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 - 2005, 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
  47 #include <acpi/acpi.h>
  48 #include <acpi/acinterp.h>
  49 #include <acpi/amlcode.h>
  50
  51
  52 #define _COMPONENT          ACPI_EXECUTER
  53          ACPI_MODULE_NAME    ("exstoren")
  54
  55
  56 /*******************************************************************************
  57  *
  58  * FUNCTION:    acpi_ex_resolve_object
  59  *
  60  * PARAMETERS:  source_desc_ptr     - Pointer to the source object
  61  *              target_type         - Current type of the target
  62  *              walk_state          - Current walk state
  63  *
  64  * RETURN:      Status, resolved object in source_desc_ptr.
  65  *
  66  * DESCRIPTION: Resolve an object.  If the object is a reference, dereference
  67  *              it and return the actual object in the source_desc_ptr.
  68  *
  69  ******************************************************************************/
  70
  71 acpi_status
  72 acpi_ex_resolve_object (
  73         union acpi_operand_object       **source_desc_ptr,
  74         acpi_object_type                target_type,
  75         struct acpi_walk_state          *walk_state)
  76 {
  77         union acpi_operand_object       *source_desc = *source_desc_ptr;
  78         acpi_status                     status = AE_OK;
  79
  80
  81         ACPI_FUNCTION_TRACE ("ex_resolve_object");
  82
  83
  84         /* Ensure we have a Target that can be stored to */
  85
  86         switch (target_type) {
  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
  96         case ACPI_TYPE_INTEGER:
  97         case ACPI_TYPE_STRING:
  98         case ACPI_TYPE_BUFFER:
  99
 100                 /*
 101                  * Stores into a Field/Region or into a Integer/Buffer/String
 102                  * are all essentially the same.  This case handles the
 103                  * "interchangeable" types Integer, String, and Buffer.
 104                  */
 105                 if (ACPI_GET_OBJECT_TYPE (source_desc) == ACPI_TYPE_LOCAL_REFERENCE) {
 106                         /* Resolve a reference object first */
 107
 108                         status = acpi_ex_resolve_to_value (source_desc_ptr, walk_state);
 109                         if (ACPI_FAILURE (status)) {
 110                                 break;
 111                         }
 112                 }
 113
 114                 /* For copy_object, no further validation necessary */
 115
 116                 if (walk_state->opcode == AML_COPY_OP) {
 117                         break;
 118                 }
 119
 120                 /* Must have a Integer, Buffer, or String */
 121
 122                 if ((ACPI_GET_OBJECT_TYPE (source_desc) != ACPI_TYPE_INTEGER)   &&
 123                         (ACPI_GET_OBJECT_TYPE (source_desc) != ACPI_TYPE_BUFFER)    &&
 124                         (ACPI_GET_OBJECT_TYPE (source_desc) != ACPI_TYPE_STRING)    &&
 125                         !((ACPI_GET_OBJECT_TYPE (source_desc) == ACPI_TYPE_LOCAL_REFERENCE) && (source_desc->reference.opcode == AML_LOAD_OP))) {
 126                         /* Conversion successful but still not a valid type */
 127
 128                         ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
 129                                 "Cannot assign type %s to %s (must be type Int/Str/Buf)\n",
 130                                 acpi_ut_get_object_type_name (source_desc),
 131                                 acpi_ut_get_type_name (target_type)));
 132                         status = AE_AML_OPERAND_TYPE;
 133                 }
 134                 break;
 135
 136
 137         case ACPI_TYPE_LOCAL_ALIAS:
 138         case ACPI_TYPE_LOCAL_METHOD_ALIAS:
 139
 140                 /* Aliases are resolved by acpi_ex_prep_operands */
 141
 142                 ACPI_REPORT_ERROR (("Store into Alias - should never happen\n"));
 143                 status = AE_AML_INTERNAL;
 144                 break;
 145
 146
 147         case ACPI_TYPE_PACKAGE:
 148         default:
 149
 150                 /*
 151                  * All other types than Alias and the various Fields come here,
 152                  * including the untyped case - ACPI_TYPE_ANY.
 153                  */
 154                 break;
 155         }
 156
 157         return_ACPI_STATUS (status);
 158 }
 159
 160
 161 /*******************************************************************************
 162  *
 163  * FUNCTION:    acpi_ex_store_object_to_object
 164  *
 165  * PARAMETERS:  source_desc         - Object to store
 166  *              dest_desc           - Object to receive a copy of the source
 167  *              new_desc            - New object if dest_desc is obsoleted
 168  *              walk_state          - Current walk state
 169  *
 170  * RETURN:      Status
 171  *
 172  * DESCRIPTION: "Store" an object to another object.  This may include
 173  *              converting the source type to the target type (implicit
 174  *              conversion), and a copy of the value of the source to
 175  *              the target.
 176  *
 177  *              The Assignment of an object to another (not named) object
 178  *              is handled here.
 179  *              The Source passed in will replace the current value (if any)
 180  *              with the input value.
 181  *
 182  *              When storing into an object the data is converted to the
 183  *              target object type then stored in the object.  This means
 184  *              that the target object type (for an initialized target) will
 185  *              not be changed by a store operation.
 186  *
 187  *              This module allows destination types of Number, String,
 188  *              Buffer, and Package.
 189  *
 190  *              Assumes parameters are already validated.  NOTE: source_desc
 191  *              resolution (from a reference object) must be performed by
 192  *              the caller if necessary.
 193  *
 194  ******************************************************************************/
 195
 196 acpi_status
 197 acpi_ex_store_object_to_object (
 198         union acpi_operand_object       *source_desc,
 199         union acpi_operand_object       *dest_desc,
 200         union acpi_operand_object       **new_desc,
 201         struct acpi_walk_state          *walk_state)
 202 {
 203         union acpi_operand_object       *actual_src_desc;
 204         acpi_status                     status = AE_OK;
 205
 206
 207         ACPI_FUNCTION_TRACE_PTR ("ex_store_object_to_object", source_desc);
 208
 209
 210         actual_src_desc = source_desc;
 211         if (!dest_desc) {
 212                 /*
 213                  * There is no destination object (An uninitialized node or
 214                  * package element), so we can simply copy the source object
 215                  * creating a new destination object
 216                  */
 217                 status = acpi_ut_copy_iobject_to_iobject (actual_src_desc, new_desc, walk_state);
 218                 return_ACPI_STATUS (status);
 219         }
 220
 221         if (ACPI_GET_OBJECT_TYPE (source_desc) != ACPI_GET_OBJECT_TYPE (dest_desc)) {
 222                 /*
 223                  * The source type does not match the type of the destination.
 224                  * Perform the "implicit conversion" of the source to the current type
 225                  * of the target as per the ACPI specification.
 226                  *
 227                  * If no conversion performed, actual_src_desc = source_desc.
 228                  * Otherwise, actual_src_desc is a temporary object to hold the
 229                  * converted object.
 230                  */
 231                 status = acpi_ex_convert_to_target_type (ACPI_GET_OBJECT_TYPE (dest_desc),
 232                                   source_desc, &actual_src_desc, 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 = acpi_ex_store_string_to_string (actual_src_desc, dest_desc);
 264                 break;
 265
 266         case ACPI_TYPE_BUFFER:
 267
 268                 /*
 269                  * Note: There is different store behavior depending on the original
 270                  * source type
 271                  */
 272                 status = acpi_ex_store_buffer_to_buffer (actual_src_desc, dest_desc);
 273                 break;
 274
 275         case ACPI_TYPE_PACKAGE:
 276
 277                 status = acpi_ut_copy_iobject_to_iobject (actual_src_desc, &dest_desc,
 278                                  walk_state);
 279                 break;
 280
 281         default:
 282                 /*
 283                  * All other types come here.
 284                  */
 285                 ACPI_DEBUG_PRINT ((ACPI_DB_WARN, "Store into type %s not implemented\n",
 286                         acpi_ut_get_object_type_name (dest_desc)));
 287
 288                 status = AE_NOT_IMPLEMENTED;
 289                 break;
 290         }
 291
 292         if (actual_src_desc != source_desc) {
 293                 /* Delete the intermediate (temporary) source object */
 294
 295                 acpi_ut_remove_reference (actual_src_desc);
 296         }
 297
 298         *new_desc = dest_desc;
 299         return_ACPI_STATUS (status);
 300 }
 301
 302