exresolv.c File Reference

#include "acpi.h"
#include "accommon.h"
#include "amlcode.h"
#include "acdispat.h"
#include "acinterp.h"
#include "acnamesp.h"

Include dependency graph for exresolv.c:

Go to the source code of this file.

Macros
#define	_COMPONENT   ACPI_EXECUTER

Functions
static ACPI_STATUS	AcpiExResolveObjectToValue (ACPI_OPERAND_OBJECT **StackPtr, ACPI_WALK_STATE *WalkState)
ACPI_STATUS	AcpiExResolveToValue (ACPI_OPERAND_OBJECT **StackPtr, ACPI_WALK_STATE *WalkState)
ACPI_STATUS	AcpiExResolveMultiple (ACPI_WALK_STATE *WalkState, ACPI_OPERAND_OBJECT *Operand, ACPI_OBJECT_TYPE *ReturnType, ACPI_OPERAND_OBJECT **ReturnDesc)

Macro Definition Documentation

_COMPONENT

#define _COMPONENT   ACPI_EXECUTER

Definition at line 52 of file exresolv.c.

Function Documentation

AcpiExResolveMultiple()

ACPI_STATUS AcpiExResolveMultiple	(	ACPI_WALK_STATE *	WalkState,
		ACPI_OPERAND_OBJECT *	Operand,
		ACPI_OBJECT_TYPE *	ReturnType,
		ACPI_OPERAND_OBJECT **	ReturnDesc
	)

Definition at line 350 of file exresolv.c.

{
    ACPI_OPERAND_OBJECT     *ObjDesc = ACPI_CAST_PTR (void, Operand);
    ACPI_NAMESPACE_NODE     *Node = ACPI_CAST_PTR (ACPI_NAMESPACE_NODE, Operand);
    ACPI_OBJECT_TYPE        Type;
    ACPI_STATUS             Status;
 
 
    ACPI_FUNCTION_TRACE (AcpiExResolveMultiple);
 
 
    /* Operand can be either a namespace node or an operand descriptor */
 
    switch (ACPI_GET_DESCRIPTOR_TYPE (ObjDesc))
    {
    case ACPI_DESC_TYPE_OPERAND:
 
        Type = ObjDesc->Common.Type;
        break;
 
    case ACPI_DESC_TYPE_NAMED:
 
        Type = ((ACPI_NAMESPACE_NODE *) ObjDesc)->Type;
        ObjDesc = AcpiNsGetAttachedObject (Node);
 
        /* If we had an Alias node, use the attached object for type info */
 
        if (Type == ACPI_TYPE_LOCAL_ALIAS)
        {
            Type = ((ACPI_NAMESPACE_NODE *) ObjDesc)->Type;
            ObjDesc = AcpiNsGetAttachedObject (
                (ACPI_NAMESPACE_NODE *) ObjDesc);
        }
 
        switch (Type)
        {
        case ACPI_TYPE_DEVICE:
        case ACPI_TYPE_THERMAL:
 
            /* These types have no attached subobject */
            break;
 
        default:
 
            /* All other types require a subobject */
 
            if (!ObjDesc)
            {
                ACPI_ERROR ((AE_INFO,
                    "[%4.4s] Node is unresolved or uninitialized",
                    AcpiUtGetNodeName (Node)));
                return_ACPI_STATUS (AE_AML_UNINITIALIZED_NODE);
            }
            break;
        }
        break;
 
    default:
        return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
    }
 
    /* If type is anything other than a reference, we are done */
 
    if (Type != ACPI_TYPE_LOCAL_REFERENCE)
    {
        goto Exit;
    }
 
    /*
     * For reference objects created via the RefOf, Index, or Load/LoadTable
     * operators, we need to get to the base object (as per the ACPI
     * specification of the ObjectType and SizeOf operators). This means
     * traversing the list of possibly many nested references.
     */
    while (ObjDesc->Common.Type == ACPI_TYPE_LOCAL_REFERENCE)
    {
        switch (ObjDesc->Reference.Class)
        {
        case ACPI_REFCLASS_REFOF:
        case ACPI_REFCLASS_NAME:
 
            /* Dereference the reference pointer */
 
            if (ObjDesc->Reference.Class == ACPI_REFCLASS_REFOF)
            {
                Node = ObjDesc->Reference.Object;
            }
            else /* AML_INT_NAMEPATH_OP */
            {
                Node = ObjDesc->Reference.Node;
            }
 
            /* All "References" point to a NS node */
 
            if (ACPI_GET_DESCRIPTOR_TYPE (Node) != ACPI_DESC_TYPE_NAMED)
            {
                ACPI_ERROR ((AE_INFO,
                    "Not a namespace node %p [%s]",
                    Node, AcpiUtGetDescriptorName (Node)));
                return_ACPI_STATUS (AE_AML_INTERNAL);
            }
 
            /* Get the attached object */
 
            ObjDesc = AcpiNsGetAttachedObject (Node);
            if (!ObjDesc)
            {
                /* No object, use the NS node type */
 
                Type = AcpiNsGetType (Node);
                goto Exit;
            }
 
            /* Check for circular references */
 
            if (ObjDesc == Operand)
            {
                return_ACPI_STATUS (AE_AML_CIRCULAR_REFERENCE);
            }
            break;
 
        case ACPI_REFCLASS_INDEX:
 
            /* Get the type of this reference (index into another object) */
 
            Type = ObjDesc->Reference.TargetType;
            if (Type != ACPI_TYPE_PACKAGE)
            {
                goto Exit;
            }
 
            /*
             * The main object is a package, we want to get the type
             * of the individual package element that is referenced by
             * the index.
             *
             * This could of course in turn be another reference object.
             */
            ObjDesc = *(ObjDesc->Reference.Where);
            if (!ObjDesc)
            {
                /* NULL package elements are allowed */
 
                Type = 0; /* Uninitialized */
                goto Exit;
            }
            break;
 
        case ACPI_REFCLASS_TABLE:
 
            Type = ACPI_TYPE_DDB_HANDLE;
            goto Exit;
 
        case ACPI_REFCLASS_LOCAL:
        case ACPI_REFCLASS_ARG:
 
            if (ReturnDesc)
            {
                Status = AcpiDsMethodDataGetValue (ObjDesc->Reference.Class,
                    ObjDesc->Reference.Value, WalkState, &ObjDesc);
                if (ACPI_FAILURE (Status))
                {
                    return_ACPI_STATUS (Status);
                }
                AcpiUtRemoveReference (ObjDesc);
            }
            else
            {
                Status = AcpiDsMethodDataGetNode (ObjDesc->Reference.Class,
                    ObjDesc->Reference.Value, WalkState, &Node);
                if (ACPI_FAILURE (Status))
                {
                    return_ACPI_STATUS (Status);
                }
 
                ObjDesc = AcpiNsGetAttachedObject (Node);
                if (!ObjDesc)
                {
                    Type = ACPI_TYPE_ANY;
                    goto Exit;
                }
            }
            break;
 
        case ACPI_REFCLASS_DEBUG:
 
            /* The Debug Object is of type "DebugObject" */
 
            Type = ACPI_TYPE_DEBUG_OBJECT;
            goto Exit;
 
        default:
 
            ACPI_ERROR ((AE_INFO,
                "Unknown Reference Class 0x%2.2X",
                ObjDesc->Reference.Class));
            return_ACPI_STATUS (AE_AML_INTERNAL);
        }
    }
 
    /*
     * Now we are guaranteed to have an object that has not been created
     * via the RefOf or Index operators.
     */
    Type = ObjDesc->Common.Type;
 
 
Exit:
    /* Convert internal types to external types */
 
    switch (Type)
    {
    case ACPI_TYPE_LOCAL_REGION_FIELD:
    case ACPI_TYPE_LOCAL_BANK_FIELD:
    case ACPI_TYPE_LOCAL_INDEX_FIELD:
 
        Type = ACPI_TYPE_FIELD_UNIT;
        break;
 
    case ACPI_TYPE_LOCAL_SCOPE:
 
        /* Per ACPI Specification, Scope is untyped */
 
        Type = ACPI_TYPE_ANY;
        break;
 
    default:
 
        /* No change to Type required */
 
        break;
    }
 
    *ReturnType = Type;
    if (ReturnDesc)
    {
        *ReturnDesc = ObjDesc;
    }
    return_ACPI_STATUS (AE_OK);
}

Referenced by AcpiExOpcode_1A_0T_1R(), and AcpiExResolveMultiple().

AcpiExResolveObjectToValue()

static ACPI_STATUS AcpiExResolveObjectToValue ( ACPI_OPERAND_OBJECT **  StackPtr, ACPI_WALK_STATE *  WalkState  )

static

Definition at line 150 of file exresolv.c.

{
    ACPI_STATUS             Status = AE_OK;
    ACPI_OPERAND_OBJECT     *StackDesc;
    ACPI_OPERAND_OBJECT     *ObjDesc = NULL;
    UINT8                   RefType;
 
 
    ACPI_FUNCTION_TRACE (ExResolveObjectToValue);
 
 
    StackDesc = *StackPtr;
 
    /* This is an object of type ACPI_OPERAND_OBJECT */
 
    switch (StackDesc->Common.Type)
    {
    case ACPI_TYPE_LOCAL_REFERENCE:
 
        RefType = StackDesc->Reference.Class;
 
        switch (RefType)
        {
        case ACPI_REFCLASS_LOCAL:
        case ACPI_REFCLASS_ARG:
            /*
             * Get the local from the method's state info
             * Note: this increments the local's object reference count
             */
            Status = AcpiDsMethodDataGetValue (RefType,
                StackDesc->Reference.Value, WalkState, &ObjDesc);
            if (ACPI_FAILURE (Status))
            {
                return_ACPI_STATUS (Status);
            }
 
            ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "[Arg/Local %X] ValueObj is %p\n",
                StackDesc->Reference.Value, ObjDesc));
 
            /*
             * Now we can delete the original Reference Object and
             * replace it with the resolved value
             */
            AcpiUtRemoveReference (StackDesc);
            *StackPtr = ObjDesc;
            break;
 
        case ACPI_REFCLASS_INDEX:
 
            switch (StackDesc->Reference.TargetType)
            {
            case ACPI_TYPE_BUFFER_FIELD:
 
                /* Just return - do not dereference */
                break;
 
            case ACPI_TYPE_PACKAGE:
 
                /* If method call or CopyObject - do not dereference */
 
                if ((WalkState->Opcode == AML_INT_METHODCALL_OP) ||
                    (WalkState->Opcode == AML_COPY_OBJECT_OP))
                {
                    break;
                }
 
                /* Otherwise, dereference the PackageIndex to a package element */
 
                ObjDesc = *StackDesc->Reference.Where;
                if (ObjDesc)
                {
                    /*
                     * Valid object descriptor, copy pointer to return value
                     * (i.e., dereference the package index)
                     * Delete the ref object, increment the returned object
                     */
                    AcpiUtAddReference (ObjDesc);
                    *StackPtr = ObjDesc;
                }
                else
                {
                    /*
                     * A NULL object descriptor means an uninitialized element of
                     * the package, can't dereference it
                     */
                    ACPI_ERROR ((AE_INFO,
                        "Attempt to dereference an Index to "
                        "NULL package element Idx=%p",
                        StackDesc));
                    Status = AE_AML_UNINITIALIZED_ELEMENT;
                }
                break;
 
            default:
 
                /* Invalid reference object */
 
                ACPI_ERROR ((AE_INFO,
                    "Unknown TargetType 0x%X in Index/Reference object %p",
                    StackDesc->Reference.TargetType, StackDesc));
                Status = AE_AML_INTERNAL;
                break;
            }
            break;
 
        case ACPI_REFCLASS_REFOF:
        case ACPI_REFCLASS_DEBUG:
        case ACPI_REFCLASS_TABLE:
 
            /* Just leave the object as-is, do not dereference */
 
            break;
 
        case ACPI_REFCLASS_NAME:   /* Reference to a named object */
 
            /* Dereference the name */
 
            if ((StackDesc->Reference.Node->Type == ACPI_TYPE_DEVICE) ||
                (StackDesc->Reference.Node->Type == ACPI_TYPE_THERMAL))
            {
                /* These node types do not have 'real' subobjects */
 
                *StackPtr = (void *) StackDesc->Reference.Node;
            }
            else
            {
                /* Get the object pointed to by the namespace node */
 
                *StackPtr = (StackDesc->Reference.Node)->Object;
                AcpiUtAddReference (*StackPtr);
            }
 
            AcpiUtRemoveReference (StackDesc);
            break;
 
        default:
 
            ACPI_ERROR ((AE_INFO,
                "Unknown Reference type 0x%X in %p",
                RefType, StackDesc));
            Status = AE_AML_INTERNAL;
            break;
        }
        break;
 
    case ACPI_TYPE_BUFFER:
 
        Status = AcpiDsGetBufferArguments (StackDesc);
        break;
 
    case ACPI_TYPE_PACKAGE:
 
        Status = AcpiDsGetPackageArguments (StackDesc);
        break;
 
    case ACPI_TYPE_BUFFER_FIELD:
    case ACPI_TYPE_LOCAL_REGION_FIELD:
    case ACPI_TYPE_LOCAL_BANK_FIELD:
    case ACPI_TYPE_LOCAL_INDEX_FIELD:
 
        ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
            "FieldRead SourceDesc=%p Type=%X\n",
            StackDesc, StackDesc->Common.Type));
 
        Status = AcpiExReadDataFromField (WalkState, StackDesc, &ObjDesc);
 
        /* Remove a reference to the original operand, then override */
 
        AcpiUtRemoveReference (*StackPtr);
        *StackPtr = (void *) ObjDesc;
        break;
 
    default:
 
        break;
    }
 
    return_ACPI_STATUS (Status);
}

Referenced by AcpiExResolveToValue().

AcpiExResolveToValue()

ACPI_STATUS AcpiExResolveToValue	(	ACPI_OPERAND_OBJECT **	StackPtr,
		ACPI_WALK_STATE *	WalkState
	)

Definition at line 79 of file exresolv.c.

{
    ACPI_STATUS             Status;
 
 
    ACPI_FUNCTION_TRACE_PTR (ExResolveToValue, StackPtr);
 
 
    if (!StackPtr || !*StackPtr)
    {
        ACPI_ERROR ((AE_INFO, "Internal - null pointer"));
        return_ACPI_STATUS (AE_AML_NO_OPERAND);
    }
 
    /*
     * The entity pointed to by the StackPtr can be either
     * 1) A valid ACPI_OPERAND_OBJECT, or
     * 2) A ACPI_NAMESPACE_NODE (NamedObj)
     */
    if (ACPI_GET_DESCRIPTOR_TYPE (*StackPtr) == ACPI_DESC_TYPE_OPERAND)
    {
        Status = AcpiExResolveObjectToValue (StackPtr, WalkState);
        if (ACPI_FAILURE (Status))
        {
            return_ACPI_STATUS (Status);
        }
 
        if (!*StackPtr)
        {
            ACPI_ERROR ((AE_INFO, "Internal - null pointer"));
            return_ACPI_STATUS (AE_AML_NO_OPERAND);
        }
    }
 
    /*
     * Object on the stack may have changed if AcpiExResolveObjectToValue()
     * was called (i.e., we can't use an _else_ here.)
     */
    if (ACPI_GET_DESCRIPTOR_TYPE (*StackPtr) == ACPI_DESC_TYPE_NAMED)
    {
        Status = AcpiExResolveNodeToValue (
            ACPI_CAST_INDIRECT_PTR (ACPI_NAMESPACE_NODE, StackPtr),
            WalkState);
        if (ACPI_FAILURE (Status))
        {
            return_ACPI_STATUS (Status);
        }
    }
 
    ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Resolved object %p\n", *StackPtr));
    return_ACPI_STATUS (AE_OK);
}

Referenced by AcpiDsEvalBankFieldOperands(), AcpiDsEvaluateNamePath(), AcpiDsExecEndControlOp(), AcpiDsGetPredicateValue(), AcpiDsResolveOperands(), AcpiExResolveObject(), and AcpiExResolveOperands().