Pileus Git - ~andy/linux/blob - drivers/acpi/namespace/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 - 2008, Intel Corp.
  10  * All rights reserved.
  11  *
  12  * Redistribution and use in source and binary forms, with or without
  13  * modification, are permitted provided that the following conditions
  14  * are met:
  15  * 1. Redistributions of source code must retain the above copyright
  16  *    notice, this list of conditions, and the following disclaimer,
  17  *    without modification.
  18  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  19  *    substantially similar to the "NO WARRANTY" disclaimer below
  20  *    ("Disclaimer") and any redistribution must be conditioned upon
  21  *    including a substantially similar Disclaimer requirement for further
  22  *    binary redistribution.
  23  * 3. Neither the names of the above-listed copyright holders nor the names
  24  *    of any contributors may be used to endorse or promote products derived
  25  *    from this software without specific prior written permission.
  26  *
  27  * Alternatively, this software may be distributed under the terms of the
  28  * GNU General Public License ("GPL") version 2 as published by the Free
  29  * Software Foundation.
  30  *
  31  * NO WARRANTY
  32  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  33  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  34  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  35  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  36  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  37  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  38  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  39  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  40  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  41  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  42  * POSSIBILITY OF SUCH DAMAGES.
  43  */
  44
  45 #include <acpi/acpi.h>
  46 #include <acpi/acnamesp.h>
  47 #include <acpi/amlcode.h>
  48 #include <acpi/actables.h>
  49
  50 #define _COMPONENT          ACPI_NAMESPACE
  51 ACPI_MODULE_NAME("nsutils")
  52
  53 /* Local prototypes */
  54 static u8 acpi_ns_valid_path_separator(char sep);
  55
  56 #ifdef ACPI_OBSOLETE_FUNCTIONS
  57 acpi_name acpi_ns_find_parent_name(struct acpi_namespace_node *node_to_search);
  58 #endif
  59
  60 /*******************************************************************************
  61  *
  62  * FUNCTION:    acpi_ns_report_error
  63  *
  64  * PARAMETERS:  module_name         - Caller's module name (for error output)
  65  *              line_number         - Caller's line number (for error output)
  66  *              internal_name       - Name or path of the namespace node
  67  *              lookup_status       - Exception code from NS lookup
  68  *
  69  * RETURN:      None
  70  *
  71  * DESCRIPTION: Print warning message with full pathname
  72  *
  73  ******************************************************************************/
  74
  75 void
  76 acpi_ns_report_error(const char *module_name,
  77                      u32 line_number,
  78                      const char *internal_name, acpi_status lookup_status)
  79 {
  80         acpi_status status;
  81         u32 bad_name;
  82         char *name = NULL;
  83
  84         acpi_os_printf("ACPI Error (%s-%04d): ", module_name, line_number);
  85
  86         if (lookup_status == AE_BAD_CHARACTER) {
  87
  88                 /* There is a non-ascii character in the name */
  89
  90                 ACPI_MOVE_32_TO_32(&bad_name, internal_name);
  91                 acpi_os_printf("[0x%4.4X] (NON-ASCII)", bad_name);
  92         } else {
  93                 /* Convert path to external format */
  94
  95                 status = acpi_ns_externalize_name(ACPI_UINT32_MAX,
  96                                                   internal_name, NULL, &name);
  97
  98                 /* Print target name */
  99
 100                 if (ACPI_SUCCESS(status)) {
 101                         acpi_os_printf("[%s]", name);
 102                 } else {
 103                         acpi_os_printf("[COULD NOT EXTERNALIZE NAME]");
 104                 }
 105
 106                 if (name) {
 107                         ACPI_FREE(name);
 108                 }
 109         }
 110
 111         acpi_os_printf(" Namespace lookup failure, %s\n",
 112                        acpi_format_exception(lookup_status));
 113 }
 114
 115 /*******************************************************************************
 116  *
 117  * FUNCTION:    acpi_ns_report_method_error
 118  *
 119  * PARAMETERS:  module_name         - Caller's module name (for error output)
 120  *              line_number         - Caller's line number (for error output)
 121  *              Message             - Error message to use on failure
 122  *              prefix_node         - Prefix relative to the path
 123  *              Path                - Path to the node (optional)
 124  *              method_status       - Execution status
 125  *
 126  * RETURN:      None
 127  *
 128  * DESCRIPTION: Print warning message with full pathname
 129  *
 130  ******************************************************************************/
 131
 132 void
 133 acpi_ns_report_method_error(const char *module_name,
 134                             u32 line_number,
 135                             const char *message,
 136                             struct acpi_namespace_node *prefix_node,
 137                             const char *path, acpi_status method_status)
 138 {
 139         acpi_status status;
 140         struct acpi_namespace_node *node = prefix_node;
 141
 142         acpi_os_printf("ACPI Error (%s-%04d): ", module_name, line_number);
 143
 144         if (path) {
 145                 status =
 146                     acpi_ns_get_node(prefix_node, path, ACPI_NS_NO_UPSEARCH,
 147                                      &node);
 148                 if (ACPI_FAILURE(status)) {
 149                         acpi_os_printf("[Could not get node by pathname]");
 150                 }
 151         }
 152
 153         acpi_ns_print_node_pathname(node, message);
 154         acpi_os_printf(", %s\n", acpi_format_exception(method_status));
 155 }
 156
 157 /*******************************************************************************
 158  *
 159  * FUNCTION:    acpi_ns_print_node_pathname
 160  *
 161  * PARAMETERS:  Node            - Object
 162  *              Message         - Prefix message
 163  *
 164  * DESCRIPTION: Print an object's full namespace pathname
 165  *              Manages allocation/freeing of a pathname buffer
 166  *
 167  ******************************************************************************/
 168
 169 void
 170 acpi_ns_print_node_pathname(struct acpi_namespace_node *node,
 171                             const char *message)
 172 {
 173         struct acpi_buffer buffer;
 174         acpi_status status;
 175
 176         if (!node) {
 177                 acpi_os_printf("[NULL NAME]");
 178                 return;
 179         }
 180
 181         /* Convert handle to full pathname and print it (with supplied message) */
 182
 183         buffer.length = ACPI_ALLOCATE_LOCAL_BUFFER;
 184
 185         status = acpi_ns_handle_to_pathname(node, &buffer);
 186         if (ACPI_SUCCESS(status)) {
 187                 if (message) {
 188                         acpi_os_printf("%s ", message);
 189                 }
 190
 191                 acpi_os_printf("[%s] (Node %p)", (char *)buffer.pointer, node);
 192                 ACPI_FREE(buffer.pointer);
 193         }
 194 }
 195
 196 /*******************************************************************************
 197  *
 198  * FUNCTION:    acpi_ns_valid_root_prefix
 199  *
 200  * PARAMETERS:  Prefix          - Character to be checked
 201  *
 202  * RETURN:      TRUE if a valid prefix
 203  *
 204  * DESCRIPTION: Check if a character is a valid ACPI Root prefix
 205  *
 206  ******************************************************************************/
 207
 208 u8 acpi_ns_valid_root_prefix(char prefix)
 209 {
 210
 211         return ((u8) (prefix == '\\'));
 212 }
 213
 214 /*******************************************************************************
 215  *
 216  * FUNCTION:    acpi_ns_valid_path_separator
 217  *
 218  * PARAMETERS:  Sep         - Character to be checked
 219  *
 220  * RETURN:      TRUE if a valid path separator
 221  *
 222  * DESCRIPTION: Check if a character is a valid ACPI path separator
 223  *
 224  ******************************************************************************/
 225
 226 static u8 acpi_ns_valid_path_separator(char sep)
 227 {
 228
 229         return ((u8) (sep == '.'));
 230 }
 231
 232 /*******************************************************************************
 233  *
 234  * FUNCTION:    acpi_ns_get_type
 235  *
 236  * PARAMETERS:  Node        - Parent Node to be examined
 237  *
 238  * RETURN:      Type field from Node whose handle is passed
 239  *
 240  * DESCRIPTION: Return the type of a Namespace node
 241  *
 242  ******************************************************************************/
 243
 244 acpi_object_type acpi_ns_get_type(struct acpi_namespace_node * node)
 245 {
 246         ACPI_FUNCTION_TRACE(ns_get_type);
 247
 248         if (!node) {
 249                 ACPI_WARNING((AE_INFO, "Null Node parameter"));
 250                 return_UINT32(ACPI_TYPE_ANY);
 251         }
 252
 253         return_UINT32((acpi_object_type) node->type);
 254 }
 255
 256 /*******************************************************************************
 257  *
 258  * FUNCTION:    acpi_ns_local
 259  *
 260  * PARAMETERS:  Type        - A namespace object type
 261  *
 262  * RETURN:      LOCAL if names must be found locally in objects of the
 263  *              passed type, 0 if enclosing scopes should be searched
 264  *
 265  * DESCRIPTION: Returns scope rule for the given object type.
 266  *
 267  ******************************************************************************/
 268
 269 u32 acpi_ns_local(acpi_object_type type)
 270 {
 271         ACPI_FUNCTION_TRACE(ns_local);
 272
 273         if (!acpi_ut_valid_object_type(type)) {
 274
 275                 /* Type code out of range  */
 276
 277                 ACPI_WARNING((AE_INFO, "Invalid Object Type %X", type));
 278                 return_UINT32(ACPI_NS_NORMAL);
 279         }
 280
 281         return_UINT32((u32) acpi_gbl_ns_properties[type] & ACPI_NS_LOCAL);
 282 }
 283
 284 /*******************************************************************************
 285  *
 286  * FUNCTION:    acpi_ns_get_internal_name_length
 287  *
 288  * PARAMETERS:  Info            - Info struct initialized with the
 289  *                                external name pointer.
 290  *
 291  * RETURN:      None
 292  *
 293  * DESCRIPTION: Calculate the length of the internal (AML) namestring
 294  *              corresponding to the external (ASL) namestring.
 295  *
 296  ******************************************************************************/
 297
 298 void acpi_ns_get_internal_name_length(struct acpi_namestring_info *info)
 299 {
 300         const char *next_external_char;
 301         u32 i;
 302
 303         ACPI_FUNCTION_ENTRY();
 304
 305         next_external_char = info->external_name;
 306         info->num_carats = 0;
 307         info->num_segments = 0;
 308         info->fully_qualified = FALSE;
 309
 310         /*
 311          * For the internal name, the required length is 4 bytes per segment, plus
 312          * 1 each for root_prefix, multi_name_prefix_op, segment count, trailing null
 313          * (which is not really needed, but no there's harm in putting it there)
 314          *
 315          * strlen() + 1 covers the first name_seg, which has no path separator
 316          */
 317         if (acpi_ns_valid_root_prefix(*next_external_char)) {
 318                 info->fully_qualified = TRUE;
 319                 next_external_char++;
 320
 321                 /* Skip redundant root_prefix, like \\_SB.PCI0.SBRG.EC0 */
 322
 323                 while (acpi_ns_valid_root_prefix(*next_external_char)) {
 324                         next_external_char++;
 325                 }
 326         } else {
 327                 /*
 328                  * Handle Carat prefixes
 329                  */
 330                 while (*next_external_char == '^') {
 331                         info->num_carats++;
 332                         next_external_char++;
 333                 }
 334         }
 335
 336         /*
 337          * Determine the number of ACPI name "segments" by counting the number of
 338          * path separators within the string. Start with one segment since the
 339          * segment count is [(# separators) + 1], and zero separators is ok.
 340          */
 341         if (*next_external_char) {
 342                 info->num_segments = 1;
 343                 for (i = 0; next_external_char[i]; i++) {
 344                         if (acpi_ns_valid_path_separator(next_external_char[i])) {
 345                                 info->num_segments++;
 346                         }
 347                 }
 348         }
 349
 350         info->length = (ACPI_NAME_SIZE * info->num_segments) +
 351             4 + info->num_carats;
 352
 353         info->next_external_char = next_external_char;
 354 }
 355
 356 /*******************************************************************************
 357  *
 358  * FUNCTION:    acpi_ns_build_internal_name
 359  *
 360  * PARAMETERS:  Info            - Info struct fully initialized
 361  *
 362  * RETURN:      Status
 363  *
 364  * DESCRIPTION: Construct the internal (AML) namestring
 365  *              corresponding to the external (ASL) namestring.
 366  *
 367  ******************************************************************************/
 368
 369 acpi_status acpi_ns_build_internal_name(struct acpi_namestring_info *info)
 370 {
 371         u32 num_segments = info->num_segments;
 372         char *internal_name = info->internal_name;
 373         const char *external_name = info->next_external_char;
 374         char *result = NULL;
 375         u32 i;
 376
 377         ACPI_FUNCTION_TRACE(ns_build_internal_name);
 378
 379         /* Setup the correct prefixes, counts, and pointers */
 380
 381         if (info->fully_qualified) {
 382                 internal_name[0] = '\\';
 383
 384                 if (num_segments <= 1) {
 385                         result = &internal_name[1];
 386                 } else if (num_segments == 2) {
 387                         internal_name[1] = AML_DUAL_NAME_PREFIX;
 388                         result = &internal_name[2];
 389                 } else {
 390                         internal_name[1] = AML_MULTI_NAME_PREFIX_OP;
 391                         internal_name[2] = (char)num_segments;
 392                         result = &internal_name[3];
 393                 }
 394         } else {
 395                 /*
 396                  * Not fully qualified.
 397                  * Handle Carats first, then append the name segments
 398                  */
 399                 i = 0;
 400                 if (info->num_carats) {
 401                         for (i = 0; i < info->num_carats; i++) {
 402                                 internal_name[i] = '^';
 403                         }
 404                 }
 405
 406                 if (num_segments <= 1) {
 407                         result = &internal_name[i];
 408                 } else if (num_segments == 2) {
 409                         internal_name[i] = AML_DUAL_NAME_PREFIX;
 410                         result = &internal_name[(acpi_size) i + 1];
 411                 } else {
 412                         internal_name[i] = AML_MULTI_NAME_PREFIX_OP;
 413                         internal_name[(acpi_size) i + 1] = (char)num_segments;
 414                         result = &internal_name[(acpi_size) i + 2];
 415                 }
 416         }
 417
 418         /* Build the name (minus path separators) */
 419
 420         for (; num_segments; num_segments--) {
 421                 for (i = 0; i < ACPI_NAME_SIZE; i++) {
 422                         if (acpi_ns_valid_path_separator(*external_name) ||
 423                             (*external_name == 0)) {
 424
 425                                 /* Pad the segment with underscore(s) if segment is short */
 426
 427                                 result[i] = '_';
 428                         } else {
 429                                 /* Convert the character to uppercase and save it */
 430
 431                                 result[i] =
 432                                     (char)ACPI_TOUPPER((int)*external_name);
 433                                 external_name++;
 434                         }
 435                 }
 436
 437                 /* Now we must have a path separator, or the pathname is bad */
 438
 439                 if (!acpi_ns_valid_path_separator(*external_name) &&
 440                     (*external_name != 0)) {
 441                         return_ACPI_STATUS(AE_BAD_PARAMETER);
 442                 }
 443
 444                 /* Move on the next segment */
 445
 446                 external_name++;
 447                 result += ACPI_NAME_SIZE;
 448         }
 449
 450         /* Terminate the string */
 451
 452         *result = 0;
 453
 454         if (info->fully_qualified) {
 455                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 456                                   "Returning [%p] (abs) \"\\%s\"\n",
 457                                   internal_name, internal_name));
 458         } else {
 459                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Returning [%p] (rel) \"%s\"\n",
 460                                   internal_name, internal_name));
 461         }
 462
 463         return_ACPI_STATUS(AE_OK);
 464 }
 465
 466 /*******************************************************************************
 467  *
 468  * FUNCTION:    acpi_ns_internalize_name
 469  *
 470  * PARAMETERS:  *external_name          - External representation of name
 471  *              **Converted Name        - Where to return the resulting
 472  *                                        internal represention of the name
 473  *
 474  * RETURN:      Status
 475  *
 476  * DESCRIPTION: Convert an external representation (e.g. "\_PR_.CPU0")
 477  *              to internal form (e.g. 5c 2f 02 5f 50 52 5f 43 50 55 30)
 478  *
 479  *******************************************************************************/
 480
 481 acpi_status
 482 acpi_ns_internalize_name(const char *external_name, char **converted_name)
 483 {
 484         char *internal_name;
 485         struct acpi_namestring_info info;
 486         acpi_status status;
 487
 488         ACPI_FUNCTION_TRACE(ns_internalize_name);
 489
 490         if ((!external_name) || (*external_name == 0) || (!converted_name)) {
 491                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 492         }
 493
 494         /* Get the length of the new internal name */
 495
 496         info.external_name = external_name;
 497         acpi_ns_get_internal_name_length(&info);
 498
 499         /* We need a segment to store the internal  name */
 500
 501         internal_name = ACPI_ALLOCATE_ZEROED(info.length);
 502         if (!internal_name) {
 503                 return_ACPI_STATUS(AE_NO_MEMORY);
 504         }
 505
 506         /* Build the name */
 507
 508         info.internal_name = internal_name;
 509         status = acpi_ns_build_internal_name(&info);
 510         if (ACPI_FAILURE(status)) {
 511                 ACPI_FREE(internal_name);
 512                 return_ACPI_STATUS(status);
 513         }
 514
 515         *converted_name = internal_name;
 516         return_ACPI_STATUS(AE_OK);
 517 }
 518
 519 /*******************************************************************************
 520  *
 521  * FUNCTION:    acpi_ns_externalize_name
 522  *
 523  * PARAMETERS:  internal_name_length - Lenth of the internal name below
 524  *              internal_name       - Internal representation of name
 525  *              converted_name_length - Where the length is returned
 526  *              converted_name      - Where the resulting external name
 527  *                                    is returned
 528  *
 529  * RETURN:      Status
 530  *
 531  * DESCRIPTION: Convert internal name (e.g. 5c 2f 02 5f 50 52 5f 43 50 55 30)
 532  *              to its external (printable) form (e.g. "\_PR_.CPU0")
 533  *
 534  ******************************************************************************/
 535
 536 acpi_status
 537 acpi_ns_externalize_name(u32 internal_name_length,
 538                          const char *internal_name,
 539                          u32 * converted_name_length, char **converted_name)
 540 {
 541         u32 names_index = 0;
 542         u32 num_segments = 0;
 543         u32 required_length;
 544         u32 prefix_length = 0;
 545         u32 i = 0;
 546         u32 j = 0;
 547
 548         ACPI_FUNCTION_TRACE(ns_externalize_name);
 549
 550         if (!internal_name_length || !internal_name || !converted_name) {
 551                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 552         }
 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         /*
 640          * Build converted_name
 641          */
 642         *converted_name = ACPI_ALLOCATE_ZEROED(required_length);
 643         if (!(*converted_name)) {
 644                 return_ACPI_STATUS(AE_NO_MEMORY);
 645         }
 646
 647         j = 0;
 648
 649         for (i = 0; i < prefix_length; i++) {
 650                 (*converted_name)[j++] = internal_name[i];
 651         }
 652
 653         if (num_segments > 0) {
 654                 for (i = 0; i < num_segments; i++) {
 655                         if (i > 0) {
 656                                 (*converted_name)[j++] = '.';
 657                         }
 658
 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                         (*converted_name)[j++] = internal_name[names_index++];
 663                 }
 664         }
 665
 666         if (converted_name_length) {
 667                 *converted_name_length = (u32) required_length;
 668         }
 669
 670         return_ACPI_STATUS(AE_OK);
 671 }
 672
 673 /*******************************************************************************
 674  *
 675  * FUNCTION:    acpi_ns_map_handle_to_node
 676  *
 677  * PARAMETERS:  Handle          - Handle to be converted to an Node
 678  *
 679  * RETURN:      A Name table entry pointer
 680  *
 681  * DESCRIPTION: Convert a namespace handle to a real Node
 682  *
 683  * Note: Real integer handles would allow for more verification
 684  *       and keep all pointers within this subsystem - however this introduces
 685  *       more (and perhaps unnecessary) overhead.
 686  *
 687  ******************************************************************************/
 688
 689 struct acpi_namespace_node *acpi_ns_map_handle_to_node(acpi_handle handle)
 690 {
 691
 692         ACPI_FUNCTION_ENTRY();
 693
 694         /*
 695          * Simple implementation
 696          */
 697         if ((!handle) || (handle == ACPI_ROOT_OBJECT)) {
 698                 return (acpi_gbl_root_node);
 699         }
 700
 701         /* We can at least attempt to verify the handle */
 702
 703         if (ACPI_GET_DESCRIPTOR_TYPE(handle) != ACPI_DESC_TYPE_NAMED) {
 704                 return (NULL);
 705         }
 706
 707         return (ACPI_CAST_PTR(struct acpi_namespace_node, handle));
 708 }
 709
 710 /*******************************************************************************
 711  *
 712  * FUNCTION:    acpi_ns_convert_entry_to_handle
 713  *
 714  * PARAMETERS:  Node          - Node to be converted to a Handle
 715  *
 716  * RETURN:      A user handle
 717  *
 718  * DESCRIPTION: Convert a real Node to a namespace handle
 719  *
 720  ******************************************************************************/
 721
 722 acpi_handle acpi_ns_convert_entry_to_handle(struct acpi_namespace_node *node)
 723 {
 724
 725         /*
 726          * Simple implementation for now;
 727          */
 728         return ((acpi_handle) node);
 729
 730 /* Example future implementation ---------------------
 731
 732         if (!Node)
 733         {
 734                 return (NULL);
 735         }
 736
 737         if (Node == acpi_gbl_root_node)
 738         {
 739                 return (ACPI_ROOT_OBJECT);
 740         }
 741
 742         return ((acpi_handle) Node);
 743 ------------------------------------------------------*/
 744 }
 745
 746 /*******************************************************************************
 747  *
 748  * FUNCTION:    acpi_ns_terminate
 749  *
 750  * PARAMETERS:  none
 751  *
 752  * RETURN:      none
 753  *
 754  * DESCRIPTION: free memory allocated for namespace and ACPI table storage.
 755  *
 756  ******************************************************************************/
 757
 758 void acpi_ns_terminate(void)
 759 {
 760         union acpi_operand_object *obj_desc;
 761
 762         ACPI_FUNCTION_TRACE(ns_terminate);
 763
 764         /*
 765          * 1) Free the entire namespace -- all nodes and objects
 766          *
 767          * Delete all object descriptors attached to namepsace nodes
 768          */
 769         acpi_ns_delete_namespace_subtree(acpi_gbl_root_node);
 770
 771         /* Detach any objects attached to the root */
 772
 773         obj_desc = acpi_ns_get_attached_object(acpi_gbl_root_node);
 774         if (obj_desc) {
 775                 acpi_ns_detach_object(acpi_gbl_root_node);
 776         }
 777
 778         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Namespace freed\n"));
 779         return_VOID;
 780 }
 781
 782 /*******************************************************************************
 783  *
 784  * FUNCTION:    acpi_ns_opens_scope
 785  *
 786  * PARAMETERS:  Type        - A valid namespace type
 787  *
 788  * RETURN:      NEWSCOPE if the passed type "opens a name scope" according
 789  *              to the ACPI specification, else 0
 790  *
 791  ******************************************************************************/
 792
 793 u32 acpi_ns_opens_scope(acpi_object_type type)
 794 {
 795         ACPI_FUNCTION_TRACE_STR(ns_opens_scope, acpi_ut_get_type_name(type));
 796
 797         if (!acpi_ut_valid_object_type(type)) {
 798
 799                 /* type code out of range  */
 800
 801                 ACPI_WARNING((AE_INFO, "Invalid Object Type %X", type));
 802                 return_UINT32(ACPI_NS_NORMAL);
 803         }
 804
 805         return_UINT32(((u32) acpi_gbl_ns_properties[type]) & ACPI_NS_NEWSCOPE);
 806 }
 807
 808 /*******************************************************************************
 809  *
 810  * FUNCTION:    acpi_ns_get_node
 811  *
 812  * PARAMETERS:  *Pathname   - Name to be found, in external (ASL) format. The
 813  *                            \ (backslash) and ^ (carat) prefixes, and the
 814  *                            . (period) to separate segments are supported.
 815  *              prefix_node  - Root of subtree to be searched, or NS_ALL for the
 816  *                            root of the name space.  If Name is fully
 817  *                            qualified (first s8 is '\'), the passed value
 818  *                            of Scope will not be accessed.
 819  *              Flags       - Used to indicate whether to perform upsearch or
 820  *                            not.
 821  *              return_node - Where the Node is returned
 822  *
 823  * DESCRIPTION: Look up a name relative to a given scope and return the
 824  *              corresponding Node.  NOTE: Scope can be null.
 825  *
 826  * MUTEX:       Locks namespace
 827  *
 828  ******************************************************************************/
 829
 830 acpi_status
 831 acpi_ns_get_node(struct acpi_namespace_node *prefix_node,
 832                  const char *pathname,
 833                  u32 flags, struct acpi_namespace_node **return_node)
 834 {
 835         union acpi_generic_state scope_info;
 836         acpi_status status;
 837         char *internal_path;
 838
 839         ACPI_FUNCTION_TRACE_PTR(ns_get_node, pathname);
 840
 841         if (!pathname) {
 842                 *return_node = prefix_node;
 843                 if (!prefix_node) {
 844                         *return_node = acpi_gbl_root_node;
 845                 }
 846                 return_ACPI_STATUS(AE_OK);
 847         }
 848
 849         /* Convert path to internal representation */
 850
 851         status = acpi_ns_internalize_name(pathname, &internal_path);
 852         if (ACPI_FAILURE(status)) {
 853                 return_ACPI_STATUS(status);
 854         }
 855
 856         /* Must lock namespace during lookup */
 857
 858         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
 859         if (ACPI_FAILURE(status)) {
 860                 goto cleanup;
 861         }
 862
 863         /* Setup lookup scope (search starting point) */
 864
 865         scope_info.scope.node = prefix_node;
 866
 867         /* Lookup the name in the namespace */
 868
 869         status = acpi_ns_lookup(&scope_info, internal_path, ACPI_TYPE_ANY,
 870                                 ACPI_IMODE_EXECUTE,
 871                                 (flags | ACPI_NS_DONT_OPEN_SCOPE), NULL,
 872                                 return_node);
 873         if (ACPI_FAILURE(status)) {
 874                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "%s, %s\n",
 875                                   pathname, acpi_format_exception(status)));
 876         }
 877
 878         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 879
 880       cleanup:
 881         ACPI_FREE(internal_path);
 882         return_ACPI_STATUS(status);
 883 }
 884
 885 /*******************************************************************************
 886  *
 887  * FUNCTION:    acpi_ns_get_parent_node
 888  *
 889  * PARAMETERS:  Node       - Current table entry
 890  *
 891  * RETURN:      Parent entry of the given entry
 892  *
 893  * DESCRIPTION: Obtain the parent entry for a given entry in the namespace.
 894  *
 895  ******************************************************************************/
 896
 897 struct acpi_namespace_node *acpi_ns_get_parent_node(struct acpi_namespace_node
 898                                                     *node)
 899 {
 900         ACPI_FUNCTION_ENTRY();
 901
 902         if (!node) {
 903                 return (NULL);
 904         }
 905
 906         /*
 907          * Walk to the end of this peer list. The last entry is marked with a flag
 908          * and the peer pointer is really a pointer back to the parent. This saves
 909          * putting a parent back pointer in each and every named object!
 910          */
 911         while (!(node->flags & ANOBJ_END_OF_PEER_LIST)) {
 912                 node = node->peer;
 913         }
 914
 915         return (node->peer);
 916 }
 917
 918 /*******************************************************************************
 919  *
 920  * FUNCTION:    acpi_ns_get_next_valid_node
 921  *
 922  * PARAMETERS:  Node       - Current table entry
 923  *
 924  * RETURN:      Next valid Node in the linked node list. NULL if no more valid
 925  *              nodes.
 926  *
 927  * DESCRIPTION: Find the next valid node within a name table.
 928  *              Useful for implementing NULL-end-of-list loops.
 929  *
 930  ******************************************************************************/
 931
 932 struct acpi_namespace_node *acpi_ns_get_next_valid_node(struct
 933                                                         acpi_namespace_node
 934                                                         *node)
 935 {
 936
 937         /* If we are at the end of this peer list, return NULL */
 938
 939         if (node->flags & ANOBJ_END_OF_PEER_LIST) {
 940                 return NULL;
 941         }
 942
 943         /* Otherwise just return the next peer */
 944
 945         return (node->peer);
 946 }
 947
 948 #ifdef ACPI_OBSOLETE_FUNCTIONS
 949 /*******************************************************************************
 950  *
 951  * FUNCTION:    acpi_ns_find_parent_name
 952  *
 953  * PARAMETERS:  *child_node            - Named Obj whose name is to be found
 954  *
 955  * RETURN:      The ACPI name
 956  *
 957  * DESCRIPTION: Search for the given obj in its parent scope and return the
 958  *              name segment, or "????" if the parent name can't be found
 959  *              (which "should not happen").
 960  *
 961  ******************************************************************************/
 962
 963 acpi_name acpi_ns_find_parent_name(struct acpi_namespace_node * child_node)
 964 {
 965         struct acpi_namespace_node *parent_node;
 966
 967         ACPI_FUNCTION_TRACE(ns_find_parent_name);
 968
 969         if (child_node) {
 970
 971                 /* Valid entry.  Get the parent Node */
 972
 973                 parent_node = acpi_ns_get_parent_node(child_node);
 974                 if (parent_node) {
 975                         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 976                                           "Parent of %p [%4.4s] is %p [%4.4s]\n",
 977                                           child_node,
 978                                           acpi_ut_get_node_name(child_node),
 979                                           parent_node,
 980                                           acpi_ut_get_node_name(parent_node)));
 981
 982                         if (parent_node->name.integer) {
 983                                 return_VALUE((acpi_name) parent_node->name.
 984                                              integer);
 985                         }
 986                 }
 987
 988                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 989                                   "Unable to find parent of %p (%4.4s)\n",
 990                                   child_node,
 991                                   acpi_ut_get_node_name(child_node)));
 992         }
 993
 994         return_VALUE(ACPI_UNKNOWN_NAME);
 995 }
 996 #endif