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1 | /****************************************************************************** | |
2 | * | |
3 | * Module Name: nsparse - namespace interface to AML parser | |
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 "acnamesp.h" | |
47 | #include "acparser.h" | |
48 | #include "acdispat.h" | |
49 | #include "actables.h" | |
50 | ||
51 | #define _COMPONENT ACPI_NAMESPACE | |
52 | ACPI_MODULE_NAME("nsparse") | |
53 | ||
54 | /******************************************************************************* | |
55 | * | |
56 | * FUNCTION: ns_one_complete_parse | |
57 | * | |
58 | * PARAMETERS: pass_number - 1 or 2 | |
59 | * table_desc - The table to be parsed. | |
60 | * | |
61 | * RETURN: Status | |
62 | * | |
63 | * DESCRIPTION: Perform one complete parse of an ACPI/AML table. | |
64 | * | |
65 | ******************************************************************************/ | |
66 | acpi_status | |
67 | acpi_ns_one_complete_parse(u32 pass_number, | |
68 | u32 table_index, | |
69 | struct acpi_namespace_node *start_node) | |
70 | { | |
71 | union acpi_parse_object *parse_root; | |
72 | acpi_status status; | |
73 | u32 aml_length; | |
74 | u8 *aml_start; | |
75 | struct acpi_walk_state *walk_state; | |
76 | struct acpi_table_header *table; | |
77 | acpi_owner_id owner_id; | |
78 | ||
79 | ACPI_FUNCTION_TRACE(ns_one_complete_parse); | |
80 | ||
81 | status = acpi_get_table_by_index(table_index, &table); | |
82 | if (ACPI_FAILURE(status)) { | |
83 | return_ACPI_STATUS(status); | |
84 | } | |
85 | ||
86 | /* Table must consist of at least a complete header */ | |
87 | ||
88 | if (table->length < sizeof(struct acpi_table_header)) { | |
89 | return_ACPI_STATUS(AE_BAD_HEADER); | |
90 | } | |
91 | ||
92 | aml_start = (u8 *)table + sizeof(struct acpi_table_header); | |
93 | aml_length = table->length - sizeof(struct acpi_table_header); | |
94 | ||
95 | status = acpi_tb_get_owner_id(table_index, &owner_id); | |
96 | if (ACPI_FAILURE(status)) { | |
97 | return_ACPI_STATUS(status); | |
98 | } | |
99 | ||
100 | /* Create and init a Root Node */ | |
101 | ||
102 | parse_root = acpi_ps_create_scope_op(aml_start); | |
103 | if (!parse_root) { | |
104 | return_ACPI_STATUS(AE_NO_MEMORY); | |
105 | } | |
106 | ||
107 | /* Create and initialize a new walk state */ | |
108 | ||
109 | walk_state = acpi_ds_create_walk_state(owner_id, NULL, NULL, NULL); | |
110 | if (!walk_state) { | |
111 | acpi_ps_free_op(parse_root); | |
112 | return_ACPI_STATUS(AE_NO_MEMORY); | |
113 | } | |
114 | ||
115 | status = acpi_ds_init_aml_walk(walk_state, parse_root, NULL, | |
116 | aml_start, aml_length, NULL, | |
117 | (u8)pass_number); | |
118 | if (ACPI_FAILURE(status)) { | |
119 | acpi_ds_delete_walk_state(walk_state); | |
120 | goto cleanup; | |
121 | } | |
122 | ||
123 | /* Found OSDT table, enable the namespace override feature */ | |
124 | ||
125 | if (ACPI_COMPARE_NAME(table->signature, ACPI_SIG_OSDT) && | |
126 | pass_number == ACPI_IMODE_LOAD_PASS1) { | |
127 | walk_state->namespace_override = TRUE; | |
128 | } | |
129 | ||
130 | /* start_node is the default location to load the table */ | |
131 | ||
132 | if (start_node && start_node != acpi_gbl_root_node) { | |
133 | status = | |
134 | acpi_ds_scope_stack_push(start_node, ACPI_TYPE_METHOD, | |
135 | walk_state); | |
136 | if (ACPI_FAILURE(status)) { | |
137 | acpi_ds_delete_walk_state(walk_state); | |
138 | goto cleanup; | |
139 | } | |
140 | } | |
141 | ||
142 | /* Parse the AML */ | |
143 | ||
144 | ACPI_DEBUG_PRINT((ACPI_DB_PARSE, | |
145 | "*PARSE* pass %u parse\n", pass_number)); | |
146 | status = acpi_ps_parse_aml(walk_state); | |
147 | ||
148 | cleanup: | |
149 | acpi_ps_delete_parse_tree(parse_root); | |
150 | return_ACPI_STATUS(status); | |
151 | } | |
152 | ||
153 | /******************************************************************************* | |
154 | * | |
155 | * FUNCTION: acpi_ns_parse_table | |
156 | * | |
157 | * PARAMETERS: table_desc - An ACPI table descriptor for table to parse | |
158 | * start_node - Where to enter the table into the namespace | |
159 | * | |
160 | * RETURN: Status | |
161 | * | |
162 | * DESCRIPTION: Parse AML within an ACPI table and return a tree of ops | |
163 | * | |
164 | ******************************************************************************/ | |
165 | ||
166 | acpi_status | |
167 | acpi_ns_parse_table(u32 table_index, struct acpi_namespace_node *start_node) | |
168 | { | |
169 | acpi_status status; | |
170 | ||
171 | ACPI_FUNCTION_TRACE(ns_parse_table); | |
172 | ||
173 | /* | |
174 | * AML Parse, pass 1 | |
175 | * | |
176 | * In this pass, we load most of the namespace. Control methods | |
177 | * are not parsed until later. A parse tree is not created. Instead, | |
178 | * each Parser Op subtree is deleted when it is finished. This saves | |
179 | * a great deal of memory, and allows a small cache of parse objects | |
180 | * to service the entire parse. The second pass of the parse then | |
181 | * performs another complete parse of the AML. | |
182 | */ | |
183 | ACPI_DEBUG_PRINT((ACPI_DB_PARSE, "**** Start pass 1\n")); | |
184 | ||
185 | status = acpi_ns_one_complete_parse(ACPI_IMODE_LOAD_PASS1, | |
186 | table_index, start_node); | |
187 | if (ACPI_FAILURE(status)) { | |
188 | return_ACPI_STATUS(status); | |
189 | } | |
190 | ||
191 | /* | |
192 | * AML Parse, pass 2 | |
193 | * | |
194 | * In this pass, we resolve forward references and other things | |
195 | * that could not be completed during the first pass. | |
196 | * Another complete parse of the AML is performed, but the | |
197 | * overhead of this is compensated for by the fact that the | |
198 | * parse objects are all cached. | |
199 | */ | |
200 | ACPI_DEBUG_PRINT((ACPI_DB_PARSE, "**** Start pass 2\n")); | |
201 | status = acpi_ns_one_complete_parse(ACPI_IMODE_LOAD_PASS2, | |
202 | table_index, start_node); | |
203 | if (ACPI_FAILURE(status)) { | |
204 | return_ACPI_STATUS(status); | |
205 | } | |
206 | ||
207 | return_ACPI_STATUS(status); | |
208 | } |