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