drivers/acpi/acpica/dsopcode.c

   1 /******************************************************************************
   2  *
   3  * Module Name: dsopcode - Dispatcher support for regions and fields
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2017, 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 "acparser.h"
  47 #include "amlcode.h"
  48 #include "acdispat.h"
  49 #include "acinterp.h"
  50 #include "acnamesp.h"
  51 #include "acevents.h"
  52 #include "actables.h"
  53
  54 #define _COMPONENT          ACPI_DISPATCHER
  55 ACPI_MODULE_NAME("dsopcode")
  56
  57 /* Local prototypes */
  58 static acpi_status
  59 acpi_ds_init_buffer_field(u16 aml_opcode,
  60                           union acpi_operand_object *obj_desc,
  61                           union acpi_operand_object *buffer_desc,
  62                           union acpi_operand_object *offset_desc,
  63                           union acpi_operand_object *length_desc,
  64                           union acpi_operand_object *result_desc);
  65
  66 /*******************************************************************************
  67  *
  68  * FUNCTION:    acpi_ds_initialize_region
  69  *
  70  * PARAMETERS:  obj_handle      - Region namespace node
  71  *
  72  * RETURN:      Status
  73  *
  74  * DESCRIPTION: Front end to ev_initialize_region
  75  *
  76  ******************************************************************************/
  77
  78 acpi_status acpi_ds_initialize_region(acpi_handle obj_handle)
  79 {
  80         union acpi_operand_object *obj_desc;
  81         acpi_status status;
  82
  83         obj_desc = acpi_ns_get_attached_object(obj_handle);
  84
  85         /* Namespace is NOT locked */
  86
  87         status = acpi_ev_initialize_region(obj_desc);
  88         return (status);
  89 }
  90
  91 /*******************************************************************************
  92  *
  93  * FUNCTION:    acpi_ds_init_buffer_field
  94  *
  95  * PARAMETERS:  aml_opcode      - create_xxx_field
  96  *              obj_desc        - buffer_field object
  97  *              buffer_desc     - Host Buffer
  98  *              offset_desc     - Offset into buffer
  99  *              length_desc     - Length of field (CREATE_FIELD_OP only)
 100  *              result_desc     - Where to store the result
 101  *
 102  * RETURN:      Status
 103  *
 104  * DESCRIPTION: Perform actual initialization of a buffer field
 105  *
 106  ******************************************************************************/
 107
 108 static acpi_status
 109 acpi_ds_init_buffer_field(u16 aml_opcode,
 110                           union acpi_operand_object *obj_desc,
 111                           union acpi_operand_object *buffer_desc,
 112                           union acpi_operand_object *offset_desc,
 113                           union acpi_operand_object *length_desc,
 114                           union acpi_operand_object *result_desc)
 115 {
 116         u32 offset;
 117         u32 bit_offset;
 118         u32 bit_count;
 119         u8 field_flags;
 120         acpi_status status;
 121
 122         ACPI_FUNCTION_TRACE_PTR(ds_init_buffer_field, obj_desc);
 123
 124         /* Host object must be a Buffer */
 125
 126         if (buffer_desc->common.type != ACPI_TYPE_BUFFER) {
 127                 ACPI_ERROR((AE_INFO,
 128                             "Target of Create Field is not a Buffer object - %s",
 129                             acpi_ut_get_object_type_name(buffer_desc)));
 130
 131                 status = AE_AML_OPERAND_TYPE;
 132                 goto cleanup;
 133         }
 134
 135         /*
 136          * The last parameter to all of these opcodes (result_desc) started
 137          * out as a name_string, and should therefore now be a NS node
 138          * after resolution in acpi_ex_resolve_operands().
 139          */
 140         if (ACPI_GET_DESCRIPTOR_TYPE(result_desc) != ACPI_DESC_TYPE_NAMED) {
 141                 ACPI_ERROR((AE_INFO,
 142                             "(%s) destination not a NS Node [%s]",
 143                             acpi_ps_get_opcode_name(aml_opcode),
 144                             acpi_ut_get_descriptor_name(result_desc)));
 145
 146                 status = AE_AML_OPERAND_TYPE;
 147                 goto cleanup;
 148         }
 149
 150         offset = (u32) offset_desc->integer.value;
 151
 152         /*
 153          * Setup the Bit offsets and counts, according to the opcode
 154          */
 155         switch (aml_opcode) {
 156         case AML_CREATE_FIELD_OP:
 157
 158                 /* Offset is in bits, count is in bits */
 159
 160                 field_flags = AML_FIELD_ACCESS_BYTE;
 161                 bit_offset = offset;
 162                 bit_count = (u32) length_desc->integer.value;
 163
 164                 /* Must have a valid (>0) bit count */
 165
 166                 if (bit_count == 0) {
 167                         ACPI_ERROR((AE_INFO,
 168                                     "Attempt to CreateField of length zero"));
 169                         status = AE_AML_OPERAND_VALUE;
 170                         goto cleanup;
 171                 }
 172                 break;
 173
 174         case AML_CREATE_BIT_FIELD_OP:
 175
 176                 /* Offset is in bits, Field is one bit */
 177
 178                 bit_offset = offset;
 179                 bit_count = 1;
 180                 field_flags = AML_FIELD_ACCESS_BYTE;
 181                 break;
 182
 183         case AML_CREATE_BYTE_FIELD_OP:
 184
 185                 /* Offset is in bytes, field is one byte */
 186
 187                 bit_offset = 8 * offset;
 188                 bit_count = 8;
 189                 field_flags = AML_FIELD_ACCESS_BYTE;
 190                 break;
 191
 192         case AML_CREATE_WORD_FIELD_OP:
 193
 194                 /* Offset is in bytes, field is one word */
 195
 196                 bit_offset = 8 * offset;
 197                 bit_count = 16;
 198                 field_flags = AML_FIELD_ACCESS_WORD;
 199                 break;
 200
 201         case AML_CREATE_DWORD_FIELD_OP:
 202
 203                 /* Offset is in bytes, field is one dword */
 204
 205                 bit_offset = 8 * offset;
 206                 bit_count = 32;
 207                 field_flags = AML_FIELD_ACCESS_DWORD;
 208                 break;
 209
 210         case AML_CREATE_QWORD_FIELD_OP:
 211
 212                 /* Offset is in bytes, field is one qword */
 213
 214                 bit_offset = 8 * offset;
 215                 bit_count = 64;
 216                 field_flags = AML_FIELD_ACCESS_QWORD;
 217                 break;
 218
 219         default:
 220
 221                 ACPI_ERROR((AE_INFO,
 222                             "Unknown field creation opcode 0x%02X",
 223                             aml_opcode));
 224                 status = AE_AML_BAD_OPCODE;
 225                 goto cleanup;
 226         }
 227
 228         /* Entire field must fit within the current length of the buffer */
 229
 230         if ((bit_offset + bit_count) > (8 * (u32)buffer_desc->buffer.length)) {
 231                 ACPI_ERROR((AE_INFO,
 232                             "Field [%4.4s] at bit offset/length %u/%u "
 233                             "exceeds size of target Buffer (%u bits)",
 234                             acpi_ut_get_node_name(result_desc), bit_offset,
 235                             bit_count, 8 * (u32)buffer_desc->buffer.length));
 236                 status = AE_AML_BUFFER_LIMIT;
 237                 goto cleanup;
 238         }
 239
 240         /*
 241          * Initialize areas of the field object that are common to all fields
 242          * For field_flags, use LOCK_RULE = 0 (NO_LOCK),
 243          * UPDATE_RULE = 0 (UPDATE_PRESERVE)
 244          */
 245         status =
 246             acpi_ex_prep_common_field_object(obj_desc, field_flags, 0,
 247                                              bit_offset, bit_count);
 248         if (ACPI_FAILURE(status)) {
 249                 goto cleanup;
 250         }
 251
 252         obj_desc->buffer_field.buffer_obj = buffer_desc;
 253
 254         /* Reference count for buffer_desc inherits obj_desc count */
 255
 256         buffer_desc->common.reference_count = (u16)
 257             (buffer_desc->common.reference_count +
 258              obj_desc->common.reference_count);
 259
 260 cleanup:
 261
 262         /* Always delete the operands */
 263
 264         acpi_ut_remove_reference(offset_desc);
 265         acpi_ut_remove_reference(buffer_desc);
 266
 267         if (aml_opcode == AML_CREATE_FIELD_OP) {
 268                 acpi_ut_remove_reference(length_desc);
 269         }
 270
 271         /* On failure, delete the result descriptor */
 272
 273         if (ACPI_FAILURE(status)) {
 274                 acpi_ut_remove_reference(result_desc);  /* Result descriptor */
 275         } else {
 276                 /* Now the address and length are valid for this buffer_field */
 277
 278                 obj_desc->buffer_field.flags |= AOPOBJ_DATA_VALID;
 279         }
 280
 281         return_ACPI_STATUS(status);
 282 }
 283
 284 /*******************************************************************************
 285  *
 286  * FUNCTION:    acpi_ds_eval_buffer_field_operands
 287  *
 288  * PARAMETERS:  walk_state      - Current walk
 289  *              op              - A valid buffer_field Op object
 290  *
 291  * RETURN:      Status
 292  *
 293  * DESCRIPTION: Get buffer_field Buffer and Index
 294  *              Called from acpi_ds_exec_end_op during buffer_field parse tree walk
 295  *
 296  ******************************************************************************/
 297
 298 acpi_status
 299 acpi_ds_eval_buffer_field_operands(struct acpi_walk_state *walk_state,
 300                                    union acpi_parse_object *op)
 301 {
 302         acpi_status status;
 303         union acpi_operand_object *obj_desc;
 304         struct acpi_namespace_node *node;
 305         union acpi_parse_object *next_op;
 306
 307         ACPI_FUNCTION_TRACE_PTR(ds_eval_buffer_field_operands, op);
 308
 309         /*
 310          * This is where we evaluate the address and length fields of the
 311          * create_xxx_field declaration
 312          */
 313         node = op->common.node;
 314
 315         /* next_op points to the op that holds the Buffer */
 316
 317         next_op = op->common.value.arg;
 318
 319         /* Evaluate/create the address and length operands */
 320
 321         status = acpi_ds_create_operands(walk_state, next_op);
 322         if (ACPI_FAILURE(status)) {
 323                 return_ACPI_STATUS(status);
 324         }
 325
 326         obj_desc = acpi_ns_get_attached_object(node);
 327         if (!obj_desc) {
 328                 return_ACPI_STATUS(AE_NOT_EXIST);
 329         }
 330
 331         /* Resolve the operands */
 332
 333         status =
 334             acpi_ex_resolve_operands(op->common.aml_opcode, ACPI_WALK_OPERANDS,
 335                                      walk_state);
 336         if (ACPI_FAILURE(status)) {
 337                 ACPI_ERROR((AE_INFO, "(%s) bad operand(s), status 0x%X",
 338                             acpi_ps_get_opcode_name(op->common.aml_opcode),
 339                             status));
 340
 341                 return_ACPI_STATUS(status);
 342         }
 343
 344         /* Initialize the Buffer Field */
 345
 346         if (op->common.aml_opcode == AML_CREATE_FIELD_OP) {
 347
 348                 /* NOTE: Slightly different operands for this opcode */
 349
 350                 status =
 351                     acpi_ds_init_buffer_field(op->common.aml_opcode, obj_desc,
 352                                               walk_state->operands[0],
 353                                               walk_state->operands[1],
 354                                               walk_state->operands[2],
 355                                               walk_state->operands[3]);
 356         } else {
 357                 /* All other, create_xxx_field opcodes */
 358
 359                 status =
 360                     acpi_ds_init_buffer_field(op->common.aml_opcode, obj_desc,
 361                                               walk_state->operands[0],
 362                                               walk_state->operands[1], NULL,
 363                                               walk_state->operands[2]);
 364         }
 365
 366         return_ACPI_STATUS(status);
 367 }
 368
 369 /*******************************************************************************
 370  *
 371  * FUNCTION:    acpi_ds_eval_region_operands
 372  *
 373  * PARAMETERS:  walk_state      - Current walk
 374  *              op              - A valid region Op object
 375  *
 376  * RETURN:      Status
 377  *
 378  * DESCRIPTION: Get region address and length
 379  *              Called from acpi_ds_exec_end_op during op_region parse tree walk
 380  *
 381  ******************************************************************************/
 382
 383 acpi_status
 384 acpi_ds_eval_region_operands(struct acpi_walk_state *walk_state,
 385                              union acpi_parse_object *op)
 386 {
 387         acpi_status status;
 388         union acpi_operand_object *obj_desc;
 389         union acpi_operand_object *operand_desc;
 390         struct acpi_namespace_node *node;
 391         union acpi_parse_object *next_op;
 392
 393         ACPI_FUNCTION_TRACE_PTR(ds_eval_region_operands, op);
 394
 395         /*
 396          * This is where we evaluate the address and length fields of the
 397          * op_region declaration
 398          */
 399         node = op->common.node;
 400
 401         /* next_op points to the op that holds the space_ID */
 402
 403         next_op = op->common.value.arg;
 404
 405         /* next_op points to address op */
 406
 407         next_op = next_op->common.next;
 408
 409         /* Evaluate/create the address and length operands */
 410
 411         status = acpi_ds_create_operands(walk_state, next_op);
 412         if (ACPI_FAILURE(status)) {
 413                 return_ACPI_STATUS(status);
 414         }
 415
 416         /* Resolve the length and address operands to numbers */
 417
 418         status =
 419             acpi_ex_resolve_operands(op->common.aml_opcode, ACPI_WALK_OPERANDS,
 420                                      walk_state);
 421         if (ACPI_FAILURE(status)) {
 422                 return_ACPI_STATUS(status);
 423         }
 424
 425         obj_desc = acpi_ns_get_attached_object(node);
 426         if (!obj_desc) {
 427                 return_ACPI_STATUS(AE_NOT_EXIST);
 428         }
 429
 430         /*
 431          * Get the length operand and save it
 432          * (at Top of stack)
 433          */
 434         operand_desc = walk_state->operands[walk_state->num_operands - 1];
 435
 436         obj_desc->region.length = (u32) operand_desc->integer.value;
 437         acpi_ut_remove_reference(operand_desc);
 438
 439         /*
 440          * Get the address and save it
 441          * (at top of stack - 1)
 442          */
 443         operand_desc = walk_state->operands[walk_state->num_operands - 2];
 444
 445         obj_desc->region.address = (acpi_physical_address)
 446             operand_desc->integer.value;
 447         acpi_ut_remove_reference(operand_desc);
 448
 449         ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "RgnObj %p Addr %8.8X%8.8X Len %X\n",
 450                           obj_desc,
 451                           ACPI_FORMAT_UINT64(obj_desc->region.address),
 452                           obj_desc->region.length));
 453
 454         status = acpi_ut_add_address_range(obj_desc->region.space_id,
 455                                            obj_desc->region.address,
 456                                            obj_desc->region.length, node);
 457
 458         /* Now the address and length are valid for this opregion */
 459
 460         obj_desc->region.flags |= AOPOBJ_DATA_VALID;
 461         return_ACPI_STATUS(status);
 462 }
 463
 464 /*******************************************************************************
 465  *
 466  * FUNCTION:    acpi_ds_eval_table_region_operands
 467  *
 468  * PARAMETERS:  walk_state      - Current walk
 469  *              op              - A valid region Op object
 470  *
 471  * RETURN:      Status
 472  *
 473  * DESCRIPTION: Get region address and length.
 474  *              Called from acpi_ds_exec_end_op during data_table_region parse
 475  *              tree walk.
 476  *
 477  ******************************************************************************/
 478
 479 acpi_status
 480 acpi_ds_eval_table_region_operands(struct acpi_walk_state *walk_state,
 481                                    union acpi_parse_object *op)
 482 {
 483         acpi_status status;
 484         union acpi_operand_object *obj_desc;
 485         union acpi_operand_object **operand;
 486         struct acpi_namespace_node *node;
 487         union acpi_parse_object *next_op;
 488         struct acpi_table_header *table;
 489         u32 table_index;
 490
 491         ACPI_FUNCTION_TRACE_PTR(ds_eval_table_region_operands, op);
 492
 493         /*
 494          * This is where we evaluate the Signature string, oem_id string,
 495          * and oem_table_id string of the Data Table Region declaration
 496          */
 497         node = op->common.node;
 498
 499         /* next_op points to Signature string op */
 500
 501         next_op = op->common.value.arg;
 502
 503         /*
 504          * Evaluate/create the Signature string, oem_id string,
 505          * and oem_table_id string operands
 506          */
 507         status = acpi_ds_create_operands(walk_state, next_op);
 508         if (ACPI_FAILURE(status)) {
 509                 return_ACPI_STATUS(status);
 510         }
 511
 512         operand = &walk_state->operands[0];
 513
 514         /*
 515          * Resolve the Signature string, oem_id string,
 516          * and oem_table_id string operands
 517          */
 518         status =
 519             acpi_ex_resolve_operands(op->common.aml_opcode, ACPI_WALK_OPERANDS,
 520                                      walk_state);
 521         if (ACPI_FAILURE(status)) {
 522                 goto cleanup;
 523         }
 524
 525         /* Find the ACPI table */
 526
 527         status = acpi_tb_find_table(operand[0]->string.pointer,
 528                                     operand[1]->string.pointer,
 529                                     operand[2]->string.pointer, &table_index);
 530         if (ACPI_FAILURE(status)) {
 531                 if (status == AE_NOT_FOUND) {
 532                         ACPI_ERROR((AE_INFO,
 533                                     "ACPI Table [%4.4s] OEM:(%s, %s) not found in RSDT/XSDT",
 534                                     operand[0]->string.pointer,
 535                                     operand[1]->string.pointer,
 536                                     operand[2]->string.pointer));
 537                 }
 538                 goto cleanup;
 539         }
 540
 541         status = acpi_get_table_by_index(table_index, &table);
 542         if (ACPI_FAILURE(status)) {
 543                 goto cleanup;
 544         }
 545
 546         obj_desc = acpi_ns_get_attached_object(node);
 547         if (!obj_desc) {
 548                 status = AE_NOT_EXIST;
 549                 goto cleanup;
 550         }
 551
 552         obj_desc->region.address = ACPI_PTR_TO_PHYSADDR(table);
 553         obj_desc->region.length = table->length;
 554
 555         ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "RgnObj %p Addr %8.8X%8.8X Len %X\n",
 556                           obj_desc,
 557                           ACPI_FORMAT_UINT64(obj_desc->region.address),
 558                           obj_desc->region.length));
 559
 560         /* Now the address and length are valid for this opregion */
 561
 562         obj_desc->region.flags |= AOPOBJ_DATA_VALID;
 563
 564 cleanup:
 565         acpi_ut_remove_reference(operand[0]);
 566         acpi_ut_remove_reference(operand[1]);
 567         acpi_ut_remove_reference(operand[2]);
 568
 569         return_ACPI_STATUS(status);
 570 }
 571
 572 /*******************************************************************************
 573  *
 574  * FUNCTION:    acpi_ds_eval_data_object_operands
 575  *
 576  * PARAMETERS:  walk_state      - Current walk
 577  *              op              - A valid data_object Op object
 578  *              obj_desc        - data_object
 579  *
 580  * RETURN:      Status
 581  *
 582  * DESCRIPTION: Get the operands and complete the following data object types:
 583  *              Buffer, Package.
 584  *
 585  ******************************************************************************/
 586
 587 acpi_status
 588 acpi_ds_eval_data_object_operands(struct acpi_walk_state *walk_state,
 589                                   union acpi_parse_object *op,
 590                                   union acpi_operand_object *obj_desc)
 591 {
 592         acpi_status status;
 593         union acpi_operand_object *arg_desc;
 594         u32 length;
 595
 596         ACPI_FUNCTION_TRACE(ds_eval_data_object_operands);
 597
 598         /* The first operand (for all of these data objects) is the length */
 599
 600         /*
 601          * Set proper index into operand stack for acpi_ds_obj_stack_push
 602          * invoked inside acpi_ds_create_operand.
 603          */
 604         walk_state->operand_index = walk_state->num_operands;
 605
 606         /* Ignore if child is not valid */
 607
 608         if (!op->common.value.arg) {
 609                 ACPI_ERROR((AE_INFO,
 610                             "Dispatch: Missing child while executing TermArg for %X",
 611                             op->common.aml_opcode));
 612                 return_ACPI_STATUS(AE_OK);
 613         }
 614
 615         status = acpi_ds_create_operand(walk_state, op->common.value.arg, 1);
 616         if (ACPI_FAILURE(status)) {
 617                 return_ACPI_STATUS(status);
 618         }
 619
 620         status = acpi_ex_resolve_operands(walk_state->opcode,
 621                                           &(walk_state->
 622                                             operands[walk_state->num_operands -
 623                                                      1]), walk_state);
 624         if (ACPI_FAILURE(status)) {
 625                 return_ACPI_STATUS(status);
 626         }
 627
 628         /* Extract length operand */
 629
 630         arg_desc = walk_state->operands[walk_state->num_operands - 1];
 631         length = (u32) arg_desc->integer.value;
 632
 633         /* Cleanup for length operand */
 634
 635         status = acpi_ds_obj_stack_pop(1, walk_state);
 636         if (ACPI_FAILURE(status)) {
 637                 return_ACPI_STATUS(status);
 638         }
 639
 640         acpi_ut_remove_reference(arg_desc);
 641
 642         /*
 643          * Create the actual data object
 644          */
 645         switch (op->common.aml_opcode) {
 646         case AML_BUFFER_OP:
 647
 648                 status =
 649                     acpi_ds_build_internal_buffer_obj(walk_state, op, length,
 650                                                       &obj_desc);
 651                 break;
 652
 653         case AML_PACKAGE_OP:
 654         case AML_VARIABLE_PACKAGE_OP:
 655
 656                 status =
 657                     acpi_ds_build_internal_package_obj(walk_state, op, length,
 658                                                        &obj_desc);
 659                 break;
 660
 661         default:
 662
 663                 return_ACPI_STATUS(AE_AML_BAD_OPCODE);
 664         }
 665
 666         if (ACPI_SUCCESS(status)) {
 667                 /*
 668                  * Return the object in the walk_state, unless the parent is a package -
 669                  * in this case, the return object will be stored in the parse tree
 670                  * for the package.
 671                  */
 672                 if ((!op->common.parent) ||
 673                     ((op->common.parent->common.aml_opcode != AML_PACKAGE_OP) &&
 674                      (op->common.parent->common.aml_opcode !=
 675                       AML_VARIABLE_PACKAGE_OP)
 676                      && (op->common.parent->common.aml_opcode !=
 677                          AML_NAME_OP))) {
 678                         walk_state->result_obj = obj_desc;
 679                 }
 680         }
 681
 682         return_ACPI_STATUS(status);
 683 }
 684
 685 /*******************************************************************************
 686  *
 687  * FUNCTION:    acpi_ds_eval_bank_field_operands
 688  *
 689  * PARAMETERS:  walk_state      - Current walk
 690  *              op              - A valid bank_field Op object
 691  *
 692  * RETURN:      Status
 693  *
 694  * DESCRIPTION: Get bank_field bank_value
 695  *              Called from acpi_ds_exec_end_op during bank_field parse tree walk
 696  *
 697  ******************************************************************************/
 698
 699 acpi_status
 700 acpi_ds_eval_bank_field_operands(struct acpi_walk_state *walk_state,
 701                                  union acpi_parse_object *op)
 702 {
 703         acpi_status status;
 704         union acpi_operand_object *obj_desc;
 705         union acpi_operand_object *operand_desc;
 706         struct acpi_namespace_node *node;
 707         union acpi_parse_object *next_op;
 708         union acpi_parse_object *arg;
 709
 710         ACPI_FUNCTION_TRACE_PTR(ds_eval_bank_field_operands, op);
 711
 712         /*
 713          * This is where we evaluate the bank_value field of the
 714          * bank_field declaration
 715          */
 716
 717         /* next_op points to the op that holds the Region */
 718
 719         next_op = op->common.value.arg;
 720
 721         /* next_op points to the op that holds the Bank Register */
 722
 723         next_op = next_op->common.next;
 724
 725         /* next_op points to the op that holds the Bank Value */
 726
 727         next_op = next_op->common.next;
 728
 729         /*
 730          * Set proper index into operand stack for acpi_ds_obj_stack_push
 731          * invoked inside acpi_ds_create_operand.
 732          *
 733          * We use walk_state->Operands[0] to store the evaluated bank_value
 734          */
 735         walk_state->operand_index = 0;
 736
 737         status = acpi_ds_create_operand(walk_state, next_op, 0);
 738         if (ACPI_FAILURE(status)) {
 739                 return_ACPI_STATUS(status);
 740         }
 741
 742         status = acpi_ex_resolve_to_value(&walk_state->operands[0], walk_state);
 743         if (ACPI_FAILURE(status)) {
 744                 return_ACPI_STATUS(status);
 745         }
 746
 747         ACPI_DUMP_OPERANDS(ACPI_WALK_OPERANDS,
 748                            acpi_ps_get_opcode_name(op->common.aml_opcode), 1);
 749         /*
 750          * Get the bank_value operand and save it
 751          * (at Top of stack)
 752          */
 753         operand_desc = walk_state->operands[0];
 754
 755         /* Arg points to the start Bank Field */
 756
 757         arg = acpi_ps_get_arg(op, 4);
 758         while (arg) {
 759
 760                 /* Ignore OFFSET and ACCESSAS terms here */
 761
 762                 if (arg->common.aml_opcode == AML_INT_NAMEDFIELD_OP) {
 763                         node = arg->common.node;
 764
 765                         obj_desc = acpi_ns_get_attached_object(node);
 766                         if (!obj_desc) {
 767                                 return_ACPI_STATUS(AE_NOT_EXIST);
 768                         }
 769
 770                         obj_desc->bank_field.value =
 771                             (u32) operand_desc->integer.value;
 772                 }
 773
 774                 /* Move to next field in the list */
 775
 776                 arg = arg->common.next;
 777         }
 778
 779         acpi_ut_remove_reference(operand_desc);
 780         return_ACPI_STATUS(status);
 781 }