audk/ArmPkg/Filesystem/SemihostFs/Arm/SemihostFs.h

/** @file
  Support a Semi Host file system over a debuggers JTAG

  Copyright (c) 2008 - 2009, Apple Inc. 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.

**/

#ifndef __SEMIHOST_FS_H__
#define __SEMIHOST_FS_H__

EFI_STATUS
VolumeOpen (
  IN  EFI_SIMPLE_FILE_SYSTEM_PROTOCOL *This,
  OUT EFI_FILE                        **Root
  );

/**
  Open a file on the host system by means of the semihosting interface.

  @param[in]   This        A pointer to the EFI_FILE_PROTOCOL instance that is
                           the file handle to source location.
  @param[out]  NewHandle   A pointer to the location to return the opened
                           handle for the new file.
  @param[in]   FileName    The Null-terminated string of the name of the file
                           to be opened.
  @param[in]   OpenMode    The mode to open the file : Read or Read/Write or
                           Read/Write/Create
  @param[in]   Attributes  Only valid for EFI_FILE_MODE_CREATE, in which case these
                           are the attribute bits for the newly created file. The
                           mnemonics of the attribute bits are : EFI_FILE_READ_ONLY,
                           EFI_FILE_HIDDEN, EFI_FILE_SYSTEM, EFI_FILE_RESERVED,
                           EFI_FILE_DIRECTORY and EFI_FILE_ARCHIVE.

  @retval  EFI_SUCCESS            The file was open.
  @retval  EFI_NOT_FOUND          The specified file could not be found.
  @retval  EFI_DEVICE_ERROR       The last issued semi-hosting operation failed.
  @retval  EFI_WRITE_PROTECTED    Attempt to create a directory. This is not possible
                                  with the semi-hosting interface.
  @retval  EFI_OUT_OF_RESOURCES   Not enough resources were available to open the file.
  @retval  EFI_INVALID_PARAMETER  At least one of the parameters is invalid.

**/
EFI_STATUS
FileOpen (
  IN  EFI_FILE  *This,
  OUT EFI_FILE  **NewHandle,
  IN  CHAR16    *FileName,
  IN  UINT64    OpenMode,
  IN  UINT64    Attributes
  );

/**
  Close a specified file handle.

  @param[in]  This  A pointer to the EFI_FILE_PROTOCOL instance that is the file
                    handle to close.

  @retval  EFI_SUCCESS            The file was closed.
  @retval  EFI_INVALID_PARAMETER  The parameter "This" is NULL.

**/
EFI_STATUS
FileClose (
  IN EFI_FILE  *This
  );

/**
  Close and delete a file.

  @param[in]  This  A pointer to the EFI_FILE_PROTOCOL instance that is the file
                    handle to delete.

  @retval  EFI_SUCCESS              The file was closed and deleted.
  @retval  EFI_WARN_DELETE_FAILURE  The handle was closed, but the file was not deleted.
  @retval  EFI_INVALID_PARAMETER    The parameter "This" is NULL.

**/
EFI_STATUS
FileDelete (
  IN EFI_FILE *This
  );

/**
  Read data from an open file.

  @param[in]      This        A pointer to the EFI_FILE_PROTOCOL instance that
                              is the file handle to read data from.
  @param[in out]  BufferSize  On input, the size of the Buffer. On output, the
                              amount of data returned in Buffer. In both cases,
                              the size is measured in bytes.
  @param[out]     Buffer      The buffer into which the data is read.

  @retval  EFI_SUCCESS            The data was read.
  @retval  EFI_DEVICE_ERROR       On entry, the current file position is
                                  beyond the end of the file, or the semi-hosting
                                  interface reported an error while performing the
                                  read operation.
  @retval  EFI_INVALID_PARAMETER  The parameter "This" or the parameter "Buffer"
                                  is NULL.
**/
EFI_STATUS
FileRead (
  IN     EFI_FILE  *This,
  IN OUT UINTN     *BufferSize,
  OUT    VOID      *Buffer
  );

/**
  Write data to an open file.

  @param[in]      This        A pointer to the EFI_FILE_PROTOCOL instance that
                              is the file handle to write data to.
  @param[in out]  BufferSize  On input, the size of the Buffer. On output, the
                              size of the data actually written. In both cases,
                              the size is measured in bytes.
  @param[in]      Buffer      The buffer of data to write.

  @retval  EFI_SUCCESS            The data was written.
  @retval  EFI_ACCESS_DENIED      Attempt to write into a read only file or
                                  in a file opened in read only mode.
  @retval  EFI_DEVICE_ERROR       The last issued semi-hosting operation failed.
  @retval  EFI_INVALID_PARAMETER  The parameter "This" or the parameter "Buffer"
                                  is NULL.

**/
EFI_STATUS
FileWrite (
  IN     EFI_FILE *This,
  IN OUT UINTN    *BufferSize,
  IN     VOID     *Buffer
  );

/**
  Return a file's current position.

  @param[in]   This      A pointer to the EFI_FILE_PROTOCOL instance that is
                         the file handle to get the current position on.
  @param[out]  Position  The address to return the file's current position value.

  @retval  EFI_SUCCESS            The position was returned.
  @retval  EFI_INVALID_PARAMETER  Position is a NULL pointer.

**/
EFI_STATUS
FileGetPosition (
  IN  EFI_FILE    *File,
  OUT UINT64      *Position
  );

/**
  Set a file's current position.

  @param[in]  This      A pointer to the EFI_FILE_PROTOCOL instance that is
                        the file handle to set the requested position on.
  @param[in]  Position  The byte position from the start of the file to set.

  @retval  EFI_SUCCESS       The position was set.
  @retval  EFI_DEVICE_ERROR  The semi-hosting positionning operation failed.
  @retval  EFI_UNSUPPORTED   The seek request for nonzero is not valid on open
                             directories.

**/
EFI_STATUS
FileSetPosition (
  IN EFI_FILE *File,
  IN UINT64   Position
  );

/**
  Return information about a file or a file system.

  @param[in]      This             A pointer to the EFI_FILE_PROTOCOL instance that
                                   is the file handle the requested information is for.
  @param[in]      InformationType  The type identifier for the information being requested :
                                   EFI_FILE_INFO_ID or EFI_FILE_SYSTEM_INFO_ID or
                                   EFI_FILE_SYSTEM_VOLUME_LABEL_ID
  @param[in out]  BufferSize       The size, in bytes, of Buffer.
  @param[out]     Buffer           A pointer to the data buffer to return. The type of the
                                   data inside the buffer is indicated by InformationType.

  @retval  EFI_SUCCESS           The information was returned.
  @retval  EFI_UNSUPPORTED       The InformationType is not known.
  @retval  EFI_BUFFER_TOO_SMALL  The BufferSize is too small to return the information.
                                 BufferSize has been updated with the size needed to
                                 complete the request.
  @retval  EFI_INVALID_PARAMETER  The parameter "This" or the parameter "Buffer"
                                  is NULL.

**/
EFI_STATUS
FileGetInfo (
  IN     EFI_FILE  *This,
  IN     EFI_GUID  *InformationType,
  IN OUT UINTN     *BufferSize,
  OUT    VOID      *Buffer
  );

/**
  Set information about a file or a file system.

  @param[in]  This             A pointer to the EFI_FILE_PROTOCOL instance that
                               is the file handle the information is for.
  @param[in]  InformationType  The type identifier for the information being set :
                               EFI_FILE_INFO_ID or EFI_FILE_SYSTEM_INFO_ID or
                               EFI_FILE_SYSTEM_VOLUME_LABEL_ID
  @param[in]  BufferSize       The size, in bytes, of Buffer.
  @param[in]  Buffer           A pointer to the data buffer to write. The type of the
                               data inside the buffer is indicated by InformationType.

  @retval  EFI_SUCCESS            The information was set.
  @retval  EFI_UNSUPPORTED        The InformationType is not known.
  @retval  EFI_DEVICE_ERROR       The last issued semi-hosting operation failed.
  @retval  EFI_ACCESS_DENIED      An attempt is being made to change the
                                  EFI_FILE_DIRECTORY Attribute.
  @retval  EFI_ACCESS_DENIED      InformationType is EFI_FILE_INFO_ID and
                                  the file is a read-only file or has been
                                  opened in read-only mode and an attempt is
                                  being made to modify a field other than
                                  Attribute.
  @retval  EFI_ACCESS_DENIED      An attempt is made to change the name of a file
                                  to a file that is already present.
  @retval  EFI_WRITE_PROTECTED    An attempt is being made to modify a
                                  read-only attribute.
  @retval  EFI_BAD_BUFFER_SIZE    The size of the buffer is lower than that indicated by
                                  the data inside the buffer.
  @retval  EFI_OUT_OF_RESOURCES   An allocation needed to process the request failed.
  @retval  EFI_INVALID_PARAMETER  At least one of the parameters is invalid.

**/
EFI_STATUS
FileSetInfo (
  IN EFI_FILE  *This,
  IN EFI_GUID  *InformationType,
  IN UINTN     BufferSize,
  IN VOID      *Buffer
  );

EFI_STATUS
FileFlush (
  IN EFI_FILE *File
  );

#endif // __SEMIHOST_FS_H__