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marcus.erl |
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/******************************************************************************
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*
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* Module Name: exstoren - AML Interpreter object store support,
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* Store to Node (namespace object)
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*
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*****************************************************************************/
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/*
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* Copyright (C) 2000 - 2007, 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/acinterp.h>
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#include <acpi/amlcode.h>
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#define _COMPONENT ACPI_EXECUTER
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ACPI_MODULE_NAME("exstoren")
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/*******************************************************************************
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*
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* FUNCTION: acpi_ex_resolve_object
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*
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* PARAMETERS: source_desc_ptr - Pointer to the source object
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* target_type - Current type of the target
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* walk_state - Current walk state
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*
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* RETURN: Status, resolved object in source_desc_ptr.
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*
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* DESCRIPTION: Resolve an object. If the object is a reference, dereference
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* it and return the actual object in the source_desc_ptr.
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*
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******************************************************************************/
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acpi_status
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acpi_ex_resolve_object(union acpi_operand_object **source_desc_ptr,
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acpi_object_type target_type,
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struct acpi_walk_state *walk_state)
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{
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union acpi_operand_object *source_desc = *source_desc_ptr;
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acpi_status status = AE_OK;
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ACPI_FUNCTION_TRACE(ex_resolve_object);
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/* Ensure we have a Target that can be stored to */
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switch (target_type) {
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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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/*
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* These cases all require only Integers or values that
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* can be converted to Integers (Strings or Buffers)
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*/
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case ACPI_TYPE_INTEGER:
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case ACPI_TYPE_STRING:
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case ACPI_TYPE_BUFFER:
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/*
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* Stores into a Field/Region or into a Integer/Buffer/String
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* are all essentially the same. This case handles the
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* "interchangeable" types Integer, String, and Buffer.
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*/
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if (ACPI_GET_OBJECT_TYPE(source_desc) ==
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ACPI_TYPE_LOCAL_REFERENCE) {
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/* Resolve a reference object first */
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status =
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acpi_ex_resolve_to_value(source_desc_ptr,
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walk_state);
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if (ACPI_FAILURE(status)) {
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break;
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}
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}
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/* For copy_object, no further validation necessary */
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if (walk_state->opcode == AML_COPY_OP) {
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break;
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}
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/* Must have a Integer, Buffer, or String */
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if ((ACPI_GET_OBJECT_TYPE(source_desc) != ACPI_TYPE_INTEGER) &&
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(ACPI_GET_OBJECT_TYPE(source_desc) != ACPI_TYPE_BUFFER) &&
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(ACPI_GET_OBJECT_TYPE(source_desc) != ACPI_TYPE_STRING) &&
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!((ACPI_GET_OBJECT_TYPE(source_desc) ==
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ACPI_TYPE_LOCAL_REFERENCE)
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&& (source_desc->reference.opcode == AML_LOAD_OP))) {
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/* Conversion successful but still not a valid type */
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ACPI_ERROR((AE_INFO,
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"Cannot assign type %s to %s (must be type Int/Str/Buf)",
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acpi_ut_get_object_type_name(source_desc),
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acpi_ut_get_type_name(target_type)));
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status = AE_AML_OPERAND_TYPE;
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}
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break;
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case ACPI_TYPE_LOCAL_ALIAS:
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case ACPI_TYPE_LOCAL_METHOD_ALIAS:
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/*
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* All aliases should have been resolved earlier, during the
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* operand resolution phase.
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*/
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ACPI_ERROR((AE_INFO, "Store into an unresolved Alias object"));
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status = AE_AML_INTERNAL;
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break;
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case ACPI_TYPE_PACKAGE:
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default:
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/*
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* All other types than Alias and the various Fields come here,
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* including the untyped case - ACPI_TYPE_ANY.
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*/
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break;
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}
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return_ACPI_STATUS(status);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ex_store_object_to_object
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*
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* PARAMETERS: source_desc - Object to store
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* dest_desc - Object to receive a copy of the source
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* new_desc - New object if dest_desc is obsoleted
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* walk_state - Current walk state
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*
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* RETURN: Status
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*
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* DESCRIPTION: "Store" an object to another object. This may include
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* converting the source type to the target type (implicit
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* conversion), and a copy of the value of the source to
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* the target.
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*
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* The Assignment of an object to another (not named) object
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* is handled here.
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* The Source passed in will replace the current value (if any)
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* with the input value.
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*
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* When storing into an object the data is converted to the
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* target object type then stored in the object. This means
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* that the target object type (for an initialized target) will
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* not be changed by a store operation.
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*
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* This module allows destination types of Number, String,
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* Buffer, and Package.
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*
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* Assumes parameters are already validated. NOTE: source_desc
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* resolution (from a reference object) must be performed by
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* the caller if necessary.
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*
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******************************************************************************/
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acpi_status
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acpi_ex_store_object_to_object(union acpi_operand_object *source_desc,
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union acpi_operand_object *dest_desc,
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union acpi_operand_object **new_desc,
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struct acpi_walk_state *walk_state)
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{
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union acpi_operand_object *actual_src_desc;
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acpi_status status = AE_OK;
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ACPI_FUNCTION_TRACE_PTR(ex_store_object_to_object, source_desc);
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actual_src_desc = source_desc;
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if (!dest_desc) {
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/*
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* There is no destination object (An uninitialized node or
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* package element), so we can simply copy the source object
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* creating a new destination object
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*/
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status =
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acpi_ut_copy_iobject_to_iobject(actual_src_desc, new_desc,
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walk_state);
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return_ACPI_STATUS(status);
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}
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if (ACPI_GET_OBJECT_TYPE(source_desc) !=
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ACPI_GET_OBJECT_TYPE(dest_desc)) {
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/*
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* The source type does not match the type of the destination.
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* Perform the "implicit conversion" of the source to the current type
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* of the target as per the ACPI specification.
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*
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* If no conversion performed, actual_src_desc = source_desc.
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* Otherwise, actual_src_desc is a temporary object to hold the
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* converted object.
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*/
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status =
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acpi_ex_convert_to_target_type(ACPI_GET_OBJECT_TYPE
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(dest_desc), source_desc,
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&actual_src_desc,
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walk_state);
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if (ACPI_FAILURE(status)) {
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return_ACPI_STATUS(status);
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}
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if (source_desc == actual_src_desc) {
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/*
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* No conversion was performed. Return the source_desc as the
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* new object.
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*/
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*new_desc = source_desc;
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return_ACPI_STATUS(AE_OK);
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}
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}
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/*
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* We now have two objects of identical types, and we can perform a
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* copy of the *value* of the source object.
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*/
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switch (ACPI_GET_OBJECT_TYPE(dest_desc)) {
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case ACPI_TYPE_INTEGER:
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dest_desc->integer.value = actual_src_desc->integer.value;
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/* Truncate value if we are executing from a 32-bit ACPI table */
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acpi_ex_truncate_for32bit_table(dest_desc);
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break;
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case ACPI_TYPE_STRING:
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status =
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acpi_ex_store_string_to_string(actual_src_desc, dest_desc);
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break;
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case ACPI_TYPE_BUFFER:
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status =
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acpi_ex_store_buffer_to_buffer(actual_src_desc, dest_desc);
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break;
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case ACPI_TYPE_PACKAGE:
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status =
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acpi_ut_copy_iobject_to_iobject(actual_src_desc, &dest_desc,
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walk_state);
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break;
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default:
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/*
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* All other types come here.
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*/
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ACPI_WARNING((AE_INFO, "Store into type %s not implemented",
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acpi_ut_get_object_type_name(dest_desc)));
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status = AE_NOT_IMPLEMENTED;
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break;
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}
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if (actual_src_desc != source_desc) {
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/* Delete the intermediate (temporary) source object */
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acpi_ut_remove_reference(actual_src_desc);
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}
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*new_desc = dest_desc;
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return_ACPI_STATUS(status);
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}
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