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1/******************************************************************************
2 *
3 * Module Name: nsrepair - Repair for objects returned by predefined methods
4 *
5 *****************************************************************************/
6
7/*
8 * Copyright (C) 2000 - 2011, 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 "acnamesp.h"
47#include "acinterp.h"
48#include "acpredef.h"
49
50#define _COMPONENT ACPI_NAMESPACE
51ACPI_MODULE_NAME("nsrepair")
52
53/*******************************************************************************
54 *
55 * This module attempts to repair or convert objects returned by the
56 * predefined methods to an object type that is expected, as per the ACPI
57 * specification. The need for this code is dictated by the many machines that
58 * return incorrect types for the standard predefined methods. Performing these
59 * conversions here, in one place, eliminates the need for individual ACPI
60 * device drivers to do the same. Note: Most of these conversions are different
61 * than the internal object conversion routines used for implicit object
62 * conversion.
63 *
64 * The following conversions can be performed as necessary:
65 *
66 * Integer -> String
67 * Integer -> Buffer
68 * String -> Integer
69 * String -> Buffer
70 * Buffer -> Integer
71 * Buffer -> String
72 * Buffer -> Package of Integers
73 * Package -> Package of one Package
74 *
75 * Additional possible repairs:
76 *
77 * Required package elements that are NULL replaced by Integer/String/Buffer
78 * Incorrect standalone package wrapped with required outer package
79 *
80 ******************************************************************************/
81/* Local prototypes */
82static acpi_status
83acpi_ns_convert_to_integer(union acpi_operand_object *original_object,
84 union acpi_operand_object **return_object);
85
86static acpi_status
87acpi_ns_convert_to_string(union acpi_operand_object *original_object,
88 union acpi_operand_object **return_object);
89
90static acpi_status
91acpi_ns_convert_to_buffer(union acpi_operand_object *original_object,
92 union acpi_operand_object **return_object);
93
94static acpi_status
95acpi_ns_convert_to_package(union acpi_operand_object *original_object,
96 union acpi_operand_object **return_object);
97
98/*******************************************************************************
99 *
100 * FUNCTION: acpi_ns_repair_object
101 *
102 * PARAMETERS: Data - Pointer to validation data structure
103 * expected_btypes - Object types expected
104 * package_index - Index of object within parent package (if
105 * applicable - ACPI_NOT_PACKAGE_ELEMENT
106 * otherwise)
107 * return_object_ptr - Pointer to the object returned from the
108 * evaluation of a method or object
109 *
110 * RETURN: Status. AE_OK if repair was successful.
111 *
112 * DESCRIPTION: Attempt to repair/convert a return object of a type that was
113 * not expected.
114 *
115 ******************************************************************************/
116
117acpi_status
118acpi_ns_repair_object(struct acpi_predefined_data *data,
119 u32 expected_btypes,
120 u32 package_index,
121 union acpi_operand_object **return_object_ptr)
122{
123 union acpi_operand_object *return_object = *return_object_ptr;
124 union acpi_operand_object *new_object;
125 acpi_status status;
126
127 ACPI_FUNCTION_NAME(ns_repair_object);
128
129 /*
130 * At this point, we know that the type of the returned object was not
131 * one of the expected types for this predefined name. Attempt to
132 * repair the object by converting it to one of the expected object
133 * types for this predefined name.
134 */
135 if (expected_btypes & ACPI_RTYPE_INTEGER) {
136 status = acpi_ns_convert_to_integer(return_object, &new_object);
137 if (ACPI_SUCCESS(status)) {
138 goto object_repaired;
139 }
140 }
141 if (expected_btypes & ACPI_RTYPE_STRING) {
142 status = acpi_ns_convert_to_string(return_object, &new_object);
143 if (ACPI_SUCCESS(status)) {
144 goto object_repaired;
145 }
146 }
147 if (expected_btypes & ACPI_RTYPE_BUFFER) {
148 status = acpi_ns_convert_to_buffer(return_object, &new_object);
149 if (ACPI_SUCCESS(status)) {
150 goto object_repaired;
151 }
152 }
153 if (expected_btypes & ACPI_RTYPE_PACKAGE) {
154 status = acpi_ns_convert_to_package(return_object, &new_object);
155 if (ACPI_SUCCESS(status)) {
156 goto object_repaired;
157 }
158 }
159
160 /* We cannot repair this object */
161
162 return (AE_AML_OPERAND_TYPE);
163
164 object_repaired:
165
166 /* Object was successfully repaired */
167
168 /*
169 * If the original object is a package element, we need to:
170 * 1. Set the reference count of the new object to match the
171 * reference count of the old object.
172 * 2. Decrement the reference count of the original object.
173 */
174 if (package_index != ACPI_NOT_PACKAGE_ELEMENT) {
175 new_object->common.reference_count =
176 return_object->common.reference_count;
177
178 if (return_object->common.reference_count > 1) {
179 return_object->common.reference_count--;
180 }
181
182 ACPI_DEBUG_PRINT((ACPI_DB_REPAIR,
183 "%s: Converted %s to expected %s at index %u\n",
184 data->pathname,
185 acpi_ut_get_object_type_name(return_object),
186 acpi_ut_get_object_type_name(new_object),
187 package_index));
188 } else {
189 ACPI_DEBUG_PRINT((ACPI_DB_REPAIR,
190 "%s: Converted %s to expected %s\n",
191 data->pathname,
192 acpi_ut_get_object_type_name(return_object),
193 acpi_ut_get_object_type_name(new_object)));
194 }
195
196 /* Delete old object, install the new return object */
197
198 acpi_ut_remove_reference(return_object);
199 *return_object_ptr = new_object;
200 data->flags |= ACPI_OBJECT_REPAIRED;
201 return (AE_OK);
202}
203
204/*******************************************************************************
205 *
206 * FUNCTION: acpi_ns_convert_to_integer
207 *
208 * PARAMETERS: original_object - Object to be converted
209 * return_object - Where the new converted object is returned
210 *
211 * RETURN: Status. AE_OK if conversion was successful.
212 *
213 * DESCRIPTION: Attempt to convert a String/Buffer object to an Integer.
214 *
215 ******************************************************************************/
216
217static acpi_status
218acpi_ns_convert_to_integer(union acpi_operand_object *original_object,
219 union acpi_operand_object **return_object)
220{
221 union acpi_operand_object *new_object;
222 acpi_status status;
223 u64 value = 0;
224 u32 i;
225
226 switch (original_object->common.type) {
227 case ACPI_TYPE_STRING:
228
229 /* String-to-Integer conversion */
230
231 status = acpi_ut_strtoul64(original_object->string.pointer,
232 ACPI_ANY_BASE, &value);
233 if (ACPI_FAILURE(status)) {
234 return (status);
235 }
236 break;
237
238 case ACPI_TYPE_BUFFER:
239
240 /* Buffer-to-Integer conversion. Max buffer size is 64 bits. */
241
242 if (original_object->buffer.length > 8) {
243 return (AE_AML_OPERAND_TYPE);
244 }
245
246 /* Extract each buffer byte to create the integer */
247
248 for (i = 0; i < original_object->buffer.length; i++) {
249 value |=
250 ((u64) original_object->buffer.
251 pointer[i] << (i * 8));
252 }
253 break;
254
255 default:
256 return (AE_AML_OPERAND_TYPE);
257 }
258
259 new_object = acpi_ut_create_integer_object(value);
260 if (!new_object) {
261 return (AE_NO_MEMORY);
262 }
263
264 *return_object = new_object;
265 return (AE_OK);
266}
267
268/*******************************************************************************
269 *
270 * FUNCTION: acpi_ns_convert_to_string
271 *
272 * PARAMETERS: original_object - Object to be converted
273 * return_object - Where the new converted object is returned
274 *
275 * RETURN: Status. AE_OK if conversion was successful.
276 *
277 * DESCRIPTION: Attempt to convert a Integer/Buffer object to a String.
278 *
279 ******************************************************************************/
280
281static acpi_status
282acpi_ns_convert_to_string(union acpi_operand_object *original_object,
283 union acpi_operand_object **return_object)
284{
285 union acpi_operand_object *new_object;
286 acpi_size length;
287 acpi_status status;
288
289 switch (original_object->common.type) {
290 case ACPI_TYPE_INTEGER:
291 /*
292 * Integer-to-String conversion. Commonly, convert
293 * an integer of value 0 to a NULL string. The last element of
294 * _BIF and _BIX packages occasionally need this fix.
295 */
296 if (original_object->integer.value == 0) {
297
298 /* Allocate a new NULL string object */
299
300 new_object = acpi_ut_create_string_object(0);
301 if (!new_object) {
302 return (AE_NO_MEMORY);
303 }
304 } else {
305 status =
306 acpi_ex_convert_to_string(original_object,
307 &new_object,
308 ACPI_IMPLICIT_CONVERT_HEX);
309 if (ACPI_FAILURE(status)) {
310 return (status);
311 }
312 }
313 break;
314
315 case ACPI_TYPE_BUFFER:
316 /*
317 * Buffer-to-String conversion. Use a to_string
318 * conversion, no transform performed on the buffer data. The best
319 * example of this is the _BIF method, where the string data from
320 * the battery is often (incorrectly) returned as buffer object(s).
321 */
322 length = 0;
323 while ((length < original_object->buffer.length) &&
324 (original_object->buffer.pointer[length])) {
325 length++;
326 }
327
328 /* Allocate a new string object */
329
330 new_object = acpi_ut_create_string_object(length);
331 if (!new_object) {
332 return (AE_NO_MEMORY);
333 }
334
335 /*
336 * Copy the raw buffer data with no transform. String is already NULL
337 * terminated at Length+1.
338 */
339 ACPI_MEMCPY(new_object->string.pointer,
340 original_object->buffer.pointer, length);
341 break;
342
343 default:
344 return (AE_AML_OPERAND_TYPE);
345 }
346
347 *return_object = new_object;
348 return (AE_OK);
349}
350
351/*******************************************************************************
352 *
353 * FUNCTION: acpi_ns_convert_to_buffer
354 *
355 * PARAMETERS: original_object - Object to be converted
356 * return_object - Where the new converted object is returned
357 *
358 * RETURN: Status. AE_OK if conversion was successful.
359 *
360 * DESCRIPTION: Attempt to convert a Integer/String/Package object to a Buffer.
361 *
362 ******************************************************************************/
363
364static acpi_status
365acpi_ns_convert_to_buffer(union acpi_operand_object *original_object,
366 union acpi_operand_object **return_object)
367{
368 union acpi_operand_object *new_object;
369 acpi_status status;
370 union acpi_operand_object **elements;
371 u32 *dword_buffer;
372 u32 count;
373 u32 i;
374
375 switch (original_object->common.type) {
376 case ACPI_TYPE_INTEGER:
377 /*
378 * Integer-to-Buffer conversion.
379 * Convert the Integer to a packed-byte buffer. _MAT and other
380 * objects need this sometimes, if a read has been performed on a
381 * Field object that is less than or equal to the global integer
382 * size (32 or 64 bits).
383 */
384 status =
385 acpi_ex_convert_to_buffer(original_object, &new_object);
386 if (ACPI_FAILURE(status)) {
387 return (status);
388 }
389 break;
390
391 case ACPI_TYPE_STRING:
392
393 /* String-to-Buffer conversion. Simple data copy */
394
395 new_object =
396 acpi_ut_create_buffer_object(original_object->string.
397 length);
398 if (!new_object) {
399 return (AE_NO_MEMORY);
400 }
401
402 ACPI_MEMCPY(new_object->buffer.pointer,
403 original_object->string.pointer,
404 original_object->string.length);
405 break;
406
407 case ACPI_TYPE_PACKAGE:
408 /*
409 * This case is often seen for predefined names that must return a
410 * Buffer object with multiple DWORD integers within. For example,
411 * _FDE and _GTM. The Package can be converted to a Buffer.
412 */
413
414 /* All elements of the Package must be integers */
415
416 elements = original_object->package.elements;
417 count = original_object->package.count;
418
419 for (i = 0; i < count; i++) {
420 if ((!*elements) ||
421 ((*elements)->common.type != ACPI_TYPE_INTEGER)) {
422 return (AE_AML_OPERAND_TYPE);
423 }
424 elements++;
425 }
426
427 /* Create the new buffer object to replace the Package */
428
429 new_object = acpi_ut_create_buffer_object(ACPI_MUL_4(count));
430 if (!new_object) {
431 return (AE_NO_MEMORY);
432 }
433
434 /* Copy the package elements (integers) to the buffer as DWORDs */
435
436 elements = original_object->package.elements;
437 dword_buffer = ACPI_CAST_PTR(u32, new_object->buffer.pointer);
438
439 for (i = 0; i < count; i++) {
440 *dword_buffer = (u32) (*elements)->integer.value;
441 dword_buffer++;
442 elements++;
443 }
444 break;
445
446 default:
447 return (AE_AML_OPERAND_TYPE);
448 }
449
450 *return_object = new_object;
451 return (AE_OK);
452}
453
454/*******************************************************************************
455 *
456 * FUNCTION: acpi_ns_convert_to_package
457 *
458 * PARAMETERS: original_object - Object to be converted
459 * return_object - Where the new converted object is returned
460 *
461 * RETURN: Status. AE_OK if conversion was successful.
462 *
463 * DESCRIPTION: Attempt to convert a Buffer object to a Package. Each byte of
464 * the buffer is converted to a single integer package element.
465 *
466 ******************************************************************************/
467
468static acpi_status
469acpi_ns_convert_to_package(union acpi_operand_object *original_object,
470 union acpi_operand_object **return_object)
471{
472 union acpi_operand_object *new_object;
473 union acpi_operand_object **elements;
474 u32 length;
475 u8 *buffer;
476
477 switch (original_object->common.type) {
478 case ACPI_TYPE_BUFFER:
479
480 /* Buffer-to-Package conversion */
481
482 length = original_object->buffer.length;
483 new_object = acpi_ut_create_package_object(length);
484 if (!new_object) {
485 return (AE_NO_MEMORY);
486 }
487
488 /* Convert each buffer byte to an integer package element */
489
490 elements = new_object->package.elements;
491 buffer = original_object->buffer.pointer;
492
493 while (length--) {
494 *elements =
495 acpi_ut_create_integer_object((u64) *buffer);
496 if (!*elements) {
497 acpi_ut_remove_reference(new_object);
498 return (AE_NO_MEMORY);
499 }
500 elements++;
501 buffer++;
502 }
503 break;
504
505 default:
506 return (AE_AML_OPERAND_TYPE);
507 }
508
509 *return_object = new_object;
510 return (AE_OK);
511}
512
513/*******************************************************************************
514 *
515 * FUNCTION: acpi_ns_repair_null_element
516 *
517 * PARAMETERS: Data - Pointer to validation data structure
518 * expected_btypes - Object types expected
519 * package_index - Index of object within parent package (if
520 * applicable - ACPI_NOT_PACKAGE_ELEMENT
521 * otherwise)
522 * return_object_ptr - Pointer to the object returned from the
523 * evaluation of a method or object
524 *
525 * RETURN: Status. AE_OK if repair was successful.
526 *
527 * DESCRIPTION: Attempt to repair a NULL element of a returned Package object.
528 *
529 ******************************************************************************/
530
531acpi_status
532acpi_ns_repair_null_element(struct acpi_predefined_data *data,
533 u32 expected_btypes,
534 u32 package_index,
535 union acpi_operand_object **return_object_ptr)
536{
537 union acpi_operand_object *return_object = *return_object_ptr;
538 union acpi_operand_object *new_object;
539
540 ACPI_FUNCTION_NAME(ns_repair_null_element);
541
542 /* No repair needed if return object is non-NULL */
543
544 if (return_object) {
545 return (AE_OK);
546 }
547
548 /*
549 * Attempt to repair a NULL element of a Package object. This applies to
550 * predefined names that return a fixed-length package and each element
551 * is required. It does not apply to variable-length packages where NULL
552 * elements are allowed, especially at the end of the package.
553 */
554 if (expected_btypes & ACPI_RTYPE_INTEGER) {
555
556 /* Need an Integer - create a zero-value integer */
557
558 new_object = acpi_ut_create_integer_object((u64)0);
559 } else if (expected_btypes & ACPI_RTYPE_STRING) {
560
561 /* Need a String - create a NULL string */
562
563 new_object = acpi_ut_create_string_object(0);
564 } else if (expected_btypes & ACPI_RTYPE_BUFFER) {
565
566 /* Need a Buffer - create a zero-length buffer */
567
568 new_object = acpi_ut_create_buffer_object(0);
569 } else {
570 /* Error for all other expected types */
571
572 return (AE_AML_OPERAND_TYPE);
573 }
574
575 if (!new_object) {
576 return (AE_NO_MEMORY);
577 }
578
579 /* Set the reference count according to the parent Package object */
580
581 new_object->common.reference_count =
582 data->parent_package->common.reference_count;
583
584 ACPI_DEBUG_PRINT((ACPI_DB_REPAIR,
585 "%s: Converted NULL package element to expected %s at index %u\n",
586 data->pathname,
587 acpi_ut_get_object_type_name(new_object),
588 package_index));
589
590 *return_object_ptr = new_object;
591 data->flags |= ACPI_OBJECT_REPAIRED;
592 return (AE_OK);
593}
594
595/******************************************************************************
596 *
597 * FUNCTION: acpi_ns_remove_null_elements
598 *
599 * PARAMETERS: Data - Pointer to validation data structure
600 * package_type - An acpi_return_package_types value
601 * obj_desc - A Package object
602 *
603 * RETURN: None.
604 *
605 * DESCRIPTION: Remove all NULL package elements from packages that contain
606 * a variable number of sub-packages. For these types of
607 * packages, NULL elements can be safely removed.
608 *
609 *****************************************************************************/
610
611void
612acpi_ns_remove_null_elements(struct acpi_predefined_data *data,
613 u8 package_type,
614 union acpi_operand_object *obj_desc)
615{
616 union acpi_operand_object **source;
617 union acpi_operand_object **dest;
618 u32 count;
619 u32 new_count;
620 u32 i;
621
622 ACPI_FUNCTION_NAME(ns_remove_null_elements);
623
624 /*
625 * We can safely remove all NULL elements from these package types:
626 * PTYPE1_VAR packages contain a variable number of simple data types.
627 * PTYPE2 packages contain a variable number of sub-packages.
628 */
629 switch (package_type) {
630 case ACPI_PTYPE1_VAR:
631 case ACPI_PTYPE2:
632 case ACPI_PTYPE2_COUNT:
633 case ACPI_PTYPE2_PKG_COUNT:
634 case ACPI_PTYPE2_FIXED:
635 case ACPI_PTYPE2_MIN:
636 case ACPI_PTYPE2_REV_FIXED:
637 break;
638
639 default:
640 case ACPI_PTYPE1_FIXED:
641 case ACPI_PTYPE1_OPTION:
642 return;
643 }
644
645 count = obj_desc->package.count;
646 new_count = count;
647
648 source = obj_desc->package.elements;
649 dest = source;
650
651 /* Examine all elements of the package object, remove nulls */
652
653 for (i = 0; i < count; i++) {
654 if (!*source) {
655 new_count--;
656 } else {
657 *dest = *source;
658 dest++;
659 }
660 source++;
661 }
662
663 /* Update parent package if any null elements were removed */
664
665 if (new_count < count) {
666 ACPI_DEBUG_PRINT((ACPI_DB_REPAIR,
667 "%s: Found and removed %u NULL elements\n",
668 data->pathname, (count - new_count)));
669
670 /* NULL terminate list and update the package count */
671
672 *dest = NULL;
673 obj_desc->package.count = new_count;
674 }
675}
676
677/*******************************************************************************
678 *
679 * FUNCTION: acpi_ns_repair_package_list
680 *
681 * PARAMETERS: Data - Pointer to validation data structure
682 * obj_desc_ptr - Pointer to the object to repair. The new
683 * package object is returned here,
684 * overwriting the old object.
685 *
686 * RETURN: Status, new object in *obj_desc_ptr
687 *
688 * DESCRIPTION: Repair a common problem with objects that are defined to return
689 * a variable-length Package of Packages. If the variable-length
690 * is one, some BIOS code mistakenly simply declares a single
691 * Package instead of a Package with one sub-Package. This
692 * function attempts to repair this error by wrapping a Package
693 * object around the original Package, creating the correct
694 * Package with one sub-Package.
695 *
696 * Names that can be repaired in this manner include:
697 * _ALR, _CSD, _HPX, _MLS, _PRT, _PSS, _TRT, TSS
698 *
699 ******************************************************************************/
700
701acpi_status
702acpi_ns_repair_package_list(struct acpi_predefined_data *data,
703 union acpi_operand_object **obj_desc_ptr)
704{
705 union acpi_operand_object *pkg_obj_desc;
706
707 ACPI_FUNCTION_NAME(ns_repair_package_list);
708
709 /*
710 * Create the new outer package and populate it. The new package will
711 * have a single element, the lone subpackage.
712 */
713 pkg_obj_desc = acpi_ut_create_package_object(1);
714 if (!pkg_obj_desc) {
715 return (AE_NO_MEMORY);
716 }
717
718 pkg_obj_desc->package.elements[0] = *obj_desc_ptr;
719
720 /* Return the new object in the object pointer */
721
722 *obj_desc_ptr = pkg_obj_desc;
723 data->flags |= ACPI_OBJECT_REPAIRED;
724
725 ACPI_DEBUG_PRINT((ACPI_DB_REPAIR,
726 "%s: Repaired incorrectly formed Package\n",
727 data->pathname));
728
729 return (AE_OK);
730}
1// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
2/******************************************************************************
3 *
4 * Module Name: nsrepair - Repair for objects returned by predefined methods
5 *
6 * Copyright (C) 2000 - 2020, Intel Corp.
7 *
8 *****************************************************************************/
9
10#include <acpi/acpi.h>
11#include "accommon.h"
12#include "acnamesp.h"
13#include "acinterp.h"
14#include "acpredef.h"
15#include "amlresrc.h"
16
17#define _COMPONENT ACPI_NAMESPACE
18ACPI_MODULE_NAME("nsrepair")
19
20/*******************************************************************************
21 *
22 * This module attempts to repair or convert objects returned by the
23 * predefined methods to an object type that is expected, as per the ACPI
24 * specification. The need for this code is dictated by the many machines that
25 * return incorrect types for the standard predefined methods. Performing these
26 * conversions here, in one place, eliminates the need for individual ACPI
27 * device drivers to do the same. Note: Most of these conversions are different
28 * than the internal object conversion routines used for implicit object
29 * conversion.
30 *
31 * The following conversions can be performed as necessary:
32 *
33 * Integer -> String
34 * Integer -> Buffer
35 * String -> Integer
36 * String -> Buffer
37 * Buffer -> Integer
38 * Buffer -> String
39 * Buffer -> Package of Integers
40 * Package -> Package of one Package
41 *
42 * Additional conversions that are available:
43 * Convert a null return or zero return value to an end_tag descriptor
44 * Convert an ASCII string to a Unicode buffer
45 *
46 * An incorrect standalone object is wrapped with required outer package
47 *
48 * Additional possible repairs:
49 * Required package elements that are NULL replaced by Integer/String/Buffer
50 *
51 ******************************************************************************/
52/* Local prototypes */
53static const struct acpi_simple_repair_info *acpi_ns_match_simple_repair(struct
54 acpi_namespace_node
55 *node,
56 u32
57 return_btype,
58 u32
59 package_index);
60
61/*
62 * Special but simple repairs for some names.
63 *
64 * 2nd argument: Unexpected types that can be repaired
65 */
66static const struct acpi_simple_repair_info acpi_object_repair_info[] = {
67 /* Resource descriptor conversions */
68
69 {"_CRS",
70 ACPI_RTYPE_INTEGER | ACPI_RTYPE_STRING | ACPI_RTYPE_BUFFER |
71 ACPI_RTYPE_NONE,
72 ACPI_NOT_PACKAGE_ELEMENT,
73 acpi_ns_convert_to_resource},
74 {"_DMA",
75 ACPI_RTYPE_INTEGER | ACPI_RTYPE_STRING | ACPI_RTYPE_BUFFER |
76 ACPI_RTYPE_NONE,
77 ACPI_NOT_PACKAGE_ELEMENT,
78 acpi_ns_convert_to_resource},
79 {"_PRS",
80 ACPI_RTYPE_INTEGER | ACPI_RTYPE_STRING | ACPI_RTYPE_BUFFER |
81 ACPI_RTYPE_NONE,
82 ACPI_NOT_PACKAGE_ELEMENT,
83 acpi_ns_convert_to_resource},
84
85 /* Object reference conversions */
86
87 {"_DEP", ACPI_RTYPE_STRING, ACPI_ALL_PACKAGE_ELEMENTS,
88 acpi_ns_convert_to_reference},
89
90 /* Unicode conversions */
91
92 {"_MLS", ACPI_RTYPE_STRING, 1,
93 acpi_ns_convert_to_unicode},
94 {"_STR", ACPI_RTYPE_STRING | ACPI_RTYPE_BUFFER,
95 ACPI_NOT_PACKAGE_ELEMENT,
96 acpi_ns_convert_to_unicode},
97 {{0, 0, 0, 0}, 0, 0, NULL} /* Table terminator */
98};
99
100/*******************************************************************************
101 *
102 * FUNCTION: acpi_ns_simple_repair
103 *
104 * PARAMETERS: info - Method execution information block
105 * expected_btypes - Object types expected
106 * package_index - Index of object within parent package (if
107 * applicable - ACPI_NOT_PACKAGE_ELEMENT
108 * otherwise)
109 * return_object_ptr - Pointer to the object returned from the
110 * evaluation of a method or object
111 *
112 * RETURN: Status. AE_OK if repair was successful.
113 *
114 * DESCRIPTION: Attempt to repair/convert a return object of a type that was
115 * not expected.
116 *
117 ******************************************************************************/
118
119acpi_status
120acpi_ns_simple_repair(struct acpi_evaluate_info *info,
121 u32 expected_btypes,
122 u32 package_index,
123 union acpi_operand_object **return_object_ptr)
124{
125 union acpi_operand_object *return_object = *return_object_ptr;
126 union acpi_operand_object *new_object = NULL;
127 acpi_status status;
128 const struct acpi_simple_repair_info *predefined;
129
130 ACPI_FUNCTION_NAME(ns_simple_repair);
131
132 /*
133 * Special repairs for certain names that are in the repair table.
134 * Check if this name is in the list of repairable names.
135 */
136 predefined = acpi_ns_match_simple_repair(info->node,
137 info->return_btype,
138 package_index);
139 if (predefined) {
140 if (!return_object) {
141 ACPI_WARN_PREDEFINED((AE_INFO, info->full_pathname,
142 ACPI_WARN_ALWAYS,
143 "Missing expected return value"));
144 }
145
146 status = predefined->object_converter(info->node, return_object,
147 &new_object);
148 if (ACPI_FAILURE(status)) {
149
150 /* A fatal error occurred during a conversion */
151
152 ACPI_EXCEPTION((AE_INFO, status,
153 "During return object analysis"));
154 return (status);
155 }
156 if (new_object) {
157 goto object_repaired;
158 }
159 }
160
161 /*
162 * Do not perform simple object repair unless the return type is not
163 * expected.
164 */
165 if (info->return_btype & expected_btypes) {
166 return (AE_OK);
167 }
168
169 /*
170 * At this point, we know that the type of the returned object was not
171 * one of the expected types for this predefined name. Attempt to
172 * repair the object by converting it to one of the expected object
173 * types for this predefined name.
174 */
175
176 /*
177 * If there is no return value, check if we require a return value for
178 * this predefined name. Either one return value is expected, or none,
179 * for both methods and other objects.
180 *
181 * Try to fix if there was no return object. Warning if failed to fix.
182 */
183 if (!return_object) {
184 if (expected_btypes && (!(expected_btypes & ACPI_RTYPE_NONE))) {
185 if (package_index != ACPI_NOT_PACKAGE_ELEMENT) {
186 ACPI_WARN_PREDEFINED((AE_INFO,
187 info->full_pathname,
188 ACPI_WARN_ALWAYS,
189 "Found unexpected NULL package element"));
190
191 status =
192 acpi_ns_repair_null_element(info,
193 expected_btypes,
194 package_index,
195 return_object_ptr);
196 if (ACPI_SUCCESS(status)) {
197 return (AE_OK); /* Repair was successful */
198 }
199 } else {
200 ACPI_WARN_PREDEFINED((AE_INFO,
201 info->full_pathname,
202 ACPI_WARN_ALWAYS,
203 "Missing expected return value"));
204 }
205
206 return (AE_AML_NO_RETURN_VALUE);
207 }
208 }
209
210 if (expected_btypes & ACPI_RTYPE_INTEGER) {
211 status = acpi_ns_convert_to_integer(return_object, &new_object);
212 if (ACPI_SUCCESS(status)) {
213 goto object_repaired;
214 }
215 }
216 if (expected_btypes & ACPI_RTYPE_STRING) {
217 status = acpi_ns_convert_to_string(return_object, &new_object);
218 if (ACPI_SUCCESS(status)) {
219 goto object_repaired;
220 }
221 }
222 if (expected_btypes & ACPI_RTYPE_BUFFER) {
223 status = acpi_ns_convert_to_buffer(return_object, &new_object);
224 if (ACPI_SUCCESS(status)) {
225 goto object_repaired;
226 }
227 }
228 if (expected_btypes & ACPI_RTYPE_PACKAGE) {
229 /*
230 * A package is expected. We will wrap the existing object with a
231 * new package object. It is often the case that if a variable-length
232 * package is required, but there is only a single object needed, the
233 * BIOS will return that object instead of wrapping it with a Package
234 * object. Note: after the wrapping, the package will be validated
235 * for correct contents (expected object type or types).
236 */
237 status =
238 acpi_ns_wrap_with_package(info, return_object, &new_object);
239 if (ACPI_SUCCESS(status)) {
240 /*
241 * The original object just had its reference count
242 * incremented for being inserted into the new package.
243 */
244 *return_object_ptr = new_object; /* New Package object */
245 info->return_flags |= ACPI_OBJECT_REPAIRED;
246 return (AE_OK);
247 }
248 }
249
250 /* We cannot repair this object */
251
252 return (AE_AML_OPERAND_TYPE);
253
254object_repaired:
255
256 /* Object was successfully repaired */
257
258 if (package_index != ACPI_NOT_PACKAGE_ELEMENT) {
259
260 /* Update reference count of new object */
261
262 if (!(info->return_flags & ACPI_OBJECT_WRAPPED)) {
263 new_object->common.reference_count =
264 return_object->common.reference_count;
265 }
266
267 ACPI_DEBUG_PRINT((ACPI_DB_REPAIR,
268 "%s: Converted %s to expected %s at Package index %u\n",
269 info->full_pathname,
270 acpi_ut_get_object_type_name(return_object),
271 acpi_ut_get_object_type_name(new_object),
272 package_index));
273 } else {
274 ACPI_DEBUG_PRINT((ACPI_DB_REPAIR,
275 "%s: Converted %s to expected %s\n",
276 info->full_pathname,
277 acpi_ut_get_object_type_name(return_object),
278 acpi_ut_get_object_type_name(new_object)));
279 }
280
281 /* Delete old object, install the new return object */
282
283 acpi_ut_remove_reference(return_object);
284 *return_object_ptr = new_object;
285 info->return_flags |= ACPI_OBJECT_REPAIRED;
286 return (AE_OK);
287}
288
289/******************************************************************************
290 *
291 * FUNCTION: acpi_ns_match_simple_repair
292 *
293 * PARAMETERS: node - Namespace node for the method/object
294 * return_btype - Object type that was returned
295 * package_index - Index of object within parent package (if
296 * applicable - ACPI_NOT_PACKAGE_ELEMENT
297 * otherwise)
298 *
299 * RETURN: Pointer to entry in repair table. NULL indicates not found.
300 *
301 * DESCRIPTION: Check an object name against the repairable object list.
302 *
303 *****************************************************************************/
304
305static const struct acpi_simple_repair_info *acpi_ns_match_simple_repair(struct
306 acpi_namespace_node
307 *node,
308 u32
309 return_btype,
310 u32
311 package_index)
312{
313 const struct acpi_simple_repair_info *this_name;
314
315 /* Search info table for a repairable predefined method/object name */
316
317 this_name = acpi_object_repair_info;
318 while (this_name->object_converter) {
319 if (ACPI_COMPARE_NAMESEG(node->name.ascii, this_name->name)) {
320
321 /* Check if we can actually repair this name/type combination */
322
323 if ((return_btype & this_name->unexpected_btypes) &&
324 (this_name->package_index ==
325 ACPI_ALL_PACKAGE_ELEMENTS
326 || package_index == this_name->package_index)) {
327 return (this_name);
328 }
329
330 return (NULL);
331 }
332
333 this_name++;
334 }
335
336 return (NULL); /* Name was not found in the repair table */
337}
338
339/*******************************************************************************
340 *
341 * FUNCTION: acpi_ns_repair_null_element
342 *
343 * PARAMETERS: info - Method execution information block
344 * expected_btypes - Object types expected
345 * package_index - Index of object within parent package (if
346 * applicable - ACPI_NOT_PACKAGE_ELEMENT
347 * otherwise)
348 * return_object_ptr - Pointer to the object returned from the
349 * evaluation of a method or object
350 *
351 * RETURN: Status. AE_OK if repair was successful.
352 *
353 * DESCRIPTION: Attempt to repair a NULL element of a returned Package object.
354 *
355 ******************************************************************************/
356
357acpi_status
358acpi_ns_repair_null_element(struct acpi_evaluate_info *info,
359 u32 expected_btypes,
360 u32 package_index,
361 union acpi_operand_object **return_object_ptr)
362{
363 union acpi_operand_object *return_object = *return_object_ptr;
364 union acpi_operand_object *new_object;
365
366 ACPI_FUNCTION_NAME(ns_repair_null_element);
367
368 /* No repair needed if return object is non-NULL */
369
370 if (return_object) {
371 return (AE_OK);
372 }
373
374 /*
375 * Attempt to repair a NULL element of a Package object. This applies to
376 * predefined names that return a fixed-length package and each element
377 * is required. It does not apply to variable-length packages where NULL
378 * elements are allowed, especially at the end of the package.
379 */
380 if (expected_btypes & ACPI_RTYPE_INTEGER) {
381
382 /* Need an integer - create a zero-value integer */
383
384 new_object = acpi_ut_create_integer_object((u64)0);
385 } else if (expected_btypes & ACPI_RTYPE_STRING) {
386
387 /* Need a string - create a NULL string */
388
389 new_object = acpi_ut_create_string_object(0);
390 } else if (expected_btypes & ACPI_RTYPE_BUFFER) {
391
392 /* Need a buffer - create a zero-length buffer */
393
394 new_object = acpi_ut_create_buffer_object(0);
395 } else {
396 /* Error for all other expected types */
397
398 return (AE_AML_OPERAND_TYPE);
399 }
400
401 if (!new_object) {
402 return (AE_NO_MEMORY);
403 }
404
405 /* Set the reference count according to the parent Package object */
406
407 new_object->common.reference_count =
408 info->parent_package->common.reference_count;
409
410 ACPI_DEBUG_PRINT((ACPI_DB_REPAIR,
411 "%s: Converted NULL package element to expected %s at index %u\n",
412 info->full_pathname,
413 acpi_ut_get_object_type_name(new_object),
414 package_index));
415
416 *return_object_ptr = new_object;
417 info->return_flags |= ACPI_OBJECT_REPAIRED;
418 return (AE_OK);
419}
420
421/******************************************************************************
422 *
423 * FUNCTION: acpi_ns_remove_null_elements
424 *
425 * PARAMETERS: info - Method execution information block
426 * package_type - An acpi_return_package_types value
427 * obj_desc - A Package object
428 *
429 * RETURN: None.
430 *
431 * DESCRIPTION: Remove all NULL package elements from packages that contain
432 * a variable number of subpackages. For these types of
433 * packages, NULL elements can be safely removed.
434 *
435 *****************************************************************************/
436
437void
438acpi_ns_remove_null_elements(struct acpi_evaluate_info *info,
439 u8 package_type,
440 union acpi_operand_object *obj_desc)
441{
442 union acpi_operand_object **source;
443 union acpi_operand_object **dest;
444 u32 count;
445 u32 new_count;
446 u32 i;
447
448 ACPI_FUNCTION_NAME(ns_remove_null_elements);
449
450 /*
451 * We can safely remove all NULL elements from these package types:
452 * PTYPE1_VAR packages contain a variable number of simple data types.
453 * PTYPE2 packages contain a variable number of subpackages.
454 */
455 switch (package_type) {
456 case ACPI_PTYPE1_VAR:
457 case ACPI_PTYPE2:
458 case ACPI_PTYPE2_COUNT:
459 case ACPI_PTYPE2_PKG_COUNT:
460 case ACPI_PTYPE2_FIXED:
461 case ACPI_PTYPE2_MIN:
462 case ACPI_PTYPE2_REV_FIXED:
463 case ACPI_PTYPE2_FIX_VAR:
464 break;
465
466 default:
467 case ACPI_PTYPE2_VAR_VAR:
468 case ACPI_PTYPE1_FIXED:
469 case ACPI_PTYPE1_OPTION:
470 return;
471 }
472
473 count = obj_desc->package.count;
474 new_count = count;
475
476 source = obj_desc->package.elements;
477 dest = source;
478
479 /* Examine all elements of the package object, remove nulls */
480
481 for (i = 0; i < count; i++) {
482 if (!*source) {
483 new_count--;
484 } else {
485 *dest = *source;
486 dest++;
487 }
488
489 source++;
490 }
491
492 /* Update parent package if any null elements were removed */
493
494 if (new_count < count) {
495 ACPI_DEBUG_PRINT((ACPI_DB_REPAIR,
496 "%s: Found and removed %u NULL elements\n",
497 info->full_pathname, (count - new_count)));
498
499 /* NULL terminate list and update the package count */
500
501 *dest = NULL;
502 obj_desc->package.count = new_count;
503 }
504}
505
506/*******************************************************************************
507 *
508 * FUNCTION: acpi_ns_wrap_with_package
509 *
510 * PARAMETERS: info - Method execution information block
511 * original_object - Pointer to the object to repair.
512 * obj_desc_ptr - The new package object is returned here
513 *
514 * RETURN: Status, new object in *obj_desc_ptr
515 *
516 * DESCRIPTION: Repair a common problem with objects that are defined to
517 * return a variable-length Package of sub-objects. If there is
518 * only one sub-object, some BIOS code mistakenly simply declares
519 * the single object instead of a Package with one sub-object.
520 * This function attempts to repair this error by wrapping a
521 * Package object around the original object, creating the
522 * correct and expected Package with one sub-object.
523 *
524 * Names that can be repaired in this manner include:
525 * _ALR, _CSD, _HPX, _MLS, _PLD, _PRT, _PSS, _TRT, _TSS,
526 * _BCL, _DOD, _FIX, _Sx
527 *
528 ******************************************************************************/
529
530acpi_status
531acpi_ns_wrap_with_package(struct acpi_evaluate_info *info,
532 union acpi_operand_object *original_object,
533 union acpi_operand_object **obj_desc_ptr)
534{
535 union acpi_operand_object *pkg_obj_desc;
536
537 ACPI_FUNCTION_NAME(ns_wrap_with_package);
538
539 /*
540 * Create the new outer package and populate it. The new
541 * package will have a single element, the lone sub-object.
542 */
543 pkg_obj_desc = acpi_ut_create_package_object(1);
544 if (!pkg_obj_desc) {
545 return (AE_NO_MEMORY);
546 }
547
548 pkg_obj_desc->package.elements[0] = original_object;
549
550 ACPI_DEBUG_PRINT((ACPI_DB_REPAIR,
551 "%s: Wrapped %s with expected Package object\n",
552 info->full_pathname,
553 acpi_ut_get_object_type_name(original_object)));
554
555 /* Return the new object in the object pointer */
556
557 *obj_desc_ptr = pkg_obj_desc;
558 info->return_flags |= ACPI_OBJECT_REPAIRED | ACPI_OBJECT_WRAPPED;
559 return (AE_OK);
560}