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1da177e4 LT |
1 | /****************************************************************************** |
2 | * | |
3 | * Module Name: nsparse - namespace interface to AML parser | |
4 | * | |
5 | *****************************************************************************/ | |
6 | ||
7 | /* | |
8 | * Copyright (C) 2000 - 2005, R. Byron Moore | |
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 | ||
45 | #include <acpi/acpi.h> | |
46 | #include <acpi/acnamesp.h> | |
47 | #include <acpi/acparser.h> | |
48 | #include <acpi/acdispat.h> | |
49 | ||
50 | ||
51 | #define _COMPONENT ACPI_NAMESPACE | |
52 | ACPI_MODULE_NAME ("nsparse") | |
53 | ||
54 | ||
55 | /******************************************************************************* | |
56 | * | |
57 | * FUNCTION: ns_one_complete_parse | |
58 | * | |
59 | * PARAMETERS: pass_number - 1 or 2 | |
60 | * table_desc - The table to be parsed. | |
61 | * | |
62 | * RETURN: Status | |
63 | * | |
64 | * DESCRIPTION: Perform one complete parse of an ACPI/AML table. | |
65 | * | |
66 | ******************************************************************************/ | |
67 | ||
68 | acpi_status | |
69 | acpi_ns_one_complete_parse ( | |
70 | u32 pass_number, | |
71 | struct acpi_table_desc *table_desc) | |
72 | { | |
73 | union acpi_parse_object *parse_root; | |
74 | acpi_status status; | |
75 | struct acpi_walk_state *walk_state; | |
76 | ||
77 | ||
78 | ACPI_FUNCTION_TRACE ("ns_one_complete_parse"); | |
79 | ||
80 | ||
81 | /* Create and init a Root Node */ | |
82 | ||
83 | parse_root = acpi_ps_create_scope_op (); | |
84 | if (!parse_root) { | |
85 | return_ACPI_STATUS (AE_NO_MEMORY); | |
86 | } | |
87 | ||
88 | /* Create and initialize a new walk state */ | |
89 | ||
f9f4601f | 90 | walk_state = acpi_ds_create_walk_state (table_desc->owner_id, |
1da177e4 LT |
91 | NULL, NULL, NULL); |
92 | if (!walk_state) { | |
93 | acpi_ps_free_op (parse_root); | |
94 | return_ACPI_STATUS (AE_NO_MEMORY); | |
95 | } | |
96 | ||
97 | status = acpi_ds_init_aml_walk (walk_state, parse_root, NULL, | |
98 | table_desc->aml_start, table_desc->aml_length, | |
99 | NULL, pass_number); | |
100 | if (ACPI_FAILURE (status)) { | |
101 | acpi_ds_delete_walk_state (walk_state); | |
102 | return_ACPI_STATUS (status); | |
103 | } | |
104 | ||
105 | /* Parse the AML */ | |
106 | ||
107 | ACPI_DEBUG_PRINT ((ACPI_DB_PARSE, "*PARSE* pass %d parse\n", pass_number)); | |
108 | status = acpi_ps_parse_aml (walk_state); | |
109 | ||
110 | acpi_ps_delete_parse_tree (parse_root); | |
111 | return_ACPI_STATUS (status); | |
112 | } | |
113 | ||
114 | ||
115 | /******************************************************************************* | |
116 | * | |
117 | * FUNCTION: acpi_ns_parse_table | |
118 | * | |
119 | * PARAMETERS: table_desc - An ACPI table descriptor for table to parse | |
120 | * start_node - Where to enter the table into the namespace | |
121 | * | |
122 | * RETURN: Status | |
123 | * | |
124 | * DESCRIPTION: Parse AML within an ACPI table and return a tree of ops | |
125 | * | |
126 | ******************************************************************************/ | |
127 | ||
128 | acpi_status | |
129 | acpi_ns_parse_table ( | |
130 | struct acpi_table_desc *table_desc, | |
131 | struct acpi_namespace_node *start_node) | |
132 | { | |
133 | acpi_status status; | |
134 | ||
135 | ||
136 | ACPI_FUNCTION_TRACE ("ns_parse_table"); | |
137 | ||
138 | ||
139 | /* | |
140 | * AML Parse, pass 1 | |
141 | * | |
142 | * In this pass, we load most of the namespace. Control methods | |
143 | * are not parsed until later. A parse tree is not created. Instead, | |
144 | * each Parser Op subtree is deleted when it is finished. This saves | |
145 | * a great deal of memory, and allows a small cache of parse objects | |
146 | * to service the entire parse. The second pass of the parse then | |
147 | * performs another complete parse of the AML.. | |
148 | */ | |
88ac00f5 | 149 | ACPI_DEBUG_PRINT ((ACPI_DB_PARSE, "**** Start pass 1\n")); |
1da177e4 LT |
150 | status = acpi_ns_one_complete_parse (1, table_desc); |
151 | if (ACPI_FAILURE (status)) { | |
152 | return_ACPI_STATUS (status); | |
153 | } | |
154 | ||
155 | /* | |
156 | * AML Parse, pass 2 | |
157 | * | |
158 | * In this pass, we resolve forward references and other things | |
159 | * that could not be completed during the first pass. | |
160 | * Another complete parse of the AML is performed, but the | |
161 | * overhead of this is compensated for by the fact that the | |
162 | * parse objects are all cached. | |
163 | */ | |
88ac00f5 | 164 | ACPI_DEBUG_PRINT ((ACPI_DB_PARSE, "**** Start pass 2\n")); |
1da177e4 LT |
165 | status = acpi_ns_one_complete_parse (2, table_desc); |
166 | if (ACPI_FAILURE (status)) { | |
167 | return_ACPI_STATUS (status); | |
168 | } | |
169 | ||
170 | return_ACPI_STATUS (status); | |
171 | } | |
172 | ||
173 |