DynamicTablesPkg: GTDT updates for ACPI 6.3

[mirror_edk2.git] / IntelFspWrapperPkg / Library / SecPeiFspPlatformSecLibSample / SecPlatformInformation.c

/** @file\r
  Sample to provide SecPlatformInformation function.\r
\r
  Copyright (c) 2014, Intel Corporation. All rights reserved.<BR>\r
  SPDX-License-Identifier: BSD-2-Clause-Patent\r
\r
**/\r
\r
#include <PiPei.h>\r
\r
#include <Ppi/SecPlatformInformation.h>\r
#include <Ppi/TopOfTemporaryRam.h>\r
\r
#include <Library/BaseMemoryLib.h>\r
#include <Library/DebugLib.h>\r
\r
/**\r
  This interface conveys state information out of the Security (SEC) phase into PEI.\r
\r
  @param[in]     PeiServices               Pointer to the PEI Services Table.\r
  @param[in,out] StructureSize             Pointer to the variable describing size of the input buffer.\r
  @param[out]    PlatformInformationRecord Pointer to the EFI_SEC_PLATFORM_INFORMATION_RECORD.\r
\r
  @retval EFI_SUCCESS           The data was successfully returned.\r
  @retval EFI_BUFFER_TOO_SMALL  The buffer was too small.\r
\r
**/\r
EFI_STATUS\r
EFIAPI\r
SecPlatformInformation (\r
  IN CONST EFI_PEI_SERVICES                     **PeiServices,\r
  IN OUT   UINT64                               *StructureSize,\r
     OUT   EFI_SEC_PLATFORM_INFORMATION_RECORD  *PlatformInformationRecord\r
  )\r
{\r
  UINT32      *Bist;\r
  UINT32      Size;\r
  UINT32      Count;\r
  UINT32      TopOfTemporaryRam;\r
  VOID        *TopOfTemporaryRamPpi;\r
  EFI_STATUS  Status;\r
\r
  DEBUG ((DEBUG_INFO, "SecPlatformInformation\n"));\r
\r
  Status = (*PeiServices)->LocatePpi (\r
                             PeiServices,\r
                             &gTopOfTemporaryRamPpiGuid,\r
                             0,\r
                             NULL,\r
                             (VOID **) &TopOfTemporaryRamPpi\r
                             );\r
  if (EFI_ERROR (Status)) {\r
    return EFI_NOT_FOUND;\r
  }\r
\r
  //\r
  // The entries of BIST information, together with the number of them,\r
  // reside in the bottom of stack, left untouched by normal stack operation.\r
  // This routine copies the BIST information to the buffer pointed by\r
  // PlatformInformationRecord for output.\r
  //\r
  TopOfTemporaryRam = (UINT32)(UINTN)TopOfTemporaryRamPpi - sizeof (UINT32);\r
  TopOfTemporaryRam -= sizeof(UINT32) * 2;\r
  Count             = *((UINT32 *)(UINTN) (TopOfTemporaryRam - sizeof (UINT32)));\r
  Size              = Count * sizeof (IA32_HANDOFF_STATUS);\r
\r
  if ((*StructureSize) < (UINT64) Size) {\r
    *StructureSize = Size;\r
    return EFI_BUFFER_TOO_SMALL;\r
  }\r
\r
  *StructureSize  = Size;\r
  Bist            = (UINT32 *) (TopOfTemporaryRam - sizeof (UINT32) - Size);\r
\r
  CopyMem (PlatformInformationRecord, Bist, Size);\r
\r
  return EFI_SUCCESS;\r
}\r