ACPI: ACPICA 20060421
[linux-2.6.git] / drivers / acpi / executer / exstore.c
1
2 /******************************************************************************
3  *
4  * Module Name: exstore - AML Interpreter object store support
5  *
6  *****************************************************************************/
7
8 /*
9  * Copyright (C) 2000 - 2006, R. Byron Moore
10  * All rights reserved.
11  *
12  * Redistribution and use in source and binary forms, with or without
13  * modification, are permitted provided that the following conditions
14  * are met:
15  * 1. Redistributions of source code must retain the above copyright
16  *    notice, this list of conditions, and the following disclaimer,
17  *    without modification.
18  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
19  *    substantially similar to the "NO WARRANTY" disclaimer below
20  *    ("Disclaimer") and any redistribution must be conditioned upon
21  *    including a substantially similar Disclaimer requirement for further
22  *    binary redistribution.
23  * 3. Neither the names of the above-listed copyright holders nor the names
24  *    of any contributors may be used to endorse or promote products derived
25  *    from this software without specific prior written permission.
26  *
27  * Alternatively, this software may be distributed under the terms of the
28  * GNU General Public License ("GPL") version 2 as published by the Free
29  * Software Foundation.
30  *
31  * NO WARRANTY
32  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
33  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
34  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
35  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
36  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
37  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
38  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
39  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
40  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
41  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
42  * POSSIBILITY OF SUCH DAMAGES.
43  */
44
45 #include <acpi/acpi.h>
46 #include <acpi/acdispat.h>
47 #include <acpi/acinterp.h>
48 #include <acpi/amlcode.h>
49 #include <acpi/acnamesp.h>
50 #include <acpi/acparser.h>
51
52 #define _COMPONENT          ACPI_EXECUTER
53 ACPI_MODULE_NAME("exstore")
54
55 /* Local prototypes */
56 static void
57 acpi_ex_do_debug_object(union acpi_operand_object *source_desc,
58                         u32 level, u32 index);
59
60 static acpi_status
61 acpi_ex_store_object_to_index(union acpi_operand_object *val_desc,
62                               union acpi_operand_object *dest_desc,
63                               struct acpi_walk_state *walk_state);
64
65 /*******************************************************************************
66  *
67  * FUNCTION:    acpi_ex_do_debug_object
68  *
69  * PARAMETERS:  source_desc         - Value to be stored
70  *              Level               - Indentation level (used for packages)
71  *              Index               - Current package element, zero if not pkg
72  *
73  * RETURN:      None
74  *
75  * DESCRIPTION: Handles stores to the Debug Object.
76  *
77  ******************************************************************************/
78
79 static void
80 acpi_ex_do_debug_object(union acpi_operand_object *source_desc,
81                         u32 level, u32 index)
82 {
83         u32 i;
84
85         ACPI_FUNCTION_TRACE_PTR(ex_do_debug_object, source_desc);
86
87         ACPI_DEBUG_PRINT_RAW((ACPI_DB_DEBUG_OBJECT, "[ACPI Debug] %*s",
88                               level, " "));
89
90         /* Display index for package output only */
91
92         if (index > 0) {
93                 ACPI_DEBUG_PRINT_RAW((ACPI_DB_DEBUG_OBJECT,
94                                       "(%.2u) ", index - 1));
95         }
96
97         if (!source_desc) {
98                 ACPI_DEBUG_PRINT_RAW((ACPI_DB_DEBUG_OBJECT, "<Null Object>\n"));
99                 return_VOID;
100         }
101
102         if (ACPI_GET_DESCRIPTOR_TYPE(source_desc) == ACPI_DESC_TYPE_OPERAND) {
103                 ACPI_DEBUG_PRINT_RAW((ACPI_DB_DEBUG_OBJECT, "%s: ",
104                                       acpi_ut_get_object_type_name
105                                       (source_desc)));
106
107                 if (!acpi_ut_valid_internal_object(source_desc)) {
108                         ACPI_DEBUG_PRINT_RAW((ACPI_DB_DEBUG_OBJECT,
109                                               "%p, Invalid Internal Object!\n",
110                                               source_desc));
111                         return_VOID;
112                 }
113         } else if (ACPI_GET_DESCRIPTOR_TYPE(source_desc) ==
114                    ACPI_DESC_TYPE_NAMED) {
115                 ACPI_DEBUG_PRINT_RAW((ACPI_DB_DEBUG_OBJECT, "%s: %p\n",
116                                       acpi_ut_get_type_name(((struct
117                                                               acpi_namespace_node
118                                                               *)source_desc)->
119                                                             type),
120                                       source_desc));
121                 return_VOID;
122         } else {
123                 return_VOID;
124         }
125
126         switch (ACPI_GET_OBJECT_TYPE(source_desc)) {
127         case ACPI_TYPE_INTEGER:
128
129                 /* Output correct integer width */
130
131                 if (acpi_gbl_integer_byte_width == 4) {
132                         ACPI_DEBUG_PRINT_RAW((ACPI_DB_DEBUG_OBJECT, "0x%8.8X\n",
133                                               (u32) source_desc->integer.
134                                               value));
135                 } else {
136                         ACPI_DEBUG_PRINT_RAW((ACPI_DB_DEBUG_OBJECT,
137                                               "0x%8.8X%8.8X\n",
138                                               ACPI_FORMAT_UINT64(source_desc->
139                                                                  integer.
140                                                                  value)));
141                 }
142                 break;
143
144         case ACPI_TYPE_BUFFER:
145
146                 ACPI_DEBUG_PRINT_RAW((ACPI_DB_DEBUG_OBJECT, "[0x%.2X]\n",
147                                       (u32) source_desc->buffer.length));
148                 ACPI_DUMP_BUFFER(source_desc->buffer.pointer,
149                                  (source_desc->buffer.length <
150                                   32) ? source_desc->buffer.length : 32);
151                 break;
152
153         case ACPI_TYPE_STRING:
154
155                 ACPI_DEBUG_PRINT_RAW((ACPI_DB_DEBUG_OBJECT, "[0x%.2X] \"%s\"\n",
156                                       source_desc->string.length,
157                                       source_desc->string.pointer));
158                 break;
159
160         case ACPI_TYPE_PACKAGE:
161
162                 ACPI_DEBUG_PRINT_RAW((ACPI_DB_DEBUG_OBJECT,
163                                       "[0x%.2X Elements]\n",
164                                       source_desc->package.count));
165
166                 /* Output the entire contents of the package */
167
168                 for (i = 0; i < source_desc->package.count; i++) {
169                         acpi_ex_do_debug_object(source_desc->package.
170                                                 elements[i], level + 4, i + 1);
171                 }
172                 break;
173
174         case ACPI_TYPE_LOCAL_REFERENCE:
175
176                 if (source_desc->reference.opcode == AML_INDEX_OP) {
177                         ACPI_DEBUG_PRINT_RAW((ACPI_DB_DEBUG_OBJECT,
178                                               "[%s, 0x%X]\n",
179                                               acpi_ps_get_opcode_name
180                                               (source_desc->reference.opcode),
181                                               source_desc->reference.offset));
182                 } else {
183                         ACPI_DEBUG_PRINT_RAW((ACPI_DB_DEBUG_OBJECT, "[%s]\n",
184                                               acpi_ps_get_opcode_name
185                                               (source_desc->reference.opcode)));
186                 }
187
188                 if (source_desc->reference.object) {
189                         if (ACPI_GET_DESCRIPTOR_TYPE
190                             (source_desc->reference.object) ==
191                             ACPI_DESC_TYPE_NAMED) {
192                                 acpi_ex_do_debug_object(((struct
193                                                           acpi_namespace_node *)
194                                                          source_desc->reference.
195                                                          object)->object,
196                                                         level + 4, 0);
197                         } else {
198                                 acpi_ex_do_debug_object(source_desc->reference.
199                                                         object, level + 4, 0);
200                         }
201                 } else if (source_desc->reference.node) {
202                         acpi_ex_do_debug_object((source_desc->reference.node)->
203                                                 object, level + 4, 0);
204                 }
205                 break;
206
207         default:
208
209                 ACPI_DEBUG_PRINT_RAW((ACPI_DB_DEBUG_OBJECT, "%p %s\n",
210                                       source_desc,
211                                       acpi_ut_get_object_type_name
212                                       (source_desc)));
213                 break;
214         }
215
216         ACPI_DEBUG_PRINT_RAW((ACPI_DB_EXEC, "\n"));
217         return_VOID;
218 }
219
220 /*******************************************************************************
221  *
222  * FUNCTION:    acpi_ex_store
223  *
224  * PARAMETERS:  *source_desc        - Value to be stored
225  *              *dest_desc          - Where to store it.  Must be an NS node
226  *                                    or an union acpi_operand_object of type
227  *                                    Reference;
228  *              walk_state          - Current walk state
229  *
230  * RETURN:      Status
231  *
232  * DESCRIPTION: Store the value described by source_desc into the location
233  *              described by dest_desc. Called by various interpreter
234  *              functions to store the result of an operation into
235  *              the destination operand -- not just simply the actual "Store"
236  *              ASL operator.
237  *
238  ******************************************************************************/
239
240 acpi_status
241 acpi_ex_store(union acpi_operand_object *source_desc,
242               union acpi_operand_object *dest_desc,
243               struct acpi_walk_state *walk_state)
244 {
245         acpi_status status = AE_OK;
246         union acpi_operand_object *ref_desc = dest_desc;
247
248         ACPI_FUNCTION_TRACE_PTR(ex_store, dest_desc);
249
250         /* Validate parameters */
251
252         if (!source_desc || !dest_desc) {
253                 ACPI_ERROR((AE_INFO, "Null parameter"));
254                 return_ACPI_STATUS(AE_AML_NO_OPERAND);
255         }
256
257         /* dest_desc can be either a namespace node or an ACPI object */
258
259         if (ACPI_GET_DESCRIPTOR_TYPE(dest_desc) == ACPI_DESC_TYPE_NAMED) {
260                 /*
261                  * Dest is a namespace node,
262                  * Storing an object into a Named node.
263                  */
264                 status = acpi_ex_store_object_to_node(source_desc,
265                                                       (struct
266                                                        acpi_namespace_node *)
267                                                       dest_desc, walk_state,
268                                                       ACPI_IMPLICIT_CONVERSION);
269
270                 return_ACPI_STATUS(status);
271         }
272
273         /* Destination object must be a Reference or a Constant object */
274
275         switch (ACPI_GET_OBJECT_TYPE(dest_desc)) {
276         case ACPI_TYPE_LOCAL_REFERENCE:
277                 break;
278
279         case ACPI_TYPE_INTEGER:
280
281                 /* Allow stores to Constants -- a Noop as per ACPI spec */
282
283                 if (dest_desc->common.flags & AOPOBJ_AML_CONSTANT) {
284                         return_ACPI_STATUS(AE_OK);
285                 }
286
287                 /*lint -fallthrough */
288
289         default:
290
291                 /* Destination is not a Reference object */
292
293                 ACPI_ERROR((AE_INFO,
294                             "Target is not a Reference or Constant object - %s [%p]",
295                             acpi_ut_get_object_type_name(dest_desc),
296                             dest_desc));
297
298                 ACPI_DUMP_STACK_ENTRY(source_desc);
299                 ACPI_DUMP_STACK_ENTRY(dest_desc);
300                 ACPI_DUMP_OPERANDS(&dest_desc, ACPI_IMODE_EXECUTE, "ExStore",
301                                    2,
302                                    "Target is not a Reference or Constant object");
303
304                 return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
305         }
306
307         /*
308          * Examine the Reference opcode.  These cases are handled:
309          *
310          * 1) Store to Name (Change the object associated with a name)
311          * 2) Store to an indexed area of a Buffer or Package
312          * 3) Store to a Method Local or Arg
313          * 4) Store to the debug object
314          */
315         switch (ref_desc->reference.opcode) {
316         case AML_NAME_OP:
317         case AML_REF_OF_OP:
318
319                 /* Storing an object into a Name "container" */
320
321                 status = acpi_ex_store_object_to_node(source_desc,
322                                                       ref_desc->reference.
323                                                       object, walk_state,
324                                                       ACPI_IMPLICIT_CONVERSION);
325                 break;
326
327         case AML_INDEX_OP:
328
329                 /* Storing to an Index (pointer into a packager or buffer) */
330
331                 status =
332                     acpi_ex_store_object_to_index(source_desc, ref_desc,
333                                                   walk_state);
334                 break;
335
336         case AML_LOCAL_OP:
337         case AML_ARG_OP:
338
339                 /* Store to a method local/arg  */
340
341                 status =
342                     acpi_ds_store_object_to_local(ref_desc->reference.opcode,
343                                                   ref_desc->reference.offset,
344                                                   source_desc, walk_state);
345                 break;
346
347         case AML_DEBUG_OP:
348
349                 /*
350                  * Storing to the Debug object causes the value stored to be
351                  * displayed and otherwise has no effect -- see ACPI Specification
352                  */
353                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
354                                   "**** Write to Debug Object: Object %p %s ****:\n\n",
355                                   source_desc,
356                                   acpi_ut_get_object_type_name(source_desc)));
357
358                 acpi_ex_do_debug_object(source_desc, 0, 0);
359                 break;
360
361         default:
362
363                 ACPI_ERROR((AE_INFO, "Unknown Reference opcode %X",
364                             ref_desc->reference.opcode));
365                 ACPI_DUMP_ENTRY(ref_desc, ACPI_LV_ERROR);
366
367                 status = AE_AML_INTERNAL;
368                 break;
369         }
370
371         return_ACPI_STATUS(status);
372 }
373
374 /*******************************************************************************
375  *
376  * FUNCTION:    acpi_ex_store_object_to_index
377  *
378  * PARAMETERS:  *source_desc            - Value to be stored
379  *              *dest_desc              - Named object to receive the value
380  *              walk_state              - Current walk state
381  *
382  * RETURN:      Status
383  *
384  * DESCRIPTION: Store the object to indexed Buffer or Package element
385  *
386  ******************************************************************************/
387
388 static acpi_status
389 acpi_ex_store_object_to_index(union acpi_operand_object *source_desc,
390                               union acpi_operand_object *index_desc,
391                               struct acpi_walk_state *walk_state)
392 {
393         acpi_status status = AE_OK;
394         union acpi_operand_object *obj_desc;
395         union acpi_operand_object *new_desc;
396         u8 value = 0;
397         u32 i;
398
399         ACPI_FUNCTION_TRACE(ex_store_object_to_index);
400
401         /*
402          * Destination must be a reference pointer, and
403          * must point to either a buffer or a package
404          */
405         switch (index_desc->reference.target_type) {
406         case ACPI_TYPE_PACKAGE:
407                 /*
408                  * Storing to a package element. Copy the object and replace
409                  * any existing object with the new object. No implicit
410                  * conversion is performed.
411                  *
412                  * The object at *(index_desc->Reference.Where) is the
413                  * element within the package that is to be modified.
414                  * The parent package object is at index_desc->Reference.Object
415                  */
416                 obj_desc = *(index_desc->reference.where);
417
418                 status =
419                     acpi_ut_copy_iobject_to_iobject(source_desc, &new_desc,
420                                                     walk_state);
421                 if (ACPI_FAILURE(status)) {
422                         return_ACPI_STATUS(status);
423                 }
424
425                 if (obj_desc) {
426
427                         /* Decrement reference count by the ref count of the parent package */
428
429                         for (i = 0; i < ((union acpi_operand_object *)
430                                          index_desc->reference.object)->common.
431                              reference_count; i++) {
432                                 acpi_ut_remove_reference(obj_desc);
433                         }
434                 }
435
436                 *(index_desc->reference.where) = new_desc;
437
438                 /* Increment ref count by the ref count of the parent package-1 */
439
440                 for (i = 1; i < ((union acpi_operand_object *)
441                                  index_desc->reference.object)->common.
442                      reference_count; i++) {
443                         acpi_ut_add_reference(new_desc);
444                 }
445
446                 break;
447
448         case ACPI_TYPE_BUFFER_FIELD:
449
450                 /*
451                  * Store into a Buffer or String (not actually a real buffer_field)
452                  * at a location defined by an Index.
453                  *
454                  * The first 8-bit element of the source object is written to the
455                  * 8-bit Buffer location defined by the Index destination object,
456                  * according to the ACPI 2.0 specification.
457                  */
458
459                 /*
460                  * Make sure the target is a Buffer or String. An error should
461                  * not happen here, since the reference_object was constructed
462                  * by the INDEX_OP code.
463                  */
464                 obj_desc = index_desc->reference.object;
465                 if ((ACPI_GET_OBJECT_TYPE(obj_desc) != ACPI_TYPE_BUFFER) &&
466                     (ACPI_GET_OBJECT_TYPE(obj_desc) != ACPI_TYPE_STRING)) {
467                         return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
468                 }
469
470                 /*
471                  * The assignment of the individual elements will be slightly
472                  * different for each source type.
473                  */
474                 switch (ACPI_GET_OBJECT_TYPE(source_desc)) {
475                 case ACPI_TYPE_INTEGER:
476
477                         /* Use the least-significant byte of the integer */
478
479                         value = (u8) (source_desc->integer.value);
480                         break;
481
482                 case ACPI_TYPE_BUFFER:
483                 case ACPI_TYPE_STRING:
484
485                         /* Note: Takes advantage of common string/buffer fields */
486
487                         value = source_desc->buffer.pointer[0];
488                         break;
489
490                 default:
491
492                         /* All other types are invalid */
493
494                         ACPI_ERROR((AE_INFO,
495                                     "Source must be Integer/Buffer/String type, not %s",
496                                     acpi_ut_get_object_type_name(source_desc)));
497                         return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
498                 }
499
500                 /* Store the source value into the target buffer byte */
501
502                 obj_desc->buffer.pointer[index_desc->reference.offset] = value;
503                 break;
504
505         default:
506                 ACPI_ERROR((AE_INFO, "Target is not a Package or BufferField"));
507                 status = AE_AML_OPERAND_TYPE;
508                 break;
509         }
510
511         return_ACPI_STATUS(status);
512 }
513
514 /*******************************************************************************
515  *
516  * FUNCTION:    acpi_ex_store_object_to_node
517  *
518  * PARAMETERS:  source_desc             - Value to be stored
519  *              Node                    - Named object to receive the value
520  *              walk_state              - Current walk state
521  *              implicit_conversion     - Perform implicit conversion (yes/no)
522  *
523  * RETURN:      Status
524  *
525  * DESCRIPTION: Store the object to the named object.
526  *
527  *              The Assignment of an object to a named object is handled here
528  *              The value passed in will replace the current value (if any)
529  *              with the input value.
530  *
531  *              When storing into an object the data is converted to the
532  *              target object type then stored in the object.  This means
533  *              that the target object type (for an initialized target) will
534  *              not be changed by a store operation.
535  *
536  *              Assumes parameters are already validated.
537  *
538  ******************************************************************************/
539
540 acpi_status
541 acpi_ex_store_object_to_node(union acpi_operand_object *source_desc,
542                              struct acpi_namespace_node *node,
543                              struct acpi_walk_state *walk_state,
544                              u8 implicit_conversion)
545 {
546         acpi_status status = AE_OK;
547         union acpi_operand_object *target_desc;
548         union acpi_operand_object *new_desc;
549         acpi_object_type target_type;
550
551         ACPI_FUNCTION_TRACE_PTR(ex_store_object_to_node, source_desc);
552
553         /* Get current type of the node, and object attached to Node */
554
555         target_type = acpi_ns_get_type(node);
556         target_desc = acpi_ns_get_attached_object(node);
557
558         ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Storing %p(%s) into node %p(%s)\n",
559                           source_desc,
560                           acpi_ut_get_object_type_name(source_desc), node,
561                           acpi_ut_get_type_name(target_type)));
562
563         /*
564          * Resolve the source object to an actual value
565          * (If it is a reference object)
566          */
567         status = acpi_ex_resolve_object(&source_desc, target_type, walk_state);
568         if (ACPI_FAILURE(status)) {
569                 return_ACPI_STATUS(status);
570         }
571
572         /* If no implicit conversion, drop into the default case below */
573
574         if ((!implicit_conversion) || (walk_state->opcode == AML_COPY_OP)) {
575
576                 /* Force execution of default (no implicit conversion) */
577
578                 target_type = ACPI_TYPE_ANY;
579         }
580
581         /* Do the actual store operation */
582
583         switch (target_type) {
584         case ACPI_TYPE_BUFFER_FIELD:
585         case ACPI_TYPE_LOCAL_REGION_FIELD:
586         case ACPI_TYPE_LOCAL_BANK_FIELD:
587         case ACPI_TYPE_LOCAL_INDEX_FIELD:
588
589                 /* For fields, copy the source data to the target field. */
590
591                 status = acpi_ex_write_data_to_field(source_desc, target_desc,
592                                                      &walk_state->result_obj);
593                 break;
594
595         case ACPI_TYPE_INTEGER:
596         case ACPI_TYPE_STRING:
597         case ACPI_TYPE_BUFFER:
598
599                 /*
600                  * These target types are all of type Integer/String/Buffer, and
601                  * therefore support implicit conversion before the store.
602                  *
603                  * Copy and/or convert the source object to a new target object
604                  */
605                 status =
606                     acpi_ex_store_object_to_object(source_desc, target_desc,
607                                                    &new_desc, walk_state);
608                 if (ACPI_FAILURE(status)) {
609                         return_ACPI_STATUS(status);
610                 }
611
612                 if (new_desc != target_desc) {
613                         /*
614                          * Store the new new_desc as the new value of the Name, and set
615                          * the Name's type to that of the value being stored in it.
616                          * source_desc reference count is incremented by attach_object.
617                          *
618                          * Note: This may change the type of the node if an explicit store
619                          * has been performed such that the node/object type has been
620                          * changed.
621                          */
622                         status =
623                             acpi_ns_attach_object(node, new_desc,
624                                                   new_desc->common.type);
625
626                         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
627                                           "Store %s into %s via Convert/Attach\n",
628                                           acpi_ut_get_object_type_name
629                                           (source_desc),
630                                           acpi_ut_get_object_type_name
631                                           (new_desc)));
632                 }
633                 break;
634
635         default:
636
637                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
638                                   "Storing %s (%p) directly into node (%p) with no implicit conversion\n",
639                                   acpi_ut_get_object_type_name(source_desc),
640                                   source_desc, node));
641
642                 /* No conversions for all other types.  Just attach the source object */
643
644                 status = acpi_ns_attach_object(node, source_desc,
645                                                ACPI_GET_OBJECT_TYPE
646                                                (source_desc));
647                 break;
648         }
649
650         return_ACPI_STATUS(status);
651 }