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1 jermar 1
/*
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 * Copyright (C) 2001-2004 Jakub Jermar
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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#include <arch/i8042.h>
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#include <arch/i8259.h>
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#include <arch/interrupt.h>
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#include <cpu.h>
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#include <arch/asm.h>
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#include <arch.h>
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#include <print.h>
508 jermar 36
#include <synch/spinlock.h>
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#include <typedefs.h>
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/**
1 jermar 40
 * i8042 processor driver.
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 * It takes care of low-level keyboard functions.
1 jermar 42
 */
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#define SPECIAL     '?'
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#define KEY_RELEASE 0x80
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static void key_released(__u8 sc);
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static void key_pressed(__u8 sc);
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#define PRESSED_SHIFT       (1<<0)
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#define PRESSED_CAPSLOCK    (1<<1)
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#define LOCKED_CAPSLOCK     (1<<0)
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static spinlock_t keylock;  /**< keylock protects keyflags and lockflags. */
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static volatile int keyflags;       /**< Tracking of multiple keypresses. */
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static volatile int lockflags;      /**< Tracking of multiple lock keys keypresses. */
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/** Primary meaning of scancodes. */
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static char sc_primary_map[] = {
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    SPECIAL, /* 0x00 */
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    SPECIAL, /* 0x01 - Esc */
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    '1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '-', '=',
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    SPECIAL, /* 0x0e - Backspace */
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    '\t', 'q', 'w', 'e', 'r', 't', 'y', 'u', 'i', 'o', 'p', '[', ']', '\n',
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    SPECIAL, /* 0x1d - LCtrl */
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    'a', 's', 'd', 'f', 'g', 'h', 'j', 'k', 'l', ';', '\'',
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    '`',
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    SPECIAL, /* 0x2a - LShift */
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    '\\',
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    'z', 'x', 'c', 'v', 'b', 'n', 'm', ',', '.', '/',
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    SPECIAL, /* 0x36 - RShift */
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    '*',
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    SPECIAL, /* 0x38 - LAlt */
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    ' ',
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    SPECIAL, /* 0x3a - CapsLock */
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    SPECIAL, /* 0x3b - F1 */
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    SPECIAL, /* 0x3c - F2 */
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    SPECIAL, /* 0x3d - F3 */
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    SPECIAL, /* 0x3e - F4 */
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    SPECIAL, /* 0x3f - F5 */
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    SPECIAL, /* 0x40 - F6 */
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    SPECIAL, /* 0x41 - F7 */
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    SPECIAL, /* 0x42 - F8 */
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    SPECIAL, /* 0x43 - F9 */
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    SPECIAL, /* 0x44 - F10 */
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    SPECIAL, /* 0x45 - NumLock */
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    SPECIAL, /* 0x46 - ScrollLock */
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    '7', '8', '9', '-',
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    '4', '5', '6', '+',
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    '1', '2', '3',
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    '0', '.',
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    SPECIAL, /* 0x54 - Alt-SysRq */
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    SPECIAL, /* 0x55 - F11/F12/PF1/FN */
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    SPECIAL, /* 0x56 - unlabelled key next to LAlt */
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    SPECIAL, /* 0x57 - F11 */
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    SPECIAL, /* 0x58 - F12 */
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    SPECIAL, /* 0x59 */
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    SPECIAL, /* 0x5a */
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    SPECIAL, /* 0x5b */
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    SPECIAL, /* 0x5c */
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    SPECIAL, /* 0x5d */
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    SPECIAL, /* 0x5e */
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    SPECIAL, /* 0x5f */
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    SPECIAL, /* 0x60 */
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    SPECIAL, /* 0x61 */
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    SPECIAL, /* 0x62 */
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    SPECIAL, /* 0x63 */
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    SPECIAL, /* 0x64 */
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    SPECIAL, /* 0x65 */
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    SPECIAL, /* 0x66 */
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    SPECIAL, /* 0x67 */
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    SPECIAL, /* 0x68 */
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    SPECIAL, /* 0x69 */
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    SPECIAL, /* 0x6a */
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    SPECIAL, /* 0x6b */
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    SPECIAL, /* 0x6c */
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    SPECIAL, /* 0x6d */
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    SPECIAL, /* 0x6e */
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    SPECIAL, /* 0x6f */
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    SPECIAL, /* 0x70 */
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    SPECIAL, /* 0x71 */
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    SPECIAL, /* 0x72 */
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    SPECIAL, /* 0x73 */
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    SPECIAL, /* 0x74 */
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    SPECIAL, /* 0x75 */
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    SPECIAL, /* 0x76 */
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    SPECIAL, /* 0x77 */
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    SPECIAL, /* 0x78 */
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    SPECIAL, /* 0x79 */
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    SPECIAL, /* 0x7a */
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    SPECIAL, /* 0x7b */
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    SPECIAL, /* 0x7c */
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    SPECIAL, /* 0x7d */
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    SPECIAL, /* 0x7e */
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    SPECIAL, /* 0x7f */
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};
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/** Secondary meaning of scancodes. */
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static char sc_secondary_map[] = {
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    SPECIAL, /* 0x00 */
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    SPECIAL, /* 0x01 - Esc */
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    '!', '@', '#', '$', '%', '^', '&', '*', '(', ')', '_', '+',
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    SPECIAL, /* 0x0e - Backspace */
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    '\t', 'Q', 'W', 'E', 'R', 'T', 'Y', 'U', 'I', 'O', 'P', '{', '}', '\n',
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    SPECIAL, /* 0x1d - LCtrl */
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    'A', 'S', 'D', 'F', 'G', 'H', 'J', 'K', 'L', ':', '"',
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    '~',
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    SPECIAL, /* 0x2a - LShift */
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    '|',
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    'Z', 'X', 'C', 'V', 'B', 'N', 'M', '<', '>', '?',
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    SPECIAL, /* 0x36 - RShift */
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    '*',
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    SPECIAL, /* 0x38 - LAlt */
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    ' ',
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    SPECIAL, /* 0x3a - CapsLock */
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    SPECIAL, /* 0x3b - F1 */
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    SPECIAL, /* 0x3c - F2 */
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    SPECIAL, /* 0x3d - F3 */
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    SPECIAL, /* 0x3e - F4 */
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    SPECIAL, /* 0x3f - F5 */
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    SPECIAL, /* 0x40 - F6 */
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    SPECIAL, /* 0x41 - F7 */
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    SPECIAL, /* 0x42 - F8 */
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    SPECIAL, /* 0x43 - F9 */
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    SPECIAL, /* 0x44 - F10 */
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    SPECIAL, /* 0x45 - NumLock */
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    SPECIAL, /* 0x46 - ScrollLock */
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    '7', '8', '9', '-',
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    '4', '5', '6', '+',
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    '1', '2', '3',
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    '0', '.',
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    SPECIAL, /* 0x54 - Alt-SysRq */
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    SPECIAL, /* 0x55 - F11/F12/PF1/FN */
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    SPECIAL, /* 0x56 - unlabelled key next to LAlt */
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    SPECIAL, /* 0x57 - F11 */
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    SPECIAL, /* 0x58 - F12 */
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    SPECIAL, /* 0x59 */
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    SPECIAL, /* 0x5a */
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    SPECIAL, /* 0x5b */
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    SPECIAL, /* 0x5c */
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    SPECIAL, /* 0x5d */
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    SPECIAL, /* 0x5e */
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    SPECIAL, /* 0x5f */
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    SPECIAL, /* 0x60 */
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    SPECIAL, /* 0x61 */
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    SPECIAL, /* 0x62 */
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    SPECIAL, /* 0x63 */
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    SPECIAL, /* 0x64 */
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    SPECIAL, /* 0x65 */
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    SPECIAL, /* 0x66 */
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    SPECIAL, /* 0x67 */
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    SPECIAL, /* 0x68 */
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    SPECIAL, /* 0x69 */
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    SPECIAL, /* 0x6a */
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    SPECIAL, /* 0x6b */
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    SPECIAL, /* 0x6c */
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    SPECIAL, /* 0x6d */
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    SPECIAL, /* 0x6e */
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    SPECIAL, /* 0x6f */
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    SPECIAL, /* 0x70 */
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    SPECIAL, /* 0x71 */
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    SPECIAL, /* 0x72 */
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    SPECIAL, /* 0x73 */
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    SPECIAL, /* 0x74 */
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    SPECIAL, /* 0x75 */
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    SPECIAL, /* 0x76 */
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    SPECIAL, /* 0x77 */
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    SPECIAL, /* 0x78 */
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    SPECIAL, /* 0x79 */
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    SPECIAL, /* 0x7a */
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    SPECIAL, /* 0x7b */
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    SPECIAL, /* 0x7c */
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    SPECIAL, /* 0x7d */
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    SPECIAL, /* 0x7e */
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    SPECIAL, /* 0x7f */
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};
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/** Initialize i8042. */
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void i8042_init(void)
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{
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    trap_register(VECTOR_KBD, i8042_interrupt);
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    spinlock_initialize(&keylock);
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}
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/** Process i8042 interrupt.
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 *
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 * @param n Interrupt vector.
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 * @param stack Interrupted stack.
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 */
206 palkovsky 230
void i8042_interrupt(__u8 n, __native stack[])
1 jermar 231
{
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    __u8 x;
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    trap_virtual_eoi();
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    x = inb(0x60);
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    if (x & KEY_RELEASE)
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        key_released(x ^ KEY_RELEASE);
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    else
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        key_pressed(x);
1 jermar 240
}
508 jermar 241
 
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/** Process release of key.
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 *
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 * @param sc Scancode of the key being released.
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 */
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void key_released(__u8 sc)
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{
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    spinlock_lock(&keylock);
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    switch (sc) {
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        case SC_LSHIFT:
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        case SC_RSHIFT:
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        keyflags &= ~PRESSED_SHIFT;
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        break;
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        case SC_CAPSLOCK:
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        keyflags &= ~PRESSED_CAPSLOCK;
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        if (lockflags & LOCKED_CAPSLOCK)
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            lockflags &= ~LOCKED_CAPSLOCK;
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        else
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            lockflags |= LOCKED_CAPSLOCK;
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        break;
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        default:
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        break;
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    }
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    spinlock_unlock(&keylock);
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}
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/** Process keypress.
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 *
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 * @param sc Scancode of the key being pressed.
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 */
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void key_pressed(__u8 sc)
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{
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    char *map = sc_primary_map;
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    char ascii = sc_primary_map[sc];
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    bool shift, capslock;
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    bool letter = false;
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    spinlock_lock(&keylock);
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    switch (sc) {
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        case SC_LSHIFT:
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        case SC_RSHIFT:
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            keyflags |= PRESSED_SHIFT;
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        break;
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        case SC_CAPSLOCK:
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        keyflags |= PRESSED_CAPSLOCK;
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        break;
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        default:
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            letter = (ascii >= 'a') && (ascii <= 'z');
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        capslock = (keyflags & PRESSED_CAPSLOCK) || (lockflags & LOCKED_CAPSLOCK);
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        shift = keyflags & PRESSED_SHIFT;
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        if (letter && capslock)
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            shift = !shift;
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        if (shift)
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            map = sc_secondary_map;
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        putchar(map[sc]);
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        break;
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    }
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    spinlock_unlock(&keylock);
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}