PrePiLib.c

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#include <PrePi.h>
 
//
// Hack to work in NT32
//
EFI_STATUS
 
EFIAPI
 
SecWinNtPeiLoadFile (
  IN  VOID                  *Pe32Data,
  IN  EFI_PHYSICAL_ADDRESS  *ImageAddress,
  IN  UINT64                *ImageSize,
  IN  EFI_PHYSICAL_ADDRESS  *EntryPoint
  );
 
STATIC
VOID *
EFIAPI
AllocateCodePages (
  IN  UINTN  Pages
  )
{
  VOID                  *Alloc;
  EFI_PEI_HOB_POINTERS  Hob;
 
  Alloc = AllocatePages (Pages);
  if (Alloc == NULL) {
    return NULL;
  }
 
  // find the HOB we just created, and change the type to EfiBootServicesCode
  Hob.Raw = GetFirstHob (EFI_HOB_TYPE_MEMORY_ALLOCATION);
  while (Hob.Raw != NULL) {
    if (Hob.MemoryAllocation->AllocDescriptor.MemoryBaseAddress == (UINTN)Alloc) {
      Hob.MemoryAllocation->AllocDescriptor.MemoryType = EfiBootServicesCode;
      return Alloc;
    }
 
    Hob.Raw = GetNextHob (EFI_HOB_TYPE_MEMORY_ALLOCATION, GET_NEXT_HOB (Hob));
  }
 
  ASSERT (FALSE);
 
  FreePages (Alloc, Pages);
  return NULL;
}
 
EFI_STATUS
EFIAPI
LoadPeCoffImage (
  IN  VOID                  *PeCoffImage,
  OUT EFI_PHYSICAL_ADDRESS  *ImageAddress,
  OUT UINT64                *ImageSize,
  OUT EFI_PHYSICAL_ADDRESS  *EntryPoint
  )
{
  RETURN_STATUS                 Status;
  PE_COFF_LOADER_IMAGE_CONTEXT  ImageContext;
  VOID                          *Buffer;
 
  ZeroMem (&ImageContext, sizeof (ImageContext));
 
  ImageContext.Handle    = PeCoffImage;
  ImageContext.ImageRead = PeCoffLoaderImageReadFromMemory;
 
  Status = PeCoffLoaderGetImageInfo (&ImageContext);
  ASSERT_EFI_ERROR (Status);
 
  //
  // Allocate Memory for the image
  //
  Buffer = AllocateCodePages (EFI_SIZE_TO_PAGES ((UINT32)ImageContext.ImageSize));
  ASSERT (Buffer != 0);
 
  ImageContext.ImageAddress = (EFI_PHYSICAL_ADDRESS)(UINTN)Buffer;
 
  //
  // Load the image to our new buffer
  //
  Status = PeCoffLoaderLoadImage (&ImageContext);
  ASSERT_EFI_ERROR (Status);
 
  //
  // Relocate the image in our new buffer
  //
  Status = PeCoffLoaderRelocateImage (&ImageContext);
  ASSERT_EFI_ERROR (Status);
 
  *ImageAddress = ImageContext.ImageAddress;
  *ImageSize    = ImageContext.ImageSize;
  *EntryPoint   = ImageContext.EntryPoint;
 
  //
  // Flush not needed for all architectures. We could have a processor specific
  // function in this library that does the no-op if needed.
  //
  InvalidateInstructionCacheRange ((VOID *)(UINTN)*ImageAddress, (UINTN)*ImageSize);
 
  return Status;
}
 
typedef
VOID
(EFIAPI *DXE_CORE_ENTRY_POINT)(
  IN  VOID *HobStart
  );
 
EFI_STATUS
EFIAPI
LoadDxeCoreFromFfsFile (
  IN EFI_PEI_FILE_HANDLE  FileHandle,
  IN UINTN                StackSize
  )
{
  EFI_STATUS            Status;
  VOID                  *PeCoffImage;
  EFI_PHYSICAL_ADDRESS  ImageAddress;
  UINT64                ImageSize;
  EFI_PHYSICAL_ADDRESS  EntryPoint;
  VOID                  *BaseOfStack;
  VOID                  *TopOfStack;
  VOID                  *Hob;
  EFI_FV_FILE_INFO      FvFileInfo;
 
  Status = FfsFindSectionDataWithHook (EFI_SECTION_PE32, NULL, FileHandle, &PeCoffImage);
  if (EFI_ERROR (Status)) {
    return Status;
  }
 
  Status = LoadPeCoffImage (PeCoffImage, &ImageAddress, &ImageSize, &EntryPoint);
  // For NT32 Debug  Status = SecWinNtPeiLoadFile (PeCoffImage, &ImageAddress, &ImageSize, &EntryPoint);
  ASSERT_EFI_ERROR (Status);
 
  //
  // Extract the DxeCore GUID file name.
  //
  Status = FfsGetFileInfo (FileHandle, &FvFileInfo);
  ASSERT_EFI_ERROR (Status);
 
  BuildModuleHob (&FvFileInfo.FileName, (EFI_PHYSICAL_ADDRESS)(UINTN)ImageAddress, EFI_SIZE_TO_PAGES ((UINT32)ImageSize) * EFI_PAGE_SIZE, EntryPoint);
 
  DEBUG ((DEBUG_INFO | DEBUG_LOAD, "Loading DxeCore at 0x%10p EntryPoint=0x%10p\n", (VOID *)(UINTN)ImageAddress, (VOID *)(UINTN)EntryPoint));
 
  Hob = GetHobList ();
  if (StackSize == 0) {
    // User the current stack
 
    ((DXE_CORE_ENTRY_POINT)(UINTN)EntryPoint)(Hob);
  } else {
    //
    // Allocate 128KB for the Stack
    //
    BaseOfStack = AllocatePages (EFI_SIZE_TO_PAGES (StackSize));
    ASSERT (BaseOfStack != NULL);
 
    //
    // Compute the top of the stack we were allocated. Pre-allocate a UINTN
    // for safety.
    //
    TopOfStack = (VOID *)((UINTN)BaseOfStack + EFI_SIZE_TO_PAGES (StackSize) * EFI_PAGE_SIZE - CPU_STACK_ALIGNMENT);
    TopOfStack = ALIGN_POINTER (TopOfStack, CPU_STACK_ALIGNMENT);
 
    //
    // Update the contents of BSP stack HOB to reflect the real stack info passed to DxeCore.
    //
    UpdateStackHob ((EFI_PHYSICAL_ADDRESS)(UINTN)BaseOfStack, StackSize);
 
    SwitchStack (
      (SWITCH_STACK_ENTRY_POINT)(UINTN)EntryPoint,
      Hob,
      NULL,
      TopOfStack
      );
  }
 
  // Should never get here as DXE Core does not return
  DEBUG ((DEBUG_ERROR, "DxeCore returned\n"));
  ASSERT (FALSE);
 
  return EFI_DEVICE_ERROR;
}
 
EFI_STATUS
EFIAPI
LoadDxeCoreFromFv (
  IN UINTN  *FvInstance    OPTIONAL,
  IN UINTN  StackSize
  )
{
  EFI_STATUS           Status;
  EFI_PEI_FV_HANDLE    VolumeHandle;
  EFI_PEI_FILE_HANDLE  FileHandle = NULL;
 
  if (FvInstance != NULL) {
    //
    // Caller passed in a specific FV to try, so only try that one
    //
    Status = FfsFindNextVolume (*FvInstance, &VolumeHandle);
    if (!EFI_ERROR (Status)) {
      Status = FfsFindNextFile (EFI_FV_FILETYPE_DXE_CORE, VolumeHandle, &FileHandle);
    }
  } else {
    Status = FfsAnyFvFindFirstFile (EFI_FV_FILETYPE_DXE_CORE, &VolumeHandle, &FileHandle);
  }
 
  if (!EFI_ERROR (Status)) {
    return LoadDxeCoreFromFfsFile (FileHandle, StackSize);
  }
 
  return Status;
}
 
EFI_STATUS
EFIAPI
DecompressFirstFv (
  VOID
  )
{
  EFI_STATUS           Status;
  EFI_PEI_FV_HANDLE    VolumeHandle;
  EFI_PEI_FILE_HANDLE  FileHandle;
 
  Status = FfsAnyFvFindFirstFile (EFI_FV_FILETYPE_FIRMWARE_VOLUME_IMAGE, &VolumeHandle, &FileHandle);
  if (!EFI_ERROR (Status)) {
    Status = FfsProcessFvFile (FileHandle);
  }
 
  return Status;
}