// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
/******************************************************************************
 *
 * Module Name: dswload2 - Dispatcher second pass namespace load callbacks
 *
 * Copyright (C) 2000 - 2018, Intel Corp.
 *
 *****************************************************************************/

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

#define _COMPONENT          ACPI_DISPATCHER
ACPI_MODULE_NAME("dswload2")

/*******************************************************************************
 *
 * FUNCTION:    acpi_ds_load2_begin_op
 *
 * PARAMETERS:  walk_state      - Current state of the parse tree walk
 *              out_op          - Wher to return op if a new one is created
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Descending callback used during the loading of ACPI tables.
 *
 ******************************************************************************/
acpi_status
acpi_ds_load2_begin_op(struct acpi_walk_state *walk_state,
                       union acpi_parse_object **out_op)
{
        union acpi_parse_object *op;
        struct acpi_namespace_node *node;
        acpi_status status;
        acpi_object_type object_type;
        char *buffer_ptr;
        u32 flags;

        ACPI_FUNCTION_TRACE(ds_load2_begin_op);

        op = walk_state->op;
        ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "Op=%p State=%p\n", op,
                          walk_state));

        if (op) {
                if ((walk_state->control_state) &&
                    (walk_state->control_state->common.state ==
                     ACPI_CONTROL_CONDITIONAL_EXECUTING)) {

                        /* We are executing a while loop outside of a method */

                        status = acpi_ds_exec_begin_op(walk_state, out_op);
                        return_ACPI_STATUS(status);
                }

                /* We only care about Namespace opcodes here */

                if ((!(walk_state->op_info->flags & AML_NSOPCODE) &&
                     (walk_state->opcode != AML_INT_NAMEPATH_OP)) ||
                    (!(walk_state->op_info->flags & AML_NAMED))) {
                        return_ACPI_STATUS(AE_OK);
                }

                /* Get the name we are going to enter or lookup in the namespace */

                if (walk_state->opcode == AML_INT_NAMEPATH_OP) {

                        /* For Namepath op, get the path string */

                        buffer_ptr = op->common.value.string;
                        if (!buffer_ptr) {

                                /* No name, just exit */

                                return_ACPI_STATUS(AE_OK);
                        }
                } else {
                        /* Get name from the op */

                        buffer_ptr = ACPI_CAST_PTR(char, &op->named.name);
                }
        } else {
                /* Get the namestring from the raw AML */

                buffer_ptr =
                    acpi_ps_get_next_namestring(&walk_state->parser_state);
        }

        /* Map the opcode into an internal object type */

        object_type = walk_state->op_info->object_type;

        ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
                          "State=%p Op=%p Type=%X\n", walk_state, op,
                          object_type));

        switch (walk_state->opcode) {
        case AML_FIELD_OP:
        case AML_BANK_FIELD_OP:
        case AML_INDEX_FIELD_OP:

                node = NULL;
                status = AE_OK;
                break;

        case AML_INT_NAMEPATH_OP:
                /*
                 * The name_path is an object reference to an existing object.
                 * Don't enter the name into the namespace, but look it up
                 * for use later.
                 */
                status =
                    acpi_ns_lookup(walk_state->scope_info, buffer_ptr,
                                   object_type, ACPI_IMODE_EXECUTE,
                                   ACPI_NS_SEARCH_PARENT, walk_state, &(node));
                break;

        case AML_SCOPE_OP:

                /* Special case for Scope(\) -> refers to the Root node */

                if (op && (op->named.node == acpi_gbl_root_node)) {
                        node = op->named.node;

                        status =
                            acpi_ds_scope_stack_push(node, object_type,
                                                     walk_state);
                        if (ACPI_FAILURE(status)) {
                                return_ACPI_STATUS(status);
                        }
                } else {
                        /*
                         * The Path is an object reference to an existing object.
                         * Don't enter the name into the namespace, but look it up
                         * for use later.
                         */
                        status =
                            acpi_ns_lookup(walk_state->scope_info, buffer_ptr,
                                           object_type, ACPI_IMODE_EXECUTE,
                                           ACPI_NS_SEARCH_PARENT, walk_state,
                                           &(node));
                        if (ACPI_FAILURE(status)) {
#ifdef ACPI_ASL_COMPILER
                                if (status == AE_NOT_FOUND) {
                                        status = AE_OK;
                                } else {
                                        ACPI_ERROR_NAMESPACE(walk_state->
                                                             scope_info,
                                                             buffer_ptr,
                                                             status);
                                }
#else
                                ACPI_ERROR_NAMESPACE(walk_state->scope_info,
                                                     buffer_ptr, status);
#endif
                                return_ACPI_STATUS(status);
                        }
                }

                /*
                 * We must check to make sure that the target is
                 * one of the opcodes that actually opens a scope
                 */
                switch (node->type) {
                case ACPI_TYPE_ANY:
                case ACPI_TYPE_LOCAL_SCOPE:     /* Scope */
                case ACPI_TYPE_DEVICE:
                case ACPI_TYPE_POWER:
                case ACPI_TYPE_PROCESSOR:
                case ACPI_TYPE_THERMAL:

                        /* These are acceptable types */
                        break;

                case ACPI_TYPE_INTEGER:
                case ACPI_TYPE_STRING:
                case ACPI_TYPE_BUFFER:

                        /*
                         * These types we will allow, but we will change the type.
                         * This enables some existing code of the form:
                         *
                         *  Name (DEB, 0)
                         *  Scope (DEB) { ... }
                         */
                        ACPI_WARNING((AE_INFO,
                                      "Type override - [%4.4s] had invalid type (%s) "
                                      "for Scope operator, changed to type ANY",
                                      acpi_ut_get_node_name(node),
                                      acpi_ut_get_type_name(node->type)));

                        node->type = ACPI_TYPE_ANY;
                        walk_state->scope_info->common.value = ACPI_TYPE_ANY;
                        break;

                case ACPI_TYPE_METHOD:

                        /*
                         * Allow scope change to root during execution of module-level
                         * code. Root is typed METHOD during this time.
                         */
                        if ((node == acpi_gbl_root_node) &&
                            (walk_state->
                             parse_flags & ACPI_PARSE_MODULE_LEVEL)) {
                                break;
                        }

                        /*lint -fallthrough */

                default:

                        /* All other types are an error */

                        ACPI_ERROR((AE_INFO,
                                    "Invalid type (%s) for target of "
                                    "Scope operator [%4.4s] (Cannot override)",
                                    acpi_ut_get_type_name(node->type),
                                    acpi_ut_get_node_name(node)));

                        return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
                }
                break;

        default:

                /* All other opcodes */

                if (op && op->common.node) {

                        /* This op/node was previously entered into the namespace */

                        node = op->common.node;

                        if (acpi_ns_opens_scope(object_type)) {
                                status =
                                    acpi_ds_scope_stack_push(node, object_type,
                                                             walk_state);
                                if (ACPI_FAILURE(status)) {
                                        return_ACPI_STATUS(status);
                                }
                        }

                        return_ACPI_STATUS(AE_OK);
                }

                /*
                 * Enter the named type into the internal namespace. We enter the name
                 * as we go downward in the parse tree. Any necessary subobjects that
                 * involve arguments to the opcode must be created as we go back up the
                 * parse tree later.
                 *
                 * Note: Name may already exist if we are executing a deferred opcode.
                 */
                if (walk_state->deferred_node) {

                        /* This name is already in the namespace, get the node */

                        node = walk_state->deferred_node;
                        status = AE_OK;
                        break;
                }

                flags = ACPI_NS_NO_UPSEARCH;
                if (walk_state->pass_number == ACPI_IMODE_EXECUTE) {

                        /* Execution mode, node cannot already exist, node is temporary */

                        flags |= ACPI_NS_ERROR_IF_FOUND;

                        if (!
                            (walk_state->
                             parse_flags & ACPI_PARSE_MODULE_LEVEL)) {
                                flags |= ACPI_NS_TEMPORARY;
                        }
                }
#ifdef ACPI_ASL_COMPILER

                /*
                 * Do not open a scope for AML_EXTERNAL_OP
                 * acpi_ns_lookup can open a new scope based on the object type
                 * of this op. AML_EXTERNAL_OP is a declaration rather than a
                 * definition. In the case that this external is a method object,
                 * acpi_ns_lookup will open a new scope. However, an AML_EXTERNAL_OP
                 * associated with the ACPI_TYPE_METHOD is a declaration, rather than
                 * a definition. Flags is set to avoid opening a scope for any
                 * AML_EXTERNAL_OP.
                 */
                if (walk_state->opcode == AML_EXTERNAL_OP) {
                        flags |= ACPI_NS_DONT_OPEN_SCOPE;
                }
#endif

                /* Add new entry or lookup existing entry */

                status =
                    acpi_ns_lookup(walk_state->scope_info, buffer_ptr,
                                   object_type, ACPI_IMODE_LOAD_PASS2, flags,
                                   walk_state, &node);

                if (ACPI_SUCCESS(status) && (flags & ACPI_NS_TEMPORARY)) {
                        ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
                                          "***New Node [%4.4s] %p is temporary\n",
                                          acpi_ut_get_node_name(node), node));
                }
                break;
        }

        if (ACPI_FAILURE(status)) {
                ACPI_ERROR_NAMESPACE(walk_state->scope_info,
                                     buffer_ptr, status);
                return_ACPI_STATUS(status);
        }

        if (!op) {

                /* Create a new op */

                op = acpi_ps_alloc_op(walk_state->opcode, walk_state->aml);
                if (!op) {
                        return_ACPI_STATUS(AE_NO_MEMORY);
                }

                /* Initialize the new op */

                if (node) {
                        op->named.name = node->name.integer;
                }
                *out_op = op;
        }

        /*
         * Put the Node in the "op" object that the parser uses, so we
         * can get it again quickly when this scope is closed
         */
        op->common.node = node;
        return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ds_load2_end_op
 *
 * PARAMETERS:  walk_state      - Current state of the parse tree walk
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Ascending callback used during the loading of the namespace,
 *              both control methods and everything else.
 *
 ******************************************************************************/

acpi_status acpi_ds_load2_end_op(struct acpi_walk_state *walk_state)
{
        union acpi_parse_object *op;
        acpi_status status = AE_OK;
        acpi_object_type object_type;
        struct acpi_namespace_node *node;
        union acpi_parse_object *arg;
        struct acpi_namespace_node *new_node;
#ifndef ACPI_NO_METHOD_EXECUTION
        u32 i;
        u8 region_space;
#endif

        ACPI_FUNCTION_TRACE(ds_load2_end_op);

        op = walk_state->op;
        ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "Opcode [%s] Op %p State %p\n",
                          walk_state->op_info->name, op, walk_state));

        /* Check if opcode had an associated namespace object */

        if (!(walk_state->op_info->flags & AML_NSOBJECT)) {
                return_ACPI_STATUS(AE_OK);
        }

        if (op->common.aml_opcode == AML_SCOPE_OP) {
                ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
                                  "Ending scope Op=%p State=%p\n", op,
                                  walk_state));
        }

        object_type = walk_state->op_info->object_type;

        /*
         * Get the Node/name from the earlier lookup
         * (It was saved in the *op structure)
         */
        node = op->common.node;

        /*
         * Put the Node on the object stack (Contains the ACPI Name of
         * this object)
         */
        walk_state->operands[0] = (void *)node;
        walk_state->num_operands = 1;

        /* Pop the scope stack */

        if (acpi_ns_opens_scope(object_type) &&
            (op->common.aml_opcode != AML_INT_METHODCALL_OP)) {
                ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
                                  "(%s) Popping scope for Op %p\n",
                                  acpi_ut_get_type_name(object_type), op));

                status = acpi_ds_scope_stack_pop(walk_state);
                if (ACPI_FAILURE(status)) {
                        goto cleanup;
                }
        }

        /*
         * Named operations are as follows:
         *
         * AML_ALIAS
         * AML_BANKFIELD
         * AML_CREATEBITFIELD
         * AML_CREATEBYTEFIELD
         * AML_CREATEDWORDFIELD
         * AML_CREATEFIELD
         * AML_CREATEQWORDFIELD
         * AML_CREATEWORDFIELD
         * AML_DATA_REGION
         * AML_DEVICE
         * AML_EVENT
         * AML_FIELD
         * AML_INDEXFIELD
         * AML_METHOD
         * AML_METHODCALL
         * AML_MUTEX
         * AML_NAME
         * AML_NAMEDFIELD
         * AML_OPREGION
         * AML_POWERRES
         * AML_PROCESSOR
         * AML_SCOPE
         * AML_THERMALZONE
         */

        ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
                          "Create-Load [%s] State=%p Op=%p NamedObj=%p\n",
                          acpi_ps_get_opcode_name(op->common.aml_opcode),
                          walk_state, op, node));

        /* Decode the opcode */

        arg = op->common.value.arg;

        switch (walk_state->op_info->type) {
#ifndef ACPI_NO_METHOD_EXECUTION

        case AML_TYPE_CREATE_FIELD:
                /*
                 * Create the field object, but the field buffer and index must
                 * be evaluated later during the execution phase
                 */
                status = acpi_ds_create_buffer_field(op, walk_state);
                break;

        case AML_TYPE_NAMED_FIELD:
                /*
                 * If we are executing a method, initialize the field
                 */
                if (walk_state->method_node) {
                        status = acpi_ds_init_field_objects(op, walk_state);
                }

                switch (op->common.aml_opcode) {
                case AML_INDEX_FIELD_OP:

                        status =
                            acpi_ds_create_index_field(op,
                                                       (acpi_handle)arg->common.
                                                       node, walk_state);
                        break;

                case AML_BANK_FIELD_OP:

                        status =
                            acpi_ds_create_bank_field(op, arg->common.node,
                                                      walk_state);
                        break;

                case AML_FIELD_OP:

                        status =
                            acpi_ds_create_field(op, arg->common.node,
                                                 walk_state);
                        break;

                default:

                        /* All NAMED_FIELD opcodes must be handled above */
                        break;
                }
                break;

        case AML_TYPE_NAMED_SIMPLE:

                status = acpi_ds_create_operands(walk_state, arg);
                if (ACPI_FAILURE(status)) {
                        goto cleanup;
                }

                switch (op->common.aml_opcode) {
                case AML_PROCESSOR_OP:

                        status = acpi_ex_create_processor(walk_state);
                        break;

                case AML_POWER_RESOURCE_OP:

                        status = acpi_ex_create_power_resource(walk_state);
                        break;

                case AML_MUTEX_OP:

                        status = acpi_ex_create_mutex(walk_state);
                        break;

                case AML_EVENT_OP:

                        status = acpi_ex_create_event(walk_state);
                        break;

                case AML_ALIAS_OP:

                        status = acpi_ex_create_alias(walk_state);
                        break;

                default:

                        /* Unknown opcode */

                        status = AE_OK;
                        goto cleanup;
                }

                /* Delete operands */

                for (i = 1; i < walk_state->num_operands; i++) {
                        acpi_ut_remove_reference(walk_state->operands[i]);
                        walk_state->operands[i] = NULL;
                }

                break;
#endif                          /* ACPI_NO_METHOD_EXECUTION */

        case AML_TYPE_NAMED_COMPLEX:

                switch (op->common.aml_opcode) {
#ifndef ACPI_NO_METHOD_EXECUTION
                case AML_REGION_OP:
                case AML_DATA_REGION_OP:

                        if (op->common.aml_opcode == AML_REGION_OP) {
                                region_space = (acpi_adr_space_type)
                                    ((op->common.value.arg)->common.value.
                                     integer);
                        } else {
                                region_space = ACPI_ADR_SPACE_DATA_TABLE;
                        }

                        /*
                         * The op_region is not fully parsed at this time. The only valid
                         * argument is the space_id. (We must save the address of the
                         * AML of the address and length operands)
                         *
                         * If we have a valid region, initialize it. The namespace is
                         * unlocked at this point.
                         *
                         * Need to unlock interpreter if it is locked (if we are running
                         * a control method), in order to allow _REG methods to be run
                         * during acpi_ev_initialize_region.
                         */
                        if (walk_state->method_node) {
                                /*
                                 * Executing a method: initialize the region and unlock
                                 * the interpreter
                                 */
                                status = acpi_ex_create_region(op->named.data,
                                                               op->named.length,
                                                               region_space,
                                                               walk_state);
                                if (ACPI_FAILURE(status)) {
                                        return_ACPI_STATUS(status);
                                }
                        }

                        status =
                            acpi_ev_initialize_region
                            (acpi_ns_get_attached_object(node));
                        break;

                case AML_NAME_OP:

                        status = acpi_ds_create_node(walk_state, node, op);
                        break;

                case AML_METHOD_OP:
                        /*
                         * method_op pkg_length name_string method_flags term_list
                         *
                         * Note: We must create the method node/object pair as soon as we
                         * see the method declaration. This allows later pass1 parsing
                         * of invocations of the method (need to know the number of
                         * arguments.)
                         */
                        ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
                                          "LOADING-Method: State=%p Op=%p NamedObj=%p\n",
                                          walk_state, op, op->named.node));

                        if (!acpi_ns_get_attached_object(op->named.node)) {
                                walk_state->operands[0] =
                                    ACPI_CAST_PTR(void, op->named.node);
                                walk_state->num_operands = 1;

                                status =
                                    acpi_ds_create_operands(walk_state,
                                                            op->common.value.
                                                            arg);
                                if (ACPI_SUCCESS(status)) {
                                        status =
                                            acpi_ex_create_method(op->named.
                                                                  data,
                                                                  op->named.
                                                                  length,
                                                                  walk_state);
                                }

                                walk_state->operands[0] = NULL;
                                walk_state->num_operands = 0;

                                if (ACPI_FAILURE(status)) {
                                        return_ACPI_STATUS(status);
                                }
                        }
                        break;

#endif                          /* ACPI_NO_METHOD_EXECUTION */

                default:

                        /* All NAMED_COMPLEX opcodes must be handled above */
                        break;
                }
                break;

        case AML_CLASS_INTERNAL:

                /* case AML_INT_NAMEPATH_OP: */
                break;

        case AML_CLASS_METHOD_CALL:

                ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
                                  "RESOLVING-MethodCall: State=%p Op=%p NamedObj=%p\n",
                                  walk_state, op, node));

                /*
                 * Lookup the method name and save the Node
                 */
                status =
                    acpi_ns_lookup(walk_state->scope_info,
                                   arg->common.value.string, ACPI_TYPE_ANY,
                                   ACPI_IMODE_LOAD_PASS2,
                                   ACPI_NS_SEARCH_PARENT |
                                   ACPI_NS_DONT_OPEN_SCOPE, walk_state,
                                   &(new_node));
                if (ACPI_SUCCESS(status)) {
                        /*
                         * Make sure that what we found is indeed a method
                         * We didn't search for a method on purpose, to see if the name
                         * would resolve
                         */
                        if (new_node->type != ACPI_TYPE_METHOD) {
                                status = AE_AML_OPERAND_TYPE;
                        }

                        /* We could put the returned object (Node) on the object stack for
                         * later, but for now, we will put it in the "op" object that the
                         * parser uses, so we can get it again at the end of this scope
                         */
                        op->common.node = new_node;
                } else {
                        ACPI_ERROR_NAMESPACE(walk_state->scope_info,
                                             arg->common.value.string, status);
                }
                break;

        default:

                break;
        }

cleanup:

        /* Remove the Node pushed at the very beginning */

        walk_state->operands[0] = NULL;
        walk_state->num_operands = 0;
        return_ACPI_STATUS(status);
}