err.no Git - linux-2.6/blob - drivers/acpi/executer/exoparg2.c

   1 /******************************************************************************
   2  *
   3  * Module Name: exoparg2 - AML execution - opcodes with 2 arguments
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2008, 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 <acpi/acparser.h>
  46 #include <acpi/acinterp.h>
  47 #include <acpi/acevents.h>
  48 #include <acpi/amlcode.h>
  49
  50 #define _COMPONENT          ACPI_EXECUTER
  51 ACPI_MODULE_NAME("exoparg2")
  52
  53 /*!
  54  * Naming convention for AML interpreter execution routines.
  55  *
  56  * The routines that begin execution of AML opcodes are named with a common
  57  * convention based upon the number of arguments, the number of target operands,
  58  * and whether or not a value is returned:
  59  *
  60  *      AcpiExOpcode_xA_yT_zR
  61  *
  62  * Where:
  63  *
  64  * xA - ARGUMENTS:    The number of arguments (input operands) that are
  65  *                    required for this opcode type (1 through 6 args).
  66  * yT - TARGETS:      The number of targets (output operands) that are required
  67  *                    for this opcode type (0, 1, or 2 targets).
  68  * zR - RETURN VALUE: Indicates whether this opcode type returns a value
  69  *                    as the function return (0 or 1).
  70  *
  71  * The AcpiExOpcode* functions are called via the Dispatcher component with
  72  * fully resolved operands.
  73 !*/
  74 /*******************************************************************************
  75  *
  76  * FUNCTION:    acpi_ex_opcode_2A_0T_0R
  77  *
  78  * PARAMETERS:  walk_state          - Current walk state
  79  *
  80  * RETURN:      Status
  81  *
  82  * DESCRIPTION: Execute opcode with two arguments, no target, and no return
  83  *              value.
  84  *
  85  * ALLOCATION:  Deletes both operands
  86  *
  87  ******************************************************************************/
  88 acpi_status acpi_ex_opcode_2A_0T_0R(struct acpi_walk_state *walk_state)
  89 {
  90         union acpi_operand_object **operand = &walk_state->operands[0];
  91         struct acpi_namespace_node *node;
  92         u32 value;
  93         acpi_status status = AE_OK;
  94
  95         ACPI_FUNCTION_TRACE_STR(ex_opcode_2A_0T_0R,
  96                                 acpi_ps_get_opcode_name(walk_state->opcode));
  97
  98         /* Examine the opcode */
  99
 100         switch (walk_state->opcode) {
 101         case AML_NOTIFY_OP:     /* Notify (notify_object, notify_value) */
 102
 103                 /* The first operand is a namespace node */
 104
 105                 node = (struct acpi_namespace_node *)operand[0];
 106
 107                 /* Second value is the notify value */
 108
 109                 value = (u32) operand[1]->integer.value;
 110
 111                 /* Are notifies allowed on this object? */
 112
 113                 if (!acpi_ev_is_notify_object(node)) {
 114                         ACPI_ERROR((AE_INFO,
 115                                     "Unexpected notify object type [%s]",
 116                                     acpi_ut_get_type_name(node->type)));
 117
 118                         status = AE_AML_OPERAND_TYPE;
 119                         break;
 120                 }
 121 #ifdef ACPI_GPE_NOTIFY_CHECK
 122                 /*
 123                  * GPE method wake/notify check.  Here, we want to ensure that we
 124                  * don't receive any "DeviceWake" Notifies from a GPE _Lxx or _Exx
 125                  * GPE method during system runtime.  If we do, the GPE is marked
 126                  * as "wake-only" and disabled.
 127                  *
 128                  * 1) Is the Notify() value == device_wake?
 129                  * 2) Is this a GPE deferred method?  (An _Lxx or _Exx method)
 130                  * 3) Did the original GPE happen at system runtime?
 131                  *    (versus during wake)
 132                  *
 133                  * If all three cases are true, this is a wake-only GPE that should
 134                  * be disabled at runtime.
 135                  */
 136                 if (value == 2) {       /* device_wake */
 137                         status =
 138                             acpi_ev_check_for_wake_only_gpe(walk_state->
 139                                                             gpe_event_info);
 140                         if (ACPI_FAILURE(status)) {
 141
 142                                 /* AE_WAKE_ONLY_GPE only error, means ignore this notify */
 143
 144                                 return_ACPI_STATUS(AE_OK)
 145                         }
 146                 }
 147 #endif
 148
 149                 /*
 150                  * Dispatch the notify to the appropriate handler
 151                  * NOTE: the request is queued for execution after this method
 152                  * completes.  The notify handlers are NOT invoked synchronously
 153                  * from this thread -- because handlers may in turn run other
 154                  * control methods.
 155                  */
 156                 status = acpi_ev_queue_notify_request(node, value);
 157                 break;
 158
 159         default:
 160
 161                 ACPI_ERROR((AE_INFO, "Unknown AML opcode %X",
 162                             walk_state->opcode));
 163                 status = AE_AML_BAD_OPCODE;
 164         }
 165
 166         return_ACPI_STATUS(status);
 167 }
 168
 169 /*******************************************************************************
 170  *
 171  * FUNCTION:    acpi_ex_opcode_2A_2T_1R
 172  *
 173  * PARAMETERS:  walk_state          - Current walk state
 174  *
 175  * RETURN:      Status
 176  *
 177  * DESCRIPTION: Execute a dyadic operator (2 operands) with 2 output targets
 178  *              and one implicit return value.
 179  *
 180  ******************************************************************************/
 181
 182 acpi_status acpi_ex_opcode_2A_2T_1R(struct acpi_walk_state *walk_state)
 183 {
 184         union acpi_operand_object **operand = &walk_state->operands[0];
 185         union acpi_operand_object *return_desc1 = NULL;
 186         union acpi_operand_object *return_desc2 = NULL;
 187         acpi_status status;
 188
 189         ACPI_FUNCTION_TRACE_STR(ex_opcode_2A_2T_1R,
 190                                 acpi_ps_get_opcode_name(walk_state->opcode));
 191
 192         /* Execute the opcode */
 193
 194         switch (walk_state->opcode) {
 195         case AML_DIVIDE_OP:
 196
 197                 /* Divide (Dividend, Divisor, remainder_result quotient_result) */
 198
 199                 return_desc1 =
 200                     acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
 201                 if (!return_desc1) {
 202                         status = AE_NO_MEMORY;
 203                         goto cleanup;
 204                 }
 205
 206                 return_desc2 =
 207                     acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
 208                 if (!return_desc2) {
 209                         status = AE_NO_MEMORY;
 210                         goto cleanup;
 211                 }
 212
 213                 /* Quotient to return_desc1, remainder to return_desc2 */
 214
 215                 status = acpi_ut_divide(operand[0]->integer.value,
 216                                         operand[1]->integer.value,
 217                                         &return_desc1->integer.value,
 218                                         &return_desc2->integer.value);
 219                 if (ACPI_FAILURE(status)) {
 220                         goto cleanup;
 221                 }
 222                 break;
 223
 224         default:
 225
 226                 ACPI_ERROR((AE_INFO, "Unknown AML opcode %X",
 227                             walk_state->opcode));
 228                 status = AE_AML_BAD_OPCODE;
 229                 goto cleanup;
 230         }
 231
 232         /* Store the results to the target reference operands */
 233
 234         status = acpi_ex_store(return_desc2, operand[2], walk_state);
 235         if (ACPI_FAILURE(status)) {
 236                 goto cleanup;
 237         }
 238
 239         status = acpi_ex_store(return_desc1, operand[3], walk_state);
 240         if (ACPI_FAILURE(status)) {
 241                 goto cleanup;
 242         }
 243
 244       cleanup:
 245         /*
 246          * Since the remainder is not returned indirectly, remove a reference to
 247          * it. Only the quotient is returned indirectly.
 248          */
 249         acpi_ut_remove_reference(return_desc2);
 250
 251         if (ACPI_FAILURE(status)) {
 252
 253                 /* Delete the return object */
 254
 255                 acpi_ut_remove_reference(return_desc1);
 256         }
 257
 258         /* Save return object (the remainder) on success */
 259
 260         else {
 261                 walk_state->result_obj = return_desc1;
 262         }
 263
 264         return_ACPI_STATUS(status);
 265 }
 266
 267 /*******************************************************************************
 268  *
 269  * FUNCTION:    acpi_ex_opcode_2A_1T_1R
 270  *
 271  * PARAMETERS:  walk_state          - Current walk state
 272  *
 273  * RETURN:      Status
 274  *
 275  * DESCRIPTION: Execute opcode with two arguments, one target, and a return
 276  *              value.
 277  *
 278  ******************************************************************************/
 279
 280 acpi_status acpi_ex_opcode_2A_1T_1R(struct acpi_walk_state *walk_state)
 281 {
 282         union acpi_operand_object **operand = &walk_state->operands[0];
 283         union acpi_operand_object *return_desc = NULL;
 284         acpi_integer index;
 285         acpi_status status = AE_OK;
 286         acpi_size length;
 287
 288         ACPI_FUNCTION_TRACE_STR(ex_opcode_2A_1T_1R,
 289                                 acpi_ps_get_opcode_name(walk_state->opcode));
 290
 291         /* Execute the opcode */
 292
 293         if (walk_state->op_info->flags & AML_MATH) {
 294
 295                 /* All simple math opcodes (add, etc.) */
 296
 297                 return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
 298                 if (!return_desc) {
 299                         status = AE_NO_MEMORY;
 300                         goto cleanup;
 301                 }
 302
 303                 return_desc->integer.value =
 304                     acpi_ex_do_math_op(walk_state->opcode,
 305                                        operand[0]->integer.value,
 306                                        operand[1]->integer.value);
 307                 goto store_result_to_target;
 308         }
 309
 310         switch (walk_state->opcode) {
 311         case AML_MOD_OP:        /* Mod (Dividend, Divisor, remainder_result (ACPI 2.0) */
 312
 313                 return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
 314                 if (!return_desc) {
 315                         status = AE_NO_MEMORY;
 316                         goto cleanup;
 317                 }
 318
 319                 /* return_desc will contain the remainder */
 320
 321                 status = acpi_ut_divide(operand[0]->integer.value,
 322                                         operand[1]->integer.value,
 323                                         NULL, &return_desc->integer.value);
 324                 break;
 325
 326         case AML_CONCAT_OP:     /* Concatenate (Data1, Data2, Result) */
 327
 328                 status = acpi_ex_do_concatenate(operand[0], operand[1],
 329                                                 &return_desc, walk_state);
 330                 break;
 331
 332         case AML_TO_STRING_OP:  /* to_string (Buffer, Length, Result) (ACPI 2.0) */
 333
 334                 /*
 335                  * Input object is guaranteed to be a buffer at this point (it may have
 336                  * been converted.)  Copy the raw buffer data to a new object of
 337                  * type String.
 338                  */
 339
 340                 /*
 341                  * Get the length of the new string. It is the smallest of:
 342                  * 1) Length of the input buffer
 343                  * 2) Max length as specified in the to_string operator
 344                  * 3) Length of input buffer up to a zero byte (null terminator)
 345                  *
 346                  * NOTE: A length of zero is ok, and will create a zero-length, null
 347                  *       terminated string.
 348                  */
 349                 length = 0;
 350                 while ((length < operand[0]->buffer.length) &&
 351                        (length < operand[1]->integer.value) &&
 352                        (operand[0]->buffer.pointer[length])) {
 353                         length++;
 354                 }
 355
 356                 /* Allocate a new string object */
 357
 358                 return_desc = acpi_ut_create_string_object(length);
 359                 if (!return_desc) {
 360                         status = AE_NO_MEMORY;
 361                         goto cleanup;
 362                 }
 363
 364                 /*
 365                  * Copy the raw buffer data with no transform.
 366                  * (NULL terminated already)
 367                  */
 368                 ACPI_MEMCPY(return_desc->string.pointer,
 369                             operand[0]->buffer.pointer, length);
 370                 break;
 371
 372         case AML_CONCAT_RES_OP:
 373
 374                 /* concatenate_res_template (Buffer, Buffer, Result) (ACPI 2.0) */
 375
 376                 status = acpi_ex_concat_template(operand[0], operand[1],
 377                                                  &return_desc, walk_state);
 378                 break;
 379
 380         case AML_INDEX_OP:      /* Index (Source Index Result) */
 381
 382                 /* Create the internal return object */
 383
 384                 return_desc =
 385                     acpi_ut_create_internal_object(ACPI_TYPE_LOCAL_REFERENCE);
 386                 if (!return_desc) {
 387                         status = AE_NO_MEMORY;
 388                         goto cleanup;
 389                 }
 390
 391                 /* Initialize the Index reference object */
 392
 393                 index = operand[1]->integer.value;
 394                 return_desc->reference.offset = (u32) index;
 395                 return_desc->reference.opcode = AML_INDEX_OP;
 396
 397                 /*
 398                  * At this point, the Source operand is a String, Buffer, or Package.
 399                  * Verify that the index is within range.
 400                  */
 401                 switch (ACPI_GET_OBJECT_TYPE(operand[0])) {
 402                 case ACPI_TYPE_STRING:
 403
 404                         if (index >= operand[0]->string.length) {
 405                                 status = AE_AML_STRING_LIMIT;
 406                         }
 407
 408                         return_desc->reference.target_type =
 409                             ACPI_TYPE_BUFFER_FIELD;
 410                         break;
 411
 412                 case ACPI_TYPE_BUFFER:
 413
 414                         if (index >= operand[0]->buffer.length) {
 415                                 status = AE_AML_BUFFER_LIMIT;
 416                         }
 417
 418                         return_desc->reference.target_type =
 419                             ACPI_TYPE_BUFFER_FIELD;
 420                         break;
 421
 422                 case ACPI_TYPE_PACKAGE:
 423
 424                         if (index >= operand[0]->package.count) {
 425                                 status = AE_AML_PACKAGE_LIMIT;
 426                         }
 427
 428                         return_desc->reference.target_type = ACPI_TYPE_PACKAGE;
 429                         return_desc->reference.where =
 430                             &operand[0]->package.elements[index];
 431                         break;
 432
 433                 default:
 434
 435                         status = AE_AML_INTERNAL;
 436                         goto cleanup;
 437                 }
 438
 439                 /* Failure means that the Index was beyond the end of the object */
 440
 441                 if (ACPI_FAILURE(status)) {
 442                         ACPI_EXCEPTION((AE_INFO, status,
 443                                         "Index (%X%8.8X) is beyond end of object",
 444                                         ACPI_FORMAT_UINT64(index)));
 445                         goto cleanup;
 446                 }
 447
 448                 /*
 449                  * Save the target object and add a reference to it for the life
 450                  * of the index
 451                  */
 452                 return_desc->reference.object = operand[0];
 453                 acpi_ut_add_reference(operand[0]);
 454
 455                 /* Store the reference to the Target */
 456
 457                 status = acpi_ex_store(return_desc, operand[2], walk_state);
 458
 459                 /* Return the reference */
 460
 461                 walk_state->result_obj = return_desc;
 462                 goto cleanup;
 463
 464         default:
 465
 466                 ACPI_ERROR((AE_INFO, "Unknown AML opcode %X",
 467                             walk_state->opcode));
 468                 status = AE_AML_BAD_OPCODE;
 469                 break;
 470         }
 471
 472       store_result_to_target:
 473
 474         if (ACPI_SUCCESS(status)) {
 475                 /*
 476                  * Store the result of the operation (which is now in return_desc) into
 477                  * the Target descriptor.
 478                  */
 479                 status = acpi_ex_store(return_desc, operand[2], walk_state);
 480                 if (ACPI_FAILURE(status)) {
 481                         goto cleanup;
 482                 }
 483
 484                 if (!walk_state->result_obj) {
 485                         walk_state->result_obj = return_desc;
 486                 }
 487         }
 488
 489       cleanup:
 490
 491         /* Delete return object on error */
 492
 493         if (ACPI_FAILURE(status)) {
 494                 acpi_ut_remove_reference(return_desc);
 495                 walk_state->result_obj = NULL;
 496         }
 497
 498         return_ACPI_STATUS(status);
 499 }
 500
 501 /*******************************************************************************
 502  *
 503  * FUNCTION:    acpi_ex_opcode_2A_0T_1R
 504  *
 505  * PARAMETERS:  walk_state          - Current walk state
 506  *
 507  * RETURN:      Status
 508  *
 509  * DESCRIPTION: Execute opcode with 2 arguments, no target, and a return value
 510  *
 511  ******************************************************************************/
 512
 513 acpi_status acpi_ex_opcode_2A_0T_1R(struct acpi_walk_state *walk_state)
 514 {
 515         union acpi_operand_object **operand = &walk_state->operands[0];
 516         union acpi_operand_object *return_desc = NULL;
 517         acpi_status status = AE_OK;
 518         u8 logical_result = FALSE;
 519
 520         ACPI_FUNCTION_TRACE_STR(ex_opcode_2A_0T_1R,
 521                                 acpi_ps_get_opcode_name(walk_state->opcode));
 522
 523         /* Create the internal return object */
 524
 525         return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
 526         if (!return_desc) {
 527                 status = AE_NO_MEMORY;
 528                 goto cleanup;
 529         }
 530
 531         /* Execute the Opcode */
 532
 533         if (walk_state->op_info->flags & AML_LOGICAL_NUMERIC) {
 534
 535                 /* logical_op (Operand0, Operand1) */
 536
 537                 status = acpi_ex_do_logical_numeric_op(walk_state->opcode,
 538                                                        operand[0]->integer.
 539                                                        value,
 540                                                        operand[1]->integer.
 541                                                        value, &logical_result);
 542                 goto store_logical_result;
 543         } else if (walk_state->op_info->flags & AML_LOGICAL) {
 544
 545                 /* logical_op (Operand0, Operand1) */
 546
 547                 status = acpi_ex_do_logical_op(walk_state->opcode, operand[0],
 548                                                operand[1], &logical_result);
 549                 goto store_logical_result;
 550         }
 551
 552         switch (walk_state->opcode) {
 553         case AML_ACQUIRE_OP:    /* Acquire (mutex_object, Timeout) */
 554
 555                 status =
 556                     acpi_ex_acquire_mutex(operand[1], operand[0], walk_state);
 557                 if (status == AE_TIME) {
 558                         logical_result = TRUE;  /* TRUE = Acquire timed out */
 559                         status = AE_OK;
 560                 }
 561                 break;
 562
 563         case AML_WAIT_OP:       /* Wait (event_object, Timeout) */
 564
 565                 status = acpi_ex_system_wait_event(operand[1], operand[0]);
 566                 if (status == AE_TIME) {
 567                         logical_result = TRUE;  /* TRUE, Wait timed out */
 568                         status = AE_OK;
 569                 }
 570                 break;
 571
 572         default:
 573
 574                 ACPI_ERROR((AE_INFO, "Unknown AML opcode %X",
 575                             walk_state->opcode));
 576                 status = AE_AML_BAD_OPCODE;
 577                 goto cleanup;
 578         }
 579
 580       store_logical_result:
 581         /*
 582          * Set return value to according to logical_result. logical TRUE (all ones)
 583          * Default is FALSE (zero)
 584          */
 585         if (logical_result) {
 586                 return_desc->integer.value = ACPI_INTEGER_MAX;
 587         }
 588
 589       cleanup:
 590
 591         /* Delete return object on error */
 592
 593         if (ACPI_FAILURE(status)) {
 594                 acpi_ut_remove_reference(return_desc);
 595         }
 596
 597         /* Save return object on success */
 598
 599         else {
 600                 walk_state->result_obj = return_desc;
 601         }
 602
 603         return_ACPI_STATUS(status);
 604 }