summaryrefslogtreecommitdiff
path: root/drivers/acpi/acpica/tbinstal.c
blob: 755b90c40ddf0eb469304a4016768ca1719d0337 (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
/******************************************************************************
 *
 * Module Name: tbinstal - ACPI table installation and removal
 *
 *****************************************************************************/

/*
 * Copyright (C) 2000 - 2014, Intel Corp.
 * 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 "accommon.h"
#include "actables.h"

#define _COMPONENT          ACPI_TABLES
ACPI_MODULE_NAME("tbinstal")

/* Local prototypes */
static u8
acpi_tb_compare_tables(struct acpi_table_desc *table_desc, u32 table_index);

/*******************************************************************************
 *
 * FUNCTION:    acpi_tb_compare_tables
 *
 * PARAMETERS:  table_desc          - Table 1 descriptor to be compared
 *              table_index         - Index of table 2 to be compared
 *
 * RETURN:      TRUE if both tables are identical.
 *
 * DESCRIPTION: This function compares a table with another table that has
 *              already been installed in the root table list.
 *
 ******************************************************************************/

static u8
acpi_tb_compare_tables(struct acpi_table_desc *table_desc, u32 table_index)
{
	acpi_status status = AE_OK;
	u8 is_identical;
	struct acpi_table_header *table;
	u32 table_length;
	u8 table_flags;

	status =
	    acpi_tb_acquire_table(&acpi_gbl_root_table_list.tables[table_index],
				  &table, &table_length, &table_flags);
	if (ACPI_FAILURE(status)) {
		return (FALSE);
	}

	/*
	 * Check for a table match on the entire table length,
	 * not just the header.
	 */
	is_identical = (u8)((table_desc->length != table_length ||
			     ACPI_MEMCMP(table_desc->pointer, table,
					 table_length)) ? FALSE : TRUE);

	/* Release the acquired table */

	acpi_tb_release_table(table, table_length, table_flags);
	return (is_identical);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_tb_install_table_with_override
 *
 * PARAMETERS:  table_index             - Index into root table array
 *              new_table_desc          - New table descriptor to install
 *              override                - Whether override should be performed
 *
 * RETURN:      None
 *
 * DESCRIPTION: Install an ACPI table into the global data structure. The
 *              table override mechanism is called to allow the host
 *              OS to replace any table before it is installed in the root
 *              table array.
 *
 ******************************************************************************/

void
acpi_tb_install_table_with_override(u32 table_index,
				    struct acpi_table_desc *new_table_desc,
				    u8 override)
{

	if (table_index >= acpi_gbl_root_table_list.current_table_count) {
		return;
	}

	/*
	 * ACPI Table Override:
	 *
	 * Before we install the table, let the host OS override it with a new
	 * one if desired. Any table within the RSDT/XSDT can be replaced,
	 * including the DSDT which is pointed to by the FADT.
	 */
	if (override) {
		acpi_tb_override_table(new_table_desc);
	}

	acpi_tb_init_table_descriptor(&acpi_gbl_root_table_list.
				      tables[table_index],
				      new_table_desc->address,
				      new_table_desc->flags,
				      new_table_desc->pointer);

	acpi_tb_print_table_header(new_table_desc->address,
				   new_table_desc->pointer);

	/* Set the global integer width (based upon revision of the DSDT) */

	if (table_index == ACPI_TABLE_INDEX_DSDT) {
		acpi_ut_set_integer_width(new_table_desc->pointer->revision);
	}
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_tb_install_fixed_table
 *
 * PARAMETERS:  address                 - Physical address of DSDT or FACS
 *              signature               - Table signature, NULL if no need to
 *                                        match
 *              table_index             - Index into root table array
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Install a fixed ACPI table (DSDT/FACS) into the global data
 *              structure.
 *
 ******************************************************************************/

acpi_status
acpi_tb_install_fixed_table(acpi_physical_address address,
			    char *signature, u32 table_index)
{
	struct acpi_table_desc new_table_desc;
	acpi_status status;

	ACPI_FUNCTION_TRACE(tb_install_fixed_table);

	if (!address) {
		ACPI_ERROR((AE_INFO,
			    "Null physical address for ACPI table [%s]",
			    signature));
		return (AE_NO_MEMORY);
	}

	/* Fill a table descriptor for validation */

	status = acpi_tb_acquire_temp_table(&new_table_desc, address,
					    ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL);
	if (ACPI_FAILURE(status)) {
		ACPI_ERROR((AE_INFO, "Could not acquire table length at %p",
			    ACPI_CAST_PTR(void, address)));
		return_ACPI_STATUS(status);
	}

	/* Validate and verify a table before installation */

	status = acpi_tb_verify_temp_table(&new_table_desc, signature);
	if (ACPI_FAILURE(status)) {
		goto release_and_exit;
	}

	acpi_tb_install_table_with_override(table_index, &new_table_desc, TRUE);

release_and_exit:

	/* Release the temporary table descriptor */

	acpi_tb_release_temp_table(&new_table_desc);
	return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_tb_install_standard_table
 *
 * PARAMETERS:  address             - Address of the table (might be a virtual
 *                                    address depending on the table_flags)
 *              flags               - Flags for the table
 *              reload              - Whether reload should be performed
 *              override            - Whether override should be performed
 *              table_index         - Where the table index is returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: This function is called to install an ACPI table that is
 *              neither DSDT nor FACS (a "standard" table.)
 *              When this function is called by "Load" or "LoadTable" opcodes,
 *              or by acpi_load_table() API, the "Reload" parameter is set.
 *              After sucessfully returning from this function, table is
 *              "INSTALLED" but not "VALIDATED".
 *
 ******************************************************************************/

acpi_status
acpi_tb_install_standard_table(acpi_physical_address address,
			       u8 flags,
			       u8 reload, u8 override, u32 *table_index)
{
	u32 i;
	acpi_status status = AE_OK;
	struct acpi_table_desc new_table_desc;

	ACPI_FUNCTION_TRACE(tb_install_standard_table);

	/* Acquire a temporary table descriptor for validation */

	status = acpi_tb_acquire_temp_table(&new_table_desc, address, flags);
	if (ACPI_FAILURE(status)) {
		ACPI_ERROR((AE_INFO, "Could not acquire table length at %p",
			    ACPI_CAST_PTR(void, address)));
		return_ACPI_STATUS(status);
	}

	/*
	 * Optionally do not load any SSDTs from the RSDT/XSDT. This can
	 * be useful for debugging ACPI problems on some machines.
	 */
	if (!reload &&
	    acpi_gbl_disable_ssdt_table_install &&
	    ACPI_COMPARE_NAME(&new_table_desc.signature, ACPI_SIG_SSDT)) {
		ACPI_INFO((AE_INFO, "Ignoring installation of %4.4s at %p",
			   new_table_desc.signature.ascii, ACPI_CAST_PTR(void,
									 address)));
		goto release_and_exit;
	}

	/* Validate and verify a table before installation */

	status = acpi_tb_verify_temp_table(&new_table_desc, NULL);
	if (ACPI_FAILURE(status)) {
		goto release_and_exit;
	}

	if (reload) {
		/*
		 * Validate the incoming table signature.
		 *
		 * 1) Originally, we checked the table signature for "SSDT" or "PSDT".
		 * 2) We added support for OEMx tables, signature "OEM".
		 * 3) Valid tables were encountered with a null signature, so we just
		 *    gave up on validating the signature, (05/2008).
		 * 4) We encountered non-AML tables such as the MADT, which caused
		 *    interpreter errors and kernel faults. So now, we once again allow
		 *    only "SSDT", "OEMx", and now, also a null signature. (05/2011).
		 */
		if ((new_table_desc.signature.ascii[0] != 0x00) &&
		    (!ACPI_COMPARE_NAME
		     (&new_table_desc.signature, ACPI_SIG_SSDT))
		    && (ACPI_STRNCMP(new_table_desc.signature.ascii, "OEM", 3)))
		{
			ACPI_BIOS_ERROR((AE_INFO,
					 "Table has invalid signature [%4.4s] (0x%8.8X), "
					 "must be SSDT or OEMx",
					 acpi_ut_valid_acpi_name(new_table_desc.
								 signature.
								 ascii) ?
					 new_table_desc.signature.
					 ascii : "????",
					 new_table_desc.signature.integer));

			status = AE_BAD_SIGNATURE;
			goto release_and_exit;
		}

		/* Check if table is already registered */

		for (i = 0; i < acpi_gbl_root_table_list.current_table_count;
		     ++i) {
			/*
			 * Check for a table match on the entire table length,
			 * not just the header.
			 */
			if (!acpi_tb_compare_tables(&new_table_desc, i)) {
				continue;
			}

			/*
			 * Note: the current mechanism does not unregister a table if it is
			 * dynamically unloaded. The related namespace entries are deleted,
			 * but the table remains in the root table list.
			 *
			 * The assumption here is that the number of different tables that
			 * will be loaded is actually small, and there is minimal overhead
			 * in just keeping the table in case it is needed again.
			 *
			 * If this assumption changes in the future (perhaps on large
			 * machines with many table load/unload operations), tables will
			 * need to be unregistered when they are unloaded, and slots in the
			 * root table list should be reused when empty.
			 */
			if (acpi_gbl_root_table_list.tables[i].
			    flags & ACPI_TABLE_IS_LOADED) {

				/* Table is still loaded, this is an error */

				status = AE_ALREADY_EXISTS;
				goto release_and_exit;
			} else {
				/*
				 * Table was unloaded, allow it to be reloaded.
				 * As we are going to return AE_OK to the caller, we should
				 * take the responsibility of freeing the input descriptor.
				 * Refill the input descriptor to ensure
				 * acpi_tb_install_table_with_override() can be called again to
				 * indicate the re-installation.
				 */
				acpi_tb_uninstall_table(&new_table_desc);
				*table_index = i;
				(void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
				return_ACPI_STATUS(AE_OK);
			}
		}
	}

	/* Add the table to the global root table list */

	status = acpi_tb_get_next_root_index(&i);
	if (ACPI_FAILURE(status)) {
		goto release_and_exit;
	}

	*table_index = i;
	acpi_tb_install_table_with_override(i, &new_table_desc, override);

release_and_exit:

	/* Release the temporary table descriptor */

	acpi_tb_release_temp_table(&new_table_desc);
	return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_tb_override_table
 *
 * PARAMETERS:  old_table_desc      - Validated table descriptor to be
 *                                    overridden
 *
 * RETURN:      None
 *
 * DESCRIPTION: Attempt table override by calling the OSL override functions.
 *              Note: If the table is overridden, then the entire new table
 *              is acquired and returned by this function.
 *              Before/after invocation, the table descriptor is in a state
 *              that is "VALIDATED".
 *
 ******************************************************************************/

void acpi_tb_override_table(struct acpi_table_desc *old_table_desc)
{
	acpi_status status;
	char *override_type;
	struct acpi_table_desc new_table_desc;
	struct acpi_table_header *table;
	acpi_physical_address address;
	u32 length;

	/* (1) Attempt logical override (returns a logical address) */

	status = acpi_os_table_override(old_table_desc->pointer, &table);
	if (ACPI_SUCCESS(status) && table) {
		acpi_tb_acquire_temp_table(&new_table_desc,
					   ACPI_PTR_TO_PHYSADDR(table),
					   ACPI_TABLE_ORIGIN_EXTERNAL_VIRTUAL);
		override_type = "Logical";
		goto finish_override;
	}

	/* (2) Attempt physical override (returns a physical address) */

	status = acpi_os_physical_table_override(old_table_desc->pointer,
						 &address, &length);
	if (ACPI_SUCCESS(status) && address && length) {
		acpi_tb_acquire_temp_table(&new_table_desc, address,
					   ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL);
		override_type = "Physical";
		goto finish_override;
	}

	return;			/* There was no override */

finish_override:

	/* Validate and verify a table before overriding */

	status = acpi_tb_verify_temp_table(&new_table_desc, NULL);
	if (ACPI_FAILURE(status)) {
		return;
	}

	ACPI_INFO((AE_INFO, "%4.4s " ACPI_PRINTF_UINT
		   " %s table override, new table: " ACPI_PRINTF_UINT,
		   old_table_desc->signature.ascii,
		   ACPI_FORMAT_TO_UINT(old_table_desc->address),
		   override_type, ACPI_FORMAT_TO_UINT(new_table_desc.address)));

	/* We can now uninstall the original table */

	acpi_tb_uninstall_table(old_table_desc);

	/*
	 * Replace the original table descriptor and keep its state as
	 * "VALIDATED".
	 */
	acpi_tb_init_table_descriptor(old_table_desc, new_table_desc.address,
				      new_table_desc.flags,
				      new_table_desc.pointer);
	acpi_tb_validate_temp_table(old_table_desc);

	/* Release the temporary table descriptor */

	acpi_tb_release_temp_table(&new_table_desc);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_tb_store_table
 *
 * PARAMETERS:  address             - Table address
 *              table               - Table header
 *              length              - Table length
 *              flags               - Install flags
 *              table_index         - Where the table index is returned
 *
 * RETURN:      Status and table index.
 *
 * DESCRIPTION: Add an ACPI table to the global table list
 *
 ******************************************************************************/

acpi_status
acpi_tb_store_table(acpi_physical_address address,
		    struct acpi_table_header * table,
		    u32 length, u8 flags, u32 *table_index)
{
	acpi_status status;
	struct acpi_table_desc *table_desc;

	status = acpi_tb_get_next_root_index(table_index);
	if (ACPI_FAILURE(status)) {
		return (status);
	}

	/* Initialize added table */

	table_desc = &acpi_gbl_root_table_list.tables[*table_index];
	acpi_tb_init_table_descriptor(table_desc, address, flags, table);
	table_desc->pointer = table;
	return (AE_OK);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_tb_uninstall_table
 *
 * PARAMETERS:  table_desc          - Table descriptor
 *
 * RETURN:      None
 *
 * DESCRIPTION: Delete one internal ACPI table
 *
 ******************************************************************************/

void acpi_tb_uninstall_table(struct acpi_table_desc *table_desc)
{

	ACPI_FUNCTION_TRACE(tb_uninstall_table);

	/* Table must be installed */

	if (!table_desc->address) {
		return_VOID;
	}

	acpi_tb_invalidate_table(table_desc);

	if ((table_desc->flags & ACPI_TABLE_ORIGIN_MASK) ==
	    ACPI_TABLE_ORIGIN_INTERNAL_VIRTUAL) {
		ACPI_FREE(ACPI_CAST_PTR(void, table_desc->address));
	}

	table_desc->address = ACPI_PTR_TO_PHYSADDR(NULL);
	return_VOID;
}