git.oblomov.eu 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 - 2006, R. Byron Moore
   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 "device_wake" 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                                 /* AE_WAKE_ONLY_GPE only error, means ignore this notify */
 142
 143                                 return_ACPI_STATUS(AE_OK)
 144                         }
 145                 }
 146 #endif
 147
 148                 /*
 149                  * Dispatch the notify to the appropriate handler
 150                  * NOTE: the request is queued for execution after this method
 151                  * completes.  The notify handlers are NOT invoked synchronously
 152                  * from this thread -- because handlers may in turn run other
 153                  * control methods.
 154                  */
 155                 status = acpi_ev_queue_notify_request(node, value);
 156                 break;
 157
 158         default:
 159
 160                 ACPI_ERROR((AE_INFO, "Unknown AML opcode %X",
 161                             walk_state->opcode));
 162                 status = AE_AML_BAD_OPCODE;
 163         }
 164
 165         return_ACPI_STATUS(status);
 166 }
 167
 168 /*******************************************************************************
 169  *
 170  * FUNCTION:    acpi_ex_opcode_2A_2T_1R
 171  *
 172  * PARAMETERS:  walk_state          - Current walk state
 173  *
 174  * RETURN:      Status
 175  *
 176  * DESCRIPTION: Execute a dyadic operator (2 operands) with 2 output targets
 177  *              and one implicit return value.
 178  *
 179  ******************************************************************************/
 180
 181 acpi_status acpi_ex_opcode_2A_2T_1R(struct acpi_walk_state *walk_state)
 182 {
 183         union acpi_operand_object **operand = &walk_state->operands[0];
 184         union acpi_operand_object *return_desc1 = NULL;
 185         union acpi_operand_object *return_desc2 = NULL;
 186         acpi_status status;
 187
 188         ACPI_FUNCTION_TRACE_STR("ex_opcode_2A_2T_1R",
 189                                 acpi_ps_get_opcode_name(walk_state->opcode));
 190
 191         /* Execute the opcode */
 192
 193         switch (walk_state->opcode) {
 194         case AML_DIVIDE_OP:
 195
 196                 /* Divide (Dividend, Divisor, remainder_result quotient_result) */
 197
 198                 return_desc1 =
 199                     acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
 200                 if (!return_desc1) {
 201                         status = AE_NO_MEMORY;
 202                         goto cleanup;
 203                 }
 204
 205                 return_desc2 =
 206                     acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
 207                 if (!return_desc2) {
 208                         status = AE_NO_MEMORY;
 209                         goto cleanup;
 210                 }
 211
 212                 /* Quotient to return_desc1, remainder to return_desc2 */
 213
 214                 status = acpi_ut_divide(operand[0]->integer.value,
 215                                         operand[1]->integer.value,
 216                                         &return_desc1->integer.value,
 217                                         &return_desc2->integer.value);
 218                 if (ACPI_FAILURE(status)) {
 219                         goto cleanup;
 220                 }
 221                 break;
 222
 223         default:
 224
 225                 ACPI_ERROR((AE_INFO, "Unknown AML opcode %X",
 226                             walk_state->opcode));
 227                 status = AE_AML_BAD_OPCODE;
 228                 goto cleanup;
 229         }
 230
 231         /* Store the results to the target reference operands */
 232
 233         status = acpi_ex_store(return_desc2, operand[2], walk_state);
 234         if (ACPI_FAILURE(status)) {
 235                 goto cleanup;
 236         }
 237
 238         status = acpi_ex_store(return_desc1, operand[3], walk_state);
 239         if (ACPI_FAILURE(status)) {
 240                 goto cleanup;
 241         }
 242
 243         /* Return the remainder */
 244
 245         walk_state->result_obj = return_desc1;
 246
 247       cleanup:
 248         /*
 249          * Since the remainder is not returned indirectly, remove a reference to
 250          * it. Only the quotient is returned indirectly.
 251          */
 252         acpi_ut_remove_reference(return_desc2);
 253
 254         if (ACPI_FAILURE(status)) {
 255                 /* Delete the return object */
 256
 257                 acpi_ut_remove_reference(return_desc1);
 258         }
 259
 260         return_ACPI_STATUS(status);
 261 }
 262
 263 /*******************************************************************************
 264  *
 265  * FUNCTION:    acpi_ex_opcode_2A_1T_1R
 266  *
 267  * PARAMETERS:  walk_state          - Current walk state
 268  *
 269  * RETURN:      Status
 270  *
 271  * DESCRIPTION: Execute opcode with two arguments, one target, and a return
 272  *              value.
 273  *
 274  ******************************************************************************/
 275
 276 acpi_status acpi_ex_opcode_2A_1T_1R(struct acpi_walk_state *walk_state)
 277 {
 278         union acpi_operand_object **operand = &walk_state->operands[0];
 279         union acpi_operand_object *return_desc = NULL;
 280         acpi_integer index;
 281         acpi_status status = AE_OK;
 282         acpi_size length;
 283
 284         ACPI_FUNCTION_TRACE_STR("ex_opcode_2A_1T_1R",
 285                                 acpi_ps_get_opcode_name(walk_state->opcode));
 286
 287         /* Execute the opcode */
 288
 289         if (walk_state->op_info->flags & AML_MATH) {
 290                 /* All simple math opcodes (add, etc.) */
 291
 292                 return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
 293                 if (!return_desc) {
 294                         status = AE_NO_MEMORY;
 295                         goto cleanup;
 296                 }
 297
 298                 return_desc->integer.value =
 299                     acpi_ex_do_math_op(walk_state->opcode,
 300                                        operand[0]->integer.value,
 301                                        operand[1]->integer.value);
 302                 goto store_result_to_target;
 303         }
 304
 305         switch (walk_state->opcode) {
 306         case AML_MOD_OP:        /* Mod (Dividend, Divisor, remainder_result (ACPI 2.0) */
 307
 308                 return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
 309                 if (!return_desc) {
 310                         status = AE_NO_MEMORY;
 311                         goto cleanup;
 312                 }
 313
 314                 /* return_desc will contain the remainder */
 315
 316                 status = acpi_ut_divide(operand[0]->integer.value,
 317                                         operand[1]->integer.value,
 318                                         NULL, &return_desc->integer.value);
 319                 break;
 320
 321         case AML_CONCAT_OP:     /* Concatenate (Data1, Data2, Result) */
 322
 323                 status = acpi_ex_do_concatenate(operand[0], operand[1],
 324                                                 &return_desc, walk_state);
 325                 break;
 326
 327         case AML_TO_STRING_OP:  /* to_string (Buffer, Length, Result) (ACPI 2.0) */
 328
 329                 /*
 330                  * Input object is guaranteed to be a buffer at this point (it may have
 331                  * been converted.)  Copy the raw buffer data to a new object of
 332                  * type String.
 333                  */
 334
 335                 /*
 336                  * Get the length of the new string. It is the smallest of:
 337                  * 1) Length of the input buffer
 338                  * 2) Max length as specified in the to_string operator
 339                  * 3) Length of input buffer up to a zero byte (null terminator)
 340                  *
 341                  * NOTE: A length of zero is ok, and will create a zero-length, null
 342                  *       terminated string.
 343                  */
 344                 length = 0;
 345                 while ((length < operand[0]->buffer.length) &&
 346                        (length < operand[1]->integer.value) &&
 347                        (operand[0]->buffer.pointer[length])) {
 348                         length++;
 349                 }
 350
 351                 /* Allocate a new string object */
 352
 353                 return_desc = acpi_ut_create_string_object(length);
 354                 if (!return_desc) {
 355                         status = AE_NO_MEMORY;
 356                         goto cleanup;
 357                 }
 358
 359                 /*
 360                  * Copy the raw buffer data with no transform.
 361                  * (NULL terminated already)
 362                  */
 363                 ACPI_MEMCPY(return_desc->string.pointer,
 364                             operand[0]->buffer.pointer, length);
 365                 break;
 366
 367         case AML_CONCAT_RES_OP:
 368
 369                 /* concatenate_res_template (Buffer, Buffer, Result) (ACPI 2.0) */
 370
 371                 status = acpi_ex_concat_template(operand[0], operand[1],
 372                                                  &return_desc, walk_state);
 373                 break;
 374
 375         case AML_INDEX_OP:      /* Index (Source Index Result) */
 376
 377                 /* Create the internal return object */
 378
 379                 return_desc =
 380                     acpi_ut_create_internal_object(ACPI_TYPE_LOCAL_REFERENCE);
 381                 if (!return_desc) {
 382                         status = AE_NO_MEMORY;
 383                         goto cleanup;
 384                 }
 385
 386                 index = operand[1]->integer.value;
 387
 388                 /* At this point, the Source operand is a Package, Buffer, or String */
 389
 390                 if (ACPI_GET_OBJECT_TYPE(operand[0]) == ACPI_TYPE_PACKAGE) {
 391                         /* Object to be indexed is a Package */
 392
 393                         if (index >= operand[0]->package.count) {
 394                                 ACPI_ERROR((AE_INFO,
 395                                             "Index value (%X%8.8X) beyond package end (%X)",
 396                                             ACPI_FORMAT_UINT64(index),
 397                                             operand[0]->package.count));
 398                                 status = AE_AML_PACKAGE_LIMIT;
 399                                 goto cleanup;
 400                         }
 401
 402                         return_desc->reference.target_type = ACPI_TYPE_PACKAGE;
 403                         return_desc->reference.object = operand[0];
 404                         return_desc->reference.where =
 405                             &operand[0]->package.elements[index];
 406                 } else {
 407                         /* Object to be indexed is a Buffer/String */
 408
 409                         if (index >= operand[0]->buffer.length) {
 410                                 ACPI_ERROR((AE_INFO,
 411                                             "Index value (%X%8.8X) beyond end of buffer (%X)",
 412                                             ACPI_FORMAT_UINT64(index),
 413                                             operand[0]->buffer.length));
 414                                 status = AE_AML_BUFFER_LIMIT;
 415                                 goto cleanup;
 416                         }
 417
 418                         return_desc->reference.target_type =
 419                             ACPI_TYPE_BUFFER_FIELD;
 420                         return_desc->reference.object = operand[0];
 421                 }
 422
 423                 /*
 424                  * Add a reference to the target package/buffer/string for the life
 425                  * of the index.
 426                  */
 427                 acpi_ut_add_reference(operand[0]);
 428
 429                 /* Complete the Index reference object */
 430
 431                 return_desc->reference.opcode = AML_INDEX_OP;
 432                 return_desc->reference.offset = (u32) index;
 433
 434                 /* Store the reference to the Target */
 435
 436                 status = acpi_ex_store(return_desc, operand[2], walk_state);
 437
 438                 /* Return the reference */
 439
 440                 walk_state->result_obj = return_desc;
 441                 goto cleanup;
 442
 443         default:
 444
 445                 ACPI_ERROR((AE_INFO, "Unknown AML opcode %X",
 446                             walk_state->opcode));
 447                 status = AE_AML_BAD_OPCODE;
 448                 break;
 449         }
 450
 451       store_result_to_target:
 452
 453         if (ACPI_SUCCESS(status)) {
 454                 /*
 455                  * Store the result of the operation (which is now in return_desc) into
 456                  * the Target descriptor.
 457                  */
 458                 status = acpi_ex_store(return_desc, operand[2], walk_state);
 459                 if (ACPI_FAILURE(status)) {
 460                         goto cleanup;
 461                 }
 462
 463                 if (!walk_state->result_obj) {
 464                         walk_state->result_obj = return_desc;
 465                 }
 466         }
 467
 468       cleanup:
 469
 470         /* Delete return object on error */
 471
 472         if (ACPI_FAILURE(status)) {
 473                 acpi_ut_remove_reference(return_desc);
 474         }
 475
 476         return_ACPI_STATUS(status);
 477 }
 478
 479 /*******************************************************************************
 480  *
 481  * FUNCTION:    acpi_ex_opcode_2A_0T_1R
 482  *
 483  * PARAMETERS:  walk_state          - Current walk state
 484  *
 485  * RETURN:      Status
 486  *
 487  * DESCRIPTION: Execute opcode with 2 arguments, no target, and a return value
 488  *
 489  ******************************************************************************/
 490
 491 acpi_status acpi_ex_opcode_2A_0T_1R(struct acpi_walk_state *walk_state)
 492 {
 493         union acpi_operand_object **operand = &walk_state->operands[0];
 494         union acpi_operand_object *return_desc = NULL;
 495         acpi_status status = AE_OK;
 496         u8 logical_result = FALSE;
 497
 498         ACPI_FUNCTION_TRACE_STR("ex_opcode_2A_0T_1R",
 499                                 acpi_ps_get_opcode_name(walk_state->opcode));
 500
 501         /* Create the internal return object */
 502
 503         return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
 504         if (!return_desc) {
 505                 status = AE_NO_MEMORY;
 506                 goto cleanup;
 507         }
 508
 509         /* Execute the Opcode */
 510
 511         if (walk_state->op_info->flags & AML_LOGICAL_NUMERIC) {
 512                 /* logical_op (Operand0, Operand1) */
 513
 514                 status = acpi_ex_do_logical_numeric_op(walk_state->opcode,
 515                                                        operand[0]->integer.
 516                                                        value,
 517                                                        operand[1]->integer.
 518                                                        value, &logical_result);
 519                 goto store_logical_result;
 520         } else if (walk_state->op_info->flags & AML_LOGICAL) {
 521                 /* logical_op (Operand0, Operand1) */
 522
 523                 status = acpi_ex_do_logical_op(walk_state->opcode, operand[0],
 524                                                operand[1], &logical_result);
 525                 goto store_logical_result;
 526         }
 527
 528         switch (walk_state->opcode) {
 529         case AML_ACQUIRE_OP:    /* Acquire (mutex_object, Timeout) */
 530
 531                 status =
 532                     acpi_ex_acquire_mutex(operand[1], operand[0], walk_state);
 533                 if (status == AE_TIME) {
 534                         logical_result = TRUE;  /* TRUE = Acquire timed out */
 535                         status = AE_OK;
 536                 }
 537                 break;
 538
 539         case AML_WAIT_OP:       /* Wait (event_object, Timeout) */
 540
 541                 status = acpi_ex_system_wait_event(operand[1], operand[0]);
 542                 if (status == AE_TIME) {
 543                         logical_result = TRUE;  /* TRUE, Wait timed out */
 544                         status = AE_OK;
 545                 }
 546                 break;
 547
 548         default:
 549
 550                 ACPI_ERROR((AE_INFO, "Unknown AML opcode %X",
 551                             walk_state->opcode));
 552                 status = AE_AML_BAD_OPCODE;
 553                 goto cleanup;
 554         }
 555
 556       store_logical_result:
 557         /*
 558          * Set return value to according to logical_result. logical TRUE (all ones)
 559          * Default is FALSE (zero)
 560          */
 561         if (logical_result) {
 562                 return_desc->integer.value = ACPI_INTEGER_MAX;
 563         }
 564
 565         walk_state->result_obj = return_desc;
 566
 567       cleanup:
 568
 569         /* Delete return object on error */
 570
 571         if (ACPI_FAILURE(status)) {
 572                 acpi_ut_remove_reference(return_desc);
 573         }
 574
 575         return_ACPI_STATUS(status);
 576 }