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 - 2011, 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 <acpi/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                 walk_state->parse_flags = ACPI_PARSE_LOAD_PASS1 |
  78                     ACPI_PARSE_DELETE_TREE;
  79                 walk_state->descending_callback = acpi_ds_load1_begin_op;
  80                 walk_state->ascending_callback = acpi_ds_load1_end_op;
  81                 break;
  82
  83         case 2:
  84                 walk_state->parse_flags = ACPI_PARSE_LOAD_PASS1 |
  85                     ACPI_PARSE_DELETE_TREE;
  86                 walk_state->descending_callback = acpi_ds_load2_begin_op;
  87                 walk_state->ascending_callback = acpi_ds_load2_end_op;
  88                 break;
  89
  90         case 3:
  91 #ifndef ACPI_NO_METHOD_EXECUTION
  92                 walk_state->parse_flags |= ACPI_PARSE_EXECUTE |
  93                     ACPI_PARSE_DELETE_TREE;
  94                 walk_state->descending_callback = acpi_ds_exec_begin_op;
  95                 walk_state->ascending_callback = acpi_ds_exec_end_op;
  96 #endif
  97                 break;
  98
  99         default:
 100                 return (AE_BAD_PARAMETER);
 101         }
 102
 103         return (AE_OK);
 104 }
 105
 106 /*******************************************************************************
 107  *
 108  * FUNCTION:    acpi_ds_load1_begin_op
 109  *
 110  * PARAMETERS:  walk_state      - Current state of the parse tree walk
 111  *              out_op          - Where to return op if a new one is created
 112  *
 113  * RETURN:      Status
 114  *
 115  * DESCRIPTION: Descending callback used during the loading of ACPI tables.
 116  *
 117  ******************************************************************************/
 118
 119 acpi_status
 120 acpi_ds_load1_begin_op(struct acpi_walk_state * walk_state,
 121                        union acpi_parse_object ** out_op)
 122 {
 123         union acpi_parse_object *op;
 124         struct acpi_namespace_node *node;
 125         acpi_status status;
 126         acpi_object_type object_type;
 127         char *path;
 128         u32 flags;
 129
 130         ACPI_FUNCTION_TRACE(ds_load1_begin_op);
 131
 132         op = walk_state->op;
 133         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "Op=%p State=%p\n", op,
 134                           walk_state));
 135
 136         /* We are only interested in opcodes that have an associated name */
 137
 138         if (op) {
 139                 if (!(walk_state->op_info->flags & AML_NAMED)) {
 140                         *out_op = op;
 141                         return_ACPI_STATUS(AE_OK);
 142                 }
 143
 144                 /* Check if this object has already been installed in the namespace */
 145
 146                 if (op->common.node) {
 147                         *out_op = op;
 148                         return_ACPI_STATUS(AE_OK);
 149                 }
 150         }
 151
 152         path = acpi_ps_get_next_namestring(&walk_state->parser_state);
 153
 154         /* Map the raw opcode into an internal object type */
 155
 156         object_type = walk_state->op_info->object_type;
 157
 158         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 159                           "State=%p Op=%p [%s]\n", walk_state, op,
 160                           acpi_ut_get_type_name(object_type)));
 161
 162         switch (walk_state->opcode) {
 163         case AML_SCOPE_OP:
 164
 165                 /*
 166                  * The target name of the Scope() operator must exist at this point so
 167                  * that we can actually open the scope to enter new names underneath it.
 168                  * Allow search-to-root for single namesegs.
 169                  */
 170                 status =
 171                     acpi_ns_lookup(walk_state->scope_info, path, object_type,
 172                                    ACPI_IMODE_EXECUTE, ACPI_NS_SEARCH_PARENT,
 173                                    walk_state, &(node));
 174 #ifdef ACPI_ASL_COMPILER
 175                 if (status == AE_NOT_FOUND) {
 176                         /*
 177                          * Table disassembly:
 178                          * Target of Scope() not found. Generate an External for it, and
 179                          * insert the name into the namespace.
 180                          */
 181                         acpi_dm_add_to_external_list(path, ACPI_TYPE_DEVICE, 0);
 182                         status =
 183                             acpi_ns_lookup(walk_state->scope_info, path,
 184                                            object_type, ACPI_IMODE_LOAD_PASS1,
 185                                            ACPI_NS_SEARCH_PARENT, walk_state,
 186                                            &node);
 187                 }
 188 #endif
 189                 if (ACPI_FAILURE(status)) {
 190                         ACPI_ERROR_NAMESPACE(path, status);
 191                         return_ACPI_STATUS(status);
 192                 }
 193
 194                 /*
 195                  * Check to make sure that the target is
 196                  * one of the opcodes that actually opens a scope
 197                  */
 198                 switch (node->type) {
 199                 case ACPI_TYPE_ANY:
 200                 case ACPI_TYPE_LOCAL_SCOPE:     /* Scope  */
 201                 case ACPI_TYPE_DEVICE:
 202                 case ACPI_TYPE_POWER:
 203                 case ACPI_TYPE_PROCESSOR:
 204                 case ACPI_TYPE_THERMAL:
 205
 206                         /* These are acceptable types */
 207                         break;
 208
 209                 case ACPI_TYPE_INTEGER:
 210                 case ACPI_TYPE_STRING:
 211                 case ACPI_TYPE_BUFFER:
 212
 213                         /*
 214                          * These types we will allow, but we will change the type.
 215                          * This enables some existing code of the form:
 216                          *
 217                          *  Name (DEB, 0)
 218                          *  Scope (DEB) { ... }
 219                          *
 220                          * Note: silently change the type here. On the second pass,
 221                          * we will report a warning
 222                          */
 223                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 224                                           "Type override - [%4.4s] had invalid type (%s) "
 225                                           "for Scope operator, changed to type ANY\n",
 226                                           acpi_ut_get_node_name(node),
 227                                           acpi_ut_get_type_name(node->type)));
 228
 229                         node->type = ACPI_TYPE_ANY;
 230                         walk_state->scope_info->common.value = ACPI_TYPE_ANY;
 231                         break;
 232
 233                 default:
 234
 235                         /* All other types are an error */
 236
 237                         ACPI_ERROR((AE_INFO,
 238                                     "Invalid type (%s) for target of "
 239                                     "Scope operator [%4.4s] (Cannot override)",
 240                                     acpi_ut_get_type_name(node->type),
 241                                     acpi_ut_get_node_name(node)));
 242
 243                         return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 244                 }
 245                 break;
 246
 247         default:
 248                 /*
 249                  * For all other named opcodes, we will enter the name into
 250                  * the namespace.
 251                  *
 252                  * Setup the search flags.
 253                  * Since we are entering a name into the namespace, we do not want to
 254                  * enable the search-to-root upsearch.
 255                  *
 256                  * There are only two conditions where it is acceptable that the name
 257                  * already exists:
 258                  *    1) the Scope() operator can reopen a scoping object that was
 259                  *       previously defined (Scope, Method, Device, etc.)
 260                  *    2) Whenever we are parsing a deferred opcode (op_region, Buffer,
 261                  *       buffer_field, or Package), the name of the object is already
 262                  *       in the namespace.
 263                  */
 264                 if (walk_state->deferred_node) {
 265
 266                         /* This name is already in the namespace, get the node */
 267
 268                         node = walk_state->deferred_node;
 269                         status = AE_OK;
 270                         break;
 271                 }
 272
 273                 /*
 274                  * If we are executing a method, do not create any namespace objects
 275                  * during the load phase, only during execution.
 276                  */
 277                 if (walk_state->method_node) {
 278                         node = NULL;
 279                         status = AE_OK;
 280                         break;
 281                 }
 282
 283                 flags = ACPI_NS_NO_UPSEARCH;
 284                 if ((walk_state->opcode != AML_SCOPE_OP) &&
 285                     (!(walk_state->parse_flags & ACPI_PARSE_DEFERRED_OP))) {
 286                         flags |= ACPI_NS_ERROR_IF_FOUND;
 287                         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 288                                           "[%s] Cannot already exist\n",
 289                                           acpi_ut_get_type_name(object_type)));
 290                 } else {
 291                         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 292                                           "[%s] Both Find or Create allowed\n",
 293                                           acpi_ut_get_type_name(object_type)));
 294                 }
 295
 296                 /*
 297                  * Enter the named type into the internal namespace. We enter the name
 298                  * as we go downward in the parse tree. Any necessary subobjects that
 299                  * involve arguments to the opcode must be created as we go back up the
 300                  * parse tree later.
 301                  */
 302                 status =
 303                     acpi_ns_lookup(walk_state->scope_info, path, object_type,
 304                                    ACPI_IMODE_LOAD_PASS1, flags, walk_state,
 305                                    &node);
 306                 if (ACPI_FAILURE(status)) {
 307                         if (status == AE_ALREADY_EXISTS) {
 308
 309                                 /* The name already exists in this scope */
 310
 311                                 if (node->flags & ANOBJ_IS_EXTERNAL) {
 312                                         /*
 313                                          * Allow one create on an object or segment that was
 314                                          * previously declared External
 315                                          */
 316                                         node->flags &= ~ANOBJ_IS_EXTERNAL;
 317                                         node->type = (u8) object_type;
 318
 319                                         /* Just retyped a node, probably will need to open a scope */
 320
 321                                         if (acpi_ns_opens_scope(object_type)) {
 322                                                 status =
 323                                                     acpi_ds_scope_stack_push
 324                                                     (node, object_type,
 325                                                      walk_state);
 326                                                 if (ACPI_FAILURE(status)) {
 327                                                         return_ACPI_STATUS
 328                                                             (status);
 329                                                 }
 330                                         }
 331
 332                                         status = AE_OK;
 333                                 }
 334                         }
 335
 336                         if (ACPI_FAILURE(status)) {
 337                                 ACPI_ERROR_NAMESPACE(path, status);
 338                                 return_ACPI_STATUS(status);
 339                         }
 340                 }
 341                 break;
 342         }
 343
 344         /* Common exit */
 345
 346         if (!op) {
 347
 348                 /* Create a new op */
 349
 350                 op = acpi_ps_alloc_op(walk_state->opcode);
 351                 if (!op) {
 352                         return_ACPI_STATUS(AE_NO_MEMORY);
 353                 }
 354         }
 355
 356         /* Initialize the op */
 357
 358 #if (defined (ACPI_NO_METHOD_EXECUTION) || defined (ACPI_CONSTANT_EVAL_ONLY))
 359         op->named.path = ACPI_CAST_PTR(u8, path);
 360 #endif
 361
 362         if (node) {
 363                 /*
 364                  * Put the Node in the "op" object that the parser uses, so we
 365                  * can get it again quickly when this scope is closed
 366                  */
 367                 op->common.node = node;
 368                 op->named.name = node->name.integer;
 369         }
 370
 371         acpi_ps_append_arg(acpi_ps_get_parent_scope(&walk_state->parser_state),
 372                            op);
 373         *out_op = op;
 374         return_ACPI_STATUS(status);
 375 }
 376
 377 /*******************************************************************************
 378  *
 379  * FUNCTION:    acpi_ds_load1_end_op
 380  *
 381  * PARAMETERS:  walk_state      - Current state of the parse tree walk
 382  *
 383  * RETURN:      Status
 384  *
 385  * DESCRIPTION: Ascending callback used during the loading of the namespace,
 386  *              both control methods and everything else.
 387  *
 388  ******************************************************************************/
 389
 390 acpi_status acpi_ds_load1_end_op(struct acpi_walk_state *walk_state)
 391 {
 392         union acpi_parse_object *op;
 393         acpi_object_type object_type;
 394         acpi_status status = AE_OK;
 395
 396         ACPI_FUNCTION_TRACE(ds_load1_end_op);
 397
 398         op = walk_state->op;
 399         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "Op=%p State=%p\n", op,
 400                           walk_state));
 401
 402         /* We are only interested in opcodes that have an associated name */
 403
 404         if (!(walk_state->op_info->flags & (AML_NAMED | AML_FIELD))) {
 405                 return_ACPI_STATUS(AE_OK);
 406         }
 407
 408         /* Get the object type to determine if we should pop the scope */
 409
 410         object_type = walk_state->op_info->object_type;
 411
 412 #ifndef ACPI_NO_METHOD_EXECUTION
 413         if (walk_state->op_info->flags & AML_FIELD) {
 414                 /*
 415                  * If we are executing a method, do not create any namespace objects
 416                  * during the load phase, only during execution.
 417                  */
 418                 if (!walk_state->method_node) {
 419                         if (walk_state->opcode == AML_FIELD_OP ||
 420                             walk_state->opcode == AML_BANK_FIELD_OP ||
 421                             walk_state->opcode == AML_INDEX_FIELD_OP) {
 422                                 status =
 423                                     acpi_ds_init_field_objects(op, walk_state);
 424                         }
 425                 }
 426                 return_ACPI_STATUS(status);
 427         }
 428
 429         /*
 430          * If we are executing a method, do not create any namespace objects
 431          * during the load phase, only during execution.
 432          */
 433         if (!walk_state->method_node) {
 434                 if (op->common.aml_opcode == AML_REGION_OP) {
 435                         status =
 436                             acpi_ex_create_region(op->named.data,
 437                                                   op->named.length,
 438                                                   (acpi_adr_space_type) ((op->
 439                                                                           common.
 440                                                                           value.
 441                                                                           arg)->
 442                                                                          common.
 443                                                                          value.
 444                                                                          integer),
 445                                                   walk_state);
 446                         if (ACPI_FAILURE(status)) {
 447                                 return_ACPI_STATUS(status);
 448                         }
 449                 } else if (op->common.aml_opcode == AML_DATA_REGION_OP) {
 450                         status =
 451                             acpi_ex_create_region(op->named.data,
 452                                                   op->named.length,
 453                                                   ACPI_ADR_SPACE_DATA_TABLE,
 454                                                   walk_state);
 455                         if (ACPI_FAILURE(status)) {
 456                                 return_ACPI_STATUS(status);
 457                         }
 458                 }
 459         }
 460 #endif
 461
 462         if (op->common.aml_opcode == AML_NAME_OP) {
 463
 464                 /* For Name opcode, get the object type from the argument */
 465
 466                 if (op->common.value.arg) {
 467                         object_type = (acpi_ps_get_opcode_info((op->common.
 468                                                                 value.arg)->
 469                                                                common.
 470                                                                aml_opcode))->
 471                             object_type;
 472
 473                         /* Set node type if we have a namespace node */
 474
 475                         if (op->common.node) {
 476                                 op->common.node->type = (u8) object_type;
 477                         }
 478                 }
 479         }
 480
 481         /*
 482          * If we are executing a method, do not create any namespace objects
 483          * during the load phase, only during execution.
 484          */
 485         if (!walk_state->method_node) {
 486                 if (op->common.aml_opcode == AML_METHOD_OP) {
 487                         /*
 488                          * method_op pkg_length name_string method_flags term_list
 489                          *
 490                          * Note: We must create the method node/object pair as soon as we
 491                          * see the method declaration. This allows later pass1 parsing
 492                          * of invocations of the method (need to know the number of
 493                          * arguments.)
 494                          */
 495                         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 496                                           "LOADING-Method: State=%p Op=%p NamedObj=%p\n",
 497                                           walk_state, op, op->named.node));
 498
 499                         if (!acpi_ns_get_attached_object(op->named.node)) {
 500                                 walk_state->operands[0] =
 501                                     ACPI_CAST_PTR(void, op->named.node);
 502                                 walk_state->num_operands = 1;
 503
 504                                 status =
 505                                     acpi_ds_create_operands(walk_state,
 506                                                             op->common.value.
 507                                                             arg);
 508                                 if (ACPI_SUCCESS(status)) {
 509                                         status =
 510                                             acpi_ex_create_method(op->named.
 511                                                                   data,
 512                                                                   op->named.
 513                                                                   length,
 514                                                                   walk_state);
 515                                 }
 516
 517                                 walk_state->operands[0] = NULL;
 518                                 walk_state->num_operands = 0;
 519
 520                                 if (ACPI_FAILURE(status)) {
 521                                         return_ACPI_STATUS(status);
 522                                 }
 523                         }
 524                 }
 525         }
 526
 527         /* Pop the scope stack (only if loading a table) */
 528
 529         if (!walk_state->method_node && acpi_ns_opens_scope(object_type)) {
 530                 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 531                                   "(%s): Popping scope for Op %p\n",
 532                                   acpi_ut_get_type_name(object_type), op));
 533
 534                 status = acpi_ds_scope_stack_pop(walk_state);
 535         }
 536
 537         return_ACPI_STATUS(status);
 538 }