Pileus Git - ~andy/linux/blob - drivers/acpi/acpica/psobject.c

   1 /******************************************************************************
   2  *
   3  * Module Name: psobject - Support for parse objects
   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
  49 #define _COMPONENT          ACPI_PARSER
  50 ACPI_MODULE_NAME("psobject")
  51
  52 /* Local prototypes */
  53 static acpi_status acpi_ps_get_aml_opcode(struct acpi_walk_state *walk_state);
  54
  55 /*******************************************************************************
  56  *
  57  * FUNCTION:    acpi_ps_get_aml_opcode
  58  *
  59  * PARAMETERS:  walk_state          - Current state
  60  *
  61  * RETURN:      Status
  62  *
  63  * DESCRIPTION: Extract the next AML opcode from the input stream.
  64  *
  65  ******************************************************************************/
  66
  67 static acpi_status acpi_ps_get_aml_opcode(struct acpi_walk_state *walk_state)
  68 {
  69
  70         ACPI_FUNCTION_TRACE_PTR(ps_get_aml_opcode, walk_state);
  71
  72         walk_state->aml_offset =
  73             (u32)ACPI_PTR_DIFF(walk_state->parser_state.aml,
  74                                walk_state->parser_state.aml_start);
  75         walk_state->opcode = acpi_ps_peek_opcode(&(walk_state->parser_state));
  76
  77         /*
  78          * First cut to determine what we have found:
  79          * 1) A valid AML opcode
  80          * 2) A name string
  81          * 3) An unknown/invalid opcode
  82          */
  83         walk_state->op_info = acpi_ps_get_opcode_info(walk_state->opcode);
  84
  85         switch (walk_state->op_info->class) {
  86         case AML_CLASS_ASCII:
  87         case AML_CLASS_PREFIX:
  88                 /*
  89                  * Starts with a valid prefix or ASCII char, this is a name
  90                  * string. Convert the bare name string to a namepath.
  91                  */
  92                 walk_state->opcode = AML_INT_NAMEPATH_OP;
  93                 walk_state->arg_types = ARGP_NAMESTRING;
  94                 break;
  95
  96         case AML_CLASS_UNKNOWN:
  97
  98                 /* The opcode is unrecognized. Complain and skip unknown opcodes */
  99
 100                 if (walk_state->pass_number == 2) {
 101                         ACPI_ERROR((AE_INFO,
 102                                     "Unknown opcode 0x%.2X at table offset 0x%.4X, ignoring",
 103                                     walk_state->opcode,
 104                                     (u32)(walk_state->aml_offset +
 105                                           sizeof(struct acpi_table_header))));
 106
 107                         ACPI_DUMP_BUFFER((walk_state->parser_state.aml - 16),
 108                                          48);
 109
 110 #ifdef ACPI_ASL_COMPILER
 111                         /*
 112                          * This is executed for the disassembler only. Output goes
 113                          * to the disassembled ASL output file.
 114                          */
 115                         acpi_os_printf
 116                             ("/*\nError: Unknown opcode 0x%.2X at table offset 0x%.4X, context:\n",
 117                              walk_state->opcode,
 118                              (u32)(walk_state->aml_offset +
 119                                    sizeof(struct acpi_table_header)));
 120
 121                         /* Dump the context surrounding the invalid opcode */
 122
 123                         acpi_ut_dump_buffer(((u8 *)walk_state->parser_state.
 124                                              aml - 16), 48, DB_BYTE_DISPLAY,
 125                                             (walk_state->aml_offset +
 126                                              sizeof(struct acpi_table_header) -
 127                                              16));
 128                         acpi_os_printf(" */\n");
 129 #endif
 130                 }
 131
 132                 /* Increment past one-byte or two-byte opcode */
 133
 134                 walk_state->parser_state.aml++;
 135                 if (walk_state->opcode > 0xFF) {        /* Can only happen if first byte is 0x5B */
 136                         walk_state->parser_state.aml++;
 137                 }
 138
 139                 return_ACPI_STATUS(AE_CTRL_PARSE_CONTINUE);
 140
 141         default:
 142
 143                 /* Found opcode info, this is a normal opcode */
 144
 145                 walk_state->parser_state.aml +=
 146                     acpi_ps_get_opcode_size(walk_state->opcode);
 147                 walk_state->arg_types = walk_state->op_info->parse_args;
 148                 break;
 149         }
 150
 151         return_ACPI_STATUS(AE_OK);
 152 }
 153
 154 /*******************************************************************************
 155  *
 156  * FUNCTION:    acpi_ps_build_named_op
 157  *
 158  * PARAMETERS:  walk_state          - Current state
 159  *              aml_op_start        - Begin of named Op in AML
 160  *              unnamed_op          - Early Op (not a named Op)
 161  *              op                  - Returned Op
 162  *
 163  * RETURN:      Status
 164  *
 165  * DESCRIPTION: Parse a named Op
 166  *
 167  ******************************************************************************/
 168
 169 acpi_status
 170 acpi_ps_build_named_op(struct acpi_walk_state *walk_state,
 171                        u8 *aml_op_start,
 172                        union acpi_parse_object *unnamed_op,
 173                        union acpi_parse_object **op)
 174 {
 175         acpi_status status = AE_OK;
 176         union acpi_parse_object *arg = NULL;
 177
 178         ACPI_FUNCTION_TRACE_PTR(ps_build_named_op, walk_state);
 179
 180         unnamed_op->common.value.arg = NULL;
 181         unnamed_op->common.arg_list_length = 0;
 182         unnamed_op->common.aml_opcode = walk_state->opcode;
 183
 184         /*
 185          * Get and append arguments until we find the node that contains
 186          * the name (the type ARGP_NAME).
 187          */
 188         while (GET_CURRENT_ARG_TYPE(walk_state->arg_types) &&
 189                (GET_CURRENT_ARG_TYPE(walk_state->arg_types) != ARGP_NAME)) {
 190                 status =
 191                     acpi_ps_get_next_arg(walk_state,
 192                                          &(walk_state->parser_state),
 193                                          GET_CURRENT_ARG_TYPE(walk_state->
 194                                                               arg_types), &arg);
 195                 if (ACPI_FAILURE(status)) {
 196                         return_ACPI_STATUS(status);
 197                 }
 198
 199                 acpi_ps_append_arg(unnamed_op, arg);
 200                 INCREMENT_ARG_LIST(walk_state->arg_types);
 201         }
 202
 203         /*
 204          * Make sure that we found a NAME and didn't run out of arguments
 205          */
 206         if (!GET_CURRENT_ARG_TYPE(walk_state->arg_types)) {
 207                 return_ACPI_STATUS(AE_AML_NO_OPERAND);
 208         }
 209
 210         /* We know that this arg is a name, move to next arg */
 211
 212         INCREMENT_ARG_LIST(walk_state->arg_types);
 213
 214         /*
 215          * Find the object. This will either insert the object into
 216          * the namespace or simply look it up
 217          */
 218         walk_state->op = NULL;
 219
 220         status = walk_state->descending_callback(walk_state, op);
 221         if (ACPI_FAILURE(status)) {
 222                 ACPI_EXCEPTION((AE_INFO, status, "During name lookup/catalog"));
 223                 return_ACPI_STATUS(status);
 224         }
 225
 226         if (!*op) {
 227                 return_ACPI_STATUS(AE_CTRL_PARSE_CONTINUE);
 228         }
 229
 230         status = acpi_ps_next_parse_state(walk_state, *op, status);
 231         if (ACPI_FAILURE(status)) {
 232                 if (status == AE_CTRL_PENDING) {
 233                         return_ACPI_STATUS(AE_CTRL_PARSE_PENDING);
 234                 }
 235                 return_ACPI_STATUS(status);
 236         }
 237
 238         acpi_ps_append_arg(*op, unnamed_op->common.value.arg);
 239
 240         if ((*op)->common.aml_opcode == AML_REGION_OP ||
 241             (*op)->common.aml_opcode == AML_DATA_REGION_OP) {
 242                 /*
 243                  * Defer final parsing of an operation_region body, because we don't
 244                  * have enough info in the first pass to parse it correctly (i.e.,
 245                  * there may be method calls within the term_arg elements of the body.)
 246                  *
 247                  * However, we must continue parsing because the opregion is not a
 248                  * standalone package -- we don't know where the end is at this point.
 249                  *
 250                  * (Length is unknown until parse of the body complete)
 251                  */
 252                 (*op)->named.data = aml_op_start;
 253                 (*op)->named.length = 0;
 254         }
 255
 256         return_ACPI_STATUS(AE_OK);
 257 }
 258
 259 /*******************************************************************************
 260  *
 261  * FUNCTION:    acpi_ps_create_op
 262  *
 263  * PARAMETERS:  walk_state          - Current state
 264  *              aml_op_start        - Op start in AML
 265  *              new_op              - Returned Op
 266  *
 267  * RETURN:      Status
 268  *
 269  * DESCRIPTION: Get Op from AML
 270  *
 271  ******************************************************************************/
 272
 273 acpi_status
 274 acpi_ps_create_op(struct acpi_walk_state *walk_state,
 275                   u8 *aml_op_start, union acpi_parse_object **new_op)
 276 {
 277         acpi_status status = AE_OK;
 278         union acpi_parse_object *op;
 279         union acpi_parse_object *named_op = NULL;
 280         union acpi_parse_object *parent_scope;
 281         u8 argument_count;
 282         const struct acpi_opcode_info *op_info;
 283
 284         ACPI_FUNCTION_TRACE_PTR(ps_create_op, walk_state);
 285
 286         status = acpi_ps_get_aml_opcode(walk_state);
 287         if (status == AE_CTRL_PARSE_CONTINUE) {
 288                 return_ACPI_STATUS(AE_CTRL_PARSE_CONTINUE);
 289         }
 290
 291         /* Create Op structure and append to parent's argument list */
 292
 293         walk_state->op_info = acpi_ps_get_opcode_info(walk_state->opcode);
 294         op = acpi_ps_alloc_op(walk_state->opcode);
 295         if (!op) {
 296                 return_ACPI_STATUS(AE_NO_MEMORY);
 297         }
 298
 299         if (walk_state->op_info->flags & AML_NAMED) {
 300                 status =
 301                     acpi_ps_build_named_op(walk_state, aml_op_start, op,
 302                                            &named_op);
 303                 acpi_ps_free_op(op);
 304                 if (ACPI_FAILURE(status)) {
 305                         return_ACPI_STATUS(status);
 306                 }
 307
 308                 *new_op = named_op;
 309                 return_ACPI_STATUS(AE_OK);
 310         }
 311
 312         /* Not a named opcode, just allocate Op and append to parent */
 313
 314         if (walk_state->op_info->flags & AML_CREATE) {
 315                 /*
 316                  * Backup to beginning of create_XXXfield declaration
 317                  * body_length is unknown until we parse the body
 318                  */
 319                 op->named.data = aml_op_start;
 320                 op->named.length = 0;
 321         }
 322
 323         if (walk_state->opcode == AML_BANK_FIELD_OP) {
 324                 /*
 325                  * Backup to beginning of bank_field declaration
 326                  * body_length is unknown until we parse the body
 327                  */
 328                 op->named.data = aml_op_start;
 329                 op->named.length = 0;
 330         }
 331
 332         parent_scope = acpi_ps_get_parent_scope(&(walk_state->parser_state));
 333         acpi_ps_append_arg(parent_scope, op);
 334
 335         if (parent_scope) {
 336                 op_info =
 337                     acpi_ps_get_opcode_info(parent_scope->common.aml_opcode);
 338                 if (op_info->flags & AML_HAS_TARGET) {
 339                         argument_count =
 340                             acpi_ps_get_argument_count(op_info->type);
 341                         if (parent_scope->common.arg_list_length >
 342                             argument_count) {
 343                                 op->common.flags |= ACPI_PARSEOP_TARGET;
 344                         }
 345                 } else if (parent_scope->common.aml_opcode == AML_INCREMENT_OP) {
 346                         op->common.flags |= ACPI_PARSEOP_TARGET;
 347                 }
 348         }
 349
 350         if (walk_state->descending_callback != NULL) {
 351                 /*
 352                  * Find the object. This will either insert the object into
 353                  * the namespace or simply look it up
 354                  */
 355                 walk_state->op = *new_op = op;
 356
 357                 status = walk_state->descending_callback(walk_state, &op);
 358                 status = acpi_ps_next_parse_state(walk_state, op, status);
 359                 if (status == AE_CTRL_PENDING) {
 360                         status = AE_CTRL_PARSE_PENDING;
 361                 }
 362         }
 363
 364         return_ACPI_STATUS(status);
 365 }
 366
 367 /*******************************************************************************
 368  *
 369  * FUNCTION:    acpi_ps_complete_op
 370  *
 371  * PARAMETERS:  walk_state          - Current state
 372  *              op                  - Returned Op
 373  *              status              - Parse status before complete Op
 374  *
 375  * RETURN:      Status
 376  *
 377  * DESCRIPTION: Complete Op
 378  *
 379  ******************************************************************************/
 380
 381 acpi_status
 382 acpi_ps_complete_op(struct acpi_walk_state *walk_state,
 383                     union acpi_parse_object **op, acpi_status status)
 384 {
 385         acpi_status status2;
 386
 387         ACPI_FUNCTION_TRACE_PTR(ps_complete_op, walk_state);
 388
 389         /*
 390          * Finished one argument of the containing scope
 391          */
 392         walk_state->parser_state.scope->parse_scope.arg_count--;
 393
 394         /* Close this Op (will result in parse subtree deletion) */
 395
 396         status2 = acpi_ps_complete_this_op(walk_state, *op);
 397         if (ACPI_FAILURE(status2)) {
 398                 return_ACPI_STATUS(status2);
 399         }
 400
 401         *op = NULL;
 402
 403         switch (status) {
 404         case AE_OK:
 405
 406                 break;
 407
 408         case AE_CTRL_TRANSFER:
 409
 410                 /* We are about to transfer to a called method */
 411
 412                 walk_state->prev_op = NULL;
 413                 walk_state->prev_arg_types = walk_state->arg_types;
 414                 return_ACPI_STATUS(status);
 415
 416         case AE_CTRL_END:
 417
 418                 acpi_ps_pop_scope(&(walk_state->parser_state), op,
 419                                   &walk_state->arg_types,
 420                                   &walk_state->arg_count);
 421
 422                 if (*op) {
 423                         walk_state->op = *op;
 424                         walk_state->op_info =
 425                             acpi_ps_get_opcode_info((*op)->common.aml_opcode);
 426                         walk_state->opcode = (*op)->common.aml_opcode;
 427
 428                         status = walk_state->ascending_callback(walk_state);
 429                         status =
 430                             acpi_ps_next_parse_state(walk_state, *op, status);
 431
 432                         status2 = acpi_ps_complete_this_op(walk_state, *op);
 433                         if (ACPI_FAILURE(status2)) {
 434                                 return_ACPI_STATUS(status2);
 435                         }
 436                 }
 437
 438                 status = AE_OK;
 439                 break;
 440
 441         case AE_CTRL_BREAK:
 442         case AE_CTRL_CONTINUE:
 443
 444                 /* Pop off scopes until we find the While */
 445
 446                 while (!(*op) || ((*op)->common.aml_opcode != AML_WHILE_OP)) {
 447                         acpi_ps_pop_scope(&(walk_state->parser_state), op,
 448                                           &walk_state->arg_types,
 449                                           &walk_state->arg_count);
 450                 }
 451
 452                 /* Close this iteration of the While loop */
 453
 454                 walk_state->op = *op;
 455                 walk_state->op_info =
 456                     acpi_ps_get_opcode_info((*op)->common.aml_opcode);
 457                 walk_state->opcode = (*op)->common.aml_opcode;
 458
 459                 status = walk_state->ascending_callback(walk_state);
 460                 status = acpi_ps_next_parse_state(walk_state, *op, status);
 461
 462                 status2 = acpi_ps_complete_this_op(walk_state, *op);
 463                 if (ACPI_FAILURE(status2)) {
 464                         return_ACPI_STATUS(status2);
 465                 }
 466
 467                 status = AE_OK;
 468                 break;
 469
 470         case AE_CTRL_TERMINATE:
 471
 472                 /* Clean up */
 473                 do {
 474                         if (*op) {
 475                                 status2 =
 476                                     acpi_ps_complete_this_op(walk_state, *op);
 477                                 if (ACPI_FAILURE(status2)) {
 478                                         return_ACPI_STATUS(status2);
 479                                 }
 480
 481                                 acpi_ut_delete_generic_state
 482                                     (acpi_ut_pop_generic_state
 483                                      (&walk_state->control_state));
 484                         }
 485
 486                         acpi_ps_pop_scope(&(walk_state->parser_state), op,
 487                                           &walk_state->arg_types,
 488                                           &walk_state->arg_count);
 489
 490                 } while (*op);
 491
 492                 return_ACPI_STATUS(AE_OK);
 493
 494         default:                /* All other non-AE_OK status */
 495
 496                 do {
 497                         if (*op) {
 498                                 status2 =
 499                                     acpi_ps_complete_this_op(walk_state, *op);
 500                                 if (ACPI_FAILURE(status2)) {
 501                                         return_ACPI_STATUS(status2);
 502                                 }
 503                         }
 504
 505                         acpi_ps_pop_scope(&(walk_state->parser_state), op,
 506                                           &walk_state->arg_types,
 507                                           &walk_state->arg_count);
 508
 509                 } while (*op);
 510
 511 #if 0
 512                 /*
 513                  * TBD: Cleanup parse ops on error
 514                  */
 515                 if (*op == NULL) {
 516                         acpi_ps_pop_scope(parser_state, op,
 517                                           &walk_state->arg_types,
 518                                           &walk_state->arg_count);
 519                 }
 520 #endif
 521                 walk_state->prev_op = NULL;
 522                 walk_state->prev_arg_types = walk_state->arg_types;
 523                 return_ACPI_STATUS(status);
 524         }
 525
 526         /* This scope complete? */
 527
 528         if (acpi_ps_has_completed_scope(&(walk_state->parser_state))) {
 529                 acpi_ps_pop_scope(&(walk_state->parser_state), op,
 530                                   &walk_state->arg_types,
 531                                   &walk_state->arg_count);
 532                 ACPI_DEBUG_PRINT((ACPI_DB_PARSE, "Popped scope, Op=%p\n", *op));
 533         } else {
 534                 *op = NULL;
 535         }
 536
 537         return_ACPI_STATUS(AE_OK);
 538 }
 539
 540 /*******************************************************************************
 541  *
 542  * FUNCTION:    acpi_ps_complete_final_op
 543  *
 544  * PARAMETERS:  walk_state          - Current state
 545  *              op                  - Current Op
 546  *              status              - Current parse status before complete last
 547  *                                    Op
 548  *
 549  * RETURN:      Status
 550  *
 551  * DESCRIPTION: Complete last Op.
 552  *
 553  ******************************************************************************/
 554
 555 acpi_status
 556 acpi_ps_complete_final_op(struct acpi_walk_state *walk_state,
 557                           union acpi_parse_object *op, acpi_status status)
 558 {
 559         acpi_status status2;
 560
 561         ACPI_FUNCTION_TRACE_PTR(ps_complete_final_op, walk_state);
 562
 563         /*
 564          * Complete the last Op (if not completed), and clear the scope stack.
 565          * It is easily possible to end an AML "package" with an unbounded number
 566          * of open scopes (such as when several ASL blocks are closed with
 567          * sequential closing braces). We want to terminate each one cleanly.
 568          */
 569         ACPI_DEBUG_PRINT((ACPI_DB_PARSE, "AML package complete at Op %p\n",
 570                           op));
 571         do {
 572                 if (op) {
 573                         if (walk_state->ascending_callback != NULL) {
 574                                 walk_state->op = op;
 575                                 walk_state->op_info =
 576                                     acpi_ps_get_opcode_info(op->common.
 577                                                             aml_opcode);
 578                                 walk_state->opcode = op->common.aml_opcode;
 579
 580                                 status =
 581                                     walk_state->ascending_callback(walk_state);
 582                                 status =
 583                                     acpi_ps_next_parse_state(walk_state, op,
 584                                                              status);
 585                                 if (status == AE_CTRL_PENDING) {
 586                                         status =
 587                                             acpi_ps_complete_op(walk_state, &op,
 588                                                                 AE_OK);
 589                                         if (ACPI_FAILURE(status)) {
 590                                                 return_ACPI_STATUS(status);
 591                                         }
 592                                 }
 593
 594                                 if (status == AE_CTRL_TERMINATE) {
 595                                         status = AE_OK;
 596
 597                                         /* Clean up */
 598                                         do {
 599                                                 if (op) {
 600                                                         status2 =
 601                                                             acpi_ps_complete_this_op
 602                                                             (walk_state, op);
 603                                                         if (ACPI_FAILURE
 604                                                             (status2)) {
 605                                                                 return_ACPI_STATUS
 606                                                                     (status2);
 607                                                         }
 608                                                 }
 609
 610                                                 acpi_ps_pop_scope(&
 611                                                                   (walk_state->
 612                                                                    parser_state),
 613                                                                   &op,
 614                                                                   &walk_state->
 615                                                                   arg_types,
 616                                                                   &walk_state->
 617                                                                   arg_count);
 618
 619                                         } while (op);
 620
 621                                         return_ACPI_STATUS(status);
 622                                 }
 623
 624                                 else if (ACPI_FAILURE(status)) {
 625
 626                                         /* First error is most important */
 627
 628                                         (void)
 629                                             acpi_ps_complete_this_op(walk_state,
 630                                                                      op);
 631                                         return_ACPI_STATUS(status);
 632                                 }
 633                         }
 634
 635                         status2 = acpi_ps_complete_this_op(walk_state, op);
 636                         if (ACPI_FAILURE(status2)) {
 637                                 return_ACPI_STATUS(status2);
 638                         }
 639                 }
 640
 641                 acpi_ps_pop_scope(&(walk_state->parser_state), &op,
 642                                   &walk_state->arg_types,
 643                                   &walk_state->arg_count);
 644
 645         } while (op);
 646
 647         return_ACPI_STATUS(status);
 648 }