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
  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 %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
 261 cleanup:
 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
 299 acpi_status
 300 acpi_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
 384 acpi_status
 385 acpi_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
 476 acpi_status
 477 acpi_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
 561 cleanup:
 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
 584 acpi_status
 585 acpi_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
 687 acpi_status
 688 acpi_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 }