<BR>
   4   SPDX-License-Identifier: BSD-2-Clause-Patent
   5
   6 **/
   7
   8 #include <PiPei.h>
   9
  10 #include <Ppi/SecPlatformInformation.h>
  11 #include <Ppi/TopOfTemporaryRam.h>
  12
  13 #include <Library/BaseMemoryLib.h>
  14 #include <Library/DebugLib.h>
  15
  16 /**
  17   This interface conveys state information out of the Security (SEC) phase into PEI.
  18
  19   @param  PeiServices               Pointer to the PEI Services Table.
  20   @param  StructureSize             Pointer to the variable describing size of the input buffer.
  21   @param  PlatformInformationRecord Pointer to the EFI_SEC_PLATFORM_INFORMATION_RECORD.
  22
  23   @retval EFI_SUCCESS           The data was successfully returned.
  24   @retval EFI_BUFFER_TOO_SMALL  The buffer was too small.
  25
  26 **/
  27 EFI_STATUS
  28 EFIAPI
  29 SecPlatformInformation (
  30   IN CONST EFI_PEI_SERVICES                     **PeiServices,
  31   IN OUT   UINT64                               *StructureSize,
  32      OUT   EFI_SEC_PLATFORM_INFORMATION_RECORD  *PlatformInformationRecord
  33   )
  34 {
  35   UINT32      *Bist;
  36   UINT32      Size;
  37   UINT32      Count;
  38   UINT32      TopOfTemporaryRam;
  39   VOID        *TopOfTemporaryRamPpi;
  40   EFI_STATUS  Status;
  41
  42   DEBUG ((DEBUG_INFO, "SecPlatformInformation\n"));
  43
  44   Status = (*PeiServices)->LocatePpi (
  45                              PeiServices,
  46                              &gTopOfTemporaryRamPpiGuid,
  47                              0,
  48                              NULL,
  49                              (VOID **) &TopOfTemporaryRamPpi
  50                              );
  51   if (EFI_ERROR (Status)) {
  52     return EFI_NOT_FOUND;
  53   }
  54
  55   //
  56   // The entries of BIST information, together with the number of them,
  57   // reside in the bottom of stack, left untouched by normal stack operation.
  58   // This routine copies the BIST information to the buffer pointed by
  59   // PlatformInformationRecord for output.
  60   //
  61   TopOfTemporaryRam = (UINT32)(UINTN)TopOfTemporaryRamPpi - sizeof (UINT32);
  62   TopOfTemporaryRam -= sizeof(UINT32) * 2;
  63   Count             = *((UINT32 *)(UINTN) (TopOfTemporaryRam - sizeof (UINT32)));
  64   Size              = Count * sizeof (IA32_HANDOFF_STATUS);
  65
  66   if ((*StructureSize) < (UINT64) Size) {
  67     *StructureSize = Size;
  68     return EFI_BUFFER_TOO_SMALL;
  69   }
  70
  71   *StructureSize  = Size;
  72   Bist            = (UINT32 *) (TopOfTemporaryRam - sizeof (UINT32) - Size);
  73
  74   CopyMem (PlatformInformationRecord, Bist, Size);
  75
  76   return EFI_SUCCESS;
  77 }