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Linux kernel mirror (for testing)
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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
68acpi_status
69acpi_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
90 walk_state = acpi_ds_create_walk_state (table_desc->table_id,
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
128acpi_status
129acpi_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 */
149 status = acpi_ns_one_complete_parse (1, table_desc);
150 if (ACPI_FAILURE (status)) {
151 return_ACPI_STATUS (status);
152 }
153
154 /*
155 * AML Parse, pass 2
156 *
157 * In this pass, we resolve forward references and other things
158 * that could not be completed during the first pass.
159 * Another complete parse of the AML is performed, but the
160 * overhead of this is compensated for by the fact that the
161 * parse objects are all cached.
162 */
163 status = acpi_ns_one_complete_parse (2, table_desc);
164 if (ACPI_FAILURE (status)) {
165 return_ACPI_STATUS (status);
166 }
167
168 return_ACPI_STATUS (status);
169}
170
171