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 - 2015, 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 0:
  77
  78                 /* Parse only - caller will setup callbacks */
  79
  80                 walk_state->parse_flags = ACPI_PARSE_LOAD_PASS1 |
  81                     ACPI_PARSE_DELETE_TREE | ACPI_PARSE_DISASSEMBLE;
  82                 walk_state->descending_callback = NULL;
  83                 walk_state->ascending_callback = NULL;
  84                 break;
  85
  86         case 1:
  87
  88                 /* Load pass 1 */
  89
  90                 walk_state->parse_flags = ACPI_PARSE_LOAD_PASS1 |
  91                     ACPI_PARSE_DELETE_TREE;
  92                 walk_state->descending_callback = acpi_ds_load1_begin_op;
  93                 walk_state->ascending_callback = acpi_ds_load1_end_op;
  94                 break;
  95
  96         case 2:
  97
  98                 /* Load pass 2 */
  99
 100                 walk_state->parse_flags = ACPI_PARSE_LOAD_PASS1 |
 101                     ACPI_PARSE_DELETE_TREE;
 102                 walk_state->descending_callback = acpi_ds_load2_begin_op;
 103                 walk_state->ascending_callback = acpi_ds_load2_end_op;
 104                 break;
 105
 106         case 3:
 107
 108                 /* Execution pass */
 109
 110 #ifndef ACPI_NO_METHOD_EXECUTION
 111                 walk_state->parse_flags |= ACPI_PARSE_EXECUTE |
 112                     ACPI_PARSE_DELETE_TREE;
 113                 walk_state->descending_callback = acpi_ds_exec_begin_op;
 114                 walk_state->ascending_callback = acpi_ds_exec_end_op;
 115 #endif
 116                 break;
 117
 118         default:
 119
 120                 return (AE_BAD_PARAMETER);
 121         }
 122
 123         return (AE_OK);
 124 }
 125
 126 /*******************************************************************************
 127  *
 128  * FUNCTION:    acpi_ds_load1_begin_op
 129  *
 130  * PARAMETERS:  walk_state      - Current state of the parse tree walk
 131  *              out_op          - Where to return op if a new one is created
 132  *
 133  * RETURN:      Status
 134  *
 135  * DESCRIPTION: Descending callback used during the loading of ACPI tables.
 136  *
 137  ******************************************************************************/
 138
 139 acpi_status
 140 acpi_ds_load1_begin_op(struct acpi_walk_state * walk_state,
 141                        union acpi_parse_object ** out_op)
 142 {
 143         union acpi_parse_object *op;
 144         struct acpi_namespace_node *node;
 145         acpi_status status;
 146         acpi_object_type object_type;
 147         char *path;
 148         u32 flags;
 149
 150         ACPI_FUNCTION_TRACE(ds_load1_begin_op);
 151
 152         op = walk_state->op;
 153         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "Op=%p State=%p\n", op,
 154                           walk_state));
 155
 156         /* We are only interested in opcodes that have an associated name */
 157
 158         if (op) {
 159                 if (!(walk_state->op_info->flags & AML_NAMED)) {
 160                         *out_op = op;
 161                         return_ACPI_STATUS(AE_OK);
 162                 }
 163
 164                 /* Check if this object has already been installed in the namespace */
 165
 166                 if (op->common.node) {
 167                         *out_op = op;
 168                         return_ACPI_STATUS(AE_OK);
 169                 }
 170         }
 171
 172         path = acpi_ps_get_next_namestring(&walk_state->parser_state);
 173
 174         /* Map the raw opcode into an internal object type */
 175
 176         object_type = walk_state->op_info->object_type;
 177
 178         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 179                           "State=%p Op=%p [%s]\n", walk_state, op,
 180                           acpi_ut_get_type_name(object_type)));
 181
 182         switch (walk_state->opcode) {
 183         case AML_SCOPE_OP:
 184                 /*
 185                  * The target name of the Scope() operator must exist at this point so
 186                  * that we can actually open the scope to enter new names underneath it.
 187                  * Allow search-to-root for single namesegs.
 188                  */
 189                 status =
 190                     acpi_ns_lookup(walk_state->scope_info, path, object_type,
 191                                    ACPI_IMODE_EXECUTE, ACPI_NS_SEARCH_PARENT,
 192                                    walk_state, &(node));
 193 #ifdef ACPI_ASL_COMPILER
 194                 if (status == AE_NOT_FOUND) {
 195                         /*
 196                          * Table disassembly:
 197                          * Target of Scope() not found. Generate an External for it, and
 198                          * insert the name into the namespace.
 199                          */
 200                         acpi_dm_add_op_to_external_list(op, path,
 201                                                         ACPI_TYPE_DEVICE, 0, 0);
 202                         status =
 203                             acpi_ns_lookup(walk_state->scope_info, path,
 204                                            object_type, ACPI_IMODE_LOAD_PASS1,
 205                                            ACPI_NS_SEARCH_PARENT, walk_state,
 206                                            &node);
 207                 }
 208 #endif
 209                 if (ACPI_FAILURE(status)) {
 210                         ACPI_ERROR_NAMESPACE(path, status);
 211                         return_ACPI_STATUS(status);
 212                 }
 213
 214                 /*
 215                  * Check to make sure that the target is
 216                  * one of the opcodes that actually opens a scope
 217                  */
 218                 switch (node->type) {
 219                 case ACPI_TYPE_ANY:
 220                 case ACPI_TYPE_LOCAL_SCOPE:     /* Scope  */
 221                 case ACPI_TYPE_DEVICE:
 222                 case ACPI_TYPE_POWER:
 223                 case ACPI_TYPE_PROCESSOR:
 224                 case ACPI_TYPE_THERMAL:
 225
 226                         /* These are acceptable types */
 227                         break;
 228
 229                 case ACPI_TYPE_INTEGER:
 230                 case ACPI_TYPE_STRING:
 231                 case ACPI_TYPE_BUFFER:
 232                         /*
 233                          * These types we will allow, but we will change the type.
 234                          * This enables some existing code of the form:
 235                          *
 236                          *  Name (DEB, 0)
 237                          *  Scope (DEB) { ... }
 238                          *
 239                          * Note: silently change the type here. On the second pass,
 240                          * we will report a warning
 241                          */
 242                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 243                                           "Type override - [%4.4s] had invalid type (%s) "
 244                                           "for Scope operator, changed to type ANY\n",
 245                                           acpi_ut_get_node_name(node),
 246                                           acpi_ut_get_type_name(node->type)));
 247
 248                         node->type = ACPI_TYPE_ANY;
 249                         walk_state->scope_info->common.value = ACPI_TYPE_ANY;
 250                         break;
 251
 252                 case ACPI_TYPE_METHOD:
 253                         /*
 254                          * Allow scope change to root during execution of module-level
 255                          * code. Root is typed METHOD during this time.
 256                          */
 257                         if ((node == acpi_gbl_root_node) &&
 258                             (walk_state->
 259                              parse_flags & ACPI_PARSE_MODULE_LEVEL)) {
 260                                 break;
 261                         }
 262
 263                         /*lint -fallthrough */
 264
 265                 default:
 266
 267                         /* All other types are an error */
 268
 269                         ACPI_ERROR((AE_INFO,
 270                                     "Invalid type (%s) for target of "
 271                                     "Scope operator [%4.4s] (Cannot override)",
 272                                     acpi_ut_get_type_name(node->type),
 273                                     acpi_ut_get_node_name(node)));
 274
 275                         return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 276                 }
 277                 break;
 278
 279         default:
 280                 /*
 281                  * For all other named opcodes, we will enter the name into
 282                  * the namespace.
 283                  *
 284                  * Setup the search flags.
 285                  * Since we are entering a name into the namespace, we do not want to
 286                  * enable the search-to-root upsearch.
 287                  *
 288                  * There are only two conditions where it is acceptable that the name
 289                  * already exists:
 290                  *    1) the Scope() operator can reopen a scoping object that was
 291                  *       previously defined (Scope, Method, Device, etc.)
 292                  *    2) Whenever we are parsing a deferred opcode (op_region, Buffer,
 293                  *       buffer_field, or Package), the name of the object is already
 294                  *       in the namespace.
 295                  */
 296                 if (walk_state->deferred_node) {
 297
 298                         /* This name is already in the namespace, get the node */
 299
 300                         node = walk_state->deferred_node;
 301                         status = AE_OK;
 302                         break;
 303                 }
 304
 305                 /*
 306                  * If we are executing a method, do not create any namespace objects
 307                  * during the load phase, only during execution.
 308                  */
 309                 if (walk_state->method_node) {
 310                         node = NULL;
 311                         status = AE_OK;
 312                         break;
 313                 }
 314
 315                 flags = ACPI_NS_NO_UPSEARCH;
 316                 if ((walk_state->opcode != AML_SCOPE_OP) &&
 317                     (!(walk_state->parse_flags & ACPI_PARSE_DEFERRED_OP))) {
 318                         if (walk_state->namespace_override) {
 319                                 flags |= ACPI_NS_OVERRIDE_IF_FOUND;
 320                                 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 321                                                   "[%s] Override allowed\n",
 322                                                   acpi_ut_get_type_name
 323                                                   (object_type)));
 324                         } else {
 325                                 flags |= ACPI_NS_ERROR_IF_FOUND;
 326                                 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 327                                                   "[%s] Cannot already exist\n",
 328                                                   acpi_ut_get_type_name
 329                                                   (object_type)));
 330                         }
 331                 } else {
 332                         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 333                                           "[%s] Both Find or Create allowed\n",
 334                                           acpi_ut_get_type_name(object_type)));
 335                 }
 336
 337                 /*
 338                  * Enter the named type into the internal namespace. We enter the name
 339                  * as we go downward in the parse tree. Any necessary subobjects that
 340                  * involve arguments to the opcode must be created as we go back up the
 341                  * parse tree later.
 342                  */
 343                 status =
 344                     acpi_ns_lookup(walk_state->scope_info, path, object_type,
 345                                    ACPI_IMODE_LOAD_PASS1, flags, walk_state,
 346                                    &node);
 347                 if (ACPI_FAILURE(status)) {
 348                         if (status == AE_ALREADY_EXISTS) {
 349
 350                                 /* The name already exists in this scope */
 351
 352                                 if (node->flags & ANOBJ_IS_EXTERNAL) {
 353                                         /*
 354                                          * Allow one create on an object or segment that was
 355                                          * previously declared External
 356                                          */
 357                                         node->flags &= ~ANOBJ_IS_EXTERNAL;
 358                                         node->type = (u8) object_type;
 359
 360                                         /* Just retyped a node, probably will need to open a scope */
 361
 362                                         if (acpi_ns_opens_scope(object_type)) {
 363                                                 status =
 364                                                     acpi_ds_scope_stack_push
 365                                                     (node, object_type,
 366                                                      walk_state);
 367                                                 if (ACPI_FAILURE(status)) {
 368                                                         return_ACPI_STATUS
 369                                                             (status);
 370                                                 }
 371                                         }
 372
 373                                         status = AE_OK;
 374                                 }
 375                         }
 376
 377                         if (ACPI_FAILURE(status)) {
 378                                 ACPI_ERROR_NAMESPACE(path, status);
 379                                 return_ACPI_STATUS(status);
 380                         }
 381                 }
 382                 break;
 383         }
 384
 385         /* Common exit */
 386
 387         if (!op) {
 388
 389                 /* Create a new op */
 390
 391                 op = acpi_ps_alloc_op(walk_state->opcode);
 392                 if (!op) {
 393                         return_ACPI_STATUS(AE_NO_MEMORY);
 394                 }
 395         }
 396
 397         /* Initialize the op */
 398
 399 #if (defined (ACPI_NO_METHOD_EXECUTION) || defined (ACPI_CONSTANT_EVAL_ONLY))
 400         op->named.path = ACPI_CAST_PTR(u8, path);
 401 #endif
 402
 403         if (node) {
 404                 /*
 405                  * Put the Node in the "op" object that the parser uses, so we
 406                  * can get it again quickly when this scope is closed
 407                  */
 408                 op->common.node = node;
 409                 op->named.name = node->name.integer;
 410         }
 411
 412         acpi_ps_append_arg(acpi_ps_get_parent_scope(&walk_state->parser_state),
 413                            op);
 414         *out_op = op;
 415         return_ACPI_STATUS(status);
 416 }
 417
 418 /*******************************************************************************
 419  *
 420  * FUNCTION:    acpi_ds_load1_end_op
 421  *
 422  * PARAMETERS:  walk_state      - Current state of the parse tree walk
 423  *
 424  * RETURN:      Status
 425  *
 426  * DESCRIPTION: Ascending callback used during the loading of the namespace,
 427  *              both control methods and everything else.
 428  *
 429  ******************************************************************************/
 430
 431 acpi_status acpi_ds_load1_end_op(struct acpi_walk_state *walk_state)
 432 {
 433         union acpi_parse_object *op;
 434         acpi_object_type object_type;
 435         acpi_status status = AE_OK;
 436
 437         ACPI_FUNCTION_TRACE(ds_load1_end_op);
 438
 439         op = walk_state->op;
 440         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "Op=%p State=%p\n", op,
 441                           walk_state));
 442
 443         /* We are only interested in opcodes that have an associated name */
 444
 445         if (!(walk_state->op_info->flags & (AML_NAMED | AML_FIELD))) {
 446                 return_ACPI_STATUS(AE_OK);
 447         }
 448
 449         /* Get the object type to determine if we should pop the scope */
 450
 451         object_type = walk_state->op_info->object_type;
 452
 453 #ifndef ACPI_NO_METHOD_EXECUTION
 454         if (walk_state->op_info->flags & AML_FIELD) {
 455                 /*
 456                  * If we are executing a method, do not create any namespace objects
 457                  * during the load phase, only during execution.
 458                  */
 459                 if (!walk_state->method_node) {
 460                         if (walk_state->opcode == AML_FIELD_OP ||
 461                             walk_state->opcode == AML_BANK_FIELD_OP ||
 462                             walk_state->opcode == AML_INDEX_FIELD_OP) {
 463                                 status =
 464                                     acpi_ds_init_field_objects(op, walk_state);
 465                         }
 466                 }
 467                 return_ACPI_STATUS(status);
 468         }
 469
 470         /*
 471          * If we are executing a method, do not create any namespace objects
 472          * during the load phase, only during execution.
 473          */
 474         if (!walk_state->method_node) {
 475                 if (op->common.aml_opcode == AML_REGION_OP) {
 476                         status =
 477                             acpi_ex_create_region(op->named.data,
 478                                                   op->named.length,
 479                                                   (acpi_adr_space_type) ((op->
 480                                                                           common.
 481                                                                           value.
 482                                                                           arg)->
 483                                                                          common.
 484                                                                          value.
 485                                                                          integer),
 486                                                   walk_state);
 487                         if (ACPI_FAILURE(status)) {
 488                                 return_ACPI_STATUS(status);
 489                         }
 490                 } else if (op->common.aml_opcode == AML_DATA_REGION_OP) {
 491                         status =
 492                             acpi_ex_create_region(op->named.data,
 493                                                   op->named.length,
 494                                                   ACPI_ADR_SPACE_DATA_TABLE,
 495                                                   walk_state);
 496                         if (ACPI_FAILURE(status)) {
 497                                 return_ACPI_STATUS(status);
 498                         }
 499                 }
 500         }
 501 #endif
 502
 503         if (op->common.aml_opcode == AML_NAME_OP) {
 504
 505                 /* For Name opcode, get the object type from the argument */
 506
 507                 if (op->common.value.arg) {
 508                         object_type = (acpi_ps_get_opcode_info((op->common.
 509                                                                 value.arg)->
 510                                                                common.
 511                                                                aml_opcode))->
 512                             object_type;
 513
 514                         /* Set node type if we have a namespace node */
 515
 516                         if (op->common.node) {
 517                                 op->common.node->type = (u8) object_type;
 518                         }
 519                 }
 520         }
 521
 522         /*
 523          * If we are executing a method, do not create any namespace objects
 524          * during the load phase, only during execution.
 525          */
 526         if (!walk_state->method_node) {
 527                 if (op->common.aml_opcode == AML_METHOD_OP) {
 528                         /*
 529                          * method_op pkg_length name_string method_flags term_list
 530                          *
 531                          * Note: We must create the method node/object pair as soon as we
 532                          * see the method declaration. This allows later pass1 parsing
 533                          * of invocations of the method (need to know the number of
 534                          * arguments.)
 535                          */
 536                         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 537                                           "LOADING-Method: State=%p Op=%p NamedObj=%p\n",
 538                                           walk_state, op, op->named.node));
 539
 540                         if (!acpi_ns_get_attached_object(op->named.node)) {
 541                                 walk_state->operands[0] =
 542                                     ACPI_CAST_PTR(void, op->named.node);
 543                                 walk_state->num_operands = 1;
 544
 545                                 status =
 546                                     acpi_ds_create_operands(walk_state,
 547                                                             op->common.value.
 548                                                             arg);
 549                                 if (ACPI_SUCCESS(status)) {
 550                                         status =
 551                                             acpi_ex_create_method(op->named.
 552                                                                   data,
 553                                                                   op->named.
 554                                                                   length,
 555                                                                   walk_state);
 556                                 }
 557
 558                                 walk_state->operands[0] = NULL;
 559                                 walk_state->num_operands = 0;
 560
 561                                 if (ACPI_FAILURE(status)) {
 562                                         return_ACPI_STATUS(status);
 563                                 }
 564                         }
 565                 }
 566         }
 567
 568         /* Pop the scope stack (only if loading a table) */
 569
 570         if (!walk_state->method_node && acpi_ns_opens_scope(object_type)) {
 571                 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 572                                   "(%s): Popping scope for Op %p\n",
 573                                   acpi_ut_get_type_name(object_type), op));
 574
 575                 status = acpi_ds_scope_stack_pop(walk_state);
 576         }
 577
 578         return_ACPI_STATUS(status);
 579 }