38b55e352495df4ed3808ffe713995dafe05e8db
[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 - 2008, Intel Corp.
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         /* Print line header as long as we are not in the middle of an object display */
88
89         if (!((level > 0) && index == 0)) {
90                 ACPI_DEBUG_PRINT_RAW((ACPI_DB_DEBUG_OBJECT, "[ACPI Debug] %*s",
91                                       level, " "));
92         }
93
94         /* Display index for package output only */
95
96         if (index > 0) {
97                 ACPI_DEBUG_PRINT_RAW((ACPI_DB_DEBUG_OBJECT,
98                                       "(%.2u) ", index - 1));
99         }
100
101         if (!source_desc) {
102                 ACPI_DEBUG_PRINT_RAW((ACPI_DB_DEBUG_OBJECT, "[Null Object]\n"));
103                 return_VOID;
104         }
105
106         if (ACPI_GET_DESCRIPTOR_TYPE(source_desc) == ACPI_DESC_TYPE_OPERAND) {
107                 ACPI_DEBUG_PRINT_RAW((ACPI_DB_DEBUG_OBJECT, "%s ",
108                                       acpi_ut_get_object_type_name
109                                       (source_desc)));
110
111                 if (!acpi_ut_valid_internal_object(source_desc)) {
112                         ACPI_DEBUG_PRINT_RAW((ACPI_DB_DEBUG_OBJECT,
113                                               "%p, Invalid Internal Object!\n",
114                                               source_desc));
115                         return_VOID;
116                 }
117         } else if (ACPI_GET_DESCRIPTOR_TYPE(source_desc) ==
118                    ACPI_DESC_TYPE_NAMED) {
119                 ACPI_DEBUG_PRINT_RAW((ACPI_DB_DEBUG_OBJECT, "%s: %p\n",
120                                       acpi_ut_get_type_name(((struct
121                                                               acpi_namespace_node
122                                                               *)source_desc)->
123                                                             type),
124                                       source_desc));
125                 return_VOID;
126         } else {
127                 return_VOID;
128         }
129
130         /* source_desc is of type ACPI_DESC_TYPE_OPERAND */
131
132         switch (ACPI_GET_OBJECT_TYPE(source_desc)) {
133         case ACPI_TYPE_INTEGER:
134
135                 /* Output correct integer width */
136
137                 if (acpi_gbl_integer_byte_width == 4) {
138                         ACPI_DEBUG_PRINT_RAW((ACPI_DB_DEBUG_OBJECT, "0x%8.8X\n",
139                                               (u32) source_desc->integer.
140                                               value));
141                 } else {
142                         ACPI_DEBUG_PRINT_RAW((ACPI_DB_DEBUG_OBJECT,
143                                               "0x%8.8X%8.8X\n",
144                                               ACPI_FORMAT_UINT64(source_desc->
145                                                                  integer.
146                                                                  value)));
147                 }
148                 break;
149
150         case ACPI_TYPE_BUFFER:
151
152                 ACPI_DEBUG_PRINT_RAW((ACPI_DB_DEBUG_OBJECT, "[0x%.2X]\n",
153                                       (u32) source_desc->buffer.length));
154                 ACPI_DUMP_BUFFER(source_desc->buffer.pointer,
155                                  (source_desc->buffer.length <
156                                   256) ? source_desc->buffer.length : 256);
157                 break;
158
159         case ACPI_TYPE_STRING:
160
161                 ACPI_DEBUG_PRINT_RAW((ACPI_DB_DEBUG_OBJECT, "[0x%.2X] \"%s\"\n",
162                                       source_desc->string.length,
163                                       source_desc->string.pointer));
164                 break;
165
166         case ACPI_TYPE_PACKAGE:
167
168                 ACPI_DEBUG_PRINT_RAW((ACPI_DB_DEBUG_OBJECT,
169                                       "[Contains 0x%.2X Elements]\n",
170                                       source_desc->package.count));
171
172                 /* Output the entire contents of the package */
173
174                 for (i = 0; i < source_desc->package.count; i++) {
175                         acpi_ex_do_debug_object(source_desc->package.
176                                                 elements[i], level + 4, i + 1);
177                 }
178                 break;
179
180         case ACPI_TYPE_LOCAL_REFERENCE:
181
182                 if (source_desc->reference.opcode == AML_INDEX_OP) {
183                         ACPI_DEBUG_PRINT_RAW((ACPI_DB_DEBUG_OBJECT,
184                                               "[%s, 0x%X]\n",
185                                               acpi_ps_get_opcode_name
186                                               (source_desc->reference.opcode),
187                                               source_desc->reference.offset));
188                 } else {
189                         ACPI_DEBUG_PRINT_RAW((ACPI_DB_DEBUG_OBJECT, "[%s]",
190                                               acpi_ps_get_opcode_name
191                                               (source_desc->reference.opcode)));
192                 }
193
194                 if (source_desc->reference.opcode == AML_LOAD_OP) {     /* Load and load_table */
195                         ACPI_DEBUG_PRINT_RAW((ACPI_DB_DEBUG_OBJECT,
196                                               " Table OwnerId %p\n",
197                                               source_desc->reference.object));
198                         break;
199                 }
200
201                 ACPI_DEBUG_PRINT_RAW((ACPI_DB_DEBUG_OBJECT, "  "));
202
203                 /* Check for valid node first, then valid object */
204
205                 if (source_desc->reference.node) {
206                         if (ACPI_GET_DESCRIPTOR_TYPE
207                             (source_desc->reference.node) !=
208                             ACPI_DESC_TYPE_NAMED) {
209                                 ACPI_DEBUG_PRINT_RAW((ACPI_DB_DEBUG_OBJECT,
210                                                       " %p - Not a valid namespace node\n",
211                                                       source_desc->reference.
212                                                       node));
213                         } else {
214                                 ACPI_DEBUG_PRINT_RAW((ACPI_DB_DEBUG_OBJECT,
215                                                       "Node %p [%4.4s] ",
216                                                       source_desc->reference.
217                                                       node,
218                                                       (source_desc->reference.
219                                                        node)->name.ascii));
220
221                                 switch ((source_desc->reference.node)->type) {
222
223                                         /* These types have no attached object */
224
225                                 case ACPI_TYPE_DEVICE:
226                                         acpi_os_printf("Device\n");
227                                         break;
228
229                                 case ACPI_TYPE_THERMAL:
230                                         acpi_os_printf("Thermal Zone\n");
231                                         break;
232
233                                 default:
234                                         acpi_ex_do_debug_object((source_desc->
235                                                                  reference.
236                                                                  node)->object,
237                                                                 level + 4, 0);
238                                         break;
239                                 }
240                         }
241                 } else if (source_desc->reference.object) {
242                         if (ACPI_GET_DESCRIPTOR_TYPE
243                             (source_desc->reference.object) ==
244                             ACPI_DESC_TYPE_NAMED) {
245                                 acpi_ex_do_debug_object(((struct
246                                                           acpi_namespace_node *)
247                                                          source_desc->reference.
248                                                          object)->object,
249                                                         level + 4, 0);
250                         } else {
251                                 acpi_ex_do_debug_object(source_desc->reference.
252                                                         object, level + 4, 0);
253                         }
254                 }
255                 break;
256
257         default:
258
259                 ACPI_DEBUG_PRINT_RAW((ACPI_DB_DEBUG_OBJECT, "%p\n",
260                                       source_desc));
261                 break;
262         }
263
264         ACPI_DEBUG_PRINT_RAW((ACPI_DB_EXEC, "\n"));
265         return_VOID;
266 }
267
268 /*******************************************************************************
269  *
270  * FUNCTION:    acpi_ex_store
271  *
272  * PARAMETERS:  *source_desc        - Value to be stored
273  *              *dest_desc          - Where to store it.  Must be an NS node
274  *                                    or an union acpi_operand_object of type
275  *                                    Reference;
276  *              walk_state          - Current walk state
277  *
278  * RETURN:      Status
279  *
280  * DESCRIPTION: Store the value described by source_desc into the location
281  *              described by dest_desc. Called by various interpreter
282  *              functions to store the result of an operation into
283  *              the destination operand -- not just simply the actual "Store"
284  *              ASL operator.
285  *
286  ******************************************************************************/
287
288 acpi_status
289 acpi_ex_store(union acpi_operand_object *source_desc,
290               union acpi_operand_object *dest_desc,
291               struct acpi_walk_state *walk_state)
292 {
293         acpi_status status = AE_OK;
294         union acpi_operand_object *ref_desc = dest_desc;
295
296         ACPI_FUNCTION_TRACE_PTR(ex_store, dest_desc);
297
298         /* Validate parameters */
299
300         if (!source_desc || !dest_desc) {
301                 ACPI_ERROR((AE_INFO, "Null parameter"));
302                 return_ACPI_STATUS(AE_AML_NO_OPERAND);
303         }
304
305         /* dest_desc can be either a namespace node or an ACPI object */
306
307         if (ACPI_GET_DESCRIPTOR_TYPE(dest_desc) == ACPI_DESC_TYPE_NAMED) {
308                 /*
309                  * Dest is a namespace node,
310                  * Storing an object into a Named node.
311                  */
312                 status = acpi_ex_store_object_to_node(source_desc,
313                                                       (struct
314                                                        acpi_namespace_node *)
315                                                       dest_desc, walk_state,
316                                                       ACPI_IMPLICIT_CONVERSION);
317
318                 return_ACPI_STATUS(status);
319         }
320
321         /* Destination object must be a Reference or a Constant object */
322
323         switch (ACPI_GET_OBJECT_TYPE(dest_desc)) {
324         case ACPI_TYPE_LOCAL_REFERENCE:
325                 break;
326
327         case ACPI_TYPE_INTEGER:
328
329                 /* Allow stores to Constants -- a Noop as per ACPI spec */
330
331                 if (dest_desc->common.flags & AOPOBJ_AML_CONSTANT) {
332                         return_ACPI_STATUS(AE_OK);
333                 }
334
335                 /*lint -fallthrough */
336
337         default:
338
339                 /* Destination is not a Reference object */
340
341                 ACPI_ERROR((AE_INFO,
342                             "Target is not a Reference or Constant object - %s [%p]",
343                             acpi_ut_get_object_type_name(dest_desc),
344                             dest_desc));
345
346                 return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
347         }
348
349         /*
350          * Examine the Reference opcode.  These cases are handled:
351          *
352          * 1) Store to Name (Change the object associated with a name)
353          * 2) Store to an indexed area of a Buffer or Package
354          * 3) Store to a Method Local or Arg
355          * 4) Store to the debug object
356          */
357         switch (ref_desc->reference.opcode) {
358         case AML_REF_OF_OP:
359
360                 /* Storing an object into a Name "container" */
361
362                 status = acpi_ex_store_object_to_node(source_desc,
363                                                       ref_desc->reference.
364                                                       object, walk_state,
365                                                       ACPI_IMPLICIT_CONVERSION);
366                 break;
367
368         case AML_INDEX_OP:
369
370                 /* Storing to an Index (pointer into a packager or buffer) */
371
372                 status =
373                     acpi_ex_store_object_to_index(source_desc, ref_desc,
374                                                   walk_state);
375                 break;
376
377         case AML_LOCAL_OP:
378         case AML_ARG_OP:
379
380                 /* Store to a method local/arg  */
381
382                 status =
383                     acpi_ds_store_object_to_local(ref_desc->reference.opcode,
384                                                   ref_desc->reference.offset,
385                                                   source_desc, walk_state);
386                 break;
387
388         case AML_DEBUG_OP:
389
390                 /*
391                  * Storing to the Debug object causes the value stored to be
392                  * displayed and otherwise has no effect -- see ACPI Specification
393                  */
394                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
395                                   "**** Write to Debug Object: Object %p %s ****:\n\n",
396                                   source_desc,
397                                   acpi_ut_get_object_type_name(source_desc)));
398
399                 acpi_ex_do_debug_object(source_desc, 0, 0);
400                 break;
401
402         default:
403
404                 ACPI_ERROR((AE_INFO, "Unknown Reference opcode %X",
405                             ref_desc->reference.opcode));
406                 ACPI_DUMP_ENTRY(ref_desc, ACPI_LV_ERROR);
407
408                 status = AE_AML_INTERNAL;
409                 break;
410         }
411
412         return_ACPI_STATUS(status);
413 }
414
415 /*******************************************************************************
416  *
417  * FUNCTION:    acpi_ex_store_object_to_index
418  *
419  * PARAMETERS:  *source_desc            - Value to be stored
420  *              *dest_desc              - Named object to receive the value
421  *              walk_state              - Current walk state
422  *
423  * RETURN:      Status
424  *
425  * DESCRIPTION: Store the object to indexed Buffer or Package element
426  *
427  ******************************************************************************/
428
429 static acpi_status
430 acpi_ex_store_object_to_index(union acpi_operand_object *source_desc,
431                               union acpi_operand_object *index_desc,
432                               struct acpi_walk_state *walk_state)
433 {
434         acpi_status status = AE_OK;
435         union acpi_operand_object *obj_desc;
436         union acpi_operand_object *new_desc;
437         u8 value = 0;
438         u32 i;
439
440         ACPI_FUNCTION_TRACE(ex_store_object_to_index);
441
442         /*
443          * Destination must be a reference pointer, and
444          * must point to either a buffer or a package
445          */
446         switch (index_desc->reference.target_type) {
447         case ACPI_TYPE_PACKAGE:
448                 /*
449                  * Storing to a package element. Copy the object and replace
450                  * any existing object with the new object. No implicit
451                  * conversion is performed.
452                  *
453                  * The object at *(index_desc->Reference.Where) is the
454                  * element within the package that is to be modified.
455                  * The parent package object is at index_desc->Reference.Object
456                  */
457                 obj_desc = *(index_desc->reference.where);
458
459                 if (ACPI_GET_OBJECT_TYPE(source_desc) ==
460                     ACPI_TYPE_LOCAL_REFERENCE
461                     && source_desc->reference.opcode == AML_LOAD_OP) {
462
463                         /* This is a DDBHandle, just add a reference to it */
464
465                         acpi_ut_add_reference(source_desc);
466                         new_desc = source_desc;
467                 } else {
468                         /* Normal object, copy it */
469
470                         status =
471                             acpi_ut_copy_iobject_to_iobject(source_desc,
472                                                             &new_desc,
473                                                             walk_state);
474                         if (ACPI_FAILURE(status)) {
475                                 return_ACPI_STATUS(status);
476                         }
477                 }
478
479                 if (obj_desc) {
480
481                         /* Decrement reference count by the ref count of the parent package */
482
483                         for (i = 0; i < ((union acpi_operand_object *)
484                                          index_desc->reference.object)->common.
485                              reference_count; i++) {
486                                 acpi_ut_remove_reference(obj_desc);
487                         }
488                 }
489
490                 *(index_desc->reference.where) = new_desc;
491
492                 /* Increment ref count by the ref count of the parent package-1 */
493
494                 for (i = 1; i < ((union acpi_operand_object *)
495                                  index_desc->reference.object)->common.
496                      reference_count; i++) {
497                         acpi_ut_add_reference(new_desc);
498                 }
499
500                 break;
501
502         case ACPI_TYPE_BUFFER_FIELD:
503
504                 /*
505                  * Store into a Buffer or String (not actually a real buffer_field)
506                  * at a location defined by an Index.
507                  *
508                  * The first 8-bit element of the source object is written to the
509                  * 8-bit Buffer location defined by the Index destination object,
510                  * according to the ACPI 2.0 specification.
511                  */
512
513                 /*
514                  * Make sure the target is a Buffer or String. An error should
515                  * not happen here, since the reference_object was constructed
516                  * by the INDEX_OP code.
517                  */
518                 obj_desc = index_desc->reference.object;
519                 if ((ACPI_GET_OBJECT_TYPE(obj_desc) != ACPI_TYPE_BUFFER) &&
520                     (ACPI_GET_OBJECT_TYPE(obj_desc) != ACPI_TYPE_STRING)) {
521                         return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
522                 }
523
524                 /*
525                  * The assignment of the individual elements will be slightly
526                  * different for each source type.
527                  */
528                 switch (ACPI_GET_OBJECT_TYPE(source_desc)) {
529                 case ACPI_TYPE_INTEGER:
530
531                         /* Use the least-significant byte of the integer */
532
533                         value = (u8) (source_desc->integer.value);
534                         break;
535
536                 case ACPI_TYPE_BUFFER:
537                 case ACPI_TYPE_STRING:
538
539                         /* Note: Takes advantage of common string/buffer fields */
540
541                         value = source_desc->buffer.pointer[0];
542                         break;
543
544                 default:
545
546                         /* All other types are invalid */
547
548                         ACPI_ERROR((AE_INFO,
549                                     "Source must be Integer/Buffer/String type, not %s",
550                                     acpi_ut_get_object_type_name(source_desc)));
551                         return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
552                 }
553
554                 /* Store the source value into the target buffer byte */
555
556                 obj_desc->buffer.pointer[index_desc->reference.offset] = value;
557                 break;
558
559         default:
560                 ACPI_ERROR((AE_INFO, "Target is not a Package or BufferField"));
561                 status = AE_AML_OPERAND_TYPE;
562                 break;
563         }
564
565         return_ACPI_STATUS(status);
566 }
567
568 /*******************************************************************************
569  *
570  * FUNCTION:    acpi_ex_store_object_to_node
571  *
572  * PARAMETERS:  source_desc             - Value to be stored
573  *              Node                    - Named object to receive the value
574  *              walk_state              - Current walk state
575  *              implicit_conversion     - Perform implicit conversion (yes/no)
576  *
577  * RETURN:      Status
578  *
579  * DESCRIPTION: Store the object to the named object.
580  *
581  *              The Assignment of an object to a named object is handled here
582  *              The value passed in will replace the current value (if any)
583  *              with the input value.
584  *
585  *              When storing into an object the data is converted to the
586  *              target object type then stored in the object.  This means
587  *              that the target object type (for an initialized target) will
588  *              not be changed by a store operation.
589  *
590  *              Assumes parameters are already validated.
591  *
592  ******************************************************************************/
593
594 acpi_status
595 acpi_ex_store_object_to_node(union acpi_operand_object *source_desc,
596                              struct acpi_namespace_node *node,
597                              struct acpi_walk_state *walk_state,
598                              u8 implicit_conversion)
599 {
600         acpi_status status = AE_OK;
601         union acpi_operand_object *target_desc;
602         union acpi_operand_object *new_desc;
603         acpi_object_type target_type;
604
605         ACPI_FUNCTION_TRACE_PTR(ex_store_object_to_node, source_desc);
606
607         /* Get current type of the node, and object attached to Node */
608
609         target_type = acpi_ns_get_type(node);
610         target_desc = acpi_ns_get_attached_object(node);
611
612         ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Storing %p(%s) into node %p(%s)\n",
613                           source_desc,
614                           acpi_ut_get_object_type_name(source_desc), node,
615                           acpi_ut_get_type_name(target_type)));
616
617         /*
618          * Resolve the source object to an actual value
619          * (If it is a reference object)
620          */
621         status = acpi_ex_resolve_object(&source_desc, target_type, walk_state);
622         if (ACPI_FAILURE(status)) {
623                 return_ACPI_STATUS(status);
624         }
625
626         /* If no implicit conversion, drop into the default case below */
627
628         if ((!implicit_conversion) ||
629             ((walk_state->opcode == AML_COPY_OP) &&
630              (target_type != ACPI_TYPE_LOCAL_REGION_FIELD) &&
631              (target_type != ACPI_TYPE_LOCAL_BANK_FIELD) &&
632              (target_type != ACPI_TYPE_LOCAL_INDEX_FIELD))) {
633                 /*
634                  * Force execution of default (no implicit conversion). Note:
635                  * copy_object does not perform an implicit conversion, as per the ACPI
636                  * spec -- except in case of region/bank/index fields -- because these
637                  * objects must retain their original type permanently.
638                  */
639                 target_type = ACPI_TYPE_ANY;
640         }
641
642         /* Do the actual store operation */
643
644         switch (target_type) {
645         case ACPI_TYPE_BUFFER_FIELD:
646         case ACPI_TYPE_LOCAL_REGION_FIELD:
647         case ACPI_TYPE_LOCAL_BANK_FIELD:
648         case ACPI_TYPE_LOCAL_INDEX_FIELD:
649
650                 /* For fields, copy the source data to the target field. */
651
652                 status = acpi_ex_write_data_to_field(source_desc, target_desc,
653                                                      &walk_state->result_obj);
654                 break;
655
656         case ACPI_TYPE_INTEGER:
657         case ACPI_TYPE_STRING:
658         case ACPI_TYPE_BUFFER:
659
660                 /*
661                  * These target types are all of type Integer/String/Buffer, and
662                  * therefore support implicit conversion before the store.
663                  *
664                  * Copy and/or convert the source object to a new target object
665                  */
666                 status =
667                     acpi_ex_store_object_to_object(source_desc, target_desc,
668                                                    &new_desc, walk_state);
669                 if (ACPI_FAILURE(status)) {
670                         return_ACPI_STATUS(status);
671                 }
672
673                 if (new_desc != target_desc) {
674                         /*
675                          * Store the new new_desc as the new value of the Name, and set
676                          * the Name's type to that of the value being stored in it.
677                          * source_desc reference count is incremented by attach_object.
678                          *
679                          * Note: This may change the type of the node if an explicit store
680                          * has been performed such that the node/object type has been
681                          * changed.
682                          */
683                         status =
684                             acpi_ns_attach_object(node, new_desc,
685                                                   new_desc->common.type);
686
687                         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
688                                           "Store %s into %s via Convert/Attach\n",
689                                           acpi_ut_get_object_type_name
690                                           (source_desc),
691                                           acpi_ut_get_object_type_name
692                                           (new_desc)));
693                 }
694                 break;
695
696         default:
697
698                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
699                                   "Storing %s (%p) directly into node (%p) with no implicit conversion\n",
700                                   acpi_ut_get_object_type_name(source_desc),
701                                   source_desc, node));
702
703                 /* No conversions for all other types.  Just attach the source object */
704
705                 status = acpi_ns_attach_object(node, source_desc,
706                                                ACPI_GET_OBJECT_TYPE
707                                                (source_desc));
708                 break;
709         }
710
711         return_ACPI_STATUS(status);
712 }