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 - 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/accommon.h>
  46 #include <acpi/acparser.h>
  47 #include <acpi/acinterp.h>
  48 #include <acpi/acevents.h>
  49 #include <acpi/amlcode.h>
  50
  51 #define _COMPONENT          ACPI_EXECUTER
  52 ACPI_MODULE_NAME("exoparg2")
  53
  54 /*!
  55  * Naming convention for AML interpreter execution routines.
  56  *
  57  * The routines that begin execution of AML opcodes are named with a common
  58  * convention based upon the number of arguments, the number of target operands,
  59  * and whether or not a value is returned:
  60  *
  61  *      AcpiExOpcode_xA_yT_zR
  62  *
  63  * Where:
  64  *
  65  * xA - ARGUMENTS:    The number of arguments (input operands) that are
  66  *                    required for this opcode type (1 through 6 args).
  67  * yT - TARGETS:      The number of targets (output operands) that are required
  68  *                    for this opcode type (0, 1, or 2 targets).
  69  * zR - RETURN VALUE: Indicates whether this opcode type returns a value
  70  *                    as the function return (0 or 1).
  71  *
  72  * The AcpiExOpcode* functions are called via the Dispatcher component with
  73  * fully resolved operands.
  74 !*/
  75 /*******************************************************************************
  76  *
  77  * FUNCTION:    acpi_ex_opcode_2A_0T_0R
  78  *
  79  * PARAMETERS:  walk_state          - Current walk state
  80  *
  81  * RETURN:      Status
  82  *
  83  * DESCRIPTION: Execute opcode with two arguments, no target, and no return
  84  *              value.
  85  *
  86  * ALLOCATION:  Deletes both operands
  87  *
  88  ******************************************************************************/
  89 acpi_status acpi_ex_opcode_2A_0T_0R(struct acpi_walk_state *walk_state)
  90 {
  91         union acpi_operand_object **operand = &walk_state->operands[0];
  92         struct acpi_namespace_node *node;
  93         u32 value;
  94         acpi_status status = AE_OK;
  95
  96         ACPI_FUNCTION_TRACE_STR(ex_opcode_2A_0T_0R,
  97                                 acpi_ps_get_opcode_name(walk_state->opcode));
  98
  99         /* Examine the opcode */
 100
 101         switch (walk_state->opcode) {
 102         case AML_NOTIFY_OP:     /* Notify (notify_object, notify_value) */
 103
 104                 /* The first operand is a namespace node */
 105
 106                 node = (struct acpi_namespace_node *)operand[0];
 107
 108                 /* Second value is the notify value */
 109
 110                 value = (u32) operand[1]->integer.value;
 111
 112                 /* Are notifies allowed on this object? */
 113
 114                 if (!acpi_ev_is_notify_object(node)) {
 115                         ACPI_ERROR((AE_INFO,
 116                                     "Unexpected notify object type [%s]",
 117                                     acpi_ut_get_type_name(node->type)));
 118
 119                         status = AE_AML_OPERAND_TYPE;
 120                         break;
 121                 }
 122 #ifdef ACPI_GPE_NOTIFY_CHECK
 123                 /*
 124                  * GPE method wake/notify check.  Here, we want to ensure that we
 125                  * don't receive any "DeviceWake" Notifies from a GPE _Lxx or _Exx
 126                  * GPE method during system runtime.  If we do, the GPE is marked
 127                  * as "wake-only" and disabled.
 128                  *
 129                  * 1) Is the Notify() value == device_wake?
 130                  * 2) Is this a GPE deferred method?  (An _Lxx or _Exx method)
 131                  * 3) Did the original GPE happen at system runtime?
 132                  *    (versus during wake)
 133                  *
 134                  * If all three cases are true, this is a wake-only GPE that should
 135                  * be disabled at runtime.
 136                  */
 137                 if (value == 2) {       /* device_wake */
 138                         status =
 139                             acpi_ev_check_for_wake_only_gpe(walk_state->
 140                                                             gpe_event_info);
 141                         if (ACPI_FAILURE(status)) {
 142
 143                                 /* AE_WAKE_ONLY_GPE only error, means ignore this notify */
 144
 145                                 return_ACPI_STATUS(AE_OK)
 146                         }
 147                 }
 148 #endif
 149
 150                 /*
 151                  * Dispatch the notify to the appropriate handler
 152                  * NOTE: the request is queued for execution after this method
 153                  * completes.  The notify handlers are NOT invoked synchronously
 154                  * from this thread -- because handlers may in turn run other
 155                  * control methods.
 156                  */
 157                 status = acpi_ev_queue_notify_request(node, value);
 158                 break;
 159
 160         default:
 161
 162                 ACPI_ERROR((AE_INFO, "Unknown AML opcode %X",
 163                             walk_state->opcode));
 164                 status = AE_AML_BAD_OPCODE;
 165         }
 166
 167         return_ACPI_STATUS(status);
 168 }
 169
 170 /*******************************************************************************
 171  *
 172  * FUNCTION:    acpi_ex_opcode_2A_2T_1R
 173  *
 174  * PARAMETERS:  walk_state          - Current walk state
 175  *
 176  * RETURN:      Status
 177  *
 178  * DESCRIPTION: Execute a dyadic operator (2 operands) with 2 output targets
 179  *              and one implicit return value.
 180  *
 181  ******************************************************************************/
 182
 183 acpi_status acpi_ex_opcode_2A_2T_1R(struct acpi_walk_state *walk_state)
 184 {
 185         union acpi_operand_object **operand = &walk_state->operands[0];
 186         union acpi_operand_object *return_desc1 = NULL;
 187         union acpi_operand_object *return_desc2 = NULL;
 188         acpi_status status;
 189
 190         ACPI_FUNCTION_TRACE_STR(ex_opcode_2A_2T_1R,
 191                                 acpi_ps_get_opcode_name(walk_state->opcode));
 192
 193         /* Execute the opcode */
 194
 195         switch (walk_state->opcode) {
 196         case AML_DIVIDE_OP:
 197
 198                 /* Divide (Dividend, Divisor, remainder_result quotient_result) */
 199
 200                 return_desc1 =
 201                     acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
 202                 if (!return_desc1) {
 203                         status = AE_NO_MEMORY;
 204                         goto cleanup;
 205                 }
 206
 207                 return_desc2 =
 208                     acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
 209                 if (!return_desc2) {
 210                         status = AE_NO_MEMORY;
 211                         goto cleanup;
 212                 }
 213
 214                 /* Quotient to return_desc1, remainder to return_desc2 */
 215
 216                 status = acpi_ut_divide(operand[0]->integer.value,
 217                                         operand[1]->integer.value,
 218                                         &return_desc1->integer.value,
 219                                         &return_desc2->integer.value);
 220                 if (ACPI_FAILURE(status)) {
 221                         goto cleanup;
 222                 }
 223                 break;
 224
 225         default:
 226
 227                 ACPI_ERROR((AE_INFO, "Unknown AML opcode %X",
 228                             walk_state->opcode));
 229                 status = AE_AML_BAD_OPCODE;
 230                 goto cleanup;
 231         }
 232
 233         /* Store the results to the target reference operands */
 234
 235         status = acpi_ex_store(return_desc2, operand[2], walk_state);
 236         if (ACPI_FAILURE(status)) {
 237                 goto cleanup;
 238         }
 239
 240         status = acpi_ex_store(return_desc1, operand[3], walk_state);
 241         if (ACPI_FAILURE(status)) {
 242                 goto cleanup;
 243         }
 244
 245       cleanup:
 246         /*
 247          * Since the remainder is not returned indirectly, remove a reference to
 248          * it. Only the quotient is returned indirectly.
 249          */
 250         acpi_ut_remove_reference(return_desc2);
 251
 252         if (ACPI_FAILURE(status)) {
 253
 254                 /* Delete the return object */
 255
 256                 acpi_ut_remove_reference(return_desc1);
 257         }
 258
 259         /* Save return object (the remainder) on success */
 260
 261         else {
 262                 walk_state->result_obj = return_desc1;
 263         }
 264
 265         return_ACPI_STATUS(status);
 266 }
 267
 268 /*******************************************************************************
 269  *
 270  * FUNCTION:    acpi_ex_opcode_2A_1T_1R
 271  *
 272  * PARAMETERS:  walk_state          - Current walk state
 273  *
 274  * RETURN:      Status
 275  *
 276  * DESCRIPTION: Execute opcode with two arguments, one target, and a return
 277  *              value.
 278  *
 279  ******************************************************************************/
 280
 281 acpi_status acpi_ex_opcode_2A_1T_1R(struct acpi_walk_state *walk_state)
 282 {
 283         union acpi_operand_object **operand = &walk_state->operands[0];
 284         union acpi_operand_object *return_desc = NULL;
 285         acpi_integer index;
 286         acpi_status status = AE_OK;
 287         acpi_size length;
 288
 289         ACPI_FUNCTION_TRACE_STR(ex_opcode_2A_1T_1R,
 290                                 acpi_ps_get_opcode_name(walk_state->opcode));
 291
 292         /* Execute the opcode */
 293
 294         if (walk_state->op_info->flags & AML_MATH) {
 295
 296                 /* All simple math opcodes (add, etc.) */
 297
 298                 return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
 299                 if (!return_desc) {
 300                         status = AE_NO_MEMORY;
 301                         goto cleanup;
 302                 }
 303
 304                 return_desc->integer.value =
 305                     acpi_ex_do_math_op(walk_state->opcode,
 306                                        operand[0]->integer.value,
 307                                        operand[1]->integer.value);
 308                 goto store_result_to_target;
 309         }
 310
 311         switch (walk_state->opcode) {
 312         case AML_MOD_OP:        /* Mod (Dividend, Divisor, remainder_result (ACPI 2.0) */
 313
 314                 return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
 315                 if (!return_desc) {
 316                         status = AE_NO_MEMORY;
 317                         goto cleanup;
 318                 }
 319
 320                 /* return_desc will contain the remainder */
 321
 322                 status = acpi_ut_divide(operand[0]->integer.value,
 323                                         operand[1]->integer.value,
 324                                         NULL, &return_desc->integer.value);
 325                 break;
 326
 327         case AML_CONCAT_OP:     /* Concatenate (Data1, Data2, Result) */
 328
 329                 status = acpi_ex_do_concatenate(operand[0], operand[1],
 330                                                 &return_desc, walk_state);
 331                 break;
 332
 333         case AML_TO_STRING_OP:  /* to_string (Buffer, Length, Result) (ACPI 2.0) */
 334
 335                 /*
 336                  * Input object is guaranteed to be a buffer at this point (it may have
 337                  * been converted.)  Copy the raw buffer data to a new object of
 338                  * type String.
 339                  */
 340
 341                 /*
 342                  * Get the length of the new string. It is the smallest of:
 343                  * 1) Length of the input buffer
 344                  * 2) Max length as specified in the to_string operator
 345                  * 3) Length of input buffer up to a zero byte (null terminator)
 346                  *
 347                  * NOTE: A length of zero is ok, and will create a zero-length, null
 348                  *       terminated string.
 349                  */
 350                 length = 0;
 351                 while ((length < operand[0]->buffer.length) &&
 352                        (length < operand[1]->integer.value) &&
 353                        (operand[0]->buffer.pointer[length])) {
 354                         length++;
 355                 }
 356
 357                 /* Allocate a new string object */
 358
 359                 return_desc = acpi_ut_create_string_object(length);
 360                 if (!return_desc) {
 361                         status = AE_NO_MEMORY;
 362                         goto cleanup;
 363                 }
 364
 365                 /*
 366                  * Copy the raw buffer data with no transform.
 367                  * (NULL terminated already)
 368                  */
 369                 ACPI_MEMCPY(return_desc->string.pointer,
 370                             operand[0]->buffer.pointer, length);
 371                 break;
 372
 373         case AML_CONCAT_RES_OP:
 374
 375                 /* concatenate_res_template (Buffer, Buffer, Result) (ACPI 2.0) */
 376
 377                 status = acpi_ex_concat_template(operand[0], operand[1],
 378                                                  &return_desc, walk_state);
 379                 break;
 380
 381         case AML_INDEX_OP:      /* Index (Source Index Result) */
 382
 383                 /* Create the internal return object */
 384
 385                 return_desc =
 386                     acpi_ut_create_internal_object(ACPI_TYPE_LOCAL_REFERENCE);
 387                 if (!return_desc) {
 388                         status = AE_NO_MEMORY;
 389                         goto cleanup;
 390                 }
 391
 392                 /* Initialize the Index reference object */
 393
 394                 index = operand[1]->integer.value;
 395                 return_desc->reference.value = (u32) index;
 396                 return_desc->reference.class = ACPI_REFCLASS_INDEX;
 397
 398                 /*
 399                  * At this point, the Source operand is a String, Buffer, or Package.
 400                  * Verify that the index is within range.
 401                  */
 402                 switch (ACPI_GET_OBJECT_TYPE(operand[0])) {
 403                 case ACPI_TYPE_STRING:
 404
 405                         if (index >= operand[0]->string.length) {
 406                                 status = AE_AML_STRING_LIMIT;
 407                         }
 408
 409                         return_desc->reference.target_type =
 410                             ACPI_TYPE_BUFFER_FIELD;
 411                         break;
 412
 413                 case ACPI_TYPE_BUFFER:
 414
 415                         if (index >= operand[0]->buffer.length) {
 416                                 status = AE_AML_BUFFER_LIMIT;
 417                         }
 418
 419                         return_desc->reference.target_type =
 420                             ACPI_TYPE_BUFFER_FIELD;
 421                         break;
 422
 423                 case ACPI_TYPE_PACKAGE:
 424
 425                         if (index >= operand[0]->package.count) {
 426                                 status = AE_AML_PACKAGE_LIMIT;
 427                         }
 428
 429                         return_desc->reference.target_type = ACPI_TYPE_PACKAGE;
 430                         return_desc->reference.where =
 431                             &operand[0]->package.elements[index];
 432                         break;
 433
 434                 default:
 435
 436                         status = AE_AML_INTERNAL;
 437                         goto cleanup;
 438                 }
 439
 440                 /* Failure means that the Index was beyond the end of the object */
 441
 442                 if (ACPI_FAILURE(status)) {
 443                         ACPI_EXCEPTION((AE_INFO, status,
 444                                         "Index (%X%8.8X) is beyond end of object",
 445                                         ACPI_FORMAT_UINT64(index)));
 446                         goto cleanup;
 447                 }
 448
 449                 /*
 450                  * Save the target object and add a reference to it for the life
 451                  * of the index
 452                  */
 453                 return_desc->reference.object = operand[0];
 454                 acpi_ut_add_reference(operand[0]);
 455
 456                 /* Store the reference to the Target */
 457
 458                 status = acpi_ex_store(return_desc, operand[2], walk_state);
 459
 460                 /* Return the reference */
 461
 462                 walk_state->result_obj = return_desc;
 463                 goto cleanup;
 464
 465         default:
 466
 467                 ACPI_ERROR((AE_INFO, "Unknown AML opcode %X",
 468                             walk_state->opcode));
 469                 status = AE_AML_BAD_OPCODE;
 470                 break;
 471         }
 472
 473       store_result_to_target:
 474
 475         if (ACPI_SUCCESS(status)) {
 476                 /*
 477                  * Store the result of the operation (which is now in return_desc) into
 478                  * the Target descriptor.
 479                  */
 480                 status = acpi_ex_store(return_desc, operand[2], walk_state);
 481                 if (ACPI_FAILURE(status)) {
 482                         goto cleanup;
 483                 }
 484
 485                 if (!walk_state->result_obj) {
 486                         walk_state->result_obj = return_desc;
 487                 }
 488         }
 489
 490       cleanup:
 491
 492         /* Delete return object on error */
 493
 494         if (ACPI_FAILURE(status)) {
 495                 acpi_ut_remove_reference(return_desc);
 496                 walk_state->result_obj = NULL;
 497         }
 498
 499         return_ACPI_STATUS(status);
 500 }
 501
 502 /*******************************************************************************
 503  *
 504  * FUNCTION:    acpi_ex_opcode_2A_0T_1R
 505  *
 506  * PARAMETERS:  walk_state          - Current walk state
 507  *
 508  * RETURN:      Status
 509  *
 510  * DESCRIPTION: Execute opcode with 2 arguments, no target, and a return value
 511  *
 512  ******************************************************************************/
 513
 514 acpi_status acpi_ex_opcode_2A_0T_1R(struct acpi_walk_state *walk_state)
 515 {
 516         union acpi_operand_object **operand = &walk_state->operands[0];
 517         union acpi_operand_object *return_desc = NULL;
 518         acpi_status status = AE_OK;
 519         u8 logical_result = FALSE;
 520
 521         ACPI_FUNCTION_TRACE_STR(ex_opcode_2A_0T_1R,
 522                                 acpi_ps_get_opcode_name(walk_state->opcode));
 523
 524         /* Create the internal return object */
 525
 526         return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
 527         if (!return_desc) {
 528                 status = AE_NO_MEMORY;
 529                 goto cleanup;
 530         }
 531
 532         /* Execute the Opcode */
 533
 534         if (walk_state->op_info->flags & AML_LOGICAL_NUMERIC) {
 535
 536                 /* logical_op (Operand0, Operand1) */
 537
 538                 status = acpi_ex_do_logical_numeric_op(walk_state->opcode,
 539                                                        operand[0]->integer.
 540                                                        value,
 541                                                        operand[1]->integer.
 542                                                        value, &logical_result);
 543                 goto store_logical_result;
 544         } else if (walk_state->op_info->flags & AML_LOGICAL) {
 545
 546                 /* logical_op (Operand0, Operand1) */
 547
 548                 status = acpi_ex_do_logical_op(walk_state->opcode, operand[0],
 549                                                operand[1], &logical_result);
 550                 goto store_logical_result;
 551         }
 552
 553         switch (walk_state->opcode) {
 554         case AML_ACQUIRE_OP:    /* Acquire (mutex_object, Timeout) */
 555
 556                 status =
 557                     acpi_ex_acquire_mutex(operand[1], operand[0], walk_state);
 558                 if (status == AE_TIME) {
 559                         logical_result = TRUE;  /* TRUE = Acquire timed out */
 560                         status = AE_OK;
 561                 }
 562                 break;
 563
 564         case AML_WAIT_OP:       /* Wait (event_object, Timeout) */
 565
 566                 status = acpi_ex_system_wait_event(operand[1], operand[0]);
 567                 if (status == AE_TIME) {
 568                         logical_result = TRUE;  /* TRUE, Wait timed out */
 569                         status = AE_OK;
 570                 }
 571                 break;
 572
 573         default:
 574
 575                 ACPI_ERROR((AE_INFO, "Unknown AML opcode %X",
 576                             walk_state->opcode));
 577                 status = AE_AML_BAD_OPCODE;
 578                 goto cleanup;
 579         }
 580
 581       store_logical_result:
 582         /*
 583          * Set return value to according to logical_result. logical TRUE (all ones)
 584          * Default is FALSE (zero)
 585          */
 586         if (logical_result) {
 587                 return_desc->integer.value = ACPI_INTEGER_MAX;
 588         }
 589
 590       cleanup:
 591
 592         /* Delete return object on error */
 593
 594         if (ACPI_FAILURE(status)) {
 595                 acpi_ut_remove_reference(return_desc);
 596         }
 597
 598         /* Save return object on success */
 599
 600         else {
 601                 walk_state->result_obj = return_desc;
 602         }
 603
 604         return_ACPI_STATUS(status);
 605 }