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_REPORT_ERROR(("Unknown AML opcode %X\n",
 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_REPORT_ERROR(("Unknown AML opcode %X\n",
 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_REPORT_ERROR(("Unknown AML opcode %X\n",
 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_REPORT_ERROR(("BCD digit too large (not decimal): 0x%X\n", temp32));
 353
 354                                         status = AE_AML_NUMERIC_OVERFLOW;
 355                                         goto cleanup;
 356                                 }
 357
 358                                 /* Sum the digit into the result with the current power of 10 */
 359
 360                                 return_desc->integer.value +=
 361                                     (((acpi_integer) temp32) * power_of_ten);
 362
 363                                 /* Shift to next BCD digit */
 364
 365                                 digit >>= 4;
 366
 367                                 /* Next power of 10 */
 368
 369                                 power_of_ten *= 10;
 370                         }
 371                         break;
 372
 373                 case AML_TO_BCD_OP:     /* to_bcd (Operand, Result) */
 374
 375                         return_desc->integer.value = 0;
 376                         digit = operand[0]->integer.value;
 377
 378                         /* Each BCD digit is one nybble wide */
 379
 380                         for (i = 0;
 381                              (i < acpi_gbl_integer_nybble_width) && (digit > 0);
 382                              i++) {
 383                                 (void)acpi_ut_short_divide(digit, 10, &digit,
 384                                                            &temp32);
 385
 386                                 /*
 387                                  * Insert the BCD digit that resides in the
 388                                  * remainder from above
 389                                  */
 390                                 return_desc->integer.value |=
 391                                     (((acpi_integer) temp32) << ACPI_MUL_4(i));
 392                         }
 393
 394                         /* Overflow if there is any data left in Digit */
 395
 396                         if (digit > 0) {
 397                                 ACPI_REPORT_ERROR(("Integer too large to convert to BCD: %8.8X%8.8X\n", ACPI_FORMAT_UINT64(operand[0]->integer.value)));
 398                                 status = AE_AML_NUMERIC_OVERFLOW;
 399                                 goto cleanup;
 400                         }
 401                         break;
 402
 403                 case AML_COND_REF_OF_OP:        /* cond_ref_of (source_object, Result) */
 404
 405                         /*
 406                          * This op is a little strange because the internal return value is
 407                          * different than the return value stored in the result descriptor
 408                          * (There are really two return values)
 409                          */
 410                         if ((struct acpi_namespace_node *)operand[0] ==
 411                             acpi_gbl_root_node) {
 412                                 /*
 413                                  * This means that the object does not exist in the namespace,
 414                                  * return FALSE
 415                                  */
 416                                 return_desc->integer.value = 0;
 417                                 goto cleanup;
 418                         }
 419
 420                         /* Get the object reference, store it, and remove our reference */
 421
 422                         status = acpi_ex_get_object_reference(operand[0],
 423                                                               &return_desc2,
 424                                                               walk_state);
 425                         if (ACPI_FAILURE(status)) {
 426                                 goto cleanup;
 427                         }
 428
 429                         status =
 430                             acpi_ex_store(return_desc2, operand[1], walk_state);
 431                         acpi_ut_remove_reference(return_desc2);
 432
 433                         /* The object exists in the namespace, return TRUE */
 434
 435                         return_desc->integer.value = ACPI_INTEGER_MAX;
 436                         goto cleanup;
 437
 438                 default:
 439                         /* No other opcodes get here */
 440                         break;
 441                 }
 442                 break;
 443
 444         case AML_STORE_OP:      /* Store (Source, Target) */
 445
 446                 /*
 447                  * A store operand is typically a number, string, buffer or lvalue
 448                  * Be careful about deleting the source object,
 449                  * since the object itself may have been stored.
 450                  */
 451                 status = acpi_ex_store(operand[0], operand[1], walk_state);
 452                 if (ACPI_FAILURE(status)) {
 453                         return_ACPI_STATUS(status);
 454                 }
 455
 456                 /* It is possible that the Store already produced a return object */
 457
 458                 if (!walk_state->result_obj) {
 459                         /*
 460                          * Normally, we would remove a reference on the Operand[0]
 461                          * parameter; But since it is being used as the internal return
 462                          * object (meaning we would normally increment it), the two
 463                          * cancel out, and we simply don't do anything.
 464                          */
 465                         walk_state->result_obj = operand[0];
 466                         walk_state->operands[0] = NULL; /* Prevent deletion */
 467                 }
 468                 return_ACPI_STATUS(status);
 469
 470                 /*
 471                  * ACPI 2.0 Opcodes
 472                  */
 473         case AML_COPY_OP:       /* Copy (Source, Target) */
 474
 475                 status =
 476                     acpi_ut_copy_iobject_to_iobject(operand[0], &return_desc,
 477                                                     walk_state);
 478                 break;
 479
 480         case AML_TO_DECSTRING_OP:       /* to_decimal_string (Data, Result) */
 481
 482                 status = acpi_ex_convert_to_string(operand[0], &return_desc,
 483                                                    ACPI_EXPLICIT_CONVERT_DECIMAL);
 484                 if (return_desc == operand[0]) {
 485                         /* No conversion performed, add ref to handle return value */
 486                         acpi_ut_add_reference(return_desc);
 487                 }
 488                 break;
 489
 490         case AML_TO_HEXSTRING_OP:       /* to_hex_string (Data, Result) */
 491
 492                 status = acpi_ex_convert_to_string(operand[0], &return_desc,
 493                                                    ACPI_EXPLICIT_CONVERT_HEX);
 494                 if (return_desc == operand[0]) {
 495                         /* No conversion performed, add ref to handle return value */
 496                         acpi_ut_add_reference(return_desc);
 497                 }
 498                 break;
 499
 500         case AML_TO_BUFFER_OP:  /* to_buffer (Data, Result) */
 501
 502                 status = acpi_ex_convert_to_buffer(operand[0], &return_desc);
 503                 if (return_desc == operand[0]) {
 504                         /* No conversion performed, add ref to handle return value */
 505                         acpi_ut_add_reference(return_desc);
 506                 }
 507                 break;
 508
 509         case AML_TO_INTEGER_OP: /* to_integer (Data, Result) */
 510
 511                 status = acpi_ex_convert_to_integer(operand[0], &return_desc,
 512                                                     ACPI_ANY_BASE);
 513                 if (return_desc == operand[0]) {
 514                         /* No conversion performed, add ref to handle return value */
 515                         acpi_ut_add_reference(return_desc);
 516                 }
 517                 break;
 518
 519         case AML_SHIFT_LEFT_BIT_OP:     /* shift_left_bit (Source, bit_num) */
 520         case AML_SHIFT_RIGHT_BIT_OP:    /* shift_right_bit (Source, bit_num) */
 521
 522                 /* These are two obsolete opcodes */
 523
 524                 ACPI_REPORT_ERROR(("%s is obsolete and not implemented\n",
 525                                    acpi_ps_get_opcode_name(walk_state->
 526                                                            opcode)));
 527                 status = AE_SUPPORT;
 528                 goto cleanup;
 529
 530         default:                /* Unknown opcode */
 531
 532                 ACPI_REPORT_ERROR(("Unknown AML opcode %X\n",
 533                                    walk_state->opcode));
 534                 status = AE_AML_BAD_OPCODE;
 535                 goto cleanup;
 536         }
 537
 538         if (ACPI_SUCCESS(status)) {
 539                 /* Store the return value computed above into the target object */
 540
 541                 status = acpi_ex_store(return_desc, operand[1], walk_state);
 542         }
 543
 544       cleanup:
 545
 546         if (!walk_state->result_obj) {
 547                 walk_state->result_obj = return_desc;
 548         }
 549
 550         /* Delete return object on error */
 551
 552         if (ACPI_FAILURE(status)) {
 553                 acpi_ut_remove_reference(return_desc);
 554         }
 555
 556         return_ACPI_STATUS(status);
 557 }
 558
 559 /*******************************************************************************
 560  *
 561  * FUNCTION:    acpi_ex_opcode_1A_0T_1R
 562  *
 563  * PARAMETERS:  walk_state          - Current state (contains AML opcode)
 564  *
 565  * RETURN:      Status
 566  *
 567  * DESCRIPTION: Execute opcode with one argument, no target, and a return value
 568  *
 569  ******************************************************************************/
 570
 571 acpi_status acpi_ex_opcode_1A_0T_1R(struct acpi_walk_state *walk_state)
 572 {
 573         union acpi_operand_object **operand = &walk_state->operands[0];
 574         union acpi_operand_object *temp_desc;
 575         union acpi_operand_object *return_desc = NULL;
 576         acpi_status status = AE_OK;
 577         u32 type;
 578         acpi_integer value;
 579
 580         ACPI_FUNCTION_TRACE_STR("ex_opcode_1A_0T_1R",
 581                                 acpi_ps_get_opcode_name(walk_state->opcode));
 582
 583         /* Examine the AML opcode */
 584
 585         switch (walk_state->opcode) {
 586         case AML_LNOT_OP:       /* LNot (Operand) */
 587
 588                 return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
 589                 if (!return_desc) {
 590                         status = AE_NO_MEMORY;
 591                         goto cleanup;
 592                 }
 593
 594                 /*
 595                  * Set result to ONES (TRUE) if Value == 0.  Note:
 596                  * return_desc->Integer.Value is initially == 0 (FALSE) from above.
 597                  */
 598                 if (!operand[0]->integer.value) {
 599                         return_desc->integer.value = ACPI_INTEGER_MAX;
 600                 }
 601                 break;
 602
 603         case AML_DECREMENT_OP:  /* Decrement (Operand)  */
 604         case AML_INCREMENT_OP:  /* Increment (Operand)  */
 605
 606                 /*
 607                  * Create a new integer.  Can't just get the base integer and
 608                  * increment it because it may be an Arg or Field.
 609                  */
 610                 return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
 611                 if (!return_desc) {
 612                         status = AE_NO_MEMORY;
 613                         goto cleanup;
 614                 }
 615
 616                 /*
 617                  * Since we are expecting a Reference operand, it can be either a
 618                  * NS Node or an internal object.
 619                  */
 620                 temp_desc = operand[0];
 621                 if (ACPI_GET_DESCRIPTOR_TYPE(temp_desc) ==
 622                     ACPI_DESC_TYPE_OPERAND) {
 623                         /* Internal reference object - prevent deletion */
 624
 625                         acpi_ut_add_reference(temp_desc);
 626                 }
 627
 628                 /*
 629                  * Convert the Reference operand to an Integer (This removes a
 630                  * reference on the Operand[0] object)
 631                  *
 632                  * NOTE:  We use LNOT_OP here in order to force resolution of the
 633                  * reference operand to an actual integer.
 634                  */
 635                 status =
 636                     acpi_ex_resolve_operands(AML_LNOT_OP, &temp_desc,
 637                                              walk_state);
 638                 if (ACPI_FAILURE(status)) {
 639                         ACPI_REPORT_ERROR(("%s: bad operand(s) %s\n",
 640                                            acpi_ps_get_opcode_name(walk_state->
 641                                                                    opcode),
 642                                            acpi_format_exception(status)));
 643
 644                         goto cleanup;
 645                 }
 646
 647                 /*
 648                  * temp_desc is now guaranteed to be an Integer object --
 649                  * Perform the actual increment or decrement
 650                  */
 651                 if (walk_state->opcode == AML_INCREMENT_OP) {
 652                         return_desc->integer.value =
 653                             temp_desc->integer.value + 1;
 654                 } else {
 655                         return_desc->integer.value =
 656                             temp_desc->integer.value - 1;
 657                 }
 658
 659                 /* Finished with this Integer object */
 660
 661                 acpi_ut_remove_reference(temp_desc);
 662
 663                 /*
 664                  * Store the result back (indirectly) through the original
 665                  * Reference object
 666                  */
 667                 status = acpi_ex_store(return_desc, operand[0], walk_state);
 668                 break;
 669
 670         case AML_TYPE_OP:       /* object_type (source_object) */
 671
 672                 /*
 673                  * Note: The operand is not resolved at this point because we want to
 674                  * get the associated object, not its value.  For example, we don't
 675                  * want to resolve a field_unit to its value, we want the actual
 676                  * field_unit object.
 677                  */
 678
 679                 /* Get the type of the base object */
 680
 681                 status =
 682                     acpi_ex_resolve_multiple(walk_state, operand[0], &type,
 683                                              NULL);
 684                 if (ACPI_FAILURE(status)) {
 685                         goto cleanup;
 686                 }
 687                 /* Allocate a descriptor to hold the type. */
 688
 689                 return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
 690                 if (!return_desc) {
 691                         status = AE_NO_MEMORY;
 692                         goto cleanup;
 693                 }
 694
 695                 return_desc->integer.value = type;
 696                 break;
 697
 698         case AML_SIZE_OF_OP:    /* size_of (source_object) */
 699
 700                 /*
 701                  * Note: The operand is not resolved at this point because we want to
 702                  * get the associated object, not its value.
 703                  */
 704
 705                 /* Get the base object */
 706
 707                 status = acpi_ex_resolve_multiple(walk_state,
 708                                                   operand[0], &type,
 709                                                   &temp_desc);
 710                 if (ACPI_FAILURE(status)) {
 711                         goto cleanup;
 712                 }
 713
 714                 /*
 715                  * The type of the base object must be integer, buffer, string, or
 716                  * package.  All others are not supported.
 717                  *
 718                  * NOTE: Integer is not specifically supported by the ACPI spec,
 719                  * but is supported implicitly via implicit operand conversion.
 720                  * rather than bother with conversion, we just use the byte width
 721                  * global (4 or 8 bytes).
 722                  */
 723                 switch (type) {
 724                 case ACPI_TYPE_INTEGER:
 725                         value = acpi_gbl_integer_byte_width;
 726                         break;
 727
 728                 case ACPI_TYPE_BUFFER:
 729                         value = temp_desc->buffer.length;
 730                         break;
 731
 732                 case ACPI_TYPE_STRING:
 733                         value = temp_desc->string.length;
 734                         break;
 735
 736                 case ACPI_TYPE_PACKAGE:
 737                         value = temp_desc->package.count;
 738                         break;
 739
 740                 default:
 741                         ACPI_REPORT_ERROR(("Operand is not Buf/Int/Str/Pkg - found type %s\n", acpi_ut_get_type_name(type)));
 742                         status = AE_AML_OPERAND_TYPE;
 743                         goto cleanup;
 744                 }
 745
 746                 /*
 747                  * Now that we have the size of the object, create a result
 748                  * object to hold the value
 749                  */
 750                 return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
 751                 if (!return_desc) {
 752                         status = AE_NO_MEMORY;
 753                         goto cleanup;
 754                 }
 755
 756                 return_desc->integer.value = value;
 757                 break;
 758
 759         case AML_REF_OF_OP:     /* ref_of (source_object) */
 760
 761                 status =
 762                     acpi_ex_get_object_reference(operand[0], &return_desc,
 763                                                  walk_state);
 764                 if (ACPI_FAILURE(status)) {
 765                         goto cleanup;
 766                 }
 767                 break;
 768
 769         case AML_DEREF_OF_OP:   /* deref_of (obj_reference | String) */
 770
 771                 /* Check for a method local or argument, or standalone String */
 772
 773                 if (ACPI_GET_DESCRIPTOR_TYPE(operand[0]) !=
 774                     ACPI_DESC_TYPE_NAMED) {
 775                         switch (ACPI_GET_OBJECT_TYPE(operand[0])) {
 776                         case ACPI_TYPE_LOCAL_REFERENCE:
 777                                 /*
 778                                  * This is a deref_of (local_x | arg_x)
 779                                  *
 780                                  * Must resolve/dereference the local/arg reference first
 781                                  */
 782                                 switch (operand[0]->reference.opcode) {
 783                                 case AML_LOCAL_OP:
 784                                 case AML_ARG_OP:
 785
 786                                         /* Set Operand[0] to the value of the local/arg */
 787
 788                                         status =
 789                                             acpi_ds_method_data_get_value
 790                                             (operand[0]->reference.opcode,
 791                                              operand[0]->reference.offset,
 792                                              walk_state, &temp_desc);
 793                                         if (ACPI_FAILURE(status)) {
 794                                                 goto cleanup;
 795                                         }
 796
 797                                         /*
 798                                          * Delete our reference to the input object and
 799                                          * point to the object just retrieved
 800                                          */
 801                                         acpi_ut_remove_reference(operand[0]);
 802                                         operand[0] = temp_desc;
 803                                         break;
 804
 805                                 case AML_REF_OF_OP:
 806
 807                                         /* Get the object to which the reference refers */
 808
 809                                         temp_desc =
 810                                             operand[0]->reference.object;
 811                                         acpi_ut_remove_reference(operand[0]);
 812                                         operand[0] = temp_desc;
 813                                         break;
 814
 815                                 default:
 816
 817                                         /* Must be an Index op - handled below */
 818                                         break;
 819                                 }
 820                                 break;
 821
 822                         case ACPI_TYPE_STRING:
 823
 824                                 /*
 825                                  * This is a deref_of (String). The string is a reference
 826                                  * to a named ACPI object.
 827                                  *
 828                                  * 1) Find the owning Node
 829                                  * 2) Dereference the node to an actual object.  Could be a
 830                                  *    Field, so we need to resolve the node to a value.
 831                                  */
 832                                 status =
 833                                     acpi_ns_get_node_by_path(operand[0]->string.
 834                                                              pointer,
 835                                                              walk_state->
 836                                                              scope_info->scope.
 837                                                              node,
 838                                                              ACPI_NS_SEARCH_PARENT,
 839                                                              ACPI_CAST_INDIRECT_PTR
 840                                                              (struct
 841                                                               acpi_namespace_node,
 842                                                               &return_desc));
 843                                 if (ACPI_FAILURE(status)) {
 844                                         goto cleanup;
 845                                 }
 846
 847                                 status =
 848                                     acpi_ex_resolve_node_to_value
 849                                     (ACPI_CAST_INDIRECT_PTR
 850                                      (struct acpi_namespace_node, &return_desc),
 851                                      walk_state);
 852                                 goto cleanup;
 853
 854                         default:
 855
 856                                 status = AE_AML_OPERAND_TYPE;
 857                                 goto cleanup;
 858                         }
 859                 }
 860
 861                 /* Operand[0] may have changed from the code above */
 862
 863                 if (ACPI_GET_DESCRIPTOR_TYPE(operand[0]) ==
 864                     ACPI_DESC_TYPE_NAMED) {
 865                         /*
 866                          * This is a deref_of (object_reference)
 867                          * Get the actual object from the Node (This is the dereference).
 868                          * This case may only happen when a local_x or arg_x is
 869                          * dereferenced above.
 870                          */
 871                         return_desc = acpi_ns_get_attached_object((struct
 872                                                                    acpi_namespace_node
 873                                                                    *)
 874                                                                   operand[0]);
 875                         acpi_ut_add_reference(return_desc);
 876                 } else {
 877                         /*
 878                          * This must be a reference object produced by either the
 879                          * Index() or ref_of() operator
 880                          */
 881                         switch (operand[0]->reference.opcode) {
 882                         case AML_INDEX_OP:
 883
 884                                 /*
 885                                  * The target type for the Index operator must be
 886                                  * either a Buffer or a Package
 887                                  */
 888                                 switch (operand[0]->reference.target_type) {
 889                                 case ACPI_TYPE_BUFFER_FIELD:
 890
 891                                         temp_desc =
 892                                             operand[0]->reference.object;
 893
 894                                         /*
 895                                          * Create a new object that contains one element of the
 896                                          * buffer -- the element pointed to by the index.
 897                                          *
 898                                          * NOTE: index into a buffer is NOT a pointer to a
 899                                          * sub-buffer of the main buffer, it is only a pointer to a
 900                                          * single element (byte) of the buffer!
 901                                          */
 902                                         return_desc =
 903                                             acpi_ut_create_internal_object
 904                                             (ACPI_TYPE_INTEGER);
 905                                         if (!return_desc) {
 906                                                 status = AE_NO_MEMORY;
 907                                                 goto cleanup;
 908                                         }
 909
 910                                         /*
 911                                          * Since we are returning the value of the buffer at the
 912                                          * indexed location, we don't need to add an additional
 913                                          * reference to the buffer itself.
 914                                          */
 915                                         return_desc->integer.value =
 916                                             temp_desc->buffer.
 917                                             pointer[operand[0]->reference.
 918                                                     offset];
 919                                         break;
 920
 921                                 case ACPI_TYPE_PACKAGE:
 922
 923                                         /*
 924                                          * Return the referenced element of the package.  We must
 925                                          * add another reference to the referenced object, however.
 926                                          */
 927                                         return_desc =
 928                                             *(operand[0]->reference.where);
 929                                         if (return_desc) {
 930                                                 acpi_ut_add_reference
 931                                                     (return_desc);
 932                                         }
 933
 934                                         break;
 935
 936                                 default:
 937
 938                                         ACPI_REPORT_ERROR(("Unknown Index target_type %X in obj %p\n", operand[0]->reference.target_type, operand[0]));
 939                                         status = AE_AML_OPERAND_TYPE;
 940                                         goto cleanup;
 941                                 }
 942                                 break;
 943
 944                         case AML_REF_OF_OP:
 945
 946                                 return_desc = operand[0]->reference.object;
 947
 948                                 if (ACPI_GET_DESCRIPTOR_TYPE(return_desc) ==
 949                                     ACPI_DESC_TYPE_NAMED) {
 950
 951                                         return_desc =
 952                                             acpi_ns_get_attached_object((struct
 953                                                                          acpi_namespace_node
 954                                                                          *)
 955                                                                         return_desc);
 956                                 }
 957
 958                                 /* Add another reference to the object! */
 959
 960                                 acpi_ut_add_reference(return_desc);
 961                                 break;
 962
 963                         default:
 964                                 ACPI_REPORT_ERROR(("Unknown opcode in ref(%p) - %X\n", operand[0], operand[0]->reference.opcode));
 965
 966                                 status = AE_TYPE;
 967                                 goto cleanup;
 968                         }
 969                 }
 970                 break;
 971
 972         default:
 973
 974                 ACPI_REPORT_ERROR(("Unknown AML opcode %X\n",
 975                                    walk_state->opcode));
 976                 status = AE_AML_BAD_OPCODE;
 977                 goto cleanup;
 978         }
 979
 980       cleanup:
 981
 982         /* Delete return object on error */
 983
 984         if (ACPI_FAILURE(status)) {
 985                 acpi_ut_remove_reference(return_desc);
 986         }
 987
 988         walk_state->result_obj = return_desc;
 989         return_ACPI_STATUS(status);
 990 }