LXR linux/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 - 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 "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
  55ACPI_MODULE_NAME("dsopcode")
  56
  57/* Local prototypes */
  58static acpi_status
  59acpi_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
  78acpi_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
 108static acpi_status
 109acpi_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 =
 247            acpi_ex_prep_common_field_object(obj_desc, field_flags, 0,
 248                                             bit_offset, bit_count);
 249        if (ACPI_FAILURE(status)) {
 250                goto cleanup;
 251        }
 252
 253        obj_desc->buffer_field.buffer_obj = buffer_desc;
 254
 255        /* Reference count for buffer_desc inherits obj_desc count */
 256
 257        buffer_desc->common.reference_count = (u16)
 258            (buffer_desc->common.reference_count +
 259             obj_desc->common.reference_count);
 260
 261cleanup:
 262
 263        /* Always delete the operands */
 264
 265        acpi_ut_remove_reference(offset_desc);
 266        acpi_ut_remove_reference(buffer_desc);
 267
 268        if (aml_opcode == AML_CREATE_FIELD_OP) {
 269                acpi_ut_remove_reference(length_desc);
 270        }
 271
 272        /* On failure, delete the result descriptor */
 273
 274        if (ACPI_FAILURE(status)) {
 275                acpi_ut_remove_reference(result_desc);  /* Result descriptor */
 276        } else {
 277                /* Now the address and length are valid for this buffer_field */
 278
 279                obj_desc->buffer_field.flags |= AOPOBJ_DATA_VALID;
 280        }
 281
 282        return_ACPI_STATUS(status);
 283}
 284
 285/*******************************************************************************
 286 *
 287 * FUNCTION:    acpi_ds_eval_buffer_field_operands
 288 *
 289 * PARAMETERS:  walk_state      - Current walk
 290 *              op              - A valid buffer_field Op object
 291 *
 292 * RETURN:      Status
 293 *
 294 * DESCRIPTION: Get buffer_field Buffer and Index
 295 *              Called from acpi_ds_exec_end_op during buffer_field parse tree walk
 296 *
 297 ******************************************************************************/
 298
 299acpi_status
 300acpi_ds_eval_buffer_field_operands(struct acpi_walk_state *walk_state,
 301                                   union acpi_parse_object *op)
 302{
 303        acpi_status status;
 304        union acpi_operand_object *obj_desc;
 305        struct acpi_namespace_node *node;
 306        union acpi_parse_object *next_op;
 307
 308        ACPI_FUNCTION_TRACE_PTR(ds_eval_buffer_field_operands, op);
 309
 310        /*
 311         * This is where we evaluate the address and length fields of the
 312         * create_xxx_field declaration
 313         */
 314        node = op->common.node;
 315
 316        /* next_op points to the op that holds the Buffer */
 317
 318        next_op = op->common.value.arg;
 319
 320        /* Evaluate/create the address and length operands */
 321
 322        status = acpi_ds_create_operands(walk_state, next_op);
 323        if (ACPI_FAILURE(status)) {
 324                return_ACPI_STATUS(status);
 325        }
 326
 327        obj_desc = acpi_ns_get_attached_object(node);
 328        if (!obj_desc) {
 329                return_ACPI_STATUS(AE_NOT_EXIST);
 330        }
 331
 332        /* Resolve the operands */
 333
 334        status =
 335            acpi_ex_resolve_operands(op->common.aml_opcode, ACPI_WALK_OPERANDS,
 336                                     walk_state);
 337        if (ACPI_FAILURE(status)) {
 338                ACPI_ERROR((AE_INFO, "(%s) bad operand(s), status 0x%X",
 339                            acpi_ps_get_opcode_name(op->common.aml_opcode),
 340                            status));
 341
 342                return_ACPI_STATUS(status);
 343        }
 344
 345        /* Initialize the Buffer Field */
 346
 347        if (op->common.aml_opcode == AML_CREATE_FIELD_OP) {
 348
 349                /* NOTE: Slightly different operands for this opcode */
 350
 351                status =
 352                    acpi_ds_init_buffer_field(op->common.aml_opcode, obj_desc,
 353                                              walk_state->operands[0],
 354                                              walk_state->operands[1],
 355                                              walk_state->operands[2],
 356                                              walk_state->operands[3]);
 357        } else {
 358                /* All other, create_xxx_field opcodes */
 359
 360                status =
 361                    acpi_ds_init_buffer_field(op->common.aml_opcode, obj_desc,
 362                                              walk_state->operands[0],
 363                                              walk_state->operands[1], NULL,
 364                                              walk_state->operands[2]);
 365        }
 366
 367        return_ACPI_STATUS(status);
 368}
 369
 370/*******************************************************************************
 371 *
 372 * FUNCTION:    acpi_ds_eval_region_operands
 373 *
 374 * PARAMETERS:  walk_state      - Current walk
 375 *              op              - A valid region Op object
 376 *
 377 * RETURN:      Status
 378 *
 379 * DESCRIPTION: Get region address and length
 380 *              Called from acpi_ds_exec_end_op during op_region parse tree walk
 381 *
 382 ******************************************************************************/
 383
 384acpi_status
 385acpi_ds_eval_region_operands(struct acpi_walk_state *walk_state,
 386                             union acpi_parse_object *op)
 387{
 388        acpi_status status;
 389        union acpi_operand_object *obj_desc;
 390        union acpi_operand_object *operand_desc;
 391        struct acpi_namespace_node *node;
 392        union acpi_parse_object *next_op;
 393
 394        ACPI_FUNCTION_TRACE_PTR(ds_eval_region_operands, op);
 395
 396        /*
 397         * This is where we evaluate the address and length fields of the
 398         * op_region declaration
 399         */
 400        node = op->common.node;
 401
 402        /* next_op points to the op that holds the space_ID */
 403
 404        next_op = op->common.value.arg;
 405
 406        /* next_op points to address op */
 407
 408        next_op = next_op->common.next;
 409
 410        /* Evaluate/create the address and length operands */
 411
 412        status = acpi_ds_create_operands(walk_state, next_op);
 413        if (ACPI_FAILURE(status)) {
 414                return_ACPI_STATUS(status);
 415        }
 416
 417        /* Resolve the length and address operands to numbers */
 418
 419        status =
 420            acpi_ex_resolve_operands(op->common.aml_opcode, ACPI_WALK_OPERANDS,
 421                                     walk_state);
 422        if (ACPI_FAILURE(status)) {
 423                return_ACPI_STATUS(status);
 424        }
 425
 426        obj_desc = acpi_ns_get_attached_object(node);
 427        if (!obj_desc) {
 428                return_ACPI_STATUS(AE_NOT_EXIST);
 429        }
 430
 431        /*
 432         * Get the length operand and save it
 433         * (at Top of stack)
 434         */
 435        operand_desc = walk_state->operands[walk_state->num_operands - 1];
 436
 437        obj_desc->region.length = (u32) operand_desc->integer.value;
 438        acpi_ut_remove_reference(operand_desc);
 439
 440        /*
 441         * Get the address and save it
 442         * (at top of stack - 1)
 443         */
 444        operand_desc = walk_state->operands[walk_state->num_operands - 2];
 445
 446        obj_desc->region.address = (acpi_physical_address)
 447            operand_desc->integer.value;
 448        acpi_ut_remove_reference(operand_desc);
 449
 450        ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "RgnObj %p Addr %8.8X%8.8X Len %X\n",
 451                          obj_desc,
 452                          ACPI_FORMAT_UINT64(obj_desc->region.address),
 453                          obj_desc->region.length));
 454
 455        /* Now the address and length are valid for this opregion */
 456
 457        obj_desc->region.flags |= AOPOBJ_DATA_VALID;
 458        return_ACPI_STATUS(status);
 459}
 460
 461/*******************************************************************************
 462 *
 463 * FUNCTION:    acpi_ds_eval_table_region_operands
 464 *
 465 * PARAMETERS:  walk_state      - Current walk
 466 *              op              - A valid region Op object
 467 *
 468 * RETURN:      Status
 469 *
 470 * DESCRIPTION: Get region address and length.
 471 *              Called from acpi_ds_exec_end_op during data_table_region parse
 472 *              tree walk.
 473 *
 474 ******************************************************************************/
 475
 476acpi_status
 477acpi_ds_eval_table_region_operands(struct acpi_walk_state *walk_state,
 478                                   union acpi_parse_object *op)
 479{
 480        acpi_status status;
 481        union acpi_operand_object *obj_desc;
 482        union acpi_operand_object **operand;
 483        struct acpi_namespace_node *node;
 484        union acpi_parse_object *next_op;
 485        struct acpi_table_header *table;
 486        u32 table_index;
 487
 488        ACPI_FUNCTION_TRACE_PTR(ds_eval_table_region_operands, op);
 489
 490        /*
 491         * This is where we evaluate the Signature string, oem_id string,
 492         * and oem_table_id string of the Data Table Region declaration
 493         */
 494        node = op->common.node;
 495
 496        /* next_op points to Signature string op */
 497
 498        next_op = op->common.value.arg;
 499
 500        /*
 501         * Evaluate/create the Signature string, oem_id string,
 502         * and oem_table_id string operands
 503         */
 504        status = acpi_ds_create_operands(walk_state, next_op);
 505        if (ACPI_FAILURE(status)) {
 506                return_ACPI_STATUS(status);
 507        }
 508
 509        operand = &walk_state->operands[0];
 510
 511        /*
 512         * Resolve the Signature string, oem_id string,
 513         * and oem_table_id string operands
 514         */
 515        status =
 516            acpi_ex_resolve_operands(op->common.aml_opcode, ACPI_WALK_OPERANDS,
 517                                     walk_state);
 518        if (ACPI_FAILURE(status)) {
 519                goto cleanup;
 520        }
 521
 522        /* Find the ACPI table */
 523
 524        status = acpi_tb_find_table(operand[0]->string.pointer,
 525                                    operand[1]->string.pointer,
 526                                    operand[2]->string.pointer, &table_index);
 527        if (ACPI_FAILURE(status)) {
 528                if (status == AE_NOT_FOUND) {
 529                        ACPI_ERROR((AE_INFO,
 530                                    "ACPI Table [%4.4s] OEM:(%s, %s) not found in RSDT/XSDT",
 531                                    operand[0]->string.pointer,
 532                                    operand[1]->string.pointer,
 533                                    operand[2]->string.pointer));
 534                }
 535                goto cleanup;
 536        }
 537
 538        status = acpi_get_table_by_index(table_index, &table);
 539        if (ACPI_FAILURE(status)) {
 540                goto cleanup;
 541        }
 542
 543        obj_desc = acpi_ns_get_attached_object(node);
 544        if (!obj_desc) {
 545                status = AE_NOT_EXIST;
 546                goto cleanup;
 547        }
 548
 549        obj_desc->region.address = ACPI_PTR_TO_PHYSADDR(table);
 550        obj_desc->region.length = table->length;
 551
 552        ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "RgnObj %p Addr %8.8X%8.8X Len %X\n",
 553                          obj_desc,
 554                          ACPI_FORMAT_UINT64(obj_desc->region.address),
 555                          obj_desc->region.length));
 556
 557        /* Now the address and length are valid for this opregion */
 558
 559        obj_desc->region.flags |= AOPOBJ_DATA_VALID;
 560
 561cleanup:
 562        acpi_ut_remove_reference(operand[0]);
 563        acpi_ut_remove_reference(operand[1]);
 564        acpi_ut_remove_reference(operand[2]);
 565
 566        return_ACPI_STATUS(status);
 567}
 568
 569/*******************************************************************************
 570 *
 571 * FUNCTION:    acpi_ds_eval_data_object_operands
 572 *
 573 * PARAMETERS:  walk_state      - Current walk
 574 *              op              - A valid data_object Op object
 575 *              obj_desc        - data_object
 576 *
 577 * RETURN:      Status
 578 *
 579 * DESCRIPTION: Get the operands and complete the following data object types:
 580 *              Buffer, Package.
 581 *
 582 ******************************************************************************/
 583
 584acpi_status
 585acpi_ds_eval_data_object_operands(struct acpi_walk_state *walk_state,
 586                                  union acpi_parse_object *op,
 587                                  union acpi_operand_object *obj_desc)
 588{
 589        acpi_status status;
 590        union acpi_operand_object *arg_desc;
 591        u32 length;
 592
 593        ACPI_FUNCTION_TRACE(ds_eval_data_object_operands);
 594
 595        /* The first operand (for all of these data objects) is the length */
 596
 597        /*
 598         * Set proper index into operand stack for acpi_ds_obj_stack_push
 599         * invoked inside acpi_ds_create_operand.
 600         */
 601        walk_state->operand_index = walk_state->num_operands;
 602
 603        status = acpi_ds_create_operand(walk_state, op->common.value.arg, 1);
 604        if (ACPI_FAILURE(status)) {
 605                return_ACPI_STATUS(status);
 606        }
 607
 608        status = acpi_ex_resolve_operands(walk_state->opcode,
 609                                          &(walk_state->
 610                                            operands[walk_state->num_operands -
 611                                                     1]), walk_state);
 612        if (ACPI_FAILURE(status)) {
 613                return_ACPI_STATUS(status);
 614        }
 615
 616        /* Extract length operand */
 617
 618        arg_desc = walk_state->operands[walk_state->num_operands - 1];
 619        length = (u32) arg_desc->integer.value;
 620
 621        /* Cleanup for length operand */
 622
 623        status = acpi_ds_obj_stack_pop(1, walk_state);
 624        if (ACPI_FAILURE(status)) {
 625                return_ACPI_STATUS(status);
 626        }
 627
 628        acpi_ut_remove_reference(arg_desc);
 629
 630        /*
 631         * Create the actual data object
 632         */
 633        switch (op->common.aml_opcode) {
 634        case AML_BUFFER_OP:
 635
 636                status =
 637                    acpi_ds_build_internal_buffer_obj(walk_state, op, length,
 638                                                      &obj_desc);
 639                break;
 640
 641        case AML_PACKAGE_OP:
 642        case AML_VAR_PACKAGE_OP:
 643
 644                status =
 645                    acpi_ds_build_internal_package_obj(walk_state, op, length,
 646                                                       &obj_desc);
 647                break;
 648
 649        default:
 650
 651                return_ACPI_STATUS(AE_AML_BAD_OPCODE);
 652        }
 653
 654        if (ACPI_SUCCESS(status)) {
 655                /*
 656                 * Return the object in the walk_state, unless the parent is a package -
 657                 * in this case, the return object will be stored in the parse tree
 658                 * for the package.
 659                 */
 660                if ((!op->common.parent) ||
 661                    ((op->common.parent->common.aml_opcode != AML_PACKAGE_OP) &&
 662                     (op->common.parent->common.aml_opcode !=
 663                      AML_VAR_PACKAGE_OP)
 664                     && (op->common.parent->common.aml_opcode !=
 665                         AML_NAME_OP))) {
 666                        walk_state->result_obj = obj_desc;
 667                }
 668        }
 669
 670        return_ACPI_STATUS(status);
 671}
 672
 673/*******************************************************************************
 674 *
 675 * FUNCTION:    acpi_ds_eval_bank_field_operands
 676 *
 677 * PARAMETERS:  walk_state      - Current walk
 678 *              op              - A valid bank_field Op object
 679 *
 680 * RETURN:      Status
 681 *
 682 * DESCRIPTION: Get bank_field bank_value
 683 *              Called from acpi_ds_exec_end_op during bank_field parse tree walk
 684 *
 685 ******************************************************************************/
 686
 687acpi_status
 688acpi_ds_eval_bank_field_operands(struct acpi_walk_state *walk_state,
 689                                 union acpi_parse_object *op)
 690{
 691        acpi_status status;
 692        union acpi_operand_object *obj_desc;
 693        union acpi_operand_object *operand_desc;
 694        struct acpi_namespace_node *node;
 695        union acpi_parse_object *next_op;
 696        union acpi_parse_object *arg;
 697
 698        ACPI_FUNCTION_TRACE_PTR(ds_eval_bank_field_operands, op);
 699
 700        /*
 701         * This is where we evaluate the bank_value field of the
 702         * bank_field declaration
 703         */
 704
 705        /* next_op points to the op that holds the Region */
 706
 707        next_op = op->common.value.arg;
 708
 709        /* next_op points to the op that holds the Bank Register */
 710
 711        next_op = next_op->common.next;
 712
 713        /* next_op points to the op that holds the Bank Value */
 714
 715        next_op = next_op->common.next;
 716
 717        /*
 718         * Set proper index into operand stack for acpi_ds_obj_stack_push
 719         * invoked inside acpi_ds_create_operand.
 720         *
 721         * We use walk_state->Operands[0] to store the evaluated bank_value
 722         */
 723        walk_state->operand_index = 0;
 724
 725        status = acpi_ds_create_operand(walk_state, next_op, 0);
 726        if (ACPI_FAILURE(status)) {
 727                return_ACPI_STATUS(status);
 728        }
 729
 730        status = acpi_ex_resolve_to_value(&walk_state->operands[0], walk_state);
 731        if (ACPI_FAILURE(status)) {
 732                return_ACPI_STATUS(status);
 733        }
 734
 735        ACPI_DUMP_OPERANDS(ACPI_WALK_OPERANDS,
 736                           acpi_ps_get_opcode_name(op->common.aml_opcode), 1);
 737        /*
 738         * Get the bank_value operand and save it
 739         * (at Top of stack)
 740         */
 741        operand_desc = walk_state->operands[0];
 742
 743        /* Arg points to the start Bank Field */
 744
 745        arg = acpi_ps_get_arg(op, 4);
 746        while (arg) {
 747
 748                /* Ignore OFFSET and ACCESSAS terms here */
 749
 750                if (arg->common.aml_opcode == AML_INT_NAMEDFIELD_OP) {
 751                        node = arg->common.node;
 752
 753                        obj_desc = acpi_ns_get_attached_object(node);
 754                        if (!obj_desc) {
 755                                return_ACPI_STATUS(AE_NOT_EXIST);
 756                        }
 757
 758                        obj_desc->bank_field.value =
 759                            (u32) operand_desc->integer.value;
 760                }
 761
 762                /* Move to next field in the list */
 763
 764                arg = arg->common.next;
 765        }
 766
 767        acpi_ut_remove_reference(operand_desc);
 768        return_ACPI_STATUS(status);
 769}
 770