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   This program and the accompanying materials
   6   are licensed and made available under the terms and conditions of the BSD License
   7   which accompanies this distribution.  The full text of the license may be found at
   8   http://opensource.org/licenses/bsd-license.php.
   9
  10   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  11   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  12
  13 **/
  14
  15
  16 #include <PiPei.h>
  17 #include <Library/DebugLib.h>
  18
  19 #include <Ppi/TopOfTemporaryRam.h>
  20 #include <Ppi/SecPlatformInformation.h>
  21
  22 /**
  23   Save BIST value before call FspInit.
  24
  25   @param[in] Bist   BIST value.
  26 **/
  27 VOID
  28 AsmSaveBistValue (
  29   IN UINT32  Bist
  30   );
  31
  32 /**
  33   Save Ticker value before call FspInit.
  34
  35   @param[in] Ticker   Ticker value.
  36 **/
  37 VOID
  38 AsmSaveTickerValue (
  39   IN UINT64  Ticker
  40   );
  41
  42 /**
  43   Save SEC context before call FspInit.
  44
  45   @param[in] PeiServices  Pointer to PEI Services Table.
  46 **/
  47 VOID
  48 EFIAPI
  49 SaveSecContext (
  50   IN CONST EFI_PEI_SERVICES                     **PeiServices
  51   )
  52 {
  53   UINT32      *Bist;
  54   UINT64      *Ticker;
  55   UINT32      Size;
  56   UINT32      Count;
  57   UINT32      TopOfTemporaryRam;
  58   VOID        *TopOfTemporaryRamPpi;
  59   EFI_STATUS  Status;
  60
  61   DEBUG ((DEBUG_INFO, "SaveSecContext - 0x%x\n", PeiServices));
  62
  63   Status = (*PeiServices)->LocatePpi (
  64                              PeiServices,
  65                              &gTopOfTemporaryRamPpiGuid,
  66                              0,
  67                              NULL,
  68                              (VOID **) &TopOfTemporaryRamPpi
  69                              );
  70   if (EFI_ERROR (Status)) {
  71     return ;
  72   }
  73
  74   DEBUG ((DEBUG_INFO, "TopOfTemporaryRamPpi - 0x%x\n", TopOfTemporaryRamPpi));
  75
  76   //
  77   // The entries of BIST information, together with the number of them,
  78   // reside in the bottom of stack, left untouched by normal stack operation.
  79   // This routine copies the BIST information to the buffer pointed by
  80   // PlatformInformationRecord for output.
  81   //
  82   // |--------------| <- TopOfTemporaryRam
  83   // |Number of BSPs|
  84   // |--------------|
  85   // |     BIST     |
  86   // |--------------|
  87   // |     ....     |
  88   // |--------------|
  89   // |  TSC[63:32]  |
  90   // |--------------|
  91   // |  TSC[31:00]  |
  92   // |--------------|
  93   //
  94
  95   TopOfTemporaryRam = (UINT32)(UINTN)TopOfTemporaryRamPpi - sizeof(UINT32);
  96   TopOfTemporaryRam -= sizeof(UINT32) * 2;
  97   DEBUG ((DEBUG_INFO, "TopOfTemporaryRam - 0x%x\n", TopOfTemporaryRam));
  98   Count             = *(UINT32 *)(UINTN)(TopOfTemporaryRam - sizeof(UINT32));
  99   DEBUG ((DEBUG_INFO, "Count - 0x%x\n", Count));
 100   Size              = Count * sizeof (IA32_HANDOFF_STATUS);
 101   DEBUG ((DEBUG_INFO, "Size - 0x%x\n", Size));
 102
 103   Bist   = (UINT32 *)(UINTN)(TopOfTemporaryRam - sizeof(UINT32) - Size);
 104   DEBUG ((DEBUG_INFO, "Bist - 0x%x\n", *Bist));
 105   Ticker = (UINT64 *)(UINTN)(TopOfTemporaryRam - sizeof(UINT32) - Size - sizeof(UINT64));
 106   DEBUG ((DEBUG_INFO, "Ticker - 0x%lx\n", *Ticker));
 107
 108   // Just need record BSP
 109   AsmSaveBistValue (*Bist);
 110   AsmSaveTickerValue (*Ticker);
 111 }