summaryrefslogtreecommitdiff
path: root/drivers/acpi/namespace/nsload.c
blob: 1428a84a31e6bee0b6a83d733c13109d27e030e6 (plain)
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
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
/******************************************************************************
 *
 * Module Name: nsload - namespace loading/expanding/contracting procedures
 *
 *****************************************************************************/

/*
 * Copyright (C) 2000 - 2005, R. Byron Moore
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions, and the following disclaimer,
 *    without modification.
 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
 *    substantially similar to the "NO WARRANTY" disclaimer below
 *    ("Disclaimer") and any redistribution must be conditioned upon
 *    including a substantially similar Disclaimer requirement for further
 *    binary redistribution.
 * 3. Neither the names of the above-listed copyright holders nor the names
 *    of any contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * Alternatively, this software may be distributed under the terms of the
 * GNU General Public License ("GPL") version 2 as published by the Free
 * Software Foundation.
 *
 * NO WARRANTY
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGES.
 */


#include <acpi/acpi.h>
#include <acpi/acnamesp.h>
#include <acpi/acdispat.h>


#define _COMPONENT          ACPI_NAMESPACE
	 ACPI_MODULE_NAME    ("nsload")

/* Local prototypes */

static acpi_status
acpi_ns_load_table_by_type (
	acpi_table_type                 table_type);

#ifdef ACPI_FUTURE_IMPLEMENTATION
acpi_status
acpi_ns_unload_namespace (
	acpi_handle                     handle);

static acpi_status
acpi_ns_delete_subtree (
	acpi_handle                     start_handle);
#endif


#ifndef ACPI_NO_METHOD_EXECUTION
/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_load_table
 *
 * PARAMETERS:  table_desc      - Descriptor for table to be loaded
 *              Node            - Owning NS node
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Load one ACPI table into the namespace
 *
 ******************************************************************************/

acpi_status
acpi_ns_load_table (
	struct acpi_table_desc          *table_desc,
	struct acpi_namespace_node      *node)
{
	acpi_status                     status;


	ACPI_FUNCTION_TRACE ("ns_load_table");


	/* Check if table contains valid AML (must be DSDT, PSDT, SSDT, etc.) */

	if (!(acpi_gbl_table_data[table_desc->type].flags & ACPI_TABLE_EXECUTABLE)) {
		/* Just ignore this table */

		return_ACPI_STATUS (AE_OK);
	}

	/* Check validity of the AML start and length */

	if (!table_desc->aml_start) {
		ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Null AML pointer\n"));
		return_ACPI_STATUS (AE_BAD_PARAMETER);
	}

	ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "AML block at %p\n",
		table_desc->aml_start));

	/* Ignore table if there is no AML contained within */

	if (!table_desc->aml_length) {
		ACPI_REPORT_WARNING (("Zero-length AML block in table [%4.4s]\n",
			table_desc->pointer->signature));
		return_ACPI_STATUS (AE_OK);
	}

	/*
	 * Parse the table and load the namespace with all named
	 * objects found within.  Control methods are NOT parsed
	 * at this time.  In fact, the control methods cannot be
	 * parsed until the entire namespace is loaded, because
	 * if a control method makes a forward reference (call)
	 * to another control method, we can't continue parsing
	 * because we don't know how many arguments to parse next!
	 */
	ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
		"**** Loading table into namespace ****\n"));

	status = acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE);
	if (ACPI_FAILURE (status)) {
		return_ACPI_STATUS (status);
	}

	status = acpi_ns_parse_table (table_desc, node->child);
	(void) acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);

	if (ACPI_FAILURE (status)) {
		return_ACPI_STATUS (status);
	}

	/*
	 * Now we can parse the control methods.  We always parse
	 * them here for a sanity check, and if configured for
	 * just-in-time parsing, we delete the control method
	 * parse trees.
	 */
	ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
		"**** Begin Table Method Parsing and Object Initialization ****\n"));

	status = acpi_ds_initialize_objects (table_desc, node);

	ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
		"**** Completed Table Method Parsing and Object Initialization ****\n"));

	return_ACPI_STATUS (status);
}


/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_load_table_by_type
 *
 * PARAMETERS:  table_type          - Id of the table type to load
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Load an ACPI table or tables into the namespace.  All tables
 *              of the given type are loaded.  The mechanism allows this
 *              routine to be called repeatedly.
 *
 ******************************************************************************/

static acpi_status
acpi_ns_load_table_by_type (
	acpi_table_type                 table_type)
{
	u32                             i;
	acpi_status                     status;
	struct acpi_table_desc          *table_desc;


	ACPI_FUNCTION_TRACE ("ns_load_table_by_type");


	status = acpi_ut_acquire_mutex (ACPI_MTX_TABLES);
	if (ACPI_FAILURE (status)) {
		return_ACPI_STATUS (status);
	}

	/*
	 * Table types supported are:
	 * DSDT (one), SSDT/PSDT (multiple)
	 */
	switch (table_type) {
	case ACPI_TABLE_DSDT:

		ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Namespace load: DSDT\n"));

		table_desc = acpi_gbl_table_lists[ACPI_TABLE_DSDT].next;

		/* If table already loaded into namespace, just return */

		if (table_desc->loaded_into_namespace) {
			goto unlock_and_exit;
		}

		/* Now load the single DSDT */

		status = acpi_ns_load_table (table_desc, acpi_gbl_root_node);
		if (ACPI_SUCCESS (status)) {
			table_desc->loaded_into_namespace = TRUE;
		}
		break;


	case ACPI_TABLE_SSDT:
	case ACPI_TABLE_PSDT:

		ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Namespace load: %d SSDT or PSDTs\n",
			acpi_gbl_table_lists[table_type].count));

		/*
		 * Traverse list of SSDT or PSDT tables
		 */
		table_desc = acpi_gbl_table_lists[table_type].next;
		for (i = 0; i < acpi_gbl_table_lists[table_type].count; i++) {
			/*
			 * Only attempt to load table into namespace if it is not
			 * already loaded!
			 */
			if (!table_desc->loaded_into_namespace) {
				status = acpi_ns_load_table (table_desc, acpi_gbl_root_node);
				if (ACPI_FAILURE (status)) {
					break;
				}

				table_desc->loaded_into_namespace = TRUE;
			}

			table_desc = table_desc->next;
		}
		break;


	default:
		status = AE_SUPPORT;
		break;
	}


unlock_and_exit:
	(void) acpi_ut_release_mutex (ACPI_MTX_TABLES);
	return_ACPI_STATUS (status);
}


/*******************************************************************************
 *
 * FUNCTION:    acpi_load_namespace
 *
 * PARAMETERS:  None
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Load the name space from what ever is pointed to by DSDT.
 *              (DSDT points to either the BIOS or a buffer.)
 *
 ******************************************************************************/

acpi_status
acpi_ns_load_namespace (
	void)
{
	acpi_status                     status;


	ACPI_FUNCTION_TRACE ("acpi_load_name_space");


	/* There must be at least a DSDT installed */

	if (acpi_gbl_DSDT == NULL) {
		ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "DSDT is not in memory\n"));
		return_ACPI_STATUS (AE_NO_ACPI_TABLES);
	}

	/*
	 * Load the namespace.  The DSDT is required,
	 * but the SSDT and PSDT tables are optional.
	 */
	status = acpi_ns_load_table_by_type (ACPI_TABLE_DSDT);
	if (ACPI_FAILURE (status)) {
		return_ACPI_STATUS (status);
	}

	/* Ignore exceptions from these */

	(void) acpi_ns_load_table_by_type (ACPI_TABLE_SSDT);
	(void) acpi_ns_load_table_by_type (ACPI_TABLE_PSDT);

	ACPI_DEBUG_PRINT_RAW ((ACPI_DB_INIT,
		"ACPI Namespace successfully loaded at root %p\n",
		acpi_gbl_root_node));

	return_ACPI_STATUS (status);
}


#ifdef ACPI_FUTURE_IMPLEMENTATION
/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_delete_subtree
 *
 * PARAMETERS:  start_handle        - Handle in namespace where search begins
 *
 * RETURNS      Status
 *
 * DESCRIPTION: Walks the namespace starting at the given handle and deletes
 *              all objects, entries, and scopes in the entire subtree.
 *
 *              Namespace/Interpreter should be locked or the subsystem should
 *              be in shutdown before this routine is called.
 *
 ******************************************************************************/

static acpi_status
acpi_ns_delete_subtree (
	acpi_handle                     start_handle)
{
	acpi_status                     status;
	acpi_handle                     child_handle;
	acpi_handle                     parent_handle;
	acpi_handle                     next_child_handle;
	acpi_handle                     dummy;
	u32                             level;


	ACPI_FUNCTION_TRACE ("ns_delete_subtree");


	parent_handle = start_handle;
	child_handle = NULL;
	level        = 1;

	/*
	 * Traverse the tree of objects until we bubble back up
	 * to where we started.
	 */
	while (level > 0) {
		/* Attempt to get the next object in this scope */

		status = acpi_get_next_object (ACPI_TYPE_ANY, parent_handle,
				  child_handle, &next_child_handle);

		child_handle = next_child_handle;

		/* Did we get a new object? */

		if (ACPI_SUCCESS (status)) {
			/* Check if this object has any children */

			if (ACPI_SUCCESS (acpi_get_next_object (ACPI_TYPE_ANY, child_handle,
					 NULL, &dummy))) {
				/*
				 * There is at least one child of this object,
				 * visit the object
				 */
				level++;
				parent_handle = child_handle;
				child_handle = NULL;
			}
		}
		else {
			/*
			 * No more children in this object, go back up to
			 * the object's parent
			 */
			level--;

			/* Delete all children now */

			acpi_ns_delete_children (child_handle);

			child_handle = parent_handle;
			status = acpi_get_parent (parent_handle, &parent_handle);
			if (ACPI_FAILURE (status)) {
				return_ACPI_STATUS (status);
			}
		}
	}

	/* Now delete the starting object, and we are done */

	acpi_ns_delete_node (child_handle);

	return_ACPI_STATUS (AE_OK);
}


/*******************************************************************************
 *
 *  FUNCTION:       acpi_ns_unload_name_space
 *
 *  PARAMETERS:     Handle          - Root of namespace subtree to be deleted
 *
 *  RETURN:         Status
 *
 *  DESCRIPTION:    Shrinks the namespace, typically in response to an undocking
 *                  event.  Deletes an entire subtree starting from (and
 *                  including) the given handle.
 *
 ******************************************************************************/

acpi_status
acpi_ns_unload_namespace (
	acpi_handle                     handle)
{
	acpi_status                     status;


	ACPI_FUNCTION_TRACE ("ns_unload_name_space");


	/* Parameter validation */

	if (!acpi_gbl_root_node) {
		return_ACPI_STATUS (AE_NO_NAMESPACE);
	}

	if (!handle) {
		return_ACPI_STATUS (AE_BAD_PARAMETER);
	}

	/* This function does the real work */

	status = acpi_ns_delete_subtree (handle);

	return_ACPI_STATUS (status);
}
#endif
#endif