text: /////////////////////////////////////////////////////////////////////////
  // $Id: biosdev.cc 11058 2012-02-23 17:16:35Z vruppert $
  /////////////////////////////////////////////////////////////////////////
  //
  //  Copyright (C) 2002-2009  The Bochs Project
  //
  //  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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
  
  
  // Here are the virtual ports use to display messages from the bioses :
  //
  //  0x0400 : rombios Panic port with line number
  //  0x0401 : rombios Panic port with message, panic flag or line number
  //  0x0402 : rombios Info port with message
  //  0x0403 : rombios Debug port with message
  //
  //  0x0500 : vgabios Info port with message
  //  0x0501 : vgabios Panic port with line number
  //  0x0502 : vgabios Panic port with message, panic flag or line number
  //  0x0503 : vgabios Debug port with message
  
  
  // 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 "iodev.h"
  #include "biosdev.h"
  
  bx_biosdev_c *theBiosDevice = NULL;
  
  logfunctions  *bioslog;
  logfunctions  *vgabioslog;
  
  int libbiosdev_LTX_plugin_init(plugin_t *plugin, plugintype_t type, int argc, char *argv[])
  {
    theBiosDevice = new bx_biosdev_c();
    BX_REGISTER_DEVICE_DEVMODEL(plugin, type, theBiosDevice, BX_PLUGIN_BIOSDEV);
    return(0); // Success
  }
  
  void libbiosdev_LTX_plugin_fini(void)
  {
    delete theBiosDevice;
  }
  
  bx_biosdev_c::bx_biosdev_c(void)
  {
    memset(&s, 0, sizeof(s));
  
    bioslog = new logfunctions();
    bioslog->put("BIOS");
  
    vgabioslog = new logfunctions();
    vgabioslog->put("vgabios", "VBIOS");
  }
  
  bx_biosdev_c::~bx_biosdev_c(void)
  {
    bioslog->ldebug("Exit");
    if (bioslog != NULL) {
      delete bioslog;
      bioslog = NULL;
    }
    if (vgabioslog != NULL) {
      delete vgabioslog;
      vgabioslog = NULL;
    }
  }
  
  void bx_biosdev_c::init(void)
  {
    DEV_register_iowrite_handler(this, write_handler, 0x0400, "Bios Panic Port 1", 3);
    DEV_register_iowrite_handler(this, write_handler, 0x0401, "Bios Panic Port 2", 3);
    DEV_register_iowrite_handler(this, write_handler, 0x0402, "Bios Info Port", 1);
    DEV_register_iowrite_handler(this, write_handler, 0x0403, "Bios Debug Port", 1);
  
    DEV_register_iowrite_handler(this, write_handler, 0x0500, "VGABios Info Port", 1);
    DEV_register_iowrite_handler(this, write_handler, 0x0501, "VGABios Panic Port 1", 3);
    DEV_register_iowrite_handler(this, write_handler, 0x0502, "VGABios Panic Port 2", 3);
    DEV_register_iowrite_handler(this, write_handler, 0x0503, "VGABios Debug Port", 1);
  }
  
    // static IO port write callback handler
    // redirects to non-static class handler to avoid virtual functions
  
  void bx_biosdev_c::write_handler(void *this_ptr, Bit32u address, Bit32u value, unsigned io_len)
  {
  #if !BX_USE_BIOS_SMF
    bx_biosdev_c *class_ptr = (bx_biosdev_c *) this_ptr;
  
    class_ptr->write(address, value, io_len);
  }
  
  void bx_biosdev_c::write(Bit32u address, Bit32u value, unsigned io_len)
  {
  #else
    UNUSED(this_ptr);
  #endif  // !BX_USE_BIOS_SMF
    UNUSED(io_len);
  
  
    switch (address) {
      // 0x400-0x401 are used as panic ports for the rombios
      case 0x0401:
        if (value==0) {
          // The next message sent to the info port will cause a panic
          BX_BIOS_THIS s.bios_panic_flag = 1;
          break;
        } else if (BX_BIOS_THIS s.bios_message_i > 0) {
          // if there are bits of message in the buffer, print them as the
          // panic message.  Otherwise fall into the next case.
          if (BX_BIOS_THIS s.bios_message_i >= BX_BIOS_MESSAGE_SIZE)
            BX_BIOS_THIS s.bios_message_i = BX_BIOS_MESSAGE_SIZE-1;
          BX_BIOS_THIS s.bios_message[ BX_BIOS_THIS s.bios_message_i] = 0;
          BX_BIOS_THIS s.bios_message_i = 0;
          bioslog->panic("%s", BX_BIOS_THIS s.bios_message);
          break;
        }
      case 0x0400:
        if (value > 0) {
          bioslog->panic("BIOS panic at rombios.c, line %d", value);
        }
        break;
  
      // 0x0402 is used as the info port for the rombios
      // 0x0403 is used as the debug port for the rombios
      case 0x0402:
      case 0x0403:
        BX_BIOS_THIS s.bios_message[BX_BIOS_THIS s.bios_message_i] =
          (Bit8u) value;
        BX_BIOS_THIS s.bios_message_i ++;
        if (BX_BIOS_THIS s.bios_message_i >= BX_BIOS_MESSAGE_SIZE) {
          BX_BIOS_THIS s.bios_message[ BX_BIOS_MESSAGE_SIZE - 1] = 0;
          BX_BIOS_THIS s.bios_message_i = 0;
          if (address==0x403)
            bioslog->ldebug("%s", BX_BIOS_THIS s.bios_message);
          else
            bioslog->info("%s", BX_BIOS_THIS s.bios_message);
        } else if ((value & 0xff) == '\n') {
          BX_BIOS_THIS s.bios_message[ BX_BIOS_THIS s.bios_message_i - 1 ] = 0;
          BX_BIOS_THIS s.bios_message_i = 0;
          if (BX_BIOS_THIS s.bios_panic_flag==1)
            bioslog->panic("%s", BX_BIOS_THIS s.bios_message);
          else if (address==0x403)
            bioslog->ldebug("%s", BX_BIOS_THIS s.bios_message);
          else
            bioslog->info("%s", BX_BIOS_THIS s.bios_message);
          BX_BIOS_THIS s.bios_panic_flag = 0;
        }
        break;
  
      // 0x501-0x502 are used as panic ports for the vgabios
      case 0x0502:
        if (value==0) {
          BX_BIOS_THIS s.vgabios_panic_flag = 1;
          break;
        } else if (BX_BIOS_THIS s.vgabios_message_i > 0) {
          // if there are bits of message in the buffer, print them as the
          // panic message.  Otherwise fall into the next case.
          if (BX_BIOS_THIS s.vgabios_message_i >= BX_BIOS_MESSAGE_SIZE)
            BX_BIOS_THIS s.vgabios_message_i = BX_BIOS_MESSAGE_SIZE-1;
          BX_BIOS_THIS s.vgabios_message[ BX_BIOS_THIS s.vgabios_message_i] = 0;
          BX_BIOS_THIS s.vgabios_message_i = 0;
          vgabioslog->panic("%s", BX_BIOS_THIS s.vgabios_message);
          break;
        }
      case 0x0501:
        if (value > 0) {
          vgabioslog->panic("VGABIOS panic at vgabios.c, line %d", value);
        }
        break;
  
      // 0x0500 is used as the message port for the vgabios
      case 0x0500:
      case 0x0503:
        BX_BIOS_THIS s.vgabios_message[BX_BIOS_THIS s.vgabios_message_i] =
          (Bit8u) value;
        BX_BIOS_THIS s.vgabios_message_i ++;
        if (BX_BIOS_THIS s.vgabios_message_i >= BX_BIOS_MESSAGE_SIZE) {
          BX_BIOS_THIS s.vgabios_message[ BX_BIOS_MESSAGE_SIZE - 1] = 0;
          BX_BIOS_THIS s.vgabios_message_i = 0;
          if (address==0x503)
            vgabioslog->ldebug("%s", BX_BIOS_THIS s.vgabios_message);
          else
            vgabioslog->info("%s", BX_BIOS_THIS s.vgabios_message);
        } else if ((value & 0xff) == '\n') {
          BX_BIOS_THIS s.vgabios_message[ BX_BIOS_THIS s.vgabios_message_i - 1 ] = 0;
          BX_BIOS_THIS s.vgabios_message_i = 0;
          if (BX_BIOS_THIS s.vgabios_panic_flag==1)
            vgabioslog->panic("%s", BX_BIOS_THIS s.vgabios_message);
          else if (address==0x503)
            vgabioslog->ldebug("%s", BX_BIOS_THIS s.vgabios_message);
          else
            vgabioslog->info("%s", BX_BIOS_THIS s.vgabios_message);
          BX_BIOS_THIS s.vgabios_panic_flag = 0;
        }
        break;
  
      default:
        break;
    }
  }
  