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Merge remote-tracking branch 'selinux/next'
[deliverable/linux.git] / drivers / acpi / acpica / exoparg1.c
1 /******************************************************************************
2 *
3 * Module Name: exoparg1 - AML execution - opcodes with 1 argument
4 *
5 *****************************************************************************/
6
7 /*
8 * Copyright (C) 2000 - 2016, Intel Corp.
9 * All rights reserved.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions, and the following disclaimer,
16 * without modification.
17 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
18 * substantially similar to the "NO WARRANTY" disclaimer below
19 * ("Disclaimer") and any redistribution must be conditioned upon
20 * including a substantially similar Disclaimer requirement for further
21 * binary redistribution.
22 * 3. Neither the names of the above-listed copyright holders nor the names
23 * of any contributors may be used to endorse or promote products derived
24 * from this software without specific prior written permission.
25 *
26 * Alternatively, this software may be distributed under the terms of the
27 * GNU General Public License ("GPL") version 2 as published by the Free
28 * Software Foundation.
29 *
30 * NO WARRANTY
31 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
32 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
33 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
34 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
35 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
36 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
37 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
38 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
39 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
40 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
41 * POSSIBILITY OF SUCH DAMAGES.
42 */
43
44 #include <acpi/acpi.h>
45 #include "accommon.h"
46 #include "acparser.h"
47 #include "acdispat.h"
48 #include "acinterp.h"
49 #include "amlcode.h"
50 #include "acnamesp.h"
51
52 #define _COMPONENT ACPI_EXECUTER
53 ACPI_MODULE_NAME("exoparg1")
54
55 /*!
56 * Naming convention for AML interpreter execution routines.
57 *
58 * The routines that begin execution of AML opcodes are named with a common
59 * convention based upon the number of arguments, the number of target operands,
60 * and whether or not a value is returned:
61 *
62 * AcpiExOpcode_xA_yT_zR
63 *
64 * Where:
65 *
66 * xA - ARGUMENTS: The number of arguments (input operands) that are
67 * required for this opcode type (0 through 6 args).
68 * yT - TARGETS: The number of targets (output operands) that are required
69 * for this opcode type (0, 1, or 2 targets).
70 * zR - RETURN VALUE: Indicates whether this opcode type returns a value
71 * as the function return (0 or 1).
72 *
73 * The AcpiExOpcode* functions are called via the Dispatcher component with
74 * fully resolved operands.
75 !*/
76 /*******************************************************************************
77 *
78 * FUNCTION: acpi_ex_opcode_0A_0T_1R
79 *
80 * PARAMETERS: walk_state - Current state (contains AML opcode)
81 *
82 * RETURN: Status
83 *
84 * DESCRIPTION: Execute operator with no operands, one return value
85 *
86 ******************************************************************************/
87 acpi_status acpi_ex_opcode_0A_0T_1R(struct acpi_walk_state *walk_state)
88 {
89 acpi_status status = AE_OK;
90 union acpi_operand_object *return_desc = NULL;
91
92 ACPI_FUNCTION_TRACE_STR(ex_opcode_0A_0T_1R,
93 acpi_ps_get_opcode_name(walk_state->opcode));
94
95 /* Examine the AML opcode */
96
97 switch (walk_state->opcode) {
98 case AML_TIMER_OP: /* Timer () */
99
100 /* Create a return object of type Integer */
101
102 return_desc =
103 acpi_ut_create_integer_object(acpi_os_get_timer());
104 if (!return_desc) {
105 status = AE_NO_MEMORY;
106 goto cleanup;
107 }
108 break;
109
110 default: /* Unknown opcode */
111
112 ACPI_ERROR((AE_INFO, "Unknown AML opcode 0x%X",
113 walk_state->opcode));
114 status = AE_AML_BAD_OPCODE;
115 break;
116 }
117
118 cleanup:
119
120 /* Delete return object on error */
121
122 if ((ACPI_FAILURE(status)) || walk_state->result_obj) {
123 acpi_ut_remove_reference(return_desc);
124 walk_state->result_obj = NULL;
125 } else {
126 /* Save the return value */
127
128 walk_state->result_obj = return_desc;
129 }
130
131 return_ACPI_STATUS(status);
132 }
133
134 /*******************************************************************************
135 *
136 * FUNCTION: acpi_ex_opcode_1A_0T_0R
137 *
138 * PARAMETERS: walk_state - Current state (contains AML opcode)
139 *
140 * RETURN: Status
141 *
142 * DESCRIPTION: Execute Type 1 monadic operator with numeric operand on
143 * object stack
144 *
145 ******************************************************************************/
146
147 acpi_status acpi_ex_opcode_1A_0T_0R(struct acpi_walk_state *walk_state)
148 {
149 union acpi_operand_object **operand = &walk_state->operands[0];
150 acpi_status status = AE_OK;
151
152 ACPI_FUNCTION_TRACE_STR(ex_opcode_1A_0T_0R,
153 acpi_ps_get_opcode_name(walk_state->opcode));
154
155 /* Examine the AML opcode */
156
157 switch (walk_state->opcode) {
158 case AML_RELEASE_OP: /* Release (mutex_object) */
159
160 status = acpi_ex_release_mutex(operand[0], walk_state);
161 break;
162
163 case AML_RESET_OP: /* Reset (event_object) */
164
165 status = acpi_ex_system_reset_event(operand[0]);
166 break;
167
168 case AML_SIGNAL_OP: /* Signal (event_object) */
169
170 status = acpi_ex_system_signal_event(operand[0]);
171 break;
172
173 case AML_SLEEP_OP: /* Sleep (msec_time) */
174
175 status = acpi_ex_system_do_sleep(operand[0]->integer.value);
176 break;
177
178 case AML_STALL_OP: /* Stall (usec_time) */
179
180 status =
181 acpi_ex_system_do_stall((u32) operand[0]->integer.value);
182 break;
183
184 case AML_UNLOAD_OP: /* Unload (Handle) */
185
186 status = acpi_ex_unload_table(operand[0]);
187 break;
188
189 default: /* Unknown opcode */
190
191 ACPI_ERROR((AE_INFO, "Unknown AML opcode 0x%X",
192 walk_state->opcode));
193 status = AE_AML_BAD_OPCODE;
194 break;
195 }
196
197 return_ACPI_STATUS(status);
198 }
199
200 /*******************************************************************************
201 *
202 * FUNCTION: acpi_ex_opcode_1A_1T_0R
203 *
204 * PARAMETERS: walk_state - Current state (contains AML opcode)
205 *
206 * RETURN: Status
207 *
208 * DESCRIPTION: Execute opcode with one argument, one target, and no
209 * return value.
210 *
211 ******************************************************************************/
212
213 acpi_status acpi_ex_opcode_1A_1T_0R(struct acpi_walk_state *walk_state)
214 {
215 acpi_status status = AE_OK;
216 union acpi_operand_object **operand = &walk_state->operands[0];
217
218 ACPI_FUNCTION_TRACE_STR(ex_opcode_1A_1T_0R,
219 acpi_ps_get_opcode_name(walk_state->opcode));
220
221 /* Examine the AML opcode */
222
223 switch (walk_state->opcode) {
224 case AML_LOAD_OP:
225
226 status = acpi_ex_load_op(operand[0], operand[1], walk_state);
227 break;
228
229 default: /* Unknown opcode */
230
231 ACPI_ERROR((AE_INFO, "Unknown AML opcode 0x%X",
232 walk_state->opcode));
233 status = AE_AML_BAD_OPCODE;
234 goto cleanup;
235 }
236
237 cleanup:
238
239 return_ACPI_STATUS(status);
240 }
241
242 /*******************************************************************************
243 *
244 * FUNCTION: acpi_ex_opcode_1A_1T_1R
245 *
246 * PARAMETERS: walk_state - Current state (contains AML opcode)
247 *
248 * RETURN: Status
249 *
250 * DESCRIPTION: Execute opcode with one argument, one target, and a
251 * return value.
252 *
253 ******************************************************************************/
254
255 acpi_status acpi_ex_opcode_1A_1T_1R(struct acpi_walk_state *walk_state)
256 {
257 acpi_status status = AE_OK;
258 union acpi_operand_object **operand = &walk_state->operands[0];
259 union acpi_operand_object *return_desc = NULL;
260 union acpi_operand_object *return_desc2 = NULL;
261 u32 temp32;
262 u32 i;
263 u64 power_of_ten;
264 u64 digit;
265
266 ACPI_FUNCTION_TRACE_STR(ex_opcode_1A_1T_1R,
267 acpi_ps_get_opcode_name(walk_state->opcode));
268
269 /* Examine the AML opcode */
270
271 switch (walk_state->opcode) {
272 case AML_BIT_NOT_OP:
273 case AML_FIND_SET_LEFT_BIT_OP:
274 case AML_FIND_SET_RIGHT_BIT_OP:
275 case AML_FROM_BCD_OP:
276 case AML_TO_BCD_OP:
277 case AML_COND_REF_OF_OP:
278
279 /* Create a return object of type Integer for these opcodes */
280
281 return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
282 if (!return_desc) {
283 status = AE_NO_MEMORY;
284 goto cleanup;
285 }
286
287 switch (walk_state->opcode) {
288 case AML_BIT_NOT_OP: /* Not (Operand, Result) */
289
290 return_desc->integer.value = ~operand[0]->integer.value;
291 break;
292
293 case AML_FIND_SET_LEFT_BIT_OP: /* find_set_left_bit (Operand, Result) */
294
295 return_desc->integer.value = operand[0]->integer.value;
296
297 /*
298 * Acpi specification describes Integer type as a little
299 * endian unsigned value, so this boundary condition is valid.
300 */
301 for (temp32 = 0; return_desc->integer.value &&
302 temp32 < ACPI_INTEGER_BIT_SIZE; ++temp32) {
303 return_desc->integer.value >>= 1;
304 }
305
306 return_desc->integer.value = temp32;
307 break;
308
309 case AML_FIND_SET_RIGHT_BIT_OP: /* find_set_right_bit (Operand, Result) */
310
311 return_desc->integer.value = operand[0]->integer.value;
312
313 /*
314 * The Acpi specification describes Integer type as a little
315 * endian unsigned value, so this boundary condition is valid.
316 */
317 for (temp32 = 0; return_desc->integer.value &&
318 temp32 < ACPI_INTEGER_BIT_SIZE; ++temp32) {
319 return_desc->integer.value <<= 1;
320 }
321
322 /* Since the bit position is one-based, subtract from 33 (65) */
323
324 return_desc->integer.value =
325 temp32 ==
326 0 ? 0 : (ACPI_INTEGER_BIT_SIZE + 1) - temp32;
327 break;
328
329 case AML_FROM_BCD_OP: /* from_bcd (BCDValue, Result) */
330 /*
331 * The 64-bit ACPI integer can hold 16 4-bit BCD characters
332 * (if table is 32-bit, integer can hold 8 BCD characters)
333 * Convert each 4-bit BCD value
334 */
335 power_of_ten = 1;
336 return_desc->integer.value = 0;
337 digit = operand[0]->integer.value;
338
339 /* Convert each BCD digit (each is one nybble wide) */
340
341 for (i = 0;
342 (i < acpi_gbl_integer_nybble_width) && (digit > 0);
343 i++) {
344
345 /* Get the least significant 4-bit BCD digit */
346
347 temp32 = ((u32) digit) & 0xF;
348
349 /* Check the range of the digit */
350
351 if (temp32 > 9) {
352 ACPI_ERROR((AE_INFO,
353 "BCD digit too large (not decimal): 0x%X",
354 temp32));
355
356 status = AE_AML_NUMERIC_OVERFLOW;
357 goto cleanup;
358 }
359
360 /* Sum the digit into the result with the current power of 10 */
361
362 return_desc->integer.value +=
363 (((u64) temp32) * power_of_ten);
364
365 /* Shift to next BCD digit */
366
367 digit >>= 4;
368
369 /* Next power of 10 */
370
371 power_of_ten *= 10;
372 }
373 break;
374
375 case AML_TO_BCD_OP: /* to_bcd (Operand, Result) */
376
377 return_desc->integer.value = 0;
378 digit = operand[0]->integer.value;
379
380 /* Each BCD digit is one nybble wide */
381
382 for (i = 0;
383 (i < acpi_gbl_integer_nybble_width) && (digit > 0);
384 i++) {
385 (void)acpi_ut_short_divide(digit, 10, &digit,
386 &temp32);
387
388 /*
389 * Insert the BCD digit that resides in the
390 * remainder from above
391 */
392 return_desc->integer.value |=
393 (((u64) temp32) << ACPI_MUL_4(i));
394 }
395
396 /* Overflow if there is any data left in Digit */
397
398 if (digit > 0) {
399 ACPI_ERROR((AE_INFO,
400 "Integer too large to convert to BCD: 0x%8.8X%8.8X",
401 ACPI_FORMAT_UINT64(operand[0]->
402 integer.value)));
403 status = AE_AML_NUMERIC_OVERFLOW;
404 goto cleanup;
405 }
406 break;
407
408 case AML_COND_REF_OF_OP: /* cond_ref_of (source_object, Result) */
409 /*
410 * This op is a little strange because the internal return value is
411 * different than the return value stored in the result descriptor
412 * (There are really two return values)
413 */
414 if ((struct acpi_namespace_node *)operand[0] ==
415 acpi_gbl_root_node) {
416 /*
417 * This means that the object does not exist in the namespace,
418 * return FALSE
419 */
420 return_desc->integer.value = 0;
421 goto cleanup;
422 }
423
424 /* Get the object reference, store it, and remove our reference */
425
426 status = acpi_ex_get_object_reference(operand[0],
427 &return_desc2,
428 walk_state);
429 if (ACPI_FAILURE(status)) {
430 goto cleanup;
431 }
432
433 status =
434 acpi_ex_store(return_desc2, operand[1], walk_state);
435 acpi_ut_remove_reference(return_desc2);
436
437 /* The object exists in the namespace, return TRUE */
438
439 return_desc->integer.value = ACPI_UINT64_MAX;
440 goto cleanup;
441
442 default:
443
444 /* No other opcodes get here */
445
446 break;
447 }
448 break;
449
450 case AML_STORE_OP: /* Store (Source, Target) */
451 /*
452 * A store operand is typically a number, string, buffer or lvalue
453 * Be careful about deleting the source object,
454 * since the object itself may have been stored.
455 */
456 status = acpi_ex_store(operand[0], operand[1], walk_state);
457 if (ACPI_FAILURE(status)) {
458 return_ACPI_STATUS(status);
459 }
460
461 /* It is possible that the Store already produced a return object */
462
463 if (!walk_state->result_obj) {
464 /*
465 * Normally, we would remove a reference on the Operand[0]
466 * parameter; But since it is being used as the internal return
467 * object (meaning we would normally increment it), the two
468 * cancel out, and we simply don't do anything.
469 */
470 walk_state->result_obj = operand[0];
471 walk_state->operands[0] = NULL; /* Prevent deletion */
472 }
473 return_ACPI_STATUS(status);
474
475 /*
476 * ACPI 2.0 Opcodes
477 */
478 case AML_COPY_OP: /* Copy (Source, Target) */
479
480 status =
481 acpi_ut_copy_iobject_to_iobject(operand[0], &return_desc,
482 walk_state);
483 break;
484
485 case AML_TO_DECSTRING_OP: /* to_decimal_string (Data, Result) */
486
487 status =
488 acpi_ex_convert_to_string(operand[0], &return_desc,
489 ACPI_EXPLICIT_CONVERT_DECIMAL);
490 if (return_desc == operand[0]) {
491
492 /* No conversion performed, add ref to handle return value */
493
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 =
501 acpi_ex_convert_to_string(operand[0], &return_desc,
502 ACPI_EXPLICIT_CONVERT_HEX);
503 if (return_desc == operand[0]) {
504
505 /* No conversion performed, add ref to handle return value */
506
507 acpi_ut_add_reference(return_desc);
508 }
509 break;
510
511 case AML_TO_BUFFER_OP: /* to_buffer (Data, Result) */
512
513 status = acpi_ex_convert_to_buffer(operand[0], &return_desc);
514 if (return_desc == operand[0]) {
515
516 /* No conversion performed, add ref to handle return value */
517
518 acpi_ut_add_reference(return_desc);
519 }
520 break;
521
522 case AML_TO_INTEGER_OP: /* to_integer (Data, Result) */
523
524 /* Perform "explicit" conversion */
525
526 status =
527 acpi_ex_convert_to_integer(operand[0], &return_desc, 0);
528 if (return_desc == operand[0]) {
529
530 /* No conversion performed, add ref to handle return value */
531
532 acpi_ut_add_reference(return_desc);
533 }
534 break;
535
536 case AML_SHIFT_LEFT_BIT_OP: /* shift_left_bit (Source, bit_num) */
537 case AML_SHIFT_RIGHT_BIT_OP: /* shift_right_bit (Source, bit_num) */
538
539 /* These are two obsolete opcodes */
540
541 ACPI_ERROR((AE_INFO,
542 "%s is obsolete and not implemented",
543 acpi_ps_get_opcode_name(walk_state->opcode)));
544 status = AE_SUPPORT;
545 goto cleanup;
546
547 default: /* Unknown opcode */
548
549 ACPI_ERROR((AE_INFO, "Unknown AML opcode 0x%X",
550 walk_state->opcode));
551 status = AE_AML_BAD_OPCODE;
552 goto cleanup;
553 }
554
555 if (ACPI_SUCCESS(status)) {
556
557 /* Store the return value computed above into the target object */
558
559 status = acpi_ex_store(return_desc, operand[1], walk_state);
560 }
561
562 cleanup:
563
564 /* Delete return object on error */
565
566 if (ACPI_FAILURE(status)) {
567 acpi_ut_remove_reference(return_desc);
568 }
569
570 /* Save return object on success */
571
572 else if (!walk_state->result_obj) {
573 walk_state->result_obj = return_desc;
574 }
575
576 return_ACPI_STATUS(status);
577 }
578
579 /*******************************************************************************
580 *
581 * FUNCTION: acpi_ex_opcode_1A_0T_1R
582 *
583 * PARAMETERS: walk_state - Current state (contains AML opcode)
584 *
585 * RETURN: Status
586 *
587 * DESCRIPTION: Execute opcode with one argument, no target, and a return value
588 *
589 ******************************************************************************/
590
591 acpi_status acpi_ex_opcode_1A_0T_1R(struct acpi_walk_state *walk_state)
592 {
593 union acpi_operand_object **operand = &walk_state->operands[0];
594 union acpi_operand_object *temp_desc;
595 union acpi_operand_object *return_desc = NULL;
596 acpi_status status = AE_OK;
597 u32 type;
598 u64 value;
599
600 ACPI_FUNCTION_TRACE_STR(ex_opcode_1A_0T_1R,
601 acpi_ps_get_opcode_name(walk_state->opcode));
602
603 /* Examine the AML opcode */
604
605 switch (walk_state->opcode) {
606 case AML_LNOT_OP: /* LNot (Operand) */
607
608 return_desc = acpi_ut_create_integer_object((u64) 0);
609 if (!return_desc) {
610 status = AE_NO_MEMORY;
611 goto cleanup;
612 }
613
614 /*
615 * Set result to ONES (TRUE) if Value == 0. Note:
616 * return_desc->Integer.Value is initially == 0 (FALSE) from above.
617 */
618 if (!operand[0]->integer.value) {
619 return_desc->integer.value = ACPI_UINT64_MAX;
620 }
621 break;
622
623 case AML_DECREMENT_OP: /* Decrement (Operand) */
624 case AML_INCREMENT_OP: /* Increment (Operand) */
625 /*
626 * Create a new integer. Can't just get the base integer and
627 * increment it because it may be an Arg or Field.
628 */
629 return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
630 if (!return_desc) {
631 status = AE_NO_MEMORY;
632 goto cleanup;
633 }
634
635 /*
636 * Since we are expecting a Reference operand, it can be either a
637 * NS Node or an internal object.
638 */
639 temp_desc = operand[0];
640 if (ACPI_GET_DESCRIPTOR_TYPE(temp_desc) ==
641 ACPI_DESC_TYPE_OPERAND) {
642
643 /* Internal reference object - prevent deletion */
644
645 acpi_ut_add_reference(temp_desc);
646 }
647
648 /*
649 * Convert the Reference operand to an Integer (This removes a
650 * reference on the Operand[0] object)
651 *
652 * NOTE: We use LNOT_OP here in order to force resolution of the
653 * reference operand to an actual integer.
654 */
655 status =
656 acpi_ex_resolve_operands(AML_LNOT_OP, &temp_desc,
657 walk_state);
658 if (ACPI_FAILURE(status)) {
659 ACPI_EXCEPTION((AE_INFO, status,
660 "While resolving operands for [%s]",
661 acpi_ps_get_opcode_name(walk_state->
662 opcode)));
663
664 goto cleanup;
665 }
666
667 /*
668 * temp_desc is now guaranteed to be an Integer object --
669 * Perform the actual increment or decrement
670 */
671 if (walk_state->opcode == AML_INCREMENT_OP) {
672 return_desc->integer.value =
673 temp_desc->integer.value + 1;
674 } else {
675 return_desc->integer.value =
676 temp_desc->integer.value - 1;
677 }
678
679 /* Finished with this Integer object */
680
681 acpi_ut_remove_reference(temp_desc);
682
683 /*
684 * Store the result back (indirectly) through the original
685 * Reference object
686 */
687 status = acpi_ex_store(return_desc, operand[0], walk_state);
688 break;
689
690 case AML_OBJECT_TYPE_OP: /* object_type (source_object) */
691 /*
692 * Note: The operand is not resolved at this point because we want to
693 * get the associated object, not its value. For example, we don't
694 * want to resolve a field_unit to its value, we want the actual
695 * field_unit object.
696 */
697
698 /* Get the type of the base object */
699
700 status =
701 acpi_ex_resolve_multiple(walk_state, operand[0], &type,
702 NULL);
703 if (ACPI_FAILURE(status)) {
704 goto cleanup;
705 }
706
707 /* Allocate a descriptor to hold the type. */
708
709 return_desc = acpi_ut_create_integer_object((u64) type);
710 if (!return_desc) {
711 status = AE_NO_MEMORY;
712 goto cleanup;
713 }
714 break;
715
716 case AML_SIZE_OF_OP: /* size_of (source_object) */
717 /*
718 * Note: The operand is not resolved at this point because we want to
719 * get the associated object, not its value.
720 */
721
722 /* Get the base object */
723
724 status =
725 acpi_ex_resolve_multiple(walk_state, operand[0], &type,
726 &temp_desc);
727 if (ACPI_FAILURE(status)) {
728 goto cleanup;
729 }
730
731 /*
732 * The type of the base object must be integer, buffer, string, or
733 * package. All others are not supported.
734 *
735 * NOTE: Integer is not specifically supported by the ACPI spec,
736 * but is supported implicitly via implicit operand conversion.
737 * rather than bother with conversion, we just use the byte width
738 * global (4 or 8 bytes).
739 */
740 switch (type) {
741 case ACPI_TYPE_INTEGER:
742
743 value = acpi_gbl_integer_byte_width;
744 break;
745
746 case ACPI_TYPE_STRING:
747
748 value = temp_desc->string.length;
749 break;
750
751 case ACPI_TYPE_BUFFER:
752
753 /* Buffer arguments may not be evaluated at this point */
754
755 status = acpi_ds_get_buffer_arguments(temp_desc);
756 value = temp_desc->buffer.length;
757 break;
758
759 case ACPI_TYPE_PACKAGE:
760
761 /* Package arguments may not be evaluated at this point */
762
763 status = acpi_ds_get_package_arguments(temp_desc);
764 value = temp_desc->package.count;
765 break;
766
767 default:
768
769 ACPI_ERROR((AE_INFO,
770 "Operand must be Buffer/Integer/String/Package"
771 " - found type %s",
772 acpi_ut_get_type_name(type)));
773
774 status = AE_AML_OPERAND_TYPE;
775 goto cleanup;
776 }
777
778 if (ACPI_FAILURE(status)) {
779 goto cleanup;
780 }
781
782 /*
783 * Now that we have the size of the object, create a result
784 * object to hold the value
785 */
786 return_desc = acpi_ut_create_integer_object(value);
787 if (!return_desc) {
788 status = AE_NO_MEMORY;
789 goto cleanup;
790 }
791 break;
792
793 case AML_REF_OF_OP: /* ref_of (source_object) */
794
795 status =
796 acpi_ex_get_object_reference(operand[0], &return_desc,
797 walk_state);
798 if (ACPI_FAILURE(status)) {
799 goto cleanup;
800 }
801 break;
802
803 case AML_DEREF_OF_OP: /* deref_of (obj_reference | String) */
804
805 /* Check for a method local or argument, or standalone String */
806
807 if (ACPI_GET_DESCRIPTOR_TYPE(operand[0]) ==
808 ACPI_DESC_TYPE_NAMED) {
809 temp_desc =
810 acpi_ns_get_attached_object((struct
811 acpi_namespace_node *)
812 operand[0]);
813 if (temp_desc
814 && ((temp_desc->common.type == ACPI_TYPE_STRING)
815 || (temp_desc->common.type ==
816 ACPI_TYPE_LOCAL_REFERENCE))) {
817 operand[0] = temp_desc;
818 acpi_ut_add_reference(temp_desc);
819 } else {
820 status = AE_AML_OPERAND_TYPE;
821 goto cleanup;
822 }
823 } else {
824 switch ((operand[0])->common.type) {
825 case ACPI_TYPE_LOCAL_REFERENCE:
826 /*
827 * This is a deref_of (local_x | arg_x)
828 *
829 * Must resolve/dereference the local/arg reference first
830 */
831 switch (operand[0]->reference.class) {
832 case ACPI_REFCLASS_LOCAL:
833 case ACPI_REFCLASS_ARG:
834
835 /* Set Operand[0] to the value of the local/arg */
836
837 status =
838 acpi_ds_method_data_get_value
839 (operand[0]->reference.class,
840 operand[0]->reference.value,
841 walk_state, &temp_desc);
842 if (ACPI_FAILURE(status)) {
843 goto cleanup;
844 }
845
846 /*
847 * Delete our reference to the input object and
848 * point to the object just retrieved
849 */
850 acpi_ut_remove_reference(operand[0]);
851 operand[0] = temp_desc;
852 break;
853
854 case ACPI_REFCLASS_REFOF:
855
856 /* Get the object to which the reference refers */
857
858 temp_desc =
859 operand[0]->reference.object;
860 acpi_ut_remove_reference(operand[0]);
861 operand[0] = temp_desc;
862 break;
863
864 default:
865
866 /* Must be an Index op - handled below */
867 break;
868 }
869 break;
870
871 case ACPI_TYPE_STRING:
872
873 break;
874
875 default:
876
877 status = AE_AML_OPERAND_TYPE;
878 goto cleanup;
879 }
880 }
881
882 if (ACPI_GET_DESCRIPTOR_TYPE(operand[0]) !=
883 ACPI_DESC_TYPE_NAMED) {
884 if ((operand[0])->common.type == ACPI_TYPE_STRING) {
885 /*
886 * This is a deref_of (String). The string is a reference
887 * to a named ACPI object.
888 *
889 * 1) Find the owning Node
890 * 2) Dereference the node to an actual object. Could be a
891 * Field, so we need to resolve the node to a value.
892 */
893 status =
894 acpi_ns_get_node_unlocked(walk_state->
895 scope_info->scope.
896 node,
897 operand[0]->
898 string.pointer,
899 ACPI_NS_SEARCH_PARENT,
900 ACPI_CAST_INDIRECT_PTR
901 (struct
902 acpi_namespace_node,
903 &return_desc));
904 if (ACPI_FAILURE(status)) {
905 goto cleanup;
906 }
907
908 status =
909 acpi_ex_resolve_node_to_value
910 (ACPI_CAST_INDIRECT_PTR
911 (struct acpi_namespace_node, &return_desc),
912 walk_state);
913 goto cleanup;
914 }
915 }
916
917 /* Operand[0] may have changed from the code above */
918
919 if (ACPI_GET_DESCRIPTOR_TYPE(operand[0]) ==
920 ACPI_DESC_TYPE_NAMED) {
921 /*
922 * This is a deref_of (object_reference)
923 * Get the actual object from the Node (This is the dereference).
924 * This case may only happen when a local_x or arg_x is
925 * dereferenced above.
926 */
927 return_desc = acpi_ns_get_attached_object((struct
928 acpi_namespace_node
929 *)
930 operand[0]);
931 acpi_ut_add_reference(return_desc);
932 } else {
933 /*
934 * This must be a reference object produced by either the
935 * Index() or ref_of() operator
936 */
937 switch (operand[0]->reference.class) {
938 case ACPI_REFCLASS_INDEX:
939 /*
940 * The target type for the Index operator must be
941 * either a Buffer or a Package
942 */
943 switch (operand[0]->reference.target_type) {
944 case ACPI_TYPE_BUFFER_FIELD:
945
946 temp_desc =
947 operand[0]->reference.object;
948
949 /*
950 * Create a new object that contains one element of the
951 * buffer -- the element pointed to by the index.
952 *
953 * NOTE: index into a buffer is NOT a pointer to a
954 * sub-buffer of the main buffer, it is only a pointer to a
955 * single element (byte) of the buffer!
956 *
957 * Since we are returning the value of the buffer at the
958 * indexed location, we don't need to add an additional
959 * reference to the buffer itself.
960 */
961 return_desc =
962 acpi_ut_create_integer_object((u64)
963 temp_desc->buffer.pointer[operand[0]->reference.value]);
964 if (!return_desc) {
965 status = AE_NO_MEMORY;
966 goto cleanup;
967 }
968 break;
969
970 case ACPI_TYPE_PACKAGE:
971 /*
972 * Return the referenced element of the package. We must
973 * add another reference to the referenced object, however.
974 */
975 return_desc =
976 *(operand[0]->reference.where);
977 if (!return_desc) {
978 /*
979 * Element is NULL, do not allow the dereference.
980 * This provides compatibility with other ACPI
981 * implementations.
982 */
983 return_ACPI_STATUS
984 (AE_AML_UNINITIALIZED_ELEMENT);
985 }
986
987 acpi_ut_add_reference(return_desc);
988 break;
989
990 default:
991
992 ACPI_ERROR((AE_INFO,
993 "Unknown Index TargetType 0x%X in reference object %p",
994 operand[0]->reference.
995 target_type, operand[0]));
996
997 status = AE_AML_OPERAND_TYPE;
998 goto cleanup;
999 }
1000 break;
1001
1002 case ACPI_REFCLASS_REFOF:
1003
1004 return_desc = operand[0]->reference.object;
1005
1006 if (ACPI_GET_DESCRIPTOR_TYPE(return_desc) ==
1007 ACPI_DESC_TYPE_NAMED) {
1008 return_desc =
1009 acpi_ns_get_attached_object((struct
1010 acpi_namespace_node
1011 *)
1012 return_desc);
1013 if (!return_desc) {
1014 break;
1015 }
1016
1017 /*
1018 * June 2013:
1019 * buffer_fields/field_units require additional resolution
1020 */
1021 switch (return_desc->common.type) {
1022 case ACPI_TYPE_BUFFER_FIELD:
1023 case ACPI_TYPE_LOCAL_REGION_FIELD:
1024 case ACPI_TYPE_LOCAL_BANK_FIELD:
1025 case ACPI_TYPE_LOCAL_INDEX_FIELD:
1026
1027 status =
1028 acpi_ex_read_data_from_field
1029 (walk_state, return_desc,
1030 &temp_desc);
1031 if (ACPI_FAILURE(status)) {
1032 goto cleanup;
1033 }
1034
1035 return_desc = temp_desc;
1036 break;
1037
1038 default:
1039
1040 /* Add another reference to the object */
1041
1042 acpi_ut_add_reference
1043 (return_desc);
1044 break;
1045 }
1046 }
1047 break;
1048
1049 default:
1050
1051 ACPI_ERROR((AE_INFO,
1052 "Unknown class in reference(%p) - 0x%2.2X",
1053 operand[0],
1054 operand[0]->reference.class));
1055
1056 status = AE_TYPE;
1057 goto cleanup;
1058 }
1059 }
1060 break;
1061
1062 default:
1063
1064 ACPI_ERROR((AE_INFO, "Unknown AML opcode 0x%X",
1065 walk_state->opcode));
1066
1067 status = AE_AML_BAD_OPCODE;
1068 goto cleanup;
1069 }
1070
1071 cleanup:
1072
1073 /* Delete return object on error */
1074
1075 if (ACPI_FAILURE(status)) {
1076 acpi_ut_remove_reference(return_desc);
1077 }
1078
1079 /* Save return object on success */
1080
1081 else {
1082 walk_state->result_obj = return_desc;
1083 }
1084
1085 return_ACPI_STATUS(status);
1086 }
Linux kernel - Deliverables
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