1 /******************************************************************************
2 *
3 * Module Name: nsparse - namespace interface to AML parser
4 *
5 *****************************************************************************/
6
7 /*
8 * Copyright (C) 2000 - 2014, 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 #define __NSPARSE_C__
45
46 #include "acpi.h"
47 #include "accommon.h"
48 #include "acnamesp.h"
49 #include "acparser.h"
50 #include "acdispat.h"
51 #include "actables.h"
52
53
54 #define _COMPONENT ACPI_NAMESPACE
55 ACPI_MODULE_NAME ("nsparse")
56
57
58 /*******************************************************************************
59 *
60 * FUNCTION: NsOneCompleteParse
61 *
62 * PARAMETERS: PassNumber - 1 or 2
63 * TableDesc - The table to be parsed.
64 *
65 * RETURN: Status
66 *
67 * DESCRIPTION: Perform one complete parse of an ACPI/AML table.
68 *
69 ******************************************************************************/
70
71 ACPI_STATUS
72 AcpiNsOneCompleteParse (
73 UINT32 PassNumber,
74 UINT32 TableIndex,
75 ACPI_NAMESPACE_NODE *StartNode)
76 {
77 ACPI_PARSE_OBJECT *ParseRoot;
78 ACPI_STATUS Status;
79 UINT32 AmlLength;
80 UINT8 *AmlStart;
81 ACPI_WALK_STATE *WalkState;
82 ACPI_TABLE_HEADER *Table;
83 ACPI_OWNER_ID OwnerId;
84
85
86 ACPI_FUNCTION_TRACE (NsOneCompleteParse);
87
88
89 Status = AcpiTbGetOwnerId (TableIndex, &OwnerId);
90 if (ACPI_FAILURE (Status))
91 {
92 return_ACPI_STATUS (Status);
93 }
94
95 /* Create and init a Root Node */
96
97 ParseRoot = AcpiPsCreateScopeOp ();
98 if (!ParseRoot)
99 {
100 return_ACPI_STATUS (AE_NO_MEMORY);
101 }
102
103 /* Create and initialize a new walk state */
104
105 WalkState = AcpiDsCreateWalkState (OwnerId, NULL, NULL, NULL);
106 if (!WalkState)
107 {
108 AcpiPsFreeOp (ParseRoot);
109 return_ACPI_STATUS (AE_NO_MEMORY);
110 }
111
112 Status = AcpiGetTableByIndex (TableIndex, &Table);
113 if (ACPI_FAILURE (Status))
114 {
115 AcpiDsDeleteWalkState (WalkState);
116 AcpiPsFreeOp (ParseRoot);
117 return_ACPI_STATUS (Status);
118 }
119
120 /* Table must consist of at least a complete header */
121
122 if (Table->Length < sizeof (ACPI_TABLE_HEADER))
123 {
124 Status = AE_BAD_HEADER;
125 }
126 else
127 {
128 AmlStart = (UINT8 *) Table + sizeof (ACPI_TABLE_HEADER);
129 AmlLength = Table->Length - sizeof (ACPI_TABLE_HEADER);
130 Status = AcpiDsInitAmlWalk (WalkState, ParseRoot, NULL,
131 AmlStart, AmlLength, NULL, (UINT8) PassNumber);
132 }
133
134 if (ACPI_FAILURE (Status))
135 {
136 AcpiDsDeleteWalkState (WalkState);
137 goto Cleanup;
138 }
139
140 /* StartNode is the default location to load the table */
141
142 if (StartNode && StartNode != AcpiGbl_RootNode)
143 {
144 Status = AcpiDsScopeStackPush (StartNode, ACPI_TYPE_METHOD, WalkState);
145 if (ACPI_FAILURE (Status))
146 {
147 AcpiDsDeleteWalkState (WalkState);
148 goto Cleanup;
149 }
150 }
151
152 /* Parse the AML */
153
154 ACPI_DEBUG_PRINT ((ACPI_DB_PARSE, "*PARSE* pass %u parse\n", PassNumber));
155 Status = AcpiPsParseAml (WalkState);
156
157 Cleanup:
158 AcpiPsDeleteParseTree (ParseRoot);
159 return_ACPI_STATUS (Status);
160 }
161
162
163 /*******************************************************************************
164 *
165 * FUNCTION: AcpiNsParseTable
166 *
167 * PARAMETERS: TableDesc - An ACPI table descriptor for table to parse
168 * StartNode - Where to enter the table into the namespace
169 *
170 * RETURN: Status
171 *
172 * DESCRIPTION: Parse AML within an ACPI table and return a tree of ops
173 *
174 ******************************************************************************/
175
176 ACPI_STATUS
177 AcpiNsParseTable (
178 UINT32 TableIndex,
179 ACPI_NAMESPACE_NODE *StartNode)
180 {
181 ACPI_STATUS Status;
182
183
184 ACPI_FUNCTION_TRACE (NsParseTable);
185
186
187 /*
188 * AML Parse, pass 1
189 *
190 * In this pass, we load most of the namespace. Control methods
191 * are not parsed until later. A parse tree is not created. Instead,
192 * each Parser Op subtree is deleted when it is finished. This saves
193 * a great deal of memory, and allows a small cache of parse objects
194 * to service the entire parse. The second pass of the parse then
195 * performs another complete parse of the AML.
196 */
197 ACPI_DEBUG_PRINT ((ACPI_DB_PARSE, "**** Start pass 1\n"));
198 Status = AcpiNsOneCompleteParse (ACPI_IMODE_LOAD_PASS1,
199 TableIndex, StartNode);
200 if (ACPI_FAILURE (Status))
201 {
202 return_ACPI_STATUS (Status);
203 }
204
205 /*
206 * AML Parse, pass 2
207 *
208 * In this pass, we resolve forward references and other things
209 * that could not be completed during the first pass.
210 * Another complete parse of the AML is performed, but the
211 * overhead of this is compensated for by the fact that the
212 * parse objects are all cached.
213 */
214 ACPI_DEBUG_PRINT ((ACPI_DB_PARSE, "**** Start pass 2\n"));
215 Status = AcpiNsOneCompleteParse (ACPI_IMODE_LOAD_PASS2,
216 TableIndex, StartNode);
217 if (ACPI_FAILURE (Status))
218 {
219 return_ACPI_STATUS (Status);
220 }
221
222 return_ACPI_STATUS (Status);
223 }