1 /*-
2 * Copyright (c) 1990, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * William Jolitz.
7 *
8 * %sccs.include.redist.c%
9 *
10 * @(#)kbd.c 8.1 (Berkeley) 06/11/93
11 */
12
13 #define L 0x01 /* locking function */
14 #define SHF 0x02 /* keyboard shift */
15 #define ALT 0x04 /* alternate shift -- alternate chars */
16 #define NUM 0x08 /* numeric shift cursors vs. numeric */
17 #define CTL 0x10 /* control shift -- allows ctl function */
18 #define CPS 0x20 /* caps shift -- swaps case of letter */
19 #define ASCII 0x40 /* ascii code for this key */
20 #define STP 0x80 /* stop output */
21
22 typedef unsigned char u_char;
23
24 u_char inb();
25
26 u_char action[] = {
27 0, ASCII, ASCII, ASCII, ASCII, ASCII, ASCII, ASCII, /* scan 0- 7 */
28 ASCII, ASCII, ASCII, ASCII, ASCII, ASCII, ASCII, ASCII, /* scan 8-15 */
29 ASCII, ASCII, ASCII, ASCII, ASCII, ASCII, ASCII, ASCII, /* scan 16-23 */
30 ASCII, ASCII, ASCII, ASCII, ASCII, CTL, ASCII, ASCII, /* scan 24-31 */
31 ASCII, ASCII, ASCII, ASCII, ASCII, ASCII, ASCII, ASCII, /* scan 32-39 */
32 ASCII, ASCII, SHF , ASCII, ASCII, ASCII, ASCII, ASCII, /* scan 40-47 */
33 ASCII, ASCII, ASCII, ASCII, ASCII, ASCII, SHF, ASCII, /* scan 48-55 */
34 ALT, ASCII, CPS|L, 0, 0, ASCII, 0, 0, /* scan 56-63 */
35 0, 0, 0, 0, 0, NUM|L, STP|L, ASCII, /* scan 64-71 */
36 ASCII, ASCII, ASCII, ASCII, ASCII, ASCII, ASCII, ASCII, /* scan 72-79 */
37 ASCII, ASCII, ASCII, ASCII, 0, 0, 0, 0, /* scan 80-87 */
38 0,0,0,0,0,0,0,0,
39 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,
40 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, } ;
41
42 u_char unshift[] = { /* no shift */
43 0, 033 , '1' , '2' , '3' , '4' , '5' , '6' , /* scan 0- 7 */
44 '7' , '8' , '9' , '0' , '-' , '=' , 0177 ,'\t' , /* scan 8-15 */
45
46 'q' , 'w' , 'e' , 'r' , 't' , 'y' , 'u' , 'i' , /* scan 16-23 */
47 'o' , 'p' , '[' , ']' , '\r' , CTL , 'a' , 's' , /* scan 24-31 */
48
49 'd' , 'f' , 'g' , 'h' , 'j' , 'k' , 'l' , ';' , /* scan 32-39 */
50 '\'' , '`' , SHF , '\\' , 'z' , 'x' , 'c' , 'v' , /* scan 40-47 */
51
52 'b' , 'n' , 'm' , ',' , '.' , '/' , SHF , '*', /* scan 48-55 */
53 ALT , ' ' , CPS|L, 0, 0, ' ' , 0, 0, /* scan 56-63 */
54
55 0, 0, 0, 0, 0, NUM|L, STP|L, '7', /* scan 64-71 */
56 '8', '9', '-', '4', '5', '6', '+', '1', /* scan 72-79 */
57
58 '2', '3', '0', '.', 0, 0, 0, 0, /* scan 80-87 */
59 0,0,0,0,0,0,0,0,
60 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,
61 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, } ;
62
63 u_char shift[] = { /* shift shift */
64 0, 033 , '!' , '@' , '#' , '$' , '%' , '^' , /* scan 0- 7 */
65 '&' , '*' , '(' , ')' , '_' , '+' , 0177 ,'\t' , /* scan 8-15 */
66 'Q' , 'W' , 'E' , 'R' , 'T' , 'Y' , 'U' , 'I' , /* scan 16-23 */
67 'O' , 'P' , '[' , ']' , '\r' , CTL , 'A' , 'S' , /* scan 24-31 */
68 'D' , 'F' , 'G' , 'H' , 'J' , 'K' , 'L' , ':' , /* scan 32-39 */
69 '"' , '~' , SHF , '|' , 'Z' , 'X' , 'C' , 'V' , /* scan 40-47 */
70 'B' , 'N' , 'M' , '<' , '>' , '?' , SHF , '*', /* scan 48-55 */
71 ALT , ' ' , CPS|L, 0, 0, ' ' , 0, 0, /* scan 56-63 */
72 0, 0, 0, 0, 0, NUM|L, STP|L, '7', /* scan 64-71 */
73 '8', '9', '-', '4', '5', '6', '+', '1', /* scan 72-79 */
74 '2', '3', '0', '.', 0, 0, 0, 0, /* scan 80-87 */
75 0,0,0,0,0,0,0,0,
76 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,
77 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, } ;
78
79 u_char ctl[] = { /* CTL shift */
80 0, 033 , '!' , 000 , '#' , '$' , '%' , 036 , /* scan 0- 7 */
81 '&' , '*' , '(' , ')' , 037 , '+' , 034 ,'\177', /* scan 8-15 */
82 021 , 027 , 005 , 022 , 024 , 031 , 025 , 011 , /* scan 16-23 */
83 017 , 020 , 033 , 035 , '\r' , CTL , 001 , 013 , /* scan 24-31 */
84 004 , 006 , 007 , 010 , 012 , 013 , 014 , ';' , /* scan 32-39 */
85 '\'' , '`' , SHF , 034 , 032 , 030 , 003 , 026 , /* scan 40-47 */
86 002 , 016 , 015 , '<' , '>' , '?' , SHF , '*', /* scan 48-55 */
87 ALT , ' ' , CPS|L, 0, 0, ' ' , 0, 0, /* scan 56-63 */
88 CPS|L, 0, 0, 0, 0, 0, 0, 0, /* scan 64-71 */
89 0, 0, 0, 0, 0, 0, 0, 0, /* scan 72-79 */
90 0, 0, 0, 0, 0, 0, 0, 0, /* scan 80-87 */
91 0, 0, 033, '7' , '4' , '1' , 0, NUM|L, /* scan 88-95 */
92 '8' , '5' , '2' , 0, STP|L, '9' , '6' , '3' , /*scan 96-103*/
93 '.' , 0, '*' , '-' , '+' , 0, 0, 0, /*scan 104-111*/
94 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, } ;
95
96 #ifdef notdef
97 struct key {
98 u_short action; /* how this key functions */
99 char ascii[8]; /* ascii result character indexed by shifts */
100 };
101 #endif
102
103 u_char shfts, ctls, alts, caps, num, stp;
104
105 #define KBSTATP 0x64 /* kbd status port */
106 #define KBS_INP_BUF_FUL 0x02 /* kbd char ready */
107 #define KBDATAP 0x60 /* kbd data port */
108 #define KBSTATUSPORT 0x61 /* kbd status */
109
110 u_char odt;
111
kbd()112 u_char kbd() {
113 u_char dt, brk, act;
114
115 loop:
116 while(inb(0x64)&1 == 0);
117 dt = inb(0x60);
118 do {
119 while(inb(0x64)&1 == 0);
120 } while(dt == inb(0x60));
121 odt = dt;
122
123 brk = dt & 0x80 ; dt = dt & 0x7f ;
124
125 act = action[dt];
126 if (act&SHF) {
127 if(brk) shfts = 0; else shfts = 1;
128 }
129 if (act&ALT) {
130 if(brk) alts = 0; else alts = 1;
131 }
132 if (act&NUM) {
133 if (act&L) {
134 if(!brk) num ^= 1;
135 } else if(brk) num = 0; else num = 1;
136 }
137 if (act&CTL) {
138 if(brk) ctls = 0; else ctls = 1;
139 }
140 if (act&CPS) {
141 if (act&L) {
142 if(!brk) caps ^= 1;
143 } else if(brk) caps = 0; else caps = 1;
144 }
145 if (act&STP) {
146 if (act&L) {
147 if(!brk) stp ^= 1;
148 } else if(brk) stp = 0; else stp = 1;
149 }
150 if(ctl && alts && dt == 83) exit();
151 if ((act&ASCII) && !brk) {
152 u_char chr;
153
154 if (shfts){
155 chr = shift[dt] ; } else {
156 if (ctls) {
157 chr = ctl[dt] ; } else {
158 chr = unshift[dt] ; } }
159 if (caps && (chr >= 'a' && chr <= 'z')) {
160 chr -= 'a' - 'A' ;
161 }
162 /*do
163 while(inb(0x64)&1 == 0) ;
164 while (inb(0x60) == (chr | 0x80));
165 while(inb(0x64)&1 == 1) inb(0x60);A*/
166 return(chr);
167 }
168 goto loop;
169 }
170
scankbd()171 scankbd() {
172 u_char c;
173
174 c = inb(0x60);
175 if (c == 0xaa) { odt = 0x2a; return (0); }
176 if (c == 0xfa) { odt = 0x7a; return (0); }
177 c &= 0x7f;
178
179 if ( (odt&0x7f) == c )return(0);
180 if(odt == 0) { odt = c; return(0); }
181 return(kbd());
182 }
183
kbdreset()184 kbdreset()
185 {
186 u_char c;
187
188 /* Enable interrupts and keyboard controller */
189 while (inb(0x64)&2); outb(0x64,0x60);
190 while (inb(0x64)&2); outb(0x60,0x4D);
191
192 /* Start keyboard stuff RESET */
193 while (inb(0x64)&2); /* wait input ready */
194 outb(0x60,0xFF); /* RESET */
195
196 while((c=inb(0x60))!=0xFA) ;
197
198 /* While we are here, defeat gatea20 */
199 while (inb(0x64)&2); /* wait input ready */
200 outb(0x64,0xd1);
201 while (inb(0x64)&2); /* wait input ready */
202 outb(0x60,0xdf);
203 }
204
getchar()205 u_char getchar() {
206 u_char c;
207
208 c = kbd();
209 if (c == '\b' || c == '\177') return(c);
210 if (c == '\r') c = '\n';
211 putchar(c);
212 return(c);
213 }
214
reset_cpu()215 reset_cpu() {
216
217 while (inb(0x64)&2); /* wait input ready */
218 outb(0x64,0xFE); /* Reset Command */
219 wait(4000000);
220 /* NOTREACHED */
221 }
222