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ARM: dts: sirf: add missed chhifbg node in prima2 and atlas6 dts
[linux-2.6.git] / drivers / acpi / acpica / nsprepkg.c
blob6d55cef7916c4ba4715a9108697073822edc48ec
1 /******************************************************************************
2 *
3 * Module Name: nsprepkg - Validation of package objects for predefined names
4 *
5 *****************************************************************************/
6
7 /*
8 * Copyright (C) 2000 - 2013, 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 "acpredef.h"
48
49 #define _COMPONENT ACPI_NAMESPACE
50 ACPI_MODULE_NAME("nsprepkg")
51
52 /* Local prototypes */
53 static acpi_status
54 acpi_ns_check_package_list(struct acpi_evaluate_info *info,
55 const union acpi_predefined_info *package,
56 union acpi_operand_object **elements, u32 count);
57
58 static acpi_status
59 acpi_ns_check_package_elements(struct acpi_evaluate_info *info,
60 union acpi_operand_object **elements,
61 u8 type1,
62 u32 count1,
63 u8 type2, u32 count2, u32 start_index);
64
65 /*******************************************************************************
66 *
67 * FUNCTION: acpi_ns_check_package
68 *
69 * PARAMETERS: info - Method execution information block
70 * return_object_ptr - Pointer to the object returned from the
71 * evaluation of a method or object
72 *
73 * RETURN: Status
74 *
75 * DESCRIPTION: Check a returned package object for the correct count and
76 * correct type of all sub-objects.
77 *
78 ******************************************************************************/
79
80 acpi_status
81 acpi_ns_check_package(struct acpi_evaluate_info *info,
82 union acpi_operand_object **return_object_ptr)
83 {
84 union acpi_operand_object *return_object = *return_object_ptr;
85 const union acpi_predefined_info *package;
86 union acpi_operand_object **elements;
87 acpi_status status = AE_OK;
88 u32 expected_count;
89 u32 count;
90 u32 i;
91
92 ACPI_FUNCTION_NAME(ns_check_package);
93
94 /* The package info for this name is in the next table entry */
95
96 package = info->predefined + 1;
97
98 ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
99 "%s Validating return Package of Type %X, Count %X\n",
100 info->full_pathname, package->ret_info.type,
101 return_object->package.count));
102
103 /*
104 * For variable-length Packages, we can safely remove all embedded
105 * and trailing NULL package elements
106 */
107 acpi_ns_remove_null_elements(info, package->ret_info.type,
108 return_object);
109
110 /* Extract package count and elements array */
111
112 elements = return_object->package.elements;
113 count = return_object->package.count;
114
115 /*
116 * Most packages must have at least one element. The only exception
117 * is the variable-length package (ACPI_PTYPE1_VAR).
118 */
119 if (!count) {
120 if (package->ret_info.type == ACPI_PTYPE1_VAR) {
121 return (AE_OK);
122 }
123
124 ACPI_WARN_PREDEFINED((AE_INFO, info->full_pathname,
125 info->node_flags,
126 "Return Package has no elements (empty)"));
127
128 return (AE_AML_OPERAND_VALUE);
129 }
130
131 /*
132 * Decode the type of the expected package contents
133 *
134 * PTYPE1 packages contain no subpackages
135 * PTYPE2 packages contain sub-packages
136 */
137 switch (package->ret_info.type) {
138 case ACPI_PTYPE1_FIXED:
139 /*
140 * The package count is fixed and there are no sub-packages
141 *
142 * If package is too small, exit.
143 * If package is larger than expected, issue warning but continue
144 */
145 expected_count =
146 package->ret_info.count1 + package->ret_info.count2;
147 if (count < expected_count) {
148 goto package_too_small;
149 } else if (count > expected_count) {
150 ACPI_DEBUG_PRINT((ACPI_DB_REPAIR,
151 "%s: Return Package is larger than needed - "
152 "found %u, expected %u\n",
153 info->full_pathname, count,
154 expected_count));
155 }
156
157 /* Validate all elements of the returned package */
158
159 status = acpi_ns_check_package_elements(info, elements,
160 package->ret_info.
161 object_type1,
162 package->ret_info.
163 count1,
164 package->ret_info.
165 object_type2,
166 package->ret_info.
167 count2, 0);
168 break;
169
170 case ACPI_PTYPE1_VAR:
171 /*
172 * The package count is variable, there are no sub-packages, and all
173 * elements must be of the same type
174 */
175 for (i = 0; i < count; i++) {
176 status = acpi_ns_check_object_type(info, elements,
177 package->ret_info.
178 object_type1, i);
179 if (ACPI_FAILURE(status)) {
180 return (status);
181 }
182 elements++;
183 }
184 break;
185
186 case ACPI_PTYPE1_OPTION:
187 /*
188 * The package count is variable, there are no sub-packages. There are
189 * a fixed number of required elements, and a variable number of
190 * optional elements.
191 *
192 * Check if package is at least as large as the minimum required
193 */
194 expected_count = package->ret_info3.count;
195 if (count < expected_count) {
196 goto package_too_small;
197 }
198
199 /* Variable number of sub-objects */
200
201 for (i = 0; i < count; i++) {
202 if (i < package->ret_info3.count) {
203
204 /* These are the required package elements (0, 1, or 2) */
205
206 status =
207 acpi_ns_check_object_type(info, elements,
208 package->
209 ret_info3.
210 object_type[i],
211 i);
212 if (ACPI_FAILURE(status)) {
213 return (status);
214 }
215 } else {
216 /* These are the optional package elements */
217
218 status =
219 acpi_ns_check_object_type(info, elements,
220 package->
221 ret_info3.
222 tail_object_type,
223 i);
224 if (ACPI_FAILURE(status)) {
225 return (status);
226 }
227 }
228 elements++;
229 }
230 break;
231
232 case ACPI_PTYPE2_REV_FIXED:
233
234 /* First element is the (Integer) revision */
235
236 status = acpi_ns_check_object_type(info, elements,
237 ACPI_RTYPE_INTEGER, 0);
238 if (ACPI_FAILURE(status)) {
239 return (status);
240 }
241
242 elements++;
243 count--;
244
245 /* Examine the sub-packages */
246
247 status =
248 acpi_ns_check_package_list(info, package, elements, count);
249 break;
250
251 case ACPI_PTYPE2_PKG_COUNT:
252
253 /* First element is the (Integer) count of sub-packages to follow */
254
255 status = acpi_ns_check_object_type(info, elements,
256 ACPI_RTYPE_INTEGER, 0);
257 if (ACPI_FAILURE(status)) {
258 return (status);
259 }
260
261 /*
262 * Count cannot be larger than the parent package length, but allow it
263 * to be smaller. The >= accounts for the Integer above.
264 */
265 expected_count = (u32)(*elements)->integer.value;
266 if (expected_count >= count) {
267 goto package_too_small;
268 }
269
270 count = expected_count;
271 elements++;
272
273 /* Examine the sub-packages */
274
275 status =
276 acpi_ns_check_package_list(info, package, elements, count);
277 break;
278
279 case ACPI_PTYPE2:
280 case ACPI_PTYPE2_FIXED:
281 case ACPI_PTYPE2_MIN:
282 case ACPI_PTYPE2_COUNT:
283 case ACPI_PTYPE2_FIX_VAR:
284 /*
285 * These types all return a single Package that consists of a
286 * variable number of sub-Packages.
287 *
288 * First, ensure that the first element is a sub-Package. If not,
289 * the BIOS may have incorrectly returned the object as a single
290 * package instead of a Package of Packages (a common error if
291 * there is only one entry). We may be able to repair this by
292 * wrapping the returned Package with a new outer Package.
293 */
294 if (*elements
295 && ((*elements)->common.type != ACPI_TYPE_PACKAGE)) {
296
297 /* Create the new outer package and populate it */
298
299 status =
300 acpi_ns_wrap_with_package(info, return_object,
301 return_object_ptr);
302 if (ACPI_FAILURE(status)) {
303 return (status);
304 }
305
306 /* Update locals to point to the new package (of 1 element) */
307
308 return_object = *return_object_ptr;
309 elements = return_object->package.elements;
310 count = 1;
311 }
312
313 /* Examine the sub-packages */
314
315 status =
316 acpi_ns_check_package_list(info, package, elements, count);
317 break;
318
319 default:
320
321 /* Should not get here if predefined info table is correct */
322
323 ACPI_WARN_PREDEFINED((AE_INFO, info->full_pathname,
324 info->node_flags,
325 "Invalid internal return type in table entry: %X",
326 package->ret_info.type));
327
328 return (AE_AML_INTERNAL);
329 }
330
331 return (status);
332
333 package_too_small:
334
335 /* Error exit for the case with an incorrect package count */
336
337 ACPI_WARN_PREDEFINED((AE_INFO, info->full_pathname, info->node_flags,
338 "Return Package is too small - found %u elements, expected %u",
339 count, expected_count));
340
341 return (AE_AML_OPERAND_VALUE);
342 }
343
344 /*******************************************************************************
345 *
346 * FUNCTION: acpi_ns_check_package_list
347 *
348 * PARAMETERS: info - Method execution information block
349 * package - Pointer to package-specific info for method
350 * elements - Element list of parent package. All elements
351 * of this list should be of type Package.
352 * count - Count of subpackages
353 *
354 * RETURN: Status
355 *
356 * DESCRIPTION: Examine a list of subpackages
357 *
358 ******************************************************************************/
359
360 static acpi_status
361 acpi_ns_check_package_list(struct acpi_evaluate_info *info,
362 const union acpi_predefined_info *package,
363 union acpi_operand_object **elements, u32 count)
364 {
365 union acpi_operand_object *sub_package;
366 union acpi_operand_object **sub_elements;
367 acpi_status status;
368 u32 expected_count;
369 u32 i;
370 u32 j;
371
372 /*
373 * Validate each sub-Package in the parent Package
374 *
375 * NOTE: assumes list of sub-packages contains no NULL elements.
376 * Any NULL elements should have been removed by earlier call
377 * to acpi_ns_remove_null_elements.
378 */
379 for (i = 0; i < count; i++) {
380 sub_package = *elements;
381 sub_elements = sub_package->package.elements;
382 info->parent_package = sub_package;
383
384 /* Each sub-object must be of type Package */
385
386 status = acpi_ns_check_object_type(info, &sub_package,
387 ACPI_RTYPE_PACKAGE, i);
388 if (ACPI_FAILURE(status)) {
389 return (status);
390 }
391
392 /* Examine the different types of expected sub-packages */
393
394 info->parent_package = sub_package;
395 switch (package->ret_info.type) {
396 case ACPI_PTYPE2:
397 case ACPI_PTYPE2_PKG_COUNT:
398 case ACPI_PTYPE2_REV_FIXED:
399
400 /* Each subpackage has a fixed number of elements */
401
402 expected_count =
403 package->ret_info.count1 + package->ret_info.count2;
404 if (sub_package->package.count < expected_count) {
405 goto package_too_small;
406 }
407
408 status =
409 acpi_ns_check_package_elements(info, sub_elements,
410 package->ret_info.
411 object_type1,
412 package->ret_info.
413 count1,
414 package->ret_info.
415 object_type2,
416 package->ret_info.
417 count2, 0);
418 if (ACPI_FAILURE(status)) {
419 return (status);
420 }
421 break;
422
423 case ACPI_PTYPE2_FIX_VAR:
424 /*
425 * Each subpackage has a fixed number of elements and an
426 * optional element
427 */
428 expected_count =
429 package->ret_info.count1 + package->ret_info.count2;
430 if (sub_package->package.count < expected_count) {
431 goto package_too_small;
432 }
433
434 status =
435 acpi_ns_check_package_elements(info, sub_elements,
436 package->ret_info.
437 object_type1,
438 package->ret_info.
439 count1,
440 package->ret_info.
441 object_type2,
442 sub_package->package.
443 count -
444 package->ret_info.
445 count1, 0);
446 if (ACPI_FAILURE(status)) {
447 return (status);
448 }
449 break;
450
451 case ACPI_PTYPE2_FIXED:
452
453 /* Each sub-package has a fixed length */
454
455 expected_count = package->ret_info2.count;
456 if (sub_package->package.count < expected_count) {
457 goto package_too_small;
458 }
459
460 /* Check the type of each sub-package element */
461
462 for (j = 0; j < expected_count; j++) {
463 status =
464 acpi_ns_check_object_type(info,
465 &sub_elements[j],
466 package->
467 ret_info2.
468 object_type[j],
469 j);
470 if (ACPI_FAILURE(status)) {
471 return (status);
472 }
473 }
474 break;
475
476 case ACPI_PTYPE2_MIN:
477
478 /* Each sub-package has a variable but minimum length */
479
480 expected_count = package->ret_info.count1;
481 if (sub_package->package.count < expected_count) {
482 goto package_too_small;
483 }
484
485 /* Check the type of each sub-package element */
486
487 status =
488 acpi_ns_check_package_elements(info, sub_elements,
489 package->ret_info.
490 object_type1,
491 sub_package->package.
492 count, 0, 0, 0);
493 if (ACPI_FAILURE(status)) {
494 return (status);
495 }
496 break;
497
498 case ACPI_PTYPE2_COUNT:
499 /*
500 * First element is the (Integer) count of elements, including
501 * the count field (the ACPI name is num_elements)
502 */
503 status = acpi_ns_check_object_type(info, sub_elements,
504 ACPI_RTYPE_INTEGER,
505 0);
506 if (ACPI_FAILURE(status)) {
507 return (status);
508 }
509
510 /*
511 * Make sure package is large enough for the Count and is
512 * is as large as the minimum size
513 */
514 expected_count = (u32)(*sub_elements)->integer.value;
515 if (sub_package->package.count < expected_count) {
516 goto package_too_small;
517 }
518 if (sub_package->package.count <
519 package->ret_info.count1) {
520 expected_count = package->ret_info.count1;
521 goto package_too_small;
522 }
523 if (expected_count == 0) {
524 /*
525 * Either the num_entries element was originally zero or it was
526 * a NULL element and repaired to an Integer of value zero.
527 * In either case, repair it by setting num_entries to be the
528 * actual size of the subpackage.
529 */
530 expected_count = sub_package->package.count;
531 (*sub_elements)->integer.value = expected_count;
532 }
533
534 /* Check the type of each sub-package element */
535
536 status =
537 acpi_ns_check_package_elements(info,
538 (sub_elements + 1),
539 package->ret_info.
540 object_type1,
541 (expected_count - 1),
542 0, 0, 1);
543 if (ACPI_FAILURE(status)) {
544 return (status);
545 }
546 break;
547
548 default: /* Should not get here, type was validated by caller */
549
550 return (AE_AML_INTERNAL);
551 }
552
553 elements++;
554 }
555
556 return (AE_OK);
557
558 package_too_small:
559
560 /* The sub-package count was smaller than required */
561
562 ACPI_WARN_PREDEFINED((AE_INFO, info->full_pathname, info->node_flags,
563 "Return Sub-Package[%u] is too small - found %u elements, expected %u",
564 i, sub_package->package.count, expected_count));
565
566 return (AE_AML_OPERAND_VALUE);
567 }
568
569 /*******************************************************************************
570 *
571 * FUNCTION: acpi_ns_check_package_elements
572 *
573 * PARAMETERS: info - Method execution information block
574 * elements - Pointer to the package elements array
575 * type1 - Object type for first group
576 * count1 - Count for first group
577 * type2 - Object type for second group
578 * count2 - Count for second group
579 * start_index - Start of the first group of elements
580 *
581 * RETURN: Status
582 *
583 * DESCRIPTION: Check that all elements of a package are of the correct object
584 * type. Supports up to two groups of different object types.
585 *
586 ******************************************************************************/
587
588 static acpi_status
589 acpi_ns_check_package_elements(struct acpi_evaluate_info *info,
590 union acpi_operand_object **elements,
591 u8 type1,
592 u32 count1,
593 u8 type2, u32 count2, u32 start_index)
594 {
595 union acpi_operand_object **this_element = elements;
596 acpi_status status;
597 u32 i;
598
599 /*
600 * Up to two groups of package elements are supported by the data
601 * structure. All elements in each group must be of the same type.
602 * The second group can have a count of zero.
603 */
604 for (i = 0; i < count1; i++) {
605 status = acpi_ns_check_object_type(info, this_element,
606 type1, i + start_index);
607 if (ACPI_FAILURE(status)) {
608 return (status);
609 }
610 this_element++;
611 }
612
613 for (i = 0; i < count2; i++) {
614 status = acpi_ns_check_object_type(info, this_element,
615 type2,
616 (i + count1 + start_index));
617 if (ACPI_FAILURE(status)) {
618 return (status);
619 }
620 this_element++;
621 }
622
623 return (AE_OK);
624 }
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