drivers/acpi/acpica/nsutils.c

   1 /******************************************************************************
   2  *
   3  * Module Name: nsutils - Utilities for accessing ACPI namespace, accessing
   4  *                        parents and siblings and Scope manipulation
   5  *
   6  *****************************************************************************/
   7
   8 /*
   9  * Copyright (C) 2000 - 2010, 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 "amlcode.h"
  49 #include "actables.h"
  50
  51 #define _COMPONENT          ACPI_NAMESPACE
  52 ACPI_MODULE_NAME("nsutils")
  53
  54 /* Local prototypes */
  55 static u8 acpi_ns_valid_path_separator(char sep);
  56
  57 #ifdef ACPI_OBSOLETE_FUNCTIONS
  58 acpi_name acpi_ns_find_parent_name(struct acpi_namespace_node *node_to_search);
  59 #endif
  60
  61 /*******************************************************************************
  62  *
  63  * FUNCTION:    acpi_ns_report_error
  64  *
  65  * PARAMETERS:  module_name         - Caller's module name (for error output)
  66  *              line_number         - Caller's line number (for error output)
  67  *              internal_name       - Name or path of the namespace node
  68  *              lookup_status       - Exception code from NS lookup
  69  *
  70  * RETURN:      None
  71  *
  72  * DESCRIPTION: Print warning message with full pathname
  73  *
  74  ******************************************************************************/
  75
  76 void
  77 acpi_ns_report_error(const char *module_name,
  78                      u32 line_number,
  79                      const char *internal_name, acpi_status lookup_status)
  80 {
  81         acpi_status status;
  82         u32 bad_name;
  83         char *name = NULL;
  84
  85         acpi_os_printf("ACPI Error (%s-%04d): ", module_name, line_number);
  86
  87         if (lookup_status == AE_BAD_CHARACTER) {
  88
  89                 /* There is a non-ascii character in the name */
  90
  91                 ACPI_MOVE_32_TO_32(&bad_name,
  92                                    ACPI_CAST_PTR(u32, internal_name));
  93                 acpi_os_printf("[0x%4.4X] (NON-ASCII)", bad_name);
  94         } else {
  95                 /* Convert path to external format */
  96
  97                 status = acpi_ns_externalize_name(ACPI_UINT32_MAX,
  98                                                   internal_name, NULL, &name);
  99
 100                 /* Print target name */
 101
 102                 if (ACPI_SUCCESS(status)) {
 103                         acpi_os_printf("[%s]", name);
 104                 } else {
 105                         acpi_os_printf("[COULD NOT EXTERNALIZE NAME]");
 106                 }
 107
 108                 if (name) {
 109                         ACPI_FREE(name);
 110                 }
 111         }
 112
 113         acpi_os_printf(" Namespace lookup failure, %s\n",
 114                        acpi_format_exception(lookup_status));
 115 }
 116
 117 /*******************************************************************************
 118  *
 119  * FUNCTION:    acpi_ns_report_method_error
 120  *
 121  * PARAMETERS:  module_name         - Caller's module name (for error output)
 122  *              line_number         - Caller's line number (for error output)
 123  *              Message             - Error message to use on failure
 124  *              prefix_node         - Prefix relative to the path
 125  *              Path                - Path to the node (optional)
 126  *              method_status       - Execution status
 127  *
 128  * RETURN:      None
 129  *
 130  * DESCRIPTION: Print warning message with full pathname
 131  *
 132  ******************************************************************************/
 133
 134 void
 135 acpi_ns_report_method_error(const char *module_name,
 136                             u32 line_number,
 137                             const char *message,
 138                             struct acpi_namespace_node *prefix_node,
 139                             const char *path, acpi_status method_status)
 140 {
 141         acpi_status status;
 142         struct acpi_namespace_node *node = prefix_node;
 143
 144         acpi_os_printf("ACPI Error (%s-%04d): ", module_name, line_number);
 145
 146         if (path) {
 147                 status =
 148                     acpi_ns_get_node(prefix_node, path, ACPI_NS_NO_UPSEARCH,
 149                                      &node);
 150                 if (ACPI_FAILURE(status)) {
 151                         acpi_os_printf("[Could not get node by pathname]");
 152                 }
 153         }
 154
 155         acpi_ns_print_node_pathname(node, message);
 156         acpi_os_printf(", %s\n", acpi_format_exception(method_status));
 157 }
 158
 159 /*******************************************************************************
 160  *
 161  * FUNCTION:    acpi_ns_print_node_pathname
 162  *
 163  * PARAMETERS:  Node            - Object
 164  *              Message         - Prefix message
 165  *
 166  * DESCRIPTION: Print an object's full namespace pathname
 167  *              Manages allocation/freeing of a pathname buffer
 168  *
 169  ******************************************************************************/
 170
 171 void
 172 acpi_ns_print_node_pathname(struct acpi_namespace_node *node,
 173                             const char *message)
 174 {
 175         struct acpi_buffer buffer;
 176         acpi_status status;
 177
 178         if (!node) {
 179                 acpi_os_printf("[NULL NAME]");
 180                 return;
 181         }
 182
 183         /* Convert handle to full pathname and print it (with supplied message) */
 184
 185         buffer.length = ACPI_ALLOCATE_LOCAL_BUFFER;
 186
 187         status = acpi_ns_handle_to_pathname(node, &buffer);
 188         if (ACPI_SUCCESS(status)) {
 189                 if (message) {
 190                         acpi_os_printf("%s ", message);
 191                 }
 192
 193                 acpi_os_printf("[%s] (Node %p)", (char *)buffer.pointer, node);
 194                 ACPI_FREE(buffer.pointer);
 195         }
 196 }
 197
 198 /*******************************************************************************
 199  *
 200  * FUNCTION:    acpi_ns_valid_root_prefix
 201  *
 202  * PARAMETERS:  Prefix          - Character to be checked
 203  *
 204  * RETURN:      TRUE if a valid prefix
 205  *
 206  * DESCRIPTION: Check if a character is a valid ACPI Root prefix
 207  *
 208  ******************************************************************************/
 209
 210 u8 acpi_ns_valid_root_prefix(char prefix)
 211 {
 212
 213         return ((u8) (prefix == '\\'));
 214 }
 215
 216 /*******************************************************************************
 217  *
 218  * FUNCTION:    acpi_ns_valid_path_separator
 219  *
 220  * PARAMETERS:  Sep         - Character to be checked
 221  *
 222  * RETURN:      TRUE if a valid path separator
 223  *
 224  * DESCRIPTION: Check if a character is a valid ACPI path separator
 225  *
 226  ******************************************************************************/
 227
 228 static u8 acpi_ns_valid_path_separator(char sep)
 229 {
 230
 231         return ((u8) (sep == '.'));
 232 }
 233
 234 /*******************************************************************************
 235  *
 236  * FUNCTION:    acpi_ns_get_type
 237  *
 238  * PARAMETERS:  Node        - Parent Node to be examined
 239  *
 240  * RETURN:      Type field from Node whose handle is passed
 241  *
 242  * DESCRIPTION: Return the type of a Namespace node
 243  *
 244  ******************************************************************************/
 245
 246 acpi_object_type acpi_ns_get_type(struct acpi_namespace_node * node)
 247 {
 248         ACPI_FUNCTION_TRACE(ns_get_type);
 249
 250         if (!node) {
 251                 ACPI_WARNING((AE_INFO, "Null Node parameter"));
 252                 return_UINT32(ACPI_TYPE_ANY);
 253         }
 254
 255         return_UINT32((acpi_object_type) node->type);
 256 }
 257
 258 /*******************************************************************************
 259  *
 260  * FUNCTION:    acpi_ns_local
 261  *
 262  * PARAMETERS:  Type        - A namespace object type
 263  *
 264  * RETURN:      LOCAL if names must be found locally in objects of the
 265  *              passed type, 0 if enclosing scopes should be searched
 266  *
 267  * DESCRIPTION: Returns scope rule for the given object type.
 268  *
 269  ******************************************************************************/
 270
 271 u32 acpi_ns_local(acpi_object_type type)
 272 {
 273         ACPI_FUNCTION_TRACE(ns_local);
 274
 275         if (!acpi_ut_valid_object_type(type)) {
 276
 277                 /* Type code out of range  */
 278
 279                 ACPI_WARNING((AE_INFO, "Invalid Object Type %X", type));
 280                 return_UINT32(ACPI_NS_NORMAL);
 281         }
 282
 283         return_UINT32((u32) acpi_gbl_ns_properties[type] & ACPI_NS_LOCAL);
 284 }
 285
 286 /*******************************************************************************
 287  *
 288  * FUNCTION:    acpi_ns_get_internal_name_length
 289  *
 290  * PARAMETERS:  Info            - Info struct initialized with the
 291  *                                external name pointer.
 292  *
 293  * RETURN:      None
 294  *
 295  * DESCRIPTION: Calculate the length of the internal (AML) namestring
 296  *              corresponding to the external (ASL) namestring.
 297  *
 298  ******************************************************************************/
 299
 300 void acpi_ns_get_internal_name_length(struct acpi_namestring_info *info)
 301 {
 302         const char *next_external_char;
 303         u32 i;
 304
 305         ACPI_FUNCTION_ENTRY();
 306
 307         next_external_char = info->external_name;
 308         info->num_carats = 0;
 309         info->num_segments = 0;
 310         info->fully_qualified = FALSE;
 311
 312         /*
 313          * For the internal name, the required length is 4 bytes per segment, plus
 314          * 1 each for root_prefix, multi_name_prefix_op, segment count, trailing null
 315          * (which is not really needed, but no there's harm in putting it there)
 316          *
 317          * strlen() + 1 covers the first name_seg, which has no path separator
 318          */
 319         if (acpi_ns_valid_root_prefix(*next_external_char)) {
 320                 info->fully_qualified = TRUE;
 321                 next_external_char++;
 322
 323                 /* Skip redundant root_prefix, like \\_SB.PCI0.SBRG.EC0 */
 324
 325                 while (acpi_ns_valid_root_prefix(*next_external_char)) {
 326                         next_external_char++;
 327                 }
 328         } else {
 329                 /* Handle Carat prefixes */
 330
 331                 while (*next_external_char == '^') {
 332                         info->num_carats++;
 333                         next_external_char++;
 334                 }
 335         }
 336
 337         /*
 338          * Determine the number of ACPI name "segments" by counting the number of
 339          * path separators within the string. Start with one segment since the
 340          * segment count is [(# separators) + 1], and zero separators is ok.
 341          */
 342         if (*next_external_char) {
 343                 info->num_segments = 1;
 344                 for (i = 0; next_external_char[i]; i++) {
 345                         if (acpi_ns_valid_path_separator(next_external_char[i])) {
 346                                 info->num_segments++;
 347                         }
 348                 }
 349         }
 350
 351         info->length = (ACPI_NAME_SIZE * info->num_segments) +
 352             4 + info->num_carats;
 353
 354         info->next_external_char = next_external_char;
 355 }
 356
 357 /*******************************************************************************
 358  *
 359  * FUNCTION:    acpi_ns_build_internal_name
 360  *
 361  * PARAMETERS:  Info            - Info struct fully initialized
 362  *
 363  * RETURN:      Status
 364  *
 365  * DESCRIPTION: Construct the internal (AML) namestring
 366  *              corresponding to the external (ASL) namestring.
 367  *
 368  ******************************************************************************/
 369
 370 acpi_status acpi_ns_build_internal_name(struct acpi_namestring_info *info)
 371 {
 372         u32 num_segments = info->num_segments;
 373         char *internal_name = info->internal_name;
 374         const char *external_name = info->next_external_char;
 375         char *result = NULL;
 376         u32 i;
 377
 378         ACPI_FUNCTION_TRACE(ns_build_internal_name);
 379
 380         /* Setup the correct prefixes, counts, and pointers */
 381
 382         if (info->fully_qualified) {
 383                 internal_name[0] = '\\';
 384
 385                 if (num_segments <= 1) {
 386                         result = &internal_name[1];
 387                 } else if (num_segments == 2) {
 388                         internal_name[1] = AML_DUAL_NAME_PREFIX;
 389                         result = &internal_name[2];
 390                 } else {
 391                         internal_name[1] = AML_MULTI_NAME_PREFIX_OP;
 392                         internal_name[2] = (char)num_segments;
 393                         result = &internal_name[3];
 394                 }
 395         } else {
 396                 /*
 397                  * Not fully qualified.
 398                  * Handle Carats first, then append the name segments
 399                  */
 400                 i = 0;
 401                 if (info->num_carats) {
 402                         for (i = 0; i < info->num_carats; i++) {
 403                                 internal_name[i] = '^';
 404                         }
 405                 }
 406
 407                 if (num_segments <= 1) {
 408                         result = &internal_name[i];
 409                 } else if (num_segments == 2) {
 410                         internal_name[i] = AML_DUAL_NAME_PREFIX;
 411                         result = &internal_name[(acpi_size) i + 1];
 412                 } else {
 413                         internal_name[i] = AML_MULTI_NAME_PREFIX_OP;
 414                         internal_name[(acpi_size) i + 1] = (char)num_segments;
 415                         result = &internal_name[(acpi_size) i + 2];
 416                 }
 417         }
 418
 419         /* Build the name (minus path separators) */
 420
 421         for (; num_segments; num_segments--) {
 422                 for (i = 0; i < ACPI_NAME_SIZE; i++) {
 423                         if (acpi_ns_valid_path_separator(*external_name) ||
 424                             (*external_name == 0)) {
 425
 426                                 /* Pad the segment with underscore(s) if segment is short */
 427
 428                                 result[i] = '_';
 429                         } else {
 430                                 /* Convert the character to uppercase and save it */
 431
 432                                 result[i] =
 433                                     (char)ACPI_TOUPPER((int)*external_name);
 434                                 external_name++;
 435                         }
 436                 }
 437
 438                 /* Now we must have a path separator, or the pathname is bad */
 439
 440                 if (!acpi_ns_valid_path_separator(*external_name) &&
 441                     (*external_name != 0)) {
 442                         return_ACPI_STATUS(AE_BAD_PARAMETER);
 443                 }
 444
 445                 /* Move on the next segment */
 446
 447                 external_name++;
 448                 result += ACPI_NAME_SIZE;
 449         }
 450
 451         /* Terminate the string */
 452
 453         *result = 0;
 454
 455         if (info->fully_qualified) {
 456                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 457                                   "Returning [%p] (abs) \"\\%s\"\n",
 458                                   internal_name, internal_name));
 459         } else {
 460                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Returning [%p] (rel) \"%s\"\n",
 461                                   internal_name, internal_name));
 462         }
 463
 464         return_ACPI_STATUS(AE_OK);
 465 }
 466
 467 /*******************************************************************************
 468  *
 469  * FUNCTION:    acpi_ns_internalize_name
 470  *
 471  * PARAMETERS:  *external_name          - External representation of name
 472  *              **Converted Name        - Where to return the resulting
 473  *                                        internal represention of the name
 474  *
 475  * RETURN:      Status
 476  *
 477  * DESCRIPTION: Convert an external representation (e.g. "\_PR_.CPU0")
 478  *              to internal form (e.g. 5c 2f 02 5f 50 52 5f 43 50 55 30)
 479  *
 480  *******************************************************************************/
 481
 482 acpi_status
 483 acpi_ns_internalize_name(const char *external_name, char **converted_name)
 484 {
 485         char *internal_name;
 486         struct acpi_namestring_info info;
 487         acpi_status status;
 488
 489         ACPI_FUNCTION_TRACE(ns_internalize_name);
 490
 491         if ((!external_name) || (*external_name == 0) || (!converted_name)) {
 492                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 493         }
 494
 495         /* Get the length of the new internal name */
 496
 497         info.external_name = external_name;
 498         acpi_ns_get_internal_name_length(&info);
 499
 500         /* We need a segment to store the internal  name */
 501
 502         internal_name = ACPI_ALLOCATE_ZEROED(info.length);
 503         if (!internal_name) {
 504                 return_ACPI_STATUS(AE_NO_MEMORY);
 505         }
 506
 507         /* Build the name */
 508
 509         info.internal_name = internal_name;
 510         status = acpi_ns_build_internal_name(&info);
 511         if (ACPI_FAILURE(status)) {
 512                 ACPI_FREE(internal_name);
 513                 return_ACPI_STATUS(status);
 514         }
 515
 516         *converted_name = internal_name;
 517         return_ACPI_STATUS(AE_OK);
 518 }
 519
 520 /*******************************************************************************
 521  *
 522  * FUNCTION:    acpi_ns_externalize_name
 523  *
 524  * PARAMETERS:  internal_name_length - Lenth of the internal name below
 525  *              internal_name       - Internal representation of name
 526  *              converted_name_length - Where the length is returned
 527  *              converted_name      - Where the resulting external name
 528  *                                    is returned
 529  *
 530  * RETURN:      Status
 531  *
 532  * DESCRIPTION: Convert internal name (e.g. 5c 2f 02 5f 50 52 5f 43 50 55 30)
 533  *              to its external (printable) form (e.g. "\_PR_.CPU0")
 534  *
 535  ******************************************************************************/
 536
 537 acpi_status
 538 acpi_ns_externalize_name(u32 internal_name_length,
 539                          const char *internal_name,
 540                          u32 * converted_name_length, char **converted_name)
 541 {
 542         u32 names_index = 0;
 543         u32 num_segments = 0;
 544         u32 required_length;
 545         u32 prefix_length = 0;
 546         u32 i = 0;
 547         u32 j = 0;
 548
 549         ACPI_FUNCTION_TRACE(ns_externalize_name);
 550
 551         if (!internal_name_length || !internal_name || !converted_name) {
 552                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 553         }
 554
 555         /* Check for a prefix (one '\' | one or more '^') */
 556
 557         switch (internal_name[0]) {
 558         case '\\':
 559                 prefix_length = 1;
 560                 break;
 561
 562         case '^':
 563                 for (i = 0; i < internal_name_length; i++) {
 564                         if (internal_name[i] == '^') {
 565                                 prefix_length = i + 1;
 566                         } else {
 567                                 break;
 568                         }
 569                 }
 570
 571                 if (i == internal_name_length) {
 572                         prefix_length = i;
 573                 }
 574
 575                 break;
 576
 577         default:
 578                 break;
 579         }
 580
 581         /*
 582          * Check for object names. Note that there could be 0-255 of these
 583          * 4-byte elements.
 584          */
 585         if (prefix_length < internal_name_length) {
 586                 switch (internal_name[prefix_length]) {
 587                 case AML_MULTI_NAME_PREFIX_OP:
 588
 589                         /* <count> 4-byte names */
 590
 591                         names_index = prefix_length + 2;
 592                         num_segments = (u8)
 593                             internal_name[(acpi_size) prefix_length + 1];
 594                         break;
 595
 596                 case AML_DUAL_NAME_PREFIX:
 597
 598                         /* Two 4-byte names */
 599
 600                         names_index = prefix_length + 1;
 601                         num_segments = 2;
 602                         break;
 603
 604                 case 0:
 605
 606                         /* null_name */
 607
 608                         names_index = 0;
 609                         num_segments = 0;
 610                         break;
 611
 612                 default:
 613
 614                         /* one 4-byte name */
 615
 616                         names_index = prefix_length;
 617                         num_segments = 1;
 618                         break;
 619                 }
 620         }
 621
 622         /*
 623          * Calculate the length of converted_name, which equals the length
 624          * of the prefix, length of all object names, length of any required
 625          * punctuation ('.') between object names, plus the NULL terminator.
 626          */
 627         required_length = prefix_length + (4 * num_segments) +
 628             ((num_segments > 0) ? (num_segments - 1) : 0) + 1;
 629
 630         /*
 631          * Check to see if we're still in bounds.  If not, there's a problem
 632          * with internal_name (invalid format).
 633          */
 634         if (required_length > internal_name_length) {
 635                 ACPI_ERROR((AE_INFO, "Invalid internal name"));
 636                 return_ACPI_STATUS(AE_BAD_PATHNAME);
 637         }
 638
 639         /* Build the converted_name */
 640
 641         *converted_name = ACPI_ALLOCATE_ZEROED(required_length);
 642         if (!(*converted_name)) {
 643                 return_ACPI_STATUS(AE_NO_MEMORY);
 644         }
 645
 646         j = 0;
 647
 648         for (i = 0; i < prefix_length; i++) {
 649                 (*converted_name)[j++] = internal_name[i];
 650         }
 651
 652         if (num_segments > 0) {
 653                 for (i = 0; i < num_segments; i++) {
 654                         if (i > 0) {
 655                                 (*converted_name)[j++] = '.';
 656                         }
 657
 658                         (*converted_name)[j++] = internal_name[names_index++];
 659                         (*converted_name)[j++] = internal_name[names_index++];
 660                         (*converted_name)[j++] = internal_name[names_index++];
 661                         (*converted_name)[j++] = internal_name[names_index++];
 662                 }
 663         }
 664
 665         if (converted_name_length) {
 666                 *converted_name_length = (u32) required_length;
 667         }
 668
 669         return_ACPI_STATUS(AE_OK);
 670 }
 671
 672 /*******************************************************************************
 673  *
 674  * FUNCTION:    acpi_ns_validate_handle
 675  *
 676  * PARAMETERS:  Handle          - Handle to be validated and typecast to a
 677  *                                namespace node.
 678  *
 679  * RETURN:      A pointer to a namespace node
 680  *
 681  * DESCRIPTION: Convert a namespace handle to a namespace node. Handles special
 682  *              cases for the root node.
 683  *
 684  * NOTE: Real integer handles would allow for more verification
 685  *       and keep all pointers within this subsystem - however this introduces
 686  *       more overhead and has not been necessary to this point. Drivers
 687  *       holding handles are typically notified before a node becomes invalid
 688  *       due to a table unload.
 689  *
 690  ******************************************************************************/
 691
 692 struct acpi_namespace_node *acpi_ns_validate_handle(acpi_handle handle)
 693 {
 694
 695         ACPI_FUNCTION_ENTRY();
 696
 697         /* Parameter validation */
 698
 699         if ((!handle) || (handle == ACPI_ROOT_OBJECT)) {
 700                 return (acpi_gbl_root_node);
 701         }
 702
 703         /* We can at least attempt to verify the handle */
 704
 705         if (ACPI_GET_DESCRIPTOR_TYPE(handle) != ACPI_DESC_TYPE_NAMED) {
 706                 return (NULL);
 707         }
 708
 709         return (ACPI_CAST_PTR(struct acpi_namespace_node, handle));
 710 }
 711
 712 /*******************************************************************************
 713  *
 714  * FUNCTION:    acpi_ns_terminate
 715  *
 716  * PARAMETERS:  none
 717  *
 718  * RETURN:      none
 719  *
 720  * DESCRIPTION: free memory allocated for namespace and ACPI table storage.
 721  *
 722  ******************************************************************************/
 723
 724 void acpi_ns_terminate(void)
 725 {
 726         union acpi_operand_object *obj_desc;
 727
 728         ACPI_FUNCTION_TRACE(ns_terminate);
 729
 730         /*
 731          * 1) Free the entire namespace -- all nodes and objects
 732          *
 733          * Delete all object descriptors attached to namepsace nodes
 734          */
 735         acpi_ns_delete_namespace_subtree(acpi_gbl_root_node);
 736
 737         /* Detach any objects attached to the root */
 738
 739         obj_desc = acpi_ns_get_attached_object(acpi_gbl_root_node);
 740         if (obj_desc) {
 741                 acpi_ns_detach_object(acpi_gbl_root_node);
 742         }
 743
 744         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Namespace freed\n"));
 745         return_VOID;
 746 }
 747
 748 /*******************************************************************************
 749  *
 750  * FUNCTION:    acpi_ns_opens_scope
 751  *
 752  * PARAMETERS:  Type        - A valid namespace type
 753  *
 754  * RETURN:      NEWSCOPE if the passed type "opens a name scope" according
 755  *              to the ACPI specification, else 0
 756  *
 757  ******************************************************************************/
 758
 759 u32 acpi_ns_opens_scope(acpi_object_type type)
 760 {
 761         ACPI_FUNCTION_TRACE_STR(ns_opens_scope, acpi_ut_get_type_name(type));
 762
 763         if (!acpi_ut_valid_object_type(type)) {
 764
 765                 /* type code out of range  */
 766
 767                 ACPI_WARNING((AE_INFO, "Invalid Object Type %X", type));
 768                 return_UINT32(ACPI_NS_NORMAL);
 769         }
 770
 771         return_UINT32(((u32) acpi_gbl_ns_properties[type]) & ACPI_NS_NEWSCOPE);
 772 }
 773
 774 /*******************************************************************************
 775  *
 776  * FUNCTION:    acpi_ns_get_node
 777  *
 778  * PARAMETERS:  *Pathname   - Name to be found, in external (ASL) format. The
 779  *                            \ (backslash) and ^ (carat) prefixes, and the
 780  *                            . (period) to separate segments are supported.
 781  *              prefix_node  - Root of subtree to be searched, or NS_ALL for the
 782  *                            root of the name space.  If Name is fully
 783  *                            qualified (first s8 is '\'), the passed value
 784  *                            of Scope will not be accessed.
 785  *              Flags       - Used to indicate whether to perform upsearch or
 786  *                            not.
 787  *              return_node - Where the Node is returned
 788  *
 789  * DESCRIPTION: Look up a name relative to a given scope and return the
 790  *              corresponding Node.  NOTE: Scope can be null.
 791  *
 792  * MUTEX:       Locks namespace
 793  *
 794  ******************************************************************************/
 795
 796 acpi_status
 797 acpi_ns_get_node(struct acpi_namespace_node *prefix_node,
 798                  const char *pathname,
 799                  u32 flags, struct acpi_namespace_node **return_node)
 800 {
 801         union acpi_generic_state scope_info;
 802         acpi_status status;
 803         char *internal_path;
 804
 805         ACPI_FUNCTION_TRACE_PTR(ns_get_node, ACPI_CAST_PTR(char, pathname));
 806
 807         if (!pathname) {
 808                 *return_node = prefix_node;
 809                 if (!prefix_node) {
 810                         *return_node = acpi_gbl_root_node;
 811                 }
 812                 return_ACPI_STATUS(AE_OK);
 813         }
 814
 815         /* Convert path to internal representation */
 816
 817         status = acpi_ns_internalize_name(pathname, &internal_path);
 818         if (ACPI_FAILURE(status)) {
 819                 return_ACPI_STATUS(status);
 820         }
 821
 822         /* Must lock namespace during lookup */
 823
 824         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
 825         if (ACPI_FAILURE(status)) {
 826                 goto cleanup;
 827         }
 828
 829         /* Setup lookup scope (search starting point) */
 830
 831         scope_info.scope.node = prefix_node;
 832
 833         /* Lookup the name in the namespace */
 834
 835         status = acpi_ns_lookup(&scope_info, internal_path, ACPI_TYPE_ANY,
 836                                 ACPI_IMODE_EXECUTE,
 837                                 (flags | ACPI_NS_DONT_OPEN_SCOPE), NULL,
 838                                 return_node);
 839         if (ACPI_FAILURE(status)) {
 840                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "%s, %s\n",
 841                                   pathname, acpi_format_exception(status)));
 842         }
 843
 844         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 845
 846       cleanup:
 847         ACPI_FREE(internal_path);
 848         return_ACPI_STATUS(status);
 849 }
 850
 851 /*******************************************************************************
 852  *
 853  * FUNCTION:    acpi_ns_get_parent_node
 854  *
 855  * PARAMETERS:  Node       - Current table entry
 856  *
 857  * RETURN:      Parent entry of the given entry
 858  *
 859  * DESCRIPTION: Obtain the parent entry for a given entry in the namespace.
 860  *
 861  ******************************************************************************/
 862
 863 struct acpi_namespace_node *acpi_ns_get_parent_node(struct acpi_namespace_node
 864                                                     *node)
 865 {
 866         ACPI_FUNCTION_ENTRY();
 867
 868         if (!node) {
 869                 return (NULL);
 870         }
 871
 872         /*
 873          * Walk to the end of this peer list. The last entry is marked with a flag
 874          * and the peer pointer is really a pointer back to the parent. This saves
 875          * putting a parent back pointer in each and every named object!
 876          */
 877         while (!(node->flags & ANOBJ_END_OF_PEER_LIST)) {
 878                 node = node->peer;
 879         }
 880
 881         return (node->peer);
 882 }
 883
 884 /*******************************************************************************
 885  *
 886  * FUNCTION:    acpi_ns_get_next_valid_node
 887  *
 888  * PARAMETERS:  Node       - Current table entry
 889  *
 890  * RETURN:      Next valid Node in the linked node list. NULL if no more valid
 891  *              nodes.
 892  *
 893  * DESCRIPTION: Find the next valid node within a name table.
 894  *              Useful for implementing NULL-end-of-list loops.
 895  *
 896  ******************************************************************************/
 897
 898 struct acpi_namespace_node *acpi_ns_get_next_valid_node(struct
 899                                                         acpi_namespace_node
 900                                                         *node)
 901 {
 902
 903         /* If we are at the end of this peer list, return NULL */
 904
 905         if (node->flags & ANOBJ_END_OF_PEER_LIST) {
 906                 return NULL;
 907         }
 908
 909         /* Otherwise just return the next peer */
 910
 911         return (node->peer);
 912 }
 913
 914 #ifdef ACPI_OBSOLETE_FUNCTIONS
 915 /*******************************************************************************
 916  *
 917  * FUNCTION:    acpi_ns_find_parent_name
 918  *
 919  * PARAMETERS:  *child_node            - Named Obj whose name is to be found
 920  *
 921  * RETURN:      The ACPI name
 922  *
 923  * DESCRIPTION: Search for the given obj in its parent scope and return the
 924  *              name segment, or "????" if the parent name can't be found
 925  *              (which "should not happen").
 926  *
 927  ******************************************************************************/
 928
 929 acpi_name acpi_ns_find_parent_name(struct acpi_namespace_node * child_node)
 930 {
 931         struct acpi_namespace_node *parent_node;
 932
 933         ACPI_FUNCTION_TRACE(ns_find_parent_name);
 934
 935         if (child_node) {
 936
 937                 /* Valid entry.  Get the parent Node */
 938
 939                 parent_node = acpi_ns_get_parent_node(child_node);
 940                 if (parent_node) {
 941                         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 942                                           "Parent of %p [%4.4s] is %p [%4.4s]\n",
 943                                           child_node,
 944                                           acpi_ut_get_node_name(child_node),
 945                                           parent_node,
 946                                           acpi_ut_get_node_name(parent_node)));
 947
 948                         if (parent_node->name.integer) {
 949                                 return_VALUE((acpi_name) parent_node->name.
 950                                              integer);
 951                         }
 952                 }
 953
 954                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 955                                   "Unable to find parent of %p (%4.4s)\n",
 956                                   child_node,
 957                                   acpi_ut_get_node_name(child_node)));
 958         }
 959
 960         return_VALUE(ACPI_UNKNOWN_NAME);
 961 }
 962 #endif