292 lines
8.5 KiB
C
292 lines
8.5 KiB
C
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/******************************************************************************
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*
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* Module Name: exresnte - AML Interpreter object resolution
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*
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*****************************************************************************/
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/*
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* Copyright (C) 2000 - 2005, R. Byron Moore
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions, and the following disclaimer,
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* without modification.
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* 2. Redistributions in binary form must reproduce at minimum a disclaimer
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* substantially similar to the "NO WARRANTY" disclaimer below
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* ("Disclaimer") and any redistribution must be conditioned upon
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* including a substantially similar Disclaimer requirement for further
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* binary redistribution.
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* 3. Neither the names of the above-listed copyright holders nor the names
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* of any contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* NO WARRANTY
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGES.
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*/
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#include <acpi/acpi.h>
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#include <acpi/acdispat.h>
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#include <acpi/acinterp.h>
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#include <acpi/acnamesp.h>
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#include <acpi/acparser.h>
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#include <acpi/amlcode.h>
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#define _COMPONENT ACPI_EXECUTER
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ACPI_MODULE_NAME ("exresnte")
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/*******************************************************************************
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*
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* FUNCTION: acpi_ex_resolve_node_to_value
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*
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* PARAMETERS: object_ptr - Pointer to a location that contains
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* a pointer to a NS node, and will receive a
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* pointer to the resolved object.
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* walk_state - Current state. Valid only if executing AML
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* code. NULL if simply resolving an object
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*
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* RETURN: Status
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*
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* DESCRIPTION: Resolve a Namespace node to a valued object
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*
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* Note: for some of the data types, the pointer attached to the Node
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* can be either a pointer to an actual internal object or a pointer into the
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* AML stream itself. These types are currently:
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*
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* ACPI_TYPE_INTEGER
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* ACPI_TYPE_STRING
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* ACPI_TYPE_BUFFER
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* ACPI_TYPE_MUTEX
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* ACPI_TYPE_PACKAGE
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*
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******************************************************************************/
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acpi_status
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acpi_ex_resolve_node_to_value (
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struct acpi_namespace_node **object_ptr,
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struct acpi_walk_state *walk_state)
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{
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acpi_status status = AE_OK;
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union acpi_operand_object *source_desc;
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union acpi_operand_object *obj_desc = NULL;
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struct acpi_namespace_node *node;
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acpi_object_type entry_type;
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ACPI_FUNCTION_TRACE ("ex_resolve_node_to_value");
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/*
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* The stack pointer points to a struct acpi_namespace_node (Node). Get the
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* object that is attached to the Node.
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*/
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node = *object_ptr;
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source_desc = acpi_ns_get_attached_object (node);
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entry_type = acpi_ns_get_type ((acpi_handle) node);
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ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Entry=%p source_desc=%p [%s]\n",
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node, source_desc, acpi_ut_get_type_name (entry_type)));
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if ((entry_type == ACPI_TYPE_LOCAL_ALIAS) ||
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(entry_type == ACPI_TYPE_LOCAL_METHOD_ALIAS)) {
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/* There is always exactly one level of indirection */
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node = ACPI_CAST_PTR (struct acpi_namespace_node, node->object);
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source_desc = acpi_ns_get_attached_object (node);
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entry_type = acpi_ns_get_type ((acpi_handle) node);
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*object_ptr = node;
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}
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/*
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* Several object types require no further processing:
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* 1) Devices rarely have an attached object, return the Node
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* 2) Method locals and arguments have a pseudo-Node
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*/
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if (entry_type == ACPI_TYPE_DEVICE ||
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(node->flags & (ANOBJ_METHOD_ARG | ANOBJ_METHOD_LOCAL))) {
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return_ACPI_STATUS (AE_OK);
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}
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if (!source_desc) {
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ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "No object attached to node %p\n",
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node));
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return_ACPI_STATUS (AE_AML_NO_OPERAND);
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}
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/*
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* Action is based on the type of the Node, which indicates the type
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* of the attached object or pointer
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*/
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switch (entry_type) {
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case ACPI_TYPE_PACKAGE:
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if (ACPI_GET_OBJECT_TYPE (source_desc) != ACPI_TYPE_PACKAGE) {
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ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Object not a Package, type %s\n",
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acpi_ut_get_object_type_name (source_desc)));
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return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
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}
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status = acpi_ds_get_package_arguments (source_desc);
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if (ACPI_SUCCESS (status)) {
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/* Return an additional reference to the object */
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obj_desc = source_desc;
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acpi_ut_add_reference (obj_desc);
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}
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break;
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case ACPI_TYPE_BUFFER:
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if (ACPI_GET_OBJECT_TYPE (source_desc) != ACPI_TYPE_BUFFER) {
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ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Object not a Buffer, type %s\n",
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acpi_ut_get_object_type_name (source_desc)));
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return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
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}
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status = acpi_ds_get_buffer_arguments (source_desc);
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if (ACPI_SUCCESS (status)) {
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/* Return an additional reference to the object */
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obj_desc = source_desc;
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acpi_ut_add_reference (obj_desc);
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}
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break;
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case ACPI_TYPE_STRING:
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if (ACPI_GET_OBJECT_TYPE (source_desc) != ACPI_TYPE_STRING) {
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ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Object not a String, type %s\n",
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acpi_ut_get_object_type_name (source_desc)));
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return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
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}
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/* Return an additional reference to the object */
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obj_desc = source_desc;
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acpi_ut_add_reference (obj_desc);
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break;
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case ACPI_TYPE_INTEGER:
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if (ACPI_GET_OBJECT_TYPE (source_desc) != ACPI_TYPE_INTEGER) {
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ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Object not a Integer, type %s\n",
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acpi_ut_get_object_type_name (source_desc)));
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return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
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}
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/* Return an additional reference to the object */
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obj_desc = source_desc;
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acpi_ut_add_reference (obj_desc);
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break;
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case ACPI_TYPE_BUFFER_FIELD:
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case ACPI_TYPE_LOCAL_REGION_FIELD:
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case ACPI_TYPE_LOCAL_BANK_FIELD:
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case ACPI_TYPE_LOCAL_INDEX_FIELD:
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ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
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"field_read Node=%p source_desc=%p Type=%X\n",
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node, source_desc, entry_type));
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status = acpi_ex_read_data_from_field (walk_state, source_desc, &obj_desc);
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break;
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/* For these objects, just return the object attached to the Node */
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case ACPI_TYPE_MUTEX:
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case ACPI_TYPE_METHOD:
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case ACPI_TYPE_POWER:
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case ACPI_TYPE_PROCESSOR:
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case ACPI_TYPE_THERMAL:
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case ACPI_TYPE_EVENT:
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case ACPI_TYPE_REGION:
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/* Return an additional reference to the object */
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obj_desc = source_desc;
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acpi_ut_add_reference (obj_desc);
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break;
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/* TYPE_ANY is untyped, and thus there is no object associated with it */
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case ACPI_TYPE_ANY:
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ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
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"Untyped entry %p, no attached object!\n",
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node));
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return_ACPI_STATUS (AE_AML_OPERAND_TYPE); /* Cannot be AE_TYPE */
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case ACPI_TYPE_LOCAL_REFERENCE:
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switch (source_desc->reference.opcode) {
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case AML_LOAD_OP:
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/* This is a ddb_handle */
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/* Return an additional reference to the object */
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obj_desc = source_desc;
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acpi_ut_add_reference (obj_desc);
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break;
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default:
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/* No named references are allowed here */
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ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
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"Unsupported Reference opcode %X (%s)\n",
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source_desc->reference.opcode,
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acpi_ps_get_opcode_name (source_desc->reference.opcode)));
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return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
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}
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break;
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default:
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/* Default case is for unknown types */
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ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
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"Node %p - Unknown object type %X\n",
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node, entry_type));
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return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
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} /* switch (entry_type) */
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/* Return the object descriptor */
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*object_ptr = (void *) obj_desc;
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return_ACPI_STATUS (status);
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}
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