drivers/acpi/acpica/dsfield.c

   1 // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
   2 /******************************************************************************
   3  *
   4  * Module Name: dsfield - Dispatcher field routines
   5  *
   6  * Copyright (C) 2000 - 2020, Intel Corp.
   7  *
   8  *****************************************************************************/
   9
  10 #include <acpi/acpi.h>
  11 #include "accommon.h"
  12 #include "amlcode.h"
  13 #include "acdispat.h"
  14 #include "acinterp.h"
  15 #include "acnamesp.h"
  16 #include "acparser.h"
  17
  18 #ifdef ACPI_EXEC_APP
  19 #include "aecommon.h"
  20 #endif
  21
  22 #define _COMPONENT          ACPI_DISPATCHER
  23 ACPI_MODULE_NAME("dsfield")
  24
  25 /* Local prototypes */
  26 #ifdef ACPI_ASL_COMPILER
  27 #include "acdisasm.h"
  28 static acpi_status
  29 acpi_ds_create_external_region(acpi_status lookup_status,
  30                                union acpi_parse_object *op,
  31                                char *path,
  32                                struct acpi_walk_state *walk_state,
  33                                struct acpi_namespace_node **node);
  34 #endif
  35
  36 static acpi_status
  37 acpi_ds_get_field_names(struct acpi_create_field_info *info,
  38                         struct acpi_walk_state *walk_state,
  39                         union acpi_parse_object *arg);
  40
  41 #ifdef ACPI_ASL_COMPILER
  42 /*******************************************************************************
  43  *
  44  * FUNCTION:    acpi_ds_create_external_region (iASL Disassembler only)
  45  *
  46  * PARAMETERS:  lookup_status   - Status from ns_lookup operation
  47  *              op              - Op containing the Field definition and args
  48  *              path            - Pathname of the region
  49  *  `           walk_state      - Current method state
  50  *              node            - Where the new region node is returned
  51  *
  52  * RETURN:      Status
  53  *
  54  * DESCRIPTION: Add region to the external list if NOT_FOUND. Create a new
  55  *              region node/object.
  56  *
  57  ******************************************************************************/
  58
  59 static acpi_status
  60 acpi_ds_create_external_region(acpi_status lookup_status,
  61                                union acpi_parse_object *op,
  62                                char *path,
  63                                struct acpi_walk_state *walk_state,
  64                                struct acpi_namespace_node **node)
  65 {
  66         acpi_status status;
  67         union acpi_operand_object *obj_desc;
  68
  69         if (lookup_status != AE_NOT_FOUND) {
  70                 return (lookup_status);
  71         }
  72
  73         /*
  74          * Table disassembly:
  75          * operation_region not found. Generate an External for it, and
  76          * insert the name into the namespace.
  77          */
  78         acpi_dm_add_op_to_external_list(op, path, ACPI_TYPE_REGION, 0, 0);
  79
  80         status = acpi_ns_lookup(walk_state->scope_info, path, ACPI_TYPE_REGION,
  81                                 ACPI_IMODE_LOAD_PASS1, ACPI_NS_SEARCH_PARENT,
  82                                 walk_state, node);
  83         if (ACPI_FAILURE(status)) {
  84                 return (status);
  85         }
  86
  87         /* Must create and install a region object for the new node */
  88
  89         obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_REGION);
  90         if (!obj_desc) {
  91                 return (AE_NO_MEMORY);
  92         }
  93
  94         obj_desc->region.node = *node;
  95         status = acpi_ns_attach_object(*node, obj_desc, ACPI_TYPE_REGION);
  96         return (status);
  97 }
  98 #endif
  99
 100 /*******************************************************************************
 101  *
 102  * FUNCTION:    acpi_ds_create_buffer_field
 103  *
 104  * PARAMETERS:  op                  - Current parse op (create_XXField)
 105  *              walk_state          - Current state
 106  *
 107  * RETURN:      Status
 108  *
 109  * DESCRIPTION: Execute the create_field operators:
 110  *              create_bit_field_op,
 111  *              create_byte_field_op,
 112  *              create_word_field_op,
 113  *              create_dword_field_op,
 114  *              create_qword_field_op,
 115  *              create_field_op     (all of which define a field in a buffer)
 116  *
 117  ******************************************************************************/
 118
 119 acpi_status
 120 acpi_ds_create_buffer_field(union acpi_parse_object *op,
 121                             struct acpi_walk_state *walk_state)
 122 {
 123         union acpi_parse_object *arg;
 124         struct acpi_namespace_node *node;
 125         acpi_status status;
 126         union acpi_operand_object *obj_desc;
 127         union acpi_operand_object *second_desc = NULL;
 128         u32 flags;
 129
 130         ACPI_FUNCTION_TRACE(ds_create_buffer_field);
 131
 132         /*
 133          * Get the name_string argument (name of the new buffer_field)
 134          */
 135         if (op->common.aml_opcode == AML_CREATE_FIELD_OP) {
 136
 137                 /* For create_field, name is the 4th argument */
 138
 139                 arg = acpi_ps_get_arg(op, 3);
 140         } else {
 141                 /* For all other create_XXXField operators, name is the 3rd argument */
 142
 143                 arg = acpi_ps_get_arg(op, 2);
 144         }
 145
 146         if (!arg) {
 147                 return_ACPI_STATUS(AE_AML_NO_OPERAND);
 148         }
 149
 150         if (walk_state->deferred_node) {
 151                 node = walk_state->deferred_node;
 152         } else {
 153                 /* Execute flag should always be set when this function is entered */
 154
 155                 if (!(walk_state->parse_flags & ACPI_PARSE_EXECUTE)) {
 156                         ACPI_ERROR((AE_INFO, "Parse execute mode is not set"));
 157                         return_ACPI_STATUS(AE_AML_INTERNAL);
 158                 }
 159
 160                 /* Creating new namespace node, should not already exist */
 161
 162                 flags = ACPI_NS_NO_UPSEARCH | ACPI_NS_DONT_OPEN_SCOPE |
 163                     ACPI_NS_ERROR_IF_FOUND;
 164
 165                 /*
 166                  * Mark node temporary if we are executing a normal control
 167                  * method. (Don't mark if this is a module-level code method)
 168                  */
 169                 if (walk_state->method_node &&
 170                     !(walk_state->parse_flags & ACPI_PARSE_MODULE_LEVEL)) {
 171                         flags |= ACPI_NS_TEMPORARY;
 172                 }
 173
 174                 /* Enter the name_string into the namespace */
 175
 176                 status = acpi_ns_lookup(walk_state->scope_info,
 177                                         arg->common.value.string, ACPI_TYPE_ANY,
 178                                         ACPI_IMODE_LOAD_PASS1, flags,
 179                                         walk_state, &node);
 180                 if (ACPI_FAILURE(status)) {
 181                         ACPI_ERROR_NAMESPACE(walk_state->scope_info,
 182                                              arg->common.value.string, status);
 183                         return_ACPI_STATUS(status);
 184                 }
 185         }
 186
 187         /*
 188          * We could put the returned object (Node) on the object stack for later,
 189          * but for now, we will put it in the "op" object that the parser uses,
 190          * so we can get it again at the end of this scope.
 191          */
 192         op->common.node = node;
 193
 194         /*
 195          * If there is no object attached to the node, this node was just created
 196          * and we need to create the field object. Otherwise, this was a lookup
 197          * of an existing node and we don't want to create the field object again.
 198          */
 199         obj_desc = acpi_ns_get_attached_object(node);
 200         if (obj_desc) {
 201                 return_ACPI_STATUS(AE_OK);
 202         }
 203
 204         /*
 205          * The Field definition is not fully parsed at this time.
 206          * (We must save the address of the AML for the buffer and index operands)
 207          */
 208
 209         /* Create the buffer field object */
 210
 211         obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_BUFFER_FIELD);
 212         if (!obj_desc) {
 213                 status = AE_NO_MEMORY;
 214                 goto cleanup;
 215         }
 216
 217         /*
 218          * Remember location in AML stream of the field unit opcode and operands
 219          * -- since the buffer and index operands must be evaluated.
 220          */
 221         second_desc = obj_desc->common.next_object;
 222         second_desc->extra.aml_start = op->named.data;
 223         second_desc->extra.aml_length = op->named.length;
 224         obj_desc->buffer_field.node = node;
 225
 226         /* Attach constructed field descriptors to parent node */
 227
 228         status = acpi_ns_attach_object(node, obj_desc, ACPI_TYPE_BUFFER_FIELD);
 229         if (ACPI_FAILURE(status)) {
 230                 goto cleanup;
 231         }
 232
 233 cleanup:
 234
 235         /* Remove local reference to the object */
 236
 237         acpi_ut_remove_reference(obj_desc);
 238         return_ACPI_STATUS(status);
 239 }
 240
 241 /*******************************************************************************
 242  *
 243  * FUNCTION:    acpi_ds_get_field_names
 244  *
 245  * PARAMETERS:  info            - create_field info structure
 246  *              walk_state      - Current method state
 247  *              arg             - First parser arg for the field name list
 248  *
 249  * RETURN:      Status
 250  *
 251  * DESCRIPTION: Process all named fields in a field declaration. Names are
 252  *              entered into the namespace.
 253  *
 254  ******************************************************************************/
 255
 256 static acpi_status
 257 acpi_ds_get_field_names(struct acpi_create_field_info *info,
 258                         struct acpi_walk_state *walk_state,
 259                         union acpi_parse_object *arg)
 260 {
 261         acpi_status status;
 262         u64 position;
 263         union acpi_parse_object *child;
 264
 265 #ifdef ACPI_EXEC_APP
 266         union acpi_operand_object *result_desc;
 267         union acpi_operand_object *obj_desc;
 268         char *name_path;
 269 #endif
 270
 271         ACPI_FUNCTION_TRACE_PTR(ds_get_field_names, info);
 272
 273         /* First field starts at bit zero */
 274
 275         info->field_bit_position = 0;
 276
 277         /* Process all elements in the field list (of parse nodes) */
 278
 279         while (arg) {
 280                 /*
 281                  * Four types of field elements are handled:
 282                  * 1) name - Enters a new named field into the namespace
 283                  * 2) offset - specifies a bit offset
 284                  * 3) access_as - changes the access mode/attributes
 285                  * 4) connection - Associate a resource template with the field
 286                  */
 287                 switch (arg->common.aml_opcode) {
 288                 case AML_INT_RESERVEDFIELD_OP:
 289
 290                         position = (u64)info->field_bit_position +
 291                             (u64)arg->common.value.size;
 292
 293                         if (position > ACPI_UINT32_MAX) {
 294                                 ACPI_ERROR((AE_INFO,
 295                                             "Bit offset within field too large (> 0xFFFFFFFF)"));
 296                                 return_ACPI_STATUS(AE_SUPPORT);
 297                         }
 298
 299                         info->field_bit_position = (u32) position;
 300                         break;
 301
 302                 case AML_INT_ACCESSFIELD_OP:
 303                 case AML_INT_EXTACCESSFIELD_OP:
 304                         /*
 305                          * Get new access_type, access_attribute, and access_length fields
 306                          * -- to be used for all field units that follow, until the
 307                          * end-of-field or another access_as keyword is encountered.
 308                          * NOTE. These three bytes are encoded in the integer value
 309                          * of the parseop for convenience.
 310                          *
 311                          * In field_flags, preserve the flag bits other than the
 312                          * ACCESS_TYPE bits.
 313                          */
 314
 315                         /* access_type (byte_acc, word_acc, etc.) */
 316
 317                         info->field_flags = (u8)
 318                             ((info->
 319                               field_flags & ~(AML_FIELD_ACCESS_TYPE_MASK)) |
 320                              ((u8)((u32)(arg->common.value.integer & 0x07))));
 321
 322                         /* access_attribute (attrib_quick, attrib_byte, etc.) */
 323
 324                         info->attribute = (u8)
 325                             ((arg->common.value.integer >> 8) & 0xFF);
 326
 327                         /* access_length (for serial/buffer protocols) */
 328
 329                         info->access_length = (u8)
 330                             ((arg->common.value.integer >> 16) & 0xFF);
 331                         break;
 332
 333                 case AML_INT_CONNECTION_OP:
 334                         /*
 335                          * Clear any previous connection. New connection is used for all
 336                          * fields that follow, similar to access_as
 337                          */
 338                         info->resource_buffer = NULL;
 339                         info->connection_node = NULL;
 340                         info->pin_number_index = 0;
 341
 342                         /*
 343                          * A Connection() is either an actual resource descriptor (buffer)
 344                          * or a named reference to a resource template
 345                          */
 346                         child = arg->common.value.arg;
 347                         if (child->common.aml_opcode == AML_INT_BYTELIST_OP) {
 348                                 info->resource_buffer = child->named.data;
 349                                 info->resource_length =
 350                                     (u16)child->named.value.integer;
 351                         } else {
 352                                 /* Lookup the Connection() namepath, it should already exist */
 353
 354                                 status = acpi_ns_lookup(walk_state->scope_info,
 355                                                         child->common.value.
 356                                                         name, ACPI_TYPE_ANY,
 357                                                         ACPI_IMODE_EXECUTE,
 358                                                         ACPI_NS_DONT_OPEN_SCOPE,
 359                                                         walk_state,
 360                                                         &info->connection_node);
 361                                 if (ACPI_FAILURE(status)) {
 362                                         ACPI_ERROR_NAMESPACE(walk_state->
 363                                                              scope_info,
 364                                                              child->common.
 365                                                              value.name,
 366                                                              status);
 367                                         return_ACPI_STATUS(status);
 368                                 }
 369                         }
 370                         break;
 371
 372                 case AML_INT_NAMEDFIELD_OP:
 373
 374                         /* Lookup the name, it should already exist */
 375
 376                         status = acpi_ns_lookup(walk_state->scope_info,
 377                                                 (char *)&arg->named.name,
 378                                                 info->field_type,
 379                                                 ACPI_IMODE_EXECUTE,
 380                                                 ACPI_NS_DONT_OPEN_SCOPE,
 381                                                 walk_state, &info->field_node);
 382                         if (ACPI_FAILURE(status)) {
 383                                 ACPI_ERROR_NAMESPACE(walk_state->scope_info,
 384                                                      (char *)&arg->named.name,
 385                                                      status);
 386                                 return_ACPI_STATUS(status);
 387                         } else {
 388                                 arg->common.node = info->field_node;
 389                                 info->field_bit_length = arg->common.value.size;
 390
 391                                 /*
 392                                  * If there is no object attached to the node, this node was
 393                                  * just created and we need to create the field object.
 394                                  * Otherwise, this was a lookup of an existing node and we
 395                                  * don't want to create the field object again.
 396                                  */
 397                                 if (!acpi_ns_get_attached_object
 398                                     (info->field_node)) {
 399                                         status = acpi_ex_prep_field_value(info);
 400                                         if (ACPI_FAILURE(status)) {
 401                                                 return_ACPI_STATUS(status);
 402                                         }
 403 #ifdef ACPI_EXEC_APP
 404                                         name_path =
 405                                             acpi_ns_get_external_pathname(info->
 406                                                                           field_node);
 407                                         if (ACPI_SUCCESS
 408                                             (ae_lookup_init_file_entry
 409                                              (name_path, &obj_desc))) {
 410                                                 acpi_ex_write_data_to_field
 411                                                     (obj_desc,
 412                                                      acpi_ns_get_attached_object
 413                                                      (info->field_node),
 414                                                      &result_desc);
 415                                                 acpi_ut_remove_reference
 416                                                     (obj_desc);
 417                                         }
 418                                         ACPI_FREE(name_path);
 419 #endif
 420                                 }
 421                         }
 422
 423                         /* Keep track of bit position for the next field */
 424
 425                         position = (u64)info->field_bit_position +
 426                             (u64)arg->common.value.size;
 427
 428                         if (position > ACPI_UINT32_MAX) {
 429                                 ACPI_ERROR((AE_INFO,
 430                                             "Field [%4.4s] bit offset too large (> 0xFFFFFFFF)",
 431                                             ACPI_CAST_PTR(char,
 432                                                           &info->field_node->
 433                                                           name)));
 434                                 return_ACPI_STATUS(AE_SUPPORT);
 435                         }
 436
 437                         info->field_bit_position += info->field_bit_length;
 438                         info->pin_number_index++;       /* Index relative to previous Connection() */
 439                         break;
 440
 441                 default:
 442
 443                         ACPI_ERROR((AE_INFO,
 444                                     "Invalid opcode in field list: 0x%X",
 445                                     arg->common.aml_opcode));
 446                         return_ACPI_STATUS(AE_AML_BAD_OPCODE);
 447                 }
 448
 449                 arg = arg->common.next;
 450         }
 451
 452         return_ACPI_STATUS(AE_OK);
 453 }
 454
 455 /*******************************************************************************
 456  *
 457  * FUNCTION:    acpi_ds_create_field
 458  *
 459  * PARAMETERS:  op              - Op containing the Field definition and args
 460  *              region_node     - Object for the containing Operation Region
 461  *  `           walk_state      - Current method state
 462  *
 463  * RETURN:      Status
 464  *
 465  * DESCRIPTION: Create a new field in the specified operation region
 466  *
 467  ******************************************************************************/
 468
 469 acpi_status
 470 acpi_ds_create_field(union acpi_parse_object *op,
 471                      struct acpi_namespace_node *region_node,
 472                      struct acpi_walk_state *walk_state)
 473 {
 474         acpi_status status;
 475         union acpi_parse_object *arg;
 476         struct acpi_create_field_info info;
 477
 478         ACPI_FUNCTION_TRACE_PTR(ds_create_field, op);
 479
 480         /* First arg is the name of the parent op_region (must already exist) */
 481
 482         arg = op->common.value.arg;
 483
 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 #ifdef ACPI_ASL_COMPILER
 491                 status = acpi_ds_create_external_region(status, arg,
 492                                                         arg->common.value.name,
 493                                                         walk_state,
 494                                                         &region_node);
 495 #endif
 496                 if (ACPI_FAILURE(status)) {
 497                         ACPI_ERROR_NAMESPACE(walk_state->scope_info,
 498                                              arg->common.value.name, status);
 499                         return_ACPI_STATUS(status);
 500                 }
 501         }
 502
 503         memset(&info, 0, sizeof(struct acpi_create_field_info));
 504
 505         /* Second arg is the field flags */
 506
 507         arg = arg->common.next;
 508         info.field_flags = (u8) arg->common.value.integer;
 509         info.attribute = 0;
 510
 511         /* Each remaining arg is a Named Field */
 512
 513         info.field_type = ACPI_TYPE_LOCAL_REGION_FIELD;
 514         info.region_node = region_node;
 515
 516         status = acpi_ds_get_field_names(&info, walk_state, arg->common.next);
 517         if (ACPI_FAILURE(status)) {
 518                 return_ACPI_STATUS(status);
 519         }
 520
 521         if (info.region_node->object->region.space_id ==
 522             ACPI_ADR_SPACE_PLATFORM_COMM) {
 523                 region_node->object->field.internal_pcc_buffer =
 524                     ACPI_ALLOCATE_ZEROED(info.region_node->object->region.
 525                                          length);
 526                 if (!region_node->object->field.internal_pcc_buffer) {
 527                         return_ACPI_STATUS(AE_NO_MEMORY);
 528                 }
 529         }
 530
 531         return_ACPI_STATUS(status);
 532 }
 533
 534 /*******************************************************************************
 535  *
 536  * FUNCTION:    acpi_ds_init_field_objects
 537  *
 538  * PARAMETERS:  op              - Op containing the Field definition and args
 539  *  `           walk_state      - Current method state
 540  *
 541  * RETURN:      Status
 542  *
 543  * DESCRIPTION: For each "Field Unit" name in the argument list that is
 544  *              part of the field declaration, enter the name into the
 545  *              namespace.
 546  *
 547  ******************************************************************************/
 548
 549 acpi_status
 550 acpi_ds_init_field_objects(union acpi_parse_object *op,
 551                            struct acpi_walk_state *walk_state)
 552 {
 553         acpi_status status;
 554         union acpi_parse_object *arg = NULL;
 555         struct acpi_namespace_node *node;
 556         u8 type = 0;
 557         u32 flags;
 558
 559         ACPI_FUNCTION_TRACE_PTR(ds_init_field_objects, op);
 560
 561         /* Execute flag should always be set when this function is entered */
 562
 563         if (!(walk_state->parse_flags & ACPI_PARSE_EXECUTE)) {
 564                 if (walk_state->parse_flags & ACPI_PARSE_DEFERRED_OP) {
 565
 566                         /* bank_field Op is deferred, just return OK */
 567
 568                         return_ACPI_STATUS(AE_OK);
 569                 }
 570
 571                 ACPI_ERROR((AE_INFO, "Parse deferred mode is not set"));
 572                 return_ACPI_STATUS(AE_AML_INTERNAL);
 573         }
 574
 575         /*
 576          * Get the field_list argument for this opcode. This is the start of the
 577          * list of field elements.
 578          */
 579         switch (walk_state->opcode) {
 580         case AML_FIELD_OP:
 581
 582                 arg = acpi_ps_get_arg(op, 2);
 583                 type = ACPI_TYPE_LOCAL_REGION_FIELD;
 584                 break;
 585
 586         case AML_BANK_FIELD_OP:
 587
 588                 arg = acpi_ps_get_arg(op, 4);
 589                 type = ACPI_TYPE_LOCAL_BANK_FIELD;
 590                 break;
 591
 592         case AML_INDEX_FIELD_OP:
 593
 594                 arg = acpi_ps_get_arg(op, 3);
 595                 type = ACPI_TYPE_LOCAL_INDEX_FIELD;
 596                 break;
 597
 598         default:
 599
 600                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 601         }
 602
 603         /* Creating new namespace node(s), should not already exist */
 604
 605         flags = ACPI_NS_NO_UPSEARCH | ACPI_NS_DONT_OPEN_SCOPE |
 606             ACPI_NS_ERROR_IF_FOUND;
 607
 608         /*
 609          * Mark node(s) temporary if we are executing a normal control
 610          * method. (Don't mark if this is a module-level code method)
 611          */
 612         if (walk_state->method_node &&
 613             !(walk_state->parse_flags & ACPI_PARSE_MODULE_LEVEL)) {
 614                 flags |= ACPI_NS_TEMPORARY;
 615         }
 616 #ifdef ACPI_EXEC_APP
 617         flags |= ACPI_NS_OVERRIDE_IF_FOUND;
 618 #endif
 619         /*
 620          * Walk the list of entries in the field_list
 621          * Note: field_list can be of zero length. In this case, Arg will be NULL.
 622          */
 623         while (arg) {
 624                 /*
 625                  * Ignore OFFSET/ACCESSAS/CONNECTION terms here; we are only interested
 626                  * in the field names in order to enter them into the namespace.
 627                  */
 628                 if (arg->common.aml_opcode == AML_INT_NAMEDFIELD_OP) {
 629                         status = acpi_ns_lookup(walk_state->scope_info,
 630                                                 (char *)&arg->named.name, type,
 631                                                 ACPI_IMODE_LOAD_PASS1, flags,
 632                                                 walk_state, &node);
 633                         if (ACPI_FAILURE(status)) {
 634                                 ACPI_ERROR_NAMESPACE(walk_state->scope_info,
 635                                                      (char *)&arg->named.name,
 636                                                      status);
 637                                 if (status != AE_ALREADY_EXISTS) {
 638                                         return_ACPI_STATUS(status);
 639                                 }
 640
 641                                 /* Name already exists, just ignore this error */
 642                         }
 643
 644                         arg->common.node = node;
 645                 }
 646
 647                 /* Get the next field element in the list */
 648
 649                 arg = arg->common.next;
 650         }
 651
 652         return_ACPI_STATUS(AE_OK);
 653 }
 654
 655 /*******************************************************************************
 656  *
 657  * FUNCTION:    acpi_ds_create_bank_field
 658  *
 659  * PARAMETERS:  op              - Op containing the Field definition and args
 660  *              region_node     - Object for the containing Operation Region
 661  *              walk_state      - Current method state
 662  *
 663  * RETURN:      Status
 664  *
 665  * DESCRIPTION: Create a new bank field in the specified operation region
 666  *
 667  ******************************************************************************/
 668
 669 acpi_status
 670 acpi_ds_create_bank_field(union acpi_parse_object *op,
 671                           struct acpi_namespace_node *region_node,
 672                           struct acpi_walk_state *walk_state)
 673 {
 674         acpi_status status;
 675         union acpi_parse_object *arg;
 676         struct acpi_create_field_info info;
 677
 678         ACPI_FUNCTION_TRACE_PTR(ds_create_bank_field, op);
 679
 680         /* First arg is the name of the parent op_region (must already exist) */
 681
 682         arg = op->common.value.arg;
 683         if (!region_node) {
 684                 status =
 685                     acpi_ns_lookup(walk_state->scope_info,
 686                                    arg->common.value.name, ACPI_TYPE_REGION,
 687                                    ACPI_IMODE_EXECUTE, ACPI_NS_SEARCH_PARENT,
 688                                    walk_state, &region_node);
 689 #ifdef ACPI_ASL_COMPILER
 690                 status = acpi_ds_create_external_region(status, arg,
 691                                                         arg->common.value.name,
 692                                                         walk_state,
 693                                                         &region_node);
 694 #endif
 695                 if (ACPI_FAILURE(status)) {
 696                         ACPI_ERROR_NAMESPACE(walk_state->scope_info,
 697                                              arg->common.value.name, status);
 698                         return_ACPI_STATUS(status);
 699                 }
 700         }
 701
 702         /* Second arg is the Bank Register (Field) (must already exist) */
 703
 704         arg = arg->common.next;
 705         status =
 706             acpi_ns_lookup(walk_state->scope_info, arg->common.value.string,
 707                            ACPI_TYPE_ANY, ACPI_IMODE_EXECUTE,
 708                            ACPI_NS_SEARCH_PARENT, walk_state,
 709                            &info.register_node);
 710         if (ACPI_FAILURE(status)) {
 711                 ACPI_ERROR_NAMESPACE(walk_state->scope_info,
 712                                      arg->common.value.string, status);
 713                 return_ACPI_STATUS(status);
 714         }
 715
 716         /*
 717          * Third arg is the bank_value
 718          * This arg is a term_arg, not a constant
 719          * It will be evaluated later, by acpi_ds_eval_bank_field_operands
 720          */
 721         arg = arg->common.next;
 722
 723         /* Fourth arg is the field flags */
 724
 725         arg = arg->common.next;
 726         info.field_flags = (u8) arg->common.value.integer;
 727
 728         /* Each remaining arg is a Named Field */
 729
 730         info.field_type = ACPI_TYPE_LOCAL_BANK_FIELD;
 731         info.region_node = region_node;
 732
 733         /*
 734          * Use Info.data_register_node to store bank_field Op
 735          * It's safe because data_register_node will never be used when create
 736          * bank field \we store aml_start and aml_length in the bank_field Op for
 737          * late evaluation. Used in acpi_ex_prep_field_value(Info)
 738          *
 739          * TBD: Or, should we add a field in struct acpi_create_field_info, like
 740          * "void *ParentOp"?
 741          */
 742         info.data_register_node = (struct acpi_namespace_node *)op;
 743
 744         status = acpi_ds_get_field_names(&info, walk_state, arg->common.next);
 745         return_ACPI_STATUS(status);
 746 }
 747
 748 /*******************************************************************************
 749  *
 750  * FUNCTION:    acpi_ds_create_index_field
 751  *
 752  * PARAMETERS:  op              - Op containing the Field definition and args
 753  *              region_node     - Object for the containing Operation Region
 754  *  `           walk_state      - Current method state
 755  *
 756  * RETURN:      Status
 757  *
 758  * DESCRIPTION: Create a new index field in the specified operation region
 759  *
 760  ******************************************************************************/
 761
 762 acpi_status
 763 acpi_ds_create_index_field(union acpi_parse_object *op,
 764                            struct acpi_namespace_node *region_node,
 765                            struct acpi_walk_state *walk_state)
 766 {
 767         acpi_status status;
 768         union acpi_parse_object *arg;
 769         struct acpi_create_field_info info;
 770
 771         ACPI_FUNCTION_TRACE_PTR(ds_create_index_field, op);
 772
 773         /* First arg is the name of the Index register (must already exist) */
 774
 775         arg = op->common.value.arg;
 776         status =
 777             acpi_ns_lookup(walk_state->scope_info, arg->common.value.string,
 778                            ACPI_TYPE_ANY, ACPI_IMODE_EXECUTE,
 779                            ACPI_NS_SEARCH_PARENT, walk_state,
 780                            &info.register_node);
 781         if (ACPI_FAILURE(status)) {
 782                 ACPI_ERROR_NAMESPACE(walk_state->scope_info,
 783                                      arg->common.value.string, status);
 784                 return_ACPI_STATUS(status);
 785         }
 786
 787         /* Second arg is the data register (must already exist) */
 788
 789         arg = arg->common.next;
 790         status =
 791             acpi_ns_lookup(walk_state->scope_info, arg->common.value.string,
 792                            ACPI_TYPE_ANY, ACPI_IMODE_EXECUTE,
 793                            ACPI_NS_SEARCH_PARENT, walk_state,
 794                            &info.data_register_node);
 795         if (ACPI_FAILURE(status)) {
 796                 ACPI_ERROR_NAMESPACE(walk_state->scope_info,
 797                                      arg->common.value.string, status);
 798                 return_ACPI_STATUS(status);
 799         }
 800
 801         /* Next arg is the field flags */
 802
 803         arg = arg->common.next;
 804         info.field_flags = (u8) arg->common.value.integer;
 805
 806         /* Each remaining arg is a Named Field */
 807
 808         info.field_type = ACPI_TYPE_LOCAL_INDEX_FIELD;
 809         info.region_node = region_node;
 810
 811         status = acpi_ds_get_field_names(&info, walk_state, arg->common.next);
 812         return_ACPI_STATUS(status);
 813 }