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[linux-2.6.git] / drivers / acpi / executer / excreate.c
1 /******************************************************************************
2  *
3  * Module Name: excreate - Named object creation
4  *
5  *****************************************************************************/
6
7 /*
8  * Copyright (C) 2000 - 2007, 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/acinterp.h>
46 #include <acpi/amlcode.h>
47 #include <acpi/acnamesp.h>
48 #include <acpi/acevents.h>
49 #include <acpi/actables.h>
50
51 #define _COMPONENT          ACPI_EXECUTER
52 ACPI_MODULE_NAME("excreate")
53
54 #ifndef ACPI_NO_METHOD_EXECUTION
55 /*******************************************************************************
56  *
57  * FUNCTION:    acpi_ex_create_alias
58  *
59  * PARAMETERS:  walk_state           - Current state, contains operands
60  *
61  * RETURN:      Status
62  *
63  * DESCRIPTION: Create a new named alias
64  *
65  ******************************************************************************/
66 acpi_status acpi_ex_create_alias(struct acpi_walk_state *walk_state)
67 {
68         struct acpi_namespace_node *target_node;
69         struct acpi_namespace_node *alias_node;
70         acpi_status status = AE_OK;
71
72         ACPI_FUNCTION_TRACE(ex_create_alias);
73
74         /* Get the source/alias operands (both namespace nodes) */
75
76         alias_node = (struct acpi_namespace_node *)walk_state->operands[0];
77         target_node = (struct acpi_namespace_node *)walk_state->operands[1];
78
79         if ((target_node->type == ACPI_TYPE_LOCAL_ALIAS) ||
80             (target_node->type == ACPI_TYPE_LOCAL_METHOD_ALIAS)) {
81                 /*
82                  * Dereference an existing alias so that we don't create a chain
83                  * of aliases.  With this code, we guarantee that an alias is
84                  * always exactly one level of indirection away from the
85                  * actual aliased name.
86                  */
87                 target_node =
88                     ACPI_CAST_PTR(struct acpi_namespace_node,
89                                   target_node->object);
90         }
91
92         /*
93          * For objects that can never change (i.e., the NS node will
94          * permanently point to the same object), we can simply attach
95          * the object to the new NS node.  For other objects (such as
96          * Integers, buffers, etc.), we have to point the Alias node
97          * to the original Node.
98          */
99         switch (target_node->type) {
100         case ACPI_TYPE_INTEGER:
101         case ACPI_TYPE_STRING:
102         case ACPI_TYPE_BUFFER:
103         case ACPI_TYPE_PACKAGE:
104         case ACPI_TYPE_BUFFER_FIELD:
105
106                 /*
107                  * The new alias has the type ALIAS and points to the original
108                  * NS node, not the object itself.  This is because for these
109                  * types, the object can change dynamically via a Store.
110                  */
111                 alias_node->type = ACPI_TYPE_LOCAL_ALIAS;
112                 alias_node->object =
113                     ACPI_CAST_PTR(union acpi_operand_object, target_node);
114                 break;
115
116         case ACPI_TYPE_METHOD:
117
118                 /*
119                  * The new alias has the type ALIAS and points to the original
120                  * NS node, not the object itself.  This is because for these
121                  * types, the object can change dynamically via a Store.
122                  */
123                 alias_node->type = ACPI_TYPE_LOCAL_METHOD_ALIAS;
124                 alias_node->object =
125                     ACPI_CAST_PTR(union acpi_operand_object, target_node);
126                 break;
127
128         default:
129
130                 /* Attach the original source object to the new Alias Node */
131
132                 /*
133                  * The new alias assumes the type of the target, and it points
134                  * to the same object.  The reference count of the object has an
135                  * additional reference to prevent deletion out from under either the
136                  * target node or the alias Node
137                  */
138                 status = acpi_ns_attach_object(alias_node,
139                                                acpi_ns_get_attached_object
140                                                (target_node),
141                                                target_node->type);
142                 break;
143         }
144
145         /* Since both operands are Nodes, we don't need to delete them */
146
147         return_ACPI_STATUS(status);
148 }
149
150 /*******************************************************************************
151  *
152  * FUNCTION:    acpi_ex_create_event
153  *
154  * PARAMETERS:  walk_state          - Current state
155  *
156  * RETURN:      Status
157  *
158  * DESCRIPTION: Create a new event object
159  *
160  ******************************************************************************/
161
162 acpi_status acpi_ex_create_event(struct acpi_walk_state *walk_state)
163 {
164         acpi_status status;
165         union acpi_operand_object *obj_desc;
166
167         ACPI_FUNCTION_TRACE(ex_create_event);
168
169         obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_EVENT);
170         if (!obj_desc) {
171                 status = AE_NO_MEMORY;
172                 goto cleanup;
173         }
174
175         /*
176          * Create the actual OS semaphore, with zero initial units -- meaning
177          * that the event is created in an unsignalled state
178          */
179         status = acpi_os_create_semaphore(ACPI_NO_UNIT_LIMIT, 0,
180                                           &obj_desc->event.os_semaphore);
181         if (ACPI_FAILURE(status)) {
182                 goto cleanup;
183         }
184
185         /* Attach object to the Node */
186
187         status =
188             acpi_ns_attach_object((struct acpi_namespace_node *)walk_state->
189                                   operands[0], obj_desc, ACPI_TYPE_EVENT);
190
191       cleanup:
192         /*
193          * Remove local reference to the object (on error, will cause deletion
194          * of both object and semaphore if present.)
195          */
196         acpi_ut_remove_reference(obj_desc);
197         return_ACPI_STATUS(status);
198 }
199
200 /*******************************************************************************
201  *
202  * FUNCTION:    acpi_ex_create_mutex
203  *
204  * PARAMETERS:  walk_state          - Current state
205  *
206  * RETURN:      Status
207  *
208  * DESCRIPTION: Create a new mutex object
209  *
210  *              Mutex (Name[0], sync_level[1])
211  *
212  ******************************************************************************/
213
214 acpi_status acpi_ex_create_mutex(struct acpi_walk_state *walk_state)
215 {
216         acpi_status status = AE_OK;
217         union acpi_operand_object *obj_desc;
218
219         ACPI_FUNCTION_TRACE_PTR(ex_create_mutex, ACPI_WALK_OPERANDS);
220
221         /* Create the new mutex object */
222
223         obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_MUTEX);
224         if (!obj_desc) {
225                 status = AE_NO_MEMORY;
226                 goto cleanup;
227         }
228
229         /* Create the actual OS Mutex */
230
231         status = acpi_os_create_mutex(&obj_desc->mutex.os_mutex);
232         if (ACPI_FAILURE(status)) {
233                 goto cleanup;
234         }
235
236         /* Init object and attach to NS node */
237
238         obj_desc->mutex.sync_level =
239             (u8) walk_state->operands[1]->integer.value;
240         obj_desc->mutex.node =
241             (struct acpi_namespace_node *)walk_state->operands[0];
242
243         status =
244             acpi_ns_attach_object(obj_desc->mutex.node, obj_desc,
245                                   ACPI_TYPE_MUTEX);
246
247       cleanup:
248         /*
249          * Remove local reference to the object (on error, will cause deletion
250          * of both object and semaphore if present.)
251          */
252         acpi_ut_remove_reference(obj_desc);
253         return_ACPI_STATUS(status);
254 }
255
256 /*******************************************************************************
257  *
258  * FUNCTION:    acpi_ex_create_region
259  *
260  * PARAMETERS:  aml_start           - Pointer to the region declaration AML
261  *              aml_length          - Max length of the declaration AML
262  *              region_space        - space_iD for the region
263  *              walk_state          - Current state
264  *
265  * RETURN:      Status
266  *
267  * DESCRIPTION: Create a new operation region object
268  *
269  ******************************************************************************/
270
271 acpi_status
272 acpi_ex_create_region(u8 * aml_start,
273                       u32 aml_length,
274                       u8 region_space, struct acpi_walk_state *walk_state)
275 {
276         acpi_status status;
277         union acpi_operand_object *obj_desc;
278         struct acpi_namespace_node *node;
279         union acpi_operand_object *region_obj2;
280
281         ACPI_FUNCTION_TRACE(ex_create_region);
282
283         /* Get the Namespace Node */
284
285         node = walk_state->op->common.node;
286
287         /*
288          * If the region object is already attached to this node,
289          * just return
290          */
291         if (acpi_ns_get_attached_object(node)) {
292                 return_ACPI_STATUS(AE_OK);
293         }
294
295         /*
296          * Space ID must be one of the predefined IDs, or in the user-defined
297          * range
298          */
299         if ((region_space >= ACPI_NUM_PREDEFINED_REGIONS) &&
300             (region_space < ACPI_USER_REGION_BEGIN)) {
301                 ACPI_ERROR((AE_INFO, "Invalid AddressSpace type %X",
302                             region_space));
303                 return_ACPI_STATUS(AE_AML_INVALID_SPACE_ID);
304         }
305
306         ACPI_DEBUG_PRINT((ACPI_DB_LOAD, "Region Type - %s (%X)\n",
307                           acpi_ut_get_region_name(region_space), region_space));
308
309         /* Create the region descriptor */
310
311         obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_REGION);
312         if (!obj_desc) {
313                 status = AE_NO_MEMORY;
314                 goto cleanup;
315         }
316
317         /*
318          * Remember location in AML stream of address & length
319          * operands since they need to be evaluated at run time.
320          */
321         region_obj2 = obj_desc->common.next_object;
322         region_obj2->extra.aml_start = aml_start;
323         region_obj2->extra.aml_length = aml_length;
324
325         /* Init the region from the operands */
326
327         obj_desc->region.space_id = region_space;
328         obj_desc->region.address = 0;
329         obj_desc->region.length = 0;
330         obj_desc->region.node = node;
331
332         /* Install the new region object in the parent Node */
333
334         status = acpi_ns_attach_object(node, obj_desc, ACPI_TYPE_REGION);
335
336       cleanup:
337
338         /* Remove local reference to the object */
339
340         acpi_ut_remove_reference(obj_desc);
341         return_ACPI_STATUS(status);
342 }
343
344 /*******************************************************************************
345  *
346  * FUNCTION:    acpi_ex_create_table_region
347  *
348  * PARAMETERS:  walk_state          - Current state
349  *
350  * RETURN:      Status
351  *
352  * DESCRIPTION: Create a new data_table_region object
353  *
354  ******************************************************************************/
355
356 acpi_status acpi_ex_create_table_region(struct acpi_walk_state *walk_state)
357 {
358         acpi_status status;
359         union acpi_operand_object **operand = &walk_state->operands[0];
360         union acpi_operand_object *obj_desc;
361         struct acpi_namespace_node *node;
362         union acpi_operand_object *region_obj2;
363         acpi_native_uint table_index;
364         struct acpi_table_header *table;
365
366         ACPI_FUNCTION_TRACE(ex_create_table_region);
367
368         /* Get the Node from the object stack  */
369
370         node = walk_state->op->common.node;
371
372         /*
373          * If the region object is already attached to this node,
374          * just return
375          */
376         if (acpi_ns_get_attached_object(node)) {
377                 return_ACPI_STATUS(AE_OK);
378         }
379
380         /* Find the ACPI table */
381
382         status = acpi_tb_find_table(operand[1]->string.pointer,
383                                     operand[2]->string.pointer,
384                                     operand[3]->string.pointer, &table_index);
385         if (ACPI_FAILURE(status)) {
386                 return_ACPI_STATUS(status);
387         }
388
389         /* Create the region descriptor */
390
391         obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_REGION);
392         if (!obj_desc) {
393                 return_ACPI_STATUS(AE_NO_MEMORY);
394         }
395
396         region_obj2 = obj_desc->common.next_object;
397         region_obj2->extra.region_context = NULL;
398
399         status = acpi_get_table_by_index(table_index, &table);
400         if (ACPI_FAILURE(status)) {
401                 return_ACPI_STATUS(status);
402         }
403
404         /* Init the region from the operands */
405
406         obj_desc->region.space_id = REGION_DATA_TABLE;
407         obj_desc->region.address =
408             (acpi_physical_address) ACPI_TO_INTEGER(table);
409         obj_desc->region.length = table->length;
410         obj_desc->region.node = node;
411         obj_desc->region.flags = AOPOBJ_DATA_VALID;
412
413         /* Install the new region object in the parent Node */
414
415         status = acpi_ns_attach_object(node, obj_desc, ACPI_TYPE_REGION);
416         if (ACPI_FAILURE(status)) {
417                 goto cleanup;
418         }
419
420         status = acpi_ev_initialize_region(obj_desc, FALSE);
421         if (ACPI_FAILURE(status)) {
422                 if (status == AE_NOT_EXIST) {
423                         status = AE_OK;
424                 } else {
425                         goto cleanup;
426                 }
427         }
428
429         obj_desc->region.flags |= AOPOBJ_SETUP_COMPLETE;
430
431       cleanup:
432
433         /* Remove local reference to the object */
434
435         acpi_ut_remove_reference(obj_desc);
436         return_ACPI_STATUS(status);
437 }
438
439 /*******************************************************************************
440  *
441  * FUNCTION:    acpi_ex_create_processor
442  *
443  * PARAMETERS:  walk_state          - Current state
444  *
445  * RETURN:      Status
446  *
447  * DESCRIPTION: Create a new processor object and populate the fields
448  *
449  *              Processor (Name[0], cpu_iD[1], pblock_addr[2], pblock_length[3])
450  *
451  ******************************************************************************/
452
453 acpi_status acpi_ex_create_processor(struct acpi_walk_state *walk_state)
454 {
455         union acpi_operand_object **operand = &walk_state->operands[0];
456         union acpi_operand_object *obj_desc;
457         acpi_status status;
458
459         ACPI_FUNCTION_TRACE_PTR(ex_create_processor, walk_state);
460
461         /* Create the processor object */
462
463         obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_PROCESSOR);
464         if (!obj_desc) {
465                 return_ACPI_STATUS(AE_NO_MEMORY);
466         }
467
468         /* Initialize the processor object from the operands */
469
470         obj_desc->processor.proc_id = (u8) operand[1]->integer.value;
471         obj_desc->processor.length = (u8) operand[3]->integer.value;
472         obj_desc->processor.address =
473             (acpi_io_address) operand[2]->integer.value;
474
475         /* Install the processor object in the parent Node */
476
477         status = acpi_ns_attach_object((struct acpi_namespace_node *)operand[0],
478                                        obj_desc, ACPI_TYPE_PROCESSOR);
479
480         /* Remove local reference to the object */
481
482         acpi_ut_remove_reference(obj_desc);
483         return_ACPI_STATUS(status);
484 }
485
486 /*******************************************************************************
487  *
488  * FUNCTION:    acpi_ex_create_power_resource
489  *
490  * PARAMETERS:  walk_state          - Current state
491  *
492  * RETURN:      Status
493  *
494  * DESCRIPTION: Create a new power_resource object and populate the fields
495  *
496  *              power_resource (Name[0], system_level[1], resource_order[2])
497  *
498  ******************************************************************************/
499
500 acpi_status acpi_ex_create_power_resource(struct acpi_walk_state *walk_state)
501 {
502         union acpi_operand_object **operand = &walk_state->operands[0];
503         acpi_status status;
504         union acpi_operand_object *obj_desc;
505
506         ACPI_FUNCTION_TRACE_PTR(ex_create_power_resource, walk_state);
507
508         /* Create the power resource object */
509
510         obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_POWER);
511         if (!obj_desc) {
512                 return_ACPI_STATUS(AE_NO_MEMORY);
513         }
514
515         /* Initialize the power object from the operands */
516
517         obj_desc->power_resource.system_level = (u8) operand[1]->integer.value;
518         obj_desc->power_resource.resource_order =
519             (u16) operand[2]->integer.value;
520
521         /* Install the  power resource object in the parent Node */
522
523         status = acpi_ns_attach_object((struct acpi_namespace_node *)operand[0],
524                                        obj_desc, ACPI_TYPE_POWER);
525
526         /* Remove local reference to the object */
527
528         acpi_ut_remove_reference(obj_desc);
529         return_ACPI_STATUS(status);
530 }
531 #endif
532
533 /*******************************************************************************
534  *
535  * FUNCTION:    acpi_ex_create_method
536  *
537  * PARAMETERS:  aml_start       - First byte of the method's AML
538  *              aml_length      - AML byte count for this method
539  *              walk_state      - Current state
540  *
541  * RETURN:      Status
542  *
543  * DESCRIPTION: Create a new method object
544  *
545  ******************************************************************************/
546
547 acpi_status
548 acpi_ex_create_method(u8 * aml_start,
549                       u32 aml_length, struct acpi_walk_state *walk_state)
550 {
551         union acpi_operand_object **operand = &walk_state->operands[0];
552         union acpi_operand_object *obj_desc;
553         acpi_status status;
554         u8 method_flags;
555
556         ACPI_FUNCTION_TRACE_PTR(ex_create_method, walk_state);
557
558         /* Create a new method object */
559
560         obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_METHOD);
561         if (!obj_desc) {
562                 status = AE_NO_MEMORY;
563                 goto exit;
564         }
565
566         /* Save the method's AML pointer and length  */
567
568         obj_desc->method.aml_start = aml_start;
569         obj_desc->method.aml_length = aml_length;
570
571         /*
572          * Disassemble the method flags. Split off the Arg Count
573          * for efficiency
574          */
575         method_flags = (u8) operand[1]->integer.value;
576
577         obj_desc->method.method_flags =
578             (u8) (method_flags & ~AML_METHOD_ARG_COUNT);
579         obj_desc->method.param_count =
580             (u8) (method_flags & AML_METHOD_ARG_COUNT);
581
582         /*
583          * Get the sync_level. If method is serialized, a mutex will be
584          * created for this method when it is parsed.
585          */
586         if (method_flags & AML_METHOD_SERIALIZED) {
587                 /*
588                  * ACPI 1.0: sync_level = 0
589                  * ACPI 2.0: sync_level = sync_level in method declaration
590                  */
591                 obj_desc->method.sync_level = (u8)
592                     ((method_flags & AML_METHOD_SYNCH_LEVEL) >> 4);
593         }
594
595         /* Attach the new object to the method Node */
596
597         status = acpi_ns_attach_object((struct acpi_namespace_node *)operand[0],
598                                        obj_desc, ACPI_TYPE_METHOD);
599
600         /* Remove local reference to the object */
601
602         acpi_ut_remove_reference(obj_desc);
603
604       exit:
605         /* Remove a reference to the operand */
606
607         acpi_ut_remove_reference(operand[1]);
608         return_ACPI_STATUS(status);
609 }