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/drivers/acpi/tables/tbinstal.c

https://bitbucket.org/evzijst/gittest
C | 553 lines | 228 code | 118 blank | 207 comment | 29 complexity | 9ab2b4e297078a773cf4cad4fb008c5c MD5 | raw file
  1/******************************************************************************
  2 *
  3 * Module Name: tbinstal - ACPI table installation and removal
  4 *
  5 *****************************************************************************/
  6
  7/*
  8 * Copyright (C) 2000 - 2005, R. Byron Moore
  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
 45#include <acpi/acpi.h>
 46#include <acpi/actables.h>
 47
 48
 49#define _COMPONENT          ACPI_TABLES
 50	 ACPI_MODULE_NAME    ("tbinstal")
 51
 52
 53/*******************************************************************************
 54 *
 55 * FUNCTION:    acpi_tb_match_signature
 56 *
 57 * PARAMETERS:  Signature           - Table signature to match
 58 *              table_info          - Return data
 59 *
 60 * RETURN:      Status
 61 *
 62 * DESCRIPTION: Compare signature against the list of "ACPI-subsystem-owned"
 63 *              tables (DSDT/FADT/SSDT, etc.) Returns the table_type_iD on match.
 64 *
 65 ******************************************************************************/
 66
 67acpi_status
 68acpi_tb_match_signature (
 69	char                            *signature,
 70	struct acpi_table_desc          *table_info,
 71	u8                              search_type)
 72{
 73	acpi_native_uint                i;
 74
 75
 76	ACPI_FUNCTION_TRACE ("tb_match_signature");
 77
 78
 79	/*
 80	 * Search for a signature match among the known table types
 81	 */
 82	for (i = 0; i < NUM_ACPI_TABLE_TYPES; i++) {
 83		if (!(acpi_gbl_table_data[i].flags & search_type)) {
 84			continue;
 85		}
 86
 87		if (!ACPI_STRNCMP (signature, acpi_gbl_table_data[i].signature,
 88				   acpi_gbl_table_data[i].sig_length)) {
 89			/* Found a signature match, return index if requested */
 90
 91			if (table_info) {
 92				table_info->type = (u8) i;
 93			}
 94
 95			ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
 96				"Table [%4.4s] is an ACPI table consumed by the core subsystem\n",
 97				(char *) acpi_gbl_table_data[i].signature));
 98
 99			return_ACPI_STATUS (AE_OK);
100		}
101	}
102
103	ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
104		"Table [%4.4s] is not an ACPI table consumed by the core subsystem - ignored\n",
105		(char *) signature));
106
107	return_ACPI_STATUS (AE_TABLE_NOT_SUPPORTED);
108}
109
110
111/*******************************************************************************
112 *
113 * FUNCTION:    acpi_tb_install_table
114 *
115 * PARAMETERS:  table_info          - Return value from acpi_tb_get_table_body
116 *
117 * RETURN:      Status
118 *
119 * DESCRIPTION: Load and validate all tables other than the RSDT.  The RSDT must
120 *              already be loaded and validated.
121 *              Install the table into the global data structs.
122 *
123 ******************************************************************************/
124
125acpi_status
126acpi_tb_install_table (
127	struct acpi_table_desc          *table_info)
128{
129	acpi_status                     status;
130
131	ACPI_FUNCTION_TRACE ("tb_install_table");
132
133
134	/* Lock tables while installing */
135
136	status = acpi_ut_acquire_mutex (ACPI_MTX_TABLES);
137	if (ACPI_FAILURE (status)) {
138		ACPI_REPORT_ERROR (("Could not acquire table mutex for [%4.4s], %s\n",
139			table_info->pointer->signature, acpi_format_exception (status)));
140		return_ACPI_STATUS (status);
141	}
142
143	/* Install the table into the global data structure */
144
145	status = acpi_tb_init_table_descriptor (table_info->type, table_info);
146	if (ACPI_FAILURE (status)) {
147		ACPI_REPORT_ERROR (("Could not install ACPI table [%4.4s], %s\n",
148			table_info->pointer->signature, acpi_format_exception (status)));
149	}
150
151	ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "%s located at %p\n",
152		acpi_gbl_table_data[table_info->type].name, table_info->pointer));
153
154	(void) acpi_ut_release_mutex (ACPI_MTX_TABLES);
155	return_ACPI_STATUS (status);
156}
157
158
159/*******************************************************************************
160 *
161 * FUNCTION:    acpi_tb_recognize_table
162 *
163 * PARAMETERS:  table_info          - Return value from acpi_tb_get_table_body
164 *
165 * RETURN:      Status
166 *
167 * DESCRIPTION: Check a table signature for a match against known table types
168 *
169 * NOTE:  All table pointers are validated as follows:
170 *          1) Table pointer must point to valid physical memory
171 *          2) Signature must be 4 ASCII chars, even if we don't recognize the
172 *             name
173 *          3) Table must be readable for length specified in the header
174 *          4) Table checksum must be valid (with the exception of the FACS
175 *             which has no checksum for some odd reason)
176 *
177 ******************************************************************************/
178
179acpi_status
180acpi_tb_recognize_table (
181	struct acpi_table_desc          *table_info,
182	u8                              search_type)
183{
184	struct acpi_table_header        *table_header;
185	acpi_status                     status;
186
187
188	ACPI_FUNCTION_TRACE ("tb_recognize_table");
189
190
191	/* Ensure that we have a valid table pointer */
192
193	table_header = (struct acpi_table_header *) table_info->pointer;
194	if (!table_header) {
195		return_ACPI_STATUS (AE_BAD_PARAMETER);
196	}
197
198	/*
199	 * We only "recognize" a limited number of ACPI tables -- namely, the
200	 * ones that are used by the subsystem (DSDT, FADT, etc.)
201	 *
202	 * An AE_TABLE_NOT_SUPPORTED means that the table was not recognized.
203	 * This can be any one of many valid ACPI tables, it just isn't one of
204	 * the tables that is consumed by the core subsystem
205	 */
206	status = acpi_tb_match_signature (table_header->signature, table_info, search_type);
207	if (ACPI_FAILURE (status)) {
208		return_ACPI_STATUS (status);
209	}
210
211	status = acpi_tb_validate_table_header (table_header);
212	if (ACPI_FAILURE (status)) {
213		return_ACPI_STATUS (status);
214	}
215
216	/* Return the table type and length via the info struct */
217
218	table_info->length = (acpi_size) table_header->length;
219
220	return_ACPI_STATUS (status);
221}
222
223
224/*******************************************************************************
225 *
226 * FUNCTION:    acpi_tb_init_table_descriptor
227 *
228 * PARAMETERS:  table_type          - The type of the table
229 *              table_info          - A table info struct
230 *
231 * RETURN:      None.
232 *
233 * DESCRIPTION: Install a table into the global data structs.
234 *
235 ******************************************************************************/
236
237acpi_status
238acpi_tb_init_table_descriptor (
239	acpi_table_type                 table_type,
240	struct acpi_table_desc          *table_info)
241{
242	struct acpi_table_list          *list_head;
243	struct acpi_table_desc          *table_desc;
244
245
246	ACPI_FUNCTION_TRACE_U32 ("tb_init_table_descriptor", table_type);
247
248
249	/* Allocate a descriptor for this table */
250
251	table_desc = ACPI_MEM_CALLOCATE (sizeof (struct acpi_table_desc));
252	if (!table_desc) {
253		return_ACPI_STATUS (AE_NO_MEMORY);
254	}
255
256	/*
257	 * Install the table into the global data structure
258	 */
259	list_head = &acpi_gbl_table_lists[table_type];
260
261	/*
262	 * Two major types of tables:  1) Only one instance is allowed.  This
263	 * includes most ACPI tables such as the DSDT.  2) Multiple instances of
264	 * the table are allowed.  This includes SSDT and PSDTs.
265	 */
266	if (ACPI_IS_SINGLE_TABLE (acpi_gbl_table_data[table_type].flags)) {
267		/*
268		 * Only one table allowed, and a table has alread been installed
269		 * at this location, so return an error.
270		 */
271		if (list_head->next) {
272			ACPI_MEM_FREE (table_desc);
273			return_ACPI_STATUS (AE_ALREADY_EXISTS);
274		}
275
276		table_desc->next = list_head->next;
277		list_head->next = table_desc;
278
279		if (table_desc->next) {
280			table_desc->next->prev = table_desc;
281		}
282
283		list_head->count++;
284	}
285	else {
286		/*
287		 * Link the new table in to the list of tables of this type.
288		 * Insert at the end of the list, order IS IMPORTANT.
289		 *
290		 * table_desc->Prev & Next are already NULL from calloc()
291		 */
292		list_head->count++;
293
294		if (!list_head->next) {
295			list_head->next = table_desc;
296		}
297		else {
298			table_desc->next = list_head->next;
299
300			while (table_desc->next->next) {
301				table_desc->next = table_desc->next->next;
302			}
303
304			table_desc->next->next = table_desc;
305			table_desc->prev = table_desc->next;
306			table_desc->next = NULL;
307		}
308	}
309
310	/* Finish initialization of the table descriptor */
311
312	table_desc->type                = (u8) table_type;
313	table_desc->pointer             = table_info->pointer;
314	table_desc->length              = table_info->length;
315	table_desc->allocation          = table_info->allocation;
316	table_desc->aml_start           = (u8 *) (table_desc->pointer + 1),
317	table_desc->aml_length          = (u32) (table_desc->length -
318			 (u32) sizeof (struct acpi_table_header));
319	table_desc->table_id            = acpi_ut_allocate_owner_id (ACPI_OWNER_TYPE_TABLE);
320	table_desc->loaded_into_namespace = FALSE;
321
322	/*
323	 * Set the appropriate global pointer (if there is one) to point to the
324	 * newly installed table
325	 */
326	if (acpi_gbl_table_data[table_type].global_ptr) {
327		*(acpi_gbl_table_data[table_type].global_ptr) = table_info->pointer;
328	}
329
330	/* Return Data */
331
332	table_info->table_id        = table_desc->table_id;
333	table_info->installed_desc  = table_desc;
334
335	return_ACPI_STATUS (AE_OK);
336}
337
338
339/*******************************************************************************
340 *
341 * FUNCTION:    acpi_tb_delete_all_tables
342 *
343 * PARAMETERS:  None.
344 *
345 * RETURN:      None.
346 *
347 * DESCRIPTION: Delete all internal ACPI tables
348 *
349 ******************************************************************************/
350
351void
352acpi_tb_delete_all_tables (void)
353{
354	acpi_table_type                 type;
355
356
357	/*
358	 * Free memory allocated for ACPI tables
359	 * Memory can either be mapped or allocated
360	 */
361	for (type = 0; type < NUM_ACPI_TABLE_TYPES; type++) {
362		acpi_tb_delete_tables_by_type (type);
363	}
364}
365
366
367/*******************************************************************************
368 *
369 * FUNCTION:    acpi_tb_delete_tables_by_type
370 *
371 * PARAMETERS:  Type                - The table type to be deleted
372 *
373 * RETURN:      None.
374 *
375 * DESCRIPTION: Delete an internal ACPI table
376 *              Locks the ACPI table mutex
377 *
378 ******************************************************************************/
379
380void
381acpi_tb_delete_tables_by_type (
382	acpi_table_type                 type)
383{
384	struct acpi_table_desc          *table_desc;
385	u32                             count;
386	u32                             i;
387
388
389	ACPI_FUNCTION_TRACE_U32 ("tb_delete_tables_by_type", type);
390
391
392	if (type > ACPI_TABLE_MAX) {
393		return_VOID;
394	}
395
396	if (ACPI_FAILURE (acpi_ut_acquire_mutex (ACPI_MTX_TABLES))) {
397		return;
398	}
399
400	/* Clear the appropriate "typed" global table pointer */
401
402	switch (type) {
403	case ACPI_TABLE_RSDP:
404		acpi_gbl_RSDP = NULL;
405		break;
406
407	case ACPI_TABLE_DSDT:
408		acpi_gbl_DSDT = NULL;
409		break;
410
411	case ACPI_TABLE_FADT:
412		acpi_gbl_FADT = NULL;
413		break;
414
415	case ACPI_TABLE_FACS:
416		acpi_gbl_FACS = NULL;
417		break;
418
419	case ACPI_TABLE_XSDT:
420		acpi_gbl_XSDT = NULL;
421		break;
422
423	case ACPI_TABLE_SSDT:
424	case ACPI_TABLE_PSDT:
425	default:
426		break;
427	}
428
429	/*
430	 * Free the table
431	 * 1) Get the head of the list
432	 */
433	table_desc = acpi_gbl_table_lists[type].next;
434	count     = acpi_gbl_table_lists[type].count;
435
436	/*
437	 * 2) Walk the entire list, deleting both the allocated tables
438	 *    and the table descriptors
439	 */
440	for (i = 0; i < count; i++) {
441		table_desc = acpi_tb_uninstall_table (table_desc);
442	}
443
444	(void) acpi_ut_release_mutex (ACPI_MTX_TABLES);
445	return_VOID;
446}
447
448
449/*******************************************************************************
450 *
451 * FUNCTION:    acpi_tb_delete_single_table
452 *
453 * PARAMETERS:  table_info          - A table info struct
454 *
455 * RETURN:      None.
456 *
457 * DESCRIPTION: Low-level free for a single ACPI table.  Handles cases where
458 *              the table was allocated a buffer or was mapped.
459 *
460 ******************************************************************************/
461
462void
463acpi_tb_delete_single_table (
464	struct acpi_table_desc          *table_desc)
465{
466
467	/* Must have a valid table descriptor and pointer */
468
469	if ((!table_desc) ||
470		 (!table_desc->pointer)) {
471		return;
472	}
473
474	/* Valid table, determine type of memory allocation */
475
476	switch (table_desc->allocation) {
477	case ACPI_MEM_NOT_ALLOCATED:
478		break;
479
480	case ACPI_MEM_ALLOCATED:
481
482		ACPI_MEM_FREE (table_desc->pointer);
483		break;
484
485	case ACPI_MEM_MAPPED:
486
487		acpi_os_unmap_memory (table_desc->pointer, table_desc->length);
488		break;
489
490	default:
491		break;
492	}
493}
494
495
496/*******************************************************************************
497 *
498 * FUNCTION:    acpi_tb_uninstall_table
499 *
500 * PARAMETERS:  table_info          - A table info struct
501 *
502 * RETURN:      Pointer to the next table in the list (of same type)
503 *
504 * DESCRIPTION: Free the memory associated with an internal ACPI table that
505 *              is either installed or has never been installed.
506 *              Table mutex should be locked.
507 *
508 ******************************************************************************/
509
510struct acpi_table_desc *
511acpi_tb_uninstall_table (
512	struct acpi_table_desc          *table_desc)
513{
514	struct acpi_table_desc          *next_desc;
515
516
517	ACPI_FUNCTION_TRACE_PTR ("tb_uninstall_table", table_desc);
518
519
520	if (!table_desc) {
521		return_PTR (NULL);
522	}
523
524	/* Unlink the descriptor from the doubly linked list */
525
526	if (table_desc->prev) {
527		table_desc->prev->next = table_desc->next;
528	}
529	else {
530		/* Is first on list, update list head */
531
532		acpi_gbl_table_lists[table_desc->type].next = table_desc->next;
533	}
534
535	if (table_desc->next) {
536		table_desc->next->prev = table_desc->prev;
537	}
538
539	/* Free the memory allocated for the table itself */
540
541	acpi_tb_delete_single_table (table_desc);
542
543	/* Free the table descriptor */
544
545	next_desc = table_desc->next;
546	ACPI_MEM_FREE (table_desc);
547
548	/* Return pointer to the next descriptor */
549
550	return_PTR (next_desc);
551}
552
553