MdePkg/Library/SerialPortLibNull/SerialPortLibNull.c

   1 /** @file
   2   Serial I/O Port library functions with no library constructor/destructor
   3
   4   Copyright (c) 2006, Intel Corporation
   5   All rights reserved. This program and the accompanying materials
   6   are licensed and made available under the terms and conditions of the BSD License
   7   which accompanies this distribution.  The full text of the license may be found at
   8   http://opensource.org/licenses/bsd-license.php
   9
  10   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  11   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  12
  13 **/
  14
  15
  16 #include <Base.h>
  17
  18
  19 #include <Library/SerialPortLib.h>
  20
  21 /*
  22
  23   Programmed hardware of Serial port.
  24
  25   @return    Always return EFI_UNSUPPORTED.
  26
  27 **/
  28 RETURN_STATUS
  29 EFIAPI
  30 SerialPortInitialize (
  31   VOID
  32   )
  33 {
  34   return RETURN_UNSUPPORTED;
  35 }
  36
  37 /**
  38   Write data to serial device.
  39
  40   @param  Buffer           Point of data buffer which need to be writed.
  41   @param  NumberOfBytes    Number of output bytes which are cached in Buffer.
  42
  43   @retval 0                Write data failed.
  44   @retval !0               Actual number of bytes writed to serial device.
  45
  46 **/
  47 UINTN
  48 EFIAPI
  49 SerialPortWrite (
  50   IN UINT8     *Buffer,
  51   IN UINTN     NumberOfBytes
  52 )
  53 {
  54   return 0;
  55 }
  56
  57
  58 /**
  59   Read data from serial device and save the datas in buffer.
  60
  61   @param  Buffer           Point of data buffer which need to be writed.
  62   @param  NumberOfBytes    Number of output bytes which are cached in Buffer.
  63
  64   @retval 0                Read data failed.
  65   @retval !0               Aactual number of bytes read from serial device.
  66
  67 **/
  68 UINTN
  69 EFIAPI
  70 SerialPortRead (
  71   OUT UINT8     *Buffer,
  72   IN  UINTN     NumberOfBytes
  73 )
  74 {
  75   return 0;
  76 }
  77