source: mainline/arch/ia32/src/drivers/i8042.c@ 4457455

lfn serial ticket/834-toolchain-update topic/msim-upgrade topic/simplify-dev-export
Last change on this file since 4457455 was ff3b3197, checked in by Jakub Jermar <jakub@…>, 20 years ago

Implement basic kernel console command recognition.
Commands without arguments are now recognized.
  • Property mode set to 100644
File size: 8.1 KB
Line 
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
42/**
43 * i8042 processor driver.
44 * It takes care of low-level keyboard functions.
45 */
46
47#define i8042_DATA 0x60
48#define i8042_STATUS 0x64
49
50/** Keyboard commands. */
51#define KBD_ENABLE 0xf4
52#define KBD_DISABLE 0xf5
53#define KBD_ACK 0xfa
54
55#define SPECIAL '?'
56#define KEY_RELEASE 0x80
57
58static void key_released(__u8 sc);
59static void key_pressed(__u8 sc);
60
61#define PRESSED_SHIFT (1<<0)
62#define PRESSED_CAPSLOCK (1<<1)
63#define LOCKED_CAPSLOCK (1<<0)
64
65static spinlock_t keylock; /**< keylock protects keyflags and lockflags. */
66static volatile int keyflags; /**< Tracking of multiple keypresses. */
67static volatile int lockflags; /**< Tracking of multiple keys lockings. */
68
69static void i8042_suspend(void);
70static void i8042_resume(void);
71
72static chardev_t kbrd;
73static chardev_operations_t ops = {
74 .suspend = i8042_suspend,
75 .resume = i8042_resume
76};
77
78/** Primary meaning of scancodes. */
79static char sc_primary_map[] = {
80 SPECIAL, /* 0x00 */
81 SPECIAL, /* 0x01 - Esc */
82 '1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '-', '=',
83 SPECIAL, /* 0x0e - Backspace */
84 '\t', 'q', 'w', 'e', 'r', 't', 'y', 'u', 'i', 'o', 'p', '[', ']', '\n',
85 SPECIAL, /* 0x1d - LCtrl */
86 'a', 's', 'd', 'f', 'g', 'h', 'j', 'k', 'l', ';', '\'',
87 '`',
88 SPECIAL, /* 0x2a - LShift */
89 '\\',
90 'z', 'x', 'c', 'v', 'b', 'n', 'm', ',', '.', '/',
91 SPECIAL, /* 0x36 - RShift */
92 '*',
93 SPECIAL, /* 0x38 - LAlt */
94 ' ',
95 SPECIAL, /* 0x3a - CapsLock */
96 SPECIAL, /* 0x3b - F1 */
97 SPECIAL, /* 0x3c - F2 */
98 SPECIAL, /* 0x3d - F3 */
99 SPECIAL, /* 0x3e - F4 */
100 SPECIAL, /* 0x3f - F5 */
101 SPECIAL, /* 0x40 - F6 */
102 SPECIAL, /* 0x41 - F7 */
103 SPECIAL, /* 0x42 - F8 */
104 SPECIAL, /* 0x43 - F9 */
105 SPECIAL, /* 0x44 - F10 */
106 SPECIAL, /* 0x45 - NumLock */
107 SPECIAL, /* 0x46 - ScrollLock */
108 '7', '8', '9', '-',
109 '4', '5', '6', '+',
110 '1', '2', '3',
111 '0', '.',
112 SPECIAL, /* 0x54 - Alt-SysRq */
113 SPECIAL, /* 0x55 - F11/F12/PF1/FN */
114 SPECIAL, /* 0x56 - unlabelled key next to LAlt */
115 SPECIAL, /* 0x57 - F11 */
116 SPECIAL, /* 0x58 - F12 */
117 SPECIAL, /* 0x59 */
118 SPECIAL, /* 0x5a */
119 SPECIAL, /* 0x5b */
120 SPECIAL, /* 0x5c */
121 SPECIAL, /* 0x5d */
122 SPECIAL, /* 0x5e */
123 SPECIAL, /* 0x5f */
124 SPECIAL, /* 0x60 */
125 SPECIAL, /* 0x61 */
126 SPECIAL, /* 0x62 */
127 SPECIAL, /* 0x63 */
128 SPECIAL, /* 0x64 */
129 SPECIAL, /* 0x65 */
130 SPECIAL, /* 0x66 */
131 SPECIAL, /* 0x67 */
132 SPECIAL, /* 0x68 */
133 SPECIAL, /* 0x69 */
134 SPECIAL, /* 0x6a */
135 SPECIAL, /* 0x6b */
136 SPECIAL, /* 0x6c */
137 SPECIAL, /* 0x6d */
138 SPECIAL, /* 0x6e */
139 SPECIAL, /* 0x6f */
140 SPECIAL, /* 0x70 */
141 SPECIAL, /* 0x71 */
142 SPECIAL, /* 0x72 */
143 SPECIAL, /* 0x73 */
144 SPECIAL, /* 0x74 */
145 SPECIAL, /* 0x75 */
146 SPECIAL, /* 0x76 */
147 SPECIAL, /* 0x77 */
148 SPECIAL, /* 0x78 */
149 SPECIAL, /* 0x79 */
150 SPECIAL, /* 0x7a */
151 SPECIAL, /* 0x7b */
152 SPECIAL, /* 0x7c */
153 SPECIAL, /* 0x7d */
154 SPECIAL, /* 0x7e */
155 SPECIAL, /* 0x7f */
156};
157
158/** Secondary meaning of scancodes. */
159static char sc_secondary_map[] = {
160 SPECIAL, /* 0x00 */
161 SPECIAL, /* 0x01 - Esc */
162 '!', '@', '#', '$', '%', '^', '&', '*', '(', ')', '_', '+',
163 SPECIAL, /* 0x0e - Backspace */
164 '\t', 'Q', 'W', 'E', 'R', 'T', 'Y', 'U', 'I', 'O', 'P', '{', '}', '\n',
165 SPECIAL, /* 0x1d - LCtrl */
166 'A', 'S', 'D', 'F', 'G', 'H', 'J', 'K', 'L', ':', '"',
167 '~',
168 SPECIAL, /* 0x2a - LShift */
169 '|',
170 'Z', 'X', 'C', 'V', 'B', 'N', 'M', '<', '>', '?',
171 SPECIAL, /* 0x36 - RShift */
172 '*',
173 SPECIAL, /* 0x38 - LAlt */
174 ' ',
175 SPECIAL, /* 0x3a - CapsLock */
176 SPECIAL, /* 0x3b - F1 */
177 SPECIAL, /* 0x3c - F2 */
178 SPECIAL, /* 0x3d - F3 */
179 SPECIAL, /* 0x3e - F4 */
180 SPECIAL, /* 0x3f - F5 */
181 SPECIAL, /* 0x40 - F6 */
182 SPECIAL, /* 0x41 - F7 */
183 SPECIAL, /* 0x42 - F8 */
184 SPECIAL, /* 0x43 - F9 */
185 SPECIAL, /* 0x44 - F10 */
186 SPECIAL, /* 0x45 - NumLock */
187 SPECIAL, /* 0x46 - ScrollLock */
188 '7', '8', '9', '-',
189 '4', '5', '6', '+',
190 '1', '2', '3',
191 '0', '.',
192 SPECIAL, /* 0x54 - Alt-SysRq */
193 SPECIAL, /* 0x55 - F11/F12/PF1/FN */
194 SPECIAL, /* 0x56 - unlabelled key next to LAlt */
195 SPECIAL, /* 0x57 - F11 */
196 SPECIAL, /* 0x58 - F12 */
197 SPECIAL, /* 0x59 */
198 SPECIAL, /* 0x5a */
199 SPECIAL, /* 0x5b */
200 SPECIAL, /* 0x5c */
201 SPECIAL, /* 0x5d */
202 SPECIAL, /* 0x5e */
203 SPECIAL, /* 0x5f */
204 SPECIAL, /* 0x60 */
205 SPECIAL, /* 0x61 */
206 SPECIAL, /* 0x62 */
207 SPECIAL, /* 0x63 */
208 SPECIAL, /* 0x64 */
209 SPECIAL, /* 0x65 */
210 SPECIAL, /* 0x66 */
211 SPECIAL, /* 0x67 */
212 SPECIAL, /* 0x68 */
213 SPECIAL, /* 0x69 */
214 SPECIAL, /* 0x6a */
215 SPECIAL, /* 0x6b */
216 SPECIAL, /* 0x6c */
217 SPECIAL, /* 0x6d */
218 SPECIAL, /* 0x6e */
219 SPECIAL, /* 0x6f */
220 SPECIAL, /* 0x70 */
221 SPECIAL, /* 0x71 */
222 SPECIAL, /* 0x72 */
223 SPECIAL, /* 0x73 */
224 SPECIAL, /* 0x74 */
225 SPECIAL, /* 0x75 */
226 SPECIAL, /* 0x76 */
227 SPECIAL, /* 0x77 */
228 SPECIAL, /* 0x78 */
229 SPECIAL, /* 0x79 */
230 SPECIAL, /* 0x7a */
231 SPECIAL, /* 0x7b */
232 SPECIAL, /* 0x7c */
233 SPECIAL, /* 0x7d */
234 SPECIAL, /* 0x7e */
235 SPECIAL, /* 0x7f */
236};
237
238/** Initialize i8042. */
239void i8042_init(void)
240{
241 trap_register(VECTOR_KBD, i8042_interrupt);
242 trap_virtual_enable_irqs(1<<IRQ_KBD);
243 spinlock_initialize(&keylock);
244 chardev_initialize(&kbrd, &ops);
245 stdin = &kbrd;
246}
247
248/** Process i8042 interrupt.
249 *
250 * @param n Interrupt vector.
251 * @param stack Interrupted stack.
252 */
253void i8042_interrupt(__u8 n, __native stack[])
254{
255 __u8 x;
256
257 trap_virtual_eoi();
258 x = inb(i8042_DATA);
259 if (x & KEY_RELEASE)
260 key_released(x ^ KEY_RELEASE);
261 else
262 key_pressed(x);
263}
264
265/** Process release of key.
266 *
267 * @param sc Scancode of the key being released.
268 */
269void key_released(__u8 sc)
270{
271 spinlock_lock(&keylock);
272 switch (sc) {
273 case SC_LSHIFT:
274 case SC_RSHIFT:
275 keyflags &= ~PRESSED_SHIFT;
276 break;
277 case SC_CAPSLOCK:
278 keyflags &= ~PRESSED_CAPSLOCK;
279 if (lockflags & LOCKED_CAPSLOCK)
280 lockflags &= ~LOCKED_CAPSLOCK;
281 else
282 lockflags |= LOCKED_CAPSLOCK;
283 break;
284 default:
285 break;
286 }
287 spinlock_unlock(&keylock);
288}
289
290/** Process keypress.
291 *
292 * @param sc Scancode of the key being pressed.
293 */
294void key_pressed(__u8 sc)
295{
296 char *map = sc_primary_map;
297 char ascii = sc_primary_map[sc];
298 bool shift, capslock;
299 bool letter = false;
300
301 spinlock_lock(&keylock);
302 switch (sc) {
303 case SC_LSHIFT:
304 case SC_RSHIFT:
305 keyflags |= PRESSED_SHIFT;
306 break;
307 case SC_CAPSLOCK:
308 keyflags |= PRESSED_CAPSLOCK;
309 break;
310 default:
311 letter = is_lower(ascii);
312 capslock = (keyflags & PRESSED_CAPSLOCK) || (lockflags & LOCKED_CAPSLOCK);
313 shift = keyflags & PRESSED_SHIFT;
314 if (letter && capslock)
315 shift = !shift;
316 if (shift)
317 map = sc_secondary_map;
318 chardev_push_character(&kbrd, map[sc]);
319 break;
320 }
321 spinlock_unlock(&keylock);
322}
323
324/* Called from getc(). */
325void i8042_resume(void)
326{
327}
328
329/* Called from getc(). */
330void i8042_suspend(void)
331{
332}
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