acpica/executer/exresolv.c

db2bae30SDana Myers/******************************************************************************
db2bae30SDana Myers *
db2bae30SDana Myers * Module Name: exresolv - AML Interpreter object resolution
db2bae30SDana Myers *
db2bae30SDana Myers *****************************************************************************/
db2bae30SDana Myers
26f3cdf0SGordon Ross/*
*385cc6b4SJerry Jelinek * Copyright (C) 2000 - 2016, Intel Corp.
db2bae30SDana Myers * All rights reserved.
db2bae30SDana Myers *
26f3cdf0SGordon Ross * Redistribution and use in source and binary forms, with or without
26f3cdf0SGordon Ross * modification, are permitted provided that the following conditions
26f3cdf0SGordon Ross * are met:
26f3cdf0SGordon Ross * 1. Redistributions of source code must retain the above copyright
26f3cdf0SGordon Ross *    notice, this list of conditions, and the following disclaimer,
26f3cdf0SGordon Ross *    without modification.
26f3cdf0SGordon Ross * 2. Redistributions in binary form must reproduce at minimum a disclaimer
26f3cdf0SGordon Ross *    substantially similar to the "NO WARRANTY" disclaimer below
26f3cdf0SGordon Ross *    ("Disclaimer") and any redistribution must be conditioned upon
26f3cdf0SGordon Ross *    including a substantially similar Disclaimer requirement for further
26f3cdf0SGordon Ross *    binary redistribution.
26f3cdf0SGordon Ross * 3. Neither the names of the above-listed copyright holders nor the names
26f3cdf0SGordon Ross *    of any contributors may be used to endorse or promote products derived
26f3cdf0SGordon Ross *    from this software without specific prior written permission.
db2bae30SDana Myers *
26f3cdf0SGordon Ross * Alternatively, this software may be distributed under the terms of the
26f3cdf0SGordon Ross * GNU General Public License ("GPL") version 2 as published by the Free
26f3cdf0SGordon Ross * Software Foundation.
db2bae30SDana Myers *
26f3cdf0SGordon Ross * NO WARRANTY
26f3cdf0SGordon Ross * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
26f3cdf0SGordon Ross * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
26f3cdf0SGordon Ross * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
26f3cdf0SGordon Ross * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
26f3cdf0SGordon Ross * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26f3cdf0SGordon Ross * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26f3cdf0SGordon Ross * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26f3cdf0SGordon Ross * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
26f3cdf0SGordon Ross * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
26f3cdf0SGordon Ross * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26f3cdf0SGordon Ross * POSSIBILITY OF SUCH DAMAGES.
26f3cdf0SGordon Ross */
db2bae30SDana Myers
db2bae30SDana Myers#include "acpi.h"
aa2aa9a6SDana Myers#include "accommon.h"
db2bae30SDana Myers#include "amlcode.h"
db2bae30SDana Myers#include "acdispat.h"
db2bae30SDana Myers#include "acinterp.h"
db2bae30SDana Myers#include "acnamesp.h"
db2bae30SDana Myers
db2bae30SDana Myers
db2bae30SDana Myers#define _COMPONENT          ACPI_EXECUTER
db2bae30SDana Myers        ACPI_MODULE_NAME    ("exresolv")
db2bae30SDana Myers
db2bae30SDana Myers/* Local prototypes */
db2bae30SDana Myers
db2bae30SDana Myersstatic ACPI_STATUS
db2bae30SDana MyersAcpiExResolveObjectToValue (
db2bae30SDana Myers    ACPI_OPERAND_OBJECT     **StackPtr,
db2bae30SDana Myers    ACPI_WALK_STATE         *WalkState);
db2bae30SDana Myers
db2bae30SDana Myers
db2bae30SDana Myers/*******************************************************************************
db2bae30SDana Myers *
db2bae30SDana Myers * FUNCTION:    AcpiExResolveToValue
db2bae30SDana Myers *
db2bae30SDana Myers * PARAMETERS:  **StackPtr          - Points to entry on ObjStack, which can
db2bae30SDana Myers *                                    be either an (ACPI_OPERAND_OBJECT *)
db2bae30SDana Myers *                                    or an ACPI_HANDLE.
db2bae30SDana Myers *              WalkState           - Current method state
db2bae30SDana Myers *
db2bae30SDana Myers * RETURN:      Status
db2bae30SDana Myers *
db2bae30SDana Myers * DESCRIPTION: Convert Reference objects to values
db2bae30SDana Myers *
db2bae30SDana Myers ******************************************************************************/
db2bae30SDana Myers
db2bae30SDana MyersACPI_STATUS
db2bae30SDana MyersAcpiExResolveToValue (
db2bae30SDana Myers    ACPI_OPERAND_OBJECT     **StackPtr,
db2bae30SDana Myers    ACPI_WALK_STATE         *WalkState)
db2bae30SDana Myers{
db2bae30SDana Myers    ACPI_STATUS             Status;
db2bae30SDana Myers
db2bae30SDana Myers
db2bae30SDana Myers    ACPI_FUNCTION_TRACE_PTR (ExResolveToValue, StackPtr);
db2bae30SDana Myers
db2bae30SDana Myers
db2bae30SDana Myers    if (!StackPtr || !*StackPtr)
db2bae30SDana Myers    {
db2bae30SDana Myers        ACPI_ERROR ((AE_INFO, "Internal - null pointer"));
db2bae30SDana Myers        return_ACPI_STATUS (AE_AML_NO_OPERAND);
db2bae30SDana Myers    }
db2bae30SDana Myers
db2bae30SDana Myers    /*
db2bae30SDana Myers     * The entity pointed to by the StackPtr can be either
db2bae30SDana Myers     * 1) A valid ACPI_OPERAND_OBJECT, or
db2bae30SDana Myers     * 2) A ACPI_NAMESPACE_NODE (NamedObj)
db2bae30SDana Myers     */
db2bae30SDana Myers    if (ACPI_GET_DESCRIPTOR_TYPE (*StackPtr) == ACPI_DESC_TYPE_OPERAND)
db2bae30SDana Myers    {
db2bae30SDana Myers        Status = AcpiExResolveObjectToValue (StackPtr, WalkState);
db2bae30SDana Myers        if (ACPI_FAILURE (Status))
db2bae30SDana Myers        {
db2bae30SDana Myers            return_ACPI_STATUS (Status);
db2bae30SDana Myers        }
db2bae30SDana Myers
db2bae30SDana Myers        if (!*StackPtr)
db2bae30SDana Myers        {
db2bae30SDana Myers            ACPI_ERROR ((AE_INFO, "Internal - null pointer"));
db2bae30SDana Myers            return_ACPI_STATUS (AE_AML_NO_OPERAND);
db2bae30SDana Myers        }
db2bae30SDana Myers    }
db2bae30SDana Myers
db2bae30SDana Myers    /*
db2bae30SDana Myers     * Object on the stack may have changed if AcpiExResolveObjectToValue()
db2bae30SDana Myers     * was called (i.e., we can't use an _else_ here.)
db2bae30SDana Myers     */
db2bae30SDana Myers    if (ACPI_GET_DESCRIPTOR_TYPE (*StackPtr) == ACPI_DESC_TYPE_NAMED)
db2bae30SDana Myers    {
db2bae30SDana Myers        Status = AcpiExResolveNodeToValue (
db2bae30SDana Myers            ACPI_CAST_INDIRECT_PTR (ACPI_NAMESPACE_NODE, StackPtr),
db2bae30SDana Myers            WalkState);
db2bae30SDana Myers        if (ACPI_FAILURE (Status))
db2bae30SDana Myers        {
db2bae30SDana Myers            return_ACPI_STATUS (Status);
db2bae30SDana Myers        }
db2bae30SDana Myers    }
db2bae30SDana Myers
db2bae30SDana Myers    ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Resolved object %p\n", *StackPtr));
db2bae30SDana Myers    return_ACPI_STATUS (AE_OK);
db2bae30SDana Myers}
db2bae30SDana Myers
db2bae30SDana Myers
db2bae30SDana Myers/*******************************************************************************
db2bae30SDana Myers *
db2bae30SDana Myers * FUNCTION:    AcpiExResolveObjectToValue
db2bae30SDana Myers *
db2bae30SDana Myers * PARAMETERS:  StackPtr        - Pointer to an internal object
db2bae30SDana Myers *              WalkState       - Current method state
db2bae30SDana Myers *
db2bae30SDana Myers * RETURN:      Status
db2bae30SDana Myers *
db2bae30SDana Myers * DESCRIPTION: Retrieve the value from an internal object. The Reference type
db2bae30SDana Myers *              uses the associated AML opcode to determine the value.
db2bae30SDana Myers *
db2bae30SDana Myers ******************************************************************************/
db2bae30SDana Myers
db2bae30SDana Myersstatic ACPI_STATUS
db2bae30SDana MyersAcpiExResolveObjectToValue (
db2bae30SDana Myers    ACPI_OPERAND_OBJECT     **StackPtr,
db2bae30SDana Myers    ACPI_WALK_STATE         *WalkState)
db2bae30SDana Myers{
db2bae30SDana Myers    ACPI_STATUS             Status = AE_OK;
db2bae30SDana Myers    ACPI_OPERAND_OBJECT     *StackDesc;
db2bae30SDana Myers    ACPI_OPERAND_OBJECT     *ObjDesc = NULL;
db2bae30SDana Myers    UINT8                   RefType;
db2bae30SDana Myers
db2bae30SDana Myers
db2bae30SDana Myers    ACPI_FUNCTION_TRACE (ExResolveObjectToValue);
db2bae30SDana Myers
db2bae30SDana Myers
db2bae30SDana Myers    StackDesc = *StackPtr;
db2bae30SDana Myers
*385cc6b4SJerry Jelinek    /* This is an object of type ACPI_OPERAND_OBJECT */
db2bae30SDana Myers
aa2aa9a6SDana Myers    switch (StackDesc->Common.Type)
db2bae30SDana Myers    {
db2bae30SDana Myers    case ACPI_TYPE_LOCAL_REFERENCE:
db2bae30SDana Myers
db2bae30SDana Myers        RefType = StackDesc->Reference.Class;
db2bae30SDana Myers
db2bae30SDana Myers        switch (RefType)
db2bae30SDana Myers        {
db2bae30SDana Myers        case ACPI_REFCLASS_LOCAL:
db2bae30SDana Myers        case ACPI_REFCLASS_ARG:
db2bae30SDana Myers            /*
db2bae30SDana Myers             * Get the local from the method's state info
db2bae30SDana Myers             * Note: this increments the local's object reference count
db2bae30SDana Myers             */
db2bae30SDana Myers            Status = AcpiDsMethodDataGetValue (RefType,
db2bae30SDana Myers                StackDesc->Reference.Value, WalkState, &ObjDesc);
db2bae30SDana Myers            if (ACPI_FAILURE (Status))
db2bae30SDana Myers            {
db2bae30SDana Myers                return_ACPI_STATUS (Status);
db2bae30SDana Myers            }
db2bae30SDana Myers
db2bae30SDana Myers            ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "[Arg/Local %X] ValueObj is %p\n",
db2bae30SDana Myers                StackDesc->Reference.Value, ObjDesc));
db2bae30SDana Myers
db2bae30SDana Myers            /*
db2bae30SDana Myers             * Now we can delete the original Reference Object and
db2bae30SDana Myers             * replace it with the resolved value
db2bae30SDana Myers             */
db2bae30SDana Myers            AcpiUtRemoveReference (StackDesc);
db2bae30SDana Myers            *StackPtr = ObjDesc;
db2bae30SDana Myers            break;
db2bae30SDana Myers
db2bae30SDana Myers        case ACPI_REFCLASS_INDEX:
db2bae30SDana Myers
db2bae30SDana Myers            switch (StackDesc->Reference.TargetType)
db2bae30SDana Myers            {
db2bae30SDana Myers            case ACPI_TYPE_BUFFER_FIELD:
db2bae30SDana Myers
db2bae30SDana Myers                /* Just return - do not dereference */
db2bae30SDana Myers                break;
db2bae30SDana Myers
db2bae30SDana Myers            case ACPI_TYPE_PACKAGE:
db2bae30SDana Myers
db2bae30SDana Myers                /* If method call or CopyObject - do not dereference */
db2bae30SDana Myers
db2bae30SDana Myers                if ((WalkState->Opcode == AML_INT_METHODCALL_OP) ||
db2bae30SDana Myers                    (WalkState->Opcode == AML_COPY_OP))
db2bae30SDana Myers                {
db2bae30SDana Myers                    break;
db2bae30SDana Myers                }
db2bae30SDana Myers
db2bae30SDana Myers                /* Otherwise, dereference the PackageIndex to a package element */
db2bae30SDana Myers
db2bae30SDana Myers                ObjDesc = *StackDesc->Reference.Where;
db2bae30SDana Myers                if (ObjDesc)
db2bae30SDana Myers                {
db2bae30SDana Myers                    /*
db2bae30SDana Myers                     * Valid object descriptor, copy pointer to return value
db2bae30SDana Myers                     * (i.e., dereference the package index)
db2bae30SDana Myers                     * Delete the ref object, increment the returned object
db2bae30SDana Myers                     */
db2bae30SDana Myers                    AcpiUtAddReference (ObjDesc);
db2bae30SDana Myers                    *StackPtr = ObjDesc;
db2bae30SDana Myers                }
db2bae30SDana Myers                else
db2bae30SDana Myers                {
db2bae30SDana Myers                    /*
db2bae30SDana Myers                     * A NULL object descriptor means an uninitialized element of
db2bae30SDana Myers                     * the package, can't dereference it
db2bae30SDana Myers                     */
db2bae30SDana Myers                    ACPI_ERROR ((AE_INFO,
*385cc6b4SJerry Jelinek                        "Attempt to dereference an Index to "
*385cc6b4SJerry Jelinek                        "NULL package element Idx=%p",
db2bae30SDana Myers                        StackDesc));
db2bae30SDana Myers                    Status = AE_AML_UNINITIALIZED_ELEMENT;
db2bae30SDana Myers                }
db2bae30SDana Myers                break;
db2bae30SDana Myers
db2bae30SDana Myers            default:
db2bae30SDana Myers
db2bae30SDana Myers                /* Invalid reference object */
db2bae30SDana Myers
db2bae30SDana Myers                ACPI_ERROR ((AE_INFO,
26f3cdf0SGordon Ross                    "Unknown TargetType 0x%X in Index/Reference object %p",
db2bae30SDana Myers                    StackDesc->Reference.TargetType, StackDesc));
db2bae30SDana Myers                Status = AE_AML_INTERNAL;
db2bae30SDana Myers                break;
db2bae30SDana Myers            }
db2bae30SDana Myers            break;
db2bae30SDana Myers
db2bae30SDana Myers        case ACPI_REFCLASS_REFOF:
db2bae30SDana Myers        case ACPI_REFCLASS_DEBUG:
db2bae30SDana Myers        case ACPI_REFCLASS_TABLE:
db2bae30SDana Myers
db2bae30SDana Myers            /* Just leave the object as-is, do not dereference */
db2bae30SDana Myers
db2bae30SDana Myers            break;
db2bae30SDana Myers
db2bae30SDana Myers        case ACPI_REFCLASS_NAME:   /* Reference to a named object */
db2bae30SDana Myers
db2bae30SDana Myers            /* Dereference the name */
db2bae30SDana Myers
db2bae30SDana Myers            if ((StackDesc->Reference.Node->Type == ACPI_TYPE_DEVICE) ||
db2bae30SDana Myers                (StackDesc->Reference.Node->Type == ACPI_TYPE_THERMAL))
db2bae30SDana Myers            {
db2bae30SDana Myers                /* These node types do not have 'real' subobjects */
db2bae30SDana Myers
db2bae30SDana Myers                *StackPtr = (void *) StackDesc->Reference.Node;
db2bae30SDana Myers            }
db2bae30SDana Myers            else
db2bae30SDana Myers            {
db2bae30SDana Myers                /* Get the object pointed to by the namespace node */
db2bae30SDana Myers
db2bae30SDana Myers                *StackPtr = (StackDesc->Reference.Node)->Object;
db2bae30SDana Myers                AcpiUtAddReference (*StackPtr);
db2bae30SDana Myers            }
db2bae30SDana Myers
db2bae30SDana Myers            AcpiUtRemoveReference (StackDesc);
db2bae30SDana Myers            break;
db2bae30SDana Myers
db2bae30SDana Myers        default:
db2bae30SDana Myers
db2bae30SDana Myers            ACPI_ERROR ((AE_INFO,
*385cc6b4SJerry Jelinek                "Unknown Reference type 0x%X in %p",
*385cc6b4SJerry Jelinek                RefType, StackDesc));
db2bae30SDana Myers            Status = AE_AML_INTERNAL;
db2bae30SDana Myers            break;
db2bae30SDana Myers        }
db2bae30SDana Myers        break;
db2bae30SDana Myers
db2bae30SDana Myers    case ACPI_TYPE_BUFFER:
db2bae30SDana Myers
db2bae30SDana Myers        Status = AcpiDsGetBufferArguments (StackDesc);
db2bae30SDana Myers        break;
db2bae30SDana Myers
db2bae30SDana Myers    case ACPI_TYPE_PACKAGE:
db2bae30SDana Myers
db2bae30SDana Myers        Status = AcpiDsGetPackageArguments (StackDesc);
db2bae30SDana Myers        break;
db2bae30SDana Myers
db2bae30SDana Myers    case ACPI_TYPE_BUFFER_FIELD:
db2bae30SDana Myers    case ACPI_TYPE_LOCAL_REGION_FIELD:
db2bae30SDana Myers    case ACPI_TYPE_LOCAL_BANK_FIELD:
db2bae30SDana Myers    case ACPI_TYPE_LOCAL_INDEX_FIELD:
db2bae30SDana Myers
*385cc6b4SJerry Jelinek        ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
*385cc6b4SJerry Jelinek            "FieldRead SourceDesc=%p Type=%X\n",
aa2aa9a6SDana Myers            StackDesc, StackDesc->Common.Type));
db2bae30SDana Myers
db2bae30SDana Myers        Status = AcpiExReadDataFromField (WalkState, StackDesc, &ObjDesc);
db2bae30SDana Myers
db2bae30SDana Myers        /* Remove a reference to the original operand, then override */
db2bae30SDana Myers
db2bae30SDana Myers        AcpiUtRemoveReference (*StackPtr);
db2bae30SDana Myers        *StackPtr = (void *) ObjDesc;
db2bae30SDana Myers        break;
db2bae30SDana Myers
db2bae30SDana Myers    default:
*385cc6b4SJerry Jelinek
db2bae30SDana Myers        break;
db2bae30SDana Myers    }
db2bae30SDana Myers
db2bae30SDana Myers    return_ACPI_STATUS (Status);
db2bae30SDana Myers}
db2bae30SDana Myers
db2bae30SDana Myers
db2bae30SDana Myers/*******************************************************************************
db2bae30SDana Myers *
db2bae30SDana Myers * FUNCTION:    AcpiExResolveMultiple
db2bae30SDana Myers *
db2bae30SDana Myers * PARAMETERS:  WalkState           - Current state (contains AML opcode)
db2bae30SDana Myers *              Operand             - Starting point for resolution
db2bae30SDana Myers *              ReturnType          - Where the object type is returned
db2bae30SDana Myers *              ReturnDesc          - Where the resolved object is returned
db2bae30SDana Myers *
db2bae30SDana Myers * RETURN:      Status
db2bae30SDana Myers *
db2bae30SDana Myers * DESCRIPTION: Return the base object and type. Traverse a reference list if
db2bae30SDana Myers *              necessary to get to the base object.
db2bae30SDana Myers *
db2bae30SDana Myers ******************************************************************************/
db2bae30SDana Myers
db2bae30SDana MyersACPI_STATUS
db2bae30SDana MyersAcpiExResolveMultiple (
db2bae30SDana Myers    ACPI_WALK_STATE         *WalkState,
db2bae30SDana Myers    ACPI_OPERAND_OBJECT     *Operand,
db2bae30SDana Myers    ACPI_OBJECT_TYPE        *ReturnType,
db2bae30SDana Myers    ACPI_OPERAND_OBJECT     **ReturnDesc)
db2bae30SDana Myers{
*385cc6b4SJerry Jelinek    ACPI_OPERAND_OBJECT     *ObjDesc = ACPI_CAST_PTR (void, Operand);
*385cc6b4SJerry Jelinek    ACPI_NAMESPACE_NODE     *Node = ACPI_CAST_PTR (ACPI_NAMESPACE_NODE, Operand);
db2bae30SDana Myers    ACPI_OBJECT_TYPE        Type;
db2bae30SDana Myers    ACPI_STATUS             Status;
db2bae30SDana Myers
db2bae30SDana Myers
db2bae30SDana Myers    ACPI_FUNCTION_TRACE (AcpiExResolveMultiple);
db2bae30SDana Myers
db2bae30SDana Myers
db2bae30SDana Myers    /* Operand can be either a namespace node or an operand descriptor */
db2bae30SDana Myers
db2bae30SDana Myers    switch (ACPI_GET_DESCRIPTOR_TYPE (ObjDesc))
db2bae30SDana Myers    {
db2bae30SDana Myers    case ACPI_DESC_TYPE_OPERAND:
*385cc6b4SJerry Jelinek
db2bae30SDana Myers        Type = ObjDesc->Common.Type;
db2bae30SDana Myers        break;
db2bae30SDana Myers
db2bae30SDana Myers    case ACPI_DESC_TYPE_NAMED:
*385cc6b4SJerry Jelinek
db2bae30SDana Myers        Type = ((ACPI_NAMESPACE_NODE *) ObjDesc)->Type;
*385cc6b4SJerry Jelinek        ObjDesc = AcpiNsGetAttachedObject (Node);
db2bae30SDana Myers
db2bae30SDana Myers        /* If we had an Alias node, use the attached object for type info */
db2bae30SDana Myers
db2bae30SDana Myers        if (Type == ACPI_TYPE_LOCAL_ALIAS)
db2bae30SDana Myers        {
db2bae30SDana Myers            Type = ((ACPI_NAMESPACE_NODE *) ObjDesc)->Type;
*385cc6b4SJerry Jelinek            ObjDesc = AcpiNsGetAttachedObject (
*385cc6b4SJerry Jelinek                (ACPI_NAMESPACE_NODE *) ObjDesc);
*385cc6b4SJerry Jelinek        }
*385cc6b4SJerry Jelinek
*385cc6b4SJerry Jelinek        if (!ObjDesc)
*385cc6b4SJerry Jelinek        {
*385cc6b4SJerry Jelinek            ACPI_ERROR ((AE_INFO,
*385cc6b4SJerry Jelinek                "[%4.4s] Node is unresolved or uninitialized",
*385cc6b4SJerry Jelinek                AcpiUtGetNodeName (Node)));
*385cc6b4SJerry Jelinek            return_ACPI_STATUS (AE_AML_UNINITIALIZED_NODE);
db2bae30SDana Myers        }
db2bae30SDana Myers        break;
db2bae30SDana Myers
db2bae30SDana Myers    default:
db2bae30SDana Myers        return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
db2bae30SDana Myers    }
db2bae30SDana Myers
db2bae30SDana Myers    /* If type is anything other than a reference, we are done */
db2bae30SDana Myers
db2bae30SDana Myers    if (Type != ACPI_TYPE_LOCAL_REFERENCE)
db2bae30SDana Myers    {
db2bae30SDana Myers        goto Exit;
db2bae30SDana Myers    }
db2bae30SDana Myers
db2bae30SDana Myers    /*
db2bae30SDana Myers     * For reference objects created via the RefOf, Index, or Load/LoadTable
db2bae30SDana Myers     * operators, we need to get to the base object (as per the ACPI
db2bae30SDana Myers     * specification of the ObjectType and SizeOf operators). This means
db2bae30SDana Myers     * traversing the list of possibly many nested references.
db2bae30SDana Myers     */
aa2aa9a6SDana Myers    while (ObjDesc->Common.Type == ACPI_TYPE_LOCAL_REFERENCE)
db2bae30SDana Myers    {
db2bae30SDana Myers        switch (ObjDesc->Reference.Class)
db2bae30SDana Myers        {
db2bae30SDana Myers        case ACPI_REFCLASS_REFOF:
db2bae30SDana Myers        case ACPI_REFCLASS_NAME:
db2bae30SDana Myers
db2bae30SDana Myers            /* Dereference the reference pointer */
db2bae30SDana Myers
db2bae30SDana Myers            if (ObjDesc->Reference.Class == ACPI_REFCLASS_REFOF)
db2bae30SDana Myers            {
db2bae30SDana Myers                Node = ObjDesc->Reference.Object;
db2bae30SDana Myers            }
db2bae30SDana Myers            else /* AML_INT_NAMEPATH_OP */
db2bae30SDana Myers            {
db2bae30SDana Myers                Node = ObjDesc->Reference.Node;
db2bae30SDana Myers            }
db2bae30SDana Myers
db2bae30SDana Myers            /* All "References" point to a NS node */
db2bae30SDana Myers
db2bae30SDana Myers            if (ACPI_GET_DESCRIPTOR_TYPE (Node) != ACPI_DESC_TYPE_NAMED)
db2bae30SDana Myers            {
db2bae30SDana Myers                ACPI_ERROR ((AE_INFO,
26f3cdf0SGordon Ross                    "Not a namespace node %p [%s]",
db2bae30SDana Myers                    Node, AcpiUtGetDescriptorName (Node)));
db2bae30SDana Myers                return_ACPI_STATUS (AE_AML_INTERNAL);
db2bae30SDana Myers            }
db2bae30SDana Myers
db2bae30SDana Myers            /* Get the attached object */
db2bae30SDana Myers
db2bae30SDana Myers            ObjDesc = AcpiNsGetAttachedObject (Node);
db2bae30SDana Myers            if (!ObjDesc)
db2bae30SDana Myers            {
db2bae30SDana Myers                /* No object, use the NS node type */
db2bae30SDana Myers
db2bae30SDana Myers                Type = AcpiNsGetType (Node);
db2bae30SDana Myers                goto Exit;
db2bae30SDana Myers            }
db2bae30SDana Myers
db2bae30SDana Myers            /* Check for circular references */
db2bae30SDana Myers
db2bae30SDana Myers            if (ObjDesc == Operand)
db2bae30SDana Myers            {
db2bae30SDana Myers                return_ACPI_STATUS (AE_AML_CIRCULAR_REFERENCE);
db2bae30SDana Myers            }
db2bae30SDana Myers            break;
db2bae30SDana Myers
db2bae30SDana Myers        case ACPI_REFCLASS_INDEX:
db2bae30SDana Myers
db2bae30SDana Myers            /* Get the type of this reference (index into another object) */
db2bae30SDana Myers
db2bae30SDana Myers            Type = ObjDesc->Reference.TargetType;
db2bae30SDana Myers            if (Type != ACPI_TYPE_PACKAGE)
db2bae30SDana Myers            {
db2bae30SDana Myers                goto Exit;
db2bae30SDana Myers            }
db2bae30SDana Myers
db2bae30SDana Myers            /*
db2bae30SDana Myers             * The main object is a package, we want to get the type
db2bae30SDana Myers             * of the individual package element that is referenced by
db2bae30SDana Myers             * the index.
db2bae30SDana Myers             *
db2bae30SDana Myers             * This could of course in turn be another reference object.
db2bae30SDana Myers             */
db2bae30SDana Myers            ObjDesc = *(ObjDesc->Reference.Where);
db2bae30SDana Myers            if (!ObjDesc)
db2bae30SDana Myers            {
db2bae30SDana Myers                /* NULL package elements are allowed */
db2bae30SDana Myers
db2bae30SDana Myers                Type = 0; /* Uninitialized */
db2bae30SDana Myers                goto Exit;
db2bae30SDana Myers            }
db2bae30SDana Myers            break;
db2bae30SDana Myers
db2bae30SDana Myers        case ACPI_REFCLASS_TABLE:
db2bae30SDana Myers
db2bae30SDana Myers            Type = ACPI_TYPE_DDB_HANDLE;
db2bae30SDana Myers            goto Exit;
db2bae30SDana Myers
db2bae30SDana Myers        case ACPI_REFCLASS_LOCAL:
db2bae30SDana Myers        case ACPI_REFCLASS_ARG:
db2bae30SDana Myers
db2bae30SDana Myers            if (ReturnDesc)
db2bae30SDana Myers            {
db2bae30SDana Myers                Status = AcpiDsMethodDataGetValue (ObjDesc->Reference.Class,
db2bae30SDana Myers                    ObjDesc->Reference.Value, WalkState, &ObjDesc);
db2bae30SDana Myers                if (ACPI_FAILURE (Status))
db2bae30SDana Myers                {
db2bae30SDana Myers                    return_ACPI_STATUS (Status);
db2bae30SDana Myers                }
db2bae30SDana Myers                AcpiUtRemoveReference (ObjDesc);
db2bae30SDana Myers            }
db2bae30SDana Myers            else
db2bae30SDana Myers            {
db2bae30SDana Myers                Status = AcpiDsMethodDataGetNode (ObjDesc->Reference.Class,
db2bae30SDana Myers                    ObjDesc->Reference.Value, WalkState, &Node);
db2bae30SDana Myers                if (ACPI_FAILURE (Status))
db2bae30SDana Myers                {
db2bae30SDana Myers                    return_ACPI_STATUS (Status);
db2bae30SDana Myers                }
db2bae30SDana Myers
db2bae30SDana Myers                ObjDesc = AcpiNsGetAttachedObject (Node);
db2bae30SDana Myers                if (!ObjDesc)
db2bae30SDana Myers                {
db2bae30SDana Myers                    Type = ACPI_TYPE_ANY;
db2bae30SDana Myers                    goto Exit;
db2bae30SDana Myers                }
db2bae30SDana Myers            }
db2bae30SDana Myers            break;
db2bae30SDana Myers
db2bae30SDana Myers        case ACPI_REFCLASS_DEBUG:
db2bae30SDana Myers
db2bae30SDana Myers            /* The Debug Object is of type "DebugObject" */
db2bae30SDana Myers
db2bae30SDana Myers            Type = ACPI_TYPE_DEBUG_OBJECT;
db2bae30SDana Myers            goto Exit;
db2bae30SDana Myers
db2bae30SDana Myers        default:
db2bae30SDana Myers
db2bae30SDana Myers            ACPI_ERROR ((AE_INFO,
*385cc6b4SJerry Jelinek                "Unknown Reference Class 0x%2.2X",
*385cc6b4SJerry Jelinek                ObjDesc->Reference.Class));
db2bae30SDana Myers            return_ACPI_STATUS (AE_AML_INTERNAL);
db2bae30SDana Myers        }
db2bae30SDana Myers    }
db2bae30SDana Myers
db2bae30SDana Myers    /*
db2bae30SDana Myers     * Now we are guaranteed to have an object that has not been created
db2bae30SDana Myers     * via the RefOf or Index operators.
db2bae30SDana Myers     */
aa2aa9a6SDana Myers    Type = ObjDesc->Common.Type;
db2bae30SDana Myers
db2bae30SDana Myers
db2bae30SDana MyersExit:
db2bae30SDana Myers    /* Convert internal types to external types */
db2bae30SDana Myers
db2bae30SDana Myers    switch (Type)
db2bae30SDana Myers    {
db2bae30SDana Myers    case ACPI_TYPE_LOCAL_REGION_FIELD:
db2bae30SDana Myers    case ACPI_TYPE_LOCAL_BANK_FIELD:
db2bae30SDana Myers    case ACPI_TYPE_LOCAL_INDEX_FIELD:
db2bae30SDana Myers
db2bae30SDana Myers        Type = ACPI_TYPE_FIELD_UNIT;
db2bae30SDana Myers        break;
db2bae30SDana Myers
db2bae30SDana Myers    case ACPI_TYPE_LOCAL_SCOPE:
db2bae30SDana Myers
db2bae30SDana Myers        /* Per ACPI Specification, Scope is untyped */
db2bae30SDana Myers
db2bae30SDana Myers        Type = ACPI_TYPE_ANY;
db2bae30SDana Myers        break;
db2bae30SDana Myers
db2bae30SDana Myers    default:
*385cc6b4SJerry Jelinek
db2bae30SDana Myers        /* No change to Type required */
*385cc6b4SJerry Jelinek
db2bae30SDana Myers        break;
db2bae30SDana Myers    }
db2bae30SDana Myers
db2bae30SDana Myers    *ReturnType = Type;
db2bae30SDana Myers    if (ReturnDesc)
db2bae30SDana Myers    {
db2bae30SDana Myers        *ReturnDesc = ObjDesc;
db2bae30SDana Myers    }
db2bae30SDana Myers    return_ACPI_STATUS (AE_OK);
db2bae30SDana Myers}