summaryrefslogtreecommitdiffstats
path: root/drivers/acpi/utilities/utcopy.c
blob: 84d529db0a6669234082d228ebc0f51f52a24f8f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
/******************************************************************************
 *
 * Module Name: utcopy - Internal to external object translation utilities
 *
 *****************************************************************************/

/*
 * Copyright (C) 2000 - 2007, R. Byron Moore
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions, and the following disclaimer,
 *    without modification.
 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
 *    substantially similar to the "NO WARRANTY" disclaimer below
 *    ("Disclaimer") and any redistribution must be conditioned upon
 *    including a substantially similar Disclaimer requirement for further
 *    binary redistribution.
 * 3. Neither the names of the above-listed copyright holders nor the names
 *    of any contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * Alternatively, this software may be distributed under the terms of the
 * GNU General Public License ("GPL") version 2 as published by the Free
 * Software Foundation.
 *
 * NO WARRANTY
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGES.
 */

#include <acpi/acpi.h>
#include <acpi/amlcode.h>

#define _COMPONENT          ACPI_UTILITIES
ACPI_MODULE_NAME("utcopy")

/* Local prototypes */
static acpi_status
acpi_ut_copy_isimple_to_esimple(union acpi_operand_object *internal_object,
				union acpi_object *external_object,
				u8 * data_space, acpi_size * buffer_space_used);

static acpi_status
acpi_ut_copy_ielement_to_ielement(u8 object_type,
				  union acpi_operand_object *source_object,
				  union acpi_generic_state *state,
				  void *context);

static acpi_status
acpi_ut_copy_ipackage_to_epackage(union acpi_operand_object *internal_object,
				  u8 * buffer, acpi_size * space_used);

static acpi_status
acpi_ut_copy_esimple_to_isimple(union acpi_object *user_obj,
				union acpi_operand_object **return_obj);

static acpi_status
acpi_ut_copy_simple_object(union acpi_operand_object *source_desc,
			   union acpi_operand_object *dest_desc);

static acpi_status
acpi_ut_copy_ielement_to_eelement(u8 object_type,
				  union acpi_operand_object *source_object,
				  union acpi_generic_state *state,
				  void *context);

static acpi_status
acpi_ut_copy_ipackage_to_ipackage(union acpi_operand_object *source_obj,
				  union acpi_operand_object *dest_obj,
				  struct acpi_walk_state *walk_state);

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_copy_isimple_to_esimple
 *
 * PARAMETERS:  internal_object     - Source object to be copied
 *              external_object     - Where to return the copied object
 *              data_space          - Where object data is returned (such as
 *                                    buffer and string data)
 *              buffer_space_used   - Length of data_space that was used
 *
 * RETURN:      Status
 *
 * DESCRIPTION: This function is called to copy a simple internal object to
 *              an external object.
 *
 *              The data_space buffer is assumed to have sufficient space for
 *              the object.
 *
 ******************************************************************************/

static acpi_status
acpi_ut_copy_isimple_to_esimple(union acpi_operand_object *internal_object,
				union acpi_object *external_object,
				u8 * data_space, acpi_size * buffer_space_used)
{
	acpi_status status = AE_OK;

	ACPI_FUNCTION_TRACE(ut_copy_isimple_to_esimple);

	*buffer_space_used = 0;

	/*
	 * Check for NULL object case (could be an uninitialized
	 * package element)
	 */
	if (!internal_object) {
		return_ACPI_STATUS(AE_OK);
	}

	/* Always clear the external object */

	ACPI_MEMSET(external_object, 0, sizeof(union acpi_object));

	/*
	 * In general, the external object will be the same type as
	 * the internal object
	 */
	external_object->type = ACPI_GET_OBJECT_TYPE(internal_object);

	/* However, only a limited number of external types are supported */

	switch (ACPI_GET_OBJECT_TYPE(internal_object)) {
	case ACPI_TYPE_STRING:

		external_object->string.pointer = (char *)data_space;
		external_object->string.length = internal_object->string.length;
		*buffer_space_used = ACPI_ROUND_UP_TO_NATIVE_WORD((acpi_size)
								  internal_object->
								  string.
								  length + 1);

		ACPI_MEMCPY((void *)data_space,
			    (void *)internal_object->string.pointer,
			    (acpi_size) internal_object->string.length + 1);
		break;

	case ACPI_TYPE_BUFFER:

		external_object->buffer.pointer = data_space;
		external_object->buffer.length = internal_object->buffer.length;
		*buffer_space_used =
		    ACPI_ROUND_UP_TO_NATIVE_WORD(internal_object->string.
						 length);

		ACPI_MEMCPY((void *)data_space,
			    (void *)internal_object->buffer.pointer,
			    internal_object->buffer.length);
		break;

	case ACPI_TYPE_INTEGER:

		external_object->integer.value = internal_object->integer.value;
		break;

	case ACPI_TYPE_LOCAL_REFERENCE:

		/*
		 * This is an object reference.  Attempt to dereference it.
		 */
		switch (internal_object->reference.opcode) {
		case AML_INT_NAMEPATH_OP:

			/* For namepath, return the object handle ("reference") */

		default:
			/*
			 * Use the object type of "Any" to indicate a reference
			 * to object containing a handle to an ACPI named object.
			 */
			external_object->type = ACPI_TYPE_ANY;
			external_object->reference.handle =
			    internal_object->reference.node;
			break;
		}
		break;

	case ACPI_TYPE_PROCESSOR:

		external_object->processor.proc_id =
		    internal_object->processor.proc_id;
		external_object->processor.pblk_address =
		    internal_object->processor.address;
		external_object->processor.pblk_length =
		    internal_object->processor.length;
		break;

	case ACPI_TYPE_POWER:

		external_object->power_resource.system_level =
		    internal_object->power_resource.system_level;

		external_object->power_resource.resource_order =
		    internal_object->power_resource.resource_order;
		break;

	default:
		/*
		 * There is no corresponding external object type
		 */
		return_ACPI_STATUS(AE_SUPPORT);
	}

	return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_copy_ielement_to_eelement
 *
 * PARAMETERS:  acpi_pkg_callback
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Copy one package element to another package element
 *
 ******************************************************************************/

static acpi_status
acpi_ut_copy_ielement_to_eelement(u8 object_type,
				  union acpi_operand_object *source_object,
				  union acpi_generic_state *state,
				  void *context)
{
	acpi_status status = AE_OK;
	struct acpi_pkg_info *info = (struct acpi_pkg_info *)context;
	acpi_size object_space;
	u32 this_index;
	union acpi_object *target_object;

	ACPI_FUNCTION_ENTRY();

	this_index = state->pkg.index;
	target_object = (union acpi_object *)
	    &((union acpi_object *)(state->pkg.dest_object))->package.
	    elements[this_index];

	switch (object_type) {
	case ACPI_COPY_TYPE_SIMPLE:

		/*
		 * This is a simple or null object
		 */
		status = acpi_ut_copy_isimple_to_esimple(source_object,
							 target_object,
							 info->free_space,
							 &object_space);
		if (ACPI_FAILURE(status)) {
			return (status);
		}
		break;

	case ACPI_COPY_TYPE_PACKAGE:

		/*
		 * Build the package object
		 */
		target_object->type = ACPI_TYPE_PACKAGE;
		target_object->package.count = source_object->package.count;
		target_object->package.elements =
		    ACPI_CAST_PTR(union acpi_object, info->free_space);

		/*
		 * Pass the new package object back to the package walk routine
		 */
		state->pkg.this_target_obj = target_object;

		/*
		 * Save space for the array of objects (Package elements)
		 * update the buffer length counter
		 */
		object_space = ACPI_ROUND_UP_TO_NATIVE_WORD((acpi_size)
							    target_object->
							    package.count *
							    sizeof(union
								   acpi_object));
		break;

	default:
		return (AE_BAD_PARAMETER);
	}

	info->free_space += object_space;
	info->length += object_space;
	return (status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_copy_ipackage_to_epackage
 *
 * PARAMETERS:  internal_object     - Pointer to the object we are returning
 *              Buffer              - Where the object is returned
 *              space_used          - Where the object length is returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: This function is called to place a package object in a user
 *              buffer.  A package object by definition contains other objects.
 *
 *              The buffer is assumed to have sufficient space for the object.
 *              The caller must have verified the buffer length needed using the
 *              acpi_ut_get_object_size function before calling this function.
 *
 ******************************************************************************/

static acpi_status
acpi_ut_copy_ipackage_to_epackage(union acpi_operand_object *internal_object,
				  u8 * buffer, acpi_size * space_used)
{
	union acpi_object *external_object;
	acpi_status status;
	struct acpi_pkg_info info;

	ACPI_FUNCTION_TRACE(ut_copy_ipackage_to_epackage);

	/*
	 * First package at head of the buffer
	 */
	external_object = ACPI_CAST_PTR(union acpi_object, buffer);

	/*
	 * Free space begins right after the first package
	 */
	info.length = ACPI_ROUND_UP_TO_NATIVE_WORD(sizeof(union acpi_object));
	info.free_space =
	    buffer + ACPI_ROUND_UP_TO_NATIVE_WORD(sizeof(union acpi_object));
	info.object_space = 0;
	info.num_packages = 1;

	external_object->type = ACPI_GET_OBJECT_TYPE(internal_object);
	external_object->package.count = internal_object->package.count;
	external_object->package.elements = ACPI_CAST_PTR(union acpi_object,
							  info.free_space);

	/*
	 * Leave room for an array of ACPI_OBJECTS in the buffer
	 * and move the free space past it
	 */
	info.length += (acpi_size) external_object->package.count *
	    ACPI_ROUND_UP_TO_NATIVE_WORD(sizeof(union acpi_object));
	info.free_space += external_object->package.count *
	    ACPI_ROUND_UP_TO_NATIVE_WORD(sizeof(union acpi_object));

	status = acpi_ut_walk_package_tree(internal_object, external_object,
					   acpi_ut_copy_ielement_to_eelement,
					   &info);

	*space_used = info.length;
	return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_copy_iobject_to_eobject
 *
 * PARAMETERS:  internal_object     - The internal object to be converted
 *              buffer_ptr          - Where the object is returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: This function is called to build an API object to be returned to
 *              the caller.
 *
 ******************************************************************************/

acpi_status
acpi_ut_copy_iobject_to_eobject(union acpi_operand_object *internal_object,
				struct acpi_buffer *ret_buffer)
{
	acpi_status status;

	ACPI_FUNCTION_TRACE(ut_copy_iobject_to_eobject);

	if (ACPI_GET_OBJECT_TYPE(internal_object) == ACPI_TYPE_PACKAGE) {
		/*
		 * Package object:  Copy all subobjects (including
		 * nested packages)
		 */
		status = acpi_ut_copy_ipackage_to_epackage(internal_object,
							   ret_buffer->pointer,
							   &ret_buffer->length);
	} else {
		/*
		 * Build a simple object (no nested objects)
		 */
		status = acpi_ut_copy_isimple_to_esimple(internal_object,
							 ACPI_CAST_PTR(union
								       acpi_object,
								       ret_buffer->
								       pointer),
							 ACPI_ADD_PTR(u8,
								      ret_buffer->
								      pointer,
								      ACPI_ROUND_UP_TO_NATIVE_WORD
								      (sizeof
								       (union
									acpi_object))),
							 &ret_buffer->length);
		/*
		 * build simple does not include the object size in the length
		 * so we add it in here
		 */
		ret_buffer->length += sizeof(union acpi_object);
	}

	return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_copy_esimple_to_isimple
 *
 * PARAMETERS:  external_object     - The external object to be converted
 *              ret_internal_object - Where the internal object is returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: This function copies an external object to an internal one.
 *              NOTE: Pointers can be copied, we don't need to copy data.
 *              (The pointers have to be valid in our address space no matter
 *              what we do with them!)
 *
 ******************************************************************************/

static acpi_status
acpi_ut_copy_esimple_to_isimple(union acpi_object *external_object,
				union acpi_operand_object **ret_internal_object)
{
	union acpi_operand_object *internal_object;

	ACPI_FUNCTION_TRACE(ut_copy_esimple_to_isimple);

	/*
	 * Simple types supported are: String, Buffer, Integer
	 */
	switch (external_object->type) {
	case ACPI_TYPE_STRING:
	case ACPI_TYPE_BUFFER:
	case ACPI_TYPE_INTEGER:

		internal_object = acpi_ut_create_internal_object((u8)
								 external_object->
								 type);
		if (!internal_object) {
			return_ACPI_STATUS(AE_NO_MEMORY);
		}
		break;

	default:
		/* All other types are not supported */

		return_ACPI_STATUS(AE_SUPPORT);
	}

	/* Must COPY string and buffer contents */

	switch (external_object->type) {
	case ACPI_TYPE_STRING:

		internal_object->string.pointer =
		    ACPI_ALLOCATE_ZEROED((acpi_size) external_object->string.
					 length + 1);
		if (!internal_object->string.pointer) {
			goto error_exit;
		}

		ACPI_MEMCPY(internal_object->string.pointer,
			    external_object->string.pointer,
			    external_object->string.length);

		internal_object->string.length = external_object->string.length;
		break;

	case ACPI_TYPE_BUFFER:

		internal_object->buffer.pointer =
		    ACPI_ALLOCATE_ZEROED(external_object->buffer.length);
		if (!internal_object->buffer.pointer) {
			goto error_exit;
		}

		ACPI_MEMCPY(internal_object->buffer.pointer,
			    external_object->buffer.pointer,
			    external_object->buffer.length);

		internal_object->buffer.length = external_object->buffer.length;
		break;

	case ACPI_TYPE_INTEGER:

		internal_object->integer.value = external_object->integer.value;
		break;

	default:
		/* Other types can't get here */
		break;
	}

	*ret_internal_object = internal_object;
	return_ACPI_STATUS(AE_OK);

      error_exit:
	acpi_ut_remove_reference(internal_object);
	return_ACPI_STATUS(AE_NO_MEMORY);
}

#ifdef ACPI_FUTURE_IMPLEMENTATION
/* Code to convert packages that are parameters to control methods */

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_copy_epackage_to_ipackage
 *
 * PARAMETERS:  *internal_object   - Pointer to the object we are returning
 *              *Buffer            - Where the object is returned
 *              *space_used        - Where the length of the object is returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: This function is called to place a package object in a user
 *              buffer.  A package object by definition contains other objects.
 *
 *              The buffer is assumed to have sufficient space for the object.
 *              The caller must have verified the buffer length needed using the
 *              acpi_ut_get_object_size function before calling this function.
 *
 ******************************************************************************/

static acpi_status
acpi_ut_copy_epackage_to_ipackage(union acpi_operand_object *internal_object,
				  u8 * buffer, u32 * space_used)
{
	u8 *free_space;
	union acpi_object *external_object;
	u32 length = 0;
	u32 this_index;
	u32 object_space = 0;
	union acpi_operand_object *this_internal_obj;
	union acpi_object *this_external_obj;

	ACPI_FUNCTION_TRACE(ut_copy_epackage_to_ipackage);

	/*
	 * First package at head of the buffer
	 */
	external_object = (union acpi_object *)buffer;

	/*
	 * Free space begins right after the first package
	 */
	free_space = buffer + sizeof(union acpi_object);

	external_object->type = ACPI_GET_OBJECT_TYPE(internal_object);
	external_object->package.count = internal_object->package.count;
	external_object->package.elements = (union acpi_object *)free_space;

	/*
	 * Build an array of ACPI_OBJECTS in the buffer
	 * and move the free space past it
	 */
	free_space +=
	    external_object->package.count * sizeof(union acpi_object);

	/* Call walk_package */

}

#endif				/* Future implementation */

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_copy_eobject_to_iobject
 *
 * PARAMETERS:  *internal_object   - The external object to be converted
 *              *buffer_ptr     - Where the internal object is returned
 *
 * RETURN:      Status          - the status of the call
 *
 * DESCRIPTION: Converts an external object to an internal object.
 *
 ******************************************************************************/

acpi_status
acpi_ut_copy_eobject_to_iobject(union acpi_object *external_object,
				union acpi_operand_object **internal_object)
{
	acpi_status status;

	ACPI_FUNCTION_TRACE(ut_copy_eobject_to_iobject);

	if (external_object->type == ACPI_TYPE_PACKAGE) {
		/*
		 * Packages as external input to control methods are not supported,
		 */
		ACPI_ERROR((AE_INFO,
			    "Packages as parameters not implemented!"));

		return_ACPI_STATUS(AE_NOT_IMPLEMENTED);
	}

	else {
		/*
		 * Build a simple object (no nested objects)
		 */
		status =
		    acpi_ut_copy_esimple_to_isimple(external_object,
						    internal_object);
	}

	return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_copy_simple_object
 *
 * PARAMETERS:  source_desc         - The internal object to be copied
 *              dest_desc           - New target object
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Simple copy of one internal object to another.  Reference count
 *              of the destination object is preserved.
 *
 ******************************************************************************/

static acpi_status
acpi_ut_copy_simple_object(union acpi_operand_object *source_desc,
			   union acpi_operand_object *dest_desc)
{
	u16 reference_count;
	union acpi_operand_object *next_object;

	/* Save fields from destination that we don't want to overwrite */

	reference_count = dest_desc->common.reference_count;
	next_object = dest_desc->common.next_object;

	/* Copy the entire source object over the destination object */

	ACPI_MEMCPY((char *)dest_desc, (char *)source_desc,
		    sizeof(union acpi_operand_object));

	/* Restore the saved fields */

	dest_desc->common.reference_count = reference_count;
	dest_desc->common.next_object = next_object;

	/* New object is not static, regardless of source */

	dest_desc->common.flags &= ~AOPOBJ_STATIC_POINTER;

	/* Handle the objects with extra data */

	switch (ACPI_GET_OBJECT_TYPE(dest_desc)) {
	case ACPI_TYPE_BUFFER:
		/*
		 * Allocate and copy the actual buffer if and only if:
		 * 1) There is a valid buffer pointer
		 * 2) The buffer has a length > 0
		 */
		if ((source_desc->buffer.pointer) &&
		    (source_desc->buffer.length)) {
			dest_desc->buffer.pointer =
			    ACPI_ALLOCATE(source_desc->buffer.length);
			if (!dest_desc->buffer.pointer) {
				return (AE_NO_MEMORY);
			}

			/* Copy the actual buffer data */

			ACPI_MEMCPY(dest_desc->buffer.pointer,
				    source_desc->buffer.pointer,
				    source_desc->buffer.length);
		}
		break;

	case ACPI_TYPE_STRING:
		/*
		 * Allocate and copy the actual string if and only if:
		 * 1) There is a valid string pointer
		 * (Pointer to a NULL string is allowed)
		 */
		if (source_desc->string.pointer) {
			dest_desc->string.pointer =
			    ACPI_ALLOCATE((acpi_size) source_desc->string.
					  length + 1);
			if (!dest_desc->string.pointer) {
				return (AE_NO_MEMORY);
			}

			/* Copy the actual string data */

			ACPI_MEMCPY(dest_desc->string.pointer,
				    source_desc->string.pointer,
				    (acpi_size) source_desc->string.length + 1);
		}
		break;

	case ACPI_TYPE_LOCAL_REFERENCE:
		/*
		 * We copied the reference object, so we now must add a reference
		 * to the object pointed to by the reference
		 */
		acpi_ut_add_reference(source_desc->reference.object);
		break;

	case ACPI_TYPE_REGION:
		/*
		 * We copied the Region Handler, so we now must add a reference
		 */
		if (dest_desc->region.handler) {
			acpi_ut_add_reference(dest_desc->region.handler);
		}
		break;

	default:
		/* Nothing to do for other simple objects */
		break;
	}

	return (AE_OK);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_copy_ielement_to_ielement
 *
 * PARAMETERS:  acpi_pkg_callback
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Copy one package element to another package element
 *
 ******************************************************************************/

static acpi_status
acpi_ut_copy_ielement_to_ielement(u8 object_type,
				  union acpi_operand_object *source_object,
				  union acpi_generic_state *state,
				  void *context)
{
	acpi_status status = AE_OK;
	u32 this_index;
	union acpi_operand_object **this_target_ptr;
	union acpi_operand_object *target_object;

	ACPI_FUNCTION_ENTRY();

	this_index = state->pkg.index;
	this_target_ptr = (union acpi_operand_object **)
	    &state->pkg.dest_object->package.elements[this_index];

	switch (object_type) {
	case ACPI_COPY_TYPE_SIMPLE:

		/* A null source object indicates a (legal) null package element */

		if (source_object) {
			/*
			 * This is a simple object, just copy it
			 */
			target_object =
			    acpi_ut_create_internal_object(ACPI_GET_OBJECT_TYPE
							   (source_object));
			if (!target_object) {
				return (AE_NO_MEMORY);
			}

			status =
			    acpi_ut_copy_simple_object(source_object,
						       target_object);
			if (ACPI_FAILURE(status)) {
				goto error_exit;
			}

			*this_target_ptr = target_object;
		} else {
			/* Pass through a null element */

			*this_target_ptr = NULL;
		}
		break;

	case ACPI_COPY_TYPE_PACKAGE:

		/*
		 * This object is a package - go down another nesting level
		 * Create and build the package object
		 */
		target_object =
		    acpi_ut_create_internal_object(ACPI_TYPE_PACKAGE);
		if (!target_object) {
			return (AE_NO_MEMORY);
		}

		target_object->package.count = source_object->package.count;
		target_object->common.flags = source_object->common.flags;

		/*
		 * Create the object array
		 */
		target_object->package.elements = ACPI_ALLOCATE_ZEROED(((acpi_size) source_object->package.count + 1) * sizeof(void *));
		if (!target_object->package.elements) {
			status = AE_NO_MEMORY;
			goto error_exit;
		}

		/*
		 * Pass the new package object back to the package walk routine
		 */
		state->pkg.this_target_obj = target_object;

		/*
		 * Store the object pointer in the parent package object
		 */
		*this_target_ptr = target_object;
		break;

	default:
		return (AE_BAD_PARAMETER);
	}

	return (status);

      error_exit:
	acpi_ut_remove_reference(target_object);
	return (status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_copy_ipackage_to_ipackage
 *
 * PARAMETERS:  *source_obj     - Pointer to the source package object
 *              *dest_obj       - Where the internal object is returned
 *
 * RETURN:      Status          - the status of the call
 *
 * DESCRIPTION: This function is called to copy an internal package object
 *              into another internal package object.
 *
 ******************************************************************************/

static acpi_status
acpi_ut_copy_ipackage_to_ipackage(union acpi_operand_object *source_obj,
				  union acpi_operand_object *dest_obj,
				  struct acpi_walk_state *walk_state)
{
	acpi_status status = AE_OK;

	ACPI_FUNCTION_TRACE(ut_copy_ipackage_to_ipackage);

	dest_obj->common.type = ACPI_GET_OBJECT_TYPE(source_obj);
	dest_obj->common.flags = source_obj->common.flags;
	dest_obj->package.count = source_obj->package.count;

	/*
	 * Create the object array and walk the source package tree
	 */
	dest_obj->package.elements = ACPI_ALLOCATE_ZEROED(((acpi_size)
							   source_obj->package.
							   count +
							   1) * sizeof(void *));
	if (!dest_obj->package.elements) {
		ACPI_ERROR((AE_INFO, "Package allocation failure"));
		return_ACPI_STATUS(AE_NO_MEMORY);
	}

	/*
	 * Copy the package element-by-element by walking the package "tree".
	 * This handles nested packages of arbitrary depth.
	 */
	status = acpi_ut_walk_package_tree(source_obj, dest_obj,
					   acpi_ut_copy_ielement_to_ielement,
					   walk_state);
	if (ACPI_FAILURE(status)) {

		/* On failure, delete the destination package object */

		acpi_ut_remove_reference(dest_obj);
	}

	return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_copy_iobject_to_iobject
 *
 * PARAMETERS:  walk_state          - Current walk state
 *              source_desc         - The internal object to be copied
 *              dest_desc           - Where the copied object is returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Copy an internal object to a new internal object
 *
 ******************************************************************************/

acpi_status
acpi_ut_copy_iobject_to_iobject(union acpi_operand_object *source_desc,
				union acpi_operand_object **dest_desc,
				struct acpi_walk_state *walk_state)
{
	acpi_status status = AE_OK;

	ACPI_FUNCTION_TRACE(ut_copy_iobject_to_iobject);

	/* Create the top level object */

	*dest_desc =
	    acpi_ut_create_internal_object(ACPI_GET_OBJECT_TYPE(source_desc));
	if (!*dest_desc) {
		return_ACPI_STATUS(AE_NO_MEMORY);
	}

	/* Copy the object and possible subobjects */

	if (ACPI_GET_OBJECT_TYPE(source_desc) == ACPI_TYPE_PACKAGE) {
		status =
		    acpi_ut_copy_ipackage_to_ipackage(source_desc, *dest_desc,
						      walk_state);
	} else {
		status = acpi_ut_copy_simple_object(source_desc, *dest_desc);
	}

	return_ACPI_STATUS(status);
}