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

   1 /*******************************************************************************
   2  *
   3  * Module Name: nseval - Object evaluation, includes control method execution
   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  *
  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
  71  * distribution.
  72  *
  73  * 3.4. Intel retains all right, title, and interest in and to the Original
  74  * Intel Code.
  75  *
  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.
  80  *
  81  * 4. Disclaimer and Export Compliance
  82  *
  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
  89  * PARTICULAR PURPOSE.
  90  *
  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
  98  * LIMITED REMEDY.
  99  *
 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.
 114  *
 115  *****************************************************************************/
 116
 117 #define __NSEVAL_C__
 118
 119 #include "acpi.h"
 120 #include "accommon.h"
 121 #include "acparser.h"
 122 #include "acinterp.h"
 123 #include "acnamesp.h"
 124
 125
 126 #define _COMPONENT          ACPI_NAMESPACE
 127         ACPI_MODULE_NAME    ("nseval")
 128
 129 /* Local prototypes */
 130
 131 static void
 132 AcpiNsExecModuleCode (
 133     ACPI_OPERAND_OBJECT     *MethodObj,
 134     ACPI_EVALUATE_INFO      *Info);
 135
 136
 137 /*******************************************************************************
 138  *
 139  * FUNCTION:    AcpiNsEvaluate
 140  *
 141  * PARAMETERS:  Info            - Evaluation info block, contains:
 142  *                  PrefixNode      - Prefix or Method/Object Node to execute
 143  *                  Pathname        - Name of method to execute, If NULL, the
 144  *                                    Node is the object to execute
 145  *                  Parameters      - List of parameters to pass to the method,
 146  *                                    terminated by NULL. Params itself may be
 147  *                                    NULL if no parameters are being passed.
 148  *                  ReturnObject    - Where to put method's return value (if
 149  *                                    any). If NULL, no value is returned.
 150  *                  ParameterType   - Type of Parameter list
 151  *                  ReturnObject    - Where to put method's return value (if
 152  *                                    any). If NULL, no value is returned.
 153  *                  Flags           - ACPI_IGNORE_RETURN_VALUE to delete return
 154  *
 155  * RETURN:      Status
 156  *
 157  * DESCRIPTION: Execute a control method or return the current value of an
 158  *              ACPI namespace object.
 159  *
 160  * MUTEX:       Locks interpreter
 161  *
 162  ******************************************************************************/
 163
 164 ACPI_STATUS
 165 AcpiNsEvaluate (
 166     ACPI_EVALUATE_INFO      *Info)
 167 {
 168     ACPI_STATUS             Status;
 169     ACPI_NAMESPACE_NODE     *Node;
 170
 171
 172     ACPI_FUNCTION_TRACE (NsEvaluate);
 173
 174
 175     if (!Info)
 176     {
 177         return_ACPI_STATUS (AE_BAD_PARAMETER);
 178     }
 179
 180     /* Initialize the return value to an invalid object */
 181
 182     Info->ReturnObject = NULL;
 183     Info->ParamCount = 0;
 184
 185     /*
 186      * Get the actual namespace node for the target object. Handles these cases:
 187      *
 188      * 1) Null node, Pathname (absolute path)
 189      * 2) Node, Pathname (path relative to Node)
 190      * 3) Node, Null Pathname
 191      */
 192     Status = AcpiNsGetNode (Info->PrefixNode, Info->Pathname,
 193                 ACPI_NS_NO_UPSEARCH, &Info->ResolvedNode);
 194     if (ACPI_FAILURE (Status))
 195     {
 196         return_ACPI_STATUS (Status);
 197     }
 198
 199     /*
 200      * For a method alias, we must grab the actual method node so that proper
 201      * scoping context will be established before execution.
 202      */
 203     if (AcpiNsGetType (Info->ResolvedNode) == ACPI_TYPE_LOCAL_METHOD_ALIAS)
 204     {
 205         Info->ResolvedNode =
 206             ACPI_CAST_PTR (ACPI_NAMESPACE_NODE, Info->ResolvedNode->Object);
 207     }
 208
 209     ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, "%s [%p] Value %p\n", Info->Pathname,
 210         Info->ResolvedNode, AcpiNsGetAttachedObject (Info->ResolvedNode)));
 211
 212     Node = Info->ResolvedNode;
 213
 214     /*
 215      * Two major cases here:
 216      *
 217      * 1) The object is a control method -- execute it
 218      * 2) The object is not a method -- just return it's current value
 219      */
 220     if (AcpiNsGetType (Info->ResolvedNode) == ACPI_TYPE_METHOD)
 221     {
 222         /*
 223          * 1) Object is a control method - execute it
 224          */
 225
 226         /* Verify that there is a method object associated with this node */
 227
 228         Info->ObjDesc = AcpiNsGetAttachedObject (Info->ResolvedNode);
 229         if (!Info->ObjDesc)
 230         {
 231             ACPI_ERROR ((AE_INFO, "Control method has no attached sub-object"));
 232             return_ACPI_STATUS (AE_NULL_OBJECT);
 233         }
 234
 235         /* Count the number of arguments being passed to the method */
 236
 237         if (Info->Parameters)
 238         {
 239             while (Info->Parameters[Info->ParamCount])
 240             {
 241                 if (Info->ParamCount > ACPI_METHOD_MAX_ARG)
 242                 {
 243                     return_ACPI_STATUS (AE_LIMIT);
 244                 }
 245                 Info->ParamCount++;
 246             }
 247         }
 248
 249         ACPI_DUMP_PATHNAME (Info->ResolvedNode, "ACPI: Execute Method",
 250             ACPI_LV_INFO, _COMPONENT);
 251
 252         ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
 253             "Method at AML address %p Length %X\n",
 254             Info->ObjDesc->Method.AmlStart + 1,
 255             Info->ObjDesc->Method.AmlLength - 1));
 256
 257         /*
 258          * Any namespace deletion must acquire both the namespace and
 259          * interpreter locks to ensure that no thread is using the portion of
 260          * the namespace that is being deleted.
 261          *
 262          * Execute the method via the interpreter. The interpreter is locked
 263          * here before calling into the AML parser
 264          */
 265         AcpiExEnterInterpreter ();
 266         Status = AcpiPsExecuteMethod (Info);
 267         AcpiExExitInterpreter ();
 268     }
 269     else
 270     {
 271         /*
 272          * 2) Object is not a method, return its current value
 273          *
 274          * Disallow certain object types. For these, "evaluation" is undefined.
 275          */
 276         switch (Info->ResolvedNode->Type)
 277         {
 278         case ACPI_TYPE_DEVICE:
 279         case ACPI_TYPE_EVENT:
 280         case ACPI_TYPE_MUTEX:
 281         case ACPI_TYPE_REGION:
 282         case ACPI_TYPE_THERMAL:
 283         case ACPI_TYPE_LOCAL_SCOPE:
 284
 285             ACPI_ERROR ((AE_INFO,
 286                 "[%4.4s] Evaluation of object type [%s] is not supported",
 287                 Info->ResolvedNode->Name.Ascii,
 288                 AcpiUtGetTypeName (Info->ResolvedNode->Type)));
 289
 290             return_ACPI_STATUS (AE_TYPE);
 291
 292         default:
 293             break;
 294         }
 295
 296         /*
 297          * Objects require additional resolution steps (e.g., the Node may be
 298          * a field that must be read, etc.) -- we can't just grab the object
 299          * out of the node.
 300          *
 301          * Use ResolveNodeToValue() to get the associated value.
 302          *
 303          * NOTE: we can get away with passing in NULL for a walk state because
 304          * ResolvedNode is guaranteed to not be a reference to either a method
 305          * local or a method argument (because this interface is never called
 306          * from a running method.)
 307          *
 308          * Even though we do not directly invoke the interpreter for object
 309          * resolution, we must lock it because we could access an opregion.
 310          * The opregion access code assumes that the interpreter is locked.
 311          */
 312         AcpiExEnterInterpreter ();
 313
 314         /* Function has a strange interface */
 315
 316         Status = AcpiExResolveNodeToValue (&Info->ResolvedNode, NULL);
 317         AcpiExExitInterpreter ();
 318
 319         /*
 320          * If AcpiExResolveNodeToValue() succeeded, the return value was placed
 321          * in ResolvedNode.
 322          */
 323         if (ACPI_SUCCESS (Status))
 324         {
 325             Status = AE_CTRL_RETURN_VALUE;
 326             Info->ReturnObject =
 327                 ACPI_CAST_PTR (ACPI_OPERAND_OBJECT, Info->ResolvedNode);
 328
 329             ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, "Returning object %p [%s]\n",
 330                 Info->ReturnObject,
 331                 AcpiUtGetObjectTypeName (Info->ReturnObject)));
 332         }
 333     }
 334
 335     /*
 336      * Check input argument count against the ASL-defined count for a method.
 337      * Also check predefined names: argument count and return value against
 338      * the ACPI specification. Some incorrect return value types are repaired.
 339      */
 340     (void) AcpiNsCheckPredefinedNames (Node, Info->ParamCount,
 341                 Status, &Info->ReturnObject);
 342
 343     /* Check if there is a return value that must be dealt with */
 344
 345     if (Status == AE_CTRL_RETURN_VALUE)
 346     {
 347         /* If caller does not want the return value, delete it */
 348
 349         if (Info->Flags & ACPI_IGNORE_RETURN_VALUE)
 350         {
 351             AcpiUtRemoveReference (Info->ReturnObject);
 352             Info->ReturnObject = NULL;
 353         }
 354
 355         /* Map AE_CTRL_RETURN_VALUE to AE_OK, we are done with it */
 356
 357         Status = AE_OK;
 358     }
 359
 360     ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
 361         "*** Completed evaluation of object %s ***\n", Info->Pathname));
 362
 363     /*
 364      * Namespace was unlocked by the handling AcpiNs* function, so we
 365      * just return
 366      */
 367     return_ACPI_STATUS (Status);
 368 }
 369
 370
 371 /*******************************************************************************
 372  *
 373  * FUNCTION:    AcpiNsExecModuleCodeList
 374  *
 375  * PARAMETERS:  None
 376  *
 377  * RETURN:      None. Exceptions during method execution are ignored, since
 378  *              we cannot abort a table load.
 379  *
 380  * DESCRIPTION: Execute all elements of the global module-level code list.
 381  *              Each element is executed as a single control method.
 382  *
 383  ******************************************************************************/
 384
 385 void
 386 AcpiNsExecModuleCodeList (
 387     void)
 388 {
 389     ACPI_OPERAND_OBJECT     *Prev;
 390     ACPI_OPERAND_OBJECT     *Next;
 391     ACPI_EVALUATE_INFO      *Info;
 392     UINT32                  MethodCount = 0;
 393
 394
 395     ACPI_FUNCTION_TRACE (NsExecModuleCodeList);
 396
 397
 398     /* Exit now if the list is empty */
 399
 400     Next = AcpiGbl_ModuleCodeList;
 401     if (!Next)
 402     {
 403         return_VOID;
 404     }
 405
 406     /* Allocate the evaluation information block */
 407
 408     Info = ACPI_ALLOCATE (sizeof (ACPI_EVALUATE_INFO));
 409     if (!Info)
 410     {
 411         return_VOID;
 412     }
 413
 414     /* Walk the list, executing each "method" */
 415
 416     while (Next)
 417     {
 418         Prev = Next;
 419         Next = Next->Method.Mutex;
 420
 421         /* Clear the link field and execute the method */
 422
 423         Prev->Method.Mutex = NULL;
 424         AcpiNsExecModuleCode (Prev, Info);
 425         MethodCount++;
 426
 427         /* Delete the (temporary) method object */
 428
 429         AcpiUtRemoveReference (Prev);
 430     }
 431
 432     ACPI_INFO ((AE_INFO,
 433         "Executed %u blocks of module-level executable AML code",
 434         MethodCount));
 435
 436     ACPI_FREE (Info);
 437     AcpiGbl_ModuleCodeList = NULL;
 438     return_VOID;
 439 }
 440
 441
 442 /*******************************************************************************
 443  *
 444  * FUNCTION:    AcpiNsExecModuleCode
 445  *
 446  * PARAMETERS:  MethodObj           - Object container for the module-level code
 447  *              Info                - Info block for method evaluation
 448  *
 449  * RETURN:      None. Exceptions during method execution are ignored, since
 450  *              we cannot abort a table load.
 451  *
 452  * DESCRIPTION: Execute a control method containing a block of module-level
 453  *              executable AML code. The control method is temporarily
 454  *              installed to the root node, then evaluated.
 455  *
 456  ******************************************************************************/
 457
 458 static void
 459 AcpiNsExecModuleCode (
 460     ACPI_OPERAND_OBJECT     *MethodObj,
 461     ACPI_EVALUATE_INFO      *Info)
 462 {
 463     ACPI_OPERAND_OBJECT     *ParentObj;
 464     ACPI_NAMESPACE_NODE     *ParentNode;
 465     ACPI_OBJECT_TYPE        Type;
 466     ACPI_STATUS             Status;
 467
 468
 469     ACPI_FUNCTION_TRACE (NsExecModuleCode);
 470
 471
 472     /*
 473      * Get the parent node. We cheat by using the NextObject field
 474      * of the method object descriptor.
 475      */
 476     ParentNode = ACPI_CAST_PTR (ACPI_NAMESPACE_NODE,
 477                     MethodObj->Method.NextObject);
 478     Type = AcpiNsGetType (ParentNode);
 479
 480     /*
 481      * Get the region handler and save it in the method object. We may need
 482      * this if an operation region declaration causes a _REG method to be run.
 483      *
 484      * We can't do this in AcpiPsLinkModuleCode because
 485      * AcpiGbl_RootNode->Object is NULL at PASS1.
 486      */
 487     if ((Type == ACPI_TYPE_DEVICE) && ParentNode->Object)
 488     {
 489         MethodObj->Method.Extra.Handler =
 490             ParentNode->Object->Device.Handler;
 491     }
 492
 493     /* Must clear NextObject (AcpiNsAttachObject needs the field) */
 494
 495     MethodObj->Method.NextObject = NULL;
 496
 497     /* Initialize the evaluation information block */
 498
 499     ACPI_MEMSET (Info, 0, sizeof (ACPI_EVALUATE_INFO));
 500     Info->PrefixNode = ParentNode;
 501
 502     /*
 503      * Get the currently attached parent object. Add a reference, because the
 504      * ref count will be decreased when the method object is installed to
 505      * the parent node.
 506      */
 507     ParentObj = AcpiNsGetAttachedObject (ParentNode);
 508     if (ParentObj)
 509     {
 510         AcpiUtAddReference (ParentObj);
 511     }
 512
 513     /* Install the method (module-level code) in the parent node */
 514
 515     Status = AcpiNsAttachObject (ParentNode, MethodObj,
 516                 ACPI_TYPE_METHOD);
 517     if (ACPI_FAILURE (Status))
 518     {
 519         goto Exit;
 520     }
 521
 522     /* Execute the parent node as a control method */
 523
 524     Status = AcpiNsEvaluate (Info);
 525
 526     ACPI_DEBUG_PRINT ((ACPI_DB_INIT, "Executed module-level code at %p\n",
 527         MethodObj->Method.AmlStart));
 528
 529     /* Delete a possible implicit return value (in slack mode) */
 530
 531     if (Info->ReturnObject)
 532     {
 533         AcpiUtRemoveReference (Info->ReturnObject);
 534     }
 535
 536     /* Detach the temporary method object */
 537
 538     AcpiNsDetachObject (ParentNode);
 539
 540     /* Restore the original parent object */
 541
 542     if (ParentObj)
 543     {
 544         Status = AcpiNsAttachObject (ParentNode, ParentObj, Type);
 545     }
 546     else
 547     {
 548         ParentNode->Type = (UINT8) Type;
 549     }
 550
 551 Exit:
 552     if (ParentObj)
 553     {
 554         AcpiUtRemoveReference (ParentObj);
 555     }
 556     return_VOID;
 557 }
 558