summaryrefslogtreecommitdiff
path: root/drivers/input/keyboard.c
blob: f2a8eba095f543f4e96d481a5b9e803e4327e0d0 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
#include <kernel/input/keyboard.h>
#include <kernel/tty/tty_vga.h>
#include <kernel/tty.h>
#include <kernel/kthread.h>
#include <kernel/pic.h>
#include <libk/string.h>

static uint8_t keymap_modifiers[256] = {
        [0x1D] KB_CTL,
        [0x2A] KB_SHIFT,
        [0x36] KB_SHIFT,
        [0x38] KB_ALT,
        [0x9D] KB_CTL,
        [0xB8] KB_ALT
};

static uint8_t keymap_toggles[256] = {
        [0x3A] KB_CPSLK,
        [0x45] KB_NUMLK,
        [0x46] KB_SCLLK
};

static uint8_t keymap_normal[256] = {
        0, 0x1B, '1', '2', '3', '4', '5', '6',
        '7', '8', '9', '0', '-', '=', '\b', '\t',
        'q', 'w', 'e', 'r', 't', 'y', 'u', 'i',
        'o', 'p', '[', ']', '\n', 0, 'a', 's',
        'd', 'f', 'g', 'h', 'j', 'k', 'l', ';',
        '\'', '`', 0, '\\', 'z', 'x', 'c', 'v',
        'b', 'n', 'm', ',', '.', '/', 0, '*',
        0, ' ', 0, 0, 0, 0, 0, 0,
        0, 0, 0, 0, 0, 0, 0, '7',
        '8', '9', '-', '4', '5', '6', '+', '1',
        '2', '3', '0', '.', 0, 0, 0, 0,
        [0x9C] '\n',
        [0xB5] '/',
        [0xC8] KB_UP,
        [0xD0] KB_DOWN,
        [0xC9] KB_PGUP,
        [0xD1] KB_PGDN,
        [0xCB] KB_LEFT,
        [0xCD] KB_RGHT,
        [0x97] KB_HOME,
        [0xCF] KB_END,
        [0xD2] KB_INS,
        [0xD3] KB_DEL
};

static uint8_t keymap_shifted[256] = {
        0, 0x33, '!', '@', '#', '$', '%', '^',
        '&', '*', '(', ')', '_', '+', '\b', '\t',
        'Q', 'W', 'E', 'R', 'T', 'Y', 'U', 'I',
        'O', 'P', '{', '}', '\n', 0, 'A', 'S',
        'D', 'F', 'G', 'H', 'J', 'K', 'L', ':',
        '"', '~', 0, '|', 'Z', 'X', 'C', 'V',
        'B', 'N', 'M', '<', '>', '?', 0, '*',
        0, ' ', 0, 0, 0, 0, 0, 0,
        0, 0, 0, 0, 0, 0, 0, '7',
        '8', '9', '-', '4', '5', '6', '+', '1',
        '2', '3', '0', '.', 0, 0, 0, 0,
        [0x9C] '\n',
        [0xB5] '/',
        [0xC8] KB_UP,
        [0xD0] KB_DOWN,
        [0xC9] KB_PGUP,
        [0xD1] KB_PGDN,
        [0xCB] KB_LEFT,
        [0xCD] KB_RGHT,
        [0x97] KB_HOME,
        [0xCF] KB_END,
        [0xD2] KB_INS,
        [0xD3] KB_DEL
};

static uint8_t keymap_control[256] = {
        0, 0, 0, 0, 0, 0, 0, 0,
        0, 0, 0, 0, 0, 0, 0, 0,
        C('Q'), C('W'), C('E'), C('R'), C('T'), C('Y'), C('U'), C('I'),
        C('O'), C('P'), 0, 0, '\r', 0, C('A'), C('S'),
        C('D'), C('F'), C('G'), C('H'), C('J'), C('K'), C('L'), 0,
        0, 0, 0, C('\\'), C('Z'), C('X'), C('C'), C('V'),
        C('B'), C('N'), C('M'), 0, 0, C('/'), 0, 0,
        [0x9C] '\r',
        [0xB5] C('/'),
        [0xC8] KB_UP,
        [0xD0] KB_DOWN,
        [0xC9] KB_PGUP,
        [0xD1] KB_PGDN,
        [0xCB] KB_LEFT,
        [0xCD] KB_RGHT,
        [0x97] KB_HOME,
        [0xCF] KB_END,
        [0xD2] KB_INS,
        [0xD3] KB_DEL
};

static uint8_t* keymaps[4] = {
        keymap_normal,
        keymap_shifted,
        keymap_control,
        keymap_control,
};

char keyboard_getchar(void) {
        static int shift = 0;
        uint8_t st = inb(KB_STAT);
        if ((st & KB_DIB) == 0)
                return -1;

        uint8_t data = inb(KB_DATA);

        if (data == 0xE0) {
                shift |= KB_E0ESC;
                return -1;
        } else if (data & 0x80) {
                if (!(shift & KB_E0ESC))
                        data &= 0x7F;
                shift &= ~(keymap_modifiers[data] | KB_E0ESC);
                return -1;
        } else if (shift & KB_E0ESC) {
                data |= 0x80;
                shift &= ~KB_E0ESC;
        }

        shift |= keymap_modifiers[data];
        shift ^= keymap_toggles[data];
        char c = keymaps[shift & (KB_CTL | KB_SHIFT)][data];
        if (shift & KB_CPSLK) {
                if ('a' <= c && c <= 'z')
                        c += 'A' - 'a';
                else if ('A' <= c && c <= 'Z')
                        c += 'a' - 'A';
        }
        return c;
}

void keyboard_handler(struct isr_frame *frame) {
        char c = keyboard_getchar();
        if (c != -1)
                tty_getchar(c);
        return;
}