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linux/drivers/acpi/executer/exstoren.c
Bob Moore 1044f1f65b ACPICA: Cleanup for internal Reference Object 
Fix some sloppiness in the Reference object. No longer use AML
opcodes to differentiate the types, introduce new reference
Class. Cleanup the debug output code.

Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Lin Ming <ming.m.lin@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
2008-10-22 23:14:45 -04:00

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/******************************************************************************
*
* Module Name: exstoren - AML Interpreter object store support,
* Store to Node (namespace object)
*
*****************************************************************************/
/*
* Copyright (C) 2000 - 2008, Intel Corp.
* 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/acinterp.h>
#include <acpi/amlcode.h>
#define _COMPONENT ACPI_EXECUTER
ACPI_MODULE_NAME("exstoren")
/*******************************************************************************
*
* FUNCTION: acpi_ex_resolve_object
*
* PARAMETERS: source_desc_ptr - Pointer to the source object
* target_type - Current type of the target
* walk_state - Current walk state
*
* RETURN: Status, resolved object in source_desc_ptr.
*
* DESCRIPTION: Resolve an object. If the object is a reference, dereference
* it and return the actual object in the source_desc_ptr.
*
******************************************************************************/
acpi_status
acpi_ex_resolve_object(union acpi_operand_object **source_desc_ptr,
acpi_object_type target_type,
struct acpi_walk_state *walk_state)
{
union acpi_operand_object *source_desc = *source_desc_ptr;
acpi_status status = AE_OK;
ACPI_FUNCTION_TRACE(ex_resolve_object);
/* Ensure we have a Target that can be stored to */
switch (target_type) {
case ACPI_TYPE_BUFFER_FIELD:
case ACPI_TYPE_LOCAL_REGION_FIELD:
case ACPI_TYPE_LOCAL_BANK_FIELD:
case ACPI_TYPE_LOCAL_INDEX_FIELD:
/*
* These cases all require only Integers or values that
* can be converted to Integers (Strings or Buffers)
*/
case ACPI_TYPE_INTEGER:
case ACPI_TYPE_STRING:
case ACPI_TYPE_BUFFER:
/*
* Stores into a Field/Region or into a Integer/Buffer/String
* are all essentially the same. This case handles the
* "interchangeable" types Integer, String, and Buffer.
*/
if (ACPI_GET_OBJECT_TYPE(source_desc) ==
ACPI_TYPE_LOCAL_REFERENCE) {
/* Resolve a reference object first */
status =
acpi_ex_resolve_to_value(source_desc_ptr,
walk_state);
if (ACPI_FAILURE(status)) {
break;
}
}
/* For copy_object, no further validation necessary */
if (walk_state->opcode == AML_COPY_OP) {
break;
}
/* Must have a Integer, Buffer, or String */
if ((ACPI_GET_OBJECT_TYPE(source_desc) != ACPI_TYPE_INTEGER) &&
(ACPI_GET_OBJECT_TYPE(source_desc) != ACPI_TYPE_BUFFER) &&
(ACPI_GET_OBJECT_TYPE(source_desc) != ACPI_TYPE_STRING) &&
!((ACPI_GET_OBJECT_TYPE(source_desc) ==
ACPI_TYPE_LOCAL_REFERENCE)
&& (source_desc->reference.class ==
ACPI_REFCLASS_TABLE))) {
/* Conversion successful but still not a valid type */
ACPI_ERROR((AE_INFO,
"Cannot assign type %s to %s (must be type Int/Str/Buf)",
acpi_ut_get_object_type_name(source_desc),
acpi_ut_get_type_name(target_type)));
status = AE_AML_OPERAND_TYPE;
}
break;
case ACPI_TYPE_LOCAL_ALIAS:
case ACPI_TYPE_LOCAL_METHOD_ALIAS:
/*
* All aliases should have been resolved earlier, during the
* operand resolution phase.
*/
ACPI_ERROR((AE_INFO, "Store into an unresolved Alias object"));
status = AE_AML_INTERNAL;
break;
case ACPI_TYPE_PACKAGE:
default:
/*
* All other types than Alias and the various Fields come here,
* including the untyped case - ACPI_TYPE_ANY.
*/
break;
}
return_ACPI_STATUS(status);
}
/*******************************************************************************
*
* FUNCTION: acpi_ex_store_object_to_object
*
* PARAMETERS: source_desc - Object to store
* dest_desc - Object to receive a copy of the source
* new_desc - New object if dest_desc is obsoleted
* walk_state - Current walk state
*
* RETURN: Status
*
* DESCRIPTION: "Store" an object to another object. This may include
* converting the source type to the target type (implicit
* conversion), and a copy of the value of the source to
* the target.
*
* The Assignment of an object to another (not named) object
* is handled here.
* The Source passed in will replace the current value (if any)
* with the input value.
*
* When storing into an object the data is converted to the
* target object type then stored in the object. This means
* that the target object type (for an initialized target) will
* not be changed by a store operation.
*
* This module allows destination types of Number, String,
* Buffer, and Package.
*
* Assumes parameters are already validated. NOTE: source_desc
* resolution (from a reference object) must be performed by
* the caller if necessary.
*
******************************************************************************/
acpi_status
acpi_ex_store_object_to_object(union acpi_operand_object *source_desc,
union acpi_operand_object *dest_desc,
union acpi_operand_object **new_desc,
struct acpi_walk_state *walk_state)
{
union acpi_operand_object *actual_src_desc;
acpi_status status = AE_OK;
ACPI_FUNCTION_TRACE_PTR(ex_store_object_to_object, source_desc);
actual_src_desc = source_desc;
if (!dest_desc) {
/*
* There is no destination object (An uninitialized node or
* package element), so we can simply copy the source object
* creating a new destination object
*/
status =
acpi_ut_copy_iobject_to_iobject(actual_src_desc, new_desc,
walk_state);
return_ACPI_STATUS(status);
}
if (ACPI_GET_OBJECT_TYPE(source_desc) !=
ACPI_GET_OBJECT_TYPE(dest_desc)) {
/*
* The source type does not match the type of the destination.
* Perform the "implicit conversion" of the source to the current type
* of the target as per the ACPI specification.
*
* If no conversion performed, actual_src_desc = source_desc.
* Otherwise, actual_src_desc is a temporary object to hold the
* converted object.
*/
status =
acpi_ex_convert_to_target_type(ACPI_GET_OBJECT_TYPE
(dest_desc), source_desc,
&actual_src_desc,
walk_state);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
if (source_desc == actual_src_desc) {
/*
* No conversion was performed. Return the source_desc as the
* new object.
*/
*new_desc = source_desc;
return_ACPI_STATUS(AE_OK);
}
}
/*
* We now have two objects of identical types, and we can perform a
* copy of the *value* of the source object.
*/
switch (ACPI_GET_OBJECT_TYPE(dest_desc)) {
case ACPI_TYPE_INTEGER:
dest_desc->integer.value = actual_src_desc->integer.value;
/* Truncate value if we are executing from a 32-bit ACPI table */
acpi_ex_truncate_for32bit_table(dest_desc);
break;
case ACPI_TYPE_STRING:
status =
acpi_ex_store_string_to_string(actual_src_desc, dest_desc);
break;
case ACPI_TYPE_BUFFER:
status =
acpi_ex_store_buffer_to_buffer(actual_src_desc, dest_desc);
break;
case ACPI_TYPE_PACKAGE:
status =
acpi_ut_copy_iobject_to_iobject(actual_src_desc, &dest_desc,
walk_state);
break;
default:
/*
* All other types come here.
*/
ACPI_WARNING((AE_INFO, "Store into type %s not implemented",
acpi_ut_get_object_type_name(dest_desc)));
status = AE_NOT_IMPLEMENTED;
break;
}
if (actual_src_desc != source_desc) {
/* Delete the intermediate (temporary) source object */
acpi_ut_remove_reference(actual_src_desc);
}
*new_desc = dest_desc;
return_ACPI_STATUS(status);
}
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