drivers/acpi/acpica/dsfield.c

   1 /******************************************************************************
   2  *
   3  * Module Name: dsfield - Dispatcher field routines
   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 "amlcode.h"
  47 #include "acdispat.h"
  48 #include "acinterp.h"
  49 #include "acnamesp.h"
  50 #include "acparser.h"
  51
  52 #define _COMPONENT          ACPI_DISPATCHER
  53 ACPI_MODULE_NAME("dsfield")
  54
  55 /* Local prototypes */
  56 #ifdef ACPI_ASL_COMPILER
  57 #include "acdisasm.h"
  58 static acpi_status
  59 acpi_ds_create_external_region(acpi_status lookup_status,
  60                                union acpi_parse_object *op,
  61                                char *path,
  62                                struct acpi_walk_state *walk_state,
  63                                struct acpi_namespace_node **node);
  64 #endif
  65
  66 static acpi_status
  67 acpi_ds_get_field_names(struct acpi_create_field_info *info,
  68                         struct acpi_walk_state *walk_state,
  69                         union acpi_parse_object *arg);
  70
  71 #ifdef ACPI_ASL_COMPILER
  72 /*******************************************************************************
  73  *
  74  * FUNCTION:    acpi_ds_create_external_region (iASL Disassembler only)
  75  *
  76  * PARAMETERS:  lookup_status   - Status from ns_lookup operation
  77  *              op              - Op containing the Field definition and args
  78  *              path            - Pathname of the region
  79  *  `           walk_state      - Current method state
  80  *              node            - Where the new region node is returned
  81  *
  82  * RETURN:      Status
  83  *
  84  * DESCRIPTION: Add region to the external list if NOT_FOUND. Create a new
  85  *              region node/object.
  86  *
  87  ******************************************************************************/
  88
  89 static acpi_status
  90 acpi_ds_create_external_region(acpi_status lookup_status,
  91                                union acpi_parse_object *op,
  92                                char *path,
  93                                struct acpi_walk_state *walk_state,
  94                                struct acpi_namespace_node **node)
  95 {
  96         acpi_status status;
  97         union acpi_operand_object *obj_desc;
  98
  99         if (lookup_status != AE_NOT_FOUND) {
 100                 return (lookup_status);
 101         }
 102
 103         /*
 104          * Table disassembly:
 105          * operation_region not found. Generate an External for it, and
 106          * insert the name into the namespace.
 107          */
 108         acpi_dm_add_op_to_external_list(op, path, ACPI_TYPE_REGION, 0, 0);
 109
 110         status = acpi_ns_lookup(walk_state->scope_info, path, ACPI_TYPE_REGION,
 111                                 ACPI_IMODE_LOAD_PASS1, ACPI_NS_SEARCH_PARENT,
 112                                 walk_state, node);
 113         if (ACPI_FAILURE(status)) {
 114                 return (status);
 115         }
 116
 117         /* Must create and install a region object for the new node */
 118
 119         obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_REGION);
 120         if (!obj_desc) {
 121                 return (AE_NO_MEMORY);
 122         }
 123
 124         obj_desc->region.node = *node;
 125         status = acpi_ns_attach_object(*node, obj_desc, ACPI_TYPE_REGION);
 126         return (status);
 127 }
 128 #endif
 129
 130 /*******************************************************************************
 131  *
 132  * FUNCTION:    acpi_ds_create_buffer_field
 133  *
 134  * PARAMETERS:  op                  - Current parse op (create_XXField)
 135  *              walk_state          - Current state
 136  *
 137  * RETURN:      Status
 138  *
 139  * DESCRIPTION: Execute the create_field operators:
 140  *              create_bit_field_op,
 141  *              create_byte_field_op,
 142  *              create_word_field_op,
 143  *              create_dword_field_op,
 144  *              create_qword_field_op,
 145  *              create_field_op     (all of which define a field in a buffer)
 146  *
 147  ******************************************************************************/
 148
 149 acpi_status
 150 acpi_ds_create_buffer_field(union acpi_parse_object *op,
 151                             struct acpi_walk_state *walk_state)
 152 {
 153         union acpi_parse_object *arg;
 154         struct acpi_namespace_node *node;
 155         acpi_status status;
 156         union acpi_operand_object *obj_desc;
 157         union acpi_operand_object *second_desc = NULL;
 158         u32 flags;
 159
 160         ACPI_FUNCTION_TRACE(ds_create_buffer_field);
 161
 162         /*
 163          * Get the name_string argument (name of the new buffer_field)
 164          */
 165         if (op->common.aml_opcode == AML_CREATE_FIELD_OP) {
 166
 167                 /* For create_field, name is the 4th argument */
 168
 169                 arg = acpi_ps_get_arg(op, 3);
 170         } else {
 171                 /* For all other create_XXXField operators, name is the 3rd argument */
 172
 173                 arg = acpi_ps_get_arg(op, 2);
 174         }
 175
 176         if (!arg) {
 177                 return_ACPI_STATUS(AE_AML_NO_OPERAND);
 178         }
 179
 180         if (walk_state->deferred_node) {
 181                 node = walk_state->deferred_node;
 182                 status = AE_OK;
 183         } else {
 184                 /* Execute flag should always be set when this function is entered */
 185
 186                 if (!(walk_state->parse_flags & ACPI_PARSE_EXECUTE)) {
 187                         ACPI_ERROR((AE_INFO, "Parse execute mode is not set"));
 188                         return_ACPI_STATUS(AE_AML_INTERNAL);
 189                 }
 190
 191                 /* Creating new namespace node, should not already exist */
 192
 193                 flags = ACPI_NS_NO_UPSEARCH | ACPI_NS_DONT_OPEN_SCOPE |
 194                     ACPI_NS_ERROR_IF_FOUND;
 195
 196                 /*
 197                  * Mark node temporary if we are executing a normal control
 198                  * method. (Don't mark if this is a module-level code method)
 199                  */
 200                 if (walk_state->method_node &&
 201                     !(walk_state->parse_flags & ACPI_PARSE_MODULE_LEVEL)) {
 202                         flags |= ACPI_NS_TEMPORARY;
 203                 }
 204
 205                 /* Enter the name_string into the namespace */
 206
 207                 status = acpi_ns_lookup(walk_state->scope_info,
 208                                         arg->common.value.string, ACPI_TYPE_ANY,
 209                                         ACPI_IMODE_LOAD_PASS1, flags,
 210                                         walk_state, &node);
 211                 if (ACPI_FAILURE(status)) {
 212                         ACPI_ERROR_NAMESPACE(arg->common.value.string, status);
 213                         return_ACPI_STATUS(status);
 214                 }
 215         }
 216
 217         /*
 218          * We could put the returned object (Node) on the object stack for later,
 219          * but for now, we will put it in the "op" object that the parser uses,
 220          * so we can get it again at the end of this scope.
 221          */
 222         op->common.node = node;
 223
 224         /*
 225          * If there is no object attached to the node, this node was just created
 226          * and we need to create the field object. Otherwise, this was a lookup
 227          * of an existing node and we don't want to create the field object again.
 228          */
 229         obj_desc = acpi_ns_get_attached_object(node);
 230         if (obj_desc) {
 231                 return_ACPI_STATUS(AE_OK);
 232         }
 233
 234         /*
 235          * The Field definition is not fully parsed at this time.
 236          * (We must save the address of the AML for the buffer and index operands)
 237          */
 238
 239         /* Create the buffer field object */
 240
 241         obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_BUFFER_FIELD);
 242         if (!obj_desc) {
 243                 status = AE_NO_MEMORY;
 244                 goto cleanup;
 245         }
 246
 247         /*
 248          * Remember location in AML stream of the field unit opcode and operands
 249          * -- since the buffer and index operands must be evaluated.
 250          */
 251         second_desc = obj_desc->common.next_object;
 252         second_desc->extra.aml_start = op->named.data;
 253         second_desc->extra.aml_length = op->named.length;
 254         obj_desc->buffer_field.node = node;
 255
 256         /* Attach constructed field descriptors to parent node */
 257
 258         status = acpi_ns_attach_object(node, obj_desc, ACPI_TYPE_BUFFER_FIELD);
 259         if (ACPI_FAILURE(status)) {
 260                 goto cleanup;
 261         }
 262
 263 cleanup:
 264
 265         /* Remove local reference to the object */
 266
 267         acpi_ut_remove_reference(obj_desc);
 268         return_ACPI_STATUS(status);
 269 }
 270
 271 /*******************************************************************************
 272  *
 273  * FUNCTION:    acpi_ds_get_field_names
 274  *
 275  * PARAMETERS:  info            - create_field info structure
 276  *  `           walk_state      - Current method state
 277  *              arg             - First parser arg for the field name list
 278  *
 279  * RETURN:      Status
 280  *
 281  * DESCRIPTION: Process all named fields in a field declaration. Names are
 282  *              entered into the namespace.
 283  *
 284  ******************************************************************************/
 285
 286 static acpi_status
 287 acpi_ds_get_field_names(struct acpi_create_field_info *info,
 288                         struct acpi_walk_state *walk_state,
 289                         union acpi_parse_object *arg)
 290 {
 291         acpi_status status;
 292         u64 position;
 293         union acpi_parse_object *child;
 294
 295         ACPI_FUNCTION_TRACE_PTR(ds_get_field_names, info);
 296
 297         /* First field starts at bit zero */
 298
 299         info->field_bit_position = 0;
 300
 301         /* Process all elements in the field list (of parse nodes) */
 302
 303         while (arg) {
 304                 /*
 305                  * Four types of field elements are handled:
 306                  * 1) name - Enters a new named field into the namespace
 307                  * 2) offset - specifies a bit offset
 308                  * 3) access_as - changes the access mode/attributes
 309                  * 4) connection - Associate a resource template with the field
 310                  */
 311                 switch (arg->common.aml_opcode) {
 312                 case AML_INT_RESERVEDFIELD_OP:
 313
 314                         position = (u64)info->field_bit_position +
 315                             (u64)arg->common.value.size;
 316
 317                         if (position > ACPI_UINT32_MAX) {
 318                                 ACPI_ERROR((AE_INFO,
 319                                             "Bit offset within field too large (> 0xFFFFFFFF)"));
 320                                 return_ACPI_STATUS(AE_SUPPORT);
 321                         }
 322
 323                         info->field_bit_position = (u32) position;
 324                         break;
 325
 326                 case AML_INT_ACCESSFIELD_OP:
 327                 case AML_INT_EXTACCESSFIELD_OP:
 328                         /*
 329                          * Get new access_type, access_attribute, and access_length fields
 330                          * -- to be used for all field units that follow, until the
 331                          * end-of-field or another access_as keyword is encountered.
 332                          * NOTE. These three bytes are encoded in the integer value
 333                          * of the parseop for convenience.
 334                          *
 335                          * In field_flags, preserve the flag bits other than the
 336                          * ACCESS_TYPE bits.
 337                          */
 338
 339                         /* access_type (byte_acc, word_acc, etc.) */
 340
 341                         info->field_flags = (u8)
 342                             ((info->
 343                               field_flags & ~(AML_FIELD_ACCESS_TYPE_MASK)) |
 344                              ((u8)((u32)(arg->common.value.integer & 0x07))));
 345
 346                         /* access_attribute (attrib_quick, attrib_byte, etc.) */
 347
 348                         info->attribute = (u8)
 349                             ((arg->common.value.integer >> 8) & 0xFF);
 350
 351                         /* access_length (for serial/buffer protocols) */
 352
 353                         info->access_length = (u8)
 354                             ((arg->common.value.integer >> 16) & 0xFF);
 355                         break;
 356
 357                 case AML_INT_CONNECTION_OP:
 358                         /*
 359                          * Clear any previous connection. New connection is used for all
 360                          * fields that follow, similar to access_as
 361                          */
 362                         info->resource_buffer = NULL;
 363                         info->connection_node = NULL;
 364                         info->pin_number_index = 0;
 365
 366                         /*
 367                          * A Connection() is either an actual resource descriptor (buffer)
 368                          * or a named reference to a resource template
 369                          */
 370                         child = arg->common.value.arg;
 371                         if (child->common.aml_opcode == AML_INT_BYTELIST_OP) {
 372                                 info->resource_buffer = child->named.data;
 373                                 info->resource_length =
 374                                     (u16)child->named.value.integer;
 375                         } else {
 376                                 /* Lookup the Connection() namepath, it should already exist */
 377
 378                                 status = acpi_ns_lookup(walk_state->scope_info,
 379                                                         child->common.value.
 380                                                         name, ACPI_TYPE_ANY,
 381                                                         ACPI_IMODE_EXECUTE,
 382                                                         ACPI_NS_DONT_OPEN_SCOPE,
 383                                                         walk_state,
 384                                                         &info->connection_node);
 385                                 if (ACPI_FAILURE(status)) {
 386                                         ACPI_ERROR_NAMESPACE(child->common.
 387                                                              value.name,
 388                                                              status);
 389                                         return_ACPI_STATUS(status);
 390                                 }
 391                         }
 392                         break;
 393
 394                 case AML_INT_NAMEDFIELD_OP:
 395
 396                         /* Lookup the name, it should already exist */
 397
 398                         status = acpi_ns_lookup(walk_state->scope_info,
 399                                                 (char *)&arg->named.name,
 400                                                 info->field_type,
 401                                                 ACPI_IMODE_EXECUTE,
 402                                                 ACPI_NS_DONT_OPEN_SCOPE,
 403                                                 walk_state, &info->field_node);
 404                         if (ACPI_FAILURE(status)) {
 405                                 ACPI_ERROR_NAMESPACE((char *)&arg->named.name,
 406                                                      status);
 407                                 return_ACPI_STATUS(status);
 408                         } else {
 409                                 arg->common.node = info->field_node;
 410                                 info->field_bit_length = arg->common.value.size;
 411
 412                                 /*
 413                                  * If there is no object attached to the node, this node was
 414                                  * just created and we need to create the field object.
 415                                  * Otherwise, this was a lookup of an existing node and we
 416                                  * don't want to create the field object again.
 417                                  */
 418                                 if (!acpi_ns_get_attached_object
 419                                     (info->field_node)) {
 420                                         status = acpi_ex_prep_field_value(info);
 421                                         if (ACPI_FAILURE(status)) {
 422                                                 return_ACPI_STATUS(status);
 423                                         }
 424                                 }
 425                         }
 426
 427                         /* Keep track of bit position for the next field */
 428
 429                         position = (u64)info->field_bit_position +
 430                             (u64)arg->common.value.size;
 431
 432                         if (position > ACPI_UINT32_MAX) {
 433                                 ACPI_ERROR((AE_INFO,
 434                                             "Field [%4.4s] bit offset too large (> 0xFFFFFFFF)",
 435                                             ACPI_CAST_PTR(char,
 436                                                           &info->field_node->
 437                                                           name)));
 438                                 return_ACPI_STATUS(AE_SUPPORT);
 439                         }
 440
 441                         info->field_bit_position += info->field_bit_length;
 442                         info->pin_number_index++;       /* Index relative to previous Connection() */
 443                         break;
 444
 445                 default:
 446
 447                         ACPI_ERROR((AE_INFO,
 448                                     "Invalid opcode in field list: 0x%X",
 449                                     arg->common.aml_opcode));
 450                         return_ACPI_STATUS(AE_AML_BAD_OPCODE);
 451                 }
 452
 453                 arg = arg->common.next;
 454         }
 455
 456         return_ACPI_STATUS(AE_OK);
 457 }
 458
 459 /*******************************************************************************
 460  *
 461  * FUNCTION:    acpi_ds_create_field
 462  *
 463  * PARAMETERS:  op              - Op containing the Field definition and args
 464  *              region_node     - Object for the containing Operation Region
 465  *  `           walk_state      - Current method state
 466  *
 467  * RETURN:      Status
 468  *
 469  * DESCRIPTION: Create a new field in the specified operation region
 470  *
 471  ******************************************************************************/
 472
 473 acpi_status
 474 acpi_ds_create_field(union acpi_parse_object *op,
 475                      struct acpi_namespace_node *region_node,
 476                      struct acpi_walk_state *walk_state)
 477 {
 478         acpi_status status;
 479         union acpi_parse_object *arg;
 480         struct acpi_create_field_info info;
 481
 482         ACPI_FUNCTION_TRACE_PTR(ds_create_field, op);
 483
 484         /* First arg is the name of the parent op_region (must already exist) */
 485
 486         arg = op->common.value.arg;
 487
 488         if (!region_node) {
 489                 status =
 490                     acpi_ns_lookup(walk_state->scope_info,
 491                                    arg->common.value.name, ACPI_TYPE_REGION,
 492                                    ACPI_IMODE_EXECUTE, ACPI_NS_SEARCH_PARENT,
 493                                    walk_state, &region_node);
 494 #ifdef ACPI_ASL_COMPILER
 495                 status = acpi_ds_create_external_region(status, arg,
 496                                                         arg->common.value.name,
 497                                                         walk_state,
 498                                                         &region_node);
 499 #endif
 500                 if (ACPI_FAILURE(status)) {
 501                         ACPI_ERROR_NAMESPACE(arg->common.value.name, status);
 502                         return_ACPI_STATUS(status);
 503                 }
 504         }
 505
 506         memset(&info, 0, sizeof(struct acpi_create_field_info));
 507
 508         /* Second arg is the field flags */
 509
 510         arg = arg->common.next;
 511         info.field_flags = (u8) arg->common.value.integer;
 512         info.attribute = 0;
 513
 514         /* Each remaining arg is a Named Field */
 515
 516         info.field_type = ACPI_TYPE_LOCAL_REGION_FIELD;
 517         info.region_node = region_node;
 518
 519         status = acpi_ds_get_field_names(&info, walk_state, arg->common.next);
 520         return_ACPI_STATUS(status);
 521 }
 522
 523 /*******************************************************************************
 524  *
 525  * FUNCTION:    acpi_ds_init_field_objects
 526  *
 527  * PARAMETERS:  op              - Op containing the Field definition and args
 528  *  `           walk_state      - Current method state
 529  *
 530  * RETURN:      Status
 531  *
 532  * DESCRIPTION: For each "Field Unit" name in the argument list that is
 533  *              part of the field declaration, enter the name into the
 534  *              namespace.
 535  *
 536  ******************************************************************************/
 537
 538 acpi_status
 539 acpi_ds_init_field_objects(union acpi_parse_object *op,
 540                            struct acpi_walk_state *walk_state)
 541 {
 542         acpi_status status;
 543         union acpi_parse_object *arg = NULL;
 544         struct acpi_namespace_node *node;
 545         u8 type = 0;
 546         u32 flags;
 547
 548         ACPI_FUNCTION_TRACE_PTR(ds_init_field_objects, op);
 549
 550         /* Execute flag should always be set when this function is entered */
 551
 552         if (!(walk_state->parse_flags & ACPI_PARSE_EXECUTE)) {
 553                 if (walk_state->parse_flags & ACPI_PARSE_DEFERRED_OP) {
 554
 555                         /* bank_field Op is deferred, just return OK */
 556
 557                         return_ACPI_STATUS(AE_OK);
 558                 }
 559
 560                 ACPI_ERROR((AE_INFO, "Parse deferred mode is not set"));
 561                 return_ACPI_STATUS(AE_AML_INTERNAL);
 562         }
 563
 564         /*
 565          * Get the field_list argument for this opcode. This is the start of the
 566          * list of field elements.
 567          */
 568         switch (walk_state->opcode) {
 569         case AML_FIELD_OP:
 570
 571                 arg = acpi_ps_get_arg(op, 2);
 572                 type = ACPI_TYPE_LOCAL_REGION_FIELD;
 573                 break;
 574
 575         case AML_BANK_FIELD_OP:
 576
 577                 arg = acpi_ps_get_arg(op, 4);
 578                 type = ACPI_TYPE_LOCAL_BANK_FIELD;
 579                 break;
 580
 581         case AML_INDEX_FIELD_OP:
 582
 583                 arg = acpi_ps_get_arg(op, 3);
 584                 type = ACPI_TYPE_LOCAL_INDEX_FIELD;
 585                 break;
 586
 587         default:
 588
 589                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 590         }
 591
 592         /* Creating new namespace node(s), should not already exist */
 593
 594         flags = ACPI_NS_NO_UPSEARCH | ACPI_NS_DONT_OPEN_SCOPE |
 595             ACPI_NS_ERROR_IF_FOUND;
 596
 597         /*
 598          * Mark node(s) temporary if we are executing a normal control
 599          * method. (Don't mark if this is a module-level code method)
 600          */
 601         if (walk_state->method_node &&
 602             !(walk_state->parse_flags & ACPI_PARSE_MODULE_LEVEL)) {
 603                 flags |= ACPI_NS_TEMPORARY;
 604         }
 605
 606         /*
 607          * Walk the list of entries in the field_list
 608          * Note: field_list can be of zero length. In this case, Arg will be NULL.
 609          */
 610         while (arg) {
 611                 /*
 612                  * Ignore OFFSET/ACCESSAS/CONNECTION terms here; we are only interested
 613                  * in the field names in order to enter them into the namespace.
 614                  */
 615                 if (arg->common.aml_opcode == AML_INT_NAMEDFIELD_OP) {
 616                         status = acpi_ns_lookup(walk_state->scope_info,
 617                                                 (char *)&arg->named.name, type,
 618                                                 ACPI_IMODE_LOAD_PASS1, flags,
 619                                                 walk_state, &node);
 620                         if (ACPI_FAILURE(status)) {
 621                                 ACPI_ERROR_NAMESPACE((char *)&arg->named.name,
 622                                                      status);
 623                                 if (status != AE_ALREADY_EXISTS) {
 624                                         return_ACPI_STATUS(status);
 625                                 }
 626
 627                                 /* Name already exists, just ignore this error */
 628
 629                                 status = AE_OK;
 630                         }
 631
 632                         arg->common.node = node;
 633                 }
 634
 635                 /* Get the next field element in the list */
 636
 637                 arg = arg->common.next;
 638         }
 639
 640         return_ACPI_STATUS(AE_OK);
 641 }
 642
 643 /*******************************************************************************
 644  *
 645  * FUNCTION:    acpi_ds_create_bank_field
 646  *
 647  * PARAMETERS:  op              - Op containing the Field definition and args
 648  *              region_node     - Object for the containing Operation Region
 649  *              walk_state      - Current method state
 650  *
 651  * RETURN:      Status
 652  *
 653  * DESCRIPTION: Create a new bank field in the specified operation region
 654  *
 655  ******************************************************************************/
 656
 657 acpi_status
 658 acpi_ds_create_bank_field(union acpi_parse_object *op,
 659                           struct acpi_namespace_node *region_node,
 660                           struct acpi_walk_state *walk_state)
 661 {
 662         acpi_status status;
 663         union acpi_parse_object *arg;
 664         struct acpi_create_field_info info;
 665
 666         ACPI_FUNCTION_TRACE_PTR(ds_create_bank_field, op);
 667
 668         /* First arg is the name of the parent op_region (must already exist) */
 669
 670         arg = op->common.value.arg;
 671         if (!region_node) {
 672                 status =
 673                     acpi_ns_lookup(walk_state->scope_info,
 674                                    arg->common.value.name, ACPI_TYPE_REGION,
 675                                    ACPI_IMODE_EXECUTE, ACPI_NS_SEARCH_PARENT,
 676                                    walk_state, &region_node);
 677 #ifdef ACPI_ASL_COMPILER
 678                 status = acpi_ds_create_external_region(status, arg,
 679                                                         arg->common.value.name,
 680                                                         walk_state,
 681                                                         &region_node);
 682 #endif
 683                 if (ACPI_FAILURE(status)) {
 684                         ACPI_ERROR_NAMESPACE(arg->common.value.name, status);
 685                         return_ACPI_STATUS(status);
 686                 }
 687         }
 688
 689         /* Second arg is the Bank Register (Field) (must already exist) */
 690
 691         arg = arg->common.next;
 692         status =
 693             acpi_ns_lookup(walk_state->scope_info, arg->common.value.string,
 694                            ACPI_TYPE_ANY, ACPI_IMODE_EXECUTE,
 695                            ACPI_NS_SEARCH_PARENT, walk_state,
 696                            &info.register_node);
 697         if (ACPI_FAILURE(status)) {
 698                 ACPI_ERROR_NAMESPACE(arg->common.value.string, status);
 699                 return_ACPI_STATUS(status);
 700         }
 701
 702         /*
 703          * Third arg is the bank_value
 704          * This arg is a term_arg, not a constant
 705          * It will be evaluated later, by acpi_ds_eval_bank_field_operands
 706          */
 707         arg = arg->common.next;
 708
 709         /* Fourth arg is the field flags */
 710
 711         arg = arg->common.next;
 712         info.field_flags = (u8) arg->common.value.integer;
 713
 714         /* Each remaining arg is a Named Field */
 715
 716         info.field_type = ACPI_TYPE_LOCAL_BANK_FIELD;
 717         info.region_node = region_node;
 718
 719         /*
 720          * Use Info.data_register_node to store bank_field Op
 721          * It's safe because data_register_node will never be used when create
 722          * bank field \we store aml_start and aml_length in the bank_field Op for
 723          * late evaluation. Used in acpi_ex_prep_field_value(Info)
 724          *
 725          * TBD: Or, should we add a field in struct acpi_create_field_info, like
 726          * "void *ParentOp"?
 727          */
 728         info.data_register_node = (struct acpi_namespace_node *)op;
 729
 730         status = acpi_ds_get_field_names(&info, walk_state, arg->common.next);
 731         return_ACPI_STATUS(status);
 732 }
 733
 734 /*******************************************************************************
 735  *
 736  * FUNCTION:    acpi_ds_create_index_field
 737  *
 738  * PARAMETERS:  op              - Op containing the Field definition and args
 739  *              region_node     - Object for the containing Operation Region
 740  *  `           walk_state      - Current method state
 741  *
 742  * RETURN:      Status
 743  *
 744  * DESCRIPTION: Create a new index field in the specified operation region
 745  *
 746  ******************************************************************************/
 747
 748 acpi_status
 749 acpi_ds_create_index_field(union acpi_parse_object *op,
 750                            struct acpi_namespace_node *region_node,
 751                            struct acpi_walk_state *walk_state)
 752 {
 753         acpi_status status;
 754         union acpi_parse_object *arg;
 755         struct acpi_create_field_info info;
 756
 757         ACPI_FUNCTION_TRACE_PTR(ds_create_index_field, op);
 758
 759         /* First arg is the name of the Index register (must already exist) */
 760
 761         arg = op->common.value.arg;
 762         status =
 763             acpi_ns_lookup(walk_state->scope_info, arg->common.value.string,
 764                            ACPI_TYPE_ANY, ACPI_IMODE_EXECUTE,
 765                            ACPI_NS_SEARCH_PARENT, walk_state,
 766                            &info.register_node);
 767         if (ACPI_FAILURE(status)) {
 768                 ACPI_ERROR_NAMESPACE(arg->common.value.string, status);
 769                 return_ACPI_STATUS(status);
 770         }
 771
 772         /* Second arg is the data register (must already exist) */
 773
 774         arg = arg->common.next;
 775         status =
 776             acpi_ns_lookup(walk_state->scope_info, arg->common.value.string,
 777                            ACPI_TYPE_ANY, ACPI_IMODE_EXECUTE,
 778                            ACPI_NS_SEARCH_PARENT, walk_state,
 779                            &info.data_register_node);
 780         if (ACPI_FAILURE(status)) {
 781                 ACPI_ERROR_NAMESPACE(arg->common.value.string, status);
 782                 return_ACPI_STATUS(status);
 783         }
 784
 785         /* Next arg is the field flags */
 786
 787         arg = arg->common.next;
 788         info.field_flags = (u8) arg->common.value.integer;
 789
 790         /* Each remaining arg is a Named Field */
 791
 792         info.field_type = ACPI_TYPE_LOCAL_INDEX_FIELD;
 793         info.region_node = region_node;
 794
 795         status = acpi_ds_get_field_names(&info, walk_state, arg->common.next);
 796         return_ACPI_STATUS(status);
 797 }