dswload.c

acpi tools for linux include acpiexec and acpixtract

    if (ACPI_FAILURE (Status))
    {
        ACPI_ERROR_NAMESPACE (BufferPtr, Status);
        return_ACPI_STATUS (Status);
    }

    if (!Op)
    {
        /* Create a new op */

        Op = AcpiPsAllocOp (WalkState->Opcode);
        if (!Op)
        {
            return_ACPI_STATUS (AE_NO_MEMORY);
        }

        /* Initialize the new op */

        if (Node)
        {
            Op->Named.Name = Node->Name.Integer;
        }
        *OutOp = Op;
    }

    /*
     * Put the Node in the "op" object that the parser uses, so we
     * can get it again quickly when this scope is closed
     */
    Op->Common.Node = Node;
    return_ACPI_STATUS (Status);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiDsLoad2EndOp
 *
 * PARAMETERS:  WalkState       - Current state of the parse tree walk
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Ascending callback used during the loading of the namespace,
 *              both control methods and everything else.
 *
 ******************************************************************************/

ACPI_STATUS
AcpiDsLoad2EndOp (
    ACPI_WALK_STATE         *WalkState)
{
    ACPI_PARSE_OBJECT       *Op;
    ACPI_STATUS             Status = AE_OK;
    ACPI_OBJECT_TYPE        ObjectType;
    ACPI_NAMESPACE_NODE     *Node;
    ACPI_PARSE_OBJECT       *Arg;
    ACPI_NAMESPACE_NODE     *NewNode;
#ifndef ACPI_NO_METHOD_EXECUTION
    UINT32                  i;
    UINT8                   RegionSpace;
#endif


    ACPI_FUNCTION_TRACE (DsLoad2EndOp);

    Op = WalkState->Op;
    ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, "Opcode [%s] Op %p State %p\n",
            WalkState->OpInfo->Name, Op, WalkState));

    /* Check if opcode had an associated namespace object */

    if (!(WalkState->OpInfo->Flags & AML_NSOBJECT))
    {
#ifndef ACPI_NO_METHOD_EXECUTION
#ifdef ACPI_ENABLE_MODULE_LEVEL_CODE
        /* No namespace object. Executable opcode? */

        if ((WalkState->OpInfo->Class == AML_CLASS_EXECUTE) ||
            (WalkState->OpInfo->Class == AML_CLASS_CONTROL))
        {
            ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
                "End/EXEC:   %s (fl %8.8X)\n", WalkState->OpInfo->Name,
                WalkState->OpInfo->Flags));

            /* Executing a type1 or type2 opcode outside of a method */

            Status = AcpiDsExecEndOp (WalkState);
            return_ACPI_STATUS (Status);
        }
#endif
#endif
        return_ACPI_STATUS (AE_OK);
    }

    if (Op->Common.AmlOpcode == AML_SCOPE_OP)
    {
        ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
            "Ending scope Op=%p State=%p\n", Op, WalkState));
    }

    ObjectType = WalkState->OpInfo->ObjectType;

    /*
     * Get the Node/name from the earlier lookup
     * (It was saved in the *op structure)
     */
    Node = Op->Common.Node;

    /*
     * Put the Node on the object stack (Contains the ACPI Name of
     * this object)
     */
    WalkState->Operands[0] = (void *) Node;
    WalkState->NumOperands = 1;

    /* Pop the scope stack */

    if (AcpiNsOpensScope (ObjectType) &&
       (Op->Common.AmlOpcode != AML_INT_METHODCALL_OP))
    {
        ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, "(%s) Popping scope for Op %p\n",
            AcpiUtGetTypeName (ObjectType), Op));

        Status = AcpiDsScopeStackPop (WalkState);
        if (ACPI_FAILURE (Status))
        {
            goto Cleanup;
        }
    }

    /*
     * Named operations are as follows:
     *
     * AML_ALIAS
     * AML_BANKFIELD
     * AML_CREATEBITFIELD
     * AML_CREATEBYTEFIELD
     * AML_CREATEDWORDFIELD
     * AML_CREATEFIELD
     * AML_CREATEQWORDFIELD
     * AML_CREATEWORDFIELD
     * AML_DATA_REGION
     * AML_DEVICE
     * AML_EVENT
     * AML_FIELD
     * AML_INDEXFIELD
     * AML_METHOD
     * AML_METHODCALL
     * AML_MUTEX
     * AML_NAME
     * AML_NAMEDFIELD
     * AML_OPREGION
     * AML_POWERRES
     * AML_PROCESSOR
     * AML_SCOPE
     * AML_THERMALZONE
     */

    ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
        "Create-Load [%s] State=%p Op=%p NamedObj=%p\n",
        AcpiPsGetOpcodeName (Op->Common.AmlOpcode), WalkState, Op, Node));

    /* Decode the opcode */

    Arg = Op->Common.Value.Arg;

    switch (WalkState->OpInfo->Type)
    {
#ifndef ACPI_NO_METHOD_EXECUTION

    case AML_TYPE_CREATE_FIELD:
        /*
         * Create the field object, but the field buffer and index must
         * be evaluated later during the execution phase
         */
        Status = AcpiDsCreateBufferField (Op, WalkState);
        break;


     case AML_TYPE_NAMED_FIELD:
        /*
         * If we are executing a method, initialize the field
         */
        if (WalkState->MethodNode)
        {
            Status = AcpiDsInitFieldObjects (Op, WalkState);
        }

        switch (Op->Common.AmlOpcode)
        {
        case AML_INDEX_FIELD_OP:

            Status = AcpiDsCreateIndexField (Op, (ACPI_HANDLE) Arg->Common.Node,
                        WalkState);
            break;

        case AML_BANK_FIELD_OP:

            Status = AcpiDsCreateBankField (Op, Arg->Common.Node, WalkState);
            break;

        case AML_FIELD_OP:

            Status = AcpiDsCreateField (Op, Arg->Common.Node, WalkState);
            break;

        default:
            /* All NAMED_FIELD opcodes must be handled above */
            break;
        }
        break;


     case AML_TYPE_NAMED_SIMPLE:

        Status = AcpiDsCreateOperands (WalkState, Arg);
        if (ACPI_FAILURE (Status))
        {
            goto Cleanup;
        }

        switch (Op->Common.AmlOpcode)
        {
        case AML_PROCESSOR_OP:

            Status = AcpiExCreateProcessor (WalkState);
            break;

        case AML_POWER_RES_OP:

            Status = AcpiExCreatePowerResource (WalkState);
            break;

        case AML_MUTEX_OP:

            Status = AcpiExCreateMutex (WalkState);
            break;

        case AML_EVENT_OP:

            Status = AcpiExCreateEvent (WalkState);
            break;


        case AML_ALIAS_OP:

            Status = AcpiExCreateAlias (WalkState);
            break;

        default:
            /* Unknown opcode */

            Status = AE_OK;
            goto Cleanup;
        }

        /* Delete operands */

        for (i = 1; i < WalkState->NumOperands; i++)
        {
            AcpiUtRemoveReference (WalkState->Operands[i]);
            WalkState->Operands[i] = NULL;
        }

        break;
#endif /* ACPI_NO_METHOD_EXECUTION */

    case AML_TYPE_NAMED_COMPLEX:

        switch (Op->Common.AmlOpcode)
        {
#ifndef ACPI_NO_METHOD_EXECUTION
        case AML_REGION_OP:
        case AML_DATA_REGION_OP:

            if (Op->Common.AmlOpcode == AML_REGION_OP)
            {
                RegionSpace = (ACPI_ADR_SPACE_TYPE)
                      ((Op->Common.Value.Arg)->Common.Value.Integer);
            }
            else
            {
                RegionSpace = REGION_DATA_TABLE;
            }

            /*
             * If we are executing a method, initialize the region
             */
            if (WalkState->MethodNode)
            {
                Status = AcpiExCreateRegion (Op->Named.Data, Op->Named.Length,
                            RegionSpace, WalkState);
                if (ACPI_FAILURE (Status))
                {
                    return (Status);
                }
            }

            /*
             * The OpRegion is not fully parsed at this time. Only valid
             * argument is the SpaceId. (We must save the address of the
             * AML of the address and length operands)
             */

            /*
             * If we have a valid region, initialize it
             * Namespace is NOT locked at this point.
             *
             * TBD: need to unlock interpreter if it is locked, in order
             * to allow _REG methods to be run.
             */
            Status = AcpiEvInitializeRegion (AcpiNsGetAttachedObject (Node),
                        FALSE);
            if (ACPI_FAILURE (Status))
            {
                /*
                 *  If AE_NOT_EXIST is returned, it is not fatal
                 *  because many regions get created before a handler
                 *  is installed for said region.
                 */
                if (AE_NOT_EXIST == Status)
                {
                    Status = AE_OK;
                }
            }
            break;


        case AML_NAME_OP:

            Status = AcpiDsCreateNode (WalkState, Node, Op);
            break;


        case AML_METHOD_OP:
            /*
             * MethodOp PkgLength NameString MethodFlags TermList
             *
             * Note: We must create the method node/object pair as soon as we
             * see the method declaration. This allows later pass1 parsing
             * of invocations of the method (need to know the number of
             * arguments.)
             */
            ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
                "LOADING-Method: State=%p Op=%p NamedObj=%p\n",
                WalkState, Op, Op->Named.Node));

            if (!AcpiNsGetAttachedObject (Op->Named.Node))
            {
                WalkState->Operands[0] = ACPI_CAST_PTR (void, Op->Named.Node);
                WalkState->NumOperands = 1;

                Status = AcpiDsCreateOperands (WalkState, Op->Common.Value.Arg);
                if (ACPI_SUCCESS (Status))
                {
                    Status = AcpiExCreateMethod (Op->Named.Data,
                                        Op->Named.Length, WalkState);
                }
                WalkState->Operands[0] = NULL;
                WalkState->NumOperands = 0;

                if (ACPI_FAILURE (Status))
                {
                    return_ACPI_STATUS (Status);
                }
            }
            break;

#endif /* ACPI_NO_METHOD_EXECUTION */

        default:
            /* All NAMED_COMPLEX opcodes must be handled above */
            break;
        }
        break;


    case AML_CLASS_INTERNAL:

        /* case AML_INT_NAMEPATH_OP: */
        break;


    case AML_CLASS_METHOD_CALL:

        ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
            "RESOLVING-MethodCall: State=%p Op=%p NamedObj=%p\n",
            WalkState, Op, Node));

        /*
         * Lookup the method name and save the Node
         */
        Status = AcpiNsLookup (WalkState->ScopeInfo, Arg->Common.Value.String,
                        ACPI_TYPE_ANY, ACPI_IMODE_LOAD_PASS2,
                        ACPI_NS_SEARCH_PARENT | ACPI_NS_DONT_OPEN_SCOPE,
                        WalkState, &(NewNode));
        if (ACPI_SUCCESS (Status))
        {
            /*
             * Make sure that what we found is indeed a method
             * We didn't search for a method on purpose, to see if the name
             * would resolve
             */
            if (NewNode->Type != ACPI_TYPE_METHOD)
            {
                Status = AE_AML_OPERAND_TYPE;
            }

            /* We could put the returned object (Node) on the object stack for
             * later, but for now, we will put it in the "op" object that the
             * parser uses, so we can get it again at the end of this scope
             */
            Op->Common.Node = NewNode;
        }
        else
        {
            ACPI_ERROR_NAMESPACE (Arg->Common.Value.String, Status);
        }
        break;


    default:
        break;
    }

Cleanup:

    /* Remove the Node pushed at the very beginning */

    WalkState->Operands[0] = NULL;
    WalkState->NumOperands = 0;
    return_ACPI_STATUS (Status);
}