LXR linux/drivers/acpi/acpica/dsfield.c

   1/******************************************************************************
   2 *
   3 * Module Name: dsfield - Dispatcher field routines
   4 *
   5 *****************************************************************************/
   6
   7/*
   8 * Copyright (C) 2000 - 2016, 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 "amlcode.h"
  47#include "acdispat.h"
  48#include "acinterp.h"
  49#include "acnamesp.h"
  50#include "acparser.h"
  51
  52#define _COMPONENT          ACPI_DISPATCHER
  53ACPI_MODULE_NAME("dsfield")
  54
  55/* Local prototypes */
  56#ifdef ACPI_ASL_COMPILER
  57#include "acdisasm.h"
  58static acpi_status
  59acpi_ds_create_external_region(acpi_status lookup_status,
  60                               union acpi_parse_object *op,
  61                               char *path,
  62                               struct acpi_walk_state *walk_state,
  63                               struct acpi_namespace_node **node);
  64#endif
  65
  66static acpi_status
  67acpi_ds_get_field_names(struct acpi_create_field_info *info,
  68                        struct acpi_walk_state *walk_state,
  69                        union acpi_parse_object *arg);
  70
  71#ifdef ACPI_ASL_COMPILER
  72/*******************************************************************************
  73 *
  74 * FUNCTION:    acpi_ds_create_external_region (iASL Disassembler only)
  75 *
  76 * PARAMETERS:  lookup_status   - Status from ns_lookup operation
  77 *              op              - Op containing the Field definition and args
  78 *              path            - Pathname of the region
  79 *  `           walk_state      - Current method state
  80 *              node            - Where the new region node is returned
  81 *
  82 * RETURN:      Status
  83 *
  84 * DESCRIPTION: Add region to the external list if NOT_FOUND. Create a new
  85 *              region node/object.
  86 *
  87 ******************************************************************************/
  88
  89static acpi_status
  90acpi_ds_create_external_region(acpi_status lookup_status,
  91                               union acpi_parse_object *op,
  92                               char *path,
  93                               struct acpi_walk_state *walk_state,
  94                               struct acpi_namespace_node **node)
  95{
  96        acpi_status status;
  97        union acpi_operand_object *obj_desc;
  98
  99        if (lookup_status != AE_NOT_FOUND) {
 100                return (lookup_status);
 101        }
 102
 103        /*
 104         * Table disassembly:
 105         * operation_region not found. Generate an External for it, and
 106         * insert the name into the namespace.
 107         */
 108        acpi_dm_add_op_to_external_list(op, path, ACPI_TYPE_REGION, 0, 0);
 109
 110        status = acpi_ns_lookup(walk_state->scope_info, path, ACPI_TYPE_REGION,
 111                                ACPI_IMODE_LOAD_PASS1, ACPI_NS_SEARCH_PARENT,
 112                                walk_state, node);
 113        if (ACPI_FAILURE(status)) {
 114                return (status);
 115        }
 116
 117        /* Must create and install a region object for the new node */
 118
 119        obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_REGION);
 120        if (!obj_desc) {
 121                return (AE_NO_MEMORY);
 122        }
 123
 124        obj_desc->region.node = *node;
 125        status = acpi_ns_attach_object(*node, obj_desc, ACPI_TYPE_REGION);
 126        return (status);
 127}
 128#endif
 129
 130/*******************************************************************************
 131 *
 132 * FUNCTION:    acpi_ds_create_buffer_field
 133 *
 134 * PARAMETERS:  op                  - Current parse op (create_XXField)
 135 *              walk_state          - Current state
 136 *
 137 * RETURN:      Status
 138 *
 139 * DESCRIPTION: Execute the create_field operators:
 140 *              create_bit_field_op,
 141 *              create_byte_field_op,
 142 *              create_word_field_op,
 143 *              create_dword_field_op,
 144 *              create_qword_field_op,
 145 *              create_field_op     (all of which define a field in a buffer)
 146 *
 147 ******************************************************************************/
 148
 149acpi_status
 150acpi_ds_create_buffer_field(union acpi_parse_object *op,
 151                            struct acpi_walk_state *walk_state)
 152{
 153        union acpi_parse_object *arg;
 154        struct acpi_namespace_node *node;
 155        acpi_status status;
 156        union acpi_operand_object *obj_desc;
 157        union acpi_operand_object *second_desc = NULL;
 158        u32 flags;
 159
 160        ACPI_FUNCTION_TRACE(ds_create_buffer_field);
 161
 162        /*
 163         * Get the name_string argument (name of the new buffer_field)
 164         */
 165        if (op->common.aml_opcode == AML_CREATE_FIELD_OP) {
 166
 167                /* For create_field, name is the 4th argument */
 168
 169                arg = acpi_ps_get_arg(op, 3);
 170        } else {
 171                /* For all other create_XXXField operators, name is the 3rd argument */
 172
 173                arg = acpi_ps_get_arg(op, 2);
 174        }
 175
 176        if (!arg) {
 177                return_ACPI_STATUS(AE_AML_NO_OPERAND);
 178        }
 179
 180        if (walk_state->deferred_node) {
 181                node = walk_state->deferred_node;
 182                status = AE_OK;
 183        } else {
 184                /* Execute flag should always be set when this function is entered */
 185
 186                if (!(walk_state->parse_flags & ACPI_PARSE_EXECUTE)) {
 187                        return_ACPI_STATUS(AE_AML_INTERNAL);
 188                }
 189
 190                /* Creating new namespace node, should not already exist */
 191
 192                flags = ACPI_NS_NO_UPSEARCH | ACPI_NS_DONT_OPEN_SCOPE |
 193                    ACPI_NS_ERROR_IF_FOUND;
 194
 195                /*
 196                 * Mark node temporary if we are executing a normal control
 197                 * method. (Don't mark if this is a module-level code method)
 198                 */
 199                if (walk_state->method_node &&
 200                    !(walk_state->parse_flags & ACPI_PARSE_MODULE_LEVEL)) {
 201                        flags |= ACPI_NS_TEMPORARY;
 202                }
 203
 204                /* Enter the name_string into the namespace */
 205
 206                status = acpi_ns_lookup(walk_state->scope_info,
 207                                        arg->common.value.string, ACPI_TYPE_ANY,
 208                                        ACPI_IMODE_LOAD_PASS1, flags,
 209                                        walk_state, &node);
 210                if (ACPI_FAILURE(status)) {
 211                        ACPI_ERROR_NAMESPACE(arg->common.value.string, status);
 212                        return_ACPI_STATUS(status);
 213                }
 214        }
 215
 216        /*
 217         * We could put the returned object (Node) on the object stack for later,
 218         * but for now, we will put it in the "op" object that the parser uses,
 219         * so we can get it again at the end of this scope.
 220         */
 221        op->common.node = node;
 222
 223        /*
 224         * If there is no object attached to the node, this node was just created
 225         * and we need to create the field object. Otherwise, this was a lookup
 226         * of an existing node and we don't want to create the field object again.
 227         */
 228        obj_desc = acpi_ns_get_attached_object(node);
 229        if (obj_desc) {
 230                return_ACPI_STATUS(AE_OK);
 231        }
 232
 233        /*
 234         * The Field definition is not fully parsed at this time.
 235         * (We must save the address of the AML for the buffer and index operands)
 236         */
 237
 238        /* Create the buffer field object */
 239
 240        obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_BUFFER_FIELD);
 241        if (!obj_desc) {
 242                status = AE_NO_MEMORY;
 243                goto cleanup;
 244        }
 245
 246        /*
 247         * Remember location in AML stream of the field unit opcode and operands
 248         * -- since the buffer and index operands must be evaluated.
 249         */
 250        second_desc = obj_desc->common.next_object;
 251        second_desc->extra.aml_start = op->named.data;
 252        second_desc->extra.aml_length = op->named.length;
 253        obj_desc->buffer_field.node = node;
 254
 255        /* Attach constructed field descriptors to parent node */
 256
 257        status = acpi_ns_attach_object(node, obj_desc, ACPI_TYPE_BUFFER_FIELD);
 258        if (ACPI_FAILURE(status)) {
 259                goto cleanup;
 260        }
 261
 262cleanup:
 263
 264        /* Remove local reference to the object */
 265
 266        acpi_ut_remove_reference(obj_desc);
 267        return_ACPI_STATUS(status);
 268}
 269
 270/*******************************************************************************
 271 *
 272 * FUNCTION:    acpi_ds_get_field_names
 273 *
 274 * PARAMETERS:  info            - create_field info structure
 275 *  `           walk_state      - Current method state
 276 *              arg             - First parser arg for the field name list
 277 *
 278 * RETURN:      Status
 279 *
 280 * DESCRIPTION: Process all named fields in a field declaration. Names are
 281 *              entered into the namespace.
 282 *
 283 ******************************************************************************/
 284
 285static acpi_status
 286acpi_ds_get_field_names(struct acpi_create_field_info *info,
 287                        struct acpi_walk_state *walk_state,
 288                        union acpi_parse_object *arg)
 289{
 290        acpi_status status;
 291        u64 position;
 292        union acpi_parse_object *child;
 293
 294        ACPI_FUNCTION_TRACE_PTR(ds_get_field_names, info);
 295
 296        /* First field starts at bit zero */
 297
 298        info->field_bit_position = 0;
 299
 300        /* Process all elements in the field list (of parse nodes) */
 301
 302        while (arg) {
 303                /*
 304                 * Four types of field elements are handled:
 305                 * 1) name - Enters a new named field into the namespace
 306                 * 2) offset - specifies a bit offset
 307                 * 3) access_as - changes the access mode/attributes
 308                 * 4) connection - Associate a resource template with the field
 309                 */
 310                switch (arg->common.aml_opcode) {
 311                case AML_INT_RESERVEDFIELD_OP:
 312
 313                        position = (u64)info->field_bit_position +
 314                            (u64)arg->common.value.size;
 315
 316                        if (position > ACPI_UINT32_MAX) {
 317                                ACPI_ERROR((AE_INFO,
 318                                            "Bit offset within field too large (> 0xFFFFFFFF)"));
 319                                return_ACPI_STATUS(AE_SUPPORT);
 320                        }
 321
 322                        info->field_bit_position = (u32) position;
 323                        break;
 324
 325                case AML_INT_ACCESSFIELD_OP:
 326                case AML_INT_EXTACCESSFIELD_OP:
 327                        /*
 328                         * Get new access_type, access_attribute, and access_length fields
 329                         * -- to be used for all field units that follow, until the
 330                         * end-of-field or another access_as keyword is encountered.
 331                         * NOTE. These three bytes are encoded in the integer value
 332                         * of the parseop for convenience.
 333                         *
 334                         * In field_flags, preserve the flag bits other than the
 335                         * ACCESS_TYPE bits.
 336                         */
 337
 338                        /* access_type (byte_acc, word_acc, etc.) */
 339
 340                        info->field_flags = (u8)
 341                            ((info->
 342                              field_flags & ~(AML_FIELD_ACCESS_TYPE_MASK)) |
 343                             ((u8)((u32)(arg->common.value.integer & 0x07))));
 344
 345                        /* access_attribute (attrib_quick, attrib_byte, etc.) */
 346
 347                        info->attribute = (u8)
 348                            ((arg->common.value.integer >> 8) & 0xFF);
 349
 350                        /* access_length (for serial/buffer protocols) */
 351
 352                        info->access_length = (u8)
 353                            ((arg->common.value.integer >> 16) & 0xFF);
 354                        break;
 355
 356                case AML_INT_CONNECTION_OP:
 357                        /*
 358                         * Clear any previous connection. New connection is used for all
 359                         * fields that follow, similar to access_as
 360                         */
 361                        info->resource_buffer = NULL;
 362                        info->connection_node = NULL;
 363                        info->pin_number_index = 0;
 364
 365                        /*
 366                         * A Connection() is either an actual resource descriptor (buffer)
 367                         * or a named reference to a resource template
 368                         */
 369                        child = arg->common.value.arg;
 370                        if (child->common.aml_opcode == AML_INT_BYTELIST_OP) {
 371                                info->resource_buffer = child->named.data;
 372                                info->resource_length =
 373                                    (u16)child->named.value.integer;
 374                        } else {
 375                                /* Lookup the Connection() namepath, it should already exist */
 376
 377                                status = acpi_ns_lookup(walk_state->scope_info,
 378                                                        child->common.value.
 379                                                        name, ACPI_TYPE_ANY,
 380                                                        ACPI_IMODE_EXECUTE,
 381                                                        ACPI_NS_DONT_OPEN_SCOPE,
 382                                                        walk_state,
 383                                                        &info->connection_node);
 384                                if (ACPI_FAILURE(status)) {
 385                                        ACPI_ERROR_NAMESPACE(child->common.
 386                                                             value.name,
 387                                                             status);
 388                                        return_ACPI_STATUS(status);
 389                                }
 390                        }
 391                        break;
 392
 393                case AML_INT_NAMEDFIELD_OP:
 394
 395                        /* Lookup the name, it should already exist */
 396
 397                        status = acpi_ns_lookup(walk_state->scope_info,
 398                                                (char *)&arg->named.name,
 399                                                info->field_type,
 400                                                ACPI_IMODE_EXECUTE,
 401                                                ACPI_NS_DONT_OPEN_SCOPE,
 402                                                walk_state, &info->field_node);
 403                        if (ACPI_FAILURE(status)) {
 404                                ACPI_ERROR_NAMESPACE((char *)&arg->named.name,
 405                                                     status);
 406                                return_ACPI_STATUS(status);
 407                        } else {
 408                                arg->common.node = info->field_node;
 409                                info->field_bit_length = arg->common.value.size;
 410
 411                                /*
 412                                 * If there is no object attached to the node, this node was
 413                                 * just created and we need to create the field object.
 414                                 * Otherwise, this was a lookup of an existing node and we
 415                                 * don't want to create the field object again.
 416                                 */
 417                                if (!acpi_ns_get_attached_object
 418                                    (info->field_node)) {
 419                                        status = acpi_ex_prep_field_value(info);
 420                                        if (ACPI_FAILURE(status)) {
 421                                                return_ACPI_STATUS(status);
 422                                        }
 423                                }
 424                        }
 425
 426                        /* Keep track of bit position for the next field */
 427
 428                        position = (u64)info->field_bit_position +
 429                            (u64)arg->common.value.size;
 430
 431                        if (position > ACPI_UINT32_MAX) {
 432                                ACPI_ERROR((AE_INFO,
 433                                            "Field [%4.4s] bit offset too large (> 0xFFFFFFFF)",
 434                                            ACPI_CAST_PTR(char,
 435                                                          &info->field_node->
 436                                                          name)));
 437                                return_ACPI_STATUS(AE_SUPPORT);
 438                        }
 439
 440                        info->field_bit_position += info->field_bit_length;
 441                        info->pin_number_index++;       /* Index relative to previous Connection() */
 442                        break;
 443
 444                default:
 445
 446                        ACPI_ERROR((AE_INFO,
 447                                    "Invalid opcode in field list: 0x%X",
 448                                    arg->common.aml_opcode));
 449                        return_ACPI_STATUS(AE_AML_BAD_OPCODE);
 450                }
 451
 452                arg = arg->common.next;
 453        }
 454
 455        return_ACPI_STATUS(AE_OK);
 456}
 457
 458/*******************************************************************************
 459 *
 460 * FUNCTION:    acpi_ds_create_field
 461 *
 462 * PARAMETERS:  op              - Op containing the Field definition and args
 463 *              region_node     - Object for the containing Operation Region
 464 *  `           walk_state      - Current method state
 465 *
 466 * RETURN:      Status
 467 *
 468 * DESCRIPTION: Create a new field in the specified operation region
 469 *
 470 ******************************************************************************/
 471
 472acpi_status
 473acpi_ds_create_field(union acpi_parse_object *op,
 474                     struct acpi_namespace_node *region_node,
 475                     struct acpi_walk_state *walk_state)
 476{
 477        acpi_status status;
 478        union acpi_parse_object *arg;
 479        struct acpi_create_field_info info;
 480
 481        ACPI_FUNCTION_TRACE_PTR(ds_create_field, op);
 482
 483        /* First arg is the name of the parent op_region (must already exist) */
 484
 485        arg = op->common.value.arg;
 486
 487        if (!region_node) {
 488                status =
 489                    acpi_ns_lookup(walk_state->scope_info,
 490                                   arg->common.value.name, ACPI_TYPE_REGION,
 491                                   ACPI_IMODE_EXECUTE, ACPI_NS_SEARCH_PARENT,
 492                                   walk_state, &region_node);
 493#ifdef ACPI_ASL_COMPILER
 494                status = acpi_ds_create_external_region(status, arg,
 495                                                        arg->common.value.name,
 496                                                        walk_state,
 497                                                        &region_node);
 498#endif
 499                if (ACPI_FAILURE(status)) {
 500                        ACPI_ERROR_NAMESPACE(arg->common.value.name, status);
 501                        return_ACPI_STATUS(status);
 502                }
 503        }
 504
 505        memset(&info, 0, sizeof(struct acpi_create_field_info));
 506
 507        /* Second arg is the field flags */
 508
 509        arg = arg->common.next;
 510        info.field_flags = (u8) arg->common.value.integer;
 511        info.attribute = 0;
 512
 513        /* Each remaining arg is a Named Field */
 514
 515        info.field_type = ACPI_TYPE_LOCAL_REGION_FIELD;
 516        info.region_node = region_node;
 517
 518        status = acpi_ds_get_field_names(&info, walk_state, arg->common.next);
 519        return_ACPI_STATUS(status);
 520}
 521
 522/*******************************************************************************
 523 *
 524 * FUNCTION:    acpi_ds_init_field_objects
 525 *
 526 * PARAMETERS:  op              - Op containing the Field definition and args
 527 *  `           walk_state      - Current method state
 528 *
 529 * RETURN:      Status
 530 *
 531 * DESCRIPTION: For each "Field Unit" name in the argument list that is
 532 *              part of the field declaration, enter the name into the
 533 *              namespace.
 534 *
 535 ******************************************************************************/
 536
 537acpi_status
 538acpi_ds_init_field_objects(union acpi_parse_object *op,
 539                           struct acpi_walk_state *walk_state)
 540{
 541        acpi_status status;
 542        union acpi_parse_object *arg = NULL;
 543        struct acpi_namespace_node *node;
 544        u8 type = 0;
 545        u32 flags;
 546
 547        ACPI_FUNCTION_TRACE_PTR(ds_init_field_objects, op);
 548
 549        /* Execute flag should always be set when this function is entered */
 550
 551        if (!(walk_state->parse_flags & ACPI_PARSE_EXECUTE)) {
 552                if (walk_state->parse_flags & ACPI_PARSE_DEFERRED_OP) {
 553
 554                        /* bank_field Op is deferred, just return OK */
 555
 556                        return_ACPI_STATUS(AE_OK);
 557                }
 558
 559                return_ACPI_STATUS(AE_AML_INTERNAL);
 560        }
 561
 562        /*
 563         * Get the field_list argument for this opcode. This is the start of the
 564         * list of field elements.
 565         */
 566        switch (walk_state->opcode) {
 567        case AML_FIELD_OP:
 568
 569                arg = acpi_ps_get_arg(op, 2);
 570                type = ACPI_TYPE_LOCAL_REGION_FIELD;
 571                break;
 572
 573        case AML_BANK_FIELD_OP:
 574
 575                arg = acpi_ps_get_arg(op, 4);
 576                type = ACPI_TYPE_LOCAL_BANK_FIELD;
 577                break;
 578
 579        case AML_INDEX_FIELD_OP:
 580
 581                arg = acpi_ps_get_arg(op, 3);
 582                type = ACPI_TYPE_LOCAL_INDEX_FIELD;
 583                break;
 584
 585        default:
 586
 587                return_ACPI_STATUS(AE_BAD_PARAMETER);
 588        }
 589
 590        /* Creating new namespace node(s), should not already exist */
 591
 592        flags = ACPI_NS_NO_UPSEARCH | ACPI_NS_DONT_OPEN_SCOPE |
 593            ACPI_NS_ERROR_IF_FOUND;
 594
 595        /*
 596         * Mark node(s) temporary if we are executing a normal control
 597         * method. (Don't mark if this is a module-level code method)
 598         */
 599        if (walk_state->method_node &&
 600            !(walk_state->parse_flags & ACPI_PARSE_MODULE_LEVEL)) {
 601                flags |= ACPI_NS_TEMPORARY;
 602        }
 603
 604        /*
 605         * Walk the list of entries in the field_list
 606         * Note: field_list can be of zero length. In this case, Arg will be NULL.
 607         */
 608        while (arg) {
 609                /*
 610                 * Ignore OFFSET/ACCESSAS/CONNECTION terms here; we are only interested
 611                 * in the field names in order to enter them into the namespace.
 612                 */
 613                if (arg->common.aml_opcode == AML_INT_NAMEDFIELD_OP) {
 614                        status = acpi_ns_lookup(walk_state->scope_info,
 615                                                (char *)&arg->named.name, type,
 616                                                ACPI_IMODE_LOAD_PASS1, flags,
 617                                                walk_state, &node);
 618                        if (ACPI_FAILURE(status)) {
 619                                ACPI_ERROR_NAMESPACE((char *)&arg->named.name,
 620                                                     status);
 621                                if (status != AE_ALREADY_EXISTS) {
 622                                        return_ACPI_STATUS(status);
 623                                }
 624
 625                                /* Name already exists, just ignore this error */
 626
 627                                status = AE_OK;
 628                        }
 629
 630                        arg->common.node = node;
 631                }
 632
 633                /* Get the next field element in the list */
 634
 635                arg = arg->common.next;
 636        }
 637
 638        return_ACPI_STATUS(AE_OK);
 639}
 640
 641/*******************************************************************************
 642 *
 643 * FUNCTION:    acpi_ds_create_bank_field
 644 *
 645 * PARAMETERS:  op              - Op containing the Field definition and args
 646 *              region_node     - Object for the containing Operation Region
 647 *              walk_state      - Current method state
 648 *
 649 * RETURN:      Status
 650 *
 651 * DESCRIPTION: Create a new bank field in the specified operation region
 652 *
 653 ******************************************************************************/
 654
 655acpi_status
 656acpi_ds_create_bank_field(union acpi_parse_object *op,
 657                          struct acpi_namespace_node *region_node,
 658                          struct acpi_walk_state *walk_state)
 659{
 660        acpi_status status;
 661        union acpi_parse_object *arg;
 662        struct acpi_create_field_info info;
 663
 664        ACPI_FUNCTION_TRACE_PTR(ds_create_bank_field, op);
 665
 666        /* First arg is the name of the parent op_region (must already exist) */
 667
 668        arg = op->common.value.arg;
 669        if (!region_node) {
 670                status =
 671                    acpi_ns_lookup(walk_state->scope_info,
 672                                   arg->common.value.name, ACPI_TYPE_REGION,
 673                                   ACPI_IMODE_EXECUTE, ACPI_NS_SEARCH_PARENT,
 674                                   walk_state, &region_node);
 675#ifdef ACPI_ASL_COMPILER
 676                status = acpi_ds_create_external_region(status, arg,
 677                                                        arg->common.value.name,
 678                                                        walk_state,
 679                                                        &region_node);
 680#endif
 681                if (ACPI_FAILURE(status)) {
 682                        ACPI_ERROR_NAMESPACE(arg->common.value.name, status);
 683                        return_ACPI_STATUS(status);
 684                }
 685        }
 686
 687        /* Second arg is the Bank Register (Field) (must already exist) */
 688
 689        arg = arg->common.next;
 690        status =
 691            acpi_ns_lookup(walk_state->scope_info, arg->common.value.string,
 692                           ACPI_TYPE_ANY, ACPI_IMODE_EXECUTE,
 693                           ACPI_NS_SEARCH_PARENT, walk_state,
 694                           &info.register_node);
 695        if (ACPI_FAILURE(status)) {
 696                ACPI_ERROR_NAMESPACE(arg->common.value.string, status);
 697                return_ACPI_STATUS(status);
 698        }
 699
 700        /*
 701         * Third arg is the bank_value
 702         * This arg is a term_arg, not a constant
 703         * It will be evaluated later, by acpi_ds_eval_bank_field_operands
 704         */
 705        arg = arg->common.next;
 706
 707        /* Fourth arg is the field flags */
 708
 709        arg = arg->common.next;
 710        info.field_flags = (u8) arg->common.value.integer;
 711
 712        /* Each remaining arg is a Named Field */
 713
 714        info.field_type = ACPI_TYPE_LOCAL_BANK_FIELD;
 715        info.region_node = region_node;
 716
 717        /*
 718         * Use Info.data_register_node to store bank_field Op
 719         * It's safe because data_register_node will never be used when create
 720         * bank field \we store aml_start and aml_length in the bank_field Op for
 721         * late evaluation. Used in acpi_ex_prep_field_value(Info)
 722         *
 723         * TBD: Or, should we add a field in struct acpi_create_field_info, like
 724         * "void *ParentOp"?
 725         */
 726        info.data_register_node = (struct acpi_namespace_node *)op;
 727
 728        status = acpi_ds_get_field_names(&info, walk_state, arg->common.next);
 729        return_ACPI_STATUS(status);
 730}
 731
 732/*******************************************************************************
 733 *
 734 * FUNCTION:    acpi_ds_create_index_field
 735 *
 736 * PARAMETERS:  op              - Op containing the Field definition and args
 737 *              region_node     - Object for the containing Operation Region
 738 *  `           walk_state      - Current method state
 739 *
 740 * RETURN:      Status
 741 *
 742 * DESCRIPTION: Create a new index field in the specified operation region
 743 *
 744 ******************************************************************************/
 745
 746acpi_status
 747acpi_ds_create_index_field(union acpi_parse_object *op,
 748                           struct acpi_namespace_node *region_node,
 749                           struct acpi_walk_state *walk_state)
 750{
 751        acpi_status status;
 752        union acpi_parse_object *arg;
 753        struct acpi_create_field_info info;
 754
 755        ACPI_FUNCTION_TRACE_PTR(ds_create_index_field, op);
 756
 757        /* First arg is the name of the Index register (must already exist) */
 758
 759        arg = op->common.value.arg;
 760        status =
 761            acpi_ns_lookup(walk_state->scope_info, arg->common.value.string,
 762                           ACPI_TYPE_ANY, ACPI_IMODE_EXECUTE,
 763                           ACPI_NS_SEARCH_PARENT, walk_state,
 764                           &info.register_node);
 765        if (ACPI_FAILURE(status)) {
 766                ACPI_ERROR_NAMESPACE(arg->common.value.string, status);
 767                return_ACPI_STATUS(status);
 768        }
 769
 770        /* Second arg is the data register (must already exist) */
 771
 772        arg = arg->common.next;
 773        status =
 774            acpi_ns_lookup(walk_state->scope_info, arg->common.value.string,
 775                           ACPI_TYPE_ANY, ACPI_IMODE_EXECUTE,
 776                           ACPI_NS_SEARCH_PARENT, walk_state,
 777                           &info.data_register_node);
 778        if (ACPI_FAILURE(status)) {
 779                ACPI_ERROR_NAMESPACE(arg->common.value.string, status);
 780                return_ACPI_STATUS(status);
 781        }
 782
 783        /* Next arg is the field flags */
 784
 785        arg = arg->common.next;
 786        info.field_flags = (u8) arg->common.value.integer;
 787
 788        /* Each remaining arg is a Named Field */
 789
 790        info.field_type = ACPI_TYPE_LOCAL_INDEX_FIELD;
 791        info.region_node = region_node;
 792
 793        status = acpi_ds_get_field_names(&info, walk_state, arg->common.next);
 794        return_ACPI_STATUS(status);
 795}
 796