1/****************************************************************************** 2 * 3 * Module Name: nspredef - Validation of ACPI predefined methods and objects 4 * 5 *****************************************************************************/ 6 7/* 8 * Copyright (C) 2000 - 2014, 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#define ACPI_CREATE_PREDEFINED_TABLE 45 46#include <acpi/acpi.h> 47#include "accommon.h" 48#include "acnamesp.h" 49#include "acpredef.h" 50 51#define _COMPONENT ACPI_NAMESPACE 52ACPI_MODULE_NAME("nspredef") 53 54/******************************************************************************* 55 * 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. 60 * 61 * There are several areas that are validated: 62 * 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 66 * specification. 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. 70 * 71 * For any problems found, a warning message is issued. 72 * 73 ******************************************************************************/ 74/* Local prototypes */ 75static acpi_status 76acpi_ns_check_reference(struct acpi_evaluate_info *info, 77 union acpi_operand_object *return_object); 78 79static u32 acpi_ns_get_bitmapped_type(union acpi_operand_object *return_object); 80 81/******************************************************************************* 82 * 83 * FUNCTION: acpi_ns_check_return_value 84 * 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 91 * 92 * RETURN: Status 93 * 94 * DESCRIPTION: Check the value returned from a predefined name. 95 * 96 ******************************************************************************/ 97 98acpi_status 99acpi_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) 104{ 105 acpi_status status; 106 const union acpi_predefined_info *predefined; 107 108 /* If not a predefined name, we cannot validate the return object */ 109 110 predefined = info->predefined; 111 if (!predefined) { 112 return (AE_OK); 113 } 114 115 /* 116 * If the method failed or did not actually return an object, we cannot 117 * validate the return object 118 */ 119 if ((return_status != AE_OK) && (return_status != AE_CTRL_RETURN_VALUE)) { 120 return (AE_OK); 121 } 122 123 /* 124 * Return value validation and possible repair. 125 * 126 * 1) Don't perform return value validation/repair if this feature 127 * has been disabled via a global option. 128 * 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. 132 * 133 * 3) If the return value can be of any type, then we cannot perform 134 * any validation, just exit. 135 */ 136 if (acpi_gbl_disable_auto_repair || 137 (!predefined->info.expected_btypes) || 138 (predefined->info.expected_btypes == ACPI_RTYPE_ALL)) { 139 return (AE_OK); 140 } 141 142 /* 143 * Check that the type of the main return object is what is expected 144 * for this predefined name 145 */ 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)) { 150 goto exit; 151 } 152 153 /* 154 * 155 * 4) If there is no return value and it is optional, just return 156 * AE_OK (_WAK). 157 */ 158 if (!(*return_object_ptr)) { 159 goto exit; 160 } 161 162 /* 163 * For returned Package objects, check the type of all sub-objects. 164 * Note: Package may have been newly created by call above. 165 */ 166 if ((*return_object_ptr)->common.type == ACPI_TYPE_PACKAGE) { 167 info->parent_package = *return_object_ptr; 168 status = acpi_ns_check_package(info, return_object_ptr); 169 if (ACPI_FAILURE(status)) { 170 171 /* We might be able to fix some errors */ 172 173 if ((status != AE_AML_OPERAND_TYPE) && 174 (status != AE_AML_OPERAND_VALUE)) { 175 goto exit; 176 } 177 } 178 } 179 180 /* 181 * The return object was OK, or it was successfully repaired above. 182 * Now make some additional checks such as verifying that package 183 * objects are sorted correctly (if required) or buffer objects have 184 * the correct data width (bytes vs. dwords). These repairs are 185 * performed on a per-name basis, i.e., the code is specific to 186 * particular predefined names. 187 */ 188 status = acpi_ns_complex_repairs(info, node, status, return_object_ptr); 189 190exit: 191 /* 192 * If the object validation failed or if we successfully repaired one 193 * or more objects, mark the parent node to suppress further warning 194 * messages during the next evaluation of the same method/object. 195 */ 196 if (ACPI_FAILURE(status) || (info->return_flags & ACPI_OBJECT_REPAIRED)) { 197 node->flags |= ANOBJ_EVALUATED; 198 } 199 200 return (status); 201} 202 203/******************************************************************************* 204 * 205 * FUNCTION: acpi_ns_check_object_type 206 * 207 * PARAMETERS: info - Method execution information block 208 * return_object_ptr - Pointer to the object returned from the 209 * evaluation of a method or object 210 * expected_btypes - Bitmap of expected return type(s) 211 * package_index - Index of object within parent package (if 212 * applicable - ACPI_NOT_PACKAGE_ELEMENT 213 * otherwise) 214 * 215 * RETURN: Status 216 * 217 * DESCRIPTION: Check the type of the return object against the expected object 218 * type(s). Use of Btype allows multiple expected object types. 219 * 220 ******************************************************************************/ 221 222acpi_status 223acpi_ns_check_object_type(struct acpi_evaluate_info *info, 224 union acpi_operand_object **return_object_ptr, 225 u32 expected_btypes, u32 package_index) 226{ 227 union acpi_operand_object *return_object = *return_object_ptr; 228 acpi_status status = AE_OK; 229 char type_buffer[48]; /* Room for 5 types */ 230 231 /* A Namespace node should not get here, but make sure */ 232 233 if (return_object && 234 ACPI_GET_DESCRIPTOR_TYPE(return_object) == ACPI_DESC_TYPE_NAMED) { 235 ACPI_WARN_PREDEFINED((AE_INFO, info->full_pathname, 236 info->node_flags, 237 "Invalid return type - Found a Namespace node [%4.4s] type %s", 238 return_object->node.name.ascii, 239 acpi_ut_get_type_name(return_object->node. 240 type))); 241 return (AE_AML_OPERAND_TYPE); 242 } 243 244 /* 245 * Convert the object type (ACPI_TYPE_xxx) to a bitmapped object type. 246 * The bitmapped type allows multiple possible return types. 247 * 248 * Note, the cases below must handle all of the possible types returned 249 * from all of the predefined names (including elements of returned 250 * packages) 251 */ 252 info->return_btype = acpi_ns_get_bitmapped_type(return_object); 253 if (info->return_btype == ACPI_RTYPE_ANY) { 254 255 /* Not one of the supported objects, must be incorrect */ 256 goto type_error_exit; 257 } 258 259 /* For reference objects, check that the reference type is correct */ 260 261 if ((info->return_btype & expected_btypes) == ACPI_RTYPE_REFERENCE) { 262 status = acpi_ns_check_reference(info, return_object); 263 return (status); 264 } 265 266 /* Attempt simple repair of the returned object if necessary */ 267 268 status = acpi_ns_simple_repair(info, expected_btypes, 269 package_index, return_object_ptr); 270 if (ACPI_SUCCESS(status)) { 271 return (AE_OK); /* Successful repair */ 272 } 273 274type_error_exit: 275 276 /* Create a string with all expected types for this predefined object */ 277 278 acpi_ut_get_expected_return_types(type_buffer, expected_btypes); 279 280 if (!return_object) { 281 ACPI_WARN_PREDEFINED((AE_INFO, info->full_pathname, 282 info->node_flags, 283 "Expected return object of type %s", 284 type_buffer)); 285 } else if (package_index == ACPI_NOT_PACKAGE_ELEMENT) { 286 ACPI_WARN_PREDEFINED((AE_INFO, info->full_pathname, 287 info->node_flags, 288 "Return type mismatch - found %s, expected %s", 289 acpi_ut_get_object_type_name 290 (return_object), type_buffer)); 291 } else { 292 ACPI_WARN_PREDEFINED((AE_INFO, info->full_pathname, 293 info->node_flags, 294 "Return Package type mismatch at index %u - " 295 "found %s, expected %s", package_index, 296 acpi_ut_get_object_type_name 297 (return_object), type_buffer)); 298 } 299 300 return (AE_AML_OPERAND_TYPE); 301} 302 303/******************************************************************************* 304 * 305 * FUNCTION: acpi_ns_check_reference 306 * 307 * PARAMETERS: info - Method execution information block 308 * return_object - Object returned from the evaluation of a 309 * method or object 310 * 311 * RETURN: Status 312 * 313 * DESCRIPTION: Check a returned reference object for the correct reference 314 * type. The only reference type that can be returned from a 315 * predefined method is a named reference. All others are invalid. 316 * 317 ******************************************************************************/ 318 319static acpi_status 320acpi_ns_check_reference(struct acpi_evaluate_info *info, 321 union acpi_operand_object *return_object) 322{ 323 324 /* 325 * Check the reference object for the correct reference type (opcode). 326 * The only type of reference that can be converted to an union acpi_object is 327 * a reference to a named object (reference class: NAME) 328 */ 329 if (return_object->reference.class == ACPI_REFCLASS_NAME) { 330 return (AE_OK); 331 } 332 333 ACPI_WARN_PREDEFINED((AE_INFO, info->full_pathname, info->node_flags, 334 "Return type mismatch - unexpected reference object type [%s] %2.2X", 335 acpi_ut_get_reference_name(return_object), 336 return_object->reference.class)); 337 338 return (AE_AML_OPERAND_TYPE); 339} 340 341/******************************************************************************* 342 * 343 * FUNCTION: acpi_ns_get_bitmapped_type 344 * 345 * PARAMETERS: return_object - Object returned from method/obj evaluation 346 * 347 * RETURN: Object return type. ACPI_RTYPE_ANY indicates that the object 348 * type is not supported. ACPI_RTYPE_NONE indicates that no 349 * object was returned (return_object is NULL). 350 * 351 * DESCRIPTION: Convert object type into a bitmapped object return type. 352 * 353 ******************************************************************************/ 354 355static u32 acpi_ns_get_bitmapped_type(union acpi_operand_object *return_object) 356{ 357 u32 return_btype; 358 359 if (!return_object) { 360 return (ACPI_RTYPE_NONE); 361 } 362 363 /* Map acpi_object_type to internal bitmapped type */ 364 365 switch (return_object->common.type) { 366 case ACPI_TYPE_INTEGER: 367 368 return_btype = ACPI_RTYPE_INTEGER; 369 break; 370 371 case ACPI_TYPE_BUFFER: 372 373 return_btype = ACPI_RTYPE_BUFFER; 374 break; 375 376 case ACPI_TYPE_STRING: 377 378 return_btype = ACPI_RTYPE_STRING; 379 break; 380 381 case ACPI_TYPE_PACKAGE: 382 383 return_btype = ACPI_RTYPE_PACKAGE; 384 break; 385 386 case ACPI_TYPE_LOCAL_REFERENCE: 387 388 return_btype = ACPI_RTYPE_REFERENCE; 389 break; 390 391 default: 392 393 /* Not one of the supported objects, must be incorrect */ 394 395 return_btype = ACPI_RTYPE_ANY; 396 break; 397 } 398 399 return (return_btype); 400} 401