// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
/******************************************************************************
*
* Module Name : exstore - AML Interpreter object store support
*
* Copyright ( C ) 2000 - 2025 , Intel Corp .
*
*****************************************************************************/
#include <acpi/acpi.h>
#include "accommon.h"
#include "acdispat.h"
#include "acinterp.h"
#include "amlcode.h"
#include "acnamesp.h"
#define _COMPONENT ACPI_EXECUTER
ACPI_MODULE_NAME("exstore" )
/* Local prototypes */
static acpi_status
acpi_ex_store_object_to_index(union acpi_operand_object *val_desc,
union acpi_operand_object *dest_desc,
struct acpi_walk_state *walk_state);
static acpi_status
acpi_ex_store_direct_to_node(union acpi_operand_object *source_desc,
struct acpi_namespace_node *node,
struct acpi_walk_state *walk_state);
/*******************************************************************************
*
* FUNCTION : acpi_ex_store
*
* PARAMETERS : * source_desc - Value to be stored
* * dest_desc - Where to store it . Must be an NS node
* or union acpi_operand_object of type
* Reference ;
* walk_state - Current walk state
*
* RETURN : Status
*
* DESCRIPTION : Store the value described by source_desc into the location
* described by dest_desc . Called by various interpreter
* functions to store the result of an operation into
* the destination operand - - not just simply the actual " Store "
* ASL operator .
*
******************************************************************************/
acpi_status
acpi_ex_store(union acpi_operand_object *source_desc,
union acpi_operand_object *dest_desc,
struct acpi_walk_state *walk_state)
{
acpi_status status = AE_OK;
union acpi_operand_object *ref_desc = dest_desc;
ACPI_FUNCTION_TRACE_PTR(ex_store, dest_desc);
/* Validate parameters */
if (!source_desc || !dest_desc) {
ACPI_ERROR((AE_INFO, "Null parameter" ));
return_ACPI_STATUS(AE_AML_NO_OPERAND);
}
/* dest_desc can be either a namespace node or an ACPI object */
if (ACPI_GET_DESCRIPTOR_TYPE(dest_desc) == ACPI_DESC_TYPE_NAMED) {
/*
* Dest is a namespace node ,
* Storing an object into a Named node .
*/
status = acpi_ex_store_object_to_node(source_desc,
(struct
acpi_namespace_node *)
dest_desc, walk_state,
ACPI_IMPLICIT_CONVERSION);
return_ACPI_STATUS(status);
}
/* Destination object must be a Reference or a Constant object */
switch (dest_desc->common.type) {
case ACPI_TYPE_LOCAL_REFERENCE:
break ;
case ACPI_TYPE_INTEGER:
/* Allow stores to Constants -- a Noop as per ACPI spec */
if (dest_desc->common.flags & AOPOBJ_AML_CONSTANT) {
return_ACPI_STATUS(AE_OK);
}
ACPI_FALLTHROUGH;
default :
/* Destination is not a Reference object */
ACPI_ERROR((AE_INFO,
"Target is not a Reference or Constant object - [%s] %p" ,
acpi_ut_get_object_type_name(dest_desc),
dest_desc));
return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
}
/*
* Examine the Reference class . These cases are handled :
*
* 1 ) Store to Name ( Change the object associated with a name )
* 2 ) Store to an indexed area of a Buffer or Package
* 3 ) Store to a Method Local or Arg
* 4 ) Store to the debug object
*/
switch (ref_desc->reference.class ) {
case ACPI_REFCLASS_REFOF:
/* Storing an object into a Name "container" */
status = acpi_ex_store_object_to_node(source_desc,
ref_desc->reference.
object, walk_state,
ACPI_IMPLICIT_CONVERSION);
break ;
case ACPI_REFCLASS_INDEX:
/* Storing to an Index (pointer into a packager or buffer) */
status =
acpi_ex_store_object_to_index(source_desc, ref_desc,
walk_state);
break ;
case ACPI_REFCLASS_LOCAL:
case ACPI_REFCLASS_ARG:
/* Store to a method local/arg */
status =
acpi_ds_store_object_to_local(ref_desc->reference.class ,
ref_desc->reference.value,
source_desc, walk_state);
break ;
case ACPI_REFCLASS_DEBUG:
/*
* Storing to the Debug object causes the value stored to be
* displayed and otherwise has no effect - - see ACPI Specification
*/
ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
"**** Write to Debug Object: Object %p [%s] ****:\n\n" ,
source_desc,
acpi_ut_get_object_type_name(source_desc)));
ACPI_DEBUG_OBJECT(source_desc, 0 , 0 );
break ;
default :
ACPI_ERROR((AE_INFO, "Unknown Reference Class 0x%2.2X" ,
ref_desc->reference.class ));
ACPI_DUMP_ENTRY(ref_desc, ACPI_LV_INFO);
status = AE_AML_INTERNAL;
break ;
}
return_ACPI_STATUS(status);
}
/*******************************************************************************
*
* FUNCTION : acpi_ex_store_object_to_index
*
* PARAMETERS : * source_desc - Value to be stored
* * dest_desc - Named object to receive the value
* walk_state - Current walk state
*
* RETURN : Status
*
* DESCRIPTION : Store the object to indexed Buffer or Package element
*
******************************************************************************/
static acpi_status
acpi_ex_store_object_to_index(union acpi_operand_object *source_desc,
union acpi_operand_object *index_desc,
struct acpi_walk_state *walk_state)
{
acpi_status status = AE_OK;
union acpi_operand_object *obj_desc;
union acpi_operand_object *new_desc;
u8 value = 0 ;
u32 i;
ACPI_FUNCTION_TRACE(ex_store_object_to_index);
/*
* Destination must be a reference pointer , and
* must point to either a buffer or a package
*/
switch (index_desc->reference.target_type) {
case ACPI_TYPE_PACKAGE:
/*
* Storing to a package element . Copy the object and replace
* any existing object with the new object . No implicit
* conversion is performed .
*
* The object at * ( index_desc - > Reference . Where ) is the
* element within the package that is to be modified .
* The parent package object is at index_desc - > Reference . Object
*/
obj_desc = *(index_desc->reference.where);
if (source_desc->common.type == ACPI_TYPE_LOCAL_REFERENCE &&
source_desc->reference.class == ACPI_REFCLASS_TABLE) {
/* This is a DDBHandle, just add a reference to it */
acpi_ut_add_reference(source_desc);
new_desc = source_desc;
} else {
/* Normal object, copy it */
status =
acpi_ut_copy_iobject_to_iobject(source_desc,
&new_desc,
walk_state);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
}
if (obj_desc) {
/* Decrement reference count by the ref count of the parent package */
for (i = 0 ; i < ((union acpi_operand_object *)
index_desc->reference.object)->common.
reference_count; i++) {
acpi_ut_remove_reference(obj_desc);
}
}
*(index_desc->reference.where) = new_desc;
/* Increment ref count by the ref count of the parent package-1 */
for (i = 1 ; i < ((union acpi_operand_object *)
index_desc->reference.object)->common.
reference_count; i++) {
acpi_ut_add_reference(new_desc);
}
break ;
case ACPI_TYPE_BUFFER_FIELD:
/*
* Store into a Buffer or String ( not actually a real buffer_field )
* at a location defined by an Index .
*
* The first 8 - bit element of the source object is written to the
* 8 - bit Buffer location defined by the Index destination object ,
* according to the ACPI 2 . 0 specification .
*/
/*
* Make sure the target is a Buffer or String . An error should
* not happen here , since the reference_object was constructed
* by the INDEX_OP code .
*/
obj_desc = index_desc->reference.object;
if ((obj_desc->common.type != ACPI_TYPE_BUFFER) &&
(obj_desc->common.type != ACPI_TYPE_STRING)) {
return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
}
/*
* The assignment of the individual elements will be slightly
* different for each source type .
*/
switch (source_desc->common.type) {
case ACPI_TYPE_INTEGER:
/* Use the least-significant byte of the integer */
value = (u8) (source_desc->integer.value);
break ;
case ACPI_TYPE_BUFFER:
case ACPI_TYPE_STRING:
/* Note: Takes advantage of common string/buffer fields */
value = source_desc->buffer.pointer[0 ];
break ;
default :
/* All other types are invalid */
ACPI_ERROR((AE_INFO,
"Source must be type [Integer/Buffer/String], found [%s]" ,
acpi_ut_get_object_type_name(source_desc)));
return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
}
/* Store the source value into the target buffer byte */
obj_desc->buffer.pointer[index_desc->reference.value] = value;
break ;
default :
ACPI_ERROR((AE_INFO,
"Target is not of type [Package/BufferField]" ));
status = AE_AML_TARGET_TYPE;
break ;
}
return_ACPI_STATUS(status);
}
/*******************************************************************************
*
* FUNCTION : acpi_ex_store_object_to_node
*
* PARAMETERS : source_desc - Value to be stored
* node - Named object to receive the value
* walk_state - Current walk state
* implicit_conversion - Perform implicit conversion ( yes / no )
*
* RETURN : Status
*
* DESCRIPTION : Store the object to the named object .
*
* The assignment of an object to a named object is handled here .
* The value 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 . A copy_object can change
* the target type , however .
*
* The implicit_conversion flag is set to NO / FALSE only when
* storing to an arg_x - - as per the rules of the ACPI spec .
*
* Assumes parameters are already validated .
*
******************************************************************************/
acpi_status
acpi_ex_store_object_to_node(union acpi_operand_object *source_desc,
struct acpi_namespace_node *node,
struct acpi_walk_state *walk_state,
u8 implicit_conversion)
{
acpi_status status = AE_OK;
union acpi_operand_object *target_desc;
union acpi_operand_object *new_desc;
acpi_object_type target_type;
ACPI_FUNCTION_TRACE_PTR(ex_store_object_to_node, source_desc);
/* Get current type of the node, and object attached to Node */
target_type = acpi_ns_get_type(node);
target_desc = acpi_ns_get_attached_object(node);
ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Storing %p [%s] to node %p [%s]\n" ,
source_desc,
acpi_ut_get_object_type_name(source_desc), node,
acpi_ut_get_type_name(target_type)));
/* Only limited target types possible for everything except copy_object */
if (walk_state->opcode != AML_COPY_OBJECT_OP) {
/*
* Only copy_object allows all object types to be overwritten . For
* target_ref ( s ) , there are restrictions on the object types that
* are allowed .
*
* Allowable operations / typing for Store :
*
* 1 ) Simple Store
* Integer - - > Integer ( Named / Local / Arg )
* String - - > String ( Named / Local / Arg )
* Buffer - - > Buffer ( Named / Local / Arg )
* Package - - > Package ( Named / Local / Arg )
*
* 2 ) Store with implicit conversion
* Integer - - > String or Buffer ( Named )
* String - - > Integer or Buffer ( Named )
* Buffer - - > Integer or String ( Named )
*/
switch (target_type) {
case ACPI_TYPE_PACKAGE:
/*
* Here , can only store a package to an existing package .
* Storing a package to a Local / Arg is OK , and handled
* elsewhere .
*/
if (walk_state->opcode == AML_STORE_OP) {
if (source_desc->common.type !=
ACPI_TYPE_PACKAGE) {
ACPI_ERROR((AE_INFO,
"Cannot assign type [%s] to [Package] "
"(source must be type Pkg)" ,
acpi_ut_get_object_type_name
(source_desc)));
return_ACPI_STATUS(AE_AML_TARGET_TYPE);
}
break ;
}
ACPI_FALLTHROUGH;
case ACPI_TYPE_DEVICE:
case ACPI_TYPE_EVENT:
case ACPI_TYPE_MUTEX:
case ACPI_TYPE_REGION:
case ACPI_TYPE_POWER:
case ACPI_TYPE_PROCESSOR:
case ACPI_TYPE_THERMAL:
ACPI_ERROR((AE_INFO,
"Target must be [Buffer/Integer/String/Reference]"
", found [%s] (%4.4s)" ,
acpi_ut_get_type_name(node->type),
node->name.ascii));
return_ACPI_STATUS(AE_AML_TARGET_TYPE);
default :
break ;
}
}
/*
* Resolve the source object to an actual value
* ( If it is a reference object )
*/
status = acpi_ex_resolve_object(&source_desc, target_type, walk_state);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
/* Do the actual store operation */
switch (target_type) {
/*
* The simple data types all support implicit source operand
* conversion before the store .
*/
case ACPI_TYPE_INTEGER:
case ACPI_TYPE_STRING:
case ACPI_TYPE_BUFFER:
if ((walk_state->opcode == AML_COPY_OBJECT_OP) ||
!implicit_conversion) {
/*
* However , copy_object and Stores to arg_x do not perform
* an implicit conversion , as per the ACPI specification .
* A direct store is performed instead .
*/
status =
acpi_ex_store_direct_to_node(source_desc, node,
walk_state);
break ;
}
/* Store with implicit source operand conversion support */
status =
acpi_ex_store_object_to_object(source_desc, target_desc,
&new_desc, walk_state);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
if (new_desc != target_desc) {
/*
* Store the new new_desc as the new value of the Name , and set
* the Name ' s type to that of the value being stored in it .
* source_desc reference count is incremented by attach_object .
*
* Note : This may change the type of the node if an explicit
* store has been performed such that the node / object type
* has been changed .
*/
status =
acpi_ns_attach_object(node, new_desc,
new_desc->common.type);
ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
"Store type [%s] into [%s] via Convert/Attach\n" ,
acpi_ut_get_object_type_name
(source_desc),
acpi_ut_get_object_type_name
(new_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:
/*
* For all fields , always write the source data to the target
* field . Any required implicit source operand conversion is
* performed in the function below as necessary . Note , field
* objects must retain their original type permanently .
*/
status = acpi_ex_write_data_to_field(source_desc, target_desc,
&walk_state->result_obj);
break ;
default :
/*
* copy_object operator : No conversions for all other types .
* Instead , directly store a copy of the source object .
*
* This is the ACPI spec - defined behavior for the copy_object
* operator . ( Note , for this default case , all normal
* Store / Target operations exited above with an error ) .
*/
status =
acpi_ex_store_direct_to_node(source_desc, node, walk_state);
break ;
}
return_ACPI_STATUS(status);
}
/*******************************************************************************
*
* FUNCTION : acpi_ex_store_direct_to_node
*
* PARAMETERS : source_desc - Value to be stored
* node - Named object to receive the value
* walk_state - Current walk state
*
* RETURN : Status
*
* DESCRIPTION : " Store " an object directly to a node . This involves a copy
* and an attach .
*
******************************************************************************/
static acpi_status
acpi_ex_store_direct_to_node(union acpi_operand_object *source_desc,
struct acpi_namespace_node *node,
struct acpi_walk_state *walk_state)
{
acpi_status status;
union acpi_operand_object *new_desc;
ACPI_FUNCTION_TRACE(ex_store_direct_to_node);
ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
"Storing [%s] (%p) directly into node [%s] (%p)"
" with no implicit conversion\n" ,
acpi_ut_get_object_type_name(source_desc),
source_desc, acpi_ut_get_type_name(node->type),
node));
/* Copy the source object to a new object */
status =
acpi_ut_copy_iobject_to_iobject(source_desc, &new_desc, walk_state);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
/* Attach the new object to the node */
status = acpi_ns_attach_object(node, new_desc, new_desc->common.type);
acpi_ut_remove_reference(new_desc);
return_ACPI_STATUS(status);
}
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