drivers/bus/acpi/acpica/executer/exresolv.c

   1 /******************************************************************************
   2  *
   3  * Module Name: exresolv - AML Interpreter object resolution
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2018, 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 "amlcode.h"
  47 #include "acdispat.h"
  48 #include "acinterp.h"
  49 #include "acnamesp.h"
  50
  51
  52 #define _COMPONENT          ACPI_EXECUTER
  53         ACPI_MODULE_NAME    ("exresolv")
  54
  55 /* Local prototypes */
  56
  57 static ACPI_STATUS
  58 AcpiExResolveObjectToValue (
  59     ACPI_OPERAND_OBJECT     **StackPtr,
  60     ACPI_WALK_STATE         *WalkState);
  61
  62
  63 /*******************************************************************************
  64  *
  65  * FUNCTION:    AcpiExResolveToValue
  66  *
  67  * PARAMETERS:  **StackPtr          - Points to entry on ObjStack, which can
  68  *                                    be either an (ACPI_OPERAND_OBJECT *)
  69  *                                    or an ACPI_HANDLE.
  70  *              WalkState           - Current method state
  71  *
  72  * RETURN:      Status
  73  *
  74  * DESCRIPTION: Convert Reference objects to values
  75  *
  76  ******************************************************************************/
  77
  78 ACPI_STATUS
  79 AcpiExResolveToValue (
  80     ACPI_OPERAND_OBJECT     **StackPtr,
  81     ACPI_WALK_STATE         *WalkState)
  82 {
  83     ACPI_STATUS             Status;
  84
  85
  86     ACPI_FUNCTION_TRACE_PTR (ExResolveToValue, StackPtr);
  87
  88
  89     if (!StackPtr || !*StackPtr)
  90     {
  91         ACPI_ERROR ((AE_INFO, "Internal - null pointer"));
  92         return_ACPI_STATUS (AE_AML_NO_OPERAND);
  93     }
  94
  95     /*
  96      * The entity pointed to by the StackPtr can be either
  97      * 1) A valid ACPI_OPERAND_OBJECT, or
  98      * 2) A ACPI_NAMESPACE_NODE (NamedObj)
  99      */
 100     if (ACPI_GET_DESCRIPTOR_TYPE (*StackPtr) == ACPI_DESC_TYPE_OPERAND)
 101     {
 102         Status = AcpiExResolveObjectToValue (StackPtr, WalkState);
 103         if (ACPI_FAILURE (Status))
 104         {
 105             return_ACPI_STATUS (Status);
 106         }
 107
 108         if (!*StackPtr)
 109         {
 110             ACPI_ERROR ((AE_INFO, "Internal - null pointer"));
 111             return_ACPI_STATUS (AE_AML_NO_OPERAND);
 112         }
 113     }
 114
 115     /*
 116      * Object on the stack may have changed if AcpiExResolveObjectToValue()
 117      * was called (i.e., we can't use an _else_ here.)
 118      */
 119     if (ACPI_GET_DESCRIPTOR_TYPE (*StackPtr) == ACPI_DESC_TYPE_NAMED)
 120     {
 121         Status = AcpiExResolveNodeToValue (
 122             ACPI_CAST_INDIRECT_PTR (ACPI_NAMESPACE_NODE, StackPtr),
 123             WalkState);
 124         if (ACPI_FAILURE (Status))
 125         {
 126             return_ACPI_STATUS (Status);
 127         }
 128     }
 129
 130     ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Resolved object %p\n", *StackPtr));
 131     return_ACPI_STATUS (AE_OK);
 132 }
 133
 134
 135 /*******************************************************************************
 136  *
 137  * FUNCTION:    AcpiExResolveObjectToValue
 138  *
 139  * PARAMETERS:  StackPtr        - Pointer to an internal object
 140  *              WalkState       - Current method state
 141  *
 142  * RETURN:      Status
 143  *
 144  * DESCRIPTION: Retrieve the value from an internal object. The Reference type
 145  *              uses the associated AML opcode to determine the value.
 146  *
 147  ******************************************************************************/
 148
 149 static ACPI_STATUS
 150 AcpiExResolveObjectToValue (
 151     ACPI_OPERAND_OBJECT     **StackPtr,
 152     ACPI_WALK_STATE         *WalkState)
 153 {
 154     ACPI_STATUS             Status = AE_OK;
 155     ACPI_OPERAND_OBJECT     *StackDesc;
 156     ACPI_OPERAND_OBJECT     *ObjDesc = NULL;
 157     UINT8                   RefType;
 158
 159
 160     ACPI_FUNCTION_TRACE (ExResolveObjectToValue);
 161
 162
 163     StackDesc = *StackPtr;
 164
 165     /* This is an object of type ACPI_OPERAND_OBJECT */
 166
 167     switch (StackDesc->Common.Type)
 168     {
 169     case ACPI_TYPE_LOCAL_REFERENCE:
 170
 171         RefType = StackDesc->Reference.Class;
 172
 173         switch (RefType)
 174         {
 175         case ACPI_REFCLASS_LOCAL:
 176         case ACPI_REFCLASS_ARG:
 177             /*
 178              * Get the local from the method's state info
 179              * Note: this increments the local's object reference count
 180              */
 181             Status = AcpiDsMethodDataGetValue (RefType,
 182                 StackDesc->Reference.Value, WalkState, &ObjDesc);
 183             if (ACPI_FAILURE (Status))
 184             {
 185                 return_ACPI_STATUS (Status);
 186             }
 187
 188             ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "[Arg/Local %X] ValueObj is %p\n",
 189                 StackDesc->Reference.Value, ObjDesc));
 190
 191             /*
 192              * Now we can delete the original Reference Object and
 193              * replace it with the resolved value
 194              */
 195             AcpiUtRemoveReference (StackDesc);
 196             *StackPtr = ObjDesc;
 197             break;
 198
 199         case ACPI_REFCLASS_INDEX:
 200
 201             switch (StackDesc->Reference.TargetType)
 202             {
 203             case ACPI_TYPE_BUFFER_FIELD:
 204
 205                 /* Just return - do not dereference */
 206                 break;
 207
 208             case ACPI_TYPE_PACKAGE:
 209
 210                 /* If method call or CopyObject - do not dereference */
 211
 212                 if ((WalkState->Opcode == AML_INT_METHODCALL_OP) ||
 213                     (WalkState->Opcode == AML_COPY_OBJECT_OP))
 214                 {
 215                     break;
 216                 }
 217
 218                 /* Otherwise, dereference the PackageIndex to a package element */
 219
 220                 ObjDesc = *StackDesc->Reference.Where;
 221                 if (ObjDesc)
 222                 {
 223                     /*
 224                      * Valid object descriptor, copy pointer to return value
 225                      * (i.e., dereference the package index)
 226                      * Delete the ref object, increment the returned object
 227                      */
 228                     AcpiUtAddReference (ObjDesc);
 229                     *StackPtr = ObjDesc;
 230                 }
 231                 else
 232                 {
 233                     /*
 234                      * A NULL object descriptor means an uninitialized element of
 235                      * the package, can't dereference it
 236                      */
 237                     ACPI_ERROR ((AE_INFO,
 238                         "Attempt to dereference an Index to "
 239                         "NULL package element Idx=%p",
 240                         StackDesc));
 241                     Status = AE_AML_UNINITIALIZED_ELEMENT;
 242                 }
 243                 break;
 244
 245             default:
 246
 247                 /* Invalid reference object */
 248
 249                 ACPI_ERROR ((AE_INFO,
 250                     "Unknown TargetType 0x%X in Index/Reference object %p",
 251                     StackDesc->Reference.TargetType, StackDesc));
 252                 Status = AE_AML_INTERNAL;
 253                 break;
 254             }
 255             break;
 256
 257         case ACPI_REFCLASS_REFOF:
 258         case ACPI_REFCLASS_DEBUG:
 259         case ACPI_REFCLASS_TABLE:
 260
 261             /* Just leave the object as-is, do not dereference */
 262
 263             break;
 264
 265         case ACPI_REFCLASS_NAME:   /* Reference to a named object */
 266
 267             /* Dereference the name */
 268
 269             if ((StackDesc->Reference.Node->Type == ACPI_TYPE_DEVICE) ||
 270                 (StackDesc->Reference.Node->Type == ACPI_TYPE_THERMAL))
 271             {
 272                 /* These node types do not have 'real' subobjects */
 273
 274                 *StackPtr = (void *) StackDesc->Reference.Node;
 275             }
 276             else
 277             {
 278                 /* Get the object pointed to by the namespace node */
 279
 280                 *StackPtr = (StackDesc->Reference.Node)->Object;
 281                 AcpiUtAddReference (*StackPtr);
 282             }
 283
 284             AcpiUtRemoveReference (StackDesc);
 285             break;
 286
 287         default:
 288
 289             ACPI_ERROR ((AE_INFO,
 290                 "Unknown Reference type 0x%X in %p",
 291                 RefType, StackDesc));
 292             Status = AE_AML_INTERNAL;
 293             break;
 294         }
 295         break;
 296
 297     case ACPI_TYPE_BUFFER:
 298
 299         Status = AcpiDsGetBufferArguments (StackDesc);
 300         break;
 301
 302     case ACPI_TYPE_PACKAGE:
 303
 304         Status = AcpiDsGetPackageArguments (StackDesc);
 305         break;
 306
 307     case ACPI_TYPE_BUFFER_FIELD:
 308     case ACPI_TYPE_LOCAL_REGION_FIELD:
 309     case ACPI_TYPE_LOCAL_BANK_FIELD:
 310     case ACPI_TYPE_LOCAL_INDEX_FIELD:
 311
 312         ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
 313             "FieldRead SourceDesc=%p Type=%X\n",
 314             StackDesc, StackDesc->Common.Type));
 315
 316         Status = AcpiExReadDataFromField (WalkState, StackDesc, &ObjDesc);
 317
 318         /* Remove a reference to the original operand, then override */
 319
 320         AcpiUtRemoveReference (*StackPtr);
 321         *StackPtr = (void *) ObjDesc;
 322         break;
 323
 324     default:
 325
 326         break;
 327     }
 328
 329     return_ACPI_STATUS (Status);
 330 }
 331
 332
 333 /*******************************************************************************
 334  *
 335  * FUNCTION:    AcpiExResolveMultiple
 336  *
 337  * PARAMETERS:  WalkState           - Current state (contains AML opcode)
 338  *              Operand             - Starting point for resolution
 339  *              ReturnType          - Where the object type is returned
 340  *              ReturnDesc          - Where the resolved object is returned
 341  *
 342  * RETURN:      Status
 343  *
 344  * DESCRIPTION: Return the base object and type. Traverse a reference list if
 345  *              necessary to get to the base object.
 346  *
 347  ******************************************************************************/
 348
 349 ACPI_STATUS
 350 AcpiExResolveMultiple (
 351     ACPI_WALK_STATE         *WalkState,
 352     ACPI_OPERAND_OBJECT     *Operand,
 353     ACPI_OBJECT_TYPE        *ReturnType,
 354     ACPI_OPERAND_OBJECT     **ReturnDesc)
 355 {
 356     ACPI_OPERAND_OBJECT     *ObjDesc = ACPI_CAST_PTR (void, Operand);
 357     ACPI_NAMESPACE_NODE     *Node = ACPI_CAST_PTR (ACPI_NAMESPACE_NODE, Operand);
 358     ACPI_OBJECT_TYPE        Type;
 359     ACPI_STATUS             Status;
 360
 361
 362     ACPI_FUNCTION_TRACE (AcpiExResolveMultiple);
 363
 364
 365     /* Operand can be either a namespace node or an operand descriptor */
 366
 367     switch (ACPI_GET_DESCRIPTOR_TYPE (ObjDesc))
 368     {
 369     case ACPI_DESC_TYPE_OPERAND:
 370
 371         Type = ObjDesc->Common.Type;
 372         break;
 373
 374     case ACPI_DESC_TYPE_NAMED:
 375
 376         Type = ((ACPI_NAMESPACE_NODE *) ObjDesc)->Type;
 377         ObjDesc = AcpiNsGetAttachedObject (Node);
 378
 379         /* If we had an Alias node, use the attached object for type info */
 380
 381         if (Type == ACPI_TYPE_LOCAL_ALIAS)
 382         {
 383             Type = ((ACPI_NAMESPACE_NODE *) ObjDesc)->Type;
 384             ObjDesc = AcpiNsGetAttachedObject (
 385                 (ACPI_NAMESPACE_NODE *) ObjDesc);
 386         }
 387
 388         switch (Type)
 389         {
 390         case ACPI_TYPE_DEVICE:
 391         case ACPI_TYPE_THERMAL:
 392
 393             /* These types have no attached subobject */
 394             break;
 395
 396         default:
 397
 398             /* All other types require a subobject */
 399
 400             if (!ObjDesc)
 401             {
 402                 ACPI_ERROR ((AE_INFO,
 403                     "[%4.4s] Node is unresolved or uninitialized",
 404                     AcpiUtGetNodeName (Node)));
 405                 return_ACPI_STATUS (AE_AML_UNINITIALIZED_NODE);
 406             }
 407             break;
 408         }
 409         break;
 410
 411     default:
 412         return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
 413     }
 414
 415     /* If type is anything other than a reference, we are done */
 416
 417     if (Type != ACPI_TYPE_LOCAL_REFERENCE)
 418     {
 419         goto Exit;
 420     }
 421
 422     /*
 423      * For reference objects created via the RefOf, Index, or Load/LoadTable
 424      * operators, we need to get to the base object (as per the ACPI
 425      * specification of the ObjectType and SizeOf operators). This means
 426      * traversing the list of possibly many nested references.
 427      */
 428     while (ObjDesc->Common.Type == ACPI_TYPE_LOCAL_REFERENCE)
 429     {
 430         switch (ObjDesc->Reference.Class)
 431         {
 432         case ACPI_REFCLASS_REFOF:
 433         case ACPI_REFCLASS_NAME:
 434
 435             /* Dereference the reference pointer */
 436
 437             if (ObjDesc->Reference.Class == ACPI_REFCLASS_REFOF)
 438             {
 439                 Node = ObjDesc->Reference.Object;
 440             }
 441             else /* AML_INT_NAMEPATH_OP */
 442             {
 443                 Node = ObjDesc->Reference.Node;
 444             }
 445
 446             /* All "References" point to a NS node */
 447
 448             if (ACPI_GET_DESCRIPTOR_TYPE (Node) != ACPI_DESC_TYPE_NAMED)
 449             {
 450                 ACPI_ERROR ((AE_INFO,
 451                     "Not a namespace node %p [%s]",
 452                     Node, AcpiUtGetDescriptorName (Node)));
 453                 return_ACPI_STATUS (AE_AML_INTERNAL);
 454             }
 455
 456             /* Get the attached object */
 457
 458             ObjDesc = AcpiNsGetAttachedObject (Node);
 459             if (!ObjDesc)
 460             {
 461                 /* No object, use the NS node type */
 462
 463                 Type = AcpiNsGetType (Node);
 464                 goto Exit;
 465             }
 466
 467             /* Check for circular references */
 468
 469             if (ObjDesc == Operand)
 470             {
 471                 return_ACPI_STATUS (AE_AML_CIRCULAR_REFERENCE);
 472             }
 473             break;
 474
 475         case ACPI_REFCLASS_INDEX:
 476
 477             /* Get the type of this reference (index into another object) */
 478
 479             Type = ObjDesc->Reference.TargetType;
 480             if (Type != ACPI_TYPE_PACKAGE)
 481             {
 482                 goto Exit;
 483             }
 484
 485             /*
 486              * The main object is a package, we want to get the type
 487              * of the individual package element that is referenced by
 488              * the index.
 489              *
 490              * This could of course in turn be another reference object.
 491              */
 492             ObjDesc = *(ObjDesc->Reference.Where);
 493             if (!ObjDesc)
 494             {
 495                 /* NULL package elements are allowed */
 496
 497                 Type = 0; /* Uninitialized */
 498                 goto Exit;
 499             }
 500             break;
 501
 502         case ACPI_REFCLASS_TABLE:
 503
 504             Type = ACPI_TYPE_DDB_HANDLE;
 505             goto Exit;
 506
 507         case ACPI_REFCLASS_LOCAL:
 508         case ACPI_REFCLASS_ARG:
 509
 510             if (ReturnDesc)
 511             {
 512                 Status = AcpiDsMethodDataGetValue (ObjDesc->Reference.Class,
 513                     ObjDesc->Reference.Value, WalkState, &ObjDesc);
 514                 if (ACPI_FAILURE (Status))
 515                 {
 516                     return_ACPI_STATUS (Status);
 517                 }
 518                 AcpiUtRemoveReference (ObjDesc);
 519             }
 520             else
 521             {
 522                 Status = AcpiDsMethodDataGetNode (ObjDesc->Reference.Class,
 523                     ObjDesc->Reference.Value, WalkState, &Node);
 524                 if (ACPI_FAILURE (Status))
 525                 {
 526                     return_ACPI_STATUS (Status);
 527                 }
 528
 529                 ObjDesc = AcpiNsGetAttachedObject (Node);
 530                 if (!ObjDesc)
 531                 {
 532                     Type = ACPI_TYPE_ANY;
 533                     goto Exit;
 534                 }
 535             }
 536             break;
 537
 538         case ACPI_REFCLASS_DEBUG:
 539
 540             /* The Debug Object is of type "DebugObject" */
 541
 542             Type = ACPI_TYPE_DEBUG_OBJECT;
 543             goto Exit;
 544
 545         default:
 546
 547             ACPI_ERROR ((AE_INFO,
 548                 "Unknown Reference Class 0x%2.2X",
 549                 ObjDesc->Reference.Class));
 550             return_ACPI_STATUS (AE_AML_INTERNAL);
 551         }
 552     }
 553
 554     /*
 555      * Now we are guaranteed to have an object that has not been created
 556      * via the RefOf or Index operators.
 557      */
 558     Type = ObjDesc->Common.Type;
 559
 560
 561 Exit:
 562     /* Convert internal types to external types */
 563
 564     switch (Type)
 565     {
 566     case ACPI_TYPE_LOCAL_REGION_FIELD:
 567     case ACPI_TYPE_LOCAL_BANK_FIELD:
 568     case ACPI_TYPE_LOCAL_INDEX_FIELD:
 569
 570         Type = ACPI_TYPE_FIELD_UNIT;
 571         break;
 572
 573     case ACPI_TYPE_LOCAL_SCOPE:
 574
 575         /* Per ACPI Specification, Scope is untyped */
 576
 577         Type = ACPI_TYPE_ANY;
 578         break;
 579
 580     default:
 581
 582         /* No change to Type required */
 583
 584         break;
 585     }
 586
 587     *ReturnType = Type;
 588     if (ReturnDesc)
 589     {
 590         *ReturnDesc = ObjDesc;
 591     }
 592     return_ACPI_STATUS (AE_OK);
 593 }