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
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
|
#include <linux/keyboard.h>
#include <../drivers/char/defkeymap.c> /* yeah I know it's bad -- Cort */
unsigned char shfts, ctls, alts, caps;
#define KBDATAP 0x60 /* kbd data port */
#define KBSTATUSPORT 0x61 /* kbd status */
#define KBSTATP 0x64 /* kbd status port */
#define KBINRDY 0x01
#define KBOUTRDY 0x02
static int kbd(int noblock)
{
unsigned char dt, brk, val;
unsigned code;
loop:
if (noblock) {
if ((inb(KBSTATP) & KBINRDY) == 0)
return (-1);
} else while((inb(KBSTATP) & KBINRDY) == 0) ;
dt = inb(KBDATAP);
brk = dt & 0x80; /* brk == 1 on key release */
dt = dt & 0x7f; /* keycode */
if (shfts)
code = shift_map[dt];
else if (ctls)
code = ctrl_map[dt];
else
code = plain_map[dt];
val = KVAL(code);
switch (KTYP(code) & 0x0f) {
case KT_LATIN:
if (brk)
break;
if (alts)
val |= 0x80;
if (val == 0x7f) /* map delete to backspace */
val = '\b';
return val;
case KT_LETTER:
if (brk)
break;
if (caps)
val -= 'a'-'A';
return val;
case KT_SPEC:
if (brk)
break;
if (val == KVAL(K_CAPS))
caps = !caps;
else if (val == KVAL(K_ENTER)) {
enter: /* Wait for key up */
while (1) {
while((inb(KBSTATP) & KBINRDY) == 0) ;
dt = inb(KBDATAP);
if (dt & 0x80) /* key up */ break;
}
return 10;
}
break;
case KT_PAD:
if (brk)
break;
if (val < 10)
return val;
if (val == KVAL(K_PENTER))
goto enter;
break;
case KT_SHIFT:
switch (val) {
case KG_SHIFT:
case KG_SHIFTL:
case KG_SHIFTR:
shfts = brk ? 0 : 1;
break;
case KG_ALT:
case KG_ALTGR:
alts = brk ? 0 : 1;
break;
case KG_CTRL:
case KG_CTRLL:
case KG_CTRLR:
ctls = brk ? 0 : 1;
break;
}
break;
case KT_LOCK:
switch (val) {
case KG_SHIFT:
case KG_SHIFTL:
case KG_SHIFTR:
if (brk)
shfts = !shfts;
break;
case KG_ALT:
case KG_ALTGR:
if (brk)
alts = !alts;
break;
case KG_CTRL:
case KG_CTRLL:
case KG_CTRLR:
if (brk)
ctls = !ctls;
break;
}
break;
}
if (brk) return (-1); /* Ignore initial 'key up' codes */
goto loop;
}
static void kbdreset(void)
{
unsigned char c;
int i;
/* flush input queue */
while ((inb(KBSTATP) & KBINRDY))
{
(void)inb(KBDATAP);
}
/* Send self-test */
while (inb(KBSTATP) & KBOUTRDY) ;
outb(KBSTATP,0xAA);
while ((inb(KBSTATP) & KBINRDY) == 0) ; /* wait input ready */
if ((c = inb(KBDATAP)) != 0x55)
{
puts("Keyboard self test failed - result:");
puthex(c);
puts("\n");
}
/* Enable interrupts and keyboard controller */
while (inb(KBSTATP) & KBOUTRDY) ;
outb(KBSTATP,0x60);
while (inb(KBSTATP) & KBOUTRDY) ;
outb(KBDATAP,0x45);
for (i = 0; i < 10000; i++) udelay(1);
while (inb(KBSTATP) & KBOUTRDY) ;
outb(KBSTATP,0x20);
while ((inb(KBSTATP) & KBINRDY) == 0) ; /* wait input ready */
if (! (inb(KBDATAP) & 0x40)) {
/*
* Quote from PS/2 System Reference Manual:
*
* "Address hex 0060 and address hex 0064 should be
* written only when the input-buffer-full bit and
* output-buffer-full bit in the Controller Status
* register are set 0." (KBINRDY and KBOUTRDY)
*/
while (inb(KBSTATP) & (KBINRDY | KBOUTRDY)) ;
outb(KBDATAP,0xF0);
while (inb(KBSTATP) & (KBINRDY | KBOUTRDY)) ;
outb(KBDATAP,0x01);
}
while (inb(KBSTATP) & KBOUTRDY) ;
outb(KBSTATP,0xAE);
}
/* We have to actually read the keyboard when CRT_tstc is called,
* since the pending data might be a key release code, and therefore
* not valid data. In this case, kbd() will return -1, even though there's
* data to be read. Of course, we might actually read a valid key press,
* in which case it gets queued into key_pending for use by CRT_getc.
*/
static int kbd_reset = 0;
static int key_pending = -1;
int CRT_getc(void)
{
int c;
if (!kbd_reset) {kbdreset(); kbd_reset++; }
if (key_pending != -1) {
c = key_pending;
key_pending = -1;
return c;
} else {
while ((c = kbd(0)) == 0) ;
return c;
}
}
int CRT_tstc(void)
{
if (!kbd_reset) {kbdreset(); kbd_reset++; }
while (key_pending == -1 && ((inb(KBSTATP) & KBINRDY) != 0)) {
key_pending = kbd(1);
}
return (key_pending != -1);
}
|
