git.oblomov.eu Git - linux-2.6/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 - 2005, R. Byron Moore
  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
  46 #include <acpi/acpi.h>
  47 #include <acpi/acnamesp.h>
  48 #include <acpi/amlcode.h>
  49 #include <acpi/actables.h>
  50
  51 #define _COMPONENT          ACPI_NAMESPACE
  52          ACPI_MODULE_NAME    ("nsutils")
  53
  54
  55 /*******************************************************************************
  56  *
  57  * FUNCTION:    acpi_ns_report_error
  58  *
  59  * PARAMETERS:  module_name         - Caller's module name (for error output)
  60  *              line_number         - Caller's line number (for error output)
  61  *              component_id        - Caller's component ID (for error output)
  62  *              Message             - Error message to use on failure
  63  *
  64  * RETURN:      None
  65  *
  66  * DESCRIPTION: Print warning message with full pathname
  67  *
  68  ******************************************************************************/
  69
  70 void
  71 acpi_ns_report_error (
  72         char                            *module_name,
  73         u32                             line_number,
  74         u32                             component_id,
  75         char                            *internal_name,
  76         acpi_status                     lookup_status)
  77 {
  78         acpi_status                     status;
  79         char                            *name = NULL;
  80
  81
  82         acpi_os_printf ("%8s-%04d: *** Error: Looking up ",
  83                 module_name, line_number);
  84
  85         if (lookup_status == AE_BAD_CHARACTER) {
  86                 /* There is a non-ascii character in the name */
  87
  88                 acpi_os_printf ("[0x%4.4X] (NON-ASCII)\n",
  89                         *(ACPI_CAST_PTR (u32, internal_name)));
  90         }
  91         else {
  92                 /* Convert path to external format */
  93
  94                 status = acpi_ns_externalize_name (ACPI_UINT32_MAX,
  95                                  internal_name, NULL, &name);
  96
  97                 /* Print target name */
  98
  99                 if (ACPI_SUCCESS (status)) {
 100                         acpi_os_printf ("[%s]", name);
 101                 }
 102                 else {
 103                         acpi_os_printf ("[COULD NOT EXTERNALIZE NAME]");
 104                 }
 105
 106                 if (name) {
 107                         ACPI_MEM_FREE (name);
 108                 }
 109         }
 110
 111         acpi_os_printf (" in namespace, %s\n",
 112                 acpi_format_exception (lookup_status));
 113 }
 114
 115
 116 /*******************************************************************************
 117  *
 118  * FUNCTION:    acpi_ns_report_method_error
 119  *
 120  * PARAMETERS:  module_name         - Caller's module name (for error output)
 121  *              line_number         - Caller's line number (for error output)
 122  *              component_id        - Caller's component ID (for error output)
 123  *              Message             - Error message to use on failure
 124  *
 125  * RETURN:      None
 126  *
 127  * DESCRIPTION: Print warning message with full pathname
 128  *
 129  ******************************************************************************/
 130
 131 void
 132 acpi_ns_report_method_error (
 133         char                            *module_name,
 134         u32                             line_number,
 135         u32                             component_id,
 136         char                            *message,
 137         struct acpi_namespace_node      *prefix_node,
 138         char                            *path,
 139         acpi_status                     method_status)
 140 {
 141         acpi_status                     status;
 142         struct acpi_namespace_node      *node = prefix_node;
 143
 144
 145         if (path) {
 146                 status = acpi_ns_get_node_by_path (path, prefix_node,
 147                                  ACPI_NS_NO_UPSEARCH, &node);
 148                 if (ACPI_FAILURE (status)) {
 149                         acpi_os_printf ("report_method_error: Could not get node\n");
 150                         return;
 151                 }
 152         }
 153
 154         acpi_os_printf ("%8s-%04d: *** Error: ", module_name, line_number);
 155         acpi_ns_print_node_pathname (node, message);
 156         acpi_os_printf (", %s\n", acpi_format_exception (method_status));
 157 }
 158
 159
 160 /*******************************************************************************
 161  *
 162  * FUNCTION:    acpi_ns_print_node_pathname
 163  *
 164  * PARAMETERS:  Node                - Object
 165  *              Msg                 - Prefix message
 166  *
 167  * DESCRIPTION: Print an object's full namespace pathname
 168  *              Manages allocation/freeing of a pathname buffer
 169  *
 170  ******************************************************************************/
 171
 172 void
 173 acpi_ns_print_node_pathname (
 174         struct acpi_namespace_node      *node,
 175         char                            *msg)
 176 {
 177         struct acpi_buffer              buffer;
 178         acpi_status                     status;
 179
 180
 181         if (!node) {
 182                 acpi_os_printf ("[NULL NAME]");
 183                 return;
 184         }
 185
 186         /* Convert handle to full pathname and print it (with supplied message) */
 187
 188         buffer.length = ACPI_ALLOCATE_LOCAL_BUFFER;
 189
 190         status = acpi_ns_handle_to_pathname (node, &buffer);
 191         if (ACPI_SUCCESS (status)) {
 192                 if (msg) {
 193                         acpi_os_printf ("%s ", msg);
 194                 }
 195
 196                 acpi_os_printf ("[%s] (Node %p)", (char *) buffer.pointer, node);
 197                 ACPI_MEM_FREE (buffer.pointer);
 198         }
 199 }
 200
 201
 202 /*******************************************************************************
 203  *
 204  * FUNCTION:    acpi_ns_valid_root_prefix
 205  *
 206  * PARAMETERS:  Prefix          - Character to be checked
 207  *
 208  * RETURN:      TRUE if a valid prefix
 209  *
 210  * DESCRIPTION: Check if a character is a valid ACPI Root prefix
 211  *
 212  ******************************************************************************/
 213
 214 u8
 215 acpi_ns_valid_root_prefix (
 216         char                            prefix)
 217 {
 218
 219         return ((u8) (prefix == '\\'));
 220 }
 221
 222
 223 /*******************************************************************************
 224  *
 225  * FUNCTION:    acpi_ns_valid_path_separator
 226  *
 227  * PARAMETERS:  Sep              - Character to be checked
 228  *
 229  * RETURN:      TRUE if a valid path separator
 230  *
 231  * DESCRIPTION: Check if a character is a valid ACPI path separator
 232  *
 233  ******************************************************************************/
 234
 235 u8
 236 acpi_ns_valid_path_separator (
 237         char                            sep)
 238 {
 239
 240         return ((u8) (sep == '.'));
 241 }
 242
 243
 244 /*******************************************************************************
 245  *
 246  * FUNCTION:    acpi_ns_get_type
 247  *
 248  * PARAMETERS:  Handle              - Parent Node to be examined
 249  *
 250  * RETURN:      Type field from Node whose handle is passed
 251  *
 252  ******************************************************************************/
 253
 254 acpi_object_type
 255 acpi_ns_get_type (
 256         struct acpi_namespace_node      *node)
 257 {
 258         ACPI_FUNCTION_TRACE ("ns_get_type");
 259
 260
 261         if (!node) {
 262                 ACPI_REPORT_WARNING (("ns_get_type: Null Node input pointer\n"));
 263                 return_VALUE (ACPI_TYPE_ANY);
 264         }
 265
 266         return_VALUE ((acpi_object_type) node->type);
 267 }
 268
 269
 270 /*******************************************************************************
 271  *
 272  * FUNCTION:    acpi_ns_local
 273  *
 274  * PARAMETERS:  Type            - A namespace object type
 275  *
 276  * RETURN:      LOCAL if names must be found locally in objects of the
 277  *              passed type, 0 if enclosing scopes should be searched
 278  *
 279  ******************************************************************************/
 280
 281 u32
 282 acpi_ns_local (
 283         acpi_object_type                type)
 284 {
 285         ACPI_FUNCTION_TRACE ("ns_local");
 286
 287
 288         if (!acpi_ut_valid_object_type (type)) {
 289                 /* Type code out of range  */
 290
 291                 ACPI_REPORT_WARNING (("ns_local: Invalid Object Type\n"));
 292                 return_VALUE (ACPI_NS_NORMAL);
 293         }
 294
 295         return_VALUE ((u32) acpi_gbl_ns_properties[type] & ACPI_NS_LOCAL);
 296 }
 297
 298
 299 /*******************************************************************************
 300  *
 301  * FUNCTION:    acpi_ns_get_internal_name_length
 302  *
 303  * PARAMETERS:  Info            - Info struct initialized with the
 304  *                                external name pointer.
 305  *
 306  * RETURN:      Status
 307  *
 308  * DESCRIPTION: Calculate the length of the internal (AML) namestring
 309  *              corresponding to the external (ASL) namestring.
 310  *
 311  ******************************************************************************/
 312
 313 void
 314 acpi_ns_get_internal_name_length (
 315         struct acpi_namestring_info     *info)
 316 {
 317         char                            *next_external_char;
 318         u32                             i;
 319
 320
 321         ACPI_FUNCTION_ENTRY ();
 322
 323
 324         next_external_char = info->external_name;
 325         info->num_carats = 0;
 326         info->num_segments = 0;
 327         info->fully_qualified = FALSE;
 328
 329         /*
 330          * For the internal name, the required length is 4 bytes per segment, plus
 331          * 1 each for root_prefix, multi_name_prefix_op, segment count, trailing null
 332          * (which is not really needed, but no there's harm in putting it there)
 333          *
 334          * strlen() + 1 covers the first name_seg, which has no path separator
 335          */
 336         if (acpi_ns_valid_root_prefix (next_external_char[0])) {
 337                 info->fully_qualified = TRUE;
 338                 next_external_char++;
 339         }
 340         else {
 341                 /*
 342                  * Handle Carat prefixes
 343                  */
 344                 while (*next_external_char == '^') {
 345                         info->num_carats++;
 346                         next_external_char++;
 347                 }
 348         }
 349
 350         /*
 351          * Determine the number of ACPI name "segments" by counting the number of
 352          * path separators within the string. Start with one segment since the
 353          * segment count is [(# separators) + 1], and zero separators is ok.
 354          */
 355         if (*next_external_char) {
 356                 info->num_segments = 1;
 357                 for (i = 0; next_external_char[i]; i++) {
 358                         if (acpi_ns_valid_path_separator (next_external_char[i])) {
 359                                 info->num_segments++;
 360                         }
 361                 }
 362         }
 363
 364         info->length = (ACPI_NAME_SIZE * info->num_segments) +
 365                           4 + info->num_carats;
 366
 367         info->next_external_char = next_external_char;
 368 }
 369
 370
 371 /*******************************************************************************
 372  *
 373  * FUNCTION:    acpi_ns_build_internal_name
 374  *
 375  * PARAMETERS:  Info            - Info struct fully initialized
 376  *
 377  * RETURN:      Status
 378  *
 379  * DESCRIPTION: Construct the internal (AML) namestring
 380  *              corresponding to the external (ASL) namestring.
 381  *
 382  ******************************************************************************/
 383
 384 acpi_status
 385 acpi_ns_build_internal_name (
 386         struct acpi_namestring_info     *info)
 387 {
 388         u32                             num_segments = info->num_segments;
 389         char                            *internal_name = info->internal_name;
 390         char                            *external_name = info->next_external_char;
 391         char                            *result = NULL;
 392         acpi_native_uint                i;
 393
 394
 395         ACPI_FUNCTION_TRACE ("ns_build_internal_name");
 396
 397
 398         /* Setup the correct prefixes, counts, and pointers */
 399
 400         if (info->fully_qualified) {
 401                 internal_name[0] = '\\';
 402
 403                 if (num_segments <= 1) {
 404                         result = &internal_name[1];
 405                 }
 406                 else if (num_segments == 2) {
 407                         internal_name[1] = AML_DUAL_NAME_PREFIX;
 408                         result = &internal_name[2];
 409                 }
 410                 else {
 411                         internal_name[1] = AML_MULTI_NAME_PREFIX_OP;
 412                         internal_name[2] = (char) num_segments;
 413                         result = &internal_name[3];
 414                 }
 415         }
 416         else {
 417                 /*
 418                  * Not fully qualified.
 419                  * Handle Carats first, then append the name segments
 420                  */
 421                 i = 0;
 422                 if (info->num_carats) {
 423                         for (i = 0; i < info->num_carats; i++) {
 424                                 internal_name[i] = '^';
 425                         }
 426                 }
 427
 428                 if (num_segments <= 1) {
 429                         result = &internal_name[i];
 430                 }
 431                 else if (num_segments == 2) {
 432                         internal_name[i] = AML_DUAL_NAME_PREFIX;
 433                         result = &internal_name[(acpi_native_uint) (i+1)];
 434                 }
 435                 else {
 436                         internal_name[i] = AML_MULTI_NAME_PREFIX_OP;
 437                         internal_name[(acpi_native_uint) (i+1)] = (char) num_segments;
 438                         result = &internal_name[(acpi_native_uint) (i+2)];
 439                 }
 440         }
 441
 442         /* Build the name (minus path separators) */
 443
 444         for (; num_segments; num_segments--) {
 445                 for (i = 0; i < ACPI_NAME_SIZE; i++) {
 446                         if (acpi_ns_valid_path_separator (*external_name) ||
 447                            (*external_name == 0)) {
 448                                 /* Pad the segment with underscore(s) if segment is short */
 449
 450                                 result[i] = '_';
 451                         }
 452                         else {
 453                                 /* Convert the character to uppercase and save it */
 454
 455                                 result[i] = (char) ACPI_TOUPPER ((int) *external_name);
 456                                 external_name++;
 457                         }
 458                 }
 459
 460                 /* Now we must have a path separator, or the pathname is bad */
 461
 462                 if (!acpi_ns_valid_path_separator (*external_name) &&
 463                         (*external_name != 0)) {
 464                         return_ACPI_STATUS (AE_BAD_PARAMETER);
 465                 }
 466
 467                 /* Move on the next segment */
 468
 469                 external_name++;
 470                 result += ACPI_NAME_SIZE;
 471         }
 472
 473         /* Terminate the string */
 474
 475         *result = 0;
 476
 477         if (info->fully_qualified) {
 478                 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Returning [%p] (abs) \"\\%s\"\n",
 479                         internal_name, internal_name));
 480         }
 481         else {
 482                 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Returning [%p] (rel) \"%s\"\n",
 483                         internal_name, internal_name));
 484         }
 485
 486         return_ACPI_STATUS (AE_OK);
 487 }
 488
 489
 490 /*******************************************************************************
 491  *
 492  * FUNCTION:    acpi_ns_internalize_name
 493  *
 494  * PARAMETERS:  *external_name          - External representation of name
 495  *              **Converted Name        - Where to return the resulting
 496  *                                        internal represention of the name
 497  *
 498  * RETURN:      Status
 499  *
 500  * DESCRIPTION: Convert an external representation (e.g. "\_PR_.CPU0")
 501  *              to internal form (e.g. 5c 2f 02 5f 50 52 5f 43 50 55 30)
 502  *
 503  *******************************************************************************/
 504
 505 acpi_status
 506 acpi_ns_internalize_name (
 507         char                            *external_name,
 508         char                            **converted_name)
 509 {
 510         char                            *internal_name;
 511         struct acpi_namestring_info     info;
 512         acpi_status                     status;
 513
 514
 515         ACPI_FUNCTION_TRACE ("ns_internalize_name");
 516
 517
 518         if ((!external_name)     ||
 519                 (*external_name == 0) ||
 520                 (!converted_name)) {
 521                 return_ACPI_STATUS (AE_BAD_PARAMETER);
 522         }
 523
 524         /* Get the length of the new internal name */
 525
 526         info.external_name = external_name;
 527         acpi_ns_get_internal_name_length (&info);
 528
 529         /* We need a segment to store the internal  name */
 530
 531         internal_name = ACPI_MEM_CALLOCATE (info.length);
 532         if (!internal_name) {
 533                 return_ACPI_STATUS (AE_NO_MEMORY);
 534         }
 535
 536         /* Build the name */
 537
 538         info.internal_name = internal_name;
 539         status = acpi_ns_build_internal_name (&info);
 540         if (ACPI_FAILURE (status)) {
 541                 ACPI_MEM_FREE (internal_name);
 542                 return_ACPI_STATUS (status);
 543         }
 544
 545         *converted_name = internal_name;
 546         return_ACPI_STATUS (AE_OK);
 547 }
 548
 549
 550 /*******************************************************************************
 551  *
 552  * FUNCTION:    acpi_ns_externalize_name
 553  *
 554  * PARAMETERS:  *internal_name         - Internal representation of name
 555  *              **converted_name       - Where to return the resulting
 556  *                                       external representation of name
 557  *
 558  * RETURN:      Status
 559  *
 560  * DESCRIPTION: Convert internal name (e.g. 5c 2f 02 5f 50 52 5f 43 50 55 30)
 561  *              to its external form (e.g. "\_PR_.CPU0")
 562  *
 563  ******************************************************************************/
 564
 565 acpi_status
 566 acpi_ns_externalize_name (
 567         u32                             internal_name_length,
 568         char                            *internal_name,
 569         u32                             *converted_name_length,
 570         char                            **converted_name)
 571 {
 572         acpi_native_uint                names_index = 0;
 573         acpi_native_uint                num_segments = 0;
 574         acpi_native_uint                required_length;
 575         acpi_native_uint                prefix_length = 0;
 576         acpi_native_uint                i = 0;
 577         acpi_native_uint                j = 0;
 578
 579
 580         ACPI_FUNCTION_TRACE ("ns_externalize_name");
 581
 582
 583         if (!internal_name_length   ||
 584                 !internal_name          ||
 585                 !converted_name) {
 586                 return_ACPI_STATUS (AE_BAD_PARAMETER);
 587         }
 588
 589         /*
 590          * Check for a prefix (one '\' | one or more '^').
 591          */
 592         switch (internal_name[0]) {
 593         case '\\':
 594                 prefix_length = 1;
 595                 break;
 596
 597         case '^':
 598                 for (i = 0; i < internal_name_length; i++) {
 599                         if (internal_name[i] == '^') {
 600                                 prefix_length = i + 1;
 601                         }
 602                         else {
 603                                 break;
 604                         }
 605                 }
 606
 607                 if (i == internal_name_length) {
 608                         prefix_length = i;
 609                 }
 610
 611                 break;
 612
 613         default:
 614                 break;
 615         }
 616
 617         /*
 618          * Check for object names.  Note that there could be 0-255 of these
 619          * 4-byte elements.
 620          */
 621         if (prefix_length < internal_name_length) {
 622                 switch (internal_name[prefix_length]) {
 623                 case AML_MULTI_NAME_PREFIX_OP:
 624
 625                         /* <count> 4-byte names */
 626
 627                         names_index = prefix_length + 2;
 628                         num_segments = (acpi_native_uint) (u8)
 629                                            internal_name[(acpi_native_uint) (prefix_length + 1)];
 630                         break;
 631
 632                 case AML_DUAL_NAME_PREFIX:
 633
 634                         /* Two 4-byte names */
 635
 636                         names_index = prefix_length + 1;
 637                         num_segments = 2;
 638                         break;
 639
 640                 case 0:
 641
 642                         /* null_name */
 643
 644                         names_index = 0;
 645                         num_segments = 0;
 646                         break;
 647
 648                 default:
 649
 650                         /* one 4-byte name */
 651
 652                         names_index = prefix_length;
 653                         num_segments = 1;
 654                         break;
 655                 }
 656         }
 657
 658         /*
 659          * Calculate the length of converted_name, which equals the length
 660          * of the prefix, length of all object names, length of any required
 661          * punctuation ('.') between object names, plus the NULL terminator.
 662          */
 663         required_length = prefix_length + (4 * num_segments) +
 664                            ((num_segments > 0) ? (num_segments - 1) : 0) + 1;
 665
 666         /*
 667          * Check to see if we're still in bounds.  If not, there's a problem
 668          * with internal_name (invalid format).
 669          */
 670         if (required_length > internal_name_length) {
 671                 ACPI_REPORT_ERROR (("ns_externalize_name: Invalid internal name\n"));
 672                 return_ACPI_STATUS (AE_BAD_PATHNAME);
 673         }
 674
 675         /*
 676          * Build converted_name
 677          */
 678         *converted_name = ACPI_MEM_CALLOCATE (required_length);
 679         if (!(*converted_name)) {
 680                 return_ACPI_STATUS (AE_NO_MEMORY);
 681         }
 682
 683         j = 0;
 684
 685         for (i = 0; i < prefix_length; i++) {
 686                 (*converted_name)[j++] = internal_name[i];
 687         }
 688
 689         if (num_segments > 0) {
 690                 for (i = 0; i < num_segments; i++) {
 691                         if (i > 0) {
 692                                 (*converted_name)[j++] = '.';
 693                         }
 694
 695                         (*converted_name)[j++] = internal_name[names_index++];
 696                         (*converted_name)[j++] = internal_name[names_index++];
 697                         (*converted_name)[j++] = internal_name[names_index++];
 698                         (*converted_name)[j++] = internal_name[names_index++];
 699                 }
 700         }
 701
 702         if (converted_name_length) {
 703                 *converted_name_length = (u32) required_length;
 704         }
 705
 706         return_ACPI_STATUS (AE_OK);
 707 }
 708
 709
 710 /*******************************************************************************
 711  *
 712  * FUNCTION:    acpi_ns_map_handle_to_node
 713  *
 714  * PARAMETERS:  Handle          - Handle to be converted to an Node
 715  *
 716  * RETURN:      A Name table entry pointer
 717  *
 718  * DESCRIPTION: Convert a namespace handle to a real Node
 719  *
 720  * Note: Real integer handles allow for more verification
 721  *       and keep all pointers within this subsystem.
 722  *
 723  ******************************************************************************/
 724
 725 struct acpi_namespace_node *
 726 acpi_ns_map_handle_to_node (
 727         acpi_handle                     handle)
 728 {
 729
 730         ACPI_FUNCTION_ENTRY ();
 731
 732
 733         /*
 734          * Simple implementation.
 735          */
 736         if (!handle) {
 737                 return (NULL);
 738         }
 739
 740         if (handle == ACPI_ROOT_OBJECT) {
 741                 return (acpi_gbl_root_node);
 742         }
 743
 744         /* We can at least attempt to verify the handle */
 745
 746         if (ACPI_GET_DESCRIPTOR_TYPE (handle) != ACPI_DESC_TYPE_NAMED) {
 747                 return (NULL);
 748         }
 749
 750         return ((struct acpi_namespace_node *) handle);
 751 }
 752
 753
 754 /*******************************************************************************
 755  *
 756  * FUNCTION:    acpi_ns_convert_entry_to_handle
 757  *
 758  * PARAMETERS:  Node          - Node to be converted to a Handle
 759  *
 760  * RETURN:      A user handle
 761  *
 762  * DESCRIPTION: Convert a real Node to a namespace handle
 763  *
 764  ******************************************************************************/
 765
 766 acpi_handle
 767 acpi_ns_convert_entry_to_handle (
 768         struct acpi_namespace_node          *node)
 769 {
 770
 771
 772         /*
 773          * Simple implementation for now;
 774          */
 775         return ((acpi_handle) node);
 776
 777
 778 /* ---------------------------------------------------
 779
 780         if (!Node)
 781         {
 782                 return (NULL);
 783         }
 784
 785         if (Node == acpi_gbl_root_node)
 786         {
 787                 return (ACPI_ROOT_OBJECT);
 788         }
 789
 790
 791         return ((acpi_handle) Node);
 792 ------------------------------------------------------*/
 793 }
 794
 795
 796 /*******************************************************************************
 797  *
 798  * FUNCTION:    acpi_ns_terminate
 799  *
 800  * PARAMETERS:  none
 801  *
 802  * RETURN:      none
 803  *
 804  * DESCRIPTION: free memory allocated for table storage.
 805  *
 806  ******************************************************************************/
 807
 808 void
 809 acpi_ns_terminate (void)
 810 {
 811         union acpi_operand_object       *obj_desc;
 812
 813
 814         ACPI_FUNCTION_TRACE ("ns_terminate");
 815
 816
 817         /*
 818          * 1) Free the entire namespace -- all nodes and objects
 819          *
 820          * Delete all object descriptors attached to namepsace nodes
 821          */
 822         acpi_ns_delete_namespace_subtree (acpi_gbl_root_node);
 823
 824         /* Detach any objects attached to the root */
 825
 826         obj_desc = acpi_ns_get_attached_object (acpi_gbl_root_node);
 827         if (obj_desc) {
 828                 acpi_ns_detach_object (acpi_gbl_root_node);
 829         }
 830
 831         ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Namespace freed\n"));
 832
 833         /*
 834          * 2) Now we can delete the ACPI tables
 835          */
 836         acpi_tb_delete_all_tables ();
 837         ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "ACPI Tables freed\n"));
 838
 839         return_VOID;
 840 }
 841
 842
 843 /*******************************************************************************
 844  *
 845  * FUNCTION:    acpi_ns_opens_scope
 846  *
 847  * PARAMETERS:  Type        - A valid namespace type
 848  *
 849  * RETURN:      NEWSCOPE if the passed type "opens a name scope" according
 850  *              to the ACPI specification, else 0
 851  *
 852  ******************************************************************************/
 853
 854 u32
 855 acpi_ns_opens_scope (
 856         acpi_object_type                type)
 857 {
 858         ACPI_FUNCTION_TRACE_STR ("ns_opens_scope", acpi_ut_get_type_name (type));
 859
 860
 861         if (!acpi_ut_valid_object_type (type)) {
 862                 /* type code out of range  */
 863
 864                 ACPI_REPORT_WARNING (("ns_opens_scope: Invalid Object Type %X\n", type));
 865                 return_VALUE (ACPI_NS_NORMAL);
 866         }
 867
 868         return_VALUE (((u32) acpi_gbl_ns_properties[type]) & ACPI_NS_NEWSCOPE);
 869 }
 870
 871
 872 /*******************************************************************************
 873  *
 874  * FUNCTION:    acpi_ns_get_node_by_path
 875  *
 876  * PARAMETERS:  *Pathname   - Name to be found, in external (ASL) format. The
 877  *                            \ (backslash) and ^ (carat) prefixes, and the
 878  *                            . (period) to separate segments are supported.
 879  *              start_node  - Root of subtree to be searched, or NS_ALL for the
 880  *                            root of the name space.  If Name is fully
 881  *                            qualified (first s8 is '\'), the passed value
 882  *                            of Scope will not be accessed.
 883  *              Flags       - Used to indicate whether to perform upsearch or
 884  *                            not.
 885  *              return_node - Where the Node is returned
 886  *
 887  * DESCRIPTION: Look up a name relative to a given scope and return the
 888  *              corresponding Node.  NOTE: Scope can be null.
 889  *
 890  * MUTEX:       Locks namespace
 891  *
 892  ******************************************************************************/
 893
 894 acpi_status
 895 acpi_ns_get_node_by_path (
 896         char                            *pathname,
 897         struct acpi_namespace_node      *start_node,
 898         u32                             flags,
 899         struct acpi_namespace_node      **return_node)
 900 {
 901         union acpi_generic_state        scope_info;
 902         acpi_status                     status;
 903         char                            *internal_path = NULL;
 904
 905
 906         ACPI_FUNCTION_TRACE_PTR ("ns_get_node_by_path", pathname);
 907
 908
 909         if (pathname) {
 910                 /* Convert path to internal representation */
 911
 912                 status = acpi_ns_internalize_name (pathname, &internal_path);
 913                 if (ACPI_FAILURE (status)) {
 914                         return_ACPI_STATUS (status);
 915                 }
 916         }
 917
 918         /* Must lock namespace during lookup */
 919
 920         status = acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE);
 921         if (ACPI_FAILURE (status)) {
 922                 goto cleanup;
 923         }
 924
 925         /* Setup lookup scope (search starting point) */
 926
 927         scope_info.scope.node = start_node;
 928
 929         /* Lookup the name in the namespace */
 930
 931         status = acpi_ns_lookup (&scope_info, internal_path,
 932                          ACPI_TYPE_ANY, ACPI_IMODE_EXECUTE,
 933                          (flags | ACPI_NS_DONT_OPEN_SCOPE),
 934                          NULL, return_node);
 935         if (ACPI_FAILURE (status)) {
 936                 ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "%s, %s\n",
 937                                 internal_path, acpi_format_exception (status)));
 938         }
 939
 940         (void) acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
 941
 942 cleanup:
 943         /* Cleanup */
 944         if (internal_path) {
 945                 ACPI_MEM_FREE (internal_path);
 946         }
 947         return_ACPI_STATUS (status);
 948 }
 949
 950
 951 /*******************************************************************************
 952  *
 953  * FUNCTION:    acpi_ns_find_parent_name
 954  *
 955  * PARAMETERS:  *child_node            - Named Obj whose name is to be found
 956  *
 957  * RETURN:      The ACPI name
 958  *
 959  * DESCRIPTION: Search for the given obj in its parent scope and return the
 960  *              name segment, or "????" if the parent name can't be found
 961  *              (which "should not happen").
 962  *
 963  ******************************************************************************/
 964 #ifdef ACPI_FUTURE_USAGE
 965 acpi_name
 966 acpi_ns_find_parent_name (
 967         struct acpi_namespace_node      *child_node)
 968 {
 969         struct acpi_namespace_node      *parent_node;
 970
 971
 972         ACPI_FUNCTION_TRACE ("ns_find_parent_name");
 973
 974
 975         if (child_node) {
 976                 /* Valid entry.  Get the parent Node */
 977
 978                 parent_node = acpi_ns_get_parent_node (child_node);
 979                 if (parent_node) {
 980                         ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
 981                                 "Parent of %p [%4.4s] is %p [%4.4s]\n",
 982                                 child_node, acpi_ut_get_node_name (child_node),
 983                                 parent_node, acpi_ut_get_node_name (parent_node)));
 984
 985                         if (parent_node->name.integer) {
 986                                 return_VALUE ((acpi_name) parent_node->name.integer);
 987                         }
 988                 }
 989
 990                 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
 991                         "Unable to find parent of %p (%4.4s)\n",
 992                         child_node, acpi_ut_get_node_name (child_node)));
 993         }
 994
 995         return_VALUE (ACPI_UNKNOWN_NAME);
 996 }
 997 #endif
 998
 999
1000 /*******************************************************************************
1001  *
1002  * FUNCTION:    acpi_ns_get_parent_node
1003  *
1004  * PARAMETERS:  Node       - Current table entry
1005  *
1006  * RETURN:      Parent entry of the given entry
1007  *
1008  * DESCRIPTION: Obtain the parent entry for a given entry in the namespace.
1009  *
1010  ******************************************************************************/
1011
1012
1013 struct acpi_namespace_node *
1014 acpi_ns_get_parent_node (
1015         struct acpi_namespace_node      *node)
1016 {
1017         ACPI_FUNCTION_ENTRY ();
1018
1019
1020         if (!node) {
1021                 return (NULL);
1022         }
1023
1024         /*
1025          * Walk to the end of this peer list. The last entry is marked with a flag
1026          * and the peer pointer is really a pointer back to the parent. This saves
1027          * putting a parent back pointer in each and every named object!
1028          */
1029         while (!(node->flags & ANOBJ_END_OF_PEER_LIST)) {
1030                 node = node->peer;
1031         }
1032
1033
1034         return (node->peer);
1035 }
1036
1037
1038 /*******************************************************************************
1039  *
1040  * FUNCTION:    acpi_ns_get_next_valid_node
1041  *
1042  * PARAMETERS:  Node       - Current table entry
1043  *
1044  * RETURN:      Next valid Node in the linked node list. NULL if no more valid
1045  *              nodes.
1046  *
1047  * DESCRIPTION: Find the next valid node within a name table.
1048  *              Useful for implementing NULL-end-of-list loops.
1049  *
1050  ******************************************************************************/
1051
1052
1053 struct acpi_namespace_node *
1054 acpi_ns_get_next_valid_node (
1055         struct acpi_namespace_node      *node)
1056 {
1057
1058         /* If we are at the end of this peer list, return NULL */
1059
1060         if (node->flags & ANOBJ_END_OF_PEER_LIST) {
1061                 return NULL;
1062         }
1063
1064         /* Otherwise just return the next peer */
1065
1066         return (node->peer);
1067 }
1068
1069