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 - 2019, 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 <contrib/dev/acpica/include/acpi.h> 153 #include <contrib/dev/acpica/include/accommon.h> 154 #include <contrib/dev/acpica/include/amlcode.h> 155 #include <contrib/dev/acpica/include/acnamesp.h> 156 #include <contrib/dev/acpica/include/acdispat.h> 157 158 #ifdef ACPI_ASL_COMPILER 159 #include <contrib/dev/acpica/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_OPERAND_OBJECT *ObjDesc; 188 ACPI_STRING Val = NULL; 189 190 191 ACPI_FUNCTION_TRACE (NsRootInitialize); 192 193 194 Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE); 195 if (ACPI_FAILURE (Status)) 196 { 197 return_ACPI_STATUS (Status); 198 } 199 200 /* 201 * The global root ptr is initially NULL, so a non-NULL value indicates 202 * that AcpiNsRootInitialize() has already been called; just return. 203 */ 204 if (AcpiGbl_RootNode) 205 { 206 Status = AE_OK; 207 goto UnlockAndExit; 208 } 209 210 /* 211 * Tell the rest of the subsystem that the root is initialized 212 * (This is OK because the namespace is locked) 213 */ 214 AcpiGbl_RootNode = &AcpiGbl_RootNodeStruct; 215 216 /* Enter the pre-defined names in the name table */ 217 218 ACPI_DEBUG_PRINT ((ACPI_DB_INFO, 219 "Entering predefined entries into namespace\n")); 220 221 for (InitVal = AcpiGbl_PreDefinedNames; InitVal->Name; InitVal++) 222 { 223 /* _OSI is optional for now, will be permanent later */ 224 225 if (!strcmp (InitVal->Name, "_OSI") && !AcpiGbl_CreateOsiMethod) 226 { 227 continue; 228 } 229 230 Status = AcpiNsLookup (NULL, ACPI_CAST_PTR (char, InitVal->Name), 231 InitVal->Type, ACPI_IMODE_LOAD_PASS2, ACPI_NS_NO_UPSEARCH, 232 NULL, &NewNode); 233 if (ACPI_FAILURE (Status)) 234 { 235 ACPI_EXCEPTION ((AE_INFO, Status, 236 "Could not create predefined name %s", 237 InitVal->Name)); 238 continue; 239 } 240 241 /* 242 * Name entered successfully. If entry in PreDefinedNames[] specifies 243 * an initial value, create the initial value. 244 */ 245 if (InitVal->Val) 246 { 247 Status = AcpiOsPredefinedOverride (InitVal, &Val); 248 if (ACPI_FAILURE (Status)) 249 { 250 ACPI_ERROR ((AE_INFO, 251 "Could not override predefined %s", 252 InitVal->Name)); 253 } 254 255 if (!Val) 256 { 257 Val = InitVal->Val; 258 } 259 260 /* 261 * Entry requests an initial value, allocate a 262 * descriptor for it. 263 */ 264 ObjDesc = AcpiUtCreateInternalObject (InitVal->Type); 265 if (!ObjDesc) 266 { 267 Status = AE_NO_MEMORY; 268 goto UnlockAndExit; 269 } 270 271 /* 272 * Convert value string from table entry to 273 * internal representation. Only types actually 274 * used for initial values are implemented here. 275 */ 276 switch (InitVal->Type) 277 { 278 case ACPI_TYPE_METHOD: 279 280 ObjDesc->Method.ParamCount = (UINT8) ACPI_TO_INTEGER (Val); 281 ObjDesc->Common.Flags |= AOPOBJ_DATA_VALID; 282 283 #if defined (ACPI_ASL_COMPILER) 284 285 /* Save the parameter count for the iASL compiler */ 286 287 NewNode->Value = ObjDesc->Method.ParamCount; 288 #else 289 /* Mark this as a very SPECIAL method */ 290 291 ObjDesc->Method.InfoFlags = ACPI_METHOD_INTERNAL_ONLY; 292 ObjDesc->Method.Dispatch.Implementation = AcpiUtOsiImplementation; 293 #endif 294 break; 295 296 case ACPI_TYPE_INTEGER: 297 298 ObjDesc->Integer.Value = ACPI_TO_INTEGER (Val); 299 break; 300 301 case ACPI_TYPE_STRING: 302 303 /* Build an object around the static string */ 304 305 ObjDesc->String.Length = (UINT32) strlen (Val); 306 ObjDesc->String.Pointer = Val; 307 ObjDesc->Common.Flags |= AOPOBJ_STATIC_POINTER; 308 break; 309 310 case ACPI_TYPE_MUTEX: 311 312 ObjDesc->Mutex.Node = NewNode; 313 ObjDesc->Mutex.SyncLevel = (UINT8) (ACPI_TO_INTEGER (Val) - 1); 314 315 /* Create a mutex */ 316 317 Status = AcpiOsCreateMutex (&ObjDesc->Mutex.OsMutex); 318 if (ACPI_FAILURE (Status)) 319 { 320 AcpiUtRemoveReference (ObjDesc); 321 goto UnlockAndExit; 322 } 323 324 /* Special case for ACPI Global Lock */ 325 326 if (strcmp (InitVal->Name, "_GL_") == 0) 327 { 328 AcpiGbl_GlobalLockMutex = ObjDesc; 329 330 /* Create additional counting semaphore for global lock */ 331 332 Status = AcpiOsCreateSemaphore ( 333 1, 0, &AcpiGbl_GlobalLockSemaphore); 334 if (ACPI_FAILURE (Status)) 335 { 336 AcpiUtRemoveReference (ObjDesc); 337 goto UnlockAndExit; 338 } 339 } 340 break; 341 342 default: 343 344 ACPI_ERROR ((AE_INFO, "Unsupported initial type value 0x%X", 345 InitVal->Type)); 346 AcpiUtRemoveReference (ObjDesc); 347 ObjDesc = NULL; 348 continue; 349 } 350 351 /* Store pointer to value descriptor in the Node */ 352 353 Status = AcpiNsAttachObject (NewNode, ObjDesc, 354 ObjDesc->Common.Type); 355 356 /* Remove local reference to the object */ 357 358 AcpiUtRemoveReference (ObjDesc); 359 } 360 } 361 362 363 UnlockAndExit: 364 (void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE); 365 366 /* Save a handle to "_GPE", it is always present */ 367 368 if (ACPI_SUCCESS (Status)) 369 { 370 Status = AcpiNsGetNode (NULL, "\\_GPE", ACPI_NS_NO_UPSEARCH, 371 &AcpiGbl_FadtGpeDevice); 372 } 373 374 return_ACPI_STATUS (Status); 375 } 376 377 378 /******************************************************************************* 379 * 380 * FUNCTION: AcpiNsLookup 381 * 382 * PARAMETERS: ScopeInfo - Current scope info block 383 * Pathname - Search pathname, in internal format 384 * (as represented in the AML stream) 385 * Type - Type associated with name 386 * InterpreterMode - IMODE_LOAD_PASS2 => add name if not found 387 * Flags - Flags describing the search restrictions 388 * WalkState - Current state of the walk 389 * ReturnNode - Where the Node is placed (if found 390 * or created successfully) 391 * 392 * RETURN: Status 393 * 394 * DESCRIPTION: Find or enter the passed name in the name space. 395 * Log an error if name not found in Exec mode. 396 * 397 * MUTEX: Assumes namespace is locked. 398 * 399 ******************************************************************************/ 400 401 ACPI_STATUS 402 AcpiNsLookup ( 403 ACPI_GENERIC_STATE *ScopeInfo, 404 char *Pathname, 405 ACPI_OBJECT_TYPE Type, 406 ACPI_INTERPRETER_MODE InterpreterMode, 407 UINT32 Flags, 408 ACPI_WALK_STATE *WalkState, 409 ACPI_NAMESPACE_NODE **ReturnNode) 410 { 411 ACPI_STATUS Status; 412 char *Path = Pathname; 413 char *ExternalPath; 414 ACPI_NAMESPACE_NODE *PrefixNode; 415 ACPI_NAMESPACE_NODE *CurrentNode = NULL; 416 ACPI_NAMESPACE_NODE *ThisNode = NULL; 417 UINT32 NumSegments; 418 UINT32 NumCarats; 419 ACPI_NAME SimpleName; 420 ACPI_OBJECT_TYPE TypeToCheckFor; 421 ACPI_OBJECT_TYPE ThisSearchType; 422 UINT32 SearchParentFlag = ACPI_NS_SEARCH_PARENT; 423 UINT32 LocalFlags; 424 ACPI_INTERPRETER_MODE LocalInterpreterMode; 425 426 427 ACPI_FUNCTION_TRACE (NsLookup); 428 429 430 if (!ReturnNode) 431 { 432 return_ACPI_STATUS (AE_BAD_PARAMETER); 433 } 434 435 LocalFlags = Flags & 436 ~(ACPI_NS_ERROR_IF_FOUND | ACPI_NS_OVERRIDE_IF_FOUND | 437 ACPI_NS_SEARCH_PARENT); 438 *ReturnNode = ACPI_ENTRY_NOT_FOUND; 439 AcpiGbl_NsLookupCount++; 440 441 if (!AcpiGbl_RootNode) 442 { 443 return_ACPI_STATUS (AE_NO_NAMESPACE); 444 } 445 446 /* Get the prefix scope. A null scope means use the root scope */ 447 448 if ((!ScopeInfo) || 449 (!ScopeInfo->Scope.Node)) 450 { 451 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, 452 "Null scope prefix, using root node (%p)\n", 453 AcpiGbl_RootNode)); 454 455 PrefixNode = AcpiGbl_RootNode; 456 } 457 else 458 { 459 PrefixNode = ScopeInfo->Scope.Node; 460 if (ACPI_GET_DESCRIPTOR_TYPE (PrefixNode) != ACPI_DESC_TYPE_NAMED) 461 { 462 ACPI_ERROR ((AE_INFO, "%p is not a namespace node [%s]", 463 PrefixNode, AcpiUtGetDescriptorName (PrefixNode))); 464 return_ACPI_STATUS (AE_AML_INTERNAL); 465 } 466 467 if (!(Flags & ACPI_NS_PREFIX_IS_SCOPE)) 468 { 469 /* 470 * This node might not be a actual "scope" node (such as a 471 * Device/Method, etc.) It could be a Package or other object 472 * node. Backup up the tree to find the containing scope node. 473 */ 474 while (!AcpiNsOpensScope (PrefixNode->Type) && 475 PrefixNode->Type != ACPI_TYPE_ANY) 476 { 477 PrefixNode = PrefixNode->Parent; 478 } 479 } 480 } 481 482 /* Save type. TBD: may be no longer necessary */ 483 484 TypeToCheckFor = Type; 485 486 /* 487 * Begin examination of the actual pathname 488 */ 489 if (!Pathname) 490 { 491 /* A Null NamePath is allowed and refers to the root */ 492 493 NumSegments = 0; 494 ThisNode = AcpiGbl_RootNode; 495 Path = ""; 496 497 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, 498 "Null Pathname (Zero segments), Flags=%X\n", Flags)); 499 } 500 else 501 { 502 /* 503 * Name pointer is valid (and must be in internal name format) 504 * 505 * Check for scope prefixes: 506 * 507 * As represented in the AML stream, a namepath consists of an 508 * optional scope prefix followed by a name segment part. 509 * 510 * If present, the scope prefix is either a Root Prefix (in 511 * which case the name is fully qualified), or one or more 512 * Parent Prefixes (in which case the name's scope is relative 513 * to the current scope). 514 */ 515 if (*Path == (UINT8) AML_ROOT_PREFIX) 516 { 517 /* Pathname is fully qualified, start from the root */ 518 519 ThisNode = AcpiGbl_RootNode; 520 SearchParentFlag = ACPI_NS_NO_UPSEARCH; 521 522 /* Point to name segment part */ 523 524 Path++; 525 526 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, 527 "Path is absolute from root [%p]\n", ThisNode)); 528 } 529 else 530 { 531 /* Pathname is relative to current scope, start there */ 532 533 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, 534 "Searching relative to prefix scope [%4.4s] (%p)\n", 535 AcpiUtGetNodeName (PrefixNode), PrefixNode)); 536 537 /* 538 * Handle multiple Parent Prefixes (carat) by just getting 539 * the parent node for each prefix instance. 540 */ 541 ThisNode = PrefixNode; 542 NumCarats = 0; 543 while (*Path == (UINT8) AML_PARENT_PREFIX) 544 { 545 /* Name is fully qualified, no search rules apply */ 546 547 SearchParentFlag = ACPI_NS_NO_UPSEARCH; 548 549 /* 550 * Point past this prefix to the name segment 551 * part or the next Parent Prefix 552 */ 553 Path++; 554 555 /* Backup to the parent node */ 556 557 NumCarats++; 558 ThisNode = ThisNode->Parent; 559 if (!ThisNode) 560 { 561 /* 562 * Current scope has no parent scope. Externalize 563 * the internal path for error message. 564 */ 565 Status = AcpiNsExternalizeName (ACPI_UINT32_MAX, Pathname, 566 NULL, &ExternalPath); 567 if (ACPI_SUCCESS (Status)) 568 { 569 ACPI_ERROR ((AE_INFO, 570 "%s: Path has too many parent prefixes (^)", 571 ExternalPath)); 572 573 ACPI_FREE (ExternalPath); 574 } 575 576 return_ACPI_STATUS (AE_NOT_FOUND); 577 } 578 } 579 580 if (SearchParentFlag == ACPI_NS_NO_UPSEARCH) 581 { 582 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, 583 "Search scope is [%4.4s], path has %u carat(s)\n", 584 AcpiUtGetNodeName (ThisNode), NumCarats)); 585 } 586 } 587 588 /* 589 * Determine the number of ACPI name segments in this pathname. 590 * 591 * The segment part consists of either: 592 * - A Null name segment (0) 593 * - A DualNamePrefix followed by two 4-byte name segments 594 * - A MultiNamePrefix followed by a byte indicating the 595 * number of segments and the segments themselves. 596 * - A single 4-byte name segment 597 * 598 * Examine the name prefix opcode, if any, to determine the number of 599 * segments. 600 */ 601 switch (*Path) 602 { 603 case 0: 604 /* 605 * Null name after a root or parent prefixes. We already 606 * have the correct target node and there are no name segments. 607 */ 608 NumSegments = 0; 609 Type = ThisNode->Type; 610 611 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, 612 "Prefix-only Pathname (Zero name segments), Flags=%X\n", 613 Flags)); 614 break; 615 616 case AML_DUAL_NAME_PREFIX: 617 618 /* More than one NameSeg, search rules do not apply */ 619 620 SearchParentFlag = ACPI_NS_NO_UPSEARCH; 621 622 /* Two segments, point to first name segment */ 623 624 NumSegments = 2; 625 Path++; 626 627 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, 628 "Dual Pathname (2 segments, Flags=%X)\n", Flags)); 629 break; 630 631 case AML_MULTI_NAME_PREFIX: 632 633 /* More than one NameSeg, search rules do not apply */ 634 635 SearchParentFlag = ACPI_NS_NO_UPSEARCH; 636 637 /* Extract segment count, point to first name segment */ 638 639 Path++; 640 NumSegments = (UINT32) (UINT8) *Path; 641 Path++; 642 643 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, 644 "Multi Pathname (%u Segments, Flags=%X)\n", 645 NumSegments, Flags)); 646 break; 647 648 default: 649 /* 650 * Not a Null name, no Dual or Multi prefix, hence there is 651 * only one name segment and Pathname is already pointing to it. 652 */ 653 NumSegments = 1; 654 655 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, 656 "Simple Pathname (1 segment, Flags=%X)\n", Flags)); 657 break; 658 } 659 660 ACPI_DEBUG_EXEC (AcpiNsPrintPathname (NumSegments, Path)); 661 } 662 663 664 /* 665 * Search namespace for each segment of the name. Loop through and 666 * verify (or add to the namespace) each name segment. 667 * 668 * The object type is significant only at the last name 669 * segment. (We don't care about the types along the path, only 670 * the type of the final target object.) 671 */ 672 ThisSearchType = ACPI_TYPE_ANY; 673 CurrentNode = ThisNode; 674 675 while (NumSegments && CurrentNode) 676 { 677 NumSegments--; 678 if (!NumSegments) 679 { 680 /* This is the last segment, enable typechecking */ 681 682 ThisSearchType = Type; 683 684 /* 685 * Only allow automatic parent search (search rules) if the caller 686 * requested it AND we have a single, non-fully-qualified NameSeg 687 */ 688 if ((SearchParentFlag != ACPI_NS_NO_UPSEARCH) && 689 (Flags & ACPI_NS_SEARCH_PARENT)) 690 { 691 LocalFlags |= ACPI_NS_SEARCH_PARENT; 692 } 693 694 /* Set error flag according to caller */ 695 696 if (Flags & ACPI_NS_ERROR_IF_FOUND) 697 { 698 LocalFlags |= ACPI_NS_ERROR_IF_FOUND; 699 } 700 701 /* Set override flag according to caller */ 702 703 if (Flags & ACPI_NS_OVERRIDE_IF_FOUND) 704 { 705 LocalFlags |= ACPI_NS_OVERRIDE_IF_FOUND; 706 } 707 } 708 709 /* Handle opcodes that create a new NameSeg via a full NamePath */ 710 711 LocalInterpreterMode = InterpreterMode; 712 if ((Flags & ACPI_NS_PREFIX_MUST_EXIST) && (NumSegments > 0)) 713 { 714 /* Every element of the path must exist (except for the final NameSeg) */ 715 716 LocalInterpreterMode = ACPI_IMODE_EXECUTE; 717 } 718 719 /* Extract one ACPI name from the front of the pathname */ 720 721 ACPI_MOVE_32_TO_32 (&SimpleName, Path); 722 723 /* Try to find the single (4 character) ACPI name */ 724 725 Status = AcpiNsSearchAndEnter (SimpleName, WalkState, CurrentNode, 726 LocalInterpreterMode, ThisSearchType, LocalFlags, &ThisNode); 727 if (ACPI_FAILURE (Status)) 728 { 729 if (Status == AE_NOT_FOUND) 730 { 731 #if !defined ACPI_ASL_COMPILER /* Note: iASL reports this error by itself, not needed here */ 732 if (Flags & ACPI_NS_PREFIX_MUST_EXIST) 733 { 734 AcpiOsPrintf (ACPI_MSG_BIOS_ERROR 735 "Object does not exist: %4.4s\n", &SimpleName); 736 } 737 #endif 738 /* Name not found in ACPI namespace */ 739 740 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, 741 "Name [%4.4s] not found in scope [%4.4s] %p\n", 742 (char *) &SimpleName, (char *) &CurrentNode->Name, 743 CurrentNode)); 744 } 745 746 #ifdef ACPI_EXEC_APP 747 if ((Status == AE_ALREADY_EXISTS) && 748 (ThisNode->Flags & ANOBJ_NODE_EARLY_INIT)) 749 { 750 ThisNode->Flags &= ~ANOBJ_NODE_EARLY_INIT; 751 Status = AE_OK; 752 } 753 #endif 754 755 #ifdef ACPI_ASL_COMPILER 756 /* 757 * If this ACPI name already exists within the namespace as an 758 * external declaration, then mark the external as a conflicting 759 * declaration and proceed to process the current node as if it did 760 * not exist in the namespace. If this node is not processed as 761 * normal, then it could cause improper namespace resolution 762 * by failing to open a new scope. 763 */ 764 if (AcpiGbl_DisasmFlag && 765 (Status == AE_ALREADY_EXISTS) && 766 ((ThisNode->Flags & ANOBJ_IS_EXTERNAL) || 767 (WalkState && WalkState->Opcode == AML_EXTERNAL_OP))) 768 { 769 ThisNode->Flags &= ~ANOBJ_IS_EXTERNAL; 770 ThisNode->Type = (UINT8)ThisSearchType; 771 if (WalkState->Opcode != AML_EXTERNAL_OP) 772 { 773 AcpiDmMarkExternalConflict (ThisNode); 774 } 775 break; 776 } 777 #endif 778 779 *ReturnNode = ThisNode; 780 return_ACPI_STATUS (Status); 781 } 782 783 /* More segments to follow? */ 784 785 if (NumSegments > 0) 786 { 787 /* 788 * If we have an alias to an object that opens a scope (such as a 789 * device or processor), we need to dereference the alias here so 790 * that we can access any children of the original node (via the 791 * remaining segments). 792 */ 793 if (ThisNode->Type == ACPI_TYPE_LOCAL_ALIAS) 794 { 795 if (!ThisNode->Object) 796 { 797 return_ACPI_STATUS (AE_NOT_EXIST); 798 } 799 800 if (AcpiNsOpensScope (((ACPI_NAMESPACE_NODE *) 801 ThisNode->Object)->Type)) 802 { 803 ThisNode = (ACPI_NAMESPACE_NODE *) ThisNode->Object; 804 } 805 } 806 } 807 808 /* Special handling for the last segment (NumSegments == 0) */ 809 810 else 811 { 812 /* 813 * Sanity typecheck of the target object: 814 * 815 * If 1) This is the last segment (NumSegments == 0) 816 * 2) And we are looking for a specific type 817 * (Not checking for TYPE_ANY) 818 * 3) Which is not an alias 819 * 4) Which is not a local type (TYPE_SCOPE) 820 * 5) And the type of target object is known (not TYPE_ANY) 821 * 6) And target object does not match what we are looking for 822 * 823 * Then we have a type mismatch. Just warn and ignore it. 824 */ 825 if ((TypeToCheckFor != ACPI_TYPE_ANY) && 826 (TypeToCheckFor != ACPI_TYPE_LOCAL_ALIAS) && 827 (TypeToCheckFor != ACPI_TYPE_LOCAL_METHOD_ALIAS) && 828 (TypeToCheckFor != ACPI_TYPE_LOCAL_SCOPE) && 829 (ThisNode->Type != ACPI_TYPE_ANY) && 830 (ThisNode->Type != TypeToCheckFor)) 831 { 832 /* Complain about a type mismatch */ 833 834 ACPI_WARNING ((AE_INFO, 835 "NsLookup: Type mismatch on %4.4s (%s), searching for (%s)", 836 ACPI_CAST_PTR (char, &SimpleName), 837 AcpiUtGetTypeName (ThisNode->Type), 838 AcpiUtGetTypeName (TypeToCheckFor))); 839 } 840 841 /* 842 * If this is the last name segment and we are not looking for a 843 * specific type, but the type of found object is known, use that 844 * type to (later) see if it opens a scope. 845 */ 846 if (Type == ACPI_TYPE_ANY) 847 { 848 Type = ThisNode->Type; 849 } 850 } 851 852 /* Point to next name segment and make this node current */ 853 854 Path += ACPI_NAME_SIZE; 855 CurrentNode = ThisNode; 856 } 857 858 /* Always check if we need to open a new scope */ 859 860 if (!(Flags & ACPI_NS_DONT_OPEN_SCOPE) && (WalkState)) 861 { 862 /* 863 * If entry is a type which opens a scope, push the new scope on the 864 * scope stack. 865 */ 866 if (AcpiNsOpensScope (Type)) 867 { 868 Status = AcpiDsScopeStackPush (ThisNode, Type, WalkState); 869 if (ACPI_FAILURE (Status)) 870 { 871 return_ACPI_STATUS (Status); 872 } 873 } 874 } 875 876 #ifdef ACPI_EXEC_APP 877 if (Flags & ACPI_NS_EARLY_INIT) 878 { 879 ThisNode->Flags |= ANOBJ_NODE_EARLY_INIT; 880 } 881 #endif 882 883 *ReturnNode = ThisNode; 884 return_ACPI_STATUS (AE_OK); 885 } 886