Merge branch 'linus' into release
[linux-2.6.git] / drivers / acpi / acpica / 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 "accommon.h"
47 #include "acdispat.h"
48 #include "acinterp.h"
49 #include "amlcode.h"
50 #include "acnamesp.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                 ACPI_DEBUG_PRINT_RAW((ACPI_DB_DEBUG_OBJECT, "[%s] ",
183                                       acpi_ut_get_reference_name(source_desc)));
184
185                 /* Decode the reference */
186
187                 switch (source_desc->reference.class) {
188                 case ACPI_REFCLASS_INDEX:
189
190                         ACPI_DEBUG_PRINT_RAW((ACPI_DB_DEBUG_OBJECT, "0x%X\n",
191                                               source_desc->reference.value));
192                         break;
193
194                 case ACPI_REFCLASS_TABLE:
195
196                         ACPI_DEBUG_PRINT_RAW((ACPI_DB_DEBUG_OBJECT,
197                                               "Table Index 0x%X\n",
198                                               source_desc->reference.value));
199                         break;
200
201                 default:
202                         break;
203                 }
204
205                 ACPI_DEBUG_PRINT_RAW((ACPI_DB_DEBUG_OBJECT, "  "));
206
207                 /* Check for valid node first, then valid object */
208
209                 if (source_desc->reference.node) {
210                         if (ACPI_GET_DESCRIPTOR_TYPE
211                             (source_desc->reference.node) !=
212                             ACPI_DESC_TYPE_NAMED) {
213                                 ACPI_DEBUG_PRINT_RAW((ACPI_DB_DEBUG_OBJECT,
214                                                       " %p - Not a valid namespace node\n",
215                                                       source_desc->reference.
216                                                       node));
217                         } else {
218                                 ACPI_DEBUG_PRINT_RAW((ACPI_DB_DEBUG_OBJECT,
219                                                       "Node %p [%4.4s] ",
220                                                       source_desc->reference.
221                                                       node,
222                                                       (source_desc->reference.
223                                                        node)->name.ascii));
224
225                                 switch ((source_desc->reference.node)->type) {
226
227                                         /* These types have no attached object */
228
229                                 case ACPI_TYPE_DEVICE:
230                                         acpi_os_printf("Device\n");
231                                         break;
232
233                                 case ACPI_TYPE_THERMAL:
234                                         acpi_os_printf("Thermal Zone\n");
235                                         break;
236
237                                 default:
238                                         acpi_ex_do_debug_object((source_desc->
239                                                                  reference.
240                                                                  node)->object,
241                                                                 level + 4, 0);
242                                         break;
243                                 }
244                         }
245                 } else if (source_desc->reference.object) {
246                         if (ACPI_GET_DESCRIPTOR_TYPE
247                             (source_desc->reference.object) ==
248                             ACPI_DESC_TYPE_NAMED) {
249                                 acpi_ex_do_debug_object(((struct
250                                                           acpi_namespace_node *)
251                                                          source_desc->reference.
252                                                          object)->object,
253                                                         level + 4, 0);
254                         } else {
255                                 acpi_ex_do_debug_object(source_desc->reference.
256                                                         object, level + 4, 0);
257                         }
258                 }
259                 break;
260
261         default:
262
263                 ACPI_DEBUG_PRINT_RAW((ACPI_DB_DEBUG_OBJECT, "%p\n",
264                                       source_desc));
265                 break;
266         }
267
268         ACPI_DEBUG_PRINT_RAW((ACPI_DB_EXEC, "\n"));
269         return_VOID;
270 }
271
272 /*******************************************************************************
273  *
274  * FUNCTION:    acpi_ex_store
275  *
276  * PARAMETERS:  *source_desc        - Value to be stored
277  *              *dest_desc          - Where to store it.  Must be an NS node
278  *                                    or a union acpi_operand_object of type
279  *                                    Reference;
280  *              walk_state          - Current walk state
281  *
282  * RETURN:      Status
283  *
284  * DESCRIPTION: Store the value described by source_desc into the location
285  *              described by dest_desc. Called by various interpreter
286  *              functions to store the result of an operation into
287  *              the destination operand -- not just simply the actual "Store"
288  *              ASL operator.
289  *
290  ******************************************************************************/
291
292 acpi_status
293 acpi_ex_store(union acpi_operand_object *source_desc,
294               union acpi_operand_object *dest_desc,
295               struct acpi_walk_state *walk_state)
296 {
297         acpi_status status = AE_OK;
298         union acpi_operand_object *ref_desc = dest_desc;
299
300         ACPI_FUNCTION_TRACE_PTR(ex_store, dest_desc);
301
302         /* Validate parameters */
303
304         if (!source_desc || !dest_desc) {
305                 ACPI_ERROR((AE_INFO, "Null parameter"));
306                 return_ACPI_STATUS(AE_AML_NO_OPERAND);
307         }
308
309         /* dest_desc can be either a namespace node or an ACPI object */
310
311         if (ACPI_GET_DESCRIPTOR_TYPE(dest_desc) == ACPI_DESC_TYPE_NAMED) {
312                 /*
313                  * Dest is a namespace node,
314                  * Storing an object into a Named node.
315                  */
316                 status = acpi_ex_store_object_to_node(source_desc,
317                                                       (struct
318                                                        acpi_namespace_node *)
319                                                       dest_desc, walk_state,
320                                                       ACPI_IMPLICIT_CONVERSION);
321
322                 return_ACPI_STATUS(status);
323         }
324
325         /* Destination object must be a Reference or a Constant object */
326
327         switch (ACPI_GET_OBJECT_TYPE(dest_desc)) {
328         case ACPI_TYPE_LOCAL_REFERENCE:
329                 break;
330
331         case ACPI_TYPE_INTEGER:
332
333                 /* Allow stores to Constants -- a Noop as per ACPI spec */
334
335                 if (dest_desc->common.flags & AOPOBJ_AML_CONSTANT) {
336                         return_ACPI_STATUS(AE_OK);
337                 }
338
339                 /*lint -fallthrough */
340
341         default:
342
343                 /* Destination is not a Reference object */
344
345                 ACPI_ERROR((AE_INFO,
346                             "Target is not a Reference or Constant object - %s [%p]",
347                             acpi_ut_get_object_type_name(dest_desc),
348                             dest_desc));
349
350                 return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
351         }
352
353         /*
354          * Examine the Reference class. These cases are handled:
355          *
356          * 1) Store to Name (Change the object associated with a name)
357          * 2) Store to an indexed area of a Buffer or Package
358          * 3) Store to a Method Local or Arg
359          * 4) Store to the debug object
360          */
361         switch (ref_desc->reference.class) {
362         case ACPI_REFCLASS_REFOF:
363
364                 /* Storing an object into a Name "container" */
365
366                 status = acpi_ex_store_object_to_node(source_desc,
367                                                       ref_desc->reference.
368                                                       object, walk_state,
369                                                       ACPI_IMPLICIT_CONVERSION);
370                 break;
371
372         case ACPI_REFCLASS_INDEX:
373
374                 /* Storing to an Index (pointer into a packager or buffer) */
375
376                 status =
377                     acpi_ex_store_object_to_index(source_desc, ref_desc,
378                                                   walk_state);
379                 break;
380
381         case ACPI_REFCLASS_LOCAL:
382         case ACPI_REFCLASS_ARG:
383
384                 /* Store to a method local/arg  */
385
386                 status =
387                     acpi_ds_store_object_to_local(ref_desc->reference.class,
388                                                   ref_desc->reference.value,
389                                                   source_desc, walk_state);
390                 break;
391
392         case ACPI_REFCLASS_DEBUG:
393
394                 /*
395                  * Storing to the Debug object causes the value stored to be
396                  * displayed and otherwise has no effect -- see ACPI Specification
397                  */
398                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
399                                   "**** Write to Debug Object: Object %p %s ****:\n\n",
400                                   source_desc,
401                                   acpi_ut_get_object_type_name(source_desc)));
402
403                 acpi_ex_do_debug_object(source_desc, 0, 0);
404                 break;
405
406         default:
407
408                 ACPI_ERROR((AE_INFO, "Unknown Reference Class %2.2X",
409                             ref_desc->reference.class));
410                 ACPI_DUMP_ENTRY(ref_desc, ACPI_LV_INFO);
411
412                 status = AE_AML_INTERNAL;
413                 break;
414         }
415
416         return_ACPI_STATUS(status);
417 }
418
419 /*******************************************************************************
420  *
421  * FUNCTION:    acpi_ex_store_object_to_index
422  *
423  * PARAMETERS:  *source_desc            - Value to be stored
424  *              *dest_desc              - Named object to receive the value
425  *              walk_state              - Current walk state
426  *
427  * RETURN:      Status
428  *
429  * DESCRIPTION: Store the object to indexed Buffer or Package element
430  *
431  ******************************************************************************/
432
433 static acpi_status
434 acpi_ex_store_object_to_index(union acpi_operand_object *source_desc,
435                               union acpi_operand_object *index_desc,
436                               struct acpi_walk_state *walk_state)
437 {
438         acpi_status status = AE_OK;
439         union acpi_operand_object *obj_desc;
440         union acpi_operand_object *new_desc;
441         u8 value = 0;
442         u32 i;
443
444         ACPI_FUNCTION_TRACE(ex_store_object_to_index);
445
446         /*
447          * Destination must be a reference pointer, and
448          * must point to either a buffer or a package
449          */
450         switch (index_desc->reference.target_type) {
451         case ACPI_TYPE_PACKAGE:
452                 /*
453                  * Storing to a package element. Copy the object and replace
454                  * any existing object with the new object. No implicit
455                  * conversion is performed.
456                  *
457                  * The object at *(index_desc->Reference.Where) is the
458                  * element within the package that is to be modified.
459                  * The parent package object is at index_desc->Reference.Object
460                  */
461                 obj_desc = *(index_desc->reference.where);
462
463                 if (ACPI_GET_OBJECT_TYPE(source_desc) ==
464                     ACPI_TYPE_LOCAL_REFERENCE
465                     && source_desc->reference.class == ACPI_REFCLASS_TABLE) {
466
467                         /* This is a DDBHandle, just add a reference to it */
468
469                         acpi_ut_add_reference(source_desc);
470                         new_desc = source_desc;
471                 } else {
472                         /* Normal object, copy it */
473
474                         status =
475                             acpi_ut_copy_iobject_to_iobject(source_desc,
476                                                             &new_desc,
477                                                             walk_state);
478                         if (ACPI_FAILURE(status)) {
479                                 return_ACPI_STATUS(status);
480                         }
481                 }
482
483                 if (obj_desc) {
484
485                         /* Decrement reference count by the ref count of the parent package */
486
487                         for (i = 0; i < ((union acpi_operand_object *)
488                                          index_desc->reference.object)->common.
489                              reference_count; i++) {
490                                 acpi_ut_remove_reference(obj_desc);
491                         }
492                 }
493
494                 *(index_desc->reference.where) = new_desc;
495
496                 /* Increment ref count by the ref count of the parent package-1 */
497
498                 for (i = 1; i < ((union acpi_operand_object *)
499                                  index_desc->reference.object)->common.
500                      reference_count; i++) {
501                         acpi_ut_add_reference(new_desc);
502                 }
503
504                 break;
505
506         case ACPI_TYPE_BUFFER_FIELD:
507
508                 /*
509                  * Store into a Buffer or String (not actually a real buffer_field)
510                  * at a location defined by an Index.
511                  *
512                  * The first 8-bit element of the source object is written to the
513                  * 8-bit Buffer location defined by the Index destination object,
514                  * according to the ACPI 2.0 specification.
515                  */
516
517                 /*
518                  * Make sure the target is a Buffer or String. An error should
519                  * not happen here, since the reference_object was constructed
520                  * by the INDEX_OP code.
521                  */
522                 obj_desc = index_desc->reference.object;
523                 if ((ACPI_GET_OBJECT_TYPE(obj_desc) != ACPI_TYPE_BUFFER) &&
524                     (ACPI_GET_OBJECT_TYPE(obj_desc) != ACPI_TYPE_STRING)) {
525                         return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
526                 }
527
528                 /*
529                  * The assignment of the individual elements will be slightly
530                  * different for each source type.
531                  */
532                 switch (ACPI_GET_OBJECT_TYPE(source_desc)) {
533                 case ACPI_TYPE_INTEGER:
534
535                         /* Use the least-significant byte of the integer */
536
537                         value = (u8) (source_desc->integer.value);
538                         break;
539
540                 case ACPI_TYPE_BUFFER:
541                 case ACPI_TYPE_STRING:
542
543                         /* Note: Takes advantage of common string/buffer fields */
544
545                         value = source_desc->buffer.pointer[0];
546                         break;
547
548                 default:
549
550                         /* All other types are invalid */
551
552                         ACPI_ERROR((AE_INFO,
553                                     "Source must be Integer/Buffer/String type, not %s",
554                                     acpi_ut_get_object_type_name(source_desc)));
555                         return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
556                 }
557
558                 /* Store the source value into the target buffer byte */
559
560                 obj_desc->buffer.pointer[index_desc->reference.value] = value;
561                 break;
562
563         default:
564                 ACPI_ERROR((AE_INFO, "Target is not a Package or BufferField"));
565                 status = AE_AML_OPERAND_TYPE;
566                 break;
567         }
568
569         return_ACPI_STATUS(status);
570 }
571
572 /*******************************************************************************
573  *
574  * FUNCTION:    acpi_ex_store_object_to_node
575  *
576  * PARAMETERS:  source_desc             - Value to be stored
577  *              Node                    - Named object to receive the value
578  *              walk_state              - Current walk state
579  *              implicit_conversion     - Perform implicit conversion (yes/no)
580  *
581  * RETURN:      Status
582  *
583  * DESCRIPTION: Store the object to the named object.
584  *
585  *              The Assignment of an object to a named object is handled here
586  *              The value passed in will replace the current value (if any)
587  *              with the input value.
588  *
589  *              When storing into an object the data is converted to the
590  *              target object type then stored in the object.  This means
591  *              that the target object type (for an initialized target) will
592  *              not be changed by a store operation.
593  *
594  *              Assumes parameters are already validated.
595  *
596  ******************************************************************************/
597
598 acpi_status
599 acpi_ex_store_object_to_node(union acpi_operand_object *source_desc,
600                              struct acpi_namespace_node *node,
601                              struct acpi_walk_state *walk_state,
602                              u8 implicit_conversion)
603 {
604         acpi_status status = AE_OK;
605         union acpi_operand_object *target_desc;
606         union acpi_operand_object *new_desc;
607         acpi_object_type target_type;
608
609         ACPI_FUNCTION_TRACE_PTR(ex_store_object_to_node, source_desc);
610
611         /* Get current type of the node, and object attached to Node */
612
613         target_type = acpi_ns_get_type(node);
614         target_desc = acpi_ns_get_attached_object(node);
615
616         ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Storing %p(%s) into node %p(%s)\n",
617                           source_desc,
618                           acpi_ut_get_object_type_name(source_desc), node,
619                           acpi_ut_get_type_name(target_type)));
620
621         /*
622          * Resolve the source object to an actual value
623          * (If it is a reference object)
624          */
625         status = acpi_ex_resolve_object(&source_desc, target_type, walk_state);
626         if (ACPI_FAILURE(status)) {
627                 return_ACPI_STATUS(status);
628         }
629
630         /* If no implicit conversion, drop into the default case below */
631
632         if ((!implicit_conversion) ||
633             ((walk_state->opcode == AML_COPY_OP) &&
634              (target_type != ACPI_TYPE_LOCAL_REGION_FIELD) &&
635              (target_type != ACPI_TYPE_LOCAL_BANK_FIELD) &&
636              (target_type != ACPI_TYPE_LOCAL_INDEX_FIELD))) {
637                 /*
638                  * Force execution of default (no implicit conversion). Note:
639                  * copy_object does not perform an implicit conversion, as per the ACPI
640                  * spec -- except in case of region/bank/index fields -- because these
641                  * objects must retain their original type permanently.
642                  */
643                 target_type = ACPI_TYPE_ANY;
644         }
645
646         /* Do the actual store operation */
647
648         switch (target_type) {
649         case ACPI_TYPE_BUFFER_FIELD:
650         case ACPI_TYPE_LOCAL_REGION_FIELD:
651         case ACPI_TYPE_LOCAL_BANK_FIELD:
652         case ACPI_TYPE_LOCAL_INDEX_FIELD:
653
654                 /* For fields, copy the source data to the target field. */
655
656                 status = acpi_ex_write_data_to_field(source_desc, target_desc,
657                                                      &walk_state->result_obj);
658                 break;
659
660         case ACPI_TYPE_INTEGER:
661         case ACPI_TYPE_STRING:
662         case ACPI_TYPE_BUFFER:
663
664                 /*
665                  * These target types are all of type Integer/String/Buffer, and
666                  * therefore support implicit conversion before the store.
667                  *
668                  * Copy and/or convert the source object to a new target object
669                  */
670                 status =
671                     acpi_ex_store_object_to_object(source_desc, target_desc,
672                                                    &new_desc, walk_state);
673                 if (ACPI_FAILURE(status)) {
674                         return_ACPI_STATUS(status);
675                 }
676
677                 if (new_desc != target_desc) {
678                         /*
679                          * Store the new new_desc as the new value of the Name, and set
680                          * the Name's type to that of the value being stored in it.
681                          * source_desc reference count is incremented by attach_object.
682                          *
683                          * Note: This may change the type of the node if an explicit store
684                          * has been performed such that the node/object type has been
685                          * changed.
686                          */
687                         status =
688                             acpi_ns_attach_object(node, new_desc,
689                                                   new_desc->common.type);
690
691                         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
692                                           "Store %s into %s via Convert/Attach\n",
693                                           acpi_ut_get_object_type_name
694                                           (source_desc),
695                                           acpi_ut_get_object_type_name
696                                           (new_desc)));
697                 }
698                 break;
699
700         default:
701
702                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
703                                   "Storing %s (%p) directly into node (%p) with no implicit conversion\n",
704                                   acpi_ut_get_object_type_name(source_desc),
705                                   source_desc, node));
706
707                 /* No conversions for all other types.  Just attach the source object */
708
709                 status = acpi_ns_attach_object(node, source_desc,
710                                                ACPI_GET_OBJECT_TYPE
711                                                (source_desc));
712                 break;
713         }
714
715         return_ACPI_STATUS(status);
716 }