// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
/******************************************************************************
 *
 * Module Name: nsparse - namespace interface to AML parser
 *
 * Copyright (C) 2000 - 2025, Intel Corp.
 *
 *****************************************************************************/

#include <acpi/acpi.h>
#include "accommon.h"
#include "acnamesp.h"
#include "acparser.h"
#include "acdispat.h"
#include "actables.h"
#include "acinterp.h"

#define _COMPONENT          ACPI_NAMESPACE
ACPI_MODULE_NAME("nsparse")

/*******************************************************************************
 *
 * FUNCTION:    ns_execute_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: Load ACPI/AML table by executing the entire table as a single
 *              large control method.
 *
 * NOTE: The point of this is to execute any module-level code in-place
 * as the table is parsed. Some AML code depends on this behavior.
 *
 * It is a run-time option at this time, but will eventually become
 * the default.
 *
 * Note: This causes the table to only have a single-pass parse.
 * However, this is compatible with other ACPI implementations.
 *
 ******************************************************************************/
acpi_status
acpi_ns_execute_table(u32 table_index, struct acpi_namespace_node *start_node)
{
        acpi_status status;
        struct acpi_table_header *table;
        acpi_owner_id owner_id;
        struct acpi_evaluate_info *info = NULL;
        u32 aml_length;
        u8 *aml_start;
        union acpi_operand_object *method_obj = NULL;

        ACPI_FUNCTION_TRACE(ns_execute_table);

        status = acpi_get_table_by_index(table_index, &table);
        if (ACPI_FAILURE(status)) {
                return_ACPI_STATUS(status);
        }

        /* Table must consist of at least a complete header */

        if (table->length < sizeof(struct acpi_table_header)) {
                return_ACPI_STATUS(AE_BAD_HEADER);
        }

        aml_start = (u8 *)table + sizeof(struct acpi_table_header);
        aml_length = table->length - sizeof(struct acpi_table_header);

        status = acpi_tb_get_owner_id(table_index, &owner_id);
        if (ACPI_FAILURE(status)) {
                return_ACPI_STATUS(status);
        }

        /* Create, initialize, and link a new temporary method object */

        method_obj = acpi_ut_create_internal_object(ACPI_TYPE_METHOD);
        if (!method_obj) {
                return_ACPI_STATUS(AE_NO_MEMORY);
        }

        /* Allocate the evaluation information block */

        info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info));
        if (!info) {
                status = AE_NO_MEMORY;
                goto cleanup;
        }

        ACPI_DEBUG_PRINT_RAW((ACPI_DB_PARSE,
                              "%s: Create table pseudo-method for [%4.4s] @%p, method %p\n",
                              ACPI_GET_FUNCTION_NAME, table->signature, table,
                              method_obj));

        method_obj->method.aml_start = aml_start;
        method_obj->method.aml_length = aml_length;
        method_obj->method.owner_id = owner_id;
        method_obj->method.info_flags |= ACPI_METHOD_MODULE_LEVEL;

        info->pass_number = ACPI_IMODE_EXECUTE;
        info->node = start_node;
        info->obj_desc = method_obj;
        info->node_flags = info->node->flags;
        info->full_pathname = acpi_ns_get_normalized_pathname(info->node, TRUE);
        if (!info->full_pathname) {
                status = AE_NO_MEMORY;
                goto cleanup;
        }

        /* Optional object evaluation log */

        ACPI_DEBUG_PRINT_RAW((ACPI_DB_EVALUATION,
                              "%-26s:  (Definition Block level)\n",
                              "Module-level evaluation"));

        status = acpi_ps_execute_table(info);

        /* Optional object evaluation log */

        ACPI_DEBUG_PRINT_RAW((ACPI_DB_EVALUATION,
                              "%-26s:  (Definition Block level)\n",
                              "Module-level complete"));

cleanup:
        if (info) {
                ACPI_FREE(info->full_pathname);
                info->full_pathname = NULL;
        }
        ACPI_FREE(info);
        acpi_ut_remove_reference(method_obj);
        return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * 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,
                           u32 table_index,
                           struct acpi_namespace_node *start_node)
{
        union acpi_parse_object *parse_root;
        acpi_status status;
        u32 aml_length;
        u8 *aml_start;
        struct acpi_walk_state *walk_state;
        struct acpi_table_header *table;
        acpi_owner_id owner_id;

        ACPI_FUNCTION_TRACE(ns_one_complete_parse);

        status = acpi_get_table_by_index(table_index, &table);
        if (ACPI_FAILURE(status)) {
                return_ACPI_STATUS(status);
        }

        /* Table must consist of at least a complete header */

        if (table->length < sizeof(struct acpi_table_header)) {
                return_ACPI_STATUS(AE_BAD_HEADER);
        }

        aml_start = (u8 *)table + sizeof(struct acpi_table_header);
        aml_length = table->length - sizeof(struct acpi_table_header);

        status = acpi_tb_get_owner_id(table_index, &owner_id);
        if (ACPI_FAILURE(status)) {
                return_ACPI_STATUS(status);
        }

        /* Create and init a Root Node */

        parse_root = acpi_ps_create_scope_op(aml_start);
        if (!parse_root) {
                return_ACPI_STATUS(AE_NO_MEMORY);
        }

        /* Create and initialize a new walk state */

        walk_state = acpi_ds_create_walk_state(owner_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,
                                       aml_start, aml_length, NULL,
                                       (u8)pass_number);
        if (ACPI_FAILURE(status)) {
                acpi_ds_delete_walk_state(walk_state);
                goto cleanup;
        }

        /* Found OSDT table, enable the namespace override feature */

        if (ACPI_COMPARE_NAMESEG(table->signature, ACPI_SIG_OSDT) &&
            pass_number == ACPI_IMODE_LOAD_PASS1) {
                walk_state->namespace_override = TRUE;
        }

        /* start_node is the default location to load the table */

        if (start_node && start_node != acpi_gbl_root_node) {
                status =
                    acpi_ds_scope_stack_push(start_node, ACPI_TYPE_METHOD,
                                             walk_state);
                if (ACPI_FAILURE(status)) {
                        acpi_ds_delete_walk_state(walk_state);
                        goto cleanup;
                }
        }

        /* Parse the AML */

        ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
                          "*PARSE* pass %u parse\n", pass_number));
        acpi_ex_enter_interpreter();
        status = acpi_ps_parse_aml(walk_state);
        acpi_ex_exit_interpreter();

cleanup:
        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(u32 table_index, struct acpi_namespace_node *start_node)
{
        acpi_status status;

        ACPI_FUNCTION_TRACE(ns_parse_table);

        /*
         * Executes the AML table as one large control method.
         * The point of this is to execute any module-level code in-place
         * as the table is parsed. Some AML code depends on this behavior.
         *
         * Note: This causes the table to only have a single-pass parse.
         * However, this is compatible with other ACPI implementations.
         */
        ACPI_DEBUG_PRINT_RAW((ACPI_DB_PARSE,
                              "%s: **** Start table execution pass\n",
                              ACPI_GET_FUNCTION_NAME));

        status = acpi_ns_execute_table(table_index, start_node);

        return_ACPI_STATUS(status);
}