init

hc

2024-03-22 a0752693d998599af469473b8dc239ef973a012f

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