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  1. /*
  2.  * Copyright (C) 2001-2004 Jakub Jermar
  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 <arch/i8042.h>
  30. #include <arch/i8259.h>
  31. #include <arch/interrupt.h>
  32. #include <cpu.h>
  33. #include <arch/asm.h>
  34. #include <arch.h>
  35. #include <print.h>
  36. #include <synch/spinlock.h>
  37. #include <typedefs.h>
  38.  
  39. /**
  40.  * i8042 processor driver.
  41.  * It takes care of low-level keyboard functions.
  42.  */
  43.  
  44. #define SPECIAL     '?'
  45. #define KEY_RELEASE 0x80
  46.  
  47. static void key_released(__u8 sc);
  48. static void key_pressed(__u8 sc);
  49.  
  50. #define PRESSED_SHIFT       (1<<0)
  51. #define PRESSED_CAPSLOCK    (1<<1)
  52. #define LOCKED_CAPSLOCK     (1<<0)
  53.  
  54. static spinlock_t keylock;  /**< keylock protects keyflags and lockflags. */
  55. static volatile int keyflags;       /**< Tracking of multiple keypresses. */
  56. static volatile int lockflags;      /**< Tracking of multiple lock keys keypresses. */
  57.  
  58. /** Primary meaning of scancodes. */
  59. static char sc_primary_map[] = {
  60.     SPECIAL, /* 0x00 */
  61.     SPECIAL, /* 0x01 - Esc */
  62.     '1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '-', '=',
  63.     SPECIAL, /* 0x0e - Backspace */
  64.     '\t', 'q', 'w', 'e', 'r', 't', 'y', 'u', 'i', 'o', 'p', '[', ']', '\n',
  65.     SPECIAL, /* 0x1d - LCtrl */
  66.     'a', 's', 'd', 'f', 'g', 'h', 'j', 'k', 'l', ';', '\'',
  67.     '`',
  68.     SPECIAL, /* 0x2a - LShift */
  69.     '\\',
  70.     'z', 'x', 'c', 'v', 'b', 'n', 'm', ',', '.', '/',
  71.     SPECIAL, /* 0x36 - RShift */
  72.     '*',
  73.     SPECIAL, /* 0x38 - LAlt */
  74.     ' ',
  75.     SPECIAL, /* 0x3a - CapsLock */
  76.     SPECIAL, /* 0x3b - F1 */
  77.     SPECIAL, /* 0x3c - F2 */
  78.     SPECIAL, /* 0x3d - F3 */
  79.     SPECIAL, /* 0x3e - F4 */
  80.     SPECIAL, /* 0x3f - F5 */
  81.     SPECIAL, /* 0x40 - F6 */
  82.     SPECIAL, /* 0x41 - F7 */
  83.     SPECIAL, /* 0x42 - F8 */
  84.     SPECIAL, /* 0x43 - F9 */
  85.     SPECIAL, /* 0x44 - F10 */
  86.     SPECIAL, /* 0x45 - NumLock */
  87.     SPECIAL, /* 0x46 - ScrollLock */
  88.     '7', '8', '9', '-',
  89.     '4', '5', '6', '+',
  90.     '1', '2', '3',
  91.     '0', '.',
  92.     SPECIAL, /* 0x54 - Alt-SysRq */
  93.     SPECIAL, /* 0x55 - F11/F12/PF1/FN */
  94.     SPECIAL, /* 0x56 - unlabelled key next to LAlt */
  95.     SPECIAL, /* 0x57 - F11 */
  96.     SPECIAL, /* 0x58 - F12 */
  97.     SPECIAL, /* 0x59 */
  98.     SPECIAL, /* 0x5a */
  99.     SPECIAL, /* 0x5b */
  100.     SPECIAL, /* 0x5c */
  101.     SPECIAL, /* 0x5d */
  102.     SPECIAL, /* 0x5e */
  103.     SPECIAL, /* 0x5f */
  104.     SPECIAL, /* 0x60 */
  105.     SPECIAL, /* 0x61 */
  106.     SPECIAL, /* 0x62 */
  107.     SPECIAL, /* 0x63 */
  108.     SPECIAL, /* 0x64 */
  109.     SPECIAL, /* 0x65 */
  110.     SPECIAL, /* 0x66 */
  111.     SPECIAL, /* 0x67 */
  112.     SPECIAL, /* 0x68 */
  113.     SPECIAL, /* 0x69 */
  114.     SPECIAL, /* 0x6a */
  115.     SPECIAL, /* 0x6b */
  116.     SPECIAL, /* 0x6c */
  117.     SPECIAL, /* 0x6d */
  118.     SPECIAL, /* 0x6e */
  119.     SPECIAL, /* 0x6f */
  120.     SPECIAL, /* 0x70 */
  121.     SPECIAL, /* 0x71 */
  122.     SPECIAL, /* 0x72 */
  123.     SPECIAL, /* 0x73 */
  124.     SPECIAL, /* 0x74 */
  125.     SPECIAL, /* 0x75 */
  126.     SPECIAL, /* 0x76 */
  127.     SPECIAL, /* 0x77 */
  128.     SPECIAL, /* 0x78 */
  129.     SPECIAL, /* 0x79 */
  130.     SPECIAL, /* 0x7a */
  131.     SPECIAL, /* 0x7b */
  132.     SPECIAL, /* 0x7c */
  133.     SPECIAL, /* 0x7d */
  134.     SPECIAL, /* 0x7e */
  135.     SPECIAL, /* 0x7f */
  136. };
  137.  
  138. /** Secondary meaning of scancodes. */
  139. static char sc_secondary_map[] = {
  140.     SPECIAL, /* 0x00 */
  141.     SPECIAL, /* 0x01 - Esc */
  142.     '!', '@', '#', '$', '%', '^', '&', '*', '(', ')', '_', '+',
  143.     SPECIAL, /* 0x0e - Backspace */
  144.     '\t', 'Q', 'W', 'E', 'R', 'T', 'Y', 'U', 'I', 'O', 'P', '{', '}', '\n',
  145.     SPECIAL, /* 0x1d - LCtrl */
  146.     'A', 'S', 'D', 'F', 'G', 'H', 'J', 'K', 'L', ':', '"',
  147.     '~',
  148.     SPECIAL, /* 0x2a - LShift */
  149.     '|',
  150.     'Z', 'X', 'C', 'V', 'B', 'N', 'M', '<', '>', '?',
  151.     SPECIAL, /* 0x36 - RShift */
  152.     '*',
  153.     SPECIAL, /* 0x38 - LAlt */
  154.     ' ',
  155.     SPECIAL, /* 0x3a - CapsLock */
  156.     SPECIAL, /* 0x3b - F1 */
  157.     SPECIAL, /* 0x3c - F2 */
  158.     SPECIAL, /* 0x3d - F3 */
  159.     SPECIAL, /* 0x3e - F4 */
  160.     SPECIAL, /* 0x3f - F5 */
  161.     SPECIAL, /* 0x40 - F6 */
  162.     SPECIAL, /* 0x41 - F7 */
  163.     SPECIAL, /* 0x42 - F8 */
  164.     SPECIAL, /* 0x43 - F9 */
  165.     SPECIAL, /* 0x44 - F10 */
  166.     SPECIAL, /* 0x45 - NumLock */
  167.     SPECIAL, /* 0x46 - ScrollLock */
  168.     '7', '8', '9', '-',
  169.     '4', '5', '6', '+',
  170.     '1', '2', '3',
  171.     '0', '.',
  172.     SPECIAL, /* 0x54 - Alt-SysRq */
  173.     SPECIAL, /* 0x55 - F11/F12/PF1/FN */
  174.     SPECIAL, /* 0x56 - unlabelled key next to LAlt */
  175.     SPECIAL, /* 0x57 - F11 */
  176.     SPECIAL, /* 0x58 - F12 */
  177.     SPECIAL, /* 0x59 */
  178.     SPECIAL, /* 0x5a */
  179.     SPECIAL, /* 0x5b */
  180.     SPECIAL, /* 0x5c */
  181.     SPECIAL, /* 0x5d */
  182.     SPECIAL, /* 0x5e */
  183.     SPECIAL, /* 0x5f */
  184.     SPECIAL, /* 0x60 */
  185.     SPECIAL, /* 0x61 */
  186.     SPECIAL, /* 0x62 */
  187.     SPECIAL, /* 0x63 */
  188.     SPECIAL, /* 0x64 */
  189.     SPECIAL, /* 0x65 */
  190.     SPECIAL, /* 0x66 */
  191.     SPECIAL, /* 0x67 */
  192.     SPECIAL, /* 0x68 */
  193.     SPECIAL, /* 0x69 */
  194.     SPECIAL, /* 0x6a */
  195.     SPECIAL, /* 0x6b */
  196.     SPECIAL, /* 0x6c */
  197.     SPECIAL, /* 0x6d */
  198.     SPECIAL, /* 0x6e */
  199.     SPECIAL, /* 0x6f */
  200.     SPECIAL, /* 0x70 */
  201.     SPECIAL, /* 0x71 */
  202.     SPECIAL, /* 0x72 */
  203.     SPECIAL, /* 0x73 */
  204.     SPECIAL, /* 0x74 */
  205.     SPECIAL, /* 0x75 */
  206.     SPECIAL, /* 0x76 */
  207.     SPECIAL, /* 0x77 */
  208.     SPECIAL, /* 0x78 */
  209.     SPECIAL, /* 0x79 */
  210.     SPECIAL, /* 0x7a */
  211.     SPECIAL, /* 0x7b */
  212.     SPECIAL, /* 0x7c */
  213.     SPECIAL, /* 0x7d */
  214.     SPECIAL, /* 0x7e */
  215.     SPECIAL, /* 0x7f */
  216. };
  217.  
  218. /** Initialize i8042. */
  219. void i8042_init(void)
  220. {
  221.     trap_register(VECTOR_KBD, i8042_interrupt);
  222.     spinlock_initialize(&keylock);
  223. }
  224.  
  225. /** Process i8042 interrupt.
  226.  *
  227.  * @param n Interrupt vector.
  228.  * @param stack Interrupted stack.
  229.  */
  230. void i8042_interrupt(__u8 n, __native stack[])
  231. {
  232.     __u8 x;
  233.  
  234.     trap_virtual_eoi();
  235.     x = inb(0x60);
  236.     if (x & KEY_RELEASE)
  237.         key_released(x ^ KEY_RELEASE);
  238.     else
  239.         key_pressed(x);
  240. }
  241.  
  242. /** Process release of key.
  243.  *
  244.  * @param sc Scancode of the key being released.
  245.  */
  246. void key_released(__u8 sc)
  247. {
  248.     spinlock_lock(&keylock);
  249.     switch (sc) {
  250.         case SC_LSHIFT:
  251.         case SC_RSHIFT:
  252.         keyflags &= ~PRESSED_SHIFT;
  253.         break;
  254.         case SC_CAPSLOCK:
  255.         keyflags &= ~PRESSED_CAPSLOCK;
  256.         if (lockflags & LOCKED_CAPSLOCK)
  257.             lockflags &= ~LOCKED_CAPSLOCK;
  258.         else
  259.             lockflags |= LOCKED_CAPSLOCK;
  260.         break;
  261.         default:
  262.         break;
  263.     }
  264.     spinlock_unlock(&keylock);
  265. }
  266.  
  267. /** Process keypress.
  268.  *
  269.  * @param sc Scancode of the key being pressed.
  270.  */
  271. void key_pressed(__u8 sc)
  272. {
  273.     char *map = sc_primary_map;
  274.     char ascii = sc_primary_map[sc];
  275.     bool shift, capslock;
  276.     bool letter = false;
  277.  
  278.     spinlock_lock(&keylock);
  279.     switch (sc) {
  280.         case SC_LSHIFT:
  281.         case SC_RSHIFT:
  282.             keyflags |= PRESSED_SHIFT;
  283.         break;
  284.         case SC_CAPSLOCK:
  285.         keyflags |= PRESSED_CAPSLOCK;
  286.         break;
  287.         default:
  288.             letter = (ascii >= 'a') && (ascii <= 'z');
  289.         capslock = (keyflags & PRESSED_CAPSLOCK) || (lockflags & LOCKED_CAPSLOCK);
  290.         shift = keyflags & PRESSED_SHIFT;
  291.         if (letter && capslock)
  292.             shift = !shift;
  293.         if (shift)
  294.             map = sc_secondary_map;
  295.         putchar(map[sc]);
  296.         break;
  297.     }
  298.     spinlock_unlock(&keylock);
  299. }
  300.