kernstream.hxx

C++ 编写的EROS RTOS

#ifndef __KERNSTREAM_HXX__
#define __KERNSTREAM_HXX__
/*
 * Copyright (C) 2001, Jonathan S. Shapiro.
 *
 * This file is part of the EROS Operating System.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2,
 * or (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

#include <kerninc/kernel.hxx>

/** KernStream is really an interface specification. The kernel
 * maintains three KernStreams: ConsoleStream, SerialStream,
 * LogStream. LogStream is global, and present in all
 * kernels. ConsoleStream is present if a console is
 * configured. SerialStream is present if the kernel debugger has been
 * configured for serial mode.
 *
 * Pointers to the ConsoleStream and SerialStream objects are in
 * turn conditionally assigned to two variables syscon_stream and
 * dbg_stream.
 */

struct ASCII {
  enum  {
    NUL = 0x00,
    SOH = 0x01,
    STX = 0x02,
    ETX = 0x03,
    EOT = 0x04,
    ENQ = 0x05,
    ACK = 0x06,
    BEL = 0x07,
    BS  = 0x08,
    TAB = 0x09,
    LF  = 0x0a,
    VT  = 0x0b,
    FF  = 0x0c,
    CR  = 0x0d,
    SO  = 0x0e,
    SI  = 0x0f,
    DLE = 0x10,
    DC1 = 0x11,
    DC2 = 0x12,
    DC3 = 0x13,
    DC4 = 0x14,
    NAK = 0x15,
    SYN = 0x16,
    ETB = 0x17,
    CAN = 0x18,
    EM  = 0x19,
    SUB = 0x1a,
    ESC = 0x1b,
    FS  = 0x1c,
    GS  = 0x1d,
    RS  = 0x1e,
    US  = 0x1f,
    SPC = 0x20,
    DEL = 0x7f,
  };
};

struct KernStream {
  virtual void Init() = 0;
  virtual void Put(uint8_t c) = 0;

#ifdef OPTION_DDB
  /* Following only called via dbg_stream */
  virtual uint8_t Get() = 0;
  virtual void SetDebugging(bool onoff) = 0;
  virtual void EnableDebuggerInput() = 0;
#endif

  /*** END OF MEMBERS -- REST IS JUST NAMESPACE TRICKERY ***/

#ifdef OPTION_DDB
  static bool debuggerIsActive;
#endif

  /* I would like to make these references, but the global constructor
   * code generator is screwing up the pointer initialization. */
  static KernStream* LogStream;
  static KernStream* ConsoleStream;
#ifdef OPTION_DDB_ON_TTY0
  static KernStream* SerialStream;
#endif


#ifdef OPTION_DDB
  static KernStream *dbg_stream;
#endif
  static KernStream *syscon_stream;
  static KernStream *log_stream;

  static bool IsPrint(uint8_t c);
  static void KernStream::InitStreams();

  static void PutBuf(uint8_t *s, uint32_t len);

  static void nl_putc(char c);
  static void do_putc(char c);

  static void BeginUserThreads();
};

#endif /* __KERNSTREAM_HXX__ */