git.oblomov.eu Git - linux-2.6/blob - drivers/acpi/executer/exoparg1.c

   1
   2 /******************************************************************************
   3  *
   4  * Module Name: exoparg1 - AML execution - opcodes with 1 argument
   5  *
   6  *****************************************************************************/
   7
   8 /*
   9  * Copyright (C) 2000 - 2006, R. Byron Moore
  10  * All rights reserved.
  11  *
  12  * Redistribution and use in source and binary forms, with or without
  13  * modification, are permitted provided that the following conditions
  14  * are met:
  15  * 1. Redistributions of source code must retain the above copyright
  16  *    notice, this list of conditions, and the following disclaimer,
  17  *    without modification.
  18  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  19  *    substantially similar to the "NO WARRANTY" disclaimer below
  20  *    ("Disclaimer") and any redistribution must be conditioned upon
  21  *    including a substantially similar Disclaimer requirement for further
  22  *    binary redistribution.
  23  * 3. Neither the names of the above-listed copyright holders nor the names
  24  *    of any contributors may be used to endorse or promote products derived
  25  *    from this software without specific prior written permission.
  26  *
  27  * Alternatively, this software may be distributed under the terms of the
  28  * GNU General Public License ("GPL") version 2 as published by the Free
  29  * Software Foundation.
  30  *
  31  * NO WARRANTY
  32  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  33  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  34  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  35  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  36  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  37  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  38  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  39  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  40  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  41  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  42  * POSSIBILITY OF SUCH DAMAGES.
  43  */
  44
  45 #include <acpi/acpi.h>
  46 #include <acpi/acparser.h>
  47 #include <acpi/acdispat.h>
  48 #include <acpi/acinterp.h>
  49 #include <acpi/amlcode.h>
  50 #include <acpi/acnamesp.h>
  51
  52 #define _COMPONENT          ACPI_EXECUTER
  53 ACPI_MODULE_NAME("exoparg1")
  54
  55 /*!
  56  * Naming convention for AML interpreter execution routines.
  57  *
  58  * The routines that begin execution of AML opcodes are named with a common
  59  * convention based upon the number of arguments, the number of target operands,
  60  * and whether or not a value is returned:
  61  *
  62  *      AcpiExOpcode_xA_yT_zR
  63  *
  64  * Where:
  65  *
  66  * xA - ARGUMENTS:    The number of arguments (input operands) that are
  67  *                    required for this opcode type (0 through 6 args).
  68  * yT - TARGETS:      The number of targets (output operands) that are required
  69  *                    for this opcode type (0, 1, or 2 targets).
  70  * zR - RETURN VALUE: Indicates whether this opcode type returns a value
  71  *                    as the function return (0 or 1).
  72  *
  73  * The AcpiExOpcode* functions are called via the Dispatcher component with
  74  * fully resolved operands.
  75 !*/
  76 /*******************************************************************************
  77  *
  78  * FUNCTION:    acpi_ex_opcode_0A_0T_1R
  79  *
  80  * PARAMETERS:  walk_state          - Current state (contains AML opcode)
  81  *
  82  * RETURN:      Status
  83  *
  84  * DESCRIPTION: Execute operator with no operands, one return value
  85  *
  86  ******************************************************************************/
  87 acpi_status acpi_ex_opcode_0A_0T_1R(struct acpi_walk_state *walk_state)
  88 {
  89         acpi_status status = AE_OK;
  90         union acpi_operand_object *return_desc = NULL;
  91
  92         ACPI_FUNCTION_TRACE_STR("ex_opcode_0A_0T_1R",
  93                                 acpi_ps_get_opcode_name(walk_state->opcode));
  94
  95         /* Examine the AML opcode */
  96
  97         switch (walk_state->opcode) {
  98         case AML_TIMER_OP:      /*  Timer () */
  99
 100                 /* Create a return object of type Integer */
 101
 102                 return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
 103                 if (!return_desc) {
 104                         status = AE_NO_MEMORY;
 105                         goto cleanup;
 106                 }
 107 #if ACPI_MACHINE_WIDTH != 16
 108                 return_desc->integer.value = acpi_os_get_timer();
 109 #endif
 110                 break;
 111
 112         default:                /*  Unknown opcode  */
 113
 114                 ACPI_ERROR((AE_INFO, "Unknown AML opcode %X",
 115                             walk_state->opcode));
 116                 status = AE_AML_BAD_OPCODE;
 117                 break;
 118         }
 119
 120       cleanup:
 121
 122         /* Delete return object on error */
 123
 124         if ((ACPI_FAILURE(status)) || walk_state->result_obj) {
 125                 acpi_ut_remove_reference(return_desc);
 126         } else {
 127                 /* Save the return value */
 128
 129                 walk_state->result_obj = return_desc;
 130         }
 131
 132         return_ACPI_STATUS(status);
 133 }
 134
 135 /*******************************************************************************
 136  *
 137  * FUNCTION:    acpi_ex_opcode_1A_0T_0R
 138  *
 139  * PARAMETERS:  walk_state          - Current state (contains AML opcode)
 140  *
 141  * RETURN:      Status
 142  *
 143  * DESCRIPTION: Execute Type 1 monadic operator with numeric operand on
 144  *              object stack
 145  *
 146  ******************************************************************************/
 147
 148 acpi_status acpi_ex_opcode_1A_0T_0R(struct acpi_walk_state *walk_state)
 149 {
 150         union acpi_operand_object **operand = &walk_state->operands[0];
 151         acpi_status status = AE_OK;
 152
 153         ACPI_FUNCTION_TRACE_STR("ex_opcode_1A_0T_0R",
 154                                 acpi_ps_get_opcode_name(walk_state->opcode));
 155
 156         /* Examine the AML opcode */
 157
 158         switch (walk_state->opcode) {
 159         case AML_RELEASE_OP:    /*  Release (mutex_object) */
 160
 161                 status = acpi_ex_release_mutex(operand[0], walk_state);
 162                 break;
 163
 164         case AML_RESET_OP:      /*  Reset (event_object) */
 165
 166                 status = acpi_ex_system_reset_event(operand[0]);
 167                 break;
 168
 169         case AML_SIGNAL_OP:     /*  Signal (event_object) */
 170
 171                 status = acpi_ex_system_signal_event(operand[0]);
 172                 break;
 173
 174         case AML_SLEEP_OP:      /*  Sleep (msec_time) */
 175
 176                 status = acpi_ex_system_do_suspend(operand[0]->integer.value);
 177                 break;
 178
 179         case AML_STALL_OP:      /*  Stall (usec_time) */
 180
 181                 status =
 182                     acpi_ex_system_do_stall((u32) operand[0]->integer.value);
 183                 break;
 184
 185         case AML_UNLOAD_OP:     /*  Unload (Handle) */
 186
 187                 status = acpi_ex_unload_table(operand[0]);
 188                 break;
 189
 190         default:                /*  Unknown opcode  */
 191
 192                 ACPI_ERROR((AE_INFO, "Unknown AML opcode %X",
 193                             walk_state->opcode));
 194                 status = AE_AML_BAD_OPCODE;
 195                 break;
 196         }
 197
 198         return_ACPI_STATUS(status);
 199 }
 200
 201 /*******************************************************************************
 202  *
 203  * FUNCTION:    acpi_ex_opcode_1A_1T_0R
 204  *
 205  * PARAMETERS:  walk_state          - Current state (contains AML opcode)
 206  *
 207  * RETURN:      Status
 208  *
 209  * DESCRIPTION: Execute opcode with one argument, one target, and no
 210  *              return value.
 211  *
 212  ******************************************************************************/
 213
 214 acpi_status acpi_ex_opcode_1A_1T_0R(struct acpi_walk_state *walk_state)
 215 {
 216         acpi_status status = AE_OK;
 217         union acpi_operand_object **operand = &walk_state->operands[0];
 218
 219         ACPI_FUNCTION_TRACE_STR("ex_opcode_1A_1T_0R",
 220                                 acpi_ps_get_opcode_name(walk_state->opcode));
 221
 222         /* Examine the AML opcode */
 223
 224         switch (walk_state->opcode) {
 225         case AML_LOAD_OP:
 226
 227                 status = acpi_ex_load_op(operand[0], operand[1], walk_state);
 228                 break;
 229
 230         default:                /* Unknown opcode */
 231
 232                 ACPI_ERROR((AE_INFO, "Unknown AML opcode %X",
 233                             walk_state->opcode));
 234                 status = AE_AML_BAD_OPCODE;
 235                 goto cleanup;
 236         }
 237
 238       cleanup:
 239
 240         return_ACPI_STATUS(status);
 241 }
 242
 243 /*******************************************************************************
 244  *
 245  * FUNCTION:    acpi_ex_opcode_1A_1T_1R
 246  *
 247  * PARAMETERS:  walk_state          - Current state (contains AML opcode)
 248  *
 249  * RETURN:      Status
 250  *
 251  * DESCRIPTION: Execute opcode with one argument, one target, and a
 252  *              return value.
 253  *
 254  ******************************************************************************/
 255
 256 acpi_status acpi_ex_opcode_1A_1T_1R(struct acpi_walk_state *walk_state)
 257 {
 258         acpi_status status = AE_OK;
 259         union acpi_operand_object **operand = &walk_state->operands[0];
 260         union acpi_operand_object *return_desc = NULL;
 261         union acpi_operand_object *return_desc2 = NULL;
 262         u32 temp32;
 263         u32 i;
 264         acpi_integer power_of_ten;
 265         acpi_integer digit;
 266
 267         ACPI_FUNCTION_TRACE_STR("ex_opcode_1A_1T_1R",
 268                                 acpi_ps_get_opcode_name(walk_state->opcode));
 269
 270         /* Examine the AML opcode */
 271
 272         switch (walk_state->opcode) {
 273         case AML_BIT_NOT_OP:
 274         case AML_FIND_SET_LEFT_BIT_OP:
 275         case AML_FIND_SET_RIGHT_BIT_OP:
 276         case AML_FROM_BCD_OP:
 277         case AML_TO_BCD_OP:
 278         case AML_COND_REF_OF_OP:
 279
 280                 /* Create a return object of type Integer for these opcodes */
 281
 282                 return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
 283                 if (!return_desc) {
 284                         status = AE_NO_MEMORY;
 285                         goto cleanup;
 286                 }
 287
 288                 switch (walk_state->opcode) {
 289                 case AML_BIT_NOT_OP:    /* Not (Operand, Result)  */
 290
 291                         return_desc->integer.value = ~operand[0]->integer.value;
 292                         break;
 293
 294                 case AML_FIND_SET_LEFT_BIT_OP:  /* find_set_left_bit (Operand, Result) */
 295
 296                         return_desc->integer.value = operand[0]->integer.value;
 297
 298                         /*
 299                          * Acpi specification describes Integer type as a little
 300                          * endian unsigned value, so this boundary condition is valid.
 301                          */
 302                         for (temp32 = 0; return_desc->integer.value &&
 303                              temp32 < ACPI_INTEGER_BIT_SIZE; ++temp32) {
 304                                 return_desc->integer.value >>= 1;
 305                         }
 306
 307                         return_desc->integer.value = temp32;
 308                         break;
 309
 310                 case AML_FIND_SET_RIGHT_BIT_OP: /* find_set_right_bit (Operand, Result) */
 311
 312                         return_desc->integer.value = operand[0]->integer.value;
 313
 314                         /*
 315                          * The Acpi specification describes Integer type as a little
 316                          * endian unsigned value, so this boundary condition is valid.
 317                          */
 318                         for (temp32 = 0; return_desc->integer.value &&
 319                              temp32 < ACPI_INTEGER_BIT_SIZE; ++temp32) {
 320                                 return_desc->integer.value <<= 1;
 321                         }
 322
 323                         /* Since the bit position is one-based, subtract from 33 (65) */
 324
 325                         return_desc->integer.value = temp32 == 0 ? 0 :
 326                             (ACPI_INTEGER_BIT_SIZE + 1) - temp32;
 327                         break;
 328
 329                 case AML_FROM_BCD_OP:   /* from_bcd (BCDValue, Result) */
 330
 331                         /*
 332                          * The 64-bit ACPI integer can hold 16 4-bit BCD characters
 333                          * (if table is 32-bit, integer can hold 8 BCD characters)
 334                          * Convert each 4-bit BCD value
 335                          */
 336                         power_of_ten = 1;
 337                         return_desc->integer.value = 0;
 338                         digit = operand[0]->integer.value;
 339
 340                         /* Convert each BCD digit (each is one nybble wide) */
 341
 342                         for (i = 0;
 343                              (i < acpi_gbl_integer_nybble_width) && (digit > 0);
 344                              i++) {
 345                                 /* Get the least significant 4-bit BCD digit */
 346
 347                                 temp32 = ((u32) digit) & 0xF;
 348
 349                                 /* Check the range of the digit */
 350
 351                                 if (temp32 > 9) {
 352                                         ACPI_ERROR((AE_INFO,
 353                                                     "BCD digit too large (not decimal): 0x%X",
 354                                                     temp32));
 355
 356                                         status = AE_AML_NUMERIC_OVERFLOW;
 357                                         goto cleanup;
 358                                 }
 359
 360                                 /* Sum the digit into the result with the current power of 10 */
 361
 362                                 return_desc->integer.value +=
 363                                     (((acpi_integer) temp32) * power_of_ten);
 364
 365                                 /* Shift to next BCD digit */
 366
 367                                 digit >>= 4;
 368
 369                                 /* Next power of 10 */
 370
 371                                 power_of_ten *= 10;
 372                         }
 373                         break;
 374
 375                 case AML_TO_BCD_OP:     /* to_bcd (Operand, Result) */
 376
 377                         return_desc->integer.value = 0;
 378                         digit = operand[0]->integer.value;
 379
 380                         /* Each BCD digit is one nybble wide */
 381
 382                         for (i = 0;
 383                              (i < acpi_gbl_integer_nybble_width) && (digit > 0);
 384                              i++) {
 385                                 (void)acpi_ut_short_divide(digit, 10, &digit,
 386                                                            &temp32);
 387
 388                                 /*
 389                                  * Insert the BCD digit that resides in the
 390                                  * remainder from above
 391                                  */
 392                                 return_desc->integer.value |=
 393                                     (((acpi_integer) temp32) << ACPI_MUL_4(i));
 394                         }
 395
 396                         /* Overflow if there is any data left in Digit */
 397
 398                         if (digit > 0) {
 399                                 ACPI_ERROR((AE_INFO,
 400                                             "Integer too large to convert to BCD: %8.8X%8.8X",
 401                                             ACPI_FORMAT_UINT64(operand[0]->
 402                                                                integer.value)));
 403                                 status = AE_AML_NUMERIC_OVERFLOW;
 404                                 goto cleanup;
 405                         }
 406                         break;
 407
 408                 case AML_COND_REF_OF_OP:        /* cond_ref_of (source_object, Result) */
 409
 410                         /*
 411                          * This op is a little strange because the internal return value is
 412                          * different than the return value stored in the result descriptor
 413                          * (There are really two return values)
 414                          */
 415                         if ((struct acpi_namespace_node *)operand[0] ==
 416                             acpi_gbl_root_node) {
 417                                 /*
 418                                  * This means that the object does not exist in the namespace,
 419                                  * return FALSE
 420                                  */
 421                                 return_desc->integer.value = 0;
 422                                 goto cleanup;
 423                         }
 424
 425                         /* Get the object reference, store it, and remove our reference */
 426
 427                         status = acpi_ex_get_object_reference(operand[0],
 428                                                               &return_desc2,
 429                                                               walk_state);
 430                         if (ACPI_FAILURE(status)) {
 431                                 goto cleanup;
 432                         }
 433
 434                         status =
 435                             acpi_ex_store(return_desc2, operand[1], walk_state);
 436                         acpi_ut_remove_reference(return_desc2);
 437
 438                         /* The object exists in the namespace, return TRUE */
 439
 440                         return_desc->integer.value = ACPI_INTEGER_MAX;
 441                         goto cleanup;
 442
 443                 default:
 444                         /* No other opcodes get here */
 445                         break;
 446                 }
 447                 break;
 448
 449         case AML_STORE_OP:      /* Store (Source, Target) */
 450
 451                 /*
 452                  * A store operand is typically a number, string, buffer or lvalue
 453                  * Be careful about deleting the source object,
 454                  * since the object itself may have been stored.
 455                  */
 456                 status = acpi_ex_store(operand[0], operand[1], walk_state);
 457                 if (ACPI_FAILURE(status)) {
 458                         return_ACPI_STATUS(status);
 459                 }
 460
 461                 /* It is possible that the Store already produced a return object */
 462
 463                 if (!walk_state->result_obj) {
 464                         /*
 465                          * Normally, we would remove a reference on the Operand[0]
 466                          * parameter; But since it is being used as the internal return
 467                          * object (meaning we would normally increment it), the two
 468                          * cancel out, and we simply don't do anything.
 469                          */
 470                         walk_state->result_obj = operand[0];
 471                         walk_state->operands[0] = NULL; /* Prevent deletion */
 472                 }
 473                 return_ACPI_STATUS(status);
 474
 475                 /*
 476                  * ACPI 2.0 Opcodes
 477                  */
 478         case AML_COPY_OP:       /* Copy (Source, Target) */
 479
 480                 status =
 481                     acpi_ut_copy_iobject_to_iobject(operand[0], &return_desc,
 482                                                     walk_state);
 483                 break;
 484
 485         case AML_TO_DECSTRING_OP:       /* to_decimal_string (Data, Result) */
 486
 487                 status = acpi_ex_convert_to_string(operand[0], &return_desc,
 488                                                    ACPI_EXPLICIT_CONVERT_DECIMAL);
 489                 if (return_desc == operand[0]) {
 490                         /* No conversion performed, add ref to handle return value */
 491                         acpi_ut_add_reference(return_desc);
 492                 }
 493                 break;
 494
 495         case AML_TO_HEXSTRING_OP:       /* to_hex_string (Data, Result) */
 496
 497                 status = acpi_ex_convert_to_string(operand[0], &return_desc,
 498                                                    ACPI_EXPLICIT_CONVERT_HEX);
 499                 if (return_desc == operand[0]) {
 500                         /* No conversion performed, add ref to handle return value */
 501                         acpi_ut_add_reference(return_desc);
 502                 }
 503                 break;
 504
 505         case AML_TO_BUFFER_OP:  /* to_buffer (Data, Result) */
 506
 507                 status = acpi_ex_convert_to_buffer(operand[0], &return_desc);
 508                 if (return_desc == operand[0]) {
 509                         /* No conversion performed, add ref to handle return value */
 510                         acpi_ut_add_reference(return_desc);
 511                 }
 512                 break;
 513
 514         case AML_TO_INTEGER_OP: /* to_integer (Data, Result) */
 515
 516                 status = acpi_ex_convert_to_integer(operand[0], &return_desc,
 517                                                     ACPI_ANY_BASE);
 518                 if (return_desc == operand[0]) {
 519                         /* No conversion performed, add ref to handle return value */
 520                         acpi_ut_add_reference(return_desc);
 521                 }
 522                 break;
 523
 524         case AML_SHIFT_LEFT_BIT_OP:     /* shift_left_bit (Source, bit_num) */
 525         case AML_SHIFT_RIGHT_BIT_OP:    /* shift_right_bit (Source, bit_num) */
 526
 527                 /* These are two obsolete opcodes */
 528
 529                 ACPI_ERROR((AE_INFO,
 530                             "%s is obsolete and not implemented",
 531                             acpi_ps_get_opcode_name(walk_state->opcode)));
 532                 status = AE_SUPPORT;
 533                 goto cleanup;
 534
 535         default:                /* Unknown opcode */
 536
 537                 ACPI_ERROR((AE_INFO, "Unknown AML opcode %X",
 538                             walk_state->opcode));
 539                 status = AE_AML_BAD_OPCODE;
 540                 goto cleanup;
 541         }
 542
 543         if (ACPI_SUCCESS(status)) {
 544                 /* Store the return value computed above into the target object */
 545
 546                 status = acpi_ex_store(return_desc, operand[1], walk_state);
 547         }
 548
 549       cleanup:
 550
 551         if (!walk_state->result_obj) {
 552                 walk_state->result_obj = return_desc;
 553         }
 554
 555         /* Delete return object on error */
 556
 557         if (ACPI_FAILURE(status)) {
 558                 acpi_ut_remove_reference(return_desc);
 559         }
 560
 561         return_ACPI_STATUS(status);
 562 }
 563
 564 /*******************************************************************************
 565  *
 566  * FUNCTION:    acpi_ex_opcode_1A_0T_1R
 567  *
 568  * PARAMETERS:  walk_state          - Current state (contains AML opcode)
 569  *
 570  * RETURN:      Status
 571  *
 572  * DESCRIPTION: Execute opcode with one argument, no target, and a return value
 573  *
 574  ******************************************************************************/
 575
 576 acpi_status acpi_ex_opcode_1A_0T_1R(struct acpi_walk_state *walk_state)
 577 {
 578         union acpi_operand_object **operand = &walk_state->operands[0];
 579         union acpi_operand_object *temp_desc;
 580         union acpi_operand_object *return_desc = NULL;
 581         acpi_status status = AE_OK;
 582         u32 type;
 583         acpi_integer value;
 584
 585         ACPI_FUNCTION_TRACE_STR("ex_opcode_1A_0T_1R",
 586                                 acpi_ps_get_opcode_name(walk_state->opcode));
 587
 588         /* Examine the AML opcode */
 589
 590         switch (walk_state->opcode) {
 591         case AML_LNOT_OP:       /* LNot (Operand) */
 592
 593                 return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
 594                 if (!return_desc) {
 595                         status = AE_NO_MEMORY;
 596                         goto cleanup;
 597                 }
 598
 599                 /*
 600                  * Set result to ONES (TRUE) if Value == 0.  Note:
 601                  * return_desc->Integer.Value is initially == 0 (FALSE) from above.
 602                  */
 603                 if (!operand[0]->integer.value) {
 604                         return_desc->integer.value = ACPI_INTEGER_MAX;
 605                 }
 606                 break;
 607
 608         case AML_DECREMENT_OP:  /* Decrement (Operand)  */
 609         case AML_INCREMENT_OP:  /* Increment (Operand)  */
 610
 611                 /*
 612                  * Create a new integer.  Can't just get the base integer and
 613                  * increment it because it may be an Arg or Field.
 614                  */
 615                 return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
 616                 if (!return_desc) {
 617                         status = AE_NO_MEMORY;
 618                         goto cleanup;
 619                 }
 620
 621                 /*
 622                  * Since we are expecting a Reference operand, it can be either a
 623                  * NS Node or an internal object.
 624                  */
 625                 temp_desc = operand[0];
 626                 if (ACPI_GET_DESCRIPTOR_TYPE(temp_desc) ==
 627                     ACPI_DESC_TYPE_OPERAND) {
 628                         /* Internal reference object - prevent deletion */
 629
 630                         acpi_ut_add_reference(temp_desc);
 631                 }
 632
 633                 /*
 634                  * Convert the Reference operand to an Integer (This removes a
 635                  * reference on the Operand[0] object)
 636                  *
 637                  * NOTE:  We use LNOT_OP here in order to force resolution of the
 638                  * reference operand to an actual integer.
 639                  */
 640                 status =
 641                     acpi_ex_resolve_operands(AML_LNOT_OP, &temp_desc,
 642                                              walk_state);
 643                 if (ACPI_FAILURE(status)) {
 644                         ACPI_EXCEPTION((AE_INFO, status,
 645                                         "While resolving operands for [%s]",
 646                                         acpi_ps_get_opcode_name(walk_state->
 647                                                                 opcode)));
 648
 649                         goto cleanup;
 650                 }
 651
 652                 /*
 653                  * temp_desc is now guaranteed to be an Integer object --
 654                  * Perform the actual increment or decrement
 655                  */
 656                 if (walk_state->opcode == AML_INCREMENT_OP) {
 657                         return_desc->integer.value =
 658                             temp_desc->integer.value + 1;
 659                 } else {
 660                         return_desc->integer.value =
 661                             temp_desc->integer.value - 1;
 662                 }
 663
 664                 /* Finished with this Integer object */
 665
 666                 acpi_ut_remove_reference(temp_desc);
 667
 668                 /*
 669                  * Store the result back (indirectly) through the original
 670                  * Reference object
 671                  */
 672                 status = acpi_ex_store(return_desc, operand[0], walk_state);
 673                 break;
 674
 675         case AML_TYPE_OP:       /* object_type (source_object) */
 676
 677                 /*
 678                  * Note: The operand is not resolved at this point because we want to
 679                  * get the associated object, not its value.  For example, we don't
 680                  * want to resolve a field_unit to its value, we want the actual
 681                  * field_unit object.
 682                  */
 683
 684                 /* Get the type of the base object */
 685
 686                 status =
 687                     acpi_ex_resolve_multiple(walk_state, operand[0], &type,
 688                                              NULL);
 689                 if (ACPI_FAILURE(status)) {
 690                         goto cleanup;
 691                 }
 692                 /* Allocate a descriptor to hold the type. */
 693
 694                 return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
 695                 if (!return_desc) {
 696                         status = AE_NO_MEMORY;
 697                         goto cleanup;
 698                 }
 699
 700                 return_desc->integer.value = type;
 701                 break;
 702
 703         case AML_SIZE_OF_OP:    /* size_of (source_object) */
 704
 705                 /*
 706                  * Note: The operand is not resolved at this point because we want to
 707                  * get the associated object, not its value.
 708                  */
 709
 710                 /* Get the base object */
 711
 712                 status = acpi_ex_resolve_multiple(walk_state,
 713                                                   operand[0], &type,
 714                                                   &temp_desc);
 715                 if (ACPI_FAILURE(status)) {
 716                         goto cleanup;
 717                 }
 718
 719                 /*
 720                  * The type of the base object must be integer, buffer, string, or
 721                  * package.  All others are not supported.
 722                  *
 723                  * NOTE: Integer is not specifically supported by the ACPI spec,
 724                  * but is supported implicitly via implicit operand conversion.
 725                  * rather than bother with conversion, we just use the byte width
 726                  * global (4 or 8 bytes).
 727                  */
 728                 switch (type) {
 729                 case ACPI_TYPE_INTEGER:
 730                         value = acpi_gbl_integer_byte_width;
 731                         break;
 732
 733                 case ACPI_TYPE_BUFFER:
 734                         value = temp_desc->buffer.length;
 735                         break;
 736
 737                 case ACPI_TYPE_STRING:
 738                         value = temp_desc->string.length;
 739                         break;
 740
 741                 case ACPI_TYPE_PACKAGE:
 742                         value = temp_desc->package.count;
 743                         break;
 744
 745                 default:
 746                         ACPI_ERROR((AE_INFO,
 747                                     "Operand is not Buf/Int/Str/Pkg - found type %s",
 748                                     acpi_ut_get_type_name(type)));
 749                         status = AE_AML_OPERAND_TYPE;
 750                         goto cleanup;
 751                 }
 752
 753                 /*
 754                  * Now that we have the size of the object, create a result
 755                  * object to hold the value
 756                  */
 757                 return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
 758                 if (!return_desc) {
 759                         status = AE_NO_MEMORY;
 760                         goto cleanup;
 761                 }
 762
 763                 return_desc->integer.value = value;
 764                 break;
 765
 766         case AML_REF_OF_OP:     /* ref_of (source_object) */
 767
 768                 status =
 769                     acpi_ex_get_object_reference(operand[0], &return_desc,
 770                                                  walk_state);
 771                 if (ACPI_FAILURE(status)) {
 772                         goto cleanup;
 773                 }
 774                 break;
 775
 776         case AML_DEREF_OF_OP:   /* deref_of (obj_reference | String) */
 777
 778                 /* Check for a method local or argument, or standalone String */
 779
 780                 if (ACPI_GET_DESCRIPTOR_TYPE(operand[0]) !=
 781                     ACPI_DESC_TYPE_NAMED) {
 782                         switch (ACPI_GET_OBJECT_TYPE(operand[0])) {
 783                         case ACPI_TYPE_LOCAL_REFERENCE:
 784                                 /*
 785                                  * This is a deref_of (local_x | arg_x)
 786                                  *
 787                                  * Must resolve/dereference the local/arg reference first
 788                                  */
 789                                 switch (operand[0]->reference.opcode) {
 790                                 case AML_LOCAL_OP:
 791                                 case AML_ARG_OP:
 792
 793                                         /* Set Operand[0] to the value of the local/arg */
 794
 795                                         status =
 796                                             acpi_ds_method_data_get_value
 797                                             (operand[0]->reference.opcode,
 798                                              operand[0]->reference.offset,
 799                                              walk_state, &temp_desc);
 800                                         if (ACPI_FAILURE(status)) {
 801                                                 goto cleanup;
 802                                         }
 803
 804                                         /*
 805                                          * Delete our reference to the input object and
 806                                          * point to the object just retrieved
 807                                          */
 808                                         acpi_ut_remove_reference(operand[0]);
 809                                         operand[0] = temp_desc;
 810                                         break;
 811
 812                                 case AML_REF_OF_OP:
 813
 814                                         /* Get the object to which the reference refers */
 815
 816                                         temp_desc =
 817                                             operand[0]->reference.object;
 818                                         acpi_ut_remove_reference(operand[0]);
 819                                         operand[0] = temp_desc;
 820                                         break;
 821
 822                                 default:
 823
 824                                         /* Must be an Index op - handled below */
 825                                         break;
 826                                 }
 827                                 break;
 828
 829                         case ACPI_TYPE_STRING:
 830
 831                                 /*
 832                                  * This is a deref_of (String). The string is a reference
 833                                  * to a named ACPI object.
 834                                  *
 835                                  * 1) Find the owning Node
 836                                  * 2) Dereference the node to an actual object.  Could be a
 837                                  *    Field, so we need to resolve the node to a value.
 838                                  */
 839                                 status =
 840                                     acpi_ns_get_node_by_path(operand[0]->string.
 841                                                              pointer,
 842                                                              walk_state->
 843                                                              scope_info->scope.
 844                                                              node,
 845                                                              ACPI_NS_SEARCH_PARENT,
 846                                                              ACPI_CAST_INDIRECT_PTR
 847                                                              (struct
 848                                                               acpi_namespace_node,
 849                                                               &return_desc));
 850                                 if (ACPI_FAILURE(status)) {
 851                                         goto cleanup;
 852                                 }
 853
 854                                 status =
 855                                     acpi_ex_resolve_node_to_value
 856                                     (ACPI_CAST_INDIRECT_PTR
 857                                      (struct acpi_namespace_node, &return_desc),
 858                                      walk_state);
 859                                 goto cleanup;
 860
 861                         default:
 862
 863                                 status = AE_AML_OPERAND_TYPE;
 864                                 goto cleanup;
 865                         }
 866                 }
 867
 868                 /* Operand[0] may have changed from the code above */
 869
 870                 if (ACPI_GET_DESCRIPTOR_TYPE(operand[0]) ==
 871                     ACPI_DESC_TYPE_NAMED) {
 872                         /*
 873                          * This is a deref_of (object_reference)
 874                          * Get the actual object from the Node (This is the dereference).
 875                          * This case may only happen when a local_x or arg_x is
 876                          * dereferenced above.
 877                          */
 878                         return_desc = acpi_ns_get_attached_object((struct
 879                                                                    acpi_namespace_node
 880                                                                    *)
 881                                                                   operand[0]);
 882                         acpi_ut_add_reference(return_desc);
 883                 } else {
 884                         /*
 885                          * This must be a reference object produced by either the
 886                          * Index() or ref_of() operator
 887                          */
 888                         switch (operand[0]->reference.opcode) {
 889                         case AML_INDEX_OP:
 890
 891                                 /*
 892                                  * The target type for the Index operator must be
 893                                  * either a Buffer or a Package
 894                                  */
 895                                 switch (operand[0]->reference.target_type) {
 896                                 case ACPI_TYPE_BUFFER_FIELD:
 897
 898                                         temp_desc =
 899                                             operand[0]->reference.object;
 900
 901                                         /*
 902                                          * Create a new object that contains one element of the
 903                                          * buffer -- the element pointed to by the index.
 904                                          *
 905                                          * NOTE: index into a buffer is NOT a pointer to a
 906                                          * sub-buffer of the main buffer, it is only a pointer to a
 907                                          * single element (byte) of the buffer!
 908                                          */
 909                                         return_desc =
 910                                             acpi_ut_create_internal_object
 911                                             (ACPI_TYPE_INTEGER);
 912                                         if (!return_desc) {
 913                                                 status = AE_NO_MEMORY;
 914                                                 goto cleanup;
 915                                         }
 916
 917                                         /*
 918                                          * Since we are returning the value of the buffer at the
 919                                          * indexed location, we don't need to add an additional
 920                                          * reference to the buffer itself.
 921                                          */
 922                                         return_desc->integer.value =
 923                                             temp_desc->buffer.
 924                                             pointer[operand[0]->reference.
 925                                                     offset];
 926                                         break;
 927
 928                                 case ACPI_TYPE_PACKAGE:
 929
 930                                         /*
 931                                          * Return the referenced element of the package.  We must
 932                                          * add another reference to the referenced object, however.
 933                                          */
 934                                         return_desc =
 935                                             *(operand[0]->reference.where);
 936                                         if (return_desc) {
 937                                                 acpi_ut_add_reference
 938                                                     (return_desc);
 939                                         }
 940
 941                                         break;
 942
 943                                 default:
 944
 945                                         ACPI_ERROR((AE_INFO,
 946                                                     "Unknown Index target_type %X in obj %p",
 947                                                     operand[0]->reference.
 948                                                     target_type, operand[0]));
 949                                         status = AE_AML_OPERAND_TYPE;
 950                                         goto cleanup;
 951                                 }
 952                                 break;
 953
 954                         case AML_REF_OF_OP:
 955
 956                                 return_desc = operand[0]->reference.object;
 957
 958                                 if (ACPI_GET_DESCRIPTOR_TYPE(return_desc) ==
 959                                     ACPI_DESC_TYPE_NAMED) {
 960
 961                                         return_desc =
 962                                             acpi_ns_get_attached_object((struct
 963                                                                          acpi_namespace_node
 964                                                                          *)
 965                                                                         return_desc);
 966                                 }
 967
 968                                 /* Add another reference to the object! */
 969
 970                                 acpi_ut_add_reference(return_desc);
 971                                 break;
 972
 973                         default:
 974                                 ACPI_ERROR((AE_INFO,
 975                                             "Unknown opcode in ref(%p) - %X",
 976                                             operand[0],
 977                                             operand[0]->reference.opcode));
 978
 979                                 status = AE_TYPE;
 980                                 goto cleanup;
 981                         }
 982                 }
 983                 break;
 984
 985         default:
 986
 987                 ACPI_ERROR((AE_INFO, "Unknown AML opcode %X",
 988                             walk_state->opcode));
 989                 status = AE_AML_BAD_OPCODE;
 990                 goto cleanup;
 991         }
 992
 993       cleanup:
 994
 995         /* Delete return object on error */
 996
 997         if (ACPI_FAILURE(status)) {
 998                 acpi_ut_remove_reference(return_desc);
 999         }
1000
1001         walk_state->result_obj = return_desc;
1002         return_ACPI_STATUS(status);
1003 }