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 **/
  22 EFI_STATUS
  23 EFIAPI
  24 SerialPortInitialize (
  25   VOID
  26   )
  27 {
  28   return EFI_UNSUPPORTED;
  29 }
  30
  31 /**
  32   Write data to serial device.
  33
  34   If the buffer is NULL, then ASSERT();
  35   if NumberOfBytes is zero, then ASSERT().
  36
  37   @param  Buffer           Point of data buffer which need to be writed.
  38   @param  NumberOfBytes    Number of output bytes which are cached in Buffer.
  39
  40   @retval 0                Write data failed.
  41   @retval !0               Actual number of bytes writed to serial device.
  42
  43 **/
  44 UINTN
  45 EFIAPI
  46 SerialPortWrite (
  47   IN UINT8         *Buffer,
  48   IN UINTN         NumberOfBytes
  49 )
  50 {
  51   return 0;
  52 }
  53
  54
  55 /**
  56   Read data from serial device and save the datas in buffer.
  57
  58   If the buffer is NULL, then ASSERT();
  59   if NumberOfBytes is zero, then ASSERT().
  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