1 /******************************************************************************
3 * Module Name: nspredef - Validation of ACPI predefined methods and objects
5 *****************************************************************************/
8 * Copyright (C) 2000 - 2013, Intel Corp.
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44 #define ACPI_CREATE_PREDEFINED_TABLE
46 #include <acpi/acpi.h>
51 #define _COMPONENT ACPI_NAMESPACE
52 ACPI_MODULE_NAME("nspredef")
54 /*******************************************************************************
56 * This module validates predefined ACPI objects that appear in the namespace,
57 * at the time they are evaluated (via acpi_evaluate_object). The purpose of this
58 * validation is to detect problems with BIOS-exposed predefined ACPI objects
59 * before the results are returned to the ACPI-related drivers.
61 * There are several areas that are validated:
63 * 1) The number of input arguments as defined by the method/object in the
64 * ASL is validated against the ACPI specification.
65 * 2) The type of the return object (if any) is validated against the ACPI
67 * 3) For returned package objects, the count of package elements is
68 * validated, as well as the type of each package element. Nested
69 * packages are supported.
71 * For any problems found, a warning message is issued.
73 ******************************************************************************/
74 /* Local prototypes */
76 acpi_ns_check_reference(struct acpi_evaluate_info *info,
77 union acpi_operand_object *return_object);
79 static u32 acpi_ns_get_bitmapped_type(union acpi_operand_object *return_object);
81 /*******************************************************************************
83 * FUNCTION: acpi_ns_check_return_value
85 * PARAMETERS: node - Namespace node for the method/object
86 * info - Method execution information block
87 * user_param_count - Number of parameters actually passed
88 * return_status - Status from the object evaluation
89 * return_object_ptr - Pointer to the object returned from the
90 * evaluation of a method or object
94 * DESCRIPTION: Check the value returned from a predefined name.
96 ******************************************************************************/
99 acpi_ns_check_return_value(struct acpi_namespace_node *node,
100 struct acpi_evaluate_info *info,
101 u32 user_param_count,
102 acpi_status return_status,
103 union acpi_operand_object **return_object_ptr)
106 const union acpi_predefined_info *predefined;
108 /* If not a predefined name, we cannot validate the return object */
110 predefined = info->predefined;
116 * If the method failed or did not actually return an object, we cannot
117 * validate the return object
119 if ((return_status != AE_OK) && (return_status != AE_CTRL_RETURN_VALUE)) {
124 * Return value validation and possible repair.
126 * 1) Don't perform return value validation/repair if this feature
127 * has been disabled via a global option.
129 * 2) We have a return value, but if one wasn't expected, just exit,
130 * this is not a problem. For example, if the "Implicit Return"
131 * feature is enabled, methods will always return a value.
133 * 3) If the return value can be of any type, then we cannot perform
134 * any validation, just exit.
136 if (acpi_gbl_disable_auto_repair ||
137 (!predefined->info.expected_btypes) ||
138 (predefined->info.expected_btypes == ACPI_RTYPE_ALL)) {
143 * Check that the type of the main return object is what is expected
144 * for this predefined name
146 status = acpi_ns_check_object_type(info, return_object_ptr,
147 predefined->info.expected_btypes,
148 ACPI_NOT_PACKAGE_ELEMENT);
149 if (ACPI_FAILURE(status)) {
154 * For returned Package objects, check the type of all sub-objects.
155 * Note: Package may have been newly created by call above.
157 if ((*return_object_ptr)->common.type == ACPI_TYPE_PACKAGE) {
158 info->parent_package = *return_object_ptr;
159 status = acpi_ns_check_package(info, return_object_ptr);
160 if (ACPI_FAILURE(status)) {
162 /* We might be able to fix some errors */
164 if ((status != AE_AML_OPERAND_TYPE) &&
165 (status != AE_AML_OPERAND_VALUE)) {
172 * The return object was OK, or it was successfully repaired above.
173 * Now make some additional checks such as verifying that package
174 * objects are sorted correctly (if required) or buffer objects have
175 * the correct data width (bytes vs. dwords). These repairs are
176 * performed on a per-name basis, i.e., the code is specific to
177 * particular predefined names.
179 status = acpi_ns_complex_repairs(info, node, status, return_object_ptr);
183 * If the object validation failed or if we successfully repaired one
184 * or more objects, mark the parent node to suppress further warning
185 * messages during the next evaluation of the same method/object.
187 if (ACPI_FAILURE(status) || (info->return_flags & ACPI_OBJECT_REPAIRED)) {
188 node->flags |= ANOBJ_EVALUATED;
194 /*******************************************************************************
196 * FUNCTION: acpi_ns_check_object_type
198 * PARAMETERS: info - Method execution information block
199 * return_object_ptr - Pointer to the object returned from the
200 * evaluation of a method or object
201 * expected_btypes - Bitmap of expected return type(s)
202 * package_index - Index of object within parent package (if
203 * applicable - ACPI_NOT_PACKAGE_ELEMENT
208 * DESCRIPTION: Check the type of the return object against the expected object
209 * type(s). Use of Btype allows multiple expected object types.
211 ******************************************************************************/
214 acpi_ns_check_object_type(struct acpi_evaluate_info *info,
215 union acpi_operand_object **return_object_ptr,
216 u32 expected_btypes, u32 package_index)
218 union acpi_operand_object *return_object = *return_object_ptr;
219 acpi_status status = AE_OK;
220 char type_buffer[48]; /* Room for 5 types */
222 /* A Namespace node should not get here, but make sure */
225 ACPI_GET_DESCRIPTOR_TYPE(return_object) == ACPI_DESC_TYPE_NAMED) {
226 ACPI_WARN_PREDEFINED((AE_INFO, info->full_pathname,
228 "Invalid return type - Found a Namespace node [%4.4s] type %s",
229 return_object->node.name.ascii,
230 acpi_ut_get_type_name(return_object->node.
232 return (AE_AML_OPERAND_TYPE);
236 * Convert the object type (ACPI_TYPE_xxx) to a bitmapped object type.
237 * The bitmapped type allows multiple possible return types.
239 * Note, the cases below must handle all of the possible types returned
240 * from all of the predefined names (including elements of returned
243 info->return_btype = acpi_ns_get_bitmapped_type(return_object);
244 if (info->return_btype == ACPI_RTYPE_ANY) {
246 /* Not one of the supported objects, must be incorrect */
247 goto type_error_exit;
250 /* For reference objects, check that the reference type is correct */
252 if ((info->return_btype & expected_btypes) == ACPI_RTYPE_REFERENCE) {
253 status = acpi_ns_check_reference(info, return_object);
257 /* Attempt simple repair of the returned object if necessary */
259 status = acpi_ns_simple_repair(info, expected_btypes,
260 package_index, return_object_ptr);
261 if (ACPI_SUCCESS(status)) {
262 return (AE_OK); /* Successful repair */
267 /* Create a string with all expected types for this predefined object */
269 acpi_ut_get_expected_return_types(type_buffer, expected_btypes);
271 if (package_index == ACPI_NOT_PACKAGE_ELEMENT) {
272 ACPI_WARN_PREDEFINED((AE_INFO, info->full_pathname,
274 "Return type mismatch - found %s, expected %s",
275 acpi_ut_get_object_type_name
276 (return_object), type_buffer));
278 ACPI_WARN_PREDEFINED((AE_INFO, info->full_pathname,
280 "Return Package type mismatch at index %u - "
281 "found %s, expected %s", package_index,
282 acpi_ut_get_object_type_name
283 (return_object), type_buffer));
286 return (AE_AML_OPERAND_TYPE);
289 /*******************************************************************************
291 * FUNCTION: acpi_ns_check_reference
293 * PARAMETERS: info - Method execution information block
294 * return_object - Object returned from the evaluation of a
299 * DESCRIPTION: Check a returned reference object for the correct reference
300 * type. The only reference type that can be returned from a
301 * predefined method is a named reference. All others are invalid.
303 ******************************************************************************/
306 acpi_ns_check_reference(struct acpi_evaluate_info *info,
307 union acpi_operand_object *return_object)
311 * Check the reference object for the correct reference type (opcode).
312 * The only type of reference that can be converted to an union acpi_object is
313 * a reference to a named object (reference class: NAME)
315 if (return_object->reference.class == ACPI_REFCLASS_NAME) {
319 ACPI_WARN_PREDEFINED((AE_INFO, info->full_pathname, info->node_flags,
320 "Return type mismatch - unexpected reference object type [%s] %2.2X",
321 acpi_ut_get_reference_name(return_object),
322 return_object->reference.class));
324 return (AE_AML_OPERAND_TYPE);
327 /*******************************************************************************
329 * FUNCTION: acpi_ns_get_bitmapped_type
331 * PARAMETERS: return_object - Object returned from method/obj evaluation
333 * RETURN: Object return type. ACPI_RTYPE_ANY indicates that the object
334 * type is not supported. ACPI_RTYPE_NONE indicates that no
335 * object was returned (return_object is NULL).
337 * DESCRIPTION: Convert object type into a bitmapped object return type.
339 ******************************************************************************/
341 static u32 acpi_ns_get_bitmapped_type(union acpi_operand_object *return_object)
345 if (!return_object) {
346 return (ACPI_RTYPE_NONE);
349 /* Map acpi_object_type to internal bitmapped type */
351 switch (return_object->common.type) {
352 case ACPI_TYPE_INTEGER:
354 return_btype = ACPI_RTYPE_INTEGER;
357 case ACPI_TYPE_BUFFER:
359 return_btype = ACPI_RTYPE_BUFFER;
362 case ACPI_TYPE_STRING:
364 return_btype = ACPI_RTYPE_STRING;
367 case ACPI_TYPE_PACKAGE:
369 return_btype = ACPI_RTYPE_PACKAGE;
372 case ACPI_TYPE_LOCAL_REFERENCE:
374 return_btype = ACPI_RTYPE_REFERENCE;
379 /* Not one of the supported objects, must be incorrect */
381 return_btype = ACPI_RTYPE_ANY;
385 return (return_btype);