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ACPICA: Additional 2016 copyright changes
[deliverable/linux.git] / drivers / acpi / acpica / psargs.c
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
52 ACPI_MODULE_NAME("psargs")
53
54 /* Local prototypes */
55 static u32
56 acpi_ps_get_next_package_length(struct acpi_parse_state *parser_state);
57
58 static 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
75 static u32
76 acpi_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
127 u8 *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
156 char *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
229 acpi_status
230 acpi_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 (GET_CURRENT_ARG_TYPE(walk_state->arg_types) ==
273 ARGP_SUPERNAME) {
274 /*
275 * acpi_ps_get_next_namestring has increased the AML pointer,
276 * so we need to restore the saved AML pointer for method call.
277 */
278 walk_state->parser_state.aml = start;
279 walk_state->arg_count = 1;
280 acpi_ps_init_op(arg, AML_INT_METHODCALL_OP);
281 return_ACPI_STATUS(AE_OK);
282 }
283
284 /* This name is actually a control method invocation */
285
286 method_desc = acpi_ns_get_attached_object(node);
287 ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
288 "Control Method - %p Desc %p Path=%p\n", node,
289 method_desc, path));
290
291 name_op = acpi_ps_alloc_op(AML_INT_NAMEPATH_OP, start);
292 if (!name_op) {
293 return_ACPI_STATUS(AE_NO_MEMORY);
294 }
295
296 /* Change Arg into a METHOD CALL and attach name to it */
297
298 acpi_ps_init_op(arg, AML_INT_METHODCALL_OP);
299 name_op->common.value.name = path;
300
301 /* Point METHODCALL/NAME to the METHOD Node */
302
303 name_op->common.node = node;
304 acpi_ps_append_arg(arg, name_op);
305
306 if (!method_desc) {
307 ACPI_ERROR((AE_INFO,
308 "Control Method %p has no attached object",
309 node));
310 return_ACPI_STATUS(AE_AML_INTERNAL);
311 }
312
313 ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
314 "Control Method - %p Args %X\n",
315 node, method_desc->method.param_count));
316
317 /* Get the number of arguments to expect */
318
319 walk_state->arg_count = method_desc->method.param_count;
320 return_ACPI_STATUS(AE_OK);
321 }
322
323 /*
324 * Special handling if the name was not found during the lookup -
325 * some not_found cases are allowed
326 */
327 if (status == AE_NOT_FOUND) {
328
329 /* 1) not_found is ok during load pass 1/2 (allow forward references) */
330
331 if ((walk_state->parse_flags & ACPI_PARSE_MODE_MASK) !=
332 ACPI_PARSE_EXECUTE) {
333 status = AE_OK;
334 }
335
336 /* 2) not_found during a cond_ref_of(x) is ok by definition */
337
338 else if (walk_state->op->common.aml_opcode ==
339 AML_COND_REF_OF_OP) {
340 status = AE_OK;
341 }
342
343 /*
344 * 3) not_found while building a Package is ok at this point, we
345 * may flag as an error later if slack mode is not enabled.
346 * (Some ASL code depends on allowing this behavior)
347 */
348 else if ((arg->common.parent) &&
349 ((arg->common.parent->common.aml_opcode ==
350 AML_PACKAGE_OP)
351 || (arg->common.parent->common.aml_opcode ==
352 AML_VAR_PACKAGE_OP))) {
353 status = AE_OK;
354 }
355 }
356
357 /* Final exception check (may have been changed from code above) */
358
359 if (ACPI_FAILURE(status)) {
360 ACPI_ERROR_NAMESPACE(path, status);
361
362 if ((walk_state->parse_flags & ACPI_PARSE_MODE_MASK) ==
363 ACPI_PARSE_EXECUTE) {
364
365 /* Report a control method execution error */
366
367 status = acpi_ds_method_error(status, walk_state);
368 }
369 }
370
371 /* Save the namepath */
372
373 arg->common.value.name = path;
374 return_ACPI_STATUS(status);
375 }
376
377 /*******************************************************************************
378 *
379 * FUNCTION: acpi_ps_get_next_simple_arg
380 *
381 * PARAMETERS: parser_state - Current parser state object
382 * arg_type - The argument type (AML_*_ARG)
383 * arg - Where the argument is returned
384 *
385 * RETURN: None
386 *
387 * DESCRIPTION: Get the next simple argument (constant, string, or namestring)
388 *
389 ******************************************************************************/
390
391 void
392 acpi_ps_get_next_simple_arg(struct acpi_parse_state *parser_state,
393 u32 arg_type, union acpi_parse_object *arg)
394 {
395 u32 length;
396 u16 opcode;
397 u8 *aml = parser_state->aml;
398
399 ACPI_FUNCTION_TRACE_U32(ps_get_next_simple_arg, arg_type);
400
401 switch (arg_type) {
402 case ARGP_BYTEDATA:
403
404 /* Get 1 byte from the AML stream */
405
406 opcode = AML_BYTE_OP;
407 arg->common.value.integer = (u64) *aml;
408 length = 1;
409 break;
410
411 case ARGP_WORDDATA:
412
413 /* Get 2 bytes from the AML stream */
414
415 opcode = AML_WORD_OP;
416 ACPI_MOVE_16_TO_64(&arg->common.value.integer, aml);
417 length = 2;
418 break;
419
420 case ARGP_DWORDDATA:
421
422 /* Get 4 bytes from the AML stream */
423
424 opcode = AML_DWORD_OP;
425 ACPI_MOVE_32_TO_64(&arg->common.value.integer, aml);
426 length = 4;
427 break;
428
429 case ARGP_QWORDDATA:
430
431 /* Get 8 bytes from the AML stream */
432
433 opcode = AML_QWORD_OP;
434 ACPI_MOVE_64_TO_64(&arg->common.value.integer, aml);
435 length = 8;
436 break;
437
438 case ARGP_CHARLIST:
439
440 /* Get a pointer to the string, point past the string */
441
442 opcode = AML_STRING_OP;
443 arg->common.value.string = ACPI_CAST_PTR(char, aml);
444
445 /* Find the null terminator */
446
447 length = 0;
448 while (aml[length]) {
449 length++;
450 }
451 length++;
452 break;
453
454 case ARGP_NAME:
455 case ARGP_NAMESTRING:
456
457 acpi_ps_init_op(arg, AML_INT_NAMEPATH_OP);
458 arg->common.value.name =
459 acpi_ps_get_next_namestring(parser_state);
460 return_VOID;
461
462 default:
463
464 ACPI_ERROR((AE_INFO, "Invalid ArgType 0x%X", arg_type));
465 return_VOID;
466 }
467
468 acpi_ps_init_op(arg, opcode);
469 parser_state->aml += length;
470 return_VOID;
471 }
472
473 /*******************************************************************************
474 *
475 * FUNCTION: acpi_ps_get_next_field
476 *
477 * PARAMETERS: parser_state - Current parser state object
478 *
479 * RETURN: A newly allocated FIELD op
480 *
481 * DESCRIPTION: Get next field (named_field, reserved_field, or access_field)
482 *
483 ******************************************************************************/
484
485 static union acpi_parse_object *acpi_ps_get_next_field(struct acpi_parse_state
486 *parser_state)
487 {
488 u8 *aml;
489 union acpi_parse_object *field;
490 union acpi_parse_object *arg = NULL;
491 u16 opcode;
492 u32 name;
493 u8 access_type;
494 u8 access_attribute;
495 u8 access_length;
496 u32 pkg_length;
497 u8 *pkg_end;
498 u32 buffer_length;
499
500 ACPI_FUNCTION_TRACE(ps_get_next_field);
501
502 aml = parser_state->aml;
503
504 /* Determine field type */
505
506 switch (ACPI_GET8(parser_state->aml)) {
507 case AML_FIELD_OFFSET_OP:
508
509 opcode = AML_INT_RESERVEDFIELD_OP;
510 parser_state->aml++;
511 break;
512
513 case AML_FIELD_ACCESS_OP:
514
515 opcode = AML_INT_ACCESSFIELD_OP;
516 parser_state->aml++;
517 break;
518
519 case AML_FIELD_CONNECTION_OP:
520
521 opcode = AML_INT_CONNECTION_OP;
522 parser_state->aml++;
523 break;
524
525 case AML_FIELD_EXT_ACCESS_OP:
526
527 opcode = AML_INT_EXTACCESSFIELD_OP;
528 parser_state->aml++;
529 break;
530
531 default:
532
533 opcode = AML_INT_NAMEDFIELD_OP;
534 break;
535 }
536
537 /* Allocate a new field op */
538
539 field = acpi_ps_alloc_op(opcode, aml);
540 if (!field) {
541 return_PTR(NULL);
542 }
543
544 /* Decode the field type */
545
546 switch (opcode) {
547 case AML_INT_NAMEDFIELD_OP:
548
549 /* Get the 4-character name */
550
551 ACPI_MOVE_32_TO_32(&name, parser_state->aml);
552 acpi_ps_set_name(field, name);
553 parser_state->aml += ACPI_NAME_SIZE;
554
555 /* Get the length which is encoded as a package length */
556
557 field->common.value.size =
558 acpi_ps_get_next_package_length(parser_state);
559 break;
560
561 case AML_INT_RESERVEDFIELD_OP:
562
563 /* Get the length which is encoded as a package length */
564
565 field->common.value.size =
566 acpi_ps_get_next_package_length(parser_state);
567 break;
568
569 case AML_INT_ACCESSFIELD_OP:
570 case AML_INT_EXTACCESSFIELD_OP:
571
572 /*
573 * Get access_type and access_attrib and merge into the field Op
574 * access_type is first operand, access_attribute is second. stuff
575 * these bytes into the node integer value for convenience.
576 */
577
578 /* Get the two bytes (Type/Attribute) */
579
580 access_type = ACPI_GET8(parser_state->aml);
581 parser_state->aml++;
582 access_attribute = ACPI_GET8(parser_state->aml);
583 parser_state->aml++;
584
585 field->common.value.integer = (u8)access_type;
586 field->common.value.integer |= (u16)(access_attribute << 8);
587
588 /* This opcode has a third byte, access_length */
589
590 if (opcode == AML_INT_EXTACCESSFIELD_OP) {
591 access_length = ACPI_GET8(parser_state->aml);
592 parser_state->aml++;
593
594 field->common.value.integer |=
595 (u32)(access_length << 16);
596 }
597 break;
598
599 case AML_INT_CONNECTION_OP:
600
601 /*
602 * Argument for Connection operator can be either a Buffer
603 * (resource descriptor), or a name_string.
604 */
605 aml = parser_state->aml;
606 if (ACPI_GET8(parser_state->aml) == AML_BUFFER_OP) {
607 parser_state->aml++;
608
609 pkg_end = parser_state->aml;
610 pkg_length =
611 acpi_ps_get_next_package_length(parser_state);
612 pkg_end += pkg_length;
613
614 if (parser_state->aml < pkg_end) {
615
616 /* Non-empty list */
617
618 arg =
619 acpi_ps_alloc_op(AML_INT_BYTELIST_OP, aml);
620 if (!arg) {
621 acpi_ps_free_op(field);
622 return_PTR(NULL);
623 }
624
625 /* Get the actual buffer length argument */
626
627 opcode = ACPI_GET8(parser_state->aml);
628 parser_state->aml++;
629
630 switch (opcode) {
631 case AML_BYTE_OP: /* AML_BYTEDATA_ARG */
632
633 buffer_length =
634 ACPI_GET8(parser_state->aml);
635 parser_state->aml += 1;
636 break;
637
638 case AML_WORD_OP: /* AML_WORDDATA_ARG */
639
640 buffer_length =
641 ACPI_GET16(parser_state->aml);
642 parser_state->aml += 2;
643 break;
644
645 case AML_DWORD_OP: /* AML_DWORDATA_ARG */
646
647 buffer_length =
648 ACPI_GET32(parser_state->aml);
649 parser_state->aml += 4;
650 break;
651
652 default:
653
654 buffer_length = 0;
655 break;
656 }
657
658 /* Fill in bytelist data */
659
660 arg->named.value.size = buffer_length;
661 arg->named.data = parser_state->aml;
662 }
663
664 /* Skip to End of byte data */
665
666 parser_state->aml = pkg_end;
667 } else {
668 arg = acpi_ps_alloc_op(AML_INT_NAMEPATH_OP, aml);
669 if (!arg) {
670 acpi_ps_free_op(field);
671 return_PTR(NULL);
672 }
673
674 /* Get the Namestring argument */
675
676 arg->common.value.name =
677 acpi_ps_get_next_namestring(parser_state);
678 }
679
680 /* Link the buffer/namestring to parent (CONNECTION_OP) */
681
682 acpi_ps_append_arg(field, arg);
683 break;
684
685 default:
686
687 /* Opcode was set in previous switch */
688 break;
689 }
690
691 return_PTR(field);
692 }
693
694 /*******************************************************************************
695 *
696 * FUNCTION: acpi_ps_get_next_arg
697 *
698 * PARAMETERS: walk_state - Current state
699 * parser_state - Current parser state object
700 * arg_type - The parser argument type (ARGP_*)
701 * return_arg - Where the next arg is returned
702 *
703 * RETURN: Status, and an op object containing the next argument.
704 *
705 * DESCRIPTION: Get next argument (including complex list arguments that require
706 * pushing the parser stack)
707 *
708 ******************************************************************************/
709
710 acpi_status
711 acpi_ps_get_next_arg(struct acpi_walk_state *walk_state,
712 struct acpi_parse_state *parser_state,
713 u32 arg_type, union acpi_parse_object **return_arg)
714 {
715 union acpi_parse_object *arg = NULL;
716 union acpi_parse_object *prev = NULL;
717 union acpi_parse_object *field;
718 u32 subop;
719 acpi_status status = AE_OK;
720
721 ACPI_FUNCTION_TRACE_PTR(ps_get_next_arg, parser_state);
722
723 switch (arg_type) {
724 case ARGP_BYTEDATA:
725 case ARGP_WORDDATA:
726 case ARGP_DWORDDATA:
727 case ARGP_CHARLIST:
728 case ARGP_NAME:
729 case ARGP_NAMESTRING:
730
731 /* Constants, strings, and namestrings are all the same size */
732
733 arg = acpi_ps_alloc_op(AML_BYTE_OP, parser_state->aml);
734 if (!arg) {
735 return_ACPI_STATUS(AE_NO_MEMORY);
736 }
737
738 acpi_ps_get_next_simple_arg(parser_state, arg_type, arg);
739 break;
740
741 case ARGP_PKGLENGTH:
742
743 /* Package length, nothing returned */
744
745 parser_state->pkg_end =
746 acpi_ps_get_next_package_end(parser_state);
747 break;
748
749 case ARGP_FIELDLIST:
750
751 if (parser_state->aml < parser_state->pkg_end) {
752
753 /* Non-empty list */
754
755 while (parser_state->aml < parser_state->pkg_end) {
756 field = acpi_ps_get_next_field(parser_state);
757 if (!field) {
758 return_ACPI_STATUS(AE_NO_MEMORY);
759 }
760
761 if (prev) {
762 prev->common.next = field;
763 } else {
764 arg = field;
765 }
766 prev = field;
767 }
768
769 /* Skip to End of byte data */
770
771 parser_state->aml = parser_state->pkg_end;
772 }
773 break;
774
775 case ARGP_BYTELIST:
776
777 if (parser_state->aml < parser_state->pkg_end) {
778
779 /* Non-empty list */
780
781 arg = acpi_ps_alloc_op(AML_INT_BYTELIST_OP,
782 parser_state->aml);
783 if (!arg) {
784 return_ACPI_STATUS(AE_NO_MEMORY);
785 }
786
787 /* Fill in bytelist data */
788
789 arg->common.value.size = (u32)
790 ACPI_PTR_DIFF(parser_state->pkg_end,
791 parser_state->aml);
792 arg->named.data = parser_state->aml;
793
794 /* Skip to End of byte data */
795
796 parser_state->aml = parser_state->pkg_end;
797 }
798 break;
799
800 case ARGP_TARGET:
801 case ARGP_SUPERNAME:
802 case ARGP_SIMPLENAME:
803 case ARGP_NAME_OR_REF:
804
805 subop = acpi_ps_peek_opcode(parser_state);
806 if (subop == 0 ||
807 acpi_ps_is_leading_char(subop) ||
808 ACPI_IS_ROOT_PREFIX(subop) ||
809 ACPI_IS_PARENT_PREFIX(subop)) {
810
811 /* null_name or name_string */
812
813 arg =
814 acpi_ps_alloc_op(AML_INT_NAMEPATH_OP,
815 parser_state->aml);
816 if (!arg) {
817 return_ACPI_STATUS(AE_NO_MEMORY);
818 }
819
820 /* super_name allows argument to be a method call */
821
822 if (arg_type == ARGP_SUPERNAME) {
823 status =
824 acpi_ps_get_next_namepath(walk_state,
825 parser_state, arg,
826 ACPI_POSSIBLE_METHOD_CALL);
827
828 /*
829 * If the super_name argument is a method call, we have
830 * already restored the AML pointer, just free this Arg
831 */
832 if (arg->common.aml_opcode ==
833 AML_INT_METHODCALL_OP) {
834 acpi_ps_free_op(arg);
835 arg = NULL;
836 }
837 } else {
838 status =
839 acpi_ps_get_next_namepath(walk_state,
840 parser_state, arg,
841 ACPI_NOT_METHOD_CALL);
842 }
843 } else {
844 /* Single complex argument, nothing returned */
845
846 walk_state->arg_count = 1;
847 }
848 break;
849
850 case ARGP_DATAOBJ:
851 case ARGP_TERMARG:
852
853 /* Single complex argument, nothing returned */
854
855 walk_state->arg_count = 1;
856 break;
857
858 case ARGP_DATAOBJLIST:
859 case ARGP_TERMLIST:
860 case ARGP_OBJLIST:
861
862 if (parser_state->aml < parser_state->pkg_end) {
863
864 /* Non-empty list of variable arguments, nothing returned */
865
866 walk_state->arg_count = ACPI_VAR_ARGS;
867 }
868 break;
869
870 default:
871
872 ACPI_ERROR((AE_INFO, "Invalid ArgType: 0x%X", arg_type));
873 status = AE_AML_OPERAND_TYPE;
874 break;
875 }
876
877 *return_arg = arg;
878 return_ACPI_STATUS(status);
879 }
Linux kernel - Deliverables
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