1
2 /******************************************************************************
3 *
4 * Module Name: exmisc - ACPI AML (p-code) execution - specific opcodes
5 *
6 *****************************************************************************/
7
8 /*
9 * Copyright (C) 2000 - 2011, Intel Corp.
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 #define __EXMISC_C__
46
47 #include "acpi.h"
48 #include "accommon.h"
49 #include "acinterp.h"
50 #include "amlcode.h"
51 #include "amlresrc.h"
52
53
54 #define _COMPONENT ACPI_EXECUTER
55 ACPI_MODULE_NAME ("exmisc")
56
57
58 /*******************************************************************************
59 *
60 * FUNCTION: AcpiExGetObjectReference
61 *
62 * PARAMETERS: ObjDesc - Create a reference to this object
63 * ReturnDesc - Where to store the reference
64 * WalkState - Current state
65 *
66 * RETURN: Status
67 *
68 * DESCRIPTION: Obtain and return a "reference" to the target object
69 * Common code for the RefOfOp and the CondRefOfOp.
70 *
71 ******************************************************************************/
72
73 ACPI_STATUS
74 AcpiExGetObjectReference (
75 ACPI_OPERAND_OBJECT *ObjDesc,
76 ACPI_OPERAND_OBJECT **ReturnDesc,
77 ACPI_WALK_STATE *WalkState)
78 {
79 ACPI_OPERAND_OBJECT *ReferenceObj;
80 ACPI_OPERAND_OBJECT *ReferencedObj;
81
82
83 ACPI_FUNCTION_TRACE_PTR (ExGetObjectReference, ObjDesc);
84
85
86 *ReturnDesc = NULL;
87
88 switch (ACPI_GET_DESCRIPTOR_TYPE (ObjDesc))
89 {
90 case ACPI_DESC_TYPE_OPERAND:
91
92 if (ObjDesc->Common.Type != ACPI_TYPE_LOCAL_REFERENCE)
93 {
94 return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
95 }
96
97 /*
98 * Must be a reference to a Local or Arg
99 */
100 switch (ObjDesc->Reference.Class)
101 {
102 case ACPI_REFCLASS_LOCAL:
103 case ACPI_REFCLASS_ARG:
104 case ACPI_REFCLASS_DEBUG:
105
106 /* The referenced object is the pseudo-node for the local/arg */
107
108 ReferencedObj = ObjDesc->Reference.Object;
109 break;
110
111 default:
112
113 ACPI_ERROR ((AE_INFO, "Unknown Reference Class 0x%2.2X",
114 ObjDesc->Reference.Class));
115 return_ACPI_STATUS (AE_AML_INTERNAL);
116 }
117 break;
118
119
120 case ACPI_DESC_TYPE_NAMED:
121
122 /*
123 * A named reference that has already been resolved to a Node
124 */
125 ReferencedObj = ObjDesc;
126 break;
127
128
129 default:
130
131 ACPI_ERROR ((AE_INFO, "Invalid descriptor type 0x%X",
132 ACPI_GET_DESCRIPTOR_TYPE (ObjDesc)));
133 return_ACPI_STATUS (AE_TYPE);
134 }
135
136
137 /* Create a new reference object */
138
139 ReferenceObj = AcpiUtCreateInternalObject (ACPI_TYPE_LOCAL_REFERENCE);
140 if (!ReferenceObj)
141 {
142 return_ACPI_STATUS (AE_NO_MEMORY);
143 }
144
145 ReferenceObj->Reference.Class = ACPI_REFCLASS_REFOF;
146 ReferenceObj->Reference.Object = ReferencedObj;
147 *ReturnDesc = ReferenceObj;
148
149 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
150 "Object %p Type [%s], returning Reference %p\n",
151 ObjDesc, AcpiUtGetObjectTypeName (ObjDesc), *ReturnDesc));
152
153 return_ACPI_STATUS (AE_OK);
154 }
155
156
157 /*******************************************************************************
158 *
159 * FUNCTION: AcpiExConcatTemplate
160 *
161 * PARAMETERS: Operand0 - First source object
162 * Operand1 - Second source object
163 * ActualReturnDesc - Where to place the return object
164 * WalkState - Current walk state
165 *
166 * RETURN: Status
167 *
168 * DESCRIPTION: Concatenate two resource templates
169 *
170 ******************************************************************************/
171
172 ACPI_STATUS
173 AcpiExConcatTemplate (
174 ACPI_OPERAND_OBJECT *Operand0,
175 ACPI_OPERAND_OBJECT *Operand1,
176 ACPI_OPERAND_OBJECT **ActualReturnDesc,
177 ACPI_WALK_STATE *WalkState)
178 {
179 ACPI_STATUS Status;
180 ACPI_OPERAND_OBJECT *ReturnDesc;
181 UINT8 *NewBuf;
182 UINT8 *EndTag;
183 ACPI_SIZE Length0;
184 ACPI_SIZE Length1;
185 ACPI_SIZE NewLength;
186
187
188 ACPI_FUNCTION_TRACE (ExConcatTemplate);
189
190
191 /*
192 * Find the EndTag descriptor in each resource template.
193 * Note1: returned pointers point TO the EndTag, not past it.
194 * Note2: zero-length buffers are allowed; treated like one EndTag
195 */
196
197 /* Get the length of the first resource template */
198
199 Status = AcpiUtGetResourceEndTag (Operand0, &EndTag);
200 if (ACPI_FAILURE (Status))
201 {
202 return_ACPI_STATUS (Status);
203 }
204
205 Length0 = ACPI_PTR_DIFF (EndTag, Operand0->Buffer.Pointer);
206
207 /* Get the length of the second resource template */
208
209 Status = AcpiUtGetResourceEndTag (Operand1, &EndTag);
210 if (ACPI_FAILURE (Status))
211 {
212 return_ACPI_STATUS (Status);
213 }
214
215 Length1 = ACPI_PTR_DIFF (EndTag, Operand1->Buffer.Pointer);
216
217 /* Combine both lengths, minimum size will be 2 for EndTag */
218
219 NewLength = Length0 + Length1 + sizeof (AML_RESOURCE_END_TAG);
220
221 /* Create a new buffer object for the result (with one EndTag) */
222
223 ReturnDesc = AcpiUtCreateBufferObject (NewLength);
224 if (!ReturnDesc)
225 {
226 return_ACPI_STATUS (AE_NO_MEMORY);
227 }
228
229 /*
230 * Copy the templates to the new buffer, 0 first, then 1 follows. One
231 * EndTag descriptor is copied from Operand1.
232 */
233 NewBuf = ReturnDesc->Buffer.Pointer;
234 ACPI_MEMCPY (NewBuf, Operand0->Buffer.Pointer, Length0);
235 ACPI_MEMCPY (NewBuf + Length0, Operand1->Buffer.Pointer, Length1);
236
237 /* Insert EndTag and set the checksum to zero, means "ignore checksum" */
238
239 NewBuf[NewLength - 1] = 0;
240 NewBuf[NewLength - 2] = ACPI_RESOURCE_NAME_END_TAG | 1;
241
242 /* Return the completed resource template */
243
244 *ActualReturnDesc = ReturnDesc;
245 return_ACPI_STATUS (AE_OK);
246 }
247
248
249 /*******************************************************************************
250 *
251 * FUNCTION: AcpiExDoConcatenate
252 *
253 * PARAMETERS: Operand0 - First source object
254 * Operand1 - Second source object
255 * ActualReturnDesc - Where to place the return object
256 * WalkState - Current walk state
257 *
258 * RETURN: Status
259 *
260 * DESCRIPTION: Concatenate two objects OF THE SAME TYPE.
261 *
262 ******************************************************************************/
263
264 ACPI_STATUS
265 AcpiExDoConcatenate (
266 ACPI_OPERAND_OBJECT *Operand0,
267 ACPI_OPERAND_OBJECT *Operand1,
268 ACPI_OPERAND_OBJECT **ActualReturnDesc,
269 ACPI_WALK_STATE *WalkState)
270 {
271 ACPI_OPERAND_OBJECT *LocalOperand1 = Operand1;
272 ACPI_OPERAND_OBJECT *ReturnDesc;
273 char *NewBuf;
274 ACPI_STATUS Status;
275
276
277 ACPI_FUNCTION_TRACE (ExDoConcatenate);
278
279
280 /*
281 * Convert the second operand if necessary. The first operand
282 * determines the type of the second operand, (See the Data Types
283 * section of the ACPI specification.) Both object types are
284 * guaranteed to be either Integer/String/Buffer by the operand
285 * resolution mechanism.
286 */
287 switch (Operand0->Common.Type)
288 {
289 case ACPI_TYPE_INTEGER:
290 Status = AcpiExConvertToInteger (Operand1, &LocalOperand1, 16);
291 break;
292
293 case ACPI_TYPE_STRING:
294 Status = AcpiExConvertToString (Operand1, &LocalOperand1,
295 ACPI_IMPLICIT_CONVERT_HEX);
296 break;
297
298 case ACPI_TYPE_BUFFER:
299 Status = AcpiExConvertToBuffer (Operand1, &LocalOperand1);
300 break;
301
302 default:
303 ACPI_ERROR ((AE_INFO, "Invalid object type: 0x%X",
304 Operand0->Common.Type));
305 Status = AE_AML_INTERNAL;
306 }
307
308 if (ACPI_FAILURE (Status))
309 {
310 goto Cleanup;
311 }
312
313 /*
314 * Both operands are now known to be the same object type
315 * (Both are Integer, String, or Buffer), and we can now perform the
316 * concatenation.
317 */
318
319 /*
320 * There are three cases to handle:
321 *
322 * 1) Two Integers concatenated to produce a new Buffer
323 * 2) Two Strings concatenated to produce a new String
324 * 3) Two Buffers concatenated to produce a new Buffer
325 */
326 switch (Operand0->Common.Type)
327 {
328 case ACPI_TYPE_INTEGER:
329
330 /* Result of two Integers is a Buffer */
331 /* Need enough buffer space for two integers */
332
333 ReturnDesc = AcpiUtCreateBufferObject ((ACPI_SIZE)
334 ACPI_MUL_2 (AcpiGbl_IntegerByteWidth));
335 if (!ReturnDesc)
336 {
337 Status = AE_NO_MEMORY;
338 goto Cleanup;
339 }
340
341 NewBuf = (char *) ReturnDesc->Buffer.Pointer;
342
343 /* Copy the first integer, LSB first */
344
345 ACPI_MEMCPY (NewBuf, &Operand0->Integer.Value,
346 AcpiGbl_IntegerByteWidth);
347
348 /* Copy the second integer (LSB first) after the first */
349
350 ACPI_MEMCPY (NewBuf + AcpiGbl_IntegerByteWidth,
351 &LocalOperand1->Integer.Value,
352 AcpiGbl_IntegerByteWidth);
353 break;
354
355 case ACPI_TYPE_STRING:
356
357 /* Result of two Strings is a String */
358
359 ReturnDesc = AcpiUtCreateStringObject (
360 ((ACPI_SIZE) Operand0->String.Length +
361 LocalOperand1->String.Length));
362 if (!ReturnDesc)
363 {
364 Status = AE_NO_MEMORY;
365 goto Cleanup;
366 }
367
368 NewBuf = ReturnDesc->String.Pointer;
369
370 /* Concatenate the strings */
371
372 ACPI_STRCPY (NewBuf, Operand0->String.Pointer);
373 ACPI_STRCPY (NewBuf + Operand0->String.Length,
374 LocalOperand1->String.Pointer);
375 break;
376
377 case ACPI_TYPE_BUFFER:
378
379 /* Result of two Buffers is a Buffer */
380
381 ReturnDesc = AcpiUtCreateBufferObject (
382 ((ACPI_SIZE) Operand0->Buffer.Length +
383 LocalOperand1->Buffer.Length));
384 if (!ReturnDesc)
385 {
386 Status = AE_NO_MEMORY;
387 goto Cleanup;
388 }
389
390 NewBuf = (char *) ReturnDesc->Buffer.Pointer;
391
392 /* Concatenate the buffers */
393
394 ACPI_MEMCPY (NewBuf, Operand0->Buffer.Pointer,
395 Operand0->Buffer.Length);
396 ACPI_MEMCPY (NewBuf + Operand0->Buffer.Length,
397 LocalOperand1->Buffer.Pointer,
398 LocalOperand1->Buffer.Length);
399 break;
400
401 default:
402
403 /* Invalid object type, should not happen here */
404
405 ACPI_ERROR ((AE_INFO, "Invalid object type: 0x%X",
406 Operand0->Common.Type));
407 Status =AE_AML_INTERNAL;
408 goto Cleanup;
409 }
410
411 *ActualReturnDesc = ReturnDesc;
412
413 Cleanup:
414 if (LocalOperand1 != Operand1)
415 {
416 AcpiUtRemoveReference (LocalOperand1);
417 }
418 return_ACPI_STATUS (Status);
419 }
420
421
422 /*******************************************************************************
423 *
424 * FUNCTION: AcpiExDoMathOp
425 *
426 * PARAMETERS: Opcode - AML opcode
427 * Integer0 - Integer operand #0
428 * Integer1 - Integer operand #1
429 *
430 * RETURN: Integer result of the operation
431 *
432 * DESCRIPTION: Execute a math AML opcode. The purpose of having all of the
433 * math functions here is to prevent a lot of pointer dereferencing
434 * to obtain the operands.
435 *
436 ******************************************************************************/
437
438 UINT64
439 AcpiExDoMathOp (
440 UINT16 Opcode,
441 UINT64 Integer0,
442 UINT64 Integer1)
443 {
444
445 ACPI_FUNCTION_ENTRY ();
446
447
448 switch (Opcode)
449 {
450 case AML_ADD_OP: /* Add (Integer0, Integer1, Result) */
451
452 return (Integer0 + Integer1);
453
454
455 case AML_BIT_AND_OP: /* And (Integer0, Integer1, Result) */
456
457 return (Integer0 & Integer1);
458
459
460 case AML_BIT_NAND_OP: /* NAnd (Integer0, Integer1, Result) */
461
462 return (~(Integer0 & Integer1));
463
464
465 case AML_BIT_OR_OP: /* Or (Integer0, Integer1, Result) */
466
467 return (Integer0 | Integer1);
468
469
470 case AML_BIT_NOR_OP: /* NOr (Integer0, Integer1, Result) */
471
472 return (~(Integer0 | Integer1));
473
474
475 case AML_BIT_XOR_OP: /* XOr (Integer0, Integer1, Result) */
476
477 return (Integer0 ^ Integer1);
478
479
480 case AML_MULTIPLY_OP: /* Multiply (Integer0, Integer1, Result) */
481
482 return (Integer0 * Integer1);
483
484
485 case AML_SHIFT_LEFT_OP: /* ShiftLeft (Operand, ShiftCount, Result)*/
486
487 /*
488 * We need to check if the shiftcount is larger than the integer bit
489 * width since the behavior of this is not well-defined in the C language.
490 */
491 if (Integer1 >= AcpiGbl_IntegerBitWidth)
492 {
493 return (0);
494 }
495 return (Integer0 << Integer1);
496
497
498 case AML_SHIFT_RIGHT_OP: /* ShiftRight (Operand, ShiftCount, Result) */
499
500 /*
501 * We need to check if the shiftcount is larger than the integer bit
502 * width since the behavior of this is not well-defined in the C language.
503 */
504 if (Integer1 >= AcpiGbl_IntegerBitWidth)
505 {
506 return (0);
507 }
508 return (Integer0 >> Integer1);
509
510
511 case AML_SUBTRACT_OP: /* Subtract (Integer0, Integer1, Result) */
512
513 return (Integer0 - Integer1);
514
515 default:
516
517 return (0);
518 }
519 }
520
521
522 /*******************************************************************************
523 *
524 * FUNCTION: AcpiExDoLogicalNumericOp
525 *
526 * PARAMETERS: Opcode - AML opcode
527 * Integer0 - Integer operand #0
528 * Integer1 - Integer operand #1
529 * LogicalResult - TRUE/FALSE result of the operation
530 *
531 * RETURN: Status
532 *
533 * DESCRIPTION: Execute a logical "Numeric" AML opcode. For these Numeric
534 * operators (LAnd and LOr), both operands must be integers.
535 *
536 * Note: cleanest machine code seems to be produced by the code
537 * below, rather than using statements of the form:
538 * Result = (Integer0 && Integer1);
539 *
540 ******************************************************************************/
541
542 ACPI_STATUS
543 AcpiExDoLogicalNumericOp (
544 UINT16 Opcode,
545 UINT64 Integer0,
546 UINT64 Integer1,
547 BOOLEAN *LogicalResult)
548 {
549 ACPI_STATUS Status = AE_OK;
550 BOOLEAN LocalResult = FALSE;
551
552
553 ACPI_FUNCTION_TRACE (ExDoLogicalNumericOp);
554
555
556 switch (Opcode)
557 {
558 case AML_LAND_OP: /* LAnd (Integer0, Integer1) */
559
560 if (Integer0 && Integer1)
561 {
562 LocalResult = TRUE;
563 }
564 break;
565
566 case AML_LOR_OP: /* LOr (Integer0, Integer1) */
567
568 if (Integer0 || Integer1)
569 {
570 LocalResult = TRUE;
571 }
572 break;
573
574 default:
575 Status = AE_AML_INTERNAL;
576 break;
577 }
578
579 /* Return the logical result and status */
580
581 *LogicalResult = LocalResult;
582 return_ACPI_STATUS (Status);
583 }
584
585
586 /*******************************************************************************
587 *
588 * FUNCTION: AcpiExDoLogicalOp
589 *
590 * PARAMETERS: Opcode - AML opcode
591 * Operand0 - operand #0
592 * Operand1 - operand #1
593 * LogicalResult - TRUE/FALSE result of the operation
594 *
595 * RETURN: Status
596 *
597 * DESCRIPTION: Execute a logical AML opcode. The purpose of having all of the
598 * functions here is to prevent a lot of pointer dereferencing
599 * to obtain the operands and to simplify the generation of the
600 * logical value. For the Numeric operators (LAnd and LOr), both
601 * operands must be integers. For the other logical operators,
602 * operands can be any combination of Integer/String/Buffer. The
603 * first operand determines the type to which the second operand
604 * will be converted.
605 *
606 * Note: cleanest machine code seems to be produced by the code
607 * below, rather than using statements of the form:
608 * Result = (Operand0 == Operand1);
609 *
610 ******************************************************************************/
611
612 ACPI_STATUS
613 AcpiExDoLogicalOp (
614 UINT16 Opcode,
615 ACPI_OPERAND_OBJECT *Operand0,
616 ACPI_OPERAND_OBJECT *Operand1,
617 BOOLEAN *LogicalResult)
618 {
619 ACPI_OPERAND_OBJECT *LocalOperand1 = Operand1;
620 UINT64 Integer0;
621 UINT64 Integer1;
622 UINT32 Length0;
623 UINT32 Length1;
624 ACPI_STATUS Status = AE_OK;
625 BOOLEAN LocalResult = FALSE;
626 int Compare;
627
628
629 ACPI_FUNCTION_TRACE (ExDoLogicalOp);
630
631
632 /*
633 * Convert the second operand if necessary. The first operand
634 * determines the type of the second operand, (See the Data Types
635 * section of the ACPI 3.0+ specification.) Both object types are
636 * guaranteed to be either Integer/String/Buffer by the operand
637 * resolution mechanism.
638 */
639 switch (Operand0->Common.Type)
640 {
641 case ACPI_TYPE_INTEGER:
642 Status = AcpiExConvertToInteger (Operand1, &LocalOperand1, 16);
643 break;
644
645 case ACPI_TYPE_STRING:
646 Status = AcpiExConvertToString (Operand1, &LocalOperand1,
647 ACPI_IMPLICIT_CONVERT_HEX);
648 break;
649
650 case ACPI_TYPE_BUFFER:
651 Status = AcpiExConvertToBuffer (Operand1, &LocalOperand1);
652 break;
653
654 default:
655 Status = AE_AML_INTERNAL;
656 break;
657 }
658
659 if (ACPI_FAILURE (Status))
660 {
661 goto Cleanup;
662 }
663
664 /*
665 * Two cases: 1) Both Integers, 2) Both Strings or Buffers
666 */
667 if (Operand0->Common.Type == ACPI_TYPE_INTEGER)
668 {
669 /*
670 * 1) Both operands are of type integer
671 * Note: LocalOperand1 may have changed above
672 */
673 Integer0 = Operand0->Integer.Value;
674 Integer1 = LocalOperand1->Integer.Value;
675
676 switch (Opcode)
677 {
678 case AML_LEQUAL_OP: /* LEqual (Operand0, Operand1) */
679
680 if (Integer0 == Integer1)
681 {
682 LocalResult = TRUE;
683 }
684 break;
685
686 case AML_LGREATER_OP: /* LGreater (Operand0, Operand1) */
687
688 if (Integer0 > Integer1)
689 {
690 LocalResult = TRUE;
691 }
692 break;
693
694 case AML_LLESS_OP: /* LLess (Operand0, Operand1) */
695
696 if (Integer0 < Integer1)
697 {
698 LocalResult = TRUE;
699 }
700 break;
701
702 default:
703 Status = AE_AML_INTERNAL;
704 break;
705 }
706 }
707 else
708 {
709 /*
710 * 2) Both operands are Strings or both are Buffers
711 * Note: Code below takes advantage of common Buffer/String
712 * object fields. LocalOperand1 may have changed above. Use
713 * memcmp to handle nulls in buffers.
714 */
715 Length0 = Operand0->Buffer.Length;
716 Length1 = LocalOperand1->Buffer.Length;
717
718 /* Lexicographic compare: compare the data bytes */
719
720 Compare = ACPI_MEMCMP (Operand0->Buffer.Pointer,
721 LocalOperand1->Buffer.Pointer,
722 (Length0 > Length1) ? Length1 : Length0);
723
724 switch (Opcode)
725 {
726 case AML_LEQUAL_OP: /* LEqual (Operand0, Operand1) */
727
728 /* Length and all bytes must be equal */
729
730 if ((Length0 == Length1) &&
731 (Compare == 0))
732 {
733 /* Length and all bytes match ==> TRUE */
734
735 LocalResult = TRUE;
736 }
737 break;
738
739 case AML_LGREATER_OP: /* LGreater (Operand0, Operand1) */
740
741 if (Compare > 0)
742 {
743 LocalResult = TRUE;
744 goto Cleanup; /* TRUE */
745 }
746 if (Compare < 0)
747 {
748 goto Cleanup; /* FALSE */
749 }
750
751 /* Bytes match (to shortest length), compare lengths */
752
753 if (Length0 > Length1)
754 {
755 LocalResult = TRUE;
756 }
757 break;
758
759 case AML_LLESS_OP: /* LLess (Operand0, Operand1) */
760
761 if (Compare > 0)
762 {
763 goto Cleanup; /* FALSE */
764 }
765 if (Compare < 0)
766 {
767 LocalResult = TRUE;
768 goto Cleanup; /* TRUE */
769 }
770
771 /* Bytes match (to shortest length), compare lengths */
772
773 if (Length0 < Length1)
774 {
775 LocalResult = TRUE;
776 }
777 break;
778
779 default:
780 Status = AE_AML_INTERNAL;
781 break;
782 }
783 }
784
785 Cleanup:
786
787 /* New object was created if implicit conversion performed - delete */
788
789 if (LocalOperand1 != Operand1)
790 {
791 AcpiUtRemoveReference (LocalOperand1);
792 }
793
794 /* Return the logical result and status */
795
796 *LogicalResult = LocalResult;
797 return_ACPI_STATUS (Status);
798 }
799
800