EdkModulePkg/Library/EdkSerialPortLibNull/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
  19   Programmed hardware of Serial port.
  20
  21   @return    Always return EFI_UNSUPPORTED.
  22
  23 **/
  24 EFI_STATUS
  25 EFIAPI
  26 SerialPortInitialize (
  27   VOID
  28   )
  29 {
  30   return EFI_UNSUPPORTED;
  31 }
  32
  33 /**
  34   Write data to serial device.
  35
  36   @param  Buffer           Point of data buffer which need to be writed.
  37   @param  NumberOfBytes    Number of output bytes which are cached in Buffer.
  38
  39   @retval 0                Write data failed.
  40   @retval !0               Actual number of bytes writed to serial device.
  41
  42 **/
  43 UINTN
  44 EFIAPI
  45 SerialPortWrite (
  46   IN UINT8     *Buffer,
  47   IN UINTN     NumberOfBytes
  48 )
  49 {
  50   return 0;
  51 }
  52
  53
  54 /**
  55   Read data from serial device and save the datas in buffer.
  56
  57   @param  Buffer           Point of data buffer which need to be writed.
  58   @param  NumberOfBytes    Number of output bytes which are cached in Buffer.
  59
  60   @retval 0                Read data failed.
  61   @retval !0               Aactual number of bytes read from serial device.
  62
  63 **/
  64 UINTN
  65 EFIAPI
  66 SerialPortRead (
  67   OUT UINT8     *Buffer,
  68   IN  UINTN     NumberOfBytes
  69 )
  70 {
  71   return 0;
  72 }
  73