1 /******************************************************************************* 2 * 3 * Module Name: nsaccess - Top-level functions for accessing ACPI namespace 4 * 5 ******************************************************************************/ 6 7 /****************************************************************************** 8 * 9 * 1. Copyright Notice 10 * 11 * Some or all of this work - Copyright (c) 1999 - 2021, Intel Corp. 12 * All rights reserved. 13 * 14 * 2. License 15 * 16 * 2.1. This is your license from Intel Corp. under its intellectual property 17 * rights. You may have additional license terms from the party that provided 18 * you this software, covering your right to use that party's intellectual 19 * property rights. 20 * 21 * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a 22 * copy of the source code appearing in this file ("Covered Code") an 23 * irrevocable, perpetual, worldwide license under Intel's copyrights in the 24 * base code distributed originally by Intel ("Original Intel Code") to copy, 25 * make derivatives, distribute, use and display any portion of the Covered 26 * Code in any form, with the right to sublicense such rights; and 27 * 28 * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent 29 * license (with the right to sublicense), under only those claims of Intel 30 * patents that are infringed by the Original Intel Code, to make, use, sell, 31 * offer to sell, and import the Covered Code and derivative works thereof 32 * solely to the minimum extent necessary to exercise the above copyright 33 * license, and in no event shall the patent license extend to any additions 34 * to or modifications of the Original Intel Code. No other license or right 35 * is granted directly or by implication, estoppel or otherwise; 36 * 37 * The above copyright and patent license is granted only if the following 38 * conditions are met: 39 * 40 * 3. Conditions 41 * 42 * 3.1. Redistribution of Source with Rights to Further Distribute Source. 43 * Redistribution of source code of any substantial portion of the Covered 44 * Code or modification with rights to further distribute source must include 45 * the above Copyright Notice, the above License, this list of Conditions, 46 * and the following Disclaimer and Export Compliance provision. In addition, 47 * Licensee must cause all Covered Code to which Licensee contributes to 48 * contain a file documenting the changes Licensee made to create that Covered 49 * Code and the date of any change. Licensee must include in that file the 50 * documentation of any changes made by any predecessor Licensee. Licensee 51 * must include a prominent statement that the modification is derived, 52 * directly or indirectly, from Original Intel Code. 53 * 54 * 3.2. Redistribution of Source with no Rights to Further Distribute Source. 55 * Redistribution of source code of any substantial portion of the Covered 56 * Code or modification without rights to further distribute source must 57 * include the following Disclaimer and Export Compliance provision in the 58 * documentation and/or other materials provided with distribution. In 59 * addition, Licensee may not authorize further sublicense of source of any 60 * portion of the Covered Code, and must include terms to the effect that the 61 * license from Licensee to its licensee is limited to the intellectual 62 * property embodied in the software Licensee provides to its licensee, and 63 * not to intellectual property embodied in modifications its licensee may 64 * make. 65 * 66 * 3.3. Redistribution of Executable. Redistribution in executable form of any 67 * substantial portion of the Covered Code or modification must reproduce the 68 * above Copyright Notice, and the following Disclaimer and Export Compliance 69 * provision in the documentation and/or other materials provided with the 70 * distribution. 71 * 72 * 3.4. Intel retains all right, title, and interest in and to the Original 73 * Intel Code. 74 * 75 * 3.5. Neither the name Intel nor any other trademark owned or controlled by 76 * Intel shall be used in advertising or otherwise to promote the sale, use or 77 * other dealings in products derived from or relating to the Covered Code 78 * without prior written authorization from Intel. 79 * 80 * 4. Disclaimer and Export Compliance 81 * 82 * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED 83 * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE 84 * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE, 85 * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY 86 * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY 87 * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A 88 * PARTICULAR PURPOSE. 89 * 90 * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES 91 * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR 92 * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT, 93 * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY 94 * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL 95 * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS 96 * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY 97 * LIMITED REMEDY. 98 * 99 * 4.3. Licensee shall not export, either directly or indirectly, any of this 100 * software or system incorporating such software without first obtaining any 101 * required license or other approval from the U. S. Department of Commerce or 102 * any other agency or department of the United States Government. In the 103 * event Licensee exports any such software from the United States or 104 * re-exports any such software from a foreign destination, Licensee shall 105 * ensure that the distribution and export/re-export of the software is in 106 * compliance with all laws, regulations, orders, or other restrictions of the 107 * U.S. Export Administration Regulations. Licensee agrees that neither it nor 108 * any of its subsidiaries will export/re-export any technical data, process, 109 * software, or service, directly or indirectly, to any country for which the 110 * United States government or any agency thereof requires an export license, 111 * other governmental approval, or letter of assurance, without first obtaining 112 * such license, approval or letter. 113 * 114 ***************************************************************************** 115 * 116 * Alternatively, you may choose to be licensed under the terms of the 117 * following license: 118 * 119 * Redistribution and use in source and binary forms, with or without 120 * modification, are permitted provided that the following conditions 121 * are met: 122 * 1. Redistributions of source code must retain the above copyright 123 * notice, this list of conditions, and the following disclaimer, 124 * without modification. 125 * 2. Redistributions in binary form must reproduce at minimum a disclaimer 126 * substantially similar to the "NO WARRANTY" disclaimer below 127 * ("Disclaimer") and any redistribution must be conditioned upon 128 * including a substantially similar Disclaimer requirement for further 129 * binary redistribution. 130 * 3. Neither the names of the above-listed copyright holders nor the names 131 * of any contributors may be used to endorse or promote products derived 132 * from this software without specific prior written permission. 133 * 134 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 135 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 136 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 137 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 138 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 139 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 140 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 141 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 142 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 143 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 144 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 145 * 146 * Alternatively, you may choose to be licensed under the terms of the 147 * GNU General Public License ("GPL") version 2 as published by the Free 148 * Software Foundation. 149 * 150 *****************************************************************************/ 151 152 #include "acpi.h" 153 #include "accommon.h" 154 #include "amlcode.h" 155 #include "acnamesp.h" 156 #include "acdispat.h" 157 158 #ifdef ACPI_ASL_COMPILER 159 #include "acdisasm.h" 160 #endif 161 162 #define _COMPONENT ACPI_NAMESPACE 163 ACPI_MODULE_NAME ("nsaccess") 164 165 166 /******************************************************************************* 167 * 168 * FUNCTION: AcpiNsRootInitialize 169 * 170 * PARAMETERS: None 171 * 172 * RETURN: Status 173 * 174 * DESCRIPTION: Allocate and initialize the default root named objects 175 * 176 * MUTEX: Locks namespace for entire execution 177 * 178 ******************************************************************************/ 179 180 ACPI_STATUS 181 AcpiNsRootInitialize ( 182 void) 183 { 184 ACPI_STATUS Status; 185 const ACPI_PREDEFINED_NAMES *InitVal = NULL; 186 ACPI_NAMESPACE_NODE *NewNode; 187 ACPI_NAMESPACE_NODE *PrevNode = NULL; 188 ACPI_OPERAND_OBJECT *ObjDesc; 189 ACPI_STRING Val = NULL; 190 191 192 ACPI_FUNCTION_TRACE (NsRootInitialize); 193 194 195 Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE); 196 if (ACPI_FAILURE (Status)) 197 { 198 return_ACPI_STATUS (Status); 199 } 200 201 /* 202 * The global root ptr is initially NULL, so a non-NULL value indicates 203 * that AcpiNsRootInitialize() has already been called; just return. 204 */ 205 if (AcpiGbl_RootNode) 206 { 207 Status = AE_OK; 208 goto UnlockAndExit; 209 } 210 211 /* 212 * Tell the rest of the subsystem that the root is initialized 213 * (This is OK because the namespace is locked) 214 */ 215 AcpiGbl_RootNode = &AcpiGbl_RootNodeStruct; 216 217 /* Enter the predefined names in the name table */ 218 219 ACPI_DEBUG_PRINT ((ACPI_DB_INFO, 220 "Entering predefined entries into namespace\n")); 221 222 /* 223 * Create the initial (default) namespace. 224 * This namespace looks like something similar to this: 225 * 226 * ACPI Namespace (from Namespace Root): 227 * 0 _GPE Scope 00203160 00 228 * 0 _PR_ Scope 002031D0 00 229 * 0 _SB_ Device 00203240 00 Notify Object: 0020ADD8 230 * 0 _SI_ Scope 002032B0 00 231 * 0 _TZ_ Device 00203320 00 232 * 0 _REV Integer 00203390 00 = 0000000000000002 233 * 0 _OS_ String 00203488 00 Len 14 "Microsoft Windows NT" 234 * 0 _GL_ Mutex 00203580 00 Object 002035F0 235 * 0 _OSI Method 00203678 00 Args 1 Len 0000 Aml 00000000 236 */ 237 for (InitVal = AcpiGbl_PreDefinedNames; InitVal->Name; InitVal++) 238 { 239 Status = AE_OK; 240 241 /* _OSI is optional for now, will be permanent later */ 242 243 if (!strcmp (InitVal->Name, "_OSI") && !AcpiGbl_CreateOsiMethod) 244 { 245 continue; 246 } 247 248 /* 249 * Create, init, and link the new predefined name 250 * Note: No need to use AcpiNsLookup here because all the 251 * predefined names are at the root level. It is much easier to 252 * just create and link the new node(s) here. 253 */ 254 NewNode = AcpiNsCreateNode (*ACPI_CAST_PTR (UINT32, InitVal->Name)); 255 if (!NewNode) 256 { 257 Status = AE_NO_MEMORY; 258 goto UnlockAndExit; 259 } 260 261 NewNode->DescriptorType = ACPI_DESC_TYPE_NAMED; 262 NewNode->Type = InitVal->Type; 263 264 if (!PrevNode) 265 { 266 AcpiGbl_RootNodeStruct.Child = NewNode; 267 } 268 else 269 { 270 PrevNode->Peer = NewNode; 271 } 272 273 NewNode->Parent = &AcpiGbl_RootNodeStruct; 274 PrevNode = NewNode; 275 276 /* 277 * Name entered successfully. If entry in PreDefinedNames[] specifies 278 * an initial value, create the initial value. 279 */ 280 if (InitVal->Val) 281 { 282 Status = AcpiOsPredefinedOverride (InitVal, &Val); 283 if (ACPI_FAILURE (Status)) 284 { 285 ACPI_ERROR ((AE_INFO, 286 "Could not override predefined %s", 287 InitVal->Name)); 288 } 289 290 if (!Val) 291 { 292 Val = InitVal->Val; 293 } 294 295 /* 296 * Entry requests an initial value, allocate a 297 * descriptor for it. 298 */ 299 ObjDesc = AcpiUtCreateInternalObject (InitVal->Type); 300 if (!ObjDesc) 301 { 302 Status = AE_NO_MEMORY; 303 goto UnlockAndExit; 304 } 305 306 /* 307 * Convert value string from table entry to 308 * internal representation. Only types actually 309 * used for initial values are implemented here. 310 */ 311 switch (InitVal->Type) 312 { 313 case ACPI_TYPE_METHOD: 314 315 ObjDesc->Method.ParamCount = (UINT8) ACPI_TO_INTEGER (Val); 316 ObjDesc->Common.Flags |= AOPOBJ_DATA_VALID; 317 318 #if defined (ACPI_ASL_COMPILER) 319 320 /* Save the parameter count for the iASL compiler */ 321 322 NewNode->Value = ObjDesc->Method.ParamCount; 323 #else 324 /* Mark this as a very SPECIAL method (_OSI) */ 325 326 ObjDesc->Method.InfoFlags = ACPI_METHOD_INTERNAL_ONLY; 327 ObjDesc->Method.Dispatch.Implementation = AcpiUtOsiImplementation; 328 #endif 329 break; 330 331 case ACPI_TYPE_INTEGER: 332 333 ObjDesc->Integer.Value = ACPI_TO_INTEGER (Val); 334 break; 335 336 case ACPI_TYPE_STRING: 337 338 /* Build an object around the static string */ 339 340 ObjDesc->String.Length = (UINT32) strlen (Val); 341 ObjDesc->String.Pointer = Val; 342 ObjDesc->Common.Flags |= AOPOBJ_STATIC_POINTER; 343 break; 344 345 case ACPI_TYPE_MUTEX: 346 347 ObjDesc->Mutex.Node = NewNode; 348 ObjDesc->Mutex.SyncLevel = (UINT8) (ACPI_TO_INTEGER (Val) - 1); 349 350 /* Create a mutex */ 351 352 Status = AcpiOsCreateMutex (&ObjDesc->Mutex.OsMutex); 353 if (ACPI_FAILURE (Status)) 354 { 355 AcpiUtRemoveReference (ObjDesc); 356 goto UnlockAndExit; 357 } 358 359 /* Special case for ACPI Global Lock */ 360 361 if (strcmp (InitVal->Name, "_GL_") == 0) 362 { 363 AcpiGbl_GlobalLockMutex = ObjDesc; 364 365 /* Create additional counting semaphore for global lock */ 366 367 Status = AcpiOsCreateSemaphore ( 368 1, 0, &AcpiGbl_GlobalLockSemaphore); 369 if (ACPI_FAILURE (Status)) 370 { 371 AcpiUtRemoveReference (ObjDesc); 372 goto UnlockAndExit; 373 } 374 } 375 break; 376 377 default: 378 379 ACPI_ERROR ((AE_INFO, "Unsupported initial type value 0x%X", 380 InitVal->Type)); 381 AcpiUtRemoveReference (ObjDesc); 382 ObjDesc = NULL; 383 continue; 384 } 385 386 /* Store pointer to value descriptor in the Node */ 387 388 Status = AcpiNsAttachObject (NewNode, ObjDesc, 389 ObjDesc->Common.Type); 390 391 /* Remove local reference to the object */ 392 393 AcpiUtRemoveReference (ObjDesc); 394 } 395 } 396 397 UnlockAndExit: 398 (void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE); 399 400 /* Save a handle to "_GPE", it is always present */ 401 402 if (ACPI_SUCCESS (Status)) 403 { 404 Status = AcpiNsGetNode (NULL, "\\_GPE", ACPI_NS_NO_UPSEARCH, 405 &AcpiGbl_FadtGpeDevice); 406 } 407 408 return_ACPI_STATUS (Status); 409 } 410 411 412 /******************************************************************************* 413 * 414 * FUNCTION: AcpiNsLookup 415 * 416 * PARAMETERS: ScopeInfo - Current scope info block 417 * Pathname - Search pathname, in internal format 418 * (as represented in the AML stream) 419 * Type - Type associated with name 420 * InterpreterMode - IMODE_LOAD_PASS2 => add name if not found 421 * Flags - Flags describing the search restrictions 422 * WalkState - Current state of the walk 423 * ReturnNode - Where the Node is placed (if found 424 * or created successfully) 425 * 426 * RETURN: Status 427 * 428 * DESCRIPTION: Find or enter the passed name in the name space. 429 * Log an error if name not found in Exec mode. 430 * 431 * MUTEX: Assumes namespace is locked. 432 * 433 ******************************************************************************/ 434 435 ACPI_STATUS 436 AcpiNsLookup ( 437 ACPI_GENERIC_STATE *ScopeInfo, 438 char *Pathname, 439 ACPI_OBJECT_TYPE Type, 440 ACPI_INTERPRETER_MODE InterpreterMode, 441 UINT32 Flags, 442 ACPI_WALK_STATE *WalkState, 443 ACPI_NAMESPACE_NODE **ReturnNode) 444 { 445 ACPI_STATUS Status; 446 char *Path = Pathname; 447 char *ExternalPath; 448 ACPI_NAMESPACE_NODE *PrefixNode; 449 ACPI_NAMESPACE_NODE *CurrentNode = NULL; 450 ACPI_NAMESPACE_NODE *ThisNode = NULL; 451 UINT32 NumSegments; 452 UINT32 NumCarats; 453 ACPI_NAME SimpleName; 454 ACPI_OBJECT_TYPE TypeToCheckFor; 455 ACPI_OBJECT_TYPE ThisSearchType; 456 UINT32 SearchParentFlag = ACPI_NS_SEARCH_PARENT; 457 UINT32 LocalFlags; 458 ACPI_INTERPRETER_MODE LocalInterpreterMode; 459 460 461 ACPI_FUNCTION_TRACE (NsLookup); 462 463 464 if (!ReturnNode) 465 { 466 return_ACPI_STATUS (AE_BAD_PARAMETER); 467 } 468 469 LocalFlags = Flags & 470 ~(ACPI_NS_ERROR_IF_FOUND | ACPI_NS_OVERRIDE_IF_FOUND | 471 ACPI_NS_SEARCH_PARENT); 472 *ReturnNode = ACPI_ENTRY_NOT_FOUND; 473 AcpiGbl_NsLookupCount++; 474 475 if (!AcpiGbl_RootNode) 476 { 477 return_ACPI_STATUS (AE_NO_NAMESPACE); 478 } 479 480 /* Get the prefix scope. A null scope means use the root scope */ 481 482 if ((!ScopeInfo) || 483 (!ScopeInfo->Scope.Node)) 484 { 485 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, 486 "Null scope prefix, using root node (%p)\n", 487 AcpiGbl_RootNode)); 488 489 PrefixNode = AcpiGbl_RootNode; 490 } 491 else 492 { 493 PrefixNode = ScopeInfo->Scope.Node; 494 if (ACPI_GET_DESCRIPTOR_TYPE (PrefixNode) != ACPI_DESC_TYPE_NAMED) 495 { 496 ACPI_ERROR ((AE_INFO, "%p is not a namespace node [%s]", 497 PrefixNode, AcpiUtGetDescriptorName (PrefixNode))); 498 return_ACPI_STATUS (AE_AML_INTERNAL); 499 } 500 501 if (!(Flags & ACPI_NS_PREFIX_IS_SCOPE)) 502 { 503 /* 504 * This node might not be a actual "scope" node (such as a 505 * Device/Method, etc.) It could be a Package or other object 506 * node. Backup up the tree to find the containing scope node. 507 */ 508 while (!AcpiNsOpensScope (PrefixNode->Type) && 509 PrefixNode->Type != ACPI_TYPE_ANY) 510 { 511 PrefixNode = PrefixNode->Parent; 512 } 513 } 514 } 515 516 /* Save type. TBD: may be no longer necessary */ 517 518 TypeToCheckFor = Type; 519 520 /* 521 * Begin examination of the actual pathname 522 */ 523 if (!Pathname) 524 { 525 /* A Null NamePath is allowed and refers to the root */ 526 527 NumSegments = 0; 528 ThisNode = AcpiGbl_RootNode; 529 Path = ""; 530 531 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, 532 "Null Pathname (Zero segments), Flags=%X\n", Flags)); 533 } 534 else 535 { 536 /* 537 * Name pointer is valid (and must be in internal name format) 538 * 539 * Check for scope prefixes: 540 * 541 * As represented in the AML stream, a namepath consists of an 542 * optional scope prefix followed by a name segment part. 543 * 544 * If present, the scope prefix is either a Root Prefix (in 545 * which case the name is fully qualified), or one or more 546 * Parent Prefixes (in which case the name's scope is relative 547 * to the current scope). 548 */ 549 if (*Path == (UINT8) AML_ROOT_PREFIX) 550 { 551 /* Pathname is fully qualified, start from the root */ 552 553 ThisNode = AcpiGbl_RootNode; 554 SearchParentFlag = ACPI_NS_NO_UPSEARCH; 555 556 /* Point to name segment part */ 557 558 Path++; 559 560 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, 561 "Path is absolute from root [%p]\n", ThisNode)); 562 } 563 else 564 { 565 /* Pathname is relative to current scope, start there */ 566 567 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, 568 "Searching relative to prefix scope [%4.4s] (%p)\n", 569 AcpiUtGetNodeName (PrefixNode), PrefixNode)); 570 571 /* 572 * Handle multiple Parent Prefixes (carat) by just getting 573 * the parent node for each prefix instance. 574 */ 575 ThisNode = PrefixNode; 576 NumCarats = 0; 577 while (*Path == (UINT8) AML_PARENT_PREFIX) 578 { 579 /* Name is fully qualified, no search rules apply */ 580 581 SearchParentFlag = ACPI_NS_NO_UPSEARCH; 582 583 /* 584 * Point past this prefix to the name segment 585 * part or the next Parent Prefix 586 */ 587 Path++; 588 589 /* Backup to the parent node */ 590 591 NumCarats++; 592 ThisNode = ThisNode->Parent; 593 if (!ThisNode) 594 { 595 /* 596 * Current scope has no parent scope. Externalize 597 * the internal path for error message. 598 */ 599 Status = AcpiNsExternalizeName (ACPI_UINT32_MAX, Pathname, 600 NULL, &ExternalPath); 601 if (ACPI_SUCCESS (Status)) 602 { 603 ACPI_ERROR ((AE_INFO, 604 "%s: Path has too many parent prefixes (^)", 605 ExternalPath)); 606 607 ACPI_FREE (ExternalPath); 608 } 609 610 return_ACPI_STATUS (AE_NOT_FOUND); 611 } 612 } 613 614 if (SearchParentFlag == ACPI_NS_NO_UPSEARCH) 615 { 616 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, 617 "Search scope is [%4.4s], path has %u carat(s)\n", 618 AcpiUtGetNodeName (ThisNode), NumCarats)); 619 } 620 } 621 622 /* 623 * Determine the number of ACPI name segments in this pathname. 624 * 625 * The segment part consists of either: 626 * - A Null name segment (0) 627 * - A DualNamePrefix followed by two 4-byte name segments 628 * - A MultiNamePrefix followed by a byte indicating the 629 * number of segments and the segments themselves. 630 * - A single 4-byte name segment 631 * 632 * Examine the name prefix opcode, if any, to determine the number of 633 * segments. 634 */ 635 switch (*Path) 636 { 637 case 0: 638 /* 639 * Null name after a root or parent prefixes. We already 640 * have the correct target node and there are no name segments. 641 */ 642 NumSegments = 0; 643 Type = ThisNode->Type; 644 645 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, 646 "Prefix-only Pathname (Zero name segments), Flags=%X\n", 647 Flags)); 648 break; 649 650 case AML_DUAL_NAME_PREFIX: 651 652 /* More than one NameSeg, search rules do not apply */ 653 654 SearchParentFlag = ACPI_NS_NO_UPSEARCH; 655 656 /* Two segments, point to first name segment */ 657 658 NumSegments = 2; 659 Path++; 660 661 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, 662 "Dual Pathname (2 segments, Flags=%X)\n", Flags)); 663 break; 664 665 case AML_MULTI_NAME_PREFIX: 666 667 /* More than one NameSeg, search rules do not apply */ 668 669 SearchParentFlag = ACPI_NS_NO_UPSEARCH; 670 671 /* Extract segment count, point to first name segment */ 672 673 Path++; 674 NumSegments = (UINT32) (UINT8) *Path; 675 Path++; 676 677 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, 678 "Multi Pathname (%u Segments, Flags=%X)\n", 679 NumSegments, Flags)); 680 break; 681 682 default: 683 /* 684 * Not a Null name, no Dual or Multi prefix, hence there is 685 * only one name segment and Pathname is already pointing to it. 686 */ 687 NumSegments = 1; 688 689 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, 690 "Simple Pathname (1 segment, Flags=%X)\n", Flags)); 691 break; 692 } 693 694 ACPI_DEBUG_EXEC (AcpiNsPrintPathname (NumSegments, Path)); 695 } 696 697 698 /* 699 * Search namespace for each segment of the name. Loop through and 700 * verify (or add to the namespace) each name segment. 701 * 702 * The object type is significant only at the last name 703 * segment. (We don't care about the types along the path, only 704 * the type of the final target object.) 705 */ 706 ThisSearchType = ACPI_TYPE_ANY; 707 CurrentNode = ThisNode; 708 709 while (NumSegments && CurrentNode) 710 { 711 NumSegments--; 712 if (!NumSegments) 713 { 714 /* This is the last segment, enable typechecking */ 715 716 ThisSearchType = Type; 717 718 /* 719 * Only allow automatic parent search (search rules) if the caller 720 * requested it AND we have a single, non-fully-qualified NameSeg 721 */ 722 if ((SearchParentFlag != ACPI_NS_NO_UPSEARCH) && 723 (Flags & ACPI_NS_SEARCH_PARENT)) 724 { 725 LocalFlags |= ACPI_NS_SEARCH_PARENT; 726 } 727 728 /* Set error flag according to caller */ 729 730 if (Flags & ACPI_NS_ERROR_IF_FOUND) 731 { 732 LocalFlags |= ACPI_NS_ERROR_IF_FOUND; 733 } 734 735 /* Set override flag according to caller */ 736 737 if (Flags & ACPI_NS_OVERRIDE_IF_FOUND) 738 { 739 LocalFlags |= ACPI_NS_OVERRIDE_IF_FOUND; 740 } 741 } 742 743 /* Handle opcodes that create a new NameSeg via a full NamePath */ 744 745 LocalInterpreterMode = InterpreterMode; 746 if ((Flags & ACPI_NS_PREFIX_MUST_EXIST) && (NumSegments > 0)) 747 { 748 /* Every element of the path must exist (except for the final NameSeg) */ 749 750 LocalInterpreterMode = ACPI_IMODE_EXECUTE; 751 } 752 753 /* Extract one ACPI name from the front of the pathname */ 754 755 ACPI_MOVE_32_TO_32 (&SimpleName, Path); 756 757 /* Try to find the single (4 character) ACPI name */ 758 759 Status = AcpiNsSearchAndEnter (SimpleName, WalkState, CurrentNode, 760 LocalInterpreterMode, ThisSearchType, LocalFlags, &ThisNode); 761 if (ACPI_FAILURE (Status)) 762 { 763 if (Status == AE_NOT_FOUND) 764 { 765 #if !defined ACPI_ASL_COMPILER /* Note: iASL reports this error by itself, not needed here */ 766 if (Flags & ACPI_NS_PREFIX_MUST_EXIST) 767 { 768 AcpiOsPrintf (ACPI_MSG_BIOS_ERROR 769 "Object does not exist: %4.4s\n", (char *) &SimpleName); 770 } 771 #endif 772 /* Name not found in ACPI namespace */ 773 774 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, 775 "Name [%4.4s] not found in scope [%4.4s] %p\n", 776 (char *) &SimpleName, (char *) &CurrentNode->Name, 777 CurrentNode)); 778 } 779 780 #ifdef ACPI_EXEC_APP 781 if ((Status == AE_ALREADY_EXISTS) && 782 (ThisNode->Flags & ANOBJ_NODE_EARLY_INIT)) 783 { 784 ThisNode->Flags &= ~ANOBJ_NODE_EARLY_INIT; 785 Status = AE_OK; 786 } 787 #endif 788 789 #ifdef ACPI_ASL_COMPILER 790 /* 791 * If this ACPI name already exists within the namespace as an 792 * external declaration, then mark the external as a conflicting 793 * declaration and proceed to process the current node as if it did 794 * not exist in the namespace. If this node is not processed as 795 * normal, then it could cause improper namespace resolution 796 * by failing to open a new scope. 797 */ 798 if (AcpiGbl_DisasmFlag && 799 (Status == AE_ALREADY_EXISTS) && 800 ((ThisNode->Flags & ANOBJ_IS_EXTERNAL) || 801 (WalkState && WalkState->Opcode == AML_EXTERNAL_OP))) 802 { 803 ThisNode->Flags &= ~ANOBJ_IS_EXTERNAL; 804 ThisNode->Type = (UINT8)ThisSearchType; 805 if (WalkState->Opcode != AML_EXTERNAL_OP) 806 { 807 AcpiDmMarkExternalConflict (ThisNode); 808 } 809 break; 810 } 811 #endif 812 813 *ReturnNode = ThisNode; 814 return_ACPI_STATUS (Status); 815 } 816 817 /* More segments to follow? */ 818 819 if (NumSegments > 0) 820 { 821 /* 822 * If we have an alias to an object that opens a scope (such as a 823 * device or processor), we need to dereference the alias here so 824 * that we can access any children of the original node (via the 825 * remaining segments). 826 */ 827 if (ThisNode->Type == ACPI_TYPE_LOCAL_ALIAS) 828 { 829 if (!ThisNode->Object) 830 { 831 return_ACPI_STATUS (AE_NOT_EXIST); 832 } 833 834 if (AcpiNsOpensScope (((ACPI_NAMESPACE_NODE *) 835 ThisNode->Object)->Type)) 836 { 837 ThisNode = (ACPI_NAMESPACE_NODE *) ThisNode->Object; 838 } 839 } 840 } 841 842 /* Special handling for the last segment (NumSegments == 0) */ 843 844 else 845 { 846 /* 847 * Sanity typecheck of the target object: 848 * 849 * If 1) This is the last segment (NumSegments == 0) 850 * 2) And we are looking for a specific type 851 * (Not checking for TYPE_ANY) 852 * 3) Which is not an alias 853 * 4) Which is not a local type (TYPE_SCOPE) 854 * 5) And the type of target object is known (not TYPE_ANY) 855 * 6) And target object does not match what we are looking for 856 * 857 * Then we have a type mismatch. Just warn and ignore it. 858 */ 859 if ((TypeToCheckFor != ACPI_TYPE_ANY) && 860 (TypeToCheckFor != ACPI_TYPE_LOCAL_ALIAS) && 861 (TypeToCheckFor != ACPI_TYPE_LOCAL_METHOD_ALIAS) && 862 (TypeToCheckFor != ACPI_TYPE_LOCAL_SCOPE) && 863 (ThisNode->Type != ACPI_TYPE_ANY) && 864 (ThisNode->Type != TypeToCheckFor)) 865 { 866 /* Complain about a type mismatch */ 867 868 ACPI_WARNING ((AE_INFO, 869 "NsLookup: Type mismatch on %4.4s (%s), searching for (%s)", 870 ACPI_CAST_PTR (char, &SimpleName), 871 AcpiUtGetTypeName (ThisNode->Type), 872 AcpiUtGetTypeName (TypeToCheckFor))); 873 } 874 875 /* 876 * If this is the last name segment and we are not looking for a 877 * specific type, but the type of found object is known, use that 878 * type to (later) see if it opens a scope. 879 */ 880 if (Type == ACPI_TYPE_ANY) 881 { 882 Type = ThisNode->Type; 883 } 884 } 885 886 /* Point to next name segment and make this node current */ 887 888 Path += ACPI_NAMESEG_SIZE; 889 CurrentNode = ThisNode; 890 } 891 892 /* Always check if we need to open a new scope */ 893 894 if (!(Flags & ACPI_NS_DONT_OPEN_SCOPE) && (WalkState)) 895 { 896 /* 897 * If entry is a type which opens a scope, push the new scope on the 898 * scope stack. 899 */ 900 if (AcpiNsOpensScope (Type)) 901 { 902 Status = AcpiDsScopeStackPush (ThisNode, Type, WalkState); 903 if (ACPI_FAILURE (Status)) 904 { 905 return_ACPI_STATUS (Status); 906 } 907 } 908 } 909 910 #ifdef ACPI_EXEC_APP 911 if (Flags & ACPI_NS_EARLY_INIT) 912 { 913 ThisNode->Flags |= ANOBJ_NODE_EARLY_INIT; 914 } 915 #endif 916 917 *ReturnNode = ThisNode; 918 return_ACPI_STATUS (AE_OK); 919 } 920