tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1
2/******************************************************************************
3 *
4 * Module Name: exoparg1 - AML execution - opcodes with 1 argument
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/acparser.h>
48#include <acpi/acdispat.h>
49#include <acpi/acinterp.h>
50#include <acpi/amlcode.h>
51#include <acpi/acnamesp.h>
52
53
54#define _COMPONENT ACPI_EXECUTER
55 ACPI_MODULE_NAME ("exoparg1")
56
57
58/*!
59 * Naming convention for AML interpreter execution routines.
60 *
61 * The routines that begin execution of AML opcodes are named with a common
62 * convention based upon the number of arguments, the number of target operands,
63 * and whether or not a value is returned:
64 *
65 * AcpiExOpcode_xA_yT_zR
66 *
67 * Where:
68 *
69 * xA - ARGUMENTS: The number of arguments (input operands) that are
70 * required for this opcode type (0 through 6 args).
71 * yT - TARGETS: The number of targets (output operands) that are required
72 * for this opcode type (0, 1, or 2 targets).
73 * zR - RETURN VALUE: Indicates whether this opcode type returns a value
74 * as the function return (0 or 1).
75 *
76 * The AcpiExOpcode* functions are called via the Dispatcher component with
77 * fully resolved operands.
78!*/
79
80/*******************************************************************************
81 *
82 * FUNCTION: acpi_ex_opcode_0A_0T_1R
83 *
84 * PARAMETERS: walk_state - Current state (contains AML opcode)
85 *
86 * RETURN: Status
87 *
88 * DESCRIPTION: Execute operator with no operands, one return value
89 *
90 ******************************************************************************/
91
92acpi_status
93acpi_ex_opcode_0A_0T_1R (
94 struct acpi_walk_state *walk_state)
95{
96 acpi_status status = AE_OK;
97 union acpi_operand_object *return_desc = NULL;
98
99
100 ACPI_FUNCTION_TRACE_STR ("ex_opcode_0A_0T_1R", acpi_ps_get_opcode_name (walk_state->opcode));
101
102
103 /* Examine the AML opcode */
104
105 switch (walk_state->opcode) {
106 case AML_TIMER_OP: /* Timer () */
107
108 /* Create a return object of type Integer */
109
110 return_desc = acpi_ut_create_internal_object (ACPI_TYPE_INTEGER);
111 if (!return_desc) {
112 status = AE_NO_MEMORY;
113 goto cleanup;
114 }
115
116 return_desc->integer.value = acpi_os_get_timer ();
117 break;
118
119 default: /* Unknown opcode */
120
121 ACPI_REPORT_ERROR (("acpi_ex_opcode_0A_0T_1R: Unknown opcode %X\n",
122 walk_state->opcode));
123 status = AE_AML_BAD_OPCODE;
124 break;
125 }
126
127cleanup:
128
129 if (!walk_state->result_obj) {
130 walk_state->result_obj = return_desc;
131 }
132
133 /* Delete return object on error */
134
135 if (ACPI_FAILURE (status)) {
136 acpi_ut_remove_reference (return_desc);
137 }
138
139 return_ACPI_STATUS (status);
140}
141
142
143/*******************************************************************************
144 *
145 * FUNCTION: acpi_ex_opcode_1A_0T_0R
146 *
147 * PARAMETERS: walk_state - Current state (contains AML opcode)
148 *
149 * RETURN: Status
150 *
151 * DESCRIPTION: Execute Type 1 monadic operator with numeric operand on
152 * object stack
153 *
154 ******************************************************************************/
155
156acpi_status
157acpi_ex_opcode_1A_0T_0R (
158 struct acpi_walk_state *walk_state)
159{
160 union acpi_operand_object **operand = &walk_state->operands[0];
161 acpi_status status = AE_OK;
162
163
164 ACPI_FUNCTION_TRACE_STR ("ex_opcode_1A_0T_0R", acpi_ps_get_opcode_name (walk_state->opcode));
165
166
167 /* Examine the AML opcode */
168
169 switch (walk_state->opcode) {
170 case AML_RELEASE_OP: /* Release (mutex_object) */
171
172 status = acpi_ex_release_mutex (operand[0], walk_state);
173 break;
174
175
176 case AML_RESET_OP: /* Reset (event_object) */
177
178 status = acpi_ex_system_reset_event (operand[0]);
179 break;
180
181
182 case AML_SIGNAL_OP: /* Signal (event_object) */
183
184 status = acpi_ex_system_signal_event (operand[0]);
185 break;
186
187
188 case AML_SLEEP_OP: /* Sleep (msec_time) */
189
190 status = acpi_ex_system_do_suspend (operand[0]->integer.value);
191 break;
192
193
194 case AML_STALL_OP: /* Stall (usec_time) */
195
196 status = acpi_ex_system_do_stall ((u32) operand[0]->integer.value);
197 break;
198
199
200 case AML_UNLOAD_OP: /* Unload (Handle) */
201
202 status = acpi_ex_unload_table (operand[0]);
203 break;
204
205
206 default: /* Unknown opcode */
207
208 ACPI_REPORT_ERROR (("acpi_ex_opcode_1A_0T_0R: Unknown opcode %X\n",
209 walk_state->opcode));
210 status = AE_AML_BAD_OPCODE;
211 break;
212 }
213
214 return_ACPI_STATUS (status);
215}
216
217
218/*******************************************************************************
219 *
220 * FUNCTION: acpi_ex_opcode_1A_1T_0R
221 *
222 * PARAMETERS: walk_state - Current state (contains AML opcode)
223 *
224 * RETURN: Status
225 *
226 * DESCRIPTION: Execute opcode with one argument, one target, and no
227 * return value.
228 *
229 ******************************************************************************/
230
231acpi_status
232acpi_ex_opcode_1A_1T_0R (
233 struct acpi_walk_state *walk_state)
234{
235 acpi_status status = AE_OK;
236 union acpi_operand_object **operand = &walk_state->operands[0];
237
238
239 ACPI_FUNCTION_TRACE_STR ("ex_opcode_1A_1T_0R", acpi_ps_get_opcode_name (walk_state->opcode));
240
241
242 /* Examine the AML opcode */
243
244 switch (walk_state->opcode) {
245 case AML_LOAD_OP:
246
247 status = acpi_ex_load_op (operand[0], operand[1], walk_state);
248 break;
249
250 default: /* Unknown opcode */
251
252 ACPI_REPORT_ERROR (("acpi_ex_opcode_1A_1T_0R: Unknown opcode %X\n",
253 walk_state->opcode));
254 status = AE_AML_BAD_OPCODE;
255 goto cleanup;
256 }
257
258
259cleanup:
260
261 return_ACPI_STATUS (status);
262}
263
264
265/*******************************************************************************
266 *
267 * FUNCTION: acpi_ex_opcode_1A_1T_1R
268 *
269 * PARAMETERS: walk_state - Current state (contains AML opcode)
270 *
271 * RETURN: Status
272 *
273 * DESCRIPTION: Execute opcode with one argument, one target, and a
274 * return value.
275 *
276 ******************************************************************************/
277
278acpi_status
279acpi_ex_opcode_1A_1T_1R (
280 struct acpi_walk_state *walk_state)
281{
282 acpi_status status = AE_OK;
283 union acpi_operand_object **operand = &walk_state->operands[0];
284 union acpi_operand_object *return_desc = NULL;
285 union acpi_operand_object *return_desc2 = NULL;
286 u32 temp32;
287 u32 i;
288 acpi_integer power_of_ten;
289 acpi_integer digit;
290
291
292 ACPI_FUNCTION_TRACE_STR ("ex_opcode_1A_1T_1R", acpi_ps_get_opcode_name (walk_state->opcode));
293
294
295 /* Examine the AML opcode */
296
297 switch (walk_state->opcode) {
298 case AML_BIT_NOT_OP:
299 case AML_FIND_SET_LEFT_BIT_OP:
300 case AML_FIND_SET_RIGHT_BIT_OP:
301 case AML_FROM_BCD_OP:
302 case AML_TO_BCD_OP:
303 case AML_COND_REF_OF_OP:
304
305 /* Create a return object of type Integer for these opcodes */
306
307 return_desc = acpi_ut_create_internal_object (ACPI_TYPE_INTEGER);
308 if (!return_desc) {
309 status = AE_NO_MEMORY;
310 goto cleanup;
311 }
312
313 switch (walk_state->opcode) {
314 case AML_BIT_NOT_OP: /* Not (Operand, Result) */
315
316 return_desc->integer.value = ~operand[0]->integer.value;
317 break;
318
319
320 case AML_FIND_SET_LEFT_BIT_OP: /* find_set_left_bit (Operand, Result) */
321
322 return_desc->integer.value = operand[0]->integer.value;
323
324 /*
325 * Acpi specification describes Integer type as a little
326 * endian unsigned value, so this boundary condition is valid.
327 */
328 for (temp32 = 0; return_desc->integer.value &&
329 temp32 < ACPI_INTEGER_BIT_SIZE; ++temp32) {
330 return_desc->integer.value >>= 1;
331 }
332
333 return_desc->integer.value = temp32;
334 break;
335
336
337 case AML_FIND_SET_RIGHT_BIT_OP: /* find_set_right_bit (Operand, Result) */
338
339 return_desc->integer.value = operand[0]->integer.value;
340
341 /*
342 * The Acpi specification describes Integer type as a little
343 * endian unsigned value, so this boundary condition is valid.
344 */
345 for (temp32 = 0; return_desc->integer.value &&
346 temp32 < ACPI_INTEGER_BIT_SIZE; ++temp32) {
347 return_desc->integer.value <<= 1;
348 }
349
350 /* Since the bit position is one-based, subtract from 33 (65) */
351
352 return_desc->integer.value = temp32 == 0 ? 0 :
353 (ACPI_INTEGER_BIT_SIZE + 1) - temp32;
354 break;
355
356
357 case AML_FROM_BCD_OP: /* from_bcd (BCDValue, Result) */
358
359 /*
360 * The 64-bit ACPI integer can hold 16 4-bit BCD characters
361 * (if table is 32-bit, integer can hold 8 BCD characters)
362 * Convert each 4-bit BCD value
363 */
364 power_of_ten = 1;
365 return_desc->integer.value = 0;
366 digit = operand[0]->integer.value;
367
368 /* Convert each BCD digit (each is one nybble wide) */
369
370 for (i = 0; (i < acpi_gbl_integer_nybble_width) && (digit > 0); i++) {
371 /* Get the least significant 4-bit BCD digit */
372
373 temp32 = ((u32) digit) & 0xF;
374
375 /* Check the range of the digit */
376
377 if (temp32 > 9) {
378 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
379 "BCD digit too large (not decimal): 0x%X\n",
380 temp32));
381
382 status = AE_AML_NUMERIC_OVERFLOW;
383 goto cleanup;
384 }
385
386 /* Sum the digit into the result with the current power of 10 */
387
388 return_desc->integer.value += (((acpi_integer) temp32) *
389 power_of_ten);
390
391 /* Shift to next BCD digit */
392
393 digit >>= 4;
394
395 /* Next power of 10 */
396
397 power_of_ten *= 10;
398 }
399 break;
400
401
402 case AML_TO_BCD_OP: /* to_bcd (Operand, Result) */
403
404 return_desc->integer.value = 0;
405 digit = operand[0]->integer.value;
406
407 /* Each BCD digit is one nybble wide */
408
409 for (i = 0; (i < acpi_gbl_integer_nybble_width) && (digit > 0); i++) {
410 (void) acpi_ut_short_divide (digit, 10, &digit, &temp32);
411
412 /* Insert the BCD digit that resides in the remainder from above */
413
414 return_desc->integer.value |= (((acpi_integer) temp32) <<
415 ACPI_MUL_4 (i));
416 }
417
418 /* Overflow if there is any data left in Digit */
419
420 if (digit > 0) {
421 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
422 "Integer too large to convert to BCD: %8.8X%8.8X\n",
423 ACPI_FORMAT_UINT64 (operand[0]->integer.value)));
424 status = AE_AML_NUMERIC_OVERFLOW;
425 goto cleanup;
426 }
427 break;
428
429
430 case AML_COND_REF_OF_OP: /* cond_ref_of (source_object, Result) */
431
432 /*
433 * This op is a little strange because the internal return value is
434 * different than the return value stored in the result descriptor
435 * (There are really two return values)
436 */
437 if ((struct acpi_namespace_node *) operand[0] == acpi_gbl_root_node) {
438 /*
439 * This means that the object does not exist in the namespace,
440 * return FALSE
441 */
442 return_desc->integer.value = 0;
443 goto cleanup;
444 }
445
446 /* Get the object reference, store it, and remove our reference */
447
448 status = acpi_ex_get_object_reference (operand[0], &return_desc2, walk_state);
449 if (ACPI_FAILURE (status)) {
450 goto cleanup;
451 }
452
453 status = acpi_ex_store (return_desc2, operand[1], walk_state);
454 acpi_ut_remove_reference (return_desc2);
455
456 /* The object exists in the namespace, return TRUE */
457
458 return_desc->integer.value = ACPI_INTEGER_MAX;
459 goto cleanup;
460
461
462 default:
463 /* No other opcodes get here */
464 break;
465 }
466 break;
467
468
469 case AML_STORE_OP: /* Store (Source, Target) */
470
471 /*
472 * A store operand is typically a number, string, buffer or lvalue
473 * Be careful about deleting the source object,
474 * since the object itself may have been stored.
475 */
476 status = acpi_ex_store (operand[0], operand[1], walk_state);
477 if (ACPI_FAILURE (status)) {
478 return_ACPI_STATUS (status);
479 }
480
481 /* It is possible that the Store already produced a return object */
482
483 if (!walk_state->result_obj) {
484 /*
485 * Normally, we would remove a reference on the Operand[0] parameter;
486 * But since it is being used as the internal return object
487 * (meaning we would normally increment it), the two cancel out,
488 * and we simply don't do anything.
489 */
490 walk_state->result_obj = operand[0];
491 walk_state->operands[0] = NULL; /* Prevent deletion */
492 }
493 return_ACPI_STATUS (status);
494
495
496 /*
497 * ACPI 2.0 Opcodes
498 */
499 case AML_COPY_OP: /* Copy (Source, Target) */
500
501 status = acpi_ut_copy_iobject_to_iobject (operand[0], &return_desc,
502 walk_state);
503 break;
504
505
506 case AML_TO_DECSTRING_OP: /* to_decimal_string (Data, Result) */
507
508 status = acpi_ex_convert_to_string (operand[0], &return_desc,
509 ACPI_EXPLICIT_CONVERT_DECIMAL);
510 if (return_desc == operand[0]) {
511 /* No conversion performed, add ref to handle return value */
512 acpi_ut_add_reference (return_desc);
513 }
514 break;
515
516
517 case AML_TO_HEXSTRING_OP: /* to_hex_string (Data, Result) */
518
519 status = acpi_ex_convert_to_string (operand[0], &return_desc,
520 ACPI_EXPLICIT_CONVERT_HEX);
521 if (return_desc == operand[0]) {
522 /* No conversion performed, add ref to handle return value */
523 acpi_ut_add_reference (return_desc);
524 }
525 break;
526
527
528 case AML_TO_BUFFER_OP: /* to_buffer (Data, Result) */
529
530 status = acpi_ex_convert_to_buffer (operand[0], &return_desc);
531 if (return_desc == operand[0]) {
532 /* No conversion performed, add ref to handle return value */
533 acpi_ut_add_reference (return_desc);
534 }
535 break;
536
537
538 case AML_TO_INTEGER_OP: /* to_integer (Data, Result) */
539
540 status = acpi_ex_convert_to_integer (operand[0], &return_desc,
541 ACPI_ANY_BASE);
542 if (return_desc == operand[0]) {
543 /* No conversion performed, add ref to handle return value */
544 acpi_ut_add_reference (return_desc);
545 }
546 break;
547
548
549 case AML_SHIFT_LEFT_BIT_OP: /* shift_left_bit (Source, bit_num) */
550 case AML_SHIFT_RIGHT_BIT_OP: /* shift_right_bit (Source, bit_num) */
551
552 /*
553 * These are two obsolete opcodes
554 */
555 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
556 "%s is obsolete and not implemented\n",
557 acpi_ps_get_opcode_name (walk_state->opcode)));
558 status = AE_SUPPORT;
559 goto cleanup;
560
561
562 default: /* Unknown opcode */
563
564 ACPI_REPORT_ERROR (("acpi_ex_opcode_1A_1T_1R: Unknown opcode %X\n",
565 walk_state->opcode));
566 status = AE_AML_BAD_OPCODE;
567 goto cleanup;
568 }
569
570 if (ACPI_SUCCESS (status)) {
571 /*
572 * Store the return value computed above into the target object
573 */
574 status = acpi_ex_store (return_desc, operand[1], walk_state);
575 }
576
577
578cleanup:
579
580 if (!walk_state->result_obj) {
581 walk_state->result_obj = return_desc;
582 }
583
584 /* Delete return object on error */
585
586 if (ACPI_FAILURE (status)) {
587 acpi_ut_remove_reference (return_desc);
588 }
589
590 return_ACPI_STATUS (status);
591}
592
593
594/*******************************************************************************
595 *
596 * FUNCTION: acpi_ex_opcode_1A_0T_1R
597 *
598 * PARAMETERS: walk_state - Current state (contains AML opcode)
599 *
600 * RETURN: Status
601 *
602 * DESCRIPTION: Execute opcode with one argument, no target, and a return value
603 *
604 ******************************************************************************/
605
606acpi_status
607acpi_ex_opcode_1A_0T_1R (
608 struct acpi_walk_state *walk_state)
609{
610 union acpi_operand_object **operand = &walk_state->operands[0];
611 union acpi_operand_object *temp_desc;
612 union acpi_operand_object *return_desc = NULL;
613 acpi_status status = AE_OK;
614 u32 type;
615 acpi_integer value;
616
617
618 ACPI_FUNCTION_TRACE_STR ("ex_opcode_1A_0T_1R", acpi_ps_get_opcode_name (walk_state->opcode));
619
620
621 /* Examine the AML opcode */
622
623 switch (walk_state->opcode) {
624 case AML_LNOT_OP: /* LNot (Operand) */
625
626 return_desc = acpi_ut_create_internal_object (ACPI_TYPE_INTEGER);
627 if (!return_desc) {
628 status = AE_NO_MEMORY;
629 goto cleanup;
630 }
631
632 /*
633 * Set result to ONES (TRUE) if Value == 0. Note:
634 * return_desc->Integer.Value is initially == 0 (FALSE) from above.
635 */
636 if (!operand[0]->integer.value) {
637 return_desc->integer.value = ACPI_INTEGER_MAX;
638 }
639 break;
640
641
642 case AML_DECREMENT_OP: /* Decrement (Operand) */
643 case AML_INCREMENT_OP: /* Increment (Operand) */
644
645 /*
646 * Create a new integer. Can't just get the base integer and
647 * increment it because it may be an Arg or Field.
648 */
649 return_desc = acpi_ut_create_internal_object (ACPI_TYPE_INTEGER);
650 if (!return_desc) {
651 status = AE_NO_MEMORY;
652 goto cleanup;
653 }
654
655 /*
656 * Since we are expecting a Reference operand, it can be either a
657 * NS Node or an internal object.
658 */
659 temp_desc = operand[0];
660 if (ACPI_GET_DESCRIPTOR_TYPE (temp_desc) == ACPI_DESC_TYPE_OPERAND) {
661 /* Internal reference object - prevent deletion */
662
663 acpi_ut_add_reference (temp_desc);
664 }
665
666 /*
667 * Convert the Reference operand to an Integer (This removes a
668 * reference on the Operand[0] object)
669 *
670 * NOTE: We use LNOT_OP here in order to force resolution of the
671 * reference operand to an actual integer.
672 */
673 status = acpi_ex_resolve_operands (AML_LNOT_OP, &temp_desc, walk_state);
674 if (ACPI_FAILURE (status)) {
675 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "%s: bad operand(s) %s\n",
676 acpi_ps_get_opcode_name (walk_state->opcode),
677 acpi_format_exception(status)));
678
679 goto cleanup;
680 }
681
682 /*
683 * temp_desc is now guaranteed to be an Integer object --
684 * Perform the actual increment or decrement
685 */
686 if (walk_state->opcode == AML_INCREMENT_OP) {
687 return_desc->integer.value = temp_desc->integer.value +1;
688 }
689 else {
690 return_desc->integer.value = temp_desc->integer.value -1;
691 }
692
693 /* Finished with this Integer object */
694
695 acpi_ut_remove_reference (temp_desc);
696
697 /*
698 * Store the result back (indirectly) through the original
699 * Reference object
700 */
701 status = acpi_ex_store (return_desc, operand[0], walk_state);
702 break;
703
704
705 case AML_TYPE_OP: /* object_type (source_object) */
706
707 /*
708 * Note: The operand is not resolved at this point because we want to
709 * get the associated object, not its value. For example, we don't want
710 * to resolve a field_unit to its value, we want the actual field_unit
711 * object.
712 */
713
714 /* Get the type of the base object */
715
716 status = acpi_ex_resolve_multiple (walk_state, operand[0], &type, NULL);
717 if (ACPI_FAILURE (status)) {
718 goto cleanup;
719 }
720 /* Allocate a descriptor to hold the type. */
721
722 return_desc = acpi_ut_create_internal_object (ACPI_TYPE_INTEGER);
723 if (!return_desc) {
724 status = AE_NO_MEMORY;
725 goto cleanup;
726 }
727
728 return_desc->integer.value = type;
729 break;
730
731
732 case AML_SIZE_OF_OP: /* size_of (source_object) */
733
734 /*
735 * Note: The operand is not resolved at this point because we want to
736 * get the associated object, not its value.
737 */
738
739 /* Get the base object */
740
741 status = acpi_ex_resolve_multiple (walk_state, operand[0], &type, &temp_desc);
742 if (ACPI_FAILURE (status)) {
743 goto cleanup;
744 }
745
746 /*
747 * The type of the base object must be integer, buffer, string, or
748 * package. All others are not supported.
749 *
750 * NOTE: Integer is not specifically supported by the ACPI spec,
751 * but is supported implicitly via implicit operand conversion.
752 * rather than bother with conversion, we just use the byte width
753 * global (4 or 8 bytes).
754 */
755 switch (type) {
756 case ACPI_TYPE_INTEGER:
757 value = acpi_gbl_integer_byte_width;
758 break;
759
760 case ACPI_TYPE_BUFFER:
761 value = temp_desc->buffer.length;
762 break;
763
764 case ACPI_TYPE_STRING:
765 value = temp_desc->string.length;
766 break;
767
768 case ACPI_TYPE_PACKAGE:
769 value = temp_desc->package.count;
770 break;
771
772 default:
773 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
774 "size_of - Operand is not Buf/Int/Str/Pkg - found type %s\n",
775 acpi_ut_get_type_name (type)));
776 status = AE_AML_OPERAND_TYPE;
777 goto cleanup;
778 }
779
780 /*
781 * Now that we have the size of the object, create a result
782 * object to hold the value
783 */
784 return_desc = acpi_ut_create_internal_object (ACPI_TYPE_INTEGER);
785 if (!return_desc) {
786 status = AE_NO_MEMORY;
787 goto cleanup;
788 }
789
790 return_desc->integer.value = value;
791 break;
792
793
794 case AML_REF_OF_OP: /* ref_of (source_object) */
795
796 status = acpi_ex_get_object_reference (operand[0], &return_desc, walk_state);
797 if (ACPI_FAILURE (status)) {
798 goto cleanup;
799 }
800 break;
801
802
803 case AML_DEREF_OF_OP: /* deref_of (obj_reference | String) */
804
805 /* Check for a method local or argument, or standalone String */
806
807 if (ACPI_GET_DESCRIPTOR_TYPE (operand[0]) != ACPI_DESC_TYPE_NAMED) {
808 switch (ACPI_GET_OBJECT_TYPE (operand[0])) {
809 case ACPI_TYPE_LOCAL_REFERENCE:
810 /*
811 * This is a deref_of (local_x | arg_x)
812 *
813 * Must resolve/dereference the local/arg reference first
814 */
815 switch (operand[0]->reference.opcode) {
816 case AML_LOCAL_OP:
817 case AML_ARG_OP:
818
819 /* Set Operand[0] to the value of the local/arg */
820
821 status = acpi_ds_method_data_get_value (operand[0]->reference.opcode,
822 operand[0]->reference.offset, walk_state, &temp_desc);
823 if (ACPI_FAILURE (status)) {
824 goto cleanup;
825 }
826
827 /*
828 * Delete our reference to the input object and
829 * point to the object just retrieved
830 */
831 acpi_ut_remove_reference (operand[0]);
832 operand[0] = temp_desc;
833 break;
834
835 case AML_REF_OF_OP:
836
837 /* Get the object to which the reference refers */
838
839 temp_desc = operand[0]->reference.object;
840 acpi_ut_remove_reference (operand[0]);
841 operand[0] = temp_desc;
842 break;
843
844 default:
845
846 /* Must be an Index op - handled below */
847 break;
848 }
849 break;
850
851
852 case ACPI_TYPE_STRING:
853
854 /*
855 * This is a deref_of (String). The string is a reference to a named ACPI object.
856 *
857 * 1) Find the owning Node
858 * 2) Dereference the node to an actual object. Could be a Field, so we nee
859 * to resolve the node to a value.
860 */
861 status = acpi_ns_get_node_by_path (operand[0]->string.pointer,
862 walk_state->scope_info->scope.node, ACPI_NS_SEARCH_PARENT,
863 ACPI_CAST_INDIRECT_PTR (struct acpi_namespace_node, &return_desc));
864 if (ACPI_FAILURE (status)) {
865 goto cleanup;
866 }
867
868 status = acpi_ex_resolve_node_to_value (
869 ACPI_CAST_INDIRECT_PTR (struct acpi_namespace_node, &return_desc), walk_state);
870 goto cleanup;
871
872
873 default:
874
875 status = AE_AML_OPERAND_TYPE;
876 goto cleanup;
877 }
878 }
879
880 /* Operand[0] may have changed from the code above */
881
882 if (ACPI_GET_DESCRIPTOR_TYPE (operand[0]) == ACPI_DESC_TYPE_NAMED) {
883 /*
884 * This is a deref_of (object_reference)
885 * Get the actual object from the Node (This is the dereference).
886 * -- This case may only happen when a local_x or arg_x is dereferenced above.
887 */
888 return_desc = acpi_ns_get_attached_object ((struct acpi_namespace_node *) operand[0]);
889 }
890 else {
891 /*
892 * This must be a reference object produced by either the Index() or
893 * ref_of() operator
894 */
895 switch (operand[0]->reference.opcode) {
896 case AML_INDEX_OP:
897
898 /*
899 * The target type for the Index operator must be
900 * either a Buffer or a Package
901 */
902 switch (operand[0]->reference.target_type) {
903 case ACPI_TYPE_BUFFER_FIELD:
904
905 temp_desc = operand[0]->reference.object;
906
907 /*
908 * Create a new object that contains one element of the
909 * buffer -- the element pointed to by the index.
910 *
911 * NOTE: index into a buffer is NOT a pointer to a
912 * sub-buffer of the main buffer, it is only a pointer to a
913 * single element (byte) of the buffer!
914 */
915 return_desc = acpi_ut_create_internal_object (ACPI_TYPE_INTEGER);
916 if (!return_desc) {
917 status = AE_NO_MEMORY;
918 goto cleanup;
919 }
920
921 /*
922 * Since we are returning the value of the buffer at the
923 * indexed location, we don't need to add an additional
924 * reference to the buffer itself.
925 */
926 return_desc->integer.value =
927 temp_desc->buffer.pointer[operand[0]->reference.offset];
928 break;
929
930
931 case ACPI_TYPE_PACKAGE:
932
933 /*
934 * Return the referenced element of the package. We must add
935 * another reference to the referenced object, however.
936 */
937 return_desc = *(operand[0]->reference.where);
938 if (!return_desc) {
939 /*
940 * We can't return a NULL dereferenced value. This is
941 * an uninitialized package element and is thus a
942 * severe error.
943 */
944 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
945 "NULL package element obj %p\n",
946 operand[0]));
947 status = AE_AML_UNINITIALIZED_ELEMENT;
948 goto cleanup;
949 }
950
951 acpi_ut_add_reference (return_desc);
952 break;
953
954
955 default:
956
957 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
958 "Unknown Index target_type %X in obj %p\n",
959 operand[0]->reference.target_type, operand[0]));
960 status = AE_AML_OPERAND_TYPE;
961 goto cleanup;
962 }
963 break;
964
965
966 case AML_REF_OF_OP:
967
968 return_desc = operand[0]->reference.object;
969
970 if (ACPI_GET_DESCRIPTOR_TYPE (return_desc) == ACPI_DESC_TYPE_NAMED) {
971
972 return_desc = acpi_ns_get_attached_object ((struct acpi_namespace_node *) return_desc);
973 }
974
975 /* Add another reference to the object! */
976
977 acpi_ut_add_reference (return_desc);
978 break;
979
980
981 default:
982 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
983 "Unknown opcode in ref(%p) - %X\n",
984 operand[0], operand[0]->reference.opcode));
985
986 status = AE_TYPE;
987 goto cleanup;
988 }
989 }
990 break;
991
992
993 default:
994
995 ACPI_REPORT_ERROR (("acpi_ex_opcode_1A_0T_1R: Unknown opcode %X\n",
996 walk_state->opcode));
997 status = AE_AML_BAD_OPCODE;
998 goto cleanup;
999 }
1000
1001
1002cleanup:
1003
1004 /* Delete return object on error */
1005
1006 if (ACPI_FAILURE (status)) {
1007 acpi_ut_remove_reference (return_desc);
1008 }
1009
1010 walk_state->result_obj = return_desc;
1011 return_ACPI_STATUS (status);
1012}
1013