services/early_logger.cpp

   1 /* Quarn OS
   2  *
   3  * Early logger
   4  *
   5  * Copyright (C) 2008-2009 Pawel Dziepak
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License along
  18  * with this program; if not, write to the Free Software Foundation, Inc.,
  19  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  */
  22
  23 /* Implementation of a logger that can be used immediately after booting kernel.
  24  * It does not uses any high-level kernel structures and objects, so it can be
  25  * a good way to inform about their corruption. However it is not reccomended
  26  * to use it after setting up "standard" tty logger.
  27  */
  28
  29 #include "early_logger.h"
  30
  31 #include "server.h"
  32 #include "manes/cds/creator.h"
  33 #include "manes/cds/type.h"
  34 #include "manes/manec.h"
  35
  36 #include "libs/colors.h"
  37
  38 using namespace manes;
  39 using namespace manes::cds;
  40 using namespace services;
  41
  42
  43 early_logger::early_logger() {
  44         output = manec::get()->get<resources::stream>("/console");
  45 }
  46
  47 /* Print a log message. This logger prints everything on the screen regardless
  48  * of its level. At the stage when it is used, all information is imported.
  49  */
  50 void early_logger::print(const string &message, log_level) {
  51         assert("early_logger: empty message provided", message.null());
  52
  53         bool accept_colors = output.is<color_output>();
  54         if (accept_colors)
  55                 output.cast<color_output>()->set_forecolor(color::white);
  56         output->write(message.to_mem());
  57         if (accept_colors)
  58                 output.cast<color_output>()->default_color();
  59 }
  60
  61 void early_logger::register_type() {
  62         manec::get()->register_type<early_logger>("early_logger", "service");
  63 }
  64