590 lines
17 KiB
C
590 lines
17 KiB
C
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// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
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/******************************************************************************
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*
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* Module Name: exstore - AML Interpreter object store support
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*
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* Copyright (C) 2000 - 2018, Intel Corp.
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*
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*****************************************************************************/
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#include <acpi/acpi.h>
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#include "accommon.h"
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#include "acdispat.h"
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#include "acinterp.h"
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#include "amlcode.h"
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#include "acnamesp.h"
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#define _COMPONENT ACPI_EXECUTER
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ACPI_MODULE_NAME("exstore")
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/* Local prototypes */
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static acpi_status
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acpi_ex_store_object_to_index(union acpi_operand_object *val_desc,
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union acpi_operand_object *dest_desc,
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struct acpi_walk_state *walk_state);
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static acpi_status
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acpi_ex_store_direct_to_node(union acpi_operand_object *source_desc,
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struct acpi_namespace_node *node,
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struct acpi_walk_state *walk_state);
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/*******************************************************************************
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*
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* FUNCTION: acpi_ex_store
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*
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* PARAMETERS: *source_desc - Value to be stored
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* *dest_desc - Where to store it. Must be an NS node
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* or union acpi_operand_object of type
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* Reference;
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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 the value described by source_desc into the location
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* described by dest_desc. Called by various interpreter
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* functions to store the result of an operation into
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* the destination operand -- not just simply the actual "Store"
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* ASL operator.
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*
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******************************************************************************/
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acpi_status
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acpi_ex_store(union acpi_operand_object *source_desc,
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union acpi_operand_object *dest_desc,
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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 *ref_desc = dest_desc;
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ACPI_FUNCTION_TRACE_PTR(ex_store, dest_desc);
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/* Validate parameters */
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if (!source_desc || !dest_desc) {
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ACPI_ERROR((AE_INFO, "Null parameter"));
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return_ACPI_STATUS(AE_AML_NO_OPERAND);
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}
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/* dest_desc can be either a namespace node or an ACPI object */
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if (ACPI_GET_DESCRIPTOR_TYPE(dest_desc) == ACPI_DESC_TYPE_NAMED) {
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/*
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* Dest is a namespace node,
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* Storing an object into a Named node.
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*/
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status = acpi_ex_store_object_to_node(source_desc,
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(struct
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acpi_namespace_node *)
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dest_desc, walk_state,
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ACPI_IMPLICIT_CONVERSION);
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return_ACPI_STATUS(status);
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}
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/* Destination object must be a Reference or a Constant object */
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switch (dest_desc->common.type) {
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case ACPI_TYPE_LOCAL_REFERENCE:
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break;
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case ACPI_TYPE_INTEGER:
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/* Allow stores to Constants -- a Noop as per ACPI spec */
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if (dest_desc->common.flags & AOPOBJ_AML_CONSTANT) {
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return_ACPI_STATUS(AE_OK);
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}
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/*lint -fallthrough */
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default:
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/* Destination is not a Reference object */
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ACPI_ERROR((AE_INFO,
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"Target is not a Reference or Constant object - [%s] %p",
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acpi_ut_get_object_type_name(dest_desc),
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dest_desc));
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return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
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}
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/*
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* Examine the Reference class. These cases are handled:
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*
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* 1) Store to Name (Change the object associated with a name)
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* 2) Store to an indexed area of a Buffer or Package
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* 3) Store to a Method Local or Arg
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* 4) Store to the debug object
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*/
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switch (ref_desc->reference.class) {
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case ACPI_REFCLASS_REFOF:
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/* Storing an object into a Name "container" */
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status = acpi_ex_store_object_to_node(source_desc,
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ref_desc->reference.
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object, walk_state,
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ACPI_IMPLICIT_CONVERSION);
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break;
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case ACPI_REFCLASS_INDEX:
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/* Storing to an Index (pointer into a packager or buffer) */
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status =
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acpi_ex_store_object_to_index(source_desc, ref_desc,
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walk_state);
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break;
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case ACPI_REFCLASS_LOCAL:
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case ACPI_REFCLASS_ARG:
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/* Store to a method local/arg */
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status =
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acpi_ds_store_object_to_local(ref_desc->reference.class,
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ref_desc->reference.value,
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source_desc, walk_state);
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break;
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case ACPI_REFCLASS_DEBUG:
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/*
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* Storing to the Debug object causes the value stored to be
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* displayed and otherwise has no effect -- see ACPI Specification
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*/
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ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
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"**** Write to Debug Object: Object %p [%s] ****:\n\n",
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source_desc,
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acpi_ut_get_object_type_name(source_desc)));
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ACPI_DEBUG_OBJECT(source_desc, 0, 0);
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break;
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default:
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ACPI_ERROR((AE_INFO, "Unknown Reference Class 0x%2.2X",
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ref_desc->reference.class));
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ACPI_DUMP_ENTRY(ref_desc, ACPI_LV_INFO);
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status = AE_AML_INTERNAL;
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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_index
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*
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* PARAMETERS: *source_desc - Value to be stored
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* *dest_desc - Named object to receive the value
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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 the object to indexed Buffer or Package element
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*
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******************************************************************************/
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static acpi_status
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acpi_ex_store_object_to_index(union acpi_operand_object *source_desc,
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union acpi_operand_object *index_desc,
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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 *obj_desc;
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union acpi_operand_object *new_desc;
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u8 value = 0;
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u32 i;
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ACPI_FUNCTION_TRACE(ex_store_object_to_index);
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/*
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* Destination must be a reference pointer, and
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* must point to either a buffer or a package
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*/
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switch (index_desc->reference.target_type) {
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case ACPI_TYPE_PACKAGE:
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/*
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* Storing to a package element. Copy the object and replace
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* any existing object with the new object. No implicit
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* conversion is performed.
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*
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* The object at *(index_desc->Reference.Where) is the
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* element within the package that is to be modified.
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* The parent package object is at index_desc->Reference.Object
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*/
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obj_desc = *(index_desc->reference.where);
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if (source_desc->common.type == ACPI_TYPE_LOCAL_REFERENCE &&
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source_desc->reference.class == ACPI_REFCLASS_TABLE) {
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/* This is a DDBHandle, just add a reference to it */
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acpi_ut_add_reference(source_desc);
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new_desc = source_desc;
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} else {
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/* Normal object, copy it */
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status =
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acpi_ut_copy_iobject_to_iobject(source_desc,
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&new_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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}
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if (obj_desc) {
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/* Decrement reference count by the ref count of the parent package */
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for (i = 0; i < ((union acpi_operand_object *)
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index_desc->reference.object)->common.
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reference_count; i++) {
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acpi_ut_remove_reference(obj_desc);
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}
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}
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*(index_desc->reference.where) = new_desc;
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/* Increment ref count by the ref count of the parent package-1 */
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for (i = 1; i < ((union acpi_operand_object *)
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index_desc->reference.object)->common.
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reference_count; i++) {
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acpi_ut_add_reference(new_desc);
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}
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break;
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case ACPI_TYPE_BUFFER_FIELD:
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/*
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* Store into a Buffer or String (not actually a real buffer_field)
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* at a location defined by an Index.
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*
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* The first 8-bit element of the source object is written to the
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* 8-bit Buffer location defined by the Index destination object,
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* according to the ACPI 2.0 specification.
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*/
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/*
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* Make sure the target is a Buffer or String. An error should
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* not happen here, since the reference_object was constructed
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* by the INDEX_OP code.
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*/
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obj_desc = index_desc->reference.object;
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if ((obj_desc->common.type != ACPI_TYPE_BUFFER) &&
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(obj_desc->common.type != ACPI_TYPE_STRING)) {
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return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
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}
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/*
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* The assignment of the individual elements will be slightly
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* different for each source type.
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*/
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switch (source_desc->common.type) {
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case ACPI_TYPE_INTEGER:
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/* Use the least-significant byte of the integer */
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value = (u8) (source_desc->integer.value);
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break;
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case ACPI_TYPE_BUFFER:
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case ACPI_TYPE_STRING:
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/* Note: Takes advantage of common string/buffer fields */
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value = source_desc->buffer.pointer[0];
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break;
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default:
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/* All other types are invalid */
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ACPI_ERROR((AE_INFO,
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"Source must be type [Integer/Buffer/String], found [%s]",
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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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/* Store the source value into the target buffer byte */
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obj_desc->buffer.pointer[index_desc->reference.value] = value;
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break;
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default:
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ACPI_ERROR((AE_INFO,
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"Target is not of type [Package/BufferField]"));
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status = AE_AML_TARGET_TYPE;
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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_node
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*
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* PARAMETERS: source_desc - Value to be stored
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* node - Named object to receive the value
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* walk_state - Current walk state
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* implicit_conversion - Perform implicit conversion (yes/no)
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*
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* RETURN: Status
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*
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* DESCRIPTION: Store the object to the named object.
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*
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* The assignment of an object to a named object is handled here.
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* The value 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. A copy_object can change
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* the target type, however.
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*
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* The implicit_conversion flag is set to NO/FALSE only when
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* storing to an arg_x -- as per the rules of the ACPI spec.
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*
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* Assumes parameters are already validated.
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*
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******************************************************************************/
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acpi_status
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acpi_ex_store_object_to_node(union acpi_operand_object *source_desc,
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struct acpi_namespace_node *node,
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struct acpi_walk_state *walk_state,
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u8 implicit_conversion)
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{
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acpi_status status = AE_OK;
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union acpi_operand_object *target_desc;
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union acpi_operand_object *new_desc;
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acpi_object_type target_type;
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ACPI_FUNCTION_TRACE_PTR(ex_store_object_to_node, source_desc);
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/* Get current type of the node, and object attached to Node */
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target_type = acpi_ns_get_type(node);
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target_desc = acpi_ns_get_attached_object(node);
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ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Storing %p [%s] to node %p [%s]\n",
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source_desc,
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acpi_ut_get_object_type_name(source_desc), node,
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acpi_ut_get_type_name(target_type)));
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/* Only limited target types possible for everything except copy_object */
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if (walk_state->opcode != AML_COPY_OBJECT_OP) {
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/*
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* Only copy_object allows all object types to be overwritten. For
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* target_ref(s), there are restrictions on the object types that
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* are allowed.
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*
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|
|
* 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;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* 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);
|
||
|
|
}
|