1 /******************************************************************************
3 * Module Name: psloop - Main AML parse loop
5 *****************************************************************************/
8 * Copyright (C) 2000 - 2008, Intel Corp.
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
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.
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.
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.
45 * Parse the AML and build an operation tree as most interpreters, (such as
46 * Perl) do. Parsing is done by hand rather than with a YACC generated parser
47 * to tightly constrain stack and dynamic memory usage. Parsing is kept
48 * flexible and the code fairly compact by parsing based on a list of AML
49 * opcode templates in aml_op_info[].
52 #include <acpi/acpi.h>
53 #include <acpi/acparser.h>
54 #include <acpi/acdispat.h>
55 #include <acpi/amlcode.h>
57 #define _COMPONENT ACPI_PARSER
58 ACPI_MODULE_NAME("psloop")
60 static u32 acpi_gbl_depth
= 0;
62 /* Local prototypes */
64 static acpi_status
acpi_ps_get_aml_opcode(struct acpi_walk_state
*walk_state
);
67 acpi_ps_build_named_op(struct acpi_walk_state
*walk_state
,
69 union acpi_parse_object
*unnamed_op
,
70 union acpi_parse_object
**op
);
73 acpi_ps_create_op(struct acpi_walk_state
*walk_state
,
74 u8
* aml_op_start
, union acpi_parse_object
**new_op
);
77 acpi_ps_get_arguments(struct acpi_walk_state
*walk_state
,
78 u8
* aml_op_start
, union acpi_parse_object
*op
);
81 acpi_ps_complete_op(struct acpi_walk_state
*walk_state
,
82 union acpi_parse_object
**op
, acpi_status status
);
85 acpi_ps_complete_final_op(struct acpi_walk_state
*walk_state
,
86 union acpi_parse_object
*op
, acpi_status status
);
88 /*******************************************************************************
90 * FUNCTION: acpi_ps_get_aml_opcode
92 * PARAMETERS: walk_state - Current state
96 * DESCRIPTION: Extract the next AML opcode from the input stream.
98 ******************************************************************************/
100 static acpi_status
acpi_ps_get_aml_opcode(struct acpi_walk_state
*walk_state
)
103 ACPI_FUNCTION_TRACE_PTR(ps_get_aml_opcode
, walk_state
);
105 walk_state
->aml_offset
=
106 (u32
) ACPI_PTR_DIFF(walk_state
->parser_state
.aml
,
107 walk_state
->parser_state
.aml_start
);
108 walk_state
->opcode
= acpi_ps_peek_opcode(&(walk_state
->parser_state
));
111 * First cut to determine what we have found:
112 * 1) A valid AML opcode
114 * 3) An unknown/invalid opcode
116 walk_state
->op_info
= acpi_ps_get_opcode_info(walk_state
->opcode
);
118 switch (walk_state
->op_info
->class) {
119 case AML_CLASS_ASCII
:
120 case AML_CLASS_PREFIX
:
122 * Starts with a valid prefix or ASCII char, this is a name
123 * string. Convert the bare name string to a namepath.
125 walk_state
->opcode
= AML_INT_NAMEPATH_OP
;
126 walk_state
->arg_types
= ARGP_NAMESTRING
;
129 case AML_CLASS_UNKNOWN
:
131 /* The opcode is unrecognized. Just skip unknown opcodes */
134 "Found unknown opcode %X at AML address %p offset %X, ignoring",
135 walk_state
->opcode
, walk_state
->parser_state
.aml
,
136 walk_state
->aml_offset
));
138 ACPI_DUMP_BUFFER(walk_state
->parser_state
.aml
, 128);
140 /* Assume one-byte bad opcode */
142 walk_state
->parser_state
.aml
++;
143 return_ACPI_STATUS(AE_CTRL_PARSE_CONTINUE
);
147 /* Found opcode info, this is a normal opcode */
149 walk_state
->parser_state
.aml
+=
150 acpi_ps_get_opcode_size(walk_state
->opcode
);
151 walk_state
->arg_types
= walk_state
->op_info
->parse_args
;
155 return_ACPI_STATUS(AE_OK
);
158 /*******************************************************************************
160 * FUNCTION: acpi_ps_build_named_op
162 * PARAMETERS: walk_state - Current state
163 * aml_op_start - Begin of named Op in AML
164 * unnamed_op - Early Op (not a named Op)
169 * DESCRIPTION: Parse a named Op
171 ******************************************************************************/
174 acpi_ps_build_named_op(struct acpi_walk_state
*walk_state
,
176 union acpi_parse_object
*unnamed_op
,
177 union acpi_parse_object
**op
)
179 acpi_status status
= AE_OK
;
180 union acpi_parse_object
*arg
= NULL
;
182 ACPI_FUNCTION_TRACE_PTR(ps_build_named_op
, walk_state
);
184 unnamed_op
->common
.value
.arg
= NULL
;
185 unnamed_op
->common
.arg_list_length
= 0;
186 unnamed_op
->common
.aml_opcode
= walk_state
->opcode
;
189 * Get and append arguments until we find the node that contains
190 * the name (the type ARGP_NAME).
192 while (GET_CURRENT_ARG_TYPE(walk_state
->arg_types
) &&
193 (GET_CURRENT_ARG_TYPE(walk_state
->arg_types
) != ARGP_NAME
)) {
195 acpi_ps_get_next_arg(walk_state
,
196 &(walk_state
->parser_state
),
197 GET_CURRENT_ARG_TYPE(walk_state
->
199 if (ACPI_FAILURE(status
)) {
200 return_ACPI_STATUS(status
);
203 acpi_ps_append_arg(unnamed_op
, arg
);
204 INCREMENT_ARG_LIST(walk_state
->arg_types
);
208 * Make sure that we found a NAME and didn't run out of arguments
210 if (!GET_CURRENT_ARG_TYPE(walk_state
->arg_types
)) {
211 return_ACPI_STATUS(AE_AML_NO_OPERAND
);
214 /* We know that this arg is a name, move to next arg */
216 INCREMENT_ARG_LIST(walk_state
->arg_types
);
219 * Find the object. This will either insert the object into
220 * the namespace or simply look it up
222 walk_state
->op
= NULL
;
224 status
= walk_state
->descending_callback(walk_state
, op
);
225 if (ACPI_FAILURE(status
)) {
226 ACPI_EXCEPTION((AE_INFO
, status
, "During name lookup/catalog"));
227 return_ACPI_STATUS(status
);
231 return_ACPI_STATUS(AE_CTRL_PARSE_CONTINUE
);
234 status
= acpi_ps_next_parse_state(walk_state
, *op
, status
);
235 if (ACPI_FAILURE(status
)) {
236 if (status
== AE_CTRL_PENDING
) {
237 return_ACPI_STATUS(AE_CTRL_PARSE_PENDING
);
239 return_ACPI_STATUS(status
);
242 acpi_ps_append_arg(*op
, unnamed_op
->common
.value
.arg
);
245 if ((*op
)->common
.aml_opcode
== AML_REGION_OP
||
246 (*op
)->common
.aml_opcode
== AML_DATA_REGION_OP
) {
248 * Defer final parsing of an operation_region body, because we don't
249 * have enough info in the first pass to parse it correctly (i.e.,
250 * there may be method calls within the term_arg elements of the body.)
252 * However, we must continue parsing because the opregion is not a
253 * standalone package -- we don't know where the end is at this point.
255 * (Length is unknown until parse of the body complete)
257 (*op
)->named
.data
= aml_op_start
;
258 (*op
)->named
.length
= 0;
261 return_ACPI_STATUS(AE_OK
);
264 /*******************************************************************************
266 * FUNCTION: acpi_ps_create_op
268 * PARAMETERS: walk_state - Current state
269 * aml_op_start - Op start in AML
270 * new_op - Returned Op
274 * DESCRIPTION: Get Op from AML
276 ******************************************************************************/
279 acpi_ps_create_op(struct acpi_walk_state
*walk_state
,
280 u8
* aml_op_start
, union acpi_parse_object
**new_op
)
282 acpi_status status
= AE_OK
;
283 union acpi_parse_object
*op
;
284 union acpi_parse_object
*named_op
= NULL
;
285 union acpi_parse_object
*parent_scope
;
287 const struct acpi_opcode_info
*op_info
;
289 ACPI_FUNCTION_TRACE_PTR(ps_create_op
, walk_state
);
291 status
= acpi_ps_get_aml_opcode(walk_state
);
292 if (status
== AE_CTRL_PARSE_CONTINUE
) {
293 return_ACPI_STATUS(AE_CTRL_PARSE_CONTINUE
);
296 /* Create Op structure and append to parent's argument list */
298 walk_state
->op_info
= acpi_ps_get_opcode_info(walk_state
->opcode
);
299 op
= acpi_ps_alloc_op(walk_state
->opcode
);
301 return_ACPI_STATUS(AE_NO_MEMORY
);
304 if (walk_state
->op_info
->flags
& AML_NAMED
) {
306 acpi_ps_build_named_op(walk_state
, aml_op_start
, op
,
309 if (ACPI_FAILURE(status
)) {
310 return_ACPI_STATUS(status
);
314 return_ACPI_STATUS(AE_OK
);
317 /* Not a named opcode, just allocate Op and append to parent */
319 if (walk_state
->op_info
->flags
& AML_CREATE
) {
321 * Backup to beginning of create_xXXfield declaration
322 * body_length is unknown until we parse the body
324 op
->named
.data
= aml_op_start
;
325 op
->named
.length
= 0;
328 if (walk_state
->opcode
== AML_BANK_FIELD_OP
) {
330 * Backup to beginning of bank_field declaration
331 * body_length is unknown until we parse the body
333 op
->named
.data
= aml_op_start
;
334 op
->named
.length
= 0;
337 parent_scope
= acpi_ps_get_parent_scope(&(walk_state
->parser_state
));
338 acpi_ps_append_arg(parent_scope
, op
);
342 acpi_ps_get_opcode_info(parent_scope
->common
.aml_opcode
);
343 if (op_info
->flags
& AML_HAS_TARGET
) {
345 acpi_ps_get_argument_count(op_info
->type
);
346 if (parent_scope
->common
.arg_list_length
>
348 op
->common
.flags
|= ACPI_PARSEOP_TARGET
;
350 } else if (parent_scope
->common
.aml_opcode
== AML_INCREMENT_OP
) {
351 op
->common
.flags
|= ACPI_PARSEOP_TARGET
;
355 if (walk_state
->descending_callback
!= NULL
) {
357 * Find the object. This will either insert the object into
358 * the namespace or simply look it up
360 walk_state
->op
= *new_op
= op
;
362 status
= walk_state
->descending_callback(walk_state
, &op
);
363 status
= acpi_ps_next_parse_state(walk_state
, op
, status
);
364 if (status
== AE_CTRL_PENDING
) {
365 status
= AE_CTRL_PARSE_PENDING
;
369 return_ACPI_STATUS(status
);
372 /*******************************************************************************
374 * FUNCTION: acpi_ps_get_arguments
376 * PARAMETERS: walk_state - Current state
377 * aml_op_start - Op start in AML
382 * DESCRIPTION: Get arguments for passed Op.
384 ******************************************************************************/
387 acpi_ps_get_arguments(struct acpi_walk_state
*walk_state
,
388 u8
* aml_op_start
, union acpi_parse_object
*op
)
390 acpi_status status
= AE_OK
;
391 union acpi_parse_object
*arg
= NULL
;
393 ACPI_FUNCTION_TRACE_PTR(ps_get_arguments
, walk_state
);
395 switch (op
->common
.aml_opcode
) {
396 case AML_BYTE_OP
: /* AML_BYTEDATA_ARG */
397 case AML_WORD_OP
: /* AML_WORDDATA_ARG */
398 case AML_DWORD_OP
: /* AML_DWORDATA_ARG */
399 case AML_QWORD_OP
: /* AML_QWORDATA_ARG */
400 case AML_STRING_OP
: /* AML_ASCIICHARLIST_ARG */
402 /* Fill in constant or string argument directly */
404 acpi_ps_get_next_simple_arg(&(walk_state
->parser_state
),
405 GET_CURRENT_ARG_TYPE(walk_state
->
410 case AML_INT_NAMEPATH_OP
: /* AML_NAMESTRING_ARG */
413 acpi_ps_get_next_namepath(walk_state
,
414 &(walk_state
->parser_state
), op
,
416 if (ACPI_FAILURE(status
)) {
417 return_ACPI_STATUS(status
);
420 walk_state
->arg_types
= 0;
425 * Op is not a constant or string, append each argument to the Op
427 while (GET_CURRENT_ARG_TYPE(walk_state
->arg_types
)
428 && !walk_state
->arg_count
) {
429 walk_state
->aml_offset
=
430 (u32
) ACPI_PTR_DIFF(walk_state
->parser_state
.aml
,
431 walk_state
->parser_state
.
435 acpi_ps_get_next_arg(walk_state
,
436 &(walk_state
->parser_state
),
438 (walk_state
->arg_types
), &arg
);
439 if (ACPI_FAILURE(status
)) {
440 return_ACPI_STATUS(status
);
444 arg
->common
.aml_offset
= walk_state
->aml_offset
;
445 acpi_ps_append_arg(op
, arg
);
448 INCREMENT_ARG_LIST(walk_state
->arg_types
);
451 /* Special processing for certain opcodes */
453 /* TBD (remove): Temporary mechanism to disable this code if needed */
455 #ifdef ACPI_ENABLE_MODULE_LEVEL_CODE
457 if ((walk_state
->pass_number
<= ACPI_IMODE_LOAD_PASS1
) &&
458 ((walk_state
->parse_flags
& ACPI_PARSE_DISASSEMBLE
) == 0)) {
460 * We want to skip If/Else/While constructs during Pass1 because we
461 * want to actually conditionally execute the code during Pass2.
463 * Except for disassembly, where we always want to walk the
464 * If/Else/While packages
466 switch (op
->common
.aml_opcode
) {
471 ACPI_DEBUG_PRINT((ACPI_DB_PARSE
,
472 "Pass1: Skipping an If/Else/While body\n"));
474 /* Skip body of if/else/while in pass 1 */
476 walk_state
->parser_state
.aml
=
477 walk_state
->parser_state
.pkg_end
;
478 walk_state
->arg_count
= 0;
487 switch (op
->common
.aml_opcode
) {
490 * Skip parsing of control method because we don't have enough
491 * info in the first pass to parse it correctly.
493 * Save the length and address of the body
495 op
->named
.data
= walk_state
->parser_state
.aml
;
496 op
->named
.length
= (u32
)
497 (walk_state
->parser_state
.pkg_end
-
498 walk_state
->parser_state
.aml
);
500 /* Skip body of method */
502 walk_state
->parser_state
.aml
=
503 walk_state
->parser_state
.pkg_end
;
504 walk_state
->arg_count
= 0;
509 case AML_VAR_PACKAGE_OP
:
511 if ((op
->common
.parent
) &&
512 (op
->common
.parent
->common
.aml_opcode
==
514 && (walk_state
->pass_number
<=
515 ACPI_IMODE_LOAD_PASS2
)) {
517 * Skip parsing of Buffers and Packages because we don't have
518 * enough info in the first pass to parse them correctly.
520 op
->named
.data
= aml_op_start
;
521 op
->named
.length
= (u32
)
522 (walk_state
->parser_state
.pkg_end
-
527 walk_state
->parser_state
.aml
=
528 walk_state
->parser_state
.pkg_end
;
529 walk_state
->arg_count
= 0;
535 if (walk_state
->control_state
) {
536 walk_state
->control_state
->control
.package_end
=
537 walk_state
->parser_state
.pkg_end
;
543 /* No action for all other opcodes */
550 return_ACPI_STATUS(AE_OK
);
553 /*******************************************************************************
555 * FUNCTION: acpi_ps_complete_op
557 * PARAMETERS: walk_state - Current state
559 * Status - Parse status before complete Op
563 * DESCRIPTION: Complete Op
565 ******************************************************************************/
568 acpi_ps_complete_op(struct acpi_walk_state
*walk_state
,
569 union acpi_parse_object
**op
, acpi_status status
)
573 ACPI_FUNCTION_TRACE_PTR(ps_complete_op
, walk_state
);
576 * Finished one argument of the containing scope
578 walk_state
->parser_state
.scope
->parse_scope
.arg_count
--;
580 /* Close this Op (will result in parse subtree deletion) */
582 status2
= acpi_ps_complete_this_op(walk_state
, *op
);
583 if (ACPI_FAILURE(status2
)) {
584 return_ACPI_STATUS(status2
);
593 case AE_CTRL_TRANSFER
:
595 /* We are about to transfer to a called method */
597 walk_state
->prev_op
= NULL
;
598 walk_state
->prev_arg_types
= walk_state
->arg_types
;
599 return_ACPI_STATUS(status
);
603 acpi_ps_pop_scope(&(walk_state
->parser_state
), op
,
604 &walk_state
->arg_types
,
605 &walk_state
->arg_count
);
608 walk_state
->op
= *op
;
609 walk_state
->op_info
=
610 acpi_ps_get_opcode_info((*op
)->common
.aml_opcode
);
611 walk_state
->opcode
= (*op
)->common
.aml_opcode
;
613 status
= walk_state
->ascending_callback(walk_state
);
615 acpi_ps_next_parse_state(walk_state
, *op
, status
);
617 status2
= acpi_ps_complete_this_op(walk_state
, *op
);
618 if (ACPI_FAILURE(status2
)) {
619 return_ACPI_STATUS(status2
);
627 case AE_CTRL_CONTINUE
:
629 /* Pop off scopes until we find the While */
631 while (!(*op
) || ((*op
)->common
.aml_opcode
!= AML_WHILE_OP
)) {
632 acpi_ps_pop_scope(&(walk_state
->parser_state
), op
,
633 &walk_state
->arg_types
,
634 &walk_state
->arg_count
);
637 /* Close this iteration of the While loop */
639 walk_state
->op
= *op
;
640 walk_state
->op_info
=
641 acpi_ps_get_opcode_info((*op
)->common
.aml_opcode
);
642 walk_state
->opcode
= (*op
)->common
.aml_opcode
;
644 status
= walk_state
->ascending_callback(walk_state
);
645 status
= acpi_ps_next_parse_state(walk_state
, *op
, status
);
647 status2
= acpi_ps_complete_this_op(walk_state
, *op
);
648 if (ACPI_FAILURE(status2
)) {
649 return_ACPI_STATUS(status2
);
655 case AE_CTRL_TERMINATE
:
661 acpi_ps_complete_this_op(walk_state
, *op
);
662 if (ACPI_FAILURE(status2
)) {
663 return_ACPI_STATUS(status2
);
666 acpi_ut_delete_generic_state
667 (acpi_ut_pop_generic_state
668 (&walk_state
->control_state
));
671 acpi_ps_pop_scope(&(walk_state
->parser_state
), op
,
672 &walk_state
->arg_types
,
673 &walk_state
->arg_count
);
677 return_ACPI_STATUS(AE_OK
);
679 default: /* All other non-AE_OK status */
684 acpi_ps_complete_this_op(walk_state
, *op
);
685 if (ACPI_FAILURE(status2
)) {
686 return_ACPI_STATUS(status2
);
690 acpi_ps_pop_scope(&(walk_state
->parser_state
), op
,
691 &walk_state
->arg_types
,
692 &walk_state
->arg_count
);
698 * TBD: Cleanup parse ops on error
701 acpi_ps_pop_scope(parser_state
, op
,
702 &walk_state
->arg_types
,
703 &walk_state
->arg_count
);
706 walk_state
->prev_op
= NULL
;
707 walk_state
->prev_arg_types
= walk_state
->arg_types
;
708 return_ACPI_STATUS(status
);
711 /* This scope complete? */
713 if (acpi_ps_has_completed_scope(&(walk_state
->parser_state
))) {
714 acpi_ps_pop_scope(&(walk_state
->parser_state
), op
,
715 &walk_state
->arg_types
,
716 &walk_state
->arg_count
);
717 ACPI_DEBUG_PRINT((ACPI_DB_PARSE
, "Popped scope, Op=%p\n", *op
));
722 ACPI_PREEMPTION_POINT();
724 return_ACPI_STATUS(AE_OK
);
727 /*******************************************************************************
729 * FUNCTION: acpi_ps_complete_final_op
731 * PARAMETERS: walk_state - Current state
733 * Status - Current parse status before complete last
738 * DESCRIPTION: Complete last Op.
740 ******************************************************************************/
743 acpi_ps_complete_final_op(struct acpi_walk_state
*walk_state
,
744 union acpi_parse_object
*op
, acpi_status status
)
748 ACPI_FUNCTION_TRACE_PTR(ps_complete_final_op
, walk_state
);
751 * Complete the last Op (if not completed), and clear the scope stack.
752 * It is easily possible to end an AML "package" with an unbounded number
753 * of open scopes (such as when several ASL blocks are closed with
754 * sequential closing braces). We want to terminate each one cleanly.
756 ACPI_DEBUG_PRINT((ACPI_DB_PARSE
, "AML package complete at Op %p\n",
760 if (walk_state
->ascending_callback
!= NULL
) {
762 walk_state
->op_info
=
763 acpi_ps_get_opcode_info(op
->common
.
765 walk_state
->opcode
= op
->common
.aml_opcode
;
768 walk_state
->ascending_callback(walk_state
);
770 acpi_ps_next_parse_state(walk_state
, op
,
772 if (status
== AE_CTRL_PENDING
) {
774 acpi_ps_complete_op(walk_state
, &op
,
776 if (ACPI_FAILURE(status
)) {
777 return_ACPI_STATUS(status
);
781 if (status
== AE_CTRL_TERMINATE
) {
788 acpi_ps_complete_this_op
808 return_ACPI_STATUS(status
);
811 else if (ACPI_FAILURE(status
)) {
813 /* First error is most important */
816 acpi_ps_complete_this_op(walk_state
,
818 return_ACPI_STATUS(status
);
822 status2
= acpi_ps_complete_this_op(walk_state
, op
);
823 if (ACPI_FAILURE(status2
)) {
824 return_ACPI_STATUS(status2
);
828 acpi_ps_pop_scope(&(walk_state
->parser_state
), &op
,
829 &walk_state
->arg_types
,
830 &walk_state
->arg_count
);
834 return_ACPI_STATUS(status
);
837 /*******************************************************************************
839 * FUNCTION: acpi_ps_parse_loop
841 * PARAMETERS: walk_state - Current state
845 * DESCRIPTION: Parse AML (pointed to by the current parser state) and return
848 ******************************************************************************/
850 acpi_status
acpi_ps_parse_loop(struct acpi_walk_state
*walk_state
)
852 acpi_status status
= AE_OK
;
853 union acpi_parse_object
*op
= NULL
; /* current op */
854 struct acpi_parse_state
*parser_state
;
855 u8
*aml_op_start
= NULL
;
857 ACPI_FUNCTION_TRACE_PTR(ps_parse_loop
, walk_state
);
859 if (walk_state
->descending_callback
== NULL
) {
860 return_ACPI_STATUS(AE_BAD_PARAMETER
);
863 parser_state
= &walk_state
->parser_state
;
864 walk_state
->arg_types
= 0;
866 #if (!defined (ACPI_NO_METHOD_EXECUTION) && !defined (ACPI_CONSTANT_EVAL_ONLY))
868 if (walk_state
->walk_type
& ACPI_WALK_METHOD_RESTART
) {
870 /* We are restarting a preempted control method */
872 if (acpi_ps_has_completed_scope(parser_state
)) {
874 * We must check if a predicate to an IF or WHILE statement
877 if ((parser_state
->scope
->parse_scope
.op
) &&
878 ((parser_state
->scope
->parse_scope
.op
->common
.
879 aml_opcode
== AML_IF_OP
)
880 || (parser_state
->scope
->parse_scope
.op
->common
.
881 aml_opcode
== AML_WHILE_OP
))
882 && (walk_state
->control_state
)
883 && (walk_state
->control_state
->common
.state
==
884 ACPI_CONTROL_PREDICATE_EXECUTING
)) {
886 * A predicate was just completed, get the value of the
887 * predicate and branch based on that value
889 walk_state
->op
= NULL
;
891 acpi_ds_get_predicate_value(walk_state
,
894 if (ACPI_FAILURE(status
)
895 && ((status
& AE_CODE_MASK
) !=
897 if (status
== AE_AML_NO_RETURN_VALUE
) {
898 ACPI_EXCEPTION((AE_INFO
, status
,
899 "Invoked method did not return a value"));
903 ACPI_EXCEPTION((AE_INFO
, status
,
904 "GetPredicate Failed"));
905 return_ACPI_STATUS(status
);
909 acpi_ps_next_parse_state(walk_state
, op
,
913 acpi_ps_pop_scope(parser_state
, &op
,
914 &walk_state
->arg_types
,
915 &walk_state
->arg_count
);
916 ACPI_DEBUG_PRINT((ACPI_DB_PARSE
,
917 "Popped scope, Op=%p\n", op
));
918 } else if (walk_state
->prev_op
) {
920 /* We were in the middle of an op */
922 op
= walk_state
->prev_op
;
923 walk_state
->arg_types
= walk_state
->prev_arg_types
;
928 /* Iterative parsing loop, while there is more AML to process: */
930 while ((parser_state
->aml
< parser_state
->aml_end
) || (op
)) {
931 aml_op_start
= parser_state
->aml
;
934 acpi_ps_create_op(walk_state
, aml_op_start
, &op
);
935 if (ACPI_FAILURE(status
)) {
936 if (status
== AE_CTRL_PARSE_CONTINUE
) {
940 if (status
== AE_CTRL_PARSE_PENDING
) {
945 acpi_ps_complete_op(walk_state
, &op
,
947 if (ACPI_FAILURE(status
)) {
948 return_ACPI_STATUS(status
);
954 op
->common
.aml_offset
= walk_state
->aml_offset
;
956 if (walk_state
->op_info
) {
957 ACPI_DEBUG_PRINT((ACPI_DB_PARSE
,
958 "Opcode %4.4X [%s] Op %p Aml %p AmlOffset %5.5X\n",
959 (u32
) op
->common
.aml_opcode
,
960 walk_state
->op_info
->name
, op
,
962 op
->common
.aml_offset
));
967 * Start arg_count at zero because we don't know if there are
970 walk_state
->arg_count
= 0;
972 /* Are there any arguments that must be processed? */
974 if (walk_state
->arg_types
) {
979 acpi_ps_get_arguments(walk_state
, aml_op_start
, op
);
980 if (ACPI_FAILURE(status
)) {
982 acpi_ps_complete_op(walk_state
, &op
,
984 if (ACPI_FAILURE(status
)) {
985 return_ACPI_STATUS(status
);
992 /* Check for arguments that need to be processed */
994 if (walk_state
->arg_count
) {
996 * There are arguments (complex ones), push Op and
997 * prepare for argument
999 status
= acpi_ps_push_scope(parser_state
, op
,
1000 walk_state
->arg_types
,
1001 walk_state
->arg_count
);
1002 if (ACPI_FAILURE(status
)) {
1004 acpi_ps_complete_op(walk_state
, &op
,
1006 if (ACPI_FAILURE(status
)) {
1007 return_ACPI_STATUS(status
);
1018 * All arguments have been processed -- Op is complete,
1021 walk_state
->op_info
=
1022 acpi_ps_get_opcode_info(op
->common
.aml_opcode
);
1023 if (walk_state
->op_info
->flags
& AML_NAMED
) {
1024 if (acpi_gbl_depth
) {
1028 if (op
->common
.aml_opcode
== AML_REGION_OP
||
1029 op
->common
.aml_opcode
== AML_DATA_REGION_OP
) {
1031 * Skip parsing of control method or opregion body,
1032 * because we don't have enough info in the first pass
1033 * to parse them correctly.
1035 * Completed parsing an op_region declaration, we now
1039 (u32
) (parser_state
->aml
- op
->named
.data
);
1043 if (walk_state
->op_info
->flags
& AML_CREATE
) {
1045 * Backup to beginning of create_xXXfield declaration (1 for
1048 * body_length is unknown until we parse the body
1051 (u32
) (parser_state
->aml
- op
->named
.data
);
1054 if (op
->common
.aml_opcode
== AML_BANK_FIELD_OP
) {
1056 * Backup to beginning of bank_field declaration
1058 * body_length is unknown until we parse the body
1061 (u32
) (parser_state
->aml
- op
->named
.data
);
1064 /* This op complete, notify the dispatcher */
1066 if (walk_state
->ascending_callback
!= NULL
) {
1067 walk_state
->op
= op
;
1068 walk_state
->opcode
= op
->common
.aml_opcode
;
1070 status
= walk_state
->ascending_callback(walk_state
);
1072 acpi_ps_next_parse_state(walk_state
, op
, status
);
1073 if (status
== AE_CTRL_PENDING
) {
1078 status
= acpi_ps_complete_op(walk_state
, &op
, status
);
1079 if (ACPI_FAILURE(status
)) {
1080 return_ACPI_STATUS(status
);
1083 } /* while parser_state->Aml */
1085 status
= acpi_ps_complete_final_op(walk_state
, op
, status
);
1086 return_ACPI_STATUS(status
);