1 // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
2 /******************************************************************************
3 *
4 * Module Name: exoparg1 - AML execution - opcodes with 1 argument
5 *
6 * Copyright (C) 2000 - 2021, Intel Corp.
7 *
8 *****************************************************************************/
9
10 #include <acpi/acpi.h>
11 #include "accommon.h"
12 #include "acparser.h"
13 #include "acdispat.h"
14 #include "acinterp.h"
15 #include "amlcode.h"
16 #include "acnamesp.h"
17
18 #define _COMPONENT ACPI_EXECUTER
19 ACPI_MODULE_NAME("exoparg1")
20
21 /*!
22 * Naming convention for AML interpreter execution routines.
23 *
24 * The routines that begin execution of AML opcodes are named with a common
25 * convention based upon the number of arguments, the number of target operands,
26 * and whether or not a value is returned:
27 *
28 * AcpiExOpcode_xA_yT_zR
29 *
30 * Where:
31 *
32 * xA - ARGUMENTS: The number of arguments (input operands) that are
33 * required for this opcode type (0 through 6 args).
34 * yT - TARGETS: The number of targets (output operands) that are required
35 * for this opcode type (0, 1, or 2 targets).
36 * zR - RETURN VALUE: Indicates whether this opcode type returns a value
37 * as the function return (0 or 1).
38 *
39 * The AcpiExOpcode* functions are called via the Dispatcher component with
40 * fully resolved operands.
41 !*/
42 /*******************************************************************************
43 *
44 * FUNCTION: acpi_ex_opcode_0A_0T_1R
45 *
46 * PARAMETERS: walk_state - Current state (contains AML opcode)
47 *
48 * RETURN: Status
49 *
50 * DESCRIPTION: Execute operator with no operands, one return value
51 *
52 ******************************************************************************/
acpi_ex_opcode_0A_0T_1R(struct acpi_walk_state * walk_state)53 acpi_status acpi_ex_opcode_0A_0T_1R(struct acpi_walk_state *walk_state)
54 {
55 acpi_status status = AE_OK;
56 union acpi_operand_object *return_desc = NULL;
57
58 ACPI_FUNCTION_TRACE_STR(ex_opcode_0A_0T_1R,
59 acpi_ps_get_opcode_name(walk_state->opcode));
60
61 /* Examine the AML opcode */
62
63 switch (walk_state->opcode) {
64 case AML_TIMER_OP: /* Timer () */
65
66 /* Create a return object of type Integer */
67
68 return_desc =
69 acpi_ut_create_integer_object(acpi_os_get_timer());
70 if (!return_desc) {
71 status = AE_NO_MEMORY;
72 goto cleanup;
73 }
74 break;
75
76 default: /* Unknown opcode */
77
78 ACPI_ERROR((AE_INFO, "Unknown AML opcode 0x%X",
79 walk_state->opcode));
80 status = AE_AML_BAD_OPCODE;
81 break;
82 }
83
84 cleanup:
85
86 /* Delete return object on error */
87
88 if ((ACPI_FAILURE(status)) || walk_state->result_obj) {
89 acpi_ut_remove_reference(return_desc);
90 walk_state->result_obj = NULL;
91 } else {
92 /* Save the return value */
93
94 walk_state->result_obj = return_desc;
95 }
96
97 return_ACPI_STATUS(status);
98 }
99
100 /*******************************************************************************
101 *
102 * FUNCTION: acpi_ex_opcode_1A_0T_0R
103 *
104 * PARAMETERS: walk_state - Current state (contains AML opcode)
105 *
106 * RETURN: Status
107 *
108 * DESCRIPTION: Execute Type 1 monadic operator with numeric operand on
109 * object stack
110 *
111 ******************************************************************************/
112
acpi_ex_opcode_1A_0T_0R(struct acpi_walk_state * walk_state)113 acpi_status acpi_ex_opcode_1A_0T_0R(struct acpi_walk_state *walk_state)
114 {
115 union acpi_operand_object **operand = &walk_state->operands[0];
116 acpi_status status = AE_OK;
117
118 ACPI_FUNCTION_TRACE_STR(ex_opcode_1A_0T_0R,
119 acpi_ps_get_opcode_name(walk_state->opcode));
120
121 /* Examine the AML opcode */
122
123 switch (walk_state->opcode) {
124 case AML_RELEASE_OP: /* Release (mutex_object) */
125
126 status = acpi_ex_release_mutex(operand[0], walk_state);
127 break;
128
129 case AML_RESET_OP: /* Reset (event_object) */
130
131 status = acpi_ex_system_reset_event(operand[0]);
132 break;
133
134 case AML_SIGNAL_OP: /* Signal (event_object) */
135
136 status = acpi_ex_system_signal_event(operand[0]);
137 break;
138
139 case AML_SLEEP_OP: /* Sleep (msec_time) */
140
141 status = acpi_ex_system_do_sleep(operand[0]->integer.value);
142 break;
143
144 case AML_STALL_OP: /* Stall (usec_time) */
145
146 status =
147 acpi_ex_system_do_stall((u32) operand[0]->integer.value);
148 break;
149
150 case AML_UNLOAD_OP: /* Unload (Handle) */
151
152 status = acpi_ex_unload_table(operand[0]);
153 break;
154
155 default: /* Unknown opcode */
156
157 ACPI_ERROR((AE_INFO, "Unknown AML opcode 0x%X",
158 walk_state->opcode));
159 status = AE_AML_BAD_OPCODE;
160 break;
161 }
162
163 return_ACPI_STATUS(status);
164 }
165
166 /*******************************************************************************
167 *
168 * FUNCTION: acpi_ex_opcode_1A_1T_0R
169 *
170 * PARAMETERS: walk_state - Current state (contains AML opcode)
171 *
172 * RETURN: Status
173 *
174 * DESCRIPTION: Execute opcode with one argument, one target, and no
175 * return value.
176 *
177 ******************************************************************************/
178
acpi_ex_opcode_1A_1T_0R(struct acpi_walk_state * walk_state)179 acpi_status acpi_ex_opcode_1A_1T_0R(struct acpi_walk_state *walk_state)
180 {
181 acpi_status status = AE_OK;
182 union acpi_operand_object **operand = &walk_state->operands[0];
183
184 ACPI_FUNCTION_TRACE_STR(ex_opcode_1A_1T_0R,
185 acpi_ps_get_opcode_name(walk_state->opcode));
186
187 /* Examine the AML opcode */
188
189 switch (walk_state->opcode) {
190 case AML_LOAD_OP:
191
192 status = acpi_ex_load_op(operand[0], operand[1], walk_state);
193 break;
194
195 default: /* Unknown opcode */
196
197 ACPI_ERROR((AE_INFO, "Unknown AML opcode 0x%X",
198 walk_state->opcode));
199 status = AE_AML_BAD_OPCODE;
200 goto cleanup;
201 }
202
203 cleanup:
204
205 return_ACPI_STATUS(status);
206 }
207
208 /*******************************************************************************
209 *
210 * FUNCTION: acpi_ex_opcode_1A_1T_1R
211 *
212 * PARAMETERS: walk_state - Current state (contains AML opcode)
213 *
214 * RETURN: Status
215 *
216 * DESCRIPTION: Execute opcode with one argument, one target, and a
217 * return value.
218 *
219 ******************************************************************************/
220
acpi_ex_opcode_1A_1T_1R(struct acpi_walk_state * walk_state)221 acpi_status acpi_ex_opcode_1A_1T_1R(struct acpi_walk_state *walk_state)
222 {
223 acpi_status status = AE_OK;
224 union acpi_operand_object **operand = &walk_state->operands[0];
225 union acpi_operand_object *return_desc = NULL;
226 union acpi_operand_object *return_desc2 = NULL;
227 u32 temp32;
228 u32 i;
229 u64 power_of_ten;
230 u64 digit;
231
232 ACPI_FUNCTION_TRACE_STR(ex_opcode_1A_1T_1R,
233 acpi_ps_get_opcode_name(walk_state->opcode));
234
235 /* Examine the AML opcode */
236
237 switch (walk_state->opcode) {
238 case AML_BIT_NOT_OP:
239 case AML_FIND_SET_LEFT_BIT_OP:
240 case AML_FIND_SET_RIGHT_BIT_OP:
241 case AML_FROM_BCD_OP:
242 case AML_TO_BCD_OP:
243 case AML_CONDITIONAL_REF_OF_OP:
244
245 /* Create a return object of type Integer for these opcodes */
246
247 return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
248 if (!return_desc) {
249 status = AE_NO_MEMORY;
250 goto cleanup;
251 }
252
253 switch (walk_state->opcode) {
254 case AML_BIT_NOT_OP: /* Not (Operand, Result) */
255
256 return_desc->integer.value = ~operand[0]->integer.value;
257 break;
258
259 case AML_FIND_SET_LEFT_BIT_OP: /* find_set_left_bit (Operand, Result) */
260
261 return_desc->integer.value = operand[0]->integer.value;
262
263 /*
264 * Acpi specification describes Integer type as a little
265 * endian unsigned value, so this boundary condition is valid.
266 */
267 for (temp32 = 0; return_desc->integer.value &&
268 temp32 < ACPI_INTEGER_BIT_SIZE; ++temp32) {
269 return_desc->integer.value >>= 1;
270 }
271
272 return_desc->integer.value = temp32;
273 break;
274
275 case AML_FIND_SET_RIGHT_BIT_OP: /* find_set_right_bit (Operand, Result) */
276
277 return_desc->integer.value = operand[0]->integer.value;
278
279 /*
280 * The Acpi specification describes Integer type as a little
281 * endian unsigned value, so this boundary condition is valid.
282 */
283 for (temp32 = 0; return_desc->integer.value &&
284 temp32 < ACPI_INTEGER_BIT_SIZE; ++temp32) {
285 return_desc->integer.value <<= 1;
286 }
287
288 /* Since the bit position is one-based, subtract from 33 (65) */
289
290 return_desc->integer.value =
291 temp32 ==
292 0 ? 0 : (ACPI_INTEGER_BIT_SIZE + 1) - temp32;
293 break;
294
295 case AML_FROM_BCD_OP: /* from_bcd (BCDValue, Result) */
296 /*
297 * The 64-bit ACPI integer can hold 16 4-bit BCD characters
298 * (if table is 32-bit, integer can hold 8 BCD characters)
299 * Convert each 4-bit BCD value
300 */
301 power_of_ten = 1;
302 return_desc->integer.value = 0;
303 digit = operand[0]->integer.value;
304
305 /* Convert each BCD digit (each is one nybble wide) */
306
307 for (i = 0;
308 (i < acpi_gbl_integer_nybble_width) && (digit > 0);
309 i++) {
310
311 /* Get the least significant 4-bit BCD digit */
312
313 temp32 = ((u32) digit) & 0xF;
314
315 /* Check the range of the digit */
316
317 if (temp32 > 9) {
318 ACPI_ERROR((AE_INFO,
319 "BCD digit too large (not decimal): 0x%X",
320 temp32));
321
322 status = AE_AML_NUMERIC_OVERFLOW;
323 goto cleanup;
324 }
325
326 /* Sum the digit into the result with the current power of 10 */
327
328 return_desc->integer.value +=
329 (((u64) temp32) * power_of_ten);
330
331 /* Shift to next BCD digit */
332
333 digit >>= 4;
334
335 /* Next power of 10 */
336
337 power_of_ten *= 10;
338 }
339 break;
340
341 case AML_TO_BCD_OP: /* to_bcd (Operand, Result) */
342
343 return_desc->integer.value = 0;
344 digit = operand[0]->integer.value;
345
346 /* Each BCD digit is one nybble wide */
347
348 for (i = 0;
349 (i < acpi_gbl_integer_nybble_width) && (digit > 0);
350 i++) {
351 (void)acpi_ut_short_divide(digit, 10, &digit,
352 &temp32);
353
354 /*
355 * Insert the BCD digit that resides in the
356 * remainder from above
357 */
358 return_desc->integer.value |=
359 (((u64) temp32) << ACPI_MUL_4(i));
360 }
361
362 /* Overflow if there is any data left in Digit */
363
364 if (digit > 0) {
365 ACPI_ERROR((AE_INFO,
366 "Integer too large to convert to BCD: 0x%8.8X%8.8X",
367 ACPI_FORMAT_UINT64(operand[0]->
368 integer.value)));
369 status = AE_AML_NUMERIC_OVERFLOW;
370 goto cleanup;
371 }
372 break;
373
374 case AML_CONDITIONAL_REF_OF_OP: /* cond_ref_of (source_object, Result) */
375 /*
376 * This op is a little strange because the internal return value is
377 * different than the return value stored in the result descriptor
378 * (There are really two return values)
379 */
380 if ((struct acpi_namespace_node *)operand[0] ==
381 acpi_gbl_root_node) {
382 /*
383 * This means that the object does not exist in the namespace,
384 * return FALSE
385 */
386 return_desc->integer.value = 0;
387 goto cleanup;
388 }
389
390 /* Get the object reference, store it, and remove our reference */
391
392 status = acpi_ex_get_object_reference(operand[0],
393 &return_desc2,
394 walk_state);
395 if (ACPI_FAILURE(status)) {
396 goto cleanup;
397 }
398
399 status =
400 acpi_ex_store(return_desc2, operand[1], walk_state);
401 acpi_ut_remove_reference(return_desc2);
402
403 /* The object exists in the namespace, return TRUE */
404
405 return_desc->integer.value = ACPI_UINT64_MAX;
406 goto cleanup;
407
408 default:
409
410 /* No other opcodes get here */
411
412 break;
413 }
414 break;
415
416 case AML_STORE_OP: /* Store (Source, Target) */
417 /*
418 * A store operand is typically a number, string, buffer or lvalue
419 * Be careful about deleting the source object,
420 * since the object itself may have been stored.
421 */
422 status = acpi_ex_store(operand[0], operand[1], walk_state);
423 if (ACPI_FAILURE(status)) {
424 return_ACPI_STATUS(status);
425 }
426
427 /* It is possible that the Store already produced a return object */
428
429 if (!walk_state->result_obj) {
430 /*
431 * Normally, we would remove a reference on the Operand[0]
432 * parameter; But since it is being used as the internal return
433 * object (meaning we would normally increment it), the two
434 * cancel out, and we simply don't do anything.
435 */
436 walk_state->result_obj = operand[0];
437 walk_state->operands[0] = NULL; /* Prevent deletion */
438 }
439 return_ACPI_STATUS(status);
440
441 /*
442 * ACPI 2.0 Opcodes
443 */
444 case AML_COPY_OBJECT_OP: /* copy_object (Source, Target) */
445
446 status =
447 acpi_ut_copy_iobject_to_iobject(operand[0], &return_desc,
448 walk_state);
449 break;
450
451 case AML_TO_DECIMAL_STRING_OP: /* to_decimal_string (Data, Result) */
452
453 status =
454 acpi_ex_convert_to_string(operand[0], &return_desc,
455 ACPI_EXPLICIT_CONVERT_DECIMAL);
456 if (return_desc == operand[0]) {
457
458 /* No conversion performed, add ref to handle return value */
459
460 acpi_ut_add_reference(return_desc);
461 }
462 break;
463
464 case AML_TO_HEX_STRING_OP: /* to_hex_string (Data, Result) */
465
466 status =
467 acpi_ex_convert_to_string(operand[0], &return_desc,
468 ACPI_EXPLICIT_CONVERT_HEX);
469 if (return_desc == operand[0]) {
470
471 /* No conversion performed, add ref to handle return value */
472
473 acpi_ut_add_reference(return_desc);
474 }
475 break;
476
477 case AML_TO_BUFFER_OP: /* to_buffer (Data, Result) */
478
479 status = acpi_ex_convert_to_buffer(operand[0], &return_desc);
480 if (return_desc == operand[0]) {
481
482 /* No conversion performed, add ref to handle return value */
483
484 acpi_ut_add_reference(return_desc);
485 }
486 break;
487
488 case AML_TO_INTEGER_OP: /* to_integer (Data, Result) */
489
490 /* Perform "explicit" conversion */
491
492 status =
493 acpi_ex_convert_to_integer(operand[0], &return_desc, 0);
494 if (return_desc == operand[0]) {
495
496 /* No conversion performed, add ref to handle return value */
497
498 acpi_ut_add_reference(return_desc);
499 }
500 break;
501
502 case AML_SHIFT_LEFT_BIT_OP: /* shift_left_bit (Source, bit_num) */
503 case AML_SHIFT_RIGHT_BIT_OP: /* shift_right_bit (Source, bit_num) */
504
505 /* These are two obsolete opcodes */
506
507 ACPI_ERROR((AE_INFO,
508 "%s is obsolete and not implemented",
509 acpi_ps_get_opcode_name(walk_state->opcode)));
510 status = AE_SUPPORT;
511 goto cleanup;
512
513 default: /* Unknown opcode */
514
515 ACPI_ERROR((AE_INFO, "Unknown AML opcode 0x%X",
516 walk_state->opcode));
517 status = AE_AML_BAD_OPCODE;
518 goto cleanup;
519 }
520
521 if (ACPI_SUCCESS(status)) {
522
523 /* Store the return value computed above into the target object */
524
525 status = acpi_ex_store(return_desc, operand[1], walk_state);
526 }
527
528 cleanup:
529
530 /* Delete return object on error */
531
532 if (ACPI_FAILURE(status)) {
533 acpi_ut_remove_reference(return_desc);
534 }
535
536 /* Save return object on success */
537
538 else if (!walk_state->result_obj) {
539 walk_state->result_obj = return_desc;
540 }
541
542 return_ACPI_STATUS(status);
543 }
544
545 /*******************************************************************************
546 *
547 * FUNCTION: acpi_ex_opcode_1A_0T_1R
548 *
549 * PARAMETERS: walk_state - Current state (contains AML opcode)
550 *
551 * RETURN: Status
552 *
553 * DESCRIPTION: Execute opcode with one argument, no target, and a return value
554 *
555 ******************************************************************************/
556
acpi_ex_opcode_1A_0T_1R(struct acpi_walk_state * walk_state)557 acpi_status acpi_ex_opcode_1A_0T_1R(struct acpi_walk_state *walk_state)
558 {
559 union acpi_operand_object **operand = &walk_state->operands[0];
560 union acpi_operand_object *temp_desc;
561 union acpi_operand_object *return_desc = NULL;
562 acpi_status status = AE_OK;
563 u32 type;
564 u64 value;
565
566 ACPI_FUNCTION_TRACE_STR(ex_opcode_1A_0T_1R,
567 acpi_ps_get_opcode_name(walk_state->opcode));
568
569 /* Examine the AML opcode */
570
571 switch (walk_state->opcode) {
572 case AML_LOGICAL_NOT_OP: /* LNot (Operand) */
573
574 return_desc = acpi_ut_create_integer_object((u64) 0);
575 if (!return_desc) {
576 status = AE_NO_MEMORY;
577 goto cleanup;
578 }
579
580 /*
581 * Set result to ONES (TRUE) if Value == 0. Note:
582 * return_desc->Integer.Value is initially == 0 (FALSE) from above.
583 */
584 if (!operand[0]->integer.value) {
585 return_desc->integer.value = ACPI_UINT64_MAX;
586 }
587 break;
588
589 case AML_DECREMENT_OP: /* Decrement (Operand) */
590 case AML_INCREMENT_OP: /* Increment (Operand) */
591 /*
592 * Create a new integer. Can't just get the base integer and
593 * increment it because it may be an Arg or Field.
594 */
595 return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
596 if (!return_desc) {
597 status = AE_NO_MEMORY;
598 goto cleanup;
599 }
600
601 /*
602 * Since we are expecting a Reference operand, it can be either a
603 * NS Node or an internal object.
604 */
605 temp_desc = operand[0];
606 if (ACPI_GET_DESCRIPTOR_TYPE(temp_desc) ==
607 ACPI_DESC_TYPE_OPERAND) {
608
609 /* Internal reference object - prevent deletion */
610
611 acpi_ut_add_reference(temp_desc);
612 }
613
614 /*
615 * Convert the Reference operand to an Integer (This removes a
616 * reference on the Operand[0] object)
617 *
618 * NOTE: We use LNOT_OP here in order to force resolution of the
619 * reference operand to an actual integer.
620 */
621 status = acpi_ex_resolve_operands(AML_LOGICAL_NOT_OP,
622 &temp_desc, walk_state);
623 if (ACPI_FAILURE(status)) {
624 ACPI_EXCEPTION((AE_INFO, status,
625 "While resolving operands for [%s]",
626 acpi_ps_get_opcode_name(walk_state->
627 opcode)));
628
629 goto cleanup;
630 }
631
632 /*
633 * temp_desc is now guaranteed to be an Integer object --
634 * Perform the actual increment or decrement
635 */
636 if (walk_state->opcode == AML_INCREMENT_OP) {
637 return_desc->integer.value =
638 temp_desc->integer.value + 1;
639 } else {
640 return_desc->integer.value =
641 temp_desc->integer.value - 1;
642 }
643
644 /* Finished with this Integer object */
645
646 acpi_ut_remove_reference(temp_desc);
647
648 /*
649 * Store the result back (indirectly) through the original
650 * Reference object
651 */
652 status = acpi_ex_store(return_desc, operand[0], walk_state);
653 break;
654
655 case AML_OBJECT_TYPE_OP: /* object_type (source_object) */
656 /*
657 * Note: The operand is not resolved at this point because we want to
658 * get the associated object, not its value. For example, we don't
659 * want to resolve a field_unit to its value, we want the actual
660 * field_unit object.
661 */
662
663 /* Get the type of the base object */
664
665 status =
666 acpi_ex_resolve_multiple(walk_state, operand[0], &type,
667 NULL);
668 if (ACPI_FAILURE(status)) {
669 goto cleanup;
670 }
671
672 /* Allocate a descriptor to hold the type. */
673
674 return_desc = acpi_ut_create_integer_object((u64) type);
675 if (!return_desc) {
676 status = AE_NO_MEMORY;
677 goto cleanup;
678 }
679 break;
680
681 case AML_SIZE_OF_OP: /* size_of (source_object) */
682 /*
683 * Note: The operand is not resolved at this point because we want to
684 * get the associated object, not its value.
685 */
686
687 /* Get the base object */
688
689 status =
690 acpi_ex_resolve_multiple(walk_state, operand[0], &type,
691 &temp_desc);
692 if (ACPI_FAILURE(status)) {
693 goto cleanup;
694 }
695
696 /*
697 * The type of the base object must be integer, buffer, string, or
698 * package. All others are not supported.
699 *
700 * NOTE: Integer is not specifically supported by the ACPI spec,
701 * but is supported implicitly via implicit operand conversion.
702 * rather than bother with conversion, we just use the byte width
703 * global (4 or 8 bytes).
704 */
705 switch (type) {
706 case ACPI_TYPE_INTEGER:
707
708 value = acpi_gbl_integer_byte_width;
709 break;
710
711 case ACPI_TYPE_STRING:
712
713 value = temp_desc->string.length;
714 break;
715
716 case ACPI_TYPE_BUFFER:
717
718 /* Buffer arguments may not be evaluated at this point */
719
720 status = acpi_ds_get_buffer_arguments(temp_desc);
721 value = temp_desc->buffer.length;
722 break;
723
724 case ACPI_TYPE_PACKAGE:
725
726 /* Package arguments may not be evaluated at this point */
727
728 status = acpi_ds_get_package_arguments(temp_desc);
729 value = temp_desc->package.count;
730 break;
731
732 default:
733
734 ACPI_ERROR((AE_INFO,
735 "Operand must be Buffer/Integer/String/Package"
736 " - found type %s",
737 acpi_ut_get_type_name(type)));
738
739 status = AE_AML_OPERAND_TYPE;
740 goto cleanup;
741 }
742
743 if (ACPI_FAILURE(status)) {
744 goto cleanup;
745 }
746
747 /*
748 * Now that we have the size of the object, create a result
749 * object to hold the value
750 */
751 return_desc = acpi_ut_create_integer_object(value);
752 if (!return_desc) {
753 status = AE_NO_MEMORY;
754 goto cleanup;
755 }
756 break;
757
758 case AML_REF_OF_OP: /* ref_of (source_object) */
759
760 status =
761 acpi_ex_get_object_reference(operand[0], &return_desc,
762 walk_state);
763 if (ACPI_FAILURE(status)) {
764 goto cleanup;
765 }
766 break;
767
768 case AML_DEREF_OF_OP: /* deref_of (obj_reference | String) */
769
770 /* Check for a method local or argument, or standalone String */
771
772 if (ACPI_GET_DESCRIPTOR_TYPE(operand[0]) ==
773 ACPI_DESC_TYPE_NAMED) {
774 temp_desc =
775 acpi_ns_get_attached_object((struct
776 acpi_namespace_node *)
777 operand[0]);
778 if (temp_desc
779 && ((temp_desc->common.type == ACPI_TYPE_STRING)
780 || (temp_desc->common.type ==
781 ACPI_TYPE_LOCAL_REFERENCE))) {
782 operand[0] = temp_desc;
783 acpi_ut_add_reference(temp_desc);
784 } else {
785 status = AE_AML_OPERAND_TYPE;
786 goto cleanup;
787 }
788 } else {
789 switch ((operand[0])->common.type) {
790 case ACPI_TYPE_LOCAL_REFERENCE:
791 /*
792 * This is a deref_of (local_x | arg_x)
793 *
794 * Must resolve/dereference the local/arg reference first
795 */
796 switch (operand[0]->reference.class) {
797 case ACPI_REFCLASS_LOCAL:
798 case ACPI_REFCLASS_ARG:
799
800 /* Set Operand[0] to the value of the local/arg */
801
802 status =
803 acpi_ds_method_data_get_value
804 (operand[0]->reference.class,
805 operand[0]->reference.value,
806 walk_state, &temp_desc);
807 if (ACPI_FAILURE(status)) {
808 goto cleanup;
809 }
810
811 /*
812 * Delete our reference to the input object and
813 * point to the object just retrieved
814 */
815 acpi_ut_remove_reference(operand[0]);
816 operand[0] = temp_desc;
817 break;
818
819 case ACPI_REFCLASS_REFOF:
820
821 /* Get the object to which the reference refers */
822
823 temp_desc =
824 operand[0]->reference.object;
825 acpi_ut_remove_reference(operand[0]);
826 operand[0] = temp_desc;
827 break;
828
829 default:
830
831 /* Must be an Index op - handled below */
832 break;
833 }
834 break;
835
836 case ACPI_TYPE_STRING:
837
838 break;
839
840 default:
841
842 status = AE_AML_OPERAND_TYPE;
843 goto cleanup;
844 }
845 }
846
847 if (ACPI_GET_DESCRIPTOR_TYPE(operand[0]) !=
848 ACPI_DESC_TYPE_NAMED) {
849 if ((operand[0])->common.type == ACPI_TYPE_STRING) {
850 /*
851 * This is a deref_of (String). The string is a reference
852 * to a named ACPI object.
853 *
854 * 1) Find the owning Node
855 * 2) Dereference the node to an actual object. Could be a
856 * Field, so we need to resolve the node to a value.
857 */
858 status =
859 acpi_ns_get_node_unlocked(walk_state->
860 scope_info->scope.
861 node,
862 operand[0]->
863 string.pointer,
864 ACPI_NS_SEARCH_PARENT,
865 ACPI_CAST_INDIRECT_PTR
866 (struct
867 acpi_namespace_node,
868 &return_desc));
869 if (ACPI_FAILURE(status)) {
870 goto cleanup;
871 }
872
873 status =
874 acpi_ex_resolve_node_to_value
875 (ACPI_CAST_INDIRECT_PTR
876 (struct acpi_namespace_node, &return_desc),
877 walk_state);
878 goto cleanup;
879 }
880 }
881
882 /* Operand[0] may have changed from the code above */
883
884 if (ACPI_GET_DESCRIPTOR_TYPE(operand[0]) ==
885 ACPI_DESC_TYPE_NAMED) {
886 /*
887 * This is a deref_of (object_reference)
888 * Get the actual object from the Node (This is the dereference).
889 * This case may only happen when a local_x or arg_x is
890 * dereferenced above, or for references to device and
891 * thermal objects.
892 */
893 switch (((struct acpi_namespace_node *)operand[0])->
894 type) {
895 case ACPI_TYPE_DEVICE:
896 case ACPI_TYPE_THERMAL:
897
898 /* These types have no node subobject, return the NS node */
899
900 return_desc = operand[0];
901 break;
902
903 default:
904 /* For most types, get the object attached to the node */
905
906 return_desc = acpi_ns_get_attached_object((struct acpi_namespace_node *)operand[0]);
907 acpi_ut_add_reference(return_desc);
908 break;
909 }
910 } else {
911 /*
912 * This must be a reference object produced by either the
913 * Index() or ref_of() operator
914 */
915 switch (operand[0]->reference.class) {
916 case ACPI_REFCLASS_INDEX:
917 /*
918 * The target type for the Index operator must be
919 * either a Buffer or a Package
920 */
921 switch (operand[0]->reference.target_type) {
922 case ACPI_TYPE_BUFFER_FIELD:
923
924 temp_desc =
925 operand[0]->reference.object;
926
927 /*
928 * Create a new object that contains one element of the
929 * buffer -- the element pointed to by the index.
930 *
931 * NOTE: index into a buffer is NOT a pointer to a
932 * sub-buffer of the main buffer, it is only a pointer to a
933 * single element (byte) of the buffer!
934 *
935 * Since we are returning the value of the buffer at the
936 * indexed location, we don't need to add an additional
937 * reference to the buffer itself.
938 */
939 return_desc =
940 acpi_ut_create_integer_object((u64)
941 temp_desc->buffer.pointer[operand[0]->reference.value]);
942 if (!return_desc) {
943 status = AE_NO_MEMORY;
944 goto cleanup;
945 }
946 break;
947
948 case ACPI_TYPE_PACKAGE:
949 /*
950 * Return the referenced element of the package. We must
951 * add another reference to the referenced object, however.
952 */
953 return_desc =
954 *(operand[0]->reference.where);
955 if (!return_desc) {
956 /*
957 * Element is NULL, do not allow the dereference.
958 * This provides compatibility with other ACPI
959 * implementations.
960 */
961 return_ACPI_STATUS
962 (AE_AML_UNINITIALIZED_ELEMENT);
963 }
964
965 acpi_ut_add_reference(return_desc);
966 break;
967
968 default:
969
970 ACPI_ERROR((AE_INFO,
971 "Unknown Index TargetType 0x%X in reference object %p",
972 operand[0]->reference.
973 target_type, operand[0]));
974
975 status = AE_AML_OPERAND_TYPE;
976 goto cleanup;
977 }
978 break;
979
980 case ACPI_REFCLASS_REFOF:
981
982 return_desc = operand[0]->reference.object;
983
984 if (ACPI_GET_DESCRIPTOR_TYPE(return_desc) ==
985 ACPI_DESC_TYPE_NAMED) {
986 return_desc =
987 acpi_ns_get_attached_object((struct
988 acpi_namespace_node
989 *)
990 return_desc);
991 if (!return_desc) {
992 break;
993 }
994
995 /*
996 * June 2013:
997 * buffer_fields/field_units require additional resolution
998 */
999 switch (return_desc->common.type) {
1000 case ACPI_TYPE_BUFFER_FIELD:
1001 case ACPI_TYPE_LOCAL_REGION_FIELD:
1002 case ACPI_TYPE_LOCAL_BANK_FIELD:
1003 case ACPI_TYPE_LOCAL_INDEX_FIELD:
1004
1005 status =
1006 acpi_ex_read_data_from_field
1007 (walk_state, return_desc,
1008 &temp_desc);
1009 if (ACPI_FAILURE(status)) {
1010 return_ACPI_STATUS
1011 (status);
1012 }
1013
1014 return_desc = temp_desc;
1015 break;
1016
1017 default:
1018
1019 /* Add another reference to the object */
1020
1021 acpi_ut_add_reference
1022 (return_desc);
1023 break;
1024 }
1025 }
1026 break;
1027
1028 default:
1029
1030 ACPI_ERROR((AE_INFO,
1031 "Unknown class in reference(%p) - 0x%2.2X",
1032 operand[0],
1033 operand[0]->reference.class));
1034
1035 status = AE_TYPE;
1036 goto cleanup;
1037 }
1038 }
1039 break;
1040
1041 default:
1042
1043 ACPI_ERROR((AE_INFO, "Unknown AML opcode 0x%X",
1044 walk_state->opcode));
1045
1046 status = AE_AML_BAD_OPCODE;
1047 goto cleanup;
1048 }
1049
1050 cleanup:
1051
1052 /* Delete return object on error */
1053
1054 if (ACPI_FAILURE(status)) {
1055 acpi_ut_remove_reference(return_desc);
1056 }
1057
1058 /* Save return object on success */
1059
1060 else {
1061 walk_state->result_obj = return_desc;
1062 }
1063
1064 return_ACPI_STATUS(status);
1065 }
1066