err.no Git - linux-2.6/blob - drivers/acpi/executer/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 - 2006, R. Byron Moore
  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 <acpi/acinterp.h>
  48 #include <acpi/amlcode.h>
  49
  50 #define _COMPONENT          ACPI_EXECUTER
  51 ACPI_MODULE_NAME("exstoren")
  52
  53 /*******************************************************************************
  54  *
  55  * FUNCTION:    acpi_ex_resolve_object
  56  *
  57  * PARAMETERS:  source_desc_ptr     - Pointer to the source object
  58  *              target_type         - Current type of the target
  59  *              walk_state          - Current walk state
  60  *
  61  * RETURN:      Status, resolved object in source_desc_ptr.
  62  *
  63  * DESCRIPTION: Resolve an object.  If the object is a reference, dereference
  64  *              it and return the actual object in the source_desc_ptr.
  65  *
  66  ******************************************************************************/
  67 acpi_status
  68 acpi_ex_resolve_object(union acpi_operand_object **source_desc_ptr,
  69                        acpi_object_type target_type,
  70                        struct acpi_walk_state *walk_state)
  71 {
  72         union acpi_operand_object *source_desc = *source_desc_ptr;
  73         acpi_status status = AE_OK;
  74
  75         ACPI_FUNCTION_TRACE("ex_resolve_object");
  76
  77         /* Ensure we have a Target that can be stored to */
  78
  79         switch (target_type) {
  80         case ACPI_TYPE_BUFFER_FIELD:
  81         case ACPI_TYPE_LOCAL_REGION_FIELD:
  82         case ACPI_TYPE_LOCAL_BANK_FIELD:
  83         case ACPI_TYPE_LOCAL_INDEX_FIELD:
  84                 /*
  85                  * These cases all require only Integers or values that
  86                  * can be converted to Integers (Strings or Buffers)
  87                  */
  88
  89         case ACPI_TYPE_INTEGER:
  90         case ACPI_TYPE_STRING:
  91         case ACPI_TYPE_BUFFER:
  92
  93                 /*
  94                  * Stores into a Field/Region or into a Integer/Buffer/String
  95                  * are all essentially the same.  This case handles the
  96                  * "interchangeable" types Integer, String, and Buffer.
  97                  */
  98                 if (ACPI_GET_OBJECT_TYPE(source_desc) ==
  99                     ACPI_TYPE_LOCAL_REFERENCE) {
 100                         /* Resolve a reference object first */
 101
 102                         status =
 103                             acpi_ex_resolve_to_value(source_desc_ptr,
 104                                                      walk_state);
 105                         if (ACPI_FAILURE(status)) {
 106                                 break;
 107                         }
 108                 }
 109
 110                 /* For copy_object, no further validation necessary */
 111
 112                 if (walk_state->opcode == AML_COPY_OP) {
 113                         break;
 114                 }
 115
 116                 /* Must have a Integer, Buffer, or String */
 117
 118                 if ((ACPI_GET_OBJECT_TYPE(source_desc) != ACPI_TYPE_INTEGER) &&
 119                     (ACPI_GET_OBJECT_TYPE(source_desc) != ACPI_TYPE_BUFFER) &&
 120                     (ACPI_GET_OBJECT_TYPE(source_desc) != ACPI_TYPE_STRING) &&
 121                     !((ACPI_GET_OBJECT_TYPE(source_desc) ==
 122                        ACPI_TYPE_LOCAL_REFERENCE)
 123                       && (source_desc->reference.opcode == AML_LOAD_OP))) {
 124                         /* Conversion successful but still not a valid type */
 125
 126                         ACPI_ERROR((AE_INFO,
 127                                     "Cannot assign type %s to %s (must be type Int/Str/Buf)",
 128                                     acpi_ut_get_object_type_name(source_desc),
 129                                     acpi_ut_get_type_name(target_type)));
 130                         status = AE_AML_OPERAND_TYPE;
 131                 }
 132                 break;
 133
 134         case ACPI_TYPE_LOCAL_ALIAS:
 135         case ACPI_TYPE_LOCAL_METHOD_ALIAS:
 136
 137                 /*
 138                  * All aliases should have been resolved earlier, during the
 139                  * operand resolution phase.
 140                  */
 141                 ACPI_ERROR((AE_INFO, "Store into an unresolved Alias object"));
 142                 status = AE_AML_INTERNAL;
 143                 break;
 144
 145         case ACPI_TYPE_PACKAGE:
 146         default:
 147
 148                 /*
 149                  * All other types than Alias and the various Fields come here,
 150                  * including the untyped case - ACPI_TYPE_ANY.
 151                  */
 152                 break;
 153         }
 154
 155         return_ACPI_STATUS(status);
 156 }
 157
 158 /*******************************************************************************
 159  *
 160  * FUNCTION:    acpi_ex_store_object_to_object
 161  *
 162  * PARAMETERS:  source_desc         - Object to store
 163  *              dest_desc           - Object to receive a copy of the source
 164  *              new_desc            - New object if dest_desc is obsoleted
 165  *              walk_state          - Current walk state
 166  *
 167  * RETURN:      Status
 168  *
 169  * DESCRIPTION: "Store" an object to another object.  This may include
 170  *              converting the source type to the target type (implicit
 171  *              conversion), and a copy of the value of the source to
 172  *              the target.
 173  *
 174  *              The Assignment of an object to another (not named) object
 175  *              is handled here.
 176  *              The Source passed in will replace the current value (if any)
 177  *              with the input value.
 178  *
 179  *              When storing into an object the data is converted to the
 180  *              target object type then stored in the object.  This means
 181  *              that the target object type (for an initialized target) will
 182  *              not be changed by a store operation.
 183  *
 184  *              This module allows destination types of Number, String,
 185  *              Buffer, and Package.
 186  *
 187  *              Assumes parameters are already validated.  NOTE: source_desc
 188  *              resolution (from a reference object) must be performed by
 189  *              the caller if necessary.
 190  *
 191  ******************************************************************************/
 192
 193 acpi_status
 194 acpi_ex_store_object_to_object(union acpi_operand_object *source_desc,
 195                                union acpi_operand_object *dest_desc,
 196                                union acpi_operand_object **new_desc,
 197                                struct acpi_walk_state *walk_state)
 198 {
 199         union acpi_operand_object *actual_src_desc;
 200         acpi_status status = AE_OK;
 201
 202         ACPI_FUNCTION_TRACE_PTR("ex_store_object_to_object", source_desc);
 203
 204         actual_src_desc = source_desc;
 205         if (!dest_desc) {
 206                 /*
 207                  * There is no destination object (An uninitialized node or
 208                  * package element), so we can simply copy the source object
 209                  * creating a new destination object
 210                  */
 211                 status =
 212                     acpi_ut_copy_iobject_to_iobject(actual_src_desc, new_desc,
 213                                                     walk_state);
 214                 return_ACPI_STATUS(status);
 215         }
 216
 217         if (ACPI_GET_OBJECT_TYPE(source_desc) !=
 218             ACPI_GET_OBJECT_TYPE(dest_desc)) {
 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 =
 229                     acpi_ex_convert_to_target_type(ACPI_GET_OBJECT_TYPE
 230                                                    (dest_desc), source_desc,
 231                                                    &actual_src_desc,
 232                                                    walk_state);
 233                 if (ACPI_FAILURE(status)) {
 234                         return_ACPI_STATUS(status);
 235                 }
 236
 237                 if (source_desc == actual_src_desc) {
 238                         /*
 239                          * No conversion was performed. Return the source_desc as the
 240                          * new object.
 241                          */
 242                         *new_desc = source_desc;
 243                         return_ACPI_STATUS(AE_OK);
 244                 }
 245         }
 246
 247         /*
 248          * We now have two objects of identical types, and we can perform a
 249          * copy of the *value* of the source object.
 250          */
 251         switch (ACPI_GET_OBJECT_TYPE(dest_desc)) {
 252         case ACPI_TYPE_INTEGER:
 253
 254                 dest_desc->integer.value = actual_src_desc->integer.value;
 255
 256                 /* Truncate value if we are executing from a 32-bit ACPI table */
 257
 258                 acpi_ex_truncate_for32bit_table(dest_desc);
 259                 break;
 260
 261         case ACPI_TYPE_STRING:
 262
 263                 status =
 264                     acpi_ex_store_string_to_string(actual_src_desc, dest_desc);
 265                 break;
 266
 267         case ACPI_TYPE_BUFFER:
 268
 269                 status =
 270                     acpi_ex_store_buffer_to_buffer(actual_src_desc, dest_desc);
 271                 break;
 272
 273         case ACPI_TYPE_PACKAGE:
 274
 275                 status =
 276                     acpi_ut_copy_iobject_to_iobject(actual_src_desc, &dest_desc,
 277                                                     walk_state);
 278                 break;
 279
 280         default:
 281                 /*
 282                  * All other types come here.
 283                  */
 284                 ACPI_WARNING((AE_INFO, "Store into type %s not implemented",
 285                               acpi_ut_get_object_type_name(dest_desc)));
 286
 287                 status = AE_NOT_IMPLEMENTED;
 288                 break;
 289         }
 290
 291         if (actual_src_desc != source_desc) {
 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 }