drivers/acpi/acpica/exprep.c

   1 /******************************************************************************
   2  *
   3  * Module Name: exprep - ACPI AML field prep utilities
   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 "acinterp.h"
  47 #include "amlcode.h"
  48 #include "acnamesp.h"
  49 #include "acdispat.h"
  50
  51 #define _COMPONENT          ACPI_EXECUTER
  52 ACPI_MODULE_NAME("exprep")
  53
  54 /* Local prototypes */
  55 static u32
  56 acpi_ex_decode_field_access(union acpi_operand_object *obj_desc,
  57                             u8 field_flags, u32 * return_byte_alignment);
  58
  59 #ifdef ACPI_UNDER_DEVELOPMENT
  60
  61 static u32
  62 acpi_ex_generate_access(u32 field_bit_offset,
  63                         u32 field_bit_length, u32 region_length);
  64
  65 /*******************************************************************************
  66  *
  67  * FUNCTION:    acpi_ex_generate_access
  68  *
  69  * PARAMETERS:  field_bit_offset    - Start of field within parent region/buffer
  70  *              field_bit_length    - Length of field in bits
  71  *              region_length       - Length of parent in bytes
  72  *
  73  * RETURN:      Field granularity (8, 16, 32 or 64) and
  74  *              byte_alignment (1, 2, 3, or 4)
  75  *
  76  * DESCRIPTION: Generate an optimal access width for fields defined with the
  77  *              any_acc keyword.
  78  *
  79  * NOTE: Need to have the region_length in order to check for boundary
  80  *       conditions (end-of-region). However, the region_length is a deferred
  81  *       operation. Therefore, to complete this implementation, the generation
  82  *       of this access width must be deferred until the region length has
  83  *       been evaluated.
  84  *
  85  ******************************************************************************/
  86
  87 static u32
  88 acpi_ex_generate_access(u32 field_bit_offset,
  89                         u32 field_bit_length, u32 region_length)
  90 {
  91         u32 field_byte_length;
  92         u32 field_byte_offset;
  93         u32 field_byte_end_offset;
  94         u32 access_byte_width;
  95         u32 field_start_offset;
  96         u32 field_end_offset;
  97         u32 minimum_access_width = 0xFFFFFFFF;
  98         u32 minimum_accesses = 0xFFFFFFFF;
  99         u32 accesses;
 100
 101         ACPI_FUNCTION_TRACE(ex_generate_access);
 102
 103         /* Round Field start offset and length to "minimal" byte boundaries */
 104
 105         field_byte_offset = ACPI_DIV_8(ACPI_ROUND_DOWN(field_bit_offset, 8));
 106
 107         field_byte_end_offset =
 108             ACPI_DIV_8(ACPI_ROUND_UP(field_bit_length + field_bit_offset, 8));
 109
 110         field_byte_length = field_byte_end_offset - field_byte_offset;
 111
 112         ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
 113                           "Bit length %u, Bit offset %u\n",
 114                           field_bit_length, field_bit_offset));
 115
 116         ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
 117                           "Byte Length %u, Byte Offset %u, End Offset %u\n",
 118                           field_byte_length, field_byte_offset,
 119                           field_byte_end_offset));
 120
 121         /*
 122          * Iterative search for the maximum access width that is both aligned
 123          * and does not go beyond the end of the region
 124          *
 125          * Start at byte_acc and work upwards to qword_acc max. (1,2,4,8 bytes)
 126          */
 127         for (access_byte_width = 1; access_byte_width <= 8;
 128              access_byte_width <<= 1) {
 129                 /*
 130                  * 1) Round end offset up to next access boundary and make sure that
 131                  *    this does not go beyond the end of the parent region.
 132                  * 2) When the Access width is greater than the field_byte_length, we
 133                  *    are done. (This does not optimize for the perfectly aligned
 134                  *    case yet).
 135                  */
 136                 if (ACPI_ROUND_UP(field_byte_end_offset, access_byte_width) <=
 137                     region_length) {
 138                         field_start_offset =
 139                             ACPI_ROUND_DOWN(field_byte_offset,
 140                                             access_byte_width) /
 141                             access_byte_width;
 142
 143                         field_end_offset =
 144                             ACPI_ROUND_UP((field_byte_length +
 145                                            field_byte_offset),
 146                                           access_byte_width) /
 147                             access_byte_width;
 148
 149                         accesses = field_end_offset - field_start_offset;
 150
 151                         ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
 152                                           "AccessWidth %u end is within region\n",
 153                                           access_byte_width));
 154
 155                         ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
 156                                           "Field Start %u, Field End %u -- requires %u accesses\n",
 157                                           field_start_offset, field_end_offset,
 158                                           accesses));
 159
 160                         /* Single access is optimal */
 161
 162                         if (accesses <= 1) {
 163                                 ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
 164                                                   "Entire field can be accessed "
 165                                                   "with one operation of size %u\n",
 166                                                   access_byte_width));
 167                                 return_VALUE(access_byte_width);
 168                         }
 169
 170                         /*
 171                          * Fits in the region, but requires more than one read/write.
 172                          * try the next wider access on next iteration
 173                          */
 174                         if (accesses < minimum_accesses) {
 175                                 minimum_accesses = accesses;
 176                                 minimum_access_width = access_byte_width;
 177                         }
 178                 } else {
 179                         ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
 180                                           "AccessWidth %u end is NOT within region\n",
 181                                           access_byte_width));
 182                         if (access_byte_width == 1) {
 183                                 ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
 184                                                   "Field goes beyond end-of-region!\n"));
 185
 186                                 /* Field does not fit in the region at all */
 187
 188                                 return_VALUE(0);
 189                         }
 190
 191                         /*
 192                          * This width goes beyond the end-of-region, back off to
 193                          * previous access
 194                          */
 195                         ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
 196                                           "Backing off to previous optimal access width of %u\n",
 197                                           minimum_access_width));
 198                         return_VALUE(minimum_access_width);
 199                 }
 200         }
 201
 202         /*
 203          * Could not read/write field with one operation,
 204          * just use max access width
 205          */
 206         ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
 207                           "Cannot access field in one operation, using width 8\n"));
 208
 209         return_VALUE(8);
 210 }
 211 #endif                          /* ACPI_UNDER_DEVELOPMENT */
 212
 213 /*******************************************************************************
 214  *
 215  * FUNCTION:    acpi_ex_decode_field_access
 216  *
 217  * PARAMETERS:  obj_desc            - Field object
 218  *              field_flags         - Encoded fieldflags (contains access bits)
 219  *              return_byte_alignment - Where the byte alignment is returned
 220  *
 221  * RETURN:      Field granularity (8, 16, 32 or 64) and
 222  *              byte_alignment (1, 2, 3, or 4)
 223  *
 224  * DESCRIPTION: Decode the access_type bits of a field definition.
 225  *
 226  ******************************************************************************/
 227
 228 static u32
 229 acpi_ex_decode_field_access(union acpi_operand_object *obj_desc,
 230                             u8 field_flags, u32 * return_byte_alignment)
 231 {
 232         u32 access;
 233         u32 byte_alignment;
 234         u32 bit_length;
 235
 236         ACPI_FUNCTION_TRACE(ex_decode_field_access);
 237
 238         access = (field_flags & AML_FIELD_ACCESS_TYPE_MASK);
 239
 240         switch (access) {
 241         case AML_FIELD_ACCESS_ANY:
 242
 243 #ifdef ACPI_UNDER_DEVELOPMENT
 244                 byte_alignment =
 245                     acpi_ex_generate_access(obj_desc->common_field.
 246                                             start_field_bit_offset,
 247                                             obj_desc->common_field.bit_length,
 248                                             0xFFFFFFFF
 249                                             /* Temp until we pass region_length as parameter */
 250                     );
 251                 bit_length = byte_alignment * 8;
 252 #endif
 253
 254                 byte_alignment = 1;
 255                 bit_length = 8;
 256                 break;
 257
 258         case AML_FIELD_ACCESS_BYTE:
 259         case AML_FIELD_ACCESS_BUFFER:   /* ACPI 2.0 (SMBus Buffer) */
 260
 261                 byte_alignment = 1;
 262                 bit_length = 8;
 263                 break;
 264
 265         case AML_FIELD_ACCESS_WORD:
 266
 267                 byte_alignment = 2;
 268                 bit_length = 16;
 269                 break;
 270
 271         case AML_FIELD_ACCESS_DWORD:
 272
 273                 byte_alignment = 4;
 274                 bit_length = 32;
 275                 break;
 276
 277         case AML_FIELD_ACCESS_QWORD:    /* ACPI 2.0 */
 278
 279                 byte_alignment = 8;
 280                 bit_length = 64;
 281                 break;
 282
 283         default:
 284
 285                 /* Invalid field access type */
 286
 287                 ACPI_ERROR((AE_INFO, "Unknown field access type 0x%X", access));
 288
 289                 return_UINT32(0);
 290         }
 291
 292         if (obj_desc->common.type == ACPI_TYPE_BUFFER_FIELD) {
 293                 /*
 294                  * buffer_field access can be on any byte boundary, so the
 295                  * byte_alignment is always 1 byte -- regardless of any byte_alignment
 296                  * implied by the field access type.
 297                  */
 298                 byte_alignment = 1;
 299         }
 300
 301         *return_byte_alignment = byte_alignment;
 302         return_UINT32(bit_length);
 303 }
 304
 305 /*******************************************************************************
 306  *
 307  * FUNCTION:    acpi_ex_prep_common_field_object
 308  *
 309  * PARAMETERS:  obj_desc            - The field object
 310  *              field_flags         - Access, lock_rule, and update_rule.
 311  *                                    The format of a field_flag is described
 312  *                                    in the ACPI specification
 313  *              field_attribute     - Special attributes (not used)
 314  *              field_bit_position  - Field start position
 315  *              field_bit_length    - Field length in number of bits
 316  *
 317  * RETURN:      Status
 318  *
 319  * DESCRIPTION: Initialize the areas of the field object that are common
 320  *              to the various types of fields. Note: This is very "sensitive"
 321  *              code because we are solving the general case for field
 322  *              alignment.
 323  *
 324  ******************************************************************************/
 325
 326 acpi_status
 327 acpi_ex_prep_common_field_object(union acpi_operand_object *obj_desc,
 328                                  u8 field_flags,
 329                                  u8 field_attribute,
 330                                  u32 field_bit_position, u32 field_bit_length)
 331 {
 332         u32 access_bit_width;
 333         u32 byte_alignment;
 334         u32 nearest_byte_address;
 335
 336         ACPI_FUNCTION_TRACE(ex_prep_common_field_object);
 337
 338         /*
 339          * Note: the structure being initialized is the
 340          * ACPI_COMMON_FIELD_INFO;  No structure fields outside of the common
 341          * area are initialized by this procedure.
 342          */
 343         obj_desc->common_field.field_flags = field_flags;
 344         obj_desc->common_field.attribute = field_attribute;
 345         obj_desc->common_field.bit_length = field_bit_length;
 346
 347         /*
 348          * Decode the access type so we can compute offsets. The access type gives
 349          * two pieces of information - the width of each field access and the
 350          * necessary byte_alignment (address granularity) of the access.
 351          *
 352          * For any_acc, the access_bit_width is the largest width that is both
 353          * necessary and possible in an attempt to access the whole field in one
 354          * I/O operation. However, for any_acc, the byte_alignment is always one
 355          * byte.
 356          *
 357          * For all Buffer Fields, the byte_alignment is always one byte.
 358          *
 359          * For all other access types (Byte, Word, Dword, Qword), the Bitwidth is
 360          * the same (equivalent) as the byte_alignment.
 361          */
 362         access_bit_width =
 363             acpi_ex_decode_field_access(obj_desc, field_flags, &byte_alignment);
 364         if (!access_bit_width) {
 365                 return_ACPI_STATUS(AE_AML_OPERAND_VALUE);
 366         }
 367
 368         /* Setup width (access granularity) fields (values are: 1, 2, 4, 8) */
 369
 370         obj_desc->common_field.access_byte_width = (u8)
 371             ACPI_DIV_8(access_bit_width);
 372
 373         /*
 374          * base_byte_offset is the address of the start of the field within the
 375          * region. It is the byte address of the first *datum* (field-width data
 376          * unit) of the field. (i.e., the first datum that contains at least the
 377          * first *bit* of the field.)
 378          *
 379          * Note: byte_alignment is always either equal to the access_bit_width or 8
 380          * (Byte access), and it defines the addressing granularity of the parent
 381          * region or buffer.
 382          */
 383         nearest_byte_address =
 384             ACPI_ROUND_BITS_DOWN_TO_BYTES(field_bit_position);
 385         obj_desc->common_field.base_byte_offset = (u32)
 386             ACPI_ROUND_DOWN(nearest_byte_address, byte_alignment);
 387
 388         /*
 389          * start_field_bit_offset is the offset of the first bit of the field within
 390          * a field datum.
 391          */
 392         obj_desc->common_field.start_field_bit_offset = (u8)
 393             (field_bit_position -
 394              ACPI_MUL_8(obj_desc->common_field.base_byte_offset));
 395
 396         return_ACPI_STATUS(AE_OK);
 397 }
 398
 399 /*******************************************************************************
 400  *
 401  * FUNCTION:    acpi_ex_prep_field_value
 402  *
 403  * PARAMETERS:  info    - Contains all field creation info
 404  *
 405  * RETURN:      Status
 406  *
 407  * DESCRIPTION: Construct an object of type union acpi_operand_object with a
 408  *              subtype of def_field and connect it to the parent Node.
 409  *
 410  ******************************************************************************/
 411
 412 acpi_status acpi_ex_prep_field_value(struct acpi_create_field_info *info)
 413 {
 414         union acpi_operand_object *obj_desc;
 415         union acpi_operand_object *second_desc = NULL;
 416         acpi_status status;
 417         u32 access_byte_width;
 418         u32 type;
 419
 420         ACPI_FUNCTION_TRACE(ex_prep_field_value);
 421
 422         /* Parameter validation */
 423
 424         if (info->field_type != ACPI_TYPE_LOCAL_INDEX_FIELD) {
 425                 if (!info->region_node) {
 426                         ACPI_ERROR((AE_INFO, "Null RegionNode"));
 427                         return_ACPI_STATUS(AE_AML_NO_OPERAND);
 428                 }
 429
 430                 type = acpi_ns_get_type(info->region_node);
 431                 if (type != ACPI_TYPE_REGION) {
 432                         ACPI_ERROR((AE_INFO,
 433                                     "Needed Region, found type 0x%X (%s)", type,
 434                                     acpi_ut_get_type_name(type)));
 435
 436                         return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 437                 }
 438         }
 439
 440         /* Allocate a new field object */
 441
 442         obj_desc = acpi_ut_create_internal_object(info->field_type);
 443         if (!obj_desc) {
 444                 return_ACPI_STATUS(AE_NO_MEMORY);
 445         }
 446
 447         /* Initialize areas of the object that are common to all fields */
 448
 449         obj_desc->common_field.node = info->field_node;
 450         status = acpi_ex_prep_common_field_object(obj_desc,
 451                                                   info->field_flags,
 452                                                   info->attribute,
 453                                                   info->field_bit_position,
 454                                                   info->field_bit_length);
 455         if (ACPI_FAILURE(status)) {
 456                 acpi_ut_delete_object_desc(obj_desc);
 457                 return_ACPI_STATUS(status);
 458         }
 459
 460         /* Initialize areas of the object that are specific to the field type */
 461
 462         switch (info->field_type) {
 463         case ACPI_TYPE_LOCAL_REGION_FIELD:
 464
 465                 obj_desc->field.region_obj =
 466                     acpi_ns_get_attached_object(info->region_node);
 467
 468                 /* Fields specific to generic_serial_bus fields */
 469
 470                 obj_desc->field.access_length = info->access_length;
 471
 472                 if (info->connection_node) {
 473                         second_desc = info->connection_node->object;
 474                         if (!(second_desc->common.flags & AOPOBJ_DATA_VALID)) {
 475                                 status =
 476                                     acpi_ds_get_buffer_arguments(second_desc);
 477                                 if (ACPI_FAILURE(status)) {
 478                                         acpi_ut_delete_object_desc(obj_desc);
 479                                         return_ACPI_STATUS(status);
 480                                 }
 481                         }
 482
 483                         obj_desc->field.resource_buffer =
 484                             second_desc->buffer.pointer;
 485                         obj_desc->field.resource_length =
 486                             (u16)second_desc->buffer.length;
 487                 } else if (info->resource_buffer) {
 488                         obj_desc->field.resource_buffer = info->resource_buffer;
 489                         obj_desc->field.resource_length = info->resource_length;
 490                 }
 491
 492                 obj_desc->field.pin_number_index = info->pin_number_index;
 493
 494                 /* Allow full data read from EC address space */
 495
 496                 if ((obj_desc->field.region_obj->region.space_id ==
 497                      ACPI_ADR_SPACE_EC)
 498                     && (obj_desc->common_field.bit_length > 8)) {
 499                         access_byte_width =
 500                             ACPI_ROUND_BITS_UP_TO_BYTES(obj_desc->common_field.
 501                                                         bit_length);
 502
 503                         /* Maximum byte width supported is 255 */
 504
 505                         if (access_byte_width < 256) {
 506                                 obj_desc->common_field.access_byte_width =
 507                                     (u8)access_byte_width;
 508                         }
 509                 }
 510                 /* An additional reference for the container */
 511
 512                 acpi_ut_add_reference(obj_desc->field.region_obj);
 513
 514                 ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
 515                                   "RegionField: BitOff %X, Off %X, Gran %X, Region %p\n",
 516                                   obj_desc->field.start_field_bit_offset,
 517                                   obj_desc->field.base_byte_offset,
 518                                   obj_desc->field.access_byte_width,
 519                                   obj_desc->field.region_obj));
 520                 break;
 521
 522         case ACPI_TYPE_LOCAL_BANK_FIELD:
 523
 524                 obj_desc->bank_field.value = info->bank_value;
 525                 obj_desc->bank_field.region_obj =
 526                     acpi_ns_get_attached_object(info->region_node);
 527                 obj_desc->bank_field.bank_obj =
 528                     acpi_ns_get_attached_object(info->register_node);
 529
 530                 /* An additional reference for the attached objects */
 531
 532                 acpi_ut_add_reference(obj_desc->bank_field.region_obj);
 533                 acpi_ut_add_reference(obj_desc->bank_field.bank_obj);
 534
 535                 ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
 536                                   "Bank Field: BitOff %X, Off %X, Gran %X, Region %p, BankReg %p\n",
 537                                   obj_desc->bank_field.start_field_bit_offset,
 538                                   obj_desc->bank_field.base_byte_offset,
 539                                   obj_desc->field.access_byte_width,
 540                                   obj_desc->bank_field.region_obj,
 541                                   obj_desc->bank_field.bank_obj));
 542
 543                 /*
 544                  * Remember location in AML stream of the field unit
 545                  * opcode and operands -- since the bank_value
 546                  * operands must be evaluated.
 547                  */
 548                 second_desc = obj_desc->common.next_object;
 549                 second_desc->extra.aml_start =
 550                     ACPI_CAST_PTR(union acpi_parse_object,
 551                                   info->data_register_node)->named.data;
 552                 second_desc->extra.aml_length =
 553                     ACPI_CAST_PTR(union acpi_parse_object,
 554                                   info->data_register_node)->named.length;
 555
 556                 break;
 557
 558         case ACPI_TYPE_LOCAL_INDEX_FIELD:
 559
 560                 /* Get the Index and Data registers */
 561
 562                 obj_desc->index_field.index_obj =
 563                     acpi_ns_get_attached_object(info->register_node);
 564                 obj_desc->index_field.data_obj =
 565                     acpi_ns_get_attached_object(info->data_register_node);
 566
 567                 if (!obj_desc->index_field.data_obj
 568                     || !obj_desc->index_field.index_obj) {
 569                         ACPI_ERROR((AE_INFO,
 570                                     "Null Index Object during field prep"));
 571                         acpi_ut_delete_object_desc(obj_desc);
 572                         return_ACPI_STATUS(AE_AML_INTERNAL);
 573                 }
 574
 575                 /* An additional reference for the attached objects */
 576
 577                 acpi_ut_add_reference(obj_desc->index_field.data_obj);
 578                 acpi_ut_add_reference(obj_desc->index_field.index_obj);
 579
 580                 /*
 581                  * April 2006: Changed to match MS behavior
 582                  *
 583                  * The value written to the Index register is the byte offset of the
 584                  * target field in units of the granularity of the index_field
 585                  *
 586                  * Previously, the value was calculated as an index in terms of the
 587                  * width of the Data register, as below:
 588                  *
 589                  *      obj_desc->index_field.Value = (u32)
 590                  *          (Info->field_bit_position / ACPI_MUL_8 (
 591                  *              obj_desc->Field.access_byte_width));
 592                  *
 593                  * February 2006: Tried value as a byte offset:
 594                  *      obj_desc->index_field.Value = (u32)
 595                  *          ACPI_DIV_8 (Info->field_bit_position);
 596                  */
 597                 obj_desc->index_field.value =
 598                     (u32) ACPI_ROUND_DOWN(ACPI_DIV_8(info->field_bit_position),
 599                                           obj_desc->index_field.
 600                                           access_byte_width);
 601
 602                 ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
 603                                   "IndexField: BitOff %X, Off %X, Value %X, "
 604                                   "Gran %X, Index %p, Data %p\n",
 605                                   obj_desc->index_field.start_field_bit_offset,
 606                                   obj_desc->index_field.base_byte_offset,
 607                                   obj_desc->index_field.value,
 608                                   obj_desc->field.access_byte_width,
 609                                   obj_desc->index_field.index_obj,
 610                                   obj_desc->index_field.data_obj));
 611                 break;
 612
 613         default:
 614
 615                 /* No other types should get here */
 616
 617                 break;
 618         }
 619
 620         /*
 621          * Store the constructed descriptor (obj_desc) into the parent Node,
 622          * preserving the current type of that named_obj.
 623          */
 624         status =
 625             acpi_ns_attach_object(info->field_node, obj_desc,
 626                                   acpi_ns_get_type(info->field_node));
 627
 628         ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
 629                           "Set NamedObj %p [%4.4s], ObjDesc %p\n",
 630                           info->field_node,
 631                           acpi_ut_get_node_name(info->field_node), obj_desc));
 632
 633         /* Remove local reference to the object */
 634
 635         acpi_ut_remove_reference(obj_desc);
 636         return_ACPI_STATUS(status);
 637 }