2 * This file is part of the libpayload project.
4 * Copyright (C) 2008 Advanced Micro Devices, Inc.
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. 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 * 3. The name of the author may not be used to endorse or promote products
15 * derived from this software without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 #include <libpayload.h>
32 #define I8042_CMD_READ_MODE 0x20
33 #define I8042_CMD_WRITE_MODE 0x60
35 #define I8042_MODE_XLATE 0x40
37 unsigned char map[2][0x57] = {
39 0x00, 0x1B, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36,
40 0x37, 0x38, 0x39, 0x30, 0x2D, 0x3D, 0x08, 0x09,
41 0x71, 0x77, 0x65, 0x72, 0x74, 0x79, 0x75, 0x69,
42 0x6F, 0x70, 0x5B, 0x5D, 0x0A, 0x00, 0x61, 0x73,
43 0x64, 0x66, 0x67, 0x68, 0x6A, 0x6B, 0x6C, 0x3B,
44 0x27, 0x60, 0x00, 0x5C, 0x7A, 0x78, 0x63, 0x76,
45 0x62, 0x6E, 0x6D, 0x2C, 0x2E, 0x2F, 0x00, 0x2A,
49 0x00, 0x1B, 0x21, 0x40, 0x23, 0x24, 0x25, 0x5E,
50 0x26, 0x2A, 0x28, 0x29, 0x5F, 0x2B, 0x08, 0x00,
51 0x51, 0x57, 0x45, 0x52, 0x54, 0x59, 0x55, 0x49,
52 0x4F, 0x50, 0x7B, 0x7D, 0x0A, 0x00, 0x41, 0x53,
53 0x44, 0x46, 0x47, 0x48, 0x4A, 0x4B, 0x4C, 0x3A,
54 0x22, 0x7E, 0x00, 0x7C, 0x5A, 0x58, 0x43, 0x56,
55 0x42, 0x4E, 0x4D, 0x3C, 0x3E, 0x3F, 0x00, 0x2A,
62 #define MOD_CAPSLOCK 4
64 int keyboard_havechar(void)
66 unsigned char c = inb(0x64);
70 unsigned char keyboard_get_scancode(void)
74 if (keyboard_havechar())
80 int keyboard_getchar(void)
87 while (!keyboard_havechar()) ;
89 ch = keyboard_get_scancode();
94 modifier &= ~MOD_SHIFT;
98 modifier |= MOD_SHIFT;
101 modifier &= ~MOD_CTRL;
104 modifier |= MOD_CTRL;
107 if (modifier & MOD_CAPSLOCK)
108 modifier &= ~MOD_CAPSLOCK;
110 modifier |= MOD_CAPSLOCK;
114 if (!(ch & 0x80) && ch < 0x57) {
116 (modifier & MOD_SHIFT) ^ (modifier & MOD_CAPSLOCK) ? 1 : 0;
117 ret = map[shift][ch];
119 if (modifier & MOD_CTRL)
120 ret = (ret >= 0x3F && ret <= 0x5F) ? ret & 0x1f : 0;
128 static int keyboard_wait_read(void)
132 while(timeout-- && !(inb(0x64) & 0x01))
135 return (timeout <= 0) ? -1 : 0;
138 static int keyboard_wait_write(void)
142 while(timeout-- && (inb(0x64) & 0x02))
145 return (timeout <= 0) ? -1 : 0;
148 static unsigned char keyboard_get_mode(void)
150 outb(I8042_CMD_READ_MODE, 0x64);
151 keyboard_wait_read();
155 static void keyboard_set_mode(unsigned char mode)
157 outb(I8042_CMD_WRITE_MODE, 0x64);
158 keyboard_wait_write();
162 void keyboard_init(void)
166 /* Read the current mode */
167 mode = keyboard_get_mode();
169 /* Turn on scancode translate mode so that we can
170 use the scancode set 1 tables */
172 mode |= I8042_MODE_XLATE;
174 /* Write the new mode */
175 keyboard_set_mode(mode);