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
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
|
#include <assert.h>
#include <cpu/idt.h>
#include <drivers/keyboard.h>
#include <errno.h>
#include <fs/devfs.h>
#include <fs/fifo.h>
#include <fs/vfs.h>
#include <lib/ringbuffer.h>
#include <sched/scheduler.h>
#include <typedefs.h>
#define PS2_REG_DATA 0x60
#define PS2_REG_STATUS 0x64
#define PS2_REG_COMMAND 0x64
#define PS2_CMD_ENABLE_FIRST_PORT 0xAE // no rsp
#define PS2_CMD_TEST_CONTROLLER 0xAA // has rsp
#define PS2_RSP_TEST_PASSED 0x55
#define PS2_RSP_TEST_FAILED 0xFC
#define PS2_CMD_SET_SCANCODE 0xF0 // has rsp
#define PS2_KB_ACK 0xFA
#define PS2_KB_RESEND 0xFE
#define PS2_CMD_SET_MAKE_RELEASE 0xF8 // has rsp
u8 kb_scancodes[3] = {0x43, 0x41, 0x3f};
u8 ascii_table[] = {
'e', '\x1B', '1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '-', '=', 8,
'\t',
'q', 'w', 'e', 'r', 't', 'y', 'u', 'i', 'o', 'p',
// 0, // [
// 0, // ]
// 0,
// 0, // ?
'[', ']',
'\n', // ENTER
'C',
'a', 's', 'd', 'f', 'g', 'h', 'j', 'k', 'l',
';', // ;
'\'', // ;
'`', // ;
'D', // LEFT SHIFT
'\\', // ;
'z', 'x', 'c', 'v', 'b', 'n', 'm',
',', // ;
'.', // ;
'/', // ;
'U', // ;
'U', // ;
'U', // ;
' ', // ;
};
u8 capital_ascii_table[] = {
'e', '\x1B', '!', '@', '#', '$', '%', '^', '&', '*', '(', ')', '_', '+', 8,
'\t',
'Q', 'W', 'E', 'R', 'T', 'Y', 'U', 'I', 'O', 'P',
// 0, // [
// 0, // ]
// 0,
// 0, // ?
'{', '}',
'\n', // ENTER
'C',
'A', 'S', 'D', 'F', 'G', 'H', 'J', 'K', 'L',
':', // ;
'\"', // ;
'~', // ;
'D', // LEFT SHIFT
'\\', // ;
'Z', 'X', 'C', 'V', 'B', 'N', 'M',
'<', // ;
'>', // ;
'?', // ;
'U', // ;
'U', // ;
'U', // ;
' ', // ;
};
vfs_inode_t *kb_inode = NULL;
u8 keyboard_to_ascii(u16 key, u8 capital) {
if ((key & 0xFF) > sizeof(ascii_table)) {
return 'U';
}
if (capital) {
return capital_ascii_table[key & 0xFF];
} else {
return ascii_table[key & 0xFF];
}
}
u8 is_shift_down = 0;
u8 is_alt_down = 0;
u8 is_ctrl_down = 0;
struct KEY_EVENT {
char c;
u8 mode; // (shift (0 bit)) (alt (1 bit)) (ctrl (2 bit))
u8 release; // 0 pressed, 1 released
};
extern process_t *ready_queue;
void int_keyboard(reg_t *frame) {
u16 c;
c = inb(PS2_REG_DATA);
outb(0x20, 0x20);
if (!kb_inode) {
return;
}
int released = 0;
if (c & 0x80) {
switch ((c & ~(0x80)) & 0xFF) {
case 0x2A: // Left shift
case 0x36: // Right shift
is_shift_down = 0;
return;
case 0x38:
is_alt_down = 0;
return;
case 0x1D:
is_ctrl_down = 0;
return;
}
released = 1;
} else {
switch (c & 0xFF) {
case 0x2A: // Left shift
case 0x36: // Right shift
is_shift_down = 1;
return;
case 0x38:
is_alt_down = 1;
return;
case 0x1D:
is_ctrl_down = 1;
return;
}
released = 0;
}
unsigned char a = keyboard_to_ascii((c & ~(0x80)) & 0xFF, is_shift_down);
struct KEY_EVENT ev;
ev.c = a;
ev.release = released;
ev.mode = 0;
ev.mode |= is_shift_down << 0;
ev.mode |= is_alt_down << 1;
ev.mode |= is_ctrl_down << 2;
ringbuffer_write(kb_inode->internal_object, (u8 *)&ev, sizeof(ev));
}
int keyboard_has_data(vfs_inode_t *inode) {
const struct ringbuffer *rb = inode->internal_object;
return !ringbuffer_isempty(rb);
}
void install_keyboard(void) {
install_handler(int_keyboard, INT_32_INTERRUPT_GATE(0x3), 0x21);
}
int keyboard_read(u8 *buffer, u64 offset, u64 len, vfs_fd_t *fd) {
(void)offset;
struct ringbuffer *rb = fd->inode->internal_object;
u32 rc = ringbuffer_read(rb, buffer, len);
if (0 == rc && len > 0) {
return -EAGAIN;
}
return rc;
}
void add_keyboard(void) {
kb_inode = devfs_add_file("/keyboard", keyboard_read, NULL, NULL,
keyboard_has_data, NULL, FS_TYPE_CHAR_DEVICE);
kb_inode->internal_object = kmalloc(sizeof(struct ringbuffer));
ringbuffer_init(kb_inode->internal_object, 128);
}
|
