arch/all-pc/acpica/source/components/namespace/nseval.c

   1 /*******************************************************************************
   2  *
   3  * Module Name: nseval - Object evaluation, includes control method execution
   4  *
   5  ******************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2013, 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 #define __NSEVAL_C__
  45
  46 #include "acpi.h"
  47 #include "accommon.h"
  48 #include "acparser.h"
  49 #include "acinterp.h"
  50 #include "acnamesp.h"
  51
  52
  53 #define _COMPONENT          ACPI_NAMESPACE
  54         ACPI_MODULE_NAME    ("nseval")
  55
  56 /* Local prototypes */
  57
  58 static void
  59 AcpiNsExecModuleCode (
  60     ACPI_OPERAND_OBJECT     *MethodObj,
  61     ACPI_EVALUATE_INFO      *Info);
  62
  63
  64 /*******************************************************************************
  65  *
  66  * FUNCTION:    AcpiNsEvaluate
  67  *
  68  * PARAMETERS:  Info            - Evaluation info block, contains:
  69  *                  PrefixNode      - Prefix or Method/Object Node to execute
  70  *                  RelativePath    - Name of method to execute, If NULL, the
  71  *                                    Node is the object to execute
  72  *                  Parameters      - List of parameters to pass to the method,
  73  *                                    terminated by NULL. Params itself may be
  74  *                                    NULL if no parameters are being passed.
  75  *                  ReturnObject    - Where to put method's return value (if
  76  *                                    any). If NULL, no value is returned.
  77  *                  ParameterType   - Type of Parameter list
  78  *                  ReturnObject    - Where to put method's return value (if
  79  *                                    any). If NULL, no value is returned.
  80  *                  Flags           - ACPI_IGNORE_RETURN_VALUE to delete return
  81  *
  82  * RETURN:      Status
  83  *
  84  * DESCRIPTION: Execute a control method or return the current value of an
  85  *              ACPI namespace object.
  86  *
  87  * MUTEX:       Locks interpreter
  88  *
  89  ******************************************************************************/
  90
  91 ACPI_STATUS
  92 AcpiNsEvaluate (
  93     ACPI_EVALUATE_INFO      *Info)
  94 {
  95     ACPI_STATUS             Status;
  96
  97
  98     ACPI_FUNCTION_TRACE (NsEvaluate);
  99
 100
 101     if (!Info)
 102     {
 103         return_ACPI_STATUS (AE_BAD_PARAMETER);
 104     }
 105
 106     if (!Info->Node)
 107     {
 108         /*
 109          * Get the actual namespace node for the target object if we
 110          * need to. Handles these cases:
 111          *
 112          * 1) Null node, valid pathname from root (absolute path)
 113          * 2) Node and valid pathname (path relative to Node)
 114          * 3) Node, Null pathname
 115          */
 116         Status = AcpiNsGetNode (Info->PrefixNode, Info->RelativePathname,
 117             ACPI_NS_NO_UPSEARCH, &Info->Node);
 118         if (ACPI_FAILURE (Status))
 119         {
 120             return_ACPI_STATUS (Status);
 121         }
 122     }
 123
 124     /*
 125      * For a method alias, we must grab the actual method node so that
 126      * proper scoping context will be established before execution.
 127      */
 128     if (AcpiNsGetType (Info->Node) == ACPI_TYPE_LOCAL_METHOD_ALIAS)
 129     {
 130         Info->Node = ACPI_CAST_PTR (
 131             ACPI_NAMESPACE_NODE, Info->Node->Object);
 132     }
 133
 134     /* Complete the info block initialization */
 135
 136     Info->ReturnObject = NULL;
 137     Info->NodeFlags = Info->Node->Flags;
 138     Info->ObjDesc = AcpiNsGetAttachedObject (Info->Node);
 139
 140     ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, "%s [%p] Value %p\n",
 141         Info->RelativePathname, Info->Node,
 142         AcpiNsGetAttachedObject (Info->Node)));
 143
 144     /* Get info if we have a predefined name (_HID, etc.) */
 145
 146     Info->Predefined = AcpiUtMatchPredefinedMethod (Info->Node->Name.Ascii);
 147
 148     /* Get the full pathname to the object, for use in warning messages */
 149
 150     Info->FullPathname = AcpiNsGetExternalPathname (Info->Node);
 151     if (!Info->FullPathname)
 152     {
 153         return_ACPI_STATUS (AE_NO_MEMORY);
 154     }
 155
 156     /* Count the number of arguments being passed in */
 157
 158     Info->ParamCount = 0;
 159     if (Info->Parameters)
 160     {
 161         while (Info->Parameters[Info->ParamCount])
 162         {
 163             Info->ParamCount++;
 164         }
 165
 166         /* Warn on impossible argument count */
 167
 168         if (Info->ParamCount > ACPI_METHOD_NUM_ARGS)
 169         {
 170             ACPI_WARN_PREDEFINED ((AE_INFO, Info->FullPathname, ACPI_WARN_ALWAYS,
 171                 "Excess arguments (%u) - using only %u",
 172                 Info->ParamCount, ACPI_METHOD_NUM_ARGS));
 173
 174             Info->ParamCount = ACPI_METHOD_NUM_ARGS;
 175         }
 176     }
 177
 178     /*
 179      * For predefined names: Check that the declared argument count
 180      * matches the ACPI spec -- otherwise this is a BIOS error.
 181      */
 182     AcpiNsCheckAcpiCompliance (Info->FullPathname, Info->Node,
 183         Info->Predefined);
 184
 185     /*
 186      * For all names: Check that the incoming argument count for
 187      * this method/object matches the actual ASL/AML definition.
 188      */
 189     AcpiNsCheckArgumentCount (Info->FullPathname, Info->Node,
 190         Info->ParamCount, Info->Predefined);
 191
 192     /* For predefined names: Typecheck all incoming arguments */
 193
 194     AcpiNsCheckArgumentTypes (Info);
 195
 196     /*
 197      * Three major evaluation cases:
 198      *
 199      * 1) Object types that cannot be evaluated by definition
 200      * 2) The object is a control method -- execute it
 201      * 3) The object is not a method -- just return it's current value
 202      */
 203     switch (AcpiNsGetType (Info->Node))
 204     {
 205     case ACPI_TYPE_DEVICE:
 206     case ACPI_TYPE_EVENT:
 207     case ACPI_TYPE_MUTEX:
 208     case ACPI_TYPE_REGION:
 209     case ACPI_TYPE_THERMAL:
 210     case ACPI_TYPE_LOCAL_SCOPE:
 211         /*
 212          * 1) Disallow evaluation of certain object types. For these,
 213          *    object evaluation is undefined and not supported.
 214          */
 215         ACPI_ERROR ((AE_INFO,
 216             "%s: Evaluation of object type [%s] is not supported",
 217             Info->FullPathname,
 218             AcpiUtGetTypeName (Info->Node->Type)));
 219
 220         Status = AE_TYPE;
 221         goto Cleanup;
 222
 223     case ACPI_TYPE_METHOD:
 224         /*
 225          * 2) Object is a control method - execute it
 226          */
 227
 228         /* Verify that there is a method object associated with this node */
 229
 230         if (!Info->ObjDesc)
 231         {
 232             ACPI_ERROR ((AE_INFO, "%s: Method has no attached sub-object",
 233                 Info->FullPathname));
 234             Status = AE_NULL_OBJECT;
 235             goto Cleanup;
 236         }
 237
 238         ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
 239             "**** Execute method [%s] at AML address %p length %X\n",
 240             Info->FullPathname,
 241             Info->ObjDesc->Method.AmlStart + 1,
 242             Info->ObjDesc->Method.AmlLength - 1));
 243
 244         /*
 245          * Any namespace deletion must acquire both the namespace and
 246          * interpreter locks to ensure that no thread is using the portion of
 247          * the namespace that is being deleted.
 248          *
 249          * Execute the method via the interpreter. The interpreter is locked
 250          * here before calling into the AML parser
 251          */
 252         AcpiExEnterInterpreter ();
 253         Status = AcpiPsExecuteMethod (Info);
 254         AcpiExExitInterpreter ();
 255         break;
 256
 257     default:
 258         /*
 259          * 3) All other non-method objects -- get the current object value
 260          */
 261
 262         /*
 263          * Some objects require additional resolution steps (e.g., the Node
 264          * may be a field that must be read, etc.) -- we can't just grab
 265          * the object out of the node.
 266          *
 267          * Use ResolveNodeToValue() to get the associated value.
 268          *
 269          * NOTE: we can get away with passing in NULL for a walk state because
 270          * the Node is guaranteed to not be a reference to either a method
 271          * local or a method argument (because this interface is never called
 272          * from a running method.)
 273          *
 274          * Even though we do not directly invoke the interpreter for object
 275          * resolution, we must lock it because we could access an OpRegion.
 276          * The OpRegion access code assumes that the interpreter is locked.
 277          */
 278         AcpiExEnterInterpreter ();
 279
 280         /* TBD: ResolveNodeToValue has a strange interface, fix */
 281
 282         Info->ReturnObject = ACPI_CAST_PTR (ACPI_OPERAND_OBJECT, Info->Node);
 283
 284         Status = AcpiExResolveNodeToValue (ACPI_CAST_INDIRECT_PTR (
 285             ACPI_NAMESPACE_NODE, &Info->ReturnObject), NULL);
 286         AcpiExExitInterpreter ();
 287
 288         if (ACPI_FAILURE (Status))
 289         {
 290             goto Cleanup;
 291         }
 292
 293         ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, "Returned object %p [%s]\n",
 294             Info->ReturnObject,
 295             AcpiUtGetObjectTypeName (Info->ReturnObject)));
 296
 297         Status = AE_CTRL_RETURN_VALUE; /* Always has a "return value" */
 298         break;
 299     }
 300
 301     /*
 302      * For predefined names, check the return value against the ACPI
 303      * specification. Some incorrect return value types are repaired.
 304      */
 305     (void) AcpiNsCheckReturnValue (Info->Node, Info, Info->ParamCount,
 306         Status, &Info->ReturnObject);
 307
 308     /* Check if there is a return value that must be dealt with */
 309
 310     if (Status == AE_CTRL_RETURN_VALUE)
 311     {
 312         /* If caller does not want the return value, delete it */
 313
 314         if (Info->Flags & ACPI_IGNORE_RETURN_VALUE)
 315         {
 316             AcpiUtRemoveReference (Info->ReturnObject);
 317             Info->ReturnObject = NULL;
 318         }
 319
 320         /* Map AE_CTRL_RETURN_VALUE to AE_OK, we are done with it */
 321
 322         Status = AE_OK;
 323     }
 324
 325     ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
 326         "*** Completed evaluation of object %s ***\n",
 327         Info->RelativePathname));
 328
 329 Cleanup:
 330     /*
 331      * Namespace was unlocked by the handling AcpiNs* function, so we
 332      * just free the pathname and return
 333      */
 334     ACPI_FREE (Info->FullPathname);
 335     Info->FullPathname = NULL;
 336     return_ACPI_STATUS (Status);
 337 }
 338
 339
 340 /*******************************************************************************
 341  *
 342  * FUNCTION:    AcpiNsExecModuleCodeList
 343  *
 344  * PARAMETERS:  None
 345  *
 346  * RETURN:      None. Exceptions during method execution are ignored, since
 347  *              we cannot abort a table load.
 348  *
 349  * DESCRIPTION: Execute all elements of the global module-level code list.
 350  *              Each element is executed as a single control method.
 351  *
 352  ******************************************************************************/
 353
 354 void
 355 AcpiNsExecModuleCodeList (
 356     void)
 357 {
 358     ACPI_OPERAND_OBJECT     *Prev;
 359     ACPI_OPERAND_OBJECT     *Next;
 360     ACPI_EVALUATE_INFO      *Info;
 361     UINT32                  MethodCount = 0;
 362
 363
 364     ACPI_FUNCTION_TRACE (NsExecModuleCodeList);
 365
 366
 367     /* Exit now if the list is empty */
 368
 369     Next = AcpiGbl_ModuleCodeList;
 370     if (!Next)
 371     {
 372         return_VOID;
 373     }
 374
 375     /* Allocate the evaluation information block */
 376
 377     Info = ACPI_ALLOCATE (sizeof (ACPI_EVALUATE_INFO));
 378     if (!Info)
 379     {
 380         return_VOID;
 381     }
 382
 383     /* Walk the list, executing each "method" */
 384
 385     while (Next)
 386     {
 387         Prev = Next;
 388         Next = Next->Method.Mutex;
 389
 390         /* Clear the link field and execute the method */
 391
 392         Prev->Method.Mutex = NULL;
 393         AcpiNsExecModuleCode (Prev, Info);
 394         MethodCount++;
 395
 396         /* Delete the (temporary) method object */
 397
 398         AcpiUtRemoveReference (Prev);
 399     }
 400
 401     ACPI_INFO ((AE_INFO,
 402         "Executed %u blocks of module-level executable AML code",
 403         MethodCount));
 404
 405     ACPI_FREE (Info);
 406     AcpiGbl_ModuleCodeList = NULL;
 407     return_VOID;
 408 }
 409
 410
 411 /*******************************************************************************
 412  *
 413  * FUNCTION:    AcpiNsExecModuleCode
 414  *
 415  * PARAMETERS:  MethodObj           - Object container for the module-level code
 416  *              Info                - Info block for method evaluation
 417  *
 418  * RETURN:      None. Exceptions during method execution are ignored, since
 419  *              we cannot abort a table load.
 420  *
 421  * DESCRIPTION: Execute a control method containing a block of module-level
 422  *              executable AML code. The control method is temporarily
 423  *              installed to the root node, then evaluated.
 424  *
 425  ******************************************************************************/
 426
 427 static void
 428 AcpiNsExecModuleCode (
 429     ACPI_OPERAND_OBJECT     *MethodObj,
 430     ACPI_EVALUATE_INFO      *Info)
 431 {
 432     ACPI_OPERAND_OBJECT     *ParentObj;
 433     ACPI_NAMESPACE_NODE     *ParentNode;
 434     ACPI_OBJECT_TYPE        Type;
 435     ACPI_STATUS             Status;
 436
 437
 438     ACPI_FUNCTION_TRACE (NsExecModuleCode);
 439
 440
 441     /*
 442      * Get the parent node. We cheat by using the NextObject field
 443      * of the method object descriptor.
 444      */
 445     ParentNode = ACPI_CAST_PTR (ACPI_NAMESPACE_NODE,
 446                     MethodObj->Method.NextObject);
 447     Type = AcpiNsGetType (ParentNode);
 448
 449     /*
 450      * Get the region handler and save it in the method object. We may need
 451      * this if an operation region declaration causes a _REG method to be run.
 452      *
 453      * We can't do this in AcpiPsLinkModuleCode because
 454      * AcpiGbl_RootNode->Object is NULL at PASS1.
 455      */
 456     if ((Type == ACPI_TYPE_DEVICE) && ParentNode->Object)
 457     {
 458         MethodObj->Method.Dispatch.Handler =
 459             ParentNode->Object->Device.Handler;
 460     }
 461
 462     /* Must clear NextObject (AcpiNsAttachObject needs the field) */
 463
 464     MethodObj->Method.NextObject = NULL;
 465
 466     /* Initialize the evaluation information block */
 467
 468     ACPI_MEMSET (Info, 0, sizeof (ACPI_EVALUATE_INFO));
 469     Info->PrefixNode = ParentNode;
 470
 471     /*
 472      * Get the currently attached parent object. Add a reference, because the
 473      * ref count will be decreased when the method object is installed to
 474      * the parent node.
 475      */
 476     ParentObj = AcpiNsGetAttachedObject (ParentNode);
 477     if (ParentObj)
 478     {
 479         AcpiUtAddReference (ParentObj);
 480     }
 481
 482     /* Install the method (module-level code) in the parent node */
 483
 484     Status = AcpiNsAttachObject (ParentNode, MethodObj,
 485                 ACPI_TYPE_METHOD);
 486     if (ACPI_FAILURE (Status))
 487     {
 488         goto Exit;
 489     }
 490
 491     /* Execute the parent node as a control method */
 492
 493     Status = AcpiNsEvaluate (Info);
 494
 495     ACPI_DEBUG_PRINT ((ACPI_DB_INIT, "Executed module-level code at %p\n",
 496         MethodObj->Method.AmlStart));
 497
 498     /* Delete a possible implicit return value (in slack mode) */
 499
 500     if (Info->ReturnObject)
 501     {
 502         AcpiUtRemoveReference (Info->ReturnObject);
 503     }
 504
 505     /* Detach the temporary method object */
 506
 507     AcpiNsDetachObject (ParentNode);
 508
 509     /* Restore the original parent object */
 510
 511     if (ParentObj)
 512     {
 513         Status = AcpiNsAttachObject (ParentNode, ParentObj, Type);
 514     }
 515     else
 516     {
 517         ParentNode->Type = (UINT8) Type;
 518     }
 519
 520 Exit:
 521     if (ParentObj)
 522     {
 523         AcpiUtRemoveReference (ParentObj);
 524     }
 525     return_VOID;
 526 }