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1/******************************************************************************
2 *
3 * Module Name: nsparse - namespace interface to AML parser
4 *
5 *****************************************************************************/
6
7/*
8 * Copyright (C) 2000 - 2008, 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 <acpi/accommon.h>
46#include <acpi/acnamesp.h>
47#include <acpi/acparser.h>
48#include <acpi/acdispat.h>
49#include <acpi/actables.h>
50
51#define _COMPONENT ACPI_NAMESPACE
52ACPI_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 ******************************************************************************/
66acpi_status
67acpi_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_tb_get_owner_id(table_index, &owner_id);
82 if (ACPI_FAILURE(status)) {
83 return_ACPI_STATUS(status);
84 }
85
86 /* Create and init a Root Node */
87
88 parse_root = acpi_ps_create_scope_op();
89 if (!parse_root) {
90 return_ACPI_STATUS(AE_NO_MEMORY);
91 }
92
93 /* Create and initialize a new walk state */
94
95 walk_state = acpi_ds_create_walk_state(owner_id, NULL, NULL, NULL);
96 if (!walk_state) {
97 acpi_ps_free_op(parse_root);
98 return_ACPI_STATUS(AE_NO_MEMORY);
99 }
100
101 status = acpi_get_table_by_index(table_index, &table);
102 if (ACPI_FAILURE(status)) {
103 acpi_ds_delete_walk_state(walk_state);
104 acpi_ps_free_op(parse_root);
105 return_ACPI_STATUS(status);
106 }
107
108 /* Table must consist of at least a complete header */
109
110 if (table->length < sizeof(struct acpi_table_header)) {
111 status = AE_BAD_HEADER;
112 } else {
113 aml_start = (u8 *) table + sizeof(struct acpi_table_header);
114 aml_length = table->length - sizeof(struct acpi_table_header);
115 status = acpi_ds_init_aml_walk(walk_state, parse_root, NULL,
116 aml_start, aml_length, NULL,
117 (u8) pass_number);
118 }
119
120 if (ACPI_FAILURE(status)) {
121 acpi_ds_delete_walk_state(walk_state);
122 goto cleanup;
123 }
124
125 /* start_node is the default location to load the table */
126
127 if (start_node && start_node != acpi_gbl_root_node) {
128 status =
129 acpi_ds_scope_stack_push(start_node, ACPI_TYPE_METHOD,
130 walk_state);
131 if (ACPI_FAILURE(status)) {
132 acpi_ds_delete_walk_state(walk_state);
133 goto cleanup;
134 }
135 }
136
137 /* Parse the AML */
138
139 ACPI_DEBUG_PRINT((ACPI_DB_PARSE, "*PARSE* pass %d parse\n",
140 (unsigned)pass_number));
141 status = acpi_ps_parse_aml(walk_state);
142
143 cleanup:
144 acpi_ps_delete_parse_tree(parse_root);
145 return_ACPI_STATUS(status);
146}
147
148/*******************************************************************************
149 *
150 * FUNCTION: acpi_ns_parse_table
151 *
152 * PARAMETERS: table_desc - An ACPI table descriptor for table to parse
153 * start_node - Where to enter the table into the namespace
154 *
155 * RETURN: Status
156 *
157 * DESCRIPTION: Parse AML within an ACPI table and return a tree of ops
158 *
159 ******************************************************************************/
160
161acpi_status
162acpi_ns_parse_table(u32 table_index, struct acpi_namespace_node *start_node)
163{
164 acpi_status status;
165
166 ACPI_FUNCTION_TRACE(ns_parse_table);
167
168 /*
169 * AML Parse, pass 1
170 *
171 * In this pass, we load most of the namespace. Control methods
172 * are not parsed until later. A parse tree is not created. Instead,
173 * each Parser Op subtree is deleted when it is finished. This saves
174 * a great deal of memory, and allows a small cache of parse objects
175 * to service the entire parse. The second pass of the parse then
176 * performs another complete parse of the AML.
177 */
178 ACPI_DEBUG_PRINT((ACPI_DB_PARSE, "**** Start pass 1\n"));
179 status =
180 acpi_ns_one_complete_parse(ACPI_IMODE_LOAD_PASS1, table_index,
181 start_node);
182 if (ACPI_FAILURE(status)) {
183 return_ACPI_STATUS(status);
184 }
185
186 /*
187 * AML Parse, pass 2
188 *
189 * In this pass, we resolve forward references and other things
190 * that could not be completed during the first pass.
191 * Another complete parse of the AML is performed, but the
192 * overhead of this is compensated for by the fact that the
193 * parse objects are all cached.
194 */
195 ACPI_DEBUG_PRINT((ACPI_DB_PARSE, "**** Start pass 2\n"));
196 status =
197 acpi_ns_one_complete_parse(ACPI_IMODE_LOAD_PASS2, table_index,
198 start_node);
199 if (ACPI_FAILURE(status)) {
200 return_ACPI_STATUS(status);
201 }
202
203 return_ACPI_STATUS(status);
204}