Exemplo n.º 1
0
/**
  Write BufferSize bytes from Lba into Buffer.

  This function writes the requested number of blocks to the device. All blocks
  are written, or an error is returned.If EFI_DEVICE_ERROR, EFI_NO_MEDIA,
  EFI_WRITE_PROTECTED or EFI_MEDIA_CHANGED is returned and non-blocking I/O is
  being used, the Event associated with this request will not be signaled.

  @param[in]       This       Indicates a pointer to the calling context.
  @param[in]       MediaId    The media ID that the write request is for.
  @param[in]       Lba        The starting logical block address to be written. The
                              caller is responsible for writing to only legitimate
                              locations.
  @param[in, out]  Token      A pointer to the token associated with the transaction.
  @param[in]       BufferSize Size of Buffer, must be a multiple of device block size.
  @param[in]       Buffer     A pointer to the source buffer for the data.

  @retval EFI_SUCCESS           The write request was queued if Event is not NULL.
                                The data was written correctly to the device if
                                the Event is NULL.
  @retval EFI_WRITE_PROTECTED   The device can not be written to.
  @retval EFI_NO_MEDIA          There is no media in the device.
  @retval EFI_MEDIA_CHNAGED     The MediaId does not matched the current device.
  @retval EFI_DEVICE_ERROR      The device reported an error while performing the write.
  @retval EFI_BAD_BUFFER_SIZE   The Buffer was not a multiple of the block size of the device.
  @retval EFI_INVALID_PARAMETER The write request contains LBAs that are not valid,
                                or the buffer is not on proper alignment.
  @retval EFI_OUT_OF_RESOURCES  The request could not be completed due to a lack
                                of resources.

**/
EFI_STATUS
EFIAPI
PartitionWriteBlocksEx (
  IN     EFI_BLOCK_IO2_PROTOCOL *This,
  IN     UINT32                 MediaId,
  IN     EFI_LBA                Lba,
  IN OUT EFI_BLOCK_IO2_TOKEN    *Token,
  IN     UINTN                  BufferSize,
  IN     VOID                   *Buffer
  )
{
  PARTITION_PRIVATE_DATA  *Private;
  UINT64                  Offset;
  UINT32                  UnderRun;

  Private = PARTITION_DEVICE_FROM_BLOCK_IO2_THIS (This);

  if (Token == NULL) {
    return ProbeMediaStatusEx (Private->ParentBlockIo2, MediaId, EFI_INVALID_PARAMETER);
  }

  if (BufferSize % Private->BlockSize != 0) {
    return ProbeMediaStatusEx (Private->ParentBlockIo2, MediaId, EFI_BAD_BUFFER_SIZE);
  }

  Offset = MultU64x32 (Lba, Private->BlockSize) + Private->Start;
  if (Offset + BufferSize > Private->End) {
    return ProbeMediaStatusEx (Private->ParentBlockIo2, MediaId, EFI_INVALID_PARAMETER);
  }

  //
  // Since the BlockIO2 call Parent BlockIO2 directly, so here the offset must
  // be multiple of BlockSize. If the Spec will be updated the DiskIO to support
  // BlockIO2, this limitation will be removed and call DiskIO here.
  //
  Lba = DivU64x32Remainder (Offset, Private->BlockSize, &UnderRun);
  if (UnderRun != 0) {
    return ProbeMediaStatusEx (Private->ParentBlockIo2, MediaId, EFI_UNSUPPORTED);
  }

  //
  // Because some kinds of partition have different block size from their parent,
  // in that case it couldn't call parent Block I/O2.
  //
  if (Private->BlockSize != Private->ParentBlockIo->Media->BlockSize) {
    return ProbeMediaStatusEx (Private->ParentBlockIo2, MediaId, EFI_UNSUPPORTED);
  }

  return Private->ParentBlockIo2->WriteBlocksEx (Private->ParentBlockIo2, MediaId, Lba, Token, BufferSize, Buffer);
}
Exemplo n.º 2
0
/**
  Read BufferSize bytes from Lba into Buffer.
  
  This function reads the requested number of blocks from the device. All the
  blocks are read, or an error is returned.
  If EFI_DEVICE_ERROR, EFI_NO_MEDIA,_or EFI_MEDIA_CHANGED is returned and
  non-blocking I/O is being used, the Event associated with this request will
  not be signaled.

  @param[in]       This       Indicates a pointer to the calling context.
  @param[in]       MediaId    Id of the media, changes every time the media is 
                              replaced.
  @param[in]       Lba        The starting Logical Block Address to read from.
  @param[in, out]  Token	    A pointer to the token associated with the transaction.
  @param[in]       BufferSize Size of Buffer, must be a multiple of device block size.  
  @param[out]      Buffer     A pointer to the destination buffer for the data. The 
                              caller is responsible for either having implicit or 
                              explicit ownership of the buffer.

  @retval EFI_SUCCESS           The read request was queued if Token->Event is
                                not NULL.The data was read correctly from the
                                device if the Token->Event is NULL.
  @retval EFI_DEVICE_ERROR      The device reported an error while performing
                                the read.
  @retval EFI_NO_MEDIA          There is no media in the device.
  @retval EFI_MEDIA_CHANGED     The MediaId is not for the current media.
  @retval EFI_BAD_BUFFER_SIZE   The BufferSize parameter is not a multiple of the
                                intrinsic block size of the device.
  @retval EFI_INVALID_PARAMETER The read request contains LBAs that are not valid, 
                                or the buffer is not on proper alignment.
  @retval EFI_OUT_OF_RESOURCES  The request could not be completed due to a lack
                                of resources.
**/
EFI_STATUS
EFIAPI
PartitionReadBlocksEx (
  IN     EFI_BLOCK_IO2_PROTOCOL *This,
  IN     UINT32                 MediaId,
  IN     EFI_LBA                Lba,
  IN OUT EFI_BLOCK_IO2_TOKEN    *Token,
  IN     UINTN                  BufferSize,
  OUT    VOID                   *Buffer
  )
{
  EFI_STATUS              Status;
  PARTITION_PRIVATE_DATA  *Private;
  UINT64                  Offset;
  PARTITION_ACCESS_TASK   *Task;

  Private = PARTITION_DEVICE_FROM_BLOCK_IO2_THIS (This);

  if (BufferSize % Private->BlockSize != 0) {
    return ProbeMediaStatusEx (Private->DiskIo2, MediaId, EFI_BAD_BUFFER_SIZE);
  }

  Offset = MultU64x32 (Lba, Private->BlockSize) + Private->Start;
  if (Offset + BufferSize > Private->End) {
    return ProbeMediaStatusEx (Private->DiskIo2, MediaId, EFI_INVALID_PARAMETER);
  }

  if ((Token != NULL) && (Token->Event != NULL)) {
    Task = PartitionCreateAccessTask (Token);
    if (Task == NULL) {
      return EFI_OUT_OF_RESOURCES;
    }

    Status = Private->DiskIo2->ReadDiskEx (Private->DiskIo2, MediaId, Offset, &Task->DiskIo2Token, BufferSize, Buffer);
    if (EFI_ERROR (Status)) {
      gBS->CloseEvent (Task->DiskIo2Token.Event);
      FreePool (Task);
    }
  } else {
    Status = Private->DiskIo2->ReadDiskEx (Private->DiskIo2, MediaId, Offset, NULL, BufferSize, Buffer);
  }

  return Status;
}