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ACPICA: Restructure includes into public/private
[deliverable/linux.git] / drivers / acpi / executer / exoparg1.c
1
2 /******************************************************************************
3 *
4 * Module Name: exoparg1 - AML execution - opcodes with 1 argument
5 *
6 *****************************************************************************/
7
8 /*
9 * Copyright (C) 2000 - 2008, 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 #include <acpi/acpi.h>
46 #include <acpi/accommon.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 #define _COMPONENT ACPI_EXECUTER
54 ACPI_MODULE_NAME("exoparg1")
55
56 /*!
57 * Naming convention for AML interpreter execution routines.
58 *
59 * The routines that begin execution of AML opcodes are named with a common
60 * convention based upon the number of arguments, the number of target operands,
61 * and whether or not a value is returned:
62 *
63 * AcpiExOpcode_xA_yT_zR
64 *
65 * Where:
66 *
67 * xA - ARGUMENTS: The number of arguments (input operands) that are
68 * required for this opcode type (0 through 6 args).
69 * yT - TARGETS: The number of targets (output operands) that are required
70 * for this opcode type (0, 1, or 2 targets).
71 * zR - RETURN VALUE: Indicates whether this opcode type returns a value
72 * as the function return (0 or 1).
73 *
74 * The AcpiExOpcode* functions are called via the Dispatcher component with
75 * fully resolved operands.
76 !*/
77 /*******************************************************************************
78 *
79 * FUNCTION: acpi_ex_opcode_0A_0T_1R
80 *
81 * PARAMETERS: walk_state - Current state (contains AML opcode)
82 *
83 * RETURN: Status
84 *
85 * DESCRIPTION: Execute operator with no operands, one return value
86 *
87 ******************************************************************************/
88 acpi_status acpi_ex_opcode_0A_0T_1R(struct acpi_walk_state *walk_state)
89 {
90 acpi_status status = AE_OK;
91 union acpi_operand_object *return_desc = NULL;
92
93 ACPI_FUNCTION_TRACE_STR(ex_opcode_0A_0T_1R,
94 acpi_ps_get_opcode_name(walk_state->opcode));
95
96 /* Examine the AML opcode */
97
98 switch (walk_state->opcode) {
99 case AML_TIMER_OP: /* Timer () */
100
101 /* Create a return object of type Integer */
102
103 return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
104 if (!return_desc) {
105 status = AE_NO_MEMORY;
106 goto cleanup;
107 }
108 return_desc->integer.value = acpi_os_get_timer();
109 break;
110
111 default: /* Unknown opcode */
112
113 ACPI_ERROR((AE_INFO, "Unknown AML opcode %X",
114 walk_state->opcode));
115 status = AE_AML_BAD_OPCODE;
116 break;
117 }
118
119 cleanup:
120
121 /* Delete return object on error */
122
123 if ((ACPI_FAILURE(status)) || walk_state->result_obj) {
124 acpi_ut_remove_reference(return_desc);
125 walk_state->result_obj = NULL;
126 } else {
127 /* Save the return value */
128
129 walk_state->result_obj = return_desc;
130 }
131
132 return_ACPI_STATUS(status);
133 }
134
135 /*******************************************************************************
136 *
137 * FUNCTION: acpi_ex_opcode_1A_0T_0R
138 *
139 * PARAMETERS: walk_state - Current state (contains AML opcode)
140 *
141 * RETURN: Status
142 *
143 * DESCRIPTION: Execute Type 1 monadic operator with numeric operand on
144 * object stack
145 *
146 ******************************************************************************/
147
148 acpi_status acpi_ex_opcode_1A_0T_0R(struct acpi_walk_state *walk_state)
149 {
150 union acpi_operand_object **operand = &walk_state->operands[0];
151 acpi_status status = AE_OK;
152
153 ACPI_FUNCTION_TRACE_STR(ex_opcode_1A_0T_0R,
154 acpi_ps_get_opcode_name(walk_state->opcode));
155
156 /* Examine the AML opcode */
157
158 switch (walk_state->opcode) {
159 case AML_RELEASE_OP: /* Release (mutex_object) */
160
161 status = acpi_ex_release_mutex(operand[0], walk_state);
162 break;
163
164 case AML_RESET_OP: /* Reset (event_object) */
165
166 status = acpi_ex_system_reset_event(operand[0]);
167 break;
168
169 case AML_SIGNAL_OP: /* Signal (event_object) */
170
171 status = acpi_ex_system_signal_event(operand[0]);
172 break;
173
174 case AML_SLEEP_OP: /* Sleep (msec_time) */
175
176 status = acpi_ex_system_do_suspend(operand[0]->integer.value);
177 break;
178
179 case AML_STALL_OP: /* Stall (usec_time) */
180
181 status =
182 acpi_ex_system_do_stall((u32) operand[0]->integer.value);
183 break;
184
185 case AML_UNLOAD_OP: /* Unload (Handle) */
186
187 status = acpi_ex_unload_table(operand[0]);
188 break;
189
190 default: /* Unknown opcode */
191
192 ACPI_ERROR((AE_INFO, "Unknown AML opcode %X",
193 walk_state->opcode));
194 status = AE_AML_BAD_OPCODE;
195 break;
196 }
197
198 return_ACPI_STATUS(status);
199 }
200
201 /*******************************************************************************
202 *
203 * FUNCTION: acpi_ex_opcode_1A_1T_0R
204 *
205 * PARAMETERS: walk_state - Current state (contains AML opcode)
206 *
207 * RETURN: Status
208 *
209 * DESCRIPTION: Execute opcode with one argument, one target, and no
210 * return value.
211 *
212 ******************************************************************************/
213
214 acpi_status acpi_ex_opcode_1A_1T_0R(struct acpi_walk_state *walk_state)
215 {
216 acpi_status status = AE_OK;
217 union acpi_operand_object **operand = &walk_state->operands[0];
218
219 ACPI_FUNCTION_TRACE_STR(ex_opcode_1A_1T_0R,
220 acpi_ps_get_opcode_name(walk_state->opcode));
221
222 /* Examine the AML opcode */
223
224 switch (walk_state->opcode) {
225 case AML_LOAD_OP:
226
227 status = acpi_ex_load_op(operand[0], operand[1], walk_state);
228 break;
229
230 default: /* Unknown opcode */
231
232 ACPI_ERROR((AE_INFO, "Unknown AML opcode %X",
233 walk_state->opcode));
234 status = AE_AML_BAD_OPCODE;
235 goto cleanup;
236 }
237
238 cleanup:
239
240 return_ACPI_STATUS(status);
241 }
242
243 /*******************************************************************************
244 *
245 * FUNCTION: acpi_ex_opcode_1A_1T_1R
246 *
247 * PARAMETERS: walk_state - Current state (contains AML opcode)
248 *
249 * RETURN: Status
250 *
251 * DESCRIPTION: Execute opcode with one argument, one target, and a
252 * return value.
253 *
254 ******************************************************************************/
255
256 acpi_status acpi_ex_opcode_1A_1T_1R(struct acpi_walk_state *walk_state)
257 {
258 acpi_status status = AE_OK;
259 union acpi_operand_object **operand = &walk_state->operands[0];
260 union acpi_operand_object *return_desc = NULL;
261 union acpi_operand_object *return_desc2 = NULL;
262 u32 temp32;
263 u32 i;
264 acpi_integer power_of_ten;
265 acpi_integer digit;
266
267 ACPI_FUNCTION_TRACE_STR(ex_opcode_1A_1T_1R,
268 acpi_ps_get_opcode_name(walk_state->opcode));
269
270 /* Examine the AML opcode */
271
272 switch (walk_state->opcode) {
273 case AML_BIT_NOT_OP:
274 case AML_FIND_SET_LEFT_BIT_OP:
275 case AML_FIND_SET_RIGHT_BIT_OP:
276 case AML_FROM_BCD_OP:
277 case AML_TO_BCD_OP:
278 case AML_COND_REF_OF_OP:
279
280 /* Create a return object of type Integer for these opcodes */
281
282 return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
283 if (!return_desc) {
284 status = AE_NO_MEMORY;
285 goto cleanup;
286 }
287
288 switch (walk_state->opcode) {
289 case AML_BIT_NOT_OP: /* Not (Operand, Result) */
290
291 return_desc->integer.value = ~operand[0]->integer.value;
292 break;
293
294 case AML_FIND_SET_LEFT_BIT_OP: /* find_set_left_bit (Operand, Result) */
295
296 return_desc->integer.value = operand[0]->integer.value;
297
298 /*
299 * Acpi specification describes Integer type as a little
300 * endian unsigned value, so this boundary condition is valid.
301 */
302 for (temp32 = 0; return_desc->integer.value &&
303 temp32 < ACPI_INTEGER_BIT_SIZE; ++temp32) {
304 return_desc->integer.value >>= 1;
305 }
306
307 return_desc->integer.value = temp32;
308 break;
309
310 case AML_FIND_SET_RIGHT_BIT_OP: /* find_set_right_bit (Operand, Result) */
311
312 return_desc->integer.value = operand[0]->integer.value;
313
314 /*
315 * The Acpi specification describes Integer type as a little
316 * endian unsigned value, so this boundary condition is valid.
317 */
318 for (temp32 = 0; return_desc->integer.value &&
319 temp32 < ACPI_INTEGER_BIT_SIZE; ++temp32) {
320 return_desc->integer.value <<= 1;
321 }
322
323 /* Since the bit position is one-based, subtract from 33 (65) */
324
325 return_desc->integer.value =
326 temp32 ==
327 0 ? 0 : (ACPI_INTEGER_BIT_SIZE + 1) - temp32;
328 break;
329
330 case AML_FROM_BCD_OP: /* from_bcd (BCDValue, Result) */
331
332 /*
333 * The 64-bit ACPI integer can hold 16 4-bit BCD characters
334 * (if table is 32-bit, integer can hold 8 BCD characters)
335 * Convert each 4-bit BCD value
336 */
337 power_of_ten = 1;
338 return_desc->integer.value = 0;
339 digit = operand[0]->integer.value;
340
341 /* Convert each BCD digit (each is one nybble wide) */
342
343 for (i = 0;
344 (i < acpi_gbl_integer_nybble_width) && (digit > 0);
345 i++) {
346
347 /* Get the least significant 4-bit BCD digit */
348
349 temp32 = ((u32) digit) & 0xF;
350
351 /* Check the range of the digit */
352
353 if (temp32 > 9) {
354 ACPI_ERROR((AE_INFO,
355 "BCD digit too large (not decimal): 0x%X",
356 temp32));
357
358 status = AE_AML_NUMERIC_OVERFLOW;
359 goto cleanup;
360 }
361
362 /* Sum the digit into the result with the current power of 10 */
363
364 return_desc->integer.value +=
365 (((acpi_integer) temp32) * power_of_ten);
366
367 /* Shift to next BCD digit */
368
369 digit >>= 4;
370
371 /* Next power of 10 */
372
373 power_of_ten *= 10;
374 }
375 break;
376
377 case AML_TO_BCD_OP: /* to_bcd (Operand, Result) */
378
379 return_desc->integer.value = 0;
380 digit = operand[0]->integer.value;
381
382 /* Each BCD digit is one nybble wide */
383
384 for (i = 0;
385 (i < acpi_gbl_integer_nybble_width) && (digit > 0);
386 i++) {
387 (void)acpi_ut_short_divide(digit, 10, &digit,
388 &temp32);
389
390 /*
391 * Insert the BCD digit that resides in the
392 * remainder from above
393 */
394 return_desc->integer.value |=
395 (((acpi_integer) temp32) << ACPI_MUL_4(i));
396 }
397
398 /* Overflow if there is any data left in Digit */
399
400 if (digit > 0) {
401 ACPI_ERROR((AE_INFO,
402 "Integer too large to convert to BCD: %8.8X%8.8X",
403 ACPI_FORMAT_UINT64(operand[0]->
404 integer.value)));
405 status = AE_AML_NUMERIC_OVERFLOW;
406 goto cleanup;
407 }
408 break;
409
410 case AML_COND_REF_OF_OP: /* cond_ref_of (source_object, Result) */
411
412 /*
413 * This op is a little strange because the internal return value is
414 * different than the return value stored in the result descriptor
415 * (There are really two return values)
416 */
417 if ((struct acpi_namespace_node *)operand[0] ==
418 acpi_gbl_root_node) {
419 /*
420 * This means that the object does not exist in the namespace,
421 * return FALSE
422 */
423 return_desc->integer.value = 0;
424 goto cleanup;
425 }
426
427 /* Get the object reference, store it, and remove our reference */
428
429 status = acpi_ex_get_object_reference(operand[0],
430 &return_desc2,
431 walk_state);
432 if (ACPI_FAILURE(status)) {
433 goto cleanup;
434 }
435
436 status =
437 acpi_ex_store(return_desc2, operand[1], walk_state);
438 acpi_ut_remove_reference(return_desc2);
439
440 /* The object exists in the namespace, return TRUE */
441
442 return_desc->integer.value = ACPI_INTEGER_MAX;
443 goto cleanup;
444
445 default:
446 /* No other opcodes get here */
447 break;
448 }
449 break;
450
451 case AML_STORE_OP: /* Store (Source, Target) */
452
453 /*
454 * A store operand is typically a number, string, buffer or lvalue
455 * Be careful about deleting the source object,
456 * since the object itself may have been stored.
457 */
458 status = acpi_ex_store(operand[0], operand[1], walk_state);
459 if (ACPI_FAILURE(status)) {
460 return_ACPI_STATUS(status);
461 }
462
463 /* It is possible that the Store already produced a return object */
464
465 if (!walk_state->result_obj) {
466 /*
467 * Normally, we would remove a reference on the Operand[0]
468 * parameter; But since it is being used as the internal return
469 * object (meaning we would normally increment it), the two
470 * cancel out, and we simply don't do anything.
471 */
472 walk_state->result_obj = operand[0];
473 walk_state->operands[0] = NULL; /* Prevent deletion */
474 }
475 return_ACPI_STATUS(status);
476
477 /*
478 * ACPI 2.0 Opcodes
479 */
480 case AML_COPY_OP: /* Copy (Source, Target) */
481
482 status =
483 acpi_ut_copy_iobject_to_iobject(operand[0], &return_desc,
484 walk_state);
485 break;
486
487 case AML_TO_DECSTRING_OP: /* to_decimal_string (Data, Result) */
488
489 status = acpi_ex_convert_to_string(operand[0], &return_desc,
490 ACPI_EXPLICIT_CONVERT_DECIMAL);
491 if (return_desc == operand[0]) {
492
493 /* No conversion performed, add ref to handle return value */
494 acpi_ut_add_reference(return_desc);
495 }
496 break;
497
498 case AML_TO_HEXSTRING_OP: /* to_hex_string (Data, Result) */
499
500 status = acpi_ex_convert_to_string(operand[0], &return_desc,
501 ACPI_EXPLICIT_CONVERT_HEX);
502 if (return_desc == operand[0]) {
503
504 /* No conversion performed, add ref to handle return value */
505 acpi_ut_add_reference(return_desc);
506 }
507 break;
508
509 case AML_TO_BUFFER_OP: /* to_buffer (Data, Result) */
510
511 status = acpi_ex_convert_to_buffer(operand[0], &return_desc);
512 if (return_desc == operand[0]) {
513
514 /* No conversion performed, add ref to handle return value */
515 acpi_ut_add_reference(return_desc);
516 }
517 break;
518
519 case AML_TO_INTEGER_OP: /* to_integer (Data, Result) */
520
521 status = acpi_ex_convert_to_integer(operand[0], &return_desc,
522 ACPI_ANY_BASE);
523 if (return_desc == operand[0]) {
524
525 /* No conversion performed, add ref to handle return value */
526 acpi_ut_add_reference(return_desc);
527 }
528 break;
529
530 case AML_SHIFT_LEFT_BIT_OP: /* shift_left_bit (Source, bit_num) */
531 case AML_SHIFT_RIGHT_BIT_OP: /* shift_right_bit (Source, bit_num) */
532
533 /* These are two obsolete opcodes */
534
535 ACPI_ERROR((AE_INFO,
536 "%s is obsolete and not implemented",
537 acpi_ps_get_opcode_name(walk_state->opcode)));
538 status = AE_SUPPORT;
539 goto cleanup;
540
541 default: /* Unknown opcode */
542
543 ACPI_ERROR((AE_INFO, "Unknown AML opcode %X",
544 walk_state->opcode));
545 status = AE_AML_BAD_OPCODE;
546 goto cleanup;
547 }
548
549 if (ACPI_SUCCESS(status)) {
550
551 /* Store the return value computed above into the target object */
552
553 status = acpi_ex_store(return_desc, operand[1], walk_state);
554 }
555
556 cleanup:
557
558 /* Delete return object on error */
559
560 if (ACPI_FAILURE(status)) {
561 acpi_ut_remove_reference(return_desc);
562 }
563
564 /* Save return object on success */
565
566 else if (!walk_state->result_obj) {
567 walk_state->result_obj = return_desc;
568 }
569
570 return_ACPI_STATUS(status);
571 }
572
573 /*******************************************************************************
574 *
575 * FUNCTION: acpi_ex_opcode_1A_0T_1R
576 *
577 * PARAMETERS: walk_state - Current state (contains AML opcode)
578 *
579 * RETURN: Status
580 *
581 * DESCRIPTION: Execute opcode with one argument, no target, and a return value
582 *
583 ******************************************************************************/
584
585 acpi_status acpi_ex_opcode_1A_0T_1R(struct acpi_walk_state *walk_state)
586 {
587 union acpi_operand_object **operand = &walk_state->operands[0];
588 union acpi_operand_object *temp_desc;
589 union acpi_operand_object *return_desc = NULL;
590 acpi_status status = AE_OK;
591 u32 type;
592 acpi_integer value;
593
594 ACPI_FUNCTION_TRACE_STR(ex_opcode_1A_0T_1R,
595 acpi_ps_get_opcode_name(walk_state->opcode));
596
597 /* Examine the AML opcode */
598
599 switch (walk_state->opcode) {
600 case AML_LNOT_OP: /* LNot (Operand) */
601
602 return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
603 if (!return_desc) {
604 status = AE_NO_MEMORY;
605 goto cleanup;
606 }
607
608 /*
609 * Set result to ONES (TRUE) if Value == 0. Note:
610 * return_desc->Integer.Value is initially == 0 (FALSE) from above.
611 */
612 if (!operand[0]->integer.value) {
613 return_desc->integer.value = ACPI_INTEGER_MAX;
614 }
615 break;
616
617 case AML_DECREMENT_OP: /* Decrement (Operand) */
618 case AML_INCREMENT_OP: /* Increment (Operand) */
619
620 /*
621 * Create a new integer. Can't just get the base integer and
622 * increment it because it may be an Arg or Field.
623 */
624 return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
625 if (!return_desc) {
626 status = AE_NO_MEMORY;
627 goto cleanup;
628 }
629
630 /*
631 * Since we are expecting a Reference operand, it can be either a
632 * NS Node or an internal object.
633 */
634 temp_desc = operand[0];
635 if (ACPI_GET_DESCRIPTOR_TYPE(temp_desc) ==
636 ACPI_DESC_TYPE_OPERAND) {
637
638 /* Internal reference object - prevent deletion */
639
640 acpi_ut_add_reference(temp_desc);
641 }
642
643 /*
644 * Convert the Reference operand to an Integer (This removes a
645 * reference on the Operand[0] object)
646 *
647 * NOTE: We use LNOT_OP here in order to force resolution of the
648 * reference operand to an actual integer.
649 */
650 status =
651 acpi_ex_resolve_operands(AML_LNOT_OP, &temp_desc,
652 walk_state);
653 if (ACPI_FAILURE(status)) {
654 ACPI_EXCEPTION((AE_INFO, status,
655 "While resolving operands for [%s]",
656 acpi_ps_get_opcode_name(walk_state->
657 opcode)));
658
659 goto cleanup;
660 }
661
662 /*
663 * temp_desc is now guaranteed to be an Integer object --
664 * Perform the actual increment or decrement
665 */
666 if (walk_state->opcode == AML_INCREMENT_OP) {
667 return_desc->integer.value =
668 temp_desc->integer.value + 1;
669 } else {
670 return_desc->integer.value =
671 temp_desc->integer.value - 1;
672 }
673
674 /* Finished with this Integer object */
675
676 acpi_ut_remove_reference(temp_desc);
677
678 /*
679 * Store the result back (indirectly) through the original
680 * Reference object
681 */
682 status = acpi_ex_store(return_desc, operand[0], walk_state);
683 break;
684
685 case AML_TYPE_OP: /* object_type (source_object) */
686
687 /*
688 * Note: The operand is not resolved at this point because we want to
689 * get the associated object, not its value. For example, we don't
690 * want to resolve a field_unit to its value, we want the actual
691 * field_unit object.
692 */
693
694 /* Get the type of the base object */
695
696 status =
697 acpi_ex_resolve_multiple(walk_state, operand[0], &type,
698 NULL);
699 if (ACPI_FAILURE(status)) {
700 goto cleanup;
701 }
702
703 /* Allocate a descriptor to hold the type. */
704
705 return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
706 if (!return_desc) {
707 status = AE_NO_MEMORY;
708 goto cleanup;
709 }
710
711 return_desc->integer.value = type;
712 break;
713
714 case AML_SIZE_OF_OP: /* size_of (source_object) */
715
716 /*
717 * Note: The operand is not resolved at this point because we want to
718 * get the associated object, not its value.
719 */
720
721 /* Get the base object */
722
723 status = acpi_ex_resolve_multiple(walk_state,
724 operand[0], &type,
725 &temp_desc);
726 if (ACPI_FAILURE(status)) {
727 goto cleanup;
728 }
729
730 /*
731 * The type of the base object must be integer, buffer, string, or
732 * package. All others are not supported.
733 *
734 * NOTE: Integer is not specifically supported by the ACPI spec,
735 * but is supported implicitly via implicit operand conversion.
736 * rather than bother with conversion, we just use the byte width
737 * global (4 or 8 bytes).
738 */
739 switch (type) {
740 case ACPI_TYPE_INTEGER:
741 value = acpi_gbl_integer_byte_width;
742 break;
743
744 case ACPI_TYPE_STRING:
745 value = temp_desc->string.length;
746 break;
747
748 case ACPI_TYPE_BUFFER:
749
750 /* Buffer arguments may not be evaluated at this point */
751
752 status = acpi_ds_get_buffer_arguments(temp_desc);
753 value = temp_desc->buffer.length;
754 break;
755
756 case ACPI_TYPE_PACKAGE:
757
758 /* Package arguments may not be evaluated at this point */
759
760 status = acpi_ds_get_package_arguments(temp_desc);
761 value = temp_desc->package.count;
762 break;
763
764 default:
765 ACPI_ERROR((AE_INFO,
766 "Operand must be Buffer/Integer/String/Package - found type %s",
767 acpi_ut_get_type_name(type)));
768 status = AE_AML_OPERAND_TYPE;
769 goto cleanup;
770 }
771
772 if (ACPI_FAILURE(status)) {
773 goto cleanup;
774 }
775
776 /*
777 * Now that we have the size of the object, create a result
778 * object to hold the value
779 */
780 return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
781 if (!return_desc) {
782 status = AE_NO_MEMORY;
783 goto cleanup;
784 }
785
786 return_desc->integer.value = value;
787 break;
788
789 case AML_REF_OF_OP: /* ref_of (source_object) */
790
791 status =
792 acpi_ex_get_object_reference(operand[0], &return_desc,
793 walk_state);
794 if (ACPI_FAILURE(status)) {
795 goto cleanup;
796 }
797 break;
798
799 case AML_DEREF_OF_OP: /* deref_of (obj_reference | String) */
800
801 /* Check for a method local or argument, or standalone String */
802
803 if (ACPI_GET_DESCRIPTOR_TYPE(operand[0]) ==
804 ACPI_DESC_TYPE_NAMED) {
805 temp_desc =
806 acpi_ns_get_attached_object((struct
807 acpi_namespace_node *)
808 operand[0]);
809 if (temp_desc
810 &&
811 ((ACPI_GET_OBJECT_TYPE(temp_desc) ==
812 ACPI_TYPE_STRING)
813 || (ACPI_GET_OBJECT_TYPE(temp_desc) ==
814 ACPI_TYPE_LOCAL_REFERENCE))) {
815 operand[0] = temp_desc;
816 acpi_ut_add_reference(temp_desc);
817 } else {
818 status = AE_AML_OPERAND_TYPE;
819 goto cleanup;
820 }
821 } else {
822 switch (ACPI_GET_OBJECT_TYPE(operand[0])) {
823 case ACPI_TYPE_LOCAL_REFERENCE:
824 /*
825 * This is a deref_of (local_x | arg_x)
826 *
827 * Must resolve/dereference the local/arg reference first
828 */
829 switch (operand[0]->reference.class) {
830 case ACPI_REFCLASS_LOCAL:
831 case ACPI_REFCLASS_ARG:
832
833 /* Set Operand[0] to the value of the local/arg */
834
835 status =
836 acpi_ds_method_data_get_value
837 (operand[0]->reference.class,
838 operand[0]->reference.value,
839 walk_state, &temp_desc);
840 if (ACPI_FAILURE(status)) {
841 goto cleanup;
842 }
843
844 /*
845 * Delete our reference to the input object and
846 * point to the object just retrieved
847 */
848 acpi_ut_remove_reference(operand[0]);
849 operand[0] = temp_desc;
850 break;
851
852 case ACPI_REFCLASS_REFOF:
853
854 /* Get the object to which the reference refers */
855
856 temp_desc =
857 operand[0]->reference.object;
858 acpi_ut_remove_reference(operand[0]);
859 operand[0] = temp_desc;
860 break;
861
862 default:
863
864 /* Must be an Index op - handled below */
865 break;
866 }
867 break;
868
869 case ACPI_TYPE_STRING:
870 break;
871
872 default:
873 status = AE_AML_OPERAND_TYPE;
874 goto cleanup;
875 }
876 }
877
878 if (ACPI_GET_DESCRIPTOR_TYPE(operand[0]) !=
879 ACPI_DESC_TYPE_NAMED) {
880 if (ACPI_GET_OBJECT_TYPE(operand[0]) ==
881 ACPI_TYPE_STRING) {
882 /*
883 * This is a deref_of (String). The string is a reference
884 * to a named ACPI object.
885 *
886 * 1) Find the owning Node
887 * 2) Dereference the node to an actual object. Could be a
888 * Field, so we need to resolve the node to a value.
889 */
890 status =
891 acpi_ns_get_node(walk_state->scope_info->
892 scope.node,
893 operand[0]->string.pointer,
894 ACPI_NS_SEARCH_PARENT,
895 ACPI_CAST_INDIRECT_PTR
896 (struct
897 acpi_namespace_node,
898 &return_desc));
899 if (ACPI_FAILURE(status)) {
900 goto cleanup;
901 }
902
903 status =
904 acpi_ex_resolve_node_to_value
905 (ACPI_CAST_INDIRECT_PTR
906 (struct acpi_namespace_node, &return_desc),
907 walk_state);
908 goto cleanup;
909 }
910 }
911
912 /* Operand[0] may have changed from the code above */
913
914 if (ACPI_GET_DESCRIPTOR_TYPE(operand[0]) ==
915 ACPI_DESC_TYPE_NAMED) {
916 /*
917 * This is a deref_of (object_reference)
918 * Get the actual object from the Node (This is the dereference).
919 * This case may only happen when a local_x or arg_x is
920 * dereferenced above.
921 */
922 return_desc = acpi_ns_get_attached_object((struct
923 acpi_namespace_node
924 *)
925 operand[0]);
926 acpi_ut_add_reference(return_desc);
927 } else {
928 /*
929 * This must be a reference object produced by either the
930 * Index() or ref_of() operator
931 */
932 switch (operand[0]->reference.class) {
933 case ACPI_REFCLASS_INDEX:
934
935 /*
936 * The target type for the Index operator must be
937 * either a Buffer or a Package
938 */
939 switch (operand[0]->reference.target_type) {
940 case ACPI_TYPE_BUFFER_FIELD:
941
942 temp_desc =
943 operand[0]->reference.object;
944
945 /*
946 * Create a new object that contains one element of the
947 * buffer -- the element pointed to by the index.
948 *
949 * NOTE: index into a buffer is NOT a pointer to a
950 * sub-buffer of the main buffer, it is only a pointer to a
951 * single element (byte) of the buffer!
952 */
953 return_desc =
954 acpi_ut_create_internal_object
955 (ACPI_TYPE_INTEGER);
956 if (!return_desc) {
957 status = AE_NO_MEMORY;
958 goto cleanup;
959 }
960
961 /*
962 * Since we are returning the value of the buffer at the
963 * indexed location, we don't need to add an additional
964 * reference to the buffer itself.
965 */
966 return_desc->integer.value =
967 temp_desc->buffer.
968 pointer[operand[0]->reference.
969 value];
970 break;
971
972 case ACPI_TYPE_PACKAGE:
973
974 /*
975 * Return the referenced element of the package. We must
976 * add another reference to the referenced object, however.
977 */
978 return_desc =
979 *(operand[0]->reference.where);
980 if (return_desc) {
981 acpi_ut_add_reference
982 (return_desc);
983 }
984 break;
985
986 default:
987
988 ACPI_ERROR((AE_INFO,
989 "Unknown Index TargetType %X in reference object %p",
990 operand[0]->reference.
991 target_type, operand[0]));
992 status = AE_AML_OPERAND_TYPE;
993 goto cleanup;
994 }
995 break;
996
997 case ACPI_REFCLASS_REFOF:
998
999 return_desc = operand[0]->reference.object;
1000
1001 if (ACPI_GET_DESCRIPTOR_TYPE(return_desc) ==
1002 ACPI_DESC_TYPE_NAMED) {
1003 return_desc =
1004 acpi_ns_get_attached_object((struct
1005 acpi_namespace_node
1006 *)
1007 return_desc);
1008 }
1009
1010 /* Add another reference to the object! */
1011
1012 acpi_ut_add_reference(return_desc);
1013 break;
1014
1015 default:
1016 ACPI_ERROR((AE_INFO,
1017 "Unknown class in reference(%p) - %2.2X",
1018 operand[0],
1019 operand[0]->reference.class));
1020
1021 status = AE_TYPE;
1022 goto cleanup;
1023 }
1024 }
1025 break;
1026
1027 default:
1028
1029 ACPI_ERROR((AE_INFO, "Unknown AML opcode %X",
1030 walk_state->opcode));
1031 status = AE_AML_BAD_OPCODE;
1032 goto cleanup;
1033 }
1034
1035 cleanup:
1036
1037 /* Delete return object on error */
1038
1039 if (ACPI_FAILURE(status)) {
1040 acpi_ut_remove_reference(return_desc);
1041 }
1042
1043 /* Save return object on success */
1044
1045 else {
1046 walk_state->result_obj = return_desc;
1047 }
1048
1049 return_ACPI_STATUS(status);
1050 }
Linux kernel - Deliverables
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