blob: 5808c89e9fac1638d26a240a42482baf72c8f7e8 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/******************************************************************************
2 *
3 * Module Name: nsparse - namespace interface to AML parser
4 *
5 *****************************************************************************/
6
7/*
Bob Moorea8357b02010-01-22 19:07:36 +08008 * Copyright (C) 2000 - 2010, Intel Corp.
Linus Torvalds1da177e2005-04-16 15:20:36 -07009 * 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
Linus Torvalds1da177e2005-04-16 15:20:36 -070044#include <acpi/acpi.h>
Len Browne2f7a772009-01-09 00:30:03 -050045#include "accommon.h"
46#include "acnamesp.h"
47#include "acparser.h"
48#include "acdispat.h"
49#include "actables.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070050
Linus Torvalds1da177e2005-04-16 15:20:36 -070051#define _COMPONENT ACPI_NAMESPACE
Len Brown4be44fc2005-08-05 00:44:28 -040052ACPI_MODULE_NAME("nsparse")
Linus Torvalds1da177e2005-04-16 15:20:36 -070053
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 ******************************************************************************/
Linus Torvalds1da177e2005-04-16 15:20:36 -070066acpi_status
Bob Moore67a119f2008-06-10 13:42:13 +080067acpi_ns_one_complete_parse(u32 pass_number,
68 u32 table_index,
69 struct acpi_namespace_node *start_node)
Linus Torvalds1da177e2005-04-16 15:20:36 -070070{
Len Brown4be44fc2005-08-05 00:44:28 -040071 union acpi_parse_object *parse_root;
72 acpi_status status;
Bob Moore67a119f2008-06-10 13:42:13 +080073 u32 aml_length;
Bob Mooref3d2e782007-02-02 19:48:18 +030074 u8 *aml_start;
Len Brown4be44fc2005-08-05 00:44:28 -040075 struct acpi_walk_state *walk_state;
Bob Mooref3d2e782007-02-02 19:48:18 +030076 struct acpi_table_header *table;
77 acpi_owner_id owner_id;
Linus Torvalds1da177e2005-04-16 15:20:36 -070078
Bob Mooreb229cf92006-04-21 17:15:00 -040079 ACPI_FUNCTION_TRACE(ns_one_complete_parse);
Linus Torvalds1da177e2005-04-16 15:20:36 -070080
Bob Mooref3d2e782007-02-02 19:48:18 +030081 status = acpi_tb_get_owner_id(table_index, &owner_id);
82 if (ACPI_FAILURE(status)) {
83 return_ACPI_STATUS(status);
84 }
85
Linus Torvalds1da177e2005-04-16 15:20:36 -070086 /* Create and init a Root Node */
87
Len Brown4be44fc2005-08-05 00:44:28 -040088 parse_root = acpi_ps_create_scope_op();
Linus Torvalds1da177e2005-04-16 15:20:36 -070089 if (!parse_root) {
Len Brown4be44fc2005-08-05 00:44:28 -040090 return_ACPI_STATUS(AE_NO_MEMORY);
Linus Torvalds1da177e2005-04-16 15:20:36 -070091 }
92
93 /* Create and initialize a new walk state */
94
Bob Mooref3d2e782007-02-02 19:48:18 +030095 walk_state = acpi_ds_create_walk_state(owner_id, NULL, NULL, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -070096 if (!walk_state) {
Len Brown4be44fc2005-08-05 00:44:28 -040097 acpi_ps_free_op(parse_root);
98 return_ACPI_STATUS(AE_NO_MEMORY);
Linus Torvalds1da177e2005-04-16 15:20:36 -070099 }
100
Bob Mooref3d2e782007-02-02 19:48:18 +0300101 status = acpi_get_table_by_index(table_index, &table);
Len Brown4be44fc2005-08-05 00:44:28 -0400102 if (ACPI_FAILURE(status)) {
103 acpi_ds_delete_walk_state(walk_state);
Bob Mooref3d2e782007-02-02 19:48:18 +0300104 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,
Bob Moore67a119f2008-06-10 13:42:13 +0800116 aml_start, aml_length, NULL,
117 (u8) pass_number);
Bob Mooref3d2e782007-02-02 19:48:18 +0300118 }
119
120 if (ACPI_FAILURE(status)) {
121 acpi_ds_delete_walk_state(walk_state);
Bob Moore1d18c052008-04-10 19:06:40 +0400122 goto cleanup;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123 }
124
Bob Moore7f4ac9f2008-04-10 19:06:39 +0400125 /* start_node is the default location to load the table */
126
127 if (start_node && start_node != acpi_gbl_root_node) {
Bob Moore1d18c052008-04-10 19:06:40 +0400128 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 }
Bob Moore7f4ac9f2008-04-10 19:06:39 +0400135 }
136
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137 /* Parse the AML */
138
Bob Mooreb27d6592010-05-26 11:47:13 +0800139 ACPI_DEBUG_PRINT((ACPI_DB_PARSE, "*PARSE* pass %u parse\n",
140 pass_number));
Len Brown4be44fc2005-08-05 00:44:28 -0400141 status = acpi_ps_parse_aml(walk_state);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142
Bob Moore1d18c052008-04-10 19:06:40 +0400143 cleanup:
Len Brown4be44fc2005-08-05 00:44:28 -0400144 acpi_ps_delete_parse_tree(parse_root);
145 return_ACPI_STATUS(status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146}
147
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148/*******************************************************************************
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
Bob Moore67a119f2008-06-10 13:42:13 +0800162acpi_ns_parse_table(u32 table_index, struct acpi_namespace_node *start_node)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163{
Len Brown4be44fc2005-08-05 00:44:28 -0400164 acpi_status status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165
Bob Mooreb229cf92006-04-21 17:15:00 -0400166 ACPI_FUNCTION_TRACE(ns_parse_table);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167
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
Bob Mooreec3153f2007-02-02 19:48:21 +0300176 * performs another complete parse of the AML.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177 */
Len Brown4be44fc2005-08-05 00:44:28 -0400178 ACPI_DEBUG_PRINT((ACPI_DB_PARSE, "**** Start pass 1\n"));
Bob Moored4913dc2009-03-06 10:05:18 +0800179 status = acpi_ns_one_complete_parse(ACPI_IMODE_LOAD_PASS1,
180 table_index, start_node);
Len Brown4be44fc2005-08-05 00:44:28 -0400181 if (ACPI_FAILURE(status)) {
182 return_ACPI_STATUS(status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183 }
184
185 /*
186 * AML Parse, pass 2
187 *
188 * In this pass, we resolve forward references and other things
189 * that could not be completed during the first pass.
190 * Another complete parse of the AML is performed, but the
191 * overhead of this is compensated for by the fact that the
192 * parse objects are all cached.
193 */
Len Brown4be44fc2005-08-05 00:44:28 -0400194 ACPI_DEBUG_PRINT((ACPI_DB_PARSE, "**** Start pass 2\n"));
Bob Moored4913dc2009-03-06 10:05:18 +0800195 status = acpi_ns_one_complete_parse(ACPI_IMODE_LOAD_PASS2,
196 table_index, start_node);
Len Brown4be44fc2005-08-05 00:44:28 -0400197 if (ACPI_FAILURE(status)) {
198 return_ACPI_STATUS(status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199 }
200
Len Brown4be44fc2005-08-05 00:44:28 -0400201 return_ACPI_STATUS(status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202}