aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/acpi/acpica/nsrepair2.c
blob: c84603ee83ae084312f3936324a1bfb524b64f08 (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
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
/******************************************************************************
 *
 * Module Name: nsrepair2 - Repair for objects returned by specific
 *                          predefined methods
 *
 *****************************************************************************/

/*
 * Copyright (C) 2000 - 2013, Intel Corp.
 * 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 "accommon.h"
#include "acnamesp.h"

#define _COMPONENT          ACPI_NAMESPACE
ACPI_MODULE_NAME("nsrepair2")

/*
 * Information structure and handler for ACPI predefined names that can
 * be repaired on a per-name basis.
 */
typedef
acpi_status(*acpi_repair_function) (struct acpi_evaluate_info * info,
				    union acpi_operand_object
				    **return_object_ptr);

typedef struct acpi_repair_info {
	char name[ACPI_NAME_SIZE];
	acpi_repair_function repair_function;

} acpi_repair_info;

/* Local prototypes */

static const struct acpi_repair_info *acpi_ns_match_complex_repair(struct
								   acpi_namespace_node
								   *node);

static acpi_status
acpi_ns_repair_ALR(struct acpi_evaluate_info *info,
		   union acpi_operand_object **return_object_ptr);

static acpi_status
acpi_ns_repair_CID(struct acpi_evaluate_info *info,
		   union acpi_operand_object **return_object_ptr);

static acpi_status
acpi_ns_repair_CST(struct acpi_evaluate_info *info,
		   union acpi_operand_object **return_object_ptr);

static acpi_status
acpi_ns_repair_FDE(struct acpi_evaluate_info *info,
		   union acpi_operand_object **return_object_ptr);

static acpi_status
acpi_ns_repair_HID(struct acpi_evaluate_info *info,
		   union acpi_operand_object **return_object_ptr);

static acpi_status
acpi_ns_repair_PRT(struct acpi_evaluate_info *info,
		   union acpi_operand_object **return_object_ptr);

static acpi_status
acpi_ns_repair_PSS(struct acpi_evaluate_info *info,
		   union acpi_operand_object **return_object_ptr);

static acpi_status
acpi_ns_repair_TSS(struct acpi_evaluate_info *info,
		   union acpi_operand_object **return_object_ptr);

static acpi_status
acpi_ns_check_sorted_list(struct acpi_evaluate_info *info,
			  union acpi_operand_object *return_object,
			  u32 start_index,
			  u32 expected_count,
			  u32 sort_index,
			  u8 sort_direction, char *sort_key_name);

/* Values for sort_direction above */

#define ACPI_SORT_ASCENDING     0
#define ACPI_SORT_DESCENDING    1

static void
acpi_ns_remove_element(union acpi_operand_object *obj_desc, u32 index);

static void
acpi_ns_sort_list(union acpi_operand_object **elements,
		  u32 count, u32 index, u8 sort_direction);

/*
 * This table contains the names of the predefined methods for which we can
 * perform more complex repairs.
 *
 * As necessary:
 *
 * _ALR: Sort the list ascending by ambient_illuminance
 * _CID: Strings: uppercase all, remove any leading asterisk
 * _CST: Sort the list ascending by C state type
 * _FDE: Convert Buffer of BYTEs to a Buffer of DWORDs
 * _GTM: Convert Buffer of BYTEs to a Buffer of DWORDs
 * _HID: Strings: uppercase all, remove any leading asterisk
 * _PRT: Fix reversed source_name and source_index
 * _PSS: Sort the list descending by Power
 * _TSS: Sort the list descending by Power
 *
 * Names that must be packages, but cannot be sorted:
 *
 * _BCL: Values are tied to the Package index where they appear, and cannot
 * be moved or sorted. These index values are used for _BQC and _BCM.
 * However, we can fix the case where a buffer is returned, by converting
 * it to a Package of integers.
 */
static const struct acpi_repair_info acpi_ns_repairable_names[] = {
	{"_ALR", acpi_ns_repair_ALR},
	{"_CID", acpi_ns_repair_CID},
	{"_CST", acpi_ns_repair_CST},
	{"_FDE", acpi_ns_repair_FDE},
	{"_GTM", acpi_ns_repair_FDE},	/* _GTM has same repair as _FDE */
	{"_HID", acpi_ns_repair_HID},
	{"_PRT", acpi_ns_repair_PRT},
	{"_PSS", acpi_ns_repair_PSS},
	{"_TSS", acpi_ns_repair_TSS},
	{{0, 0, 0, 0}, NULL}	/* Table terminator */
};

#define ACPI_FDE_FIELD_COUNT        5
#define ACPI_FDE_BYTE_BUFFER_SIZE   5
#define ACPI_FDE_DWORD_BUFFER_SIZE  (ACPI_FDE_FIELD_COUNT * sizeof (u32))

/******************************************************************************
 *
 * FUNCTION:    acpi_ns_complex_repairs
 *
 * PARAMETERS:  info                - Method execution information block
 *              node                - Namespace node for the method/object
 *              validate_status     - Original status of earlier validation
 *              return_object_ptr   - Pointer to the object returned from the
 *                                    evaluation of a method or object
 *
 * RETURN:      Status. AE_OK if repair was successful. If name is not
 *              matched, validate_status is returned.
 *
 * DESCRIPTION: Attempt to repair/convert a return object of a type that was
 *              not expected.
 *
 *****************************************************************************/

acpi_status
acpi_ns_complex_repairs(struct acpi_evaluate_info *info,
			struct acpi_namespace_node *node,
			acpi_status validate_status,
			union acpi_operand_object **return_object_ptr)
{
	const struct acpi_repair_info *predefined;
	acpi_status status;

	/* Check if this name is in the list of repairable names */

	predefined = acpi_ns_match_complex_repair(node);
	if (!predefined) {
		return (validate_status);
	}

	status = predefined->repair_function(info, return_object_ptr);
	return (status);
}

/******************************************************************************
 *
 * FUNCTION:    acpi_ns_match_complex_repair
 *
 * PARAMETERS:  node                - Namespace node for the method/object
 *
 * RETURN:      Pointer to entry in repair table. NULL indicates not found.
 *
 * DESCRIPTION: Check an object name against the repairable object list.
 *
 *****************************************************************************/

static const struct acpi_repair_info *acpi_ns_match_complex_repair(struct
								   acpi_namespace_node
								   *node)
{
	const struct acpi_repair_info *this_name;

	/* Search info table for a repairable predefined method/object name */

	this_name = acpi_ns_repairable_names;
	while (this_name->repair_function) {
		if (ACPI_COMPARE_NAME(node->name.ascii, this_name->name)) {
			return (this_name);
		}
		this_name++;
	}

	return (NULL);		/* Not found */
}

/******************************************************************************
 *
 * FUNCTION:    acpi_ns_repair_ALR
 *
 * PARAMETERS:  info                - Method execution information block
 *              return_object_ptr   - Pointer to the object returned from the
 *                                    evaluation of a method or object
 *
 * RETURN:      Status. AE_OK if object is OK or was repaired successfully
 *
 * DESCRIPTION: Repair for the _ALR object. If necessary, sort the object list
 *              ascending by the ambient illuminance values.
 *
 *****************************************************************************/

static acpi_status
acpi_ns_repair_ALR(struct acpi_evaluate_info *info,
		   union acpi_operand_object **return_object_ptr)
{
	union acpi_operand_object *return_object = *return_object_ptr;
	acpi_status status;

	status = acpi_ns_check_sorted_list(info, return_object, 0, 2, 1,
					   ACPI_SORT_ASCENDING,
					   "AmbientIlluminance");

	return (status);
}

/******************************************************************************
 *
 * FUNCTION:    acpi_ns_repair_FDE
 *
 * PARAMETERS:  info                - Method execution information block
 *              return_object_ptr   - Pointer to the object returned from the
 *                                    evaluation of a method or object
 *
 * RETURN:      Status. AE_OK if object is OK or was repaired successfully
 *
 * DESCRIPTION: Repair for the _FDE and _GTM objects. The expected return
 *              value is a Buffer of 5 DWORDs. This function repairs a common
 *              problem where the return value is a Buffer of BYTEs, not
 *              DWORDs.
 *
 *****************************************************************************/

static acpi_status
acpi_ns_repair_FDE(struct acpi_evaluate_info *info,
		   union acpi_operand_object **return_object_ptr)
{
	union acpi_operand_object *return_object = *return_object_ptr;
	union acpi_operand_object *buffer_object;
	u8 *byte_buffer;
	u32 *dword_buffer;
	u32 i;

	ACPI_FUNCTION_NAME(ns_repair_FDE);

	switch (return_object->common.type) {
	case ACPI_TYPE_BUFFER:

		/* This is the expected type. Length should be (at least) 5 DWORDs */

		if (return_object->buffer.length >= ACPI_FDE_DWORD_BUFFER_SIZE) {
			return (AE_OK);
		}

		/* We can only repair if we have exactly 5 BYTEs */

		if (return_object->buffer.length != ACPI_FDE_BYTE_BUFFER_SIZE) {
			ACPI_WARN_PREDEFINED((AE_INFO, info->full_pathname,
					      info->node_flags,
					      "Incorrect return buffer length %u, expected %u",
					      return_object->buffer.length,
					      ACPI_FDE_DWORD_BUFFER_SIZE));

			return (AE_AML_OPERAND_TYPE);
		}

		/* Create the new (larger) buffer object */

		buffer_object =
		    acpi_ut_create_buffer_object(ACPI_FDE_DWORD_BUFFER_SIZE);
		if (!buffer_object) {
			return (AE_NO_MEMORY);
		}

		/* Expand each byte to a DWORD */

		byte_buffer = return_object->buffer.pointer;
		dword_buffer =
		    ACPI_CAST_PTR(u32, buffer_object->buffer.pointer);

		for (i = 0; i < ACPI_FDE_FIELD_COUNT; i++) {
			*dword_buffer = (u32) *byte_buffer;
			dword_buffer++;
			byte_buffer++;
		}

		ACPI_DEBUG_PRINT((ACPI_DB_REPAIR,
				  "%s Expanded Byte Buffer to expected DWord Buffer\n",
				  info->full_pathname));
		break;

	default:

		return (AE_AML_OPERAND_TYPE);
	}

	/* Delete the original return object, return the new buffer object */

	acpi_ut_remove_reference(return_object);
	*return_object_ptr = buffer_object;

	info->return_flags |= ACPI_OBJECT_REPAIRED;
	return (AE_OK);
}

/******************************************************************************
 *
 * FUNCTION:    acpi_ns_repair_CID
 *
 * PARAMETERS:  info                - Method execution information block
 *              return_object_ptr   - Pointer to the object returned from the
 *                                    evaluation of a method or object
 *
 * RETURN:      Status. AE_OK if object is OK or was repaired successfully
 *
 * DESCRIPTION: Repair for the _CID object. If a string, ensure that all
 *              letters are uppercase and that there is no leading asterisk.
 *              If a Package, ensure same for all string elements.
 *
 *****************************************************************************/

static acpi_status
acpi_ns_repair_CID(struct acpi_evaluate_info *info,
		   union acpi_operand_object **return_object_ptr)
{
	acpi_status status;
	union acpi_operand_object *return_object = *return_object_ptr;
	union acpi_operand_object **element_ptr;
	union acpi_operand_object *original_element;
	u16 original_ref_count;
	u32 i;

	/* Check for _CID as a simple string */

	if (return_object->common.type == ACPI_TYPE_STRING) {
		status = acpi_ns_repair_HID(info, return_object_ptr);
		return (status);
	}

	/* Exit if not a Package */

	if (return_object->common.type != ACPI_TYPE_PACKAGE) {
		return (AE_OK);
	}

	/* Examine each element of the _CID package */

	element_ptr = return_object->package.elements;
	for (i = 0; i < return_object->package.count; i++) {
		original_element = *element_ptr;
		original_ref_count = original_element->common.reference_count;

		status = acpi_ns_repair_HID(info, element_ptr);
		if (ACPI_FAILURE(status)) {
			return (status);
		}

		/* Take care with reference counts */

		if (original_element != *element_ptr) {

			/* Element was replaced */

			(*element_ptr)->common.reference_count =
			    original_ref_count;

			acpi_ut_remove_reference(original_element);
		}

		element_ptr++;
	}

	return (AE_OK);
}

/******************************************************************************
 *
 * FUNCTION:    acpi_ns_repair_CST
 *
 * PARAMETERS:  info                - Method execution information block
 *              return_object_ptr   - Pointer to the object returned from the
 *                                    evaluation of a method or object
 *
 * RETURN:      Status. AE_OK if object is OK or was repaired successfully
 *
 * DESCRIPTION: Repair for the _CST object:
 *              1. Sort the list ascending by C state type
 *              2. Ensure type cannot be zero
 *              3. A sub-package count of zero means _CST is meaningless
 *              4. Count must match the number of C state sub-packages
 *
 *****************************************************************************/

static acpi_status
acpi_ns_repair_CST(struct acpi_evaluate_info *info,
		   union acpi_operand_object **return_object_ptr)
{
	union acpi_operand_object *return_object = *return_object_ptr;
	union acpi_operand_object **outer_elements;
	u32 outer_element_count;
	union acpi_operand_object *obj_desc;
	acpi_status status;
	u8 removing;
	u32 i;

	ACPI_FUNCTION_NAME(ns_repair_CST);

	/*
	 * Check if the C-state type values are proportional.
	 */
	outer_element_count = return_object->package.count - 1;
	i = 0;
	while (i < outer_element_count) {
		outer_elements = &return_object->package.elements[i + 1];
		removing = FALSE;

		if ((*outer_elements)->package.count == 0) {
			ACPI_WARN_PREDEFINED((AE_INFO, info->full_pathname,
					      info->node_flags,
					      "SubPackage[%u] - removing entry due to zero count",
					      i));
			removing = TRUE;
			goto remove_element;
		}

		obj_desc = (*outer_elements)->package.elements[1];	/* Index1 = Type */
		if ((u32)obj_desc->integer.value == 0) {
			ACPI_WARN_PREDEFINED((AE_INFO, info->full_pathname,
					      info->node_flags,
					      "SubPackage[%u] - removing entry due to invalid Type(0)",
					      i));
			removing = TRUE;
		}

	      remove_element:
		if (removing) {
			acpi_ns_remove_element(return_object, i + 1);
			outer_element_count--;
		} else {
			i++;
		}
	}

	/* Update top-level package count, Type "Integer" checked elsewhere */

	obj_desc = return_object->package.elements[0];
	obj_desc->integer.value = outer_element_count;

	/*
	 * Entries (subpackages) in the _CST Package must be sorted by the
	 * C-state type, in ascending order.
	 */
	status = acpi_ns_check_sorted_list(info, return_object, 1, 4, 1,
					   ACPI_SORT_ASCENDING, "C-State Type");
	if (ACPI_FAILURE(status)) {
		return (status);
	}

	return (AE_OK);
}

/******************************************************************************
 *
 * FUNCTION:    acpi_ns_repair_HID
 *
 * PARAMETERS:  info                - Method execution information block
 *              return_object_ptr   - Pointer to the object returned from the
 *                                    evaluation of a method or object
 *
 * RETURN:      Status. AE_OK if object is OK or was repaired successfully
 *
 * DESCRIPTION: Repair for the _HID object. If a string, ensure that all
 *              letters are uppercase and that there is no leading asterisk.
 *
 *****************************************************************************/

static acpi_status
acpi_ns_repair_HID(struct acpi_evaluate_info *info,
		   union acpi_operand_object **return_object_ptr)
{
	union acpi_operand_object *return_object = *return_object_ptr;
	union acpi_operand_object *new_string;
	char *source;
	char *dest;

	ACPI_FUNCTION_NAME(ns_repair_HID);

	/* We only care about string _HID objects (not integers) */

	if (return_object->common.type != ACPI_TYPE_STRING) {
		return (AE_OK);
	}

	if (return_object->string.length == 0) {
		ACPI_WARN_PREDEFINED((AE_INFO, info->full_pathname,
				      info->node_flags,
				      "Invalid zero-length _HID or _CID string"));

		/* Return AE_OK anyway, let driver handle it */

		info->return_flags |= ACPI_OBJECT_REPAIRED;
		return (AE_OK);
	}

	/* It is simplest to always create a new string object */

	new_string = acpi_ut_create_string_object(return_object->string.length);
	if (!new_string) {
		return (AE_NO_MEMORY);
	}

	/*
	 * Remove a leading asterisk if present. For some unknown reason, there
	 * are many machines in the field that contains IDs like this.
	 *
	 * Examples: "*PNP0C03", "*ACPI0003"
	 */
	source = return_object->string.pointer;
	if (*source == '*') {
		source++;
		new_string->string.length--;

		ACPI_DEBUG_PRINT((ACPI_DB_REPAIR,
				  "%s: Removed invalid leading asterisk\n",
				  info->full_pathname));
	}

	/*
	 * Copy and uppercase the string. From the ACPI 5.0 specification:
	 *
	 * A valid PNP ID must be of the form "AAA####" where A is an uppercase
	 * letter and # is a hex digit. A valid ACPI ID must be of the form
	 * "NNNN####" where N is an uppercase letter or decimal digit, and
	 * # is a hex digit.
	 */
	for (dest = new_string->string.pointer; *source; dest++, source++) {
		*dest = (char)ACPI_TOUPPER(*source);
	}

	acpi_ut_remove_reference(return_object);
	*return_object_ptr = new_string;
	return (AE_OK);
}

/******************************************************************************
 *
 * FUNCTION:    acpi_ns_repair_PRT
 *
 * PARAMETERS:  info                - Method execution information block
 *              return_object_ptr   - Pointer to the object returned from the
 *                                    evaluation of a method or object
 *
 * RETURN:      Status. AE_OK if object is OK or was repaired successfully
 *
 * DESCRIPTION: Repair for the _PRT object. If necessary, fix reversed
 *              source_name and source_index field, a common BIOS bug.
 *
 *****************************************************************************/

static acpi_status
acpi_ns_repair_PRT(struct acpi_evaluate_info *info,
		   union acpi_operand_object **return_object_ptr)
{
	union acpi_operand_object *package_object = *return_object_ptr;
	union acpi_operand_object **top_object_list;
	union acpi_operand_object **sub_object_list;
	union acpi_operand_object *obj_desc;
	u32 element_count;
	u32 index;

	/* Each element in the _PRT package is a subpackage */

	top_object_list = package_object->package.elements;
	element_count = package_object->package.count;

	for (index = 0; index < element_count; index++) {
		sub_object_list = (*top_object_list)->package.elements;

		/*
		 * If the BIOS has erroneously reversed the _PRT source_name (index 2)
		 * and the source_index (index 3), fix it. _PRT is important enough to
		 * workaround this BIOS error. This also provides compatibility with
		 * other ACPI implementations.
		 */
		obj_desc = sub_object_list[3];
		if (!obj_desc || (obj_desc->common.type != ACPI_TYPE_INTEGER)) {
			sub_object_list[3] = sub_object_list[2];
			sub_object_list[2] = obj_desc;
			info->return_flags |= ACPI_OBJECT_REPAIRED;

			ACPI_WARN_PREDEFINED((AE_INFO, info->full_pathname,
					      info->node_flags,
					      "PRT[%X]: Fixed reversed SourceName and SourceIndex",
					      index));
		}

		/* Point to the next union acpi_operand_object in the top level package */

		top_object_list++;
	}

	return (AE_OK);
}

/******************************************************************************
 *
 * FUNCTION:    acpi_ns_repair_PSS
 *
 * PARAMETERS:  info                - Method execution information block
 *              return_object_ptr   - Pointer to the object returned from the
 *                                    evaluation of a method or object
 *
 * RETURN:      Status. AE_OK if object is OK or was repaired successfully
 *
 * DESCRIPTION: Repair for the _PSS object. If necessary, sort the object list
 *              by the CPU frequencies. Check that the power dissipation values
 *              are all proportional to CPU frequency (i.e., sorting by
 *              frequency should be the same as sorting by power.)
 *
 *****************************************************************************/

static acpi_status
acpi_ns_repair_PSS(struct acpi_evaluate_info *info,
		   union acpi_operand_object **return_object_ptr)
{
	union acpi_operand_object *return_object = *return_object_ptr;
	union acpi_operand_object **outer_elements;
	u32 outer_element_count;
	union acpi_operand_object **elements;
	union acpi_operand_object *obj_desc;
	u32 previous_value;
	acpi_status status;
	u32 i;

	/*
	 * Entries (sub-packages) in the _PSS Package must be sorted by power
	 * dissipation, in descending order. If it appears that the list is
	 * incorrectly sorted, sort it. We sort by cpu_frequency, since this
	 * should be proportional to the power.
	 */
	status = acpi_ns_check_sorted_list(info, return_object, 0, 6, 0,
					   ACPI_SORT_DESCENDING,
					   "CpuFrequency");
	if (ACPI_FAILURE(status)) {
		return (status);
	}

	/*
	 * We now know the list is correctly sorted by CPU frequency. Check if
	 * the power dissipation values are proportional.
	 */
	previous_value = ACPI_UINT32_MAX;
	outer_elements = return_object->package.elements;
	outer_element_count = return_object->package.count;

	for (i = 0; i < outer_element_count; i++) {
		elements = (*outer_elements)->package.elements;
		obj_desc = elements[1];	/* Index1 = power_dissipation */

		if ((u32) obj_desc->integer.value > previous_value) {
			ACPI_WARN_PREDEFINED((AE_INFO, info->full_pathname,
					      info->node_flags,
					      "SubPackage[%u,%u] - suspicious power dissipation values",
					      i - 1, i));
		}

		previous_value = (u32) obj_desc->integer.value;
		outer_elements++;
	}

	return (AE_OK);
}

/******************************************************************************
 *
 * FUNCTION:    acpi_ns_repair_TSS
 *
 * PARAMETERS:  info                - Method execution information block
 *              return_object_ptr   - Pointer to the object returned from the
 *                                    evaluation of a method or object
 *
 * RETURN:      Status. AE_OK if object is OK or was repaired successfully
 *
 * DESCRIPTION: Repair for the _TSS object. If necessary, sort the object list
 *              descending by the power dissipation values.
 *
 *****************************************************************************/

static acpi_status
acpi_ns_repair_TSS(struct acpi_evaluate_info *info,
		   union acpi_operand_object **return_object_ptr)
{
	union acpi_operand_object *return_object = *return_object_ptr;
	acpi_status status;
	struct acpi_namespace_node *node;

	/*
	 * We can only sort the _TSS return package if there is no _PSS in the
	 * same scope. This is because if _PSS is present, the ACPI specification
	 * dictates that the _TSS Power Dissipation field is to be ignored, and
	 * therefore some BIOSs leave garbage values in the _TSS Power field(s).
	 * In this case, it is best to just return the _TSS package as-is.
	 * (May, 2011)
	 */
	status = acpi_ns_get_node(info->node, "^_PSS",
				  ACPI_NS_NO_UPSEARCH, &node);
	if (ACPI_SUCCESS(status)) {
		return (AE_OK);
	}

	status = acpi_ns_check_sorted_list(info, return_object, 0, 5, 1,
					   ACPI_SORT_DESCENDING,
					   "PowerDissipation");

	return (status);
}

/******************************************************************************
 *
 * FUNCTION:    acpi_ns_check_sorted_list
 *
 * PARAMETERS:  info                - Method execution information block
 *              return_object       - Pointer to the top-level returned object
 *              start_index         - Index of the first sub-package
 *              expected_count      - Minimum length of each sub-package
 *              sort_index          - Sub-package entry to sort on
 *              sort_direction      - Ascending or descending
 *              sort_key_name       - Name of the sort_index field
 *
 * RETURN:      Status. AE_OK if the list is valid and is sorted correctly or
 *              has been repaired by sorting the list.
 *
 * DESCRIPTION: Check if the package list is valid and sorted correctly by the
 *              sort_index. If not, then sort the list.
 *
 *****************************************************************************/

static acpi_status
acpi_ns_check_sorted_list(struct acpi_evaluate_info *info,
			  union acpi_operand_object *return_object,
			  u32 start_index,
			  u32 expected_count,
			  u32 sort_index,
			  u8 sort_direction, char *sort_key_name)
{
	u32 outer_element_count;
	union acpi_operand_object **outer_elements;
	union acpi_operand_object **elements;
	union acpi_operand_object *obj_desc;
	u32 i;
	u32 previous_value;

	ACPI_FUNCTION_NAME(ns_check_sorted_list);

	/* The top-level object must be a package */

	if (return_object->common.type != ACPI_TYPE_PACKAGE) {
		return (AE_AML_OPERAND_TYPE);
	}

	/*
	 * NOTE: assumes list of sub-packages contains no NULL elements.
	 * Any NULL elements should have been removed by earlier call
	 * to acpi_ns_remove_null_elements.
	 */
	outer_element_count = return_object->package.count;
	if (!outer_element_count || start_index >= outer_element_count) {
		return (AE_AML_PACKAGE_LIMIT);
	}

	outer_elements = &return_object->package.elements[start_index];
	outer_element_count -= start_index;

	previous_value = 0;
	if (sort_direction == ACPI_SORT_DESCENDING) {
		previous_value = ACPI_UINT32_MAX;
	}

	/* Examine each subpackage */

	for (i = 0; i < outer_element_count; i++) {

		/* Each element of the top-level package must also be a package */

		if ((*outer_elements)->common.type != ACPI_TYPE_PACKAGE) {
			return (AE_AML_OPERAND_TYPE);
		}

		/* Each sub-package must have the minimum length */

		if ((*outer_elements)->package.count < expected_count) {
			return (AE_AML_PACKAGE_LIMIT);
		}

		elements = (*outer_elements)->package.elements;
		obj_desc = elements[sort_index];

		if (obj_desc->common.type != ACPI_TYPE_INTEGER) {
			return (AE_AML_OPERAND_TYPE);
		}

		/*
		 * The list must be sorted in the specified order. If we detect a
		 * discrepancy, sort the entire list.
		 */
		if (((sort_direction == ACPI_SORT_ASCENDING) &&
		     (obj_desc->integer.value < previous_value)) ||
		    ((sort_direction == ACPI_SORT_DESCENDING) &&
		     (obj_desc->integer.value > previous_value))) {
			acpi_ns_sort_list(&return_object->package.
					  elements[start_index],
					  outer_element_count, sort_index,
					  sort_direction);

			info->return_flags |= ACPI_OBJECT_REPAIRED;

			ACPI_DEBUG_PRINT((ACPI_DB_REPAIR,
					  "%s: Repaired unsorted list - now sorted by %s\n",
					  info->full_pathname, sort_key_name));
			return (AE_OK);
		}

		previous_value = (u32) obj_desc->integer.value;
		outer_elements++;
	}

	return (AE_OK);
}

/******************************************************************************
 *
 * FUNCTION:    acpi_ns_sort_list
 *
 * PARAMETERS:  elements            - Package object element list
 *              count               - Element count for above
 *              index               - Sort by which package element
 *              sort_direction      - Ascending or Descending sort
 *
 * RETURN:      None
 *
 * DESCRIPTION: Sort the objects that are in a package element list.
 *
 * NOTE: Assumes that all NULL elements have been removed from the package,
 *       and that all elements have been verified to be of type Integer.
 *
 *****************************************************************************/

static void
acpi_ns_sort_list(union acpi_operand_object **elements,
		  u32 count, u32 index, u8 sort_direction)
{
	union acpi_operand_object *obj_desc1;
	union acpi_operand_object *obj_desc2;
	union acpi_operand_object *temp_obj;
	u32 i;
	u32 j;

	/* Simple bubble sort */

	for (i = 1; i < count; i++) {
		for (j = (count - 1); j >= i; j--) {
			obj_desc1 = elements[j - 1]->package.elements[index];
			obj_desc2 = elements[j]->package.elements[index];

			if (((sort_direction == ACPI_SORT_ASCENDING) &&
			     (obj_desc1->integer.value >
			      obj_desc2->integer.value))
			    || ((sort_direction == ACPI_SORT_DESCENDING)
				&& (obj_desc1->integer.value <
				    obj_desc2->integer.value))) {
				temp_obj = elements[j - 1];
				elements[j - 1] = elements[j];
				elements[j] = temp_obj;
			}
		}
	}
}

/******************************************************************************
 *
 * FUNCTION:    acpi_ns_remove_element
 *
 * PARAMETERS:  obj_desc            - Package object element list
 *              index               - Index of element to remove
 *
 * RETURN:      None
 *
 * DESCRIPTION: Remove the requested element of a package and delete it.
 *
 *****************************************************************************/

static void
acpi_ns_remove_element(union acpi_operand_object *obj_desc, u32 index)
{
	union acpi_operand_object **source;
	union acpi_operand_object **dest;
	u32 count;
	u32 new_count;
	u32 i;

	ACPI_FUNCTION_NAME(ns_remove_element);

	count = obj_desc->package.count;
	new_count = count - 1;

	source = obj_desc->package.elements;
	dest = source;

	/* Examine all elements of the package object, remove matched index */

	for (i = 0; i < count; i++) {
		if (i == index) {
			acpi_ut_remove_reference(*source);	/* Remove one ref for being in pkg */
			acpi_ut_remove_reference(*source);
		} else {
			*dest = *source;
			dest++;
		}
		source++;
	}

	/* NULL terminate list and update the package count */

	*dest = NULL;
	obj_desc->package.count = new_count;
}