summaryrefslogtreecommitdiffstats
path: root/drivers/acpi/acpica/dbtest.c
blob: 56e446b89d18b74e8dd06b152a99d507f1a80c39 (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
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
/*******************************************************************************
 *
 * Module Name: dbtest - Various debug-related tests
 *
 ******************************************************************************/

/*
 * Copyright (C) 2000 - 2018, 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 "acdebug.h"
#include "acnamesp.h"
#include "acpredef.h"

#define _COMPONENT          ACPI_CA_DEBUGGER
ACPI_MODULE_NAME("dbtest")

/* Local prototypes */
static void acpi_db_test_all_objects(void);

static acpi_status
acpi_db_test_one_object(acpi_handle obj_handle,
			u32 nesting_level, void *context, void **return_value);

static acpi_status
acpi_db_test_integer_type(struct acpi_namespace_node *node, u32 bit_length);

static acpi_status
acpi_db_test_buffer_type(struct acpi_namespace_node *node, u32 bit_length);

static acpi_status
acpi_db_test_string_type(struct acpi_namespace_node *node, u32 byte_length);

static acpi_status
acpi_db_read_from_object(struct acpi_namespace_node *node,
			 acpi_object_type expected_type,
			 union acpi_object **value);

static acpi_status
acpi_db_write_to_object(struct acpi_namespace_node *node,
			union acpi_object *value);

static void acpi_db_evaluate_all_predefined_names(char *count_arg);

static acpi_status
acpi_db_evaluate_one_predefined_name(acpi_handle obj_handle,
				     u32 nesting_level,
				     void *context, void **return_value);

/*
 * Test subcommands
 */
static struct acpi_db_argument_info acpi_db_test_types[] = {
	{"OBJECTS"},
	{"PREDEFINED"},
	{NULL}			/* Must be null terminated */
};

#define CMD_TEST_OBJECTS        0
#define CMD_TEST_PREDEFINED     1

#define BUFFER_FILL_VALUE       0xFF

/*
 * Support for the special debugger read/write control methods.
 * These methods are installed into the current namespace and are
 * used to read and write the various namespace objects. The point
 * is to force the AML interpreter do all of the work.
 */
#define ACPI_DB_READ_METHOD     "\\_T98"
#define ACPI_DB_WRITE_METHOD    "\\_T99"

static acpi_handle read_handle = NULL;
static acpi_handle write_handle = NULL;

/* ASL Definitions of the debugger read/write control methods */

#if 0
definition_block("ssdt.aml", "SSDT", 2, "Intel", "DEBUG", 0x00000001)
{
	method(_T98, 1, not_serialized) {	/* Read */
		return (de_ref_of(arg0))
	}
}

definition_block("ssdt2.aml", "SSDT", 2, "Intel", "DEBUG", 0x00000001)
{
	method(_T99, 2, not_serialized) {	/* Write */
		store(arg1, arg0)
	}
}
#endif

static unsigned char read_method_code[] = {
	0x53, 0x53, 0x44, 0x54, 0x2E, 0x00, 0x00, 0x00,	/* 00000000    "SSDT...." */
	0x02, 0xC9, 0x49, 0x6E, 0x74, 0x65, 0x6C, 0x00,	/* 00000008    "..Intel." */
	0x44, 0x45, 0x42, 0x55, 0x47, 0x00, 0x00, 0x00,	/* 00000010    "DEBUG..." */
	0x01, 0x00, 0x00, 0x00, 0x49, 0x4E, 0x54, 0x4C,	/* 00000018    "....INTL" */
	0x18, 0x12, 0x13, 0x20, 0x14, 0x09, 0x5F, 0x54,	/* 00000020    "... .._T" */
	0x39, 0x38, 0x01, 0xA4, 0x83, 0x68	/* 00000028    "98...h"   */
};

static unsigned char write_method_code[] = {
	0x53, 0x53, 0x44, 0x54, 0x2E, 0x00, 0x00, 0x00,	/* 00000000    "SSDT...." */
	0x02, 0x15, 0x49, 0x6E, 0x74, 0x65, 0x6C, 0x00,	/* 00000008    "..Intel." */
	0x44, 0x45, 0x42, 0x55, 0x47, 0x00, 0x00, 0x00,	/* 00000010    "DEBUG..." */
	0x01, 0x00, 0x00, 0x00, 0x49, 0x4E, 0x54, 0x4C,	/* 00000018    "....INTL" */
	0x18, 0x12, 0x13, 0x20, 0x14, 0x09, 0x5F, 0x54,	/* 00000020    "... .._T" */
	0x39, 0x39, 0x02, 0x70, 0x69, 0x68	/* 00000028    "99.pih"   */
};

/*******************************************************************************
 *
 * FUNCTION:    acpi_db_execute_test
 *
 * PARAMETERS:  type_arg        - Subcommand
 *
 * RETURN:      None
 *
 * DESCRIPTION: Execute various debug tests.
 *
 * Note: Code is prepared for future expansion of the TEST command.
 *
 ******************************************************************************/

void acpi_db_execute_test(char *type_arg)
{
	u32 temp;

	acpi_ut_strupr(type_arg);
	temp = acpi_db_match_argument(type_arg, acpi_db_test_types);
	if (temp == ACPI_TYPE_NOT_FOUND) {
		acpi_os_printf("Invalid or unsupported argument\n");
		return;
	}

	switch (temp) {
	case CMD_TEST_OBJECTS:

		acpi_db_test_all_objects();
		break;

	case CMD_TEST_PREDEFINED:

		acpi_db_evaluate_all_predefined_names(NULL);
		break;

	default:
		break;
	}
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_db_test_all_objects
 *
 * PARAMETERS:  None
 *
 * RETURN:      None
 *
 * DESCRIPTION: This test implements the OBJECTS subcommand. It exercises the
 *              namespace by reading/writing/comparing all data objects such
 *              as integers, strings, buffers, fields, buffer fields, etc.
 *
 ******************************************************************************/

static void acpi_db_test_all_objects(void)
{
	acpi_status status;

	/* Install the debugger read-object control method if necessary */

	if (!read_handle) {
		status = acpi_install_method(read_method_code);
		if (ACPI_FAILURE(status)) {
			acpi_os_printf
			    ("%s, Could not install debugger read method\n",
			     acpi_format_exception(status));
			return;
		}

		status =
		    acpi_get_handle(NULL, ACPI_DB_READ_METHOD, &read_handle);
		if (ACPI_FAILURE(status)) {
			acpi_os_printf
			    ("Could not obtain handle for debug method %s\n",
			     ACPI_DB_READ_METHOD);
			return;
		}
	}

	/* Install the debugger write-object control method if necessary */

	if (!write_handle) {
		status = acpi_install_method(write_method_code);
		if (ACPI_FAILURE(status)) {
			acpi_os_printf
			    ("%s, Could not install debugger write method\n",
			     acpi_format_exception(status));
			return;
		}

		status =
		    acpi_get_handle(NULL, ACPI_DB_WRITE_METHOD, &write_handle);
		if (ACPI_FAILURE(status)) {
			acpi_os_printf
			    ("Could not obtain handle for debug method %s\n",
			     ACPI_DB_WRITE_METHOD);
			return;
		}
	}

	/* Walk the entire namespace, testing each supported named data object */

	(void)acpi_walk_namespace(ACPI_TYPE_ANY, ACPI_ROOT_OBJECT,
				  ACPI_UINT32_MAX, acpi_db_test_one_object,
				  NULL, NULL, NULL);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_db_test_one_object
 *
 * PARAMETERS:  acpi_walk_callback
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Test one namespace object. Supported types are Integer,
 *              String, Buffer, buffer_field, and field_unit. All other object
 *              types are simply ignored.
 *
 *              Note: Support for Packages is not implemented.
 *
 ******************************************************************************/

static acpi_status
acpi_db_test_one_object(acpi_handle obj_handle,
			u32 nesting_level, void *context, void **return_value)
{
	struct acpi_namespace_node *node;
	union acpi_operand_object *obj_desc;
	union acpi_operand_object *region_obj;
	acpi_object_type local_type;
	u32 bit_length = 0;
	u32 byte_length = 0;
	acpi_status status = AE_OK;

	node = ACPI_CAST_PTR(struct acpi_namespace_node, obj_handle);
	obj_desc = node->object;

	/*
	 * For the supported types, get the actual bit length or
	 * byte length. Map the type to one of Integer/String/Buffer.
	 */
	switch (node->type) {
	case ACPI_TYPE_INTEGER:

		/* Integer width is either 32 or 64 */

		local_type = ACPI_TYPE_INTEGER;
		bit_length = acpi_gbl_integer_bit_width;
		break;

	case ACPI_TYPE_STRING:

		local_type = ACPI_TYPE_STRING;
		byte_length = obj_desc->string.length;
		break;

	case ACPI_TYPE_BUFFER:

		local_type = ACPI_TYPE_BUFFER;
		byte_length = obj_desc->buffer.length;
		bit_length = byte_length * 8;
		break;

	case ACPI_TYPE_FIELD_UNIT:
	case ACPI_TYPE_BUFFER_FIELD:
	case ACPI_TYPE_LOCAL_REGION_FIELD:
	case ACPI_TYPE_LOCAL_INDEX_FIELD:
	case ACPI_TYPE_LOCAL_BANK_FIELD:

		local_type = ACPI_TYPE_INTEGER;
		if (obj_desc) {
			/*
			 * Returned object will be a Buffer if the field length
			 * is larger than the size of an Integer (32 or 64 bits
			 * depending on the DSDT version).
			 */
			bit_length = obj_desc->common_field.bit_length;
			byte_length = ACPI_ROUND_BITS_UP_TO_BYTES(bit_length);
			if (bit_length > acpi_gbl_integer_bit_width) {
				local_type = ACPI_TYPE_BUFFER;
			}
		}
		break;

	default:

		/* Ignore all other types */

		return (AE_OK);
	}

	/* Emit the common prefix: Type:Name */

	acpi_os_printf("%14s: %4.4s",
		       acpi_ut_get_type_name(node->type), node->name.ascii);
	if (!obj_desc) {
		acpi_os_printf(" Ignoring, no attached object\n");
		return (AE_OK);
	}

	/*
	 * Check for unsupported region types. Note: acpi_exec simulates
	 * access to system_memory, system_IO, PCI_Config, and EC.
	 */
	switch (node->type) {
	case ACPI_TYPE_LOCAL_REGION_FIELD:

		region_obj = obj_desc->field.region_obj;
		switch (region_obj->region.space_id) {
		case ACPI_ADR_SPACE_SYSTEM_MEMORY:
		case ACPI_ADR_SPACE_SYSTEM_IO:
		case ACPI_ADR_SPACE_PCI_CONFIG:
		case ACPI_ADR_SPACE_EC:

			break;

		default:

			acpi_os_printf
			    ("    %s space is not supported [%4.4s]\n",
			     acpi_ut_get_region_name(region_obj->region.
						     space_id),
			     region_obj->region.node->name.ascii);
			return (AE_OK);
		}
		break;

	default:
		break;
	}

	/* At this point, we have resolved the object to one of the major types */

	switch (local_type) {
	case ACPI_TYPE_INTEGER:

		status = acpi_db_test_integer_type(node, bit_length);
		break;

	case ACPI_TYPE_STRING:

		status = acpi_db_test_string_type(node, byte_length);
		break;

	case ACPI_TYPE_BUFFER:

		status = acpi_db_test_buffer_type(node, bit_length);
		break;

	default:

		acpi_os_printf(" Ignoring, type not implemented (%2.2X)",
			       local_type);
		break;
	}

	switch (node->type) {
	case ACPI_TYPE_LOCAL_REGION_FIELD:

		region_obj = obj_desc->field.region_obj;
		acpi_os_printf(" (%s)",
			       acpi_ut_get_region_name(region_obj->region.
						       space_id));
		break;

	default:
		break;
	}

	acpi_os_printf("\n");
	return (status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_db_test_integer_type
 *
 * PARAMETERS:  node                - Parent NS node for the object
 *              bit_length          - Actual length of the object. Used for
 *                                    support of arbitrary length field_unit
 *                                    and buffer_field objects.
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Test read/write for an Integer-valued object. Performs a
 *              write/read/compare of an arbitrary new value, then performs
 *              a write/read/compare of the original value.
 *
 ******************************************************************************/

static acpi_status
acpi_db_test_integer_type(struct acpi_namespace_node *node, u32 bit_length)
{
	union acpi_object *temp1 = NULL;
	union acpi_object *temp2 = NULL;
	union acpi_object *temp3 = NULL;
	union acpi_object write_value;
	u64 value_to_write;
	acpi_status status;

	if (bit_length > 64) {
		acpi_os_printf(" Invalid length for an Integer: %u",
			       bit_length);
		return (AE_OK);
	}

	/* Read the original value */

	status = acpi_db_read_from_object(node, ACPI_TYPE_INTEGER, &temp1);
	if (ACPI_FAILURE(status)) {
		return (status);
	}

	acpi_os_printf(" (%4.4X/%3.3X) %8.8X%8.8X",
		       bit_length, ACPI_ROUND_BITS_UP_TO_BYTES(bit_length),
		       ACPI_FORMAT_UINT64(temp1->integer.value));

	value_to_write = ACPI_UINT64_MAX >> (64 - bit_length);
	if (temp1->integer.value == value_to_write) {
		value_to_write = 0;
	}

	/* Write a new value */

	write_value.type = ACPI_TYPE_INTEGER;
	write_value.integer.value = value_to_write;
	status = acpi_db_write_to_object(node, &write_value);
	if (ACPI_FAILURE(status)) {
		goto exit;
	}

	/* Ensure that we can read back the new value */

	status = acpi_db_read_from_object(node, ACPI_TYPE_INTEGER, &temp2);
	if (ACPI_FAILURE(status)) {
		goto exit;
	}

	if (temp2->integer.value != value_to_write) {
		acpi_os_printf(" MISMATCH 2: %8.8X%8.8X, expecting %8.8X%8.8X",
			       ACPI_FORMAT_UINT64(temp2->integer.value),
			       ACPI_FORMAT_UINT64(value_to_write));
	}

	/* Write back the original value */

	write_value.integer.value = temp1->integer.value;
	status = acpi_db_write_to_object(node, &write_value);
	if (ACPI_FAILURE(status)) {
		goto exit;
	}

	/* Ensure that we can read back the original value */

	status = acpi_db_read_from_object(node, ACPI_TYPE_INTEGER, &temp3);
	if (ACPI_FAILURE(status)) {
		goto exit;
	}

	if (temp3->integer.value != temp1->integer.value) {
		acpi_os_printf(" MISMATCH 3: %8.8X%8.8X, expecting %8.8X%8.8X",
			       ACPI_FORMAT_UINT64(temp3->integer.value),
			       ACPI_FORMAT_UINT64(temp1->integer.value));
	}

exit:
	if (temp1) {
		acpi_os_free(temp1);
	}
	if (temp2) {
		acpi_os_free(temp2);
	}
	if (temp3) {
		acpi_os_free(temp3);
	}
	return (AE_OK);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_db_test_buffer_type
 *
 * PARAMETERS:  node                - Parent NS node for the object
 *              bit_length          - Actual length of the object.
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Test read/write for an Buffer-valued object. Performs a
 *              write/read/compare of an arbitrary new value, then performs
 *              a write/read/compare of the original value.
 *
 ******************************************************************************/

static acpi_status
acpi_db_test_buffer_type(struct acpi_namespace_node *node, u32 bit_length)
{
	union acpi_object *temp1 = NULL;
	union acpi_object *temp2 = NULL;
	union acpi_object *temp3 = NULL;
	u8 *buffer;
	union acpi_object write_value;
	acpi_status status;
	u32 byte_length;
	u32 i;
	u8 extra_bits;

	byte_length = ACPI_ROUND_BITS_UP_TO_BYTES(bit_length);
	if (byte_length == 0) {
		acpi_os_printf(" Ignoring zero length buffer");
		return (AE_OK);
	}

	/* Allocate a local buffer */

	buffer = ACPI_ALLOCATE_ZEROED(byte_length);
	if (!buffer) {
		return (AE_NO_MEMORY);
	}

	/* Read the original value */

	status = acpi_db_read_from_object(node, ACPI_TYPE_BUFFER, &temp1);
	if (ACPI_FAILURE(status)) {
		goto exit;
	}

	/* Emit a few bytes of the buffer */

	acpi_os_printf(" (%4.4X/%3.3X)", bit_length, temp1->buffer.length);
	for (i = 0; ((i < 4) && (i < byte_length)); i++) {
		acpi_os_printf(" %2.2X", temp1->buffer.pointer[i]);
	}
	acpi_os_printf("... ");

	/*
	 * Write a new value.
	 *
	 * Handle possible extra bits at the end of the buffer. Can
	 * happen for field_units larger than an integer, but the bit
	 * count is not an integral number of bytes. Zero out the
	 * unused bits.
	 */
	memset(buffer, BUFFER_FILL_VALUE, byte_length);
	extra_bits = bit_length % 8;
	if (extra_bits) {
		buffer[byte_length - 1] = ACPI_MASK_BITS_ABOVE(extra_bits);
	}

	write_value.type = ACPI_TYPE_BUFFER;
	write_value.buffer.length = byte_length;
	write_value.buffer.pointer = buffer;

	status = acpi_db_write_to_object(node, &write_value);
	if (ACPI_FAILURE(status)) {
		goto exit;
	}

	/* Ensure that we can read back the new value */

	status = acpi_db_read_from_object(node, ACPI_TYPE_BUFFER, &temp2);
	if (ACPI_FAILURE(status)) {
		goto exit;
	}

	if (memcmp(temp2->buffer.pointer, buffer, byte_length)) {
		acpi_os_printf(" MISMATCH 2: New buffer value");
	}

	/* Write back the original value */

	write_value.buffer.length = byte_length;
	write_value.buffer.pointer = temp1->buffer.pointer;

	status = acpi_db_write_to_object(node, &write_value);
	if (ACPI_FAILURE(status)) {
		goto exit;
	}

	/* Ensure that we can read back the original value */

	status = acpi_db_read_from_object(node, ACPI_TYPE_BUFFER, &temp3);
	if (ACPI_FAILURE(status)) {
		goto exit;
	}

	if (memcmp(temp1->buffer.pointer, temp3->buffer.pointer, byte_length)) {
		acpi_os_printf(" MISMATCH 3: While restoring original buffer");
	}

exit:
	ACPI_FREE(buffer);
	if (temp1) {
		acpi_os_free(temp1);
	}
	if (temp2) {
		acpi_os_free(temp2);
	}
	if (temp3) {
		acpi_os_free(temp3);
	}
	return (status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_db_test_string_type
 *
 * PARAMETERS:  node                - Parent NS node for the object
 *              byte_length         - Actual length of the object.
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Test read/write for an String-valued object. Performs a
 *              write/read/compare of an arbitrary new value, then performs
 *              a write/read/compare of the original value.
 *
 ******************************************************************************/

static acpi_status
acpi_db_test_string_type(struct acpi_namespace_node *node, u32 byte_length)
{
	union acpi_object *temp1 = NULL;
	union acpi_object *temp2 = NULL;
	union acpi_object *temp3 = NULL;
	char *value_to_write = "Test String from AML Debugger";
	union acpi_object write_value;
	acpi_status status;

	/* Read the original value */

	status = acpi_db_read_from_object(node, ACPI_TYPE_STRING, &temp1);
	if (ACPI_FAILURE(status)) {
		return (status);
	}

	acpi_os_printf(" (%4.4X/%3.3X) \"%s\"", (temp1->string.length * 8),
		       temp1->string.length, temp1->string.pointer);

	/* Write a new value */

	write_value.type = ACPI_TYPE_STRING;
	write_value.string.length = strlen(value_to_write);
	write_value.string.pointer = value_to_write;

	status = acpi_db_write_to_object(node, &write_value);
	if (ACPI_FAILURE(status)) {
		goto exit;
	}

	/* Ensure that we can read back the new value */

	status = acpi_db_read_from_object(node, ACPI_TYPE_STRING, &temp2);
	if (ACPI_FAILURE(status)) {
		goto exit;
	}

	if (strcmp(temp2->string.pointer, value_to_write)) {
		acpi_os_printf(" MISMATCH 2: %s, expecting %s",
			       temp2->string.pointer, value_to_write);
	}

	/* Write back the original value */

	write_value.string.length = strlen(temp1->string.pointer);
	write_value.string.pointer = temp1->string.pointer;

	status = acpi_db_write_to_object(node, &write_value);
	if (ACPI_FAILURE(status)) {
		goto exit;
	}

	/* Ensure that we can read back the original value */

	status = acpi_db_read_from_object(node, ACPI_TYPE_STRING, &temp3);
	if (ACPI_FAILURE(status)) {
		goto exit;
	}

	if (strcmp(temp1->string.pointer, temp3->string.pointer)) {
		acpi_os_printf(" MISMATCH 3: %s, expecting %s",
			       temp3->string.pointer, temp1->string.pointer);
	}

exit:
	if (temp1) {
		acpi_os_free(temp1);
	}
	if (temp2) {
		acpi_os_free(temp2);
	}
	if (temp3) {
		acpi_os_free(temp3);
	}
	return (status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_db_read_from_object
 *
 * PARAMETERS:  node                - Parent NS node for the object
 *              expected_type       - Object type expected from the read
 *              value               - Where the value read is returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Performs a read from the specified object by invoking the
 *              special debugger control method that reads the object. Thus,
 *              the AML interpreter is doing all of the work, increasing the
 *              validity of the test.
 *
 ******************************************************************************/

static acpi_status
acpi_db_read_from_object(struct acpi_namespace_node *node,
			 acpi_object_type expected_type,
			 union acpi_object **value)
{
	union acpi_object *ret_value;
	struct acpi_object_list param_objects;
	union acpi_object params[2];
	struct acpi_buffer return_obj;
	acpi_status status;

	params[0].type = ACPI_TYPE_LOCAL_REFERENCE;
	params[0].reference.actual_type = node->type;
	params[0].reference.handle = ACPI_CAST_PTR(acpi_handle, node);

	param_objects.count = 1;
	param_objects.pointer = params;

	return_obj.length = ACPI_ALLOCATE_BUFFER;

	acpi_gbl_method_executing = TRUE;
	status = acpi_evaluate_object(read_handle, NULL,
				      &param_objects, &return_obj);
	acpi_gbl_method_executing = FALSE;

	if (ACPI_FAILURE(status)) {
		acpi_os_printf("Could not read from object, %s",
			       acpi_format_exception(status));
		return (status);
	}

	ret_value = (union acpi_object *)return_obj.pointer;

	switch (ret_value->type) {
	case ACPI_TYPE_INTEGER:
	case ACPI_TYPE_BUFFER:
	case ACPI_TYPE_STRING:
		/*
		 * Did we receive the type we wanted? Most important for the
		 * Integer/Buffer case (when a field is larger than an Integer,
		 * it should return a Buffer).
		 */
		if (ret_value->type != expected_type) {
			acpi_os_printf
			    (" Type mismatch: Expected %s, Received %s",
			     acpi_ut_get_type_name(expected_type),
			     acpi_ut_get_type_name(ret_value->type));

			return (AE_TYPE);
		}

		*value = ret_value;
		break;

	default:

		acpi_os_printf(" Unsupported return object type, %s",
			       acpi_ut_get_type_name(ret_value->type));

		acpi_os_free(return_obj.pointer);
		return (AE_TYPE);
	}

	return (status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_db_write_to_object
 *
 * PARAMETERS:  node                - Parent NS node for the object
 *              value               - Value to be written
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Performs a write to the specified object by invoking the
 *              special debugger control method that writes the object. Thus,
 *              the AML interpreter is doing all of the work, increasing the
 *              validity of the test.
 *
 ******************************************************************************/

static acpi_status
acpi_db_write_to_object(struct acpi_namespace_node *node,
			union acpi_object *value)
{
	struct acpi_object_list param_objects;
	union acpi_object params[2];
	acpi_status status;

	params[0].type = ACPI_TYPE_LOCAL_REFERENCE;
	params[0].reference.actual_type = node->type;
	params[0].reference.handle = ACPI_CAST_PTR(acpi_handle, node);

	/* Copy the incoming user parameter */

	memcpy(&params[1], value, sizeof(union acpi_object));

	param_objects.count = 2;
	param_objects.pointer = params;

	acpi_gbl_method_executing = TRUE;
	status = acpi_evaluate_object(write_handle, NULL, &param_objects, NULL);
	acpi_gbl_method_executing = FALSE;

	if (ACPI_FAILURE(status)) {
		acpi_os_printf("Could not write to object, %s",
			       acpi_format_exception(status));
	}

	return (status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_db_evaluate_all_predefined_names
 *
 * PARAMETERS:  count_arg           - Max number of methods to execute
 *
 * RETURN:      None
 *
 * DESCRIPTION: Namespace batch execution. Execute predefined names in the
 *              namespace, up to the max count, if specified.
 *
 ******************************************************************************/

static void acpi_db_evaluate_all_predefined_names(char *count_arg)
{
	struct acpi_db_execute_walk info;

	info.count = 0;
	info.max_count = ACPI_UINT32_MAX;

	if (count_arg) {
		info.max_count = strtoul(count_arg, NULL, 0);
	}

	/* Search all nodes in namespace */

	(void)acpi_walk_namespace(ACPI_TYPE_ANY, ACPI_ROOT_OBJECT,
				  ACPI_UINT32_MAX,
				  acpi_db_evaluate_one_predefined_name, NULL,
				  (void *)&info, NULL);

	acpi_os_printf("Evaluated %u predefined names in the namespace\n",
		       info.count);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_db_evaluate_one_predefined_name
 *
 * PARAMETERS:  Callback from walk_namespace
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Batch execution module. Currently only executes predefined
 *              ACPI names.
 *
 ******************************************************************************/

static acpi_status
acpi_db_evaluate_one_predefined_name(acpi_handle obj_handle,
				     u32 nesting_level,
				     void *context, void **return_value)
{
	struct acpi_namespace_node *node =
	    (struct acpi_namespace_node *)obj_handle;
	struct acpi_db_execute_walk *info =
	    (struct acpi_db_execute_walk *)context;
	char *pathname;
	const union acpi_predefined_info *predefined;
	struct acpi_device_info *obj_info;
	struct acpi_object_list param_objects;
	union acpi_object params[ACPI_METHOD_NUM_ARGS];
	union acpi_object *this_param;
	struct acpi_buffer return_obj;
	acpi_status status;
	u16 arg_type_list;
	u8 arg_count;
	u8 arg_type;
	u32 i;

	/* The name must be a predefined ACPI name */

	predefined = acpi_ut_match_predefined_method(node->name.ascii);
	if (!predefined) {
		return (AE_OK);
	}

	if (node->type == ACPI_TYPE_LOCAL_SCOPE) {
		return (AE_OK);
	}

	pathname = acpi_ns_get_normalized_pathname(node, TRUE);
	if (!pathname) {
		return (AE_OK);
	}

	/* Get the object info for number of method parameters */

	status = acpi_get_object_info(obj_handle, &obj_info);
	if (ACPI_FAILURE(status)) {
		ACPI_FREE(pathname);
		return (status);
	}

	param_objects.count = 0;
	param_objects.pointer = NULL;

	if (obj_info->type == ACPI_TYPE_METHOD) {

		/* Setup default parameters (with proper types) */

		arg_type_list = predefined->info.argument_list;
		arg_count = METHOD_GET_ARG_COUNT(arg_type_list);

		/*
		 * Setup the ACPI-required number of arguments, regardless of what
		 * the actual method defines. If there is a difference, then the
		 * method is wrong and a warning will be issued during execution.
		 */
		this_param = params;
		for (i = 0; i < arg_count; i++) {
			arg_type = METHOD_GET_NEXT_TYPE(arg_type_list);
			this_param->type = arg_type;

			switch (arg_type) {
			case ACPI_TYPE_INTEGER:

				this_param->integer.value = 1;
				break;

			case ACPI_TYPE_STRING:

				this_param->string.pointer =
				    "This is the default argument string";
				this_param->string.length =
				    strlen(this_param->string.pointer);
				break;

			case ACPI_TYPE_BUFFER:

				this_param->buffer.pointer = (u8 *)params;	/* just a garbage buffer */
				this_param->buffer.length = 48;
				break;

			case ACPI_TYPE_PACKAGE:

				this_param->package.elements = NULL;
				this_param->package.count = 0;
				break;

			default:

				acpi_os_printf
				    ("%s: Unsupported argument type: %u\n",
				     pathname, arg_type);
				break;
			}

			this_param++;
		}

		param_objects.count = arg_count;
		param_objects.pointer = params;
	}

	ACPI_FREE(obj_info);
	return_obj.pointer = NULL;
	return_obj.length = ACPI_ALLOCATE_BUFFER;

	/* Do the actual method execution */

	acpi_gbl_method_executing = TRUE;

	status = acpi_evaluate_object(node, NULL, &param_objects, &return_obj);

	acpi_os_printf("%-32s returned %s\n",
		       pathname, acpi_format_exception(status));
	acpi_gbl_method_executing = FALSE;
	ACPI_FREE(pathname);

	/* Ignore status from method execution */

	status = AE_OK;

	/* Update count, check if we have executed enough methods */

	info->count++;
	if (info->count >= info->max_count) {
		status = AE_CTRL_TERMINATE;
	}

	return (status);
}