Loading...
1/******************************************************************************
2 *
3 * Module Name: psargs - Parse AML opcode arguments
4 *
5 *****************************************************************************/
6
7/*
8 * Copyright (C) 2000 - 2011, Intel Corp.
9 * All rights reserved.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions, and the following disclaimer,
16 * without modification.
17 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
18 * substantially similar to the "NO WARRANTY" disclaimer below
19 * ("Disclaimer") and any redistribution must be conditioned upon
20 * including a substantially similar Disclaimer requirement for further
21 * binary redistribution.
22 * 3. Neither the names of the above-listed copyright holders nor the names
23 * of any contributors may be used to endorse or promote products derived
24 * from this software without specific prior written permission.
25 *
26 * Alternatively, this software may be distributed under the terms of the
27 * GNU General Public License ("GPL") version 2 as published by the Free
28 * Software Foundation.
29 *
30 * NO WARRANTY
31 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
32 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
33 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
34 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
35 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
36 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
37 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
38 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
39 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
40 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
41 * POSSIBILITY OF SUCH DAMAGES.
42 */
43
44#include <acpi/acpi.h>
45#include "accommon.h"
46#include "acparser.h"
47#include "amlcode.h"
48#include "acnamesp.h"
49#include "acdispat.h"
50
51#define _COMPONENT ACPI_PARSER
52ACPI_MODULE_NAME("psargs")
53
54/* Local prototypes */
55static u32
56acpi_ps_get_next_package_length(struct acpi_parse_state *parser_state);
57
58static union acpi_parse_object *acpi_ps_get_next_field(struct acpi_parse_state
59 *parser_state);
60
61/*******************************************************************************
62 *
63 * FUNCTION: acpi_ps_get_next_package_length
64 *
65 * PARAMETERS: parser_state - Current parser state object
66 *
67 * RETURN: Decoded package length. On completion, the AML pointer points
68 * past the length byte or bytes.
69 *
70 * DESCRIPTION: Decode and return a package length field.
71 * Note: Largest package length is 28 bits, from ACPI specification
72 *
73 ******************************************************************************/
74
75static u32
76acpi_ps_get_next_package_length(struct acpi_parse_state *parser_state)
77{
78 u8 *aml = parser_state->aml;
79 u32 package_length = 0;
80 u32 byte_count;
81 u8 byte_zero_mask = 0x3F; /* Default [0:5] */
82
83 ACPI_FUNCTION_TRACE(ps_get_next_package_length);
84
85 /*
86 * Byte 0 bits [6:7] contain the number of additional bytes
87 * used to encode the package length, either 0,1,2, or 3
88 */
89 byte_count = (aml[0] >> 6);
90 parser_state->aml += ((acpi_size) byte_count + 1);
91
92 /* Get bytes 3, 2, 1 as needed */
93
94 while (byte_count) {
95 /*
96 * Final bit positions for the package length bytes:
97 * Byte3->[20:27]
98 * Byte2->[12:19]
99 * Byte1->[04:11]
100 * Byte0->[00:03]
101 */
102 package_length |= (aml[byte_count] << ((byte_count << 3) - 4));
103
104 byte_zero_mask = 0x0F; /* Use bits [0:3] of byte 0 */
105 byte_count--;
106 }
107
108 /* Byte 0 is a special case, either bits [0:3] or [0:5] are used */
109
110 package_length |= (aml[0] & byte_zero_mask);
111 return_UINT32(package_length);
112}
113
114/*******************************************************************************
115 *
116 * FUNCTION: acpi_ps_get_next_package_end
117 *
118 * PARAMETERS: parser_state - Current parser state object
119 *
120 * RETURN: Pointer to end-of-package +1
121 *
122 * DESCRIPTION: Get next package length and return a pointer past the end of
123 * the package. Consumes the package length field
124 *
125 ******************************************************************************/
126
127u8 *acpi_ps_get_next_package_end(struct acpi_parse_state *parser_state)
128{
129 u8 *start = parser_state->aml;
130 u32 package_length;
131
132 ACPI_FUNCTION_TRACE(ps_get_next_package_end);
133
134 /* Function below updates parser_state->Aml */
135
136 package_length = acpi_ps_get_next_package_length(parser_state);
137
138 return_PTR(start + package_length); /* end of package */
139}
140
141/*******************************************************************************
142 *
143 * FUNCTION: acpi_ps_get_next_namestring
144 *
145 * PARAMETERS: parser_state - Current parser state object
146 *
147 * RETURN: Pointer to the start of the name string (pointer points into
148 * the AML.
149 *
150 * DESCRIPTION: Get next raw namestring within the AML stream. Handles all name
151 * prefix characters. Set parser state to point past the string.
152 * (Name is consumed from the AML.)
153 *
154 ******************************************************************************/
155
156char *acpi_ps_get_next_namestring(struct acpi_parse_state *parser_state)
157{
158 u8 *start = parser_state->aml;
159 u8 *end = parser_state->aml;
160
161 ACPI_FUNCTION_TRACE(ps_get_next_namestring);
162
163 /* Point past any namestring prefix characters (backslash or carat) */
164
165 while (acpi_ps_is_prefix_char(*end)) {
166 end++;
167 }
168
169 /* Decode the path prefix character */
170
171 switch (*end) {
172 case 0:
173
174 /* null_name */
175
176 if (end == start) {
177 start = NULL;
178 }
179 end++;
180 break;
181
182 case AML_DUAL_NAME_PREFIX:
183
184 /* Two name segments */
185
186 end += 1 + (2 * ACPI_NAME_SIZE);
187 break;
188
189 case AML_MULTI_NAME_PREFIX_OP:
190
191 /* Multiple name segments, 4 chars each, count in next byte */
192
193 end += 2 + (*(end + 1) * ACPI_NAME_SIZE);
194 break;
195
196 default:
197
198 /* Single name segment */
199
200 end += ACPI_NAME_SIZE;
201 break;
202 }
203
204 parser_state->aml = end;
205 return_PTR((char *)start);
206}
207
208/*******************************************************************************
209 *
210 * FUNCTION: acpi_ps_get_next_namepath
211 *
212 * PARAMETERS: parser_state - Current parser state object
213 * Arg - Where the namepath will be stored
214 * arg_count - If the namepath points to a control method
215 * the method's argument is returned here.
216 * possible_method_call - Whether the namepath can possibly be the
217 * start of a method call
218 *
219 * RETURN: Status
220 *
221 * DESCRIPTION: Get next name (if method call, return # of required args).
222 * Names are looked up in the internal namespace to determine
223 * if the name represents a control method. If a method
224 * is found, the number of arguments to the method is returned.
225 * This information is critical for parsing to continue correctly.
226 *
227 ******************************************************************************/
228
229acpi_status
230acpi_ps_get_next_namepath(struct acpi_walk_state *walk_state,
231 struct acpi_parse_state *parser_state,
232 union acpi_parse_object *arg, u8 possible_method_call)
233{
234 acpi_status status;
235 char *path;
236 union acpi_parse_object *name_op;
237 union acpi_operand_object *method_desc;
238 struct acpi_namespace_node *node;
239 u8 *start = parser_state->aml;
240
241 ACPI_FUNCTION_TRACE(ps_get_next_namepath);
242
243 path = acpi_ps_get_next_namestring(parser_state);
244 acpi_ps_init_op(arg, AML_INT_NAMEPATH_OP);
245
246 /* Null path case is allowed, just exit */
247
248 if (!path) {
249 arg->common.value.name = path;
250 return_ACPI_STATUS(AE_OK);
251 }
252
253 /*
254 * Lookup the name in the internal namespace, starting with the current
255 * scope. We don't want to add anything new to the namespace here,
256 * however, so we use MODE_EXECUTE.
257 * Allow searching of the parent tree, but don't open a new scope -
258 * we just want to lookup the object (must be mode EXECUTE to perform
259 * the upsearch)
260 */
261 status = acpi_ns_lookup(walk_state->scope_info, path,
262 ACPI_TYPE_ANY, ACPI_IMODE_EXECUTE,
263 ACPI_NS_SEARCH_PARENT | ACPI_NS_DONT_OPEN_SCOPE,
264 NULL, &node);
265
266 /*
267 * If this name is a control method invocation, we must
268 * setup the method call
269 */
270 if (ACPI_SUCCESS(status) &&
271 possible_method_call && (node->type == ACPI_TYPE_METHOD)) {
272 if (walk_state->opcode == AML_UNLOAD_OP) {
273 /*
274 * acpi_ps_get_next_namestring has increased the AML pointer,
275 * so we need to restore the saved AML pointer for method call.
276 */
277 walk_state->parser_state.aml = start;
278 walk_state->arg_count = 1;
279 acpi_ps_init_op(arg, AML_INT_METHODCALL_OP);
280 return_ACPI_STATUS(AE_OK);
281 }
282
283 /* This name is actually a control method invocation */
284
285 method_desc = acpi_ns_get_attached_object(node);
286 ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
287 "Control Method - %p Desc %p Path=%p\n", node,
288 method_desc, path));
289
290 name_op = acpi_ps_alloc_op(AML_INT_NAMEPATH_OP);
291 if (!name_op) {
292 return_ACPI_STATUS(AE_NO_MEMORY);
293 }
294
295 /* Change Arg into a METHOD CALL and attach name to it */
296
297 acpi_ps_init_op(arg, AML_INT_METHODCALL_OP);
298 name_op->common.value.name = path;
299
300 /* Point METHODCALL/NAME to the METHOD Node */
301
302 name_op->common.node = node;
303 acpi_ps_append_arg(arg, name_op);
304
305 if (!method_desc) {
306 ACPI_ERROR((AE_INFO,
307 "Control Method %p has no attached object",
308 node));
309 return_ACPI_STATUS(AE_AML_INTERNAL);
310 }
311
312 ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
313 "Control Method - %p Args %X\n",
314 node, method_desc->method.param_count));
315
316 /* Get the number of arguments to expect */
317
318 walk_state->arg_count = method_desc->method.param_count;
319 return_ACPI_STATUS(AE_OK);
320 }
321
322 /*
323 * Special handling if the name was not found during the lookup -
324 * some not_found cases are allowed
325 */
326 if (status == AE_NOT_FOUND) {
327
328 /* 1) not_found is ok during load pass 1/2 (allow forward references) */
329
330 if ((walk_state->parse_flags & ACPI_PARSE_MODE_MASK) !=
331 ACPI_PARSE_EXECUTE) {
332 status = AE_OK;
333 }
334
335 /* 2) not_found during a cond_ref_of(x) is ok by definition */
336
337 else if (walk_state->op->common.aml_opcode ==
338 AML_COND_REF_OF_OP) {
339 status = AE_OK;
340 }
341
342 /*
343 * 3) not_found while building a Package is ok at this point, we
344 * may flag as an error later if slack mode is not enabled.
345 * (Some ASL code depends on allowing this behavior)
346 */
347 else if ((arg->common.parent) &&
348 ((arg->common.parent->common.aml_opcode ==
349 AML_PACKAGE_OP)
350 || (arg->common.parent->common.aml_opcode ==
351 AML_VAR_PACKAGE_OP))) {
352 status = AE_OK;
353 }
354 }
355
356 /* Final exception check (may have been changed from code above) */
357
358 if (ACPI_FAILURE(status)) {
359 ACPI_ERROR_NAMESPACE(path, status);
360
361 if ((walk_state->parse_flags & ACPI_PARSE_MODE_MASK) ==
362 ACPI_PARSE_EXECUTE) {
363
364 /* Report a control method execution error */
365
366 status = acpi_ds_method_error(status, walk_state);
367 }
368 }
369
370 /* Save the namepath */
371
372 arg->common.value.name = path;
373 return_ACPI_STATUS(status);
374}
375
376/*******************************************************************************
377 *
378 * FUNCTION: acpi_ps_get_next_simple_arg
379 *
380 * PARAMETERS: parser_state - Current parser state object
381 * arg_type - The argument type (AML_*_ARG)
382 * Arg - Where the argument is returned
383 *
384 * RETURN: None
385 *
386 * DESCRIPTION: Get the next simple argument (constant, string, or namestring)
387 *
388 ******************************************************************************/
389
390void
391acpi_ps_get_next_simple_arg(struct acpi_parse_state *parser_state,
392 u32 arg_type, union acpi_parse_object *arg)
393{
394 u32 length;
395 u16 opcode;
396 u8 *aml = parser_state->aml;
397
398 ACPI_FUNCTION_TRACE_U32(ps_get_next_simple_arg, arg_type);
399
400 switch (arg_type) {
401 case ARGP_BYTEDATA:
402
403 /* Get 1 byte from the AML stream */
404
405 opcode = AML_BYTE_OP;
406 arg->common.value.integer = (u64) *aml;
407 length = 1;
408 break;
409
410 case ARGP_WORDDATA:
411
412 /* Get 2 bytes from the AML stream */
413
414 opcode = AML_WORD_OP;
415 ACPI_MOVE_16_TO_64(&arg->common.value.integer, aml);
416 length = 2;
417 break;
418
419 case ARGP_DWORDDATA:
420
421 /* Get 4 bytes from the AML stream */
422
423 opcode = AML_DWORD_OP;
424 ACPI_MOVE_32_TO_64(&arg->common.value.integer, aml);
425 length = 4;
426 break;
427
428 case ARGP_QWORDDATA:
429
430 /* Get 8 bytes from the AML stream */
431
432 opcode = AML_QWORD_OP;
433 ACPI_MOVE_64_TO_64(&arg->common.value.integer, aml);
434 length = 8;
435 break;
436
437 case ARGP_CHARLIST:
438
439 /* Get a pointer to the string, point past the string */
440
441 opcode = AML_STRING_OP;
442 arg->common.value.string = ACPI_CAST_PTR(char, aml);
443
444 /* Find the null terminator */
445
446 length = 0;
447 while (aml[length]) {
448 length++;
449 }
450 length++;
451 break;
452
453 case ARGP_NAME:
454 case ARGP_NAMESTRING:
455
456 acpi_ps_init_op(arg, AML_INT_NAMEPATH_OP);
457 arg->common.value.name =
458 acpi_ps_get_next_namestring(parser_state);
459 return_VOID;
460
461 default:
462
463 ACPI_ERROR((AE_INFO, "Invalid ArgType 0x%X", arg_type));
464 return_VOID;
465 }
466
467 acpi_ps_init_op(arg, opcode);
468 parser_state->aml += length;
469 return_VOID;
470}
471
472/*******************************************************************************
473 *
474 * FUNCTION: acpi_ps_get_next_field
475 *
476 * PARAMETERS: parser_state - Current parser state object
477 *
478 * RETURN: A newly allocated FIELD op
479 *
480 * DESCRIPTION: Get next field (named_field, reserved_field, or access_field)
481 *
482 ******************************************************************************/
483
484static union acpi_parse_object *acpi_ps_get_next_field(struct acpi_parse_state
485 *parser_state)
486{
487 u32 aml_offset = (u32)
488 ACPI_PTR_DIFF(parser_state->aml,
489 parser_state->aml_start);
490 union acpi_parse_object *field;
491 u16 opcode;
492 u32 name;
493
494 ACPI_FUNCTION_TRACE(ps_get_next_field);
495
496 /* Determine field type */
497
498 switch (ACPI_GET8(parser_state->aml)) {
499 default:
500
501 opcode = AML_INT_NAMEDFIELD_OP;
502 break;
503
504 case 0x00:
505
506 opcode = AML_INT_RESERVEDFIELD_OP;
507 parser_state->aml++;
508 break;
509
510 case 0x01:
511
512 opcode = AML_INT_ACCESSFIELD_OP;
513 parser_state->aml++;
514 break;
515 }
516
517 /* Allocate a new field op */
518
519 field = acpi_ps_alloc_op(opcode);
520 if (!field) {
521 return_PTR(NULL);
522 }
523
524 field->common.aml_offset = aml_offset;
525
526 /* Decode the field type */
527
528 switch (opcode) {
529 case AML_INT_NAMEDFIELD_OP:
530
531 /* Get the 4-character name */
532
533 ACPI_MOVE_32_TO_32(&name, parser_state->aml);
534 acpi_ps_set_name(field, name);
535 parser_state->aml += ACPI_NAME_SIZE;
536
537 /* Get the length which is encoded as a package length */
538
539 field->common.value.size =
540 acpi_ps_get_next_package_length(parser_state);
541 break;
542
543 case AML_INT_RESERVEDFIELD_OP:
544
545 /* Get the length which is encoded as a package length */
546
547 field->common.value.size =
548 acpi_ps_get_next_package_length(parser_state);
549 break;
550
551 case AML_INT_ACCESSFIELD_OP:
552
553 /*
554 * Get access_type and access_attrib and merge into the field Op
555 * access_type is first operand, access_attribute is second
556 */
557 field->common.value.integer =
558 (((u32) ACPI_GET8(parser_state->aml) << 8));
559 parser_state->aml++;
560 field->common.value.integer |= ACPI_GET8(parser_state->aml);
561 parser_state->aml++;
562 break;
563
564 default:
565
566 /* Opcode was set in previous switch */
567 break;
568 }
569
570 return_PTR(field);
571}
572
573/*******************************************************************************
574 *
575 * FUNCTION: acpi_ps_get_next_arg
576 *
577 * PARAMETERS: walk_state - Current state
578 * parser_state - Current parser state object
579 * arg_type - The argument type (AML_*_ARG)
580 * return_arg - Where the next arg is returned
581 *
582 * RETURN: Status, and an op object containing the next argument.
583 *
584 * DESCRIPTION: Get next argument (including complex list arguments that require
585 * pushing the parser stack)
586 *
587 ******************************************************************************/
588
589acpi_status
590acpi_ps_get_next_arg(struct acpi_walk_state *walk_state,
591 struct acpi_parse_state *parser_state,
592 u32 arg_type, union acpi_parse_object **return_arg)
593{
594 union acpi_parse_object *arg = NULL;
595 union acpi_parse_object *prev = NULL;
596 union acpi_parse_object *field;
597 u32 subop;
598 acpi_status status = AE_OK;
599
600 ACPI_FUNCTION_TRACE_PTR(ps_get_next_arg, parser_state);
601
602 switch (arg_type) {
603 case ARGP_BYTEDATA:
604 case ARGP_WORDDATA:
605 case ARGP_DWORDDATA:
606 case ARGP_CHARLIST:
607 case ARGP_NAME:
608 case ARGP_NAMESTRING:
609
610 /* Constants, strings, and namestrings are all the same size */
611
612 arg = acpi_ps_alloc_op(AML_BYTE_OP);
613 if (!arg) {
614 return_ACPI_STATUS(AE_NO_MEMORY);
615 }
616 acpi_ps_get_next_simple_arg(parser_state, arg_type, arg);
617 break;
618
619 case ARGP_PKGLENGTH:
620
621 /* Package length, nothing returned */
622
623 parser_state->pkg_end =
624 acpi_ps_get_next_package_end(parser_state);
625 break;
626
627 case ARGP_FIELDLIST:
628
629 if (parser_state->aml < parser_state->pkg_end) {
630
631 /* Non-empty list */
632
633 while (parser_state->aml < parser_state->pkg_end) {
634 field = acpi_ps_get_next_field(parser_state);
635 if (!field) {
636 return_ACPI_STATUS(AE_NO_MEMORY);
637 }
638
639 if (prev) {
640 prev->common.next = field;
641 } else {
642 arg = field;
643 }
644 prev = field;
645 }
646
647 /* Skip to End of byte data */
648
649 parser_state->aml = parser_state->pkg_end;
650 }
651 break;
652
653 case ARGP_BYTELIST:
654
655 if (parser_state->aml < parser_state->pkg_end) {
656
657 /* Non-empty list */
658
659 arg = acpi_ps_alloc_op(AML_INT_BYTELIST_OP);
660 if (!arg) {
661 return_ACPI_STATUS(AE_NO_MEMORY);
662 }
663
664 /* Fill in bytelist data */
665
666 arg->common.value.size = (u32)
667 ACPI_PTR_DIFF(parser_state->pkg_end,
668 parser_state->aml);
669 arg->named.data = parser_state->aml;
670
671 /* Skip to End of byte data */
672
673 parser_state->aml = parser_state->pkg_end;
674 }
675 break;
676
677 case ARGP_TARGET:
678 case ARGP_SUPERNAME:
679 case ARGP_SIMPLENAME:
680
681 subop = acpi_ps_peek_opcode(parser_state);
682 if (subop == 0 ||
683 acpi_ps_is_leading_char(subop) ||
684 acpi_ps_is_prefix_char(subop)) {
685
686 /* null_name or name_string */
687
688 arg = acpi_ps_alloc_op(AML_INT_NAMEPATH_OP);
689 if (!arg) {
690 return_ACPI_STATUS(AE_NO_MEMORY);
691 }
692
693 /* To support super_name arg of Unload */
694
695 if (walk_state->opcode == AML_UNLOAD_OP) {
696 status =
697 acpi_ps_get_next_namepath(walk_state,
698 parser_state, arg,
699 1);
700
701 /*
702 * If the super_name arg of Unload is a method call,
703 * we have restored the AML pointer, just free this Arg
704 */
705 if (arg->common.aml_opcode ==
706 AML_INT_METHODCALL_OP) {
707 acpi_ps_free_op(arg);
708 arg = NULL;
709 }
710 } else {
711 status =
712 acpi_ps_get_next_namepath(walk_state,
713 parser_state, arg,
714 0);
715 }
716 } else {
717 /* Single complex argument, nothing returned */
718
719 walk_state->arg_count = 1;
720 }
721 break;
722
723 case ARGP_DATAOBJ:
724 case ARGP_TERMARG:
725
726 /* Single complex argument, nothing returned */
727
728 walk_state->arg_count = 1;
729 break;
730
731 case ARGP_DATAOBJLIST:
732 case ARGP_TERMLIST:
733 case ARGP_OBJLIST:
734
735 if (parser_state->aml < parser_state->pkg_end) {
736
737 /* Non-empty list of variable arguments, nothing returned */
738
739 walk_state->arg_count = ACPI_VAR_ARGS;
740 }
741 break;
742
743 default:
744
745 ACPI_ERROR((AE_INFO, "Invalid ArgType: 0x%X", arg_type));
746 status = AE_AML_OPERAND_TYPE;
747 break;
748 }
749
750 *return_arg = arg;
751 return_ACPI_STATUS(status);
752}
1/******************************************************************************
2 *
3 * Module Name: psargs - Parse AML opcode arguments
4 *
5 *****************************************************************************/
6
7/*
8 * Copyright (C) 2000 - 2016, Intel Corp.
9 * All rights reserved.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions, and the following disclaimer,
16 * without modification.
17 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
18 * substantially similar to the "NO WARRANTY" disclaimer below
19 * ("Disclaimer") and any redistribution must be conditioned upon
20 * including a substantially similar Disclaimer requirement for further
21 * binary redistribution.
22 * 3. Neither the names of the above-listed copyright holders nor the names
23 * of any contributors may be used to endorse or promote products derived
24 * from this software without specific prior written permission.
25 *
26 * Alternatively, this software may be distributed under the terms of the
27 * GNU General Public License ("GPL") version 2 as published by the Free
28 * Software Foundation.
29 *
30 * NO WARRANTY
31 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
32 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
33 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
34 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
35 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
36 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
37 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
38 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
39 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
40 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
41 * POSSIBILITY OF SUCH DAMAGES.
42 */
43
44#include <acpi/acpi.h>
45#include "accommon.h"
46#include "acparser.h"
47#include "amlcode.h"
48#include "acnamesp.h"
49#include "acdispat.h"
50
51#define _COMPONENT ACPI_PARSER
52ACPI_MODULE_NAME("psargs")
53
54/* Local prototypes */
55static u32
56acpi_ps_get_next_package_length(struct acpi_parse_state *parser_state);
57
58static union acpi_parse_object *acpi_ps_get_next_field(struct acpi_parse_state
59 *parser_state);
60
61/*******************************************************************************
62 *
63 * FUNCTION: acpi_ps_get_next_package_length
64 *
65 * PARAMETERS: parser_state - Current parser state object
66 *
67 * RETURN: Decoded package length. On completion, the AML pointer points
68 * past the length byte or bytes.
69 *
70 * DESCRIPTION: Decode and return a package length field.
71 * Note: Largest package length is 28 bits, from ACPI specification
72 *
73 ******************************************************************************/
74
75static u32
76acpi_ps_get_next_package_length(struct acpi_parse_state *parser_state)
77{
78 u8 *aml = parser_state->aml;
79 u32 package_length = 0;
80 u32 byte_count;
81 u8 byte_zero_mask = 0x3F; /* Default [0:5] */
82
83 ACPI_FUNCTION_TRACE(ps_get_next_package_length);
84
85 /*
86 * Byte 0 bits [6:7] contain the number of additional bytes
87 * used to encode the package length, either 0,1,2, or 3
88 */
89 byte_count = (aml[0] >> 6);
90 parser_state->aml += ((acpi_size)byte_count + 1);
91
92 /* Get bytes 3, 2, 1 as needed */
93
94 while (byte_count) {
95 /*
96 * Final bit positions for the package length bytes:
97 * Byte3->[20:27]
98 * Byte2->[12:19]
99 * Byte1->[04:11]
100 * Byte0->[00:03]
101 */
102 package_length |= (aml[byte_count] << ((byte_count << 3) - 4));
103
104 byte_zero_mask = 0x0F; /* Use bits [0:3] of byte 0 */
105 byte_count--;
106 }
107
108 /* Byte 0 is a special case, either bits [0:3] or [0:5] are used */
109
110 package_length |= (aml[0] & byte_zero_mask);
111 return_UINT32(package_length);
112}
113
114/*******************************************************************************
115 *
116 * FUNCTION: acpi_ps_get_next_package_end
117 *
118 * PARAMETERS: parser_state - Current parser state object
119 *
120 * RETURN: Pointer to end-of-package +1
121 *
122 * DESCRIPTION: Get next package length and return a pointer past the end of
123 * the package. Consumes the package length field
124 *
125 ******************************************************************************/
126
127u8 *acpi_ps_get_next_package_end(struct acpi_parse_state *parser_state)
128{
129 u8 *start = parser_state->aml;
130 u32 package_length;
131
132 ACPI_FUNCTION_TRACE(ps_get_next_package_end);
133
134 /* Function below updates parser_state->Aml */
135
136 package_length = acpi_ps_get_next_package_length(parser_state);
137
138 return_PTR(start + package_length); /* end of package */
139}
140
141/*******************************************************************************
142 *
143 * FUNCTION: acpi_ps_get_next_namestring
144 *
145 * PARAMETERS: parser_state - Current parser state object
146 *
147 * RETURN: Pointer to the start of the name string (pointer points into
148 * the AML.
149 *
150 * DESCRIPTION: Get next raw namestring within the AML stream. Handles all name
151 * prefix characters. Set parser state to point past the string.
152 * (Name is consumed from the AML.)
153 *
154 ******************************************************************************/
155
156char *acpi_ps_get_next_namestring(struct acpi_parse_state *parser_state)
157{
158 u8 *start = parser_state->aml;
159 u8 *end = parser_state->aml;
160
161 ACPI_FUNCTION_TRACE(ps_get_next_namestring);
162
163 /* Point past any namestring prefix characters (backslash or carat) */
164
165 while (ACPI_IS_ROOT_PREFIX(*end) || ACPI_IS_PARENT_PREFIX(*end)) {
166 end++;
167 }
168
169 /* Decode the path prefix character */
170
171 switch (*end) {
172 case 0:
173
174 /* null_name */
175
176 if (end == start) {
177 start = NULL;
178 }
179 end++;
180 break;
181
182 case AML_DUAL_NAME_PREFIX:
183
184 /* Two name segments */
185
186 end += 1 + (2 * ACPI_NAME_SIZE);
187 break;
188
189 case AML_MULTI_NAME_PREFIX_OP:
190
191 /* Multiple name segments, 4 chars each, count in next byte */
192
193 end += 2 + (*(end + 1) * ACPI_NAME_SIZE);
194 break;
195
196 default:
197
198 /* Single name segment */
199
200 end += ACPI_NAME_SIZE;
201 break;
202 }
203
204 parser_state->aml = end;
205 return_PTR((char *)start);
206}
207
208/*******************************************************************************
209 *
210 * FUNCTION: acpi_ps_get_next_namepath
211 *
212 * PARAMETERS: parser_state - Current parser state object
213 * arg - Where the namepath will be stored
214 * arg_count - If the namepath points to a control method
215 * the method's argument is returned here.
216 * possible_method_call - Whether the namepath can possibly be the
217 * start of a method call
218 *
219 * RETURN: Status
220 *
221 * DESCRIPTION: Get next name (if method call, return # of required args).
222 * Names are looked up in the internal namespace to determine
223 * if the name represents a control method. If a method
224 * is found, the number of arguments to the method is returned.
225 * This information is critical for parsing to continue correctly.
226 *
227 ******************************************************************************/
228
229acpi_status
230acpi_ps_get_next_namepath(struct acpi_walk_state *walk_state,
231 struct acpi_parse_state *parser_state,
232 union acpi_parse_object *arg, u8 possible_method_call)
233{
234 acpi_status status;
235 char *path;
236 union acpi_parse_object *name_op;
237 union acpi_operand_object *method_desc;
238 struct acpi_namespace_node *node;
239 u8 *start = parser_state->aml;
240
241 ACPI_FUNCTION_TRACE(ps_get_next_namepath);
242
243 path = acpi_ps_get_next_namestring(parser_state);
244 acpi_ps_init_op(arg, AML_INT_NAMEPATH_OP);
245
246 /* Null path case is allowed, just exit */
247
248 if (!path) {
249 arg->common.value.name = path;
250 return_ACPI_STATUS(AE_OK);
251 }
252
253 /*
254 * Lookup the name in the internal namespace, starting with the current
255 * scope. We don't want to add anything new to the namespace here,
256 * however, so we use MODE_EXECUTE.
257 * Allow searching of the parent tree, but don't open a new scope -
258 * we just want to lookup the object (must be mode EXECUTE to perform
259 * the upsearch)
260 */
261 status = acpi_ns_lookup(walk_state->scope_info, path,
262 ACPI_TYPE_ANY, ACPI_IMODE_EXECUTE,
263 ACPI_NS_SEARCH_PARENT | ACPI_NS_DONT_OPEN_SCOPE,
264 NULL, &node);
265
266 /*
267 * If this name is a control method invocation, we must
268 * setup the method call
269 */
270 if (ACPI_SUCCESS(status) &&
271 possible_method_call && (node->type == ACPI_TYPE_METHOD)) {
272 if (walk_state->opcode == AML_UNLOAD_OP) {
273 /*
274 * acpi_ps_get_next_namestring has increased the AML pointer,
275 * so we need to restore the saved AML pointer for method call.
276 */
277 walk_state->parser_state.aml = start;
278 walk_state->arg_count = 1;
279 acpi_ps_init_op(arg, AML_INT_METHODCALL_OP);
280 return_ACPI_STATUS(AE_OK);
281 }
282
283 /* This name is actually a control method invocation */
284
285 method_desc = acpi_ns_get_attached_object(node);
286 ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
287 "Control Method - %p Desc %p Path=%p\n", node,
288 method_desc, path));
289
290 name_op = acpi_ps_alloc_op(AML_INT_NAMEPATH_OP, start);
291 if (!name_op) {
292 return_ACPI_STATUS(AE_NO_MEMORY);
293 }
294
295 /* Change Arg into a METHOD CALL and attach name to it */
296
297 acpi_ps_init_op(arg, AML_INT_METHODCALL_OP);
298 name_op->common.value.name = path;
299
300 /* Point METHODCALL/NAME to the METHOD Node */
301
302 name_op->common.node = node;
303 acpi_ps_append_arg(arg, name_op);
304
305 if (!method_desc) {
306 ACPI_ERROR((AE_INFO,
307 "Control Method %p has no attached object",
308 node));
309 return_ACPI_STATUS(AE_AML_INTERNAL);
310 }
311
312 ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
313 "Control Method - %p Args %X\n",
314 node, method_desc->method.param_count));
315
316 /* Get the number of arguments to expect */
317
318 walk_state->arg_count = method_desc->method.param_count;
319 return_ACPI_STATUS(AE_OK);
320 }
321
322 /*
323 * Special handling if the name was not found during the lookup -
324 * some not_found cases are allowed
325 */
326 if (status == AE_NOT_FOUND) {
327
328 /* 1) not_found is ok during load pass 1/2 (allow forward references) */
329
330 if ((walk_state->parse_flags & ACPI_PARSE_MODE_MASK) !=
331 ACPI_PARSE_EXECUTE) {
332 status = AE_OK;
333 }
334
335 /* 2) not_found during a cond_ref_of(x) is ok by definition */
336
337 else if (walk_state->op->common.aml_opcode ==
338 AML_COND_REF_OF_OP) {
339 status = AE_OK;
340 }
341
342 /*
343 * 3) not_found while building a Package is ok at this point, we
344 * may flag as an error later if slack mode is not enabled.
345 * (Some ASL code depends on allowing this behavior)
346 */
347 else if ((arg->common.parent) &&
348 ((arg->common.parent->common.aml_opcode ==
349 AML_PACKAGE_OP)
350 || (arg->common.parent->common.aml_opcode ==
351 AML_VAR_PACKAGE_OP))) {
352 status = AE_OK;
353 }
354 }
355
356 /* Final exception check (may have been changed from code above) */
357
358 if (ACPI_FAILURE(status)) {
359 ACPI_ERROR_NAMESPACE(path, status);
360
361 if ((walk_state->parse_flags & ACPI_PARSE_MODE_MASK) ==
362 ACPI_PARSE_EXECUTE) {
363
364 /* Report a control method execution error */
365
366 status = acpi_ds_method_error(status, walk_state);
367 }
368 }
369
370 /* Save the namepath */
371
372 arg->common.value.name = path;
373 return_ACPI_STATUS(status);
374}
375
376/*******************************************************************************
377 *
378 * FUNCTION: acpi_ps_get_next_simple_arg
379 *
380 * PARAMETERS: parser_state - Current parser state object
381 * arg_type - The argument type (AML_*_ARG)
382 * arg - Where the argument is returned
383 *
384 * RETURN: None
385 *
386 * DESCRIPTION: Get the next simple argument (constant, string, or namestring)
387 *
388 ******************************************************************************/
389
390void
391acpi_ps_get_next_simple_arg(struct acpi_parse_state *parser_state,
392 u32 arg_type, union acpi_parse_object *arg)
393{
394 u32 length;
395 u16 opcode;
396 u8 *aml = parser_state->aml;
397
398 ACPI_FUNCTION_TRACE_U32(ps_get_next_simple_arg, arg_type);
399
400 switch (arg_type) {
401 case ARGP_BYTEDATA:
402
403 /* Get 1 byte from the AML stream */
404
405 opcode = AML_BYTE_OP;
406 arg->common.value.integer = (u64) *aml;
407 length = 1;
408 break;
409
410 case ARGP_WORDDATA:
411
412 /* Get 2 bytes from the AML stream */
413
414 opcode = AML_WORD_OP;
415 ACPI_MOVE_16_TO_64(&arg->common.value.integer, aml);
416 length = 2;
417 break;
418
419 case ARGP_DWORDDATA:
420
421 /* Get 4 bytes from the AML stream */
422
423 opcode = AML_DWORD_OP;
424 ACPI_MOVE_32_TO_64(&arg->common.value.integer, aml);
425 length = 4;
426 break;
427
428 case ARGP_QWORDDATA:
429
430 /* Get 8 bytes from the AML stream */
431
432 opcode = AML_QWORD_OP;
433 ACPI_MOVE_64_TO_64(&arg->common.value.integer, aml);
434 length = 8;
435 break;
436
437 case ARGP_CHARLIST:
438
439 /* Get a pointer to the string, point past the string */
440
441 opcode = AML_STRING_OP;
442 arg->common.value.string = ACPI_CAST_PTR(char, aml);
443
444 /* Find the null terminator */
445
446 length = 0;
447 while (aml[length]) {
448 length++;
449 }
450 length++;
451 break;
452
453 case ARGP_NAME:
454 case ARGP_NAMESTRING:
455
456 acpi_ps_init_op(arg, AML_INT_NAMEPATH_OP);
457 arg->common.value.name =
458 acpi_ps_get_next_namestring(parser_state);
459 return_VOID;
460
461 default:
462
463 ACPI_ERROR((AE_INFO, "Invalid ArgType 0x%X", arg_type));
464 return_VOID;
465 }
466
467 acpi_ps_init_op(arg, opcode);
468 parser_state->aml += length;
469 return_VOID;
470}
471
472/*******************************************************************************
473 *
474 * FUNCTION: acpi_ps_get_next_field
475 *
476 * PARAMETERS: parser_state - Current parser state object
477 *
478 * RETURN: A newly allocated FIELD op
479 *
480 * DESCRIPTION: Get next field (named_field, reserved_field, or access_field)
481 *
482 ******************************************************************************/
483
484static union acpi_parse_object *acpi_ps_get_next_field(struct acpi_parse_state
485 *parser_state)
486{
487 u8 *aml;
488 union acpi_parse_object *field;
489 union acpi_parse_object *arg = NULL;
490 u16 opcode;
491 u32 name;
492 u8 access_type;
493 u8 access_attribute;
494 u8 access_length;
495 u32 pkg_length;
496 u8 *pkg_end;
497 u32 buffer_length;
498
499 ACPI_FUNCTION_TRACE(ps_get_next_field);
500
501 aml = parser_state->aml;
502
503 /* Determine field type */
504
505 switch (ACPI_GET8(parser_state->aml)) {
506 case AML_FIELD_OFFSET_OP:
507
508 opcode = AML_INT_RESERVEDFIELD_OP;
509 parser_state->aml++;
510 break;
511
512 case AML_FIELD_ACCESS_OP:
513
514 opcode = AML_INT_ACCESSFIELD_OP;
515 parser_state->aml++;
516 break;
517
518 case AML_FIELD_CONNECTION_OP:
519
520 opcode = AML_INT_CONNECTION_OP;
521 parser_state->aml++;
522 break;
523
524 case AML_FIELD_EXT_ACCESS_OP:
525
526 opcode = AML_INT_EXTACCESSFIELD_OP;
527 parser_state->aml++;
528 break;
529
530 default:
531
532 opcode = AML_INT_NAMEDFIELD_OP;
533 break;
534 }
535
536 /* Allocate a new field op */
537
538 field = acpi_ps_alloc_op(opcode, aml);
539 if (!field) {
540 return_PTR(NULL);
541 }
542
543 /* Decode the field type */
544
545 switch (opcode) {
546 case AML_INT_NAMEDFIELD_OP:
547
548 /* Get the 4-character name */
549
550 ACPI_MOVE_32_TO_32(&name, parser_state->aml);
551 acpi_ps_set_name(field, name);
552 parser_state->aml += ACPI_NAME_SIZE;
553
554 /* Get the length which is encoded as a package length */
555
556 field->common.value.size =
557 acpi_ps_get_next_package_length(parser_state);
558 break;
559
560 case AML_INT_RESERVEDFIELD_OP:
561
562 /* Get the length which is encoded as a package length */
563
564 field->common.value.size =
565 acpi_ps_get_next_package_length(parser_state);
566 break;
567
568 case AML_INT_ACCESSFIELD_OP:
569 case AML_INT_EXTACCESSFIELD_OP:
570
571 /*
572 * Get access_type and access_attrib and merge into the field Op
573 * access_type is first operand, access_attribute is second. stuff
574 * these bytes into the node integer value for convenience.
575 */
576
577 /* Get the two bytes (Type/Attribute) */
578
579 access_type = ACPI_GET8(parser_state->aml);
580 parser_state->aml++;
581 access_attribute = ACPI_GET8(parser_state->aml);
582 parser_state->aml++;
583
584 field->common.value.integer = (u8)access_type;
585 field->common.value.integer |= (u16)(access_attribute << 8);
586
587 /* This opcode has a third byte, access_length */
588
589 if (opcode == AML_INT_EXTACCESSFIELD_OP) {
590 access_length = ACPI_GET8(parser_state->aml);
591 parser_state->aml++;
592
593 field->common.value.integer |=
594 (u32)(access_length << 16);
595 }
596 break;
597
598 case AML_INT_CONNECTION_OP:
599
600 /*
601 * Argument for Connection operator can be either a Buffer
602 * (resource descriptor), or a name_string.
603 */
604 aml = parser_state->aml;
605 if (ACPI_GET8(parser_state->aml) == AML_BUFFER_OP) {
606 parser_state->aml++;
607
608 pkg_end = parser_state->aml;
609 pkg_length =
610 acpi_ps_get_next_package_length(parser_state);
611 pkg_end += pkg_length;
612
613 if (parser_state->aml < pkg_end) {
614
615 /* Non-empty list */
616
617 arg =
618 acpi_ps_alloc_op(AML_INT_BYTELIST_OP, aml);
619 if (!arg) {
620 acpi_ps_free_op(field);
621 return_PTR(NULL);
622 }
623
624 /* Get the actual buffer length argument */
625
626 opcode = ACPI_GET8(parser_state->aml);
627 parser_state->aml++;
628
629 switch (opcode) {
630 case AML_BYTE_OP: /* AML_BYTEDATA_ARG */
631
632 buffer_length =
633 ACPI_GET8(parser_state->aml);
634 parser_state->aml += 1;
635 break;
636
637 case AML_WORD_OP: /* AML_WORDDATA_ARG */
638
639 buffer_length =
640 ACPI_GET16(parser_state->aml);
641 parser_state->aml += 2;
642 break;
643
644 case AML_DWORD_OP: /* AML_DWORDATA_ARG */
645
646 buffer_length =
647 ACPI_GET32(parser_state->aml);
648 parser_state->aml += 4;
649 break;
650
651 default:
652
653 buffer_length = 0;
654 break;
655 }
656
657 /* Fill in bytelist data */
658
659 arg->named.value.size = buffer_length;
660 arg->named.data = parser_state->aml;
661 }
662
663 /* Skip to End of byte data */
664
665 parser_state->aml = pkg_end;
666 } else {
667 arg = acpi_ps_alloc_op(AML_INT_NAMEPATH_OP, aml);
668 if (!arg) {
669 acpi_ps_free_op(field);
670 return_PTR(NULL);
671 }
672
673 /* Get the Namestring argument */
674
675 arg->common.value.name =
676 acpi_ps_get_next_namestring(parser_state);
677 }
678
679 /* Link the buffer/namestring to parent (CONNECTION_OP) */
680
681 acpi_ps_append_arg(field, arg);
682 break;
683
684 default:
685
686 /* Opcode was set in previous switch */
687 break;
688 }
689
690 return_PTR(field);
691}
692
693/*******************************************************************************
694 *
695 * FUNCTION: acpi_ps_get_next_arg
696 *
697 * PARAMETERS: walk_state - Current state
698 * parser_state - Current parser state object
699 * arg_type - The argument type (AML_*_ARG)
700 * return_arg - Where the next arg is returned
701 *
702 * RETURN: Status, and an op object containing the next argument.
703 *
704 * DESCRIPTION: Get next argument (including complex list arguments that require
705 * pushing the parser stack)
706 *
707 ******************************************************************************/
708
709acpi_status
710acpi_ps_get_next_arg(struct acpi_walk_state *walk_state,
711 struct acpi_parse_state *parser_state,
712 u32 arg_type, union acpi_parse_object **return_arg)
713{
714 union acpi_parse_object *arg = NULL;
715 union acpi_parse_object *prev = NULL;
716 union acpi_parse_object *field;
717 u32 subop;
718 acpi_status status = AE_OK;
719
720 ACPI_FUNCTION_TRACE_PTR(ps_get_next_arg, parser_state);
721
722 switch (arg_type) {
723 case ARGP_BYTEDATA:
724 case ARGP_WORDDATA:
725 case ARGP_DWORDDATA:
726 case ARGP_CHARLIST:
727 case ARGP_NAME:
728 case ARGP_NAMESTRING:
729
730 /* Constants, strings, and namestrings are all the same size */
731
732 arg = acpi_ps_alloc_op(AML_BYTE_OP, parser_state->aml);
733 if (!arg) {
734 return_ACPI_STATUS(AE_NO_MEMORY);
735 }
736
737 acpi_ps_get_next_simple_arg(parser_state, arg_type, arg);
738 break;
739
740 case ARGP_PKGLENGTH:
741
742 /* Package length, nothing returned */
743
744 parser_state->pkg_end =
745 acpi_ps_get_next_package_end(parser_state);
746 break;
747
748 case ARGP_FIELDLIST:
749
750 if (parser_state->aml < parser_state->pkg_end) {
751
752 /* Non-empty list */
753
754 while (parser_state->aml < parser_state->pkg_end) {
755 field = acpi_ps_get_next_field(parser_state);
756 if (!field) {
757 return_ACPI_STATUS(AE_NO_MEMORY);
758 }
759
760 if (prev) {
761 prev->common.next = field;
762 } else {
763 arg = field;
764 }
765 prev = field;
766 }
767
768 /* Skip to End of byte data */
769
770 parser_state->aml = parser_state->pkg_end;
771 }
772 break;
773
774 case ARGP_BYTELIST:
775
776 if (parser_state->aml < parser_state->pkg_end) {
777
778 /* Non-empty list */
779
780 arg = acpi_ps_alloc_op(AML_INT_BYTELIST_OP,
781 parser_state->aml);
782 if (!arg) {
783 return_ACPI_STATUS(AE_NO_MEMORY);
784 }
785
786 /* Fill in bytelist data */
787
788 arg->common.value.size = (u32)
789 ACPI_PTR_DIFF(parser_state->pkg_end,
790 parser_state->aml);
791 arg->named.data = parser_state->aml;
792
793 /* Skip to End of byte data */
794
795 parser_state->aml = parser_state->pkg_end;
796 }
797 break;
798
799 case ARGP_TARGET:
800 case ARGP_SUPERNAME:
801 case ARGP_SIMPLENAME:
802 case ARGP_NAME_OR_REF:
803
804 subop = acpi_ps_peek_opcode(parser_state);
805 if (subop == 0 ||
806 acpi_ps_is_leading_char(subop) ||
807 ACPI_IS_ROOT_PREFIX(subop) ||
808 ACPI_IS_PARENT_PREFIX(subop)) {
809
810 /* null_name or name_string */
811
812 arg =
813 acpi_ps_alloc_op(AML_INT_NAMEPATH_OP,
814 parser_state->aml);
815 if (!arg) {
816 return_ACPI_STATUS(AE_NO_MEMORY);
817 }
818
819 /* To support super_name arg of Unload */
820
821 if (walk_state->opcode == AML_UNLOAD_OP) {
822 status =
823 acpi_ps_get_next_namepath(walk_state,
824 parser_state, arg,
825 ACPI_POSSIBLE_METHOD_CALL);
826
827 /*
828 * If the super_name argument is a method call, we have
829 * already restored the AML pointer, just free this Arg
830 */
831 if (arg->common.aml_opcode ==
832 AML_INT_METHODCALL_OP) {
833 acpi_ps_free_op(arg);
834 arg = NULL;
835 }
836 } else {
837 status =
838 acpi_ps_get_next_namepath(walk_state,
839 parser_state, arg,
840 ACPI_NOT_METHOD_CALL);
841 }
842 } else {
843 /* Single complex argument, nothing returned */
844
845 walk_state->arg_count = 1;
846 }
847 break;
848
849 case ARGP_DATAOBJ:
850 case ARGP_TERMARG:
851
852 /* Single complex argument, nothing returned */
853
854 walk_state->arg_count = 1;
855 break;
856
857 case ARGP_DATAOBJLIST:
858 case ARGP_TERMLIST:
859 case ARGP_OBJLIST:
860
861 if (parser_state->aml < parser_state->pkg_end) {
862
863 /* Non-empty list of variable arguments, nothing returned */
864
865 walk_state->arg_count = ACPI_VAR_ARGS;
866 }
867 break;
868
869 default:
870
871 ACPI_ERROR((AE_INFO, "Invalid ArgType: 0x%X", arg_type));
872 status = AE_AML_OPERAND_TYPE;
873 break;
874 }
875
876 *return_arg = arg;
877 return_ACPI_STATUS(status);
878}