sys/contrib/dev/acpica/source/components/namespace/nsparse.c

   1 /******************************************************************************
   2  *
   3  * Module Name: nsparse - namespace interface to AML parser
   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 "acparser.h"
  48 #include "acdispat.h"
  49 #include "actables.h"
  50 #include "acinterp.h"
  51
  52
  53 #define _COMPONENT          ACPI_NAMESPACE
  54         ACPI_MODULE_NAME    ("nsparse")
  55
  56
  57 /*******************************************************************************
  58  *
  59  * FUNCTION:    NsExecuteTable
  60  *
  61  * PARAMETERS:  TableDesc       - An ACPI table descriptor for table to parse
  62  *              StartNode       - Where to enter the table into the namespace
  63  *
  64  * RETURN:      Status
  65  *
  66  * DESCRIPTION: Load ACPI/AML table by executing the entire table as a
  67  *              TermList.
  68  *
  69  ******************************************************************************/
  70
  71 ACPI_STATUS
  72 AcpiNsExecuteTable (
  73     UINT32                  TableIndex,
  74     ACPI_NAMESPACE_NODE     *StartNode)
  75 {
  76     ACPI_STATUS             Status;
  77     ACPI_TABLE_HEADER       *Table;
  78     ACPI_OWNER_ID           OwnerId;
  79     ACPI_EVALUATE_INFO      *Info = NULL;
  80     UINT32                  AmlLength;
  81     UINT8                   *AmlStart;
  82     ACPI_OPERAND_OBJECT     *MethodObj = NULL;
  83
  84
  85     ACPI_FUNCTION_TRACE (NsExecuteTable);
  86
  87
  88     Status = AcpiGetTableByIndex (TableIndex, &Table);
  89     if (ACPI_FAILURE (Status))
  90     {
  91         return_ACPI_STATUS (Status);
  92     }
  93
  94     /* Table must consist of at least a complete header */
  95
  96     if (Table->Length < sizeof (ACPI_TABLE_HEADER))
  97     {
  98         return_ACPI_STATUS (AE_BAD_HEADER);
  99     }
 100
 101     AmlStart = (UINT8 *) Table + sizeof (ACPI_TABLE_HEADER);
 102     AmlLength = Table->Length - sizeof (ACPI_TABLE_HEADER);
 103
 104     Status = AcpiTbGetOwnerId (TableIndex, &OwnerId);
 105     if (ACPI_FAILURE (Status))
 106     {
 107         return_ACPI_STATUS (Status);
 108     }
 109
 110     /* Create, initialize, and link a new temporary method object */
 111
 112     MethodObj = AcpiUtCreateInternalObject (ACPI_TYPE_METHOD);
 113     if (!MethodObj)
 114     {
 115         return_ACPI_STATUS (AE_NO_MEMORY);
 116     }
 117
 118     /* Allocate the evaluation information block */
 119
 120     Info = ACPI_ALLOCATE_ZEROED (sizeof (ACPI_EVALUATE_INFO));
 121     if (!Info)
 122     {
 123         Status = AE_NO_MEMORY;
 124         goto Cleanup;
 125     }
 126
 127     ACPI_DEBUG_PRINT ((ACPI_DB_PARSE,
 128         "Create table code block: %p\n", MethodObj));
 129
 130     MethodObj->Method.AmlStart = AmlStart;
 131     MethodObj->Method.AmlLength = AmlLength;
 132     MethodObj->Method.OwnerId = OwnerId;
 133     MethodObj->Method.InfoFlags |= ACPI_METHOD_MODULE_LEVEL;
 134
 135     Info->PassNumber = ACPI_IMODE_EXECUTE;
 136     Info->Node = StartNode;
 137     Info->ObjDesc = MethodObj;
 138     Info->NodeFlags = Info->Node->Flags;
 139     Info->FullPathname = AcpiNsGetNormalizedPathname (Info->Node, TRUE);
 140     if (!Info->FullPathname)
 141     {
 142         Status = AE_NO_MEMORY;
 143         goto Cleanup;
 144     }
 145
 146     Status = AcpiPsExecuteTable (Info);
 147
 148 Cleanup:
 149     if (Info)
 150     {
 151         ACPI_FREE (Info->FullPathname);
 152         Info->FullPathname = NULL;
 153     }
 154     ACPI_FREE (Info);
 155     AcpiUtRemoveReference (MethodObj);
 156     return_ACPI_STATUS (Status);
 157 }
 158
 159
 160 /*******************************************************************************
 161  *
 162  * FUNCTION:    NsOneCompleteParse
 163  *
 164  * PARAMETERS:  PassNumber              - 1 or 2
 165  *              TableDesc               - The table to be parsed.
 166  *
 167  * RETURN:      Status
 168  *
 169  * DESCRIPTION: Perform one complete parse of an ACPI/AML table.
 170  *
 171  ******************************************************************************/
 172
 173 ACPI_STATUS
 174 AcpiNsOneCompleteParse (
 175     UINT32                  PassNumber,
 176     UINT32                  TableIndex,
 177     ACPI_NAMESPACE_NODE     *StartNode)
 178 {
 179     ACPI_PARSE_OBJECT       *ParseRoot;
 180     ACPI_STATUS             Status;
 181     UINT32                  AmlLength;
 182     UINT8                   *AmlStart;
 183     ACPI_WALK_STATE         *WalkState;
 184     ACPI_TABLE_HEADER       *Table;
 185     ACPI_OWNER_ID           OwnerId;
 186
 187
 188     ACPI_FUNCTION_TRACE (NsOneCompleteParse);
 189
 190
 191     Status = AcpiGetTableByIndex (TableIndex, &Table);
 192     if (ACPI_FAILURE (Status))
 193     {
 194         return_ACPI_STATUS (Status);
 195     }
 196
 197     /* Table must consist of at least a complete header */
 198
 199     if (Table->Length < sizeof (ACPI_TABLE_HEADER))
 200     {
 201         return_ACPI_STATUS (AE_BAD_HEADER);
 202     }
 203
 204     AmlStart = (UINT8 *) Table + sizeof (ACPI_TABLE_HEADER);
 205     AmlLength = Table->Length - sizeof (ACPI_TABLE_HEADER);
 206
 207     Status = AcpiTbGetOwnerId (TableIndex, &OwnerId);
 208     if (ACPI_FAILURE (Status))
 209     {
 210         return_ACPI_STATUS (Status);
 211     }
 212
 213     /* Create and init a Root Node */
 214
 215     ParseRoot = AcpiPsCreateScopeOp (AmlStart);
 216     if (!ParseRoot)
 217     {
 218         return_ACPI_STATUS (AE_NO_MEMORY);
 219     }
 220
 221     /* Create and initialize a new walk state */
 222
 223     WalkState = AcpiDsCreateWalkState (OwnerId, NULL, NULL, NULL);
 224     if (!WalkState)
 225     {
 226         AcpiPsFreeOp (ParseRoot);
 227         return_ACPI_STATUS (AE_NO_MEMORY);
 228     }
 229
 230     Status = AcpiDsInitAmlWalk (WalkState, ParseRoot, NULL,
 231         AmlStart, AmlLength, NULL, (UINT8) PassNumber);
 232     if (ACPI_FAILURE (Status))
 233     {
 234         AcpiDsDeleteWalkState (WalkState);
 235         goto Cleanup;
 236     }
 237
 238     /* Found OSDT table, enable the namespace override feature */
 239
 240     if (ACPI_COMPARE_NAME(Table->Signature, ACPI_SIG_OSDT) &&
 241         PassNumber == ACPI_IMODE_LOAD_PASS1)
 242     {
 243         WalkState->NamespaceOverride = TRUE;
 244     }
 245
 246     /* StartNode is the default location to load the table  */
 247
 248     if (StartNode && StartNode != AcpiGbl_RootNode)
 249     {
 250         Status = AcpiDsScopeStackPush (
 251             StartNode, ACPI_TYPE_METHOD, WalkState);
 252         if (ACPI_FAILURE (Status))
 253         {
 254             AcpiDsDeleteWalkState (WalkState);
 255             goto Cleanup;
 256         }
 257     }
 258
 259     /* Parse the AML */
 260
 261     ACPI_DEBUG_PRINT ((ACPI_DB_PARSE,
 262         "*PARSE* pass %u parse\n", PassNumber));
 263     AcpiExEnterInterpreter ();
 264     Status = AcpiPsParseAml (WalkState);
 265     AcpiExExitInterpreter ();
 266
 267 Cleanup:
 268     AcpiPsDeleteParseTree (ParseRoot);
 269     return_ACPI_STATUS (Status);
 270 }
 271
 272
 273 /*******************************************************************************
 274  *
 275  * FUNCTION:    AcpiNsParseTable
 276  *
 277  * PARAMETERS:  TableDesc       - An ACPI table descriptor for table to parse
 278  *              StartNode       - Where to enter the table into the namespace
 279  *
 280  * RETURN:      Status
 281  *
 282  * DESCRIPTION: Parse AML within an ACPI table and return a tree of ops
 283  *
 284  ******************************************************************************/
 285
 286 ACPI_STATUS
 287 AcpiNsParseTable (
 288     UINT32                  TableIndex,
 289     ACPI_NAMESPACE_NODE     *StartNode)
 290 {
 291     ACPI_STATUS             Status;
 292
 293
 294     ACPI_FUNCTION_TRACE (NsParseTable);
 295
 296
 297     if (AcpiGbl_ParseTableAsTermList)
 298     {
 299         ACPI_DEBUG_PRINT ((ACPI_DB_PARSE, "**** Start load pass\n"));
 300
 301         Status = AcpiNsExecuteTable (TableIndex, StartNode);
 302         if (ACPI_FAILURE (Status))
 303         {
 304             return_ACPI_STATUS (Status);
 305         }
 306     }
 307     else
 308     {
 309         /*
 310          * AML Parse, pass 1
 311          *
 312          * In this pass, we load most of the namespace. Control methods
 313          * are not parsed until later. A parse tree is not created.
 314          * Instead, each Parser Op subtree is deleted when it is finished.
 315          * This saves a great deal of memory, and allows a small cache of
 316          * parse objects to service the entire parse. The second pass of
 317          * the parse then performs another complete parse of the AML.
 318          */
 319         ACPI_DEBUG_PRINT ((ACPI_DB_PARSE, "**** Start pass 1\n"));
 320
 321         Status = AcpiNsOneCompleteParse (ACPI_IMODE_LOAD_PASS1,
 322             TableIndex, StartNode);
 323         if (ACPI_FAILURE (Status))
 324         {
 325             return_ACPI_STATUS (Status);
 326         }
 327
 328         /*
 329          * AML Parse, pass 2
 330          *
 331          * In this pass, we resolve forward references and other things
 332          * that could not be completed during the first pass.
 333          * Another complete parse of the AML is performed, but the
 334          * overhead of this is compensated for by the fact that the
 335          * parse objects are all cached.
 336          */
 337         ACPI_DEBUG_PRINT ((ACPI_DB_PARSE, "**** Start pass 2\n"));
 338         Status = AcpiNsOneCompleteParse (ACPI_IMODE_LOAD_PASS2,
 339             TableIndex, StartNode);
 340         if (ACPI_FAILURE (Status))
 341         {
 342             return_ACPI_STATUS (Status);
 343         }
 344     }
 345
 346     return_ACPI_STATUS (Status);
 347 }