1 /******************************************************************************
3 * Module Name: nsparse - namespace interface to AML parser
5 *****************************************************************************/
8 * Copyright (C) 2000 - 2004, R. Byron Moore
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23 * of any contributors may be used to endorse or promote products derived
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45 #include <acpi/acpi.h>
46 #include <acpi/acnamesp.h>
47 #include <acpi/acparser.h>
48 #include <acpi/acdispat.h>
51 #define _COMPONENT ACPI_NAMESPACE
52 ACPI_MODULE_NAME ("nsparse")
55 /*******************************************************************************
57 * FUNCTION: ns_one_complete_parse
59 * PARAMETERS: pass_number - 1 or 2
60 * table_desc - The table to be parsed.
64 * DESCRIPTION: Perform one complete parse of an ACPI/AML table.
66 ******************************************************************************/
69 acpi_ns_one_complete_parse (
71 struct acpi_table_desc *table_desc)
73 union acpi_parse_object *parse_root;
75 struct acpi_walk_state *walk_state;
78 ACPI_FUNCTION_TRACE ("ns_one_complete_parse");
81 /* Create and init a Root Node */
83 parse_root = acpi_ps_create_scope_op ();
85 return_ACPI_STATUS (AE_NO_MEMORY);
88 /* Create and initialize a new walk state */
90 walk_state = acpi_ds_create_walk_state (table_desc->table_id,
93 acpi_ps_free_op (parse_root);
94 return_ACPI_STATUS (AE_NO_MEMORY);
97 status = acpi_ds_init_aml_walk (walk_state, parse_root, NULL, table_desc->aml_start,
98 table_desc->aml_length, NULL, NULL, pass_number);
99 if (ACPI_FAILURE (status)) {
100 acpi_ds_delete_walk_state (walk_state);
101 return_ACPI_STATUS (status);
106 ACPI_DEBUG_PRINT ((ACPI_DB_PARSE, "*PARSE* pass %d parse\n", pass_number));
107 status = acpi_ps_parse_aml (walk_state);
109 acpi_ps_delete_parse_tree (parse_root);
110 return_ACPI_STATUS (status);
114 /*******************************************************************************
116 * FUNCTION: acpi_ns_parse_table
118 * PARAMETERS: table_desc - An ACPI table descriptor for table to parse
119 * start_node - Where to enter the table into the namespace
123 * DESCRIPTION: Parse AML within an ACPI table and return a tree of ops
125 ******************************************************************************/
128 acpi_ns_parse_table (
129 struct acpi_table_desc *table_desc,
130 struct acpi_namespace_node *start_node)
135 ACPI_FUNCTION_TRACE ("ns_parse_table");
141 * In this pass, we load most of the namespace. Control methods
142 * are not parsed until later. A parse tree is not created. Instead,
143 * each Parser Op subtree is deleted when it is finished. This saves
144 * a great deal of memory, and allows a small cache of parse objects
145 * to service the entire parse. The second pass of the parse then
146 * performs another complete parse of the AML..
148 status = acpi_ns_one_complete_parse (1, table_desc);
149 if (ACPI_FAILURE (status)) {
150 return_ACPI_STATUS (status);
156 * In this pass, we resolve forward references and other things
157 * that could not be completed during the first pass.
158 * Another complete parse of the AML is performed, but the
159 * overhead of this is compensated for by the fact that the
160 * parse objects are all cached.
162 status = acpi_ns_one_complete_parse (2, table_desc);
163 if (ACPI_FAILURE (status)) {
164 return_ACPI_STATUS (status);
167 return_ACPI_STATUS (status);