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
46 #include <acpi/acpi.h>
47 #include <acpi/acinterp.h>
48 #include <acpi/amlcode.h>
49
50
51 #define _COMPONENT ACPI_EXECUTER
52 ACPI_MODULE_NAME ("exmisc")
53
54
55 /*******************************************************************************
56 *
57 * FUNCTION: acpi_ex_get_object_reference
58 *
59 * PARAMETERS: obj_desc - Create a reference to this object
60 * return_desc - Where to store the reference
61 * walk_state - Current state
62 *
63 * RETURN: Status
64 *
65 * DESCRIPTION: Obtain and return a "reference" to the target object
66 * Common code for the ref_of_op and the cond_ref_of_op.
67 *
68 ******************************************************************************/
69
70 acpi_status
71 acpi_ex_get_object_reference (
72 union acpi_operand_object *obj_desc,
73 union acpi_operand_object **return_desc,
74 struct acpi_walk_state *walk_state)
75 {
76 union acpi_operand_object *reference_obj;
77 union acpi_operand_object *referenced_obj;
78
79
80 ACPI_FUNCTION_TRACE_PTR ("ex_get_object_reference", obj_desc);
81
82
83 *return_desc = NULL;
84
85 switch (ACPI_GET_DESCRIPTOR_TYPE (obj_desc)) {
86 case ACPI_DESC_TYPE_OPERAND:
87
88 if (ACPI_GET_OBJECT_TYPE (obj_desc) != ACPI_TYPE_LOCAL_REFERENCE) {
89 return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
90 }
91
92 /*
93 * Must be a reference to a Local or Arg
94 */
95 switch (obj_desc->reference.opcode) {
96 case AML_LOCAL_OP:
97 case AML_ARG_OP:
98
99 /* The referenced object is the pseudo-node for the local/arg */
100
101 referenced_obj = obj_desc->reference.object;
102 break;
103
104 default:
105
106 ACPI_REPORT_ERROR (("Unknown Reference subtype in get ref %X\n",
107 obj_desc->reference.opcode));
108 return_ACPI_STATUS (AE_AML_INTERNAL);
109 }
110 break;
111
112
113 case ACPI_DESC_TYPE_NAMED:
114
115 /*
116 * A named reference that has already been resolved to a Node
117 */
118 referenced_obj = obj_desc;
119 break;
120
121
122 default:
123
124 ACPI_REPORT_ERROR (("Invalid descriptor type in get ref: %X\n",
125 ACPI_GET_DESCRIPTOR_TYPE (obj_desc)));
126 return_ACPI_STATUS (AE_TYPE);
127 }
128
129
130 /* Create a new reference object */
131
132 reference_obj = acpi_ut_create_internal_object (ACPI_TYPE_LOCAL_REFERENCE);
133 if (!reference_obj) {
134 return_ACPI_STATUS (AE_NO_MEMORY);
135 }
136
137 reference_obj->reference.opcode = AML_REF_OF_OP;
138 reference_obj->reference.object = referenced_obj;
139 *return_desc = reference_obj;
140
141 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Object %p Type [%s], returning Reference %p\n",
142 obj_desc, acpi_ut_get_object_type_name (obj_desc), *return_desc));
143
144 return_ACPI_STATUS (AE_OK);
145 }
146
147
148 /*******************************************************************************
149 *
150 * FUNCTION: acpi_ex_concat_template
151 *
152 * PARAMETERS: Operand0 - First source object
153 * Operand1 - Second source object
154 * actual_return_desc - Where to place the return object
155 * walk_state - Current walk state
156 *
157 * RETURN: Status
158 *
159 * DESCRIPTION: Concatenate two resource templates
160 *
161 ******************************************************************************/
162
163 acpi_status
164 acpi_ex_concat_template (
165 union acpi_operand_object *operand0,
166 union acpi_operand_object *operand1,
167 union acpi_operand_object **actual_return_desc,
168 struct acpi_walk_state *walk_state)
169 {
170 union acpi_operand_object *return_desc;
171 u8 *new_buf;
172 u8 *end_tag1;
173 u8 *end_tag2;
174 acpi_size length1;
175 acpi_size length2;
176
177
178 ACPI_FUNCTION_TRACE ("ex_concat_template");
179
180
181 /* Find the end_tags in each resource template */
182
183 end_tag1 = acpi_ut_get_resource_end_tag (operand0);
184 end_tag2 = acpi_ut_get_resource_end_tag (operand1);
185 if (!end_tag1 || !end_tag2) {
186 return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
187 }
188
189 /* Compute the length of each part */
190
191 length1 = ACPI_PTR_DIFF (end_tag1, operand0->buffer.pointer);
192 length2 = ACPI_PTR_DIFF (end_tag2, operand1->buffer.pointer) +
193 2; /* Size of END_TAG */
194
195 /* Create a new buffer object for the result */
196
197 return_desc = acpi_ut_create_buffer_object (length1 + length2);
198 if (!return_desc) {
199 return_ACPI_STATUS (AE_NO_MEMORY);
200 }
201
202 /* Copy the templates to the new descriptor */
203
204 new_buf = return_desc->buffer.pointer;
205 ACPI_MEMCPY (new_buf, operand0->buffer.pointer, length1);
206 ACPI_MEMCPY (new_buf + length1, operand1->buffer.pointer, length2);
207
208 /* Compute the new checksum */
209
210 new_buf[return_desc->buffer.length - 1] =
211 acpi_ut_generate_checksum (return_desc->buffer.pointer,
212 (return_desc->buffer.length - 1));
213
214 /* Return the completed template descriptor */
215
216 *actual_return_desc = return_desc;
217 return_ACPI_STATUS (AE_OK);
218 }
219
220
221 /*******************************************************************************
222 *
223 * FUNCTION: acpi_ex_do_concatenate
224 *
225 * PARAMETERS: Operand0 - First source object
226 * Operand1 - Second source object
227 * actual_return_desc - Where to place the return object
228 * walk_state - Current walk state
229 *
230 * RETURN: Status
231 *
232 * DESCRIPTION: Concatenate two objects OF THE SAME TYPE.
233 *
234 ******************************************************************************/
235
236 acpi_status
237 acpi_ex_do_concatenate (
238 union acpi_operand_object *operand0,
239 union acpi_operand_object *operand1,
240 union acpi_operand_object **actual_return_desc,
241 struct acpi_walk_state *walk_state)
242 {
243 union acpi_operand_object *local_operand1 = operand1;
244 union acpi_operand_object *return_desc;
245 char *new_buf;
246 acpi_status status;
247 acpi_size new_length;
248
249
250 ACPI_FUNCTION_TRACE ("ex_do_concatenate");
251
252
253 /*
254 * Convert the second operand if necessary. The first operand
255 * determines the type of the second operand, (See the Data Types
256 * section of the ACPI specification.) Both object types are
257 * guaranteed to be either Integer/String/Buffer by the operand
258 * resolution mechanism.
259 */
260 switch (ACPI_GET_OBJECT_TYPE (operand0)) {
261 case ACPI_TYPE_INTEGER:
262 status = acpi_ex_convert_to_integer (operand1, &local_operand1, 16);
263 break;
264
265 case ACPI_TYPE_STRING:
266 status = acpi_ex_convert_to_string (operand1, &local_operand1,
267 ACPI_IMPLICIT_CONVERT_HEX);
268 break;
269
270 case ACPI_TYPE_BUFFER:
271 status = acpi_ex_convert_to_buffer (operand1, &local_operand1);
272 break;
273
274 default:
275 ACPI_REPORT_ERROR (("Concat - invalid obj type: %X\n",
276 ACPI_GET_OBJECT_TYPE (operand0)));
277 status = AE_AML_INTERNAL;
278 }
279
280 if (ACPI_FAILURE (status)) {
281 goto cleanup;
282 }
283
284 /*
285 * Both operands are now known to be the same object type
286 * (Both are Integer, String, or Buffer), and we can now perform the
287 * concatenation.
288 */
289
290 /*
291 * There are three cases to handle:
292 *
293 * 1) Two Integers concatenated to produce a new Buffer
294 * 2) Two Strings concatenated to produce a new String
295 * 3) Two Buffers concatenated to produce a new Buffer
296 */
297 switch (ACPI_GET_OBJECT_TYPE (operand0)) {
298 case ACPI_TYPE_INTEGER:
299
300 /* Result of two Integers is a Buffer */
301 /* Need enough buffer space for two integers */
302
303 return_desc = acpi_ut_create_buffer_object (
304 ACPI_MUL_2 (acpi_gbl_integer_byte_width));
305 if (!return_desc) {
306 status = AE_NO_MEMORY;
307 goto cleanup;
308 }
309
310 new_buf = (char *) return_desc->buffer.pointer;
311
312 /* Copy the first integer, LSB first */
313
314 ACPI_MEMCPY (new_buf,
315 &operand0->integer.value,
316 acpi_gbl_integer_byte_width);
317
318 /* Copy the second integer (LSB first) after the first */
319
320 ACPI_MEMCPY (new_buf + acpi_gbl_integer_byte_width,
321 &local_operand1->integer.value,
322 acpi_gbl_integer_byte_width);
323 break;
324
325 case ACPI_TYPE_STRING:
326
327 /* Result of two Strings is a String */
328
329 new_length = (acpi_size) operand0->string.length +
330 (acpi_size) local_operand1->string.length;
331 if (new_length > ACPI_MAX_STRING_CONVERSION) {
332 status = AE_AML_STRING_LIMIT;
333 goto cleanup;
334 }
335
336 return_desc = acpi_ut_create_string_object (new_length);
337 if (!return_desc) {
338 status = AE_NO_MEMORY;
339 goto cleanup;
340 }
341
342 new_buf = return_desc->string.pointer;
343
344 /* Concatenate the strings */
345
346 ACPI_STRCPY (new_buf,
347 operand0->string.pointer);
348 ACPI_STRCPY (new_buf + operand0->string.length,
349 local_operand1->string.pointer);
350 break;
351
352 case ACPI_TYPE_BUFFER:
353
354 /* Result of two Buffers is a Buffer */
355
356 return_desc = acpi_ut_create_buffer_object (
357 (acpi_size) operand0->buffer.length +
358 (acpi_size) local_operand1->buffer.length);
359 if (!return_desc) {
360 status = AE_NO_MEMORY;
361 goto cleanup;
362 }
363
364 new_buf = (char *) return_desc->buffer.pointer;
365
366 /* Concatenate the buffers */
367
368 ACPI_MEMCPY (new_buf,
369 operand0->buffer.pointer,
370 operand0->buffer.length);
371 ACPI_MEMCPY (new_buf + operand0->buffer.length,
372 local_operand1->buffer.pointer,
373 local_operand1->buffer.length);
374 break;
375
376 default:
377
378 /* Invalid object type, should not happen here */
379
380 ACPI_REPORT_ERROR (("Concatenate - Invalid object type: %X\n",
381 ACPI_GET_OBJECT_TYPE (operand0)));
382 status =AE_AML_INTERNAL;
383 goto cleanup;
384 }
385
386 *actual_return_desc = return_desc;
387
388 cleanup:
389 if (local_operand1 != operand1) {
390 acpi_ut_remove_reference (local_operand1);
391 }
392 return_ACPI_STATUS (status);
393 }
394
395
396 /*******************************************************************************
397 *
398 * FUNCTION: acpi_ex_do_math_op
399 *
400 * PARAMETERS: Opcode - AML opcode
401 * Integer0 - Integer operand #0
402 * Integer1 - Integer operand #1
403 *
404 * RETURN: Integer result of the operation
405 *
406 * DESCRIPTION: Execute a math AML opcode. The purpose of having all of the
407 * math functions here is to prevent a lot of pointer dereferencing
408 * to obtain the operands.
409 *
410 ******************************************************************************/
411
412 acpi_integer
413 acpi_ex_do_math_op (
414 u16 opcode,
415 acpi_integer integer0,
416 acpi_integer integer1)
417 {
418
419 ACPI_FUNCTION_ENTRY ();
420
421
422 switch (opcode) {
423 case AML_ADD_OP: /* Add (Integer0, Integer1, Result) */
424
425 return (integer0 + integer1);
426
427
428 case AML_BIT_AND_OP: /* And (Integer0, Integer1, Result) */
429
430 return (integer0 & integer1);
431
432
433 case AML_BIT_NAND_OP: /* NAnd (Integer0, Integer1, Result) */
434
435 return (~(integer0 & integer1));
436
437
438 case AML_BIT_OR_OP: /* Or (Integer0, Integer1, Result) */
439
440 return (integer0 | integer1);
441
442
443 case AML_BIT_NOR_OP: /* NOr (Integer0, Integer1, Result) */
444
445 return (~(integer0 | integer1));
446
447
448 case AML_BIT_XOR_OP: /* XOr (Integer0, Integer1, Result) */
449
450 return (integer0 ^ integer1);
451
452
453 case AML_MULTIPLY_OP: /* Multiply (Integer0, Integer1, Result) */
454
455 return (integer0 * integer1);
456
457
458 case AML_SHIFT_LEFT_OP: /* shift_left (Operand, shift_count, Result) */
459
460 return (integer0 << integer1);
461
462
463 case AML_SHIFT_RIGHT_OP: /* shift_right (Operand, shift_count, Result) */
464
465 return (integer0 >> integer1);
466
467
468 case AML_SUBTRACT_OP: /* Subtract (Integer0, Integer1, Result) */
469
470 return (integer0 - integer1);
471
472 default:
473
474 return (0);
475 }
476 }
477
478
479 /*******************************************************************************
480 *
481 * FUNCTION: acpi_ex_do_logical_numeric_op
482 *
483 * PARAMETERS: Opcode - AML opcode
484 * Integer0 - Integer operand #0
485 * Integer1 - Integer operand #1
486 * logical_result - TRUE/FALSE result of the operation
487 *
488 * RETURN: Status
489 *
490 * DESCRIPTION: Execute a logical "Numeric" AML opcode. For these Numeric
491 * operators (LAnd and LOr), both operands must be integers.
492 *
493 * Note: cleanest machine code seems to be produced by the code
494 * below, rather than using statements of the form:
495 * Result = (Integer0 && Integer1);
496 *
497 ******************************************************************************/
498
499 acpi_status
500 acpi_ex_do_logical_numeric_op (
501 u16 opcode,
502 acpi_integer integer0,
503 acpi_integer integer1,
504 u8 *logical_result)
505 {
506 acpi_status status = AE_OK;
507 u8 local_result = FALSE;
508
509
510 ACPI_FUNCTION_TRACE ("ex_do_logical_numeric_op");
511
512
513 switch (opcode) {
514 case AML_LAND_OP: /* LAnd (Integer0, Integer1) */
515
516 if (integer0 && integer1) {
517 local_result = TRUE;
518 }
519 break;
520
521 case AML_LOR_OP: /* LOr (Integer0, Integer1) */
522
523 if (integer0 || integer1) {
524 local_result = TRUE;
525 }
526 break;
527
528 default:
529 status = AE_AML_INTERNAL;
530 break;
531 }
532
533 /* Return the logical result and status */
534
535 *logical_result = local_result;
536 return_ACPI_STATUS (status);
537 }
538
539
540 /*******************************************************************************
541 *
542 * FUNCTION: acpi_ex_do_logical_op
543 *
544 * PARAMETERS: Opcode - AML opcode
545 * Operand0 - operand #0
546 * Operand1 - operand #1
547 * logical_result - TRUE/FALSE result of the operation
548 *
549 * RETURN: Status
550 *
551 * DESCRIPTION: Execute a logical AML opcode. The purpose of having all of the
552 * functions here is to prevent a lot of pointer dereferencing
553 * to obtain the operands and to simplify the generation of the
554 * logical value. For the Numeric operators (LAnd and LOr), both
555 * operands must be integers. For the other logical operators,
556 * operands can be any combination of Integer/String/Buffer. The
557 * first operand determines the type to which the second operand
558 * will be converted.
559 *
560 * Note: cleanest machine code seems to be produced by the code
561 * below, rather than using statements of the form:
562 * Result = (Operand0 == Operand1);
563 *
564 ******************************************************************************/
565
566 acpi_status
567 acpi_ex_do_logical_op (
568 u16 opcode,
569 union acpi_operand_object *operand0,
570 union acpi_operand_object *operand1,
571 u8 *logical_result)
572 {
573 union acpi_operand_object *local_operand1 = operand1;
574 acpi_integer integer0;
575 acpi_integer integer1;
576 u32 length0;
577 u32 length1;
578 acpi_status status = AE_OK;
579 u8 local_result = FALSE;
580 int compare;
581
582
583 ACPI_FUNCTION_TRACE ("ex_do_logical_op");
584
585
586 /*
587 * Convert the second operand if necessary. The first operand
588 * determines the type of the second operand, (See the Data Types
589 * section of the ACPI 3.0+ specification.) Both object types are
590 * guaranteed to be either Integer/String/Buffer by the operand
591 * resolution mechanism.
592 */
593 switch (ACPI_GET_OBJECT_TYPE (operand0)) {
594 case ACPI_TYPE_INTEGER:
595 status = acpi_ex_convert_to_integer (operand1, &local_operand1, 16);
596 break;
597
598 case ACPI_TYPE_STRING:
599 status = acpi_ex_convert_to_string (operand1, &local_operand1,
600 ACPI_IMPLICIT_CONVERT_HEX);
601 break;
602
603 case ACPI_TYPE_BUFFER:
604 status = acpi_ex_convert_to_buffer (operand1, &local_operand1);
605 break;
606
607 default:
608 status = AE_AML_INTERNAL;
609 break;
610 }
611
612 if (ACPI_FAILURE (status)) {
613 goto cleanup;
614 }
615
616 /*
617 * Two cases: 1) Both Integers, 2) Both Strings or Buffers
618 */
619 if (ACPI_GET_OBJECT_TYPE (operand0) == ACPI_TYPE_INTEGER) {
620 /*
621 * 1) Both operands are of type integer
622 * Note: local_operand1 may have changed above
623 */
624 integer0 = operand0->integer.value;
625 integer1 = local_operand1->integer.value;
626
627 switch (opcode) {
628 case AML_LEQUAL_OP: /* LEqual (Operand0, Operand1) */
629
630 if (integer0 == integer1) {
631 local_result = TRUE;
632 }
633 break;
634
635 case AML_LGREATER_OP: /* LGreater (Operand0, Operand1) */
636
637 if (integer0 > integer1) {
638 local_result = TRUE;
639 }
640 break;
641
642 case AML_LLESS_OP: /* LLess (Operand0, Operand1) */
643
644 if (integer0 < integer1) {
645 local_result = TRUE;
646 }
647 break;
648
649 default:
650 status = AE_AML_INTERNAL;
651 break;
652 }
653 }
654 else {
655 /*
656 * 2) Both operands are Strings or both are Buffers
657 * Note: Code below takes advantage of common Buffer/String
658 * object fields. local_operand1 may have changed above. Use
659 * memcmp to handle nulls in buffers.
660 */
661 length0 = operand0->buffer.length;
662 length1 = local_operand1->buffer.length;
663
664 /* Lexicographic compare: compare the data bytes */
665
666 compare = ACPI_MEMCMP ((const char * ) operand0->buffer.pointer,
667 (const char * ) local_operand1->buffer.pointer,
668 (length0 > length1) ? length1 : length0);
669
670 switch (opcode) {
671 case AML_LEQUAL_OP: /* LEqual (Operand0, Operand1) */
672
673 /* Length and all bytes must be equal */
674
675 if ((length0 == length1) &&
676 (compare == 0)) {
677 /* Length and all bytes match ==> TRUE */
678
679 local_result = TRUE;
680 }
681 break;
682
683 case AML_LGREATER_OP: /* LGreater (Operand0, Operand1) */
684
685 if (compare > 0) {
686 local_result = TRUE;
687 goto cleanup; /* TRUE */
688 }
689 if (compare < 0) {
690 goto cleanup; /* FALSE */
691 }
692
693 /* Bytes match (to shortest length), compare lengths */
694
695 if (length0 > length1) {
696 local_result = TRUE;
697 }
698 break;
699
700 case AML_LLESS_OP: /* LLess (Operand0, Operand1) */
701
702 if (compare > 0) {
703 goto cleanup; /* FALSE */
704 }
705 if (compare < 0) {
706 local_result = TRUE;
707 goto cleanup; /* TRUE */
708 }
709
710 /* Bytes match (to shortest length), compare lengths */
711
712 if (length0 < length1) {
713 local_result = TRUE;
714 }
715 break;
716
717 default:
718 status = AE_AML_INTERNAL;
719 break;
720 }
721 }
722
723 cleanup:
724
725 /* New object was created if implicit conversion performed - delete */
726
727 if (local_operand1 != operand1) {
728 acpi_ut_remove_reference (local_operand1);
729 }
730
731 /* Return the logical result and status */
732
733 *logical_result = local_result;
734 return_ACPI_STATUS (status);
735 }
736
737
738
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