drivers/acpi/acpica/exstore.c

   1 /******************************************************************************
   2  *
   3  * Module Name: exstore - AML Interpreter object store support
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2013, 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 static acpi_status
  61 acpi_ex_store_direct_to_node(union acpi_operand_object *source_desc,
  62                              struct acpi_namespace_node *node,
  63                              struct acpi_walk_state *walk_state);
  64
  65 /*******************************************************************************
  66  *
  67  * FUNCTION:    acpi_ex_store
  68  *
  69  * PARAMETERS:  *source_desc        - Value to be stored
  70  *              *dest_desc          - Where to store it. Must be an NS node
  71  *                                    or union acpi_operand_object of type
  72  *                                    Reference;
  73  *              walk_state          - Current walk state
  74  *
  75  * RETURN:      Status
  76  *
  77  * DESCRIPTION: Store the value described by source_desc into the location
  78  *              described by dest_desc. Called by various interpreter
  79  *              functions to store the result of an operation into
  80  *              the destination operand -- not just simply the actual "Store"
  81  *              ASL operator.
  82  *
  83  ******************************************************************************/
  84
  85 acpi_status
  86 acpi_ex_store(union acpi_operand_object *source_desc,
  87               union acpi_operand_object *dest_desc,
  88               struct acpi_walk_state *walk_state)
  89 {
  90         acpi_status status = AE_OK;
  91         union acpi_operand_object *ref_desc = dest_desc;
  92
  93         ACPI_FUNCTION_TRACE_PTR(ex_store, dest_desc);
  94
  95         /* Validate parameters */
  96
  97         if (!source_desc || !dest_desc) {
  98                 ACPI_ERROR((AE_INFO, "Null parameter"));
  99                 return_ACPI_STATUS(AE_AML_NO_OPERAND);
 100         }
 101
 102         /* dest_desc can be either a namespace node or an ACPI object */
 103
 104         if (ACPI_GET_DESCRIPTOR_TYPE(dest_desc) == ACPI_DESC_TYPE_NAMED) {
 105                 /*
 106                  * Dest is a namespace node,
 107                  * Storing an object into a Named node.
 108                  */
 109                 status = acpi_ex_store_object_to_node(source_desc,
 110                                                       (struct
 111                                                        acpi_namespace_node *)
 112                                                       dest_desc, walk_state,
 113                                                       ACPI_IMPLICIT_CONVERSION);
 114
 115                 return_ACPI_STATUS(status);
 116         }
 117
 118         /* Destination object must be a Reference or a Constant object */
 119
 120         switch (dest_desc->common.type) {
 121         case ACPI_TYPE_LOCAL_REFERENCE:
 122
 123                 break;
 124
 125         case ACPI_TYPE_INTEGER:
 126
 127                 /* Allow stores to Constants -- a Noop as per ACPI spec */
 128
 129                 if (dest_desc->common.flags & AOPOBJ_AML_CONSTANT) {
 130                         return_ACPI_STATUS(AE_OK);
 131                 }
 132
 133                 /*lint -fallthrough */
 134
 135         default:
 136
 137                 /* Destination is not a Reference object */
 138
 139                 ACPI_ERROR((AE_INFO,
 140                             "Target is not a Reference or Constant object - %s [%p]",
 141                             acpi_ut_get_object_type_name(dest_desc),
 142                             dest_desc));
 143
 144                 return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 145         }
 146
 147         /*
 148          * Examine the Reference class. These cases are handled:
 149          *
 150          * 1) Store to Name (Change the object associated with a name)
 151          * 2) Store to an indexed area of a Buffer or Package
 152          * 3) Store to a Method Local or Arg
 153          * 4) Store to the debug object
 154          */
 155         switch (ref_desc->reference.class) {
 156         case ACPI_REFCLASS_REFOF:
 157
 158                 /* Storing an object into a Name "container" */
 159
 160                 status = acpi_ex_store_object_to_node(source_desc,
 161                                                       ref_desc->reference.
 162                                                       object, walk_state,
 163                                                       ACPI_IMPLICIT_CONVERSION);
 164                 break;
 165
 166         case ACPI_REFCLASS_INDEX:
 167
 168                 /* Storing to an Index (pointer into a packager or buffer) */
 169
 170                 status =
 171                     acpi_ex_store_object_to_index(source_desc, ref_desc,
 172                                                   walk_state);
 173                 break;
 174
 175         case ACPI_REFCLASS_LOCAL:
 176         case ACPI_REFCLASS_ARG:
 177
 178                 /* Store to a method local/arg  */
 179
 180                 status =
 181                     acpi_ds_store_object_to_local(ref_desc->reference.class,
 182                                                   ref_desc->reference.value,
 183                                                   source_desc, walk_state);
 184                 break;
 185
 186         case ACPI_REFCLASS_DEBUG:
 187                 /*
 188                  * Storing to the Debug object causes the value stored to be
 189                  * displayed and otherwise has no effect -- see ACPI Specification
 190                  */
 191                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 192                                   "**** Write to Debug Object: Object %p %s ****:\n\n",
 193                                   source_desc,
 194                                   acpi_ut_get_object_type_name(source_desc)));
 195
 196                 ACPI_DEBUG_OBJECT(source_desc, 0, 0);
 197                 break;
 198
 199         default:
 200
 201                 ACPI_ERROR((AE_INFO, "Unknown Reference Class 0x%2.2X",
 202                             ref_desc->reference.class));
 203                 ACPI_DUMP_ENTRY(ref_desc, ACPI_LV_INFO);
 204
 205                 status = AE_AML_INTERNAL;
 206                 break;
 207         }
 208
 209         return_ACPI_STATUS(status);
 210 }
 211
 212 /*******************************************************************************
 213  *
 214  * FUNCTION:    acpi_ex_store_object_to_index
 215  *
 216  * PARAMETERS:  *source_desc            - Value to be stored
 217  *              *dest_desc              - Named object to receive the value
 218  *              walk_state              - Current walk state
 219  *
 220  * RETURN:      Status
 221  *
 222  * DESCRIPTION: Store the object to indexed Buffer or Package element
 223  *
 224  ******************************************************************************/
 225
 226 static acpi_status
 227 acpi_ex_store_object_to_index(union acpi_operand_object *source_desc,
 228                               union acpi_operand_object *index_desc,
 229                               struct acpi_walk_state *walk_state)
 230 {
 231         acpi_status status = AE_OK;
 232         union acpi_operand_object *obj_desc;
 233         union acpi_operand_object *new_desc;
 234         u8 value = 0;
 235         u32 i;
 236
 237         ACPI_FUNCTION_TRACE(ex_store_object_to_index);
 238
 239         /*
 240          * Destination must be a reference pointer, and
 241          * must point to either a buffer or a package
 242          */
 243         switch (index_desc->reference.target_type) {
 244         case ACPI_TYPE_PACKAGE:
 245                 /*
 246                  * Storing to a package element. Copy the object and replace
 247                  * any existing object with the new object. No implicit
 248                  * conversion is performed.
 249                  *
 250                  * The object at *(index_desc->Reference.Where) is the
 251                  * element within the package that is to be modified.
 252                  * The parent package object is at index_desc->Reference.Object
 253                  */
 254                 obj_desc = *(index_desc->reference.where);
 255
 256                 if (source_desc->common.type == ACPI_TYPE_LOCAL_REFERENCE &&
 257                     source_desc->reference.class == ACPI_REFCLASS_TABLE) {
 258
 259                         /* This is a DDBHandle, just add a reference to it */
 260
 261                         acpi_ut_add_reference(source_desc);
 262                         new_desc = source_desc;
 263                 } else {
 264                         /* Normal object, copy it */
 265
 266                         status =
 267                             acpi_ut_copy_iobject_to_iobject(source_desc,
 268                                                             &new_desc,
 269                                                             walk_state);
 270                         if (ACPI_FAILURE(status)) {
 271                                 return_ACPI_STATUS(status);
 272                         }
 273                 }
 274
 275                 if (obj_desc) {
 276
 277                         /* Decrement reference count by the ref count of the parent package */
 278
 279                         for (i = 0; i < ((union acpi_operand_object *)
 280                                          index_desc->reference.object)->common.
 281                              reference_count; i++) {
 282                                 acpi_ut_remove_reference(obj_desc);
 283                         }
 284                 }
 285
 286                 *(index_desc->reference.where) = new_desc;
 287
 288                 /* Increment ref count by the ref count of the parent package-1 */
 289
 290                 for (i = 1; i < ((union acpi_operand_object *)
 291                                  index_desc->reference.object)->common.
 292                      reference_count; i++) {
 293                         acpi_ut_add_reference(new_desc);
 294                 }
 295
 296                 break;
 297
 298         case ACPI_TYPE_BUFFER_FIELD:
 299                 /*
 300                  * Store into a Buffer or String (not actually a real buffer_field)
 301                  * at a location defined by an Index.
 302                  *
 303                  * The first 8-bit element of the source object is written to the
 304                  * 8-bit Buffer location defined by the Index destination object,
 305                  * according to the ACPI 2.0 specification.
 306                  */
 307
 308                 /*
 309                  * Make sure the target is a Buffer or String. An error should
 310                  * not happen here, since the reference_object was constructed
 311                  * by the INDEX_OP code.
 312                  */
 313                 obj_desc = index_desc->reference.object;
 314                 if ((obj_desc->common.type != ACPI_TYPE_BUFFER) &&
 315                     (obj_desc->common.type != ACPI_TYPE_STRING)) {
 316                         return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 317                 }
 318
 319                 /*
 320                  * The assignment of the individual elements will be slightly
 321                  * different for each source type.
 322                  */
 323                 switch (source_desc->common.type) {
 324                 case ACPI_TYPE_INTEGER:
 325
 326                         /* Use the least-significant byte of the integer */
 327
 328                         value = (u8) (source_desc->integer.value);
 329                         break;
 330
 331                 case ACPI_TYPE_BUFFER:
 332                 case ACPI_TYPE_STRING:
 333
 334                         /* Note: Takes advantage of common string/buffer fields */
 335
 336                         value = source_desc->buffer.pointer[0];
 337                         break;
 338
 339                 default:
 340
 341                         /* All other types are invalid */
 342
 343                         ACPI_ERROR((AE_INFO,
 344                                     "Source must be Integer/Buffer/String type, not %s",
 345                                     acpi_ut_get_object_type_name(source_desc)));
 346                         return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 347                 }
 348
 349                 /* Store the source value into the target buffer byte */
 350
 351                 obj_desc->buffer.pointer[index_desc->reference.value] = value;
 352                 break;
 353
 354         default:
 355                 ACPI_ERROR((AE_INFO, "Target is not a Package or BufferField"));
 356                 status = AE_AML_OPERAND_TYPE;
 357                 break;
 358         }
 359
 360         return_ACPI_STATUS(status);
 361 }
 362
 363 /*******************************************************************************
 364  *
 365  * FUNCTION:    acpi_ex_store_object_to_node
 366  *
 367  * PARAMETERS:  source_desc             - Value to be stored
 368  *              node                    - Named object to receive the value
 369  *              walk_state              - Current walk state
 370  *              implicit_conversion     - Perform implicit conversion (yes/no)
 371  *
 372  * RETURN:      Status
 373  *
 374  * DESCRIPTION: Store the object to the named object.
 375  *
 376  *              The Assignment of an object to a named object is handled here
 377  *              The value passed in will replace the current value (if any)
 378  *              with the input value.
 379  *
 380  *              When storing into an object the data is converted to the
 381  *              target object type then stored in the object. This means
 382  *              that the target object type (for an initialized target) will
 383  *              not be changed by a store operation. A copy_object can change
 384  *              the target type, however.
 385  *
 386  *              The implicit_conversion flag is set to NO/FALSE only when
 387  *              storing to an arg_x -- as per the rules of the ACPI spec.
 388  *
 389  *              Assumes parameters are already validated.
 390  *
 391  ******************************************************************************/
 392
 393 acpi_status
 394 acpi_ex_store_object_to_node(union acpi_operand_object *source_desc,
 395                              struct acpi_namespace_node *node,
 396                              struct acpi_walk_state *walk_state,
 397                              u8 implicit_conversion)
 398 {
 399         acpi_status status = AE_OK;
 400         union acpi_operand_object *target_desc;
 401         union acpi_operand_object *new_desc;
 402         acpi_object_type target_type;
 403
 404         ACPI_FUNCTION_TRACE_PTR(ex_store_object_to_node, source_desc);
 405
 406         /* Get current type of the node, and object attached to Node */
 407
 408         target_type = acpi_ns_get_type(node);
 409         target_desc = acpi_ns_get_attached_object(node);
 410
 411         ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Storing %p (%s) to node %p (%s)\n",
 412                           source_desc,
 413                           acpi_ut_get_object_type_name(source_desc), node,
 414                           acpi_ut_get_type_name(target_type)));
 415
 416         /*
 417          * Resolve the source object to an actual value
 418          * (If it is a reference object)
 419          */
 420         status = acpi_ex_resolve_object(&source_desc, target_type, walk_state);
 421         if (ACPI_FAILURE(status)) {
 422                 return_ACPI_STATUS(status);
 423         }
 424
 425         /* Do the actual store operation */
 426
 427         switch (target_type) {
 428         case ACPI_TYPE_INTEGER:
 429         case ACPI_TYPE_STRING:
 430         case ACPI_TYPE_BUFFER:
 431                 /*
 432                  * The simple data types all support implicit source operand
 433                  * conversion before the store.
 434                  */
 435
 436                 if ((walk_state->opcode == AML_COPY_OP) || !implicit_conversion) {
 437                         /*
 438                          * However, copy_object and Stores to arg_x do not perform
 439                          * an implicit conversion, as per the ACPI specification.
 440                          * A direct store is performed instead.
 441                          */
 442                         status = acpi_ex_store_direct_to_node(source_desc, node,
 443                                                               walk_state);
 444                         break;
 445                 }
 446
 447                 /* Store with implicit source operand conversion support */
 448
 449                 status =
 450                     acpi_ex_store_object_to_object(source_desc, target_desc,
 451                                                    &new_desc, walk_state);
 452                 if (ACPI_FAILURE(status)) {
 453                         return_ACPI_STATUS(status);
 454                 }
 455
 456                 if (new_desc != target_desc) {
 457                         /*
 458                          * Store the new new_desc as the new value of the Name, and set
 459                          * the Name's type to that of the value being stored in it.
 460                          * source_desc reference count is incremented by attach_object.
 461                          *
 462                          * Note: This may change the type of the node if an explicit
 463                          * store has been performed such that the node/object type
 464                          * has been changed.
 465                          */
 466                         status = acpi_ns_attach_object(node, new_desc,
 467                                                        new_desc->common.type);
 468
 469                         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 470                                           "Store %s into %s via Convert/Attach\n",
 471                                           acpi_ut_get_object_type_name
 472                                           (source_desc),
 473                                           acpi_ut_get_object_type_name
 474                                           (new_desc)));
 475                 }
 476                 break;
 477
 478         case ACPI_TYPE_BUFFER_FIELD:
 479         case ACPI_TYPE_LOCAL_REGION_FIELD:
 480         case ACPI_TYPE_LOCAL_BANK_FIELD:
 481         case ACPI_TYPE_LOCAL_INDEX_FIELD:
 482                 /*
 483                  * For all fields, always write the source data to the target
 484                  * field. Any required implicit source operand conversion is
 485                  * performed in the function below as necessary. Note, field
 486                  * objects must retain their original type permanently.
 487                  */
 488                 status = acpi_ex_write_data_to_field(source_desc, target_desc,
 489                                                      &walk_state->result_obj);
 490                 break;
 491
 492         default:
 493                 /*
 494                  * No conversions for all other types. Directly store a copy of
 495                  * the source object. This is the ACPI spec-defined behavior for
 496                  * the copy_object operator.
 497                  *
 498                  * NOTE: For the Store operator, this is a departure from the
 499                  * ACPI spec, which states "If conversion is impossible, abort
 500                  * the running control method". Instead, this code implements
 501                  * "If conversion is impossible, treat the Store operation as
 502                  * a CopyObject".
 503                  */
 504                 status = acpi_ex_store_direct_to_node(source_desc, node,
 505                                                       walk_state);
 506                 break;
 507         }
 508
 509         return_ACPI_STATUS(status);
 510 }
 511
 512 /*******************************************************************************
 513  *
 514  * FUNCTION:    acpi_ex_store_direct_to_node
 515  *
 516  * PARAMETERS:  source_desc             - Value to be stored
 517  *              node                    - Named object to receive the value
 518  *              walk_state              - Current walk state
 519  *
 520  * RETURN:      Status
 521  *
 522  * DESCRIPTION: "Store" an object directly to a node. This involves a copy
 523  *              and an attach.
 524  *
 525  ******************************************************************************/
 526
 527 static acpi_status
 528 acpi_ex_store_direct_to_node(union acpi_operand_object *source_desc,
 529                              struct acpi_namespace_node *node,
 530                              struct acpi_walk_state *walk_state)
 531 {
 532         acpi_status status;
 533         union acpi_operand_object *new_desc;
 534
 535         ACPI_FUNCTION_TRACE(ex_store_direct_to_node);
 536
 537         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 538                           "Storing [%s] (%p) directly into node [%s] (%p)"
 539                           " with no implicit conversion\n",
 540                           acpi_ut_get_object_type_name(source_desc),
 541                           source_desc, acpi_ut_get_type_name(node->type),
 542                           node));
 543
 544         /* Copy the source object to a new object */
 545
 546         status =
 547             acpi_ut_copy_iobject_to_iobject(source_desc, &new_desc, walk_state);
 548         if (ACPI_FAILURE(status)) {
 549                 return_ACPI_STATUS(status);
 550         }
 551
 552         /* Attach the new object to the node */
 553
 554         status = acpi_ns_attach_object(node, new_desc, new_desc->common.type);
 555         acpi_ut_remove_reference(new_desc);
 556         return_ACPI_STATUS(status);
 557 }