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  1. /*
  2.  * Copyright (C) 2005 Ondrej Palkovsky
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. #include <interrupt.h>
  30. #include <console/chardev.h>
  31. #include <arch/drivers/msim.h>
  32. #include <arch/cp0.h>
  33.  
  34. static chardev_t console;
  35.  
  36. static void msim_write(chardev_t *dev, const char ch);
  37. static void msim_enable(chardev_t *dev);
  38. static void msim_disable(chardev_t *dev);
  39.  
  40. static chardev_operations_t msim_ops = {
  41.     .resume = msim_enable,
  42.     .suspend = msim_disable,
  43.     .write = msim_write
  44. };
  45.  
  46. /** Putchar that works with MSIM & gxemul */
  47. void msim_write(chardev_t *dev, const char ch)
  48. {
  49.     *((char *) MSIM_VIDEORAM) = ch;
  50. }
  51.  
  52. /* Called from getc(). */
  53. void msim_enable(chardev_t *dev)
  54. {
  55.     cp0_unmask_int(MSIM_KBD_IRQ);
  56. }
  57.  
  58. /* Called from getc(). */
  59. void msim_disable(chardev_t *dev)
  60. {
  61.     cp0_mask_int(MSIM_KBD_IRQ);
  62. }
  63.  
  64. /** Process keyboard interrupt. */
  65. static void msim_interrupt(int n, void *stack)
  66. {
  67.     char ch;
  68.  
  69.     ch = *((char *) MSIM_KBD_ADDRESS);
  70.     if (ch =='\r')
  71.         ch = '\n';
  72.     chardev_push_character(&console, ch);
  73. }
  74.  
  75.  
  76. /* Return console object representing msim console */
  77. chardev_t * msim_console(void)
  78. {
  79.     chardev_initialize("msim_console", &console, &msim_ops);
  80.  
  81.     exc_register(MSIM_KBD_IRQ, "msim_kbd", msim_interrupt);
  82.  
  83.     cp0_unmask_int(MSIM_KBD_IRQ);
  84.  
  85.     return &console;
  86. }
  87.