1 /*******************************************************************************
3 * Module Name: nssearch - Namespace search
5 ******************************************************************************/
7 /******************************************************************************
11 * Some or all of this work - Copyright (c) 1999 - 2018, Intel Corp.
12 * All rights reserved.
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
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
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;
37 * The above copyright and patent license is granted only if the following
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.
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
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
72 * 3.4. Intel retains all right, title, and interest in and to the Original
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.
80 * 4. Disclaimer and Export Compliance
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
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
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.
114 *****************************************************************************
116 * Alternatively, you may choose to be licensed under the terms of the
119 * Redistribution and use in source and binary forms, with or without
120 * modification, are permitted provided that the following conditions
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.
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.
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.
150 *****************************************************************************/
153 #include "accommon.h"
154 #include "acnamesp.h"
156 #ifdef ACPI_ASL_COMPILER
160 #define _COMPONENT ACPI_NAMESPACE
161 ACPI_MODULE_NAME ("nssearch")
163 /* Local prototypes */
166 AcpiNsSearchParentTree (
168 ACPI_NAMESPACE_NODE
*Node
,
169 ACPI_OBJECT_TYPE Type
,
170 ACPI_NAMESPACE_NODE
**ReturnNode
);
173 /*******************************************************************************
175 * FUNCTION: AcpiNsSearchOneScope
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
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.
189 * Named object lists are built (and subsequently dumped) in the
190 * order in which the names are encountered during the namespace load;
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.
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.
203 ******************************************************************************/
206 AcpiNsSearchOneScope (
208 ACPI_NAMESPACE_NODE
*ParentNode
,
209 ACPI_OBJECT_TYPE Type
,
210 ACPI_NAMESPACE_NODE
**ReturnNode
)
212 ACPI_NAMESPACE_NODE
*Node
;
215 ACPI_FUNCTION_TRACE (NsSearchOneScope
);
218 #ifdef ACPI_DEBUG_OUTPUT
219 if (ACPI_LV_NAMES
& AcpiDbgLevel
)
223 ScopeName
= AcpiNsGetNormalizedPathname (ParentNode
, TRUE
);
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
)));
231 ACPI_FREE (ScopeName
);
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
240 Node
= ParentNode
->Child
;
243 /* Check for match against the name */
245 if (Node
->Name
.Integer
== TargetName
)
247 /* Resolve a control method alias if any */
249 if (AcpiNsGetType (Node
) == ACPI_TYPE_LOCAL_METHOD_ALIAS
)
251 Node
= ACPI_CAST_PTR (ACPI_NAMESPACE_NODE
, Node
->Object
);
254 /* Found matching entry */
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
));
263 return_ACPI_STATUS (AE_OK
);
266 /* Didn't match name, move on to the next peer object */
271 /* Searched entire namespace level, not found */
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
));
279 return_ACPI_STATUS (AE_NOT_FOUND
);
283 /*******************************************************************************
285 * FUNCTION: AcpiNsSearchParentTree
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
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().
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,
306 ******************************************************************************/
309 AcpiNsSearchParentTree (
311 ACPI_NAMESPACE_NODE
*Node
,
312 ACPI_OBJECT_TYPE Type
,
313 ACPI_NAMESPACE_NODE
**ReturnNode
)
316 ACPI_NAMESPACE_NODE
*ParentNode
;
319 ACPI_FUNCTION_TRACE (NsSearchParentTree
);
322 ParentNode
= Node
->Parent
;
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.
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
);
335 if (AcpiNsLocal (Type
))
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
);
343 /* Search the parent tree */
345 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES
,
346 "Searching parent [%4.4s] for [%4.4s]\n",
347 AcpiUtGetNodeName (ParentNode
), ACPI_CAST_PTR (char, &TargetName
)));
349 /* Search parents until target is found or we have backed up to the root */
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.
358 Status
= AcpiNsSearchOneScope (
359 TargetName
, ParentNode
, ACPI_TYPE_ANY
, ReturnNode
);
360 if (ACPI_SUCCESS (Status
))
362 return_ACPI_STATUS (Status
);
365 /* Not found here, go up another level (until we reach the root) */
367 ParentNode
= ParentNode
->Parent
;
370 /* Not found in parent tree */
372 return_ACPI_STATUS (AE_NOT_FOUND
);
376 /*******************************************************************************
378 * FUNCTION: AcpiNsSearchAndEnter
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
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.
396 * In ACPI_IMODE_EXECUTE, search only.
397 * In other modes, search and add if not found.
399 ******************************************************************************/
402 AcpiNsSearchAndEnter (
404 ACPI_WALK_STATE
*WalkState
,
405 ACPI_NAMESPACE_NODE
*Node
,
406 ACPI_INTERPRETER_MODE InterpreterMode
,
407 ACPI_OBJECT_TYPE Type
,
409 ACPI_NAMESPACE_NODE
**ReturnNode
)
412 ACPI_NAMESPACE_NODE
*NewNode
;
415 ACPI_FUNCTION_TRACE (NsSearchAndEnter
);
418 /* Parameter validation */
420 if (!Node
|| !TargetName
|| !ReturnNode
)
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
);
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.
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.
437 AcpiUtRepairName (ACPI_CAST_PTR (char, &TargetName
));
439 /* Try to find the name in the namespace level specified by the caller */
441 *ReturnNode
= ACPI_ENTRY_NOT_FOUND
;
442 Status
= AcpiNsSearchOneScope (TargetName
, Node
, Type
, ReturnNode
);
443 if (Status
!= AE_NOT_FOUND
)
446 * If we found it AND the request specifies that a find is an error,
451 /* The node was found in the namespace */
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.
458 if (Flags
& ACPI_NS_OVERRIDE_IF_FOUND
)
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
));
465 AcpiNsDeleteChildren (*ReturnNode
);
466 if (AcpiGbl_RuntimeNamespaceOverride
)
468 AcpiUtRemoveReference ((*ReturnNode
)->Object
);
469 (*ReturnNode
)->Object
= NULL
;
470 (*ReturnNode
)->OwnerId
= WalkState
->OwnerId
;
474 AcpiNsRemoveNode (*ReturnNode
);
475 *ReturnNode
= ACPI_ENTRY_NOT_FOUND
;
479 /* Return an error if we don't expect to find the object */
481 else if (Flags
& ACPI_NS_ERROR_IF_FOUND
)
483 Status
= AE_ALREADY_EXISTS
;
487 #ifdef ACPI_ASL_COMPILER
488 if (*ReturnNode
&& (*ReturnNode
)->Type
== ACPI_TYPE_ANY
)
490 (*ReturnNode
)->Flags
|= ANOBJ_IS_EXTERNAL
;
494 /* Either found it or there was an error: finished either way */
496 return_ACPI_STATUS (Status
);
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.
507 if ((InterpreterMode
!= ACPI_IMODE_LOAD_PASS1
) &&
508 (Flags
& ACPI_NS_SEARCH_PARENT
))
511 * Not found at this level - search parent tree according to the
514 Status
= AcpiNsSearchParentTree (TargetName
, Node
, Type
, ReturnNode
);
515 if (ACPI_SUCCESS (Status
))
517 return_ACPI_STATUS (Status
);
521 /* In execute mode, just search, never add names. Exit now */
523 if (InterpreterMode
== ACPI_IMODE_EXECUTE
)
525 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES
,
526 "%4.4s Not found in %p [Not adding]\n",
527 ACPI_CAST_PTR (char, &TargetName
), Node
));
529 return_ACPI_STATUS (AE_NOT_FOUND
);
532 /* Create the new named object */
534 NewNode
= AcpiNsCreateNode (TargetName
);
537 return_ACPI_STATUS (AE_NO_MEMORY
);
540 #ifdef ACPI_ASL_COMPILER
542 /* Node is an object defined by an External() statement */
544 if (Flags
& ACPI_NS_EXTERNAL
||
545 (WalkState
&& WalkState
->Opcode
== AML_SCOPE_OP
))
547 NewNode
->Flags
|= ANOBJ_IS_EXTERNAL
;
548 NewNode
->Flags
|= IMPLICIT_EXTERNAL
;
552 if (Flags
& ACPI_NS_TEMPORARY
)
554 NewNode
->Flags
|= ANOBJ_TEMPORARY
;
557 /* Install the new object into the parent's list of children */
559 AcpiNsInstallNode (WalkState
, Node
, NewNode
, Type
);
560 *ReturnNode
= NewNode
;
561 return_ACPI_STATUS (AE_OK
);