summaryrefslogtreecommitdiffstats
path: root/drivers/acpi/tables/tbinstal.c
blob: ce57a195577a6594801446a32f2ef706e046780e (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
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
/******************************************************************************
 *
 * Module Name: tbinstal - ACPI table installation and removal
 *
 *****************************************************************************/

/*
 * Copyright (C) 2000 - 2006, 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/actables.h>

#define _COMPONENT          ACPI_TABLES
ACPI_MODULE_NAME("tbinstal")

/* Local prototypes */
static acpi_status
acpi_tb_match_signature(char *signature,
			struct acpi_table_desc *table_info, u8 search_type);

/*******************************************************************************
 *
 * FUNCTION:    acpi_tb_match_signature
 *
 * PARAMETERS:  Signature           - Table signature to match
 *              table_info          - Return data
 *              search_type         - Table type to match (primary/secondary)
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Compare signature against the list of "ACPI-subsystem-owned"
 *              tables (DSDT/FADT/SSDT, etc.) Returns the table_type_iD on match.
 *
 ******************************************************************************/

static acpi_status
acpi_tb_match_signature(char *signature,
			struct acpi_table_desc *table_info, u8 search_type)
{
	acpi_native_uint i;

	ACPI_FUNCTION_TRACE("tb_match_signature");

	/* Search for a signature match among the known table types */

	for (i = 0; i < NUM_ACPI_TABLE_TYPES; i++) {
		if (!(acpi_gbl_table_data[i].flags & search_type)) {
			continue;
		}

		if (!ACPI_STRNCMP(signature, acpi_gbl_table_data[i].signature,
				  acpi_gbl_table_data[i].sig_length)) {

			/* Found a signature match, return index if requested */

			if (table_info) {
				table_info->type = (u8) i;
			}

			ACPI_DEBUG_PRINT((ACPI_DB_INFO,
					  "Table [%4.4s] is an ACPI table consumed by the core subsystem\n",
					  (char *)acpi_gbl_table_data[i].
					  signature));

			return_ACPI_STATUS(AE_OK);
		}
	}

	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
			  "Table [%4.4s] is not an ACPI table consumed by the core subsystem - ignored\n",
			  (char *)signature));

	return_ACPI_STATUS(AE_TABLE_NOT_SUPPORTED);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_tb_install_table
 *
 * PARAMETERS:  table_info          - Return value from acpi_tb_get_table_body
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Install the table into the global data structures.
 *
 ******************************************************************************/

acpi_status acpi_tb_install_table(struct acpi_table_desc *table_info)
{
	acpi_status status;

	ACPI_FUNCTION_TRACE("tb_install_table");

	/* Lock tables while installing */

	status = acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
	if (ACPI_FAILURE(status)) {
		ACPI_EXCEPTION((AE_INFO, status,
				"Could not acquire table mutex"));
		return_ACPI_STATUS(status);
	}

	/*
	 * Ignore a table that is already installed. For example, some BIOS
	 * ASL code will repeatedly attempt to load the same SSDT.
	 */
	status = acpi_tb_is_table_installed(table_info);
	if (ACPI_FAILURE(status)) {
		goto unlock_and_exit;
	}

	/* Install the table into the global data structure */

	status = acpi_tb_init_table_descriptor(table_info->type, table_info);
	if (ACPI_FAILURE(status)) {
		ACPI_EXCEPTION((AE_INFO, status,
				"Could not install table [%4.4s]",
				table_info->pointer->signature));
	}

	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "%s located at %p\n",
			  acpi_gbl_table_data[table_info->type].name,
			  table_info->pointer));

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

/*******************************************************************************
 *
 * FUNCTION:    acpi_tb_recognize_table
 *
 * PARAMETERS:  table_info          - Return value from acpi_tb_get_table_body
 *              search_type         - Table type to match (primary/secondary)
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Check a table signature for a match against known table types
 *
 * NOTE:  All table pointers are validated as follows:
 *          1) Table pointer must point to valid physical memory
 *          2) Signature must be 4 ASCII chars, even if we don't recognize the
 *             name
 *          3) Table must be readable for length specified in the header
 *          4) Table checksum must be valid (with the exception of the FACS
 *             which has no checksum for some odd reason)
 *
 ******************************************************************************/

acpi_status
acpi_tb_recognize_table(struct acpi_table_desc *table_info, u8 search_type)
{
	struct acpi_table_header *table_header;
	acpi_status status;

	ACPI_FUNCTION_TRACE("tb_recognize_table");

	/* Ensure that we have a valid table pointer */

	table_header = (struct acpi_table_header *)table_info->pointer;
	if (!table_header) {
		return_ACPI_STATUS(AE_BAD_PARAMETER);
	}

	/*
	 * We only "recognize" a limited number of ACPI tables -- namely, the
	 * ones that are used by the subsystem (DSDT, FADT, etc.)
	 *
	 * An AE_TABLE_NOT_SUPPORTED means that the table was not recognized.
	 * This can be any one of many valid ACPI tables, it just isn't one of
	 * the tables that is consumed by the core subsystem
	 */
	status = acpi_tb_match_signature(table_header->signature,
					 table_info, search_type);
	if (ACPI_FAILURE(status)) {
		return_ACPI_STATUS(status);
	}

	status = acpi_tb_validate_table_header(table_header);
	if (ACPI_FAILURE(status)) {
		return_ACPI_STATUS(status);
	}

	/* Return the table type and length via the info struct */

	table_info->length = (acpi_size) table_header->length;

	return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_tb_init_table_descriptor
 *
 * PARAMETERS:  table_type          - The type of the table
 *              table_info          - A table info struct
 *
 * RETURN:      None.
 *
 * DESCRIPTION: Install a table into the global data structs.
 *
 ******************************************************************************/

acpi_status
acpi_tb_init_table_descriptor(acpi_table_type table_type,
			      struct acpi_table_desc *table_info)
{
	struct acpi_table_list *list_head;
	struct acpi_table_desc *table_desc;
	acpi_status status;

	ACPI_FUNCTION_TRACE_U32("tb_init_table_descriptor", table_type);

	/* Allocate a descriptor for this table */

	table_desc = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_table_desc));
	if (!table_desc) {
		return_ACPI_STATUS(AE_NO_MEMORY);
	}

	/* Get a new owner ID for the table */

	status = acpi_ut_allocate_owner_id(&table_desc->owner_id);
	if (ACPI_FAILURE(status)) {
		return_ACPI_STATUS(status);
	}

	/* Install the table into the global data structure */

	list_head = &acpi_gbl_table_lists[table_type];

	/*
	 * Two major types of tables:  1) Only one instance is allowed.  This
	 * includes most ACPI tables such as the DSDT.  2) Multiple instances of
	 * the table are allowed.  This includes SSDT and PSDTs.
	 */
	if (ACPI_IS_SINGLE_TABLE(acpi_gbl_table_data[table_type].flags)) {
		/*
		 * Only one table allowed, and a table has alread been installed
		 * at this location, so return an error.
		 */
		if (list_head->next) {
			ACPI_FREE(table_desc);
			return_ACPI_STATUS(AE_ALREADY_EXISTS);
		}

		table_desc->next = list_head->next;
		list_head->next = table_desc;

		if (table_desc->next) {
			table_desc->next->prev = table_desc;
		}

		list_head->count++;
	} else {
		/*
		 * Link the new table in to the list of tables of this type.
		 * Insert at the end of the list, order IS IMPORTANT.
		 *
		 * table_desc->Prev & Next are already NULL from calloc()
		 */
		list_head->count++;

		if (!list_head->next) {
			list_head->next = table_desc;
		} else {
			table_desc->next = list_head->next;

			while (table_desc->next->next) {
				table_desc->next = table_desc->next->next;
			}

			table_desc->next->next = table_desc;
			table_desc->prev = table_desc->next;
			table_desc->next = NULL;
		}
	}

	/* Finish initialization of the table descriptor */

	table_desc->type = (u8) table_type;
	table_desc->pointer = table_info->pointer;
	table_desc->length = table_info->length;
	table_desc->allocation = table_info->allocation;
	table_desc->aml_start = (u8 *) (table_desc->pointer + 1),
	    table_desc->aml_length = (u32) (table_desc->length -
					    (u32) sizeof(struct
							 acpi_table_header));
	table_desc->loaded_into_namespace = FALSE;

	/*
	 * Set the appropriate global pointer (if there is one) to point to the
	 * newly installed table
	 */
	if (acpi_gbl_table_data[table_type].global_ptr) {
		*(acpi_gbl_table_data[table_type].global_ptr) =
		    table_info->pointer;
	}

	/* Return Data */

	table_info->owner_id = table_desc->owner_id;
	table_info->installed_desc = table_desc;

	return_ACPI_STATUS(AE_OK);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_tb_delete_all_tables
 *
 * PARAMETERS:  None.
 *
 * RETURN:      None.
 *
 * DESCRIPTION: Delete all internal ACPI tables
 *
 ******************************************************************************/

void acpi_tb_delete_all_tables(void)
{
	acpi_table_type type;

	/*
	 * Free memory allocated for ACPI tables
	 * Memory can either be mapped or allocated
	 */
	for (type = 0; type < NUM_ACPI_TABLE_TYPES; type++) {
		acpi_tb_delete_tables_by_type(type);
	}
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_tb_delete_tables_by_type
 *
 * PARAMETERS:  Type                - The table type to be deleted
 *
 * RETURN:      None.
 *
 * DESCRIPTION: Delete an internal ACPI table
 *              Locks the ACPI table mutex
 *
 ******************************************************************************/

void acpi_tb_delete_tables_by_type(acpi_table_type type)
{
	struct acpi_table_desc *table_desc;
	u32 count;
	u32 i;

	ACPI_FUNCTION_TRACE_U32("tb_delete_tables_by_type", type);

	if (type > ACPI_TABLE_MAX) {
		return_VOID;
	}

	if (ACPI_FAILURE(acpi_ut_acquire_mutex(ACPI_MTX_TABLES))) {
		return;
	}

	/* Clear the appropriate "typed" global table pointer */

	switch (type) {
	case ACPI_TABLE_RSDP:
		acpi_gbl_RSDP = NULL;
		break;

	case ACPI_TABLE_DSDT:
		acpi_gbl_DSDT = NULL;
		break;

	case ACPI_TABLE_FADT:
		acpi_gbl_FADT = NULL;
		break;

	case ACPI_TABLE_FACS:
		acpi_gbl_FACS = NULL;
		break;

	case ACPI_TABLE_XSDT:
		acpi_gbl_XSDT = NULL;
		break;

	case ACPI_TABLE_SSDT:
	case ACPI_TABLE_PSDT:
	default:
		break;
	}

	/*
	 * Free the table
	 * 1) Get the head of the list
	 */
	table_desc = acpi_gbl_table_lists[type].next;
	count = acpi_gbl_table_lists[type].count;

	/*
	 * 2) Walk the entire list, deleting both the allocated tables
	 *    and the table descriptors
	 */
	for (i = 0; i < count; i++) {
		table_desc = acpi_tb_uninstall_table(table_desc);
	}

	(void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
	return_VOID;
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_tb_delete_single_table
 *
 * PARAMETERS:  table_info          - A table info struct
 *
 * RETURN:      None.
 *
 * DESCRIPTION: Low-level free for a single ACPI table.  Handles cases where
 *              the table was allocated a buffer or was mapped.
 *
 ******************************************************************************/

void acpi_tb_delete_single_table(struct acpi_table_desc *table_desc)
{

	/* Must have a valid table descriptor and pointer */

	if ((!table_desc) || (!table_desc->pointer)) {
		return;
	}

	/* Valid table, determine type of memory allocation */

	switch (table_desc->allocation) {
	case ACPI_MEM_NOT_ALLOCATED:
		break;

	case ACPI_MEM_ALLOCATED:

		ACPI_FREE(table_desc->pointer);
		break;

	case ACPI_MEM_MAPPED:

		acpi_os_unmap_memory(table_desc->pointer, table_desc->length);
		break;

	default:
		break;
	}
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_tb_uninstall_table
 *
 * PARAMETERS:  table_info          - A table info struct
 *
 * RETURN:      Pointer to the next table in the list (of same type)
 *
 * DESCRIPTION: Free the memory associated with an internal ACPI table that
 *              is either installed or has never been installed.
 *              Table mutex should be locked.
 *
 ******************************************************************************/

struct acpi_table_desc *acpi_tb_uninstall_table(struct acpi_table_desc
						*table_desc)
{
	struct acpi_table_desc *next_desc;

	ACPI_FUNCTION_TRACE_PTR("tb_uninstall_table", table_desc);

	if (!table_desc) {
		return_PTR(NULL);
	}

	/* Unlink the descriptor from the doubly linked list */

	if (table_desc->prev) {
		table_desc->prev->next = table_desc->next;
	} else {
		/* Is first on list, update list head */

		acpi_gbl_table_lists[table_desc->type].next = table_desc->next;
	}

	if (table_desc->next) {
		table_desc->next->prev = table_desc->prev;
	}

	/* Free the memory allocated for the table itself */

	acpi_tb_delete_single_table(table_desc);

	/* Free the table descriptor */

	next_desc = table_desc->next;
	ACPI_FREE(table_desc);

	/* Return pointer to the next descriptor */

	return_PTR(next_desc);
}