208 lines
6.6 KiB
C
208 lines
6.6 KiB
C
/******************************************************************************
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*
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* Module Name: nsparse - namespace interface to AML parser
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*
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*****************************************************************************/
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/*
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* Copyright (C) 2000 - 2015, Intel Corp.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions, and the following disclaimer,
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* without modification.
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* 2. Redistributions in binary form must reproduce at minimum a disclaimer
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* substantially similar to the "NO WARRANTY" disclaimer below
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* ("Disclaimer") and any redistribution must be conditioned upon
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* including a substantially similar Disclaimer requirement for further
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* binary redistribution.
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* 3. Neither the names of the above-listed copyright holders nor the names
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* of any contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* NO WARRANTY
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGES.
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*/
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#include <acpi/acpi.h>
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#include "accommon.h"
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#include "acnamesp.h"
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#include "acparser.h"
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#include "acdispat.h"
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#include "actables.h"
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#define _COMPONENT ACPI_NAMESPACE
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ACPI_MODULE_NAME("nsparse")
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/*******************************************************************************
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*
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* FUNCTION: ns_one_complete_parse
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*
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* PARAMETERS: pass_number - 1 or 2
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* table_desc - The table to be parsed.
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*
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* RETURN: Status
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*
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* DESCRIPTION: Perform one complete parse of an ACPI/AML table.
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*
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******************************************************************************/
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acpi_status
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acpi_ns_one_complete_parse(u32 pass_number,
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u32 table_index,
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struct acpi_namespace_node *start_node)
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{
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union acpi_parse_object *parse_root;
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acpi_status status;
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u32 aml_length;
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u8 *aml_start;
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struct acpi_walk_state *walk_state;
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struct acpi_table_header *table;
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acpi_owner_id owner_id;
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ACPI_FUNCTION_TRACE(ns_one_complete_parse);
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status = acpi_get_table_by_index(table_index, &table);
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if (ACPI_FAILURE(status)) {
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return_ACPI_STATUS(status);
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}
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/* Table must consist of at least a complete header */
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if (table->length < sizeof(struct acpi_table_header)) {
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return_ACPI_STATUS(AE_BAD_HEADER);
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}
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aml_start = (u8 *)table + sizeof(struct acpi_table_header);
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aml_length = table->length - sizeof(struct acpi_table_header);
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status = acpi_tb_get_owner_id(table_index, &owner_id);
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if (ACPI_FAILURE(status)) {
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return_ACPI_STATUS(status);
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}
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/* Create and init a Root Node */
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parse_root = acpi_ps_create_scope_op(aml_start);
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if (!parse_root) {
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return_ACPI_STATUS(AE_NO_MEMORY);
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}
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/* Create and initialize a new walk state */
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walk_state = acpi_ds_create_walk_state(owner_id, NULL, NULL, NULL);
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if (!walk_state) {
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acpi_ps_free_op(parse_root);
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return_ACPI_STATUS(AE_NO_MEMORY);
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}
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status = acpi_ds_init_aml_walk(walk_state, parse_root, NULL,
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aml_start, aml_length, NULL,
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(u8)pass_number);
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if (ACPI_FAILURE(status)) {
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acpi_ds_delete_walk_state(walk_state);
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goto cleanup;
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}
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/* Found OSDT table, enable the namespace override feature */
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if (ACPI_COMPARE_NAME(table->signature, ACPI_SIG_OSDT) &&
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pass_number == ACPI_IMODE_LOAD_PASS1) {
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walk_state->namespace_override = TRUE;
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}
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/* start_node is the default location to load the table */
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if (start_node && start_node != acpi_gbl_root_node) {
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status =
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acpi_ds_scope_stack_push(start_node, ACPI_TYPE_METHOD,
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walk_state);
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if (ACPI_FAILURE(status)) {
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acpi_ds_delete_walk_state(walk_state);
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goto cleanup;
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}
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}
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/* Parse the AML */
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ACPI_DEBUG_PRINT((ACPI_DB_PARSE, "*PARSE* pass %u parse\n",
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pass_number));
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status = acpi_ps_parse_aml(walk_state);
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cleanup:
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acpi_ps_delete_parse_tree(parse_root);
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return_ACPI_STATUS(status);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ns_parse_table
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*
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* PARAMETERS: table_desc - An ACPI table descriptor for table to parse
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* start_node - Where to enter the table into the namespace
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*
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* RETURN: Status
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*
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* DESCRIPTION: Parse AML within an ACPI table and return a tree of ops
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*
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******************************************************************************/
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acpi_status
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acpi_ns_parse_table(u32 table_index, struct acpi_namespace_node *start_node)
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{
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acpi_status status;
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ACPI_FUNCTION_TRACE(ns_parse_table);
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/*
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* AML Parse, pass 1
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*
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* In this pass, we load most of the namespace. Control methods
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* are not parsed until later. A parse tree is not created. Instead,
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* each Parser Op subtree is deleted when it is finished. This saves
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* a great deal of memory, and allows a small cache of parse objects
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* to service the entire parse. The second pass of the parse then
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* performs another complete parse of the AML.
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*/
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ACPI_DEBUG_PRINT((ACPI_DB_PARSE, "**** Start pass 1\n"));
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status = acpi_ns_one_complete_parse(ACPI_IMODE_LOAD_PASS1,
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table_index, start_node);
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if (ACPI_FAILURE(status)) {
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return_ACPI_STATUS(status);
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}
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/*
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* AML Parse, pass 2
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*
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* In this pass, we resolve forward references and other things
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* that could not be completed during the first pass.
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* Another complete parse of the AML is performed, but the
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* overhead of this is compensated for by the fact that the
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* parse objects are all cached.
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*/
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ACPI_DEBUG_PRINT((ACPI_DB_PARSE, "**** Start pass 2\n"));
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status = acpi_ns_one_complete_parse(ACPI_IMODE_LOAD_PASS2,
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table_index, start_node);
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if (ACPI_FAILURE(status)) {
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return_ACPI_STATUS(status);
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}
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return_ACPI_STATUS(status);
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}
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