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// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
/******************************************************************************
*
* Module Name: exstoren - AML Interpreter object store support,
* Store to Node (namespace object)
*
* Copyright (C) 2000 - 2020, Intel Corp.
*
*****************************************************************************/
#include <acpi/acpi.h>
#include "accommon.h"
#include "acinterp.h"
#include "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 (source_desc->common.type == 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_OBJECT_OP) {
break;
}
/* Must have a Integer, Buffer, or String */
if ((source_desc->common.type != ACPI_TYPE_INTEGER) &&
(source_desc->common.type != ACPI_TYPE_BUFFER) &&
(source_desc->common.type != ACPI_TYPE_STRING) &&
!((source_desc->common.type == 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 (source_desc->common.type != dest_desc->common.type) {
/*
* 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(dest_desc->common.type,
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 (dest_desc->common.type) {
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 */
(void)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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