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hugetlb: make unmap_ref_private multi-size-aware
[zen-stable.git] / drivers / acpi / executer / exoparg1.c
blobf622f9eac8a1a85bfe0bfb4afbed5854b5435609
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/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 walk_state->result_obj = NULL;
125 } else {
126 /* Save the return value */
127
128 walk_state->result_obj = return_desc;
129 }
130
131 return_ACPI_STATUS(status);
132 }
133
134 /*******************************************************************************
135 *
136 * FUNCTION: acpi_ex_opcode_1A_0T_0R
137 *
138 * PARAMETERS: walk_state - Current state (contains AML opcode)
139 *
140 * RETURN: Status
141 *
142 * DESCRIPTION: Execute Type 1 monadic operator with numeric operand on
143 * object stack
144 *
145 ******************************************************************************/
146
147 acpi_status acpi_ex_opcode_1A_0T_0R(struct acpi_walk_state *walk_state)
148 {
149 union acpi_operand_object **operand = &walk_state->operands[0];
150 acpi_status status = AE_OK;
151
152 ACPI_FUNCTION_TRACE_STR(ex_opcode_1A_0T_0R,
153 acpi_ps_get_opcode_name(walk_state->opcode));
154
155 /* Examine the AML opcode */
156
157 switch (walk_state->opcode) {
158 case AML_RELEASE_OP: /* Release (mutex_object) */
159
160 status = acpi_ex_release_mutex(operand[0], walk_state);
161 break;
162
163 case AML_RESET_OP: /* Reset (event_object) */
164
165 status = acpi_ex_system_reset_event(operand[0]);
166 break;
167
168 case AML_SIGNAL_OP: /* Signal (event_object) */
169
170 status = acpi_ex_system_signal_event(operand[0]);
171 break;
172
173 case AML_SLEEP_OP: /* Sleep (msec_time) */
174
175 status = acpi_ex_system_do_suspend(operand[0]->integer.value);
176 break;
177
178 case AML_STALL_OP: /* Stall (usec_time) */
179
180 status =
181 acpi_ex_system_do_stall((u32) operand[0]->integer.value);
182 break;
183
184 case AML_UNLOAD_OP: /* Unload (Handle) */
185
186 status = acpi_ex_unload_table(operand[0]);
187 break;
188
189 default: /* Unknown opcode */
190
191 ACPI_ERROR((AE_INFO, "Unknown AML opcode %X",
192 walk_state->opcode));
193 status = AE_AML_BAD_OPCODE;
194 break;
195 }
196
197 return_ACPI_STATUS(status);
198 }
199
200 /*******************************************************************************
201 *
202 * FUNCTION: acpi_ex_opcode_1A_1T_0R
203 *
204 * PARAMETERS: walk_state - Current state (contains AML opcode)
205 *
206 * RETURN: Status
207 *
208 * DESCRIPTION: Execute opcode with one argument, one target, and no
209 * return value.
210 *
211 ******************************************************************************/
212
213 acpi_status acpi_ex_opcode_1A_1T_0R(struct acpi_walk_state *walk_state)
214 {
215 acpi_status status = AE_OK;
216 union acpi_operand_object **operand = &walk_state->operands[0];
217
218 ACPI_FUNCTION_TRACE_STR(ex_opcode_1A_1T_0R,
219 acpi_ps_get_opcode_name(walk_state->opcode));
220
221 /* Examine the AML opcode */
222
223 switch (walk_state->opcode) {
224 case AML_LOAD_OP:
225
226 status = acpi_ex_load_op(operand[0], operand[1], walk_state);
227 break;
228
229 default: /* Unknown opcode */
230
231 ACPI_ERROR((AE_INFO, "Unknown AML opcode %X",
232 walk_state->opcode));
233 status = AE_AML_BAD_OPCODE;
234 goto cleanup;
235 }
236
237 cleanup:
238
239 return_ACPI_STATUS(status);
240 }
241
242 /*******************************************************************************
243 *
244 * FUNCTION: acpi_ex_opcode_1A_1T_1R
245 *
246 * PARAMETERS: walk_state - Current state (contains AML opcode)
247 *
248 * RETURN: Status
249 *
250 * DESCRIPTION: Execute opcode with one argument, one target, and a
251 * return value.
252 *
253 ******************************************************************************/
254
255 acpi_status acpi_ex_opcode_1A_1T_1R(struct acpi_walk_state *walk_state)
256 {
257 acpi_status status = AE_OK;
258 union acpi_operand_object **operand = &walk_state->operands[0];
259 union acpi_operand_object *return_desc = NULL;
260 union acpi_operand_object *return_desc2 = NULL;
261 u32 temp32;
262 u32 i;
263 acpi_integer power_of_ten;
264 acpi_integer digit;
265
266 ACPI_FUNCTION_TRACE_STR(ex_opcode_1A_1T_1R,
267 acpi_ps_get_opcode_name(walk_state->opcode));
268
269 /* Examine the AML opcode */
270
271 switch (walk_state->opcode) {
272 case AML_BIT_NOT_OP:
273 case AML_FIND_SET_LEFT_BIT_OP:
274 case AML_FIND_SET_RIGHT_BIT_OP:
275 case AML_FROM_BCD_OP:
276 case AML_TO_BCD_OP:
277 case AML_COND_REF_OF_OP:
278
279 /* Create a return object of type Integer for these opcodes */
280
281 return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
282 if (!return_desc) {
283 status = AE_NO_MEMORY;
284 goto cleanup;
285 }
286
287 switch (walk_state->opcode) {
288 case AML_BIT_NOT_OP: /* Not (Operand, Result) */
289
290 return_desc->integer.value = ~operand[0]->integer.value;
291 break;
292
293 case AML_FIND_SET_LEFT_BIT_OP: /* find_set_left_bit (Operand, Result) */
294
295 return_desc->integer.value = operand[0]->integer.value;
296
297 /*
298 * Acpi specification describes Integer type as a little
299 * endian unsigned value, so this boundary condition is valid.
300 */
301 for (temp32 = 0; return_desc->integer.value &&
302 temp32 < ACPI_INTEGER_BIT_SIZE; ++temp32) {
303 return_desc->integer.value >>= 1;
304 }
305
306 return_desc->integer.value = temp32;
307 break;
308
309 case AML_FIND_SET_RIGHT_BIT_OP: /* find_set_right_bit (Operand, Result) */
310
311 return_desc->integer.value = operand[0]->integer.value;
312
313 /*
314 * The Acpi specification describes Integer type as a little
315 * endian unsigned value, so this boundary condition is valid.
316 */
317 for (temp32 = 0; return_desc->integer.value &&
318 temp32 < ACPI_INTEGER_BIT_SIZE; ++temp32) {
319 return_desc->integer.value <<= 1;
320 }
321
322 /* Since the bit position is one-based, subtract from 33 (65) */
323
324 return_desc->integer.value =
325 temp32 ==
326 0 ? 0 : (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
346 /* Get the least significant 4-bit BCD digit */
347
348 temp32 = ((u32) digit) & 0xF;
349
350 /* Check the range of the digit */
351
352 if (temp32 > 9) {
353 ACPI_ERROR((AE_INFO,
354 "BCD digit too large (not decimal): 0x%X",
355 temp32));
356
357 status = AE_AML_NUMERIC_OVERFLOW;
358 goto cleanup;
359 }
360
361 /* Sum the digit into the result with the current power of 10 */
362
363 return_desc->integer.value +=
364 (((acpi_integer) temp32) * power_of_ten);
365
366 /* Shift to next BCD digit */
367
368 digit >>= 4;
369
370 /* Next power of 10 */
371
372 power_of_ten *= 10;
373 }
374 break;
375
376 case AML_TO_BCD_OP: /* to_bcd (Operand, Result) */
377
378 return_desc->integer.value = 0;
379 digit = operand[0]->integer.value;
380
381 /* Each BCD digit is one nybble wide */
382
383 for (i = 0;
384 (i < acpi_gbl_integer_nybble_width) && (digit > 0);
385 i++) {
386 (void)acpi_ut_short_divide(digit, 10, &digit,
387 &temp32);
388
389 /*
390 * Insert the BCD digit that resides in the
391 * remainder from above
392 */
393 return_desc->integer.value |=
394 (((acpi_integer) temp32) << ACPI_MUL_4(i));
395 }
396
397 /* Overflow if there is any data left in Digit */
398
399 if (digit > 0) {
400 ACPI_ERROR((AE_INFO,
401 "Integer too large to convert to BCD: %8.8X%8.8X",
402 ACPI_FORMAT_UINT64(operand[0]->
403 integer.value)));
404 status = AE_AML_NUMERIC_OVERFLOW;
405 goto cleanup;
406 }
407 break;
408
409 case AML_COND_REF_OF_OP: /* cond_ref_of (source_object, Result) */
410
411 /*
412 * This op is a little strange because the internal return value is
413 * different than the return value stored in the result descriptor
414 * (There are really two return values)
415 */
416 if ((struct acpi_namespace_node *)operand[0] ==
417 acpi_gbl_root_node) {
418 /*
419 * This means that the object does not exist in the namespace,
420 * return FALSE
421 */
422 return_desc->integer.value = 0;
423 goto cleanup;
424 }
425
426 /* Get the object reference, store it, and remove our reference */
427
428 status = acpi_ex_get_object_reference(operand[0],
429 &return_desc2,
430 walk_state);
431 if (ACPI_FAILURE(status)) {
432 goto cleanup;
433 }
434
435 status =
436 acpi_ex_store(return_desc2, operand[1], walk_state);
437 acpi_ut_remove_reference(return_desc2);
438
439 /* The object exists in the namespace, return TRUE */
440
441 return_desc->integer.value = ACPI_INTEGER_MAX;
442 goto cleanup;
443
444 default:
445 /* No other opcodes get here */
446 break;
447 }
448 break;
449
450 case AML_STORE_OP: /* Store (Source, Target) */
451
452 /*
453 * A store operand is typically a number, string, buffer or lvalue
454 * Be careful about deleting the source object,
455 * since the object itself may have been stored.
456 */
457 status = acpi_ex_store(operand[0], operand[1], walk_state);
458 if (ACPI_FAILURE(status)) {
459 return_ACPI_STATUS(status);
460 }
461
462 /* It is possible that the Store already produced a return object */
463
464 if (!walk_state->result_obj) {
465 /*
466 * Normally, we would remove a reference on the Operand[0]
467 * parameter; But since it is being used as the internal return
468 * object (meaning we would normally increment it), the two
469 * cancel out, and we simply don't do anything.
470 */
471 walk_state->result_obj = operand[0];
472 walk_state->operands[0] = NULL; /* Prevent deletion */
473 }
474 return_ACPI_STATUS(status);
475
476 /*
477 * ACPI 2.0 Opcodes
478 */
479 case AML_COPY_OP: /* Copy (Source, Target) */
480
481 status =
482 acpi_ut_copy_iobject_to_iobject(operand[0], &return_desc,
483 walk_state);
484 break;
485
486 case AML_TO_DECSTRING_OP: /* to_decimal_string (Data, Result) */
487
488 status = acpi_ex_convert_to_string(operand[0], &return_desc,
489 ACPI_EXPLICIT_CONVERT_DECIMAL);
490 if (return_desc == operand[0]) {
491
492 /* No conversion performed, add ref to handle return value */
493 acpi_ut_add_reference(return_desc);
494 }
495 break;
496
497 case AML_TO_HEXSTRING_OP: /* to_hex_string (Data, Result) */
498
499 status = acpi_ex_convert_to_string(operand[0], &return_desc,
500 ACPI_EXPLICIT_CONVERT_HEX);
501 if (return_desc == operand[0]) {
502
503 /* No conversion performed, add ref to handle return value */
504 acpi_ut_add_reference(return_desc);
505 }
506 break;
507
508 case AML_TO_BUFFER_OP: /* to_buffer (Data, Result) */
509
510 status = acpi_ex_convert_to_buffer(operand[0], &return_desc);
511 if (return_desc == operand[0]) {
512
513 /* No conversion performed, add ref to handle return value */
514 acpi_ut_add_reference(return_desc);
515 }
516 break;
517
518 case AML_TO_INTEGER_OP: /* to_integer (Data, Result) */
519
520 status = acpi_ex_convert_to_integer(operand[0], &return_desc,
521 ACPI_ANY_BASE);
522 if (return_desc == operand[0]) {
523
524 /* No conversion performed, add ref to handle return value */
525 acpi_ut_add_reference(return_desc);
526 }
527 break;
528
529 case AML_SHIFT_LEFT_BIT_OP: /* shift_left_bit (Source, bit_num) */
530 case AML_SHIFT_RIGHT_BIT_OP: /* shift_right_bit (Source, bit_num) */
531
532 /* These are two obsolete opcodes */
533
534 ACPI_ERROR((AE_INFO,
535 "%s is obsolete and not implemented",
536 acpi_ps_get_opcode_name(walk_state->opcode)));
537 status = AE_SUPPORT;
538 goto cleanup;
539
540 default: /* Unknown opcode */
541
542 ACPI_ERROR((AE_INFO, "Unknown AML opcode %X",
543 walk_state->opcode));
544 status = AE_AML_BAD_OPCODE;
545 goto cleanup;
546 }
547
548 if (ACPI_SUCCESS(status)) {
549
550 /* Store the return value computed above into the target object */
551
552 status = acpi_ex_store(return_desc, operand[1], walk_state);
553 }
554
555 cleanup:
556
557 /* Delete return object on error */
558
559 if (ACPI_FAILURE(status)) {
560 acpi_ut_remove_reference(return_desc);
561 }
562
563 /* Save return object on success */
564
565 else if (!walk_state->result_obj) {
566 walk_state->result_obj = return_desc;
567 }
568
569 return_ACPI_STATUS(status);
570 }
571
572 /*******************************************************************************
573 *
574 * FUNCTION: acpi_ex_opcode_1A_0T_1R
575 *
576 * PARAMETERS: walk_state - Current state (contains AML opcode)
577 *
578 * RETURN: Status
579 *
580 * DESCRIPTION: Execute opcode with one argument, no target, and a return value
581 *
582 ******************************************************************************/
583
584 acpi_status acpi_ex_opcode_1A_0T_1R(struct acpi_walk_state *walk_state)
585 {
586 union acpi_operand_object **operand = &walk_state->operands[0];
587 union acpi_operand_object *temp_desc;
588 union acpi_operand_object *return_desc = NULL;
589 acpi_status status = AE_OK;
590 u32 type;
591 acpi_integer value;
592
593 ACPI_FUNCTION_TRACE_STR(ex_opcode_1A_0T_1R,
594 acpi_ps_get_opcode_name(walk_state->opcode));
595
596 /* Examine the AML opcode */
597
598 switch (walk_state->opcode) {
599 case AML_LNOT_OP: /* LNot (Operand) */
600
601 return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
602 if (!return_desc) {
603 status = AE_NO_MEMORY;
604 goto cleanup;
605 }
606
607 /*
608 * Set result to ONES (TRUE) if Value == 0. Note:
609 * return_desc->Integer.Value is initially == 0 (FALSE) from above.
610 */
611 if (!operand[0]->integer.value) {
612 return_desc->integer.value = ACPI_INTEGER_MAX;
613 }
614 break;
615
616 case AML_DECREMENT_OP: /* Decrement (Operand) */
617 case AML_INCREMENT_OP: /* Increment (Operand) */
618
619 /*
620 * Create a new integer. Can't just get the base integer and
621 * increment it because it may be an Arg or Field.
622 */
623 return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
624 if (!return_desc) {
625 status = AE_NO_MEMORY;
626 goto cleanup;
627 }
628
629 /*
630 * Since we are expecting a Reference operand, it can be either a
631 * NS Node or an internal object.
632 */
633 temp_desc = operand[0];
634 if (ACPI_GET_DESCRIPTOR_TYPE(temp_desc) ==
635 ACPI_DESC_TYPE_OPERAND) {
636
637 /* Internal reference object - prevent deletion */
638
639 acpi_ut_add_reference(temp_desc);
640 }
641
642 /*
643 * Convert the Reference operand to an Integer (This removes a
644 * reference on the Operand[0] object)
645 *
646 * NOTE: We use LNOT_OP here in order to force resolution of the
647 * reference operand to an actual integer.
648 */
649 status =
650 acpi_ex_resolve_operands(AML_LNOT_OP, &temp_desc,
651 walk_state);
652 if (ACPI_FAILURE(status)) {
653 ACPI_EXCEPTION((AE_INFO, status,
654 "While resolving operands for [%s]",
655 acpi_ps_get_opcode_name(walk_state->
656 opcode)));
657
658 goto cleanup;
659 }
660
661 /*
662 * temp_desc is now guaranteed to be an Integer object --
663 * Perform the actual increment or decrement
664 */
665 if (walk_state->opcode == AML_INCREMENT_OP) {
666 return_desc->integer.value =
667 temp_desc->integer.value + 1;
668 } else {
669 return_desc->integer.value =
670 temp_desc->integer.value - 1;
671 }
672
673 /* Finished with this Integer object */
674
675 acpi_ut_remove_reference(temp_desc);
676
677 /*
678 * Store the result back (indirectly) through the original
679 * Reference object
680 */
681 status = acpi_ex_store(return_desc, operand[0], walk_state);
682 break;
683
684 case AML_TYPE_OP: /* object_type (source_object) */
685
686 /*
687 * Note: The operand is not resolved at this point because we want to
688 * get the associated object, not its value. For example, we don't
689 * want to resolve a field_unit to its value, we want the actual
690 * field_unit object.
691 */
692
693 /* Get the type of the base object */
694
695 status =
696 acpi_ex_resolve_multiple(walk_state, operand[0], &type,
697 NULL);
698 if (ACPI_FAILURE(status)) {
699 goto cleanup;
700 }
701
702 /* Allocate a descriptor to hold the type. */
703
704 return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
705 if (!return_desc) {
706 status = AE_NO_MEMORY;
707 goto cleanup;
708 }
709
710 return_desc->integer.value = type;
711 break;
712
713 case AML_SIZE_OF_OP: /* size_of (source_object) */
714
715 /*
716 * Note: The operand is not resolved at this point because we want to
717 * get the associated object, not its value.
718 */
719
720 /* Get the base object */
721
722 status = acpi_ex_resolve_multiple(walk_state,
723 operand[0], &type,
724 &temp_desc);
725 if (ACPI_FAILURE(status)) {
726 goto cleanup;
727 }
728
729 /*
730 * The type of the base object must be integer, buffer, string, or
731 * package. All others are not supported.
732 *
733 * NOTE: Integer is not specifically supported by the ACPI spec,
734 * but is supported implicitly via implicit operand conversion.
735 * rather than bother with conversion, we just use the byte width
736 * global (4 or 8 bytes).
737 */
738 switch (type) {
739 case ACPI_TYPE_INTEGER:
740 value = acpi_gbl_integer_byte_width;
741 break;
742
743 case ACPI_TYPE_STRING:
744 value = temp_desc->string.length;
745 break;
746
747 case ACPI_TYPE_BUFFER:
748
749 /* Buffer arguments may not be evaluated at this point */
750
751 status = acpi_ds_get_buffer_arguments(temp_desc);
752 value = temp_desc->buffer.length;
753 break;
754
755 case ACPI_TYPE_PACKAGE:
756
757 /* Package arguments may not be evaluated at this point */
758
759 status = acpi_ds_get_package_arguments(temp_desc);
760 value = temp_desc->package.count;
761 break;
762
763 default:
764 ACPI_ERROR((AE_INFO,
765 "Operand must be Buffer/Integer/String/Package - found type %s",
766 acpi_ut_get_type_name(type)));
767 status = AE_AML_OPERAND_TYPE;
768 goto cleanup;
769 }
770
771 if (ACPI_FAILURE(status)) {
772 goto cleanup;
773 }
774
775 /*
776 * Now that we have the size of the object, create a result
777 * object to hold the value
778 */
779 return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
780 if (!return_desc) {
781 status = AE_NO_MEMORY;
782 goto cleanup;
783 }
784
785 return_desc->integer.value = value;
786 break;
787
788 case AML_REF_OF_OP: /* ref_of (source_object) */
789
790 status =
791 acpi_ex_get_object_reference(operand[0], &return_desc,
792 walk_state);
793 if (ACPI_FAILURE(status)) {
794 goto cleanup;
795 }
796 break;
797
798 case AML_DEREF_OF_OP: /* deref_of (obj_reference | String) */
799
800 /* Check for a method local or argument, or standalone String */
801
802 if (ACPI_GET_DESCRIPTOR_TYPE(operand[0]) ==
803 ACPI_DESC_TYPE_NAMED) {
804 temp_desc =
805 acpi_ns_get_attached_object((struct
806 acpi_namespace_node *)
807 operand[0]);
808 if (temp_desc
809 &&
810 ((ACPI_GET_OBJECT_TYPE(temp_desc) ==
811 ACPI_TYPE_STRING)
812 || (ACPI_GET_OBJECT_TYPE(temp_desc) ==
813 ACPI_TYPE_LOCAL_REFERENCE))) {
814 operand[0] = temp_desc;
815 acpi_ut_add_reference(temp_desc);
816 } else {
817 status = AE_AML_OPERAND_TYPE;
818 goto cleanup;
819 }
820 } else {
821 switch (ACPI_GET_OBJECT_TYPE(operand[0])) {
822 case ACPI_TYPE_LOCAL_REFERENCE:
823 /*
824 * This is a deref_of (local_x | arg_x)
825 *
826 * Must resolve/dereference the local/arg reference first
827 */
828 switch (operand[0]->reference.class) {
829 case ACPI_REFCLASS_LOCAL:
830 case ACPI_REFCLASS_ARG:
831
832 /* Set Operand[0] to the value of the local/arg */
833
834 status =
835 acpi_ds_method_data_get_value
836 (operand[0]->reference.class,
837 operand[0]->reference.value,
838 walk_state, &temp_desc);
839 if (ACPI_FAILURE(status)) {
840 goto cleanup;
841 }
842
843 /*
844 * Delete our reference to the input object and
845 * point to the object just retrieved
846 */
847 acpi_ut_remove_reference(operand[0]);
848 operand[0] = temp_desc;
849 break;
850
851 case ACPI_REFCLASS_REFOF:
852
853 /* Get the object to which the reference refers */
854
855 temp_desc =
856 operand[0]->reference.object;
857 acpi_ut_remove_reference(operand[0]);
858 operand[0] = temp_desc;
859 break;
860
861 default:
862
863 /* Must be an Index op - handled below */
864 break;
865 }
866 break;
867
868 case ACPI_TYPE_STRING:
869 break;
870
871 default:
872 status = AE_AML_OPERAND_TYPE;
873 goto cleanup;
874 }
875 }
876
877 if (ACPI_GET_DESCRIPTOR_TYPE(operand[0]) !=
878 ACPI_DESC_TYPE_NAMED) {
879 if (ACPI_GET_OBJECT_TYPE(operand[0]) ==
880 ACPI_TYPE_STRING) {
881 /*
882 * This is a deref_of (String). The string is a reference
883 * to a named ACPI object.
884 *
885 * 1) Find the owning Node
886 * 2) Dereference the node to an actual object. Could be a
887 * Field, so we need to resolve the node to a value.
888 */
889 status =
890 acpi_ns_get_node(walk_state->scope_info->
891 scope.node,
892 operand[0]->string.pointer,
893 ACPI_NS_SEARCH_PARENT,
894 ACPI_CAST_INDIRECT_PTR
895 (struct
896 acpi_namespace_node,
897 &return_desc));
898 if (ACPI_FAILURE(status)) {
899 goto cleanup;
900 }
901
902 status =
903 acpi_ex_resolve_node_to_value
904 (ACPI_CAST_INDIRECT_PTR
905 (struct acpi_namespace_node, &return_desc),
906 walk_state);
907 goto cleanup;
908 }
909 }
910
911 /* Operand[0] may have changed from the code above */
912
913 if (ACPI_GET_DESCRIPTOR_TYPE(operand[0]) ==
914 ACPI_DESC_TYPE_NAMED) {
915 /*
916 * This is a deref_of (object_reference)
917 * Get the actual object from the Node (This is the dereference).
918 * This case may only happen when a local_x or arg_x is
919 * dereferenced above.
920 */
921 return_desc = acpi_ns_get_attached_object((struct
922 acpi_namespace_node
923 *)
924 operand[0]);
925 acpi_ut_add_reference(return_desc);
926 } else {
927 /*
928 * This must be a reference object produced by either the
929 * Index() or ref_of() operator
930 */
931 switch (operand[0]->reference.class) {
932 case ACPI_REFCLASS_INDEX:
933
934 /*
935 * The target type for the Index operator must be
936 * either a Buffer or a Package
937 */
938 switch (operand[0]->reference.target_type) {
939 case ACPI_TYPE_BUFFER_FIELD:
940
941 temp_desc =
942 operand[0]->reference.object;
943
944 /*
945 * Create a new object that contains one element of the
946 * buffer -- the element pointed to by the index.
947 *
948 * NOTE: index into a buffer is NOT a pointer to a
949 * sub-buffer of the main buffer, it is only a pointer to a
950 * single element (byte) of the buffer!
951 */
952 return_desc =
953 acpi_ut_create_internal_object
954 (ACPI_TYPE_INTEGER);
955 if (!return_desc) {
956 status = AE_NO_MEMORY;
957 goto cleanup;
958 }
959
960 /*
961 * Since we are returning the value of the buffer at the
962 * indexed location, we don't need to add an additional
963 * reference to the buffer itself.
964 */
965 return_desc->integer.value =
966 temp_desc->buffer.
967 pointer[operand[0]->reference.
968 value];
969 break;
970
971 case ACPI_TYPE_PACKAGE:
972
973 /*
974 * Return the referenced element of the package. We must
975 * add another reference to the referenced object, however.
976 */
977 return_desc =
978 *(operand[0]->reference.where);
979 if (return_desc) {
980 acpi_ut_add_reference
981 (return_desc);
982 }
983 break;
984
985 default:
986
987 ACPI_ERROR((AE_INFO,
988 "Unknown Index TargetType %X in reference object %p",
989 operand[0]->reference.
990 target_type, operand[0]));
991 status = AE_AML_OPERAND_TYPE;
992 goto cleanup;
993 }
994 break;
995
996 case ACPI_REFCLASS_REFOF:
997
998 return_desc = operand[0]->reference.object;
999
1000 if (ACPI_GET_DESCRIPTOR_TYPE(return_desc) ==
1001 ACPI_DESC_TYPE_NAMED) {
1002 return_desc =
1003 acpi_ns_get_attached_object((struct
1004 acpi_namespace_node
1005 *)
1006 return_desc);
1007 }
1008
1009 /* Add another reference to the object! */
1010
1011 acpi_ut_add_reference(return_desc);
1012 break;
1013
1014 default:
1015 ACPI_ERROR((AE_INFO,
1016 "Unknown class in reference(%p) - %2.2X",
1017 operand[0],
1018 operand[0]->reference.class));
1019
1020 status = AE_TYPE;
1021 goto cleanup;
1022 }
1023 }
1024 break;
1025
1026 default:
1027
1028 ACPI_ERROR((AE_INFO, "Unknown AML opcode %X",
1029 walk_state->opcode));
1030 status = AE_AML_BAD_OPCODE;
1031 goto cleanup;
1032 }
1033
1034 cleanup:
1035
1036 /* Delete return object on error */
1037
1038 if (ACPI_FAILURE(status)) {
1039 acpi_ut_remove_reference(return_desc);
1040 }
1041
1042 /* Save return object on success */
1043
1044 else {
1045 walk_state->result_obj = return_desc;
1046 }
1047
1048 return_ACPI_STATUS(status);
1049 }