| 1 | /******************************************************************************* |
| 2 | * |
| 3 | * Module Name: nsaccess - Top-level functions for accessing ACPI namespace |
| 4 | * |
| 5 | ******************************************************************************/ |
| 6 | |
| 7 | /* |
| 8 | * Copyright (C) 2000 - 2016, Intel Corp. |
| 9 | * All rights reserved. |
| 10 | * |
| 11 | * Redistribution and use in source and binary forms, with or without |
| 12 | * modification, are permitted provided that the following conditions |
| 13 | * are met: |
| 14 | * 1. Redistributions of source code must retain the above copyright |
| 15 | * notice, this list of conditions, and the following disclaimer, |
| 16 | * without modification. |
| 17 | * 2. Redistributions in binary form must reproduce at minimum a disclaimer |
| 18 | * substantially similar to the "NO WARRANTY" disclaimer below |
| 19 | * ("Disclaimer") and any redistribution must be conditioned upon |
| 20 | * including a substantially similar Disclaimer requirement for further |
| 21 | * binary redistribution. |
| 22 | * 3. Neither the names of the above-listed copyright holders nor the names |
| 23 | * of any contributors may be used to endorse or promote products derived |
| 24 | * from this software without specific prior written permission. |
| 25 | * |
| 26 | * Alternatively, this software may be distributed under the terms of the |
| 27 | * GNU General Public License ("GPL") version 2 as published by the Free |
| 28 | * Software Foundation. |
| 29 | * |
| 30 | * NO WARRANTY |
| 31 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 32 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 33 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR |
| 34 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 35 | * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 36 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 37 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 38 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
| 39 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING |
| 40 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| 41 | * POSSIBILITY OF SUCH DAMAGES. |
| 42 | */ |
| 43 | |
| 44 | #include "acpi.h" |
| 45 | #include "accommon.h" |
| 46 | #include "amlcode.h" |
| 47 | #include "acnamesp.h" |
| 48 | #include "acdispat.h" |
| 49 | |
| 50 | |
| 51 | #define _COMPONENT ACPI_NAMESPACE |
| 52 | ACPI_MODULE_NAME ("nsaccess" ) |
| 53 | |
| 54 | |
| 55 | /******************************************************************************* |
| 56 | * |
| 57 | * FUNCTION: AcpiNsRootInitialize |
| 58 | * |
| 59 | * PARAMETERS: None |
| 60 | * |
| 61 | * RETURN: Status |
| 62 | * |
| 63 | * DESCRIPTION: Allocate and initialize the default root named objects |
| 64 | * |
| 65 | * MUTEX: Locks namespace for entire execution |
| 66 | * |
| 67 | ******************************************************************************/ |
| 68 | |
| 69 | ACPI_STATUS |
| 70 | AcpiNsRootInitialize ( |
| 71 | void) |
| 72 | { |
| 73 | ACPI_STATUS Status; |
| 74 | const ACPI_PREDEFINED_NAMES *InitVal = NULL; |
| 75 | ACPI_NAMESPACE_NODE *NewNode; |
| 76 | ACPI_OPERAND_OBJECT *ObjDesc; |
| 77 | ACPI_STRING Val = NULL; |
| 78 | |
| 79 | |
| 80 | ACPI_FUNCTION_TRACE (NsRootInitialize); |
| 81 | |
| 82 | |
| 83 | Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE); |
| 84 | if (ACPI_FAILURE (Status)) |
| 85 | { |
| 86 | return_ACPI_STATUS (Status); |
| 87 | } |
| 88 | |
| 89 | /* |
| 90 | * The global root ptr is initially NULL, so a non-NULL value indicates |
| 91 | * that AcpiNsRootInitialize() has already been called; just return. |
| 92 | */ |
| 93 | if (AcpiGbl_RootNode) |
| 94 | { |
| 95 | Status = AE_OK; |
| 96 | goto UnlockAndExit; |
| 97 | } |
| 98 | |
| 99 | /* |
| 100 | * Tell the rest of the subsystem that the root is initialized |
| 101 | * (This is OK because the namespace is locked) |
| 102 | */ |
| 103 | AcpiGbl_RootNode = &AcpiGbl_RootNodeStruct; |
| 104 | |
| 105 | /* Enter the pre-defined names in the name table */ |
| 106 | |
| 107 | ACPI_DEBUG_PRINT ((ACPI_DB_INFO, |
| 108 | "Entering predefined entries into namespace\n" )); |
| 109 | |
| 110 | for (InitVal = AcpiGbl_PreDefinedNames; InitVal->Name; InitVal++) |
| 111 | { |
| 112 | /* _OSI is optional for now, will be permanent later */ |
| 113 | |
| 114 | if (!strcmp (InitVal->Name, "_OSI" ) && !AcpiGbl_CreateOsiMethod) |
| 115 | { |
| 116 | continue; |
| 117 | } |
| 118 | |
| 119 | Status = AcpiNsLookup (NULL, ACPI_CAST_PTR (char, InitVal->Name), |
| 120 | InitVal->Type, ACPI_IMODE_LOAD_PASS2, ACPI_NS_NO_UPSEARCH, |
| 121 | NULL, &NewNode); |
| 122 | if (ACPI_FAILURE (Status)) |
| 123 | { |
| 124 | ACPI_EXCEPTION ((AE_INFO, Status, |
| 125 | "Could not create predefined name %s" , |
| 126 | InitVal->Name)); |
| 127 | continue; |
| 128 | } |
| 129 | |
| 130 | /* |
| 131 | * Name entered successfully. If entry in PreDefinedNames[] specifies |
| 132 | * an initial value, create the initial value. |
| 133 | */ |
| 134 | if (InitVal->Val) |
| 135 | { |
| 136 | Status = AcpiOsPredefinedOverride (InitVal, &Val); |
| 137 | if (ACPI_FAILURE (Status)) |
| 138 | { |
| 139 | ACPI_ERROR ((AE_INFO, |
| 140 | "Could not override predefined %s" , |
| 141 | InitVal->Name)); |
| 142 | } |
| 143 | |
| 144 | if (!Val) |
| 145 | { |
| 146 | Val = __UNCONST(InitVal->Val); |
| 147 | } |
| 148 | |
| 149 | /* |
| 150 | * Entry requests an initial value, allocate a |
| 151 | * descriptor for it. |
| 152 | */ |
| 153 | ObjDesc = AcpiUtCreateInternalObject (InitVal->Type); |
| 154 | if (!ObjDesc) |
| 155 | { |
| 156 | Status = AE_NO_MEMORY; |
| 157 | goto UnlockAndExit; |
| 158 | } |
| 159 | |
| 160 | /* |
| 161 | * Convert value string from table entry to |
| 162 | * internal representation. Only types actually |
| 163 | * used for initial values are implemented here. |
| 164 | */ |
| 165 | switch (InitVal->Type) |
| 166 | { |
| 167 | case ACPI_TYPE_METHOD: |
| 168 | |
| 169 | ObjDesc->Method.ParamCount = (UINT8) ACPI_TO_INTEGER (Val); |
| 170 | ObjDesc->Common.Flags |= AOPOBJ_DATA_VALID; |
| 171 | |
| 172 | #if defined (ACPI_ASL_COMPILER) |
| 173 | |
| 174 | /* Save the parameter count for the iASL compiler */ |
| 175 | |
| 176 | NewNode->Value = ObjDesc->Method.ParamCount; |
| 177 | #else |
| 178 | /* Mark this as a very SPECIAL method */ |
| 179 | |
| 180 | ObjDesc->Method.InfoFlags = ACPI_METHOD_INTERNAL_ONLY; |
| 181 | ObjDesc->Method.Dispatch.Implementation = AcpiUtOsiImplementation; |
| 182 | #endif |
| 183 | break; |
| 184 | |
| 185 | case ACPI_TYPE_INTEGER: |
| 186 | |
| 187 | ObjDesc->Integer.Value = ACPI_TO_INTEGER (Val); |
| 188 | break; |
| 189 | |
| 190 | case ACPI_TYPE_STRING: |
| 191 | |
| 192 | /* Build an object around the static string */ |
| 193 | |
| 194 | ObjDesc->String.Length = (UINT32) strlen (Val); |
| 195 | ObjDesc->String.Pointer = Val; |
| 196 | ObjDesc->Common.Flags |= AOPOBJ_STATIC_POINTER; |
| 197 | break; |
| 198 | |
| 199 | case ACPI_TYPE_MUTEX: |
| 200 | |
| 201 | ObjDesc->Mutex.Node = NewNode; |
| 202 | ObjDesc->Mutex.SyncLevel = (UINT8) (ACPI_TO_INTEGER (Val) - 1); |
| 203 | |
| 204 | /* Create a mutex */ |
| 205 | |
| 206 | Status = AcpiOsCreateMutex (&ObjDesc->Mutex.OsMutex); |
| 207 | if (ACPI_FAILURE (Status)) |
| 208 | { |
| 209 | AcpiUtRemoveReference (ObjDesc); |
| 210 | goto UnlockAndExit; |
| 211 | } |
| 212 | |
| 213 | /* Special case for ACPI Global Lock */ |
| 214 | |
| 215 | if (strcmp (InitVal->Name, "_GL_" ) == 0) |
| 216 | { |
| 217 | AcpiGbl_GlobalLockMutex = ObjDesc; |
| 218 | |
| 219 | /* Create additional counting semaphore for global lock */ |
| 220 | |
| 221 | Status = AcpiOsCreateSemaphore ( |
| 222 | 1, 0, &AcpiGbl_GlobalLockSemaphore); |
| 223 | if (ACPI_FAILURE (Status)) |
| 224 | { |
| 225 | AcpiUtRemoveReference (ObjDesc); |
| 226 | goto UnlockAndExit; |
| 227 | } |
| 228 | } |
| 229 | break; |
| 230 | |
| 231 | default: |
| 232 | |
| 233 | ACPI_ERROR ((AE_INFO, "Unsupported initial type value 0x%X" , |
| 234 | InitVal->Type)); |
| 235 | AcpiUtRemoveReference (ObjDesc); |
| 236 | ObjDesc = NULL; |
| 237 | continue; |
| 238 | } |
| 239 | |
| 240 | /* Store pointer to value descriptor in the Node */ |
| 241 | |
| 242 | Status = AcpiNsAttachObject (NewNode, ObjDesc, |
| 243 | ObjDesc->Common.Type); |
| 244 | |
| 245 | /* Remove local reference to the object */ |
| 246 | |
| 247 | AcpiUtRemoveReference (ObjDesc); |
| 248 | } |
| 249 | } |
| 250 | |
| 251 | |
| 252 | UnlockAndExit: |
| 253 | (void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE); |
| 254 | |
| 255 | /* Save a handle to "_GPE", it is always present */ |
| 256 | |
| 257 | if (ACPI_SUCCESS (Status)) |
| 258 | { |
| 259 | Status = AcpiNsGetNode (NULL, "\\_GPE" , ACPI_NS_NO_UPSEARCH, |
| 260 | &AcpiGbl_FadtGpeDevice); |
| 261 | } |
| 262 | |
| 263 | return_ACPI_STATUS (Status); |
| 264 | } |
| 265 | |
| 266 | |
| 267 | /******************************************************************************* |
| 268 | * |
| 269 | * FUNCTION: AcpiNsLookup |
| 270 | * |
| 271 | * PARAMETERS: ScopeInfo - Current scope info block |
| 272 | * Pathname - Search pathname, in internal format |
| 273 | * (as represented in the AML stream) |
| 274 | * Type - Type associated with name |
| 275 | * InterpreterMode - IMODE_LOAD_PASS2 => add name if not found |
| 276 | * Flags - Flags describing the search restrictions |
| 277 | * WalkState - Current state of the walk |
| 278 | * ReturnNode - Where the Node is placed (if found |
| 279 | * or created successfully) |
| 280 | * |
| 281 | * RETURN: Status |
| 282 | * |
| 283 | * DESCRIPTION: Find or enter the passed name in the name space. |
| 284 | * Log an error if name not found in Exec mode. |
| 285 | * |
| 286 | * MUTEX: Assumes namespace is locked. |
| 287 | * |
| 288 | ******************************************************************************/ |
| 289 | |
| 290 | ACPI_STATUS |
| 291 | AcpiNsLookup ( |
| 292 | ACPI_GENERIC_STATE *ScopeInfo, |
| 293 | char *Pathname, |
| 294 | ACPI_OBJECT_TYPE Type, |
| 295 | ACPI_INTERPRETER_MODE InterpreterMode, |
| 296 | UINT32 Flags, |
| 297 | ACPI_WALK_STATE *WalkState, |
| 298 | ACPI_NAMESPACE_NODE **ReturnNode) |
| 299 | { |
| 300 | ACPI_STATUS Status; |
| 301 | char *Path = Pathname; |
| 302 | ACPI_NAMESPACE_NODE *PrefixNode; |
| 303 | ACPI_NAMESPACE_NODE *CurrentNode = NULL; |
| 304 | ACPI_NAMESPACE_NODE *ThisNode = NULL; |
| 305 | UINT32 NumSegments; |
| 306 | UINT32 NumCarats; |
| 307 | ACPI_NAME SimpleName; |
| 308 | ACPI_OBJECT_TYPE TypeToCheckFor; |
| 309 | ACPI_OBJECT_TYPE ThisSearchType; |
| 310 | UINT32 SearchParentFlag = ACPI_NS_SEARCH_PARENT; |
| 311 | UINT32 LocalFlags; |
| 312 | |
| 313 | |
| 314 | ACPI_FUNCTION_TRACE (NsLookup); |
| 315 | |
| 316 | |
| 317 | if (!ReturnNode) |
| 318 | { |
| 319 | return_ACPI_STATUS (AE_BAD_PARAMETER); |
| 320 | } |
| 321 | |
| 322 | LocalFlags = Flags & |
| 323 | ~(ACPI_NS_ERROR_IF_FOUND | ACPI_NS_OVERRIDE_IF_FOUND | |
| 324 | ACPI_NS_SEARCH_PARENT); |
| 325 | *ReturnNode = ACPI_ENTRY_NOT_FOUND; |
| 326 | AcpiGbl_NsLookupCount++; |
| 327 | |
| 328 | if (!AcpiGbl_RootNode) |
| 329 | { |
| 330 | return_ACPI_STATUS (AE_NO_NAMESPACE); |
| 331 | } |
| 332 | |
| 333 | /* Get the prefix scope. A null scope means use the root scope */ |
| 334 | |
| 335 | if ((!ScopeInfo) || |
| 336 | (!ScopeInfo->Scope.Node)) |
| 337 | { |
| 338 | ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, |
| 339 | "Null scope prefix, using root node (%p)\n" , |
| 340 | AcpiGbl_RootNode)); |
| 341 | |
| 342 | PrefixNode = AcpiGbl_RootNode; |
| 343 | } |
| 344 | else |
| 345 | { |
| 346 | PrefixNode = ScopeInfo->Scope.Node; |
| 347 | if (ACPI_GET_DESCRIPTOR_TYPE (PrefixNode) != ACPI_DESC_TYPE_NAMED) |
| 348 | { |
| 349 | ACPI_ERROR ((AE_INFO, "%p is not a namespace node [%s]" , |
| 350 | PrefixNode, AcpiUtGetDescriptorName (PrefixNode))); |
| 351 | return_ACPI_STATUS (AE_AML_INTERNAL); |
| 352 | } |
| 353 | |
| 354 | if (!(Flags & ACPI_NS_PREFIX_IS_SCOPE)) |
| 355 | { |
| 356 | /* |
| 357 | * This node might not be a actual "scope" node (such as a |
| 358 | * Device/Method, etc.) It could be a Package or other object |
| 359 | * node. Backup up the tree to find the containing scope node. |
| 360 | */ |
| 361 | while (!AcpiNsOpensScope (PrefixNode->Type) && |
| 362 | PrefixNode->Type != ACPI_TYPE_ANY) |
| 363 | { |
| 364 | PrefixNode = PrefixNode->Parent; |
| 365 | } |
| 366 | } |
| 367 | } |
| 368 | |
| 369 | /* Save type. TBD: may be no longer necessary */ |
| 370 | |
| 371 | TypeToCheckFor = Type; |
| 372 | |
| 373 | /* |
| 374 | * Begin examination of the actual pathname |
| 375 | */ |
| 376 | if (!Pathname) |
| 377 | { |
| 378 | /* A Null NamePath is allowed and refers to the root */ |
| 379 | |
| 380 | NumSegments = 0; |
| 381 | ThisNode = AcpiGbl_RootNode; |
| 382 | Path = __UNCONST("" ); |
| 383 | |
| 384 | ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, |
| 385 | "Null Pathname (Zero segments), Flags=%X\n" , Flags)); |
| 386 | } |
| 387 | else |
| 388 | { |
| 389 | /* |
| 390 | * Name pointer is valid (and must be in internal name format) |
| 391 | * |
| 392 | * Check for scope prefixes: |
| 393 | * |
| 394 | * As represented in the AML stream, a namepath consists of an |
| 395 | * optional scope prefix followed by a name segment part. |
| 396 | * |
| 397 | * If present, the scope prefix is either a Root Prefix (in |
| 398 | * which case the name is fully qualified), or one or more |
| 399 | * Parent Prefixes (in which case the name's scope is relative |
| 400 | * to the current scope). |
| 401 | */ |
| 402 | if (*Path == (UINT8) AML_ROOT_PREFIX) |
| 403 | { |
| 404 | /* Pathname is fully qualified, start from the root */ |
| 405 | |
| 406 | ThisNode = AcpiGbl_RootNode; |
| 407 | SearchParentFlag = ACPI_NS_NO_UPSEARCH; |
| 408 | |
| 409 | /* Point to name segment part */ |
| 410 | |
| 411 | Path++; |
| 412 | |
| 413 | ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, |
| 414 | "Path is absolute from root [%p]\n" , ThisNode)); |
| 415 | } |
| 416 | else |
| 417 | { |
| 418 | /* Pathname is relative to current scope, start there */ |
| 419 | |
| 420 | ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, |
| 421 | "Searching relative to prefix scope [%4.4s] (%p)\n" , |
| 422 | AcpiUtGetNodeName (PrefixNode), PrefixNode)); |
| 423 | |
| 424 | /* |
| 425 | * Handle multiple Parent Prefixes (carat) by just getting |
| 426 | * the parent node for each prefix instance. |
| 427 | */ |
| 428 | ThisNode = PrefixNode; |
| 429 | NumCarats = 0; |
| 430 | while (*Path == (UINT8) AML_PARENT_PREFIX) |
| 431 | { |
| 432 | /* Name is fully qualified, no search rules apply */ |
| 433 | |
| 434 | SearchParentFlag = ACPI_NS_NO_UPSEARCH; |
| 435 | |
| 436 | /* |
| 437 | * Point past this prefix to the name segment |
| 438 | * part or the next Parent Prefix |
| 439 | */ |
| 440 | Path++; |
| 441 | |
| 442 | /* Backup to the parent node */ |
| 443 | |
| 444 | NumCarats++; |
| 445 | ThisNode = ThisNode->Parent; |
| 446 | if (!ThisNode) |
| 447 | { |
| 448 | /* Current scope has no parent scope */ |
| 449 | |
| 450 | ACPI_ERROR ((AE_INFO, |
| 451 | "%s: Path has too many parent prefixes (^) " |
| 452 | "- reached beyond root node" , Pathname)); |
| 453 | return_ACPI_STATUS (AE_NOT_FOUND); |
| 454 | } |
| 455 | } |
| 456 | |
| 457 | if (SearchParentFlag == ACPI_NS_NO_UPSEARCH) |
| 458 | { |
| 459 | ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, |
| 460 | "Search scope is [%4.4s], path has %u carat(s)\n" , |
| 461 | AcpiUtGetNodeName (ThisNode), NumCarats)); |
| 462 | } |
| 463 | } |
| 464 | |
| 465 | /* |
| 466 | * Determine the number of ACPI name segments in this pathname. |
| 467 | * |
| 468 | * The segment part consists of either: |
| 469 | * - A Null name segment (0) |
| 470 | * - A DualNamePrefix followed by two 4-byte name segments |
| 471 | * - A MultiNamePrefix followed by a byte indicating the |
| 472 | * number of segments and the segments themselves. |
| 473 | * - A single 4-byte name segment |
| 474 | * |
| 475 | * Examine the name prefix opcode, if any, to determine the number of |
| 476 | * segments. |
| 477 | */ |
| 478 | switch (*Path) |
| 479 | { |
| 480 | case 0: |
| 481 | /* |
| 482 | * Null name after a root or parent prefixes. We already |
| 483 | * have the correct target node and there are no name segments. |
| 484 | */ |
| 485 | NumSegments = 0; |
| 486 | Type = ThisNode->Type; |
| 487 | |
| 488 | ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, |
| 489 | "Prefix-only Pathname (Zero name segments), Flags=%X\n" , |
| 490 | Flags)); |
| 491 | break; |
| 492 | |
| 493 | case AML_DUAL_NAME_PREFIX: |
| 494 | |
| 495 | /* More than one NameSeg, search rules do not apply */ |
| 496 | |
| 497 | SearchParentFlag = ACPI_NS_NO_UPSEARCH; |
| 498 | |
| 499 | /* Two segments, point to first name segment */ |
| 500 | |
| 501 | NumSegments = 2; |
| 502 | Path++; |
| 503 | |
| 504 | ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, |
| 505 | "Dual Pathname (2 segments, Flags=%X)\n" , Flags)); |
| 506 | break; |
| 507 | |
| 508 | case AML_MULTI_NAME_PREFIX_OP: |
| 509 | |
| 510 | /* More than one NameSeg, search rules do not apply */ |
| 511 | |
| 512 | SearchParentFlag = ACPI_NS_NO_UPSEARCH; |
| 513 | |
| 514 | /* Extract segment count, point to first name segment */ |
| 515 | |
| 516 | Path++; |
| 517 | NumSegments = (UINT32) (UINT8) *Path; |
| 518 | Path++; |
| 519 | |
| 520 | ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, |
| 521 | "Multi Pathname (%u Segments, Flags=%X)\n" , |
| 522 | NumSegments, Flags)); |
| 523 | break; |
| 524 | |
| 525 | default: |
| 526 | /* |
| 527 | * Not a Null name, no Dual or Multi prefix, hence there is |
| 528 | * only one name segment and Pathname is already pointing to it. |
| 529 | */ |
| 530 | NumSegments = 1; |
| 531 | |
| 532 | ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, |
| 533 | "Simple Pathname (1 segment, Flags=%X)\n" , Flags)); |
| 534 | break; |
| 535 | } |
| 536 | |
| 537 | ACPI_DEBUG_EXEC (AcpiNsPrintPathname (NumSegments, Path)); |
| 538 | } |
| 539 | |
| 540 | |
| 541 | /* |
| 542 | * Search namespace for each segment of the name. Loop through and |
| 543 | * verify (or add to the namespace) each name segment. |
| 544 | * |
| 545 | * The object type is significant only at the last name |
| 546 | * segment. (We don't care about the types along the path, only |
| 547 | * the type of the final target object.) |
| 548 | */ |
| 549 | ThisSearchType = ACPI_TYPE_ANY; |
| 550 | CurrentNode = ThisNode; |
| 551 | while (NumSegments && CurrentNode) |
| 552 | { |
| 553 | NumSegments--; |
| 554 | if (!NumSegments) |
| 555 | { |
| 556 | /* This is the last segment, enable typechecking */ |
| 557 | |
| 558 | ThisSearchType = Type; |
| 559 | |
| 560 | /* |
| 561 | * Only allow automatic parent search (search rules) if the caller |
| 562 | * requested it AND we have a single, non-fully-qualified NameSeg |
| 563 | */ |
| 564 | if ((SearchParentFlag != ACPI_NS_NO_UPSEARCH) && |
| 565 | (Flags & ACPI_NS_SEARCH_PARENT)) |
| 566 | { |
| 567 | LocalFlags |= ACPI_NS_SEARCH_PARENT; |
| 568 | } |
| 569 | |
| 570 | /* Set error flag according to caller */ |
| 571 | |
| 572 | if (Flags & ACPI_NS_ERROR_IF_FOUND) |
| 573 | { |
| 574 | LocalFlags |= ACPI_NS_ERROR_IF_FOUND; |
| 575 | } |
| 576 | |
| 577 | /* Set override flag according to caller */ |
| 578 | |
| 579 | if (Flags & ACPI_NS_OVERRIDE_IF_FOUND) |
| 580 | { |
| 581 | LocalFlags |= ACPI_NS_OVERRIDE_IF_FOUND; |
| 582 | } |
| 583 | } |
| 584 | |
| 585 | /* Extract one ACPI name from the front of the pathname */ |
| 586 | |
| 587 | ACPI_MOVE_32_TO_32 (&SimpleName, Path); |
| 588 | |
| 589 | /* Try to find the single (4 character) ACPI name */ |
| 590 | |
| 591 | Status = AcpiNsSearchAndEnter (SimpleName, WalkState, CurrentNode, |
| 592 | InterpreterMode, ThisSearchType, LocalFlags, &ThisNode); |
| 593 | if (ACPI_FAILURE (Status)) |
| 594 | { |
| 595 | if (Status == AE_NOT_FOUND) |
| 596 | { |
| 597 | /* Name not found in ACPI namespace */ |
| 598 | |
| 599 | ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, |
| 600 | "Name [%4.4s] not found in scope [%4.4s] %p\n" , |
| 601 | (char *) &SimpleName, (char *) &CurrentNode->Name, |
| 602 | CurrentNode)); |
| 603 | } |
| 604 | |
| 605 | *ReturnNode = ThisNode; |
| 606 | return_ACPI_STATUS (Status); |
| 607 | } |
| 608 | |
| 609 | /* More segments to follow? */ |
| 610 | |
| 611 | if (NumSegments > 0) |
| 612 | { |
| 613 | /* |
| 614 | * If we have an alias to an object that opens a scope (such as a |
| 615 | * device or processor), we need to dereference the alias here so |
| 616 | * that we can access any children of the original node (via the |
| 617 | * remaining segments). |
| 618 | */ |
| 619 | if (ThisNode->Type == ACPI_TYPE_LOCAL_ALIAS) |
| 620 | { |
| 621 | if (!ThisNode->Object) |
| 622 | { |
| 623 | return_ACPI_STATUS (AE_NOT_EXIST); |
| 624 | } |
| 625 | |
| 626 | if (AcpiNsOpensScope (((ACPI_NAMESPACE_NODE *) |
| 627 | ThisNode->Object)->Type)) |
| 628 | { |
| 629 | ThisNode = (ACPI_NAMESPACE_NODE *) ThisNode->Object; |
| 630 | } |
| 631 | } |
| 632 | } |
| 633 | |
| 634 | /* Special handling for the last segment (NumSegments == 0) */ |
| 635 | |
| 636 | else |
| 637 | { |
| 638 | /* |
| 639 | * Sanity typecheck of the target object: |
| 640 | * |
| 641 | * If 1) This is the last segment (NumSegments == 0) |
| 642 | * 2) And we are looking for a specific type |
| 643 | * (Not checking for TYPE_ANY) |
| 644 | * 3) Which is not an alias |
| 645 | * 4) Which is not a local type (TYPE_SCOPE) |
| 646 | * 5) And the type of target object is known (not TYPE_ANY) |
| 647 | * 6) And target object does not match what we are looking for |
| 648 | * |
| 649 | * Then we have a type mismatch. Just warn and ignore it. |
| 650 | */ |
| 651 | if ((TypeToCheckFor != ACPI_TYPE_ANY) && |
| 652 | (TypeToCheckFor != ACPI_TYPE_LOCAL_ALIAS) && |
| 653 | (TypeToCheckFor != ACPI_TYPE_LOCAL_METHOD_ALIAS) && |
| 654 | (TypeToCheckFor != ACPI_TYPE_LOCAL_SCOPE) && |
| 655 | (ThisNode->Type != ACPI_TYPE_ANY) && |
| 656 | (ThisNode->Type != TypeToCheckFor)) |
| 657 | { |
| 658 | /* Complain about a type mismatch */ |
| 659 | |
| 660 | ACPI_WARNING ((AE_INFO, |
| 661 | "NsLookup: Type mismatch on %4.4s (%s), searching for (%s)" , |
| 662 | ACPI_CAST_PTR (char, &SimpleName), |
| 663 | AcpiUtGetTypeName (ThisNode->Type), |
| 664 | AcpiUtGetTypeName (TypeToCheckFor))); |
| 665 | } |
| 666 | |
| 667 | /* |
| 668 | * If this is the last name segment and we are not looking for a |
| 669 | * specific type, but the type of found object is known, use that |
| 670 | * type to (later) see if it opens a scope. |
| 671 | */ |
| 672 | if (Type == ACPI_TYPE_ANY) |
| 673 | { |
| 674 | Type = ThisNode->Type; |
| 675 | } |
| 676 | } |
| 677 | |
| 678 | /* Point to next name segment and make this node current */ |
| 679 | |
| 680 | Path += ACPI_NAME_SIZE; |
| 681 | CurrentNode = ThisNode; |
| 682 | } |
| 683 | |
| 684 | /* Always check if we need to open a new scope */ |
| 685 | |
| 686 | if (!(Flags & ACPI_NS_DONT_OPEN_SCOPE) && (WalkState)) |
| 687 | { |
| 688 | /* |
| 689 | * If entry is a type which opens a scope, push the new scope on the |
| 690 | * scope stack. |
| 691 | */ |
| 692 | if (AcpiNsOpensScope (Type)) |
| 693 | { |
| 694 | Status = AcpiDsScopeStackPush (ThisNode, Type, WalkState); |
| 695 | if (ACPI_FAILURE (Status)) |
| 696 | { |
| 697 | return_ACPI_STATUS (Status); |
| 698 | } |
| 699 | } |
| 700 | } |
| 701 | |
| 702 | *ReturnNode = ThisNode; |
| 703 | return_ACPI_STATUS (AE_OK); |
| 704 | } |
| 705 | |