1 /******************************************************************************
3 * Module Name: nsprepkg - Validation of package objects for predefined names
5 *****************************************************************************/
8 * Copyright (C) 2000 - 2015, Intel Corp.
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44 #include <acpi/acpi.h>
49 #define _COMPONENT ACPI_NAMESPACE
50 ACPI_MODULE_NAME("nsprepkg")
52 /* Local prototypes */
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);
59 acpi_ns_check_package_elements(struct acpi_evaluate_info *info,
60 union acpi_operand_object **elements,
63 u8 type2, u32 count2, u32 start_index);
65 /*******************************************************************************
67 * FUNCTION: acpi_ns_check_package
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
75 * DESCRIPTION: Check a returned package object for the correct count and
76 * correct type of all sub-objects.
78 ******************************************************************************/
81 acpi_ns_check_package(struct acpi_evaluate_info *info,
82 union acpi_operand_object **return_object_ptr)
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;
92 ACPI_FUNCTION_NAME(ns_check_package);
94 /* The package info for this name is in the next table entry */
96 package = info->predefined + 1;
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));
104 * For variable-length Packages, we can safely remove all embedded
105 * and trailing NULL package elements
107 acpi_ns_remove_null_elements(info, package->ret_info.type,
110 /* Extract package count and elements array */
112 elements = return_object->package.elements;
113 count = return_object->package.count;
116 * Most packages must have at least one element. The only exception
117 * is the variable-length package (ACPI_PTYPE1_VAR).
120 if (package->ret_info.type == ACPI_PTYPE1_VAR) {
124 ACPI_WARN_PREDEFINED((AE_INFO, info->full_pathname,
126 "Return Package has no elements (empty)"));
128 return (AE_AML_OPERAND_VALUE);
132 * Decode the type of the expected package contents
134 * PTYPE1 packages contain no subpackages
135 * PTYPE2 packages contain subpackages
137 switch (package->ret_info.type) {
138 case ACPI_PTYPE1_FIXED:
140 * The package count is fixed and there are no subpackages
142 * If package is too small, exit.
143 * If package is larger than expected, issue warning but continue
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,
157 /* Validate all elements of the returned package */
159 status = acpi_ns_check_package_elements(info, elements,
170 case ACPI_PTYPE1_VAR:
172 * The package count is variable, there are no subpackages, and all
173 * elements must be of the same type
175 for (i = 0; i < count; i++) {
176 status = acpi_ns_check_object_type(info, elements,
179 if (ACPI_FAILURE(status)) {
186 case ACPI_PTYPE1_OPTION:
188 * The package count is variable, there are no subpackages. There are
189 * a fixed number of required elements, and a variable number of
192 * Check if package is at least as large as the minimum required
194 expected_count = package->ret_info3.count;
195 if (count < expected_count) {
196 goto package_too_small;
199 /* Variable number of sub-objects */
201 for (i = 0; i < count; i++) {
202 if (i < package->ret_info3.count) {
204 /* These are the required package elements (0, 1, or 2) */
207 acpi_ns_check_object_type(info, elements,
212 if (ACPI_FAILURE(status)) {
216 /* These are the optional package elements */
219 acpi_ns_check_object_type(info, elements,
224 if (ACPI_FAILURE(status)) {
232 case ACPI_PTYPE2_REV_FIXED:
234 /* First element is the (Integer) revision */
236 status = acpi_ns_check_object_type(info, elements,
237 ACPI_RTYPE_INTEGER, 0);
238 if (ACPI_FAILURE(status)) {
245 /* Examine the subpackages */
248 acpi_ns_check_package_list(info, package, elements, count);
251 case ACPI_PTYPE2_PKG_COUNT:
253 /* First element is the (Integer) count of subpackages to follow */
255 status = acpi_ns_check_object_type(info, elements,
256 ACPI_RTYPE_INTEGER, 0);
257 if (ACPI_FAILURE(status)) {
262 * Count cannot be larger than the parent package length, but allow it
263 * to be smaller. The >= accounts for the Integer above.
265 expected_count = (u32)(*elements)->integer.value;
266 if (expected_count >= count) {
267 goto package_too_small;
270 count = expected_count;
273 /* Examine the subpackages */
276 acpi_ns_check_package_list(info, package, elements, count);
280 case ACPI_PTYPE2_FIXED:
281 case ACPI_PTYPE2_MIN:
282 case ACPI_PTYPE2_COUNT:
283 case ACPI_PTYPE2_FIX_VAR:
285 * These types all return a single Package that consists of a
286 * variable number of subpackages.
288 * First, ensure that the first element is a subpackage. 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.
295 && ((*elements)->common.type != ACPI_TYPE_PACKAGE)) {
297 /* Create the new outer package and populate it */
300 acpi_ns_wrap_with_package(info, return_object,
302 if (ACPI_FAILURE(status)) {
306 /* Update locals to point to the new package (of 1 element) */
308 return_object = *return_object_ptr;
309 elements = return_object->package.elements;
313 /* Examine the subpackages */
316 acpi_ns_check_package_list(info, package, elements, count);
319 case ACPI_PTYPE2_UUID_PAIR:
321 /* The package must contain pairs of (UUID + type) */
324 expected_count = count + 1;
325 goto package_too_small;
329 status = acpi_ns_check_object_type(info, elements,
332 if (ACPI_FAILURE(status)) {
336 /* Validate length of the UUID buffer */
338 if ((*elements)->buffer.length != 16) {
339 ACPI_WARN_PREDEFINED((AE_INFO,
342 "Invalid length for UUID Buffer"));
343 return (AE_AML_OPERAND_VALUE);
346 status = acpi_ns_check_object_type(info, elements + 1,
349 if (ACPI_FAILURE(status)) {
360 /* Should not get here if predefined info table is correct */
362 ACPI_WARN_PREDEFINED((AE_INFO, info->full_pathname,
364 "Invalid internal return type in table entry: %X",
365 package->ret_info.type));
367 return (AE_AML_INTERNAL);
374 /* Error exit for the case with an incorrect package count */
376 ACPI_WARN_PREDEFINED((AE_INFO, info->full_pathname, info->node_flags,
377 "Return Package is too small - found %u elements, expected %u",
378 count, expected_count));
380 return (AE_AML_OPERAND_VALUE);
383 /*******************************************************************************
385 * FUNCTION: acpi_ns_check_package_list
387 * PARAMETERS: info - Method execution information block
388 * package - Pointer to package-specific info for method
389 * elements - Element list of parent package. All elements
390 * of this list should be of type Package.
391 * count - Count of subpackages
395 * DESCRIPTION: Examine a list of subpackages
397 ******************************************************************************/
400 acpi_ns_check_package_list(struct acpi_evaluate_info *info,
401 const union acpi_predefined_info *package,
402 union acpi_operand_object **elements, u32 count)
404 union acpi_operand_object *sub_package;
405 union acpi_operand_object **sub_elements;
412 * Validate each subpackage in the parent Package
414 * NOTE: assumes list of subpackages contains no NULL elements.
415 * Any NULL elements should have been removed by earlier call
416 * to acpi_ns_remove_null_elements.
418 for (i = 0; i < count; i++) {
419 sub_package = *elements;
420 sub_elements = sub_package->package.elements;
421 info->parent_package = sub_package;
423 /* Each sub-object must be of type Package */
425 status = acpi_ns_check_object_type(info, &sub_package,
426 ACPI_RTYPE_PACKAGE, i);
427 if (ACPI_FAILURE(status)) {
431 /* Examine the different types of expected subpackages */
433 info->parent_package = sub_package;
434 switch (package->ret_info.type) {
436 case ACPI_PTYPE2_PKG_COUNT:
437 case ACPI_PTYPE2_REV_FIXED:
439 /* Each subpackage has a fixed number of elements */
442 package->ret_info.count1 + package->ret_info.count2;
443 if (sub_package->package.count < expected_count) {
444 goto package_too_small;
448 acpi_ns_check_package_elements(info, sub_elements,
457 if (ACPI_FAILURE(status)) {
462 case ACPI_PTYPE2_FIX_VAR:
464 * Each subpackage has a fixed number of elements and an
468 package->ret_info.count1 + package->ret_info.count2;
469 if (sub_package->package.count < expected_count) {
470 goto package_too_small;
474 acpi_ns_check_package_elements(info, sub_elements,
481 sub_package->package.
485 if (ACPI_FAILURE(status)) {
490 case ACPI_PTYPE2_FIXED:
492 /* Each subpackage has a fixed length */
494 expected_count = package->ret_info2.count;
495 if (sub_package->package.count < expected_count) {
496 goto package_too_small;
499 /* Check the type of each subpackage element */
501 for (j = 0; j < expected_count; j++) {
503 acpi_ns_check_object_type(info,
509 if (ACPI_FAILURE(status)) {
515 case ACPI_PTYPE2_MIN:
517 /* Each subpackage has a variable but minimum length */
519 expected_count = package->ret_info.count1;
520 if (sub_package->package.count < expected_count) {
521 goto package_too_small;
524 /* Check the type of each subpackage element */
527 acpi_ns_check_package_elements(info, sub_elements,
530 sub_package->package.
532 if (ACPI_FAILURE(status)) {
537 case ACPI_PTYPE2_COUNT:
539 * First element is the (Integer) count of elements, including
540 * the count field (the ACPI name is num_elements)
542 status = acpi_ns_check_object_type(info, sub_elements,
545 if (ACPI_FAILURE(status)) {
550 * Make sure package is large enough for the Count and is
551 * is as large as the minimum size
553 expected_count = (u32)(*sub_elements)->integer.value;
554 if (sub_package->package.count < expected_count) {
555 goto package_too_small;
557 if (sub_package->package.count <
558 package->ret_info.count1) {
559 expected_count = package->ret_info.count1;
560 goto package_too_small;
562 if (expected_count == 0) {
564 * Either the num_entries element was originally zero or it was
565 * a NULL element and repaired to an Integer of value zero.
566 * In either case, repair it by setting num_entries to be the
567 * actual size of the subpackage.
569 expected_count = sub_package->package.count;
570 (*sub_elements)->integer.value = expected_count;
573 /* Check the type of each subpackage element */
576 acpi_ns_check_package_elements(info,
580 (expected_count - 1),
582 if (ACPI_FAILURE(status)) {
587 default: /* Should not get here, type was validated by caller */
589 return (AE_AML_INTERNAL);
599 /* The subpackage count was smaller than required */
601 ACPI_WARN_PREDEFINED((AE_INFO, info->full_pathname, info->node_flags,
602 "Return SubPackage[%u] is too small - found %u elements, expected %u",
603 i, sub_package->package.count, expected_count));
605 return (AE_AML_OPERAND_VALUE);
608 /*******************************************************************************
610 * FUNCTION: acpi_ns_check_package_elements
612 * PARAMETERS: info - Method execution information block
613 * elements - Pointer to the package elements array
614 * type1 - Object type for first group
615 * count1 - Count for first group
616 * type2 - Object type for second group
617 * count2 - Count for second group
618 * start_index - Start of the first group of elements
622 * DESCRIPTION: Check that all elements of a package are of the correct object
623 * type. Supports up to two groups of different object types.
625 ******************************************************************************/
628 acpi_ns_check_package_elements(struct acpi_evaluate_info *info,
629 union acpi_operand_object **elements,
632 u8 type2, u32 count2, u32 start_index)
634 union acpi_operand_object **this_element = elements;
639 * Up to two groups of package elements are supported by the data
640 * structure. All elements in each group must be of the same type.
641 * The second group can have a count of zero.
643 for (i = 0; i < count1; i++) {
644 status = acpi_ns_check_object_type(info, this_element,
645 type1, i + start_index);
646 if (ACPI_FAILURE(status)) {
652 for (i = 0; i < count2; i++) {
653 status = acpi_ns_check_object_type(info, this_element,
655 (i + count1 + start_index));
656 if (ACPI_FAILURE(status)) {