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Diffstat (limited to 'drivers/acpi/namespace/nsparse.c')
| -rw-r--r-- | drivers/acpi/namespace/nsparse.c | 171 |
1 files changed, 171 insertions, 0 deletions
diff --git a/drivers/acpi/namespace/nsparse.c b/drivers/acpi/namespace/nsparse.c new file mode 100644 index 000000000000..a0e13e8d3764 --- /dev/null +++ b/drivers/acpi/namespace/nsparse.c @@ -0,0 +1,171 @@ +/****************************************************************************** + * + * Module Name: nsparse - namespace interface to AML parser + * + *****************************************************************************/ + +/* + * Copyright (C) 2000 - 2005, R. Byron Moore + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions, and the following disclaimer, + * without modification. + * 2. Redistributions in binary form must reproduce at minimum a disclaimer + * substantially similar to the "NO WARRANTY" disclaimer below + * ("Disclaimer") and any redistribution must be conditioned upon + * including a substantially similar Disclaimer requirement for further + * binary redistribution. + * 3. Neither the names of the above-listed copyright holders nor the names + * of any contributors may be used to endorse or promote products derived + * from this software without specific prior written permission. + * + * Alternatively, this software may be distributed under the terms of the + * GNU General Public License ("GPL") version 2 as published by the Free + * Software Foundation. + * + * NO WARRANTY + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, + * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING + * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGES. + */ + + +#include <acpi/acpi.h> +#include <acpi/acnamesp.h> +#include <acpi/acparser.h> +#include <acpi/acdispat.h> + + +#define _COMPONENT ACPI_NAMESPACE + ACPI_MODULE_NAME ("nsparse") + + +/******************************************************************************* + * + * FUNCTION: ns_one_complete_parse + * + * PARAMETERS: pass_number - 1 or 2 + * table_desc - The table to be parsed. + * + * RETURN: Status + * + * DESCRIPTION: Perform one complete parse of an ACPI/AML table. + * + ******************************************************************************/ + +acpi_status +acpi_ns_one_complete_parse ( + u32 pass_number, + struct acpi_table_desc *table_desc) +{ + union acpi_parse_object *parse_root; + acpi_status status; + struct acpi_walk_state *walk_state; + + + ACPI_FUNCTION_TRACE ("ns_one_complete_parse"); + + + /* Create and init a Root Node */ + + parse_root = acpi_ps_create_scope_op (); + if (!parse_root) { + return_ACPI_STATUS (AE_NO_MEMORY); + } + + /* Create and initialize a new walk state */ + + walk_state = acpi_ds_create_walk_state (table_desc->table_id, + NULL, NULL, NULL); + if (!walk_state) { + acpi_ps_free_op (parse_root); + return_ACPI_STATUS (AE_NO_MEMORY); + } + + status = acpi_ds_init_aml_walk (walk_state, parse_root, NULL, + table_desc->aml_start, table_desc->aml_length, + NULL, pass_number); + if (ACPI_FAILURE (status)) { + acpi_ds_delete_walk_state (walk_state); + return_ACPI_STATUS (status); + } + + /* Parse the AML */ + + ACPI_DEBUG_PRINT ((ACPI_DB_PARSE, "*PARSE* pass %d parse\n", pass_number)); + status = acpi_ps_parse_aml (walk_state); + + acpi_ps_delete_parse_tree (parse_root); + return_ACPI_STATUS (status); +} + + +/******************************************************************************* + * + * FUNCTION: acpi_ns_parse_table + * + * PARAMETERS: table_desc - An ACPI table descriptor for table to parse + * start_node - Where to enter the table into the namespace + * + * RETURN: Status + * + * DESCRIPTION: Parse AML within an ACPI table and return a tree of ops + * + ******************************************************************************/ + +acpi_status +acpi_ns_parse_table ( + struct acpi_table_desc *table_desc, + struct acpi_namespace_node *start_node) +{ + acpi_status status; + + + ACPI_FUNCTION_TRACE ("ns_parse_table"); + + + /* + * AML Parse, pass 1 + * + * In this pass, we load most of the namespace. Control methods + * are not parsed until later. A parse tree is not created. Instead, + * each Parser Op subtree is deleted when it is finished. This saves + * a great deal of memory, and allows a small cache of parse objects + * to service the entire parse. The second pass of the parse then + * performs another complete parse of the AML.. + */ + status = acpi_ns_one_complete_parse (1, table_desc); + if (ACPI_FAILURE (status)) { + return_ACPI_STATUS (status); + } + + /* + * AML Parse, pass 2 + * + * In this pass, we resolve forward references and other things + * that could not be completed during the first pass. + * Another complete parse of the AML is performed, but the + * overhead of this is compensated for by the fact that the + * parse objects are all cached. + */ + status = acpi_ns_one_complete_parse (2, table_desc); + if (ACPI_FAILURE (status)) { + return_ACPI_STATUS (status); + } + + return_ACPI_STATUS (status); +} + + |