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Pull error-inject into release branch
[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 - 2007, R. Byron Moore
10 * All rights reserved.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions, and the following disclaimer,
17 * without modification.
18 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
19 * substantially similar to the "NO WARRANTY" disclaimer below
20 * ("Disclaimer") and any redistribution must be conditioned upon
21 * including a substantially similar Disclaimer requirement for further
22 * binary redistribution.
23 * 3. Neither the names of the above-listed copyright holders nor the names
24 * of any contributors may be used to endorse or promote products derived
25 * from this software without specific prior written permission.
26 *
27 * Alternatively, this software may be distributed under the terms of the
28 * GNU General Public License ("GPL") version 2 as published by the Free
29 * Software Foundation.
30 *
31 * NO WARRANTY
32 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
33 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
34 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
35 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
36 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
37 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
38 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
39 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
40 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
41 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
42 * POSSIBILITY OF SUCH DAMAGES.
43 */
44
45 #include <acpi/acpi.h>
46 #include <acpi/acparser.h>
47 #include <acpi/acdispat.h>
48 #include <acpi/acinterp.h>
49 #include <acpi/amlcode.h>
50 #include <acpi/acnamesp.h>
51
52 #define _COMPONENT ACPI_EXECUTER
53 ACPI_MODULE_NAME("exoparg1")
54
55 /*!
56 * Naming convention for AML interpreter execution routines.
57 *
58 * The routines that begin execution of AML opcodes are named with a common
59 * convention based upon the number of arguments, the number of target operands,
60 * and whether or not a value is returned:
61 *
62 * AcpiExOpcode_xA_yT_zR
63 *
64 * Where:
65 *
66 * xA - ARGUMENTS: The number of arguments (input operands) that are
67 * required for this opcode type (0 through 6 args).
68 * yT - TARGETS: The number of targets (output operands) that are required
69 * for this opcode type (0, 1, or 2 targets).
70 * zR - RETURN VALUE: Indicates whether this opcode type returns a value
71 * as the function return (0 or 1).
72 *
73 * The AcpiExOpcode* functions are called via the Dispatcher component with
74 * fully resolved operands.
75 !*/
76 /*******************************************************************************
77 *
78 * FUNCTION: acpi_ex_opcode_0A_0T_1R
79 *
80 * PARAMETERS: walk_state - Current state (contains AML opcode)
81 *
82 * RETURN: Status
83 *
84 * DESCRIPTION: Execute operator with no operands, one return value
85 *
86 ******************************************************************************/
87 acpi_status acpi_ex_opcode_0A_0T_1R(struct acpi_walk_state *walk_state)
88 {
89 acpi_status status = AE_OK;
90 union acpi_operand_object *return_desc = NULL;
91
92 ACPI_FUNCTION_TRACE_STR(ex_opcode_0A_0T_1R,
93 acpi_ps_get_opcode_name(walk_state->opcode));
94
95 /* Examine the AML opcode */
96
97 switch (walk_state->opcode) {
98 case AML_TIMER_OP: /* Timer () */
99
100 /* Create a return object of type Integer */
101
102 return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
103 if (!return_desc) {
104 status = AE_NO_MEMORY;
105 goto cleanup;
106 }
107 return_desc->integer.value = acpi_os_get_timer();
108 break;
109
110 default: /* Unknown opcode */
111
112 ACPI_ERROR((AE_INFO, "Unknown AML opcode %X",
113 walk_state->opcode));
114 status = AE_AML_BAD_OPCODE;
115 break;
116 }
117
118 cleanup:
119
120 /* Delete return object on error */
121
122 if ((ACPI_FAILURE(status)) || walk_state->result_obj) {
123 acpi_ut_remove_reference(return_desc);
124 } else {
125 /* Save the return value */
126
127 walk_state->result_obj = return_desc;
128 }
129
130 return_ACPI_STATUS(status);
131 }
132
133 /*******************************************************************************
134 *
135 * FUNCTION: acpi_ex_opcode_1A_0T_0R
136 *
137 * PARAMETERS: walk_state - Current state (contains AML opcode)
138 *
139 * RETURN: Status
140 *
141 * DESCRIPTION: Execute Type 1 monadic operator with numeric operand on
142 * object stack
143 *
144 ******************************************************************************/
145
146 acpi_status acpi_ex_opcode_1A_0T_0R(struct acpi_walk_state *walk_state)
147 {
148 union acpi_operand_object **operand = &walk_state->operands[0];
149 acpi_status status = AE_OK;
150
151 ACPI_FUNCTION_TRACE_STR(ex_opcode_1A_0T_0R,
152 acpi_ps_get_opcode_name(walk_state->opcode));
153
154 /* Examine the AML opcode */
155
156 switch (walk_state->opcode) {
157 case AML_RELEASE_OP: /* Release (mutex_object) */
158
159 status = acpi_ex_release_mutex(operand[0], walk_state);
160 break;
161
162 case AML_RESET_OP: /* Reset (event_object) */
163
164 status = acpi_ex_system_reset_event(operand[0]);
165 break;
166
167 case AML_SIGNAL_OP: /* Signal (event_object) */
168
169 status = acpi_ex_system_signal_event(operand[0]);
170 break;
171
172 case AML_SLEEP_OP: /* Sleep (msec_time) */
173
174 status = acpi_ex_system_do_suspend(operand[0]->integer.value);
175 break;
176
177 case AML_STALL_OP: /* Stall (usec_time) */
178
179 status =
180 acpi_ex_system_do_stall((u32) operand[0]->integer.value);
181 break;
182
183 case AML_UNLOAD_OP: /* Unload (Handle) */
184
185 status = acpi_ex_unload_table(operand[0]);
186 break;
187
188 default: /* Unknown opcode */
189
190 ACPI_ERROR((AE_INFO, "Unknown AML opcode %X",
191 walk_state->opcode));
192 status = AE_AML_BAD_OPCODE;
193 break;
194 }
195
196 return_ACPI_STATUS(status);
197 }
198
199 /*******************************************************************************
200 *
201 * FUNCTION: acpi_ex_opcode_1A_1T_0R
202 *
203 * PARAMETERS: walk_state - Current state (contains AML opcode)
204 *
205 * RETURN: Status
206 *
207 * DESCRIPTION: Execute opcode with one argument, one target, and no
208 * return value.
209 *
210 ******************************************************************************/
211
212 acpi_status acpi_ex_opcode_1A_1T_0R(struct acpi_walk_state *walk_state)
213 {
214 acpi_status status = AE_OK;
215 union acpi_operand_object **operand = &walk_state->operands[0];
216
217 ACPI_FUNCTION_TRACE_STR(ex_opcode_1A_1T_0R,
218 acpi_ps_get_opcode_name(walk_state->opcode));
219
220 /* Examine the AML opcode */
221
222 switch (walk_state->opcode) {
223 case AML_LOAD_OP:
224
225 status = acpi_ex_load_op(operand[0], operand[1], walk_state);
226 break;
227
228 default: /* Unknown opcode */
229
230 ACPI_ERROR((AE_INFO, "Unknown AML opcode %X",
231 walk_state->opcode));
232 status = AE_AML_BAD_OPCODE;
233 goto cleanup;
234 }
235
236 cleanup:
237
238 return_ACPI_STATUS(status);
239 }
240
241 /*******************************************************************************
242 *
243 * FUNCTION: acpi_ex_opcode_1A_1T_1R
244 *
245 * PARAMETERS: walk_state - Current state (contains AML opcode)
246 *
247 * RETURN: Status
248 *
249 * DESCRIPTION: Execute opcode with one argument, one target, and a
250 * return value.
251 *
252 ******************************************************************************/
253
254 acpi_status acpi_ex_opcode_1A_1T_1R(struct acpi_walk_state *walk_state)
255 {
256 acpi_status status = AE_OK;
257 union acpi_operand_object **operand = &walk_state->operands[0];
258 union acpi_operand_object *return_desc = NULL;
259 union acpi_operand_object *return_desc2 = NULL;
260 u32 temp32;
261 u32 i;
262 acpi_integer power_of_ten;
263 acpi_integer digit;
264
265 ACPI_FUNCTION_TRACE_STR(ex_opcode_1A_1T_1R,
266 acpi_ps_get_opcode_name(walk_state->opcode));
267
268 /* Examine the AML opcode */
269
270 switch (walk_state->opcode) {
271 case AML_BIT_NOT_OP:
272 case AML_FIND_SET_LEFT_BIT_OP:
273 case AML_FIND_SET_RIGHT_BIT_OP:
274 case AML_FROM_BCD_OP:
275 case AML_TO_BCD_OP:
276 case AML_COND_REF_OF_OP:
277
278 /* Create a return object of type Integer for these opcodes */
279
280 return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
281 if (!return_desc) {
282 status = AE_NO_MEMORY;
283 goto cleanup;
284 }
285
286 switch (walk_state->opcode) {
287 case AML_BIT_NOT_OP: /* Not (Operand, Result) */
288
289 return_desc->integer.value = ~operand[0]->integer.value;
290 break;
291
292 case AML_FIND_SET_LEFT_BIT_OP: /* find_set_left_bit (Operand, Result) */
293
294 return_desc->integer.value = operand[0]->integer.value;
295
296 /*
297 * Acpi specification describes Integer type as a little
298 * endian unsigned value, so this boundary condition is valid.
299 */
300 for (temp32 = 0; return_desc->integer.value &&
301 temp32 < ACPI_INTEGER_BIT_SIZE; ++temp32) {
302 return_desc->integer.value >>= 1;
303 }
304
305 return_desc->integer.value = temp32;
306 break;
307
308 case AML_FIND_SET_RIGHT_BIT_OP: /* find_set_right_bit (Operand, Result) */
309
310 return_desc->integer.value = operand[0]->integer.value;
311
312 /*
313 * The Acpi specification describes Integer type as a little
314 * endian unsigned value, so this boundary condition is valid.
315 */
316 for (temp32 = 0; return_desc->integer.value &&
317 temp32 < ACPI_INTEGER_BIT_SIZE; ++temp32) {
318 return_desc->integer.value <<= 1;
319 }
320
321 /* Since the bit position is one-based, subtract from 33 (65) */
322
323 return_desc->integer.value =
324 temp32 ==
325 0 ? 0 : (ACPI_INTEGER_BIT_SIZE + 1) - temp32;
326 break;
327
328 case AML_FROM_BCD_OP: /* from_bcd (BCDValue, Result) */
329
330 /*
331 * The 64-bit ACPI integer can hold 16 4-bit BCD characters
332 * (if table is 32-bit, integer can hold 8 BCD characters)
333 * Convert each 4-bit BCD value
334 */
335 power_of_ten = 1;
336 return_desc->integer.value = 0;
337 digit = operand[0]->integer.value;
338
339 /* Convert each BCD digit (each is one nybble wide) */
340
341 for (i = 0;
342 (i < acpi_gbl_integer_nybble_width) && (digit > 0);
343 i++) {
344
345 /* Get the least significant 4-bit BCD digit */
346
347 temp32 = ((u32) digit) & 0xF;
348
349 /* Check the range of the digit */
350
351 if (temp32 > 9) {
352 ACPI_ERROR((AE_INFO,
353 "BCD digit too large (not decimal): 0x%X",
354 temp32));
355
356 status = AE_AML_NUMERIC_OVERFLOW;
357 goto cleanup;
358 }
359
360 /* Sum the digit into the result with the current power of 10 */
361
362 return_desc->integer.value +=
363 (((acpi_integer) temp32) * power_of_ten);
364
365 /* Shift to next BCD digit */
366
367 digit >>= 4;
368
369 /* Next power of 10 */
370
371 power_of_ten *= 10;
372 }
373 break;
374
375 case AML_TO_BCD_OP: /* to_bcd (Operand, Result) */
376
377 return_desc->integer.value = 0;
378 digit = operand[0]->integer.value;
379
380 /* Each BCD digit is one nybble wide */
381
382 for (i = 0;
383 (i < acpi_gbl_integer_nybble_width) && (digit > 0);
384 i++) {
385 (void)acpi_ut_short_divide(digit, 10, &digit,
386 &temp32);
387
388 /*
389 * Insert the BCD digit that resides in the
390 * remainder from above
391 */
392 return_desc->integer.value |=
393 (((acpi_integer) temp32) << ACPI_MUL_4(i));
394 }
395
396 /* Overflow if there is any data left in Digit */
397
398 if (digit > 0) {
399 ACPI_ERROR((AE_INFO,
400 "Integer too large to convert to BCD: %8.8X%8.8X",
401 ACPI_FORMAT_UINT64(operand[0]->
402 integer.value)));
403 status = AE_AML_NUMERIC_OVERFLOW;
404 goto cleanup;
405 }
406 break;
407
408 case AML_COND_REF_OF_OP: /* cond_ref_of (source_object, Result) */
409
410 /*
411 * This op is a little strange because the internal return value is
412 * different than the return value stored in the result descriptor
413 * (There are really two return values)
414 */
415 if ((struct acpi_namespace_node *)operand[0] ==
416 acpi_gbl_root_node) {
417 /*
418 * This means that the object does not exist in the namespace,
419 * return FALSE
420 */
421 return_desc->integer.value = 0;
422 goto cleanup;
423 }
424
425 /* Get the object reference, store it, and remove our reference */
426
427 status = acpi_ex_get_object_reference(operand[0],
428 &return_desc2,
429 walk_state);
430 if (ACPI_FAILURE(status)) {
431 goto cleanup;
432 }
433
434 status =
435 acpi_ex_store(return_desc2, operand[1], walk_state);
436 acpi_ut_remove_reference(return_desc2);
437
438 /* The object exists in the namespace, return TRUE */
439
440 return_desc->integer.value = ACPI_INTEGER_MAX;
441 goto cleanup;
442
443 default:
444 /* No other opcodes get here */
445 break;
446 }
447 break;
448
449 case AML_STORE_OP: /* Store (Source, Target) */
450
451 /*
452 * A store operand is typically a number, string, buffer or lvalue
453 * Be careful about deleting the source object,
454 * since the object itself may have been stored.
455 */
456 status = acpi_ex_store(operand[0], operand[1], walk_state);
457 if (ACPI_FAILURE(status)) {
458 return_ACPI_STATUS(status);
459 }
460
461 /* It is possible that the Store already produced a return object */
462
463 if (!walk_state->result_obj) {
464 /*
465 * Normally, we would remove a reference on the Operand[0]
466 * parameter; But since it is being used as the internal return
467 * object (meaning we would normally increment it), the two
468 * cancel out, and we simply don't do anything.
469 */
470 walk_state->result_obj = operand[0];
471 walk_state->operands[0] = NULL; /* Prevent deletion */
472 }
473 return_ACPI_STATUS(status);
474
475 /*
476 * ACPI 2.0 Opcodes
477 */
478 case AML_COPY_OP: /* Copy (Source, Target) */
479
480 status =
481 acpi_ut_copy_iobject_to_iobject(operand[0], &return_desc,
482 walk_state);
483 break;
484
485 case AML_TO_DECSTRING_OP: /* to_decimal_string (Data, Result) */
486
487 status = acpi_ex_convert_to_string(operand[0], &return_desc,
488 ACPI_EXPLICIT_CONVERT_DECIMAL);
489 if (return_desc == operand[0]) {
490
491 /* No conversion performed, add ref to handle return value */
492 acpi_ut_add_reference(return_desc);
493 }
494 break;
495
496 case AML_TO_HEXSTRING_OP: /* to_hex_string (Data, Result) */
497
498 status = acpi_ex_convert_to_string(operand[0], &return_desc,
499 ACPI_EXPLICIT_CONVERT_HEX);
500 if (return_desc == operand[0]) {
501
502 /* No conversion performed, add ref to handle return value */
503 acpi_ut_add_reference(return_desc);
504 }
505 break;
506
507 case AML_TO_BUFFER_OP: /* to_buffer (Data, Result) */
508
509 status = acpi_ex_convert_to_buffer(operand[0], &return_desc);
510 if (return_desc == operand[0]) {
511
512 /* No conversion performed, add ref to handle return value */
513 acpi_ut_add_reference(return_desc);
514 }
515 break;
516
517 case AML_TO_INTEGER_OP: /* to_integer (Data, Result) */
518
519 status = acpi_ex_convert_to_integer(operand[0], &return_desc,
520 ACPI_ANY_BASE);
521 if (return_desc == operand[0]) {
522
523 /* No conversion performed, add ref to handle return value */
524 acpi_ut_add_reference(return_desc);
525 }
526 break;
527
528 case AML_SHIFT_LEFT_BIT_OP: /* shift_left_bit (Source, bit_num) */
529 case AML_SHIFT_RIGHT_BIT_OP: /* shift_right_bit (Source, bit_num) */
530
531 /* These are two obsolete opcodes */
532
533 ACPI_ERROR((AE_INFO,
534 "%s is obsolete and not implemented",
535 acpi_ps_get_opcode_name(walk_state->opcode)));
536 status = AE_SUPPORT;
537 goto cleanup;
538
539 default: /* Unknown opcode */
540
541 ACPI_ERROR((AE_INFO, "Unknown AML opcode %X",
542 walk_state->opcode));
543 status = AE_AML_BAD_OPCODE;
544 goto cleanup;
545 }
546
547 if (ACPI_SUCCESS(status)) {
548
549 /* Store the return value computed above into the target object */
550
551 status = acpi_ex_store(return_desc, operand[1], walk_state);
552 }
553
554 cleanup:
555
556 /* Delete return object on error */
557
558 if (ACPI_FAILURE(status)) {
559 acpi_ut_remove_reference(return_desc);
560 }
561
562 /* Save return object on success */
563
564 else if (!walk_state->result_obj) {
565 walk_state->result_obj = return_desc;
566 }
567
568 return_ACPI_STATUS(status);
569 }
570
571 /*******************************************************************************
572 *
573 * FUNCTION: acpi_ex_opcode_1A_0T_1R
574 *
575 * PARAMETERS: walk_state - Current state (contains AML opcode)
576 *
577 * RETURN: Status
578 *
579 * DESCRIPTION: Execute opcode with one argument, no target, and a return value
580 *
581 ******************************************************************************/
582
583 acpi_status acpi_ex_opcode_1A_0T_1R(struct acpi_walk_state *walk_state)
584 {
585 union acpi_operand_object **operand = &walk_state->operands[0];
586 union acpi_operand_object *temp_desc;
587 union acpi_operand_object *return_desc = NULL;
588 acpi_status status = AE_OK;
589 u32 type;
590 acpi_integer value;
591
592 ACPI_FUNCTION_TRACE_STR(ex_opcode_1A_0T_1R,
593 acpi_ps_get_opcode_name(walk_state->opcode));
594
595 /* Examine the AML opcode */
596
597 switch (walk_state->opcode) {
598 case AML_LNOT_OP: /* LNot (Operand) */
599
600 return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
601 if (!return_desc) {
602 status = AE_NO_MEMORY;
603 goto cleanup;
604 }
605
606 /*
607 * Set result to ONES (TRUE) if Value == 0. Note:
608 * return_desc->Integer.Value is initially == 0 (FALSE) from above.
609 */
610 if (!operand[0]->integer.value) {
611 return_desc->integer.value = ACPI_INTEGER_MAX;
612 }
613 break;
614
615 case AML_DECREMENT_OP: /* Decrement (Operand) */
616 case AML_INCREMENT_OP: /* Increment (Operand) */
617
618 /*
619 * Create a new integer. Can't just get the base integer and
620 * increment it because it may be an Arg or Field.
621 */
622 return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
623 if (!return_desc) {
624 status = AE_NO_MEMORY;
625 goto cleanup;
626 }
627
628 /*
629 * Since we are expecting a Reference operand, it can be either a
630 * NS Node or an internal object.
631 */
632 temp_desc = operand[0];
633 if (ACPI_GET_DESCRIPTOR_TYPE(temp_desc) ==
634 ACPI_DESC_TYPE_OPERAND) {
635
636 /* Internal reference object - prevent deletion */
637
638 acpi_ut_add_reference(temp_desc);
639 }
640
641 /*
642 * Convert the Reference operand to an Integer (This removes a
643 * reference on the Operand[0] object)
644 *
645 * NOTE: We use LNOT_OP here in order to force resolution of the
646 * reference operand to an actual integer.
647 */
648 status =
649 acpi_ex_resolve_operands(AML_LNOT_OP, &temp_desc,
650 walk_state);
651 if (ACPI_FAILURE(status)) {
652 ACPI_EXCEPTION((AE_INFO, status,
653 "While resolving operands for [%s]",
654 acpi_ps_get_opcode_name(walk_state->
655 opcode)));
656
657 goto cleanup;
658 }
659
660 /*
661 * temp_desc is now guaranteed to be an Integer object --
662 * Perform the actual increment or decrement
663 */
664 if (walk_state->opcode == AML_INCREMENT_OP) {
665 return_desc->integer.value =
666 temp_desc->integer.value + 1;
667 } else {
668 return_desc->integer.value =
669 temp_desc->integer.value - 1;
670 }
671
672 /* Finished with this Integer object */
673
674 acpi_ut_remove_reference(temp_desc);
675
676 /*
677 * Store the result back (indirectly) through the original
678 * Reference object
679 */
680 status = acpi_ex_store(return_desc, operand[0], walk_state);
681 break;
682
683 case AML_TYPE_OP: /* object_type (source_object) */
684
685 /*
686 * Note: The operand is not resolved at this point because we want to
687 * get the associated object, not its value. For example, we don't
688 * want to resolve a field_unit to its value, we want the actual
689 * field_unit object.
690 */
691
692 /* Get the type of the base object */
693
694 status =
695 acpi_ex_resolve_multiple(walk_state, operand[0], &type,
696 NULL);
697 if (ACPI_FAILURE(status)) {
698 goto cleanup;
699 }
700
701 /* Allocate a descriptor to hold the type. */
702
703 return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
704 if (!return_desc) {
705 status = AE_NO_MEMORY;
706 goto cleanup;
707 }
708
709 return_desc->integer.value = type;
710 break;
711
712 case AML_SIZE_OF_OP: /* size_of (source_object) */
713
714 /*
715 * Note: The operand is not resolved at this point because we want to
716 * get the associated object, not its value.
717 */
718
719 /* Get the base object */
720
721 status = acpi_ex_resolve_multiple(walk_state,
722 operand[0], &type,
723 &temp_desc);
724 if (ACPI_FAILURE(status)) {
725 goto cleanup;
726 }
727
728 /*
729 * The type of the base object must be integer, buffer, string, or
730 * package. All others are not supported.
731 *
732 * NOTE: Integer is not specifically supported by the ACPI spec,
733 * but is supported implicitly via implicit operand conversion.
734 * rather than bother with conversion, we just use the byte width
735 * global (4 or 8 bytes).
736 */
737 switch (type) {
738 case ACPI_TYPE_INTEGER:
739 value = acpi_gbl_integer_byte_width;
740 break;
741
742 case ACPI_TYPE_BUFFER:
743 value = temp_desc->buffer.length;
744 break;
745
746 case ACPI_TYPE_STRING:
747 value = temp_desc->string.length;
748 break;
749
750 case ACPI_TYPE_PACKAGE:
751 value = temp_desc->package.count;
752 break;
753
754 default:
755 ACPI_ERROR((AE_INFO,
756 "Operand is not Buf/Int/Str/Pkg - found type %s",
757 acpi_ut_get_type_name(type)));
758 status = AE_AML_OPERAND_TYPE;
759 goto cleanup;
760 }
761
762 /*
763 * Now that we have the size of the object, create a result
764 * object to hold the value
765 */
766 return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
767 if (!return_desc) {
768 status = AE_NO_MEMORY;
769 goto cleanup;
770 }
771
772 return_desc->integer.value = value;
773 break;
774
775 case AML_REF_OF_OP: /* ref_of (source_object) */
776
777 status =
778 acpi_ex_get_object_reference(operand[0], &return_desc,
779 walk_state);
780 if (ACPI_FAILURE(status)) {
781 goto cleanup;
782 }
783 break;
784
785 case AML_DEREF_OF_OP: /* deref_of (obj_reference | String) */
786
787 /* Check for a method local or argument, or standalone String */
788
789 if (ACPI_GET_DESCRIPTOR_TYPE(operand[0]) ==
790 ACPI_DESC_TYPE_NAMED) {
791 temp_desc =
792 acpi_ns_get_attached_object((struct
793 acpi_namespace_node *)
794 operand[0]);
795 if (temp_desc
796 &&
797 ((ACPI_GET_OBJECT_TYPE(temp_desc) ==
798 ACPI_TYPE_STRING)
799 || (ACPI_GET_OBJECT_TYPE(temp_desc) ==
800 ACPI_TYPE_LOCAL_REFERENCE))) {
801 operand[0] = temp_desc;
802 acpi_ut_add_reference(temp_desc);
803 } else {
804 status = AE_AML_OPERAND_TYPE;
805 goto cleanup;
806 }
807 } else {
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 =
822 acpi_ds_method_data_get_value
823 (operand[0]->reference.opcode,
824 operand[0]->reference.offset,
825 walk_state, &temp_desc);
826 if (ACPI_FAILURE(status)) {
827 goto cleanup;
828 }
829
830 /*
831 * Delete our reference to the input object and
832 * point to the object just retrieved
833 */
834 acpi_ut_remove_reference(operand[0]);
835 operand[0] = temp_desc;
836 break;
837
838 case AML_REF_OF_OP:
839
840 /* Get the object to which the reference refers */
841
842 temp_desc =
843 operand[0]->reference.object;
844 acpi_ut_remove_reference(operand[0]);
845 operand[0] = temp_desc;
846 break;
847
848 default:
849
850 /* Must be an Index op - handled below */
851 break;
852 }
853 break;
854
855 case ACPI_TYPE_STRING:
856 break;
857
858 default:
859 status = AE_AML_OPERAND_TYPE;
860 goto cleanup;
861 }
862 }
863
864 if (ACPI_GET_DESCRIPTOR_TYPE(operand[0]) !=
865 ACPI_DESC_TYPE_NAMED) {
866 if (ACPI_GET_OBJECT_TYPE(operand[0]) ==
867 ACPI_TYPE_STRING) {
868 /*
869 * This is a deref_of (String). The string is a reference
870 * to a named ACPI object.
871 *
872 * 1) Find the owning Node
873 * 2) Dereference the node to an actual object. Could be a
874 * Field, so we need to resolve the node to a value.
875 */
876 status =
877 acpi_ns_get_node(walk_state->scope_info->
878 scope.node,
879 operand[0]->string.pointer,
880 ACPI_NS_SEARCH_PARENT,
881 ACPI_CAST_INDIRECT_PTR
882 (struct
883 acpi_namespace_node,
884 &return_desc));
885 if (ACPI_FAILURE(status)) {
886 goto cleanup;
887 }
888
889 status =
890 acpi_ex_resolve_node_to_value
891 (ACPI_CAST_INDIRECT_PTR
892 (struct acpi_namespace_node, &return_desc),
893 walk_state);
894 goto cleanup;
895 }
896 }
897
898 /* Operand[0] may have changed from the code above */
899
900 if (ACPI_GET_DESCRIPTOR_TYPE(operand[0]) ==
901 ACPI_DESC_TYPE_NAMED) {
902 /*
903 * This is a deref_of (object_reference)
904 * Get the actual object from the Node (This is the dereference).
905 * This case may only happen when a local_x or arg_x is
906 * dereferenced above.
907 */
908 return_desc = acpi_ns_get_attached_object((struct
909 acpi_namespace_node
910 *)
911 operand[0]);
912 acpi_ut_add_reference(return_desc);
913 } else {
914 /*
915 * This must be a reference object produced by either the
916 * Index() or ref_of() operator
917 */
918 switch (operand[0]->reference.opcode) {
919 case AML_INDEX_OP:
920
921 /*
922 * The target type for the Index operator must be
923 * either a Buffer or a Package
924 */
925 switch (operand[0]->reference.target_type) {
926 case ACPI_TYPE_BUFFER_FIELD:
927
928 temp_desc =
929 operand[0]->reference.object;
930
931 /*
932 * Create a new object that contains one element of the
933 * buffer -- the element pointed to by the index.
934 *
935 * NOTE: index into a buffer is NOT a pointer to a
936 * sub-buffer of the main buffer, it is only a pointer to a
937 * single element (byte) of the buffer!
938 */
939 return_desc =
940 acpi_ut_create_internal_object
941 (ACPI_TYPE_INTEGER);
942 if (!return_desc) {
943 status = AE_NO_MEMORY;
944 goto cleanup;
945 }
946
947 /*
948 * Since we are returning the value of the buffer at the
949 * indexed location, we don't need to add an additional
950 * reference to the buffer itself.
951 */
952 return_desc->integer.value =
953 temp_desc->buffer.
954 pointer[operand[0]->reference.
955 offset];
956 break;
957
958 case ACPI_TYPE_PACKAGE:
959
960 /*
961 * Return the referenced element of the package. We must
962 * add another reference to the referenced object, however.
963 */
964 return_desc =
965 *(operand[0]->reference.where);
966 if (return_desc) {
967 acpi_ut_add_reference
968 (return_desc);
969 }
970 break;
971
972 default:
973
974 ACPI_ERROR((AE_INFO,
975 "Unknown Index TargetType %X in obj %p",
976 operand[0]->reference.
977 target_type, operand[0]));
978 status = AE_AML_OPERAND_TYPE;
979 goto cleanup;
980 }
981 break;
982
983 case AML_REF_OF_OP:
984
985 return_desc = operand[0]->reference.object;
986
987 if (ACPI_GET_DESCRIPTOR_TYPE(return_desc) ==
988 ACPI_DESC_TYPE_NAMED) {
989 return_desc =
990 acpi_ns_get_attached_object((struct
991 acpi_namespace_node
992 *)
993 return_desc);
994 }
995
996 /* Add another reference to the object! */
997
998 acpi_ut_add_reference(return_desc);
999 break;
1000
1001 default:
1002 ACPI_ERROR((AE_INFO,
1003 "Unknown opcode in reference(%p) - %X",
1004 operand[0],
1005 operand[0]->reference.opcode));
1006
1007 status = AE_TYPE;
1008 goto cleanup;
1009 }
1010 }
1011 break;
1012
1013 default:
1014
1015 ACPI_ERROR((AE_INFO, "Unknown AML opcode %X",
1016 walk_state->opcode));
1017 status = AE_AML_BAD_OPCODE;
1018 goto cleanup;
1019 }
1020
1021 cleanup:
1022
1023 /* Delete return object on error */
1024
1025 if (ACPI_FAILURE(status)) {
1026 acpi_ut_remove_reference(return_desc);
1027 }
1028
1029 /* Save return object on success */
1030
1031 else {
1032 walk_state->result_obj = return_desc;
1033 }
1034
1035 return_ACPI_STATUS(status);
1036 }
Linux kernel - Deliverables
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