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   Module Name:  SerialPortLibNull.c
  14
  15 **/
  16
  17 //
  18 // The package level header files this module uses
  19 //
  20 #include <FrameworkPei.h>
  21 //
  22 // The protocols, PPI and GUID defintions for this module
  23 //
  24 //
  25 // The Library classes this module consumes
  26 //
  27 #include <Library/SerialPortLib.h>
  28
  29 /*
  30
  31   Programmed hardware of Serial port.
  32
  33   @return    Always return EFI_UNSUPPORTED.
  34
  35 **/
  36 EFI_STATUS
  37 EFIAPI
  38 SerialPortInitialize (
  39   VOID
  40   )
  41 {
  42   return EFI_UNSUPPORTED;
  43 }
  44
  45 /**
  46   Write data to serial device.
  47
  48   @param  Buffer           Point of data buffer which need to be writed.
  49   @param  NumberOfBytes    Number of output bytes which are cached in Buffer.
  50
  51   @retval 0                Write data failed.
  52   @retval !0               Actual number of bytes writed to serial device.
  53
  54 **/
  55 UINTN
  56 EFIAPI
  57 SerialPortWrite (
  58   IN UINT8     *Buffer,
  59   IN UINTN     NumberOfBytes
  60 )
  61 {
  62   return 0;
  63 }
  64
  65
  66 /**
  67   Read data from serial device and save the datas in buffer.
  68
  69   @param  Buffer           Point of data buffer which need to be writed.
  70   @param  NumberOfBytes    Number of output bytes which are cached in Buffer.
  71
  72   @retval 0                Read data failed.
  73   @retval !0               Aactual number of bytes read from serial device.
  74
  75 **/
  76 UINTN
  77 EFIAPI
  78 SerialPortRead (
  79   OUT UINT8     *Buffer,
  80   IN  UINTN     NumberOfBytes
  81 )
  82 {
  83   return 0;
  84 }
  85