1 /******************************************************************************
3 * Module Name: nspredef - Validation of ACPI predefined methods and objects
6 *****************************************************************************/
9 * Copyright (C) 2000 - 2008, Intel Corp.
10 * All rights reserved.
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
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21 * including a substantially similar Disclaimer requirement for further
22 * binary redistribution.
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24 * of any contributors may be used to endorse or promote products derived
25 * from this software without specific prior written permission.
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45 #include <acpi/acpi.h>
50 #define _COMPONENT ACPI_NAMESPACE
51 ACPI_MODULE_NAME("nspredef")
53 /*******************************************************************************
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.
60 * There are several areas that are validated:
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
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.
70 * For any problems found, a warning message is issued.
72 ******************************************************************************/
73 /* Local prototypes */
75 acpi_ns_check_package(struct acpi_predefined_data *data,
76 union acpi_operand_object **return_object_ptr);
79 acpi_ns_check_package_elements(struct acpi_predefined_data *data,
80 union acpi_operand_object **elements,
83 u8 type2, u32 count2, u32 start_index);
86 acpi_ns_check_object_type(struct acpi_predefined_data *data,
87 union acpi_operand_object **return_object_ptr,
88 u32 expected_btypes, u32 package_index);
91 acpi_ns_check_reference(struct acpi_predefined_data *data,
92 union acpi_operand_object *return_object);
94 static void acpi_ns_get_expected_types(char *buffer, u32 expected_btypes);
97 * Names for the types that can be returned by the predefined objects.
98 * Used for warning messages. Must be in the same order as the ACPI_RTYPEs
100 static const char *acpi_rtype_names[] = {
108 /*******************************************************************************
110 * FUNCTION: acpi_ns_check_predefined_names
112 * PARAMETERS: Node - Namespace node for the method/object
113 * user_param_count - Number of parameters actually passed
114 * return_status - Status from the object evaluation
115 * return_object_ptr - Pointer to the object returned from the
116 * evaluation of a method or object
120 * DESCRIPTION: Check an ACPI name for a match in the predefined name list.
122 ******************************************************************************/
125 acpi_ns_check_predefined_names(struct acpi_namespace_node *node,
126 u32 user_param_count,
127 acpi_status return_status,
128 union acpi_operand_object **return_object_ptr)
130 union acpi_operand_object *return_object = *return_object_ptr;
131 acpi_status status = AE_OK;
132 const union acpi_predefined_info *predefined;
134 struct acpi_predefined_data *data;
136 /* Match the name for this method/object against the predefined list */
138 predefined = acpi_ns_check_for_predefined_name(node);
140 /* Get the full pathname to the object, for use in warning messages */
142 pathname = acpi_ns_get_external_pathname(node);
144 return AE_OK; /* Could not get pathname, ignore */
148 * Check that the parameter count for this method matches the ASL
149 * definition. For predefined names, ensure that both the caller and
150 * the method itself are in accordance with the ACPI specification.
152 acpi_ns_check_parameter_count(pathname, node, user_param_count,
155 /* If not a predefined name, we cannot validate the return object */
162 * If the method failed or did not actually return an object, we cannot
163 * validate the return object
165 if ((return_status != AE_OK) && (return_status != AE_CTRL_RETURN_VALUE)) {
170 * If there is no return value, check if we require a return value for
171 * this predefined name. Either one return value is expected, or none,
172 * for both methods and other objects.
174 * Exit now if there is no return object. Warning if one was expected.
176 if (!return_object) {
177 if ((predefined->info.expected_btypes) &&
178 (!(predefined->info.expected_btypes & ACPI_RTYPE_NONE))) {
179 ACPI_WARN_PREDEFINED((AE_INFO, pathname,
181 "Missing expected return value"));
183 status = AE_AML_NO_RETURN_VALUE;
189 * We have a return value, but if one wasn't expected, just exit, this is
190 * not a problem. For example, if the "Implicit Return" feature is
191 * enabled, methods will always return a value.
193 if (!predefined->info.expected_btypes) {
197 /* Create the parameter data block for object validation */
199 data = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_predefined_data));
203 data->predefined = predefined;
204 data->node_flags = node->flags;
205 data->pathname = pathname;
208 * Check that the type of the return object is what is expected for
209 * this predefined name
211 status = acpi_ns_check_object_type(data, return_object_ptr,
212 predefined->info.expected_btypes,
213 ACPI_NOT_PACKAGE_ELEMENT);
214 if (ACPI_FAILURE(status)) {
215 goto check_validation_status;
218 /* For returned Package objects, check the type of all sub-objects */
220 if (return_object->common.type == ACPI_TYPE_PACKAGE) {
221 status = acpi_ns_check_package(data, return_object_ptr);
224 check_validation_status:
226 * If the object validation failed or if we successfully repaired one
227 * or more objects, mark the parent node to suppress further warning
228 * messages during the next evaluation of the same method/object.
230 if (ACPI_FAILURE(status) || (data->flags & ACPI_OBJECT_REPAIRED)) {
231 node->flags |= ANOBJ_EVALUATED;
240 /*******************************************************************************
242 * FUNCTION: acpi_ns_check_parameter_count
244 * PARAMETERS: Pathname - Full pathname to the node (for error msgs)
245 * Node - Namespace node for the method/object
246 * user_param_count - Number of args passed in by the caller
247 * Predefined - Pointer to entry in predefined name table
251 * DESCRIPTION: Check that the declared (in ASL/AML) parameter count for a
252 * predefined name is what is expected (i.e., what is defined in
253 * the ACPI specification for this predefined name.)
255 ******************************************************************************/
258 acpi_ns_check_parameter_count(char *pathname,
259 struct acpi_namespace_node *node,
260 u32 user_param_count,
261 const union acpi_predefined_info *predefined)
264 u32 required_params_current;
265 u32 required_params_old;
267 /* Methods have 0-7 parameters. All other types have zero. */
270 if (node->type == ACPI_TYPE_METHOD) {
271 param_count = node->object->method.param_count;
276 * Check the parameter count for non-predefined methods/objects.
278 * Warning if too few or too many arguments have been passed by the
279 * caller. An incorrect number of arguments may not cause the method
280 * to fail. However, the method will fail if there are too few
281 * arguments and the method attempts to use one of the missing ones.
283 if (user_param_count < param_count) {
284 ACPI_WARN_PREDEFINED((AE_INFO, pathname,
286 "Insufficient arguments - needs %u, found %u",
287 param_count, user_param_count));
288 } else if (user_param_count > param_count) {
289 ACPI_WARN_PREDEFINED((AE_INFO, pathname,
291 "Excess arguments - needs %u, found %u",
292 param_count, user_param_count));
298 * Validate the user-supplied parameter count.
299 * Allow two different legal argument counts (_SCP, etc.)
301 required_params_current = predefined->info.param_count & 0x0F;
302 required_params_old = predefined->info.param_count >> 4;
304 if (user_param_count != ACPI_UINT32_MAX) {
305 if ((user_param_count != required_params_current) &&
306 (user_param_count != required_params_old)) {
307 ACPI_WARN_PREDEFINED((AE_INFO, pathname,
309 "Parameter count mismatch - "
310 "caller passed %u, ACPI requires %u",
312 required_params_current));
317 * Check that the ASL-defined parameter count is what is expected for
318 * this predefined name (parameter count as defined by the ACPI
321 if ((param_count != required_params_current) &&
322 (param_count != required_params_old)) {
323 ACPI_WARN_PREDEFINED((AE_INFO, pathname, node->flags,
324 "Parameter count mismatch - ASL declared %u, ACPI requires %u",
325 param_count, required_params_current));
329 /*******************************************************************************
331 * FUNCTION: acpi_ns_check_for_predefined_name
333 * PARAMETERS: Node - Namespace node for the method/object
335 * RETURN: Pointer to entry in predefined table. NULL indicates not found.
337 * DESCRIPTION: Check an object name against the predefined object list.
339 ******************************************************************************/
341 const union acpi_predefined_info *acpi_ns_check_for_predefined_name(struct
345 const union acpi_predefined_info *this_name;
347 /* Quick check for a predefined name, first character must be underscore */
349 if (node->name.ascii[0] != '_') {
353 /* Search info table for a predefined method/object name */
355 this_name = predefined_names;
356 while (this_name->info.name[0]) {
357 if (ACPI_COMPARE_NAME(node->name.ascii, this_name->info.name)) {
362 * Skip next entry in the table if this name returns a Package
363 * (next entry contains the package info)
365 if (this_name->info.expected_btypes & ACPI_RTYPE_PACKAGE) {
372 return (NULL); /* Not found */
375 /*******************************************************************************
377 * FUNCTION: acpi_ns_check_package
379 * PARAMETERS: Data - Pointer to validation data structure
380 * return_object_ptr - Pointer to the object returned from the
381 * evaluation of a method or object
385 * DESCRIPTION: Check a returned package object for the correct count and
386 * correct type of all sub-objects.
388 ******************************************************************************/
391 acpi_ns_check_package(struct acpi_predefined_data *data,
392 union acpi_operand_object **return_object_ptr)
394 union acpi_operand_object *return_object = *return_object_ptr;
395 const union acpi_predefined_info *package;
396 union acpi_operand_object *sub_package;
397 union acpi_operand_object **elements;
398 union acpi_operand_object **sub_elements;
405 ACPI_FUNCTION_NAME(ns_check_package);
407 /* The package info for this name is in the next table entry */
409 package = data->predefined + 1;
411 ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
412 "%s Validating return Package of Type %X, Count %X\n",
413 data->pathname, package->ret_info.type,
414 return_object->package.count));
416 /* Extract package count and elements array */
418 elements = return_object->package.elements;
419 count = return_object->package.count;
421 /* The package must have at least one element, else invalid */
424 ACPI_WARN_PREDEFINED((AE_INFO, data->pathname, data->node_flags,
425 "Return Package has no elements (empty)"));
427 return (AE_AML_OPERAND_VALUE);
431 * Decode the type of the expected package contents
433 * PTYPE1 packages contain no subpackages
434 * PTYPE2 packages contain sub-packages
436 switch (package->ret_info.type) {
437 case ACPI_PTYPE1_FIXED:
440 * The package count is fixed and there are no sub-packages
442 * If package is too small, exit.
443 * If package is larger than expected, issue warning but continue
446 package->ret_info.count1 + package->ret_info.count2;
447 if (count < expected_count) {
448 goto package_too_small;
449 } else if (count > expected_count) {
450 ACPI_WARN_PREDEFINED((AE_INFO, data->pathname,
452 "Return Package is larger than needed - "
453 "found %u, expected %u", count,
457 /* Validate all elements of the returned package */
459 status = acpi_ns_check_package_elements(data, elements,
468 if (ACPI_FAILURE(status)) {
473 case ACPI_PTYPE1_VAR:
476 * The package count is variable, there are no sub-packages, and all
477 * elements must be of the same type
479 for (i = 0; i < count; i++) {
480 status = acpi_ns_check_object_type(data, elements,
483 if (ACPI_FAILURE(status)) {
490 case ACPI_PTYPE1_OPTION:
493 * The package count is variable, there are no sub-packages. There are
494 * a fixed number of required elements, and a variable number of
497 * Check if package is at least as large as the minimum required
499 expected_count = package->ret_info3.count;
500 if (count < expected_count) {
501 goto package_too_small;
504 /* Variable number of sub-objects */
506 for (i = 0; i < count; i++) {
507 if (i < package->ret_info3.count) {
509 /* These are the required package elements (0, 1, or 2) */
512 acpi_ns_check_object_type(data, elements,
517 if (ACPI_FAILURE(status)) {
521 /* These are the optional package elements */
524 acpi_ns_check_object_type(data, elements,
529 if (ACPI_FAILURE(status)) {
537 case ACPI_PTYPE2_PKG_COUNT:
539 /* First element is the (Integer) count of sub-packages to follow */
541 status = acpi_ns_check_object_type(data, elements,
542 ACPI_RTYPE_INTEGER, 0);
543 if (ACPI_FAILURE(status)) {
548 * Count cannot be larger than the parent package length, but allow it
549 * to be smaller. The >= accounts for the Integer above.
551 expected_count = (u32) (*elements)->integer.value;
552 if (expected_count >= count) {
553 goto package_too_small;
556 count = expected_count;
559 /* Now we can walk the sub-packages */
561 /*lint -fallthrough */
564 case ACPI_PTYPE2_FIXED:
565 case ACPI_PTYPE2_MIN:
566 case ACPI_PTYPE2_COUNT:
569 * These types all return a single Package that consists of a
570 * variable number of sub-Packages.
572 * First, ensure that the first element is a sub-Package. If not,
573 * the BIOS may have incorrectly returned the object as a single
574 * package instead of a Package of Packages (a common error if
575 * there is only one entry). We may be able to repair this by
576 * wrapping the returned Package with a new outer Package.
578 if ((*elements)->common.type != ACPI_TYPE_PACKAGE) {
580 /* Create the new outer package and populate it */
583 acpi_ns_repair_package_list(data,
585 if (ACPI_FAILURE(status)) {
589 /* Update locals to point to the new package (of 1 element) */
591 return_object = *return_object_ptr;
592 elements = return_object->package.elements;
596 /* Validate each sub-Package in the parent Package */
598 for (i = 0; i < count; i++) {
599 sub_package = *elements;
600 sub_elements = sub_package->package.elements;
602 /* Each sub-object must be of type Package */
604 status = acpi_ns_check_object_type(data, &sub_package,
607 if (ACPI_FAILURE(status)) {
611 /* Examine the different types of sub-packages */
613 switch (package->ret_info.type) {
615 case ACPI_PTYPE2_PKG_COUNT:
617 /* Each subpackage has a fixed number of elements */
620 package->ret_info.count1 +
621 package->ret_info.count2;
622 if (sub_package->package.count !=
624 count = sub_package->package.count;
625 goto package_too_small;
629 acpi_ns_check_package_elements(data,
643 if (ACPI_FAILURE(status)) {
648 case ACPI_PTYPE2_FIXED:
650 /* Each sub-package has a fixed length */
652 expected_count = package->ret_info2.count;
653 if (sub_package->package.count < expected_count) {
654 count = sub_package->package.count;
655 goto package_too_small;
658 /* Check the type of each sub-package element */
660 for (j = 0; j < expected_count; j++) {
662 acpi_ns_check_object_type(data,
664 package->ret_info2.object_type[j], j);
665 if (ACPI_FAILURE(status)) {
671 case ACPI_PTYPE2_MIN:
673 /* Each sub-package has a variable but minimum length */
675 expected_count = package->ret_info.count1;
676 if (sub_package->package.count < expected_count) {
677 count = sub_package->package.count;
678 goto package_too_small;
681 /* Check the type of each sub-package element */
684 acpi_ns_check_package_elements(data,
693 if (ACPI_FAILURE(status)) {
698 case ACPI_PTYPE2_COUNT:
700 /* First element is the (Integer) count of elements to follow */
703 acpi_ns_check_object_type(data,
707 if (ACPI_FAILURE(status)) {
711 /* Make sure package is large enough for the Count */
714 (u32) (*sub_elements)->integer.value;
715 if (sub_package->package.count < expected_count) {
716 count = sub_package->package.count;
717 goto package_too_small;
720 /* Check the type of each sub-package element */
723 acpi_ns_check_package_elements(data,
732 if (ACPI_FAILURE(status)) {
747 /* Should not get here if predefined info table is correct */
749 ACPI_WARN_PREDEFINED((AE_INFO, data->pathname, data->node_flags,
750 "Invalid internal return type in table entry: %X",
751 package->ret_info.type));
753 return (AE_AML_INTERNAL);
760 /* Error exit for the case with an incorrect package count */
762 ACPI_WARN_PREDEFINED((AE_INFO, data->pathname, data->node_flags,
763 "Return Package is too small - found %u, expected %u",
764 count, expected_count));
766 return (AE_AML_OPERAND_VALUE);
769 /*******************************************************************************
771 * FUNCTION: acpi_ns_check_package_elements
773 * PARAMETERS: Data - Pointer to validation data structure
774 * Elements - Pointer to the package elements array
775 * Type1 - Object type for first group
776 * Count1 - Count for first group
777 * Type2 - Object type for second group
778 * Count2 - Count for second group
779 * start_index - Start of the first group of elements
783 * DESCRIPTION: Check that all elements of a package are of the correct object
784 * type. Supports up to two groups of different object types.
786 ******************************************************************************/
789 acpi_ns_check_package_elements(struct acpi_predefined_data *data,
790 union acpi_operand_object **elements,
793 u8 type2, u32 count2, u32 start_index)
795 union acpi_operand_object **this_element = elements;
800 * Up to two groups of package elements are supported by the data
801 * structure. All elements in each group must be of the same type.
802 * The second group can have a count of zero.
804 for (i = 0; i < count1; i++) {
805 status = acpi_ns_check_object_type(data, this_element,
806 type1, i + start_index);
807 if (ACPI_FAILURE(status)) {
813 for (i = 0; i < count2; i++) {
814 status = acpi_ns_check_object_type(data, this_element,
816 (i + count1 + start_index));
817 if (ACPI_FAILURE(status)) {
826 /*******************************************************************************
828 * FUNCTION: acpi_ns_check_object_type
830 * PARAMETERS: Data - Pointer to validation data structure
831 * return_object_ptr - Pointer to the object returned from the
832 * evaluation of a method or object
833 * expected_btypes - Bitmap of expected return type(s)
834 * package_index - Index of object within parent package (if
835 * applicable - ACPI_NOT_PACKAGE_ELEMENT
840 * DESCRIPTION: Check the type of the return object against the expected object
841 * type(s). Use of Btype allows multiple expected object types.
843 ******************************************************************************/
846 acpi_ns_check_object_type(struct acpi_predefined_data *data,
847 union acpi_operand_object **return_object_ptr,
848 u32 expected_btypes, u32 package_index)
850 union acpi_operand_object *return_object = *return_object_ptr;
851 acpi_status status = AE_OK;
853 char type_buffer[48]; /* Room for 5 types */
856 * If we get a NULL return_object here, it is a NULL package element,
857 * and this is always an error.
859 if (!return_object) {
860 goto type_error_exit;
863 /* A Namespace node should not get here, but make sure */
865 if (ACPI_GET_DESCRIPTOR_TYPE(return_object) == ACPI_DESC_TYPE_NAMED) {
866 ACPI_WARN_PREDEFINED((AE_INFO, data->pathname, data->node_flags,
867 "Invalid return type - Found a Namespace node [%4.4s] type %s",
868 return_object->node.name.ascii,
869 acpi_ut_get_type_name(return_object->node.
871 return (AE_AML_OPERAND_TYPE);
875 * Convert the object type (ACPI_TYPE_xxx) to a bitmapped object type.
876 * The bitmapped type allows multiple possible return types.
878 * Note, the cases below must handle all of the possible types returned
879 * from all of the predefined names (including elements of returned
882 switch (return_object->common.type) {
883 case ACPI_TYPE_INTEGER:
884 return_btype = ACPI_RTYPE_INTEGER;
887 case ACPI_TYPE_BUFFER:
888 return_btype = ACPI_RTYPE_BUFFER;
891 case ACPI_TYPE_STRING:
892 return_btype = ACPI_RTYPE_STRING;
895 case ACPI_TYPE_PACKAGE:
896 return_btype = ACPI_RTYPE_PACKAGE;
899 case ACPI_TYPE_LOCAL_REFERENCE:
900 return_btype = ACPI_RTYPE_REFERENCE;
904 /* Not one of the supported objects, must be incorrect */
906 goto type_error_exit;
909 /* Is the object one of the expected types? */
911 if (!(return_btype & expected_btypes)) {
913 /* Type mismatch -- attempt repair of the returned object */
915 status = acpi_ns_repair_object(data, expected_btypes,
918 if (ACPI_SUCCESS(status)) {
919 return (AE_OK); /* Repair was successful */
921 goto type_error_exit;
924 /* For reference objects, check that the reference type is correct */
926 if (return_object->common.type == ACPI_TYPE_LOCAL_REFERENCE) {
927 status = acpi_ns_check_reference(data, return_object);
934 /* Create a string with all expected types for this predefined object */
936 acpi_ns_get_expected_types(type_buffer, expected_btypes);
938 if (package_index == ACPI_NOT_PACKAGE_ELEMENT) {
939 ACPI_WARN_PREDEFINED((AE_INFO, data->pathname, data->node_flags,
940 "Return type mismatch - found %s, expected %s",
941 acpi_ut_get_object_type_name
942 (return_object), type_buffer));
944 ACPI_WARN_PREDEFINED((AE_INFO, data->pathname, data->node_flags,
945 "Return Package type mismatch at index %u - "
946 "found %s, expected %s", package_index,
947 acpi_ut_get_object_type_name
948 (return_object), type_buffer));
951 return (AE_AML_OPERAND_TYPE);
954 /*******************************************************************************
956 * FUNCTION: acpi_ns_check_reference
958 * PARAMETERS: Data - Pointer to validation data structure
959 * return_object - Object returned from the evaluation of a
964 * DESCRIPTION: Check a returned reference object for the correct reference
965 * type. The only reference type that can be returned from a
966 * predefined method is a named reference. All others are invalid.
968 ******************************************************************************/
971 acpi_ns_check_reference(struct acpi_predefined_data *data,
972 union acpi_operand_object *return_object)
976 * Check the reference object for the correct reference type (opcode).
977 * The only type of reference that can be converted to an union acpi_object is
978 * a reference to a named object (reference class: NAME)
980 if (return_object->reference.class == ACPI_REFCLASS_NAME) {
984 ACPI_WARN_PREDEFINED((AE_INFO, data->pathname, data->node_flags,
985 "Return type mismatch - unexpected reference object type [%s] %2.2X",
986 acpi_ut_get_reference_name(return_object),
987 return_object->reference.class));
989 return (AE_AML_OPERAND_TYPE);
992 /*******************************************************************************
994 * FUNCTION: acpi_ns_get_expected_types
996 * PARAMETERS: Buffer - Pointer to where the string is returned
997 * expected_btypes - Bitmap of expected return type(s)
999 * RETURN: Buffer is populated with type names.
1001 * DESCRIPTION: Translate the expected types bitmap into a string of ascii
1002 * names of expected types, for use in warning messages.
1004 ******************************************************************************/
1006 static void acpi_ns_get_expected_types(char *buffer, u32 expected_btypes)
1014 this_rtype = ACPI_RTYPE_INTEGER;
1016 for (i = 0; i < ACPI_NUM_RTYPES; i++) {
1018 /* If one of the expected types, concatenate the name of this type */
1020 if (expected_btypes & this_rtype) {
1021 ACPI_STRCAT(buffer, &acpi_rtype_names[i][j]);
1022 j = 0; /* Use name separator from now on */
1024 this_rtype <<= 1; /* Next Rtype */