drivers/acpi/acpica/exstoren.c

   1
   2 /******************************************************************************
   3  *
   4  * Module Name: exstoren - AML Interpreter object store support,
   5  *                        Store to Node (namespace object)
   6  *
   7  *****************************************************************************/
   8
   9 /*
  10  * Copyright (C) 2000 - 2011, Intel Corp.
  11  * All rights reserved.
  12  *
  13  * Redistribution and use in source and binary forms, with or without
  14  * modification, are permitted provided that the following conditions
  15  * are met:
  16  * 1. Redistributions of source code must retain the above copyright
  17  *    notice, this list of conditions, and the following disclaimer,
  18  *    without modification.
  19  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  20  *    substantially similar to the "NO WARRANTY" disclaimer below
  21  *    ("Disclaimer") and any redistribution must be conditioned upon
  22  *    including a substantially similar Disclaimer requirement for further
  23  *    binary redistribution.
  24  * 3. Neither the names of the above-listed copyright holders nor the names
  25  *    of any contributors may be used to endorse or promote products derived
  26  *    from this software without specific prior written permission.
  27  *
  28  * Alternatively, this software may be distributed under the terms of the
  29  * GNU General Public License ("GPL") version 2 as published by the Free
  30  * Software Foundation.
  31  *
  32  * NO WARRANTY
  33  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  34  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  35  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  36  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  37  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  38  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  39  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  40  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  41  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  42  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  43  * POSSIBILITY OF SUCH DAMAGES.
  44  */
  45
  46 #include <acpi/acpi.h>
  47 #include "accommon.h"
  48 #include "acinterp.h"
  49 #include "amlcode.h"
  50
  51 #define _COMPONENT          ACPI_EXECUTER
  52 ACPI_MODULE_NAME("exstoren")
  53
  54 /*******************************************************************************
  55  *
  56  * FUNCTION:    acpi_ex_resolve_object
  57  *
  58  * PARAMETERS:  source_desc_ptr     - Pointer to the source object
  59  *              target_type         - Current type of the target
  60  *              walk_state          - Current walk state
  61  *
  62  * RETURN:      Status, resolved object in source_desc_ptr.
  63  *
  64  * DESCRIPTION: Resolve an object.  If the object is a reference, dereference
  65  *              it and return the actual object in the source_desc_ptr.
  66  *
  67  ******************************************************************************/
  68 acpi_status
  69 acpi_ex_resolve_object(union acpi_operand_object **source_desc_ptr,
  70                        acpi_object_type target_type,
  71                        struct acpi_walk_state *walk_state)
  72 {
  73         union acpi_operand_object *source_desc = *source_desc_ptr;
  74         acpi_status status = AE_OK;
  75
  76         ACPI_FUNCTION_TRACE(ex_resolve_object);
  77
  78         /* Ensure we have a Target that can be stored to */
  79
  80         switch (target_type) {
  81         case ACPI_TYPE_BUFFER_FIELD:
  82         case ACPI_TYPE_LOCAL_REGION_FIELD:
  83         case ACPI_TYPE_LOCAL_BANK_FIELD:
  84         case ACPI_TYPE_LOCAL_INDEX_FIELD:
  85                 /*
  86                  * These cases all require only Integers or values that
  87                  * can be converted to Integers (Strings or Buffers)
  88                  */
  89
  90         case ACPI_TYPE_INTEGER:
  91         case ACPI_TYPE_STRING:
  92         case ACPI_TYPE_BUFFER:
  93
  94                 /*
  95                  * Stores into a Field/Region or into a Integer/Buffer/String
  96                  * are all essentially the same.  This case handles the
  97                  * "interchangeable" types Integer, String, and Buffer.
  98                  */
  99                 if (source_desc->common.type == ACPI_TYPE_LOCAL_REFERENCE) {
 100
 101                         /* Resolve a reference object first */
 102
 103                         status =
 104                             acpi_ex_resolve_to_value(source_desc_ptr,
 105                                                      walk_state);
 106                         if (ACPI_FAILURE(status)) {
 107                                 break;
 108                         }
 109                 }
 110
 111                 /* For copy_object, no further validation necessary */
 112
 113                 if (walk_state->opcode == AML_COPY_OP) {
 114                         break;
 115                 }
 116
 117                 /* Must have a Integer, Buffer, or String */
 118
 119                 if ((source_desc->common.type != ACPI_TYPE_INTEGER) &&
 120                     (source_desc->common.type != ACPI_TYPE_BUFFER) &&
 121                     (source_desc->common.type != ACPI_TYPE_STRING) &&
 122                     !((source_desc->common.type == ACPI_TYPE_LOCAL_REFERENCE) &&
 123                       (source_desc->reference.class == ACPI_REFCLASS_TABLE))) {
 124
 125                         /* Conversion successful but still not a valid type */
 126
 127                         ACPI_ERROR((AE_INFO,
 128                                     "Cannot assign type %s to %s (must be type Int/Str/Buf)",
 129                                     acpi_ut_get_object_type_name(source_desc),
 130                                     acpi_ut_get_type_name(target_type)));
 131                         status = AE_AML_OPERAND_TYPE;
 132                 }
 133                 break;
 134
 135         case ACPI_TYPE_LOCAL_ALIAS:
 136         case ACPI_TYPE_LOCAL_METHOD_ALIAS:
 137
 138                 /*
 139                  * All aliases should have been resolved earlier, during the
 140                  * operand resolution phase.
 141                  */
 142                 ACPI_ERROR((AE_INFO, "Store into an unresolved Alias object"));
 143                 status = AE_AML_INTERNAL;
 144                 break;
 145
 146         case ACPI_TYPE_PACKAGE:
 147         default:
 148
 149                 /*
 150                  * All other types than Alias and the various Fields come here,
 151                  * including the untyped case - ACPI_TYPE_ANY.
 152                  */
 153                 break;
 154         }
 155
 156         return_ACPI_STATUS(status);
 157 }
 158
 159 /*******************************************************************************
 160  *
 161  * FUNCTION:    acpi_ex_store_object_to_object
 162  *
 163  * PARAMETERS:  source_desc         - Object to store
 164  *              dest_desc           - Object to receive a copy of the source
 165  *              new_desc            - New object if dest_desc is obsoleted
 166  *              walk_state          - Current walk state
 167  *
 168  * RETURN:      Status
 169  *
 170  * DESCRIPTION: "Store" an object to another object.  This may include
 171  *              converting the source type to the target type (implicit
 172  *              conversion), and a copy of the value of the source to
 173  *              the target.
 174  *
 175  *              The Assignment of an object to another (not named) object
 176  *              is handled here.
 177  *              The Source passed in will replace the current value (if any)
 178  *              with the input value.
 179  *
 180  *              When storing into an object the data is converted to the
 181  *              target object type then stored in the object.  This means
 182  *              that the target object type (for an initialized target) will
 183  *              not be changed by a store operation.
 184  *
 185  *              This module allows destination types of Number, String,
 186  *              Buffer, and Package.
 187  *
 188  *              Assumes parameters are already validated.  NOTE: source_desc
 189  *              resolution (from a reference object) must be performed by
 190  *              the caller if necessary.
 191  *
 192  ******************************************************************************/
 193
 194 acpi_status
 195 acpi_ex_store_object_to_object(union acpi_operand_object *source_desc,
 196                                union acpi_operand_object *dest_desc,
 197                                union acpi_operand_object **new_desc,
 198                                struct acpi_walk_state *walk_state)
 199 {
 200         union acpi_operand_object *actual_src_desc;
 201         acpi_status status = AE_OK;
 202
 203         ACPI_FUNCTION_TRACE_PTR(ex_store_object_to_object, source_desc);
 204
 205         actual_src_desc = source_desc;
 206         if (!dest_desc) {
 207                 /*
 208                  * There is no destination object (An uninitialized node or
 209                  * package element), so we can simply copy the source object
 210                  * creating a new destination object
 211                  */
 212                 status =
 213                     acpi_ut_copy_iobject_to_iobject(actual_src_desc, new_desc,
 214                                                     walk_state);
 215                 return_ACPI_STATUS(status);
 216         }
 217
 218         if (source_desc->common.type != dest_desc->common.type) {
 219                 /*
 220                  * The source type does not match the type of the destination.
 221                  * Perform the "implicit conversion" of the source to the current type
 222                  * of the target as per the ACPI specification.
 223                  *
 224                  * If no conversion performed, actual_src_desc = source_desc.
 225                  * Otherwise, actual_src_desc is a temporary object to hold the
 226                  * converted object.
 227                  */
 228                 status = acpi_ex_convert_to_target_type(dest_desc->common.type,
 229                                                         source_desc,
 230                                                         &actual_src_desc,
 231                                                         walk_state);
 232                 if (ACPI_FAILURE(status)) {
 233                         return_ACPI_STATUS(status);
 234                 }
 235
 236                 if (source_desc == actual_src_desc) {
 237                         /*
 238                          * No conversion was performed. Return the source_desc as the
 239                          * new object.
 240                          */
 241                         *new_desc = source_desc;
 242                         return_ACPI_STATUS(AE_OK);
 243                 }
 244         }
 245
 246         /*
 247          * We now have two objects of identical types, and we can perform a
 248          * copy of the *value* of the source object.
 249          */
 250         switch (dest_desc->common.type) {
 251         case ACPI_TYPE_INTEGER:
 252
 253                 dest_desc->integer.value = actual_src_desc->integer.value;
 254
 255                 /* Truncate value if we are executing from a 32-bit ACPI table */
 256
 257                 acpi_ex_truncate_for32bit_table(dest_desc);
 258                 break;
 259
 260         case ACPI_TYPE_STRING:
 261
 262                 status =
 263                     acpi_ex_store_string_to_string(actual_src_desc, dest_desc);
 264                 break;
 265
 266         case ACPI_TYPE_BUFFER:
 267
 268                 status =
 269                     acpi_ex_store_buffer_to_buffer(actual_src_desc, dest_desc);
 270                 break;
 271
 272         case ACPI_TYPE_PACKAGE:
 273
 274                 status =
 275                     acpi_ut_copy_iobject_to_iobject(actual_src_desc, &dest_desc,
 276                                                     walk_state);
 277                 break;
 278
 279         default:
 280                 /*
 281                  * All other types come here.
 282                  */
 283                 ACPI_WARNING((AE_INFO, "Store into type %s not implemented",
 284                               acpi_ut_get_object_type_name(dest_desc)));
 285
 286                 status = AE_NOT_IMPLEMENTED;
 287                 break;
 288         }
 289
 290         if (actual_src_desc != source_desc) {
 291
 292                 /* Delete the intermediate (temporary) source object */
 293
 294                 acpi_ut_remove_reference(actual_src_desc);
 295         }
 296
 297         *new_desc = dest_desc;
 298         return_ACPI_STATUS(status);
 299 }