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Merge branch 'docs-next' of git://git.lwn.net/linux-2.6
[mirror_ubuntu-hirsute-kernel.git] / drivers / acpi / acpica / exoparg1.c
1
2 /******************************************************************************
3 *
4 * Module Name: exoparg1 - AML execution - opcodes with 1 argument
5 *
6 *****************************************************************************/
7
8 /*
9 * Copyright (C) 2000 - 2010, Intel Corp.
10 * All rights reserved.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions, and the following disclaimer,
17 * without modification.
18 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
19 * substantially similar to the "NO WARRANTY" disclaimer below
20 * ("Disclaimer") and any redistribution must be conditioned upon
21 * including a substantially similar Disclaimer requirement for further
22 * binary redistribution.
23 * 3. Neither the names of the above-listed copyright holders nor the names
24 * of any contributors may be used to endorse or promote products derived
25 * from this software without specific prior written permission.
26 *
27 * Alternatively, this software may be distributed under the terms of the
28 * GNU General Public License ("GPL") version 2 as published by the Free
29 * Software Foundation.
30 *
31 * NO WARRANTY
32 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
33 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
34 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
35 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
36 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
37 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
38 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
39 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
40 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
41 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
42 * POSSIBILITY OF SUCH DAMAGES.
43 */
44
45 #include <acpi/acpi.h>
46 #include "accommon.h"
47 #include "acparser.h"
48 #include "acdispat.h"
49 #include "acinterp.h"
50 #include "amlcode.h"
51 #include "acnamesp.h"
52
53 #define _COMPONENT ACPI_EXECUTER
54 ACPI_MODULE_NAME("exoparg1")
55
56 /*!
57 * Naming convention for AML interpreter execution routines.
58 *
59 * The routines that begin execution of AML opcodes are named with a common
60 * convention based upon the number of arguments, the number of target operands,
61 * and whether or not a value is returned:
62 *
63 * AcpiExOpcode_xA_yT_zR
64 *
65 * Where:
66 *
67 * xA - ARGUMENTS: The number of arguments (input operands) that are
68 * required for this opcode type (0 through 6 args).
69 * yT - TARGETS: The number of targets (output operands) that are required
70 * for this opcode type (0, 1, or 2 targets).
71 * zR - RETURN VALUE: Indicates whether this opcode type returns a value
72 * as the function return (0 or 1).
73 *
74 * The AcpiExOpcode* functions are called via the Dispatcher component with
75 * fully resolved operands.
76 !*/
77 /*******************************************************************************
78 *
79 * FUNCTION: acpi_ex_opcode_0A_0T_1R
80 *
81 * PARAMETERS: walk_state - Current state (contains AML opcode)
82 *
83 * RETURN: Status
84 *
85 * DESCRIPTION: Execute operator with no operands, one return value
86 *
87 ******************************************************************************/
88 acpi_status acpi_ex_opcode_0A_0T_1R(struct acpi_walk_state *walk_state)
89 {
90 acpi_status status = AE_OK;
91 union acpi_operand_object *return_desc = NULL;
92
93 ACPI_FUNCTION_TRACE_STR(ex_opcode_0A_0T_1R,
94 acpi_ps_get_opcode_name(walk_state->opcode));
95
96 /* Examine the AML opcode */
97
98 switch (walk_state->opcode) {
99 case AML_TIMER_OP: /* Timer () */
100
101 /* Create a return object of type Integer */
102
103 return_desc =
104 acpi_ut_create_integer_object(acpi_os_get_timer());
105 if (!return_desc) {
106 status = AE_NO_MEMORY;
107 goto cleanup;
108 }
109 break;
110
111 default: /* Unknown opcode */
112
113 ACPI_ERROR((AE_INFO, "Unknown AML opcode 0x%X",
114 walk_state->opcode));
115 status = AE_AML_BAD_OPCODE;
116 break;
117 }
118
119 cleanup:
120
121 /* Delete return object on error */
122
123 if ((ACPI_FAILURE(status)) || walk_state->result_obj) {
124 acpi_ut_remove_reference(return_desc);
125 walk_state->result_obj = NULL;
126 } else {
127 /* Save the return value */
128
129 walk_state->result_obj = return_desc;
130 }
131
132 return_ACPI_STATUS(status);
133 }
134
135 /*******************************************************************************
136 *
137 * FUNCTION: acpi_ex_opcode_1A_0T_0R
138 *
139 * PARAMETERS: walk_state - Current state (contains AML opcode)
140 *
141 * RETURN: Status
142 *
143 * DESCRIPTION: Execute Type 1 monadic operator with numeric operand on
144 * object stack
145 *
146 ******************************************************************************/
147
148 acpi_status acpi_ex_opcode_1A_0T_0R(struct acpi_walk_state *walk_state)
149 {
150 union acpi_operand_object **operand = &walk_state->operands[0];
151 acpi_status status = AE_OK;
152
153 ACPI_FUNCTION_TRACE_STR(ex_opcode_1A_0T_0R,
154 acpi_ps_get_opcode_name(walk_state->opcode));
155
156 /* Examine the AML opcode */
157
158 switch (walk_state->opcode) {
159 case AML_RELEASE_OP: /* Release (mutex_object) */
160
161 status = acpi_ex_release_mutex(operand[0], walk_state);
162 break;
163
164 case AML_RESET_OP: /* Reset (event_object) */
165
166 status = acpi_ex_system_reset_event(operand[0]);
167 break;
168
169 case AML_SIGNAL_OP: /* Signal (event_object) */
170
171 status = acpi_ex_system_signal_event(operand[0]);
172 break;
173
174 case AML_SLEEP_OP: /* Sleep (msec_time) */
175
176 status = acpi_ex_system_do_sleep(operand[0]->integer.value);
177 break;
178
179 case AML_STALL_OP: /* Stall (usec_time) */
180
181 status =
182 acpi_ex_system_do_stall((u32) operand[0]->integer.value);
183 break;
184
185 case AML_UNLOAD_OP: /* Unload (Handle) */
186
187 status = acpi_ex_unload_table(operand[0]);
188 break;
189
190 default: /* Unknown opcode */
191
192 ACPI_ERROR((AE_INFO, "Unknown AML opcode 0x%X",
193 walk_state->opcode));
194 status = AE_AML_BAD_OPCODE;
195 break;
196 }
197
198 return_ACPI_STATUS(status);
199 }
200
201 /*******************************************************************************
202 *
203 * FUNCTION: acpi_ex_opcode_1A_1T_0R
204 *
205 * PARAMETERS: walk_state - Current state (contains AML opcode)
206 *
207 * RETURN: Status
208 *
209 * DESCRIPTION: Execute opcode with one argument, one target, and no
210 * return value.
211 *
212 ******************************************************************************/
213
214 acpi_status acpi_ex_opcode_1A_1T_0R(struct acpi_walk_state *walk_state)
215 {
216 acpi_status status = AE_OK;
217 union acpi_operand_object **operand = &walk_state->operands[0];
218
219 ACPI_FUNCTION_TRACE_STR(ex_opcode_1A_1T_0R,
220 acpi_ps_get_opcode_name(walk_state->opcode));
221
222 /* Examine the AML opcode */
223
224 switch (walk_state->opcode) {
225 case AML_LOAD_OP:
226
227 status = acpi_ex_load_op(operand[0], operand[1], walk_state);
228 break;
229
230 default: /* Unknown opcode */
231
232 ACPI_ERROR((AE_INFO, "Unknown AML opcode 0x%X",
233 walk_state->opcode));
234 status = AE_AML_BAD_OPCODE;
235 goto cleanup;
236 }
237
238 cleanup:
239
240 return_ACPI_STATUS(status);
241 }
242
243 /*******************************************************************************
244 *
245 * FUNCTION: acpi_ex_opcode_1A_1T_1R
246 *
247 * PARAMETERS: walk_state - Current state (contains AML opcode)
248 *
249 * RETURN: Status
250 *
251 * DESCRIPTION: Execute opcode with one argument, one target, and a
252 * return value.
253 *
254 ******************************************************************************/
255
256 acpi_status acpi_ex_opcode_1A_1T_1R(struct acpi_walk_state *walk_state)
257 {
258 acpi_status status = AE_OK;
259 union acpi_operand_object **operand = &walk_state->operands[0];
260 union acpi_operand_object *return_desc = NULL;
261 union acpi_operand_object *return_desc2 = NULL;
262 u32 temp32;
263 u32 i;
264 u64 power_of_ten;
265 u64 digit;
266
267 ACPI_FUNCTION_TRACE_STR(ex_opcode_1A_1T_1R,
268 acpi_ps_get_opcode_name(walk_state->opcode));
269
270 /* Examine the AML opcode */
271
272 switch (walk_state->opcode) {
273 case AML_BIT_NOT_OP:
274 case AML_FIND_SET_LEFT_BIT_OP:
275 case AML_FIND_SET_RIGHT_BIT_OP:
276 case AML_FROM_BCD_OP:
277 case AML_TO_BCD_OP:
278 case AML_COND_REF_OF_OP:
279
280 /* Create a return object of type Integer for these opcodes */
281
282 return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
283 if (!return_desc) {
284 status = AE_NO_MEMORY;
285 goto cleanup;
286 }
287
288 switch (walk_state->opcode) {
289 case AML_BIT_NOT_OP: /* Not (Operand, Result) */
290
291 return_desc->integer.value = ~operand[0]->integer.value;
292 break;
293
294 case AML_FIND_SET_LEFT_BIT_OP: /* find_set_left_bit (Operand, Result) */
295
296 return_desc->integer.value = operand[0]->integer.value;
297
298 /*
299 * Acpi specification describes Integer type as a little
300 * endian unsigned value, so this boundary condition is valid.
301 */
302 for (temp32 = 0; return_desc->integer.value &&
303 temp32 < ACPI_INTEGER_BIT_SIZE; ++temp32) {
304 return_desc->integer.value >>= 1;
305 }
306
307 return_desc->integer.value = temp32;
308 break;
309
310 case AML_FIND_SET_RIGHT_BIT_OP: /* find_set_right_bit (Operand, Result) */
311
312 return_desc->integer.value = operand[0]->integer.value;
313
314 /*
315 * The Acpi specification describes Integer type as a little
316 * endian unsigned value, so this boundary condition is valid.
317 */
318 for (temp32 = 0; return_desc->integer.value &&
319 temp32 < ACPI_INTEGER_BIT_SIZE; ++temp32) {
320 return_desc->integer.value <<= 1;
321 }
322
323 /* Since the bit position is one-based, subtract from 33 (65) */
324
325 return_desc->integer.value =
326 temp32 ==
327 0 ? 0 : (ACPI_INTEGER_BIT_SIZE + 1) - temp32;
328 break;
329
330 case AML_FROM_BCD_OP: /* from_bcd (BCDValue, Result) */
331
332 /*
333 * The 64-bit ACPI integer can hold 16 4-bit BCD characters
334 * (if table is 32-bit, integer can hold 8 BCD characters)
335 * Convert each 4-bit BCD value
336 */
337 power_of_ten = 1;
338 return_desc->integer.value = 0;
339 digit = operand[0]->integer.value;
340
341 /* Convert each BCD digit (each is one nybble wide) */
342
343 for (i = 0;
344 (i < acpi_gbl_integer_nybble_width) && (digit > 0);
345 i++) {
346
347 /* Get the least significant 4-bit BCD digit */
348
349 temp32 = ((u32) digit) & 0xF;
350
351 /* Check the range of the digit */
352
353 if (temp32 > 9) {
354 ACPI_ERROR((AE_INFO,
355 "BCD digit too large (not decimal): 0x%X",
356 temp32));
357
358 status = AE_AML_NUMERIC_OVERFLOW;
359 goto cleanup;
360 }
361
362 /* Sum the digit into the result with the current power of 10 */
363
364 return_desc->integer.value +=
365 (((u64) temp32) * power_of_ten);
366
367 /* Shift to next BCD digit */
368
369 digit >>= 4;
370
371 /* Next power of 10 */
372
373 power_of_ten *= 10;
374 }
375 break;
376
377 case AML_TO_BCD_OP: /* to_bcd (Operand, Result) */
378
379 return_desc->integer.value = 0;
380 digit = operand[0]->integer.value;
381
382 /* Each BCD digit is one nybble wide */
383
384 for (i = 0;
385 (i < acpi_gbl_integer_nybble_width) && (digit > 0);
386 i++) {
387 (void)acpi_ut_short_divide(digit, 10, &digit,
388 &temp32);
389
390 /*
391 * Insert the BCD digit that resides in the
392 * remainder from above
393 */
394 return_desc->integer.value |=
395 (((u64) temp32) << ACPI_MUL_4(i));
396 }
397
398 /* Overflow if there is any data left in Digit */
399
400 if (digit > 0) {
401 ACPI_ERROR((AE_INFO,
402 "Integer too large to convert to BCD: 0x%8.8X%8.8X",
403 ACPI_FORMAT_UINT64(operand[0]->
404 integer.value)));
405 status = AE_AML_NUMERIC_OVERFLOW;
406 goto cleanup;
407 }
408 break;
409
410 case AML_COND_REF_OF_OP: /* cond_ref_of (source_object, Result) */
411
412 /*
413 * This op is a little strange because the internal return value is
414 * different than the return value stored in the result descriptor
415 * (There are really two return values)
416 */
417 if ((struct acpi_namespace_node *)operand[0] ==
418 acpi_gbl_root_node) {
419 /*
420 * This means that the object does not exist in the namespace,
421 * return FALSE
422 */
423 return_desc->integer.value = 0;
424 goto cleanup;
425 }
426
427 /* Get the object reference, store it, and remove our reference */
428
429 status = acpi_ex_get_object_reference(operand[0],
430 &return_desc2,
431 walk_state);
432 if (ACPI_FAILURE(status)) {
433 goto cleanup;
434 }
435
436 status =
437 acpi_ex_store(return_desc2, operand[1], walk_state);
438 acpi_ut_remove_reference(return_desc2);
439
440 /* The object exists in the namespace, return TRUE */
441
442 return_desc->integer.value = ACPI_UINT64_MAX;
443 goto cleanup;
444
445 default:
446 /* No other opcodes get here */
447 break;
448 }
449 break;
450
451 case AML_STORE_OP: /* Store (Source, Target) */
452
453 /*
454 * A store operand is typically a number, string, buffer or lvalue
455 * Be careful about deleting the source object,
456 * since the object itself may have been stored.
457 */
458 status = acpi_ex_store(operand[0], operand[1], walk_state);
459 if (ACPI_FAILURE(status)) {
460 return_ACPI_STATUS(status);
461 }
462
463 /* It is possible that the Store already produced a return object */
464
465 if (!walk_state->result_obj) {
466 /*
467 * Normally, we would remove a reference on the Operand[0]
468 * parameter; But since it is being used as the internal return
469 * object (meaning we would normally increment it), the two
470 * cancel out, and we simply don't do anything.
471 */
472 walk_state->result_obj = operand[0];
473 walk_state->operands[0] = NULL; /* Prevent deletion */
474 }
475 return_ACPI_STATUS(status);
476
477 /*
478 * ACPI 2.0 Opcodes
479 */
480 case AML_COPY_OP: /* Copy (Source, Target) */
481
482 status =
483 acpi_ut_copy_iobject_to_iobject(operand[0], &return_desc,
484 walk_state);
485 break;
486
487 case AML_TO_DECSTRING_OP: /* to_decimal_string (Data, Result) */
488
489 status = acpi_ex_convert_to_string(operand[0], &return_desc,
490 ACPI_EXPLICIT_CONVERT_DECIMAL);
491 if (return_desc == operand[0]) {
492
493 /* No conversion performed, add ref to handle return value */
494 acpi_ut_add_reference(return_desc);
495 }
496 break;
497
498 case AML_TO_HEXSTRING_OP: /* to_hex_string (Data, Result) */
499
500 status = acpi_ex_convert_to_string(operand[0], &return_desc,
501 ACPI_EXPLICIT_CONVERT_HEX);
502 if (return_desc == operand[0]) {
503
504 /* No conversion performed, add ref to handle return value */
505 acpi_ut_add_reference(return_desc);
506 }
507 break;
508
509 case AML_TO_BUFFER_OP: /* to_buffer (Data, Result) */
510
511 status = acpi_ex_convert_to_buffer(operand[0], &return_desc);
512 if (return_desc == operand[0]) {
513
514 /* No conversion performed, add ref to handle return value */
515 acpi_ut_add_reference(return_desc);
516 }
517 break;
518
519 case AML_TO_INTEGER_OP: /* to_integer (Data, Result) */
520
521 status = acpi_ex_convert_to_integer(operand[0], &return_desc,
522 ACPI_ANY_BASE);
523 if (return_desc == operand[0]) {
524
525 /* No conversion performed, add ref to handle return value */
526 acpi_ut_add_reference(return_desc);
527 }
528 break;
529
530 case AML_SHIFT_LEFT_BIT_OP: /* shift_left_bit (Source, bit_num) */
531 case AML_SHIFT_RIGHT_BIT_OP: /* shift_right_bit (Source, bit_num) */
532
533 /* These are two obsolete opcodes */
534
535 ACPI_ERROR((AE_INFO,
536 "%s is obsolete and not implemented",
537 acpi_ps_get_opcode_name(walk_state->opcode)));
538 status = AE_SUPPORT;
539 goto cleanup;
540
541 default: /* Unknown opcode */
542
543 ACPI_ERROR((AE_INFO, "Unknown AML opcode 0x%X",
544 walk_state->opcode));
545 status = AE_AML_BAD_OPCODE;
546 goto cleanup;
547 }
548
549 if (ACPI_SUCCESS(status)) {
550
551 /* Store the return value computed above into the target object */
552
553 status = acpi_ex_store(return_desc, operand[1], walk_state);
554 }
555
556 cleanup:
557
558 /* Delete return object on error */
559
560 if (ACPI_FAILURE(status)) {
561 acpi_ut_remove_reference(return_desc);
562 }
563
564 /* Save return object on success */
565
566 else if (!walk_state->result_obj) {
567 walk_state->result_obj = return_desc;
568 }
569
570 return_ACPI_STATUS(status);
571 }
572
573 /*******************************************************************************
574 *
575 * FUNCTION: acpi_ex_opcode_1A_0T_1R
576 *
577 * PARAMETERS: walk_state - Current state (contains AML opcode)
578 *
579 * RETURN: Status
580 *
581 * DESCRIPTION: Execute opcode with one argument, no target, and a return value
582 *
583 ******************************************************************************/
584
585 acpi_status acpi_ex_opcode_1A_0T_1R(struct acpi_walk_state *walk_state)
586 {
587 union acpi_operand_object **operand = &walk_state->operands[0];
588 union acpi_operand_object *temp_desc;
589 union acpi_operand_object *return_desc = NULL;
590 acpi_status status = AE_OK;
591 u32 type;
592 u64 value;
593
594 ACPI_FUNCTION_TRACE_STR(ex_opcode_1A_0T_1R,
595 acpi_ps_get_opcode_name(walk_state->opcode));
596
597 /* Examine the AML opcode */
598
599 switch (walk_state->opcode) {
600 case AML_LNOT_OP: /* LNot (Operand) */
601
602 return_desc = acpi_ut_create_integer_object((u64) 0);
603 if (!return_desc) {
604 status = AE_NO_MEMORY;
605 goto cleanup;
606 }
607
608 /*
609 * Set result to ONES (TRUE) if Value == 0. Note:
610 * return_desc->Integer.Value is initially == 0 (FALSE) from above.
611 */
612 if (!operand[0]->integer.value) {
613 return_desc->integer.value = ACPI_UINT64_MAX;
614 }
615 break;
616
617 case AML_DECREMENT_OP: /* Decrement (Operand) */
618 case AML_INCREMENT_OP: /* Increment (Operand) */
619
620 /*
621 * Create a new integer. Can't just get the base integer and
622 * increment it because it may be an Arg or Field.
623 */
624 return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
625 if (!return_desc) {
626 status = AE_NO_MEMORY;
627 goto cleanup;
628 }
629
630 /*
631 * Since we are expecting a Reference operand, it can be either a
632 * NS Node or an internal object.
633 */
634 temp_desc = operand[0];
635 if (ACPI_GET_DESCRIPTOR_TYPE(temp_desc) ==
636 ACPI_DESC_TYPE_OPERAND) {
637
638 /* Internal reference object - prevent deletion */
639
640 acpi_ut_add_reference(temp_desc);
641 }
642
643 /*
644 * Convert the Reference operand to an Integer (This removes a
645 * reference on the Operand[0] object)
646 *
647 * NOTE: We use LNOT_OP here in order to force resolution of the
648 * reference operand to an actual integer.
649 */
650 status =
651 acpi_ex_resolve_operands(AML_LNOT_OP, &temp_desc,
652 walk_state);
653 if (ACPI_FAILURE(status)) {
654 ACPI_EXCEPTION((AE_INFO, status,
655 "While resolving operands for [%s]",
656 acpi_ps_get_opcode_name(walk_state->
657 opcode)));
658
659 goto cleanup;
660 }
661
662 /*
663 * temp_desc is now guaranteed to be an Integer object --
664 * Perform the actual increment or decrement
665 */
666 if (walk_state->opcode == AML_INCREMENT_OP) {
667 return_desc->integer.value =
668 temp_desc->integer.value + 1;
669 } else {
670 return_desc->integer.value =
671 temp_desc->integer.value - 1;
672 }
673
674 /* Finished with this Integer object */
675
676 acpi_ut_remove_reference(temp_desc);
677
678 /*
679 * Store the result back (indirectly) through the original
680 * Reference object
681 */
682 status = acpi_ex_store(return_desc, operand[0], walk_state);
683 break;
684
685 case AML_TYPE_OP: /* object_type (source_object) */
686
687 /*
688 * Note: The operand is not resolved at this point because we want to
689 * get the associated object, not its value. For example, we don't
690 * want to resolve a field_unit to its value, we want the actual
691 * field_unit object.
692 */
693
694 /* Get the type of the base object */
695
696 status =
697 acpi_ex_resolve_multiple(walk_state, operand[0], &type,
698 NULL);
699 if (ACPI_FAILURE(status)) {
700 goto cleanup;
701 }
702
703 /* Allocate a descriptor to hold the type. */
704
705 return_desc = acpi_ut_create_integer_object((u64) type);
706 if (!return_desc) {
707 status = AE_NO_MEMORY;
708 goto cleanup;
709 }
710 break;
711
712 case AML_SIZE_OF_OP: /* size_of (source_object) */
713
714 /*
715 * Note: The operand is not resolved at this point because we want to
716 * get the associated object, not its value.
717 */
718
719 /* Get the base object */
720
721 status = acpi_ex_resolve_multiple(walk_state,
722 operand[0], &type,
723 &temp_desc);
724 if (ACPI_FAILURE(status)) {
725 goto cleanup;
726 }
727
728 /*
729 * The type of the base object must be integer, buffer, string, or
730 * package. All others are not supported.
731 *
732 * NOTE: Integer is not specifically supported by the ACPI spec,
733 * but is supported implicitly via implicit operand conversion.
734 * rather than bother with conversion, we just use the byte width
735 * global (4 or 8 bytes).
736 */
737 switch (type) {
738 case ACPI_TYPE_INTEGER:
739 value = acpi_gbl_integer_byte_width;
740 break;
741
742 case ACPI_TYPE_STRING:
743 value = temp_desc->string.length;
744 break;
745
746 case ACPI_TYPE_BUFFER:
747
748 /* Buffer arguments may not be evaluated at this point */
749
750 status = acpi_ds_get_buffer_arguments(temp_desc);
751 value = temp_desc->buffer.length;
752 break;
753
754 case ACPI_TYPE_PACKAGE:
755
756 /* Package arguments may not be evaluated at this point */
757
758 status = acpi_ds_get_package_arguments(temp_desc);
759 value = temp_desc->package.count;
760 break;
761
762 default:
763 ACPI_ERROR((AE_INFO,
764 "Operand must be Buffer/Integer/String/Package - found type %s",
765 acpi_ut_get_type_name(type)));
766 status = AE_AML_OPERAND_TYPE;
767 goto cleanup;
768 }
769
770 if (ACPI_FAILURE(status)) {
771 goto cleanup;
772 }
773
774 /*
775 * Now that we have the size of the object, create a result
776 * object to hold the value
777 */
778 return_desc = acpi_ut_create_integer_object(value);
779 if (!return_desc) {
780 status = AE_NO_MEMORY;
781 goto cleanup;
782 }
783 break;
784
785 case AML_REF_OF_OP: /* ref_of (source_object) */
786
787 status =
788 acpi_ex_get_object_reference(operand[0], &return_desc,
789 walk_state);
790 if (ACPI_FAILURE(status)) {
791 goto cleanup;
792 }
793 break;
794
795 case AML_DEREF_OF_OP: /* deref_of (obj_reference | String) */
796
797 /* Check for a method local or argument, or standalone String */
798
799 if (ACPI_GET_DESCRIPTOR_TYPE(operand[0]) ==
800 ACPI_DESC_TYPE_NAMED) {
801 temp_desc =
802 acpi_ns_get_attached_object((struct
803 acpi_namespace_node *)
804 operand[0]);
805 if (temp_desc
806 && ((temp_desc->common.type == ACPI_TYPE_STRING)
807 || (temp_desc->common.type ==
808 ACPI_TYPE_LOCAL_REFERENCE))) {
809 operand[0] = temp_desc;
810 acpi_ut_add_reference(temp_desc);
811 } else {
812 status = AE_AML_OPERAND_TYPE;
813 goto cleanup;
814 }
815 } else {
816 switch ((operand[0])->common.type) {
817 case ACPI_TYPE_LOCAL_REFERENCE:
818 /*
819 * This is a deref_of (local_x | arg_x)
820 *
821 * Must resolve/dereference the local/arg reference first
822 */
823 switch (operand[0]->reference.class) {
824 case ACPI_REFCLASS_LOCAL:
825 case ACPI_REFCLASS_ARG:
826
827 /* Set Operand[0] to the value of the local/arg */
828
829 status =
830 acpi_ds_method_data_get_value
831 (operand[0]->reference.class,
832 operand[0]->reference.value,
833 walk_state, &temp_desc);
834 if (ACPI_FAILURE(status)) {
835 goto cleanup;
836 }
837
838 /*
839 * Delete our reference to the input object and
840 * point to the object just retrieved
841 */
842 acpi_ut_remove_reference(operand[0]);
843 operand[0] = temp_desc;
844 break;
845
846 case ACPI_REFCLASS_REFOF:
847
848 /* Get the object to which the reference refers */
849
850 temp_desc =
851 operand[0]->reference.object;
852 acpi_ut_remove_reference(operand[0]);
853 operand[0] = temp_desc;
854 break;
855
856 default:
857
858 /* Must be an Index op - handled below */
859 break;
860 }
861 break;
862
863 case ACPI_TYPE_STRING:
864 break;
865
866 default:
867 status = AE_AML_OPERAND_TYPE;
868 goto cleanup;
869 }
870 }
871
872 if (ACPI_GET_DESCRIPTOR_TYPE(operand[0]) !=
873 ACPI_DESC_TYPE_NAMED) {
874 if ((operand[0])->common.type == ACPI_TYPE_STRING) {
875 /*
876 * This is a deref_of (String). The string is a reference
877 * to a named ACPI object.
878 *
879 * 1) Find the owning Node
880 * 2) Dereference the node to an actual object. Could be a
881 * Field, so we need to resolve the node to a value.
882 */
883 status =
884 acpi_ns_get_node(walk_state->scope_info->
885 scope.node,
886 operand[0]->string.pointer,
887 ACPI_NS_SEARCH_PARENT,
888 ACPI_CAST_INDIRECT_PTR
889 (struct
890 acpi_namespace_node,
891 &return_desc));
892 if (ACPI_FAILURE(status)) {
893 goto cleanup;
894 }
895
896 status =
897 acpi_ex_resolve_node_to_value
898 (ACPI_CAST_INDIRECT_PTR
899 (struct acpi_namespace_node, &return_desc),
900 walk_state);
901 goto cleanup;
902 }
903 }
904
905 /* Operand[0] may have changed from the code above */
906
907 if (ACPI_GET_DESCRIPTOR_TYPE(operand[0]) ==
908 ACPI_DESC_TYPE_NAMED) {
909 /*
910 * This is a deref_of (object_reference)
911 * Get the actual object from the Node (This is the dereference).
912 * This case may only happen when a local_x or arg_x is
913 * dereferenced above.
914 */
915 return_desc = acpi_ns_get_attached_object((struct
916 acpi_namespace_node
917 *)
918 operand[0]);
919 acpi_ut_add_reference(return_desc);
920 } else {
921 /*
922 * This must be a reference object produced by either the
923 * Index() or ref_of() operator
924 */
925 switch (operand[0]->reference.class) {
926 case ACPI_REFCLASS_INDEX:
927
928 /*
929 * The target type for the Index operator must be
930 * either a Buffer or a Package
931 */
932 switch (operand[0]->reference.target_type) {
933 case ACPI_TYPE_BUFFER_FIELD:
934
935 temp_desc =
936 operand[0]->reference.object;
937
938 /*
939 * Create a new object that contains one element of the
940 * buffer -- the element pointed to by the index.
941 *
942 * NOTE: index into a buffer is NOT a pointer to a
943 * sub-buffer of the main buffer, it is only a pointer to a
944 * single element (byte) of the buffer!
945 *
946 * Since we are returning the value of the buffer at the
947 * indexed location, we don't need to add an additional
948 * reference to the buffer itself.
949 */
950 return_desc =
951 acpi_ut_create_integer_object((u64)
952 temp_desc->
953 buffer.
954 pointer
955 [operand
956 [0]->
957 reference.
958 value]);
959 if (!return_desc) {
960 status = AE_NO_MEMORY;
961 goto cleanup;
962 }
963 break;
964
965 case ACPI_TYPE_PACKAGE:
966
967 /*
968 * Return the referenced element of the package. We must
969 * add another reference to the referenced object, however.
970 */
971 return_desc =
972 *(operand[0]->reference.where);
973 if (return_desc) {
974 acpi_ut_add_reference
975 (return_desc);
976 }
977 break;
978
979 default:
980
981 ACPI_ERROR((AE_INFO,
982 "Unknown Index TargetType 0x%X in reference object %p",
983 operand[0]->reference.
984 target_type, operand[0]));
985 status = AE_AML_OPERAND_TYPE;
986 goto cleanup;
987 }
988 break;
989
990 case ACPI_REFCLASS_REFOF:
991
992 return_desc = operand[0]->reference.object;
993
994 if (ACPI_GET_DESCRIPTOR_TYPE(return_desc) ==
995 ACPI_DESC_TYPE_NAMED) {
996 return_desc =
997 acpi_ns_get_attached_object((struct
998 acpi_namespace_node
999 *)
1000 return_desc);
1001 }
1002
1003 /* Add another reference to the object! */
1004
1005 acpi_ut_add_reference(return_desc);
1006 break;
1007
1008 default:
1009 ACPI_ERROR((AE_INFO,
1010 "Unknown class in reference(%p) - 0x%2.2X",
1011 operand[0],
1012 operand[0]->reference.class));
1013
1014 status = AE_TYPE;
1015 goto cleanup;
1016 }
1017 }
1018 break;
1019
1020 default:
1021
1022 ACPI_ERROR((AE_INFO, "Unknown AML opcode 0x%X",
1023 walk_state->opcode));
1024 status = AE_AML_BAD_OPCODE;
1025 goto cleanup;
1026 }
1027
1028 cleanup:
1029
1030 /* Delete return object on error */
1031
1032 if (ACPI_FAILURE(status)) {
1033 acpi_ut_remove_reference(return_desc);
1034 }
1035
1036 /* Save return object on success */
1037
1038 else {
1039 walk_state->result_obj = return_desc;
1040 }
1041
1042 return_ACPI_STATUS(status);
1043 }
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