|
0
|
1 // Console input and output.
|
|
|
2 // Input is from the keyboard or serial port.
|
|
|
3 // Output is written to the screen and serial port.
|
|
|
4
|
|
|
5 #include "types.h"
|
|
|
6 #include "defs.h"
|
|
|
7 #include "param.h"
|
|
|
8 #include "spinlock.h"
|
|
|
9 #include "fs.h"
|
|
|
10 #include "file.h"
|
|
|
11 #include "memlayout.h"
|
|
|
12 #include "mmu.h"
|
|
|
13 #include "proc.h"
|
|
|
14
|
|
|
15 static void consputc (int);
|
|
|
16
|
|
|
17 static int panicked = 0;
|
|
|
18
|
|
|
19 static struct {
|
|
|
20 struct spinlock lock;
|
|
|
21 int locking;
|
|
|
22 } cons;
|
|
|
23
|
|
|
24 static void printint (int xx, int base, int sign)
|
|
|
25 {
|
|
|
26 static char digits[] = "0123456789abcdef";
|
|
|
27 char buf[16];
|
|
|
28 int i;
|
|
|
29 uint x;
|
|
|
30
|
|
|
31 if (sign && (sign = xx < 0)) {
|
|
|
32 x = -xx;
|
|
|
33 } else {
|
|
|
34 x = xx;
|
|
|
35 }
|
|
|
36
|
|
|
37 i = 0;
|
|
|
38
|
|
|
39 do {
|
|
|
40 buf[i++] = digits[x % base];
|
|
|
41 } while ((x /= base) != 0);
|
|
|
42
|
|
|
43 if (sign) {
|
|
|
44 buf[i++] = '-';
|
|
|
45 }
|
|
|
46
|
|
|
47 while (--i >= 0) {
|
|
|
48 consputc(buf[i]);
|
|
|
49 }
|
|
|
50 }
|
|
|
51 //PAGEBREAK: 50
|
|
|
52
|
|
|
53 // Print to the console. only understands %d, %x, %p, %s.
|
|
|
54 void cprintf (char *fmt, ...)
|
|
|
55 {
|
|
|
56 int i, c, locking;
|
|
|
57 uint *argp;
|
|
|
58 char *s;
|
|
|
59
|
|
|
60 locking = cons.locking;
|
|
|
61
|
|
|
62 if (locking) {
|
|
|
63 acquire(&cons.lock);
|
|
|
64 }
|
|
|
65
|
|
|
66 if (fmt == 0) {
|
|
|
67 panic("null fmt");
|
|
|
68 }
|
|
|
69
|
|
|
70 argp = (uint*) (void*) (&fmt + 1);
|
|
|
71
|
|
|
72 for (i = 0; (c = fmt[i] & 0xff) != 0; i++) {
|
|
|
73 if (c != '%') {
|
|
|
74 consputc(c);
|
|
|
75 continue;
|
|
|
76 }
|
|
|
77
|
|
|
78 c = fmt[++i] & 0xff;
|
|
|
79
|
|
|
80 if (c == 0) {
|
|
|
81 break;
|
|
|
82 }
|
|
|
83
|
|
|
84 switch (c) {
|
|
|
85 case 'd':
|
|
|
86 printint(*argp++, 10, 1);
|
|
|
87 break;
|
|
|
88
|
|
|
89 case 'x':
|
|
|
90 case 'p':
|
|
|
91 printint(*argp++, 16, 0);
|
|
|
92 break;
|
|
|
93
|
|
|
94 case 's':
|
|
|
95 if ((s = (char*) *argp++) == 0) {
|
|
|
96 s = "(null)";
|
|
|
97 }
|
|
|
98
|
|
|
99 for (; *s; s++) {
|
|
|
100 consputc(*s);
|
|
|
101 }
|
|
|
102 break;
|
|
|
103
|
|
|
104 case '%':
|
|
|
105 consputc('%');
|
|
|
106 break;
|
|
|
107
|
|
|
108 default:
|
|
|
109 // Print unknown % sequence to draw attention.
|
|
|
110 consputc('%');
|
|
|
111 consputc(c);
|
|
|
112 break;
|
|
|
113 }
|
|
|
114 }
|
|
|
115
|
|
|
116 if (locking) {
|
|
|
117 release(&cons.lock);
|
|
|
118 }
|
|
|
119 }
|
|
|
120
|
|
|
121 void panic (char *s)
|
|
|
122 {
|
|
|
123 cli();
|
|
|
124
|
|
|
125 cons.locking = 0;
|
|
|
126
|
|
|
127 cprintf("cpu%d: panic: ", cpu->id);
|
|
|
128
|
|
|
129 show_callstk(s);
|
|
|
130 panicked = 1; // freeze other CPU
|
|
|
131
|
|
|
132 while (1)
|
|
|
133 ;
|
|
|
134 }
|
|
|
135
|
|
|
136 //PAGEBREAK: 50
|
|
|
137 #define BACKSPACE 0x100
|
|
|
138 #define CRTPORT 0x3d4
|
|
|
139
|
|
|
140 void consputc (int c)
|
|
|
141 {
|
|
|
142 if (panicked) {
|
|
|
143 cli();
|
|
|
144 while (1)
|
|
|
145 ;
|
|
|
146 }
|
|
|
147
|
|
|
148 if (c == BACKSPACE) {
|
|
|
149 uartputc('\b');
|
|
|
150 uartputc(' ');
|
|
|
151 uartputc('\b');
|
|
|
152 } else {
|
|
|
153 uartputc(c);
|
|
|
154 }
|
|
|
155
|
|
|
156 // cgaputc(c);
|
|
|
157 }
|
|
|
158
|
|
|
159 #define INPUT_BUF 512
|
|
|
160 struct {
|
|
|
161 struct spinlock lock;
|
|
|
162 char buf[INPUT_BUF];
|
|
|
163 uint r; // Read index
|
|
|
164 uint w; // Write index
|
|
|
165 uint e; // Edit index
|
|
|
166 } input;
|
|
|
167
|
|
|
168 #define C(x) ((x)-'@') // Control-x
|
|
|
169 void consoleintr (int (*getc) (void))
|
|
|
170 {
|
|
|
171 int c;
|
|
|
172
|
|
|
173 acquire(&input.lock);
|
|
|
174
|
|
|
175 while ((c = getc()) >= 0) {
|
|
|
176 switch (c) {
|
|
|
177 case C('P'): // Process listing.
|
|
|
178 procdump();
|
|
|
179 break;
|
|
|
180
|
|
|
181 case C('U'): // Kill line.
|
|
|
182 while ((input.e != input.w) && (input.buf[(input.e - 1) % INPUT_BUF] != '\n')) {
|
|
|
183 input.e--;
|
|
|
184 consputc(BACKSPACE);
|
|
|
185 }
|
|
|
186
|
|
|
187 break;
|
|
|
188
|
|
|
189 case C('H'):
|
|
|
190 case '\x7f': // Backspace
|
|
|
191 if (input.e != input.w) {
|
|
|
192 input.e--;
|
|
|
193 consputc(BACKSPACE);
|
|
|
194 }
|
|
|
195
|
|
|
196 break;
|
|
|
197
|
|
|
198 default:
|
|
|
199 if ((c != 0) && (input.e - input.r < INPUT_BUF)) {
|
|
|
200 c = (c == '\r') ? '\n' : c;
|
|
|
201
|
|
|
202 input.buf[input.e++ % INPUT_BUF] = c;
|
|
|
203 consputc(c);
|
|
|
204
|
|
|
205 if (c == '\n' || c == C('D') || input.e == input.r + INPUT_BUF) {
|
|
|
206 input.w = input.e;
|
|
|
207 wakeup(&input.r);
|
|
|
208 }
|
|
|
209 }
|
|
|
210
|
|
|
211 break;
|
|
|
212 }
|
|
|
213 }
|
|
|
214
|
|
|
215 release(&input.lock);
|
|
|
216 }
|
|
|
217
|
|
24
|
218 __code cbc_consoleread (struct inode *ip, char *dst, int n, __code(*next)(int ret))
|
|
|
219 {
|
|
|
220 uint target;
|
|
|
221 int c;
|
|
|
222
|
|
|
223 iunlock(ip);
|
|
|
224
|
|
|
225 target = n;
|
|
|
226 acquire(&input.lock);
|
|
|
227
|
|
|
228 while (n > 0) {
|
|
|
229 while (input.r == input.w) {
|
|
|
230 if (proc->killed) {
|
|
|
231 release(&input.lock);
|
|
|
232 ilock(ip);
|
|
|
233 goto next(-1);
|
|
|
234 }
|
|
|
235
|
|
|
236 proc->cbc_arg.cbc_console_arg.n = n;
|
|
|
237 proc->cbc_arg.cbc_console_arg.dst = dst;
|
|
|
238 proc->cbc_arg.cbc_console_arg.ip = ip;
|
|
|
239 proc->cbc_arg.cbc_console_arg.next = next;
|
|
|
240 goto cbc_sleep(&input.r, &input.lock, cbc_consoleread1);
|
|
|
241 }
|
|
|
242 }
|
|
|
243
|
|
|
244 __code cbc_consoleread1 (__code(*next)(int ret))
|
|
|
245 {
|
|
|
246 int cont = 1;
|
|
|
247 proc->cbc_arg.cbc_console_arg.n = n;
|
|
|
248 proc->cbc_arg.cbc_console_arg.dst = dst;
|
|
|
249 proc->cbc_arg.cbc_console_arg.ip = ip;
|
|
|
250
|
|
|
251 c = input.buf[input.r++ % INPUT_BUF];
|
|
|
252
|
|
|
253 if (c == C('D')) { // EOF
|
|
|
254 if (n < target) {
|
|
|
255 // Save ^D for next time, to make sure
|
|
|
256 // caller gets a 0-byte result.
|
|
|
257 input.r--;
|
|
|
258 }
|
|
|
259 cont = 0;
|
|
|
260 }
|
|
|
261
|
|
|
262 *dst++ = c;
|
|
|
263 --n;
|
|
|
264
|
|
|
265 if (c == '\n') {
|
|
|
266 cont = 0;
|
|
|
267 }
|
|
|
268
|
|
|
269
|
|
|
270 if (cont){
|
|
|
271 proc->cbc_arg.cbc_console_arg.n = n;
|
|
|
272 proc->cbc_arg.cbc_console_arg.dst = dst;
|
|
|
273 proc->cbc_arg.cbc_console_arg.ip = ip;
|
|
|
274 proc->cbc_arg.cbc_console_arg.next = next;
|
|
|
275 goto cbc_sleep(&input.r, &input.lock, cbc_consoleread1);
|
|
|
276 }
|
|
|
277
|
|
|
278 release(&input.lock);
|
|
|
279 ilock(ip);
|
|
|
280
|
|
|
281 goto next(target - n);
|
|
|
282 }
|
|
|
283
|
|
0
|
284 int consoleread (struct inode *ip, char *dst, int n)
|
|
|
285 {
|
|
|
286 uint target;
|
|
|
287 int c;
|
|
|
288
|
|
|
289 iunlock(ip);
|
|
|
290
|
|
|
291 target = n;
|
|
|
292 acquire(&input.lock);
|
|
|
293
|
|
|
294 while (n > 0) {
|
|
|
295 while (input.r == input.w) {
|
|
|
296 if (proc->killed) {
|
|
|
297 release(&input.lock);
|
|
|
298 ilock(ip);
|
|
|
299 return -1;
|
|
|
300 }
|
|
|
301
|
|
|
302 sleep(&input.r, &input.lock);
|
|
|
303 }
|
|
|
304
|
|
|
305 c = input.buf[input.r++ % INPUT_BUF];
|
|
|
306
|
|
|
307 if (c == C('D')) { // EOF
|
|
|
308 if (n < target) {
|
|
|
309 // Save ^D for next time, to make sure
|
|
|
310 // caller gets a 0-byte result.
|
|
|
311 input.r--;
|
|
|
312 }
|
|
|
313
|
|
|
314 break;
|
|
|
315 }
|
|
|
316
|
|
|
317 *dst++ = c;
|
|
|
318 --n;
|
|
|
319
|
|
|
320 if (c == '\n') {
|
|
|
321 break;
|
|
|
322 }
|
|
|
323 }
|
|
|
324
|
|
|
325 release(&input.lock);
|
|
|
326 ilock(ip);
|
|
|
327
|
|
|
328 return target - n;
|
|
|
329 }
|
|
|
330
|
|
|
331 int consolewrite (struct inode *ip, char *buf, int n)
|
|
|
332 {
|
|
|
333 int i;
|
|
|
334
|
|
|
335 iunlock(ip);
|
|
|
336
|
|
|
337 acquire(&cons.lock);
|
|
|
338
|
|
|
339 for (i = 0; i < n; i++) {
|
|
|
340 consputc(buf[i] & 0xff);
|
|
|
341 }
|
|
|
342
|
|
|
343 release(&cons.lock);
|
|
|
344
|
|
|
345 ilock(ip);
|
|
|
346
|
|
|
347 return n;
|
|
|
348 }
|
|
|
349
|
|
|
350 void consoleinit (void)
|
|
|
351 {
|
|
|
352 initlock(&cons.lock, "console");
|
|
|
353 initlock(&input.lock, "input");
|
|
|
354
|
|
|
355 devsw[CONSOLE].write = consolewrite;
|
|
|
356 devsw[CONSOLE].read = consoleread;
|
|
24
|
357 cbc_devsw[CONSOLE].write = cbc_consolewrite;
|
|
|
358 cbc_devsw[CONSOLE].read = cbc_consoleread;
|
|
0
|
359
|
|
|
360 cons.locking = 1;
|
|
|
361 }
|
|
|
362
|
