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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. #include <console/chardev.h>
  39. #include <console/console.h>
  40.  
  41. /**
  42.  * i8042 processor driver.
  43.  * It takes care of low-level keyboard functions.
  44.  */
  45.  
  46. #define i8042_DATA      0x60
  47. #define i8042_STATUS        0x64
  48.  
  49. /** Keyboard commands. */
  50. #define KBD_ENABLE  0xf4
  51. #define KBD_DISABLE 0xf5
  52. #define KBD_ACK     0xfa
  53.  
  54. #define SPECIAL     '?'
  55. #define KEY_RELEASE 0x80
  56.  
  57. static void key_released(__u8 sc);
  58. static void key_pressed(__u8 sc);
  59.  
  60. #define PRESSED_SHIFT       (1<<0)
  61. #define PRESSED_CAPSLOCK    (1<<1)
  62. #define LOCKED_CAPSLOCK     (1<<0)
  63.  
  64. static spinlock_t keylock;      /**< keylock protects keyflags and lockflags. */
  65. static volatile int keyflags;       /**< Tracking of multiple keypresses. */
  66. static volatile int lockflags;      /**< Tracking of multiple keys lockings. */
  67.  
  68. static void i8042_suspend(void);
  69. static void i8042_resume(void);
  70.  
  71. static chardev_t kbrd;
  72. static chardev_operations_t ops = {
  73.     .suspend = i8042_suspend,
  74.     .resume = i8042_resume
  75. };
  76.  
  77. /** Primary meaning of scancodes. */
  78. static char sc_primary_map[] = {
  79.     SPECIAL, /* 0x00 */
  80.     SPECIAL, /* 0x01 - Esc */
  81.     '1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '-', '=',
  82.     SPECIAL, /* 0x0e - Backspace */
  83.     '\t', 'q', 'w', 'e', 'r', 't', 'y', 'u', 'i', 'o', 'p', '[', ']', '\n',
  84.     SPECIAL, /* 0x1d - LCtrl */
  85.     'a', 's', 'd', 'f', 'g', 'h', 'j', 'k', 'l', ';', '\'',
  86.     '`',
  87.     SPECIAL, /* 0x2a - LShift */
  88.     '\\',
  89.     'z', 'x', 'c', 'v', 'b', 'n', 'm', ',', '.', '/',
  90.     SPECIAL, /* 0x36 - RShift */
  91.     '*',
  92.     SPECIAL, /* 0x38 - LAlt */
  93.     ' ',
  94.     SPECIAL, /* 0x3a - CapsLock */
  95.     SPECIAL, /* 0x3b - F1 */
  96.     SPECIAL, /* 0x3c - F2 */
  97.     SPECIAL, /* 0x3d - F3 */
  98.     SPECIAL, /* 0x3e - F4 */
  99.     SPECIAL, /* 0x3f - F5 */
  100.     SPECIAL, /* 0x40 - F6 */
  101.     SPECIAL, /* 0x41 - F7 */
  102.     SPECIAL, /* 0x42 - F8 */
  103.     SPECIAL, /* 0x43 - F9 */
  104.     SPECIAL, /* 0x44 - F10 */
  105.     SPECIAL, /* 0x45 - NumLock */
  106.     SPECIAL, /* 0x46 - ScrollLock */
  107.     '7', '8', '9', '-',
  108.     '4', '5', '6', '+',
  109.     '1', '2', '3',
  110.     '0', '.',
  111.     SPECIAL, /* 0x54 - Alt-SysRq */
  112.     SPECIAL, /* 0x55 - F11/F12/PF1/FN */
  113.     SPECIAL, /* 0x56 - unlabelled key next to LAlt */
  114.     SPECIAL, /* 0x57 - F11 */
  115.     SPECIAL, /* 0x58 - F12 */
  116.     SPECIAL, /* 0x59 */
  117.     SPECIAL, /* 0x5a */
  118.     SPECIAL, /* 0x5b */
  119.     SPECIAL, /* 0x5c */
  120.     SPECIAL, /* 0x5d */
  121.     SPECIAL, /* 0x5e */
  122.     SPECIAL, /* 0x5f */
  123.     SPECIAL, /* 0x60 */
  124.     SPECIAL, /* 0x61 */
  125.     SPECIAL, /* 0x62 */
  126.     SPECIAL, /* 0x63 */
  127.     SPECIAL, /* 0x64 */
  128.     SPECIAL, /* 0x65 */
  129.     SPECIAL, /* 0x66 */
  130.     SPECIAL, /* 0x67 */
  131.     SPECIAL, /* 0x68 */
  132.     SPECIAL, /* 0x69 */
  133.     SPECIAL, /* 0x6a */
  134.     SPECIAL, /* 0x6b */
  135.     SPECIAL, /* 0x6c */
  136.     SPECIAL, /* 0x6d */
  137.     SPECIAL, /* 0x6e */
  138.     SPECIAL, /* 0x6f */
  139.     SPECIAL, /* 0x70 */
  140.     SPECIAL, /* 0x71 */
  141.     SPECIAL, /* 0x72 */
  142.     SPECIAL, /* 0x73 */
  143.     SPECIAL, /* 0x74 */
  144.     SPECIAL, /* 0x75 */
  145.     SPECIAL, /* 0x76 */
  146.     SPECIAL, /* 0x77 */
  147.     SPECIAL, /* 0x78 */
  148.     SPECIAL, /* 0x79 */
  149.     SPECIAL, /* 0x7a */
  150.     SPECIAL, /* 0x7b */
  151.     SPECIAL, /* 0x7c */
  152.     SPECIAL, /* 0x7d */
  153.     SPECIAL, /* 0x7e */
  154.     SPECIAL, /* 0x7f */
  155. };
  156.  
  157. /** Secondary meaning of scancodes. */
  158. static char sc_secondary_map[] = {
  159.     SPECIAL, /* 0x00 */
  160.     SPECIAL, /* 0x01 - Esc */
  161.     '!', '@', '#', '$', '%', '^', '&', '*', '(', ')', '_', '+',
  162.     SPECIAL, /* 0x0e - Backspace */
  163.     '\t', 'Q', 'W', 'E', 'R', 'T', 'Y', 'U', 'I', 'O', 'P', '{', '}', '\n',
  164.     SPECIAL, /* 0x1d - LCtrl */
  165.     'A', 'S', 'D', 'F', 'G', 'H', 'J', 'K', 'L', ':', '"',
  166.     '~',
  167.     SPECIAL, /* 0x2a - LShift */
  168.     '|',
  169.     'Z', 'X', 'C', 'V', 'B', 'N', 'M', '<', '>', '?',
  170.     SPECIAL, /* 0x36 - RShift */
  171.     '*',
  172.     SPECIAL, /* 0x38 - LAlt */
  173.     ' ',
  174.     SPECIAL, /* 0x3a - CapsLock */
  175.     SPECIAL, /* 0x3b - F1 */
  176.     SPECIAL, /* 0x3c - F2 */
  177.     SPECIAL, /* 0x3d - F3 */
  178.     SPECIAL, /* 0x3e - F4 */
  179.     SPECIAL, /* 0x3f - F5 */
  180.     SPECIAL, /* 0x40 - F6 */
  181.     SPECIAL, /* 0x41 - F7 */
  182.     SPECIAL, /* 0x42 - F8 */
  183.     SPECIAL, /* 0x43 - F9 */
  184.     SPECIAL, /* 0x44 - F10 */
  185.     SPECIAL, /* 0x45 - NumLock */
  186.     SPECIAL, /* 0x46 - ScrollLock */
  187.     '7', '8', '9', '-',
  188.     '4', '5', '6', '+',
  189.     '1', '2', '3',
  190.     '0', '.',
  191.     SPECIAL, /* 0x54 - Alt-SysRq */
  192.     SPECIAL, /* 0x55 - F11/F12/PF1/FN */
  193.     SPECIAL, /* 0x56 - unlabelled key next to LAlt */
  194.     SPECIAL, /* 0x57 - F11 */
  195.     SPECIAL, /* 0x58 - F12 */
  196.     SPECIAL, /* 0x59 */
  197.     SPECIAL, /* 0x5a */
  198.     SPECIAL, /* 0x5b */
  199.     SPECIAL, /* 0x5c */
  200.     SPECIAL, /* 0x5d */
  201.     SPECIAL, /* 0x5e */
  202.     SPECIAL, /* 0x5f */
  203.     SPECIAL, /* 0x60 */
  204.     SPECIAL, /* 0x61 */
  205.     SPECIAL, /* 0x62 */
  206.     SPECIAL, /* 0x63 */
  207.     SPECIAL, /* 0x64 */
  208.     SPECIAL, /* 0x65 */
  209.     SPECIAL, /* 0x66 */
  210.     SPECIAL, /* 0x67 */
  211.     SPECIAL, /* 0x68 */
  212.     SPECIAL, /* 0x69 */
  213.     SPECIAL, /* 0x6a */
  214.     SPECIAL, /* 0x6b */
  215.     SPECIAL, /* 0x6c */
  216.     SPECIAL, /* 0x6d */
  217.     SPECIAL, /* 0x6e */
  218.     SPECIAL, /* 0x6f */
  219.     SPECIAL, /* 0x70 */
  220.     SPECIAL, /* 0x71 */
  221.     SPECIAL, /* 0x72 */
  222.     SPECIAL, /* 0x73 */
  223.     SPECIAL, /* 0x74 */
  224.     SPECIAL, /* 0x75 */
  225.     SPECIAL, /* 0x76 */
  226.     SPECIAL, /* 0x77 */
  227.     SPECIAL, /* 0x78 */
  228.     SPECIAL, /* 0x79 */
  229.     SPECIAL, /* 0x7a */
  230.     SPECIAL, /* 0x7b */
  231.     SPECIAL, /* 0x7c */
  232.     SPECIAL, /* 0x7d */
  233.     SPECIAL, /* 0x7e */
  234.     SPECIAL, /* 0x7f */
  235. };
  236.  
  237. /** Initialize i8042. */
  238. void i8042_init(void)
  239. {
  240.     trap_register(VECTOR_KBD, i8042_interrupt);
  241.     trap_virtual_enable_irqs(1<<IRQ_KBD);
  242.     spinlock_initialize(&keylock);
  243.     chardev_initialize(&kbrd, &ops);
  244.     stdin = &kbrd;
  245. }
  246.  
  247. /** Process i8042 interrupt.
  248.  *
  249.  * @param n Interrupt vector.
  250.  * @param stack Interrupted stack.
  251.  */
  252. void i8042_interrupt(__u8 n, __native stack[])
  253. {
  254.     __u8 x;
  255.  
  256.     trap_virtual_eoi();
  257.     x = inb(i8042_DATA);
  258.     if (x & KEY_RELEASE)
  259.         key_released(x ^ KEY_RELEASE);
  260.     else
  261.         key_pressed(x);
  262. }
  263.  
  264. /** Process release of key.
  265.  *
  266.  * @param sc Scancode of the key being released.
  267.  */
  268. void key_released(__u8 sc)
  269. {
  270.     spinlock_lock(&keylock);
  271.     switch (sc) {
  272.         case SC_LSHIFT:
  273.         case SC_RSHIFT:
  274.         keyflags &= ~PRESSED_SHIFT;
  275.         break;
  276.         case SC_CAPSLOCK:
  277.         keyflags &= ~PRESSED_CAPSLOCK;
  278.         if (lockflags & LOCKED_CAPSLOCK)
  279.             lockflags &= ~LOCKED_CAPSLOCK;
  280.         else
  281.             lockflags |= LOCKED_CAPSLOCK;
  282.         break;
  283.         default:
  284.         break;
  285.     }
  286.     spinlock_unlock(&keylock);
  287. }
  288.  
  289. /** Process keypress.
  290.  *
  291.  * @param sc Scancode of the key being pressed.
  292.  */
  293. void key_pressed(__u8 sc)
  294. {
  295.     char *map = sc_primary_map;
  296.     char ascii = sc_primary_map[sc];
  297.     bool shift, capslock;
  298.     bool letter = false;
  299.  
  300.     spinlock_lock(&keylock);
  301.     switch (sc) {
  302.         case SC_LSHIFT:
  303.         case SC_RSHIFT:
  304.             keyflags |= PRESSED_SHIFT;
  305.         break;
  306.         case SC_CAPSLOCK:
  307.         keyflags |= PRESSED_CAPSLOCK;
  308.         break;
  309.         default:
  310.             letter = (ascii >= 'a') && (ascii <= 'z');
  311.         capslock = (keyflags & PRESSED_CAPSLOCK) || (lockflags & LOCKED_CAPSLOCK);
  312.         shift = keyflags & PRESSED_SHIFT;
  313.         if (letter && capslock)
  314.             shift = !shift;
  315.         if (shift)
  316.             map = sc_secondary_map;
  317.         chardev_push_character(&kbrd, map[sc]);
  318.         break;
  319.     }
  320.     spinlock_unlock(&keylock);
  321. }
  322.  
  323. /* Called from getc(). */
  324. void i8042_resume(void)
  325. {
  326. }
  327.  
  328. /* Called from getc(). */
  329. void i8042_suspend(void)
  330. {
  331. }
  332.