git.oblomov.eu Git - linux-2.6/blob - drivers/acpi/dispatcher/dsfield.c

   1 /******************************************************************************
   2  *
   3  * Module Name: dsfield - Dispatcher field routines
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2005, R. Byron Moore
   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 <acpi/amlcode.h>
  46 #include <acpi/acdispat.h>
  47 #include <acpi/acinterp.h>
  48 #include <acpi/acnamesp.h>
  49 #include <acpi/acparser.h>
  50
  51 #define _COMPONENT          ACPI_DISPATCHER
  52 ACPI_MODULE_NAME("dsfield")
  53
  54 /* Local prototypes */
  55 static acpi_status
  56 acpi_ds_get_field_names(struct acpi_create_field_info *info,
  57                         struct acpi_walk_state *walk_state,
  58                         union acpi_parse_object *arg);
  59
  60 /*******************************************************************************
  61  *
  62  * FUNCTION:    acpi_ds_create_buffer_field
  63  *
  64  * PARAMETERS:  Op                  - Current parse op (create_xXField)
  65  *              walk_state          - Current state
  66  *
  67  * RETURN:      Status
  68  *
  69  * DESCRIPTION: Execute the create_field operators:
  70  *              create_bit_field_op,
  71  *              create_byte_field_op,
  72  *              create_word_field_op,
  73  *              create_dword_field_op,
  74  *              create_qword_field_op,
  75  *              create_field_op     (all of which define a field in a buffer)
  76  *
  77  ******************************************************************************/
  78
  79 acpi_status
  80 acpi_ds_create_buffer_field(union acpi_parse_object *op,
  81                             struct acpi_walk_state *walk_state)
  82 {
  83         union acpi_parse_object *arg;
  84         struct acpi_namespace_node *node;
  85         acpi_status status;
  86         union acpi_operand_object *obj_desc;
  87         union acpi_operand_object *second_desc = NULL;
  88         u32 flags;
  89
  90         ACPI_FUNCTION_TRACE("ds_create_buffer_field");
  91
  92         /* Get the name_string argument */
  93
  94         if (op->common.aml_opcode == AML_CREATE_FIELD_OP) {
  95                 arg = acpi_ps_get_arg(op, 3);
  96         } else {
  97                 /* Create Bit/Byte/Word/Dword field */
  98
  99                 arg = acpi_ps_get_arg(op, 2);
 100         }
 101
 102         if (!arg) {
 103                 return_ACPI_STATUS(AE_AML_NO_OPERAND);
 104         }
 105
 106         if (walk_state->deferred_node) {
 107                 node = walk_state->deferred_node;
 108                 status = AE_OK;
 109         } else {
 110                 /*
 111                  * During the load phase, we want to enter the name of the field into
 112                  * the namespace.  During the execute phase (when we evaluate the size
 113                  * operand), we want to lookup the name
 114                  */
 115                 if (walk_state->parse_flags & ACPI_PARSE_EXECUTE) {
 116                         flags = ACPI_NS_NO_UPSEARCH | ACPI_NS_DONT_OPEN_SCOPE;
 117                 } else {
 118                         flags = ACPI_NS_NO_UPSEARCH | ACPI_NS_DONT_OPEN_SCOPE |
 119                             ACPI_NS_ERROR_IF_FOUND;
 120                 }
 121
 122                 /*
 123                  * Enter the name_string into the namespace
 124                  */
 125                 status =
 126                     acpi_ns_lookup(walk_state->scope_info,
 127                                    arg->common.value.string, ACPI_TYPE_ANY,
 128                                    ACPI_IMODE_LOAD_PASS1, flags, walk_state,
 129                                    &(node));
 130                 if (ACPI_FAILURE(status)) {
 131                         ACPI_REPORT_NSERROR(arg->common.value.string, status);
 132                         return_ACPI_STATUS(status);
 133                 }
 134         }
 135
 136         /* We could put the returned object (Node) on the object stack for later,
 137          * but for now, we will put it in the "op" object that the parser uses,
 138          * so we can get it again at the end of this scope
 139          */
 140         op->common.node = node;
 141
 142         /*
 143          * If there is no object attached to the node, this node was just created
 144          * and we need to create the field object.  Otherwise, this was a lookup
 145          * of an existing node and we don't want to create the field object again.
 146          */
 147         obj_desc = acpi_ns_get_attached_object(node);
 148         if (obj_desc) {
 149                 return_ACPI_STATUS(AE_OK);
 150         }
 151
 152         /*
 153          * The Field definition is not fully parsed at this time.
 154          * (We must save the address of the AML for the buffer and index operands)
 155          */
 156
 157         /* Create the buffer field object */
 158
 159         obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_BUFFER_FIELD);
 160         if (!obj_desc) {
 161                 status = AE_NO_MEMORY;
 162                 goto cleanup;
 163         }
 164
 165         /*
 166          * Remember location in AML stream of the field unit
 167          * opcode and operands -- since the buffer and index
 168          * operands must be evaluated.
 169          */
 170         second_desc = obj_desc->common.next_object;
 171         second_desc->extra.aml_start = op->named.data;
 172         second_desc->extra.aml_length = op->named.length;
 173         obj_desc->buffer_field.node = node;
 174
 175         /* Attach constructed field descriptors to parent node */
 176
 177         status = acpi_ns_attach_object(node, obj_desc, ACPI_TYPE_BUFFER_FIELD);
 178         if (ACPI_FAILURE(status)) {
 179                 goto cleanup;
 180         }
 181
 182       cleanup:
 183
 184         /* Remove local reference to the object */
 185
 186         acpi_ut_remove_reference(obj_desc);
 187         return_ACPI_STATUS(status);
 188 }
 189
 190 /*******************************************************************************
 191  *
 192  * FUNCTION:    acpi_ds_get_field_names
 193  *
 194  * PARAMETERS:  Info            - create_field info structure
 195  *  `           walk_state      - Current method state
 196  *              Arg             - First parser arg for the field name list
 197  *
 198  * RETURN:      Status
 199  *
 200  * DESCRIPTION: Process all named fields in a field declaration.  Names are
 201  *              entered into the namespace.
 202  *
 203  ******************************************************************************/
 204
 205 static acpi_status
 206 acpi_ds_get_field_names(struct acpi_create_field_info *info,
 207                         struct acpi_walk_state *walk_state,
 208                         union acpi_parse_object *arg)
 209 {
 210         acpi_status status;
 211         acpi_integer position;
 212
 213         ACPI_FUNCTION_TRACE_PTR("ds_get_field_names", info);
 214
 215         /* First field starts at bit zero */
 216
 217         info->field_bit_position = 0;
 218
 219         /* Process all elements in the field list (of parse nodes) */
 220
 221         while (arg) {
 222                 /*
 223                  * Three types of field elements are handled:
 224                  * 1) Offset - specifies a bit offset
 225                  * 2) access_as - changes the access mode
 226                  * 3) Name - Enters a new named field into the namespace
 227                  */
 228                 switch (arg->common.aml_opcode) {
 229                 case AML_INT_RESERVEDFIELD_OP:
 230
 231                         position = (acpi_integer) info->field_bit_position
 232                             + (acpi_integer) arg->common.value.size;
 233
 234                         if (position > ACPI_UINT32_MAX) {
 235                                 ACPI_REPORT_ERROR(("Bit offset within field too large (> 0xFFFFFFFF)\n"));
 236                                 return_ACPI_STATUS(AE_SUPPORT);
 237                         }
 238
 239                         info->field_bit_position = (u32) position;
 240                         break;
 241
 242                 case AML_INT_ACCESSFIELD_OP:
 243
 244                         /*
 245                          * Get a new access_type and access_attribute -- to be used for all
 246                          * field units that follow, until field end or another access_as
 247                          * keyword.
 248                          *
 249                          * In field_flags, preserve the flag bits other than the
 250                          * ACCESS_TYPE bits
 251                          */
 252                         info->field_flags = (u8)
 253                             ((info->
 254                               field_flags & ~(AML_FIELD_ACCESS_TYPE_MASK)) |
 255                              ((u8) ((u32) arg->common.value.integer >> 8)));
 256
 257                         info->attribute = (u8) (arg->common.value.integer);
 258                         break;
 259
 260                 case AML_INT_NAMEDFIELD_OP:
 261
 262                         /* Lookup the name */
 263
 264                         status = acpi_ns_lookup(walk_state->scope_info,
 265                                                 (char *)&arg->named.name,
 266                                                 info->field_type,
 267                                                 ACPI_IMODE_EXECUTE,
 268                                                 ACPI_NS_DONT_OPEN_SCOPE,
 269                                                 walk_state, &info->field_node);
 270                         if (ACPI_FAILURE(status)) {
 271                                 ACPI_REPORT_NSERROR((char *)&arg->named.name,
 272                                                     status);
 273                                 if (status != AE_ALREADY_EXISTS) {
 274                                         return_ACPI_STATUS(status);
 275                                 }
 276
 277                                 /* Already exists, ignore error */
 278                         } else {
 279                                 arg->common.node = info->field_node;
 280                                 info->field_bit_length = arg->common.value.size;
 281
 282                                 /* Create and initialize an object for the new Field Node */
 283
 284                                 status = acpi_ex_prep_field_value(info);
 285                                 if (ACPI_FAILURE(status)) {
 286                                         return_ACPI_STATUS(status);
 287                                 }
 288                         }
 289
 290                         /* Keep track of bit position for the next field */
 291
 292                         position = (acpi_integer) info->field_bit_position
 293                             + (acpi_integer) arg->common.value.size;
 294
 295                         if (position > ACPI_UINT32_MAX) {
 296                                 ACPI_REPORT_ERROR(("Field [%4.4s] bit offset too large (> 0xFFFFFFFF)\n", (char *)&info->field_node->name));
 297                                 return_ACPI_STATUS(AE_SUPPORT);
 298                         }
 299
 300                         info->field_bit_position += info->field_bit_length;
 301                         break;
 302
 303                 default:
 304
 305                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 306                                           "Invalid opcode in field list: %X\n",
 307                                           arg->common.aml_opcode));
 308                         return_ACPI_STATUS(AE_AML_BAD_OPCODE);
 309                 }
 310
 311                 arg = arg->common.next;
 312         }
 313
 314         return_ACPI_STATUS(AE_OK);
 315 }
 316
 317 /*******************************************************************************
 318  *
 319  * FUNCTION:    acpi_ds_create_field
 320  *
 321  * PARAMETERS:  Op              - Op containing the Field definition and args
 322  *              region_node     - Object for the containing Operation Region
 323  *  `           walk_state      - Current method state
 324  *
 325  * RETURN:      Status
 326  *
 327  * DESCRIPTION: Create a new field in the specified operation region
 328  *
 329  ******************************************************************************/
 330
 331 acpi_status
 332 acpi_ds_create_field(union acpi_parse_object *op,
 333                      struct acpi_namespace_node *region_node,
 334                      struct acpi_walk_state *walk_state)
 335 {
 336         acpi_status status;
 337         union acpi_parse_object *arg;
 338         struct acpi_create_field_info info;
 339
 340         ACPI_FUNCTION_TRACE_PTR("ds_create_field", op);
 341
 342         /* First arg is the name of the parent op_region (must already exist) */
 343
 344         arg = op->common.value.arg;
 345         if (!region_node) {
 346                 status =
 347                     acpi_ns_lookup(walk_state->scope_info,
 348                                    arg->common.value.name, ACPI_TYPE_REGION,
 349                                    ACPI_IMODE_EXECUTE, ACPI_NS_SEARCH_PARENT,
 350                                    walk_state, &region_node);
 351                 if (ACPI_FAILURE(status)) {
 352                         ACPI_REPORT_NSERROR(arg->common.value.name, status);
 353                         return_ACPI_STATUS(status);
 354                 }
 355         }
 356
 357         /* Second arg is the field flags */
 358
 359         arg = arg->common.next;
 360         info.field_flags = (u8) arg->common.value.integer;
 361         info.attribute = 0;
 362
 363         /* Each remaining arg is a Named Field */
 364
 365         info.field_type = ACPI_TYPE_LOCAL_REGION_FIELD;
 366         info.region_node = region_node;
 367
 368         status = acpi_ds_get_field_names(&info, walk_state, arg->common.next);
 369
 370         return_ACPI_STATUS(status);
 371 }
 372
 373 /*******************************************************************************
 374  *
 375  * FUNCTION:    acpi_ds_init_field_objects
 376  *
 377  * PARAMETERS:  Op              - Op containing the Field definition and args
 378  *  `           walk_state      - Current method state
 379  *
 380  * RETURN:      Status
 381  *
 382  * DESCRIPTION: For each "Field Unit" name in the argument list that is
 383  *              part of the field declaration, enter the name into the
 384  *              namespace.
 385  *
 386  ******************************************************************************/
 387
 388 acpi_status
 389 acpi_ds_init_field_objects(union acpi_parse_object *op,
 390                            struct acpi_walk_state *walk_state)
 391 {
 392         acpi_status status;
 393         union acpi_parse_object *arg = NULL;
 394         struct acpi_namespace_node *node;
 395         u8 type = 0;
 396
 397         ACPI_FUNCTION_TRACE_PTR("ds_init_field_objects", op);
 398
 399         switch (walk_state->opcode) {
 400         case AML_FIELD_OP:
 401                 arg = acpi_ps_get_arg(op, 2);
 402                 type = ACPI_TYPE_LOCAL_REGION_FIELD;
 403                 break;
 404
 405         case AML_BANK_FIELD_OP:
 406                 arg = acpi_ps_get_arg(op, 4);
 407                 type = ACPI_TYPE_LOCAL_BANK_FIELD;
 408                 break;
 409
 410         case AML_INDEX_FIELD_OP:
 411                 arg = acpi_ps_get_arg(op, 3);
 412                 type = ACPI_TYPE_LOCAL_INDEX_FIELD;
 413                 break;
 414
 415         default:
 416                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 417         }
 418
 419         /*
 420          * Walk the list of entries in the field_list
 421          */
 422         while (arg) {
 423                 /* Ignore OFFSET and ACCESSAS terms here */
 424
 425                 if (arg->common.aml_opcode == AML_INT_NAMEDFIELD_OP) {
 426                         status = acpi_ns_lookup(walk_state->scope_info,
 427                                                 (char *)&arg->named.name,
 428                                                 type, ACPI_IMODE_LOAD_PASS1,
 429                                                 ACPI_NS_NO_UPSEARCH |
 430                                                 ACPI_NS_DONT_OPEN_SCOPE |
 431                                                 ACPI_NS_ERROR_IF_FOUND,
 432                                                 walk_state, &node);
 433                         if (ACPI_FAILURE(status)) {
 434                                 ACPI_REPORT_NSERROR((char *)&arg->named.name,
 435                                                     status);
 436                                 if (status != AE_ALREADY_EXISTS) {
 437                                         return_ACPI_STATUS(status);
 438                                 }
 439
 440                                 /* Name already exists, just ignore this error */
 441
 442                                 status = AE_OK;
 443                         }
 444
 445                         arg->common.node = node;
 446                 }
 447
 448                 /* Move to next field in the list */
 449
 450                 arg = arg->common.next;
 451         }
 452
 453         return_ACPI_STATUS(AE_OK);
 454 }
 455
 456 /*******************************************************************************
 457  *
 458  * FUNCTION:    acpi_ds_create_bank_field
 459  *
 460  * PARAMETERS:  Op              - Op containing the Field definition and args
 461  *              region_node     - Object for the containing Operation Region
 462  *  `           walk_state      - Current method state
 463  *
 464  * RETURN:      Status
 465  *
 466  * DESCRIPTION: Create a new bank field in the specified operation region
 467  *
 468  ******************************************************************************/
 469
 470 acpi_status
 471 acpi_ds_create_bank_field(union acpi_parse_object *op,
 472                           struct acpi_namespace_node *region_node,
 473                           struct acpi_walk_state *walk_state)
 474 {
 475         acpi_status status;
 476         union acpi_parse_object *arg;
 477         struct acpi_create_field_info info;
 478
 479         ACPI_FUNCTION_TRACE_PTR("ds_create_bank_field", op);
 480
 481         /* First arg is the name of the parent op_region (must already exist) */
 482
 483         arg = op->common.value.arg;
 484         if (!region_node) {
 485                 status =
 486                     acpi_ns_lookup(walk_state->scope_info,
 487                                    arg->common.value.name, ACPI_TYPE_REGION,
 488                                    ACPI_IMODE_EXECUTE, ACPI_NS_SEARCH_PARENT,
 489                                    walk_state, &region_node);
 490                 if (ACPI_FAILURE(status)) {
 491                         ACPI_REPORT_NSERROR(arg->common.value.name, status);
 492                         return_ACPI_STATUS(status);
 493                 }
 494         }
 495
 496         /* Second arg is the Bank Register (Field) (must already exist) */
 497
 498         arg = arg->common.next;
 499         status =
 500             acpi_ns_lookup(walk_state->scope_info, arg->common.value.string,
 501                            ACPI_TYPE_ANY, ACPI_IMODE_EXECUTE,
 502                            ACPI_NS_SEARCH_PARENT, walk_state,
 503                            &info.register_node);
 504         if (ACPI_FAILURE(status)) {
 505                 ACPI_REPORT_NSERROR(arg->common.value.string, status);
 506                 return_ACPI_STATUS(status);
 507         }
 508
 509         /* Third arg is the bank_value */
 510
 511         arg = arg->common.next;
 512         info.bank_value = (u32) arg->common.value.integer;
 513
 514         /* Fourth arg is the field flags */
 515
 516         arg = arg->common.next;
 517         info.field_flags = (u8) arg->common.value.integer;
 518
 519         /* Each remaining arg is a Named Field */
 520
 521         info.field_type = ACPI_TYPE_LOCAL_BANK_FIELD;
 522         info.region_node = region_node;
 523
 524         status = acpi_ds_get_field_names(&info, walk_state, arg->common.next);
 525
 526         return_ACPI_STATUS(status);
 527 }
 528
 529 /*******************************************************************************
 530  *
 531  * FUNCTION:    acpi_ds_create_index_field
 532  *
 533  * PARAMETERS:  Op              - Op containing the Field definition and args
 534  *              region_node     - Object for the containing Operation Region
 535  *  `           walk_state      - Current method state
 536  *
 537  * RETURN:      Status
 538  *
 539  * DESCRIPTION: Create a new index field in the specified operation region
 540  *
 541  ******************************************************************************/
 542
 543 acpi_status
 544 acpi_ds_create_index_field(union acpi_parse_object *op,
 545                            struct acpi_namespace_node *region_node,
 546                            struct acpi_walk_state *walk_state)
 547 {
 548         acpi_status status;
 549         union acpi_parse_object *arg;
 550         struct acpi_create_field_info info;
 551
 552         ACPI_FUNCTION_TRACE_PTR("ds_create_index_field", op);
 553
 554         /* First arg is the name of the Index register (must already exist) */
 555
 556         arg = op->common.value.arg;
 557         status =
 558             acpi_ns_lookup(walk_state->scope_info, arg->common.value.string,
 559                            ACPI_TYPE_ANY, ACPI_IMODE_EXECUTE,
 560                            ACPI_NS_SEARCH_PARENT, walk_state,
 561                            &info.register_node);
 562         if (ACPI_FAILURE(status)) {
 563                 ACPI_REPORT_NSERROR(arg->common.value.string, status);
 564                 return_ACPI_STATUS(status);
 565         }
 566
 567         /* Second arg is the data register (must already exist) */
 568
 569         arg = arg->common.next;
 570         status =
 571             acpi_ns_lookup(walk_state->scope_info, arg->common.value.string,
 572                            ACPI_TYPE_ANY, ACPI_IMODE_EXECUTE,
 573                            ACPI_NS_SEARCH_PARENT, walk_state,
 574                            &info.data_register_node);
 575         if (ACPI_FAILURE(status)) {
 576                 ACPI_REPORT_NSERROR(arg->common.value.string, status);
 577                 return_ACPI_STATUS(status);
 578         }
 579
 580         /* Next arg is the field flags */
 581
 582         arg = arg->common.next;
 583         info.field_flags = (u8) arg->common.value.integer;
 584
 585         /* Each remaining arg is a Named Field */
 586
 587         info.field_type = ACPI_TYPE_LOCAL_INDEX_FIELD;
 588         info.region_node = region_node;
 589
 590         status = acpi_ds_get_field_names(&info, walk_state, arg->common.next);
 591
 592         return_ACPI_STATUS(status);
 593 }