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

   1
   2 /******************************************************************************
   3  *
   4  * Module Name: exmisc - ACPI AML (p-code) execution - specific opcodes
   5  *
   6  *****************************************************************************/
   7
   8 /*
   9  * Copyright (C) 2000 - 2005, 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/acinterp.h>
  47 #include <acpi/amlcode.h>
  48
  49 #define _COMPONENT          ACPI_EXECUTER
  50 ACPI_MODULE_NAME("exmisc")
  51
  52 /*******************************************************************************
  53  *
  54  * FUNCTION:    acpi_ex_get_object_reference
  55  *
  56  * PARAMETERS:  obj_desc            - Create a reference to this object
  57  *              return_desc         - Where to store the reference
  58  *              walk_state          - Current state
  59  *
  60  * RETURN:      Status
  61  *
  62  * DESCRIPTION: Obtain and return a "reference" to the target object
  63  *              Common code for the ref_of_op and the cond_ref_of_op.
  64  *
  65  ******************************************************************************/
  66 acpi_status
  67 acpi_ex_get_object_reference(union acpi_operand_object *obj_desc,
  68                              union acpi_operand_object **return_desc,
  69                              struct acpi_walk_state *walk_state)
  70 {
  71         union acpi_operand_object *reference_obj;
  72         union acpi_operand_object *referenced_obj;
  73
  74         ACPI_FUNCTION_TRACE_PTR("ex_get_object_reference", obj_desc);
  75
  76         *return_desc = NULL;
  77
  78         switch (ACPI_GET_DESCRIPTOR_TYPE(obj_desc)) {
  79         case ACPI_DESC_TYPE_OPERAND:
  80
  81                 if (ACPI_GET_OBJECT_TYPE(obj_desc) != ACPI_TYPE_LOCAL_REFERENCE) {
  82                         return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
  83                 }
  84
  85                 /*
  86                  * Must be a reference to a Local or Arg
  87                  */
  88                 switch (obj_desc->reference.opcode) {
  89                 case AML_LOCAL_OP:
  90                 case AML_ARG_OP:
  91                 case AML_DEBUG_OP:
  92
  93                         /* The referenced object is the pseudo-node for the local/arg */
  94
  95                         referenced_obj = obj_desc->reference.object;
  96                         break;
  97
  98                 default:
  99
 100                         ACPI_REPORT_ERROR(("Unknown Reference opcode in get_reference %X\n", obj_desc->reference.opcode));
 101                         return_ACPI_STATUS(AE_AML_INTERNAL);
 102                 }
 103                 break;
 104
 105         case ACPI_DESC_TYPE_NAMED:
 106
 107                 /*
 108                  * A named reference that has already been resolved to a Node
 109                  */
 110                 referenced_obj = obj_desc;
 111                 break;
 112
 113         default:
 114
 115                 ACPI_REPORT_ERROR(("Invalid descriptor type in get_reference: %X\n", ACPI_GET_DESCRIPTOR_TYPE(obj_desc)));
 116                 return_ACPI_STATUS(AE_TYPE);
 117         }
 118
 119         /* Create a new reference object */
 120
 121         reference_obj =
 122             acpi_ut_create_internal_object(ACPI_TYPE_LOCAL_REFERENCE);
 123         if (!reference_obj) {
 124                 return_ACPI_STATUS(AE_NO_MEMORY);
 125         }
 126
 127         reference_obj->reference.opcode = AML_REF_OF_OP;
 128         reference_obj->reference.object = referenced_obj;
 129         *return_desc = reference_obj;
 130
 131         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 132                           "Object %p Type [%s], returning Reference %p\n",
 133                           obj_desc, acpi_ut_get_object_type_name(obj_desc),
 134                           *return_desc));
 135
 136         return_ACPI_STATUS(AE_OK);
 137 }
 138
 139 /*******************************************************************************
 140  *
 141  * FUNCTION:    acpi_ex_concat_template
 142  *
 143  * PARAMETERS:  Operand0            - First source object
 144  *              Operand1            - Second source object
 145  *              actual_return_desc  - Where to place the return object
 146  *              walk_state          - Current walk state
 147  *
 148  * RETURN:      Status
 149  *
 150  * DESCRIPTION: Concatenate two resource templates
 151  *
 152  ******************************************************************************/
 153
 154 acpi_status
 155 acpi_ex_concat_template(union acpi_operand_object *operand0,
 156                         union acpi_operand_object *operand1,
 157                         union acpi_operand_object **actual_return_desc,
 158                         struct acpi_walk_state *walk_state)
 159 {
 160         union acpi_operand_object *return_desc;
 161         u8 *new_buf;
 162         u8 *end_tag1;
 163         u8 *end_tag2;
 164         acpi_size length1;
 165         acpi_size length2;
 166
 167         ACPI_FUNCTION_TRACE("ex_concat_template");
 168
 169         /* Find the end_tags in each resource template */
 170
 171         end_tag1 = acpi_ut_get_resource_end_tag(operand0);
 172         end_tag2 = acpi_ut_get_resource_end_tag(operand1);
 173         if (!end_tag1 || !end_tag2) {
 174                 return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 175         }
 176
 177         /* Compute the length of each part */
 178
 179         length1 = ACPI_PTR_DIFF(end_tag1, operand0->buffer.pointer);
 180         length2 = ACPI_PTR_DIFF(end_tag2, operand1->buffer.pointer) + 2;        /* Size of END_TAG */
 181
 182         /* Create a new buffer object for the result */
 183
 184         return_desc = acpi_ut_create_buffer_object(length1 + length2);
 185         if (!return_desc) {
 186                 return_ACPI_STATUS(AE_NO_MEMORY);
 187         }
 188
 189         /* Copy the templates to the new descriptor */
 190
 191         new_buf = return_desc->buffer.pointer;
 192         ACPI_MEMCPY(new_buf, operand0->buffer.pointer, length1);
 193         ACPI_MEMCPY(new_buf + length1, operand1->buffer.pointer, length2);
 194
 195         /* Compute the new checksum */
 196
 197         new_buf[return_desc->buffer.length - 1] =
 198             acpi_ut_generate_checksum(return_desc->buffer.pointer,
 199                                       (return_desc->buffer.length - 1));
 200
 201         /* Return the completed template descriptor */
 202
 203         *actual_return_desc = return_desc;
 204         return_ACPI_STATUS(AE_OK);
 205 }
 206
 207 /*******************************************************************************
 208  *
 209  * FUNCTION:    acpi_ex_do_concatenate
 210  *
 211  * PARAMETERS:  Operand0            - First source object
 212  *              Operand1            - Second source object
 213  *              actual_return_desc  - Where to place the return object
 214  *              walk_state          - Current walk state
 215  *
 216  * RETURN:      Status
 217  *
 218  * DESCRIPTION: Concatenate two objects OF THE SAME TYPE.
 219  *
 220  ******************************************************************************/
 221
 222 acpi_status
 223 acpi_ex_do_concatenate(union acpi_operand_object *operand0,
 224                        union acpi_operand_object *operand1,
 225                        union acpi_operand_object **actual_return_desc,
 226                        struct acpi_walk_state *walk_state)
 227 {
 228         union acpi_operand_object *local_operand1 = operand1;
 229         union acpi_operand_object *return_desc;
 230         char *new_buf;
 231         acpi_status status;
 232         acpi_size new_length;
 233
 234         ACPI_FUNCTION_TRACE("ex_do_concatenate");
 235
 236         /*
 237          * Convert the second operand if necessary.  The first operand
 238          * determines the type of the second operand, (See the Data Types
 239          * section of the ACPI specification.)  Both object types are
 240          * guaranteed to be either Integer/String/Buffer by the operand
 241          * resolution mechanism.
 242          */
 243         switch (ACPI_GET_OBJECT_TYPE(operand0)) {
 244         case ACPI_TYPE_INTEGER:
 245                 status =
 246                     acpi_ex_convert_to_integer(operand1, &local_operand1, 16);
 247                 break;
 248
 249         case ACPI_TYPE_STRING:
 250                 status = acpi_ex_convert_to_string(operand1, &local_operand1,
 251                                                    ACPI_IMPLICIT_CONVERT_HEX);
 252                 break;
 253
 254         case ACPI_TYPE_BUFFER:
 255                 status = acpi_ex_convert_to_buffer(operand1, &local_operand1);
 256                 break;
 257
 258         default:
 259                 ACPI_REPORT_ERROR(("Concat - invalid obj type: %X\n",
 260                                    ACPI_GET_OBJECT_TYPE(operand0)));
 261                 status = AE_AML_INTERNAL;
 262         }
 263
 264         if (ACPI_FAILURE(status)) {
 265                 goto cleanup;
 266         }
 267
 268         /*
 269          * Both operands are now known to be the same object type
 270          * (Both are Integer, String, or Buffer), and we can now perform the
 271          * concatenation.
 272          */
 273
 274         /*
 275          * There are three cases to handle:
 276          *
 277          * 1) Two Integers concatenated to produce a new Buffer
 278          * 2) Two Strings concatenated to produce a new String
 279          * 3) Two Buffers concatenated to produce a new Buffer
 280          */
 281         switch (ACPI_GET_OBJECT_TYPE(operand0)) {
 282         case ACPI_TYPE_INTEGER:
 283
 284                 /* Result of two Integers is a Buffer */
 285                 /* Need enough buffer space for two integers */
 286
 287                 return_desc = acpi_ut_create_buffer_object((acpi_size)
 288                                                            ACPI_MUL_2
 289                                                            (acpi_gbl_integer_byte_width));
 290                 if (!return_desc) {
 291                         status = AE_NO_MEMORY;
 292                         goto cleanup;
 293                 }
 294
 295                 new_buf = (char *)return_desc->buffer.pointer;
 296
 297                 /* Copy the first integer, LSB first */
 298
 299                 ACPI_MEMCPY(new_buf,
 300                             &operand0->integer.value,
 301                             acpi_gbl_integer_byte_width);
 302
 303                 /* Copy the second integer (LSB first) after the first */
 304
 305                 ACPI_MEMCPY(new_buf + acpi_gbl_integer_byte_width,
 306                             &local_operand1->integer.value,
 307                             acpi_gbl_integer_byte_width);
 308                 break;
 309
 310         case ACPI_TYPE_STRING:
 311
 312                 /* Result of two Strings is a String */
 313
 314                 new_length = (acpi_size) operand0->string.length +
 315                     (acpi_size) local_operand1->string.length;
 316                 if (new_length > ACPI_MAX_STRING_CONVERSION) {
 317                         status = AE_AML_STRING_LIMIT;
 318                         goto cleanup;
 319                 }
 320
 321                 return_desc = acpi_ut_create_string_object(new_length);
 322                 if (!return_desc) {
 323                         status = AE_NO_MEMORY;
 324                         goto cleanup;
 325                 }
 326
 327                 new_buf = return_desc->string.pointer;
 328
 329                 /* Concatenate the strings */
 330
 331                 ACPI_STRCPY(new_buf, operand0->string.pointer);
 332                 ACPI_STRCPY(new_buf + operand0->string.length,
 333                             local_operand1->string.pointer);
 334                 break;
 335
 336         case ACPI_TYPE_BUFFER:
 337
 338                 /* Result of two Buffers is a Buffer */
 339
 340                 return_desc = acpi_ut_create_buffer_object((acpi_size)
 341                                                            operand0->buffer.
 342                                                            length +
 343                                                            (acpi_size)
 344                                                            local_operand1->
 345                                                            buffer.length);
 346                 if (!return_desc) {
 347                         status = AE_NO_MEMORY;
 348                         goto cleanup;
 349                 }
 350
 351                 new_buf = (char *)return_desc->buffer.pointer;
 352
 353                 /* Concatenate the buffers */
 354
 355                 ACPI_MEMCPY(new_buf,
 356                             operand0->buffer.pointer, operand0->buffer.length);
 357                 ACPI_MEMCPY(new_buf + operand0->buffer.length,
 358                             local_operand1->buffer.pointer,
 359                             local_operand1->buffer.length);
 360                 break;
 361
 362         default:
 363
 364                 /* Invalid object type, should not happen here */
 365
 366                 ACPI_REPORT_ERROR(("Concatenate - Invalid object type: %X\n",
 367                                    ACPI_GET_OBJECT_TYPE(operand0)));
 368                 status = AE_AML_INTERNAL;
 369                 goto cleanup;
 370         }
 371
 372         *actual_return_desc = return_desc;
 373
 374       cleanup:
 375         if (local_operand1 != operand1) {
 376                 acpi_ut_remove_reference(local_operand1);
 377         }
 378         return_ACPI_STATUS(status);
 379 }
 380
 381 /*******************************************************************************
 382  *
 383  * FUNCTION:    acpi_ex_do_math_op
 384  *
 385  * PARAMETERS:  Opcode              - AML opcode
 386  *              Integer0            - Integer operand #0
 387  *              Integer1            - Integer operand #1
 388  *
 389  * RETURN:      Integer result of the operation
 390  *
 391  * DESCRIPTION: Execute a math AML opcode. The purpose of having all of the
 392  *              math functions here is to prevent a lot of pointer dereferencing
 393  *              to obtain the operands.
 394  *
 395  ******************************************************************************/
 396
 397 acpi_integer
 398 acpi_ex_do_math_op(u16 opcode, acpi_integer integer0, acpi_integer integer1)
 399 {
 400
 401         ACPI_FUNCTION_ENTRY();
 402
 403         switch (opcode) {
 404         case AML_ADD_OP:        /* Add (Integer0, Integer1, Result) */
 405
 406                 return (integer0 + integer1);
 407
 408         case AML_BIT_AND_OP:    /* And (Integer0, Integer1, Result) */
 409
 410                 return (integer0 & integer1);
 411
 412         case AML_BIT_NAND_OP:   /* NAnd (Integer0, Integer1, Result) */
 413
 414                 return (~(integer0 & integer1));
 415
 416         case AML_BIT_OR_OP:     /* Or (Integer0, Integer1, Result) */
 417
 418                 return (integer0 | integer1);
 419
 420         case AML_BIT_NOR_OP:    /* NOr (Integer0, Integer1, Result) */
 421
 422                 return (~(integer0 | integer1));
 423
 424         case AML_BIT_XOR_OP:    /* XOr (Integer0, Integer1, Result) */
 425
 426                 return (integer0 ^ integer1);
 427
 428         case AML_MULTIPLY_OP:   /* Multiply (Integer0, Integer1, Result) */
 429
 430                 return (integer0 * integer1);
 431
 432         case AML_SHIFT_LEFT_OP: /* shift_left (Operand, shift_count, Result) */
 433
 434                 return (integer0 << integer1);
 435
 436         case AML_SHIFT_RIGHT_OP:        /* shift_right (Operand, shift_count, Result) */
 437
 438                 return (integer0 >> integer1);
 439
 440         case AML_SUBTRACT_OP:   /* Subtract (Integer0, Integer1, Result) */
 441
 442                 return (integer0 - integer1);
 443
 444         default:
 445
 446                 return (0);
 447         }
 448 }
 449
 450 /*******************************************************************************
 451  *
 452  * FUNCTION:    acpi_ex_do_logical_numeric_op
 453  *
 454  * PARAMETERS:  Opcode              - AML opcode
 455  *              Integer0            - Integer operand #0
 456  *              Integer1            - Integer operand #1
 457  *              logical_result      - TRUE/FALSE result of the operation
 458  *
 459  * RETURN:      Status
 460  *
 461  * DESCRIPTION: Execute a logical "Numeric" AML opcode. For these Numeric
 462  *              operators (LAnd and LOr), both operands must be integers.
 463  *
 464  *              Note: cleanest machine code seems to be produced by the code
 465  *              below, rather than using statements of the form:
 466  *                  Result = (Integer0 && Integer1);
 467  *
 468  ******************************************************************************/
 469
 470 acpi_status
 471 acpi_ex_do_logical_numeric_op(u16 opcode,
 472                               acpi_integer integer0,
 473                               acpi_integer integer1, u8 * logical_result)
 474 {
 475         acpi_status status = AE_OK;
 476         u8 local_result = FALSE;
 477
 478         ACPI_FUNCTION_TRACE("ex_do_logical_numeric_op");
 479
 480         switch (opcode) {
 481         case AML_LAND_OP:       /* LAnd (Integer0, Integer1) */
 482
 483                 if (integer0 && integer1) {
 484                         local_result = TRUE;
 485                 }
 486                 break;
 487
 488         case AML_LOR_OP:        /* LOr (Integer0, Integer1) */
 489
 490                 if (integer0 || integer1) {
 491                         local_result = TRUE;
 492                 }
 493                 break;
 494
 495         default:
 496                 status = AE_AML_INTERNAL;
 497                 break;
 498         }
 499
 500         /* Return the logical result and status */
 501
 502         *logical_result = local_result;
 503         return_ACPI_STATUS(status);
 504 }
 505
 506 /*******************************************************************************
 507  *
 508  * FUNCTION:    acpi_ex_do_logical_op
 509  *
 510  * PARAMETERS:  Opcode              - AML opcode
 511  *              Operand0            - operand #0
 512  *              Operand1            - operand #1
 513  *              logical_result      - TRUE/FALSE result of the operation
 514  *
 515  * RETURN:      Status
 516  *
 517  * DESCRIPTION: Execute a logical AML opcode. The purpose of having all of the
 518  *              functions here is to prevent a lot of pointer dereferencing
 519  *              to obtain the operands and to simplify the generation of the
 520  *              logical value. For the Numeric operators (LAnd and LOr), both
 521  *              operands must be integers. For the other logical operators,
 522  *              operands can be any combination of Integer/String/Buffer. The
 523  *              first operand determines the type to which the second operand
 524  *              will be converted.
 525  *
 526  *              Note: cleanest machine code seems to be produced by the code
 527  *              below, rather than using statements of the form:
 528  *                  Result = (Operand0 == Operand1);
 529  *
 530  ******************************************************************************/
 531
 532 acpi_status
 533 acpi_ex_do_logical_op(u16 opcode,
 534                       union acpi_operand_object *operand0,
 535                       union acpi_operand_object *operand1, u8 * logical_result)
 536 {
 537         union acpi_operand_object *local_operand1 = operand1;
 538         acpi_integer integer0;
 539         acpi_integer integer1;
 540         u32 length0;
 541         u32 length1;
 542         acpi_status status = AE_OK;
 543         u8 local_result = FALSE;
 544         int compare;
 545
 546         ACPI_FUNCTION_TRACE("ex_do_logical_op");
 547
 548         /*
 549          * Convert the second operand if necessary.  The first operand
 550          * determines the type of the second operand, (See the Data Types
 551          * section of the ACPI 3.0+ specification.)  Both object types are
 552          * guaranteed to be either Integer/String/Buffer by the operand
 553          * resolution mechanism.
 554          */
 555         switch (ACPI_GET_OBJECT_TYPE(operand0)) {
 556         case ACPI_TYPE_INTEGER:
 557                 status =
 558                     acpi_ex_convert_to_integer(operand1, &local_operand1, 16);
 559                 break;
 560
 561         case ACPI_TYPE_STRING:
 562                 status = acpi_ex_convert_to_string(operand1, &local_operand1,
 563                                                    ACPI_IMPLICIT_CONVERT_HEX);
 564                 break;
 565
 566         case ACPI_TYPE_BUFFER:
 567                 status = acpi_ex_convert_to_buffer(operand1, &local_operand1);
 568                 break;
 569
 570         default:
 571                 status = AE_AML_INTERNAL;
 572                 break;
 573         }
 574
 575         if (ACPI_FAILURE(status)) {
 576                 goto cleanup;
 577         }
 578
 579         /*
 580          * Two cases: 1) Both Integers, 2) Both Strings or Buffers
 581          */
 582         if (ACPI_GET_OBJECT_TYPE(operand0) == ACPI_TYPE_INTEGER) {
 583                 /*
 584                  * 1) Both operands are of type integer
 585                  *    Note: local_operand1 may have changed above
 586                  */
 587                 integer0 = operand0->integer.value;
 588                 integer1 = local_operand1->integer.value;
 589
 590                 switch (opcode) {
 591                 case AML_LEQUAL_OP:     /* LEqual (Operand0, Operand1) */
 592
 593                         if (integer0 == integer1) {
 594                                 local_result = TRUE;
 595                         }
 596                         break;
 597
 598                 case AML_LGREATER_OP:   /* LGreater (Operand0, Operand1) */
 599
 600                         if (integer0 > integer1) {
 601                                 local_result = TRUE;
 602                         }
 603                         break;
 604
 605                 case AML_LLESS_OP:      /* LLess (Operand0, Operand1) */
 606
 607                         if (integer0 < integer1) {
 608                                 local_result = TRUE;
 609                         }
 610                         break;
 611
 612                 default:
 613                         status = AE_AML_INTERNAL;
 614                         break;
 615                 }
 616         } else {
 617                 /*
 618                  * 2) Both operands are Strings or both are Buffers
 619                  *    Note: Code below takes advantage of common Buffer/String
 620                  *          object fields. local_operand1 may have changed above. Use
 621                  *          memcmp to handle nulls in buffers.
 622                  */
 623                 length0 = operand0->buffer.length;
 624                 length1 = local_operand1->buffer.length;
 625
 626                 /* Lexicographic compare: compare the data bytes */
 627
 628                 compare = ACPI_MEMCMP((const char *)operand0->buffer.pointer,
 629                                       (const char *)local_operand1->buffer.
 630                                       pointer,
 631                                       (length0 > length1) ? length1 : length0);
 632
 633                 switch (opcode) {
 634                 case AML_LEQUAL_OP:     /* LEqual (Operand0, Operand1) */
 635
 636                         /* Length and all bytes must be equal */
 637
 638                         if ((length0 == length1) && (compare == 0)) {
 639                                 /* Length and all bytes match ==> TRUE */
 640
 641                                 local_result = TRUE;
 642                         }
 643                         break;
 644
 645                 case AML_LGREATER_OP:   /* LGreater (Operand0, Operand1) */
 646
 647                         if (compare > 0) {
 648                                 local_result = TRUE;
 649                                 goto cleanup;   /* TRUE */
 650                         }
 651                         if (compare < 0) {
 652                                 goto cleanup;   /* FALSE */
 653                         }
 654
 655                         /* Bytes match (to shortest length), compare lengths */
 656
 657                         if (length0 > length1) {
 658                                 local_result = TRUE;
 659                         }
 660                         break;
 661
 662                 case AML_LLESS_OP:      /* LLess (Operand0, Operand1) */
 663
 664                         if (compare > 0) {
 665                                 goto cleanup;   /* FALSE */
 666                         }
 667                         if (compare < 0) {
 668                                 local_result = TRUE;
 669                                 goto cleanup;   /* TRUE */
 670                         }
 671
 672                         /* Bytes match (to shortest length), compare lengths */
 673
 674                         if (length0 < length1) {
 675                                 local_result = TRUE;
 676                         }
 677                         break;
 678
 679                 default:
 680                         status = AE_AML_INTERNAL;
 681                         break;
 682                 }
 683         }
 684
 685       cleanup:
 686
 687         /* New object was created if implicit conversion performed - delete */
 688
 689         if (local_operand1 != operand1) {
 690                 acpi_ut_remove_reference(local_operand1);
 691         }
 692
 693         /* Return the logical result and status */
 694
 695         *logical_result = local_result;
 696         return_ACPI_STATUS(status);
 697 }