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   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
  17 #include <PiPei.h>
  18 #include <Library/DebugLib.h>
  19
  20 #include <Ppi/TopOfTemporaryRam.h>
  21 #include <Ppi/SecPlatformInformation.h>
  22
  23 /**
  24   Save BIST value before call FspInit.
  25
  26   @param Bist   BIST value.
  27 **/
  28 VOID
  29 AsmSaveBistValue (
  30   IN UINT32  Bist
  31   );
  32
  33 /**
  34   Save Ticker value before call FspInit.
  35
  36   @param Ticker   Ticker value.
  37 **/
  38 VOID
  39 AsmSaveTickerValue (
  40   IN UINT64  Ticker
  41   );
  42
  43 /**
  44   Save SEC context before call FspInit.
  45
  46   @param PeiServices  Pointer to PEI Services Table.
  47 **/
  48 VOID
  49 EFIAPI
  50 SaveSecContext (
  51   IN CONST EFI_PEI_SERVICES                     **PeiServices
  52   )
  53 {
  54   UINT32      *Bist;
  55   UINT64      *Ticker;
  56   UINT32      Size;
  57   UINT32      Count;
  58   UINT32      TopOfTemporaryRam;
  59   VOID        *TopOfTemporaryRamPpi;
  60   EFI_STATUS  Status;
  61
  62   DEBUG ((DEBUG_INFO, "SaveSecContext - 0x%x\n", PeiServices));
  63
  64   Status = (*PeiServices)->LocatePpi (
  65                              PeiServices,
  66                              &gTopOfTemporaryRamPpiGuid,
  67                              0,
  68                              NULL,
  69                              (VOID **) &TopOfTemporaryRamPpi
  70                              );
  71   if (EFI_ERROR (Status)) {
  72     return ;
  73   }
  74
  75   DEBUG ((DEBUG_INFO, "TopOfTemporaryRamPpi - 0x%x\n", TopOfTemporaryRamPpi));
  76
  77   //
  78   // The entries of BIST information, together with the number of them,
  79   // reside in the bottom of stack, left untouched by normal stack operation.
  80   // This routine copies the BIST information to the buffer pointed by
  81   // PlatformInformationRecord for output.
  82   //
  83   // |--------------| <- TopOfTemporaryRam
  84   // |Number of BSPs|
  85   // |--------------|
  86   // |     BIST     |
  87   // |--------------|
  88   // |     ....     |
  89   // |--------------|
  90   // |  TSC[63:32]  |
  91   // |--------------|
  92   // |  TSC[31:00]  |
  93   // |--------------|
  94   //
  95
  96   TopOfTemporaryRam = (UINT32)(UINTN)TopOfTemporaryRamPpi - sizeof(UINT32);
  97   TopOfTemporaryRam -= sizeof(UINT32) * 2;
  98   DEBUG ((DEBUG_INFO, "TopOfTemporaryRam - 0x%x\n", TopOfTemporaryRam));
  99   Count             = *(UINT32 *)(UINTN)(TopOfTemporaryRam - sizeof(UINT32));
 100   DEBUG ((DEBUG_INFO, "Count - 0x%x\n", Count));
 101   Size              = Count * sizeof (IA32_HANDOFF_STATUS);
 102   DEBUG ((DEBUG_INFO, "Size - 0x%x\n", Size));
 103
 104   Bist   = (UINT32 *)(UINTN)(TopOfTemporaryRam - sizeof(UINT32) - Size);
 105   DEBUG ((DEBUG_INFO, "Bist - 0x%x\n", *Bist));
 106   Ticker = (UINT64 *)(UINTN)(TopOfTemporaryRam - sizeof(UINT32) - Size - sizeof(UINT64));
 107   DEBUG ((DEBUG_INFO, "Ticker - 0x%lx\n", *Ticker));
 108
 109   //
 110   // Just need record BSP
 111   //
 112   AsmSaveBistValue (*Bist);
 113   AsmSaveTickerValue (*Ticker);
 114 }