reactos/drivers/bus/acpi/acpica/namespace/nssearch.c

   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 - 2009, 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 #define __NSSEARCH_C__
 117
 118 #include "acpi.h"
 119 #include "accommon.h"
 120 #include "acnamesp.h"
 121
 122 #ifdef ACPI_ASL_COMPILER
 123 #include "amlcode.h"
 124 #endif
 125
 126 #define _COMPONENT          ACPI_NAMESPACE
 127         ACPI_MODULE_NAME    ("nssearch")
 128
 129 /* Local prototypes */
 130
 131 static ACPI_STATUS
 132 AcpiNsSearchParentTree (
 133     UINT32                  TargetName,
 134     ACPI_NAMESPACE_NODE     *Node,
 135     ACPI_OBJECT_TYPE        Type,
 136     ACPI_NAMESPACE_NODE     **ReturnNode);
 137
 138
 139 /*******************************************************************************
 140  *
 141  * FUNCTION:    AcpiNsSearchOneScope
 142  *
 143  * PARAMETERS:  TargetName      - Ascii ACPI name to search for
 144  *              ParentNode      - Starting node where search will begin
 145  *              Type            - Object type to match
 146  *              ReturnNode      - Where the matched Named obj is returned
 147  *
 148  * RETURN:      Status
 149  *
 150  * DESCRIPTION: Search a single level of the namespace. Performs a
 151  *              simple search of the specified level, and does not add
 152  *              entries or search parents.
 153  *
 154  *
 155  *      Named object lists are built (and subsequently dumped) in the
 156  *      order in which the names are encountered during the namespace load;
 157  *
 158  *      All namespace searching is linear in this implementation, but
 159  *      could be easily modified to support any improved search
 160  *      algorithm. However, the linear search was chosen for simplicity
 161  *      and because the trees are small and the other interpreter
 162  *      execution overhead is relatively high.
 163  *
 164  *      Note: CPU execution analysis has shown that the AML interpreter spends
 165  *      a very small percentage of its time searching the namespace. Therefore,
 166  *      the linear search seems to be sufficient, as there would seem to be
 167  *      little value in improving the search.
 168  *
 169  ******************************************************************************/
 170
 171 ACPI_STATUS
 172 AcpiNsSearchOneScope (
 173     UINT32                  TargetName,
 174     ACPI_NAMESPACE_NODE     *ParentNode,
 175     ACPI_OBJECT_TYPE        Type,
 176     ACPI_NAMESPACE_NODE     **ReturnNode)
 177 {
 178     ACPI_NAMESPACE_NODE     *Node;
 179
 180
 181     ACPI_FUNCTION_TRACE (NsSearchOneScope);
 182
 183
 184 #ifdef ACPI_DEBUG_OUTPUT
 185     if (ACPI_LV_NAMES & AcpiDbgLevel)
 186     {
 187         char                *ScopeName;
 188
 189         ScopeName = AcpiNsGetExternalPathname (ParentNode);
 190         if (ScopeName)
 191         {
 192             ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
 193                 "Searching %s (%p) For [%4.4s] (%s)\n",
 194                 ScopeName, ParentNode, ACPI_CAST_PTR (char, &TargetName),
 195                 AcpiUtGetTypeName (Type)));
 196
 197             ACPI_FREE (ScopeName);
 198         }
 199     }
 200 #endif
 201
 202     /*
 203      * Search for name at this namespace level, which is to say that we
 204      * must search for the name among the children of this object
 205      */
 206     Node = ParentNode->Child;
 207     while (Node)
 208     {
 209         /* Check for match against the name */
 210
 211         if (Node->Name.Integer == TargetName)
 212         {
 213             /* Resolve a control method alias if any */
 214
 215             if (AcpiNsGetType (Node) == ACPI_TYPE_LOCAL_METHOD_ALIAS)
 216             {
 217                 Node = ACPI_CAST_PTR (ACPI_NAMESPACE_NODE, Node->Object);
 218             }
 219
 220             /* Found matching entry */
 221
 222             ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
 223                 "Name [%4.4s] (%s) %p found in scope [%4.4s] %p\n",
 224                 ACPI_CAST_PTR (char, &TargetName),
 225                 AcpiUtGetTypeName (Node->Type),
 226                 Node, AcpiUtGetNodeName (ParentNode), ParentNode));
 227
 228             *ReturnNode = Node;
 229             return_ACPI_STATUS (AE_OK);
 230         }
 231
 232         /*
 233          * The last entry in the list points back to the parent,
 234          * so a flag is used to indicate the end-of-list
 235          */
 236         if (Node->Flags & ANOBJ_END_OF_PEER_LIST)
 237         {
 238             /* Searched entire list, we are done */
 239
 240             break;
 241         }
 242
 243         /* Didn't match name, move on to the next peer object */
 244
 245         Node = Node->Peer;
 246     }
 247
 248     /* Searched entire namespace level, not found */
 249
 250     ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
 251         "Name [%4.4s] (%s) not found in search in scope [%4.4s] "
 252         "%p first child %p\n",
 253         ACPI_CAST_PTR (char, &TargetName), AcpiUtGetTypeName (Type),
 254         AcpiUtGetNodeName (ParentNode), ParentNode, ParentNode->Child));
 255
 256     return_ACPI_STATUS (AE_NOT_FOUND);
 257 }
 258
 259
 260 /*******************************************************************************
 261  *
 262  * FUNCTION:    AcpiNsSearchParentTree
 263  *
 264  * PARAMETERS:  TargetName      - Ascii ACPI name to search for
 265  *              Node            - Starting node where search will begin
 266  *              Type            - Object type to match
 267  *              ReturnNode      - Where the matched Node is returned
 268  *
 269  * RETURN:      Status
 270  *
 271  * DESCRIPTION: Called when a name has not been found in the current namespace
 272  *              level. Before adding it or giving up, ACPI scope rules require
 273  *              searching enclosing scopes in cases identified by AcpiNsLocal().
 274  *
 275  *              "A name is located by finding the matching name in the current
 276  *              name space, and then in the parent name space. If the parent
 277  *              name space does not contain the name, the search continues
 278  *              recursively until either the name is found or the name space
 279  *              does not have a parent (the root of the name space). This
 280  *              indicates that the name is not found" (From ACPI Specification,
 281  *              section 5.3)
 282  *
 283  ******************************************************************************/
 284
 285 static ACPI_STATUS
 286 AcpiNsSearchParentTree (
 287     UINT32                  TargetName,
 288     ACPI_NAMESPACE_NODE     *Node,
 289     ACPI_OBJECT_TYPE        Type,
 290     ACPI_NAMESPACE_NODE     **ReturnNode)
 291 {
 292     ACPI_STATUS             Status;
 293     ACPI_NAMESPACE_NODE     *ParentNode;
 294
 295
 296     ACPI_FUNCTION_TRACE (NsSearchParentTree);
 297
 298
 299     ParentNode = AcpiNsGetParentNode (Node);
 300
 301     /*
 302      * If there is no parent (i.e., we are at the root) or type is "local",
 303      * we won't be searching the parent tree.
 304      */
 305     if (!ParentNode)
 306     {
 307         ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, "[%4.4s] has no parent\n",
 308             ACPI_CAST_PTR (char, &TargetName)));
 309         return_ACPI_STATUS (AE_NOT_FOUND);
 310     }
 311
 312     if (AcpiNsLocal (Type))
 313     {
 314         ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
 315             "[%4.4s] type [%s] must be local to this scope (no parent search)\n",
 316             ACPI_CAST_PTR (char, &TargetName), AcpiUtGetTypeName (Type)));
 317         return_ACPI_STATUS (AE_NOT_FOUND);
 318     }
 319
 320     /* Search the parent tree */
 321
 322     ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
 323         "Searching parent [%4.4s] for [%4.4s]\n",
 324         AcpiUtGetNodeName (ParentNode), ACPI_CAST_PTR (char, &TargetName)));
 325
 326     /* Search parents until target is found or we have backed up to the root */
 327
 328     while (ParentNode)
 329     {
 330         /*
 331          * Search parent scope. Use TYPE_ANY because we don't care about the
 332          * object type at this point, we only care about the existence of
 333          * the actual name we are searching for. Typechecking comes later.
 334          */
 335         Status = AcpiNsSearchOneScope (
 336                     TargetName, ParentNode, ACPI_TYPE_ANY, ReturnNode);
 337         if (ACPI_SUCCESS (Status))
 338         {
 339             return_ACPI_STATUS (Status);
 340         }
 341
 342         /* Not found here, go up another level (until we reach the root) */
 343
 344         ParentNode = AcpiNsGetParentNode (ParentNode);
 345     }
 346
 347     /* Not found in parent tree */
 348
 349     return_ACPI_STATUS (AE_NOT_FOUND);
 350 }
 351
 352
 353 /*******************************************************************************
 354  *
 355  * FUNCTION:    AcpiNsSearchAndEnter
 356  *
 357  * PARAMETERS:  TargetName          - Ascii ACPI name to search for (4 chars)
 358  *              WalkState           - Current state of the walk
 359  *              Node                - Starting node where search will begin
 360  *              InterpreterMode     - Add names only in ACPI_MODE_LOAD_PASS_x.
 361  *                                    Otherwise,search only.
 362  *              Type                - Object type to match
 363  *              Flags               - Flags describing the search restrictions
 364  *              ReturnNode          - Where the Node is returned
 365  *
 366  * RETURN:      Status
 367  *
 368  * DESCRIPTION: Search for a name segment in a single namespace level,
 369  *              optionally adding it if it is not found. If the passed
 370  *              Type is not Any and the type previously stored in the
 371  *              entry was Any (i.e. unknown), update the stored type.
 372  *
 373  *              In ACPI_IMODE_EXECUTE, search only.
 374  *              In other modes, search and add if not found.
 375  *
 376  ******************************************************************************/
 377
 378 ACPI_STATUS
 379 AcpiNsSearchAndEnter (
 380     UINT32                  TargetName,
 381     ACPI_WALK_STATE         *WalkState,
 382     ACPI_NAMESPACE_NODE     *Node,
 383     ACPI_INTERPRETER_MODE   InterpreterMode,
 384     ACPI_OBJECT_TYPE        Type,
 385     UINT32                  Flags,
 386     ACPI_NAMESPACE_NODE     **ReturnNode)
 387 {
 388     ACPI_STATUS             Status;
 389     ACPI_NAMESPACE_NODE     *NewNode;
 390
 391
 392     ACPI_FUNCTION_TRACE (NsSearchAndEnter);
 393
 394
 395     /* Parameter validation */
 396
 397     if (!Node || !TargetName || !ReturnNode)
 398     {
 399         ACPI_ERROR ((AE_INFO,
 400             "Null parameter: Node %p Name %X ReturnNode %p",
 401             Node, TargetName, ReturnNode));
 402         return_ACPI_STATUS (AE_BAD_PARAMETER);
 403     }
 404
 405     /*
 406      * Name must consist of valid ACPI characters. We will repair the name if
 407      * necessary because we don't want to abort because of this, but we want
 408      * all namespace names to be printable. A warning message is appropriate.
 409      *
 410      * This issue came up because there are in fact machines that exhibit
 411      * this problem, and we want to be able to enable ACPI support for them,
 412      * even though there are a few bad names.
 413      */
 414     AcpiUtRepairName (ACPI_CAST_PTR (char, &TargetName));
 415
 416     /* Try to find the name in the namespace level specified by the caller */
 417
 418     *ReturnNode = ACPI_ENTRY_NOT_FOUND;
 419     Status = AcpiNsSearchOneScope (TargetName, Node, Type, ReturnNode);
 420     if (Status != AE_NOT_FOUND)
 421     {
 422         /*
 423          * If we found it AND the request specifies that a find is an error,
 424          * return the error
 425          */
 426         if ((Status == AE_OK) &&
 427             (Flags & ACPI_NS_ERROR_IF_FOUND))
 428         {
 429             Status = AE_ALREADY_EXISTS;
 430         }
 431
 432 #ifdef ACPI_ASL_COMPILER
 433         if (*ReturnNode && (*ReturnNode)->Type == ACPI_TYPE_ANY)
 434         {
 435             (*ReturnNode)->Flags |= ANOBJ_IS_EXTERNAL;
 436         }
 437 #endif
 438
 439         /* Either found it or there was an error: finished either way */
 440
 441         return_ACPI_STATUS (Status);
 442     }
 443
 444     /*
 445      * The name was not found. If we are NOT performing the first pass
 446      * (name entry) of loading the namespace, search the parent tree (all the
 447      * way to the root if necessary.) We don't want to perform the parent
 448      * search when the namespace is actually being loaded. We want to perform
 449      * the search when namespace references are being resolved (load pass 2)
 450      * and during the execution phase.
 451      */
 452     if ((InterpreterMode != ACPI_IMODE_LOAD_PASS1) &&
 453         (Flags & ACPI_NS_SEARCH_PARENT))
 454     {
 455         /*
 456          * Not found at this level - search parent tree according to the
 457          * ACPI specification
 458          */
 459         Status = AcpiNsSearchParentTree (TargetName, Node, Type, ReturnNode);
 460         if (ACPI_SUCCESS (Status))
 461         {
 462             return_ACPI_STATUS (Status);
 463         }
 464     }
 465
 466     /* In execute mode, just search, never add names. Exit now */
 467
 468     if (InterpreterMode == ACPI_IMODE_EXECUTE)
 469     {
 470         ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
 471             "%4.4s Not found in %p [Not adding]\n",
 472             ACPI_CAST_PTR (char, &TargetName), Node));
 473
 474         return_ACPI_STATUS (AE_NOT_FOUND);
 475     }
 476
 477     /* Create the new named object */
 478
 479     NewNode = AcpiNsCreateNode (TargetName);
 480     if (!NewNode)
 481     {
 482         return_ACPI_STATUS (AE_NO_MEMORY);
 483     }
 484
 485 #ifdef ACPI_ASL_COMPILER
 486
 487     /* Node is an object defined by an External() statement */
 488
 489     if (Flags & ACPI_NS_EXTERNAL ||
 490         (WalkState && WalkState->Opcode == AML_SCOPE_OP))
 491     {
 492         NewNode->Flags |= ANOBJ_IS_EXTERNAL;
 493     }
 494 #endif
 495
 496     if (Flags & ACPI_NS_TEMPORARY)
 497     {
 498         NewNode->Flags |= ANOBJ_TEMPORARY;
 499     }
 500
 501     /* Install the new object into the parent's list of children */
 502
 503     AcpiNsInstallNode (WalkState, Node, NewNode, Type);
 504     *ReturnNode = NewNode;
 505     return_ACPI_STATUS (AE_OK);
 506 }
 507