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

   1 /******************************************************************************
   2  *
   3  * Module Name: nsload - namespace loading/expanding/contracting procedures
   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 "acnamesp.h"
  47 #include "acdispat.h"
  48 #include "actables.h"
  49
  50
  51 #define _COMPONENT          ACPI_NAMESPACE
  52         ACPI_MODULE_NAME    ("nsload")
  53
  54 /* Local prototypes */
  55
  56 #ifdef ACPI_FUTURE_IMPLEMENTATION
  57 ACPI_STATUS
  58 AcpiNsUnloadNamespace (
  59     ACPI_HANDLE             Handle);
  60
  61 static ACPI_STATUS
  62 AcpiNsDeleteSubtree (
  63     ACPI_HANDLE             StartHandle);
  64 #endif
  65
  66
  67 #ifndef ACPI_NO_METHOD_EXECUTION
  68 /*******************************************************************************
  69  *
  70  * FUNCTION:    AcpiNsLoadTable
  71  *
  72  * PARAMETERS:  TableIndex      - Index for table to be loaded
  73  *              Node            - Owning NS node
  74  *
  75  * RETURN:      Status
  76  *
  77  * DESCRIPTION: Load one ACPI table into the namespace
  78  *
  79  ******************************************************************************/
  80
  81 ACPI_STATUS
  82 AcpiNsLoadTable (
  83     UINT32                  TableIndex,
  84     ACPI_NAMESPACE_NODE     *Node)
  85 {
  86     ACPI_STATUS             Status;
  87
  88
  89     ACPI_FUNCTION_TRACE (NsLoadTable);
  90
  91
  92     /*
  93      * Parse the table and load the namespace with all named
  94      * objects found within. Control methods are NOT parsed
  95      * at this time. In fact, the control methods cannot be
  96      * parsed until the entire namespace is loaded, because
  97      * if a control method makes a forward reference (call)
  98      * to another control method, we can't continue parsing
  99      * because we don't know how many arguments to parse next!
 100      */
 101     Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE);
 102     if (ACPI_FAILURE (Status))
 103     {
 104         return_ACPI_STATUS (Status);
 105     }
 106
 107     /* If table already loaded into namespace, just return */
 108
 109     if (AcpiTbIsTableLoaded (TableIndex))
 110     {
 111         Status = AE_ALREADY_EXISTS;
 112         goto Unlock;
 113     }
 114
 115     ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
 116         "**** Loading table into namespace ****\n"));
 117
 118     Status = AcpiTbAllocateOwnerId (TableIndex);
 119     if (ACPI_FAILURE (Status))
 120     {
 121         goto Unlock;
 122     }
 123
 124     Status = AcpiNsParseTable (TableIndex, Node);
 125     if (ACPI_SUCCESS (Status))
 126     {
 127         AcpiTbSetTableLoadedFlag (TableIndex, TRUE);
 128     }
 129     else
 130     {
 131         /*
 132          * On error, delete any namespace objects created by this table.
 133          * We cannot initialize these objects, so delete them. There are
 134          * a couple of expecially bad cases:
 135          * AE_ALREADY_EXISTS - namespace collision.
 136          * AE_NOT_FOUND - the target of a Scope operator does not
 137          * exist. This target of Scope must already exist in the
 138          * namespace, as per the ACPI specification.
 139          */
 140         (void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE);
 141         AcpiNsDeleteNamespaceByOwner (
 142             AcpiGbl_RootTableList.Tables[TableIndex].OwnerId);
 143             AcpiTbReleaseOwnerId (TableIndex);
 144
 145         return_ACPI_STATUS (Status);
 146     }
 147
 148 Unlock:
 149     (void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE);
 150
 151     if (ACPI_FAILURE (Status))
 152     {
 153         return_ACPI_STATUS (Status);
 154     }
 155
 156     /*
 157      * Now we can parse the control methods. We always parse
 158      * them here for a sanity check, and if configured for
 159      * just-in-time parsing, we delete the control method
 160      * parse trees.
 161      */
 162     ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
 163         "**** Begin Table Object Initialization\n"));
 164
 165     Status = AcpiDsInitializeObjects (TableIndex, Node);
 166
 167     ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
 168         "**** Completed Table Object Initialization\n"));
 169
 170     /*
 171      * Execute any module-level code that was detected during the table load
 172      * phase. Although illegal since ACPI 2.0, there are many machines that
 173      * contain this type of code. Each block of detected executable AML code
 174      * outside of any control method is wrapped with a temporary control
 175      * method object and placed on a global list. The methods on this list
 176      * are executed below.
 177      *
 178      * This case executes the module-level code for each table immediately
 179      * after the table has been loaded. This provides compatibility with
 180      * other ACPI implementations. Optionally, the execution can be deferred
 181      * until later, see AcpiInitializeObjects.
 182      */
 183     if (!AcpiGbl_GroupModuleLevelCode)
 184     {
 185         AcpiNsExecModuleCodeList ();
 186     }
 187
 188     return_ACPI_STATUS (Status);
 189 }
 190
 191
 192 #ifdef ACPI_OBSOLETE_FUNCTIONS
 193 /*******************************************************************************
 194  *
 195  * FUNCTION:    AcpiLoadNamespace
 196  *
 197  * PARAMETERS:  None
 198  *
 199  * RETURN:      Status
 200  *
 201  * DESCRIPTION: Load the name space from what ever is pointed to by DSDT.
 202  *              (DSDT points to either the BIOS or a buffer.)
 203  *
 204  ******************************************************************************/
 205
 206 ACPI_STATUS
 207 AcpiNsLoadNamespace (
 208     void)
 209 {
 210     ACPI_STATUS             Status;
 211
 212
 213     ACPI_FUNCTION_TRACE (AcpiLoadNameSpace);
 214
 215
 216     /* There must be at least a DSDT installed */
 217
 218     if (AcpiGbl_DSDT == NULL)
 219     {
 220         ACPI_ERROR ((AE_INFO, "DSDT is not in memory"));
 221         return_ACPI_STATUS (AE_NO_ACPI_TABLES);
 222     }
 223
 224     /*
 225      * Load the namespace. The DSDT is required,
 226      * but the SSDT and PSDT tables are optional.
 227      */
 228     Status = AcpiNsLoadTableByType (ACPI_TABLE_ID_DSDT);
 229     if (ACPI_FAILURE (Status))
 230     {
 231         return_ACPI_STATUS (Status);
 232     }
 233
 234     /* Ignore exceptions from these */
 235
 236     (void) AcpiNsLoadTableByType (ACPI_TABLE_ID_SSDT);
 237     (void) AcpiNsLoadTableByType (ACPI_TABLE_ID_PSDT);
 238
 239     ACPI_DEBUG_PRINT_RAW ((ACPI_DB_INIT,
 240         "ACPI Namespace successfully loaded at root %p\n",
 241         AcpiGbl_RootNode));
 242
 243     return_ACPI_STATUS (Status);
 244 }
 245 #endif
 246
 247 #ifdef ACPI_FUTURE_IMPLEMENTATION
 248 /*******************************************************************************
 249  *
 250  * FUNCTION:    AcpiNsDeleteSubtree
 251  *
 252  * PARAMETERS:  StartHandle         - Handle in namespace where search begins
 253  *
 254  * RETURNS      Status
 255  *
 256  * DESCRIPTION: Walks the namespace starting at the given handle and deletes
 257  *              all objects, entries, and scopes in the entire subtree.
 258  *
 259  *              Namespace/Interpreter should be locked or the subsystem should
 260  *              be in shutdown before this routine is called.
 261  *
 262  ******************************************************************************/
 263
 264 static ACPI_STATUS
 265 AcpiNsDeleteSubtree (
 266     ACPI_HANDLE             StartHandle)
 267 {
 268     ACPI_STATUS             Status;
 269     ACPI_HANDLE             ChildHandle;
 270     ACPI_HANDLE             ParentHandle;
 271     ACPI_HANDLE             NextChildHandle;
 272     ACPI_HANDLE             Dummy;
 273     UINT32                  Level;
 274
 275
 276     ACPI_FUNCTION_TRACE (NsDeleteSubtree);
 277
 278
 279     ParentHandle = StartHandle;
 280     ChildHandle = NULL;
 281     Level = 1;
 282
 283     /*
 284      * Traverse the tree of objects until we bubble back up
 285      * to where we started.
 286      */
 287     while (Level > 0)
 288     {
 289         /* Attempt to get the next object in this scope */
 290
 291         Status = AcpiGetNextObject (ACPI_TYPE_ANY, ParentHandle,
 292             ChildHandle, &NextChildHandle);
 293
 294         ChildHandle = NextChildHandle;
 295
 296         /* Did we get a new object? */
 297
 298         if (ACPI_SUCCESS (Status))
 299         {
 300             /* Check if this object has any children */
 301
 302             if (ACPI_SUCCESS (AcpiGetNextObject (ACPI_TYPE_ANY, ChildHandle,
 303                 NULL, &Dummy)))
 304             {
 305                 /*
 306                  * There is at least one child of this object,
 307                  * visit the object
 308                  */
 309                 Level++;
 310                 ParentHandle = ChildHandle;
 311                 ChildHandle  = NULL;
 312             }
 313         }
 314         else
 315         {
 316             /*
 317              * No more children in this object, go back up to
 318              * the object's parent
 319              */
 320             Level--;
 321
 322             /* Delete all children now */
 323
 324             AcpiNsDeleteChildren (ChildHandle);
 325
 326             ChildHandle = ParentHandle;
 327             Status = AcpiGetParent (ParentHandle, &ParentHandle);
 328             if (ACPI_FAILURE (Status))
 329             {
 330                 return_ACPI_STATUS (Status);
 331             }
 332         }
 333     }
 334
 335     /* Now delete the starting object, and we are done */
 336
 337     AcpiNsRemoveNode (ChildHandle);
 338     return_ACPI_STATUS (AE_OK);
 339 }
 340
 341
 342 /*******************************************************************************
 343  *
 344  *  FUNCTION:       AcpiNsUnloadNameSpace
 345  *
 346  *  PARAMETERS:     Handle          - Root of namespace subtree to be deleted
 347  *
 348  *  RETURN:         Status
 349  *
 350  *  DESCRIPTION:    Shrinks the namespace, typically in response to an undocking
 351  *                  event. Deletes an entire subtree starting from (and
 352  *                  including) the given handle.
 353  *
 354  ******************************************************************************/
 355
 356 ACPI_STATUS
 357 AcpiNsUnloadNamespace (
 358     ACPI_HANDLE             Handle)
 359 {
 360     ACPI_STATUS             Status;
 361
 362
 363     ACPI_FUNCTION_TRACE (NsUnloadNameSpace);
 364
 365
 366     /* Parameter validation */
 367
 368     if (!AcpiGbl_RootNode)
 369     {
 370         return_ACPI_STATUS (AE_NO_NAMESPACE);
 371     }
 372
 373     if (!Handle)
 374     {
 375         return_ACPI_STATUS (AE_BAD_PARAMETER);
 376     }
 377
 378     /* This function does the real work */
 379
 380     Status = AcpiNsDeleteSubtree (Handle);
 381     return_ACPI_STATUS (Status);
 382 }
 383 #endif
 384 #endif