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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. #include <macros.h>
  41. #include <interrupt.h>
  42.  
  43. /**
  44.  * i8042 processor driver.
  45.  * It takes care of low-level keyboard functions.
  46.  */
  47.  
  48. #define i8042_DATA      0x60
  49. #define i8042_STATUS        0x64
  50.  
  51.  
  52. /** Keyboard commands. */
  53. #define KBD_ENABLE  0xf4
  54. #define KBD_DISABLE 0xf5
  55. #define KBD_ACK     0xfa
  56.  
  57. /*
  58.  60   Write 8042 Command Byte: next data byte written to port 60h is
  59.       placed in 8042 command register.Format:
  60.  
  61.      |7|6|5|4|3|2|1|0|8042 Command Byte
  62.       | | | | | | | `---- 1=enable output register full interrupt
  63.       | | | | | | `----- should be 0
  64.       | | | | | `------ 1=set status register system, 0=clear
  65.       | | | | `------- 1=override keyboard inhibit, 0=allow inhibit
  66.       | | | `-------- disable keyboard I/O by driving clock line low
  67.       | | `--------- disable auxiliary device, drives clock line low
  68.       | `---------- IBM scancode translation 0=AT, 1=PC/XT
  69.       `----------- reserved, should be 0
  70. */
  71.  
  72. #define i8042_SET_COMMAND 0x60
  73. #define i8042_COMMAND 0x49
  74. #define i8042_WAIT_MASK 0x02
  75.  
  76.  
  77. #define SPECIAL     '?'
  78. #define KEY_RELEASE 0x80
  79.  
  80. static void key_released(__u8 sc);
  81. static void key_pressed(__u8 sc);
  82.  
  83. #define PRESSED_SHIFT       (1<<0)
  84. #define PRESSED_CAPSLOCK    (1<<1)
  85. #define LOCKED_CAPSLOCK     (1<<0)
  86.  
  87. SPINLOCK_INITIALIZE(keylock);       /**< keylock protects keyflags and lockflags. */
  88. static volatile int keyflags;       /**< Tracking of multiple keypresses. */
  89. static volatile int lockflags;      /**< Tracking of multiple keys lockings. */
  90.  
  91. static void i8042_suspend(chardev_t *);
  92. static void i8042_resume(chardev_t *);
  93.  
  94. static chardev_t kbrd;
  95. static chardev_operations_t ops = {
  96.     .suspend = i8042_suspend,
  97.     .resume = i8042_resume
  98. };
  99.  
  100. /** Primary meaning of scancodes. */
  101. static char sc_primary_map[] = {
  102.     SPECIAL, /* 0x00 */
  103.     SPECIAL, /* 0x01 - Esc */
  104.     '1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '-', '=',
  105.     '\b', /* 0x0e - Backspace */
  106.     '\t', 'q', 'w', 'e', 'r', 't', 'y', 'u', 'i', 'o', 'p', '[', ']', '\n',
  107.     SPECIAL, /* 0x1d - LCtrl */
  108.     'a', 's', 'd', 'f', 'g', 'h', 'j', 'k', 'l', ';', '\'',
  109.     '`',
  110.     SPECIAL, /* 0x2a - LShift */
  111.     '\\',
  112.     'z', 'x', 'c', 'v', 'b', 'n', 'm', ',', '.', '/',
  113.     SPECIAL, /* 0x36 - RShift */
  114.     '*',
  115.     SPECIAL, /* 0x38 - LAlt */
  116.     ' ',
  117.     SPECIAL, /* 0x3a - CapsLock */
  118.     SPECIAL, /* 0x3b - F1 */
  119.     SPECIAL, /* 0x3c - F2 */
  120.     SPECIAL, /* 0x3d - F3 */
  121.     SPECIAL, /* 0x3e - F4 */
  122.     SPECIAL, /* 0x3f - F5 */
  123.     SPECIAL, /* 0x40 - F6 */
  124.     SPECIAL, /* 0x41 - F7 */
  125.     SPECIAL, /* 0x42 - F8 */
  126.     SPECIAL, /* 0x43 - F9 */
  127.     SPECIAL, /* 0x44 - F10 */
  128.     SPECIAL, /* 0x45 - NumLock */
  129.     SPECIAL, /* 0x46 - ScrollLock */
  130.     '7', '8', '9', '-',
  131.     '4', '5', '6', '+',
  132.     '1', '2', '3',
  133.     '0', '.',
  134.     SPECIAL, /* 0x54 - Alt-SysRq */
  135.     SPECIAL, /* 0x55 - F11/F12/PF1/FN */
  136.     SPECIAL, /* 0x56 - unlabelled key next to LAlt */
  137.     SPECIAL, /* 0x57 - F11 */
  138.     SPECIAL, /* 0x58 - F12 */
  139.     SPECIAL, /* 0x59 */
  140.     SPECIAL, /* 0x5a */
  141.     SPECIAL, /* 0x5b */
  142.     SPECIAL, /* 0x5c */
  143.     SPECIAL, /* 0x5d */
  144.     SPECIAL, /* 0x5e */
  145.     SPECIAL, /* 0x5f */
  146.     SPECIAL, /* 0x60 */
  147.     SPECIAL, /* 0x61 */
  148.     SPECIAL, /* 0x62 */
  149.     SPECIAL, /* 0x63 */
  150.     SPECIAL, /* 0x64 */
  151.     SPECIAL, /* 0x65 */
  152.     SPECIAL, /* 0x66 */
  153.     SPECIAL, /* 0x67 */
  154.     SPECIAL, /* 0x68 */
  155.     SPECIAL, /* 0x69 */
  156.     SPECIAL, /* 0x6a */
  157.     SPECIAL, /* 0x6b */
  158.     SPECIAL, /* 0x6c */
  159.     SPECIAL, /* 0x6d */
  160.     SPECIAL, /* 0x6e */
  161.     SPECIAL, /* 0x6f */
  162.     SPECIAL, /* 0x70 */
  163.     SPECIAL, /* 0x71 */
  164.     SPECIAL, /* 0x72 */
  165.     SPECIAL, /* 0x73 */
  166.     SPECIAL, /* 0x74 */
  167.     SPECIAL, /* 0x75 */
  168.     SPECIAL, /* 0x76 */
  169.     SPECIAL, /* 0x77 */
  170.     SPECIAL, /* 0x78 */
  171.     SPECIAL, /* 0x79 */
  172.     SPECIAL, /* 0x7a */
  173.     SPECIAL, /* 0x7b */
  174.     SPECIAL, /* 0x7c */
  175.     SPECIAL, /* 0x7d */
  176.     SPECIAL, /* 0x7e */
  177.     SPECIAL, /* 0x7f */
  178. };
  179.  
  180. /** Secondary meaning of scancodes. */
  181. static char sc_secondary_map[] = {
  182.     SPECIAL, /* 0x00 */
  183.     SPECIAL, /* 0x01 - Esc */
  184.     '!', '@', '#', '$', '%', '^', '&', '*', '(', ')', '_', '+',
  185.     SPECIAL, /* 0x0e - Backspace */
  186.     '\t', 'Q', 'W', 'E', 'R', 'T', 'Y', 'U', 'I', 'O', 'P', '{', '}', '\n',
  187.     SPECIAL, /* 0x1d - LCtrl */
  188.     'A', 'S', 'D', 'F', 'G', 'H', 'J', 'K', 'L', ':', '"',
  189.     '~',
  190.     SPECIAL, /* 0x2a - LShift */
  191.     '|',
  192.     'Z', 'X', 'C', 'V', 'B', 'N', 'M', '<', '>', '?',
  193.     SPECIAL, /* 0x36 - RShift */
  194.     '*',
  195.     SPECIAL, /* 0x38 - LAlt */
  196.     ' ',
  197.     SPECIAL, /* 0x3a - CapsLock */
  198.     SPECIAL, /* 0x3b - F1 */
  199.     SPECIAL, /* 0x3c - F2 */
  200.     SPECIAL, /* 0x3d - F3 */
  201.     SPECIAL, /* 0x3e - F4 */
  202.     SPECIAL, /* 0x3f - F5 */
  203.     SPECIAL, /* 0x40 - F6 */
  204.     SPECIAL, /* 0x41 - F7 */
  205.     SPECIAL, /* 0x42 - F8 */
  206.     SPECIAL, /* 0x43 - F9 */
  207.     SPECIAL, /* 0x44 - F10 */
  208.     SPECIAL, /* 0x45 - NumLock */
  209.     SPECIAL, /* 0x46 - ScrollLock */
  210.     '7', '8', '9', '-',
  211.     '4', '5', '6', '+',
  212.     '1', '2', '3',
  213.     '0', '.',
  214.     SPECIAL, /* 0x54 - Alt-SysRq */
  215.     SPECIAL, /* 0x55 - F11/F12/PF1/FN */
  216.     SPECIAL, /* 0x56 - unlabelled key next to LAlt */
  217.     SPECIAL, /* 0x57 - F11 */
  218.     SPECIAL, /* 0x58 - F12 */
  219.     SPECIAL, /* 0x59 */
  220.     SPECIAL, /* 0x5a */
  221.     SPECIAL, /* 0x5b */
  222.     SPECIAL, /* 0x5c */
  223.     SPECIAL, /* 0x5d */
  224.     SPECIAL, /* 0x5e */
  225.     SPECIAL, /* 0x5f */
  226.     SPECIAL, /* 0x60 */
  227.     SPECIAL, /* 0x61 */
  228.     SPECIAL, /* 0x62 */
  229.     SPECIAL, /* 0x63 */
  230.     SPECIAL, /* 0x64 */
  231.     SPECIAL, /* 0x65 */
  232.     SPECIAL, /* 0x66 */
  233.     SPECIAL, /* 0x67 */
  234.     SPECIAL, /* 0x68 */
  235.     SPECIAL, /* 0x69 */
  236.     SPECIAL, /* 0x6a */
  237.     SPECIAL, /* 0x6b */
  238.     SPECIAL, /* 0x6c */
  239.     SPECIAL, /* 0x6d */
  240.     SPECIAL, /* 0x6e */
  241.     SPECIAL, /* 0x6f */
  242.     SPECIAL, /* 0x70 */
  243.     SPECIAL, /* 0x71 */
  244.     SPECIAL, /* 0x72 */
  245.     SPECIAL, /* 0x73 */
  246.     SPECIAL, /* 0x74 */
  247.     SPECIAL, /* 0x75 */
  248.     SPECIAL, /* 0x76 */
  249.     SPECIAL, /* 0x77 */
  250.     SPECIAL, /* 0x78 */
  251.     SPECIAL, /* 0x79 */
  252.     SPECIAL, /* 0x7a */
  253.     SPECIAL, /* 0x7b */
  254.     SPECIAL, /* 0x7c */
  255.     SPECIAL, /* 0x7d */
  256.     SPECIAL, /* 0x7e */
  257.     SPECIAL, /* 0x7f */
  258. };
  259.  
  260. static void i8042_interrupt(int n, void *stack);
  261.  
  262. /** Initialize i8042. */
  263. void i8042_init(void)
  264. {
  265.     exc_register(VECTOR_KBD, "i8042_interrupt", i8042_interrupt);
  266.     while (inb(i8042_STATUS)&i8042_WAIT_MASK);     /*Wait*/
  267.     outb(i8042_STATUS,i8042_SET_COMMAND);
  268.     while (inb(i8042_STATUS)&i8042_WAIT_MASK);     /*Wait*/
  269.     outb(i8042_DATA,i8042_COMMAND);
  270.  
  271.     trap_virtual_enable_irqs(1<<IRQ_KBD);
  272.     chardev_initialize("i8042_kbd", &kbrd, &ops);
  273.     stdin = &kbrd;
  274. }
  275.  
  276. /** Process i8042 interrupt.
  277.  *
  278.  * @param n Interrupt vector.
  279.  * @param stack Interrupted stack.
  280.  */
  281. void i8042_interrupt(int n, void *stack)
  282. {
  283.     __u8 x;
  284.  
  285.     trap_virtual_eoi();
  286.     x = inb(i8042_DATA);
  287.     if (x & KEY_RELEASE)
  288.         key_released(x ^ KEY_RELEASE);
  289.     else
  290.         key_pressed(x);
  291. }
  292.  
  293. /** Process release of key.
  294.  *
  295.  * @param sc Scancode of the key being released.
  296.  */
  297. void key_released(__u8 sc)
  298. {
  299.     spinlock_lock(&keylock);
  300.     switch (sc) {
  301.         case SC_LSHIFT:
  302.         case SC_RSHIFT:
  303.         keyflags &= ~PRESSED_SHIFT;
  304.         break;
  305.         case SC_CAPSLOCK:
  306.         keyflags &= ~PRESSED_CAPSLOCK;
  307.         if (lockflags & LOCKED_CAPSLOCK)
  308.             lockflags &= ~LOCKED_CAPSLOCK;
  309.         else
  310.             lockflags |= LOCKED_CAPSLOCK;
  311.         break;
  312.         default:
  313.         break;
  314.     }
  315.     spinlock_unlock(&keylock);
  316. }
  317.  
  318. /** Process keypress.
  319.  *
  320.  * @param sc Scancode of the key being pressed.
  321.  */
  322. void key_pressed(__u8 sc)
  323. {
  324.     char *map = sc_primary_map;
  325.     char ascii = sc_primary_map[sc];
  326.     bool shift, capslock;
  327.     bool letter = false;
  328.  
  329.     spinlock_lock(&keylock);
  330.     switch (sc) {
  331.     case SC_LSHIFT:
  332.     case SC_RSHIFT:
  333.             keyflags |= PRESSED_SHIFT;
  334.         break;
  335.     case SC_CAPSLOCK:
  336.         keyflags |= PRESSED_CAPSLOCK;
  337.         break;
  338.     case SC_SPEC_ESCAPE:
  339.         break;
  340.     case SC_LEFTARR:
  341.         chardev_push_character(&kbrd, 0x1b);
  342.         chardev_push_character(&kbrd, 0x5b);
  343.         chardev_push_character(&kbrd, 0x44);
  344.         break;
  345.     case SC_RIGHTARR:
  346.         chardev_push_character(&kbrd, 0x1b);
  347.         chardev_push_character(&kbrd, 0x5b);
  348.         chardev_push_character(&kbrd, 0x43);
  349.         break;
  350.     case SC_UPARR:
  351.         chardev_push_character(&kbrd, 0x1b);
  352.         chardev_push_character(&kbrd, 0x5b);
  353.         chardev_push_character(&kbrd, 0x41);
  354.         break;
  355.     case SC_DOWNARR:
  356.         chardev_push_character(&kbrd, 0x1b);
  357.         chardev_push_character(&kbrd, 0x5b);
  358.         chardev_push_character(&kbrd, 0x42);
  359.         break;
  360.     case SC_HOME:
  361.         chardev_push_character(&kbrd, 0x1b);
  362.         chardev_push_character(&kbrd, 0x4f);
  363.         chardev_push_character(&kbrd, 0x48);
  364.         break;
  365.     case SC_END:
  366.         chardev_push_character(&kbrd, 0x1b);
  367.         chardev_push_character(&kbrd, 0x4f);
  368.         chardev_push_character(&kbrd, 0x46);
  369.         break;
  370.     case SC_DELETE:
  371.         chardev_push_character(&kbrd, 0x1b);
  372.         chardev_push_character(&kbrd, 0x5b);
  373.         chardev_push_character(&kbrd, 0x33);
  374.         chardev_push_character(&kbrd, 0x7e);
  375.         break;
  376.     default:
  377.             letter = is_lower(ascii);
  378.         capslock = (keyflags & PRESSED_CAPSLOCK) || (lockflags & LOCKED_CAPSLOCK);
  379.         shift = keyflags & PRESSED_SHIFT;
  380.         if (letter && capslock)
  381.             shift = !shift;
  382.         if (shift)
  383.             map = sc_secondary_map;
  384.         chardev_push_character(&kbrd, map[sc]);
  385.         break;
  386.     }
  387.     spinlock_unlock(&keylock);
  388. }
  389.  
  390. /* Called from getc(). */
  391. void i8042_resume(chardev_t *d)
  392. {
  393. }
  394.  
  395. /* Called from getc(). */
  396. void i8042_suspend(chardev_t *d)
  397. {
  398. }
  399.