302 lines
8.6 KiB
C
302 lines
8.6 KiB
C
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// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
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/******************************************************************************
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*
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* Module Name: nsparse - namespace interface to AML parser
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*
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* Copyright (C) 2000 - 2018, Intel Corp.
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*
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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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#include "acinterp.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_execute_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: Load ACPI/AML table by executing the entire table as a single
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* large control method.
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*
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* NOTE: The point of this is to execute any module-level code in-place
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* as the table is parsed. Some AML code depends on this behavior.
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*
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* It is a run-time option at this time, but will eventually become
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* the default.
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*
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* Note: This causes the table to only have a single-pass parse.
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* However, this is compatible with other ACPI implementations.
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*
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******************************************************************************/
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acpi_status
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acpi_ns_execute_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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struct acpi_table_header *table;
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acpi_owner_id owner_id;
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struct acpi_evaluate_info *info = NULL;
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u32 aml_length;
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u8 *aml_start;
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union acpi_operand_object *method_obj = NULL;
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ACPI_FUNCTION_TRACE(ns_execute_table);
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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, initialize, and link a new temporary method object */
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method_obj = acpi_ut_create_internal_object(ACPI_TYPE_METHOD);
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if (!method_obj) {
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return_ACPI_STATUS(AE_NO_MEMORY);
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}
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/* Allocate the evaluation information block */
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info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info));
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if (!info) {
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status = AE_NO_MEMORY;
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goto cleanup;
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}
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ACPI_DEBUG_PRINT_RAW((ACPI_DB_PARSE,
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"%s: Create table pseudo-method for [%4.4s] @%p, method %p\n",
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ACPI_GET_FUNCTION_NAME, table->signature, table,
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method_obj));
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method_obj->method.aml_start = aml_start;
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method_obj->method.aml_length = aml_length;
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method_obj->method.owner_id = owner_id;
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method_obj->method.info_flags |= ACPI_METHOD_MODULE_LEVEL;
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info->pass_number = ACPI_IMODE_EXECUTE;
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info->node = start_node;
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info->obj_desc = method_obj;
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info->node_flags = info->node->flags;
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info->full_pathname = acpi_ns_get_normalized_pathname(info->node, TRUE);
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if (!info->full_pathname) {
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status = AE_NO_MEMORY;
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goto cleanup;
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}
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status = acpi_ps_execute_table(info);
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cleanup:
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if (info) {
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ACPI_FREE(info->full_pathname);
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info->full_pathname = NULL;
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}
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ACPI_FREE(info);
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acpi_ut_remove_reference(method_obj);
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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: 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,
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"*PARSE* pass %u parse\n", pass_number));
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acpi_ex_enter_interpreter();
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status = acpi_ps_parse_aml(walk_state);
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acpi_ex_exit_interpreter();
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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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if (acpi_gbl_execute_tables_as_methods) {
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/*
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* This case executes the AML table as one large control method.
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* The point of this is to execute any module-level code in-place
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* as the table is parsed. Some AML code depends on this behavior.
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*
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* It is a run-time option at this time, but will eventually become
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* the default.
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*
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* Note: This causes the table to only have a single-pass parse.
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* However, this is compatible with other ACPI implementations.
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*/
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ACPI_DEBUG_PRINT_RAW((ACPI_DB_PARSE,
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"%s: **** Start table execution pass\n",
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ACPI_GET_FUNCTION_NAME));
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status = acpi_ns_execute_table(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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} else {
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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.
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* Instead, each Parser Op subtree is deleted when it is finished.
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* This saves a great deal of memory, and allows a small cache of
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* parse objects to service the entire parse. The second pass of
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* the parse then 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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}
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return_ACPI_STATUS(status);
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}
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