drivers/acpi/acpica/uteval.c

   1 /******************************************************************************
   2  *
   3  * Module Name: uteval - Object evaluation
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2008, 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 "acinterp.h"
  48
  49 #define _COMPONENT          ACPI_UTILITIES
  50 ACPI_MODULE_NAME("uteval")
  51
  52 /* Local prototypes */
  53 static void
  54 acpi_ut_copy_id_string(char *destination, char *source, acpi_size max_length);
  55
  56 static acpi_status
  57 acpi_ut_translate_one_cid(union acpi_operand_object *obj_desc,
  58                           struct acpi_compatible_id *one_cid);
  59
  60 /*
  61  * Strings supported by the _OSI predefined (internal) method.
  62  */
  63 static char *acpi_interfaces_supported[] = {
  64         /* Operating System Vendor Strings */
  65
  66         "Windows 2000",         /* Windows 2000 */
  67         "Windows 2001",         /* Windows XP */
  68         "Windows 2001 SP1",     /* Windows XP SP1 */
  69         "Windows 2001 SP2",     /* Windows XP SP2 */
  70         "Windows 2001.1",       /* Windows Server 2003 */
  71         "Windows 2001.1 SP1",   /* Windows Server 2003 SP1 - Added 03/2006 */
  72         "Windows 2006",         /* Windows Vista - Added 03/2006 */
  73
  74         /* Feature Group Strings */
  75
  76         "Extended Address Space Descriptor"
  77             /*
  78              * All "optional" feature group strings (features that are implemented
  79              * by the host) should be implemented in the host version of
  80              * acpi_os_validate_interface and should not be added here.
  81              */
  82 };
  83
  84 /*******************************************************************************
  85  *
  86  * FUNCTION:    acpi_ut_osi_implementation
  87  *
  88  * PARAMETERS:  walk_state          - Current walk state
  89  *
  90  * RETURN:      Status
  91  *
  92  * DESCRIPTION: Implementation of the _OSI predefined control method
  93  *
  94  ******************************************************************************/
  95
  96 acpi_status acpi_ut_osi_implementation(struct acpi_walk_state *walk_state)
  97 {
  98         acpi_status status;
  99         union acpi_operand_object *string_desc;
 100         union acpi_operand_object *return_desc;
 101         u32 i;
 102
 103         ACPI_FUNCTION_TRACE(ut_osi_implementation);
 104
 105         /* Validate the string input argument */
 106
 107         string_desc = walk_state->arguments[0].object;
 108         if (!string_desc || (string_desc->common.type != ACPI_TYPE_STRING)) {
 109                 return_ACPI_STATUS(AE_TYPE);
 110         }
 111
 112         /* Create a return object */
 113
 114         return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
 115         if (!return_desc) {
 116                 return_ACPI_STATUS(AE_NO_MEMORY);
 117         }
 118
 119         /* Default return value is 0, NOT-SUPPORTED */
 120
 121         return_desc->integer.value = 0;
 122         walk_state->return_desc = return_desc;
 123
 124         /* Compare input string to static table of supported interfaces */
 125
 126         for (i = 0; i < ACPI_ARRAY_LENGTH(acpi_interfaces_supported); i++) {
 127                 if (!ACPI_STRCMP
 128                     (string_desc->string.pointer,
 129                      acpi_interfaces_supported[i])) {
 130                         return_desc->integer.value = ACPI_UINT32_MAX;
 131                         goto done;
 132                 }
 133         }
 134
 135         /*
 136          * Did not match the string in the static table, call the host OSL to
 137          * check for a match with one of the optional strings (such as
 138          * "Module Device", "3.0 Thermal Model", etc.)
 139          */
 140         status = acpi_os_validate_interface(string_desc->string.pointer);
 141         if (ACPI_SUCCESS(status)) {
 142                 return_desc->integer.value = ACPI_UINT32_MAX;
 143         }
 144
 145 done:
 146         ACPI_DEBUG_PRINT_RAW((ACPI_DB_INFO, "ACPI: BIOS _OSI(%s) %ssupported\n",
 147                 string_desc->string.pointer,
 148                 return_desc->integer.value == 0 ? "not-" : ""));
 149
 150         return_ACPI_STATUS(AE_OK);
 151 }
 152
 153 /*******************************************************************************
 154  *
 155  * FUNCTION:    acpi_osi_invalidate
 156  *
 157  * PARAMETERS:  interface_string
 158  *
 159  * RETURN:      Status
 160  *
 161  * DESCRIPTION: invalidate string in pre-defiend _OSI string list
 162  *
 163  ******************************************************************************/
 164
 165 acpi_status acpi_osi_invalidate(char *interface)
 166 {
 167         int i;
 168
 169         for (i = 0; i < ACPI_ARRAY_LENGTH(acpi_interfaces_supported); i++) {
 170                 if (!ACPI_STRCMP(interface, acpi_interfaces_supported[i])) {
 171                         *acpi_interfaces_supported[i] = '\0';
 172                         return AE_OK;
 173                 }
 174         }
 175         return AE_NOT_FOUND;
 176 }
 177
 178 /*******************************************************************************
 179  *
 180  * FUNCTION:    acpi_ut_evaluate_object
 181  *
 182  * PARAMETERS:  prefix_node         - Starting node
 183  *              Path                - Path to object from starting node
 184  *              expected_return_types - Bitmap of allowed return types
 185  *              return_desc         - Where a return value is stored
 186  *
 187  * RETURN:      Status
 188  *
 189  * DESCRIPTION: Evaluates a namespace object and verifies the type of the
 190  *              return object.  Common code that simplifies accessing objects
 191  *              that have required return objects of fixed types.
 192  *
 193  *              NOTE: Internal function, no parameter validation
 194  *
 195  ******************************************************************************/
 196
 197 acpi_status
 198 acpi_ut_evaluate_object(struct acpi_namespace_node *prefix_node,
 199                         char *path,
 200                         u32 expected_return_btypes,
 201                         union acpi_operand_object **return_desc)
 202 {
 203         struct acpi_evaluate_info *info;
 204         acpi_status status;
 205         u32 return_btype;
 206
 207         ACPI_FUNCTION_TRACE(ut_evaluate_object);
 208
 209         /* Allocate the evaluation information block */
 210
 211         info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info));
 212         if (!info) {
 213                 return_ACPI_STATUS(AE_NO_MEMORY);
 214         }
 215
 216         info->prefix_node = prefix_node;
 217         info->pathname = path;
 218
 219         /* Evaluate the object/method */
 220
 221         status = acpi_ns_evaluate(info);
 222         if (ACPI_FAILURE(status)) {
 223                 if (status == AE_NOT_FOUND) {
 224                         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 225                                           "[%4.4s.%s] was not found\n",
 226                                           acpi_ut_get_node_name(prefix_node),
 227                                           path));
 228                 } else {
 229                         ACPI_ERROR_METHOD("Method execution failed",
 230                                           prefix_node, path, status);
 231                 }
 232
 233                 goto cleanup;
 234         }
 235
 236         /* Did we get a return object? */
 237
 238         if (!info->return_object) {
 239                 if (expected_return_btypes) {
 240                         ACPI_ERROR_METHOD("No object was returned from",
 241                                           prefix_node, path, AE_NOT_EXIST);
 242
 243                         status = AE_NOT_EXIST;
 244                 }
 245
 246                 goto cleanup;
 247         }
 248
 249         /* Map the return object type to the bitmapped type */
 250
 251         switch (ACPI_GET_OBJECT_TYPE(info->return_object)) {
 252         case ACPI_TYPE_INTEGER:
 253                 return_btype = ACPI_BTYPE_INTEGER;
 254                 break;
 255
 256         case ACPI_TYPE_BUFFER:
 257                 return_btype = ACPI_BTYPE_BUFFER;
 258                 break;
 259
 260         case ACPI_TYPE_STRING:
 261                 return_btype = ACPI_BTYPE_STRING;
 262                 break;
 263
 264         case ACPI_TYPE_PACKAGE:
 265                 return_btype = ACPI_BTYPE_PACKAGE;
 266                 break;
 267
 268         default:
 269                 return_btype = 0;
 270                 break;
 271         }
 272
 273         if ((acpi_gbl_enable_interpreter_slack) && (!expected_return_btypes)) {
 274                 /*
 275                  * We received a return object, but one was not expected.  This can
 276                  * happen frequently if the "implicit return" feature is enabled.
 277                  * Just delete the return object and return AE_OK.
 278                  */
 279                 acpi_ut_remove_reference(info->return_object);
 280                 goto cleanup;
 281         }
 282
 283         /* Is the return object one of the expected types? */
 284
 285         if (!(expected_return_btypes & return_btype)) {
 286                 ACPI_ERROR_METHOD("Return object type is incorrect",
 287                                   prefix_node, path, AE_TYPE);
 288
 289                 ACPI_ERROR((AE_INFO,
 290                             "Type returned from %s was incorrect: %s, expected Btypes: %X",
 291                             path,
 292                             acpi_ut_get_object_type_name(info->return_object),
 293                             expected_return_btypes));
 294
 295                 /* On error exit, we must delete the return object */
 296
 297                 acpi_ut_remove_reference(info->return_object);
 298                 status = AE_TYPE;
 299                 goto cleanup;
 300         }
 301
 302         /* Object type is OK, return it */
 303
 304         *return_desc = info->return_object;
 305
 306       cleanup:
 307         ACPI_FREE(info);
 308         return_ACPI_STATUS(status);
 309 }
 310
 311 /*******************************************************************************
 312  *
 313  * FUNCTION:    acpi_ut_evaluate_numeric_object
 314  *
 315  * PARAMETERS:  object_name         - Object name to be evaluated
 316  *              device_node         - Node for the device
 317  *              Address             - Where the value is returned
 318  *
 319  * RETURN:      Status
 320  *
 321  * DESCRIPTION: Evaluates a numeric namespace object for a selected device
 322  *              and stores result in *Address.
 323  *
 324  *              NOTE: Internal function, no parameter validation
 325  *
 326  ******************************************************************************/
 327
 328 acpi_status
 329 acpi_ut_evaluate_numeric_object(char *object_name,
 330                                 struct acpi_namespace_node *device_node,
 331                                 acpi_integer * address)
 332 {
 333         union acpi_operand_object *obj_desc;
 334         acpi_status status;
 335
 336         ACPI_FUNCTION_TRACE(ut_evaluate_numeric_object);
 337
 338         status = acpi_ut_evaluate_object(device_node, object_name,
 339                                          ACPI_BTYPE_INTEGER, &obj_desc);
 340         if (ACPI_FAILURE(status)) {
 341                 return_ACPI_STATUS(status);
 342         }
 343
 344         /* Get the returned Integer */
 345
 346         *address = obj_desc->integer.value;
 347
 348         /* On exit, we must delete the return object */
 349
 350         acpi_ut_remove_reference(obj_desc);
 351         return_ACPI_STATUS(status);
 352 }
 353
 354 /*******************************************************************************
 355  *
 356  * FUNCTION:    acpi_ut_copy_id_string
 357  *
 358  * PARAMETERS:  Destination         - Where to copy the string
 359  *              Source              - Source string
 360  *              max_length          - Length of the destination buffer
 361  *
 362  * RETURN:      None
 363  *
 364  * DESCRIPTION: Copies an ID string for the _HID, _CID, and _UID methods.
 365  *              Performs removal of a leading asterisk if present -- workaround
 366  *              for a known issue on a bunch of machines.
 367  *
 368  ******************************************************************************/
 369
 370 static void
 371 acpi_ut_copy_id_string(char *destination, char *source, acpi_size max_length)
 372 {
 373
 374         /*
 375          * Workaround for ID strings that have a leading asterisk. This construct
 376          * is not allowed by the ACPI specification  (ID strings must be
 377          * alphanumeric), but enough existing machines have this embedded in their
 378          * ID strings that the following code is useful.
 379          */
 380         if (*source == '*') {
 381                 source++;
 382         }
 383
 384         /* Do the actual copy */
 385
 386         ACPI_STRNCPY(destination, source, max_length);
 387 }
 388
 389 /*******************************************************************************
 390  *
 391  * FUNCTION:    acpi_ut_execute_HID
 392  *
 393  * PARAMETERS:  device_node         - Node for the device
 394  *              Hid                 - Where the HID is returned
 395  *
 396  * RETURN:      Status
 397  *
 398  * DESCRIPTION: Executes the _HID control method that returns the hardware
 399  *              ID of the device.
 400  *
 401  *              NOTE: Internal function, no parameter validation
 402  *
 403  ******************************************************************************/
 404
 405 acpi_status
 406 acpi_ut_execute_HID(struct acpi_namespace_node *device_node,
 407                     struct acpica_device_id *hid)
 408 {
 409         union acpi_operand_object *obj_desc;
 410         acpi_status status;
 411
 412         ACPI_FUNCTION_TRACE(ut_execute_HID);
 413
 414         status = acpi_ut_evaluate_object(device_node, METHOD_NAME__HID,
 415                                          ACPI_BTYPE_INTEGER | ACPI_BTYPE_STRING,
 416                                          &obj_desc);
 417         if (ACPI_FAILURE(status)) {
 418                 return_ACPI_STATUS(status);
 419         }
 420
 421         if (ACPI_GET_OBJECT_TYPE(obj_desc) == ACPI_TYPE_INTEGER) {
 422
 423                 /* Convert the Numeric HID to string */
 424
 425                 acpi_ex_eisa_id_to_string((u32) obj_desc->integer.value,
 426                                           hid->value);
 427         } else {
 428                 /* Copy the String HID from the returned object */
 429
 430                 acpi_ut_copy_id_string(hid->value, obj_desc->string.pointer,
 431                                        sizeof(hid->value));
 432         }
 433
 434         /* On exit, we must delete the return object */
 435
 436         acpi_ut_remove_reference(obj_desc);
 437         return_ACPI_STATUS(status);
 438 }
 439
 440 /*******************************************************************************
 441  *
 442  * FUNCTION:    acpi_ut_translate_one_cid
 443  *
 444  * PARAMETERS:  obj_desc            - _CID object, must be integer or string
 445  *              one_cid             - Where the CID string is returned
 446  *
 447  * RETURN:      Status
 448  *
 449  * DESCRIPTION: Return a numeric or string _CID value as a string.
 450  *              (Compatible ID)
 451  *
 452  *              NOTE:  Assumes a maximum _CID string length of
 453  *                     ACPI_MAX_CID_LENGTH.
 454  *
 455  ******************************************************************************/
 456
 457 static acpi_status
 458 acpi_ut_translate_one_cid(union acpi_operand_object *obj_desc,
 459                           struct acpi_compatible_id *one_cid)
 460 {
 461
 462         switch (ACPI_GET_OBJECT_TYPE(obj_desc)) {
 463         case ACPI_TYPE_INTEGER:
 464
 465                 /* Convert the Numeric CID to string */
 466
 467                 acpi_ex_eisa_id_to_string((u32) obj_desc->integer.value,
 468                                           one_cid->value);
 469                 return (AE_OK);
 470
 471         case ACPI_TYPE_STRING:
 472
 473                 if (obj_desc->string.length > ACPI_MAX_CID_LENGTH) {
 474                         return (AE_AML_STRING_LIMIT);
 475                 }
 476
 477                 /* Copy the String CID from the returned object */
 478
 479                 acpi_ut_copy_id_string(one_cid->value, obj_desc->string.pointer,
 480                                        ACPI_MAX_CID_LENGTH);
 481                 return (AE_OK);
 482
 483         default:
 484
 485                 return (AE_TYPE);
 486         }
 487 }
 488
 489 /*******************************************************************************
 490  *
 491  * FUNCTION:    acpi_ut_execute_CID
 492  *
 493  * PARAMETERS:  device_node         - Node for the device
 494  *              return_cid_list     - Where the CID list is returned
 495  *
 496  * RETURN:      Status
 497  *
 498  * DESCRIPTION: Executes the _CID control method that returns one or more
 499  *              compatible hardware IDs for the device.
 500  *
 501  *              NOTE: Internal function, no parameter validation
 502  *
 503  ******************************************************************************/
 504
 505 acpi_status
 506 acpi_ut_execute_CID(struct acpi_namespace_node * device_node,
 507                     struct acpi_compatible_id_list ** return_cid_list)
 508 {
 509         union acpi_operand_object *obj_desc;
 510         acpi_status status;
 511         u32 count;
 512         u32 size;
 513         struct acpi_compatible_id_list *cid_list;
 514         u32 i;
 515
 516         ACPI_FUNCTION_TRACE(ut_execute_CID);
 517
 518         /* Evaluate the _CID method for this device */
 519
 520         status = acpi_ut_evaluate_object(device_node, METHOD_NAME__CID,
 521                                          ACPI_BTYPE_INTEGER | ACPI_BTYPE_STRING
 522                                          | ACPI_BTYPE_PACKAGE, &obj_desc);
 523         if (ACPI_FAILURE(status)) {
 524                 return_ACPI_STATUS(status);
 525         }
 526
 527         /* Get the number of _CIDs returned */
 528
 529         count = 1;
 530         if (ACPI_GET_OBJECT_TYPE(obj_desc) == ACPI_TYPE_PACKAGE) {
 531                 count = obj_desc->package.count;
 532         }
 533
 534         /* Allocate a worst-case buffer for the _CIDs */
 535
 536         size = (((count - 1) * sizeof(struct acpi_compatible_id)) +
 537                 sizeof(struct acpi_compatible_id_list));
 538
 539         cid_list = ACPI_ALLOCATE_ZEROED((acpi_size) size);
 540         if (!cid_list) {
 541                 return_ACPI_STATUS(AE_NO_MEMORY);
 542         }
 543
 544         /* Init CID list */
 545
 546         cid_list->count = count;
 547         cid_list->size = size;
 548
 549         /*
 550          *  A _CID can return either a single compatible ID or a package of
 551          *  compatible IDs.  Each compatible ID can be one of the following:
 552          *  1) Integer (32 bit compressed EISA ID) or
 553          *  2) String (PCI ID format, e.g. "PCI\VEN_vvvv&DEV_dddd&SUBSYS_ssssssss")
 554          */
 555
 556         /* The _CID object can be either a single CID or a package (list) of CIDs */
 557
 558         if (ACPI_GET_OBJECT_TYPE(obj_desc) == ACPI_TYPE_PACKAGE) {
 559
 560                 /* Translate each package element */
 561
 562                 for (i = 0; i < count; i++) {
 563                         status =
 564                             acpi_ut_translate_one_cid(obj_desc->package.
 565                                                       elements[i],
 566                                                       &cid_list->id[i]);
 567                         if (ACPI_FAILURE(status)) {
 568                                 break;
 569                         }
 570                 }
 571         } else {
 572                 /* Only one CID, translate to a string */
 573
 574                 status = acpi_ut_translate_one_cid(obj_desc, cid_list->id);
 575         }
 576
 577         /* Cleanup on error */
 578
 579         if (ACPI_FAILURE(status)) {
 580                 ACPI_FREE(cid_list);
 581         } else {
 582                 *return_cid_list = cid_list;
 583         }
 584
 585         /* On exit, we must delete the _CID return object */
 586
 587         acpi_ut_remove_reference(obj_desc);
 588         return_ACPI_STATUS(status);
 589 }
 590
 591 /*******************************************************************************
 592  *
 593  * FUNCTION:    acpi_ut_execute_UID
 594  *
 595  * PARAMETERS:  device_node         - Node for the device
 596  *              Uid                 - Where the UID is returned
 597  *
 598  * RETURN:      Status
 599  *
 600  * DESCRIPTION: Executes the _UID control method that returns the hardware
 601  *              ID of the device.
 602  *
 603  *              NOTE: Internal function, no parameter validation
 604  *
 605  ******************************************************************************/
 606
 607 acpi_status
 608 acpi_ut_execute_UID(struct acpi_namespace_node *device_node,
 609                     struct acpica_device_id *uid)
 610 {
 611         union acpi_operand_object *obj_desc;
 612         acpi_status status;
 613
 614         ACPI_FUNCTION_TRACE(ut_execute_UID);
 615
 616         status = acpi_ut_evaluate_object(device_node, METHOD_NAME__UID,
 617                                          ACPI_BTYPE_INTEGER | ACPI_BTYPE_STRING,
 618                                          &obj_desc);
 619         if (ACPI_FAILURE(status)) {
 620                 return_ACPI_STATUS(status);
 621         }
 622
 623         if (ACPI_GET_OBJECT_TYPE(obj_desc) == ACPI_TYPE_INTEGER) {
 624
 625                 /* Convert the Numeric UID to string */
 626
 627                 acpi_ex_unsigned_integer_to_string(obj_desc->integer.value,
 628                                                    uid->value);
 629         } else {
 630                 /* Copy the String UID from the returned object */
 631
 632                 acpi_ut_copy_id_string(uid->value, obj_desc->string.pointer,
 633                                        sizeof(uid->value));
 634         }
 635
 636         /* On exit, we must delete the return object */
 637
 638         acpi_ut_remove_reference(obj_desc);
 639         return_ACPI_STATUS(status);
 640 }
 641
 642 /*******************************************************************************
 643  *
 644  * FUNCTION:    acpi_ut_execute_STA
 645  *
 646  * PARAMETERS:  device_node         - Node for the device
 647  *              Flags               - Where the status flags are returned
 648  *
 649  * RETURN:      Status
 650  *
 651  * DESCRIPTION: Executes _STA for selected device and stores results in
 652  *              *Flags.
 653  *
 654  *              NOTE: Internal function, no parameter validation
 655  *
 656  ******************************************************************************/
 657
 658 acpi_status
 659 acpi_ut_execute_STA(struct acpi_namespace_node *device_node, u32 * flags)
 660 {
 661         union acpi_operand_object *obj_desc;
 662         acpi_status status;
 663
 664         ACPI_FUNCTION_TRACE(ut_execute_STA);
 665
 666         status = acpi_ut_evaluate_object(device_node, METHOD_NAME__STA,
 667                                          ACPI_BTYPE_INTEGER, &obj_desc);
 668         if (ACPI_FAILURE(status)) {
 669                 if (AE_NOT_FOUND == status) {
 670                         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 671                                           "_STA on %4.4s was not found, assuming device is present\n",
 672                                           acpi_ut_get_node_name(device_node)));
 673
 674                         *flags = ACPI_UINT32_MAX;
 675                         status = AE_OK;
 676                 }
 677
 678                 return_ACPI_STATUS(status);
 679         }
 680
 681         /* Extract the status flags */
 682
 683         *flags = (u32) obj_desc->integer.value;
 684
 685         /* On exit, we must delete the return object */
 686
 687         acpi_ut_remove_reference(obj_desc);
 688         return_ACPI_STATUS(status);
 689 }
 690
 691 /*******************************************************************************
 692  *
 693  * FUNCTION:    acpi_ut_execute_Sxds
 694  *
 695  * PARAMETERS:  device_node         - Node for the device
 696  *              Flags               - Where the status flags are returned
 697  *
 698  * RETURN:      Status
 699  *
 700  * DESCRIPTION: Executes _STA for selected device and stores results in
 701  *              *Flags.
 702  *
 703  *              NOTE: Internal function, no parameter validation
 704  *
 705  ******************************************************************************/
 706
 707 acpi_status
 708 acpi_ut_execute_sxds(struct acpi_namespace_node *device_node, u8 * highest)
 709 {
 710         union acpi_operand_object *obj_desc;
 711         acpi_status status;
 712         u32 i;
 713
 714         ACPI_FUNCTION_TRACE(ut_execute_sxds);
 715
 716         for (i = 0; i < 4; i++) {
 717                 highest[i] = 0xFF;
 718                 status = acpi_ut_evaluate_object(device_node,
 719                                                  ACPI_CAST_PTR(char,
 720                                                                acpi_gbl_highest_dstate_names
 721                                                                [i]),
 722                                                  ACPI_BTYPE_INTEGER, &obj_desc);
 723                 if (ACPI_FAILURE(status)) {
 724                         if (status != AE_NOT_FOUND) {
 725                                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 726                                                   "%s on Device %4.4s, %s\n",
 727                                                   ACPI_CAST_PTR(char,
 728                                                                 acpi_gbl_highest_dstate_names
 729                                                                 [i]),
 730                                                   acpi_ut_get_node_name
 731                                                   (device_node),
 732                                                   acpi_format_exception
 733                                                   (status)));
 734
 735                                 return_ACPI_STATUS(status);
 736                         }
 737                 } else {
 738                         /* Extract the Dstate value */
 739
 740                         highest[i] = (u8) obj_desc->integer.value;
 741
 742                         /* Delete the return object */
 743
 744                         acpi_ut_remove_reference(obj_desc);
 745                 }
 746         }
 747
 748         return_ACPI_STATUS(AE_OK);
 749 }