system76-edk2/CorebootModulePkg/SecCore/FindPeiCore.c

/** @file
  Locate the entry point for the PEI Core

Copyright (c) 2013, Intel Corporation. All rights reserved.<BR>
This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
which accompanies this distribution.  The full text of the license may be found at
http://opensource.org/licenses/bsd-license.php

THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.

**/

#include <PiPei.h>
#include <Library/BaseLib.h>
#include <Library/PeCoffGetEntryPointLib.h>

#include "SecMain.h"

/**
  Find core image base.
  
  @param   BootFirmwareVolumePtr    Point to the boot firmware volume.
  @param   SecCoreImageBase         The base address of the SEC core image.
  @param   PeiCoreImageBase         The base address of the PEI core image.

**/
EFI_STATUS
EFIAPI
FindImageBase (
  IN  EFI_FIRMWARE_VOLUME_HEADER       *BootFirmwareVolumePtr,
  OUT EFI_PHYSICAL_ADDRESS             *SecCoreImageBase,
  OUT EFI_PHYSICAL_ADDRESS             *PeiCoreImageBase
  )
{
  EFI_PHYSICAL_ADDRESS        CurrentAddress;
  EFI_PHYSICAL_ADDRESS        EndOfFirmwareVolume;
  EFI_FFS_FILE_HEADER         *File;
  UINT32                      Size;
  EFI_PHYSICAL_ADDRESS        EndOfFile;
  EFI_COMMON_SECTION_HEADER   *Section;
  EFI_PHYSICAL_ADDRESS        EndOfSection;

  *SecCoreImageBase = 0;
  *PeiCoreImageBase = 0;

  CurrentAddress = (EFI_PHYSICAL_ADDRESS)(UINTN) BootFirmwareVolumePtr;
  EndOfFirmwareVolume = CurrentAddress + BootFirmwareVolumePtr->FvLength;

  //
  // Loop through the FFS files in the Boot Firmware Volume
  //
  for (EndOfFile = CurrentAddress + BootFirmwareVolumePtr->HeaderLength; ; ) {

    CurrentAddress = (EndOfFile + 7) & 0xfffffffffffffff8ULL;
    if (CurrentAddress > EndOfFirmwareVolume) {
      return EFI_NOT_FOUND;
    }

    File = (EFI_FFS_FILE_HEADER*)(UINTN) CurrentAddress;
    if (IS_FFS_FILE2 (File)) {
      Size = FFS_FILE2_SIZE (File);
      if (Size <= 0x00FFFFFF) {
        return EFI_NOT_FOUND;
      }
    } else {
      Size = FFS_FILE_SIZE (File);
      if (Size < sizeof (EFI_FFS_FILE_HEADER)) {
        return EFI_NOT_FOUND;
      }
    }

    EndOfFile = CurrentAddress + Size;
    if (EndOfFile > EndOfFirmwareVolume) {
      return EFI_NOT_FOUND;
    }

    //
    // Look for SEC Core / PEI Core files
    //
    if (File->Type != EFI_FV_FILETYPE_SECURITY_CORE &&
        File->Type != EFI_FV_FILETYPE_PEI_CORE) {
      continue;
    }

    //
    // Loop through the FFS file sections within the FFS file
    //
    if (IS_FFS_FILE2 (File)) {
      EndOfSection = (EFI_PHYSICAL_ADDRESS) (UINTN) ((UINT8 *) File + sizeof (EFI_FFS_FILE_HEADER2));
    } else {
      EndOfSection = (EFI_PHYSICAL_ADDRESS) (UINTN) ((UINT8 *) File + sizeof (EFI_FFS_FILE_HEADER));
    }
    for (;;) {
      CurrentAddress = (EndOfSection + 3) & 0xfffffffffffffffcULL;
      Section = (EFI_COMMON_SECTION_HEADER*)(UINTN) CurrentAddress;

      if (IS_SECTION2 (Section)) {
        Size = SECTION2_SIZE (Section);
        if (Size <= 0x00FFFFFF) {
          return EFI_NOT_FOUND;
        }
      } else {
        Size = SECTION_SIZE (Section);
        if (Size < sizeof (EFI_COMMON_SECTION_HEADER)) {
          return EFI_NOT_FOUND;
        }
      }

      EndOfSection = CurrentAddress + Size;
      if (EndOfSection > EndOfFile) {
        return EFI_NOT_FOUND;
      }

      //
      // Look for executable sections
      //
      if (Section->Type == EFI_SECTION_PE32 || Section->Type == EFI_SECTION_TE) {
        if (File->Type == EFI_FV_FILETYPE_SECURITY_CORE) {
          if (IS_SECTION2 (Section)) {
            *SecCoreImageBase = (PHYSICAL_ADDRESS) (UINTN) ((UINT8 *) Section + sizeof (EFI_COMMON_SECTION_HEADER2));
          } else {
            *SecCoreImageBase = (PHYSICAL_ADDRESS) (UINTN) ((UINT8 *) Section + sizeof (EFI_COMMON_SECTION_HEADER));
          }
        } else {
          if (IS_SECTION2 (Section)) {
            *PeiCoreImageBase = (PHYSICAL_ADDRESS) (UINTN) ((UINT8 *) Section + sizeof (EFI_COMMON_SECTION_HEADER2));
          } else {
            *PeiCoreImageBase = (PHYSICAL_ADDRESS) (UINTN) ((UINT8 *) Section + sizeof (EFI_COMMON_SECTION_HEADER));
          }
        }
        break;
      }
    }

    //
    // Both SEC Core and PEI Core images found
    //
    if (*SecCoreImageBase != 0 && *PeiCoreImageBase != 0) {
      return EFI_SUCCESS;
    }
  }
}

/**
  Find and return Pei Core entry point.

  It also find SEC and PEI Core file debug inforamtion. It will report them if
  remote debug is enabled.
  
  @param   BootFirmwareVolumePtr    Point to the boot firmware volume.
  @param   PeiCoreEntryPoint        The entry point of the PEI core.

**/
VOID
EFIAPI
FindAndReportEntryPoints (
  IN  EFI_FIRMWARE_VOLUME_HEADER       *BootFirmwareVolumePtr,
  OUT EFI_PEI_CORE_ENTRY_POINT         *PeiCoreEntryPoint
  )
{
  EFI_STATUS                       Status;
  EFI_PHYSICAL_ADDRESS             SecCoreImageBase;
  EFI_PHYSICAL_ADDRESS             PeiCoreImageBase;
  PE_COFF_LOADER_IMAGE_CONTEXT     ImageContext;

  //
  // Find SEC Core and PEI Core image base
  //
  Status = FindImageBase (BootFirmwareVolumePtr, &SecCoreImageBase, &PeiCoreImageBase);
  ASSERT_EFI_ERROR (Status);

  ZeroMem ((VOID *) &ImageContext, sizeof (PE_COFF_LOADER_IMAGE_CONTEXT));
  //
  // Report SEC Core debug information when remote debug is enabled
  //
  ImageContext.ImageAddress = SecCoreImageBase;
  ImageContext.PdbPointer = PeCoffLoaderGetPdbPointer ((VOID*) (UINTN) ImageContext.ImageAddress);
  PeCoffLoaderRelocateImageExtraAction (&ImageContext);

  //
  // Report PEI Core debug information when remote debug is enabled
  //
  ImageContext.ImageAddress = PeiCoreImageBase;
  ImageContext.PdbPointer = PeCoffLoaderGetPdbPointer ((VOID*) (UINTN) ImageContext.ImageAddress);
  PeCoffLoaderRelocateImageExtraAction (&ImageContext);

  //
  // Find PEI Core entry point
  //
  Status = PeCoffLoaderGetEntryPoint ((VOID *) (UINTN) PeiCoreImageBase, (VOID**) PeiCoreEntryPoint);
  if (EFI_ERROR (Status)) {
    *PeiCoreEntryPoint = 0;
  }

  return;
}