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510 jermar 1
/*
2
 * Copyright (C) 2005 Jakub Jermar
3
 * All rights reserved.
4
 *
5
 * Redistribution and use in source and binary forms, with or without
6
 * modification, are permitted provided that the following conditions
7
 * are met:
8
 *
9
 * - Redistributions of source code must retain the above copyright
10
 *   notice, this list of conditions and the following disclaimer.
11
 * - Redistributions in binary form must reproduce the above copyright
12
 *   notice, this list of conditions and the following disclaimer in the
13
 *   documentation and/or other materials provided with the distribution.
14
 * - The name of the author may not be used to endorse or promote products
15
 *   derived from this software without specific prior written permission.
16
 *
17
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27
 */
28
 
518 jermar 29
#include <console/kconsole.h>
510 jermar 30
#include <console/console.h>
31
#include <console/chardev.h>
32
#include <print.h>
517 jermar 33
#include <panic.h>
510 jermar 34
#include <typedefs.h>
35
#include <arch/types.h>
517 jermar 36
#include <list.h>
37
#include <arch.h>
38
#include <func.h>
39
#include <macros.h>
518 jermar 40
#include <debug.h>
510 jermar 41
 
517 jermar 42
#define MAX_CMDLINE	256
43
 
44
/** Simple kernel console.
45
 *
46
 * The console is realized by kernel thread kconsole.
518 jermar 47
 * It doesn't understand any useful command on its own,
48
 * but makes it possible for other kernel subsystems to
517 jermar 49
 * register their own commands.
50
 */
51
 
52
/** Locking.
53
 *
54
 * There is a list of cmd_info_t structures. This list
55
 * is protected by cmd_lock spinlock. Note that specially
56
 * the link elements of cmd_info_t are protected by
57
 * this lock.
58
 *
59
 * Each cmd_info_t also has its own lock, which protects
60
 * all elements thereof except the link element.
61
 *
62
 * cmd_lock must be acquired before any cmd_info lock.
63
 * When locking two cmd info structures, structure with
64
 * lower address must be locked first.
65
 */
66
 
67
spinlock_t cmd_lock;	/**< Lock protecting command list. */
68
link_t cmd_head;	/**< Command list. */
69
 
70
static cmd_info_t *parse_cmdline(char *cmdline, size_t len);
518 jermar 71
static bool parse_argument(char *cmdline, size_t len, index_t *start, index_t *end);
517 jermar 72
 
518 jermar 73
/** Data and methods for 'help' command. */
74
static int cmd_help(cmd_arg_t *argv);
517 jermar 75
static cmd_info_t help_info;
76
 
518 jermar 77
/** Data and methods for 'description' command. */
78
static int cmd_desc(cmd_arg_t *argv);
79
static void desc_help(void);
80
static cmd_info_t desc_info;
81
static char desc_buf[MAX_CMDLINE+1];
82
static cmd_arg_t desc_argv = {
83
	.type = ARG_TYPE_STRING,
84
	.buffer = desc_buf,
85
	.len = sizeof(desc_buf)
86
};
87
 
544 decky 88
/** Data and methods for 'halt' command. */
89
static int cmd_halt(cmd_arg_t *argv);
90
static cmd_info_t halt_info;
91
 
517 jermar 92
/** Initialize kconsole data structures. */
93
void kconsole_init(void)
94
{
95
	spinlock_initialize(&cmd_lock);
96
	list_initialize(&cmd_head);
97
 
98
	help_info.name = "help";
99
	help_info.description = "List supported commands.";
100
	help_info.func = cmd_help;
518 jermar 101
	help_info.help = NULL;
517 jermar 102
	help_info.argc = 0;
103
	help_info.argv = NULL;
518 jermar 104
 
517 jermar 105
	spinlock_initialize(&help_info.lock);
106
	link_initialize(&help_info.link);
518 jermar 107
 
108
	if (!cmd_register(&help_info))
109
		panic("could not register command %s\n", help_info.name);
110
 
111
 
112
	desc_info.name = "describe";
113
	desc_info.description = "Describe specified command.";
114
	desc_info.help = desc_help;
115
	desc_info.func = cmd_desc;
116
	desc_info.argc = 1;
117
	desc_info.argv = &desc_argv;
517 jermar 118
 
518 jermar 119
	spinlock_initialize(&desc_info.lock);
120
	link_initialize(&desc_info.link);
121
 
122
	if (!cmd_register(&desc_info))
123
		panic("could not register command %s\n", desc_info.name);
544 decky 124
 
125
 
126
	halt_info.name = "halt";
127
	halt_info.description = "Halt the kernel.";
128
	halt_info.func = cmd_halt;
129
	halt_info.help = NULL;
130
	halt_info.argc = 0;
131
	halt_info.argv = NULL;
132
 
133
	spinlock_initialize(&halt_info.lock);
134
	link_initialize(&halt_info.link);
135
 
136
	if (!cmd_register(&halt_info))
137
		panic("could not register command %s\n", halt_info.name);
517 jermar 138
}
139
 
140
 
141
/** Register kconsole command.
142
 *
143
 * @param cmd Structure describing the command.
144
 *
145
 * @return 0 on failure, 1 on success.
146
 */
147
int cmd_register(cmd_info_t *cmd)
148
{
149
	ipl_t ipl;
150
	link_t *cur;
151
 
152
	ipl = interrupts_disable();
153
	spinlock_lock(&cmd_lock);
154
 
155
	/*
156
	 * Make sure the command is not already listed.
157
	 */
158
	for (cur = cmd_head.next; cur != &cmd_head; cur = cur->next) {
159
		cmd_info_t *hlp;
160
 
161
		hlp = list_get_instance(cur, cmd_info_t, link);
162
 
163
		if (hlp == cmd) {
164
			/* The command is already there. */
165
			spinlock_unlock(&cmd_lock);
166
			interrupts_restore(ipl);
167
			return 0;
168
		}
169
 
170
		/* Avoid deadlock. */
171
		if (hlp < cmd) {
172
			spinlock_lock(&hlp->lock);
173
			spinlock_lock(&cmd->lock);
174
		} else {
175
			spinlock_lock(&cmd->lock);
176
			spinlock_lock(&hlp->lock);
177
		}
178
 
518 jermar 179
		if ((strncmp(hlp->name, cmd->name, strlen(cmd->name)) == 0)) {
517 jermar 180
			/* The command is already there. */
181
			spinlock_unlock(&hlp->lock);
182
			spinlock_unlock(&cmd->lock);
183
			spinlock_unlock(&cmd_lock);
184
			interrupts_restore(ipl);
185
			return 0;
186
		}
187
 
188
		spinlock_unlock(&hlp->lock);
189
		spinlock_unlock(&cmd->lock);
190
	}
191
 
192
	/*
193
	 * Now the command can be added.
194
	 */
195
	list_append(&cmd->link, &cmd_head);
196
 
197
	spinlock_unlock(&cmd_lock);
198
	interrupts_restore(ipl);
199
	return 1;
200
}
201
 
510 jermar 202
/** Kernel console managing thread.
203
 *
204
 * @param arg Not used.
205
 */
206
void kconsole(void *arg)
207
{
517 jermar 208
	char cmdline[MAX_CMDLINE+1];
209
	cmd_info_t *cmd_info;
210
	count_t len;
510 jermar 211
 
212
	if (!stdin) {
213
		printf("%s: no stdin\n", __FUNCTION__);
214
		return;
215
	}
216
 
217
	while (true) {
218
		printf("%s> ", __FUNCTION__);
518 jermar 219
		if (!(len = gets(stdin, cmdline, sizeof(cmdline))))
220
			continue;
517 jermar 221
		cmdline[len] = '\0';
222
		cmd_info = parse_cmdline(cmdline, len);
518 jermar 223
		if (!cmd_info)
517 jermar 224
			continue;
225
		(void) cmd_info->func(cmd_info->argv);
510 jermar 226
	}
227
}
517 jermar 228
 
229
/** Parse command line.
230
 *
231
 * @param cmdline Command line as read from input device.
232
 * @param len Command line length.
233
 *
234
 * @return Structure describing the command.
235
 */
236
cmd_info_t *parse_cmdline(char *cmdline, size_t len)
237
{
238
	index_t start = 0, end = 0;
239
	cmd_info_t *cmd = NULL;
240
	link_t *cur;
241
	ipl_t ipl;
242
	int i;
243
 
518 jermar 244
	if (!parse_argument(cmdline, len, &start, &end)) {
517 jermar 245
		/* Command line did not contain alphanumeric word. */
246
		return NULL;
247
	}
248
 
249
	ipl = interrupts_disable();
250
	spinlock_lock(&cmd_lock);
251
 
252
	for (cur = cmd_head.next; cur != &cmd_head; cur = cur->next) {
253
		cmd_info_t *hlp;
254
 
255
		hlp = list_get_instance(cur, cmd_info_t, link);
256
		spinlock_lock(&hlp->lock);
257
 
518 jermar 258
		if (strncmp(hlp->name, &cmdline[start], (end - start) + 1) == 0) {
517 jermar 259
			cmd = hlp;
260
			break;
261
		}
262
 
263
		spinlock_unlock(&hlp->lock);
264
	}
265
 
266
	spinlock_unlock(&cmd_lock);	
267
 
268
	if (!cmd) {
269
		/* Unknown command. */
518 jermar 270
		printf("Unknown command.\n");
517 jermar 271
		interrupts_restore(ipl);
272
		return NULL;
273
	}
274
 
275
	/* cmd == hlp is locked */
276
 
277
	/*
278
	 * The command line must be further analyzed and
279
	 * the parameters therefrom must be matched and
280
	 * converted to those specified in the cmd info
281
	 * structure.
282
	 */
518 jermar 283
 
284
	for (i = 0; i < cmd->argc; i++) {
285
		char *buf;
286
		start = end + 1;
287
		if (!parse_argument(cmdline, len, &start, &end)) {
288
			printf("Too few arguments.\n");
289
			spinlock_unlock(&cmd->lock);
290
			interrupts_restore(ipl);
291
			return NULL;
292
		}
293
 
294
		switch (cmd->argv[i].type) {
295
		    case ARG_TYPE_STRING:
296
		    	buf = cmd->argv[i].buffer;
297
		    	strncpy(buf, (const char *) &cmdline[start], min((end - start) + 1, cmd->argv[i].len - 1));
298
			buf[min((end - start) + 1, cmd->argv[i].len - 1)] = '\0';
299
			break;
300
		    case ARG_TYPE_INT:
301
		    case ARG_TYPE_INVALID:
302
		    default:
303
			panic("invalid argument type\n");
304
			break;
305
		}
306
	}
517 jermar 307
 
518 jermar 308
	start = end + 1;
309
	if (parse_argument(cmdline, len, &start, &end)) {
310
		printf("Too many arguments.\n");
311
		spinlock_unlock(&cmd->lock);
312
		interrupts_restore(ipl);
313
		return NULL;
314
	}
315
 
517 jermar 316
	spinlock_unlock(&cmd->lock);
317
	interrupts_restore(ipl);
318
	return cmd;
319
}
320
 
518 jermar 321
/** Parse argument.
322
 *
323
 * Find start and end positions of command line argument.
324
 *
325
 * @param cmdline Command line as read from the input device.
326
 * @param len Number of characters in cmdline.
327
 * @param start On entry, 'start' contains pointer to the index 
328
 *        of first unprocessed character of cmdline.
329
 *        On successful exit, it marks beginning of the next argument.
330
 * @param end Undefined on entry. On exit, 'end' points to the last character
331
 *        of the next argument.
332
 *
333
 * @return false on failure, true on success.
334
 */
335
bool parse_argument(char *cmdline, size_t len, index_t *start, index_t *end)
336
{
337
	int i;
338
	bool found_start = false;
339
 
340
	ASSERT(start != NULL);
341
	ASSERT(end != NULL);
342
 
343
	for (i = *start; i < len; i++) {
344
		if (!found_start) {
345
			if (is_white(cmdline[i]))
346
				(*start)++;
347
			else
348
				found_start = true;
349
		} else {
350
			if (is_white(cmdline[i]))
351
				break;
352
		}
353
	}
354
	*end = i - 1;
355
 
356
	return found_start;
357
}
358
 
359
 
517 jermar 360
/** List supported commands.
361
 *
518 jermar 362
 * @param argv Argument vector.
517 jermar 363
 *
364
 * @return 0 on failure, 1 on success.
365
 */
518 jermar 366
int cmd_help(cmd_arg_t *argv)
517 jermar 367
{
368
	link_t *cur;
369
	ipl_t ipl;
370
 
371
	ipl = interrupts_disable();
372
	spinlock_lock(&cmd_lock);
373
 
374
	for (cur = cmd_head.next; cur != &cmd_head; cur = cur->next) {
375
		cmd_info_t *hlp;
376
 
377
		hlp = list_get_instance(cur, cmd_info_t, link);
378
		spinlock_lock(&hlp->lock);
379
 
518 jermar 380
		printf("%s - %s\n", hlp->name, hlp->description);
517 jermar 381
 
382
		spinlock_unlock(&hlp->lock);
383
	}
384
 
385
	spinlock_unlock(&cmd_lock);	
386
	interrupts_restore(ipl);
387
 
388
	return 1;
389
}
518 jermar 390
 
391
/** Describe specified command.
392
 *
393
 * @param argv Argument vector.
394
 *
395
 * @return 0 on failure, 1 on success.
396
 */
397
int cmd_desc(cmd_arg_t *argv)
398
{
399
	link_t *cur;
400
	ipl_t ipl;
401
 
402
	ipl = interrupts_disable();
403
	spinlock_lock(&cmd_lock);
404
 
405
	for (cur = cmd_head.next; cur != &cmd_head; cur = cur->next) {
406
		cmd_info_t *hlp;
407
 
408
		hlp = list_get_instance(cur, cmd_info_t, link);
409
		spinlock_lock(&hlp->lock);
410
 
411
		if (strncmp(hlp->name, (const char *) argv->buffer, strlen(hlp->name)) == 0) {
412
			printf("%s - %s\n", hlp->name, hlp->description);
413
			if (hlp->help)
414
				hlp->help();
415
			spinlock_unlock(&hlp->lock);
416
			break;
417
		}
418
 
419
		spinlock_unlock(&hlp->lock);
420
	}
421
 
422
	spinlock_unlock(&cmd_lock);	
423
	interrupts_restore(ipl);
424
 
425
	return 1;
426
}
427
 
548 jermar 428
/** Print detailed description of 'describe' command. */
429
void desc_help(void)
430
{
431
	printf("Syntax: describe command_name\n");
432
}
433
 
544 decky 434
/** Halt the kernel.
435
 *
548 jermar 436
 * @param argv Argument vector (ignored).
544 decky 437
 *
548 jermar 438
 * @return 0 on failure, 1 on success (never returns).
544 decky 439
 */
440
int cmd_halt(cmd_arg_t *argv)
441
{
442
	halt();
443
	return 1;
444
}