Vlv2TbltDevicePkg/FspSupport/Library/SecFspPlatformSecLibVlv2/SaveSecContext.c

   1 /** @file
   2   This PEIM will parse the hoblist from fsp and report them into pei core.
   3   This file contains the main entrypoint of the PEIM.
   4
   5   Copyright (c) 2014, Intel Corporation. All rights reserved.<BR>
   6   SPDX-License-Identifier: BSD-2-Clause-Patent
   7
   8 **/
   9
  10
  11 #include <PiPei.h>
  12 #include <Library/DebugLib.h>
  13
  14 #include <Ppi/TopOfTemporaryRam.h>
  15 #include <Ppi/SecPlatformInformation.h>
  16
  17 /**
  18   Save BIST value before call FspInit.
  19
  20   @param Bist   BIST value.
  21 **/
  22 VOID
  23 AsmSaveBistValue (
  24   IN UINT32  Bist
  25   );
  26
  27 /**
  28   Save Ticker value before call FspInit.
  29
  30   @param Ticker   Ticker value.
  31 **/
  32 VOID
  33 AsmSaveTickerValue (
  34   IN UINT64  Ticker
  35   );
  36
  37 /**
  38   Save SEC context before call FspInit.
  39
  40   @param PeiServices  Pointer to PEI Services Table.
  41 **/
  42 VOID
  43 EFIAPI
  44 SaveSecContext (
  45   IN CONST EFI_PEI_SERVICES                     **PeiServices
  46   )
  47 {
  48   UINT32      *Bist;
  49   UINT64      *Ticker;
  50   UINT32      Size;
  51   UINT32      Count;
  52   UINT32      TopOfTemporaryRam;
  53   VOID        *TopOfTemporaryRamPpi;
  54   EFI_STATUS  Status;
  55
  56   DEBUG ((DEBUG_INFO, "SaveSecContext - 0x%x\n", PeiServices));
  57
  58   Status = (*PeiServices)->LocatePpi (
  59                              PeiServices,
  60                              &gTopOfTemporaryRamPpiGuid,
  61                              0,
  62                              NULL,
  63                              (VOID **) &TopOfTemporaryRamPpi
  64                              );
  65   if (EFI_ERROR (Status)) {
  66     return ;
  67   }
  68
  69   DEBUG ((DEBUG_INFO, "TopOfTemporaryRamPpi - 0x%x\n", TopOfTemporaryRamPpi));
  70
  71   //
  72   // The entries of BIST information, together with the number of them,
  73   // reside in the bottom of stack, left untouched by normal stack operation.
  74   // This routine copies the BIST information to the buffer pointed by
  75   // PlatformInformationRecord for output.
  76   //
  77   // |--------------| <- TopOfTemporaryRam
  78   // |Number of BSPs|
  79   // |--------------|
  80   // |     BIST     |
  81   // |--------------|
  82   // |     ....     |
  83   // |--------------|
  84   // |  TSC[63:32]  |
  85   // |--------------|
  86   // |  TSC[31:00]  |
  87   // |--------------|
  88   //
  89
  90   TopOfTemporaryRam = (UINT32)(UINTN)TopOfTemporaryRamPpi - sizeof(UINT32);
  91   TopOfTemporaryRam -= sizeof(UINT32) * 2;
  92   DEBUG ((DEBUG_INFO, "TopOfTemporaryRam - 0x%x\n", TopOfTemporaryRam));
  93   Count             = *(UINT32 *)(UINTN)(TopOfTemporaryRam - sizeof(UINT32));
  94   DEBUG ((DEBUG_INFO, "Count - 0x%x\n", Count));
  95   Size              = Count * sizeof (IA32_HANDOFF_STATUS);
  96   DEBUG ((DEBUG_INFO, "Size - 0x%x\n", Size));
  97
  98   Bist   = (UINT32 *)(UINTN)(TopOfTemporaryRam - sizeof(UINT32) - Size);
  99   DEBUG ((DEBUG_INFO, "Bist - 0x%x\n", *Bist));
 100   Ticker = (UINT64 *)(UINTN)(TopOfTemporaryRam - sizeof(UINT32) - Size - sizeof(UINT64));
 101   DEBUG ((DEBUG_INFO, "Ticker - 0x%lx\n", *Ticker));
 102
 103   //
 104   // Just need record BSP
 105   //
 106   AsmSaveBistValue (*Bist);
 107   AsmSaveTickerValue (*Ticker);
 108 }