1 /*******************************************************************************
3 * Module Name: nssearch - Namespace search
6 ******************************************************************************/
8 /******************************************************************************
12 * Some or all of this work - Copyright (c) 1999, 2000, Intel Corp.
13 * All rights reserved.
17 * 2.1. This is your license from Intel Corp. under its intellectual property
18 * rights. You may have additional license terms from the party that provided
19 * you this software, covering your right to use that party's intellectual
22 * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
23 * copy of the source code appearing in this file ("Covered Code") an
24 * irrevocable, perpetual, worldwide license under Intel's copyrights in the
25 * base code distributed originally by Intel ("Original Intel Code") to copy,
26 * make derivatives, distribute, use and display any portion of the Covered
27 * Code in any form, with the right to sublicense such rights; and
29 * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
30 * license (with the right to sublicense), under only those claims of Intel
31 * patents that are infringed by the Original Intel Code, to make, use, sell,
32 * offer to sell, and import the Covered Code and derivative works thereof
33 * solely to the minimum extent necessary to exercise the above copyright
34 * license, and in no event shall the patent license extend to any additions
35 * to or modifications of the Original Intel Code. No other license or right
36 * is granted directly or by implication, estoppel or otherwise;
38 * The above copyright and patent license is granted only if the following
43 * 3.1. Redistribution of Source with Rights to Further Distribute Source.
44 * Redistribution of source code of any substantial portion of the Covered
45 * Code or modification with rights to further distribute source must include
46 * the above Copyright Notice, the above License, this list of Conditions,
47 * and the following Disclaimer and Export Compliance provision. In addition,
48 * Licensee must cause all Covered Code to which Licensee contributes to
49 * contain a file documenting the changes Licensee made to create that Covered
50 * Code and the date of any change. Licensee must include in that file the
51 * documentation of any changes made by any predecessor Licensee. Licensee
52 * must include a prominent statement that the modification is derived,
53 * directly or indirectly, from Original Intel Code.
55 * 3.2. Redistribution of Source with no Rights to Further Distribute Source.
56 * Redistribution of source code of any substantial portion of the Covered
57 * Code or modification without rights to further distribute source must
58 * include the following Disclaimer and Export Compliance provision in the
59 * documentation and/or other materials provided with distribution. In
60 * addition, Licensee may not authorize further sublicense of source of any
61 * portion of the Covered Code, and must include terms to the effect that the
62 * license from Licensee to its licensee is limited to the intellectual
63 * property embodied in the software Licensee provides to its licensee, and
64 * not to intellectual property embodied in modifications its licensee may
67 * 3.3. Redistribution of Executable. Redistribution in executable form of any
68 * substantial portion of the Covered Code or modification must reproduce the
69 * above Copyright Notice, and the following Disclaimer and Export Compliance
70 * provision in the documentation and/or other materials provided with the
73 * 3.4. Intel retains all right, title, and interest in and to the Original
76 * 3.5. Neither the name Intel nor any other trademark owned or controlled by
77 * Intel shall be used in advertising or otherwise to promote the sale, use or
78 * other dealings in products derived from or relating to the Covered Code
79 * without prior written authorization from Intel.
81 * 4. Disclaimer and Export Compliance
83 * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
84 * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
85 * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE,
86 * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY
87 * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY
88 * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
91 * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
92 * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
93 * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
94 * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
95 * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
96 * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS
97 * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
100 * 4.3. Licensee shall not export, either directly or indirectly, any of this
101 * software or system incorporating such software without first obtaining any
102 * required license or other approval from the U. S. Department of Commerce or
103 * any other agency or department of the United States Government. In the
104 * event Licensee exports any such software from the United States or
105 * re-exports any such software from a foreign destination, Licensee shall
106 * ensure that the distribution and export/re-export of the software is in
107 * compliance with all laws, regulations, orders, or other restrictions of the
108 * U.S. Export Administration Regulations. Licensee agrees that neither it nor
109 * any of its subsidiaries will export/re-export any technical data, process,
110 * software, or service, directly or indirectly, to any country for which the
111 * United States government or any agency thereof requires an export license,
112 * other governmental approval, or letter of assurance, without first obtaining
113 * such license, approval or letter.
115 *****************************************************************************/
117 #define __NSSEARCH_C__
121 #include "acinterp.h"
122 #include "acnamesp.h"
125 #define _COMPONENT NAMESPACE
126 MODULE_NAME ("nssearch")
129 /*******************************************************************************
131 * FUNCTION: AcpiNsSearchNode
133 * PARAMETERS: *TargetName - Ascii ACPI name to search for
134 * *Node - Starting table where search will begin
135 * Type - Object type to match
136 * **ReturnNode - Where the matched Named obj is returned
140 * DESCRIPTION: Search a single namespace table. Performs a simple search,
141 * does not add entries or search parents.
144 * Named object lists are built (and subsequently dumped) in the
145 * order in which the names are encountered during the namespace load;
147 * All namespace searching is linear in this implementation, but
148 * could be easily modified to support any improved search
149 * algorithm. However, the linear search was chosen for simplicity
150 * and because the trees are small and the other interpreter
151 * execution overhead is relatively high.
153 ******************************************************************************/
158 ACPI_NAMESPACE_NODE *Node,
159 OBJECT_TYPE_INTERNAL Type,
160 ACPI_NAMESPACE_NODE **ReturnNode)
162 ACPI_NAMESPACE_NODE *NextNode;
165 FUNCTION_TRACE ("NsSearchNode");
168 DEBUG_EXEC (NATIVE_CHAR *ScopeName = AcpiNsGetTablePathname (Node));
169 DEBUG_PRINT (TRACE_NAMES,
170 ("NsSearchNode: Searching %s [%p]\n",
172 DEBUG_PRINT (TRACE_NAMES,
173 ("NsSearchNode: For %4.4s (type %X)\n",
175 DEBUG_EXEC (AcpiCmFree (ScopeName));
180 * Search for name in this table, which is to say that we must search
181 * for the name among the children of this object
184 NextNode = Node->Child;
187 /* Check for match against the name */
189 if (NextNode->Name == TargetName)
192 * Found matching entry. Capture type if
193 * appropriate before returning the entry.
197 * The DefFieldDefn and BankFieldDefn cases
198 * are actually looking up the Region in which
199 * the field will be defined
202 if ((INTERNAL_TYPE_DEF_FIELD_DEFN == Type) ||
203 (INTERNAL_TYPE_BANK_FIELD_DEFN == Type))
205 Type = ACPI_TYPE_REGION;
209 * Scope, DefAny, and IndexFieldDefn are bogus
210 * "types" which do not actually have anything
211 * to do with the type of the name being looked
212 * up. For any other value of Type, if the type
213 * stored in the entry is Any (i.e. unknown),
214 * save the actual type.
217 if (Type != INTERNAL_TYPE_SCOPE &&
218 Type != INTERNAL_TYPE_DEF_ANY &&
219 Type != INTERNAL_TYPE_INDEX_FIELD_DEFN &&
220 NextNode->Type == ACPI_TYPE_ANY)
222 NextNode->Type = (UINT8) Type;
225 DEBUG_PRINT (TRACE_NAMES,
226 ("NsSearchNode: Name %4.4s (actual type %X) found at %p\n",
227 &TargetName, NextNode->Type, NextNode));
229 *ReturnNode = NextNode;
230 return_ACPI_STATUS (AE_OK);
235 * The last entry in the list points back to the parent,
236 * so a flag is used to indicate the end-of-list
238 if (NextNode->Flags & ANOBJ_END_OF_PEER_LIST)
240 /* Searched entire list, we are done */
245 /* Didn't match name, move on to the next peer object */
247 NextNode = NextNode->Peer;
251 /* Searched entire table, not found */
253 DEBUG_PRINT (TRACE_NAMES,
254 ("NsSearchNode: Name %4.4s (type %X) not found at %p\n",
255 &TargetName, Type, NextNode));
258 return_ACPI_STATUS (AE_NOT_FOUND);
262 /*******************************************************************************
264 * FUNCTION: AcpiNsSearchParentTree
266 * PARAMETERS: *TargetName - Ascii ACPI name to search for
267 * *Node - Starting table where search will begin
268 * Type - Object type to match
269 * **ReturnNode - Where the matched Named Obj is returned
273 * DESCRIPTION: Called when a name has not been found in the current namespace
274 * table. Before adding it or giving up, ACPI scope rules require
275 * searching enclosing scopes in cases identified by AcpiNsLocal().
277 * "A name is located by finding the matching name in the current
278 * name space, and then in the parent name space. If the parent
279 * name space does not contain the name, the search continues
280 * recursively until either the name is found or the name space
281 * does not have a parent (the root of the name space). This
282 * indicates that the name is not found" (From ACPI Specification,
285 ******************************************************************************/
288 AcpiNsSearchParentTree (
290 ACPI_NAMESPACE_NODE *Node,
291 OBJECT_TYPE_INTERNAL Type,
292 ACPI_NAMESPACE_NODE **ReturnNode)
295 ACPI_NAMESPACE_NODE *ParentNode;
298 FUNCTION_TRACE ("NsSearchParentTree");
301 ParentNode = AcpiNsGetParentObject (Node);
304 * If there is no parent (at the root) or type is "local", we won't be
305 * searching the parent tree.
307 if ((AcpiNsLocal (Type)) ||
312 DEBUG_PRINT (TRACE_NAMES,
313 ("NsSearchParentTree: [%4.4s] has no parent\n",
317 if (AcpiNsLocal (Type))
319 DEBUG_PRINT (TRACE_NAMES,
320 ("NsSearchParentTree: [%4.4s] (type %X) is local (no search)\n",
324 return_ACPI_STATUS (AE_NOT_FOUND);
328 /* Search the parent tree */
330 DEBUG_PRINT (TRACE_NAMES,
331 ("NsSearchParentTree: Searching parent for %4.4s\n",
335 * Search parents until found the target or we have backed up to
341 /* Search parent scope */
342 /* TBD: [Investigate] Why ACPI_TYPE_ANY? */
344 Status = AcpiNsSearchNode (TargetName, ParentNode,
345 ACPI_TYPE_ANY, ReturnNode);
347 if (ACPI_SUCCESS (Status))
349 return_ACPI_STATUS (Status);
353 * Not found here, go up another level
354 * (until we reach the root)
357 ParentNode = AcpiNsGetParentObject (ParentNode);
361 /* Not found in parent tree */
363 return_ACPI_STATUS (AE_NOT_FOUND);
367 /*******************************************************************************
369 * FUNCTION: AcpiNsSearchAndEnter
371 * PARAMETERS: TargetName - Ascii ACPI name to search for (4 chars)
372 * WalkState - Current state of the walk
373 * *Node - Starting table where search will begin
374 * InterpreterMode - Add names only in MODE_LoadPassX.
375 * Otherwise,search only.
376 * Type - Object type to match
377 * Flags - Flags describing the search restrictions
378 * **ReturnNode - Where the Node is returned
382 * DESCRIPTION: Search for a name segment in a single name table,
383 * optionally adding it if it is not found. If the passed
384 * Type is not Any and the type previously stored in the
385 * entry was Any (i.e. unknown), update the stored type.
387 * In IMODE_EXECUTE, search only.
388 * In other modes, search and add if not found.
390 ******************************************************************************/
393 AcpiNsSearchAndEnter (
395 ACPI_WALK_STATE *WalkState,
396 ACPI_NAMESPACE_NODE *Node,
397 OPERATING_MODE InterpreterMode,
398 OBJECT_TYPE_INTERNAL Type,
400 ACPI_NAMESPACE_NODE **ReturnNode)
403 ACPI_NAMESPACE_NODE *NewNode;
406 FUNCTION_TRACE ("NsSearchAndEnter");
409 /* Parameter validation */
411 if (!Node || !TargetName || !ReturnNode)
413 DEBUG_PRINT (ACPI_ERROR,
414 ("NsSearchAndEnter: Null param: Table %p Name %p Return %p\n",
415 Node, TargetName, ReturnNode));
417 REPORT_ERROR (("NsSearchAndEnter: bad (null) parameter\n"));
418 return_ACPI_STATUS (AE_BAD_PARAMETER);
422 /* Name must consist of printable characters */
424 if (!AcpiCmValidAcpiName (TargetName))
426 DEBUG_PRINT (ACPI_ERROR,
427 ("NsSearchAndEnter: *** Bad character in name: %08lx *** \n",
430 REPORT_ERROR (("NsSearchAndEnter: Bad character in ACPI Name\n"));
431 return_ACPI_STATUS (AE_BAD_CHARACTER);
435 /* Try to find the name in the table specified by the caller */
437 *ReturnNode = ENTRY_NOT_FOUND;
438 Status = AcpiNsSearchNode (TargetName, Node,
440 if (Status != AE_NOT_FOUND)
443 * Either found it or there was an error
444 * -- finished either way
446 return_ACPI_STATUS (Status);
451 * Not found in the table. If we are NOT performing the
452 * first pass (name entry) of loading the namespace, search
453 * the parent tree (all the way to the root if necessary.)
454 * We don't want to perform the parent search when the
455 * namespace is actually being loaded. We want to perform
456 * the search when namespace references are being resolved
457 * (load pass 2) and during the execution phase.
460 if ((InterpreterMode != IMODE_LOAD_PASS1) &&
461 (Flags & NS_SEARCH_PARENT))
464 * Not found in table - search parent tree according
465 * to ACPI specification
468 Status = AcpiNsSearchParentTree (TargetName, Node,
470 if (ACPI_SUCCESS (Status))
472 return_ACPI_STATUS (Status);
478 * In execute mode, just search, never add names. Exit now.
480 if (InterpreterMode == IMODE_EXECUTE)
482 DEBUG_PRINT (TRACE_NAMES,
483 ("NsSearchAndEnter: %4.4s Not found in %p [Not adding]\n",
486 return_ACPI_STATUS (AE_NOT_FOUND);
490 /* Create the new named object */
492 NewNode = AcpiNsCreateNode (TargetName);
495 return_ACPI_STATUS (AE_NO_MEMORY);
498 /* Install the new object into the parent's list of children */
500 AcpiNsInstallNode (WalkState, Node, NewNode, Type);
501 *ReturnNode = NewNode;
503 return_ACPI_STATUS (AE_OK);