SecGetPerformance.c

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#include <PiPei.h>
 
#include <Ppi/SecPerformance.h>
#include <Ppi/TopOfTemporaryRam.h>
 
#include <Library/BaseMemoryLib.h>
#include <Library/TimerLib.h>
#include <Library/DebugLib.h>
 
EFI_STATUS
EFIAPI
SecGetPerformance (
  IN CONST EFI_PEI_SERVICES          **PeiServices,
  IN       PEI_SEC_PERFORMANCE_PPI   *This,
  OUT      FIRMWARE_SEC_PERFORMANCE  *Performance
  )
{
  UINT32      Size;
  UINT32      Count;
  UINT32      TopOfTemporaryRam;
  UINT64      Ticker;
  VOID        *TopOfTemporaryRamPpi;
  EFI_STATUS  Status;
 
  DEBUG ((DEBUG_INFO, "SecGetPerformance\n"));
 
  Status = (*PeiServices)->LocatePpi (
                             PeiServices,
                             &gTopOfTemporaryRamPpiGuid,
                             0,
                             NULL,
                             (VOID **)&TopOfTemporaryRamPpi
                             );
  if (EFI_ERROR (Status)) {
    return EFI_NOT_FOUND;
  }
 
  //
  // |--------------| <- TopOfTemporaryRam
  // |Number of BSPs|
  // |--------------|
  // |     BIST     |
  // |--------------|
  // |     ....     |
  // |--------------|
  // |  TSC[63:32]  |
  // |--------------|
  // |  TSC[31:00]  |
  // |--------------|
  //
  TopOfTemporaryRam  = (UINT32)(UINTN)TopOfTemporaryRamPpi - sizeof (UINT32);
  TopOfTemporaryRam -= sizeof (UINT32) * 2;
  Count              = *(UINT32 *)(UINTN)(TopOfTemporaryRam - sizeof (UINT32));
  Size               = Count * sizeof (UINT64);
 
  Ticker                = *(UINT64 *)(UINTN)(TopOfTemporaryRam - sizeof (UINT32) - Size - sizeof (UINT32) * 2);
  Performance->ResetEnd = GetTimeInNanoSecond (Ticker);
 
  return EFI_SUCCESS;
}