Sec.c

/*++ @file
  Stub SEC that is called from the OS application that is the root of the emulator.
 
  The OS application will call the SEC with the PEI Entry Point API.
 
Copyright (c) 2011, Apple Inc. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
 
**/
 
#include "Sec.h"
 
EFI_PEI_TEMPORARY_RAM_SUPPORT_PPI  mSecTemporaryRamSupportPpi = {
  SecTemporaryRamSupport
};
 
EFI_PEI_PPI_DESCRIPTOR  gPrivateDispatchTable[] = {
  {
    EFI_PEI_PPI_DESCRIPTOR_PPI | EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST,
    &gEfiTemporaryRamSupportPpiGuid,
    &mSecTemporaryRamSupportPpi
  }
};
 
VOID
EFIAPI
_ModuleEntryPoint (
  IN EFI_SEC_PEI_HAND_OFF    *SecCoreData,
  IN EFI_PEI_PPI_DESCRIPTOR  *PpiList
  )
{
  EFI_STATUS                Status;
  EFI_PEI_FV_HANDLE         VolumeHandle;
  EFI_PEI_FILE_HANDLE       FileHandle;
  VOID                      *PeCoffImage;
  EFI_PEI_CORE_ENTRY_POINT  EntryPoint;
  EFI_PEI_PPI_DESCRIPTOR    *Ppi;
  EFI_PEI_PPI_DESCRIPTOR    *SecPpiList;
  UINTN                     SecReseveredMemorySize;
  UINTN                     Index;
  EFI_PEI_PPI_DESCRIPTOR    PpiArray[10];
 
  EMU_MAGIC_PAGE ()->PpiList = PpiList;
  ProcessLibraryConstructorList ();
 
  DEBUG ((DEBUG_ERROR, "SEC Has Started\n"));
 
  //
  // Add Our PPIs to the list
  //
  SecReseveredMemorySize = sizeof (gPrivateDispatchTable);
  for (Ppi = PpiList, Index = 1; ; Ppi++, Index++) {
    SecReseveredMemorySize += sizeof (EFI_PEI_PPI_DESCRIPTOR);
 
    if ((Ppi->Flags & EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST) == EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST) {
      // Since we are appending, need to clear out previous list terminator.
      Ppi->Flags &= ~EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST;
      break;
    }
  }
 
  // Keep everything on a good alignment
  SecReseveredMemorySize = ALIGN_VALUE (SecReseveredMemorySize, CPU_STACK_ALIGNMENT);
 
 #if 0
  // Tell the PEI Core to not use our buffer in temp RAM
  SecPpiList                        = (EFI_PEI_PPI_DESCRIPTOR *)SecCoreData->PeiTemporaryRamBase;
  SecCoreData->PeiTemporaryRamBase  = (VOID *)((UINTN)SecCoreData->PeiTemporaryRamBase + SecReseveredMemorySize);
  SecCoreData->PeiTemporaryRamSize -= SecReseveredMemorySize;
 #else
  //
  // When I subtrack from SecCoreData->PeiTemporaryRamBase PEI Core crashes? Either there is a bug
  // or I don't understand temp RAM correctly?
  //
 
  SecPpiList = &PpiArray[0];
  ASSERT (sizeof (PpiArray) >= SecReseveredMemorySize);
 #endif
  // Copy existing list, and append our entries.
  CopyMem (SecPpiList, PpiList, sizeof (EFI_PEI_PPI_DESCRIPTOR) * Index);
  CopyMem (&SecPpiList[Index], gPrivateDispatchTable, sizeof (gPrivateDispatchTable));
 
  // Find PEI Core and transfer control
  VolumeHandle = (EFI_PEI_FV_HANDLE)(UINTN)SecCoreData->BootFirmwareVolumeBase;
  FileHandle   = NULL;
  Status       = PeiServicesFfsFindNextFile (EFI_FV_FILETYPE_PEI_CORE, VolumeHandle, &FileHandle);
  ASSERT_EFI_ERROR (Status);
 
  Status = PeiServicesFfsFindSectionData (EFI_SECTION_PE32, FileHandle, &PeCoffImage);
  ASSERT_EFI_ERROR (Status);
 
  Status = PeCoffLoaderGetEntryPoint (PeCoffImage, (VOID **)&EntryPoint);
  ASSERT_EFI_ERROR (Status);
 
  // Transfer control to PEI Core
  EntryPoint (SecCoreData, SecPpiList);
 
  // PEI Core never returns
  ASSERT (FALSE);
  return;
}