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1 | jermar | 1 | /* |
2 | * Copyright (C) 2001-2004 Jakub Jermar |
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3 | * All rights reserved. |
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4 | * |
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5 | * Redistribution and use in source and binary forms, with or without |
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6 | * modification, are permitted provided that the following conditions |
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7 | * are met: |
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8 | * |
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9 | * - Redistributions of source code must retain the above copyright |
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10 | * notice, this list of conditions and the following disclaimer. |
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11 | * - Redistributions in binary form must reproduce the above copyright |
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12 | * notice, this list of conditions and the following disclaimer in the |
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13 | * documentation and/or other materials provided with the distribution. |
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14 | * - The name of the author may not be used to endorse or promote products |
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15 | * derived from this software without specific prior written permission. |
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16 | * |
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17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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27 | */ |
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28 | |||
1754 | jermar | 29 | /** @addtogroup genarch |
1702 | cejka | 30 | * @{ |
31 | */ |
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1754 | jermar | 32 | /** |
1757 | jermar | 33 | * @file |
1754 | jermar | 34 | * @brief i8042 processor driver. |
35 | * |
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36 | * It takes care of low-level keyboard functions. |
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1702 | cejka | 37 | */ |
38 | |||
1842 | jermar | 39 | #include <genarch/kbd/i8042.h> |
40 | #include <genarch/kbd/scanc.h> |
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41 | #include <genarch/kbd/scanc_pc.h> |
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894 | jermar | 42 | #include <arch/drivers/i8042.h> |
1 | jermar | 43 | #include <arch/interrupt.h> |
44 | #include <cpu.h> |
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45 | #include <arch/asm.h> |
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46 | #include <arch.h> |
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508 | jermar | 47 | #include <synch/spinlock.h> |
48 | #include <typedefs.h> |
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511 | jermar | 49 | #include <console/chardev.h> |
50 | #include <console/console.h> |
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517 | jermar | 51 | #include <macros.h> |
576 | palkovsky | 52 | #include <interrupt.h> |
1 | jermar | 53 | |
1754 | jermar | 54 | /* Keyboard commands. */ |
512 | jermar | 55 | #define KBD_ENABLE 0xf4 |
56 | #define KBD_DISABLE 0xf5 |
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57 | #define KBD_ACK 0xfa |
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58 | |||
670 | vana | 59 | /* |
893 | jermar | 60 | * 60 Write 8042 Command Byte: next data byte written to port 60h is |
895 | jermar | 61 | * placed in 8042 command register. Format: |
893 | jermar | 62 | * |
63 | * |7|6|5|4|3|2|1|0|8042 Command Byte |
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64 | * | | | | | | | `---- 1=enable output register full interrupt |
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65 | * | | | | | | `----- should be 0 |
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66 | * | | | | | `------ 1=set status register system, 0=clear |
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67 | * | | | | `------- 1=override keyboard inhibit, 0=allow inhibit |
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68 | * | | | `-------- disable keyboard I/O by driving clock line low |
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69 | * | | `--------- disable auxiliary device, drives clock line low |
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70 | * | `---------- IBM scancode translation 0=AT, 1=PC/XT |
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71 | * `----------- reserved, should be 0 |
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72 | */ |
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670 | vana | 73 | |
893 | jermar | 74 | #define i8042_SET_COMMAND 0x60 |
1759 | palkovsky | 75 | #define i8042_COMMAND 0x69 |
894 | jermar | 76 | |
77 | #define i8042_BUFFER_FULL_MASK 0x01 |
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893 | jermar | 78 | #define i8042_WAIT_MASK 0x02 |
1759 | palkovsky | 79 | #define i8042_MOUSE_DATA 0x20 |
670 | vana | 80 | |
508 | jermar | 81 | #define KEY_RELEASE 0x80 |
82 | |||
1780 | jermar | 83 | static void key_released(uint8_t sc); |
84 | static void key_pressed(uint8_t sc); |
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878 | vana | 85 | static char key_read(chardev_t *d); |
508 | jermar | 86 | |
87 | #define PRESSED_SHIFT (1<<0) |
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88 | #define PRESSED_CAPSLOCK (1<<1) |
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89 | #define LOCKED_CAPSLOCK (1<<0) |
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90 | |||
894 | jermar | 91 | #define ACTIVE_READ_BUFF_SIZE 16 /* Must be power of 2 */ |
878 | vana | 92 | |
1780 | jermar | 93 | static uint8_t active_read_buff[ACTIVE_READ_BUFF_SIZE]; |
878 | vana | 94 | |
623 | jermar | 95 | SPINLOCK_INITIALIZE(keylock); /**< keylock protects keyflags and lockflags. */ |
508 | jermar | 96 | static volatile int keyflags; /**< Tracking of multiple keypresses. */ |
509 | jermar | 97 | static volatile int lockflags; /**< Tracking of multiple keys lockings. */ |
508 | jermar | 98 | |
575 | palkovsky | 99 | static void i8042_suspend(chardev_t *); |
100 | static void i8042_resume(chardev_t *); |
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511 | jermar | 101 | |
102 | static chardev_t kbrd; |
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103 | static chardev_operations_t ops = { |
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104 | .suspend = i8042_suspend, |
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878 | vana | 105 | .resume = i8042_resume, |
106 | .read = key_read |
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511 | jermar | 107 | }; |
108 | |||
958 | jermar | 109 | static void i8042_interrupt(int n, istate_t *istate); |
895 | jermar | 110 | static void i8042_wait(void); |
576 | palkovsky | 111 | |
1474 | palkovsky | 112 | static iroutine oldvector; |
113 | /** Initialize keyboard and service interrupts using kernel routine */ |
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114 | void i8042_grab(void) |
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1 | jermar | 115 | { |
1474 | palkovsky | 116 | oldvector = exc_register(VECTOR_KBD, "i8042_interrupt", (iroutine) i8042_interrupt); |
895 | jermar | 117 | i8042_wait(); |
894 | jermar | 118 | i8042_command_write(i8042_SET_COMMAND); |
895 | jermar | 119 | i8042_wait(); |
894 | jermar | 120 | i8042_data_write(i8042_COMMAND); |
895 | jermar | 121 | i8042_wait(); |
1474 | palkovsky | 122 | } |
123 | /** Resume the former interrupt vector */ |
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124 | void i8042_release(void) |
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125 | { |
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126 | if (oldvector) |
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127 | exc_register(VECTOR_KBD, "user_interrupt", oldvector); |
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128 | } |
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670 | vana | 129 | |
1474 | palkovsky | 130 | /** Initialize i8042. */ |
131 | void i8042_init(void) |
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132 | { |
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133 | int i; |
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134 | |||
135 | i8042_grab(); |
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136 | /* Prevent user from accidentaly releasing calling i8042_resume |
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137 | * and disabling keyboard |
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138 | */ |
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139 | oldvector = NULL; |
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140 | |||
512 | jermar | 141 | trap_virtual_enable_irqs(1<<IRQ_KBD); |
575 | palkovsky | 142 | chardev_initialize("i8042_kbd", &kbrd, &ops); |
511 | jermar | 143 | stdin = &kbrd; |
1195 | jermar | 144 | |
1194 | vana | 145 | /* |
1195 | jermar | 146 | * Clear input buffer. |
147 | * Number of iterations is limited to prevent infinite looping. |
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148 | */ |
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149 | for (i = 0; (i8042_status_read() & i8042_BUFFER_FULL_MASK) && i < 100; i++) { |
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1194 | vana | 150 | i8042_data_read(); |
1195 | jermar | 151 | } |
1 | jermar | 152 | } |
153 | |||
508 | jermar | 154 | /** Process i8042 interrupt. |
155 | * |
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156 | * @param n Interrupt vector. |
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1708 | jermar | 157 | * @param istate Interrupted state. |
508 | jermar | 158 | */ |
958 | jermar | 159 | void i8042_interrupt(int n, istate_t *istate) |
1 | jermar | 160 | { |
1780 | jermar | 161 | uint8_t x; |
162 | uint8_t status; |
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1 | jermar | 163 | |
1759 | palkovsky | 164 | while (((status=i8042_status_read()) & i8042_BUFFER_FULL_MASK)) { |
1753 | palkovsky | 165 | x = i8042_data_read(); |
1759 | palkovsky | 166 | |
167 | if ((status & i8042_MOUSE_DATA)) |
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168 | continue; |
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169 | |||
1753 | palkovsky | 170 | if (x & KEY_RELEASE) |
171 | key_released(x ^ KEY_RELEASE); |
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172 | else |
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173 | key_pressed(x); |
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174 | } |
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1 | jermar | 175 | trap_virtual_eoi(); |
176 | } |
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508 | jermar | 177 | |
895 | jermar | 178 | /** Wait until the controller reads its data. */ |
179 | void i8042_wait(void) { |
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180 | while (i8042_status_read() & i8042_WAIT_MASK) { |
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181 | /* wait */ |
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182 | } |
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183 | } |
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184 | |||
508 | jermar | 185 | /** Process release of key. |
186 | * |
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187 | * @param sc Scancode of the key being released. |
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188 | */ |
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1780 | jermar | 189 | void key_released(uint8_t sc) |
508 | jermar | 190 | { |
191 | spinlock_lock(&keylock); |
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192 | switch (sc) { |
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193 | case SC_LSHIFT: |
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194 | case SC_RSHIFT: |
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195 | keyflags &= ~PRESSED_SHIFT; |
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196 | break; |
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197 | case SC_CAPSLOCK: |
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198 | keyflags &= ~PRESSED_CAPSLOCK; |
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199 | if (lockflags & LOCKED_CAPSLOCK) |
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200 | lockflags &= ~LOCKED_CAPSLOCK; |
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201 | else |
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202 | lockflags |= LOCKED_CAPSLOCK; |
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203 | break; |
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204 | default: |
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205 | break; |
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206 | } |
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207 | spinlock_unlock(&keylock); |
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208 | } |
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209 | |||
210 | /** Process keypress. |
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211 | * |
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212 | * @param sc Scancode of the key being pressed. |
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213 | */ |
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1780 | jermar | 214 | void key_pressed(uint8_t sc) |
508 | jermar | 215 | { |
216 | char *map = sc_primary_map; |
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217 | char ascii = sc_primary_map[sc]; |
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218 | bool shift, capslock; |
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219 | bool letter = false; |
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220 | |||
221 | spinlock_lock(&keylock); |
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222 | switch (sc) { |
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601 | palkovsky | 223 | case SC_LSHIFT: |
224 | case SC_RSHIFT: |
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508 | jermar | 225 | keyflags |= PRESSED_SHIFT; |
226 | break; |
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601 | palkovsky | 227 | case SC_CAPSLOCK: |
508 | jermar | 228 | keyflags |= PRESSED_CAPSLOCK; |
229 | break; |
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601 | palkovsky | 230 | case SC_SPEC_ESCAPE: |
231 | break; |
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232 | case SC_LEFTARR: |
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233 | chardev_push_character(&kbrd, 0x1b); |
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234 | chardev_push_character(&kbrd, 0x5b); |
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235 | chardev_push_character(&kbrd, 0x44); |
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236 | break; |
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237 | case SC_RIGHTARR: |
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238 | chardev_push_character(&kbrd, 0x1b); |
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239 | chardev_push_character(&kbrd, 0x5b); |
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240 | chardev_push_character(&kbrd, 0x43); |
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241 | break; |
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242 | case SC_UPARR: |
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243 | chardev_push_character(&kbrd, 0x1b); |
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244 | chardev_push_character(&kbrd, 0x5b); |
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245 | chardev_push_character(&kbrd, 0x41); |
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246 | break; |
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247 | case SC_DOWNARR: |
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248 | chardev_push_character(&kbrd, 0x1b); |
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249 | chardev_push_character(&kbrd, 0x5b); |
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250 | chardev_push_character(&kbrd, 0x42); |
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251 | break; |
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606 | palkovsky | 252 | case SC_HOME: |
253 | chardev_push_character(&kbrd, 0x1b); |
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254 | chardev_push_character(&kbrd, 0x4f); |
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255 | chardev_push_character(&kbrd, 0x48); |
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256 | break; |
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257 | case SC_END: |
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258 | chardev_push_character(&kbrd, 0x1b); |
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259 | chardev_push_character(&kbrd, 0x4f); |
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260 | chardev_push_character(&kbrd, 0x46); |
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261 | break; |
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262 | case SC_DELETE: |
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263 | chardev_push_character(&kbrd, 0x1b); |
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264 | chardev_push_character(&kbrd, 0x5b); |
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265 | chardev_push_character(&kbrd, 0x33); |
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266 | chardev_push_character(&kbrd, 0x7e); |
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267 | break; |
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601 | palkovsky | 268 | default: |
517 | jermar | 269 | letter = is_lower(ascii); |
508 | jermar | 270 | capslock = (keyflags & PRESSED_CAPSLOCK) || (lockflags & LOCKED_CAPSLOCK); |
271 | shift = keyflags & PRESSED_SHIFT; |
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272 | if (letter && capslock) |
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273 | shift = !shift; |
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274 | if (shift) |
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275 | map = sc_secondary_map; |
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511 | jermar | 276 | chardev_push_character(&kbrd, map[sc]); |
508 | jermar | 277 | break; |
278 | } |
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279 | spinlock_unlock(&keylock); |
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280 | } |
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511 | jermar | 281 | |
282 | /* Called from getc(). */ |
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575 | palkovsky | 283 | void i8042_resume(chardev_t *d) |
511 | jermar | 284 | { |
285 | } |
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286 | |||
287 | /* Called from getc(). */ |
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575 | palkovsky | 288 | void i8042_suspend(chardev_t *d) |
511 | jermar | 289 | { |
290 | } |
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878 | vana | 291 | |
1780 | jermar | 292 | static uint8_t active_read_buff_read(void) |
878 | vana | 293 | { |
294 | static int i=0; |
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894 | jermar | 295 | i &= (ACTIVE_READ_BUFF_SIZE-1); |
296 | if(!active_read_buff[i]) { |
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878 | vana | 297 | return 0; |
298 | } |
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299 | return active_read_buff[i++]; |
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300 | } |
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301 | |||
1780 | jermar | 302 | static void active_read_buff_write(uint8_t ch) |
878 | vana | 303 | { |
304 | static int i=0; |
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894 | jermar | 305 | active_read_buff[i] = ch; |
878 | vana | 306 | i++; |
894 | jermar | 307 | i &= (ACTIVE_READ_BUFF_SIZE-1); |
878 | vana | 308 | active_read_buff[i]=0; |
309 | } |
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310 | |||
311 | |||
1780 | jermar | 312 | static void active_read_key_pressed(uint8_t sc) |
878 | vana | 313 | { |
314 | char *map = sc_primary_map; |
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315 | char ascii = sc_primary_map[sc]; |
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316 | bool shift, capslock; |
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317 | bool letter = false; |
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318 | |||
319 | /*spinlock_lock(&keylock);*/ |
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320 | switch (sc) { |
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321 | case SC_LSHIFT: |
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322 | case SC_RSHIFT: |
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323 | keyflags |= PRESSED_SHIFT; |
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324 | break; |
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325 | case SC_CAPSLOCK: |
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326 | keyflags |= PRESSED_CAPSLOCK; |
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327 | break; |
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328 | case SC_SPEC_ESCAPE: |
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329 | break; |
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330 | case SC_LEFTARR: |
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331 | active_read_buff_write(0x1b); |
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332 | active_read_buff_write(0x5b); |
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333 | active_read_buff_write(0x44); |
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334 | break; |
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335 | case SC_RIGHTARR: |
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336 | active_read_buff_write(0x1b); |
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337 | active_read_buff_write(0x5b); |
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338 | active_read_buff_write(0x43); |
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339 | break; |
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340 | case SC_UPARR: |
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341 | active_read_buff_write(0x1b); |
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342 | active_read_buff_write(0x5b); |
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343 | active_read_buff_write(0x41); |
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344 | break; |
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345 | case SC_DOWNARR: |
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346 | active_read_buff_write(0x1b); |
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347 | active_read_buff_write(0x5b); |
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348 | active_read_buff_write(0x42); |
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349 | break; |
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350 | case SC_HOME: |
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351 | active_read_buff_write(0x1b); |
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352 | active_read_buff_write(0x4f); |
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353 | active_read_buff_write(0x48); |
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354 | break; |
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355 | case SC_END: |
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356 | active_read_buff_write(0x1b); |
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357 | active_read_buff_write(0x4f); |
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358 | active_read_buff_write(0x46); |
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359 | break; |
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360 | case SC_DELETE: |
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361 | active_read_buff_write(0x1b); |
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362 | active_read_buff_write(0x5b); |
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363 | active_read_buff_write(0x33); |
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364 | active_read_buff_write(0x7e); |
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365 | break; |
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366 | default: |
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367 | letter = is_lower(ascii); |
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368 | capslock = (keyflags & PRESSED_CAPSLOCK) || (lockflags & LOCKED_CAPSLOCK); |
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369 | shift = keyflags & PRESSED_SHIFT; |
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370 | if (letter && capslock) |
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371 | shift = !shift; |
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372 | if (shift) |
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373 | map = sc_secondary_map; |
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374 | active_read_buff_write(map[sc]); |
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375 | break; |
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376 | } |
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377 | /*spinlock_unlock(&keylock);*/ |
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378 | |||
379 | } |
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380 | |||
381 | static char key_read(chardev_t *d) |
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382 | { |
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383 | char ch; |
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384 | |||
894 | jermar | 385 | while(!(ch = active_read_buff_read())) { |
1780 | jermar | 386 | uint8_t x; |
1753 | palkovsky | 387 | while (!(i8042_status_read() & i8042_BUFFER_FULL_MASK)) |
894 | jermar | 388 | ; |
389 | x = i8042_data_read(); |
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1842 | jermar | 390 | if (x & KEY_RELEASE) |
391 | key_released(x ^ KEY_RELEASE); |
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392 | else |
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393 | active_read_key_pressed(x); |
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878 | vana | 394 | } |
395 | return ch; |
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396 | } |
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895 | jermar | 397 | |
398 | /** Poll for key press and release events. |
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399 | * |
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400 | * This function can be used to implement keyboard polling. |
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401 | */ |
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402 | void i8042_poll(void) |
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403 | { |
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1780 | jermar | 404 | uint8_t x; |
895 | jermar | 405 | |
406 | while (((x = i8042_status_read() & i8042_BUFFER_FULL_MASK))) { |
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407 | x = i8042_data_read(); |
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1842 | jermar | 408 | if (x & KEY_RELEASE) |
409 | key_released(x ^ KEY_RELEASE); |
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410 | else |
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411 | key_pressed(x); |
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895 | jermar | 412 | } |
413 | } |
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1702 | cejka | 414 | |
1754 | jermar | 415 | /** @} |
1702 | cejka | 416 | */ |