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[linux-2.6] / drivers / acpi / tables / tbinstal.c
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 #include <acpi/acpi.h>
45 #include <acpi/actables.h>
46
47 #define _COMPONENT          ACPI_TABLES
48 ACPI_MODULE_NAME("tbinstal")
49
50 /* Local prototypes */
51 static acpi_status
52 acpi_tb_match_signature(char *signature,
53                         struct acpi_table_desc *table_info, u8 search_type);
54
55 /*******************************************************************************
56  *
57  * FUNCTION:    acpi_tb_match_signature
58  *
59  * PARAMETERS:  Signature           - Table signature to match
60  *              table_info          - Return data
61  *              search_type         - Table type to match (primary/secondary)
62  *
63  * RETURN:      Status
64  *
65  * DESCRIPTION: Compare signature against the list of "ACPI-subsystem-owned"
66  *              tables (DSDT/FADT/SSDT, etc.) Returns the table_type_iD on match.
67  *
68  ******************************************************************************/
69
70 static acpi_status
71 acpi_tb_match_signature(char *signature,
72                         struct acpi_table_desc *table_info, u8 search_type)
73 {
74         acpi_native_uint i;
75
76         ACPI_FUNCTION_TRACE("tb_match_signature");
77
78         /* Search for a signature match among the known table types */
79
80         for (i = 0; i < NUM_ACPI_TABLE_TYPES; i++) {
81                 if (!(acpi_gbl_table_data[i].flags & search_type)) {
82                         continue;
83                 }
84
85                 if (!ACPI_STRNCMP(signature, acpi_gbl_table_data[i].signature,
86                                   acpi_gbl_table_data[i].sig_length)) {
87                         /* Found a signature match, return index if requested */
88
89                         if (table_info) {
90                                 table_info->type = (u8) i;
91                         }
92
93                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
94                                           "Table [%4.4s] is an ACPI table consumed by the core subsystem\n",
95                                           (char *)acpi_gbl_table_data[i].
96                                           signature));
97
98                         return_ACPI_STATUS(AE_OK);
99                 }
100         }
101
102         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
103                           "Table [%4.4s] is not an ACPI table consumed by the core subsystem - ignored\n",
104                           (char *)signature));
105
106         return_ACPI_STATUS(AE_TABLE_NOT_SUPPORTED);
107 }
108
109 /*******************************************************************************
110  *
111  * FUNCTION:    acpi_tb_install_table
112  *
113  * PARAMETERS:  table_info          - Return value from acpi_tb_get_table_body
114  *
115  * RETURN:      Status
116  *
117  * DESCRIPTION: Install the table into the global data structures.
118  *
119  ******************************************************************************/
120
121 acpi_status acpi_tb_install_table(struct acpi_table_desc *table_info)
122 {
123         acpi_status status;
124
125         ACPI_FUNCTION_TRACE("tb_install_table");
126
127         /* Lock tables while installing */
128
129         status = acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
130         if (ACPI_FAILURE(status)) {
131                 ACPI_REPORT_ERROR(("Could not acquire table mutex, %s\n",
132                                    acpi_format_exception(status)));
133                 return_ACPI_STATUS(status);
134         }
135
136         /*
137          * Ignore a table that is already installed. For example, some BIOS
138          * ASL code will repeatedly attempt to load the same SSDT.
139          */
140         status = acpi_tb_is_table_installed(table_info);
141         if (ACPI_FAILURE(status)) {
142                 goto unlock_and_exit;
143         }
144
145         /* Install the table into the global data structure */
146
147         status = acpi_tb_init_table_descriptor(table_info->type, table_info);
148         if (ACPI_FAILURE(status)) {
149                 ACPI_REPORT_ERROR(("Could not install table [%4.4s], %s\n",
150                                    table_info->pointer->signature,
151                                    acpi_format_exception(status)));
152         }
153
154         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "%s located at %p\n",
155                           acpi_gbl_table_data[table_info->type].name,
156                           table_info->pointer));
157
158       unlock_and_exit:
159         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
160         return_ACPI_STATUS(status);
161 }
162
163 /*******************************************************************************
164  *
165  * FUNCTION:    acpi_tb_recognize_table
166  *
167  * PARAMETERS:  table_info          - Return value from acpi_tb_get_table_body
168  *              search_type         - Table type to match (primary/secondary)
169  *
170  * RETURN:      Status
171  *
172  * DESCRIPTION: Check a table signature for a match against known table types
173  *
174  * NOTE:  All table pointers are validated as follows:
175  *          1) Table pointer must point to valid physical memory
176  *          2) Signature must be 4 ASCII chars, even if we don't recognize the
177  *             name
178  *          3) Table must be readable for length specified in the header
179  *          4) Table checksum must be valid (with the exception of the FACS
180  *             which has no checksum for some odd reason)
181  *
182  ******************************************************************************/
183
184 acpi_status
185 acpi_tb_recognize_table(struct acpi_table_desc *table_info, u8 search_type)
186 {
187         struct acpi_table_header *table_header;
188         acpi_status status;
189
190         ACPI_FUNCTION_TRACE("tb_recognize_table");
191
192         /* Ensure that we have a valid table pointer */
193
194         table_header = (struct acpi_table_header *)table_info->pointer;
195         if (!table_header) {
196                 return_ACPI_STATUS(AE_BAD_PARAMETER);
197         }
198
199         /*
200          * We only "recognize" a limited number of ACPI tables -- namely, the
201          * ones that are used by the subsystem (DSDT, FADT, etc.)
202          *
203          * An AE_TABLE_NOT_SUPPORTED means that the table was not recognized.
204          * This can be any one of many valid ACPI tables, it just isn't one of
205          * the tables that is consumed by the core subsystem
206          */
207         status = acpi_tb_match_signature(table_header->signature,
208                                          table_info, search_type);
209         if (ACPI_FAILURE(status)) {
210                 return_ACPI_STATUS(status);
211         }
212
213         status = acpi_tb_validate_table_header(table_header);
214         if (ACPI_FAILURE(status)) {
215                 return_ACPI_STATUS(status);
216         }
217
218         /* Return the table type and length via the info struct */
219
220         table_info->length = (acpi_size) table_header->length;
221
222         return_ACPI_STATUS(status);
223 }
224
225 /*******************************************************************************
226  *
227  * FUNCTION:    acpi_tb_init_table_descriptor
228  *
229  * PARAMETERS:  table_type          - The type of the table
230  *              table_info          - A table info struct
231  *
232  * RETURN:      None.
233  *
234  * DESCRIPTION: Install a table into the global data structs.
235  *
236  ******************************************************************************/
237
238 acpi_status
239 acpi_tb_init_table_descriptor(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         acpi_status status;
245
246         ACPI_FUNCTION_TRACE_U32("tb_init_table_descriptor", table_type);
247
248         /* Allocate a descriptor for this table */
249
250         table_desc = ACPI_MEM_CALLOCATE(sizeof(struct acpi_table_desc));
251         if (!table_desc) {
252                 return_ACPI_STATUS(AE_NO_MEMORY);
253         }
254
255         /* Get a new owner ID for the table */
256
257         status = acpi_ut_allocate_owner_id(&table_desc->owner_id);
258         if (ACPI_FAILURE(status)) {
259                 return_ACPI_STATUS(status);
260         }
261
262         /* Install the table into the global data structure */
263
264         list_head = &acpi_gbl_table_lists[table_type];
265
266         /*
267          * Two major types of tables:  1) Only one instance is allowed.  This
268          * includes most ACPI tables such as the DSDT.  2) Multiple instances of
269          * the table are allowed.  This includes SSDT and PSDTs.
270          */
271         if (ACPI_IS_SINGLE_TABLE(acpi_gbl_table_data[table_type].flags)) {
272                 /*
273                  * Only one table allowed, and a table has alread been installed
274                  * at this location, so return an error.
275                  */
276                 if (list_head->next) {
277                         ACPI_MEM_FREE(table_desc);
278                         return_ACPI_STATUS(AE_ALREADY_EXISTS);
279                 }
280
281                 table_desc->next = list_head->next;
282                 list_head->next = table_desc;
283
284                 if (table_desc->next) {
285                         table_desc->next->prev = table_desc;
286                 }
287
288                 list_head->count++;
289         } else {
290                 /*
291                  * Link the new table in to the list of tables of this type.
292                  * Insert at the end of the list, order IS IMPORTANT.
293                  *
294                  * table_desc->Prev & Next are already NULL from calloc()
295                  */
296                 list_head->count++;
297
298                 if (!list_head->next) {
299                         list_head->next = table_desc;
300                 } else {
301                         table_desc->next = list_head->next;
302
303                         while (table_desc->next->next) {
304                                 table_desc->next = table_desc->next->next;
305                         }
306
307                         table_desc->next->next = table_desc;
308                         table_desc->prev = table_desc->next;
309                         table_desc->next = NULL;
310                 }
311         }
312
313         /* Finish initialization of the table descriptor */
314
315         table_desc->type = (u8) table_type;
316         table_desc->pointer = table_info->pointer;
317         table_desc->length = table_info->length;
318         table_desc->allocation = table_info->allocation;
319         table_desc->aml_start = (u8 *) (table_desc->pointer + 1),
320             table_desc->aml_length = (u32) (table_desc->length -
321                                             (u32) sizeof(struct
322                                                          acpi_table_header));
323         table_desc->loaded_into_namespace = FALSE;
324
325         /*
326          * Set the appropriate global pointer (if there is one) to point to the
327          * newly installed table
328          */
329         if (acpi_gbl_table_data[table_type].global_ptr) {
330                 *(acpi_gbl_table_data[table_type].global_ptr) =
331                     table_info->pointer;
332         }
333
334         /* Return Data */
335
336         table_info->owner_id = table_desc->owner_id;
337         table_info->installed_desc = table_desc;
338
339         return_ACPI_STATUS(AE_OK);
340 }
341
342 /*******************************************************************************
343  *
344  * FUNCTION:    acpi_tb_delete_all_tables
345  *
346  * PARAMETERS:  None.
347  *
348  * RETURN:      None.
349  *
350  * DESCRIPTION: Delete all internal ACPI tables
351  *
352  ******************************************************************************/
353
354 void acpi_tb_delete_all_tables(void)
355 {
356         acpi_table_type type;
357
358         /*
359          * Free memory allocated for ACPI tables
360          * Memory can either be mapped or allocated
361          */
362         for (type = 0; type < NUM_ACPI_TABLE_TYPES; type++) {
363                 acpi_tb_delete_tables_by_type(type);
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
380 void acpi_tb_delete_tables_by_type(acpi_table_type type)
381 {
382         struct acpi_table_desc *table_desc;
383         u32 count;
384         u32 i;
385
386         ACPI_FUNCTION_TRACE_U32("tb_delete_tables_by_type", type);
387
388         if (type > ACPI_TABLE_MAX) {
389                 return_VOID;
390         }
391
392         if (ACPI_FAILURE(acpi_ut_acquire_mutex(ACPI_MTX_TABLES))) {
393                 return;
394         }
395
396         /* Clear the appropriate "typed" global table pointer */
397
398         switch (type) {
399         case ACPI_TABLE_RSDP:
400                 acpi_gbl_RSDP = NULL;
401                 break;
402
403         case ACPI_TABLE_DSDT:
404                 acpi_gbl_DSDT = NULL;
405                 break;
406
407         case ACPI_TABLE_FADT:
408                 acpi_gbl_FADT = NULL;
409                 break;
410
411         case ACPI_TABLE_FACS:
412                 acpi_gbl_FACS = NULL;
413                 break;
414
415         case ACPI_TABLE_XSDT:
416                 acpi_gbl_XSDT = NULL;
417                 break;
418
419         case ACPI_TABLE_SSDT:
420         case ACPI_TABLE_PSDT:
421         default:
422                 break;
423         }
424
425         /*
426          * Free the table
427          * 1) Get the head of the list
428          */
429         table_desc = acpi_gbl_table_lists[type].next;
430         count = acpi_gbl_table_lists[type].count;
431
432         /*
433          * 2) Walk the entire list, deleting both the allocated tables
434          *    and the table descriptors
435          */
436         for (i = 0; i < count; i++) {
437                 table_desc = acpi_tb_uninstall_table(table_desc);
438         }
439
440         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
441         return_VOID;
442 }
443
444 /*******************************************************************************
445  *
446  * FUNCTION:    acpi_tb_delete_single_table
447  *
448  * PARAMETERS:  table_info          - A table info struct
449  *
450  * RETURN:      None.
451  *
452  * DESCRIPTION: Low-level free for a single ACPI table.  Handles cases where
453  *              the table was allocated a buffer or was mapped.
454  *
455  ******************************************************************************/
456
457 void acpi_tb_delete_single_table(struct acpi_table_desc *table_desc)
458 {
459
460         /* Must have a valid table descriptor and pointer */
461
462         if ((!table_desc) || (!table_desc->pointer)) {
463                 return;
464         }
465
466         /* Valid table, determine type of memory allocation */
467
468         switch (table_desc->allocation) {
469         case ACPI_MEM_NOT_ALLOCATED:
470                 break;
471
472         case ACPI_MEM_ALLOCATED:
473
474                 ACPI_MEM_FREE(table_desc->pointer);
475                 break;
476
477         case ACPI_MEM_MAPPED:
478
479                 acpi_os_unmap_memory(table_desc->pointer, table_desc->length);
480                 break;
481
482         default:
483                 break;
484         }
485 }
486
487 /*******************************************************************************
488  *
489  * FUNCTION:    acpi_tb_uninstall_table
490  *
491  * PARAMETERS:  table_info          - A table info struct
492  *
493  * RETURN:      Pointer to the next table in the list (of same type)
494  *
495  * DESCRIPTION: Free the memory associated with an internal ACPI table that
496  *              is either installed or has never been installed.
497  *              Table mutex should be locked.
498  *
499  ******************************************************************************/
500
501 struct acpi_table_desc *acpi_tb_uninstall_table(struct acpi_table_desc
502                                                 *table_desc)
503 {
504         struct acpi_table_desc *next_desc;
505
506         ACPI_FUNCTION_TRACE_PTR("tb_uninstall_table", table_desc);
507
508         if (!table_desc) {
509                 return_PTR(NULL);
510         }
511
512         /* Unlink the descriptor from the doubly linked list */
513
514         if (table_desc->prev) {
515                 table_desc->prev->next = table_desc->next;
516         } else {
517                 /* Is first on list, update list head */
518
519                 acpi_gbl_table_lists[table_desc->type].next = table_desc->next;
520         }
521
522         if (table_desc->next) {
523                 table_desc->next->prev = table_desc->prev;
524         }
525
526         /* Free the memory allocated for the table itself */
527
528         acpi_tb_delete_single_table(table_desc);
529
530         /* Free the table descriptor */
531
532         next_desc = table_desc->next;
533         ACPI_MEM_FREE(table_desc);
534
535         /* Return pointer to the next descriptor */
536
537         return_PTR(next_desc);
538 }