drivers/acpi/acpica/dswload.c

   1 /******************************************************************************
   2  *
   3  * Module Name: dswload - Dispatcher first pass namespace load callbacks
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2013, 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
  52 #ifdef ACPI_ASL_COMPILER
  53 #include "acdisasm.h"
  54 #endif
  55
  56 #define _COMPONENT          ACPI_DISPATCHER
  57 ACPI_MODULE_NAME("dswload")
  58
  59 /*******************************************************************************
  60  *
  61  * FUNCTION:    acpi_ds_init_callbacks
  62  *
  63  * PARAMETERS:  walk_state      - Current state of the parse tree walk
  64  *              pass_number     - 1, 2, or 3
  65  *
  66  * RETURN:      Status
  67  *
  68  * DESCRIPTION: Init walk state callbacks
  69  *
  70  ******************************************************************************/
  71 acpi_status
  72 acpi_ds_init_callbacks(struct acpi_walk_state *walk_state, u32 pass_number)
  73 {
  74
  75         switch (pass_number) {
  76         case 1:
  77
  78                 walk_state->parse_flags = ACPI_PARSE_LOAD_PASS1 |
  79                     ACPI_PARSE_DELETE_TREE;
  80                 walk_state->descending_callback = acpi_ds_load1_begin_op;
  81                 walk_state->ascending_callback = acpi_ds_load1_end_op;
  82                 break;
  83
  84         case 2:
  85
  86                 walk_state->parse_flags = ACPI_PARSE_LOAD_PASS1 |
  87                     ACPI_PARSE_DELETE_TREE;
  88                 walk_state->descending_callback = acpi_ds_load2_begin_op;
  89                 walk_state->ascending_callback = acpi_ds_load2_end_op;
  90                 break;
  91
  92         case 3:
  93
  94 #ifndef ACPI_NO_METHOD_EXECUTION
  95                 walk_state->parse_flags |= ACPI_PARSE_EXECUTE |
  96                     ACPI_PARSE_DELETE_TREE;
  97                 walk_state->descending_callback = acpi_ds_exec_begin_op;
  98                 walk_state->ascending_callback = acpi_ds_exec_end_op;
  99 #endif
 100                 break;
 101
 102         default:
 103
 104                 return (AE_BAD_PARAMETER);
 105         }
 106
 107         return (AE_OK);
 108 }
 109
 110 /*******************************************************************************
 111  *
 112  * FUNCTION:    acpi_ds_load1_begin_op
 113  *
 114  * PARAMETERS:  walk_state      - Current state of the parse tree walk
 115  *              out_op          - Where to return op if a new one is created
 116  *
 117  * RETURN:      Status
 118  *
 119  * DESCRIPTION: Descending callback used during the loading of ACPI tables.
 120  *
 121  ******************************************************************************/
 122
 123 acpi_status
 124 acpi_ds_load1_begin_op(struct acpi_walk_state * walk_state,
 125                        union acpi_parse_object ** out_op)
 126 {
 127         union acpi_parse_object *op;
 128         struct acpi_namespace_node *node;
 129         acpi_status status;
 130         acpi_object_type object_type;
 131         char *path;
 132         u32 flags;
 133
 134         ACPI_FUNCTION_TRACE(ds_load1_begin_op);
 135
 136         op = walk_state->op;
 137         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "Op=%p State=%p\n", op,
 138                           walk_state));
 139
 140         /* We are only interested in opcodes that have an associated name */
 141
 142         if (op) {
 143                 if (!(walk_state->op_info->flags & AML_NAMED)) {
 144                         *out_op = op;
 145                         return_ACPI_STATUS(AE_OK);
 146                 }
 147
 148                 /* Check if this object has already been installed in the namespace */
 149
 150                 if (op->common.node) {
 151                         *out_op = op;
 152                         return_ACPI_STATUS(AE_OK);
 153                 }
 154         }
 155
 156         path = acpi_ps_get_next_namestring(&walk_state->parser_state);
 157
 158         /* Map the raw opcode into an internal object type */
 159
 160         object_type = walk_state->op_info->object_type;
 161
 162         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 163                           "State=%p Op=%p [%s]\n", walk_state, op,
 164                           acpi_ut_get_type_name(object_type)));
 165
 166         switch (walk_state->opcode) {
 167         case AML_SCOPE_OP:
 168                 /*
 169                  * The target name of the Scope() operator must exist at this point so
 170                  * that we can actually open the scope to enter new names underneath it.
 171                  * Allow search-to-root for single namesegs.
 172                  */
 173                 status =
 174                     acpi_ns_lookup(walk_state->scope_info, path, object_type,
 175                                    ACPI_IMODE_EXECUTE, ACPI_NS_SEARCH_PARENT,
 176                                    walk_state, &(node));
 177 #ifdef ACPI_ASL_COMPILER
 178                 if (status == AE_NOT_FOUND) {
 179                         /*
 180                          * Table disassembly:
 181                          * Target of Scope() not found. Generate an External for it, and
 182                          * insert the name into the namespace.
 183                          */
 184                         acpi_dm_add_to_external_list(op, path, ACPI_TYPE_DEVICE,
 185                                                      0);
 186                         status =
 187                             acpi_ns_lookup(walk_state->scope_info, path,
 188                                            object_type, ACPI_IMODE_LOAD_PASS1,
 189                                            ACPI_NS_SEARCH_PARENT, walk_state,
 190                                            &node);
 191                 }
 192 #endif
 193                 if (ACPI_FAILURE(status)) {
 194                         ACPI_ERROR_NAMESPACE(path, status);
 195                         return_ACPI_STATUS(status);
 196                 }
 197
 198                 /*
 199                  * Check to make sure that the target is
 200                  * one of the opcodes that actually opens a scope
 201                  */
 202                 switch (node->type) {
 203                 case ACPI_TYPE_ANY:
 204                 case ACPI_TYPE_LOCAL_SCOPE:     /* Scope  */
 205                 case ACPI_TYPE_DEVICE:
 206                 case ACPI_TYPE_POWER:
 207                 case ACPI_TYPE_PROCESSOR:
 208                 case ACPI_TYPE_THERMAL:
 209
 210                         /* These are acceptable types */
 211                         break;
 212
 213                 case ACPI_TYPE_INTEGER:
 214                 case ACPI_TYPE_STRING:
 215                 case ACPI_TYPE_BUFFER:
 216                         /*
 217                          * These types we will allow, but we will change the type.
 218                          * This enables some existing code of the form:
 219                          *
 220                          *  Name (DEB, 0)
 221                          *  Scope (DEB) { ... }
 222                          *
 223                          * Note: silently change the type here. On the second pass,
 224                          * we will report a warning
 225                          */
 226                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 227                                           "Type override - [%4.4s] had invalid type (%s) "
 228                                           "for Scope operator, changed to type ANY\n",
 229                                           acpi_ut_get_node_name(node),
 230                                           acpi_ut_get_type_name(node->type)));
 231
 232                         node->type = ACPI_TYPE_ANY;
 233                         walk_state->scope_info->common.value = ACPI_TYPE_ANY;
 234                         break;
 235
 236                 case ACPI_TYPE_METHOD:
 237                         /*
 238                          * Allow scope change to root during execution of module-level
 239                          * code. Root is typed METHOD during this time.
 240                          */
 241                         if ((node == acpi_gbl_root_node) &&
 242                             (walk_state->
 243                              parse_flags & ACPI_PARSE_MODULE_LEVEL)) {
 244                                 break;
 245                         }
 246
 247                         /*lint -fallthrough */
 248
 249                 default:
 250
 251                         /* All other types are an error */
 252
 253                         ACPI_ERROR((AE_INFO,
 254                                     "Invalid type (%s) for target of "
 255                                     "Scope operator [%4.4s] (Cannot override)",
 256                                     acpi_ut_get_type_name(node->type),
 257                                     acpi_ut_get_node_name(node)));
 258
 259                         return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 260                 }
 261                 break;
 262
 263         default:
 264                 /*
 265                  * For all other named opcodes, we will enter the name into
 266                  * the namespace.
 267                  *
 268                  * Setup the search flags.
 269                  * Since we are entering a name into the namespace, we do not want to
 270                  * enable the search-to-root upsearch.
 271                  *
 272                  * There are only two conditions where it is acceptable that the name
 273                  * already exists:
 274                  *    1) the Scope() operator can reopen a scoping object that was
 275                  *       previously defined (Scope, Method, Device, etc.)
 276                  *    2) Whenever we are parsing a deferred opcode (op_region, Buffer,
 277                  *       buffer_field, or Package), the name of the object is already
 278                  *       in the namespace.
 279                  */
 280                 if (walk_state->deferred_node) {
 281
 282                         /* This name is already in the namespace, get the node */
 283
 284                         node = walk_state->deferred_node;
 285                         status = AE_OK;
 286                         break;
 287                 }
 288
 289                 /*
 290                  * If we are executing a method, do not create any namespace objects
 291                  * during the load phase, only during execution.
 292                  */
 293                 if (walk_state->method_node) {
 294                         node = NULL;
 295                         status = AE_OK;
 296                         break;
 297                 }
 298
 299                 flags = ACPI_NS_NO_UPSEARCH;
 300                 if ((walk_state->opcode != AML_SCOPE_OP) &&
 301                     (!(walk_state->parse_flags & ACPI_PARSE_DEFERRED_OP))) {
 302                         flags |= ACPI_NS_ERROR_IF_FOUND;
 303                         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 304                                           "[%s] Cannot already exist\n",
 305                                           acpi_ut_get_type_name(object_type)));
 306                 } else {
 307                         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 308                                           "[%s] Both Find or Create allowed\n",
 309                                           acpi_ut_get_type_name(object_type)));
 310                 }
 311
 312                 /*
 313                  * Enter the named type into the internal namespace. We enter the name
 314                  * as we go downward in the parse tree. Any necessary subobjects that
 315                  * involve arguments to the opcode must be created as we go back up the
 316                  * parse tree later.
 317                  */
 318                 status =
 319                     acpi_ns_lookup(walk_state->scope_info, path, object_type,
 320                                    ACPI_IMODE_LOAD_PASS1, flags, walk_state,
 321                                    &node);
 322                 if (ACPI_FAILURE(status)) {
 323                         if (status == AE_ALREADY_EXISTS) {
 324
 325                                 /* The name already exists in this scope */
 326
 327                                 if (node->flags & ANOBJ_IS_EXTERNAL) {
 328                                         /*
 329                                          * Allow one create on an object or segment that was
 330                                          * previously declared External
 331                                          */
 332                                         node->flags &= ~ANOBJ_IS_EXTERNAL;
 333                                         node->type = (u8) object_type;
 334
 335                                         /* Just retyped a node, probably will need to open a scope */
 336
 337                                         if (acpi_ns_opens_scope(object_type)) {
 338                                                 status =
 339                                                     acpi_ds_scope_stack_push
 340                                                     (node, object_type,
 341                                                      walk_state);
 342                                                 if (ACPI_FAILURE(status)) {
 343                                                         return_ACPI_STATUS
 344                                                             (status);
 345                                                 }
 346                                         }
 347
 348                                         status = AE_OK;
 349                                 }
 350                         }
 351
 352                         if (ACPI_FAILURE(status)) {
 353                                 ACPI_ERROR_NAMESPACE(path, status);
 354                                 return_ACPI_STATUS(status);
 355                         }
 356                 }
 357                 break;
 358         }
 359
 360         /* Common exit */
 361
 362         if (!op) {
 363
 364                 /* Create a new op */
 365
 366                 op = acpi_ps_alloc_op(walk_state->opcode);
 367                 if (!op) {
 368                         return_ACPI_STATUS(AE_NO_MEMORY);
 369                 }
 370         }
 371
 372         /* Initialize the op */
 373
 374 #if (defined (ACPI_NO_METHOD_EXECUTION) || defined (ACPI_CONSTANT_EVAL_ONLY))
 375         op->named.path = ACPI_CAST_PTR(u8, path);
 376 #endif
 377
 378         if (node) {
 379                 /*
 380                  * Put the Node in the "op" object that the parser uses, so we
 381                  * can get it again quickly when this scope is closed
 382                  */
 383                 op->common.node = node;
 384                 op->named.name = node->name.integer;
 385         }
 386
 387         acpi_ps_append_arg(acpi_ps_get_parent_scope(&walk_state->parser_state),
 388                            op);
 389         *out_op = op;
 390         return_ACPI_STATUS(status);
 391 }
 392
 393 /*******************************************************************************
 394  *
 395  * FUNCTION:    acpi_ds_load1_end_op
 396  *
 397  * PARAMETERS:  walk_state      - Current state of the parse tree walk
 398  *
 399  * RETURN:      Status
 400  *
 401  * DESCRIPTION: Ascending callback used during the loading of the namespace,
 402  *              both control methods and everything else.
 403  *
 404  ******************************************************************************/
 405
 406 acpi_status acpi_ds_load1_end_op(struct acpi_walk_state *walk_state)
 407 {
 408         union acpi_parse_object *op;
 409         acpi_object_type object_type;
 410         acpi_status status = AE_OK;
 411
 412         ACPI_FUNCTION_TRACE(ds_load1_end_op);
 413
 414         op = walk_state->op;
 415         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "Op=%p State=%p\n", op,
 416                           walk_state));
 417
 418         /* We are only interested in opcodes that have an associated name */
 419
 420         if (!(walk_state->op_info->flags & (AML_NAMED | AML_FIELD))) {
 421                 return_ACPI_STATUS(AE_OK);
 422         }
 423
 424         /* Get the object type to determine if we should pop the scope */
 425
 426         object_type = walk_state->op_info->object_type;
 427
 428 #ifndef ACPI_NO_METHOD_EXECUTION
 429         if (walk_state->op_info->flags & AML_FIELD) {
 430                 /*
 431                  * If we are executing a method, do not create any namespace objects
 432                  * during the load phase, only during execution.
 433                  */
 434                 if (!walk_state->method_node) {
 435                         if (walk_state->opcode == AML_FIELD_OP ||
 436                             walk_state->opcode == AML_BANK_FIELD_OP ||
 437                             walk_state->opcode == AML_INDEX_FIELD_OP) {
 438                                 status =
 439                                     acpi_ds_init_field_objects(op, walk_state);
 440                         }
 441                 }
 442                 return_ACPI_STATUS(status);
 443         }
 444
 445         /*
 446          * If we are executing a method, do not create any namespace objects
 447          * during the load phase, only during execution.
 448          */
 449         if (!walk_state->method_node) {
 450                 if (op->common.aml_opcode == AML_REGION_OP) {
 451                         status =
 452                             acpi_ex_create_region(op->named.data,
 453                                                   op->named.length,
 454                                                   (acpi_adr_space_type) ((op->
 455                                                                           common.
 456                                                                           value.
 457                                                                           arg)->
 458                                                                          common.
 459                                                                          value.
 460                                                                          integer),
 461                                                   walk_state);
 462                         if (ACPI_FAILURE(status)) {
 463                                 return_ACPI_STATUS(status);
 464                         }
 465                 } else if (op->common.aml_opcode == AML_DATA_REGION_OP) {
 466                         status =
 467                             acpi_ex_create_region(op->named.data,
 468                                                   op->named.length,
 469                                                   ACPI_ADR_SPACE_DATA_TABLE,
 470                                                   walk_state);
 471                         if (ACPI_FAILURE(status)) {
 472                                 return_ACPI_STATUS(status);
 473                         }
 474                 }
 475         }
 476 #endif
 477
 478         if (op->common.aml_opcode == AML_NAME_OP) {
 479
 480                 /* For Name opcode, get the object type from the argument */
 481
 482                 if (op->common.value.arg) {
 483                         object_type = (acpi_ps_get_opcode_info((op->common.
 484                                                                 value.arg)->
 485                                                                common.
 486                                                                aml_opcode))->
 487                             object_type;
 488
 489                         /* Set node type if we have a namespace node */
 490
 491                         if (op->common.node) {
 492                                 op->common.node->type = (u8) object_type;
 493                         }
 494                 }
 495         }
 496
 497         /*
 498          * If we are executing a method, do not create any namespace objects
 499          * during the load phase, only during execution.
 500          */
 501         if (!walk_state->method_node) {
 502                 if (op->common.aml_opcode == AML_METHOD_OP) {
 503                         /*
 504                          * method_op pkg_length name_string method_flags term_list
 505                          *
 506                          * Note: We must create the method node/object pair as soon as we
 507                          * see the method declaration. This allows later pass1 parsing
 508                          * of invocations of the method (need to know the number of
 509                          * arguments.)
 510                          */
 511                         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 512                                           "LOADING-Method: State=%p Op=%p NamedObj=%p\n",
 513                                           walk_state, op, op->named.node));
 514
 515                         if (!acpi_ns_get_attached_object(op->named.node)) {
 516                                 walk_state->operands[0] =
 517                                     ACPI_CAST_PTR(void, op->named.node);
 518                                 walk_state->num_operands = 1;
 519
 520                                 status =
 521                                     acpi_ds_create_operands(walk_state,
 522                                                             op->common.value.
 523                                                             arg);
 524                                 if (ACPI_SUCCESS(status)) {
 525                                         status =
 526                                             acpi_ex_create_method(op->named.
 527                                                                   data,
 528                                                                   op->named.
 529                                                                   length,
 530                                                                   walk_state);
 531                                 }
 532
 533                                 walk_state->operands[0] = NULL;
 534                                 walk_state->num_operands = 0;
 535
 536                                 if (ACPI_FAILURE(status)) {
 537                                         return_ACPI_STATUS(status);
 538                                 }
 539                         }
 540                 }
 541         }
 542
 543         /* Pop the scope stack (only if loading a table) */
 544
 545         if (!walk_state->method_node && acpi_ns_opens_scope(object_type)) {
 546                 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 547                                   "(%s): Popping scope for Op %p\n",
 548                                   acpi_ut_get_type_name(object_type), op));
 549
 550                 status = acpi_ds_scope_stack_pop(walk_state);
 551         }
 552
 553         return_ACPI_STATUS(status);
 554 }