summaryrefslogtreecommitdiffstats
path: root/drivers/acpi/acpica/exoparg1.c
blob: 814b4a3d656ad1dc3d9acf438258735569017656 (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
/******************************************************************************
 *
 * Module Name: exoparg1 - AML execution - opcodes with 1 argument
 *
 *****************************************************************************/

/*
 * 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 "acparser.h"
#include "acdispat.h"
#include "acinterp.h"
#include "amlcode.h"
#include "acnamesp.h"

#define _COMPONENT          ACPI_EXECUTER
ACPI_MODULE_NAME("exoparg1")

/*!
 * Naming convention for AML interpreter execution routines.
 *
 * The routines that begin execution of AML opcodes are named with a common
 * convention based upon the number of arguments, the number of target operands,
 * and whether or not a value is returned:
 *
 *      AcpiExOpcode_xA_yT_zR
 *
 * Where:
 *
 * xA - ARGUMENTS:    The number of arguments (input operands) that are
 *                    required for this opcode type (0 through 6 args).
 * yT - TARGETS:      The number of targets (output operands) that are required
 *                    for this opcode type (0, 1, or 2 targets).
 * zR - RETURN VALUE: Indicates whether this opcode type returns a value
 *                    as the function return (0 or 1).
 *
 * The AcpiExOpcode* functions are called via the Dispatcher component with
 * fully resolved operands.
!*/
/*******************************************************************************
 *
 * FUNCTION:    acpi_ex_opcode_0A_0T_1R
 *
 * PARAMETERS:  walk_state          - Current state (contains AML opcode)
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Execute operator with no operands, one return value
 *
 ******************************************************************************/
acpi_status acpi_ex_opcode_0A_0T_1R(struct acpi_walk_state *walk_state)
{
	acpi_status status = AE_OK;
	union acpi_operand_object *return_desc = NULL;

	ACPI_FUNCTION_TRACE_STR(ex_opcode_0A_0T_1R,
				acpi_ps_get_opcode_name(walk_state->opcode));

	/* Examine the AML opcode */

	switch (walk_state->opcode) {
	case AML_TIMER_OP:	/*  Timer () */

		/* Create a return object of type Integer */

		return_desc =
		    acpi_ut_create_integer_object(acpi_os_get_timer());
		if (!return_desc) {
			status = AE_NO_MEMORY;
			goto cleanup;
		}
		break;

	default:		/*  Unknown opcode  */

		ACPI_ERROR((AE_INFO, "Unknown AML opcode 0x%X",
			    walk_state->opcode));
		status = AE_AML_BAD_OPCODE;
		break;
	}

      cleanup:

	/* Delete return object on error */

	if ((ACPI_FAILURE(status)) || walk_state->result_obj) {
		acpi_ut_remove_reference(return_desc);
		walk_state->result_obj = NULL;
	} else {
		/* Save the return value */

		walk_state->result_obj = return_desc;
	}

	return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ex_opcode_1A_0T_0R
 *
 * PARAMETERS:  walk_state          - Current state (contains AML opcode)
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Execute Type 1 monadic operator with numeric operand on
 *              object stack
 *
 ******************************************************************************/

acpi_status acpi_ex_opcode_1A_0T_0R(struct acpi_walk_state *walk_state)
{
	union acpi_operand_object **operand = &walk_state->operands[0];
	acpi_status status = AE_OK;

	ACPI_FUNCTION_TRACE_STR(ex_opcode_1A_0T_0R,
				acpi_ps_get_opcode_name(walk_state->opcode));

	/* Examine the AML opcode */

	switch (walk_state->opcode) {
	case AML_RELEASE_OP:	/*  Release (mutex_object) */

		status = acpi_ex_release_mutex(operand[0], walk_state);
		break;

	case AML_RESET_OP:	/*  Reset (event_object) */

		status = acpi_ex_system_reset_event(operand[0]);
		break;

	case AML_SIGNAL_OP:	/*  Signal (event_object) */

		status = acpi_ex_system_signal_event(operand[0]);
		break;

	case AML_SLEEP_OP:	/*  Sleep (msec_time) */

		status = acpi_ex_system_do_sleep(operand[0]->integer.value);
		break;

	case AML_STALL_OP:	/*  Stall (usec_time) */

		status =
		    acpi_ex_system_do_stall((u32) operand[0]->integer.value);
		break;

	case AML_UNLOAD_OP:	/*  Unload (Handle) */

		status = acpi_ex_unload_table(operand[0]);
		break;

	default:		/*  Unknown opcode  */

		ACPI_ERROR((AE_INFO, "Unknown AML opcode 0x%X",
			    walk_state->opcode));
		status = AE_AML_BAD_OPCODE;
		break;
	}

	return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ex_opcode_1A_1T_0R
 *
 * PARAMETERS:  walk_state          - Current state (contains AML opcode)
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Execute opcode with one argument, one target, and no
 *              return value.
 *
 ******************************************************************************/

acpi_status acpi_ex_opcode_1A_1T_0R(struct acpi_walk_state *walk_state)
{
	acpi_status status = AE_OK;
	union acpi_operand_object **operand = &walk_state->operands[0];

	ACPI_FUNCTION_TRACE_STR(ex_opcode_1A_1T_0R,
				acpi_ps_get_opcode_name(walk_state->opcode));

	/* Examine the AML opcode */

	switch (walk_state->opcode) {
	case AML_LOAD_OP:

		status = acpi_ex_load_op(operand[0], operand[1], walk_state);
		break;

	default:		/* Unknown opcode */

		ACPI_ERROR((AE_INFO, "Unknown AML opcode 0x%X",
			    walk_state->opcode));
		status = AE_AML_BAD_OPCODE;
		goto cleanup;
	}

      cleanup:

	return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ex_opcode_1A_1T_1R
 *
 * PARAMETERS:  walk_state          - Current state (contains AML opcode)
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Execute opcode with one argument, one target, and a
 *              return value.
 *
 ******************************************************************************/

acpi_status acpi_ex_opcode_1A_1T_1R(struct acpi_walk_state *walk_state)
{
	acpi_status status = AE_OK;
	union acpi_operand_object **operand = &walk_state->operands[0];
	union acpi_operand_object *return_desc = NULL;
	union acpi_operand_object *return_desc2 = NULL;
	u32 temp32;
	u32 i;
	u64 power_of_ten;
	u64 digit;

	ACPI_FUNCTION_TRACE_STR(ex_opcode_1A_1T_1R,
				acpi_ps_get_opcode_name(walk_state->opcode));

	/* Examine the AML opcode */

	switch (walk_state->opcode) {
	case AML_BIT_NOT_OP:
	case AML_FIND_SET_LEFT_BIT_OP:
	case AML_FIND_SET_RIGHT_BIT_OP:
	case AML_FROM_BCD_OP:
	case AML_TO_BCD_OP:
	case AML_COND_REF_OF_OP:

		/* Create a return object of type Integer for these opcodes */

		return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
		if (!return_desc) {
			status = AE_NO_MEMORY;
			goto cleanup;
		}

		switch (walk_state->opcode) {
		case AML_BIT_NOT_OP:	/* Not (Operand, Result)  */

			return_desc->integer.value = ~operand[0]->integer.value;
			break;

		case AML_FIND_SET_LEFT_BIT_OP:	/* find_set_left_bit (Operand, Result) */

			return_desc->integer.value = operand[0]->integer.value;

			/*
			 * Acpi specification describes Integer type as a little
			 * endian unsigned value, so this boundary condition is valid.
			 */
			for (temp32 = 0; return_desc->integer.value &&
			     temp32 < ACPI_INTEGER_BIT_SIZE; ++temp32) {
				return_desc->integer.value >>= 1;
			}

			return_desc->integer.value = temp32;
			break;

		case AML_FIND_SET_RIGHT_BIT_OP:	/* find_set_right_bit (Operand, Result) */

			return_desc->integer.value = operand[0]->integer.value;

			/*
			 * The Acpi specification describes Integer type as a little
			 * endian unsigned value, so this boundary condition is valid.
			 */
			for (temp32 = 0; return_desc->integer.value &&
			     temp32 < ACPI_INTEGER_BIT_SIZE; ++temp32) {
				return_desc->integer.value <<= 1;
			}

			/* Since the bit position is one-based, subtract from 33 (65) */

			return_desc->integer.value =
			    temp32 ==
			    0 ? 0 : (ACPI_INTEGER_BIT_SIZE + 1) - temp32;
			break;

		case AML_FROM_BCD_OP:	/* from_bcd (BCDValue, Result) */
			/*
			 * The 64-bit ACPI integer can hold 16 4-bit BCD characters
			 * (if table is 32-bit, integer can hold 8 BCD characters)
			 * Convert each 4-bit BCD value
			 */
			power_of_ten = 1;
			return_desc->integer.value = 0;
			digit = operand[0]->integer.value;

			/* Convert each BCD digit (each is one nybble wide) */

			for (i = 0;
			     (i < acpi_gbl_integer_nybble_width) && (digit > 0);
			     i++) {

				/* Get the least significant 4-bit BCD digit */

				temp32 = ((u32) digit) & 0xF;

				/* Check the range of the digit */

				if (temp32 > 9) {
					ACPI_ERROR((AE_INFO,
						    "BCD digit too large (not decimal): 0x%X",
						    temp32));

					status = AE_AML_NUMERIC_OVERFLOW;
					goto cleanup;
				}

				/* Sum the digit into the result with the current power of 10 */

				return_desc->integer.value +=
				    (((u64) temp32) * power_of_ten);

				/* Shift to next BCD digit */

				digit >>= 4;

				/* Next power of 10 */

				power_of_ten *= 10;
			}
			break;

		case AML_TO_BCD_OP:	/* to_bcd (Operand, Result) */

			return_desc->integer.value = 0;
			digit = operand[0]->integer.value;

			/* Each BCD digit is one nybble wide */

			for (i = 0;
			     (i < acpi_gbl_integer_nybble_width) && (digit > 0);
			     i++) {
				(void)acpi_ut_short_divide(digit, 10, &digit,
							   &temp32);

				/*
				 * Insert the BCD digit that resides in the
				 * remainder from above
				 */
				return_desc->integer.value |=
				    (((u64) temp32) << ACPI_MUL_4(i));
			}

			/* Overflow if there is any data left in Digit */

			if (digit > 0) {
				ACPI_ERROR((AE_INFO,
					    "Integer too large to convert to BCD: 0x%8.8X%8.8X",
					    ACPI_FORMAT_UINT64(operand[0]->
							       integer.value)));
				status = AE_AML_NUMERIC_OVERFLOW;
				goto cleanup;
			}
			break;

		case AML_COND_REF_OF_OP:	/* cond_ref_of (source_object, Result) */
			/*
			 * This op is a little strange because the internal return value is
			 * different than the return value stored in the result descriptor
			 * (There are really two return values)
			 */
			if ((struct acpi_namespace_node *)operand[0] ==
			    acpi_gbl_root_node) {
				/*
				 * This means that the object does not exist in the namespace,
				 * return FALSE
				 */
				return_desc->integer.value = 0;
				goto cleanup;
			}

			/* Get the object reference, store it, and remove our reference */

			status = acpi_ex_get_object_reference(operand[0],
							      &return_desc2,
							      walk_state);
			if (ACPI_FAILURE(status)) {
				goto cleanup;
			}

			status =
			    acpi_ex_store(return_desc2, operand[1], walk_state);
			acpi_ut_remove_reference(return_desc2);

			/* The object exists in the namespace, return TRUE */

			return_desc->integer.value = ACPI_UINT64_MAX;
			goto cleanup;

		default:

			/* No other opcodes get here */

			break;
		}
		break;

	case AML_STORE_OP:	/* Store (Source, Target) */
		/*
		 * A store operand is typically a number, string, buffer or lvalue
		 * Be careful about deleting the source object,
		 * since the object itself may have been stored.
		 */
		status = acpi_ex_store(operand[0], operand[1], walk_state);
		if (ACPI_FAILURE(status)) {
			return_ACPI_STATUS(status);
		}

		/* It is possible that the Store already produced a return object */

		if (!walk_state->result_obj) {
			/*
			 * Normally, we would remove a reference on the Operand[0]
			 * parameter; But since it is being used as the internal return
			 * object (meaning we would normally increment it), the two
			 * cancel out, and we simply don't do anything.
			 */
			walk_state->result_obj = operand[0];
			walk_state->operands[0] = NULL;	/* Prevent deletion */
		}
		return_ACPI_STATUS(status);

		/*
		 * ACPI 2.0 Opcodes
		 */
	case AML_COPY_OP:	/* Copy (Source, Target) */

		status =
		    acpi_ut_copy_iobject_to_iobject(operand[0], &return_desc,
						    walk_state);
		break;

	case AML_TO_DECSTRING_OP:	/* to_decimal_string (Data, Result) */

		status = acpi_ex_convert_to_string(operand[0], &return_desc,
						   ACPI_EXPLICIT_CONVERT_DECIMAL);
		if (return_desc == operand[0]) {

			/* No conversion performed, add ref to handle return value */
			acpi_ut_add_reference(return_desc);
		}
		break;

	case AML_TO_HEXSTRING_OP:	/* to_hex_string (Data, Result) */

		status = acpi_ex_convert_to_string(operand[0], &return_desc,
						   ACPI_EXPLICIT_CONVERT_HEX);
		if (return_desc == operand[0]) {

			/* No conversion performed, add ref to handle return value */
			acpi_ut_add_reference(return_desc);
		}
		break;

	case AML_TO_BUFFER_OP:	/* to_buffer (Data, Result) */

		status = acpi_ex_convert_to_buffer(operand[0], &return_desc);
		if (return_desc == operand[0]) {

			/* No conversion performed, add ref to handle return value */
			acpi_ut_add_reference(return_desc);
		}
		break;

	case AML_TO_INTEGER_OP:	/* to_integer (Data, Result) */

		status = acpi_ex_convert_to_integer(operand[0], &return_desc,
						    ACPI_ANY_BASE);
		if (return_desc == operand[0]) {

			/* No conversion performed, add ref to handle return value */
			acpi_ut_add_reference(return_desc);
		}
		break;

	case AML_SHIFT_LEFT_BIT_OP:	/* shift_left_bit (Source, bit_num) */
	case AML_SHIFT_RIGHT_BIT_OP:	/* shift_right_bit (Source, bit_num) */

		/* These are two obsolete opcodes */

		ACPI_ERROR((AE_INFO,
			    "%s is obsolete and not implemented",
			    acpi_ps_get_opcode_name(walk_state->opcode)));
		status = AE_SUPPORT;
		goto cleanup;

	default:		/* Unknown opcode */

		ACPI_ERROR((AE_INFO, "Unknown AML opcode 0x%X",
			    walk_state->opcode));
		status = AE_AML_BAD_OPCODE;
		goto cleanup;
	}

	if (ACPI_SUCCESS(status)) {

		/* Store the return value computed above into the target object */

		status = acpi_ex_store(return_desc, operand[1], walk_state);
	}

      cleanup:

	/* Delete return object on error */

	if (ACPI_FAILURE(status)) {
		acpi_ut_remove_reference(return_desc);
	}

	/* Save return object on success */

	else if (!walk_state->result_obj) {
		walk_state->result_obj = return_desc;
	}

	return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ex_opcode_1A_0T_1R
 *
 * PARAMETERS:  walk_state          - Current state (contains AML opcode)
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Execute opcode with one argument, no target, and a return value
 *
 ******************************************************************************/

acpi_status acpi_ex_opcode_1A_0T_1R(struct acpi_walk_state *walk_state)
{
	union acpi_operand_object **operand = &walk_state->operands[0];
	union acpi_operand_object *temp_desc;
	union acpi_operand_object *return_desc = NULL;
	acpi_status status = AE_OK;
	u32 type;
	u64 value;

	ACPI_FUNCTION_TRACE_STR(ex_opcode_1A_0T_1R,
				acpi_ps_get_opcode_name(walk_state->opcode));

	/* Examine the AML opcode */

	switch (walk_state->opcode) {
	case AML_LNOT_OP:	/* LNot (Operand) */

		return_desc = acpi_ut_create_integer_object((u64) 0);
		if (!return_desc) {
			status = AE_NO_MEMORY;
			goto cleanup;
		}

		/*
		 * Set result to ONES (TRUE) if Value == 0. Note:
		 * return_desc->Integer.Value is initially == 0 (FALSE) from above.
		 */
		if (!operand[0]->integer.value) {
			return_desc->integer.value = ACPI_UINT64_MAX;
		}
		break;

	case AML_DECREMENT_OP:	/* Decrement (Operand)  */
	case AML_INCREMENT_OP:	/* Increment (Operand)  */
		/*
		 * Create a new integer. Can't just get the base integer and
		 * increment it because it may be an Arg or Field.
		 */
		return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
		if (!return_desc) {
			status = AE_NO_MEMORY;
			goto cleanup;
		}

		/*
		 * Since we are expecting a Reference operand, it can be either a
		 * NS Node or an internal object.
		 */
		temp_desc = operand[0];
		if (ACPI_GET_DESCRIPTOR_TYPE(temp_desc) ==
		    ACPI_DESC_TYPE_OPERAND) {

			/* Internal reference object - prevent deletion */

			acpi_ut_add_reference(temp_desc);
		}

		/*
		 * Convert the Reference operand to an Integer (This removes a
		 * reference on the Operand[0] object)
		 *
		 * NOTE:  We use LNOT_OP here in order to force resolution of the
		 * reference operand to an actual integer.
		 */
		status =
		    acpi_ex_resolve_operands(AML_LNOT_OP, &temp_desc,
					     walk_state);
		if (ACPI_FAILURE(status)) {
			ACPI_EXCEPTION((AE_INFO, status,
					"While resolving operands for [%s]",
					acpi_ps_get_opcode_name(walk_state->
								opcode)));

			goto cleanup;
		}

		/*
		 * temp_desc is now guaranteed to be an Integer object --
		 * Perform the actual increment or decrement
		 */
		if (walk_state->opcode == AML_INCREMENT_OP) {
			return_desc->integer.value =
			    temp_desc->integer.value + 1;
		} else {
			return_desc->integer.value =
			    temp_desc->integer.value - 1;
		}

		/* Finished with this Integer object */

		acpi_ut_remove_reference(temp_desc);

		/*
		 * Store the result back (indirectly) through the original
		 * Reference object
		 */
		status = acpi_ex_store(return_desc, operand[0], walk_state);
		break;

	case AML_TYPE_OP:	/* object_type (source_object) */
		/*
		 * Note: The operand is not resolved at this point because we want to
		 * get the associated object, not its value. For example, we don't
		 * want to resolve a field_unit to its value, we want the actual
		 * field_unit object.
		 */

		/* Get the type of the base object */

		status =
		    acpi_ex_resolve_multiple(walk_state, operand[0], &type,
					     NULL);
		if (ACPI_FAILURE(status)) {
			goto cleanup;
		}

		/* Allocate a descriptor to hold the type. */

		return_desc = acpi_ut_create_integer_object((u64) type);
		if (!return_desc) {
			status = AE_NO_MEMORY;
			goto cleanup;
		}
		break;

	case AML_SIZE_OF_OP:	/* size_of (source_object) */
		/*
		 * Note: The operand is not resolved at this point because we want to
		 * get the associated object, not its value.
		 */

		/* Get the base object */

		status = acpi_ex_resolve_multiple(walk_state,
						  operand[0], &type,
						  &temp_desc);
		if (ACPI_FAILURE(status)) {
			goto cleanup;
		}

		/*
		 * The type of the base object must be integer, buffer, string, or
		 * package. All others are not supported.
		 *
		 * NOTE: Integer is not specifically supported by the ACPI spec,
		 * but is supported implicitly via implicit operand conversion.
		 * rather than bother with conversion, we just use the byte width
		 * global (4 or 8 bytes).
		 */
		switch (type) {
		case ACPI_TYPE_INTEGER:

			value = acpi_gbl_integer_byte_width;
			break;

		case ACPI_TYPE_STRING:

			value = temp_desc->string.length;
			break;

		case ACPI_TYPE_BUFFER:

			/* Buffer arguments may not be evaluated at this point */

			status = acpi_ds_get_buffer_arguments(temp_desc);
			value = temp_desc->buffer.length;
			break;

		case ACPI_TYPE_PACKAGE:

			/* Package arguments may not be evaluated at this point */

			status = acpi_ds_get_package_arguments(temp_desc);
			value = temp_desc->package.count;
			break;

		default:

			ACPI_ERROR((AE_INFO,
				    "Operand must be Buffer/Integer/String/Package - found type %s",
				    acpi_ut_get_type_name(type)));
			status = AE_AML_OPERAND_TYPE;
			goto cleanup;
		}

		if (ACPI_FAILURE(status)) {
			goto cleanup;
		}

		/*
		 * Now that we have the size of the object, create a result
		 * object to hold the value
		 */
		return_desc = acpi_ut_create_integer_object(value);
		if (!return_desc) {
			status = AE_NO_MEMORY;
			goto cleanup;
		}
		break;

	case AML_REF_OF_OP:	/* ref_of (source_object) */

		status =
		    acpi_ex_get_object_reference(operand[0], &return_desc,
						 walk_state);
		if (ACPI_FAILURE(status)) {
			goto cleanup;
		}
		break;

	case AML_DEREF_OF_OP:	/* deref_of (obj_reference | String) */

		/* Check for a method local or argument, or standalone String */

		if (ACPI_GET_DESCRIPTOR_TYPE(operand[0]) ==
		    ACPI_DESC_TYPE_NAMED) {
			temp_desc =
			    acpi_ns_get_attached_object((struct
							 acpi_namespace_node *)
							operand[0]);
			if (temp_desc
			    && ((temp_desc->common.type == ACPI_TYPE_STRING)
				|| (temp_desc->common.type ==
				    ACPI_TYPE_LOCAL_REFERENCE))) {
				operand[0] = temp_desc;
				acpi_ut_add_reference(temp_desc);
			} else {
				status = AE_AML_OPERAND_TYPE;
				goto cleanup;
			}
		} else {
			switch ((operand[0])->common.type) {
			case ACPI_TYPE_LOCAL_REFERENCE:
				/*
				 * This is a deref_of (local_x | arg_x)
				 *
				 * Must resolve/dereference the local/arg reference first
				 */
				switch (operand[0]->reference.class) {
				case ACPI_REFCLASS_LOCAL:
				case ACPI_REFCLASS_ARG:

					/* Set Operand[0] to the value of the local/arg */

					status =
					    acpi_ds_method_data_get_value
					    (operand[0]->reference.class,
					     operand[0]->reference.value,
					     walk_state, &temp_desc);
					if (ACPI_FAILURE(status)) {
						goto cleanup;
					}

					/*
					 * Delete our reference to the input object and
					 * point to the object just retrieved
					 */
					acpi_ut_remove_reference(operand[0]);
					operand[0] = temp_desc;
					break;

				case ACPI_REFCLASS_REFOF:

					/* Get the object to which the reference refers */

					temp_desc =
					    operand[0]->reference.object;
					acpi_ut_remove_reference(operand[0]);
					operand[0] = temp_desc;
					break;

				default:

					/* Must be an Index op - handled below */
					break;
				}
				break;

			case ACPI_TYPE_STRING:

				break;

			default:

				status = AE_AML_OPERAND_TYPE;
				goto cleanup;
			}
		}

		if (ACPI_GET_DESCRIPTOR_TYPE(operand[0]) !=
		    ACPI_DESC_TYPE_NAMED) {
			if ((operand[0])->common.type == ACPI_TYPE_STRING) {
				/*
				 * This is a deref_of (String). The string is a reference
				 * to a named ACPI object.
				 *
				 * 1) Find the owning Node
				 * 2) Dereference the node to an actual object. Could be a
				 *    Field, so we need to resolve the node to a value.
				 */
				status =
				    acpi_ns_get_node(walk_state->scope_info->
						     scope.node,
						     operand[0]->string.pointer,
						     ACPI_NS_SEARCH_PARENT,
						     ACPI_CAST_INDIRECT_PTR
						     (struct
						      acpi_namespace_node,
						      &return_desc));
				if (ACPI_FAILURE(status)) {
					goto cleanup;
				}

				status =
				    acpi_ex_resolve_node_to_value
				    (ACPI_CAST_INDIRECT_PTR
				     (struct acpi_namespace_node, &return_desc),
				     walk_state);
				goto cleanup;
			}
		}

		/* Operand[0] may have changed from the code above */

		if (ACPI_GET_DESCRIPTOR_TYPE(operand[0]) ==
		    ACPI_DESC_TYPE_NAMED) {
			/*
			 * This is a deref_of (object_reference)
			 * Get the actual object from the Node (This is the dereference).
			 * This case may only happen when a local_x or arg_x is
			 * dereferenced above.
			 */
			return_desc = acpi_ns_get_attached_object((struct
								   acpi_namespace_node
								   *)
								  operand[0]);
			acpi_ut_add_reference(return_desc);
		} else {
			/*
			 * This must be a reference object produced by either the
			 * Index() or ref_of() operator
			 */
			switch (operand[0]->reference.class) {
			case ACPI_REFCLASS_INDEX:
				/*
				 * The target type for the Index operator must be
				 * either a Buffer or a Package
				 */
				switch (operand[0]->reference.target_type) {
				case ACPI_TYPE_BUFFER_FIELD:

					temp_desc =
					    operand[0]->reference.object;

					/*
					 * Create a new object that contains one element of the
					 * buffer -- the element pointed to by the index.
					 *
					 * NOTE: index into a buffer is NOT a pointer to a
					 * sub-buffer of the main buffer, it is only a pointer to a
					 * single element (byte) of the buffer!
					 *
					 * Since we are returning the value of the buffer at the
					 * indexed location, we don't need to add an additional
					 * reference to the buffer itself.
					 */
					return_desc =
					    acpi_ut_create_integer_object((u64)
									  temp_desc->buffer.pointer[operand[0]->reference.value]);
					if (!return_desc) {
						status = AE_NO_MEMORY;
						goto cleanup;
					}
					break;

				case ACPI_TYPE_PACKAGE:
					/*
					 * Return the referenced element of the package. We must
					 * add another reference to the referenced object, however.
					 */
					return_desc =
					    *(operand[0]->reference.where);
					if (return_desc) {
						acpi_ut_add_reference
						    (return_desc);
					}
					break;

				default:

					ACPI_ERROR((AE_INFO,
						    "Unknown Index TargetType 0x%X in reference object %p",
						    operand[0]->reference.
						    target_type, operand[0]));
					status = AE_AML_OPERAND_TYPE;
					goto cleanup;
				}
				break;

			case ACPI_REFCLASS_REFOF:

				return_desc = operand[0]->reference.object;

				if (ACPI_GET_DESCRIPTOR_TYPE(return_desc) ==
				    ACPI_DESC_TYPE_NAMED) {
					return_desc =
					    acpi_ns_get_attached_object((struct
									 acpi_namespace_node
									 *)
									return_desc);
				}

				/* Add another reference to the object! */

				acpi_ut_add_reference(return_desc);
				break;

			default:

				ACPI_ERROR((AE_INFO,
					    "Unknown class in reference(%p) - 0x%2.2X",
					    operand[0],
					    operand[0]->reference.class));

				status = AE_TYPE;
				goto cleanup;
			}
		}
		break;

	default:

		ACPI_ERROR((AE_INFO, "Unknown AML opcode 0x%X",
			    walk_state->opcode));
		status = AE_AML_BAD_OPCODE;
		goto cleanup;
	}

      cleanup:

	/* Delete return object on error */

	if (ACPI_FAILURE(status)) {
		acpi_ut_remove_reference(return_desc);
	}

	/* Save return object on success */

	else {
		walk_state->result_obj = return_desc;
	}

	return_ACPI_STATUS(status);
}
OpenPOWER on IntegriCloud