| |
| /****************************************************************************** |
| * |
| * Module Name: exresnte - AML Interpreter object resolution |
| * |
| *****************************************************************************/ |
| |
| /* |
| * Copyright (C) 2000 - 2006, 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/acdispat.h> |
| #include <acpi/acinterp.h> |
| #include <acpi/acnamesp.h> |
| #include <acpi/acparser.h> |
| #include <acpi/amlcode.h> |
| |
| #define _COMPONENT ACPI_EXECUTER |
| ACPI_MODULE_NAME("exresnte") |
| |
| /******************************************************************************* |
| * |
| * FUNCTION: acpi_ex_resolve_node_to_value |
| * |
| * PARAMETERS: object_ptr - Pointer to a location that contains |
| * a pointer to a NS node, and will receive a |
| * pointer to the resolved object. |
| * walk_state - Current state. Valid only if executing AML |
| * code. NULL if simply resolving an object |
| * |
| * RETURN: Status |
| * |
| * DESCRIPTION: Resolve a Namespace node to a valued object |
| * |
| * Note: for some of the data types, the pointer attached to the Node |
| * can be either a pointer to an actual internal object or a pointer into the |
| * AML stream itself. These types are currently: |
| * |
| * ACPI_TYPE_INTEGER |
| * ACPI_TYPE_STRING |
| * ACPI_TYPE_BUFFER |
| * ACPI_TYPE_MUTEX |
| * ACPI_TYPE_PACKAGE |
| * |
| ******************************************************************************/ |
| acpi_status |
| acpi_ex_resolve_node_to_value(struct acpi_namespace_node **object_ptr, |
| struct acpi_walk_state *walk_state) |
| { |
| acpi_status status = AE_OK; |
| union acpi_operand_object *source_desc; |
| union acpi_operand_object *obj_desc = NULL; |
| struct acpi_namespace_node *node; |
| acpi_object_type entry_type; |
| |
| ACPI_FUNCTION_TRACE("ex_resolve_node_to_value"); |
| |
| /* |
| * The stack pointer points to a struct acpi_namespace_node (Node). Get the |
| * object that is attached to the Node. |
| */ |
| node = *object_ptr; |
| source_desc = acpi_ns_get_attached_object(node); |
| entry_type = acpi_ns_get_type((acpi_handle) node); |
| |
| ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Entry=%p source_desc=%p [%s]\n", |
| node, source_desc, |
| acpi_ut_get_type_name(entry_type))); |
| |
| if ((entry_type == ACPI_TYPE_LOCAL_ALIAS) || |
| (entry_type == ACPI_TYPE_LOCAL_METHOD_ALIAS)) { |
| /* There is always exactly one level of indirection */ |
| |
| node = ACPI_CAST_PTR(struct acpi_namespace_node, node->object); |
| source_desc = acpi_ns_get_attached_object(node); |
| entry_type = acpi_ns_get_type((acpi_handle) node); |
| *object_ptr = node; |
| } |
| |
| /* |
| * Several object types require no further processing: |
| * 1) Devices rarely have an attached object, return the Node |
| * 2) Method locals and arguments have a pseudo-Node |
| */ |
| if (entry_type == ACPI_TYPE_DEVICE || |
| (node->flags & (ANOBJ_METHOD_ARG | ANOBJ_METHOD_LOCAL))) { |
| return_ACPI_STATUS(AE_OK); |
| } |
| |
| if (!source_desc) { |
| ACPI_REPORT_ERROR(("No object attached to node %p\n", node)); |
| return_ACPI_STATUS(AE_AML_NO_OPERAND); |
| } |
| |
| /* |
| * Action is based on the type of the Node, which indicates the type |
| * of the attached object or pointer |
| */ |
| switch (entry_type) { |
| case ACPI_TYPE_PACKAGE: |
| |
| if (ACPI_GET_OBJECT_TYPE(source_desc) != ACPI_TYPE_PACKAGE) { |
| ACPI_REPORT_ERROR(("Object not a Package, type %s\n", |
| acpi_ut_get_object_type_name |
| (source_desc))); |
| return_ACPI_STATUS(AE_AML_OPERAND_TYPE); |
| } |
| |
| status = acpi_ds_get_package_arguments(source_desc); |
| if (ACPI_SUCCESS(status)) { |
| /* Return an additional reference to the object */ |
| |
| obj_desc = source_desc; |
| acpi_ut_add_reference(obj_desc); |
| } |
| break; |
| |
| case ACPI_TYPE_BUFFER: |
| |
| if (ACPI_GET_OBJECT_TYPE(source_desc) != ACPI_TYPE_BUFFER) { |
| ACPI_REPORT_ERROR(("Object not a Buffer, type %s\n", |
| acpi_ut_get_object_type_name |
| (source_desc))); |
| return_ACPI_STATUS(AE_AML_OPERAND_TYPE); |
| } |
| |
| status = acpi_ds_get_buffer_arguments(source_desc); |
| if (ACPI_SUCCESS(status)) { |
| /* Return an additional reference to the object */ |
| |
| obj_desc = source_desc; |
| acpi_ut_add_reference(obj_desc); |
| } |
| break; |
| |
| case ACPI_TYPE_STRING: |
| |
| if (ACPI_GET_OBJECT_TYPE(source_desc) != ACPI_TYPE_STRING) { |
| ACPI_REPORT_ERROR(("Object not a String, type %s\n", |
| acpi_ut_get_object_type_name |
| (source_desc))); |
| return_ACPI_STATUS(AE_AML_OPERAND_TYPE); |
| } |
| |
| /* Return an additional reference to the object */ |
| |
| obj_desc = source_desc; |
| acpi_ut_add_reference(obj_desc); |
| break; |
| |
| case ACPI_TYPE_INTEGER: |
| |
| if (ACPI_GET_OBJECT_TYPE(source_desc) != ACPI_TYPE_INTEGER) { |
| ACPI_REPORT_ERROR(("Object not a Integer, type %s\n", |
| acpi_ut_get_object_type_name |
| (source_desc))); |
| return_ACPI_STATUS(AE_AML_OPERAND_TYPE); |
| } |
| |
| /* Return an additional reference to the object */ |
| |
| obj_desc = source_desc; |
| acpi_ut_add_reference(obj_desc); |
| break; |
| |
| case ACPI_TYPE_BUFFER_FIELD: |
| case ACPI_TYPE_LOCAL_REGION_FIELD: |
| case ACPI_TYPE_LOCAL_BANK_FIELD: |
| case ACPI_TYPE_LOCAL_INDEX_FIELD: |
| |
| ACPI_DEBUG_PRINT((ACPI_DB_EXEC, |
| "field_read Node=%p source_desc=%p Type=%X\n", |
| node, source_desc, entry_type)); |
| |
| status = |
| acpi_ex_read_data_from_field(walk_state, source_desc, |
| &obj_desc); |
| break; |
| |
| /* For these objects, just return the object attached to the Node */ |
| |
| case ACPI_TYPE_MUTEX: |
| case ACPI_TYPE_METHOD: |
| case ACPI_TYPE_POWER: |
| case ACPI_TYPE_PROCESSOR: |
| case ACPI_TYPE_THERMAL: |
| case ACPI_TYPE_EVENT: |
| case ACPI_TYPE_REGION: |
| |
| /* Return an additional reference to the object */ |
| |
| obj_desc = source_desc; |
| acpi_ut_add_reference(obj_desc); |
| break; |
| |
| /* TYPE_ANY is untyped, and thus there is no object associated with it */ |
| |
| case ACPI_TYPE_ANY: |
| |
| ACPI_REPORT_ERROR(("Untyped entry %p, no attached object!\n", |
| node)); |
| |
| return_ACPI_STATUS(AE_AML_OPERAND_TYPE); /* Cannot be AE_TYPE */ |
| |
| case ACPI_TYPE_LOCAL_REFERENCE: |
| |
| switch (source_desc->reference.opcode) { |
| case AML_LOAD_OP: |
| |
| /* This is a ddb_handle */ |
| /* Return an additional reference to the object */ |
| |
| obj_desc = source_desc; |
| acpi_ut_add_reference(obj_desc); |
| break; |
| |
| default: |
| /* No named references are allowed here */ |
| |
| ACPI_REPORT_ERROR(("Unsupported Reference opcode %X (%s)\n", source_desc->reference.opcode, acpi_ps_get_opcode_name(source_desc->reference.opcode))); |
| |
| return_ACPI_STATUS(AE_AML_OPERAND_TYPE); |
| } |
| break; |
| |
| default: |
| |
| /* Default case is for unknown types */ |
| |
| ACPI_REPORT_ERROR(("Node %p - Unknown object type %X\n", |
| node, entry_type)); |
| |
| return_ACPI_STATUS(AE_AML_OPERAND_TYPE); |
| |
| } /* switch (entry_type) */ |
| |
| /* Return the object descriptor */ |
| |
| *object_ptr = (void *)obj_desc; |
| return_ACPI_STATUS(status); |
| } |