Subversion Repositories HelenOS-historic

Rev

Rev 509 | Go to most recent revision | Blame | Last modification | View Log | Download | RSS feed

  1. /*
  2.  * Copyright (C) 2003 Josef Cejka
  3.  * Copyright (C) 2005 Jakub Jermar
  4.  * All rights reserved.
  5.  *
  6.  * Redistribution and use in source and binary forms, with or without
  7.  * modification, are permitted provided that the following conditions
  8.  * are met:
  9.  *
  10.  * - Redistributions of source code must retain the above copyright
  11.  *   notice, this list of conditions and the following disclaimer.
  12.  * - Redistributions in binary form must reproduce the above copyright
  13.  *   notice, this list of conditions and the following disclaimer in the
  14.  *   documentation and/or other materials provided with the distribution.
  15.  * - The name of the author may not be used to endorse or promote products
  16.  *   derived from this software without specific prior written permission.
  17.  *
  18.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  19.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  20.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  21.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  22.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  23.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  24.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  25.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  26.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  27.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  28.  */
  29.  
  30. #include <arch/drivers/keyboard.h>
  31. #include <console/chardev.h>
  32. #include <console/console.h>
  33. #include <arch/cp0.h>
  34. #include <putchar.h>
  35. #include <synch/spinlock.h>
  36. #include <synch/waitq.h>
  37. #include <typedefs.h>
  38.  
  39. static chardev_t kbrd;
  40.  
  41. static void keyboard_enable(void);
  42.  
  43. /** Initialize keyboard subsystem. */
  44. void keyboard_init(void)
  45. {
  46.     cp0_unmask_int(KEYBOARD_IRQ);
  47.     chardev_initialize(&kbrd, keyboard_enable);
  48.     stdin = &kbrd;
  49. }
  50.  
  51. /** Process keyboard interrupt.
  52.  *
  53.  * This function is called directly from the interrupt handler.
  54.  * It feeds the keyboard buffer with characters read. When the buffer
  55.  * is full, it simply masks the keyboard interrupt signal.
  56.  */
  57. void keyboard(void)
  58. {
  59.     char ch;
  60.  
  61.     spinlock_lock(&kbrd.lock);
  62.     kbrd.counter++;
  63.     if (kbrd.counter == CHARDEV_BUFLEN - 1) {
  64.             /* buffer full => disable keyboard interrupt */
  65.         cp0_mask_int(KEYBOARD_IRQ);
  66.     }
  67.  
  68.     ch = *((char *) KEYBOARD_ADDRESS);
  69.     putchar(ch);
  70.     kbrd.buffer[kbrd.index++] = ch;
  71.     kbrd.index = kbrd.index % CHARDEV_BUFLEN; /* index modulo size of buffer */
  72.     waitq_wakeup(&kbrd.wq, WAKEUP_FIRST);
  73.     spinlock_unlock(&kbrd.lock);
  74. }
  75.  
  76. /* Called from getc(). */
  77. void keyboard_enable(void)
  78. {
  79.     cp0_unmask_int(KEYBOARD_IRQ);
  80. }
  81.