drivers/acpi/acpica/dsopcode.c

   1 /******************************************************************************
   2  *
   3  * Module Name: dsopcode - Dispatcher suport for regions and fields
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2012, 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, FALSE);
  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 %u exceeds Buffer [%4.4s] size %u (bits)",
 233                             acpi_ut_get_node_name(result_desc),
 234                             bit_offset + bit_count,
 235                             acpi_ut_get_node_name(buffer_desc->buffer.node),
 236                             8 * (u32) buffer_desc->buffer.length));
 237                 status = AE_AML_BUFFER_LIMIT;
 238                 goto cleanup;
 239         }
 240
 241         /*
 242          * Initialize areas of the field object that are common to all fields
 243          * For field_flags, use LOCK_RULE = 0 (NO_LOCK),
 244          * UPDATE_RULE = 0 (UPDATE_PRESERVE)
 245          */
 246         status = 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 = acpi_ex_resolve_operands(op->common.aml_opcode,
 334                                           ACPI_WALK_OPERANDS, walk_state);
 335         if (ACPI_FAILURE(status)) {
 336                 ACPI_ERROR((AE_INFO, "(%s) bad operand(s), status 0x%X",
 337                             acpi_ps_get_opcode_name(op->common.aml_opcode),
 338                             status));
 339
 340                 return_ACPI_STATUS(status);
 341         }
 342
 343         /* Initialize the Buffer Field */
 344
 345         if (op->common.aml_opcode == AML_CREATE_FIELD_OP) {
 346
 347                 /* NOTE: Slightly different operands for this opcode */
 348
 349                 status =
 350                     acpi_ds_init_buffer_field(op->common.aml_opcode, obj_desc,
 351                                               walk_state->operands[0],
 352                                               walk_state->operands[1],
 353                                               walk_state->operands[2],
 354                                               walk_state->operands[3]);
 355         } else {
 356                 /* All other, create_xxx_field opcodes */
 357
 358                 status =
 359                     acpi_ds_init_buffer_field(op->common.aml_opcode, obj_desc,
 360                                               walk_state->operands[0],
 361                                               walk_state->operands[1], NULL,
 362                                               walk_state->operands[2]);
 363         }
 364
 365         return_ACPI_STATUS(status);
 366 }
 367
 368 /*******************************************************************************
 369  *
 370  * FUNCTION:    acpi_ds_eval_region_operands
 371  *
 372  * PARAMETERS:  walk_state      - Current walk
 373  *              Op              - A valid region Op object
 374  *
 375  * RETURN:      Status
 376  *
 377  * DESCRIPTION: Get region address and length
 378  *              Called from acpi_ds_exec_end_op during op_region parse tree walk
 379  *
 380  ******************************************************************************/
 381
 382 acpi_status
 383 acpi_ds_eval_region_operands(struct acpi_walk_state *walk_state,
 384                              union acpi_parse_object *op)
 385 {
 386         acpi_status status;
 387         union acpi_operand_object *obj_desc;
 388         union acpi_operand_object *operand_desc;
 389         struct acpi_namespace_node *node;
 390         union acpi_parse_object *next_op;
 391
 392         ACPI_FUNCTION_TRACE_PTR(ds_eval_region_operands, op);
 393
 394         /*
 395          * This is where we evaluate the address and length fields of the
 396          * op_region declaration
 397          */
 398         node = op->common.node;
 399
 400         /* next_op points to the op that holds the space_iD */
 401
 402         next_op = op->common.value.arg;
 403
 404         /* next_op points to address op */
 405
 406         next_op = next_op->common.next;
 407
 408         /* Evaluate/create the address and length operands */
 409
 410         status = acpi_ds_create_operands(walk_state, next_op);
 411         if (ACPI_FAILURE(status)) {
 412                 return_ACPI_STATUS(status);
 413         }
 414
 415         /* Resolve the length and address operands to numbers */
 416
 417         status = acpi_ex_resolve_operands(op->common.aml_opcode,
 418                                           ACPI_WALK_OPERANDS, walk_state);
 419         if (ACPI_FAILURE(status)) {
 420                 return_ACPI_STATUS(status);
 421         }
 422
 423         obj_desc = acpi_ns_get_attached_object(node);
 424         if (!obj_desc) {
 425                 return_ACPI_STATUS(AE_NOT_EXIST);
 426         }
 427
 428         /*
 429          * Get the length operand and save it
 430          * (at Top of stack)
 431          */
 432         operand_desc = walk_state->operands[walk_state->num_operands - 1];
 433
 434         obj_desc->region.length = (u32) operand_desc->integer.value;
 435         acpi_ut_remove_reference(operand_desc);
 436
 437         /*
 438          * Get the address and save it
 439          * (at top of stack - 1)
 440          */
 441         operand_desc = walk_state->operands[walk_state->num_operands - 2];
 442
 443         obj_desc->region.address = (acpi_physical_address)
 444             operand_desc->integer.value;
 445         acpi_ut_remove_reference(operand_desc);
 446
 447         ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "RgnObj %p Addr %8.8X%8.8X Len %X\n",
 448                           obj_desc,
 449                           ACPI_FORMAT_NATIVE_UINT(obj_desc->region.address),
 450                           obj_desc->region.length));
 451
 452         /* Now the address and length are valid for this opregion */
 453
 454         obj_desc->region.flags |= AOPOBJ_DATA_VALID;
 455
 456         return_ACPI_STATUS(status);
 457 }
 458
 459 /*******************************************************************************
 460  *
 461  * FUNCTION:    acpi_ds_eval_table_region_operands
 462  *
 463  * PARAMETERS:  walk_state      - Current walk
 464  *              Op              - A valid region Op object
 465  *
 466  * RETURN:      Status
 467  *
 468  * DESCRIPTION: Get region address and length.
 469  *              Called from acpi_ds_exec_end_op during data_table_region parse
 470  *              tree walk.
 471  *
 472  ******************************************************************************/
 473
 474 acpi_status
 475 acpi_ds_eval_table_region_operands(struct acpi_walk_state *walk_state,
 476                                    union acpi_parse_object *op)
 477 {
 478         acpi_status status;
 479         union acpi_operand_object *obj_desc;
 480         union acpi_operand_object **operand;
 481         struct acpi_namespace_node *node;
 482         union acpi_parse_object *next_op;
 483         u32 table_index;
 484         struct acpi_table_header *table;
 485
 486         ACPI_FUNCTION_TRACE_PTR(ds_eval_table_region_operands, op);
 487
 488         /*
 489          * This is where we evaluate the signature_string and oem_iDString
 490          * and oem_table_iDString of the data_table_region declaration
 491          */
 492         node = op->common.node;
 493
 494         /* next_op points to signature_string op */
 495
 496         next_op = op->common.value.arg;
 497
 498         /*
 499          * Evaluate/create the signature_string and oem_iDString
 500          * and oem_table_iDString operands
 501          */
 502         status = acpi_ds_create_operands(walk_state, next_op);
 503         if (ACPI_FAILURE(status)) {
 504                 return_ACPI_STATUS(status);
 505         }
 506
 507         /*
 508          * Resolve the signature_string and oem_iDString
 509          * and oem_table_iDString operands
 510          */
 511         status = acpi_ex_resolve_operands(op->common.aml_opcode,
 512                                           ACPI_WALK_OPERANDS, walk_state);
 513         if (ACPI_FAILURE(status)) {
 514                 return_ACPI_STATUS(status);
 515         }
 516
 517         operand = &walk_state->operands[0];
 518
 519         /* Find the ACPI table */
 520
 521         status = acpi_tb_find_table(operand[0]->string.pointer,
 522                                     operand[1]->string.pointer,
 523                                     operand[2]->string.pointer, &table_index);
 524         if (ACPI_FAILURE(status)) {
 525                 return_ACPI_STATUS(status);
 526         }
 527
 528         acpi_ut_remove_reference(operand[0]);
 529         acpi_ut_remove_reference(operand[1]);
 530         acpi_ut_remove_reference(operand[2]);
 531
 532         status = acpi_get_table_by_index(table_index, &table);
 533         if (ACPI_FAILURE(status)) {
 534                 return_ACPI_STATUS(status);
 535         }
 536
 537         obj_desc = acpi_ns_get_attached_object(node);
 538         if (!obj_desc) {
 539                 return_ACPI_STATUS(AE_NOT_EXIST);
 540         }
 541
 542         obj_desc->region.address =
 543             (acpi_physical_address) ACPI_TO_INTEGER(table);
 544         obj_desc->region.length = table->length;
 545
 546         ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "RgnObj %p Addr %8.8X%8.8X Len %X\n",
 547                           obj_desc,
 548                           ACPI_FORMAT_NATIVE_UINT(obj_desc->region.address),
 549                           obj_desc->region.length));
 550
 551         /* Now the address and length are valid for this opregion */
 552
 553         obj_desc->region.flags |= AOPOBJ_DATA_VALID;
 554
 555         return_ACPI_STATUS(status);
 556 }
 557
 558 /*******************************************************************************
 559  *
 560  * FUNCTION:    acpi_ds_eval_data_object_operands
 561  *
 562  * PARAMETERS:  walk_state      - Current walk
 563  *              Op              - A valid data_object Op object
 564  *              obj_desc        - data_object
 565  *
 566  * RETURN:      Status
 567  *
 568  * DESCRIPTION: Get the operands and complete the following data object types:
 569  *              Buffer, Package.
 570  *
 571  ******************************************************************************/
 572
 573 acpi_status
 574 acpi_ds_eval_data_object_operands(struct acpi_walk_state *walk_state,
 575                                   union acpi_parse_object *op,
 576                                   union acpi_operand_object *obj_desc)
 577 {
 578         acpi_status status;
 579         union acpi_operand_object *arg_desc;
 580         u32 length;
 581
 582         ACPI_FUNCTION_TRACE(ds_eval_data_object_operands);
 583
 584         /* The first operand (for all of these data objects) is the length */
 585
 586         /*
 587          * Set proper index into operand stack for acpi_ds_obj_stack_push
 588          * invoked inside acpi_ds_create_operand.
 589          */
 590         walk_state->operand_index = walk_state->num_operands;
 591
 592         status = acpi_ds_create_operand(walk_state, op->common.value.arg, 1);
 593         if (ACPI_FAILURE(status)) {
 594                 return_ACPI_STATUS(status);
 595         }
 596
 597         status = acpi_ex_resolve_operands(walk_state->opcode,
 598                                           &(walk_state->
 599                                             operands[walk_state->num_operands -
 600                                                      1]), walk_state);
 601         if (ACPI_FAILURE(status)) {
 602                 return_ACPI_STATUS(status);
 603         }
 604
 605         /* Extract length operand */
 606
 607         arg_desc = walk_state->operands[walk_state->num_operands - 1];
 608         length = (u32) arg_desc->integer.value;
 609
 610         /* Cleanup for length operand */
 611
 612         status = acpi_ds_obj_stack_pop(1, walk_state);
 613         if (ACPI_FAILURE(status)) {
 614                 return_ACPI_STATUS(status);
 615         }
 616
 617         acpi_ut_remove_reference(arg_desc);
 618
 619         /*
 620          * Create the actual data object
 621          */
 622         switch (op->common.aml_opcode) {
 623         case AML_BUFFER_OP:
 624
 625                 status =
 626                     acpi_ds_build_internal_buffer_obj(walk_state, op, length,
 627                                                       &obj_desc);
 628                 break;
 629
 630         case AML_PACKAGE_OP:
 631         case AML_VAR_PACKAGE_OP:
 632
 633                 status =
 634                     acpi_ds_build_internal_package_obj(walk_state, op, length,
 635                                                        &obj_desc);
 636                 break;
 637
 638         default:
 639                 return_ACPI_STATUS(AE_AML_BAD_OPCODE);
 640         }
 641
 642         if (ACPI_SUCCESS(status)) {
 643                 /*
 644                  * Return the object in the walk_state, unless the parent is a package -
 645                  * in this case, the return object will be stored in the parse tree
 646                  * for the package.
 647                  */
 648                 if ((!op->common.parent) ||
 649                     ((op->common.parent->common.aml_opcode != AML_PACKAGE_OP) &&
 650                      (op->common.parent->common.aml_opcode !=
 651                       AML_VAR_PACKAGE_OP)
 652                      && (op->common.parent->common.aml_opcode != AML_NAME_OP))) {
 653                         walk_state->result_obj = obj_desc;
 654                 }
 655         }
 656
 657         return_ACPI_STATUS(status);
 658 }
 659
 660 /*******************************************************************************
 661  *
 662  * FUNCTION:    acpi_ds_eval_bank_field_operands
 663  *
 664  * PARAMETERS:  walk_state      - Current walk
 665  *              Op              - A valid bank_field Op object
 666  *
 667  * RETURN:      Status
 668  *
 669  * DESCRIPTION: Get bank_field bank_value
 670  *              Called from acpi_ds_exec_end_op during bank_field parse tree walk
 671  *
 672  ******************************************************************************/
 673
 674 acpi_status
 675 acpi_ds_eval_bank_field_operands(struct acpi_walk_state *walk_state,
 676                                  union acpi_parse_object *op)
 677 {
 678         acpi_status status;
 679         union acpi_operand_object *obj_desc;
 680         union acpi_operand_object *operand_desc;
 681         struct acpi_namespace_node *node;
 682         union acpi_parse_object *next_op;
 683         union acpi_parse_object *arg;
 684
 685         ACPI_FUNCTION_TRACE_PTR(ds_eval_bank_field_operands, op);
 686
 687         /*
 688          * This is where we evaluate the bank_value field of the
 689          * bank_field declaration
 690          */
 691
 692         /* next_op points to the op that holds the Region */
 693
 694         next_op = op->common.value.arg;
 695
 696         /* next_op points to the op that holds the Bank Register */
 697
 698         next_op = next_op->common.next;
 699
 700         /* next_op points to the op that holds the Bank Value */
 701
 702         next_op = next_op->common.next;
 703
 704         /*
 705          * Set proper index into operand stack for acpi_ds_obj_stack_push
 706          * invoked inside acpi_ds_create_operand.
 707          *
 708          * We use walk_state->Operands[0] to store the evaluated bank_value
 709          */
 710         walk_state->operand_index = 0;
 711
 712         status = acpi_ds_create_operand(walk_state, next_op, 0);
 713         if (ACPI_FAILURE(status)) {
 714                 return_ACPI_STATUS(status);
 715         }
 716
 717         status = acpi_ex_resolve_to_value(&walk_state->operands[0], walk_state);
 718         if (ACPI_FAILURE(status)) {
 719                 return_ACPI_STATUS(status);
 720         }
 721
 722         ACPI_DUMP_OPERANDS(ACPI_WALK_OPERANDS,
 723                            acpi_ps_get_opcode_name(op->common.aml_opcode), 1);
 724         /*
 725          * Get the bank_value operand and save it
 726          * (at Top of stack)
 727          */
 728         operand_desc = walk_state->operands[0];
 729
 730         /* Arg points to the start Bank Field */
 731
 732         arg = acpi_ps_get_arg(op, 4);
 733         while (arg) {
 734
 735                 /* Ignore OFFSET and ACCESSAS terms here */
 736
 737                 if (arg->common.aml_opcode == AML_INT_NAMEDFIELD_OP) {
 738                         node = arg->common.node;
 739
 740                         obj_desc = acpi_ns_get_attached_object(node);
 741                         if (!obj_desc) {
 742                                 return_ACPI_STATUS(AE_NOT_EXIST);
 743                         }
 744
 745                         obj_desc->bank_field.value =
 746                             (u32) operand_desc->integer.value;
 747                 }
 748
 749                 /* Move to next field in the list */
 750
 751                 arg = arg->common.next;
 752         }
 753
 754         acpi_ut_remove_reference(operand_desc);
 755         return_ACPI_STATUS(status);
 756 }