IntelFspWrapperPkg/Library/SecPeiFspPlatformSecLibSample/SaveSecContext.c

   1 /** @file
   2   Sample to provide SaveSecContext function.
   3
   4   Copyright (c) 2014, Intel Corporation. All rights reserved.<BR>
   5   SPDX-License-Identifier: BSD-2-Clause-Patent
   6
   7 **/
   8
   9
  10 #include <PiPei.h>
  11 #include <Library/DebugLib.h>
  12
  13 #include <Ppi/TopOfTemporaryRam.h>
  14 #include <Ppi/SecPlatformInformation.h>
  15
  16 /**
  17   Save BIST value before call FspInit.
  18
  19   @param[in] Bist   BIST value.
  20 **/
  21 VOID
  22 AsmSaveBistValue (
  23   IN UINT32  Bist
  24   );
  25
  26 /**
  27   Save Ticker value before call FspInit.
  28
  29   @param[in] Ticker   Ticker value.
  30 **/
  31 VOID
  32 AsmSaveTickerValue (
  33   IN UINT64  Ticker
  34   );
  35
  36 /**
  37   Save SEC context before call FspInit.
  38
  39   @param[in] PeiServices  Pointer to PEI Services Table.
  40 **/
  41 VOID
  42 EFIAPI
  43 SaveSecContext (
  44   IN CONST EFI_PEI_SERVICES                     **PeiServices
  45   )
  46 {
  47   UINT32      *Bist;
  48   UINT64      *Ticker;
  49   UINT32      Size;
  50   UINT32      Count;
  51   UINT32      TopOfTemporaryRam;
  52   VOID        *TopOfTemporaryRamPpi;
  53   EFI_STATUS  Status;
  54
  55   DEBUG ((DEBUG_INFO, "SaveSecContext - 0x%x\n", PeiServices));
  56
  57   Status = (*PeiServices)->LocatePpi (
  58                              PeiServices,
  59                              &gTopOfTemporaryRamPpiGuid,
  60                              0,
  61                              NULL,
  62                              (VOID **) &TopOfTemporaryRamPpi
  63                              );
  64   if (EFI_ERROR (Status)) {
  65     return ;
  66   }
  67
  68   DEBUG ((DEBUG_INFO, "TopOfTemporaryRamPpi - 0x%x\n", TopOfTemporaryRamPpi));
  69
  70   //
  71   // The entries of BIST information, together with the number of them,
  72   // reside in the bottom of stack, left untouched by normal stack operation.
  73   // This routine copies the BIST information to the buffer pointed by
  74   // PlatformInformationRecord for output.
  75   //
  76   // |--------------| <- TopOfTemporaryRam
  77   // |Number of BSPs|
  78   // |--------------|
  79   // |     BIST     |
  80   // |--------------|
  81   // |     ....     |
  82   // |--------------|
  83   // |  TSC[63:32]  |
  84   // |--------------|
  85   // |  TSC[31:00]  |
  86   // |--------------|
  87   //
  88
  89   TopOfTemporaryRam = (UINT32)(UINTN)TopOfTemporaryRamPpi - sizeof(UINT32);
  90   TopOfTemporaryRam -= sizeof(UINT32) * 2;
  91   DEBUG ((DEBUG_INFO, "TopOfTemporaryRam - 0x%x\n", TopOfTemporaryRam));
  92   Count             = *(UINT32 *)(UINTN)(TopOfTemporaryRam - sizeof(UINT32));
  93   DEBUG ((DEBUG_INFO, "Count - 0x%x\n", Count));
  94   Size              = Count * sizeof (IA32_HANDOFF_STATUS);
  95   DEBUG ((DEBUG_INFO, "Size - 0x%x\n", Size));
  96
  97   Bist   = (UINT32 *)(UINTN)(TopOfTemporaryRam - sizeof(UINT32) - Size);
  98   DEBUG ((DEBUG_INFO, "Bist - 0x%x\n", *Bist));
  99   Ticker = (UINT64 *)(UINTN)(TopOfTemporaryRam - sizeof(UINT32) - Size - sizeof(UINT64));
 100   DEBUG ((DEBUG_INFO, "Ticker - 0x%lx\n", *Ticker));
 101
 102   // Just need record BSP
 103   AsmSaveBistValue (*Bist);
 104   AsmSaveTickerValue (*Ticker);
 105 }