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 - 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/acinterp.h>
  47 #include <acpi/amlcode.h>
  48 #include <acpi/amlresrc.h>
  49
  50 #define _COMPONENT          ACPI_EXECUTER
  51 ACPI_MODULE_NAME("exmisc")
  52
  53 /*******************************************************************************
  54  *
  55  * FUNCTION:    acpi_ex_get_object_reference
  56  *
  57  * PARAMETERS:  obj_desc            - Create a reference to this object
  58  *              return_desc         - Where to store the reference
  59  *              walk_state          - Current state
  60  *
  61  * RETURN:      Status
  62  *
  63  * DESCRIPTION: Obtain and return a "reference" to the target object
  64  *              Common code for the ref_of_op and the cond_ref_of_op.
  65  *
  66  ******************************************************************************/
  67 acpi_status
  68 acpi_ex_get_object_reference(union acpi_operand_object *obj_desc,
  69                              union acpi_operand_object **return_desc,
  70                              struct acpi_walk_state *walk_state)
  71 {
  72         union acpi_operand_object *reference_obj;
  73         union acpi_operand_object *referenced_obj;
  74
  75         ACPI_FUNCTION_TRACE_PTR("ex_get_object_reference", obj_desc);
  76
  77         *return_desc = NULL;
  78
  79         switch (ACPI_GET_DESCRIPTOR_TYPE(obj_desc)) {
  80         case ACPI_DESC_TYPE_OPERAND:
  81
  82                 if (ACPI_GET_OBJECT_TYPE(obj_desc) != ACPI_TYPE_LOCAL_REFERENCE) {
  83                         return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
  84                 }
  85
  86                 /*
  87                  * Must be a reference to a Local or Arg
  88                  */
  89                 switch (obj_desc->reference.opcode) {
  90                 case AML_LOCAL_OP:
  91                 case AML_ARG_OP:
  92                 case AML_DEBUG_OP:
  93
  94                         /* The referenced object is the pseudo-node for the local/arg */
  95
  96                         referenced_obj = obj_desc->reference.object;
  97                         break;
  98
  99                 default:
 100
 101                         ACPI_REPORT_ERROR(("Unknown Reference opcode %X\n",
 102                                            obj_desc->reference.opcode));
 103                         return_ACPI_STATUS(AE_AML_INTERNAL);
 104                 }
 105                 break;
 106
 107         case ACPI_DESC_TYPE_NAMED:
 108
 109                 /*
 110                  * A named reference that has already been resolved to a Node
 111                  */
 112                 referenced_obj = obj_desc;
 113                 break;
 114
 115         default:
 116
 117                 ACPI_REPORT_ERROR(("Invalid descriptor type %X\n",
 118                                    ACPI_GET_DESCRIPTOR_TYPE(obj_desc)));
 119                 return_ACPI_STATUS(AE_TYPE);
 120         }
 121
 122         /* Create a new reference object */
 123
 124         reference_obj =
 125             acpi_ut_create_internal_object(ACPI_TYPE_LOCAL_REFERENCE);
 126         if (!reference_obj) {
 127                 return_ACPI_STATUS(AE_NO_MEMORY);
 128         }
 129
 130         reference_obj->reference.opcode = AML_REF_OF_OP;
 131         reference_obj->reference.object = referenced_obj;
 132         *return_desc = reference_obj;
 133
 134         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 135                           "Object %p Type [%s], returning Reference %p\n",
 136                           obj_desc, acpi_ut_get_object_type_name(obj_desc),
 137                           *return_desc));
 138
 139         return_ACPI_STATUS(AE_OK);
 140 }
 141
 142 /*******************************************************************************
 143  *
 144  * FUNCTION:    acpi_ex_concat_template
 145  *
 146  * PARAMETERS:  Operand0            - First source object
 147  *              Operand1            - Second source object
 148  *              actual_return_desc  - Where to place the return object
 149  *              walk_state          - Current walk state
 150  *
 151  * RETURN:      Status
 152  *
 153  * DESCRIPTION: Concatenate two resource templates
 154  *
 155  ******************************************************************************/
 156
 157 acpi_status
 158 acpi_ex_concat_template(union acpi_operand_object *operand0,
 159                         union acpi_operand_object *operand1,
 160                         union acpi_operand_object **actual_return_desc,
 161                         struct acpi_walk_state *walk_state)
 162 {
 163         acpi_status status;
 164         union acpi_operand_object *return_desc;
 165         u8 *new_buf;
 166         u8 *end_tag;
 167         acpi_size length0;
 168         acpi_size length1;
 169
 170         ACPI_FUNCTION_TRACE("ex_concat_template");
 171
 172         /*
 173          * Find the end_tag descriptor in each resource template.
 174          * Note: returned pointers point TO the end_tag, not past it.
 175          *
 176          * Compute the length of each resource template
 177          */
 178         status = acpi_ut_get_resource_end_tag(operand0, &end_tag);
 179         if (ACPI_FAILURE(status)) {
 180                 return_ACPI_STATUS(status);
 181         }
 182
 183         length0 = ACPI_PTR_DIFF(end_tag, operand0->buffer.pointer);
 184
 185         status = acpi_ut_get_resource_end_tag(operand1, &end_tag);
 186         if (ACPI_FAILURE(status)) {
 187                 return_ACPI_STATUS(status);
 188         }
 189
 190         /* Include the end_tag in the second template length */
 191
 192         length1 = ACPI_PTR_DIFF(end_tag, operand1->buffer.pointer) +
 193             sizeof(struct aml_resource_end_tag);
 194
 195         /* Create a new buffer object for the result */
 196
 197         return_desc = acpi_ut_create_buffer_object(length0 + length1);
 198         if (!return_desc) {
 199                 return_ACPI_STATUS(AE_NO_MEMORY);
 200         }
 201
 202         /*
 203          * Copy the templates to the new buffer, 0 first, then 1 follows. One
 204          * end_tag descriptor is copied from Operand1.
 205          */
 206         new_buf = return_desc->buffer.pointer;
 207         ACPI_MEMCPY(new_buf, operand0->buffer.pointer, length0);
 208         ACPI_MEMCPY(new_buf + length0, operand1->buffer.pointer, length1);
 209
 210         /* Set the end_tag checksum to zero, means "ignore checksum" */
 211
 212         new_buf[return_desc->buffer.length - 1] = 0;
 213
 214         /* Return the completed resource template */
 215
 216         *actual_return_desc = return_desc;
 217         return_ACPI_STATUS(AE_OK);
 218 }
 219
 220 /*******************************************************************************
 221  *
 222  * FUNCTION:    acpi_ex_do_concatenate
 223  *
 224  * PARAMETERS:  Operand0            - First source object
 225  *              Operand1            - Second source object
 226  *              actual_return_desc  - Where to place the return object
 227  *              walk_state          - Current walk state
 228  *
 229  * RETURN:      Status
 230  *
 231  * DESCRIPTION: Concatenate two objects OF THE SAME TYPE.
 232  *
 233  ******************************************************************************/
 234
 235 acpi_status
 236 acpi_ex_do_concatenate(union acpi_operand_object *operand0,
 237                        union acpi_operand_object *operand1,
 238                        union acpi_operand_object **actual_return_desc,
 239                        struct acpi_walk_state *walk_state)
 240 {
 241         union acpi_operand_object *local_operand1 = operand1;
 242         union acpi_operand_object *return_desc;
 243         char *new_buf;
 244         acpi_status status;
 245
 246         ACPI_FUNCTION_TRACE("ex_do_concatenate");
 247
 248         /*
 249          * Convert the second operand if necessary.  The first operand
 250          * determines the type of the second operand, (See the Data Types
 251          * section of the ACPI specification.)  Both object types are
 252          * guaranteed to be either Integer/String/Buffer by the operand
 253          * resolution mechanism.
 254          */
 255         switch (ACPI_GET_OBJECT_TYPE(operand0)) {
 256         case ACPI_TYPE_INTEGER:
 257                 status =
 258                     acpi_ex_convert_to_integer(operand1, &local_operand1, 16);
 259                 break;
 260
 261         case ACPI_TYPE_STRING:
 262                 status = acpi_ex_convert_to_string(operand1, &local_operand1,
 263                                                    ACPI_IMPLICIT_CONVERT_HEX);
 264                 break;
 265
 266         case ACPI_TYPE_BUFFER:
 267                 status = acpi_ex_convert_to_buffer(operand1, &local_operand1);
 268                 break;
 269
 270         default:
 271                 ACPI_REPORT_ERROR(("Invalid object type: %X\n",
 272                                    ACPI_GET_OBJECT_TYPE(operand0)));
 273                 status = AE_AML_INTERNAL;
 274         }
 275
 276         if (ACPI_FAILURE(status)) {
 277                 goto cleanup;
 278         }
 279
 280         /*
 281          * Both operands are now known to be the same object type
 282          * (Both are Integer, String, or Buffer), and we can now perform the
 283          * concatenation.
 284          */
 285
 286         /*
 287          * There are three cases to handle:
 288          *
 289          * 1) Two Integers concatenated to produce a new Buffer
 290          * 2) Two Strings concatenated to produce a new String
 291          * 3) Two Buffers concatenated to produce a new Buffer
 292          */
 293         switch (ACPI_GET_OBJECT_TYPE(operand0)) {
 294         case ACPI_TYPE_INTEGER:
 295
 296                 /* Result of two Integers is a Buffer */
 297                 /* Need enough buffer space for two integers */
 298
 299                 return_desc = acpi_ut_create_buffer_object((acpi_size)
 300                                                            ACPI_MUL_2
 301                                                            (acpi_gbl_integer_byte_width));
 302                 if (!return_desc) {
 303                         status = AE_NO_MEMORY;
 304                         goto cleanup;
 305                 }
 306
 307                 new_buf = (char *)return_desc->buffer.pointer;
 308
 309                 /* Copy the first integer, LSB first */
 310
 311                 ACPI_MEMCPY(new_buf, &operand0->integer.value,
 312                             acpi_gbl_integer_byte_width);
 313
 314                 /* Copy the second integer (LSB first) after the first */
 315
 316                 ACPI_MEMCPY(new_buf + acpi_gbl_integer_byte_width,
 317                             &local_operand1->integer.value,
 318                             acpi_gbl_integer_byte_width);
 319                 break;
 320
 321         case ACPI_TYPE_STRING:
 322
 323                 /* Result of two Strings is a String */
 324
 325                 return_desc = acpi_ut_create_string_object((acpi_size)
 326                                                            (operand0->string.
 327                                                             length +
 328                                                             local_operand1->
 329                                                             string.length));
 330                 if (!return_desc) {
 331                         status = AE_NO_MEMORY;
 332                         goto cleanup;
 333                 }
 334
 335                 new_buf = return_desc->string.pointer;
 336
 337                 /* Concatenate the strings */
 338
 339                 ACPI_STRCPY(new_buf, operand0->string.pointer);
 340                 ACPI_STRCPY(new_buf + operand0->string.length,
 341                             local_operand1->string.pointer);
 342                 break;
 343
 344         case ACPI_TYPE_BUFFER:
 345
 346                 /* Result of two Buffers is a Buffer */
 347
 348                 return_desc = acpi_ut_create_buffer_object((acpi_size)
 349                                                            (operand0->buffer.
 350                                                             length +
 351                                                             local_operand1->
 352                                                             buffer.length));
 353                 if (!return_desc) {
 354                         status = AE_NO_MEMORY;
 355                         goto cleanup;
 356                 }
 357
 358                 new_buf = (char *)return_desc->buffer.pointer;
 359
 360                 /* Concatenate the buffers */
 361
 362                 ACPI_MEMCPY(new_buf, operand0->buffer.pointer,
 363                             operand0->buffer.length);
 364                 ACPI_MEMCPY(new_buf + operand0->buffer.length,
 365                             local_operand1->buffer.pointer,
 366                             local_operand1->buffer.length);
 367                 break;
 368
 369         default:
 370
 371                 /* Invalid object type, should not happen here */
 372
 373                 ACPI_REPORT_ERROR(("Invalid object type: %X\n",
 374                                    ACPI_GET_OBJECT_TYPE(operand0)));
 375                 status = AE_AML_INTERNAL;
 376                 goto cleanup;
 377         }
 378
 379         *actual_return_desc = return_desc;
 380
 381       cleanup:
 382         if (local_operand1 != operand1) {
 383                 acpi_ut_remove_reference(local_operand1);
 384         }
 385         return_ACPI_STATUS(status);
 386 }
 387
 388 /*******************************************************************************
 389  *
 390  * FUNCTION:    acpi_ex_do_math_op
 391  *
 392  * PARAMETERS:  Opcode              - AML opcode
 393  *              Integer0            - Integer operand #0
 394  *              Integer1            - Integer operand #1
 395  *
 396  * RETURN:      Integer result of the operation
 397  *
 398  * DESCRIPTION: Execute a math AML opcode. The purpose of having all of the
 399  *              math functions here is to prevent a lot of pointer dereferencing
 400  *              to obtain the operands.
 401  *
 402  ******************************************************************************/
 403
 404 acpi_integer
 405 acpi_ex_do_math_op(u16 opcode, acpi_integer integer0, acpi_integer integer1)
 406 {
 407
 408         ACPI_FUNCTION_ENTRY();
 409
 410         switch (opcode) {
 411         case AML_ADD_OP:        /* Add (Integer0, Integer1, Result) */
 412
 413                 return (integer0 + integer1);
 414
 415         case AML_BIT_AND_OP:    /* And (Integer0, Integer1, Result) */
 416
 417                 return (integer0 & integer1);
 418
 419         case AML_BIT_NAND_OP:   /* NAnd (Integer0, Integer1, Result) */
 420
 421                 return (~(integer0 & integer1));
 422
 423         case AML_BIT_OR_OP:     /* Or (Integer0, Integer1, Result) */
 424
 425                 return (integer0 | integer1);
 426
 427         case AML_BIT_NOR_OP:    /* NOr (Integer0, Integer1, Result) */
 428
 429                 return (~(integer0 | integer1));
 430
 431         case AML_BIT_XOR_OP:    /* XOr (Integer0, Integer1, Result) */
 432
 433                 return (integer0 ^ integer1);
 434
 435         case AML_MULTIPLY_OP:   /* Multiply (Integer0, Integer1, Result) */
 436
 437                 return (integer0 * integer1);
 438
 439         case AML_SHIFT_LEFT_OP: /* shift_left (Operand, shift_count, Result) */
 440
 441                 return (integer0 << integer1);
 442
 443         case AML_SHIFT_RIGHT_OP:        /* shift_right (Operand, shift_count, Result) */
 444
 445                 return (integer0 >> integer1);
 446
 447         case AML_SUBTRACT_OP:   /* Subtract (Integer0, Integer1, Result) */
 448
 449                 return (integer0 - integer1);
 450
 451         default:
 452
 453                 return (0);
 454         }
 455 }
 456
 457 /*******************************************************************************
 458  *
 459  * FUNCTION:    acpi_ex_do_logical_numeric_op
 460  *
 461  * PARAMETERS:  Opcode              - AML opcode
 462  *              Integer0            - Integer operand #0
 463  *              Integer1            - Integer operand #1
 464  *              logical_result      - TRUE/FALSE result of the operation
 465  *
 466  * RETURN:      Status
 467  *
 468  * DESCRIPTION: Execute a logical "Numeric" AML opcode. For these Numeric
 469  *              operators (LAnd and LOr), both operands must be integers.
 470  *
 471  *              Note: cleanest machine code seems to be produced by the code
 472  *              below, rather than using statements of the form:
 473  *                  Result = (Integer0 && Integer1);
 474  *
 475  ******************************************************************************/
 476
 477 acpi_status
 478 acpi_ex_do_logical_numeric_op(u16 opcode,
 479                               acpi_integer integer0,
 480                               acpi_integer integer1, u8 * logical_result)
 481 {
 482         acpi_status status = AE_OK;
 483         u8 local_result = FALSE;
 484
 485         ACPI_FUNCTION_TRACE("ex_do_logical_numeric_op");
 486
 487         switch (opcode) {
 488         case AML_LAND_OP:       /* LAnd (Integer0, Integer1) */
 489
 490                 if (integer0 && integer1) {
 491                         local_result = TRUE;
 492                 }
 493                 break;
 494
 495         case AML_LOR_OP:        /* LOr (Integer0, Integer1) */
 496
 497                 if (integer0 || integer1) {
 498                         local_result = TRUE;
 499                 }
 500                 break;
 501
 502         default:
 503                 status = AE_AML_INTERNAL;
 504                 break;
 505         }
 506
 507         /* Return the logical result and status */
 508
 509         *logical_result = local_result;
 510         return_ACPI_STATUS(status);
 511 }
 512
 513 /*******************************************************************************
 514  *
 515  * FUNCTION:    acpi_ex_do_logical_op
 516  *
 517  * PARAMETERS:  Opcode              - AML opcode
 518  *              Operand0            - operand #0
 519  *              Operand1            - operand #1
 520  *              logical_result      - TRUE/FALSE result of the operation
 521  *
 522  * RETURN:      Status
 523  *
 524  * DESCRIPTION: Execute a logical AML opcode. The purpose of having all of the
 525  *              functions here is to prevent a lot of pointer dereferencing
 526  *              to obtain the operands and to simplify the generation of the
 527  *              logical value. For the Numeric operators (LAnd and LOr), both
 528  *              operands must be integers. For the other logical operators,
 529  *              operands can be any combination of Integer/String/Buffer. The
 530  *              first operand determines the type to which the second operand
 531  *              will be converted.
 532  *
 533  *              Note: cleanest machine code seems to be produced by the code
 534  *              below, rather than using statements of the form:
 535  *                  Result = (Operand0 == Operand1);
 536  *
 537  ******************************************************************************/
 538
 539 acpi_status
 540 acpi_ex_do_logical_op(u16 opcode,
 541                       union acpi_operand_object *operand0,
 542                       union acpi_operand_object *operand1, u8 * logical_result)
 543 {
 544         union acpi_operand_object *local_operand1 = operand1;
 545         acpi_integer integer0;
 546         acpi_integer integer1;
 547         u32 length0;
 548         u32 length1;
 549         acpi_status status = AE_OK;
 550         u8 local_result = FALSE;
 551         int compare;
 552
 553         ACPI_FUNCTION_TRACE("ex_do_logical_op");
 554
 555         /*
 556          * Convert the second operand if necessary.  The first operand
 557          * determines the type of the second operand, (See the Data Types
 558          * section of the ACPI 3.0+ specification.)  Both object types are
 559          * guaranteed to be either Integer/String/Buffer by the operand
 560          * resolution mechanism.
 561          */
 562         switch (ACPI_GET_OBJECT_TYPE(operand0)) {
 563         case ACPI_TYPE_INTEGER:
 564                 status =
 565                     acpi_ex_convert_to_integer(operand1, &local_operand1, 16);
 566                 break;
 567
 568         case ACPI_TYPE_STRING:
 569                 status = acpi_ex_convert_to_string(operand1, &local_operand1,
 570                                                    ACPI_IMPLICIT_CONVERT_HEX);
 571                 break;
 572
 573         case ACPI_TYPE_BUFFER:
 574                 status = acpi_ex_convert_to_buffer(operand1, &local_operand1);
 575                 break;
 576
 577         default:
 578                 status = AE_AML_INTERNAL;
 579                 break;
 580         }
 581
 582         if (ACPI_FAILURE(status)) {
 583                 goto cleanup;
 584         }
 585
 586         /*
 587          * Two cases: 1) Both Integers, 2) Both Strings or Buffers
 588          */
 589         if (ACPI_GET_OBJECT_TYPE(operand0) == ACPI_TYPE_INTEGER) {
 590                 /*
 591                  * 1) Both operands are of type integer
 592                  *    Note: local_operand1 may have changed above
 593                  */
 594                 integer0 = operand0->integer.value;
 595                 integer1 = local_operand1->integer.value;
 596
 597                 switch (opcode) {
 598                 case AML_LEQUAL_OP:     /* LEqual (Operand0, Operand1) */
 599
 600                         if (integer0 == integer1) {
 601                                 local_result = TRUE;
 602                         }
 603                         break;
 604
 605                 case AML_LGREATER_OP:   /* LGreater (Operand0, Operand1) */
 606
 607                         if (integer0 > integer1) {
 608                                 local_result = TRUE;
 609                         }
 610                         break;
 611
 612                 case AML_LLESS_OP:      /* LLess (Operand0, Operand1) */
 613
 614                         if (integer0 < integer1) {
 615                                 local_result = TRUE;
 616                         }
 617                         break;
 618
 619                 default:
 620                         status = AE_AML_INTERNAL;
 621                         break;
 622                 }
 623         } else {
 624                 /*
 625                  * 2) Both operands are Strings or both are Buffers
 626                  *    Note: Code below takes advantage of common Buffer/String
 627                  *          object fields. local_operand1 may have changed above. Use
 628                  *          memcmp to handle nulls in buffers.
 629                  */
 630                 length0 = operand0->buffer.length;
 631                 length1 = local_operand1->buffer.length;
 632
 633                 /* Lexicographic compare: compare the data bytes */
 634
 635                 compare = ACPI_MEMCMP(operand0->buffer.pointer,
 636                                       local_operand1->buffer.pointer,
 637                                       (length0 > length1) ? length1 : length0);
 638
 639                 switch (opcode) {
 640                 case AML_LEQUAL_OP:     /* LEqual (Operand0, Operand1) */
 641
 642                         /* Length and all bytes must be equal */
 643
 644                         if ((length0 == length1) && (compare == 0)) {
 645                                 /* Length and all bytes match ==> TRUE */
 646
 647                                 local_result = TRUE;
 648                         }
 649                         break;
 650
 651                 case AML_LGREATER_OP:   /* LGreater (Operand0, Operand1) */
 652
 653                         if (compare > 0) {
 654                                 local_result = TRUE;
 655                                 goto cleanup;   /* TRUE */
 656                         }
 657                         if (compare < 0) {
 658                                 goto cleanup;   /* FALSE */
 659                         }
 660
 661                         /* Bytes match (to shortest length), compare lengths */
 662
 663                         if (length0 > length1) {
 664                                 local_result = TRUE;
 665                         }
 666                         break;
 667
 668                 case AML_LLESS_OP:      /* LLess (Operand0, Operand1) */
 669
 670                         if (compare > 0) {
 671                                 goto cleanup;   /* FALSE */
 672                         }
 673                         if (compare < 0) {
 674                                 local_result = TRUE;
 675                                 goto cleanup;   /* TRUE */
 676                         }
 677
 678                         /* Bytes match (to shortest length), compare lengths */
 679
 680                         if (length0 < length1) {
 681                                 local_result = TRUE;
 682                         }
 683                         break;
 684
 685                 default:
 686                         status = AE_AML_INTERNAL;
 687                         break;
 688                 }
 689         }
 690
 691       cleanup:
 692
 693         /* New object was created if implicit conversion performed - delete */
 694
 695         if (local_operand1 != operand1) {
 696                 acpi_ut_remove_reference(local_operand1);
 697         }
 698
 699         /* Return the logical result and status */
 700
 701         *logical_result = local_result;
 702         return_ACPI_STATUS(status);
 703 }