drivers/acpi/acpica/nsprepkg.c

   1 /******************************************************************************
   2  *
   3  * Module Name: nsprepkg - Validation of package objects for predefined names
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2018, 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 #include <acpi/acpi.h>
  45 #include "accommon.h"
  46 #include "acnamesp.h"
  47 #include "acpredef.h"
  48
  49 #define _COMPONENT          ACPI_NAMESPACE
  50 ACPI_MODULE_NAME("nsprepkg")
  51
  52 /* Local prototypes */
  53 static acpi_status
  54 acpi_ns_check_package_list(struct acpi_evaluate_info *info,
  55                            const union acpi_predefined_info *package,
  56                            union acpi_operand_object **elements, u32 count);
  57
  58 static acpi_status
  59 acpi_ns_check_package_elements(struct acpi_evaluate_info *info,
  60                                union acpi_operand_object **elements,
  61                                u8 type1,
  62                                u32 count1,
  63                                u8 type2, u32 count2, u32 start_index);
  64
  65 static acpi_status
  66 acpi_ns_custom_package(struct acpi_evaluate_info *info,
  67                        union acpi_operand_object **elements, u32 count);
  68
  69 /*******************************************************************************
  70  *
  71  * FUNCTION:    acpi_ns_check_package
  72  *
  73  * PARAMETERS:  info                - Method execution information block
  74  *              return_object_ptr   - Pointer to the object returned from the
  75  *                                    evaluation of a method or object
  76  *
  77  * RETURN:      Status
  78  *
  79  * DESCRIPTION: Check a returned package object for the correct count and
  80  *              correct type of all sub-objects.
  81  *
  82  ******************************************************************************/
  83
  84 acpi_status
  85 acpi_ns_check_package(struct acpi_evaluate_info *info,
  86                       union acpi_operand_object **return_object_ptr)
  87 {
  88         union acpi_operand_object *return_object = *return_object_ptr;
  89         const union acpi_predefined_info *package;
  90         union acpi_operand_object **elements;
  91         acpi_status status = AE_OK;
  92         u32 expected_count;
  93         u32 count;
  94         u32 i;
  95
  96         ACPI_FUNCTION_NAME(ns_check_package);
  97
  98         /* The package info for this name is in the next table entry */
  99
 100         package = info->predefined + 1;
 101
 102         ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
 103                           "%s Validating return Package of Type %X, Count %X\n",
 104                           info->full_pathname, package->ret_info.type,
 105                           return_object->package.count));
 106
 107         /*
 108          * For variable-length Packages, we can safely remove all embedded
 109          * and trailing NULL package elements
 110          */
 111         acpi_ns_remove_null_elements(info, package->ret_info.type,
 112                                      return_object);
 113
 114         /* Extract package count and elements array */
 115
 116         elements = return_object->package.elements;
 117         count = return_object->package.count;
 118
 119         /*
 120          * Most packages must have at least one element. The only exception
 121          * is the variable-length package (ACPI_PTYPE1_VAR).
 122          */
 123         if (!count) {
 124                 if (package->ret_info.type == ACPI_PTYPE1_VAR) {
 125                         return (AE_OK);
 126                 }
 127
 128                 ACPI_WARN_PREDEFINED((AE_INFO, info->full_pathname,
 129                                       info->node_flags,
 130                                       "Return Package has no elements (empty)"));
 131
 132                 return (AE_AML_OPERAND_VALUE);
 133         }
 134
 135         /*
 136          * Decode the type of the expected package contents
 137          *
 138          * PTYPE1 packages contain no subpackages
 139          * PTYPE2 packages contain subpackages
 140          */
 141         switch (package->ret_info.type) {
 142         case ACPI_PTYPE_CUSTOM:
 143
 144                 status = acpi_ns_custom_package(info, elements, count);
 145                 break;
 146
 147         case ACPI_PTYPE1_FIXED:
 148                 /*
 149                  * The package count is fixed and there are no subpackages
 150                  *
 151                  * If package is too small, exit.
 152                  * If package is larger than expected, issue warning but continue
 153                  */
 154                 expected_count =
 155                     package->ret_info.count1 + package->ret_info.count2;
 156                 if (count < expected_count) {
 157                         goto package_too_small;
 158                 } else if (count > expected_count) {
 159                         ACPI_DEBUG_PRINT((ACPI_DB_REPAIR,
 160                                           "%s: Return Package is larger than needed - "
 161                                           "found %u, expected %u\n",
 162                                           info->full_pathname, count,
 163                                           expected_count));
 164                 }
 165
 166                 /* Validate all elements of the returned package */
 167
 168                 status = acpi_ns_check_package_elements(info, elements,
 169                                                         package->ret_info.
 170                                                         object_type1,
 171                                                         package->ret_info.
 172                                                         count1,
 173                                                         package->ret_info.
 174                                                         object_type2,
 175                                                         package->ret_info.
 176                                                         count2, 0);
 177                 break;
 178
 179         case ACPI_PTYPE1_VAR:
 180                 /*
 181                  * The package count is variable, there are no subpackages, and all
 182                  * elements must be of the same type
 183                  */
 184                 for (i = 0; i < count; i++) {
 185                         status = acpi_ns_check_object_type(info, elements,
 186                                                            package->ret_info.
 187                                                            object_type1, i);
 188                         if (ACPI_FAILURE(status)) {
 189                                 return (status);
 190                         }
 191
 192                         elements++;
 193                 }
 194                 break;
 195
 196         case ACPI_PTYPE1_OPTION:
 197                 /*
 198                  * The package count is variable, there are no subpackages. There are
 199                  * a fixed number of required elements, and a variable number of
 200                  * optional elements.
 201                  *
 202                  * Check if package is at least as large as the minimum required
 203                  */
 204                 expected_count = package->ret_info3.count;
 205                 if (count < expected_count) {
 206                         goto package_too_small;
 207                 }
 208
 209                 /* Variable number of sub-objects */
 210
 211                 for (i = 0; i < count; i++) {
 212                         if (i < package->ret_info3.count) {
 213
 214                                 /* These are the required package elements (0, 1, or 2) */
 215
 216                                 status =
 217                                     acpi_ns_check_object_type(info, elements,
 218                                                               package->
 219                                                               ret_info3.
 220                                                               object_type[i],
 221                                                               i);
 222                                 if (ACPI_FAILURE(status)) {
 223                                         return (status);
 224                                 }
 225                         } else {
 226                                 /* These are the optional package elements */
 227
 228                                 status =
 229                                     acpi_ns_check_object_type(info, elements,
 230                                                               package->
 231                                                               ret_info3.
 232                                                               tail_object_type,
 233                                                               i);
 234                                 if (ACPI_FAILURE(status)) {
 235                                         return (status);
 236                                 }
 237                         }
 238
 239                         elements++;
 240                 }
 241                 break;
 242
 243         case ACPI_PTYPE2_REV_FIXED:
 244
 245                 /* First element is the (Integer) revision */
 246
 247                 status =
 248                     acpi_ns_check_object_type(info, elements,
 249                                               ACPI_RTYPE_INTEGER, 0);
 250                 if (ACPI_FAILURE(status)) {
 251                         return (status);
 252                 }
 253
 254                 elements++;
 255                 count--;
 256
 257                 /* Examine the subpackages */
 258
 259                 status =
 260                     acpi_ns_check_package_list(info, package, elements, count);
 261                 break;
 262
 263         case ACPI_PTYPE2_PKG_COUNT:
 264
 265                 /* First element is the (Integer) count of subpackages to follow */
 266
 267                 status =
 268                     acpi_ns_check_object_type(info, elements,
 269                                               ACPI_RTYPE_INTEGER, 0);
 270                 if (ACPI_FAILURE(status)) {
 271                         return (status);
 272                 }
 273
 274                 /*
 275                  * Count cannot be larger than the parent package length, but allow it
 276                  * to be smaller. The >= accounts for the Integer above.
 277                  */
 278                 expected_count = (u32)(*elements)->integer.value;
 279                 if (expected_count >= count) {
 280                         goto package_too_small;
 281                 }
 282
 283                 count = expected_count;
 284                 elements++;
 285
 286                 /* Examine the subpackages */
 287
 288                 status =
 289                     acpi_ns_check_package_list(info, package, elements, count);
 290                 break;
 291
 292         case ACPI_PTYPE2:
 293         case ACPI_PTYPE2_FIXED:
 294         case ACPI_PTYPE2_MIN:
 295         case ACPI_PTYPE2_COUNT:
 296         case ACPI_PTYPE2_FIX_VAR:
 297                 /*
 298                  * These types all return a single Package that consists of a
 299                  * variable number of subpackages.
 300                  *
 301                  * First, ensure that the first element is a subpackage. If not,
 302                  * the BIOS may have incorrectly returned the object as a single
 303                  * package instead of a Package of Packages (a common error if
 304                  * there is only one entry). We may be able to repair this by
 305                  * wrapping the returned Package with a new outer Package.
 306                  */
 307                 if (*elements
 308                     && ((*elements)->common.type != ACPI_TYPE_PACKAGE)) {
 309
 310                         /* Create the new outer package and populate it */
 311
 312                         status =
 313                             acpi_ns_wrap_with_package(info, return_object,
 314                                                       return_object_ptr);
 315                         if (ACPI_FAILURE(status)) {
 316                                 return (status);
 317                         }
 318
 319                         /* Update locals to point to the new package (of 1 element) */
 320
 321                         return_object = *return_object_ptr;
 322                         elements = return_object->package.elements;
 323                         count = 1;
 324                 }
 325
 326                 /* Examine the subpackages */
 327
 328                 status =
 329                     acpi_ns_check_package_list(info, package, elements, count);
 330                 break;
 331
 332         case ACPI_PTYPE2_VAR_VAR:
 333                 /*
 334                  * Returns a variable list of packages, each with a variable list
 335                  * of objects.
 336                  */
 337                 break;
 338
 339         case ACPI_PTYPE2_UUID_PAIR:
 340
 341                 /* The package must contain pairs of (UUID + type) */
 342
 343                 if (count & 1) {
 344                         expected_count = count + 1;
 345                         goto package_too_small;
 346                 }
 347
 348                 while (count > 0) {
 349                         status = acpi_ns_check_object_type(info, elements,
 350                                                            package->ret_info.
 351                                                            object_type1, 0);
 352                         if (ACPI_FAILURE(status)) {
 353                                 return (status);
 354                         }
 355
 356                         /* Validate length of the UUID buffer */
 357
 358                         if ((*elements)->buffer.length != 16) {
 359                                 ACPI_WARN_PREDEFINED((AE_INFO,
 360                                                       info->full_pathname,
 361                                                       info->node_flags,
 362                                                       "Invalid length for UUID Buffer"));
 363                                 return (AE_AML_OPERAND_VALUE);
 364                         }
 365
 366                         status = acpi_ns_check_object_type(info, elements + 1,
 367                                                            package->ret_info.
 368                                                            object_type2, 0);
 369                         if (ACPI_FAILURE(status)) {
 370                                 return (status);
 371                         }
 372
 373                         elements += 2;
 374                         count -= 2;
 375                 }
 376                 break;
 377
 378         default:
 379
 380                 /* Should not get here if predefined info table is correct */
 381
 382                 ACPI_WARN_PREDEFINED((AE_INFO, info->full_pathname,
 383                                       info->node_flags,
 384                                       "Invalid internal return type in table entry: %X",
 385                                       package->ret_info.type));
 386
 387                 return (AE_AML_INTERNAL);
 388         }
 389
 390         return (status);
 391
 392 package_too_small:
 393
 394         /* Error exit for the case with an incorrect package count */
 395
 396         ACPI_WARN_PREDEFINED((AE_INFO, info->full_pathname, info->node_flags,
 397                               "Return Package is too small - found %u elements, expected %u",
 398                               count, expected_count));
 399
 400         return (AE_AML_OPERAND_VALUE);
 401 }
 402
 403 /*******************************************************************************
 404  *
 405  * FUNCTION:    acpi_ns_check_package_list
 406  *
 407  * PARAMETERS:  info            - Method execution information block
 408  *              package         - Pointer to package-specific info for method
 409  *              elements        - Element list of parent package. All elements
 410  *                                of this list should be of type Package.
 411  *              count           - Count of subpackages
 412  *
 413  * RETURN:      Status
 414  *
 415  * DESCRIPTION: Examine a list of subpackages
 416  *
 417  ******************************************************************************/
 418
 419 static acpi_status
 420 acpi_ns_check_package_list(struct acpi_evaluate_info *info,
 421                            const union acpi_predefined_info *package,
 422                            union acpi_operand_object **elements, u32 count)
 423 {
 424         union acpi_operand_object *sub_package;
 425         union acpi_operand_object **sub_elements;
 426         acpi_status status;
 427         u32 expected_count;
 428         u32 i;
 429         u32 j;
 430
 431         /*
 432          * Validate each subpackage in the parent Package
 433          *
 434          * NOTE: assumes list of subpackages contains no NULL elements.
 435          * Any NULL elements should have been removed by earlier call
 436          * to acpi_ns_remove_null_elements.
 437          */
 438         for (i = 0; i < count; i++) {
 439                 sub_package = *elements;
 440                 sub_elements = sub_package->package.elements;
 441                 info->parent_package = sub_package;
 442
 443                 /* Each sub-object must be of type Package */
 444
 445                 status = acpi_ns_check_object_type(info, &sub_package,
 446                                                    ACPI_RTYPE_PACKAGE, i);
 447                 if (ACPI_FAILURE(status)) {
 448                         return (status);
 449                 }
 450
 451                 /* Examine the different types of expected subpackages */
 452
 453                 info->parent_package = sub_package;
 454                 switch (package->ret_info.type) {
 455                 case ACPI_PTYPE2:
 456                 case ACPI_PTYPE2_PKG_COUNT:
 457                 case ACPI_PTYPE2_REV_FIXED:
 458
 459                         /* Each subpackage has a fixed number of elements */
 460
 461                         expected_count =
 462                             package->ret_info.count1 + package->ret_info.count2;
 463                         if (sub_package->package.count < expected_count) {
 464                                 goto package_too_small;
 465                         }
 466
 467                         status =
 468                             acpi_ns_check_package_elements(info, sub_elements,
 469                                                            package->ret_info.
 470                                                            object_type1,
 471                                                            package->ret_info.
 472                                                            count1,
 473                                                            package->ret_info.
 474                                                            object_type2,
 475                                                            package->ret_info.
 476                                                            count2, 0);
 477                         if (ACPI_FAILURE(status)) {
 478                                 return (status);
 479                         }
 480                         break;
 481
 482                 case ACPI_PTYPE2_FIX_VAR:
 483                         /*
 484                          * Each subpackage has a fixed number of elements and an
 485                          * optional element
 486                          */
 487                         expected_count =
 488                             package->ret_info.count1 + package->ret_info.count2;
 489                         if (sub_package->package.count < expected_count) {
 490                                 goto package_too_small;
 491                         }
 492
 493                         status =
 494                             acpi_ns_check_package_elements(info, sub_elements,
 495                                                            package->ret_info.
 496                                                            object_type1,
 497                                                            package->ret_info.
 498                                                            count1,
 499                                                            package->ret_info.
 500                                                            object_type2,
 501                                                            sub_package->package.
 502                                                            count -
 503                                                            package->ret_info.
 504                                                            count1, 0);
 505                         if (ACPI_FAILURE(status)) {
 506                                 return (status);
 507                         }
 508                         break;
 509
 510                 case ACPI_PTYPE2_VAR_VAR:
 511                         /*
 512                          * Each subpackage has a fixed or variable number of elements
 513                          */
 514                         break;
 515
 516                 case ACPI_PTYPE2_FIXED:
 517
 518                         /* Each subpackage has a fixed length */
 519
 520                         expected_count = package->ret_info2.count;
 521                         if (sub_package->package.count < expected_count) {
 522                                 goto package_too_small;
 523                         }
 524
 525                         /* Check the type of each subpackage element */
 526
 527                         for (j = 0; j < expected_count; j++) {
 528                                 status =
 529                                     acpi_ns_check_object_type(info,
 530                                                               &sub_elements[j],
 531                                                               package->
 532                                                               ret_info2.
 533                                                               object_type[j],
 534                                                               j);
 535                                 if (ACPI_FAILURE(status)) {
 536                                         return (status);
 537                                 }
 538                         }
 539                         break;
 540
 541                 case ACPI_PTYPE2_MIN:
 542
 543                         /* Each subpackage has a variable but minimum length */
 544
 545                         expected_count = package->ret_info.count1;
 546                         if (sub_package->package.count < expected_count) {
 547                                 goto package_too_small;
 548                         }
 549
 550                         /* Check the type of each subpackage element */
 551
 552                         status =
 553                             acpi_ns_check_package_elements(info, sub_elements,
 554                                                            package->ret_info.
 555                                                            object_type1,
 556                                                            sub_package->package.
 557                                                            count, 0, 0, 0);
 558                         if (ACPI_FAILURE(status)) {
 559                                 return (status);
 560                         }
 561                         break;
 562
 563                 case ACPI_PTYPE2_COUNT:
 564                         /*
 565                          * First element is the (Integer) count of elements, including
 566                          * the count field (the ACPI name is num_elements)
 567                          */
 568                         status = acpi_ns_check_object_type(info, sub_elements,
 569                                                            ACPI_RTYPE_INTEGER,
 570                                                            0);
 571                         if (ACPI_FAILURE(status)) {
 572                                 return (status);
 573                         }
 574
 575                         /*
 576                          * Make sure package is large enough for the Count and is
 577                          * is as large as the minimum size
 578                          */
 579                         expected_count = (u32)(*sub_elements)->integer.value;
 580                         if (sub_package->package.count < expected_count) {
 581                                 goto package_too_small;
 582                         }
 583
 584                         if (sub_package->package.count <
 585                             package->ret_info.count1) {
 586                                 expected_count = package->ret_info.count1;
 587                                 goto package_too_small;
 588                         }
 589
 590                         if (expected_count == 0) {
 591                                 /*
 592                                  * Either the num_entries element was originally zero or it was
 593                                  * a NULL element and repaired to an Integer of value zero.
 594                                  * In either case, repair it by setting num_entries to be the
 595                                  * actual size of the subpackage.
 596                                  */
 597                                 expected_count = sub_package->package.count;
 598                                 (*sub_elements)->integer.value = expected_count;
 599                         }
 600
 601                         /* Check the type of each subpackage element */
 602
 603                         status =
 604                             acpi_ns_check_package_elements(info,
 605                                                            (sub_elements + 1),
 606                                                            package->ret_info.
 607                                                            object_type1,
 608                                                            (expected_count - 1),
 609                                                            0, 0, 1);
 610                         if (ACPI_FAILURE(status)) {
 611                                 return (status);
 612                         }
 613                         break;
 614
 615                 default:        /* Should not get here, type was validated by caller */
 616
 617                         ACPI_ERROR((AE_INFO, "Invalid Package type: %X",
 618                                     package->ret_info.type));
 619                         return (AE_AML_INTERNAL);
 620                 }
 621
 622                 elements++;
 623         }
 624
 625         return (AE_OK);
 626
 627 package_too_small:
 628
 629         /* The subpackage count was smaller than required */
 630
 631         ACPI_WARN_PREDEFINED((AE_INFO, info->full_pathname, info->node_flags,
 632                               "Return SubPackage[%u] is too small - found %u elements, expected %u",
 633                               i, sub_package->package.count, expected_count));
 634
 635         return (AE_AML_OPERAND_VALUE);
 636 }
 637
 638 /*******************************************************************************
 639  *
 640  * FUNCTION:    acpi_ns_custom_package
 641  *
 642  * PARAMETERS:  info                - Method execution information block
 643  *              elements            - Pointer to the package elements array
 644  *              count               - Element count for the package
 645  *
 646  * RETURN:      Status
 647  *
 648  * DESCRIPTION: Check a returned package object for the correct count and
 649  *              correct type of all sub-objects.
 650  *
 651  * NOTE: Currently used for the _BIX method only. When needed for two or more
 652  * methods, probably a detect/dispatch mechanism will be required.
 653  *
 654  ******************************************************************************/
 655
 656 static acpi_status
 657 acpi_ns_custom_package(struct acpi_evaluate_info *info,
 658                        union acpi_operand_object **elements, u32 count)
 659 {
 660         u32 expected_count;
 661         u32 version;
 662         acpi_status status = AE_OK;
 663
 664         ACPI_FUNCTION_NAME(ns_custom_package);
 665
 666         /* Get version number, must be Integer */
 667
 668         if ((*elements)->common.type != ACPI_TYPE_INTEGER) {
 669                 ACPI_WARN_PREDEFINED((AE_INFO, info->full_pathname,
 670                                       info->node_flags,
 671                                       "Return Package has invalid object type for version number"));
 672                 return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 673         }
 674
 675         version = (u32)(*elements)->integer.value;
 676         expected_count = 21;    /* Version 1 */
 677
 678         if (version == 0) {
 679                 expected_count = 20;    /* Version 0 */
 680         }
 681
 682         if (count < expected_count) {
 683                 ACPI_WARN_PREDEFINED((AE_INFO, info->full_pathname,
 684                                       info->node_flags,
 685                                       "Return Package is too small - found %u elements, expected %u",
 686                                       count, expected_count));
 687                 return_ACPI_STATUS(AE_AML_OPERAND_VALUE);
 688         } else if (count > expected_count) {
 689                 ACPI_DEBUG_PRINT((ACPI_DB_REPAIR,
 690                                   "%s: Return Package is larger than needed - "
 691                                   "found %u, expected %u\n",
 692                                   info->full_pathname, count, expected_count));
 693         }
 694
 695         /* Validate all elements of the returned package */
 696
 697         status = acpi_ns_check_package_elements(info, elements,
 698                                                 ACPI_RTYPE_INTEGER, 16,
 699                                                 ACPI_RTYPE_STRING, 4, 0);
 700         if (ACPI_FAILURE(status)) {
 701                 return_ACPI_STATUS(status);
 702         }
 703
 704         /* Version 1 has a single trailing integer */
 705
 706         if (version > 0) {
 707                 status = acpi_ns_check_package_elements(info, elements + 20,
 708                                                         ACPI_RTYPE_INTEGER, 1,
 709                                                         0, 0, 20);
 710         }
 711
 712         return_ACPI_STATUS(status);
 713 }
 714
 715 /*******************************************************************************
 716  *
 717  * FUNCTION:    acpi_ns_check_package_elements
 718  *
 719  * PARAMETERS:  info            - Method execution information block
 720  *              elements        - Pointer to the package elements array
 721  *              type1           - Object type for first group
 722  *              count1          - Count for first group
 723  *              type2           - Object type for second group
 724  *              count2          - Count for second group
 725  *              start_index     - Start of the first group of elements
 726  *
 727  * RETURN:      Status
 728  *
 729  * DESCRIPTION: Check that all elements of a package are of the correct object
 730  *              type. Supports up to two groups of different object types.
 731  *
 732  ******************************************************************************/
 733
 734 static acpi_status
 735 acpi_ns_check_package_elements(struct acpi_evaluate_info *info,
 736                                union acpi_operand_object **elements,
 737                                u8 type1,
 738                                u32 count1,
 739                                u8 type2, u32 count2, u32 start_index)
 740 {
 741         union acpi_operand_object **this_element = elements;
 742         acpi_status status;
 743         u32 i;
 744
 745         /*
 746          * Up to two groups of package elements are supported by the data
 747          * structure. All elements in each group must be of the same type.
 748          * The second group can have a count of zero.
 749          */
 750         for (i = 0; i < count1; i++) {
 751                 status = acpi_ns_check_object_type(info, this_element,
 752                                                    type1, i + start_index);
 753                 if (ACPI_FAILURE(status)) {
 754                         return (status);
 755                 }
 756
 757                 this_element++;
 758         }
 759
 760         for (i = 0; i < count2; i++) {
 761                 status = acpi_ns_check_object_type(info, this_element,
 762                                                    type2,
 763                                                    (i + count1 + start_index));
 764                 if (ACPI_FAILURE(status)) {
 765                         return (status);
 766                 }
 767
 768                 this_element++;
 769         }
 770
 771         return (AE_OK);
 772 }