Add header file for KMS.

[mirror_edk2.git] / ArmPkg / Library / SemiHostingSerialPortLib / SerialPortLib.c

/** @file\r
  Serial I/O Port library functions with no library constructor/destructor\r
\r
  Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>\r
  \r
  This program and the accompanying materials\r
  are licensed and made available under the terms and conditions of the BSD License\r
  which accompanies this distribution.  The full text of the license may be found at\r
  http://opensource.org/licenses/bsd-license.php\r
\r
  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
\r
**/\r
\r
#include <Uefi.h>\r
#include <Library/DebugLib.h>\r
#include <Library/SemihostLib.h>\r
#include <Library/SerialPortLib.h>\r
\r
\r
/*\r
\r
  Programmed hardware of Serial port.\r
\r
  @return    Always return EFI_UNSUPPORTED.\r
\r
**/\r
RETURN_STATUS\r
EFIAPI\r
SerialPortInitialize (\r
  VOID\r
  )\r
{\r
  if (SemihostConnectionSupported ()) {\r
    return RETURN_SUCCESS;\r
  } else {\r
    return RETURN_UNSUPPORTED;\r
  }\r
}\r
\r
/**\r
  Write data to serial device.\r
\r
  @param  Buffer           Point of data buffer which need to be writed.\r
  @param  NumberOfBytes    Number of output bytes which are cached in Buffer.\r
\r
  @retval 0                Write data failed.\r
  @retval !0               Actual number of bytes writed to serial device.\r
\r
**/\r
\r
#define PRINT_BUFFER_SIZE       512\r
#define PRINT_BUFFER_THRESHOLD  (PRINT_BUFFER_SIZE - 4)\r
\r
UINTN\r
EFIAPI\r
SerialPortWrite (\r
  IN UINT8     *Buffer,\r
  IN UINTN     NumberOfBytes\r
)\r
{\r
  UINT8 PrintBuffer[PRINT_BUFFER_SIZE];\r
  UINTN SourceIndex      = 0;\r
  UINTN DestinationIndex = 0;\r
  UINT8 CurrentCharacter;\r
\r
  while (SourceIndex < NumberOfBytes)\r
  {\r
      CurrentCharacter = Buffer[SourceIndex++];\r
      \r
      switch (CurrentCharacter)\r
      {\r
      case '\r':\r
          continue;\r
\r
      case '\n':\r
          PrintBuffer[DestinationIndex++] = ' ';\r
          // fall through\r
\r
      default:\r
          PrintBuffer[DestinationIndex++] = CurrentCharacter;\r
          break;\r
      }\r
\r
      if (DestinationIndex > PRINT_BUFFER_THRESHOLD)\r
      {\r
          PrintBuffer[DestinationIndex] = '\0';\r
          SemihostWriteString ((CHAR8 *) PrintBuffer);\r
\r
          DestinationIndex = 0;\r
      }\r
  }\r
  \r
  if (DestinationIndex > 0)\r
  {\r
      PrintBuffer[DestinationIndex] = '\0';\r
      SemihostWriteString ((CHAR8 *) PrintBuffer);\r
  }\r
\r
  return 0;\r
}\r
\r
\r
/**\r
  Read data from serial device and save the datas in buffer.\r
\r
  @param  Buffer           Point of data buffer which need to be writed.\r
  @param  NumberOfBytes    Number of output bytes which are cached in Buffer.\r
\r
  @retval 0                Read data failed.\r
  @retval !0               Aactual number of bytes read from serial device.\r
\r
**/\r
UINTN\r
EFIAPI\r
SerialPortRead (\r
  OUT UINT8     *Buffer,\r
  IN  UINTN     NumberOfBytes\r
)\r
{\r
  *Buffer = SemihostReadCharacter ();\r
  return 1;\r
}\r
\r
\r
\r
/**\r
  Check to see if any data is avaiable to be read from the debug device.\r
\r
  @retval TRUE       At least one byte of data is avaiable to be read\r
  @retval FALSE      No data is avaiable to be read\r
\r
**/\r
BOOLEAN\r
EFIAPI\r
SerialPortPoll (\r
  VOID\r
  )\r
{\r
  // Since SemiHosting read character is blocking always say we have a char ready?\r
  return SemihostConnectionSupported ();\r
}\r
\r