xref: /openbmc/linux/drivers/acpi/acpica/tbinstal.c (revision e23feb16)
1 /******************************************************************************
2  *
3  * Module Name: tbinstal - ACPI table installation and removal
4  *
5  *****************************************************************************/
6 
7 /*
8  * Copyright (C) 2000 - 2013, Intel Corp.
9  * All rights reserved.
10  *
11  * Redistribution and use in source and binary forms, with or without
12  * modification, are permitted provided that the following conditions
13  * are met:
14  * 1. Redistributions of source code must retain the above copyright
15  *    notice, this list of conditions, and the following disclaimer,
16  *    without modification.
17  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
18  *    substantially similar to the "NO WARRANTY" disclaimer below
19  *    ("Disclaimer") and any redistribution must be conditioned upon
20  *    including a substantially similar Disclaimer requirement for further
21  *    binary redistribution.
22  * 3. Neither the names of the above-listed copyright holders nor the names
23  *    of any contributors may be used to endorse or promote products derived
24  *    from this software without specific prior written permission.
25  *
26  * Alternatively, this software may be distributed under the terms of the
27  * GNU General Public License ("GPL") version 2 as published by the Free
28  * Software Foundation.
29  *
30  * NO WARRANTY
31  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
32  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
33  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
34  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
35  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
36  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
37  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
38  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
39  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
40  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
41  * POSSIBILITY OF SUCH DAMAGES.
42  */
43 
44 #include <acpi/acpi.h>
45 #include "accommon.h"
46 #include "acnamesp.h"
47 #include "actables.h"
48 
49 #define _COMPONENT          ACPI_TABLES
50 ACPI_MODULE_NAME("tbinstal")
51 
52 /******************************************************************************
53  *
54  * FUNCTION:    acpi_tb_verify_table
55  *
56  * PARAMETERS:  table_desc          - table
57  *
58  * RETURN:      Status
59  *
60  * DESCRIPTION: this function is called to verify and map table
61  *
62  *****************************************************************************/
63 acpi_status acpi_tb_verify_table(struct acpi_table_desc *table_desc)
64 {
65 	acpi_status status = AE_OK;
66 
67 	ACPI_FUNCTION_TRACE(tb_verify_table);
68 
69 	/* Map the table if necessary */
70 
71 	if (!table_desc->pointer) {
72 		if ((table_desc->flags & ACPI_TABLE_ORIGIN_MASK) ==
73 		    ACPI_TABLE_ORIGIN_MAPPED) {
74 			table_desc->pointer =
75 			    acpi_os_map_memory(table_desc->address,
76 					       table_desc->length);
77 		}
78 		if (!table_desc->pointer) {
79 			return_ACPI_STATUS(AE_NO_MEMORY);
80 		}
81 	}
82 
83 	/* FACS is the odd table, has no standard ACPI header and no checksum */
84 
85 	if (!ACPI_COMPARE_NAME(&table_desc->signature, ACPI_SIG_FACS)) {
86 
87 		/* Always calculate checksum, ignore bad checksum if requested */
88 
89 		status =
90 		    acpi_tb_verify_checksum(table_desc->pointer,
91 					    table_desc->length);
92 	}
93 
94 	return_ACPI_STATUS(status);
95 }
96 
97 /*******************************************************************************
98  *
99  * FUNCTION:    acpi_tb_add_table
100  *
101  * PARAMETERS:  table_desc          - Table descriptor
102  *              table_index         - Where the table index is returned
103  *
104  * RETURN:      Status
105  *
106  * DESCRIPTION: This function is called to add an ACPI table. It is used to
107  *              dynamically load tables via the Load and load_table AML
108  *              operators.
109  *
110  ******************************************************************************/
111 
112 acpi_status
113 acpi_tb_add_table(struct acpi_table_desc *table_desc, u32 *table_index)
114 {
115 	u32 i;
116 	acpi_status status = AE_OK;
117 
118 	ACPI_FUNCTION_TRACE(tb_add_table);
119 
120 	if (!table_desc->pointer) {
121 		status = acpi_tb_verify_table(table_desc);
122 		if (ACPI_FAILURE(status) || !table_desc->pointer) {
123 			return_ACPI_STATUS(status);
124 		}
125 	}
126 
127 	/*
128 	 * Validate the incoming table signature.
129 	 *
130 	 * 1) Originally, we checked the table signature for "SSDT" or "PSDT".
131 	 * 2) We added support for OEMx tables, signature "OEM".
132 	 * 3) Valid tables were encountered with a null signature, so we just
133 	 *    gave up on validating the signature, (05/2008).
134 	 * 4) We encountered non-AML tables such as the MADT, which caused
135 	 *    interpreter errors and kernel faults. So now, we once again allow
136 	 *    only "SSDT", "OEMx", and now, also a null signature. (05/2011).
137 	 */
138 	if ((table_desc->pointer->signature[0] != 0x00) &&
139 	    (!ACPI_COMPARE_NAME(table_desc->pointer->signature, ACPI_SIG_SSDT))
140 	    && (ACPI_STRNCMP(table_desc->pointer->signature, "OEM", 3))) {
141 		ACPI_BIOS_ERROR((AE_INFO,
142 				 "Table has invalid signature [%4.4s] (0x%8.8X), "
143 				 "must be SSDT or OEMx",
144 				 acpi_ut_valid_acpi_name(table_desc->pointer->
145 							 signature) ?
146 				 table_desc->pointer->signature : "????",
147 				 *(u32 *)table_desc->pointer->signature));
148 
149 		return_ACPI_STATUS(AE_BAD_SIGNATURE);
150 	}
151 
152 	(void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
153 
154 	/* Check if table is already registered */
155 
156 	for (i = 0; i < acpi_gbl_root_table_list.current_table_count; ++i) {
157 		if (!acpi_gbl_root_table_list.tables[i].pointer) {
158 			status =
159 			    acpi_tb_verify_table(&acpi_gbl_root_table_list.
160 						 tables[i]);
161 			if (ACPI_FAILURE(status)
162 			    || !acpi_gbl_root_table_list.tables[i].pointer) {
163 				continue;
164 			}
165 		}
166 
167 		/*
168 		 * Check for a table match on the entire table length,
169 		 * not just the header.
170 		 */
171 		if (table_desc->length !=
172 		    acpi_gbl_root_table_list.tables[i].length) {
173 			continue;
174 		}
175 
176 		if (ACPI_MEMCMP(table_desc->pointer,
177 				acpi_gbl_root_table_list.tables[i].pointer,
178 				acpi_gbl_root_table_list.tables[i].length)) {
179 			continue;
180 		}
181 
182 		/*
183 		 * Note: the current mechanism does not unregister a table if it is
184 		 * dynamically unloaded. The related namespace entries are deleted,
185 		 * but the table remains in the root table list.
186 		 *
187 		 * The assumption here is that the number of different tables that
188 		 * will be loaded is actually small, and there is minimal overhead
189 		 * in just keeping the table in case it is needed again.
190 		 *
191 		 * If this assumption changes in the future (perhaps on large
192 		 * machines with many table load/unload operations), tables will
193 		 * need to be unregistered when they are unloaded, and slots in the
194 		 * root table list should be reused when empty.
195 		 */
196 
197 		/*
198 		 * Table is already registered.
199 		 * We can delete the table that was passed as a parameter.
200 		 */
201 		acpi_tb_delete_table(table_desc);
202 		*table_index = i;
203 
204 		if (acpi_gbl_root_table_list.tables[i].
205 		    flags & ACPI_TABLE_IS_LOADED) {
206 
207 			/* Table is still loaded, this is an error */
208 
209 			status = AE_ALREADY_EXISTS;
210 			goto release;
211 		} else {
212 			/* Table was unloaded, allow it to be reloaded */
213 
214 			table_desc->pointer =
215 			    acpi_gbl_root_table_list.tables[i].pointer;
216 			table_desc->address =
217 			    acpi_gbl_root_table_list.tables[i].address;
218 			status = AE_OK;
219 			goto print_header;
220 		}
221 	}
222 
223 	/*
224 	 * ACPI Table Override:
225 	 * Allow the host to override dynamically loaded tables.
226 	 * NOTE: the table is fully mapped at this point, and the mapping will
227 	 * be deleted by tb_table_override if the table is actually overridden.
228 	 */
229 	(void)acpi_tb_table_override(table_desc->pointer, table_desc);
230 
231 	/* Add the table to the global root table list */
232 
233 	status = acpi_tb_store_table(table_desc->address, table_desc->pointer,
234 				     table_desc->length, table_desc->flags,
235 				     table_index);
236 	if (ACPI_FAILURE(status)) {
237 		goto release;
238 	}
239 
240       print_header:
241 	acpi_tb_print_table_header(table_desc->address, table_desc->pointer);
242 
243       release:
244 	(void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
245 	return_ACPI_STATUS(status);
246 }
247 
248 /*******************************************************************************
249  *
250  * FUNCTION:    acpi_tb_table_override
251  *
252  * PARAMETERS:  table_header        - Header for the original table
253  *              table_desc          - Table descriptor initialized for the
254  *                                    original table. May or may not be mapped.
255  *
256  * RETURN:      Pointer to the entire new table. NULL if table not overridden.
257  *              If overridden, installs the new table within the input table
258  *              descriptor.
259  *
260  * DESCRIPTION: Attempt table override by calling the OSL override functions.
261  *              Note: If the table is overridden, then the entire new table
262  *              is mapped and returned by this function.
263  *
264  ******************************************************************************/
265 
266 struct acpi_table_header *acpi_tb_table_override(struct acpi_table_header
267 						 *table_header,
268 						 struct acpi_table_desc
269 						 *table_desc)
270 {
271 	acpi_status status;
272 	struct acpi_table_header *new_table = NULL;
273 	acpi_physical_address new_address = 0;
274 	u32 new_table_length = 0;
275 	u8 new_flags;
276 	char *override_type;
277 
278 	/* (1) Attempt logical override (returns a logical address) */
279 
280 	status = acpi_os_table_override(table_header, &new_table);
281 	if (ACPI_SUCCESS(status) && new_table) {
282 		new_address = ACPI_PTR_TO_PHYSADDR(new_table);
283 		new_table_length = new_table->length;
284 		new_flags = ACPI_TABLE_ORIGIN_OVERRIDE;
285 		override_type = "Logical";
286 		goto finish_override;
287 	}
288 
289 	/* (2) Attempt physical override (returns a physical address) */
290 
291 	status = acpi_os_physical_table_override(table_header,
292 						 &new_address,
293 						 &new_table_length);
294 	if (ACPI_SUCCESS(status) && new_address && new_table_length) {
295 
296 		/* Map the entire new table */
297 
298 		new_table = acpi_os_map_memory(new_address, new_table_length);
299 		if (!new_table) {
300 			ACPI_EXCEPTION((AE_INFO, AE_NO_MEMORY,
301 					"%4.4s %p Attempted physical table override failed",
302 					table_header->signature,
303 					ACPI_CAST_PTR(void,
304 						      table_desc->address)));
305 			return (NULL);
306 		}
307 
308 		override_type = "Physical";
309 		new_flags = ACPI_TABLE_ORIGIN_MAPPED;
310 		goto finish_override;
311 	}
312 
313 	return (NULL);		/* There was no override */
314 
315       finish_override:
316 
317 	ACPI_INFO((AE_INFO,
318 		   "%4.4s %p %s table override, new table: %p",
319 		   table_header->signature,
320 		   ACPI_CAST_PTR(void, table_desc->address),
321 		   override_type, new_table));
322 
323 	/* We can now unmap/delete the original table (if fully mapped) */
324 
325 	acpi_tb_delete_table(table_desc);
326 
327 	/* Setup descriptor for the new table */
328 
329 	table_desc->address = new_address;
330 	table_desc->pointer = new_table;
331 	table_desc->length = new_table_length;
332 	table_desc->flags = new_flags;
333 
334 	return (new_table);
335 }
336 
337 /*******************************************************************************
338  *
339  * FUNCTION:    acpi_tb_resize_root_table_list
340  *
341  * PARAMETERS:  None
342  *
343  * RETURN:      Status
344  *
345  * DESCRIPTION: Expand the size of global table array
346  *
347  ******************************************************************************/
348 
349 acpi_status acpi_tb_resize_root_table_list(void)
350 {
351 	struct acpi_table_desc *tables;
352 	u32 table_count;
353 
354 	ACPI_FUNCTION_TRACE(tb_resize_root_table_list);
355 
356 	/* allow_resize flag is a parameter to acpi_initialize_tables */
357 
358 	if (!(acpi_gbl_root_table_list.flags & ACPI_ROOT_ALLOW_RESIZE)) {
359 		ACPI_ERROR((AE_INFO,
360 			    "Resize of Root Table Array is not allowed"));
361 		return_ACPI_STATUS(AE_SUPPORT);
362 	}
363 
364 	/* Increase the Table Array size */
365 
366 	if (acpi_gbl_root_table_list.flags & ACPI_ROOT_ORIGIN_ALLOCATED) {
367 		table_count = acpi_gbl_root_table_list.max_table_count;
368 	} else {
369 		table_count = acpi_gbl_root_table_list.current_table_count;
370 	}
371 
372 	tables = ACPI_ALLOCATE_ZEROED(((acpi_size) table_count +
373 				       ACPI_ROOT_TABLE_SIZE_INCREMENT) *
374 				      sizeof(struct acpi_table_desc));
375 	if (!tables) {
376 		ACPI_ERROR((AE_INFO,
377 			    "Could not allocate new root table array"));
378 		return_ACPI_STATUS(AE_NO_MEMORY);
379 	}
380 
381 	/* Copy and free the previous table array */
382 
383 	if (acpi_gbl_root_table_list.tables) {
384 		ACPI_MEMCPY(tables, acpi_gbl_root_table_list.tables,
385 			    (acpi_size) table_count *
386 			    sizeof(struct acpi_table_desc));
387 
388 		if (acpi_gbl_root_table_list.flags & ACPI_ROOT_ORIGIN_ALLOCATED) {
389 			ACPI_FREE(acpi_gbl_root_table_list.tables);
390 		}
391 	}
392 
393 	acpi_gbl_root_table_list.tables = tables;
394 	acpi_gbl_root_table_list.max_table_count =
395 	    table_count + ACPI_ROOT_TABLE_SIZE_INCREMENT;
396 	acpi_gbl_root_table_list.flags |= ACPI_ROOT_ORIGIN_ALLOCATED;
397 
398 	return_ACPI_STATUS(AE_OK);
399 }
400 
401 /*******************************************************************************
402  *
403  * FUNCTION:    acpi_tb_store_table
404  *
405  * PARAMETERS:  address             - Table address
406  *              table               - Table header
407  *              length              - Table length
408  *              flags               - flags
409  *
410  * RETURN:      Status and table index.
411  *
412  * DESCRIPTION: Add an ACPI table to the global table list
413  *
414  ******************************************************************************/
415 
416 acpi_status
417 acpi_tb_store_table(acpi_physical_address address,
418 		    struct acpi_table_header *table,
419 		    u32 length, u8 flags, u32 *table_index)
420 {
421 	acpi_status status;
422 	struct acpi_table_desc *new_table;
423 
424 	/* Ensure that there is room for the table in the Root Table List */
425 
426 	if (acpi_gbl_root_table_list.current_table_count >=
427 	    acpi_gbl_root_table_list.max_table_count) {
428 		status = acpi_tb_resize_root_table_list();
429 		if (ACPI_FAILURE(status)) {
430 			return (status);
431 		}
432 	}
433 
434 	new_table =
435 	    &acpi_gbl_root_table_list.tables[acpi_gbl_root_table_list.
436 					     current_table_count];
437 
438 	/* Initialize added table */
439 
440 	new_table->address = address;
441 	new_table->pointer = table;
442 	new_table->length = length;
443 	new_table->owner_id = 0;
444 	new_table->flags = flags;
445 
446 	ACPI_MOVE_32_TO_32(&new_table->signature, table->signature);
447 
448 	*table_index = acpi_gbl_root_table_list.current_table_count;
449 	acpi_gbl_root_table_list.current_table_count++;
450 	return (AE_OK);
451 }
452 
453 /*******************************************************************************
454  *
455  * FUNCTION:    acpi_tb_delete_table
456  *
457  * PARAMETERS:  table_index         - Table index
458  *
459  * RETURN:      None
460  *
461  * DESCRIPTION: Delete one internal ACPI table
462  *
463  ******************************************************************************/
464 
465 void acpi_tb_delete_table(struct acpi_table_desc *table_desc)
466 {
467 	/* Table must be mapped or allocated */
468 	if (!table_desc->pointer) {
469 		return;
470 	}
471 	switch (table_desc->flags & ACPI_TABLE_ORIGIN_MASK) {
472 	case ACPI_TABLE_ORIGIN_MAPPED:
473 
474 		acpi_os_unmap_memory(table_desc->pointer, table_desc->length);
475 		break;
476 
477 	case ACPI_TABLE_ORIGIN_ALLOCATED:
478 
479 		ACPI_FREE(table_desc->pointer);
480 		break;
481 
482 		/* Not mapped or allocated, there is nothing we can do */
483 
484 	default:
485 
486 		return;
487 	}
488 
489 	table_desc->pointer = NULL;
490 }
491 
492 /*******************************************************************************
493  *
494  * FUNCTION:    acpi_tb_terminate
495  *
496  * PARAMETERS:  None
497  *
498  * RETURN:      None
499  *
500  * DESCRIPTION: Delete all internal ACPI tables
501  *
502  ******************************************************************************/
503 
504 void acpi_tb_terminate(void)
505 {
506 	u32 i;
507 
508 	ACPI_FUNCTION_TRACE(tb_terminate);
509 
510 	(void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
511 
512 	/* Delete the individual tables */
513 
514 	for (i = 0; i < acpi_gbl_root_table_list.current_table_count; i++) {
515 		acpi_tb_delete_table(&acpi_gbl_root_table_list.tables[i]);
516 	}
517 
518 	/*
519 	 * Delete the root table array if allocated locally. Array cannot be
520 	 * mapped, so we don't need to check for that flag.
521 	 */
522 	if (acpi_gbl_root_table_list.flags & ACPI_ROOT_ORIGIN_ALLOCATED) {
523 		ACPI_FREE(acpi_gbl_root_table_list.tables);
524 	}
525 
526 	acpi_gbl_root_table_list.tables = NULL;
527 	acpi_gbl_root_table_list.flags = 0;
528 	acpi_gbl_root_table_list.current_table_count = 0;
529 
530 	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "ACPI Tables freed\n"));
531 	(void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
532 
533 	return_VOID;
534 }
535 
536 /*******************************************************************************
537  *
538  * FUNCTION:    acpi_tb_delete_namespace_by_owner
539  *
540  * PARAMETERS:  table_index         - Table index
541  *
542  * RETURN:      Status
543  *
544  * DESCRIPTION: Delete all namespace objects created when this table was loaded.
545  *
546  ******************************************************************************/
547 
548 acpi_status acpi_tb_delete_namespace_by_owner(u32 table_index)
549 {
550 	acpi_owner_id owner_id;
551 	acpi_status status;
552 
553 	ACPI_FUNCTION_TRACE(tb_delete_namespace_by_owner);
554 
555 	status = acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
556 	if (ACPI_FAILURE(status)) {
557 		return_ACPI_STATUS(status);
558 	}
559 
560 	if (table_index >= acpi_gbl_root_table_list.current_table_count) {
561 
562 		/* The table index does not exist */
563 
564 		(void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
565 		return_ACPI_STATUS(AE_NOT_EXIST);
566 	}
567 
568 	/* Get the owner ID for this table, used to delete namespace nodes */
569 
570 	owner_id = acpi_gbl_root_table_list.tables[table_index].owner_id;
571 	(void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
572 
573 	/*
574 	 * Need to acquire the namespace writer lock to prevent interference
575 	 * with any concurrent namespace walks. The interpreter must be
576 	 * released during the deletion since the acquisition of the deletion
577 	 * lock may block, and also since the execution of a namespace walk
578 	 * must be allowed to use the interpreter.
579 	 */
580 	(void)acpi_ut_release_mutex(ACPI_MTX_INTERPRETER);
581 	status = acpi_ut_acquire_write_lock(&acpi_gbl_namespace_rw_lock);
582 
583 	acpi_ns_delete_namespace_by_owner(owner_id);
584 	if (ACPI_FAILURE(status)) {
585 		return_ACPI_STATUS(status);
586 	}
587 
588 	acpi_ut_release_write_lock(&acpi_gbl_namespace_rw_lock);
589 
590 	status = acpi_ut_acquire_mutex(ACPI_MTX_INTERPRETER);
591 	return_ACPI_STATUS(status);
592 }
593 
594 /*******************************************************************************
595  *
596  * FUNCTION:    acpi_tb_allocate_owner_id
597  *
598  * PARAMETERS:  table_index         - Table index
599  *
600  * RETURN:      Status
601  *
602  * DESCRIPTION: Allocates owner_id in table_desc
603  *
604  ******************************************************************************/
605 
606 acpi_status acpi_tb_allocate_owner_id(u32 table_index)
607 {
608 	acpi_status status = AE_BAD_PARAMETER;
609 
610 	ACPI_FUNCTION_TRACE(tb_allocate_owner_id);
611 
612 	(void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
613 	if (table_index < acpi_gbl_root_table_list.current_table_count) {
614 		status = acpi_ut_allocate_owner_id
615 		    (&(acpi_gbl_root_table_list.tables[table_index].owner_id));
616 	}
617 
618 	(void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
619 	return_ACPI_STATUS(status);
620 }
621 
622 /*******************************************************************************
623  *
624  * FUNCTION:    acpi_tb_release_owner_id
625  *
626  * PARAMETERS:  table_index         - Table index
627  *
628  * RETURN:      Status
629  *
630  * DESCRIPTION: Releases owner_id in table_desc
631  *
632  ******************************************************************************/
633 
634 acpi_status acpi_tb_release_owner_id(u32 table_index)
635 {
636 	acpi_status status = AE_BAD_PARAMETER;
637 
638 	ACPI_FUNCTION_TRACE(tb_release_owner_id);
639 
640 	(void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
641 	if (table_index < acpi_gbl_root_table_list.current_table_count) {
642 		acpi_ut_release_owner_id(&
643 					 (acpi_gbl_root_table_list.
644 					  tables[table_index].owner_id));
645 		status = AE_OK;
646 	}
647 
648 	(void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
649 	return_ACPI_STATUS(status);
650 }
651 
652 /*******************************************************************************
653  *
654  * FUNCTION:    acpi_tb_get_owner_id
655  *
656  * PARAMETERS:  table_index         - Table index
657  *              owner_id            - Where the table owner_id is returned
658  *
659  * RETURN:      Status
660  *
661  * DESCRIPTION: returns owner_id for the ACPI table
662  *
663  ******************************************************************************/
664 
665 acpi_status acpi_tb_get_owner_id(u32 table_index, acpi_owner_id *owner_id)
666 {
667 	acpi_status status = AE_BAD_PARAMETER;
668 
669 	ACPI_FUNCTION_TRACE(tb_get_owner_id);
670 
671 	(void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
672 	if (table_index < acpi_gbl_root_table_list.current_table_count) {
673 		*owner_id =
674 		    acpi_gbl_root_table_list.tables[table_index].owner_id;
675 		status = AE_OK;
676 	}
677 
678 	(void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
679 	return_ACPI_STATUS(status);
680 }
681 
682 /*******************************************************************************
683  *
684  * FUNCTION:    acpi_tb_is_table_loaded
685  *
686  * PARAMETERS:  table_index         - Table index
687  *
688  * RETURN:      Table Loaded Flag
689  *
690  ******************************************************************************/
691 
692 u8 acpi_tb_is_table_loaded(u32 table_index)
693 {
694 	u8 is_loaded = FALSE;
695 
696 	(void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
697 	if (table_index < acpi_gbl_root_table_list.current_table_count) {
698 		is_loaded = (u8)
699 		    (acpi_gbl_root_table_list.tables[table_index].flags &
700 		     ACPI_TABLE_IS_LOADED);
701 	}
702 
703 	(void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
704 	return (is_loaded);
705 }
706 
707 /*******************************************************************************
708  *
709  * FUNCTION:    acpi_tb_set_table_loaded_flag
710  *
711  * PARAMETERS:  table_index         - Table index
712  *              is_loaded           - TRUE if table is loaded, FALSE otherwise
713  *
714  * RETURN:      None
715  *
716  * DESCRIPTION: Sets the table loaded flag to either TRUE or FALSE.
717  *
718  ******************************************************************************/
719 
720 void acpi_tb_set_table_loaded_flag(u32 table_index, u8 is_loaded)
721 {
722 
723 	(void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
724 	if (table_index < acpi_gbl_root_table_list.current_table_count) {
725 		if (is_loaded) {
726 			acpi_gbl_root_table_list.tables[table_index].flags |=
727 			    ACPI_TABLE_IS_LOADED;
728 		} else {
729 			acpi_gbl_root_table_list.tables[table_index].flags &=
730 			    ~ACPI_TABLE_IS_LOADED;
731 		}
732 	}
733 
734 	(void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
735 }
736