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Merge git://git.kernel.org/pub/scm/linux/kernel/git/sam/kbuild-bugfix
[GitHub/mt8127/android_kernel_alcatel_ttab.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 - 2006, 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 #if ACPI_MACHINE_WIDTH != 16
108 return_desc->integer.value = acpi_os_get_timer();
109 #endif
110 break;
111
112 default: /* Unknown opcode */
113
114 ACPI_ERROR((AE_INFO, "Unknown AML opcode %X",
115 walk_state->opcode));
116 status = AE_AML_BAD_OPCODE;
117 break;
118 }
119
120 cleanup:
121
122 /* Delete return object on error */
123
124 if ((ACPI_FAILURE(status)) || walk_state->result_obj) {
125 acpi_ut_remove_reference(return_desc);
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 = temp32 == 0 ? 0 :
326 (ACPI_INTEGER_BIT_SIZE + 1) - temp32;
327 break;
328
329 case AML_FROM_BCD_OP: /* from_bcd (BCDValue, Result) */
330
331 /*
332 * The 64-bit ACPI integer can hold 16 4-bit BCD characters
333 * (if table is 32-bit, integer can hold 8 BCD characters)
334 * Convert each 4-bit BCD value
335 */
336 power_of_ten = 1;
337 return_desc->integer.value = 0;
338 digit = operand[0]->integer.value;
339
340 /* Convert each BCD digit (each is one nybble wide) */
341
342 for (i = 0;
343 (i < acpi_gbl_integer_nybble_width) && (digit > 0);
344 i++) {
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 /* No conversion performed, add ref to handle return value */
491 acpi_ut_add_reference(return_desc);
492 }
493 break;
494
495 case AML_TO_HEXSTRING_OP: /* to_hex_string (Data, Result) */
496
497 status = acpi_ex_convert_to_string(operand[0], &return_desc,
498 ACPI_EXPLICIT_CONVERT_HEX);
499 if (return_desc == operand[0]) {
500 /* No conversion performed, add ref to handle return value */
501 acpi_ut_add_reference(return_desc);
502 }
503 break;
504
505 case AML_TO_BUFFER_OP: /* to_buffer (Data, Result) */
506
507 status = acpi_ex_convert_to_buffer(operand[0], &return_desc);
508 if (return_desc == operand[0]) {
509 /* No conversion performed, add ref to handle return value */
510 acpi_ut_add_reference(return_desc);
511 }
512 break;
513
514 case AML_TO_INTEGER_OP: /* to_integer (Data, Result) */
515
516 status = acpi_ex_convert_to_integer(operand[0], &return_desc,
517 ACPI_ANY_BASE);
518 if (return_desc == operand[0]) {
519 /* No conversion performed, add ref to handle return value */
520 acpi_ut_add_reference(return_desc);
521 }
522 break;
523
524 case AML_SHIFT_LEFT_BIT_OP: /* shift_left_bit (Source, bit_num) */
525 case AML_SHIFT_RIGHT_BIT_OP: /* shift_right_bit (Source, bit_num) */
526
527 /* These are two obsolete opcodes */
528
529 ACPI_ERROR((AE_INFO,
530 "%s is obsolete and not implemented",
531 acpi_ps_get_opcode_name(walk_state->opcode)));
532 status = AE_SUPPORT;
533 goto cleanup;
534
535 default: /* Unknown opcode */
536
537 ACPI_ERROR((AE_INFO, "Unknown AML opcode %X",
538 walk_state->opcode));
539 status = AE_AML_BAD_OPCODE;
540 goto cleanup;
541 }
542
543 if (ACPI_SUCCESS(status)) {
544 /* Store the return value computed above into the target object */
545
546 status = acpi_ex_store(return_desc, operand[1], walk_state);
547 }
548
549 cleanup:
550
551 if (!walk_state->result_obj) {
552 walk_state->result_obj = return_desc;
553 }
554
555 /* Delete return object on error */
556
557 if (ACPI_FAILURE(status)) {
558 acpi_ut_remove_reference(return_desc);
559 }
560
561 return_ACPI_STATUS(status);
562 }
563
564 /*******************************************************************************
565 *
566 * FUNCTION: acpi_ex_opcode_1A_0T_1R
567 *
568 * PARAMETERS: walk_state - Current state (contains AML opcode)
569 *
570 * RETURN: Status
571 *
572 * DESCRIPTION: Execute opcode with one argument, no target, and a return value
573 *
574 ******************************************************************************/
575
576 acpi_status acpi_ex_opcode_1A_0T_1R(struct acpi_walk_state *walk_state)
577 {
578 union acpi_operand_object **operand = &walk_state->operands[0];
579 union acpi_operand_object *temp_desc;
580 union acpi_operand_object *return_desc = NULL;
581 acpi_status status = AE_OK;
582 u32 type;
583 acpi_integer value;
584
585 ACPI_FUNCTION_TRACE_STR("ex_opcode_1A_0T_1R",
586 acpi_ps_get_opcode_name(walk_state->opcode));
587
588 /* Examine the AML opcode */
589
590 switch (walk_state->opcode) {
591 case AML_LNOT_OP: /* LNot (Operand) */
592
593 return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
594 if (!return_desc) {
595 status = AE_NO_MEMORY;
596 goto cleanup;
597 }
598
599 /*
600 * Set result to ONES (TRUE) if Value == 0. Note:
601 * return_desc->Integer.Value is initially == 0 (FALSE) from above.
602 */
603 if (!operand[0]->integer.value) {
604 return_desc->integer.value = ACPI_INTEGER_MAX;
605 }
606 break;
607
608 case AML_DECREMENT_OP: /* Decrement (Operand) */
609 case AML_INCREMENT_OP: /* Increment (Operand) */
610
611 /*
612 * Create a new integer. Can't just get the base integer and
613 * increment it because it may be an Arg or Field.
614 */
615 return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
616 if (!return_desc) {
617 status = AE_NO_MEMORY;
618 goto cleanup;
619 }
620
621 /*
622 * Since we are expecting a Reference operand, it can be either a
623 * NS Node or an internal object.
624 */
625 temp_desc = operand[0];
626 if (ACPI_GET_DESCRIPTOR_TYPE(temp_desc) ==
627 ACPI_DESC_TYPE_OPERAND) {
628 /* Internal reference object - prevent deletion */
629
630 acpi_ut_add_reference(temp_desc);
631 }
632
633 /*
634 * Convert the Reference operand to an Integer (This removes a
635 * reference on the Operand[0] object)
636 *
637 * NOTE: We use LNOT_OP here in order to force resolution of the
638 * reference operand to an actual integer.
639 */
640 status =
641 acpi_ex_resolve_operands(AML_LNOT_OP, &temp_desc,
642 walk_state);
643 if (ACPI_FAILURE(status)) {
644 ACPI_EXCEPTION((AE_INFO, status,
645 "While resolving operands for [%s]",
646 acpi_ps_get_opcode_name(walk_state->
647 opcode)));
648
649 goto cleanup;
650 }
651
652 /*
653 * temp_desc is now guaranteed to be an Integer object --
654 * Perform the actual increment or decrement
655 */
656 if (walk_state->opcode == AML_INCREMENT_OP) {
657 return_desc->integer.value =
658 temp_desc->integer.value + 1;
659 } else {
660 return_desc->integer.value =
661 temp_desc->integer.value - 1;
662 }
663
664 /* Finished with this Integer object */
665
666 acpi_ut_remove_reference(temp_desc);
667
668 /*
669 * Store the result back (indirectly) through the original
670 * Reference object
671 */
672 status = acpi_ex_store(return_desc, operand[0], walk_state);
673 break;
674
675 case AML_TYPE_OP: /* object_type (source_object) */
676
677 /*
678 * Note: The operand is not resolved at this point because we want to
679 * get the associated object, not its value. For example, we don't
680 * want to resolve a field_unit to its value, we want the actual
681 * field_unit object.
682 */
683
684 /* Get the type of the base object */
685
686 status =
687 acpi_ex_resolve_multiple(walk_state, operand[0], &type,
688 NULL);
689 if (ACPI_FAILURE(status)) {
690 goto cleanup;
691 }
692 /* Allocate a descriptor to hold the type. */
693
694 return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
695 if (!return_desc) {
696 status = AE_NO_MEMORY;
697 goto cleanup;
698 }
699
700 return_desc->integer.value = type;
701 break;
702
703 case AML_SIZE_OF_OP: /* size_of (source_object) */
704
705 /*
706 * Note: The operand is not resolved at this point because we want to
707 * get the associated object, not its value.
708 */
709
710 /* Get the base object */
711
712 status = acpi_ex_resolve_multiple(walk_state,
713 operand[0], &type,
714 &temp_desc);
715 if (ACPI_FAILURE(status)) {
716 goto cleanup;
717 }
718
719 /*
720 * The type of the base object must be integer, buffer, string, or
721 * package. All others are not supported.
722 *
723 * NOTE: Integer is not specifically supported by the ACPI spec,
724 * but is supported implicitly via implicit operand conversion.
725 * rather than bother with conversion, we just use the byte width
726 * global (4 or 8 bytes).
727 */
728 switch (type) {
729 case ACPI_TYPE_INTEGER:
730 value = acpi_gbl_integer_byte_width;
731 break;
732
733 case ACPI_TYPE_BUFFER:
734 value = temp_desc->buffer.length;
735 break;
736
737 case ACPI_TYPE_STRING:
738 value = temp_desc->string.length;
739 break;
740
741 case ACPI_TYPE_PACKAGE:
742 value = temp_desc->package.count;
743 break;
744
745 default:
746 ACPI_ERROR((AE_INFO,
747 "Operand is not Buf/Int/Str/Pkg - found type %s",
748 acpi_ut_get_type_name(type)));
749 status = AE_AML_OPERAND_TYPE;
750 goto cleanup;
751 }
752
753 /*
754 * Now that we have the size of the object, create a result
755 * object to hold the value
756 */
757 return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
758 if (!return_desc) {
759 status = AE_NO_MEMORY;
760 goto cleanup;
761 }
762
763 return_desc->integer.value = value;
764 break;
765
766 case AML_REF_OF_OP: /* ref_of (source_object) */
767
768 status =
769 acpi_ex_get_object_reference(operand[0], &return_desc,
770 walk_state);
771 if (ACPI_FAILURE(status)) {
772 goto cleanup;
773 }
774 break;
775
776 case AML_DEREF_OF_OP: /* deref_of (obj_reference | String) */
777
778 /* Check for a method local or argument, or standalone String */
779
780 if (ACPI_GET_DESCRIPTOR_TYPE(operand[0]) !=
781 ACPI_DESC_TYPE_NAMED) {
782 switch (ACPI_GET_OBJECT_TYPE(operand[0])) {
783 case ACPI_TYPE_LOCAL_REFERENCE:
784 /*
785 * This is a deref_of (local_x | arg_x)
786 *
787 * Must resolve/dereference the local/arg reference first
788 */
789 switch (operand[0]->reference.opcode) {
790 case AML_LOCAL_OP:
791 case AML_ARG_OP:
792
793 /* Set Operand[0] to the value of the local/arg */
794
795 status =
796 acpi_ds_method_data_get_value
797 (operand[0]->reference.opcode,
798 operand[0]->reference.offset,
799 walk_state, &temp_desc);
800 if (ACPI_FAILURE(status)) {
801 goto cleanup;
802 }
803
804 /*
805 * Delete our reference to the input object and
806 * point to the object just retrieved
807 */
808 acpi_ut_remove_reference(operand[0]);
809 operand[0] = temp_desc;
810 break;
811
812 case AML_REF_OF_OP:
813
814 /* Get the object to which the reference refers */
815
816 temp_desc =
817 operand[0]->reference.object;
818 acpi_ut_remove_reference(operand[0]);
819 operand[0] = temp_desc;
820 break;
821
822 default:
823
824 /* Must be an Index op - handled below */
825 break;
826 }
827 break;
828
829 case ACPI_TYPE_STRING:
830
831 /*
832 * This is a deref_of (String). The string is a reference
833 * to a named ACPI object.
834 *
835 * 1) Find the owning Node
836 * 2) Dereference the node to an actual object. Could be a
837 * Field, so we need to resolve the node to a value.
838 */
839 status =
840 acpi_ns_get_node_by_path(operand[0]->string.
841 pointer,
842 walk_state->
843 scope_info->scope.
844 node,
845 ACPI_NS_SEARCH_PARENT,
846 ACPI_CAST_INDIRECT_PTR
847 (struct
848 acpi_namespace_node,
849 &return_desc));
850 if (ACPI_FAILURE(status)) {
851 goto cleanup;
852 }
853
854 status =
855 acpi_ex_resolve_node_to_value
856 (ACPI_CAST_INDIRECT_PTR
857 (struct acpi_namespace_node, &return_desc),
858 walk_state);
859 goto cleanup;
860
861 default:
862
863 status = AE_AML_OPERAND_TYPE;
864 goto cleanup;
865 }
866 }
867
868 /* Operand[0] may have changed from the code above */
869
870 if (ACPI_GET_DESCRIPTOR_TYPE(operand[0]) ==
871 ACPI_DESC_TYPE_NAMED) {
872 /*
873 * This is a deref_of (object_reference)
874 * Get the actual object from the Node (This is the dereference).
875 * This case may only happen when a local_x or arg_x is
876 * dereferenced above.
877 */
878 return_desc = acpi_ns_get_attached_object((struct
879 acpi_namespace_node
880 *)
881 operand[0]);
882 acpi_ut_add_reference(return_desc);
883 } else {
884 /*
885 * This must be a reference object produced by either the
886 * Index() or ref_of() operator
887 */
888 switch (operand[0]->reference.opcode) {
889 case AML_INDEX_OP:
890
891 /*
892 * The target type for the Index operator must be
893 * either a Buffer or a Package
894 */
895 switch (operand[0]->reference.target_type) {
896 case ACPI_TYPE_BUFFER_FIELD:
897
898 temp_desc =
899 operand[0]->reference.object;
900
901 /*
902 * Create a new object that contains one element of the
903 * buffer -- the element pointed to by the index.
904 *
905 * NOTE: index into a buffer is NOT a pointer to a
906 * sub-buffer of the main buffer, it is only a pointer to a
907 * single element (byte) of the buffer!
908 */
909 return_desc =
910 acpi_ut_create_internal_object
911 (ACPI_TYPE_INTEGER);
912 if (!return_desc) {
913 status = AE_NO_MEMORY;
914 goto cleanup;
915 }
916
917 /*
918 * Since we are returning the value of the buffer at the
919 * indexed location, we don't need to add an additional
920 * reference to the buffer itself.
921 */
922 return_desc->integer.value =
923 temp_desc->buffer.
924 pointer[operand[0]->reference.
925 offset];
926 break;
927
928 case ACPI_TYPE_PACKAGE:
929
930 /*
931 * Return the referenced element of the package. We must
932 * add another reference to the referenced object, however.
933 */
934 return_desc =
935 *(operand[0]->reference.where);
936 if (return_desc) {
937 acpi_ut_add_reference
938 (return_desc);
939 }
940
941 break;
942
943 default:
944
945 ACPI_ERROR((AE_INFO,
946 "Unknown Index target_type %X in obj %p",
947 operand[0]->reference.
948 target_type, operand[0]));
949 status = AE_AML_OPERAND_TYPE;
950 goto cleanup;
951 }
952 break;
953
954 case AML_REF_OF_OP:
955
956 return_desc = operand[0]->reference.object;
957
958 if (ACPI_GET_DESCRIPTOR_TYPE(return_desc) ==
959 ACPI_DESC_TYPE_NAMED) {
960
961 return_desc =
962 acpi_ns_get_attached_object((struct
963 acpi_namespace_node
964 *)
965 return_desc);
966 }
967
968 /* Add another reference to the object! */
969
970 acpi_ut_add_reference(return_desc);
971 break;
972
973 default:
974 ACPI_ERROR((AE_INFO,
975 "Unknown opcode in ref(%p) - %X",
976 operand[0],
977 operand[0]->reference.opcode));
978
979 status = AE_TYPE;
980 goto cleanup;
981 }
982 }
983 break;
984
985 default:
986
987 ACPI_ERROR((AE_INFO, "Unknown AML opcode %X",
988 walk_state->opcode));
989 status = AE_AML_BAD_OPCODE;
990 goto cleanup;
991 }
992
993 cleanup:
994
995 /* Delete return object on error */
996
997 if (ACPI_FAILURE(status)) {
998 acpi_ut_remove_reference(return_desc);
999 }
1000
1001 walk_state->result_obj = return_desc;
1002 return_ACPI_STATUS(status);
1003 }
kernel source for telekom puls (alcatel/mediatek)