reactos/drivers/bus/acpi/acpica/executer/exstoren.c

   1 /******************************************************************************
   2  *
   3  * Module Name: exstoren - AML Interpreter object store support,
   4  *                        Store to Node (namespace object)
   5  *
   6  *****************************************************************************/
   7
   8 /*
   9  * Copyright (C) 2000 - 2017, Intel Corp.
  10  * All rights reserved.
  11  *
  12  * Redistribution and use in source and binary forms, with or without
  13  * modification, are permitted provided that the following conditions
  14  * are met:
  15  * 1. Redistributions of source code must retain the above copyright
  16  *    notice, this list of conditions, and the following disclaimer,
  17  *    without modification.
  18  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  19  *    substantially similar to the "NO WARRANTY" disclaimer below
  20  *    ("Disclaimer") and any redistribution must be conditioned upon
  21  *    including a substantially similar Disclaimer requirement for further
  22  *    binary redistribution.
  23  * 3. Neither the names of the above-listed copyright holders nor the names
  24  *    of any contributors may be used to endorse or promote products derived
  25  *    from this software without specific prior written permission.
  26  *
  27  * Alternatively, this software may be distributed under the terms of the
  28  * GNU General Public License ("GPL") version 2 as published by the Free
  29  * Software Foundation.
  30  *
  31  * NO WARRANTY
  32  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  33  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  34  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  35  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  36  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  37  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  38  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  39  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  40  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  41  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  42  * POSSIBILITY OF SUCH DAMAGES.
  43  */
  44
  45 #include "acpi.h"
  46 #include "accommon.h"
  47 #include "acinterp.h"
  48 #include "amlcode.h"
  49
  50
  51 #define _COMPONENT          ACPI_EXECUTER
  52         ACPI_MODULE_NAME    ("exstoren")
  53
  54
  55 /*******************************************************************************
  56  *
  57  * FUNCTION:    AcpiExResolveObject
  58  *
  59  * PARAMETERS:  SourceDescPtr       - Pointer to the source object
  60  *              TargetType          - Current type of the target
  61  *              WalkState           - Current walk state
  62  *
  63  * RETURN:      Status, resolved object in SourceDescPtr.
  64  *
  65  * DESCRIPTION: Resolve an object. If the object is a reference, dereference
  66  *              it and return the actual object in the SourceDescPtr.
  67  *
  68  ******************************************************************************/
  69
  70 ACPI_STATUS
  71 AcpiExResolveObject (
  72     ACPI_OPERAND_OBJECT     **SourceDescPtr,
  73     ACPI_OBJECT_TYPE        TargetType,
  74     ACPI_WALK_STATE         *WalkState)
  75 {
  76     ACPI_OPERAND_OBJECT     *SourceDesc = *SourceDescPtr;
  77     ACPI_STATUS             Status = AE_OK;
  78
  79
  80     ACPI_FUNCTION_TRACE (ExResolveObject);
  81
  82
  83     /* Ensure we have a Target that can be stored to */
  84
  85     switch (TargetType)
  86     {
  87     case ACPI_TYPE_BUFFER_FIELD:
  88     case ACPI_TYPE_LOCAL_REGION_FIELD:
  89     case ACPI_TYPE_LOCAL_BANK_FIELD:
  90     case ACPI_TYPE_LOCAL_INDEX_FIELD:
  91         /*
  92          * These cases all require only Integers or values that
  93          * can be converted to Integers (Strings or Buffers)
  94          */
  95     case ACPI_TYPE_INTEGER:
  96     case ACPI_TYPE_STRING:
  97     case ACPI_TYPE_BUFFER:
  98         /*
  99          * Stores into a Field/Region or into a Integer/Buffer/String
 100          * are all essentially the same. This case handles the
 101          * "interchangeable" types Integer, String, and Buffer.
 102          */
 103         if (SourceDesc->Common.Type == ACPI_TYPE_LOCAL_REFERENCE)
 104         {
 105             /* Resolve a reference object first */
 106
 107             Status = AcpiExResolveToValue (SourceDescPtr, WalkState);
 108             if (ACPI_FAILURE (Status))
 109             {
 110                 break;
 111             }
 112         }
 113
 114         /* For CopyObject, no further validation necessary */
 115
 116         if (WalkState->Opcode == AML_COPY_OP)
 117         {
 118             break;
 119         }
 120
 121         /* Must have a Integer, Buffer, or String */
 122
 123         if ((SourceDesc->Common.Type != ACPI_TYPE_INTEGER)    &&
 124             (SourceDesc->Common.Type != ACPI_TYPE_BUFFER)     &&
 125             (SourceDesc->Common.Type != ACPI_TYPE_STRING)     &&
 126             !((SourceDesc->Common.Type == ACPI_TYPE_LOCAL_REFERENCE) &&
 127                 (SourceDesc->Reference.Class== ACPI_REFCLASS_TABLE)))
 128         {
 129             /* Conversion successful but still not a valid type */
 130
 131             ACPI_ERROR ((AE_INFO,
 132                 "Cannot assign type [%s] to [%s] (must be type Int/Str/Buf)",
 133                 AcpiUtGetObjectTypeName (SourceDesc),
 134                 AcpiUtGetTypeName (TargetType)));
 135
 136             Status = AE_AML_OPERAND_TYPE;
 137         }
 138         break;
 139
 140     case ACPI_TYPE_LOCAL_ALIAS:
 141     case ACPI_TYPE_LOCAL_METHOD_ALIAS:
 142         /*
 143          * All aliases should have been resolved earlier, during the
 144          * operand resolution phase.
 145          */
 146         ACPI_ERROR ((AE_INFO, "Store into an unresolved Alias object"));
 147         Status = AE_AML_INTERNAL;
 148         break;
 149
 150     case ACPI_TYPE_PACKAGE:
 151     default:
 152         /*
 153          * All other types than Alias and the various Fields come here,
 154          * including the untyped case - ACPI_TYPE_ANY.
 155          */
 156         break;
 157     }
 158
 159     return_ACPI_STATUS (Status);
 160 }
 161
 162
 163 /*******************************************************************************
 164  *
 165  * FUNCTION:    AcpiExStoreObjectToObject
 166  *
 167  * PARAMETERS:  SourceDesc          - Object to store
 168  *              DestDesc            - Object to receive a copy of the source
 169  *              NewDesc             - New object if DestDesc is obsoleted
 170  *              WalkState           - Current walk state
 171  *
 172  * RETURN:      Status
 173  *
 174  * DESCRIPTION: "Store" an object to another object. This may include
 175  *              converting the source type to the target type (implicit
 176  *              conversion), and a copy of the value of the source to
 177  *              the target.
 178  *
 179  *              The Assignment of an object to another (not named) object
 180  *              is handled here.
 181  *              The Source passed in will replace the current value (if any)
 182  *              with the input value.
 183  *
 184  *              When storing into an object the data is converted to the
 185  *              target object type then stored in the object. This means
 186  *              that the target object type (for an initialized target) will
 187  *              not be changed by a store operation.
 188  *
 189  *              This module allows destination types of Number, String,
 190  *              Buffer, and Package.
 191  *
 192  *              Assumes parameters are already validated. NOTE: SourceDesc
 193  *              resolution (from a reference object) must be performed by
 194  *              the caller if necessary.
 195  *
 196  ******************************************************************************/
 197
 198 ACPI_STATUS
 199 AcpiExStoreObjectToObject (
 200     ACPI_OPERAND_OBJECT     *SourceDesc,
 201     ACPI_OPERAND_OBJECT     *DestDesc,
 202     ACPI_OPERAND_OBJECT     **NewDesc,
 203     ACPI_WALK_STATE         *WalkState)
 204 {
 205     ACPI_OPERAND_OBJECT     *ActualSrcDesc;
 206     ACPI_STATUS             Status = AE_OK;
 207
 208
 209     ACPI_FUNCTION_TRACE_PTR (ExStoreObjectToObject, SourceDesc);
 210
 211
 212     ActualSrcDesc = SourceDesc;
 213     if (!DestDesc)
 214     {
 215         /*
 216          * There is no destination object (An uninitialized node or
 217          * package element), so we can simply copy the source object
 218          * creating a new destination object
 219          */
 220         Status = AcpiUtCopyIobjectToIobject (ActualSrcDesc, NewDesc, WalkState);
 221         return_ACPI_STATUS (Status);
 222     }
 223
 224     if (SourceDesc->Common.Type != DestDesc->Common.Type)
 225     {
 226         /*
 227          * The source type does not match the type of the destination.
 228          * Perform the "implicit conversion" of the source to the current type
 229          * of the target as per the ACPI specification.
 230          *
 231          * If no conversion performed, ActualSrcDesc = SourceDesc.
 232          * Otherwise, ActualSrcDesc is a temporary object to hold the
 233          * converted object.
 234          */
 235         Status = AcpiExConvertToTargetType (DestDesc->Common.Type,
 236             SourceDesc, &ActualSrcDesc, WalkState);
 237         if (ACPI_FAILURE (Status))
 238         {
 239             return_ACPI_STATUS (Status);
 240         }
 241
 242         if (SourceDesc == ActualSrcDesc)
 243         {
 244             /*
 245              * No conversion was performed. Return the SourceDesc as the
 246              * new object.
 247              */
 248             *NewDesc = SourceDesc;
 249             return_ACPI_STATUS (AE_OK);
 250         }
 251     }
 252
 253     /*
 254      * We now have two objects of identical types, and we can perform a
 255      * copy of the *value* of the source object.
 256      */
 257     switch (DestDesc->Common.Type)
 258     {
 259     case ACPI_TYPE_INTEGER:
 260
 261         DestDesc->Integer.Value = ActualSrcDesc->Integer.Value;
 262
 263         /* Truncate value if we are executing from a 32-bit ACPI table */
 264
 265         (void) AcpiExTruncateFor32bitTable (DestDesc);
 266         break;
 267
 268     case ACPI_TYPE_STRING:
 269
 270         Status = AcpiExStoreStringToString (ActualSrcDesc, DestDesc);
 271         break;
 272
 273     case ACPI_TYPE_BUFFER:
 274
 275         Status = AcpiExStoreBufferToBuffer (ActualSrcDesc, DestDesc);
 276         break;
 277
 278     case ACPI_TYPE_PACKAGE:
 279
 280         Status = AcpiUtCopyIobjectToIobject (ActualSrcDesc, &DestDesc,
 281                     WalkState);
 282         break;
 283
 284     default:
 285         /*
 286          * All other types come here.
 287          */
 288         ACPI_WARNING ((AE_INFO, "Store into type [%s] not implemented",
 289             AcpiUtGetObjectTypeName (DestDesc)));
 290
 291         Status = AE_NOT_IMPLEMENTED;
 292         break;
 293     }
 294
 295     if (ActualSrcDesc != SourceDesc)
 296     {
 297         /* Delete the intermediate (temporary) source object */
 298
 299         AcpiUtRemoveReference (ActualSrcDesc);
 300     }
 301
 302     *NewDesc = DestDesc;
 303     return_ACPI_STATUS (Status);
 304 }