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   1 /******************************************************************************
   2  *
   3  * Module Name: nspredef - Validation of ACPI predefined methods and objects
   4  *              $Revision: 1.1 $
   5  *
   6  *****************************************************************************/
   7
   8 /*
   9  * Copyright (C) 2000 - 2008, Intel Corp.
  10  * All rights reserved.
  11  *
  12  * Redistribution and use in source and binary forms, with or without
  13  * modification, are permitted provided that the following conditions
  14  * are met:
  15  * 1. Redistributions of source code must retain the above copyright
  16  *    notice, this list of conditions, and the following disclaimer,
  17  *    without modification.
  18  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  19  *    substantially similar to the "NO WARRANTY" disclaimer below
  20  *    ("Disclaimer") and any redistribution must be conditioned upon
  21  *    including a substantially similar Disclaimer requirement for further
  22  *    binary redistribution.
  23  * 3. Neither the names of the above-listed copyright holders nor the names
  24  *    of any contributors may be used to endorse or promote products derived
  25  *    from this software without specific prior written permission.
  26  *
  27  * Alternatively, this software may be distributed under the terms of the
  28  * GNU General Public License ("GPL") version 2 as published by the Free
  29  * Software Foundation.
  30  *
  31  * NO WARRANTY
  32  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  33  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  34  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  35  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  36  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  37  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  38  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  39  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  40  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  41  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  42  * POSSIBILITY OF SUCH DAMAGES.
  43  */
  44
  45 #include <acpi/acpi.h>
  46 #include "accommon.h"
  47 #include "acnamesp.h"
  48 #include "acpredef.h"
  49
  50 #define _COMPONENT          ACPI_NAMESPACE
  51 ACPI_MODULE_NAME("nspredef")
  52
  53 /*******************************************************************************
  54  *
  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.
  59  *
  60  * There are several areas that are validated:
  61  *
  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
  65  *      specification.
  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.
  69  *
  70  * For any problems found, a warning message is issued.
  71  *
  72  ******************************************************************************/
  73 /* Local prototypes */
  74 static acpi_status
  75 acpi_ns_check_package(char *pathname,
  76                       union acpi_operand_object **return_object_ptr,
  77                       const union acpi_predefined_info *predefined);
  78
  79 static acpi_status
  80 acpi_ns_check_package_elements(char *pathname,
  81                                union acpi_operand_object **elements,
  82                                u8 type1,
  83                                u32 count1,
  84                                u8 type2, u32 count2, u32 start_index);
  85
  86 static acpi_status
  87 acpi_ns_check_object_type(char *pathname,
  88                           union acpi_operand_object **return_object_ptr,
  89                           u32 expected_btypes, u32 package_index);
  90
  91 static acpi_status
  92 acpi_ns_check_reference(char *pathname,
  93                         union acpi_operand_object *return_object);
  94
  95 static acpi_status
  96 acpi_ns_repair_object(u32 expected_btypes,
  97                       u32 package_index,
  98                       union acpi_operand_object **return_object_ptr);
  99
 100 /*
 101  * Names for the types that can be returned by the predefined objects.
 102  * Used for warning messages. Must be in the same order as the ACPI_RTYPEs
 103  */
 104 static const char *acpi_rtype_names[] = {
 105         "/Integer",
 106         "/String",
 107         "/Buffer",
 108         "/Package",
 109         "/Reference",
 110 };
 111
 112 #define ACPI_NOT_PACKAGE    ACPI_UINT32_MAX
 113
 114 /*******************************************************************************
 115  *
 116  * FUNCTION:    acpi_ns_check_predefined_names
 117  *
 118  * PARAMETERS:  Node            - Namespace node for the method/object
 119  *              return_object_ptr - Pointer to the object returned from the
 120  *                                evaluation of a method or object
 121  *
 122  * RETURN:      Status
 123  *
 124  * DESCRIPTION: Check an ACPI name for a match in the predefined name list.
 125  *
 126  ******************************************************************************/
 127
 128 acpi_status
 129 acpi_ns_check_predefined_names(struct acpi_namespace_node *node,
 130                                u32 user_param_count,
 131                                acpi_status return_status,
 132                                union acpi_operand_object **return_object_ptr)
 133 {
 134         union acpi_operand_object *return_object = *return_object_ptr;
 135         acpi_status status = AE_OK;
 136         const union acpi_predefined_info *predefined;
 137         char *pathname;
 138
 139         /* Match the name for this method/object against the predefined list */
 140
 141         predefined = acpi_ns_check_for_predefined_name(node);
 142
 143         /* Get the full pathname to the object, for use in error messages */
 144
 145         pathname = acpi_ns_get_external_pathname(node);
 146         if (!pathname) {
 147                 return AE_OK;   /* Could not get pathname, ignore */
 148         }
 149
 150         /*
 151          * Check that the parameter count for this method matches the ASL
 152          * definition. For predefined names, ensure that both the caller and
 153          * the method itself are in accordance with the ACPI specification.
 154          */
 155         acpi_ns_check_parameter_count(pathname, node, user_param_count,
 156                                       predefined);
 157
 158         /* If not a predefined name, we cannot validate the return object */
 159
 160         if (!predefined) {
 161                 goto exit;
 162         }
 163
 164         /* If the method failed, we cannot validate the return object */
 165
 166         if ((return_status != AE_OK) && (return_status != AE_CTRL_RETURN_VALUE)) {
 167                 goto exit;
 168         }
 169
 170         /*
 171          * Only validate the return value on the first successful evaluation of
 172          * the method. This ensures that any warnings will only be emitted during
 173          * the very first evaluation of the method/object.
 174          */
 175         if (node->flags & ANOBJ_EVALUATED) {
 176                 goto exit;
 177         }
 178
 179         /* Mark the node as having been successfully evaluated */
 180
 181         node->flags |= ANOBJ_EVALUATED;
 182
 183         /*
 184          * If there is no return value, check if we require a return value for
 185          * this predefined name. Either one return value is expected, or none,
 186          * for both methods and other objects.
 187          *
 188          * Exit now if there is no return object. Warning if one was expected.
 189          */
 190         if (!return_object) {
 191                 if ((predefined->info.expected_btypes) &&
 192                     (!(predefined->info.expected_btypes & ACPI_RTYPE_NONE))) {
 193                         ACPI_ERROR((AE_INFO,
 194                                     "%s: Missing expected return value",
 195                                     pathname));
 196
 197                         status = AE_AML_NO_RETURN_VALUE;
 198                 }
 199                 goto exit;
 200         }
 201
 202         /*
 203          * We have a return value, but if one wasn't expected, just exit, this is
 204          * not a problem
 205          *
 206          * For example, if the "Implicit Return" feature is enabled, methods will
 207          * always return a value
 208          */
 209         if (!predefined->info.expected_btypes) {
 210                 goto exit;
 211         }
 212
 213         /*
 214          * Check that the type of the return object is what is expected for
 215          * this predefined name
 216          */
 217         status = acpi_ns_check_object_type(pathname, return_object_ptr,
 218                                            predefined->info.expected_btypes,
 219                                            ACPI_NOT_PACKAGE);
 220         if (ACPI_FAILURE(status)) {
 221                 goto exit;
 222         }
 223
 224         /* For returned Package objects, check the type of all sub-objects */
 225
 226         if (return_object->common.type == ACPI_TYPE_PACKAGE) {
 227                 status =
 228                     acpi_ns_check_package(pathname, return_object_ptr,
 229                                           predefined);
 230         }
 231
 232       exit:
 233         ACPI_FREE(pathname);
 234         return (status);
 235 }
 236
 237 /*******************************************************************************
 238  *
 239  * FUNCTION:    acpi_ns_check_parameter_count
 240  *
 241  * PARAMETERS:  Pathname        - Full pathname to the node (for error msgs)
 242  *              Node            - Namespace node for the method/object
 243  *              user_param_count - Number of args passed in by the caller
 244  *              Predefined      - Pointer to entry in predefined name table
 245  *
 246  * RETURN:      None
 247  *
 248  * DESCRIPTION: Check that the declared (in ASL/AML) parameter count for a
 249  *              predefined name is what is expected (i.e., what is defined in
 250  *              the ACPI specification for this predefined name.)
 251  *
 252  ******************************************************************************/
 253
 254 void
 255 acpi_ns_check_parameter_count(char *pathname,
 256                               struct acpi_namespace_node *node,
 257                               u32 user_param_count,
 258                               const union acpi_predefined_info *predefined)
 259 {
 260         u32 param_count;
 261         u32 required_params_current;
 262         u32 required_params_old;
 263
 264         /* Methods have 0-7 parameters. All other types have zero. */
 265
 266         param_count = 0;
 267         if (node->type == ACPI_TYPE_METHOD) {
 268                 param_count = node->object->method.param_count;
 269         }
 270
 271         /* Argument count check for non-predefined methods/objects */
 272
 273         if (!predefined) {
 274                 /*
 275                  * Warning if too few or too many arguments have been passed by the
 276                  * caller. An incorrect number of arguments may not cause the method
 277                  * to fail. However, the method will fail if there are too few
 278                  * arguments and the method attempts to use one of the missing ones.
 279                  */
 280                 if (user_param_count < param_count) {
 281                         ACPI_WARNING((AE_INFO,
 282                                       "%s: Insufficient arguments - needs %d, found %d",
 283                                       pathname, param_count, user_param_count));
 284                 } else if (user_param_count > param_count) {
 285                         ACPI_WARNING((AE_INFO,
 286                                       "%s: Excess arguments - needs %d, found %d",
 287                                       pathname, param_count, user_param_count));
 288                 }
 289                 return;
 290         }
 291
 292         /* Allow two different legal argument counts (_SCP, etc.) */
 293
 294         required_params_current = predefined->info.param_count & 0x0F;
 295         required_params_old = predefined->info.param_count >> 4;
 296
 297         if (user_param_count != ACPI_UINT32_MAX) {
 298
 299                 /* Validate the user-supplied parameter count */
 300
 301                 if ((user_param_count != required_params_current) &&
 302                     (user_param_count != required_params_old)) {
 303                         ACPI_WARNING((AE_INFO,
 304                                       "%s: Parameter count mismatch - "
 305                                       "caller passed %d, ACPI requires %d",
 306                                       pathname, user_param_count,
 307                                       required_params_current));
 308                 }
 309         }
 310
 311         /*
 312          * Only validate the argument count on the first successful evaluation of
 313          * the method. This ensures that any warnings will only be emitted during
 314          * the very first evaluation of the method/object.
 315          */
 316         if (node->flags & ANOBJ_EVALUATED) {
 317                 return;
 318         }
 319
 320         /*
 321          * Check that the ASL-defined parameter count is what is expected for
 322          * this predefined name.
 323          */
 324         if ((param_count != required_params_current) &&
 325             (param_count != required_params_old)) {
 326                 ACPI_WARNING((AE_INFO,
 327                               "%s: Parameter count mismatch - ASL declared %d, ACPI requires %d",
 328                               pathname, param_count, required_params_current));
 329         }
 330 }
 331
 332 /*******************************************************************************
 333  *
 334  * FUNCTION:    acpi_ns_check_for_predefined_name
 335  *
 336  * PARAMETERS:  Node            - Namespace node for the method/object
 337  *
 338  * RETURN:      Pointer to entry in predefined table. NULL indicates not found.
 339  *
 340  * DESCRIPTION: Check an object name against the predefined object list.
 341  *
 342  ******************************************************************************/
 343
 344 const union acpi_predefined_info *acpi_ns_check_for_predefined_name(struct
 345                                                                     acpi_namespace_node
 346                                                                     *node)
 347 {
 348         const union acpi_predefined_info *this_name;
 349
 350         /* Quick check for a predefined name, first character must be underscore */
 351
 352         if (node->name.ascii[0] != '_') {
 353                 return (NULL);
 354         }
 355
 356         /* Search info table for a predefined method/object name */
 357
 358         this_name = predefined_names;
 359         while (this_name->info.name[0]) {
 360                 if (ACPI_COMPARE_NAME(node->name.ascii, this_name->info.name)) {
 361
 362                         /* Return pointer to this table entry */
 363
 364                         return (this_name);
 365                 }
 366
 367                 /*
 368                  * Skip next entry in the table if this name returns a Package
 369                  * (next entry contains the package info)
 370                  */
 371                 if (this_name->info.expected_btypes & ACPI_RTYPE_PACKAGE) {
 372                         this_name++;
 373                 }
 374
 375                 this_name++;
 376         }
 377
 378         return (NULL);
 379 }
 380
 381 /*******************************************************************************
 382  *
 383  * FUNCTION:    acpi_ns_check_package
 384  *
 385  * PARAMETERS:  Pathname        - Full pathname to the node (for error msgs)
 386  *              return_object_ptr - Pointer to the object returned from the
 387  *                                evaluation of a method or object
 388  *              Predefined      - Pointer to entry in predefined name table
 389  *
 390  * RETURN:      Status
 391  *
 392  * DESCRIPTION: Check a returned package object for the correct count and
 393  *              correct type of all sub-objects.
 394  *
 395  ******************************************************************************/
 396
 397 static acpi_status
 398 acpi_ns_check_package(char *pathname,
 399                       union acpi_operand_object **return_object_ptr,
 400                       const union acpi_predefined_info *predefined)
 401 {
 402         union acpi_operand_object *return_object = *return_object_ptr;
 403         const union acpi_predefined_info *package;
 404         union acpi_operand_object *sub_package;
 405         union acpi_operand_object **elements;
 406         union acpi_operand_object **sub_elements;
 407         acpi_status status;
 408         u32 expected_count;
 409         u32 count;
 410         u32 i;
 411         u32 j;
 412
 413         ACPI_FUNCTION_NAME(ns_check_package);
 414
 415         /* The package info for this name is in the next table entry */
 416
 417         package = predefined + 1;
 418
 419         ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
 420                           "%s Validating return Package of Type %X, Count %X\n",
 421                           pathname, package->ret_info.type,
 422                           return_object->package.count));
 423
 424         /* Extract package count and elements array */
 425
 426         elements = return_object->package.elements;
 427         count = return_object->package.count;
 428
 429         /* The package must have at least one element, else invalid */
 430
 431         if (!count) {
 432                 ACPI_WARNING((AE_INFO,
 433                               "%s: Return Package has no elements (empty)",
 434                               pathname));
 435
 436                 return (AE_AML_OPERAND_VALUE);
 437         }
 438
 439         /*
 440          * Decode the type of the expected package contents
 441          *
 442          * PTYPE1 packages contain no subpackages
 443          * PTYPE2 packages contain sub-packages
 444          */
 445         switch (package->ret_info.type) {
 446         case ACPI_PTYPE1_FIXED:
 447
 448                 /*
 449                  * The package count is fixed and there are no sub-packages
 450                  *
 451                  * If package is too small, exit.
 452                  * If package is larger than expected, issue warning but continue
 453                  */
 454                 expected_count =
 455                     package->ret_info.count1 + package->ret_info.count2;
 456                 if (count < expected_count) {
 457                         goto package_too_small;
 458                 } else if (count > expected_count) {
 459                         ACPI_WARNING((AE_INFO,
 460                                       "%s: Return Package is larger than needed - "
 461                                       "found %u, expected %u", pathname, count,
 462                                       expected_count));
 463                 }
 464
 465                 /* Validate all elements of the returned package */
 466
 467                 status = acpi_ns_check_package_elements(pathname, elements,
 468                                                         package->ret_info.
 469                                                         object_type1,
 470                                                         package->ret_info.
 471                                                         count1,
 472                                                         package->ret_info.
 473                                                         object_type2,
 474                                                         package->ret_info.
 475                                                         count2, 0);
 476                 if (ACPI_FAILURE(status)) {
 477                         return (status);
 478                 }
 479                 break;
 480
 481         case ACPI_PTYPE1_VAR:
 482
 483                 /*
 484                  * The package count is variable, there are no sub-packages, and all
 485                  * elements must be of the same type
 486                  */
 487                 for (i = 0; i < count; i++) {
 488                         status = acpi_ns_check_object_type(pathname, elements,
 489                                                            package->ret_info.
 490                                                            object_type1, i);
 491                         if (ACPI_FAILURE(status)) {
 492                                 return (status);
 493                         }
 494                         elements++;
 495                 }
 496                 break;
 497
 498         case ACPI_PTYPE1_OPTION:
 499
 500                 /*
 501                  * The package count is variable, there are no sub-packages. There are
 502                  * a fixed number of required elements, and a variable number of
 503                  * optional elements.
 504                  *
 505                  * Check if package is at least as large as the minimum required
 506                  */
 507                 expected_count = package->ret_info3.count;
 508                 if (count < expected_count) {
 509                         goto package_too_small;
 510                 }
 511
 512                 /* Variable number of sub-objects */
 513
 514                 for (i = 0; i < count; i++) {
 515                         if (i < package->ret_info3.count) {
 516
 517                                 /* These are the required package elements (0, 1, or 2) */
 518
 519                                 status =
 520                                     acpi_ns_check_object_type(pathname,
 521                                                               elements,
 522                                                               package->
 523                                                               ret_info3.
 524                                                               object_type[i],
 525                                                               i);
 526                                 if (ACPI_FAILURE(status)) {
 527                                         return (status);
 528                                 }
 529                         } else {
 530                                 /* These are the optional package elements */
 531
 532                                 status =
 533                                     acpi_ns_check_object_type(pathname,
 534                                                               elements,
 535                                                               package->
 536                                                               ret_info3.
 537                                                               tail_object_type,
 538                                                               i);
 539                                 if (ACPI_FAILURE(status)) {
 540                                         return (status);
 541                                 }
 542                         }
 543                         elements++;
 544                 }
 545                 break;
 546
 547         case ACPI_PTYPE2_PKG_COUNT:
 548
 549                 /* First element is the (Integer) count of sub-packages to follow */
 550
 551                 status = acpi_ns_check_object_type(pathname, elements,
 552                                                    ACPI_RTYPE_INTEGER, 0);
 553                 if (ACPI_FAILURE(status)) {
 554                         return (status);
 555                 }
 556
 557                 /*
 558                  * Count cannot be larger than the parent package length, but allow it
 559                  * to be smaller. The >= accounts for the Integer above.
 560                  */
 561                 expected_count = (u32) (*elements)->integer.value;
 562                 if (expected_count >= count) {
 563                         goto package_too_small;
 564                 }
 565
 566                 count = expected_count;
 567                 elements++;
 568
 569                 /* Now we can walk the sub-packages */
 570
 571                 /*lint -fallthrough */
 572
 573         case ACPI_PTYPE2:
 574         case ACPI_PTYPE2_FIXED:
 575         case ACPI_PTYPE2_MIN:
 576         case ACPI_PTYPE2_COUNT:
 577
 578                 /*
 579                  * These types all return a single package that consists of a variable
 580                  * number of sub-packages
 581                  */
 582                 for (i = 0; i < count; i++) {
 583                         sub_package = *elements;
 584                         sub_elements = sub_package->package.elements;
 585
 586                         /* Each sub-object must be of type Package */
 587
 588                         status =
 589                             acpi_ns_check_object_type(pathname, &sub_package,
 590                                                       ACPI_RTYPE_PACKAGE, i);
 591                         if (ACPI_FAILURE(status)) {
 592                                 return (status);
 593                         }
 594
 595                         /* Examine the different types of sub-packages */
 596
 597                         switch (package->ret_info.type) {
 598                         case ACPI_PTYPE2:
 599                         case ACPI_PTYPE2_PKG_COUNT:
 600
 601                                 /* Each subpackage has a fixed number of elements */
 602
 603                                 expected_count =
 604                                     package->ret_info.count1 +
 605                                     package->ret_info.count2;
 606                                 if (sub_package->package.count !=
 607                                     expected_count) {
 608                                         count = sub_package->package.count;
 609                                         goto package_too_small;
 610                                 }
 611
 612                                 status =
 613                                     acpi_ns_check_package_elements(pathname,
 614                                                                    sub_elements,
 615                                                                    package->
 616                                                                    ret_info.
 617                                                                    object_type1,
 618                                                                    package->
 619                                                                    ret_info.
 620                                                                    count1,
 621                                                                    package->
 622                                                                    ret_info.
 623                                                                    object_type2,
 624                                                                    package->
 625                                                                    ret_info.
 626                                                                    count2, 0);
 627                                 if (ACPI_FAILURE(status)) {
 628                                         return (status);
 629                                 }
 630                                 break;
 631
 632                         case ACPI_PTYPE2_FIXED:
 633
 634                                 /* Each sub-package has a fixed length */
 635
 636                                 expected_count = package->ret_info2.count;
 637                                 if (sub_package->package.count < expected_count) {
 638                                         count = sub_package->package.count;
 639                                         goto package_too_small;
 640                                 }
 641
 642                                 /* Check the type of each sub-package element */
 643
 644                                 for (j = 0; j < expected_count; j++) {
 645                                         status =
 646                                             acpi_ns_check_object_type(pathname,
 647                                                 &sub_elements[j],
 648                                                 package->ret_info2.object_type[j], j);
 649                                         if (ACPI_FAILURE(status)) {
 650                                                 return (status);
 651                                         }
 652                                 }
 653                                 break;
 654
 655                         case ACPI_PTYPE2_MIN:
 656
 657                                 /* Each sub-package has a variable but minimum length */
 658
 659                                 expected_count = package->ret_info.count1;
 660                                 if (sub_package->package.count < expected_count) {
 661                                         count = sub_package->package.count;
 662                                         goto package_too_small;
 663                                 }
 664
 665                                 /* Check the type of each sub-package element */
 666
 667                                 status =
 668                                     acpi_ns_check_package_elements(pathname,
 669                                                                    sub_elements,
 670                                                                    package->
 671                                                                    ret_info.
 672                                                                    object_type1,
 673                                                                    sub_package->
 674                                                                    package.
 675                                                                    count, 0, 0,
 676                                                                    0);
 677                                 if (ACPI_FAILURE(status)) {
 678                                         return (status);
 679                                 }
 680                                 break;
 681
 682                         case ACPI_PTYPE2_COUNT:
 683
 684                                 /* First element is the (Integer) count of elements to follow */
 685
 686                                 status =
 687                                     acpi_ns_check_object_type(pathname,
 688                                                               sub_elements,
 689                                                               ACPI_RTYPE_INTEGER,
 690                                                               0);
 691                                 if (ACPI_FAILURE(status)) {
 692                                         return (status);
 693                                 }
 694
 695                                 /* Make sure package is large enough for the Count */
 696
 697                                 expected_count =
 698                                     (u32) (*sub_elements)->integer.value;
 699                                 if (sub_package->package.count < expected_count) {
 700                                         count = sub_package->package.count;
 701                                         goto package_too_small;
 702                                 }
 703
 704                                 /* Check the type of each sub-package element */
 705
 706                                 status =
 707                                     acpi_ns_check_package_elements(pathname,
 708                                                                    (sub_elements
 709                                                                     + 1),
 710                                                                    package->
 711                                                                    ret_info.
 712                                                                    object_type1,
 713                                                                    (expected_count
 714                                                                     - 1), 0, 0,
 715                                                                    1);
 716                                 if (ACPI_FAILURE(status)) {
 717                                         return (status);
 718                                 }
 719                                 break;
 720
 721                         default:
 722                                 break;
 723                         }
 724
 725                         elements++;
 726                 }
 727                 break;
 728
 729         default:
 730
 731                 /* Should not get here if predefined info table is correct */
 732
 733                 ACPI_WARNING((AE_INFO,
 734                               "%s: Invalid internal return type in table entry: %X",
 735                               pathname, package->ret_info.type));
 736
 737                 return (AE_AML_INTERNAL);
 738         }
 739
 740         return (AE_OK);
 741
 742       package_too_small:
 743
 744         /* Error exit for the case with an incorrect package count */
 745
 746         ACPI_WARNING((AE_INFO, "%s: Return Package is too small - "
 747                       "found %u, expected %u", pathname, count,
 748                       expected_count));
 749
 750         return (AE_AML_OPERAND_VALUE);
 751 }
 752
 753 /*******************************************************************************
 754  *
 755  * FUNCTION:    acpi_ns_check_package_elements
 756  *
 757  * PARAMETERS:  Pathname        - Full pathname to the node (for error msgs)
 758  *              Elements        - Pointer to the package elements array
 759  *              Type1           - Object type for first group
 760  *              Count1          - Count for first group
 761  *              Type2           - Object type for second group
 762  *              Count2          - Count for second group
 763  *              start_index     - Start of the first group of elements
 764  *
 765  * RETURN:      Status
 766  *
 767  * DESCRIPTION: Check that all elements of a package are of the correct object
 768  *              type. Supports up to two groups of different object types.
 769  *
 770  ******************************************************************************/
 771
 772 static acpi_status
 773 acpi_ns_check_package_elements(char *pathname,
 774                                union acpi_operand_object **elements,
 775                                u8 type1,
 776                                u32 count1,
 777                                u8 type2, u32 count2, u32 start_index)
 778 {
 779         union acpi_operand_object **this_element = elements;
 780         acpi_status status;
 781         u32 i;
 782
 783         /*
 784          * Up to two groups of package elements are supported by the data
 785          * structure. All elements in each group must be of the same type.
 786          * The second group can have a count of zero.
 787          */
 788         for (i = 0; i < count1; i++) {
 789                 status = acpi_ns_check_object_type(pathname, this_element,
 790                                                    type1, i + start_index);
 791                 if (ACPI_FAILURE(status)) {
 792                         return (status);
 793                 }
 794                 this_element++;
 795         }
 796
 797         for (i = 0; i < count2; i++) {
 798                 status = acpi_ns_check_object_type(pathname, this_element,
 799                                                    type2,
 800                                                    (i + count1 + start_index));
 801                 if (ACPI_FAILURE(status)) {
 802                         return (status);
 803                 }
 804                 this_element++;
 805         }
 806
 807         return (AE_OK);
 808 }
 809
 810 /*******************************************************************************
 811  *
 812  * FUNCTION:    acpi_ns_check_object_type
 813  *
 814  * PARAMETERS:  Pathname        - Full pathname to the node (for error msgs)
 815  *              return_object_ptr - Pointer to the object returned from the
 816  *                                evaluation of a method or object
 817  *              expected_btypes - Bitmap of expected return type(s)
 818  *              package_index   - Index of object within parent package (if
 819  *                                applicable - ACPI_NOT_PACKAGE otherwise)
 820  *
 821  * RETURN:      Status
 822  *
 823  * DESCRIPTION: Check the type of the return object against the expected object
 824  *              type(s). Use of Btype allows multiple expected object types.
 825  *
 826  ******************************************************************************/
 827
 828 static acpi_status
 829 acpi_ns_check_object_type(char *pathname,
 830                           union acpi_operand_object **return_object_ptr,
 831                           u32 expected_btypes, u32 package_index)
 832 {
 833         union acpi_operand_object *return_object = *return_object_ptr;
 834         acpi_status status = AE_OK;
 835         u32 return_btype;
 836         char type_buffer[48];   /* Room for 5 types */
 837         u32 this_rtype;
 838         u32 i;
 839         u32 j;
 840
 841         /*
 842          * If we get a NULL return_object here, it is a NULL package element,
 843          * and this is always an error.
 844          */
 845         if (!return_object) {
 846                 goto type_error_exit;
 847         }
 848
 849         /* A Namespace node should not get here, but make sure */
 850
 851         if (ACPI_GET_DESCRIPTOR_TYPE(return_object) == ACPI_DESC_TYPE_NAMED) {
 852                 ACPI_WARNING((AE_INFO,
 853                               "%s: Invalid return type - Found a Namespace node [%4.4s] type %s",
 854                               pathname, return_object->node.name.ascii,
 855                               acpi_ut_get_type_name(return_object->node.type)));
 856                 return (AE_AML_OPERAND_TYPE);
 857         }
 858
 859         /*
 860          * Convert the object type (ACPI_TYPE_xxx) to a bitmapped object type.
 861          * The bitmapped type allows multiple possible return types.
 862          *
 863          * Note, the cases below must handle all of the possible types returned
 864          * from all of the predefined names (including elements of returned
 865          * packages)
 866          */
 867         switch (return_object->common.type) {
 868         case ACPI_TYPE_INTEGER:
 869                 return_btype = ACPI_RTYPE_INTEGER;
 870                 break;
 871
 872         case ACPI_TYPE_BUFFER:
 873                 return_btype = ACPI_RTYPE_BUFFER;
 874                 break;
 875
 876         case ACPI_TYPE_STRING:
 877                 return_btype = ACPI_RTYPE_STRING;
 878                 break;
 879
 880         case ACPI_TYPE_PACKAGE:
 881                 return_btype = ACPI_RTYPE_PACKAGE;
 882                 break;
 883
 884         case ACPI_TYPE_LOCAL_REFERENCE:
 885                 return_btype = ACPI_RTYPE_REFERENCE;
 886                 break;
 887
 888         default:
 889                 /* Not one of the supported objects, must be incorrect */
 890
 891                 goto type_error_exit;
 892         }
 893
 894         /* Is the object one of the expected types? */
 895
 896         if (!(return_btype & expected_btypes)) {
 897
 898                 /* Type mismatch -- attempt repair of the returned object */
 899
 900                 status = acpi_ns_repair_object(expected_btypes, package_index,
 901                                                return_object_ptr);
 902                 if (ACPI_SUCCESS(status)) {
 903                         return (status);
 904                 }
 905                 goto type_error_exit;
 906         }
 907
 908         /* For reference objects, check that the reference type is correct */
 909
 910         if (return_object->common.type == ACPI_TYPE_LOCAL_REFERENCE) {
 911                 status = acpi_ns_check_reference(pathname, return_object);
 912         }
 913
 914         return (status);
 915
 916       type_error_exit:
 917
 918         /* Create a string with all expected types for this predefined object */
 919
 920         j = 1;
 921         type_buffer[0] = 0;
 922         this_rtype = ACPI_RTYPE_INTEGER;
 923
 924         for (i = 0; i < ACPI_NUM_RTYPES; i++) {
 925
 926                 /* If one of the expected types, concatenate the name of this type */
 927
 928                 if (expected_btypes & this_rtype) {
 929                         ACPI_STRCAT(type_buffer, &acpi_rtype_names[i][j]);
 930                         j = 0;  /* Use name separator from now on */
 931                 }
 932                 this_rtype <<= 1;       /* Next Rtype */
 933         }
 934
 935         if (package_index == ACPI_NOT_PACKAGE) {
 936                 ACPI_WARNING((AE_INFO,
 937                               "%s: Return type mismatch - found %s, expected %s",
 938                               pathname,
 939                               acpi_ut_get_object_type_name(return_object),
 940                               type_buffer));
 941         } else {
 942                 ACPI_WARNING((AE_INFO,
 943                               "%s: Return Package type mismatch at index %u - "
 944                               "found %s, expected %s", pathname, package_index,
 945                               acpi_ut_get_object_type_name(return_object),
 946                               type_buffer));
 947         }
 948
 949         return (AE_AML_OPERAND_TYPE);
 950 }
 951
 952 /*******************************************************************************
 953  *
 954  * FUNCTION:    acpi_ns_check_reference
 955  *
 956  * PARAMETERS:  Pathname        - Full pathname to the node (for error msgs)
 957  *              return_object   - Object returned from the evaluation of a
 958  *                                method or object
 959  *
 960  * RETURN:      Status
 961  *
 962  * DESCRIPTION: Check a returned reference object for the correct reference
 963  *              type. The only reference type that can be returned from a
 964  *              predefined method is a named reference. All others are invalid.
 965  *
 966  ******************************************************************************/
 967
 968 static acpi_status
 969 acpi_ns_check_reference(char *pathname,
 970                         union acpi_operand_object *return_object)
 971 {
 972
 973         /*
 974          * Check the reference object for the correct reference type (opcode).
 975          * The only type of reference that can be converted to an union acpi_object is
 976          * a reference to a named object (reference class: NAME)
 977          */
 978         if (return_object->reference.class == ACPI_REFCLASS_NAME) {
 979                 return (AE_OK);
 980         }
 981
 982         ACPI_WARNING((AE_INFO,
 983                       "%s: Return type mismatch - "
 984                       "unexpected reference object type [%s] %2.2X",
 985                       pathname, acpi_ut_get_reference_name(return_object),
 986                       return_object->reference.class));
 987
 988         return (AE_AML_OPERAND_TYPE);
 989 }
 990
 991 /*******************************************************************************
 992  *
 993  * FUNCTION:    acpi_ns_repair_object
 994  *
 995  * PARAMETERS:  Pathname        - Full pathname to the node (for error msgs)
 996  *              package_index   - Used to determine if target is in a package
 997  *              return_object_ptr - Pointer to the object returned from the
 998  *                                evaluation of a method or object
 999  *
1000  * RETURN:      Status. AE_OK if repair was successful.
1001  *
1002  * DESCRIPTION: Attempt to repair/convert a return object of a type that was
1003  *              not expected.
1004  *
1005  ******************************************************************************/
1006
1007 static acpi_status
1008 acpi_ns_repair_object(u32 expected_btypes,
1009                       u32 package_index,
1010                       union acpi_operand_object **return_object_ptr)
1011 {
1012         union acpi_operand_object *return_object = *return_object_ptr;
1013         union acpi_operand_object *new_object;
1014         acpi_size length;
1015
1016         switch (return_object->common.type) {
1017         case ACPI_TYPE_BUFFER:
1018
1019                 if (!(expected_btypes & ACPI_RTYPE_STRING)) {
1020                         return (AE_AML_OPERAND_TYPE);
1021                 }
1022
1023                 /*
1024                  * Have a Buffer, expected a String, convert. Use a to_string
1025                  * conversion, no transform performed on the buffer data. The best
1026                  * example of this is the _BIF method, where the string data from
1027                  * the battery is often (incorrectly) returned as buffer object(s).
1028                  */
1029                 length = 0;
1030                 while ((length < return_object->buffer.length) &&
1031                        (return_object->buffer.pointer[length])) {
1032                         length++;
1033                 }
1034
1035                 /* Allocate a new string object */
1036
1037                 new_object = acpi_ut_create_string_object(length);
1038                 if (!new_object) {
1039                         return (AE_NO_MEMORY);
1040                 }
1041
1042                 /*
1043                  * Copy the raw buffer data with no transform. String is already NULL
1044                  * terminated at Length+1.
1045                  */
1046                 ACPI_MEMCPY(new_object->string.pointer,
1047                             return_object->buffer.pointer, length);
1048
1049                 /* Install the new return object */
1050
1051                 acpi_ut_remove_reference(return_object);
1052                 *return_object_ptr = new_object;
1053
1054                 /*
1055                  * If the object is a package element, we need to:
1056                  * 1. Decrement the reference count of the orignal object, it was
1057                  *    incremented when building the package
1058                  * 2. Increment the reference count of the new object, it will be
1059                  *    decremented when releasing the package
1060                  */
1061                 if (package_index != ACPI_NOT_PACKAGE) {
1062                         acpi_ut_remove_reference(return_object);
1063                         acpi_ut_add_reference(new_object);
1064                 }
1065                 return (AE_OK);
1066
1067         default:
1068                 break;
1069         }
1070
1071         return (AE_AML_OPERAND_TYPE);
1072 }