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  * Copyright (C) 2000 - 2016, Intel Corp.
   9  * All rights reserved.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions, and the following disclaimer,
  16  *    without modification.
  17  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  18  *    substantially similar to the "NO WARRANTY" disclaimer below
  19  *    ("Disclaimer") and any redistribution must be conditioned upon
  20  *    including a substantially similar Disclaimer requirement for further
  21  *    binary redistribution.
  22  * 3. Neither the names of the above-listed copyright holders nor the names
  23  *    of any contributors may be used to endorse or promote products derived
  24  *    from this software without specific prior written permission.
  25  *
  26  * Alternatively, this software may be distributed under the terms of the
  27  * GNU General Public License ("GPL") version 2 as published by the Free
  28  * Software Foundation.
  29  *
  30  * NO WARRANTY
  31  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  32  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  33  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  34  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  35  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  36  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  37  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  38  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  39  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  40  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  41  * POSSIBILITY OF SUCH DAMAGES.
  42  */
  43
  44 #include "acpi.h"
  45 #include "accommon.h"
  46 #include "acparser.h"
  47 #include "acinterp.h"
  48 #include "acnamesp.h"
  49
  50
  51 #define _COMPONENT          ACPI_NAMESPACE
  52         ACPI_MODULE_NAME    ("nseval")
  53
  54 /* Local prototypes */
  55
  56 static void
  57 AcpiNsExecModuleCode (
  58     ACPI_OPERAND_OBJECT     *MethodObj,
  59     ACPI_EVALUATE_INFO      *Info);
  60
  61
  62 /*******************************************************************************
  63  *
  64  * FUNCTION:    AcpiNsEvaluate
  65  *
  66  * PARAMETERS:  Info            - Evaluation info block, contains these fields
  67  *                                and more:
  68  *                  PrefixNode      - Prefix or Method/Object Node to execute
  69  *                  RelativePath    - Name of method to execute, If NULL, the
  70  *                                    Node is the object to execute
  71  *                  Parameters      - List of parameters to pass to the method,
  72  *                                    terminated by NULL. Params itself may be
  73  *                                    NULL if no parameters are being passed.
  74  *                  ParameterType   - Type of Parameter list
  75  *                  ReturnObject    - Where to put method's return value (if
  76  *                                    any). If NULL, no value is returned.
  77  *                  Flags           - ACPI_IGNORE_RETURN_VALUE to delete return
  78  *
  79  * RETURN:      Status
  80  *
  81  * DESCRIPTION: Execute a control method or return the current value of an
  82  *              ACPI namespace object.
  83  *
  84  * MUTEX:       Locks interpreter
  85  *
  86  ******************************************************************************/
  87
  88 ACPI_STATUS
  89 AcpiNsEvaluate (
  90     ACPI_EVALUATE_INFO      *Info)
  91 {
  92     ACPI_STATUS             Status;
  93
  94
  95     ACPI_FUNCTION_TRACE (NsEvaluate);
  96
  97
  98     if (!Info)
  99     {
 100         return_ACPI_STATUS (AE_BAD_PARAMETER);
 101     }
 102
 103     if (!Info->Node)
 104     {
 105         /*
 106          * Get the actual namespace node for the target object if we
 107          * need to. Handles these cases:
 108          *
 109          * 1) Null node, valid pathname from root (absolute path)
 110          * 2) Node and valid pathname (path relative to Node)
 111          * 3) Node, Null pathname
 112          */
 113         Status = AcpiNsGetNode (Info->PrefixNode, Info->RelativePathname,
 114             ACPI_NS_NO_UPSEARCH, &Info->Node);
 115         if (ACPI_FAILURE (Status))
 116         {
 117             return_ACPI_STATUS (Status);
 118         }
 119     }
 120
 121     /*
 122      * For a method alias, we must grab the actual method node so that
 123      * proper scoping context will be established before execution.
 124      */
 125     if (AcpiNsGetType (Info->Node) == ACPI_TYPE_LOCAL_METHOD_ALIAS)
 126     {
 127         Info->Node = ACPI_CAST_PTR (
 128             ACPI_NAMESPACE_NODE, Info->Node->Object);
 129     }
 130
 131     /* Complete the info block initialization */
 132
 133     Info->ReturnObject = NULL;
 134     Info->NodeFlags = Info->Node->Flags;
 135     Info->ObjDesc = AcpiNsGetAttachedObject (Info->Node);
 136
 137     ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, "%s [%p] Value %p\n",
 138         Info->RelativePathname, Info->Node,
 139         AcpiNsGetAttachedObject (Info->Node)));
 140
 141     /* Get info if we have a predefined name (_HID, etc.) */
 142
 143     Info->Predefined = AcpiUtMatchPredefinedMethod (Info->Node->Name.Ascii);
 144
 145     /* Get the full pathname to the object, for use in warning messages */
 146
 147     Info->FullPathname = AcpiNsGetNormalizedPathname (Info->Node, TRUE);
 148     if (!Info->FullPathname)
 149     {
 150         return_ACPI_STATUS (AE_NO_MEMORY);
 151     }
 152
 153     /* Count the number of arguments being passed in */
 154
 155     Info->ParamCount = 0;
 156     if (Info->Parameters)
 157     {
 158         while (Info->Parameters[Info->ParamCount])
 159         {
 160             Info->ParamCount++;
 161         }
 162
 163         /* Warn on impossible argument count */
 164
 165         if (Info->ParamCount > ACPI_METHOD_NUM_ARGS)
 166         {
 167             ACPI_WARN_PREDEFINED ((AE_INFO, Info->FullPathname, ACPI_WARN_ALWAYS,
 168                 "Excess arguments (%u) - using only %u",
 169                 Info->ParamCount, ACPI_METHOD_NUM_ARGS));
 170
 171             Info->ParamCount = ACPI_METHOD_NUM_ARGS;
 172         }
 173     }
 174
 175     /*
 176      * For predefined names: Check that the declared argument count
 177      * matches the ACPI spec -- otherwise this is a BIOS error.
 178      */
 179     AcpiNsCheckAcpiCompliance (Info->FullPathname, Info->Node,
 180         Info->Predefined);
 181
 182     /*
 183      * For all names: Check that the incoming argument count for
 184      * this method/object matches the actual ASL/AML definition.
 185      */
 186     AcpiNsCheckArgumentCount (Info->FullPathname, Info->Node,
 187         Info->ParamCount, Info->Predefined);
 188
 189     /* For predefined names: Typecheck all incoming arguments */
 190
 191     AcpiNsCheckArgumentTypes (Info);
 192
 193     /*
 194      * Three major evaluation cases:
 195      *
 196      * 1) Object types that cannot be evaluated by definition
 197      * 2) The object is a control method -- execute it
 198      * 3) The object is not a method -- just return it's current value
 199      */
 200     switch (AcpiNsGetType (Info->Node))
 201     {
 202     case ACPI_TYPE_DEVICE:
 203     case ACPI_TYPE_EVENT:
 204     case ACPI_TYPE_MUTEX:
 205     case ACPI_TYPE_REGION:
 206     case ACPI_TYPE_THERMAL:
 207     case ACPI_TYPE_LOCAL_SCOPE:
 208         /*
 209          * 1) Disallow evaluation of certain object types. For these,
 210          *    object evaluation is undefined and not supported.
 211          */
 212         ACPI_ERROR ((AE_INFO,
 213             "%s: Evaluation of object type [%s] is not supported",
 214             Info->FullPathname,
 215             AcpiUtGetTypeName (Info->Node->Type)));
 216
 217         Status = AE_TYPE;
 218         goto Cleanup;
 219
 220     case ACPI_TYPE_METHOD:
 221         /*
 222          * 2) Object is a control method - execute it
 223          */
 224
 225         /* Verify that there is a method object associated with this node */
 226
 227         if (!Info->ObjDesc)
 228         {
 229             ACPI_ERROR ((AE_INFO, "%s: Method has no attached sub-object",
 230                 Info->FullPathname));
 231             Status = AE_NULL_OBJECT;
 232             goto Cleanup;
 233         }
 234
 235         ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
 236             "**** Execute method [%s] at AML address %p length %X\n",
 237             Info->FullPathname,
 238             Info->ObjDesc->Method.AmlStart + 1,
 239             Info->ObjDesc->Method.AmlLength - 1));
 240
 241         /*
 242          * Any namespace deletion must acquire both the namespace and
 243          * interpreter locks to ensure that no thread is using the portion of
 244          * the namespace that is being deleted.
 245          *
 246          * Execute the method via the interpreter. The interpreter is locked
 247          * here before calling into the AML parser
 248          */
 249         AcpiExEnterInterpreter ();
 250         Status = AcpiPsExecuteMethod (Info);
 251         AcpiExExitInterpreter ();
 252         break;
 253
 254     default:
 255         /*
 256          * 3) All other non-method objects -- get the current object value
 257          */
 258
 259         /*
 260          * Some objects require additional resolution steps (e.g., the Node
 261          * may be a field that must be read, etc.) -- we can't just grab
 262          * the object out of the node.
 263          *
 264          * Use ResolveNodeToValue() to get the associated value.
 265          *
 266          * NOTE: we can get away with passing in NULL for a walk state because
 267          * the Node is guaranteed to not be a reference to either a method
 268          * local or a method argument (because this interface is never called
 269          * from a running method.)
 270          *
 271          * Even though we do not directly invoke the interpreter for object
 272          * resolution, we must lock it because we could access an OpRegion.
 273          * The OpRegion access code assumes that the interpreter is locked.
 274          */
 275         AcpiExEnterInterpreter ();
 276
 277         /* TBD: ResolveNodeToValue has a strange interface, fix */
 278
 279         Info->ReturnObject = ACPI_CAST_PTR (ACPI_OPERAND_OBJECT, Info->Node);
 280
 281         Status = AcpiExResolveNodeToValue (ACPI_CAST_INDIRECT_PTR (
 282             ACPI_NAMESPACE_NODE, &Info->ReturnObject), NULL);
 283         AcpiExExitInterpreter ();
 284
 285         if (ACPI_FAILURE (Status))
 286         {
 287             Info->ReturnObject = NULL;
 288             goto Cleanup;
 289         }
 290
 291         ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, "Returned object %p [%s]\n",
 292             Info->ReturnObject,
 293             AcpiUtGetObjectTypeName (Info->ReturnObject)));
 294
 295         Status = AE_CTRL_RETURN_VALUE; /* Always has a "return value" */
 296         break;
 297     }
 298
 299     /*
 300      * For predefined names, check the return value against the ACPI
 301      * specification. Some incorrect return value types are repaired.
 302      */
 303     (void) AcpiNsCheckReturnValue (Info->Node, Info, Info->ParamCount,
 304         Status, &Info->ReturnObject);
 305
 306     /* Check if there is a return value that must be dealt with */
 307
 308     if (Status == AE_CTRL_RETURN_VALUE)
 309     {
 310         /* If caller does not want the return value, delete it */
 311
 312         if (Info->Flags & ACPI_IGNORE_RETURN_VALUE)
 313         {
 314             AcpiUtRemoveReference (Info->ReturnObject);
 315             Info->ReturnObject = NULL;
 316         }
 317
 318         /* Map AE_CTRL_RETURN_VALUE to AE_OK, we are done with it */
 319
 320         Status = AE_OK;
 321     }
 322
 323     ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
 324         "*** Completed evaluation of object %s ***\n",
 325         Info->RelativePathname));
 326
 327 Cleanup:
 328     /*
 329      * Namespace was unlocked by the handling AcpiNs* function, so we
 330      * just free the pathname and return
 331      */
 332     ACPI_FREE (Info->FullPathname);
 333     Info->FullPathname = NULL;
 334     return_ACPI_STATUS (Status);
 335 }
 336
 337
 338 /*******************************************************************************
 339  *
 340  * FUNCTION:    AcpiNsExecModuleCodeList
 341  *
 342  * PARAMETERS:  None
 343  *
 344  * RETURN:      None. Exceptions during method execution are ignored, since
 345  *              we cannot abort a table load.
 346  *
 347  * DESCRIPTION: Execute all elements of the global module-level code list.
 348  *              Each element is executed as a single control method.
 349  *
 350  ******************************************************************************/
 351
 352 void
 353 AcpiNsExecModuleCodeList (
 354     void)
 355 {
 356     ACPI_OPERAND_OBJECT     *Prev;
 357     ACPI_OPERAND_OBJECT     *Next;
 358     ACPI_EVALUATE_INFO      *Info;
 359     UINT32                  MethodCount = 0;
 360
 361
 362     ACPI_FUNCTION_TRACE (NsExecModuleCodeList);
 363
 364
 365     /* Exit now if the list is empty */
 366
 367     Next = AcpiGbl_ModuleCodeList;
 368     if (!Next)
 369     {
 370         return_VOID;
 371     }
 372
 373     /* Allocate the evaluation information block */
 374
 375     Info = ACPI_ALLOCATE (sizeof (ACPI_EVALUATE_INFO));
 376     if (!Info)
 377     {
 378         return_VOID;
 379     }
 380
 381     /* Walk the list, executing each "method" */
 382
 383     while (Next)
 384     {
 385         Prev = Next;
 386         Next = Next->Method.Mutex;
 387
 388         /* Clear the link field and execute the method */
 389
 390         Prev->Method.Mutex = NULL;
 391         AcpiNsExecModuleCode (Prev, Info);
 392         MethodCount++;
 393
 394         /* Delete the (temporary) method object */
 395
 396         AcpiUtRemoveReference (Prev);
 397     }
 398
 399     ACPI_INFO ((AE_INFO,
 400         "Executed %u blocks of module-level executable AML code",
 401         MethodCount));
 402
 403     ACPI_FREE (Info);
 404     AcpiGbl_ModuleCodeList = NULL;
 405     return_VOID;
 406 }
 407
 408
 409 /*******************************************************************************
 410  *
 411  * FUNCTION:    AcpiNsExecModuleCode
 412  *
 413  * PARAMETERS:  MethodObj           - Object container for the module-level code
 414  *              Info                - Info block for method evaluation
 415  *
 416  * RETURN:      None. Exceptions during method execution are ignored, since
 417  *              we cannot abort a table load.
 418  *
 419  * DESCRIPTION: Execute a control method containing a block of module-level
 420  *              executable AML code. The control method is temporarily
 421  *              installed to the root node, then evaluated.
 422  *
 423  ******************************************************************************/
 424
 425 static void
 426 AcpiNsExecModuleCode (
 427     ACPI_OPERAND_OBJECT     *MethodObj,
 428     ACPI_EVALUATE_INFO      *Info)
 429 {
 430     ACPI_OPERAND_OBJECT     *ParentObj;
 431     ACPI_NAMESPACE_NODE     *ParentNode;
 432     ACPI_OBJECT_TYPE        Type;
 433     ACPI_STATUS             Status;
 434
 435
 436     ACPI_FUNCTION_TRACE (NsExecModuleCode);
 437
 438
 439     /*
 440      * Get the parent node. We cheat by using the NextObject field
 441      * of the method object descriptor.
 442      */
 443     ParentNode = ACPI_CAST_PTR (
 444         ACPI_NAMESPACE_NODE, MethodObj->Method.NextObject);
 445     Type = AcpiNsGetType (ParentNode);
 446
 447     /*
 448      * Get the region handler and save it in the method object. We may need
 449      * this if an operation region declaration causes a _REG method to be run.
 450      *
 451      * We can't do this in AcpiPsLinkModuleCode because
 452      * AcpiGbl_RootNode->Object is NULL at PASS1.
 453      */
 454     if ((Type == ACPI_TYPE_DEVICE) && ParentNode->Object)
 455     {
 456         MethodObj->Method.Dispatch.Handler =
 457             ParentNode->Object->Device.Handler;
 458     }
 459
 460     /* Must clear NextObject (AcpiNsAttachObject needs the field) */
 461
 462     MethodObj->Method.NextObject = NULL;
 463
 464     /* Initialize the evaluation information block */
 465
 466     memset (Info, 0, sizeof (ACPI_EVALUATE_INFO));
 467     Info->PrefixNode = ParentNode;
 468
 469     /*
 470      * Get the currently attached parent object. Add a reference,
 471      * because the ref count will be decreased when the method object
 472      * is installed to the parent node.
 473      */
 474     ParentObj = AcpiNsGetAttachedObject (ParentNode);
 475     if (ParentObj)
 476     {
 477         AcpiUtAddReference (ParentObj);
 478     }
 479
 480     /* Install the method (module-level code) in the parent node */
 481
 482     Status = AcpiNsAttachObject (ParentNode, MethodObj, ACPI_TYPE_METHOD);
 483     if (ACPI_FAILURE (Status))
 484     {
 485         goto Exit;
 486     }
 487
 488     /* Execute the parent node as a control method */
 489
 490     Status = AcpiNsEvaluate (Info);
 491
 492     ACPI_DEBUG_PRINT ((ACPI_DB_INIT_NAMES,
 493         "Executed module-level code at %p\n",
 494         MethodObj->Method.AmlStart));
 495
 496     /* Delete a possible implicit return value (in slack mode) */
 497
 498     if (Info->ReturnObject)
 499     {
 500         AcpiUtRemoveReference (Info->ReturnObject);
 501     }
 502
 503     /* Detach the temporary method object */
 504
 505     AcpiNsDetachObject (ParentNode);
 506
 507     /* Restore the original parent object */
 508
 509     if (ParentObj)
 510     {
 511         Status = AcpiNsAttachObject (ParentNode, ParentObj, Type);
 512     }
 513     else
 514     {
 515         ParentNode->Type = (UINT8) Type;
 516     }
 517
 518 Exit:
 519     if (ParentObj)
 520     {
 521         AcpiUtRemoveReference (ParentObj);
 522     }
 523     return_VOID;
 524 }