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[cor_2_6_31.git] / drivers / acpi / acpica / nspredef.c
blob7f8e066b12a3d20b79a986a7e771d65eef3a332c
1 /******************************************************************************
2 *
3 * Module Name: nspredef - Validation of ACPI predefined methods and objects
4 * $Revision: 1.1 $
5 *
6 *****************************************************************************/
7
8 /*
9 * Copyright (C) 2000 - 2008, 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 "acnamesp.h"
48 #include "acpredef.h"
49
50 #define _COMPONENT ACPI_NAMESPACE
51 ACPI_MODULE_NAME("nspredef")
52
53 /*******************************************************************************
54 *
55 * This module validates predefined ACPI objects that appear in the namespace,
56 * at the time they are evaluated (via acpi_evaluate_object). The purpose of this
57 * validation is to detect problems with BIOS-exposed predefined ACPI objects
58 * before the results are returned to the ACPI-related drivers.
59 *
60 * There are several areas that are validated:
61 *
62 * 1) The number of input arguments as defined by the method/object in the
63 * ASL is validated against the ACPI specification.
64 * 2) The type of the return object (if any) is validated against the ACPI
65 * specification.
66 * 3) For returned package objects, the count of package elements is
67 * validated, as well as the type of each package element. Nested
68 * packages are supported.
69 *
70 * For any problems found, a warning message is issued.
71 *
72 ******************************************************************************/
73 /* Local prototypes */
74 static acpi_status
75 acpi_ns_check_package(char *pathname,
76 union acpi_operand_object **return_object_ptr,
77 const union acpi_predefined_info *predefined);
78
79 static acpi_status
80 acpi_ns_check_package_elements(char *pathname,
81 union acpi_operand_object **elements,
82 u8 type1,
83 u32 count1,
84 u8 type2, u32 count2, u32 start_index);
85
86 static acpi_status
87 acpi_ns_check_object_type(char *pathname,
88 union acpi_operand_object **return_object_ptr,
89 u32 expected_btypes, u32 package_index);
90
91 static acpi_status
92 acpi_ns_check_reference(char *pathname,
93 union acpi_operand_object *return_object);
94
95 static acpi_status
96 acpi_ns_repair_object(u32 expected_btypes,
97 u32 package_index,
98 union acpi_operand_object **return_object_ptr);
99
100 /*
101 * Names for the types that can be returned by the predefined objects.
102 * Used for warning messages. Must be in the same order as the ACPI_RTYPEs
103 */
104 static const char *acpi_rtype_names[] = {
105 "/Integer",
106 "/String",
107 "/Buffer",
108 "/Package",
109 "/Reference",
110 };
111
112 #define ACPI_NOT_PACKAGE ACPI_UINT32_MAX
113
114 /*******************************************************************************
115 *
116 * FUNCTION: acpi_ns_check_predefined_names
117 *
118 * PARAMETERS: Node - Namespace node for the method/object
119 * return_object_ptr - Pointer to the object returned from the
120 * evaluation of a method or object
121 *
122 * RETURN: Status
123 *
124 * DESCRIPTION: Check an ACPI name for a match in the predefined name list.
125 *
126 ******************************************************************************/
127
128 acpi_status
129 acpi_ns_check_predefined_names(struct acpi_namespace_node *node,
130 u32 user_param_count,
131 acpi_status return_status,
132 union acpi_operand_object **return_object_ptr)
133 {
134 union acpi_operand_object *return_object = *return_object_ptr;
135 acpi_status status = AE_OK;
136 const union acpi_predefined_info *predefined;
137 char *pathname;
138
139 /* Match the name for this method/object against the predefined list */
140
141 predefined = acpi_ns_check_for_predefined_name(node);
142
143 /* Get the full pathname to the object, for use in error messages */
144
145 pathname = acpi_ns_get_external_pathname(node);
146 if (!pathname) {
147 return AE_OK; /* Could not get pathname, ignore */
148 }
149
150 /*
151 * Check that the parameter count for this method matches the ASL
152 * definition. For predefined names, ensure that both the caller and
153 * the method itself are in accordance with the ACPI specification.
154 */
155 acpi_ns_check_parameter_count(pathname, node, user_param_count,
156 predefined);
157
158 /* If not a predefined name, we cannot validate the return object */
159
160 if (!predefined) {
161 goto exit;
162 }
163
164 /* If the method failed, we cannot validate the return object */
165
166 if ((return_status != AE_OK) && (return_status != AE_CTRL_RETURN_VALUE)) {
167 goto exit;
168 }
169
170 /*
171 * Only validate the return value on the first successful evaluation of
172 * the method. This ensures that any warnings will only be emitted during
173 * the very first evaluation of the method/object.
174 */
175 if (node->flags & ANOBJ_EVALUATED) {
176 goto exit;
177 }
178
179 /* Mark the node as having been successfully evaluated */
180
181 node->flags |= ANOBJ_EVALUATED;
182
183 /*
184 * If there is no return value, check if we require a return value for
185 * this predefined name. Either one return value is expected, or none,
186 * for both methods and other objects.
187 *
188 * Exit now if there is no return object. Warning if one was expected.
189 */
190 if (!return_object) {
191 if ((predefined->info.expected_btypes) &&
192 (!(predefined->info.expected_btypes & ACPI_RTYPE_NONE))) {
193 ACPI_ERROR((AE_INFO,
194 "%s: Missing expected return value",
195 pathname));
196
197 status = AE_AML_NO_RETURN_VALUE;
198 }
199 goto exit;
200 }
201
202 /*
203 * We have a return value, but if one wasn't expected, just exit, this is
204 * not a problem
205 *
206 * For example, if the "Implicit Return" feature is enabled, methods will
207 * always return a value
208 */
209 if (!predefined->info.expected_btypes) {
210 goto exit;
211 }
212
213 /*
214 * Check that the type of the return object is what is expected for
215 * this predefined name
216 */
217 status = acpi_ns_check_object_type(pathname, return_object_ptr,
218 predefined->info.expected_btypes,
219 ACPI_NOT_PACKAGE);
220 if (ACPI_FAILURE(status)) {
221 goto exit;
222 }
223
224 /* For returned Package objects, check the type of all sub-objects */
225
226 if (return_object->common.type == ACPI_TYPE_PACKAGE) {
227 status =
228 acpi_ns_check_package(pathname, return_object_ptr,
229 predefined);
230 }
231
232 exit:
233 ACPI_FREE(pathname);
234 return (status);
235 }
236
237 /*******************************************************************************
238 *
239 * FUNCTION: acpi_ns_check_parameter_count
240 *
241 * PARAMETERS: Pathname - Full pathname to the node (for error msgs)
242 * Node - Namespace node for the method/object
243 * user_param_count - Number of args passed in by the caller
244 * Predefined - Pointer to entry in predefined name table
245 *
246 * RETURN: None
247 *
248 * DESCRIPTION: Check that the declared (in ASL/AML) parameter count for a
249 * predefined name is what is expected (i.e., what is defined in
250 * the ACPI specification for this predefined name.)
251 *
252 ******************************************************************************/
253
254 void
255 acpi_ns_check_parameter_count(char *pathname,
256 struct acpi_namespace_node *node,
257 u32 user_param_count,
258 const union acpi_predefined_info *predefined)
259 {
260 u32 param_count;
261 u32 required_params_current;
262 u32 required_params_old;
263
264 /* Methods have 0-7 parameters. All other types have zero. */
265
266 param_count = 0;
267 if (node->type == ACPI_TYPE_METHOD) {
268 param_count = node->object->method.param_count;
269 }
270
271 /* Argument count check for non-predefined methods/objects */
272
273 if (!predefined) {
274 /*
275 * Warning if too few or too many arguments have been passed by the
276 * caller. An incorrect number of arguments may not cause the method
277 * to fail. However, the method will fail if there are too few
278 * arguments and the method attempts to use one of the missing ones.
279 */
280 if (user_param_count < param_count) {
281 ACPI_WARNING((AE_INFO,
282 "%s: Insufficient arguments - needs %d, found %d",
283 pathname, param_count, user_param_count));
284 } else if (user_param_count > param_count) {
285 ACPI_WARNING((AE_INFO,
286 "%s: Excess arguments - needs %d, found %d",
287 pathname, param_count, user_param_count));
288 }
289 return;
290 }
291
292 /* Allow two different legal argument counts (_SCP, etc.) */
293
294 required_params_current = predefined->info.param_count & 0x0F;
295 required_params_old = predefined->info.param_count >> 4;
296
297 if (user_param_count != ACPI_UINT32_MAX) {
298
299 /* Validate the user-supplied parameter count */
300
301 if ((user_param_count != required_params_current) &&
302 (user_param_count != required_params_old)) {
303 ACPI_WARNING((AE_INFO,
304 "%s: Parameter count mismatch - "
305 "caller passed %d, ACPI requires %d",
306 pathname, user_param_count,
307 required_params_current));
308 }
309 }
310
311 /*
312 * Only validate the argument count on the first successful evaluation of
313 * the method. This ensures that any warnings will only be emitted during
314 * the very first evaluation of the method/object.
315 */
316 if (node->flags & ANOBJ_EVALUATED) {
317 return;
318 }
319
320 /*
321 * Check that the ASL-defined parameter count is what is expected for
322 * this predefined name.
323 */
324 if ((param_count != required_params_current) &&
325 (param_count != required_params_old)) {
326 ACPI_WARNING((AE_INFO,
327 "%s: Parameter count mismatch - ASL declared %d, ACPI requires %d",
328 pathname, param_count, required_params_current));
329 }
330 }
331
332 /*******************************************************************************
333 *
334 * FUNCTION: acpi_ns_check_for_predefined_name
335 *
336 * PARAMETERS: Node - Namespace node for the method/object
337 *
338 * RETURN: Pointer to entry in predefined table. NULL indicates not found.
339 *
340 * DESCRIPTION: Check an object name against the predefined object list.
341 *
342 ******************************************************************************/
343
344 const union acpi_predefined_info *acpi_ns_check_for_predefined_name(struct
345 acpi_namespace_node
346 *node)
347 {
348 const union acpi_predefined_info *this_name;
349
350 /* Quick check for a predefined name, first character must be underscore */
351
352 if (node->name.ascii[0] != '_') {
353 return (NULL);
354 }
355
356 /* Search info table for a predefined method/object name */
357
358 this_name = predefined_names;
359 while (this_name->info.name[0]) {
360 if (ACPI_COMPARE_NAME(node->name.ascii, this_name->info.name)) {
361
362 /* Return pointer to this table entry */
363
364 return (this_name);
365 }
366
367 /*
368 * Skip next entry in the table if this name returns a Package
369 * (next entry contains the package info)
370 */
371 if (this_name->info.expected_btypes & ACPI_RTYPE_PACKAGE) {
372 this_name++;
373 }
374
375 this_name++;
376 }
377
378 return (NULL);
379 }
380
381 /*******************************************************************************
382 *
383 * FUNCTION: acpi_ns_check_package
384 *
385 * PARAMETERS: Pathname - Full pathname to the node (for error msgs)
386 * return_object_ptr - Pointer to the object returned from the
387 * evaluation of a method or object
388 * Predefined - Pointer to entry in predefined name table
389 *
390 * RETURN: Status
391 *
392 * DESCRIPTION: Check a returned package object for the correct count and
393 * correct type of all sub-objects.
394 *
395 ******************************************************************************/
396
397 static acpi_status
398 acpi_ns_check_package(char *pathname,
399 union acpi_operand_object **return_object_ptr,
400 const union acpi_predefined_info *predefined)
401 {
402 union acpi_operand_object *return_object = *return_object_ptr;
403 const union acpi_predefined_info *package;
404 union acpi_operand_object *sub_package;
405 union acpi_operand_object **elements;
406 union acpi_operand_object **sub_elements;
407 acpi_status status;
408 u32 expected_count;
409 u32 count;
410 u32 i;
411 u32 j;
412
413 ACPI_FUNCTION_NAME(ns_check_package);
414
415 /* The package info for this name is in the next table entry */
416
417 package = predefined + 1;
418
419 ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
420 "%s Validating return Package of Type %X, Count %X\n",
421 pathname, package->ret_info.type,
422 return_object->package.count));
423
424 /* Extract package count and elements array */
425
426 elements = return_object->package.elements;
427 count = return_object->package.count;
428
429 /* The package must have at least one element, else invalid */
430
431 if (!count) {
432 ACPI_WARNING((AE_INFO,
433 "%s: Return Package has no elements (empty)",
434 pathname));
435
436 return (AE_AML_OPERAND_VALUE);
437 }
438
439 /*
440 * Decode the type of the expected package contents
441 *
442 * PTYPE1 packages contain no subpackages
443 * PTYPE2 packages contain sub-packages
444 */
445 switch (package->ret_info.type) {
446 case ACPI_PTYPE1_FIXED:
447
448 /*
449 * The package count is fixed and there are no sub-packages
450 *
451 * If package is too small, exit.
452 * If package is larger than expected, issue warning but continue
453 */
454 expected_count =
455 package->ret_info.count1 + package->ret_info.count2;
456 if (count < expected_count) {
457 goto package_too_small;
458 } else if (count > expected_count) {
459 ACPI_WARNING((AE_INFO,
460 "%s: Return Package is larger than needed - "
461 "found %u, expected %u", pathname, count,
462 expected_count));
463 }
464
465 /* Validate all elements of the returned package */
466
467 status = acpi_ns_check_package_elements(pathname, elements,
468 package->ret_info.
469 object_type1,
470 package->ret_info.
471 count1,
472 package->ret_info.
473 object_type2,
474 package->ret_info.
475 count2, 0);
476 if (ACPI_FAILURE(status)) {
477 return (status);
478 }
479 break;
480
481 case ACPI_PTYPE1_VAR:
482
483 /*
484 * The package count is variable, there are no sub-packages, and all
485 * elements must be of the same type
486 */
487 for (i = 0; i < count; i++) {
488 status = acpi_ns_check_object_type(pathname, elements,
489 package->ret_info.
490 object_type1, i);
491 if (ACPI_FAILURE(status)) {
492 return (status);
493 }
494 elements++;
495 }
496 break;
497
498 case ACPI_PTYPE1_OPTION:
499
500 /*
501 * The package count is variable, there are no sub-packages. There are
502 * a fixed number of required elements, and a variable number of
503 * optional elements.
504 *
505 * Check if package is at least as large as the minimum required
506 */
507 expected_count = package->ret_info3.count;
508 if (count < expected_count) {
509 goto package_too_small;
510 }
511
512 /* Variable number of sub-objects */
513
514 for (i = 0; i < count; i++) {
515 if (i < package->ret_info3.count) {
516
517 /* These are the required package elements (0, 1, or 2) */
518
519 status =
520 acpi_ns_check_object_type(pathname,
521 elements,
522 package->
523 ret_info3.
524 object_type[i],
525 i);
526 if (ACPI_FAILURE(status)) {
527 return (status);
528 }
529 } else {
530 /* These are the optional package elements */
531
532 status =
533 acpi_ns_check_object_type(pathname,
534 elements,
535 package->
536 ret_info3.
537 tail_object_type,
538 i);
539 if (ACPI_FAILURE(status)) {
540 return (status);
541 }
542 }
543 elements++;
544 }
545 break;
546
547 case ACPI_PTYPE2_PKG_COUNT:
548
549 /* First element is the (Integer) count of sub-packages to follow */
550
551 status = acpi_ns_check_object_type(pathname, elements,
552 ACPI_RTYPE_INTEGER, 0);
553 if (ACPI_FAILURE(status)) {
554 return (status);
555 }
556
557 /*
558 * Count cannot be larger than the parent package length, but allow it
559 * to be smaller. The >= accounts for the Integer above.
560 */
561 expected_count = (u32) (*elements)->integer.value;
562 if (expected_count >= count) {
563 goto package_too_small;
564 }
565
566 count = expected_count;
567 elements++;
568
569 /* Now we can walk the sub-packages */
570
571 /*lint -fallthrough */
572
573 case ACPI_PTYPE2:
574 case ACPI_PTYPE2_FIXED:
575 case ACPI_PTYPE2_MIN:
576 case ACPI_PTYPE2_COUNT:
577
578 /*
579 * These types all return a single package that consists of a variable
580 * number of sub-packages
581 */
582 for (i = 0; i < count; i++) {
583 sub_package = *elements;
584 sub_elements = sub_package->package.elements;
585
586 /* Each sub-object must be of type Package */
587
588 status =
589 acpi_ns_check_object_type(pathname, &sub_package,
590 ACPI_RTYPE_PACKAGE, i);
591 if (ACPI_FAILURE(status)) {
592 return (status);
593 }
594
595 /* Examine the different types of sub-packages */
596
597 switch (package->ret_info.type) {
598 case ACPI_PTYPE2:
599 case ACPI_PTYPE2_PKG_COUNT:
600
601 /* Each subpackage has a fixed number of elements */
602
603 expected_count =
604 package->ret_info.count1 +
605 package->ret_info.count2;
606 if (sub_package->package.count !=
607 expected_count) {
608 count = sub_package->package.count;
609 goto package_too_small;
610 }
611
612 status =
613 acpi_ns_check_package_elements(pathname,
614 sub_elements,
615 package->
616 ret_info.
617 object_type1,
618 package->
619 ret_info.
620 count1,
621 package->
622 ret_info.
623 object_type2,
624 package->
625 ret_info.
626 count2, 0);
627 if (ACPI_FAILURE(status)) {
628 return (status);
629 }
630 break;
631
632 case ACPI_PTYPE2_FIXED:
633
634 /* Each sub-package has a fixed length */
635
636 expected_count = package->ret_info2.count;
637 if (sub_package->package.count < expected_count) {
638 count = sub_package->package.count;
639 goto package_too_small;
640 }
641
642 /* Check the type of each sub-package element */
643
644 for (j = 0; j < expected_count; j++) {
645 status =
646 acpi_ns_check_object_type(pathname,
647 &sub_elements[j],
648 package->ret_info2.object_type[j], j);
649 if (ACPI_FAILURE(status)) {
650 return (status);
651 }
652 }
653 break;
654
655 case ACPI_PTYPE2_MIN:
656
657 /* Each sub-package has a variable but minimum length */
658
659 expected_count = package->ret_info.count1;
660 if (sub_package->package.count < expected_count) {
661 count = sub_package->package.count;
662 goto package_too_small;
663 }
664
665 /* Check the type of each sub-package element */
666
667 status =
668 acpi_ns_check_package_elements(pathname,
669 sub_elements,
670 package->
671 ret_info.
672 object_type1,
673 sub_package->
674 package.
675 count, 0, 0,
676 0);
677 if (ACPI_FAILURE(status)) {
678 return (status);
679 }
680 break;
681
682 case ACPI_PTYPE2_COUNT:
683
684 /* First element is the (Integer) count of elements to follow */
685
686 status =
687 acpi_ns_check_object_type(pathname,
688 sub_elements,
689 ACPI_RTYPE_INTEGER,
690 0);
691 if (ACPI_FAILURE(status)) {
692 return (status);
693 }
694
695 /* Make sure package is large enough for the Count */
696
697 expected_count =
698 (u32) (*sub_elements)->integer.value;
699 if (sub_package->package.count < expected_count) {
700 count = sub_package->package.count;
701 goto package_too_small;
702 }
703
704 /* Check the type of each sub-package element */
705
706 status =
707 acpi_ns_check_package_elements(pathname,
708 (sub_elements
709 + 1),
710 package->
711 ret_info.
712 object_type1,
713 (expected_count
714 - 1), 0, 0,
715 1);
716 if (ACPI_FAILURE(status)) {
717 return (status);
718 }
719 break;
720
721 default:
722 break;
723 }
724
725 elements++;
726 }
727 break;
728
729 default:
730
731 /* Should not get here if predefined info table is correct */
732
733 ACPI_WARNING((AE_INFO,
734 "%s: Invalid internal return type in table entry: %X",
735 pathname, package->ret_info.type));
736
737 return (AE_AML_INTERNAL);
738 }
739
740 return (AE_OK);
741
742 package_too_small:
743
744 /* Error exit for the case with an incorrect package count */
745
746 ACPI_WARNING((AE_INFO, "%s: Return Package is too small - "
747 "found %u, expected %u", pathname, count,
748 expected_count));
749
750 return (AE_AML_OPERAND_VALUE);
751 }
752
753 /*******************************************************************************
754 *
755 * FUNCTION: acpi_ns_check_package_elements
756 *
757 * PARAMETERS: Pathname - Full pathname to the node (for error msgs)
758 * Elements - Pointer to the package elements array
759 * Type1 - Object type for first group
760 * Count1 - Count for first group
761 * Type2 - Object type for second group
762 * Count2 - Count for second group
763 * start_index - Start of the first group of elements
764 *
765 * RETURN: Status
766 *
767 * DESCRIPTION: Check that all elements of a package are of the correct object
768 * type. Supports up to two groups of different object types.
769 *
770 ******************************************************************************/
771
772 static acpi_status
773 acpi_ns_check_package_elements(char *pathname,
774 union acpi_operand_object **elements,
775 u8 type1,
776 u32 count1,
777 u8 type2, u32 count2, u32 start_index)
778 {
779 union acpi_operand_object **this_element = elements;
780 acpi_status status;
781 u32 i;
782
783 /*
784 * Up to two groups of package elements are supported by the data
785 * structure. All elements in each group must be of the same type.
786 * The second group can have a count of zero.
787 */
788 for (i = 0; i < count1; i++) {
789 status = acpi_ns_check_object_type(pathname, this_element,
790 type1, i + start_index);
791 if (ACPI_FAILURE(status)) {
792 return (status);
793 }
794 this_element++;
795 }
796
797 for (i = 0; i < count2; i++) {
798 status = acpi_ns_check_object_type(pathname, this_element,
799 type2,
800 (i + count1 + start_index));
801 if (ACPI_FAILURE(status)) {
802 return (status);
803 }
804 this_element++;
805 }
806
807 return (AE_OK);
808 }
809
810 /*******************************************************************************
811 *
812 * FUNCTION: acpi_ns_check_object_type
813 *
814 * PARAMETERS: Pathname - Full pathname to the node (for error msgs)
815 * return_object_ptr - Pointer to the object returned from the
816 * evaluation of a method or object
817 * expected_btypes - Bitmap of expected return type(s)
818 * package_index - Index of object within parent package (if
819 * applicable - ACPI_NOT_PACKAGE otherwise)
820 *
821 * RETURN: Status
822 *
823 * DESCRIPTION: Check the type of the return object against the expected object
824 * type(s). Use of Btype allows multiple expected object types.
825 *
826 ******************************************************************************/
827
828 static acpi_status
829 acpi_ns_check_object_type(char *pathname,
830 union acpi_operand_object **return_object_ptr,
831 u32 expected_btypes, u32 package_index)
832 {
833 union acpi_operand_object *return_object = *return_object_ptr;
834 acpi_status status = AE_OK;
835 u32 return_btype;
836 char type_buffer[48]; /* Room for 5 types */
837 u32 this_rtype;
838 u32 i;
839 u32 j;
840
841 /*
842 * If we get a NULL return_object here, it is a NULL package element,
843 * and this is always an error.
844 */
845 if (!return_object) {
846 goto type_error_exit;
847 }
848
849 /* A Namespace node should not get here, but make sure */
850
851 if (ACPI_GET_DESCRIPTOR_TYPE(return_object) == ACPI_DESC_TYPE_NAMED) {
852 ACPI_WARNING((AE_INFO,
853 "%s: Invalid return type - Found a Namespace node [%4.4s] type %s",
854 pathname, return_object->node.name.ascii,
855 acpi_ut_get_type_name(return_object->node.type)));
856 return (AE_AML_OPERAND_TYPE);
857 }
858
859 /*
860 * Convert the object type (ACPI_TYPE_xxx) to a bitmapped object type.
861 * The bitmapped type allows multiple possible return types.
862 *
863 * Note, the cases below must handle all of the possible types returned
864 * from all of the predefined names (including elements of returned
865 * packages)
866 */
867 switch (return_object->common.type) {
868 case ACPI_TYPE_INTEGER:
869 return_btype = ACPI_RTYPE_INTEGER;
870 break;
871
872 case ACPI_TYPE_BUFFER:
873 return_btype = ACPI_RTYPE_BUFFER;
874 break;
875
876 case ACPI_TYPE_STRING:
877 return_btype = ACPI_RTYPE_STRING;
878 break;
879
880 case ACPI_TYPE_PACKAGE:
881 return_btype = ACPI_RTYPE_PACKAGE;
882 break;
883
884 case ACPI_TYPE_LOCAL_REFERENCE:
885 return_btype = ACPI_RTYPE_REFERENCE;
886 break;
887
888 default:
889 /* Not one of the supported objects, must be incorrect */
890
891 goto type_error_exit;
892 }
893
894 /* Is the object one of the expected types? */
895
896 if (!(return_btype & expected_btypes)) {
897
898 /* Type mismatch -- attempt repair of the returned object */
899
900 status = acpi_ns_repair_object(expected_btypes, package_index,
901 return_object_ptr);
902 if (ACPI_SUCCESS(status)) {
903 return (status);
904 }
905 goto type_error_exit;
906 }
907
908 /* For reference objects, check that the reference type is correct */
909
910 if (return_object->common.type == ACPI_TYPE_LOCAL_REFERENCE) {
911 status = acpi_ns_check_reference(pathname, return_object);
912 }
913
914 return (status);
915
916 type_error_exit:
917
918 /* Create a string with all expected types for this predefined object */
919
920 j = 1;
921 type_buffer[0] = 0;
922 this_rtype = ACPI_RTYPE_INTEGER;
923
924 for (i = 0; i < ACPI_NUM_RTYPES; i++) {
925
926 /* If one of the expected types, concatenate the name of this type */
927
928 if (expected_btypes & this_rtype) {
929 ACPI_STRCAT(type_buffer, &acpi_rtype_names[i][j]);
930 j = 0; /* Use name separator from now on */
931 }
932 this_rtype <<= 1; /* Next Rtype */
933 }
934
935 if (package_index == ACPI_NOT_PACKAGE) {
936 ACPI_WARNING((AE_INFO,
937 "%s: Return type mismatch - found %s, expected %s",
938 pathname,
939 acpi_ut_get_object_type_name(return_object),
940 type_buffer));
941 } else {
942 ACPI_WARNING((AE_INFO,
943 "%s: Return Package type mismatch at index %u - "
944 "found %s, expected %s", pathname, package_index,
945 acpi_ut_get_object_type_name(return_object),
946 type_buffer));
947 }
948
949 return (AE_AML_OPERAND_TYPE);
950 }
951
952 /*******************************************************************************
953 *
954 * FUNCTION: acpi_ns_check_reference
955 *
956 * PARAMETERS: Pathname - Full pathname to the node (for error msgs)
957 * return_object - Object returned from the evaluation of a
958 * method or object
959 *
960 * RETURN: Status
961 *
962 * DESCRIPTION: Check a returned reference object for the correct reference
963 * type. The only reference type that can be returned from a
964 * predefined method is a named reference. All others are invalid.
965 *
966 ******************************************************************************/
967
968 static acpi_status
969 acpi_ns_check_reference(char *pathname,
970 union acpi_operand_object *return_object)
971 {
972
973 /*
974 * Check the reference object for the correct reference type (opcode).
975 * The only type of reference that can be converted to an union acpi_object is
976 * a reference to a named object (reference class: NAME)
977 */
978 if (return_object->reference.class == ACPI_REFCLASS_NAME) {
979 return (AE_OK);
980 }
981
982 ACPI_WARNING((AE_INFO,
983 "%s: Return type mismatch - "
984 "unexpected reference object type [%s] %2.2X",
985 pathname, acpi_ut_get_reference_name(return_object),
986 return_object->reference.class));
987
988 return (AE_AML_OPERAND_TYPE);
989 }
990
991 /*******************************************************************************
992 *
993 * FUNCTION: acpi_ns_repair_object
994 *
995 * PARAMETERS: Pathname - Full pathname to the node (for error msgs)
996 * package_index - Used to determine if target is in a package
997 * return_object_ptr - Pointer to the object returned from the
998 * evaluation of a method or object
999 *
1000 * RETURN: Status. AE_OK if repair was successful.
1001 *
1002 * DESCRIPTION: Attempt to repair/convert a return object of a type that was
1003 * not expected.
1004 *
1005 ******************************************************************************/
1006
1007 static acpi_status
1008 acpi_ns_repair_object(u32 expected_btypes,
1009 u32 package_index,
1010 union acpi_operand_object **return_object_ptr)
1011 {
1012 union acpi_operand_object *return_object = *return_object_ptr;
1013 union acpi_operand_object *new_object;
1014 acpi_size length;
1015
1016 switch (return_object->common.type) {
1017 case ACPI_TYPE_BUFFER:
1018
1019 if (!(expected_btypes & ACPI_RTYPE_STRING)) {
1020 return (AE_AML_OPERAND_TYPE);
1021 }
1022
1023 /*
1024 * Have a Buffer, expected a String, convert. Use a to_string
1025 * conversion, no transform performed on the buffer data. The best
1026 * example of this is the _BIF method, where the string data from
1027 * the battery is often (incorrectly) returned as buffer object(s).
1028 */
1029 length = 0;
1030 while ((length < return_object->buffer.length) &&
1031 (return_object->buffer.pointer[length])) {
1032 length++;
1033 }
1034
1035 /* Allocate a new string object */
1036
1037 new_object = acpi_ut_create_string_object(length);
1038 if (!new_object) {
1039 return (AE_NO_MEMORY);
1040 }
1041
1042 /*
1043 * Copy the raw buffer data with no transform. String is already NULL
1044 * terminated at Length+1.
1045 */
1046 ACPI_MEMCPY(new_object->string.pointer,
1047 return_object->buffer.pointer, length);
1048
1049 /* Install the new return object */
1050
1051 acpi_ut_remove_reference(return_object);
1052 *return_object_ptr = new_object;
1053
1054 /*
1055 * If the object is a package element, we need to:
1056 * 1. Decrement the reference count of the orignal object, it was
1057 * incremented when building the package
1058 * 2. Increment the reference count of the new object, it will be
1059 * decremented when releasing the package
1060 */
1061 if (package_index != ACPI_NOT_PACKAGE) {
1062 acpi_ut_remove_reference(return_object);
1063 acpi_ut_add_reference(new_object);
1064 }
1065 return (AE_OK);
1066
1067 default:
1068 break;
1069 }
1070
1071 return (AE_AML_OPERAND_TYPE);
1072 }
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