/****************************************************************************** * * Module Name: exresnte - AML Interpreter object resolution * *****************************************************************************/ /* * Copyright (C) 2000 - 2005, 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_DEBUG_PRINT ((ACPI_DB_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_DEBUG_PRINT ((ACPI_DB_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_DEBUG_PRINT ((ACPI_DB_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_DEBUG_PRINT ((ACPI_DB_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_DEBUG_PRINT ((ACPI_DB_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_DEBUG_PRINT ((ACPI_DB_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_DEBUG_PRINT ((ACPI_DB_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 case is for unknown types */ default: ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Node %p - Unknown object type %X\n", node, entry_type)); return_ACPI_STATUS (AE_AML_OPERAND_TYPE); } /* switch (entry_type) */ /* Put the object descriptor on the stack */ *object_ptr = (void *) obj_desc; return_ACPI_STATUS (status); }