err.no 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 - 2006, 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_ERROR_NAMESPACE(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_ERROR((AE_INFO,
 236                                             "Bit offset within field too large (> 0xFFFFFFFF)"));
 237                                 return_ACPI_STATUS(AE_SUPPORT);
 238                         }
 239
 240                         info->field_bit_position = (u32) position;
 241                         break;
 242
 243                 case AML_INT_ACCESSFIELD_OP:
 244
 245                         /*
 246                          * Get a new access_type and access_attribute -- to be used for all
 247                          * field units that follow, until field end or another access_as
 248                          * keyword.
 249                          *
 250                          * In field_flags, preserve the flag bits other than the
 251                          * ACCESS_TYPE bits
 252                          */
 253                         info->field_flags = (u8)
 254                             ((info->
 255                               field_flags & ~(AML_FIELD_ACCESS_TYPE_MASK)) |
 256                              ((u8) ((u32) arg->common.value.integer >> 8)));
 257
 258                         info->attribute = (u8) (arg->common.value.integer);
 259                         break;
 260
 261                 case AML_INT_NAMEDFIELD_OP:
 262
 263                         /* Lookup the name */
 264
 265                         status = acpi_ns_lookup(walk_state->scope_info,
 266                                                 (char *)&arg->named.name,
 267                                                 info->field_type,
 268                                                 ACPI_IMODE_EXECUTE,
 269                                                 ACPI_NS_DONT_OPEN_SCOPE,
 270                                                 walk_state, &info->field_node);
 271                         if (ACPI_FAILURE(status)) {
 272                                 ACPI_ERROR_NAMESPACE((char *)&arg->named.name,
 273                                                      status);
 274                                 if (status != AE_ALREADY_EXISTS) {
 275                                         return_ACPI_STATUS(status);
 276                                 }
 277
 278                                 /* Already exists, ignore error */
 279                         } else {
 280                                 arg->common.node = info->field_node;
 281                                 info->field_bit_length = arg->common.value.size;
 282
 283                                 /* Create and initialize an object for the new Field Node */
 284
 285                                 status = acpi_ex_prep_field_value(info);
 286                                 if (ACPI_FAILURE(status)) {
 287                                         return_ACPI_STATUS(status);
 288                                 }
 289                         }
 290
 291                         /* Keep track of bit position for the next field */
 292
 293                         position = (acpi_integer) info->field_bit_position
 294                             + (acpi_integer) arg->common.value.size;
 295
 296                         if (position > ACPI_UINT32_MAX) {
 297                                 ACPI_ERROR((AE_INFO,
 298                                             "Field [%4.4s] bit offset too large (> 0xFFFFFFFF)",
 299                                             ACPI_CAST_PTR(char,
 300                                                           &info->field_node->
 301                                                           name)));
 302                                 return_ACPI_STATUS(AE_SUPPORT);
 303                         }
 304
 305                         info->field_bit_position += info->field_bit_length;
 306                         break;
 307
 308                 default:
 309
 310                         ACPI_ERROR((AE_INFO,
 311                                     "Invalid opcode in field list: %X",
 312                                     arg->common.aml_opcode));
 313                         return_ACPI_STATUS(AE_AML_BAD_OPCODE);
 314                 }
 315
 316                 arg = arg->common.next;
 317         }
 318
 319         return_ACPI_STATUS(AE_OK);
 320 }
 321
 322 /*******************************************************************************
 323  *
 324  * FUNCTION:    acpi_ds_create_field
 325  *
 326  * PARAMETERS:  Op              - Op containing the Field definition and args
 327  *              region_node     - Object for the containing Operation Region
 328  *  `           walk_state      - Current method state
 329  *
 330  * RETURN:      Status
 331  *
 332  * DESCRIPTION: Create a new field in the specified operation region
 333  *
 334  ******************************************************************************/
 335
 336 acpi_status
 337 acpi_ds_create_field(union acpi_parse_object *op,
 338                      struct acpi_namespace_node *region_node,
 339                      struct acpi_walk_state *walk_state)
 340 {
 341         acpi_status status;
 342         union acpi_parse_object *arg;
 343         struct acpi_create_field_info info;
 344
 345         ACPI_FUNCTION_TRACE_PTR(ds_create_field, op);
 346
 347         /* First arg is the name of the parent op_region (must already exist) */
 348
 349         arg = op->common.value.arg;
 350         if (!region_node) {
 351                 status =
 352                     acpi_ns_lookup(walk_state->scope_info,
 353                                    arg->common.value.name, ACPI_TYPE_REGION,
 354                                    ACPI_IMODE_EXECUTE, ACPI_NS_SEARCH_PARENT,
 355                                    walk_state, &region_node);
 356                 if (ACPI_FAILURE(status)) {
 357                         ACPI_ERROR_NAMESPACE(arg->common.value.name, status);
 358                         return_ACPI_STATUS(status);
 359                 }
 360         }
 361
 362         /* Second arg is the field flags */
 363
 364         arg = arg->common.next;
 365         info.field_flags = (u8) arg->common.value.integer;
 366         info.attribute = 0;
 367
 368         /* Each remaining arg is a Named Field */
 369
 370         info.field_type = ACPI_TYPE_LOCAL_REGION_FIELD;
 371         info.region_node = region_node;
 372
 373         status = acpi_ds_get_field_names(&info, walk_state, arg->common.next);
 374
 375         return_ACPI_STATUS(status);
 376 }
 377
 378 /*******************************************************************************
 379  *
 380  * FUNCTION:    acpi_ds_init_field_objects
 381  *
 382  * PARAMETERS:  Op              - Op containing the Field definition and args
 383  *  `           walk_state      - Current method state
 384  *
 385  * RETURN:      Status
 386  *
 387  * DESCRIPTION: For each "Field Unit" name in the argument list that is
 388  *              part of the field declaration, enter the name into the
 389  *              namespace.
 390  *
 391  ******************************************************************************/
 392
 393 acpi_status
 394 acpi_ds_init_field_objects(union acpi_parse_object *op,
 395                            struct acpi_walk_state *walk_state)
 396 {
 397         acpi_status status;
 398         union acpi_parse_object *arg = NULL;
 399         struct acpi_namespace_node *node;
 400         u8 type = 0;
 401
 402         ACPI_FUNCTION_TRACE_PTR(ds_init_field_objects, op);
 403
 404         switch (walk_state->opcode) {
 405         case AML_FIELD_OP:
 406                 arg = acpi_ps_get_arg(op, 2);
 407                 type = ACPI_TYPE_LOCAL_REGION_FIELD;
 408                 break;
 409
 410         case AML_BANK_FIELD_OP:
 411                 arg = acpi_ps_get_arg(op, 4);
 412                 type = ACPI_TYPE_LOCAL_BANK_FIELD;
 413                 break;
 414
 415         case AML_INDEX_FIELD_OP:
 416                 arg = acpi_ps_get_arg(op, 3);
 417                 type = ACPI_TYPE_LOCAL_INDEX_FIELD;
 418                 break;
 419
 420         default:
 421                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 422         }
 423
 424         /*
 425          * Walk the list of entries in the field_list
 426          */
 427         while (arg) {
 428
 429                 /* Ignore OFFSET and ACCESSAS terms here */
 430
 431                 if (arg->common.aml_opcode == AML_INT_NAMEDFIELD_OP) {
 432                         status = acpi_ns_lookup(walk_state->scope_info,
 433                                                 (char *)&arg->named.name,
 434                                                 type, ACPI_IMODE_LOAD_PASS1,
 435                                                 ACPI_NS_NO_UPSEARCH |
 436                                                 ACPI_NS_DONT_OPEN_SCOPE |
 437                                                 ACPI_NS_ERROR_IF_FOUND,
 438                                                 walk_state, &node);
 439                         if (ACPI_FAILURE(status)) {
 440                                 ACPI_ERROR_NAMESPACE((char *)&arg->named.name,
 441                                                      status);
 442                                 if (status != AE_ALREADY_EXISTS) {
 443                                         return_ACPI_STATUS(status);
 444                                 }
 445
 446                                 /* Name already exists, just ignore this error */
 447
 448                                 status = AE_OK;
 449                         }
 450
 451                         arg->common.node = node;
 452                 }
 453
 454                 /* Move to next field in the list */
 455
 456                 arg = arg->common.next;
 457         }
 458
 459         return_ACPI_STATUS(AE_OK);
 460 }
 461
 462 /*******************************************************************************
 463  *
 464  * FUNCTION:    acpi_ds_create_bank_field
 465  *
 466  * PARAMETERS:  Op              - Op containing the Field definition and args
 467  *              region_node     - Object for the containing Operation Region
 468  *  `           walk_state      - Current method state
 469  *
 470  * RETURN:      Status
 471  *
 472  * DESCRIPTION: Create a new bank field in the specified operation region
 473  *
 474  ******************************************************************************/
 475
 476 acpi_status
 477 acpi_ds_create_bank_field(union acpi_parse_object *op,
 478                           struct acpi_namespace_node *region_node,
 479                           struct acpi_walk_state *walk_state)
 480 {
 481         acpi_status status;
 482         union acpi_parse_object *arg;
 483         struct acpi_create_field_info info;
 484
 485         ACPI_FUNCTION_TRACE_PTR(ds_create_bank_field, op);
 486
 487         /* First arg is the name of the parent op_region (must already exist) */
 488
 489         arg = op->common.value.arg;
 490         if (!region_node) {
 491                 status =
 492                     acpi_ns_lookup(walk_state->scope_info,
 493                                    arg->common.value.name, ACPI_TYPE_REGION,
 494                                    ACPI_IMODE_EXECUTE, ACPI_NS_SEARCH_PARENT,
 495                                    walk_state, &region_node);
 496                 if (ACPI_FAILURE(status)) {
 497                         ACPI_ERROR_NAMESPACE(arg->common.value.name, status);
 498                         return_ACPI_STATUS(status);
 499                 }
 500         }
 501
 502         /* Second arg is the Bank Register (Field) (must already exist) */
 503
 504         arg = arg->common.next;
 505         status =
 506             acpi_ns_lookup(walk_state->scope_info, arg->common.value.string,
 507                            ACPI_TYPE_ANY, ACPI_IMODE_EXECUTE,
 508                            ACPI_NS_SEARCH_PARENT, walk_state,
 509                            &info.register_node);
 510         if (ACPI_FAILURE(status)) {
 511                 ACPI_ERROR_NAMESPACE(arg->common.value.string, status);
 512                 return_ACPI_STATUS(status);
 513         }
 514
 515         /* Third arg is the bank_value */
 516
 517         arg = arg->common.next;
 518         info.bank_value = (u32) arg->common.value.integer;
 519
 520         /* Fourth arg is the field flags */
 521
 522         arg = arg->common.next;
 523         info.field_flags = (u8) arg->common.value.integer;
 524
 525         /* Each remaining arg is a Named Field */
 526
 527         info.field_type = ACPI_TYPE_LOCAL_BANK_FIELD;
 528         info.region_node = region_node;
 529
 530         status = acpi_ds_get_field_names(&info, walk_state, arg->common.next);
 531
 532         return_ACPI_STATUS(status);
 533 }
 534
 535 /*******************************************************************************
 536  *
 537  * FUNCTION:    acpi_ds_create_index_field
 538  *
 539  * PARAMETERS:  Op              - Op containing the Field definition and args
 540  *              region_node     - Object for the containing Operation Region
 541  *  `           walk_state      - Current method state
 542  *
 543  * RETURN:      Status
 544  *
 545  * DESCRIPTION: Create a new index field in the specified operation region
 546  *
 547  ******************************************************************************/
 548
 549 acpi_status
 550 acpi_ds_create_index_field(union acpi_parse_object *op,
 551                            struct acpi_namespace_node *region_node,
 552                            struct acpi_walk_state *walk_state)
 553 {
 554         acpi_status status;
 555         union acpi_parse_object *arg;
 556         struct acpi_create_field_info info;
 557
 558         ACPI_FUNCTION_TRACE_PTR(ds_create_index_field, op);
 559
 560         /* First arg is the name of the Index register (must already exist) */
 561
 562         arg = op->common.value.arg;
 563         status =
 564             acpi_ns_lookup(walk_state->scope_info, arg->common.value.string,
 565                            ACPI_TYPE_ANY, ACPI_IMODE_EXECUTE,
 566                            ACPI_NS_SEARCH_PARENT, walk_state,
 567                            &info.register_node);
 568         if (ACPI_FAILURE(status)) {
 569                 ACPI_ERROR_NAMESPACE(arg->common.value.string, status);
 570                 return_ACPI_STATUS(status);
 571         }
 572
 573         /* Second arg is the data register (must already exist) */
 574
 575         arg = arg->common.next;
 576         status =
 577             acpi_ns_lookup(walk_state->scope_info, arg->common.value.string,
 578                            ACPI_TYPE_ANY, ACPI_IMODE_EXECUTE,
 579                            ACPI_NS_SEARCH_PARENT, walk_state,
 580                            &info.data_register_node);
 581         if (ACPI_FAILURE(status)) {
 582                 ACPI_ERROR_NAMESPACE(arg->common.value.string, status);
 583                 return_ACPI_STATUS(status);
 584         }
 585
 586         /* Next arg is the field flags */
 587
 588         arg = arg->common.next;
 589         info.field_flags = (u8) arg->common.value.integer;
 590
 591         /* Each remaining arg is a Named Field */
 592
 593         info.field_type = ACPI_TYPE_LOCAL_INDEX_FIELD;
 594         info.region_node = region_node;
 595
 596         status = acpi_ds_get_field_names(&info, walk_state, arg->common.next);
 597
 598         return_ACPI_STATUS(status);
 599 }