/** @file
  EFI_TAPE_IO_PROTOCOL as defined in the UEFI 2.0.
  Provide services to control and access a tape device.

Copyright (c) 2006 - 2010, 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 that 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.             

**/

#ifndef __EFI_TAPE_IO_PROTOCOL_H__
#define __EFI_TAPE_IO_PROTOCOL_H__

#define EFI_TAPE_IO_PROTOCOL_GUID \
  { \
    0x1e93e633, 0xd65a, 0x459e, {0xab, 0x84, 0x93, 0xd9, 0xec, 0x26, 0x6d, 0x18 } \
  }

typedef struct _EFI_TAPE_IO_PROTOCOL EFI_TAPE_IO_PROTOCOL;

typedef struct _EFI_TAPE_HEADER {
  UINT64     Signature;
  UINT32     Revision;
  UINT32     BootDescSize;
  UINT32     BootDescCRC;
  EFI_GUID   TapeGUID;
  EFI_GUID   TapeType;
  EFI_GUID   TapeUnique;
  UINT32     BLLocation;
  UINT32     BLBlocksize;
  UINT32     BLFilesize;
  CHAR8      OSVersion[40];
  CHAR8      AppVersion[40];
  CHAR8      CreationDate[10];
  CHAR8      CreationTime[10];
  CHAR8      SystemName[256];  // UTF-8
  CHAR8      TapeTitle[120];   // UTF-8
  CHAR8      pad[468];         // pad to 1024
} EFI_TAPE_HEADER;

/**
  Reads from the tape.

  @param  This       A pointer to the EFI_TAPE_IO_PROTOCOL instance.
  @param  BufferSize The size of the buffer in bytes pointed to by Buffer.
  @param  Buffer     The pointer to the buffer for data to be read into.

  @retval EFI_SUCCESS           Data was successfully transferred from the media.
  @retval EFI_END_OF_FILE       A filemark was encountered which limited the data
                                transferred by the read operation or the head is positioned
                                just after a filemark.
  @retval EFI_NO_MEDIA          No media is loaded in the device.
  @retval EFI_NOT_READY         The transfer failed since the device was not ready (e.g. not
                                online). The transfer may be retried at a later time.
  @retval EFI_UNSUPPORTED       The device does not support this type of transfer.
  @retval EFI_TIMEOUT           The transfer failed to complete within the timeout specified.
  @retval EFI_MEDIA_CHANGED     The media in the device was changed since the last access.
                                The transfer was aborted since the current position of the
                                media may be incorrect.
  @retval EFI_INVALID_PARAMETER A NULL Buffer was specified with a non-zero
                                BufferSize, or the device is operating in fixed block
                                size mode and the BufferSize was not a multiple of
                                device's fixed block size
  @retval EFI_DEVICE_ERROR      A device error occurred while attempting to transfer data
                                from the media.

**/
typedef 
EFI_STATUS
(EFIAPI *EFI_TAPE_READ)(
  IN EFI_TAPE_IO_PROTOCOL *This,
  IN OUT UINTN            *BufferSize,
  OUT VOID                *Buffer
  );    

/**
  Writes to the tape.

  @param  This       A pointer to the EFI_TAPE_IO_PROTOCOL instance.
  @param  BufferSize Size of the buffer in bytes pointed to by Buffer.
  @param  Buffer     The pointer to the buffer for data to be written from.

  @retval EFI_SUCCESS           Data was successfully transferred to the media.
  @retval EFI_END_OF_MEDIA      The logical end of media has been reached. Data may have
                                been successfully transferred to the media.
  @retval EFI_NO_MEDIA          No media is loaded in the device.
  @retval EFI_NOT_READY         The transfer failed since the device was not ready (e.g. not
                                online). The transfer may be retried at a later time.
  @retval EFI_UNSUPPORTED       The device does not support this type of transfer.
  @retval EFI_TIMEOUT           The transfer failed to complete within the timeout specified.
  @retval EFI_MEDIA_CHANGED     The media in the device was changed since the last access.
                                The transfer was aborted since the current position of the
                                media may be incorrect.
  @retval EFI_WRITE_PROTECTED   The media in the device is write-protected. The transfer
                                was aborted since a write cannot be completed.
  @retval EFI_INVALID_PARAMETER A NULL Buffer was specified with a non-zero
                                BufferSize, or the device is operating in fixed block
                                size mode and the BufferSize was not a multiple of
                                device's fixed block size
  @retval EFI_DEVICE_ERROR      A device error occurred while attempting to transfer data
                                from the media.

**/
typedef 
EFI_STATUS
(EFIAPI *EFI_TAPE_WRITE)(
  IN EFI_TAPE_IO_PROTOCOL *This,
  IN UINTN                *BufferSize,
  IN VOID                 *Buffer
  ); 
  

/**
  Rewinds the tape.

  @param  This A pointer to the EFI_TAPE_IO_PROTOCOL instance.

  @retval EFI_SUCCESS      The media was successfully repositioned.
  @retval EFI_NO_MEDIA     No media is loaded in the device.
  @retval EFI_NOT_READY    Repositioning the media failed since the device was not
                           ready (e.g. not online). The transfer may be retried at a later time.
  @retval EFI_UNSUPPORTED  The device does not support this type of media repositioning.
  @retval EFI_TIMEOUT      Repositioning of the media did not complete within the timeout specified.
  @retval EFI_DEVICE_ERROR A device error occurred while attempting to reposition the media.

**/
typedef 
EFI_STATUS
(EFIAPI *EFI_TAPE_REWIND)(
  IN EFI_TAPE_IO_PROTOCOL *This
  );   


/**
  Positions the tape.

  @param  This      A pointer to the EFI_TAPE_IO_PROTOCOL instance.
  @param  Direction Direction and number of data blocks or filemarks to space over on media.
  @param  Type      Type of mark to space over on media.
                    The following Type marks are mandatory:
                    BLOCK type    : 0 
                    FILEMARK type : 1

  @retval EFI_SUCCESS       The media was successfully repositioned.
  @retval EFI_END_OF_MEDIA  Beginning or end of media was reached before the
                            indicated number of data blocks or filemarks were found.
  @retval EFI_NO_MEDIA      No media is loaded in the device.
  @retval EFI_NOT_READY     The reposition failed since the device was not ready (e.g. not
                            online). The reposition may be retried at a later time.
  @retval EFI_UNSUPPORTED   The device does not support this type of repositioning.
  @retval EFI_TIMEOUT       The repositioning failed to complete within the timeout specified.
  @retval EFI_MEDIA_CHANGED The media in the device was changed since the last access.
                            Repositioning the media was aborted since the current
                            position of the media may be incorrect.
  @retval EFI_DEVICE_ERROR  A device error occurred while attempting to reposition the media.

**/
typedef
EFI_STATUS
(EFIAPI *EFI_TAPE_SPACE)(
  IN EFI_TAPE_IO_PROTOCOL *This,
  IN INTN                 Direction,
  IN UINTN                Type
  );   


/**
  Writes filemarks to the media.

  @param  This  A pointer to the EFI_TAPE_IO_PROTOCOL instance.
  @param  Count Number of filemarks to write to the media.

  @retval EFI_SUCCESS       Data was successfully transferred from the media.
  @retval EFI_NO_MEDIA      No media is loaded in the device.
  @retval EFI_NOT_READY     The transfer failed since the device was not ready (e.g. not
                            online). The transfer may be retried at a later time.
  @retval EFI_UNSUPPORTED   The device does not support this type of repositioning.
  @retval EFI_TIMEOUT       The transfer failed to complete within the timeout specified.
  @retval EFI_MEDIA_CHANGED The media in the device was changed since the last access.
                            The transfer was aborted since the current position of the
                            media may be incorrect.
  @retval EFI_DEVICE_ERROR  A device error occurred while attempting to transfer data from the media.

**/
typedef 
EFI_STATUS
(EFIAPI *EFI_TAPE_WRITEFM)(
  IN EFI_TAPE_IO_PROTOCOL *This,
  IN UINTN                Count
  );   


/**
  Resets the tape device.

  @param  This                 A pointer to the EFI_TAPE_IO_PROTOCOL instance.
  @param  ExtendedVerification Indicates whether the parent bus should also be reset.

  @retval  EFI_SUCCESS      The bus and/or device were successfully reset.
  @retval  EFI_NO_MEDIA     No media is loaded in the device.
  @retval  EFI_NOT_READY    The reset failed since the device and/or bus was not ready.
                            The reset may be retried at a later time.
  @retval  EFI_UNSUPPORTED  The device does not support this type of reset.
  @retval  EFI_TIMEOUT      The reset did not complete within the timeout allowed.
  @retval  EFI_DEVICE_ERROR A device error occurred while attempting to reset the bus and/or device.

**/
typedef 
EFI_STATUS
(EFIAPI *EFI_TAPE_RESET)(
  IN EFI_TAPE_IO_PROTOCOL *This,
  IN BOOLEAN              ExtendedVerification
  );    

///
/// The EFI_TAPE_IO_PROTOCOL provides basic sequential operations for tape devices. 
/// These include read, write, rewind, space, write filemarks and reset functions. 
/// Per this specification, a boot application uses the services of this protocol 
/// to load the bootloader image from tape.
///
struct _EFI_TAPE_IO_PROTOCOL {
  EFI_TAPE_READ           TapeRead;
  EFI_TAPE_WRITE          TapeWrite;
  EFI_TAPE_REWIND         TapeRewind;
  EFI_TAPE_SPACE          TapeSpace;
  EFI_TAPE_WRITEFM        TapeWriteFM;
  EFI_TAPE_RESET          TapeReset;
};

extern EFI_GUID gEfiTapeIoProtocolGuid;

#endif
