drivers/bus/acpi/dispatcher/dswexec.c

   1 /******************************************************************************
   2  *
   3  * Module Name: dswexec - Dispatcher method execution callbacks;
   4  *                        dispatch to interpreter.
   5  *              $Revision$
   6  *
   7  *****************************************************************************/
   8
   9 /*
  10  *  Copyright (C) 2000, 2001 R. Byron Moore
  11  *
  12  *  This program is free software; you can redistribute it and/or modify
  13  *  it under the terms of the GNU General Public License as published by
  14  *  the Free Software Foundation; either version 2 of the License, or
  15  *  (at your option) any later version.
  16  *
  17  *  This program is distributed in the hope that it will be useful,
  18  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  *  GNU General Public License for more details.
  21  *
  22  *  You should have received a copy of the GNU General Public License
  23  *  along with this program; if not, write to the Free Software
  24  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  25  */
  26
  27
  28 #include "acpi.h"
  29 #include "acparser.h"
  30 #include "amlcode.h"
  31 #include "acdispat.h"
  32 #include "acinterp.h"
  33 #include "acnamesp.h"
  34 #include "acdebug.h"
  35
  36
  37 #define _COMPONENT          ACPI_DISPATCHER
  38          MODULE_NAME         ("dswexec")
  39
  40
  41 /*****************************************************************************
  42  *
  43  * FUNCTION:    Acpi_ds_get_predicate_value
  44  *
  45  * PARAMETERS:  Walk_state      - Current state of the parse tree walk
  46  *
  47  * RETURN:      Status
  48  *
  49  * DESCRIPTION: Get the result of a predicate evaluation
  50  *
  51  ****************************************************************************/
  52
  53 ACPI_STATUS
  54 acpi_ds_get_predicate_value (
  55         ACPI_WALK_STATE         *walk_state,
  56         ACPI_PARSE_OBJECT       *op,
  57         u32                     has_result_obj)
  58 {
  59         ACPI_STATUS             status = AE_OK;
  60         ACPI_OPERAND_OBJECT     *obj_desc;
  61
  62
  63         walk_state->control_state->common.state = 0;
  64
  65         if (has_result_obj) {
  66                 status = acpi_ds_result_pop (&obj_desc, walk_state);
  67                 if (ACPI_FAILURE (status)) {
  68                         return (status);
  69                 }
  70         }
  71
  72         else {
  73                 status = acpi_ds_create_operand (walk_state, op, 0);
  74                 if (ACPI_FAILURE (status)) {
  75                         return (status);
  76                 }
  77
  78                 status = acpi_aml_resolve_to_value (&walk_state->operands [0], walk_state);
  79                 if (ACPI_FAILURE (status)) {
  80                         return (status);
  81                 }
  82
  83                 obj_desc = walk_state->operands [0];
  84         }
  85
  86         if (!obj_desc) {
  87                 return (AE_AML_NO_OPERAND);
  88         }
  89
  90
  91         /*
  92          * Result of predicate evaluation currently must
  93          * be a number
  94          */
  95
  96         if (obj_desc->common.type != ACPI_TYPE_INTEGER) {
  97                 status = AE_AML_OPERAND_TYPE;
  98                 goto cleanup;
  99         }
 100
 101
 102         /* Truncate the predicate to 32-bits if necessary */
 103
 104         acpi_aml_truncate_for32bit_table (obj_desc, walk_state);
 105
 106         /*
 107          * Save the result of the predicate evaluation on
 108          * the control stack
 109          */
 110
 111         if (obj_desc->integer.value) {
 112                 walk_state->control_state->common.value = TRUE;
 113         }
 114
 115         else {
 116                 /*
 117                  * Predicate is FALSE, we will just toss the
 118                  * rest of the package
 119                  */
 120
 121                 walk_state->control_state->common.value = FALSE;
 122                 status = AE_CTRL_FALSE;
 123         }
 124
 125
 126 cleanup:
 127
 128          /* Break to debugger to display result */
 129
 130         DEBUGGER_EXEC (acpi_db_display_result_object (obj_desc, walk_state));
 131
 132         /*
 133          * Delete the predicate result object (we know that
 134          * we don't need it anymore)
 135          */
 136
 137         acpi_cm_remove_reference (obj_desc);
 138
 139         walk_state->control_state->common.state = CONTROL_NORMAL;
 140
 141         return (status);
 142 }
 143
 144
 145 /*****************************************************************************
 146  *
 147  * FUNCTION:    Acpi_ds_exec_begin_op
 148  *
 149  * PARAMETERS:  Walk_state      - Current state of the parse tree walk
 150  *              Op              - Op that has been just been reached in the
 151  *                                walk;  Arguments have not been evaluated yet.
 152  *
 153  * RETURN:      Status
 154  *
 155  * DESCRIPTION: Descending callback used during the execution of control
 156  *              methods.  This is where most operators and operands are
 157  *              dispatched to the interpreter.
 158  *
 159  ****************************************************************************/
 160
 161 ACPI_STATUS
 162 acpi_ds_exec_begin_op (
 163         u16                     opcode,
 164         ACPI_PARSE_OBJECT       *op,
 165         ACPI_WALK_STATE         *walk_state,
 166         ACPI_PARSE_OBJECT       **out_op)
 167 {
 168         ACPI_OPCODE_INFO        *op_info;
 169         ACPI_STATUS             status = AE_OK;
 170
 171
 172         if (!op) {
 173                 status = acpi_ds_load2_begin_op (opcode, NULL, walk_state, out_op);
 174                 if (ACPI_FAILURE (status)) {
 175                         return (status);
 176                 }
 177
 178                 op = *out_op;
 179         }
 180
 181         if (op == walk_state->origin) {
 182                 if (out_op) {
 183                         *out_op = op;
 184                 }
 185
 186                 return (AE_OK);
 187         }
 188
 189         /*
 190          * If the previous opcode was a conditional, this opcode
 191          * must be the beginning of the associated predicate.
 192          * Save this knowledge in the current scope descriptor
 193          */
 194
 195         if ((walk_state->control_state) &&
 196                 (walk_state->control_state->common.state ==
 197                         CONTROL_CONDITIONAL_EXECUTING)) {
 198                 walk_state->control_state->common.state = CONTROL_PREDICATE_EXECUTING;
 199
 200                 /* Save start of predicate */
 201
 202                 walk_state->control_state->control.predicate_op = op;
 203         }
 204
 205
 206         op_info = acpi_ps_get_opcode_info (op->opcode);
 207
 208         /* We want to send namepaths to the load code */
 209
 210         if (op->opcode == AML_NAMEPATH_OP) {
 211                 op_info->flags = OPTYPE_NAMED_OBJECT;
 212         }
 213
 214
 215         /*
 216          * Handle the opcode based upon the opcode type
 217          */
 218
 219         switch (ACPI_GET_OP_CLASS (op_info)) {
 220         case OPTYPE_CONTROL:
 221
 222                 status = acpi_ds_result_stack_push (walk_state);
 223                 if (ACPI_FAILURE (status)) {
 224                         return (status);
 225                 }
 226
 227                 status = acpi_ds_exec_begin_control_op (walk_state, op);
 228                 break;
 229
 230
 231         case OPTYPE_NAMED_OBJECT:
 232
 233                 if (walk_state->walk_type == WALK_METHOD) {
 234                         /*
 235                          * Found a named object declaration during method
 236                          * execution;  we must enter this object into the
 237                          * namespace.  The created object is temporary and
 238                          * will be deleted upon completion of the execution
 239                          * of this method.
 240                          */
 241
 242                         status = acpi_ds_load2_begin_op (op->opcode, op, walk_state, NULL);
 243                 }
 244
 245
 246                 if (op->opcode == AML_REGION_OP) {
 247                         status = acpi_ds_result_stack_push (walk_state);
 248                 }
 249
 250                 break;
 251
 252
 253         /* most operators with arguments */
 254
 255         case OPTYPE_MONADIC1:
 256         case OPTYPE_DYADIC1:
 257         case OPTYPE_MONADIC2:
 258         case OPTYPE_MONADIC2_r:
 259         case OPTYPE_DYADIC2:
 260         case OPTYPE_DYADIC2_r:
 261         case OPTYPE_DYADIC2_s:
 262         case OPTYPE_RECONFIGURATION:
 263         case OPTYPE_INDEX:
 264         case OPTYPE_MATCH:
 265         case OPTYPE_FATAL:
 266         case OPTYPE_CREATE_FIELD:
 267
 268                 /* Start a new result/operand state */
 269
 270                 status = acpi_ds_result_stack_push (walk_state);
 271                 break;
 272
 273
 274         default:
 275                 break;
 276         }
 277
 278         /* Nothing to do here during method execution */
 279
 280         return (status);
 281 }
 282
 283
 284 /*****************************************************************************
 285  *
 286  * FUNCTION:    Acpi_ds_exec_end_op
 287  *
 288  * PARAMETERS:  Walk_state      - Current state of the parse tree walk
 289  *              Op              - Op that has been just been completed in the
 290  *                                walk;  Arguments have now been evaluated.
 291  *
 292  * RETURN:      Status
 293  *
 294  * DESCRIPTION: Ascending callback used during the execution of control
 295  *              methods.  The only thing we really need to do here is to
 296  *              notice the beginning of IF, ELSE, and WHILE blocks.
 297  *
 298  ****************************************************************************/
 299
 300 ACPI_STATUS
 301 acpi_ds_exec_end_op (
 302         ACPI_WALK_STATE         *walk_state,
 303         ACPI_PARSE_OBJECT       *op)
 304 {
 305         ACPI_STATUS             status = AE_OK;
 306         u16                     opcode;
 307         u8                      optype;
 308         ACPI_PARSE_OBJECT       *next_op;
 309         ACPI_NAMESPACE_NODE     *node;
 310         ACPI_PARSE_OBJECT       *first_arg;
 311         ACPI_OPERAND_OBJECT     *result_obj = NULL;
 312         ACPI_OPCODE_INFO        *op_info;
 313         u32                     operand_index;
 314
 315
 316         opcode = (u16) op->opcode;
 317
 318
 319         op_info = acpi_ps_get_opcode_info (op->opcode);
 320         if (ACPI_GET_OP_TYPE (op_info) != ACPI_OP_TYPE_OPCODE) {
 321                 return (AE_NOT_IMPLEMENTED);
 322         }
 323
 324         optype = (u8) ACPI_GET_OP_CLASS (op_info);
 325         first_arg = op->value.arg;
 326
 327         /* Init the walk state */
 328
 329         walk_state->num_operands = 0;
 330         walk_state->return_desc = NULL;
 331         walk_state->op_info = op_info;
 332         walk_state->opcode = opcode;
 333
 334
 335         /* Call debugger for single step support (DEBUG build only) */
 336
 337         DEBUGGER_EXEC (status = acpi_db_single_step (walk_state, op, optype));
 338         DEBUGGER_EXEC (if (ACPI_FAILURE (status)) {return (status);});
 339
 340
 341         /* Decode the opcode */
 342
 343         switch (optype) {
 344         case OPTYPE_UNDEFINED:
 345
 346                 return (AE_NOT_IMPLEMENTED);
 347                 break;
 348
 349
 350         case OPTYPE_BOGUS:
 351                 break;
 352
 353         case OPTYPE_CONSTANT:           /* argument type only */
 354         case OPTYPE_LITERAL:            /* argument type only */
 355         case OPTYPE_DATA_TERM:          /* argument type only */
 356         case OPTYPE_LOCAL_VARIABLE:     /* argument type only */
 357         case OPTYPE_METHOD_ARGUMENT:    /* argument type only */
 358                 break;
 359
 360
 361         /* most operators with arguments */
 362
 363         case OPTYPE_MONADIC1:
 364         case OPTYPE_DYADIC1:
 365         case OPTYPE_MONADIC2:
 366         case OPTYPE_MONADIC2_r:
 367         case OPTYPE_DYADIC2:
 368         case OPTYPE_DYADIC2_r:
 369         case OPTYPE_DYADIC2_s:
 370         case OPTYPE_RECONFIGURATION:
 371         case OPTYPE_INDEX:
 372         case OPTYPE_MATCH:
 373         case OPTYPE_FATAL:
 374
 375
 376                 /* Build resolved operand stack */
 377
 378                 status = acpi_ds_create_operands (walk_state, first_arg);
 379                 if (ACPI_FAILURE (status)) {
 380                         goto cleanup;
 381                 }
 382
 383                 operand_index = walk_state->num_operands - 1;
 384
 385
 386                 /* Done with this result state (Now that operand stack is built) */
 387
 388                 status = acpi_ds_result_stack_pop (walk_state);
 389                 if (ACPI_FAILURE (status)) {
 390                         goto cleanup;
 391                 }
 392
 393                 switch (optype) {
 394                 case OPTYPE_MONADIC1:
 395
 396                         /* 1 Operand, 0 External_result, 0 Internal_result */
 397
 398                         status = acpi_aml_exec_monadic1 (opcode, walk_state);
 399                         break;
 400
 401
 402                 case OPTYPE_MONADIC2:
 403
 404                         /* 1 Operand, 0 External_result, 1 Internal_result */
 405
 406                         status = acpi_aml_exec_monadic2 (opcode, walk_state, &result_obj);
 407                         break;
 408
 409
 410                 case OPTYPE_MONADIC2_r:
 411
 412                         /* 1 Operand, 1 External_result, 1 Internal_result */
 413
 414                         status = acpi_aml_exec_monadic2_r (opcode, walk_state, &result_obj);
 415                         break;
 416
 417
 418                 case OPTYPE_DYADIC1:
 419
 420                         /* 2 Operands, 0 External_result, 0 Internal_result */
 421
 422                         status = acpi_aml_exec_dyadic1 (opcode, walk_state);
 423                         break;
 424
 425
 426                 case OPTYPE_DYADIC2:
 427
 428                         /* 2 Operands, 0 External_result, 1 Internal_result */
 429
 430                         status = acpi_aml_exec_dyadic2 (opcode, walk_state, &result_obj);
 431                         break;
 432
 433
 434                 case OPTYPE_DYADIC2_r:
 435
 436                         /* 2 Operands, 1 or 2 External_results, 1 Internal_result */
 437
 438                         status = acpi_aml_exec_dyadic2_r (opcode, walk_state, &result_obj);
 439                         break;
 440
 441
 442                 case OPTYPE_DYADIC2_s:  /* Synchronization Operator */
 443
 444                         /* 2 Operands, 0 External_result, 1 Internal_result */
 445
 446                         status = acpi_aml_exec_dyadic2_s (opcode, walk_state, &result_obj);
 447                         break;
 448
 449
 450                 case OPTYPE_INDEX:  /* Type 2 opcode with 3 operands */
 451
 452                         /* 3 Operands, 1 External_result, 1 Internal_result */
 453
 454                         status = acpi_aml_exec_index (walk_state, &result_obj);
 455                         break;
 456
 457
 458                 case OPTYPE_MATCH:  /* Type 2 opcode with 6 operands */
 459
 460                         /* 6 Operands, 0 External_result, 1 Internal_result */
 461
 462                         status = acpi_aml_exec_match (walk_state, &result_obj);
 463                         break;
 464
 465
 466                 case OPTYPE_RECONFIGURATION:
 467
 468                         /* 1 or 2 operands, 0 Internal Result */
 469
 470                         status = acpi_aml_exec_reconfiguration (opcode, walk_state);
 471                         break;
 472
 473
 474                 case OPTYPE_FATAL:
 475
 476                         /* 3 Operands, 0 External_result, 0 Internal_result */
 477
 478                         status = acpi_aml_exec_fatal (walk_state);
 479                         break;
 480                 }
 481
 482                 /*
 483                  * If a result object was returned from above, push it on the
 484                  * current result stack
 485                  */
 486                 if (ACPI_SUCCESS (status) &&
 487                         result_obj) {
 488                         status = acpi_ds_result_push (result_obj, walk_state);
 489                 }
 490
 491                 break;
 492
 493
 494         case OPTYPE_CONTROL:    /* Type 1 opcode, IF/ELSE/WHILE/NOOP */
 495
 496                 /* 1 Operand, 0 External_result, 0 Internal_result */
 497
 498                 status = acpi_ds_exec_end_control_op (walk_state, op);
 499
 500                 acpi_ds_result_stack_pop (walk_state);
 501                 break;
 502
 503
 504         case OPTYPE_METHOD_CALL:
 505
 506                 /*
 507                  * (AML_METHODCALL) Op->Value->Arg->Node contains
 508                  * the method Node pointer
 509                  */
 510                 /* Next_op points to the op that holds the method name */
 511
 512                 next_op = first_arg;
 513                 node = next_op->node;
 514
 515                 /* Next_op points to first argument op */
 516
 517                 next_op = next_op->next;
 518
 519                 /*
 520                  * Get the method's arguments and put them on the operand stack
 521                  */
 522                 status = acpi_ds_create_operands (walk_state, next_op);
 523                 if (ACPI_FAILURE (status)) {
 524                         break;
 525                 }
 526
 527                 /*
 528                  * Since the operands will be passed to another
 529                  * control method, we must resolve all local
 530                  * references here (Local variables, arguments
 531                  * to *this* method, etc.)
 532                  */
 533
 534                 status = acpi_ds_resolve_operands (walk_state);
 535                 if (ACPI_FAILURE (status)) {
 536                         break;
 537                 }
 538
 539                 /*
 540                  * Tell the walk loop to preempt this running method and
 541                  * execute the new method
 542                  */
 543                 status = AE_CTRL_TRANSFER;
 544
 545                 /*
 546                  * Return now; we don't want to disturb anything,
 547                  * especially the operand count!
 548                  */
 549                 return (status);
 550                 break;
 551
 552
 553         case OPTYPE_CREATE_FIELD:
 554
 555                 status = acpi_ds_load2_end_op (walk_state, op);
 556                 if (ACPI_FAILURE (status)) {
 557                         break;
 558                 }
 559
 560                 status = acpi_ds_eval_field_unit_operands (walk_state, op);
 561                 break;
 562
 563
 564         case OPTYPE_NAMED_OBJECT:
 565
 566                 status = acpi_ds_load2_end_op (walk_state, op);
 567                 if (ACPI_FAILURE (status)) {
 568                         break;
 569                 }
 570
 571                 switch (op->opcode) {
 572                 case AML_REGION_OP:
 573
 574                         status = acpi_ds_eval_region_operands (walk_state, op);
 575                         if (ACPI_FAILURE (status)) {
 576                                 break;
 577                         }
 578
 579                         status = acpi_ds_result_stack_pop (walk_state);
 580                         break;
 581
 582
 583                 case AML_METHOD_OP:
 584                         break;
 585
 586
 587                 case AML_ALIAS_OP:
 588
 589                         /* Alias creation was already handled by call
 590                         to psxload above */
 591                         break;
 592
 593
 594                 default:
 595                         /* Nothing needs to be done */
 596
 597                         status = AE_OK;
 598                         break;
 599                 }
 600
 601                 break;
 602
 603         default:
 604
 605                 status = AE_NOT_IMPLEMENTED;
 606                 break;
 607         }
 608
 609
 610         /*
 611          * ACPI 2.0 support for 64-bit integers:
 612          * Truncate numeric result value if we are executing from a 32-bit ACPI table
 613          */
 614         acpi_aml_truncate_for32bit_table (result_obj, walk_state);
 615
 616         /*
 617          * Check if we just completed the evaluation of a
 618          * conditional predicate
 619          */
 620
 621         if ((walk_state->control_state) &&
 622                 (walk_state->control_state->common.state ==
 623                         CONTROL_PREDICATE_EXECUTING) &&
 624                 (walk_state->control_state->control.predicate_op == op)) {
 625                 status = acpi_ds_get_predicate_value (walk_state, op, (u32) result_obj);
 626                 result_obj = NULL;
 627         }
 628
 629
 630 cleanup:
 631         if (result_obj) {
 632                 /* Break to debugger to display result */
 633
 634                 DEBUGGER_EXEC (acpi_db_display_result_object (result_obj, walk_state));
 635
 636                 /*
 637                  * Delete the result op if and only if:
 638                  * Parent will not use the result -- such as any
 639                  * non-nested type2 op in a method (parent will be method)
 640                  */
 641                 acpi_ds_delete_result_if_not_used (op, result_obj, walk_state);
 642         }
 643
 644         /* Always clear the object stack */
 645
 646         /* TBD: [Investigate] Clear stack of return value,
 647         but don't delete it */
 648         walk_state->num_operands = 0;
 649
 650         return (status);
 651 }
 652
 653