Bochs/bochs/iodev/serial_raw.cc

/////////////////////////////////////////////////////////////////////////
// $Id: serial_raw.cc,v 1.14 2004-03-28 12:41:12 vruppert Exp $
/////////////////////////////////////////////////////////////////////////
//
//  Copyright (C) 2004  MandrakeSoft S.A.
//
//    MandrakeSoft S.A.
//    43, rue d'Aboukir
//    75002 Paris - France
//    http://www.linux-mandrake.com/
//    http://www.mandrakesoft.com/
//
//  This library is free software; you can redistribute it and/or
//  modify it under the terms of the GNU Lesser General Public
//  License as published by the Free Software Foundation; either
//  version 2 of the License, or (at your option) any later version.
//
//  This library is distributed in the hope that it will be useful,
//  but WITHOUT ANY WARRANTY; without even the implied warranty of
//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
//  Lesser General Public License for more details.
//
//  You should have received a copy of the GNU Lesser General Public
//  License along with this library; if not, write to the Free Software
//  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
//

// Define BX_PLUGGABLE in files that can be compiled into plugins.  For
// platforms that require a special tag on exported symbols, BX_PLUGGABLE 
// is used to know when we are exporting symbols and when we are importing.
#define BX_PLUGGABLE

#include "bochs.h"

#if USE_RAW_SERIAL

#define LOG_THIS

serial_raw::serial_raw (char *devname)
{
#ifdef WIN32
  char portstr[MAX_PATH];
#endif

  put ("SERR");
  settype (SERRLOG);
#ifdef WIN32
  memset(&dcb, 0, sizeof(DCB));
  dcb.DCBlength = sizeof(DCB);
  dcb.fBinary = 1;
  dcb.fDtrControl = DTR_CONTROL_ENABLE;
  dcb.fRtsControl = RTS_CONTROL_ENABLE;
  DCBchanged = FALSE;
  if (lstrlen(devname) > 0) {
    wsprintf(portstr, "\\\\.\\%s", devname);
    hCOM = CreateFile(portstr, GENERIC_READ|GENERIC_WRITE, 0, NULL,
                      OPEN_EXISTING, FILE_FLAG_OVERLAPPED, NULL);
    if (hCOM != INVALID_HANDLE_VALUE) {
      present = 1;
    } else {
      present = 0;
      BX_ERROR(("Raw device '%s' not present", devname));
    }
  } else {
    present = 0;
  }
#else
  present = 0;
#endif
  set_modem_control(0x00);
  set_break(0);
  rxdata_count = 0;
}

serial_raw::~serial_raw (void)
{
  if (present) {
#ifdef WIN32
    CloseHandle(hCOM);
#endif
  }
}

void 
serial_raw::set_baudrate (int rate)
{
  BX_DEBUG (("set_baudrate %d", rate));
#ifdef WIN32
  switch (rate) {
    case 110: dcb.BaudRate = CBR_110; break;
    case 300: dcb.BaudRate = CBR_300; break;
    case 600: dcb.BaudRate = CBR_600; break;
    case 1200: dcb.BaudRate = CBR_1200; break;
    case 2400: dcb.BaudRate = CBR_2400; break;
    case 4800: dcb.BaudRate = CBR_4800; break;
    case 9600: dcb.BaudRate = CBR_9600; break;
    case 19200: dcb.BaudRate = CBR_19200; break;
    case 38400: dcb.BaudRate = CBR_38400; break;
    case 57600: dcb.BaudRate = CBR_57600; break;
    case 115200: dcb.BaudRate = CBR_115200; break;
    default: BX_ERROR(("set_baudrate(): unsupported value %d", rate));
  }
  DCBchanged = TRUE;
#endif
}

void 
serial_raw::set_data_bits (int val)
{
  BX_DEBUG (("set data bits (%d)", val));
#ifdef WIN32
  dcb.ByteSize = val;
  DCBchanged = TRUE;
#endif
}

void 
serial_raw::set_stop_bits (int val)
{
  BX_DEBUG (("set stop bits (%d)", val));
#ifdef WIN32
  if (val == 1) {
    dcb.StopBits = ONESTOPBIT;
  } if (dcb.ByteSize == 5) {
    dcb.StopBits = ONE5STOPBITS;
  } else {
    dcb.StopBits = TWOSTOPBITS;
  }
  DCBchanged = TRUE;
#endif
}

void 
serial_raw::set_parity_mode (int mode)
{
  BX_DEBUG (("set parity mode %d", mode));
#ifdef WIN32
  switch (mode) {
    case 0:
      dcb.fParity = FALSE;
      dcb.Parity = NOPARITY;
      break;
    case 1:
      dcb.fParity = TRUE;
      dcb.Parity = ODDPARITY;
      break;
    case 2:
      dcb.fParity = TRUE;
      dcb.Parity = EVENPARITY;
      break;
    case 3:
      dcb.fParity = TRUE;
      dcb.Parity = MARKPARITY;
      break;
    case 4:
      dcb.fParity = TRUE;
      dcb.Parity = SPACEPARITY;
      break;
  }
  DCBchanged = TRUE;
#endif
}

void 
serial_raw::set_break (int mode)
{
  BX_DEBUG (("set break %s", mode?"on":"off"));
#ifdef WIN32
  if (mode) {
    SetCommBreak(hCOM);
  } else {
    ClearCommBreak(hCOM);
  }
#endif
}

void 
serial_raw::set_modem_control (int ctrl)
{
  BX_DEBUG (("set modem control 0x%02x", ctrl));
#ifdef WIN32
  EscapeCommFunction(hCOM, (ctrl & 0x01)?SETDTR:CLRDTR);
  EscapeCommFunction(hCOM, (ctrl & 0x02)?SETRTS:CLRRTS);
#endif
}

int 
serial_raw::get_modem_status ()
{
#ifdef WIN32
  DWORD mstat;
#endif
  int status = 0;

#ifdef WIN32
  GetCommModemStatus(hCOM, &mstat);
  status = mstat & 0xf0;
#endif
  BX_DEBUG (("get modem status returns 0x%02x", status));
  return status;
}

void 
serial_raw::setup_port ()
{
#ifdef WIN32
  DWORD DErr;
  COMMTIMEOUTS ctmo;

  ClearCommError(hCOM, &DErr, NULL);
  SetupComm(hCOM, 2048, 2048);
  PurgeComm(hCOM, PURGE_TXABORT | PURGE_RXABORT |
            PURGE_TXCLEAR | PURGE_RXCLEAR);
  memset(&ctmo, 0, sizeof(ctmo));
  SetCommTimeouts(hCOM, &ctmo);
  SetCommState(hCOM, &dcb);
  SetCommMask(hCOM, 0);
#endif
}

void 
serial_raw::transmit (Bit8u byte)
{
#ifdef WIN32
  DWORD DErr, Len2;
  OVERLAPPED tx_ovl;
#endif

  BX_DEBUG (("transmit %d", byte));
  if (present) {
#ifdef WIN32
    if (DCBchanged) {
      setup_port();
    } else {
      ClearCommError(hCOM, &DErr, NULL);
    }
    memset(&tx_ovl, 0, sizeof(OVERLAPPED));
    tx_ovl.hEvent = CreateEvent(NULL,TRUE,TRUE,"transmit");
    if (!WriteFile(hCOM, &byte, 1, &Len2, &tx_ovl)) {
      if (GetLastError() == ERROR_IO_PENDING) {
        if (WaitForSingleObject(tx_ovl.hEvent, 100) == WAIT_OBJECT_0) {
          GetOverlappedResult(hCOM, &tx_ovl, &Len2, FALSE);
        }
      }
    }
    if (Len2 != 1) BX_ERROR(("transmit failed: len = %d", Len2));
    ClearCommError(hCOM, &DErr, NULL);
    CloseHandle(tx_ovl.hEvent);
#endif
  }
}

bx_bool 
serial_raw::ready_transmit ()
{
  BX_DEBUG (("ready_transmit returning %d", present));
  return present;
}

bx_bool 
serial_raw::ready_receive ()
{
  BX_DEBUG (("ready_receive returning %d", (rxdata_count > 0)));
  return (rxdata_count > 0);
}

int 
serial_raw::receive ()
{
  BX_DEBUG (("receive returning 'A'"));
  if (present) {
#ifdef WIN32
    if (DCBchanged) {
      setup_port();
    }
#endif
    return (int)'A';
  } else {
    return (int)'A';
  }
}

#endif