1 /******************************************************************************* 2 * 3 * Module Name: nssearch - Namespace search 4 * 5 ******************************************************************************/ 6 7 /****************************************************************************** 8 * 9 * 1. Copyright Notice 10 * 11 * Some or all of this work - Copyright (c) 1999 - 2018, 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 "acnamesp.h" 155 156 #ifdef ACPI_ASL_COMPILER 157 #include "amlcode.h" 158 #endif 159 160 #define _COMPONENT ACPI_NAMESPACE 161 ACPI_MODULE_NAME ("nssearch") 162 163 /* Local prototypes */ 164 165 static ACPI_STATUS 166 AcpiNsSearchParentTree ( 167 UINT32 TargetName, 168 ACPI_NAMESPACE_NODE *Node, 169 ACPI_OBJECT_TYPE Type, 170 ACPI_NAMESPACE_NODE **ReturnNode); 171 172 173 /******************************************************************************* 174 * 175 * FUNCTION: AcpiNsSearchOneScope 176 * 177 * PARAMETERS: TargetName - Ascii ACPI name to search for 178 * ParentNode - Starting node where search will begin 179 * Type - Object type to match 180 * ReturnNode - Where the matched Named obj is returned 181 * 182 * RETURN: Status 183 * 184 * DESCRIPTION: Search a single level of the namespace. Performs a 185 * simple search of the specified level, and does not add 186 * entries or search parents. 187 * 188 * 189 * Named object lists are built (and subsequently dumped) in the 190 * order in which the names are encountered during the namespace load; 191 * 192 * All namespace searching is linear in this implementation, but 193 * could be easily modified to support any improved search 194 * algorithm. However, the linear search was chosen for simplicity 195 * and because the trees are small and the other interpreter 196 * execution overhead is relatively high. 197 * 198 * Note: CPU execution analysis has shown that the AML interpreter spends 199 * a very small percentage of its time searching the namespace. Therefore, 200 * the linear search seems to be sufficient, as there would seem to be 201 * little value in improving the search. 202 * 203 ******************************************************************************/ 204 205 ACPI_STATUS 206 AcpiNsSearchOneScope ( 207 UINT32 TargetName, 208 ACPI_NAMESPACE_NODE *ParentNode, 209 ACPI_OBJECT_TYPE Type, 210 ACPI_NAMESPACE_NODE **ReturnNode) 211 { 212 ACPI_NAMESPACE_NODE *Node; 213 214 215 ACPI_FUNCTION_TRACE (NsSearchOneScope); 216 217 218 #ifdef ACPI_DEBUG_OUTPUT 219 if (ACPI_LV_NAMES & AcpiDbgLevel) 220 { 221 char *ScopeName; 222 223 ScopeName = AcpiNsGetNormalizedPathname (ParentNode, TRUE); 224 if (ScopeName) 225 { 226 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, 227 "Searching %s (%p) For [%4.4s] (%s)\n", 228 ScopeName, ParentNode, ACPI_CAST_PTR (char, &TargetName), 229 AcpiUtGetTypeName (Type))); 230 231 ACPI_FREE (ScopeName); 232 } 233 } 234 #endif 235 236 /* 237 * Search for name at this namespace level, which is to say that we 238 * must search for the name among the children of this object 239 */ 240 Node = ParentNode->Child; 241 while (Node) 242 { 243 /* Check for match against the name */ 244 245 if (Node->Name.Integer == TargetName) 246 { 247 /* Resolve a control method alias if any */ 248 249 if (AcpiNsGetType (Node) == ACPI_TYPE_LOCAL_METHOD_ALIAS) 250 { 251 Node = ACPI_CAST_PTR (ACPI_NAMESPACE_NODE, Node->Object); 252 } 253 254 /* Found matching entry */ 255 256 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, 257 "Name [%4.4s] (%s) %p found in scope [%4.4s] %p\n", 258 ACPI_CAST_PTR (char, &TargetName), 259 AcpiUtGetTypeName (Node->Type), 260 Node, AcpiUtGetNodeName (ParentNode), ParentNode)); 261 262 *ReturnNode = Node; 263 return_ACPI_STATUS (AE_OK); 264 } 265 266 /* Didn't match name, move on to the next peer object */ 267 268 Node = Node->Peer; 269 } 270 271 /* Searched entire namespace level, not found */ 272 273 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, 274 "Name [%4.4s] (%s) not found in search in scope [%4.4s] " 275 "%p first child %p\n", 276 ACPI_CAST_PTR (char, &TargetName), AcpiUtGetTypeName (Type), 277 AcpiUtGetNodeName (ParentNode), ParentNode, ParentNode->Child)); 278 279 return_ACPI_STATUS (AE_NOT_FOUND); 280 } 281 282 283 /******************************************************************************* 284 * 285 * FUNCTION: AcpiNsSearchParentTree 286 * 287 * PARAMETERS: TargetName - Ascii ACPI name to search for 288 * Node - Starting node where search will begin 289 * Type - Object type to match 290 * ReturnNode - Where the matched Node is returned 291 * 292 * RETURN: Status 293 * 294 * DESCRIPTION: Called when a name has not been found in the current namespace 295 * level. Before adding it or giving up, ACPI scope rules require 296 * searching enclosing scopes in cases identified by AcpiNsLocal(). 297 * 298 * "A name is located by finding the matching name in the current 299 * name space, and then in the parent name space. If the parent 300 * name space does not contain the name, the search continues 301 * recursively until either the name is found or the name space 302 * does not have a parent (the root of the name space). This 303 * indicates that the name is not found" (From ACPI Specification, 304 * section 5.3) 305 * 306 ******************************************************************************/ 307 308 static ACPI_STATUS 309 AcpiNsSearchParentTree ( 310 UINT32 TargetName, 311 ACPI_NAMESPACE_NODE *Node, 312 ACPI_OBJECT_TYPE Type, 313 ACPI_NAMESPACE_NODE **ReturnNode) 314 { 315 ACPI_STATUS Status; 316 ACPI_NAMESPACE_NODE *ParentNode; 317 318 319 ACPI_FUNCTION_TRACE (NsSearchParentTree); 320 321 322 ParentNode = Node->Parent; 323 324 /* 325 * If there is no parent (i.e., we are at the root) or type is "local", 326 * we won't be searching the parent tree. 327 */ 328 if (!ParentNode) 329 { 330 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, "[%4.4s] has no parent\n", 331 ACPI_CAST_PTR (char, &TargetName))); 332 return_ACPI_STATUS (AE_NOT_FOUND); 333 } 334 335 if (AcpiNsLocal (Type)) 336 { 337 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, 338 "[%4.4s] type [%s] must be local to this scope (no parent search)\n", 339 ACPI_CAST_PTR (char, &TargetName), AcpiUtGetTypeName (Type))); 340 return_ACPI_STATUS (AE_NOT_FOUND); 341 } 342 343 /* Search the parent tree */ 344 345 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, 346 "Searching parent [%4.4s] for [%4.4s]\n", 347 AcpiUtGetNodeName (ParentNode), ACPI_CAST_PTR (char, &TargetName))); 348 349 /* Search parents until target is found or we have backed up to the root */ 350 351 while (ParentNode) 352 { 353 /* 354 * Search parent scope. Use TYPE_ANY because we don't care about the 355 * object type at this point, we only care about the existence of 356 * the actual name we are searching for. Typechecking comes later. 357 */ 358 Status = AcpiNsSearchOneScope ( 359 TargetName, ParentNode, ACPI_TYPE_ANY, ReturnNode); 360 if (ACPI_SUCCESS (Status)) 361 { 362 return_ACPI_STATUS (Status); 363 } 364 365 /* Not found here, go up another level (until we reach the root) */ 366 367 ParentNode = ParentNode->Parent; 368 } 369 370 /* Not found in parent tree */ 371 372 return_ACPI_STATUS (AE_NOT_FOUND); 373 } 374 375 376 /******************************************************************************* 377 * 378 * FUNCTION: AcpiNsSearchAndEnter 379 * 380 * PARAMETERS: TargetName - Ascii ACPI name to search for (4 chars) 381 * WalkState - Current state of the walk 382 * Node - Starting node where search will begin 383 * InterpreterMode - Add names only in ACPI_MODE_LOAD_PASS_x. 384 * Otherwise,search only. 385 * Type - Object type to match 386 * Flags - Flags describing the search restrictions 387 * ReturnNode - Where the Node is returned 388 * 389 * RETURN: Status 390 * 391 * DESCRIPTION: Search for a name segment in a single namespace level, 392 * optionally adding it if it is not found. If the passed 393 * Type is not Any and the type previously stored in the 394 * entry was Any (i.e. unknown), update the stored type. 395 * 396 * In ACPI_IMODE_EXECUTE, search only. 397 * In other modes, search and add if not found. 398 * 399 ******************************************************************************/ 400 401 ACPI_STATUS 402 AcpiNsSearchAndEnter ( 403 UINT32 TargetName, 404 ACPI_WALK_STATE *WalkState, 405 ACPI_NAMESPACE_NODE *Node, 406 ACPI_INTERPRETER_MODE InterpreterMode, 407 ACPI_OBJECT_TYPE Type, 408 UINT32 Flags, 409 ACPI_NAMESPACE_NODE **ReturnNode) 410 { 411 ACPI_STATUS Status; 412 ACPI_NAMESPACE_NODE *NewNode; 413 414 415 ACPI_FUNCTION_TRACE (NsSearchAndEnter); 416 417 418 /* Parameter validation */ 419 420 if (!Node || !TargetName || !ReturnNode) 421 { 422 ACPI_ERROR ((AE_INFO, 423 "Null parameter: Node %p Name 0x%X ReturnNode %p", 424 Node, TargetName, ReturnNode)); 425 return_ACPI_STATUS (AE_BAD_PARAMETER); 426 } 427 428 /* 429 * Name must consist of valid ACPI characters. We will repair the name if 430 * necessary because we don't want to abort because of this, but we want 431 * all namespace names to be printable. A warning message is appropriate. 432 * 433 * This issue came up because there are in fact machines that exhibit 434 * this problem, and we want to be able to enable ACPI support for them, 435 * even though there are a few bad names. 436 */ 437 AcpiUtRepairName (ACPI_CAST_PTR (char, &TargetName)); 438 439 /* Try to find the name in the namespace level specified by the caller */ 440 441 *ReturnNode = ACPI_ENTRY_NOT_FOUND; 442 Status = AcpiNsSearchOneScope (TargetName, Node, Type, ReturnNode); 443 if (Status != AE_NOT_FOUND) 444 { 445 /* 446 * If we found it AND the request specifies that a find is an error, 447 * return the error 448 */ 449 if (Status == AE_OK) 450 { 451 /* The node was found in the namespace */ 452 453 /* 454 * If the namespace override feature is enabled for this node, 455 * delete any existing attached sub-object and make the node 456 * look like a new node that is owned by the override table. 457 */ 458 if (Flags & ACPI_NS_OVERRIDE_IF_FOUND) 459 { 460 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, 461 "Namespace override: %4.4s pass %u type %X Owner %X\n", 462 ACPI_CAST_PTR(char, &TargetName), InterpreterMode, 463 (*ReturnNode)->Type, WalkState->OwnerId)); 464 465 AcpiNsDeleteChildren (*ReturnNode); 466 if (AcpiGbl_RuntimeNamespaceOverride) 467 { 468 AcpiUtRemoveReference ((*ReturnNode)->Object); 469 (*ReturnNode)->Object = NULL; 470 (*ReturnNode)->OwnerId = WalkState->OwnerId; 471 } 472 else 473 { 474 AcpiNsRemoveNode (*ReturnNode); 475 *ReturnNode = ACPI_ENTRY_NOT_FOUND; 476 } 477 } 478 479 /* Return an error if we don't expect to find the object */ 480 481 else if (Flags & ACPI_NS_ERROR_IF_FOUND) 482 { 483 Status = AE_ALREADY_EXISTS; 484 } 485 } 486 487 #ifdef ACPI_ASL_COMPILER 488 if (*ReturnNode && (*ReturnNode)->Type == ACPI_TYPE_ANY) 489 { 490 (*ReturnNode)->Flags |= ANOBJ_IS_EXTERNAL; 491 } 492 #endif 493 494 /* Either found it or there was an error: finished either way */ 495 496 return_ACPI_STATUS (Status); 497 } 498 499 /* 500 * The name was not found. If we are NOT performing the first pass 501 * (name entry) of loading the namespace, search the parent tree (all the 502 * way to the root if necessary.) We don't want to perform the parent 503 * search when the namespace is actually being loaded. We want to perform 504 * the search when namespace references are being resolved (load pass 2) 505 * and during the execution phase. 506 */ 507 if ((InterpreterMode != ACPI_IMODE_LOAD_PASS1) && 508 (Flags & ACPI_NS_SEARCH_PARENT)) 509 { 510 /* 511 * Not found at this level - search parent tree according to the 512 * ACPI specification 513 */ 514 Status = AcpiNsSearchParentTree (TargetName, Node, Type, ReturnNode); 515 if (ACPI_SUCCESS (Status)) 516 { 517 return_ACPI_STATUS (Status); 518 } 519 } 520 521 /* In execute mode, just search, never add names. Exit now */ 522 523 if (InterpreterMode == ACPI_IMODE_EXECUTE) 524 { 525 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, 526 "%4.4s Not found in %p [Not adding]\n", 527 ACPI_CAST_PTR (char, &TargetName), Node)); 528 529 return_ACPI_STATUS (AE_NOT_FOUND); 530 } 531 532 /* Create the new named object */ 533 534 NewNode = AcpiNsCreateNode (TargetName); 535 if (!NewNode) 536 { 537 return_ACPI_STATUS (AE_NO_MEMORY); 538 } 539 540 #ifdef ACPI_ASL_COMPILER 541 542 /* Node is an object defined by an External() statement */ 543 544 if (Flags & ACPI_NS_EXTERNAL || 545 (WalkState && WalkState->Opcode == AML_SCOPE_OP)) 546 { 547 NewNode->Flags |= ANOBJ_IS_EXTERNAL; 548 } 549 #endif 550 551 if (Flags & ACPI_NS_TEMPORARY) 552 { 553 NewNode->Flags |= ANOBJ_TEMPORARY; 554 } 555 556 /* Install the new object into the parent's list of children */ 557 558 AcpiNsInstallNode (WalkState, Node, NewNode, Type); 559 *ReturnNode = NewNode; 560 return_ACPI_STATUS (AE_OK); 561 } 562