1 /******************************************************************************
   2  *
   3  * Module Name: exconfig - Namespace reconfiguration (Load/Unload opcodes)
   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 __EXCONFIG_C__
  45 
  46 #include "acpi.h"
  47 #include "accommon.h"
  48 #include "acinterp.h"
  49 #include "acnamesp.h"
  50 #include "actables.h"
  51 #include "acdispat.h"
  52 #include "acevents.h"
  53 #include "amlcode.h"
  54 
  55 
  56 #define _COMPONENT          ACPI_EXECUTER
  57         ACPI_MODULE_NAME    ("exconfig")
  58 
  59 /* Local prototypes */
  60 
  61 static ACPI_STATUS
  62 AcpiExAddTable (
  63     UINT32                  TableIndex,
  64     ACPI_NAMESPACE_NODE     *ParentNode,
  65     ACPI_OPERAND_OBJECT     **DdbHandle);
  66 
  67 static ACPI_STATUS
  68 AcpiExRegionRead (
  69     ACPI_OPERAND_OBJECT     *ObjDesc,
  70     UINT32                  Length,
  71     UINT8                   *Buffer);
  72 
  73 
  74 /*******************************************************************************
  75  *
  76  * FUNCTION:    AcpiExAddTable
  77  *
  78  * PARAMETERS:  Table               - Pointer to raw table
  79  *              ParentNode          - Where to load the table (scope)
  80  *              DdbHandle           - Where to return the table handle.
  81  *
  82  * RETURN:      Status
  83  *
  84  * DESCRIPTION: Common function to Install and Load an ACPI table with a
  85  *              returned table handle.
  86  *
  87  ******************************************************************************/
  88 
  89 static ACPI_STATUS
  90 AcpiExAddTable (
  91     UINT32                  TableIndex,
  92     ACPI_NAMESPACE_NODE     *ParentNode,
  93     ACPI_OPERAND_OBJECT     **DdbHandle)
  94 {
  95     ACPI_OPERAND_OBJECT     *ObjDesc;
  96     ACPI_STATUS             Status;
  97     ACPI_OWNER_ID           OwnerId;
  98 
  99 
 100     ACPI_FUNCTION_TRACE (ExAddTable);
 101 
 102 
 103     /* Create an object to be the table handle */
 104 
 105     ObjDesc = AcpiUtCreateInternalObject (ACPI_TYPE_LOCAL_REFERENCE);
 106     if (!ObjDesc)
 107     {
 108         return_ACPI_STATUS (AE_NO_MEMORY);
 109     }
 110 
 111     /* Init the table handle */
 112 
 113     ObjDesc->Common.Flags |= AOPOBJ_DATA_VALID;
 114     ObjDesc->Reference.Class = ACPI_REFCLASS_TABLE;
 115     *DdbHandle = ObjDesc;
 116 
 117     /* Install the new table into the local data structures */
 118 
 119     ObjDesc->Reference.Value = TableIndex;
 120 
 121     /* Add the table to the namespace */
 122 
 123     Status = AcpiNsLoadTable (TableIndex, ParentNode);
 124     if (ACPI_FAILURE (Status))
 125     {
 126         AcpiUtRemoveReference (ObjDesc);
 127         *DdbHandle = NULL;
 128         return_ACPI_STATUS (Status);
 129     }
 130 
 131     /* Execute any module-level code that was found in the table */
 132 
 133     AcpiExExitInterpreter ();
 134     AcpiNsExecModuleCodeList ();
 135     AcpiExEnterInterpreter ();
 136 
 137     /*
 138      * Update GPEs for any new _Lxx/_Exx methods. Ignore errors. The host is
 139      * responsible for discovering any new wake GPEs by running _PRW methods
 140      * that may have been loaded by this table.
 141      */
 142     Status = AcpiTbGetOwnerId (TableIndex, &OwnerId);
 143     if (ACPI_SUCCESS (Status))
 144     {
 145         AcpiEvUpdateGpes (OwnerId);
 146     }
 147 
 148     return_ACPI_STATUS (AE_OK);
 149 }
 150 
 151 
 152 /*******************************************************************************
 153  *
 154  * FUNCTION:    AcpiExLoadTableOp
 155  *
 156  * PARAMETERS:  WalkState           - Current state with operands
 157  *              ReturnDesc          - Where to store the return object
 158  *
 159  * RETURN:      Status
 160  *
 161  * DESCRIPTION: Load an ACPI table from the RSDT/XSDT
 162  *
 163  ******************************************************************************/
 164 
 165 ACPI_STATUS
 166 AcpiExLoadTableOp (
 167     ACPI_WALK_STATE         *WalkState,
 168     ACPI_OPERAND_OBJECT     **ReturnDesc)
 169 {
 170     ACPI_STATUS             Status;
 171     ACPI_OPERAND_OBJECT     **Operand = &WalkState->Operands[0];
 172     ACPI_NAMESPACE_NODE     *ParentNode;
 173     ACPI_NAMESPACE_NODE     *StartNode;
 174     ACPI_NAMESPACE_NODE     *ParameterNode = NULL;
 175     ACPI_OPERAND_OBJECT     *DdbHandle;
 176     ACPI_TABLE_HEADER       *Table;
 177     UINT32                  TableIndex;
 178 
 179 
 180     ACPI_FUNCTION_TRACE (ExLoadTableOp);
 181 
 182 
 183     /* Validate lengths for the Signature, OemId, and OemTableId strings */
 184 
 185     if ((Operand[0]->String.Length > ACPI_NAME_SIZE) ||
 186         (Operand[1]->String.Length > ACPI_OEM_ID_SIZE) ||
 187         (Operand[2]->String.Length > ACPI_OEM_TABLE_ID_SIZE))
 188     {
 189         return_ACPI_STATUS (AE_AML_STRING_LIMIT);
 190     }
 191 
 192     /* Find the ACPI table in the RSDT/XSDT */
 193 
 194     Status = AcpiTbFindTable (
 195                 Operand[0]->String.Pointer,
 196                 Operand[1]->String.Pointer,
 197                 Operand[2]->String.Pointer, &TableIndex);
 198     if (ACPI_FAILURE (Status))
 199     {
 200         if (Status != AE_NOT_FOUND)
 201         {
 202             return_ACPI_STATUS (Status);
 203         }
 204 
 205         /* Table not found, return an Integer=0 and AE_OK */
 206 
 207         DdbHandle = AcpiUtCreateIntegerObject ((UINT64) 0);
 208         if (!DdbHandle)
 209         {
 210             return_ACPI_STATUS (AE_NO_MEMORY);
 211         }
 212 
 213         *ReturnDesc = DdbHandle;
 214         return_ACPI_STATUS (AE_OK);
 215     }
 216 
 217     /* Default nodes */
 218 
 219     StartNode = WalkState->ScopeInfo->Scope.Node;
 220     ParentNode = AcpiGbl_RootNode;
 221 
 222     /* RootPath (optional parameter) */
 223 
 224     if (Operand[3]->String.Length > 0)
 225     {
 226         /*
 227          * Find the node referenced by the RootPathString. This is the
 228          * location within the namespace where the table will be loaded.
 229          */
 230         Status = AcpiNsGetNode (StartNode, Operand[3]->String.Pointer,
 231                     ACPI_NS_SEARCH_PARENT, &ParentNode);
 232         if (ACPI_FAILURE (Status))
 233         {
 234             return_ACPI_STATUS (Status);
 235         }
 236     }
 237 
 238     /* ParameterPath (optional parameter) */
 239 
 240     if (Operand[4]->String.Length > 0)
 241     {
 242         if ((Operand[4]->String.Pointer[0] != AML_ROOT_PREFIX) &&
 243             (Operand[4]->String.Pointer[0] != AML_PARENT_PREFIX))
 244         {
 245             /*
 246              * Path is not absolute, so it will be relative to the node
 247              * referenced by the RootPathString (or the NS root if omitted)
 248              */
 249             StartNode = ParentNode;
 250         }
 251 
 252         /* Find the node referenced by the ParameterPathString */
 253 
 254         Status = AcpiNsGetNode (StartNode, Operand[4]->String.Pointer,
 255                     ACPI_NS_SEARCH_PARENT, &ParameterNode);
 256         if (ACPI_FAILURE (Status))
 257         {
 258             return_ACPI_STATUS (Status);
 259         }
 260     }
 261 
 262     /* Load the table into the namespace */
 263 
 264     Status = AcpiExAddTable (TableIndex, ParentNode, &DdbHandle);
 265     if (ACPI_FAILURE (Status))
 266     {
 267         return_ACPI_STATUS (Status);
 268     }
 269 
 270     /* Parameter Data (optional) */
 271 
 272     if (ParameterNode)
 273     {
 274         /* Store the parameter data into the optional parameter object */
 275 
 276         Status = AcpiExStore (Operand[5],
 277                     ACPI_CAST_PTR (ACPI_OPERAND_OBJECT, ParameterNode),
 278                     WalkState);
 279         if (ACPI_FAILURE (Status))
 280         {
 281             (void) AcpiExUnloadTable (DdbHandle);
 282 
 283             AcpiUtRemoveReference (DdbHandle);
 284             return_ACPI_STATUS (Status);
 285         }
 286     }
 287 
 288     Status = AcpiGetTableByIndex (TableIndex, &Table);
 289     if (ACPI_SUCCESS (Status))
 290     {
 291         ACPI_INFO ((AE_INFO, "Dynamic OEM Table Load:"));
 292         AcpiTbPrintTableHeader (0, Table);
 293     }
 294 
 295     /* Invoke table handler if present */
 296 
 297     if (AcpiGbl_TableHandler)
 298     {
 299         (void) AcpiGbl_TableHandler (ACPI_TABLE_EVENT_LOAD, Table,
 300                     AcpiGbl_TableHandlerContext);
 301     }
 302 
 303     *ReturnDesc = DdbHandle;
 304     return_ACPI_STATUS (Status);
 305 }
 306 
 307 
 308 /*******************************************************************************
 309  *
 310  * FUNCTION:    AcpiExRegionRead
 311  *
 312  * PARAMETERS:  ObjDesc         - Region descriptor
 313  *              Length          - Number of bytes to read
 314  *              Buffer          - Pointer to where to put the data
 315  *
 316  * RETURN:      Status
 317  *
 318  * DESCRIPTION: Read data from an operation region. The read starts from the
 319  *              beginning of the region.
 320  *
 321  ******************************************************************************/
 322 
 323 static ACPI_STATUS
 324 AcpiExRegionRead (
 325     ACPI_OPERAND_OBJECT     *ObjDesc,
 326     UINT32                  Length,
 327     UINT8                   *Buffer)
 328 {
 329     ACPI_STATUS             Status;
 330     UINT64                  Value;
 331     UINT32                  RegionOffset = 0;
 332     UINT32                  i;
 333 
 334 
 335     /* Bytewise reads */
 336 
 337     for (i = 0; i < Length; i++)
 338     {
 339         Status = AcpiEvAddressSpaceDispatch (ObjDesc, NULL, ACPI_READ,
 340                     RegionOffset, 8, &Value);
 341         if (ACPI_FAILURE (Status))
 342         {
 343             return (Status);
 344         }
 345 
 346         *Buffer = (UINT8) Value;
 347         Buffer++;
 348         RegionOffset++;
 349     }
 350 
 351     return (AE_OK);
 352 }
 353 
 354 
 355 /*******************************************************************************
 356  *
 357  * FUNCTION:    AcpiExLoadOp
 358  *
 359  * PARAMETERS:  ObjDesc         - Region or Buffer/Field where the table will be
 360  *                                obtained
 361  *              Target          - Where a handle to the table will be stored
 362  *              WalkState       - Current state
 363  *
 364  * RETURN:      Status
 365  *
 366  * DESCRIPTION: Load an ACPI table from a field or operation region
 367  *
 368  * NOTE: Region Fields (Field, BankField, IndexFields) are resolved to buffer
 369  *       objects before this code is reached.
 370  *
 371  *       If source is an operation region, it must refer to SystemMemory, as
 372  *       per the ACPI specification.
 373  *
 374  ******************************************************************************/
 375 
 376 ACPI_STATUS
 377 AcpiExLoadOp (
 378     ACPI_OPERAND_OBJECT     *ObjDesc,
 379     ACPI_OPERAND_OBJECT     *Target,
 380     ACPI_WALK_STATE         *WalkState)
 381 {
 382     ACPI_OPERAND_OBJECT     *DdbHandle;
 383     ACPI_TABLE_HEADER       *Table;
 384     ACPI_TABLE_DESC         TableDesc;
 385     UINT32                  TableIndex;
 386     ACPI_STATUS             Status;
 387     UINT32                  Length;
 388 
 389 
 390     ACPI_FUNCTION_TRACE (ExLoadOp);
 391 
 392 
 393     ACPI_MEMSET (&TableDesc, 0, sizeof (ACPI_TABLE_DESC));
 394 
 395     /* Source Object can be either an OpRegion or a Buffer/Field */
 396 
 397     switch (ObjDesc->Common.Type)
 398     {
 399     case ACPI_TYPE_REGION:
 400 
 401         ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
 402             "Load table from Region %p\n", ObjDesc));
 403 
 404         /* Region must be SystemMemory (from ACPI spec) */
 405 
 406         if (ObjDesc->Region.SpaceId != ACPI_ADR_SPACE_SYSTEM_MEMORY)
 407         {
 408             return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
 409         }
 410 
 411         /*
 412          * If the Region Address and Length have not been previously evaluated,
 413          * evaluate them now and save the results.
 414          */
 415         if (!(ObjDesc->Common.Flags & AOPOBJ_DATA_VALID))
 416         {
 417             Status = AcpiDsGetRegionArguments (ObjDesc);
 418             if (ACPI_FAILURE (Status))
 419             {
 420                 return_ACPI_STATUS (Status);
 421             }
 422         }
 423 
 424         /* Get the table header first so we can get the table length */
 425 
 426         Table = ACPI_ALLOCATE (sizeof (ACPI_TABLE_HEADER));
 427         if (!Table)
 428         {
 429             return_ACPI_STATUS (AE_NO_MEMORY);
 430         }
 431 
 432         Status = AcpiExRegionRead (ObjDesc, sizeof (ACPI_TABLE_HEADER),
 433                     ACPI_CAST_PTR (UINT8, Table));
 434         Length = Table->Length;
 435         ACPI_FREE (Table);
 436 
 437         if (ACPI_FAILURE (Status))
 438         {
 439             return_ACPI_STATUS (Status);
 440         }
 441 
 442         /* Must have at least an ACPI table header */
 443 
 444         if (Length < sizeof (ACPI_TABLE_HEADER))
 445         {
 446             return_ACPI_STATUS (AE_INVALID_TABLE_LENGTH);
 447         }
 448 
 449         /*
 450          * The original implementation simply mapped the table, with no copy.
 451          * However, the memory region is not guaranteed to remain stable and
 452          * we must copy the table to a local buffer. For example, the memory
 453          * region is corrupted after suspend on some machines. Dynamically
 454          * loaded tables are usually small, so this overhead is minimal.
 455          *
 456          * The latest implementation (5/2009) does not use a mapping at all.
 457          * We use the low-level operation region interface to read the table
 458          * instead of the obvious optimization of using a direct mapping.
 459          * This maintains a consistent use of operation regions across the
 460          * entire subsystem. This is important if additional processing must
 461          * be performed in the (possibly user-installed) operation region
 462          * handler. For example, AcpiExec and ASLTS depend on this.
 463          */
 464 
 465         /* Allocate a buffer for the table */
 466 
 467         TableDesc.Pointer = ACPI_ALLOCATE (Length);
 468         if (!TableDesc.Pointer)
 469         {
 470             return_ACPI_STATUS (AE_NO_MEMORY);
 471         }
 472 
 473         /* Read the entire table */
 474 
 475         Status = AcpiExRegionRead (ObjDesc, Length,
 476                     ACPI_CAST_PTR (UINT8, TableDesc.Pointer));
 477         if (ACPI_FAILURE (Status))
 478         {
 479             ACPI_FREE (TableDesc.Pointer);
 480             return_ACPI_STATUS (Status);
 481         }
 482 
 483         TableDesc.Address = ObjDesc->Region.Address;
 484         break;
 485 
 486     case ACPI_TYPE_BUFFER: /* Buffer or resolved RegionField */
 487 
 488         ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
 489             "Load table from Buffer or Field %p\n", ObjDesc));
 490 
 491         /* Must have at least an ACPI table header */
 492 
 493         if (ObjDesc->Buffer.Length < sizeof (ACPI_TABLE_HEADER))
 494         {
 495             return_ACPI_STATUS (AE_INVALID_TABLE_LENGTH);
 496         }
 497 
 498         /* Get the actual table length from the table header */
 499 
 500         Table = ACPI_CAST_PTR (ACPI_TABLE_HEADER, ObjDesc->Buffer.Pointer);
 501         Length = Table->Length;
 502 
 503         /* Table cannot extend beyond the buffer */
 504 
 505         if (Length > ObjDesc->Buffer.Length)
 506         {
 507             return_ACPI_STATUS (AE_AML_BUFFER_LIMIT);
 508         }
 509         if (Length < sizeof (ACPI_TABLE_HEADER))
 510         {
 511             return_ACPI_STATUS (AE_INVALID_TABLE_LENGTH);
 512         }
 513 
 514         /*
 515          * Copy the table from the buffer because the buffer could be modified
 516          * or even deleted in the future
 517          */
 518         TableDesc.Pointer = ACPI_ALLOCATE (Length);
 519         if (!TableDesc.Pointer)
 520         {
 521             return_ACPI_STATUS (AE_NO_MEMORY);
 522         }
 523 
 524         ACPI_MEMCPY (TableDesc.Pointer, Table, Length);
 525         TableDesc.Address = ACPI_TO_INTEGER (TableDesc.Pointer);
 526         break;
 527 
 528     default:
 529 
 530         return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
 531     }
 532 
 533     /* Validate table checksum (will not get validated in TbAddTable) */
 534 
 535     Status = AcpiTbVerifyChecksum (TableDesc.Pointer, Length);
 536     if (ACPI_FAILURE (Status))
 537     {
 538         ACPI_FREE (TableDesc.Pointer);
 539         return_ACPI_STATUS (Status);
 540     }
 541 
 542     /* Complete the table descriptor */
 543 
 544     TableDesc.Length = Length;
 545     TableDesc.Flags = ACPI_TABLE_ORIGIN_ALLOCATED;
 546 
 547     /* Install the new table into the local data structures */
 548 
 549     Status = AcpiTbAddTable (&TableDesc, &TableIndex);
 550     if (ACPI_FAILURE (Status))
 551     {
 552         /* Delete allocated table buffer */
 553 
 554         AcpiTbDeleteTable (&TableDesc);
 555         return_ACPI_STATUS (Status);
 556     }
 557 
 558     /*
 559      * Add the table to the namespace.
 560      *
 561      * Note: Load the table objects relative to the root of the namespace.
 562      * This appears to go against the ACPI specification, but we do it for
 563      * compatibility with other ACPI implementations.
 564      */
 565     Status = AcpiExAddTable (TableIndex, AcpiGbl_RootNode, &DdbHandle);
 566     if (ACPI_FAILURE (Status))
 567     {
 568         /* On error, TablePtr was deallocated above */
 569 
 570         return_ACPI_STATUS (Status);
 571     }
 572 
 573     /* Store the DdbHandle into the Target operand */
 574 
 575     Status = AcpiExStore (DdbHandle, Target, WalkState);
 576     if (ACPI_FAILURE (Status))
 577     {
 578         (void) AcpiExUnloadTable (DdbHandle);
 579 
 580         /* TablePtr was deallocated above */
 581 
 582         AcpiUtRemoveReference (DdbHandle);
 583         return_ACPI_STATUS (Status);
 584     }
 585 
 586     ACPI_INFO ((AE_INFO, "Dynamic OEM Table Load:"));
 587     AcpiTbPrintTableHeader (0, TableDesc.Pointer);
 588 
 589     /* Remove the reference by added by AcpiExStore above */
 590 
 591     AcpiUtRemoveReference (DdbHandle);
 592 
 593     /* Invoke table handler if present */
 594 
 595     if (AcpiGbl_TableHandler)
 596     {
 597         (void) AcpiGbl_TableHandler (ACPI_TABLE_EVENT_LOAD, TableDesc.Pointer,
 598                     AcpiGbl_TableHandlerContext);
 599     }
 600 
 601     return_ACPI_STATUS (Status);
 602 }
 603 
 604 
 605 /*******************************************************************************
 606  *
 607  * FUNCTION:    AcpiExUnloadTable
 608  *
 609  * PARAMETERS:  DdbHandle           - Handle to a previously loaded table
 610  *
 611  * RETURN:      Status
 612  *
 613  * DESCRIPTION: Unload an ACPI table
 614  *
 615  ******************************************************************************/
 616 
 617 ACPI_STATUS
 618 AcpiExUnloadTable (
 619     ACPI_OPERAND_OBJECT     *DdbHandle)
 620 {
 621     ACPI_STATUS             Status = AE_OK;
 622     ACPI_OPERAND_OBJECT     *TableDesc = DdbHandle;
 623     UINT32                  TableIndex;
 624     ACPI_TABLE_HEADER       *Table;
 625 
 626 
 627     ACPI_FUNCTION_TRACE (ExUnloadTable);
 628 
 629 
 630     /*
 631      * Validate the handle
 632      * Although the handle is partially validated in AcpiExReconfiguration()
 633      * when it calls AcpiExResolveOperands(), the handle is more completely
 634      * validated here.
 635      *
 636      * Handle must be a valid operand object of type reference. Also, the
 637      * DdbHandle must still be marked valid (table has not been previously
 638      * unloaded)
 639      */
 640     if ((!DdbHandle) ||
 641         (ACPI_GET_DESCRIPTOR_TYPE (DdbHandle) != ACPI_DESC_TYPE_OPERAND) ||
 642         (DdbHandle->Common.Type != ACPI_TYPE_LOCAL_REFERENCE) ||
 643         (!(DdbHandle->Common.Flags & AOPOBJ_DATA_VALID)))
 644     {
 645         return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
 646     }
 647 
 648     /* Get the table index from the DdbHandle */
 649 
 650     TableIndex = TableDesc->Reference.Value;
 651 
 652     /* Ensure the table is still loaded */
 653 
 654     if (!AcpiTbIsTableLoaded (TableIndex))
 655     {
 656         return_ACPI_STATUS (AE_NOT_EXIST);
 657     }
 658 
 659     /* Invoke table handler if present */
 660 
 661     if (AcpiGbl_TableHandler)
 662     {
 663         Status = AcpiGetTableByIndex (TableIndex, &Table);
 664         if (ACPI_SUCCESS (Status))
 665         {
 666             (void) AcpiGbl_TableHandler (ACPI_TABLE_EVENT_UNLOAD, Table,
 667                         AcpiGbl_TableHandlerContext);
 668         }
 669     }
 670 
 671     /* Delete the portion of the namespace owned by this table */
 672 
 673     Status = AcpiTbDeleteNamespaceByOwner (TableIndex);
 674     if (ACPI_FAILURE (Status))
 675     {
 676         return_ACPI_STATUS (Status);
 677     }
 678 
 679     (void) AcpiTbReleaseOwnerId (TableIndex);
 680     AcpiTbSetTableLoadedFlag (TableIndex, FALSE);
 681 
 682     /*
 683      * Invalidate the handle. We do this because the handle may be stored
 684      * in a named object and may not be actually deleted until much later.
 685      */
 686     DdbHandle->Common.Flags &= ~AOPOBJ_DATA_VALID;
 687     return_ACPI_STATUS (AE_OK);
 688 }