release/src-rt-6.x.4708/linux/linux-2.6.36/drivers/acpi/acpica/exstore.c

   1 /******************************************************************************
   2  *
   3  * Module Name: exstore - AML Interpreter object store support
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2010, 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/acpi.h>
  45 #include "accommon.h"
  46 #include "acdispat.h"
  47 #include "acinterp.h"
  48 #include "amlcode.h"
  49 #include "acnamesp.h"
  50
  51 #define _COMPONENT          ACPI_EXECUTER
  52 ACPI_MODULE_NAME("exstore")
  53
  54 /* Local prototypes */
  55 static acpi_status
  56 acpi_ex_store_object_to_index(union acpi_operand_object *val_desc,
  57                               union acpi_operand_object *dest_desc,
  58                               struct acpi_walk_state *walk_state);
  59
  60 /*******************************************************************************
  61  *
  62  * FUNCTION:    acpi_ex_store
  63  *
  64  * PARAMETERS:  *source_desc        - Value to be stored
  65  *              *dest_desc          - Where to store it.  Must be an NS node
  66  *                                    or a union acpi_operand_object of type
  67  *                                    Reference;
  68  *              walk_state          - Current walk state
  69  *
  70  * RETURN:      Status
  71  *
  72  * DESCRIPTION: Store the value described by source_desc into the location
  73  *              described by dest_desc. Called by various interpreter
  74  *              functions to store the result of an operation into
  75  *              the destination operand -- not just simply the actual "Store"
  76  *              ASL operator.
  77  *
  78  ******************************************************************************/
  79
  80 acpi_status
  81 acpi_ex_store(union acpi_operand_object *source_desc,
  82               union acpi_operand_object *dest_desc,
  83               struct acpi_walk_state *walk_state)
  84 {
  85         acpi_status status = AE_OK;
  86         union acpi_operand_object *ref_desc = dest_desc;
  87
  88         ACPI_FUNCTION_TRACE_PTR(ex_store, dest_desc);
  89
  90         /* Validate parameters */
  91
  92         if (!source_desc || !dest_desc) {
  93                 ACPI_ERROR((AE_INFO, "Null parameter"));
  94                 return_ACPI_STATUS(AE_AML_NO_OPERAND);
  95         }
  96
  97         /* dest_desc can be either a namespace node or an ACPI object */
  98
  99         if (ACPI_GET_DESCRIPTOR_TYPE(dest_desc) == ACPI_DESC_TYPE_NAMED) {
 100                 /*
 101                  * Dest is a namespace node,
 102                  * Storing an object into a Named node.
 103                  */
 104                 status = acpi_ex_store_object_to_node(source_desc,
 105                                                       (struct
 106                                                        acpi_namespace_node *)
 107                                                       dest_desc, walk_state,
 108                                                       ACPI_IMPLICIT_CONVERSION);
 109
 110                 return_ACPI_STATUS(status);
 111         }
 112
 113         /* Destination object must be a Reference or a Constant object */
 114
 115         switch (dest_desc->common.type) {
 116         case ACPI_TYPE_LOCAL_REFERENCE:
 117                 break;
 118
 119         case ACPI_TYPE_INTEGER:
 120
 121                 /* Allow stores to Constants -- a Noop as per ACPI spec */
 122
 123                 if (dest_desc->common.flags & AOPOBJ_AML_CONSTANT) {
 124                         return_ACPI_STATUS(AE_OK);
 125                 }
 126
 127                 /*lint -fallthrough */
 128
 129         default:
 130
 131                 /* Destination is not a Reference object */
 132
 133                 ACPI_ERROR((AE_INFO,
 134                             "Target is not a Reference or Constant object - %s [%p]",
 135                             acpi_ut_get_object_type_name(dest_desc),
 136                             dest_desc));
 137
 138                 return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 139         }
 140
 141         /*
 142          * Examine the Reference class. These cases are handled:
 143          *
 144          * 1) Store to Name (Change the object associated with a name)
 145          * 2) Store to an indexed area of a Buffer or Package
 146          * 3) Store to a Method Local or Arg
 147          * 4) Store to the debug object
 148          */
 149         switch (ref_desc->reference.class) {
 150         case ACPI_REFCLASS_REFOF:
 151
 152                 /* Storing an object into a Name "container" */
 153
 154                 status = acpi_ex_store_object_to_node(source_desc,
 155                                                       ref_desc->reference.
 156                                                       object, walk_state,
 157                                                       ACPI_IMPLICIT_CONVERSION);
 158                 break;
 159
 160         case ACPI_REFCLASS_INDEX:
 161
 162                 /* Storing to an Index (pointer into a packager or buffer) */
 163
 164                 status =
 165                     acpi_ex_store_object_to_index(source_desc, ref_desc,
 166                                                   walk_state);
 167                 break;
 168
 169         case ACPI_REFCLASS_LOCAL:
 170         case ACPI_REFCLASS_ARG:
 171
 172                 /* Store to a method local/arg  */
 173
 174                 status =
 175                     acpi_ds_store_object_to_local(ref_desc->reference.class,
 176                                                   ref_desc->reference.value,
 177                                                   source_desc, walk_state);
 178                 break;
 179
 180         case ACPI_REFCLASS_DEBUG:
 181
 182                 /*
 183                  * Storing to the Debug object causes the value stored to be
 184                  * displayed and otherwise has no effect -- see ACPI Specification
 185                  */
 186                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 187                                   "**** Write to Debug Object: Object %p %s ****:\n\n",
 188                                   source_desc,
 189                                   acpi_ut_get_object_type_name(source_desc)));
 190
 191                 ACPI_DEBUG_OBJECT(source_desc, 0, 0);
 192                 break;
 193
 194         default:
 195
 196                 ACPI_ERROR((AE_INFO, "Unknown Reference Class 0x%2.2X",
 197                             ref_desc->reference.class));
 198                 ACPI_DUMP_ENTRY(ref_desc, ACPI_LV_INFO);
 199
 200                 status = AE_AML_INTERNAL;
 201                 break;
 202         }
 203
 204         return_ACPI_STATUS(status);
 205 }
 206
 207 /*******************************************************************************
 208  *
 209  * FUNCTION:    acpi_ex_store_object_to_index
 210  *
 211  * PARAMETERS:  *source_desc            - Value to be stored
 212  *              *dest_desc              - Named object to receive the value
 213  *              walk_state              - Current walk state
 214  *
 215  * RETURN:      Status
 216  *
 217  * DESCRIPTION: Store the object to indexed Buffer or Package element
 218  *
 219  ******************************************************************************/
 220
 221 static acpi_status
 222 acpi_ex_store_object_to_index(union acpi_operand_object *source_desc,
 223                               union acpi_operand_object *index_desc,
 224                               struct acpi_walk_state *walk_state)
 225 {
 226         acpi_status status = AE_OK;
 227         union acpi_operand_object *obj_desc;
 228         union acpi_operand_object *new_desc;
 229         u8 value = 0;
 230         u32 i;
 231
 232         ACPI_FUNCTION_TRACE(ex_store_object_to_index);
 233
 234         /*
 235          * Destination must be a reference pointer, and
 236          * must point to either a buffer or a package
 237          */
 238         switch (index_desc->reference.target_type) {
 239         case ACPI_TYPE_PACKAGE:
 240                 /*
 241                  * Storing to a package element. Copy the object and replace
 242                  * any existing object with the new object. No implicit
 243                  * conversion is performed.
 244                  *
 245                  * The object at *(index_desc->Reference.Where) is the
 246                  * element within the package that is to be modified.
 247                  * The parent package object is at index_desc->Reference.Object
 248                  */
 249                 obj_desc = *(index_desc->reference.where);
 250
 251                 if (source_desc->common.type == ACPI_TYPE_LOCAL_REFERENCE &&
 252                     source_desc->reference.class == ACPI_REFCLASS_TABLE) {
 253
 254                         /* This is a DDBHandle, just add a reference to it */
 255
 256                         acpi_ut_add_reference(source_desc);
 257                         new_desc = source_desc;
 258                 } else {
 259                         /* Normal object, copy it */
 260
 261                         status =
 262                             acpi_ut_copy_iobject_to_iobject(source_desc,
 263                                                             &new_desc,
 264                                                             walk_state);
 265                         if (ACPI_FAILURE(status)) {
 266                                 return_ACPI_STATUS(status);
 267                         }
 268                 }
 269
 270                 if (obj_desc) {
 271
 272                         /* Decrement reference count by the ref count of the parent package */
 273
 274                         for (i = 0; i < ((union acpi_operand_object *)
 275                                          index_desc->reference.object)->common.
 276                              reference_count; i++) {
 277                                 acpi_ut_remove_reference(obj_desc);
 278                         }
 279                 }
 280
 281                 *(index_desc->reference.where) = new_desc;
 282
 283                 /* Increment ref count by the ref count of the parent package-1 */
 284
 285                 for (i = 1; i < ((union acpi_operand_object *)
 286                                  index_desc->reference.object)->common.
 287                      reference_count; i++) {
 288                         acpi_ut_add_reference(new_desc);
 289                 }
 290
 291                 break;
 292
 293         case ACPI_TYPE_BUFFER_FIELD:
 294
 295                 /*
 296                  * Store into a Buffer or String (not actually a real buffer_field)
 297                  * at a location defined by an Index.
 298                  *
 299                  * The first 8-bit element of the source object is written to the
 300                  * 8-bit Buffer location defined by the Index destination object,
 301                  * according to the ACPI 2.0 specification.
 302                  */
 303
 304                 /*
 305                  * Make sure the target is a Buffer or String. An error should
 306                  * not happen here, since the reference_object was constructed
 307                  * by the INDEX_OP code.
 308                  */
 309                 obj_desc = index_desc->reference.object;
 310                 if ((obj_desc->common.type != ACPI_TYPE_BUFFER) &&
 311                     (obj_desc->common.type != ACPI_TYPE_STRING)) {
 312                         return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 313                 }
 314
 315                 /*
 316                  * The assignment of the individual elements will be slightly
 317                  * different for each source type.
 318                  */
 319                 switch (source_desc->common.type) {
 320                 case ACPI_TYPE_INTEGER:
 321
 322                         /* Use the least-significant byte of the integer */
 323
 324                         value = (u8) (source_desc->integer.value);
 325                         break;
 326
 327                 case ACPI_TYPE_BUFFER:
 328                 case ACPI_TYPE_STRING:
 329
 330                         /* Note: Takes advantage of common string/buffer fields */
 331
 332                         value = source_desc->buffer.pointer[0];
 333                         break;
 334
 335                 default:
 336
 337                         /* All other types are invalid */
 338
 339                         ACPI_ERROR((AE_INFO,
 340                                     "Source must be Integer/Buffer/String type, not %s",
 341                                     acpi_ut_get_object_type_name(source_desc)));
 342                         return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 343                 }
 344
 345                 /* Store the source value into the target buffer byte */
 346
 347                 obj_desc->buffer.pointer[index_desc->reference.value] = value;
 348                 break;
 349
 350         default:
 351                 ACPI_ERROR((AE_INFO, "Target is not a Package or BufferField"));
 352                 status = AE_AML_OPERAND_TYPE;
 353                 break;
 354         }
 355
 356         return_ACPI_STATUS(status);
 357 }
 358
 359 /*******************************************************************************
 360  *
 361  * FUNCTION:    acpi_ex_store_object_to_node
 362  *
 363  * PARAMETERS:  source_desc             - Value to be stored
 364  *              Node                    - Named object to receive the value
 365  *              walk_state              - Current walk state
 366  *              implicit_conversion     - Perform implicit conversion (yes/no)
 367  *
 368  * RETURN:      Status
 369  *
 370  * DESCRIPTION: Store the object to the named object.
 371  *
 372  *              The Assignment of an object to a named object is handled here
 373  *              The value passed in will replace the current value (if any)
 374  *              with the input value.
 375  *
 376  *              When storing into an object the data is converted to the
 377  *              target object type then stored in the object.  This means
 378  *              that the target object type (for an initialized target) will
 379  *              not be changed by a store operation.
 380  *
 381  *              Assumes parameters are already validated.
 382  *
 383  ******************************************************************************/
 384
 385 acpi_status
 386 acpi_ex_store_object_to_node(union acpi_operand_object *source_desc,
 387                              struct acpi_namespace_node *node,
 388                              struct acpi_walk_state *walk_state,
 389                              u8 implicit_conversion)
 390 {
 391         acpi_status status = AE_OK;
 392         union acpi_operand_object *target_desc;
 393         union acpi_operand_object *new_desc;
 394         acpi_object_type target_type;
 395
 396         ACPI_FUNCTION_TRACE_PTR(ex_store_object_to_node, source_desc);
 397
 398         /* Get current type of the node, and object attached to Node */
 399
 400         target_type = acpi_ns_get_type(node);
 401         target_desc = acpi_ns_get_attached_object(node);
 402
 403         ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Storing %p(%s) into node %p(%s)\n",
 404                           source_desc,
 405                           acpi_ut_get_object_type_name(source_desc), node,
 406                           acpi_ut_get_type_name(target_type)));
 407
 408         /*
 409          * Resolve the source object to an actual value
 410          * (If it is a reference object)
 411          */
 412         status = acpi_ex_resolve_object(&source_desc, target_type, walk_state);
 413         if (ACPI_FAILURE(status)) {
 414                 return_ACPI_STATUS(status);
 415         }
 416
 417         /* If no implicit conversion, drop into the default case below */
 418
 419         if ((!implicit_conversion) ||
 420             ((walk_state->opcode == AML_COPY_OP) &&
 421              (target_type != ACPI_TYPE_LOCAL_REGION_FIELD) &&
 422              (target_type != ACPI_TYPE_LOCAL_BANK_FIELD) &&
 423              (target_type != ACPI_TYPE_LOCAL_INDEX_FIELD))) {
 424                 /*
 425                  * Force execution of default (no implicit conversion). Note:
 426                  * copy_object does not perform an implicit conversion, as per the ACPI
 427                  * spec -- except in case of region/bank/index fields -- because these
 428                  * objects must retain their original type permanently.
 429                  */
 430                 target_type = ACPI_TYPE_ANY;
 431         }
 432
 433         /* Do the actual store operation */
 434
 435         switch (target_type) {
 436         case ACPI_TYPE_BUFFER_FIELD:
 437         case ACPI_TYPE_LOCAL_REGION_FIELD:
 438         case ACPI_TYPE_LOCAL_BANK_FIELD:
 439         case ACPI_TYPE_LOCAL_INDEX_FIELD:
 440
 441                 /* For fields, copy the source data to the target field. */
 442
 443                 status = acpi_ex_write_data_to_field(source_desc, target_desc,
 444                                                      &walk_state->result_obj);
 445                 break;
 446
 447         case ACPI_TYPE_INTEGER:
 448         case ACPI_TYPE_STRING:
 449         case ACPI_TYPE_BUFFER:
 450
 451                 /*
 452                  * These target types are all of type Integer/String/Buffer, and
 453                  * therefore support implicit conversion before the store.
 454                  *
 455                  * Copy and/or convert the source object to a new target object
 456                  */
 457                 status =
 458                     acpi_ex_store_object_to_object(source_desc, target_desc,
 459                                                    &new_desc, walk_state);
 460                 if (ACPI_FAILURE(status)) {
 461                         return_ACPI_STATUS(status);
 462                 }
 463
 464                 if (new_desc != target_desc) {
 465                         /*
 466                          * Store the new new_desc as the new value of the Name, and set
 467                          * the Name's type to that of the value being stored in it.
 468                          * source_desc reference count is incremented by attach_object.
 469                          *
 470                          * Note: This may change the type of the node if an explicit store
 471                          * has been performed such that the node/object type has been
 472                          * changed.
 473                          */
 474                         status =
 475                             acpi_ns_attach_object(node, new_desc,
 476                                                   new_desc->common.type);
 477
 478                         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 479                                           "Store %s into %s via Convert/Attach\n",
 480                                           acpi_ut_get_object_type_name
 481                                           (source_desc),
 482                                           acpi_ut_get_object_type_name
 483                                           (new_desc)));
 484                 }
 485                 break;
 486
 487         default:
 488
 489                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 490                                   "Storing %s (%p) directly into node (%p) with no implicit conversion\n",
 491                                   acpi_ut_get_object_type_name(source_desc),
 492                                   source_desc, node));
 493
 494                 /* No conversions for all other types.  Just attach the source object */
 495
 496                 status = acpi_ns_attach_object(node, source_desc,
 497                                                source_desc->common.type);
 498                 break;
 499         }
 500
 501         return_ACPI_STATUS(status);
 502 }