evrgnini.c

acpi tools for linux include acpiexec and acpixtract

        PciId->Function = ACPI_LOWORD (ACPI_LODWORD (PciValue));
    }

    /* The PCI segment number comes from the _SEG method */

    Status = AcpiUtEvaluateNumericObject (METHOD_NAME__SEG, PciRootNode, &PciValue);
    if (ACPI_SUCCESS (Status))
    {
        PciId->Segment = ACPI_LOWORD (PciValue);
    }

    /* The PCI bus number comes from the _BBN method */

    Status = AcpiUtEvaluateNumericObject (METHOD_NAME__BBN, PciRootNode, &PciValue);
    if (ACPI_SUCCESS (Status))
    {
        PciId->Bus = ACPI_LOWORD (PciValue);
    }

    /* Complete this device's PciId */

    AcpiOsDerivePciId (PciRootNode, RegionObj->Region.Node, &PciId);

    *RegionContext = PciId;
    return_ACPI_STATUS (AE_OK);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiEvMatchPciRootBridge
 *
 * PARAMETERS:  Id              - The HID/CID in string format
 *
 * RETURN:      TRUE if the Id is a match for a PCI/PCI-Express Root Bridge
 *
 * DESCRIPTION: Determine if the input ID is a PCI Root Bridge ID.
 *
 ******************************************************************************/

static BOOLEAN
AcpiEvMatchPciRootBridge (
    char                    *Id)
{

    /*
     * Check if this is a PCI root.
     * ACPI 3.0+: check for a PCI Express root also.
     */
    if (!(ACPI_STRNCMP (Id,
            PCI_ROOT_HID_STRING,
            sizeof (PCI_ROOT_HID_STRING)))      ||

        !(ACPI_STRNCMP (Id,
            PCI_EXPRESS_ROOT_HID_STRING,
            sizeof (PCI_EXPRESS_ROOT_HID_STRING))))
    {
        return (TRUE);
    }

    return (FALSE);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiEvIsPciRootBridge
 *
 * PARAMETERS:  Node            - Device node being examined
 *
 * RETURN:      TRUE if device is a PCI/PCI-Express Root Bridge
 *
 * DESCRIPTION: Determine if the input device represents a PCI Root Bridge by
 *              examining the _HID and _CID for the device.
 *
 ******************************************************************************/

static BOOLEAN
AcpiEvIsPciRootBridge (
    ACPI_NAMESPACE_NODE     *Node)
{
    ACPI_STATUS             Status;
    ACPI_DEVICE_ID          Hid;
    ACPI_COMPATIBLE_ID_LIST *Cid;
    ACPI_NATIVE_UINT        i;


    /*
     * Get the _HID and check for a PCI Root Bridge
     */
    Status = AcpiUtExecute_HID (Node, &Hid);
    if (ACPI_FAILURE (Status))
    {
        return (FALSE);
    }

    if (AcpiEvMatchPciRootBridge (Hid.Value))
    {
        return (TRUE);
    }

    /*
     * The _HID did not match.
     * Get the _CID and check for a PCI Root Bridge
     */
    Status = AcpiUtExecute_CID (Node, &Cid);
    if (ACPI_FAILURE (Status))
    {
        return (FALSE);
    }

    /* Check all _CIDs in the returned list */

    for (i = 0; i < Cid->Count; i++)
    {
        if (AcpiEvMatchPciRootBridge (Cid->Id[i].Value))
        {
            ACPI_FREE (Cid);
            return (TRUE);
        }
    }

    ACPI_FREE (Cid);
    return (FALSE);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiEvPciBarRegionSetup
 *
 * PARAMETERS:  Handle              - Region we are interested in
 *              Function            - Start or stop
 *              HandlerContext      - Address space handler context
 *              RegionContext       - Region specific context
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Setup a PciBAR operation region
 *
 * MUTEX:       Assumes namespace is not locked
 *
 ******************************************************************************/

ACPI_STATUS
AcpiEvPciBarRegionSetup (
    ACPI_HANDLE             Handle,
    UINT32                  Function,
    void                    *HandlerContext,
    void                    **RegionContext)
{
    ACPI_FUNCTION_TRACE (EvPciBarRegionSetup);


    return_ACPI_STATUS (AE_OK);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiEvCmosRegionSetup
 *
 * PARAMETERS:  Handle              - Region we are interested in
 *              Function            - Start or stop
 *              HandlerContext      - Address space handler context
 *              RegionContext       - Region specific context
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Setup a CMOS operation region
 *
 * MUTEX:       Assumes namespace is not locked
 *
 ******************************************************************************/

ACPI_STATUS
AcpiEvCmosRegionSetup (
    ACPI_HANDLE             Handle,
    UINT32                  Function,
    void                    *HandlerContext,
    void                    **RegionContext)
{
    ACPI_FUNCTION_TRACE (EvCmosRegionSetup);


    return_ACPI_STATUS (AE_OK);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiEvDefaultRegionSetup
 *
 * PARAMETERS:  Handle              - Region we are interested in
 *              Function            - Start or stop
 *              HandlerContext      - Address space handler context
 *              RegionContext       - Region specific context
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Default region initialization
 *
 ******************************************************************************/

ACPI_STATUS
AcpiEvDefaultRegionSetup (
    ACPI_HANDLE             Handle,
    UINT32                  Function,
    void                    *HandlerContext,
    void                    **RegionContext)
{
    ACPI_FUNCTION_TRACE (EvDefaultRegionSetup);


    if (Function == ACPI_REGION_DEACTIVATE)
    {
        *RegionContext = NULL;
    }
    else
    {
        *RegionContext = HandlerContext;
    }

    return_ACPI_STATUS (AE_OK);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiEvInitializeRegion
 *
 * PARAMETERS:  RegionObj       - Region we are initializing
 *              AcpiNsLocked    - Is namespace locked?
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Initializes the region, finds any _REG methods and saves them
 *              for execution at a later time
 *
 *              Get the appropriate address space handler for a newly
 *              created region.
 *
 *              This also performs address space specific initialization.  For
 *              example, PCI regions must have an _ADR object that contains
 *              a PCI address in the scope of the definition.  This address is
 *              required to perform an access to PCI config space.
 *
 * MUTEX:       Interpreter should be unlocked, because we may run the _REG
 *              method for this region.
 *
 ******************************************************************************/

ACPI_STATUS
AcpiEvInitializeRegion (
    ACPI_OPERAND_OBJECT     *RegionObj,
    BOOLEAN                 AcpiNsLocked)
{
    ACPI_OPERAND_OBJECT     *HandlerObj;
    ACPI_OPERAND_OBJECT     *ObjDesc;
    ACPI_ADR_SPACE_TYPE     SpaceId;
    ACPI_NAMESPACE_NODE     *Node;
    ACPI_STATUS             Status;
    ACPI_NAMESPACE_NODE     *MethodNode;
    ACPI_NAME               *RegNamePtr = (ACPI_NAME *) METHOD_NAME__REG;
    ACPI_OPERAND_OBJECT     *RegionObj2;


    ACPI_FUNCTION_TRACE_U32 (EvInitializeRegion, AcpiNsLocked);


    if (!RegionObj)
    {
        return_ACPI_STATUS (AE_BAD_PARAMETER);
    }

    if (RegionObj->Common.Flags & AOPOBJ_OBJECT_INITIALIZED)
    {
        return_ACPI_STATUS (AE_OK);
    }

    RegionObj2 = AcpiNsGetSecondaryObject (RegionObj);
    if (!RegionObj2)
    {
        return_ACPI_STATUS (AE_NOT_EXIST);
    }

    Node = AcpiNsGetParentNode (RegionObj->Region.Node);
    SpaceId = RegionObj->Region.SpaceId;

    /* Setup defaults */

    RegionObj->Region.Handler = NULL;
    RegionObj2->Extra.Method_REG = NULL;
    RegionObj->Common.Flags &= ~(AOPOBJ_SETUP_COMPLETE);
    RegionObj->Common.Flags |= AOPOBJ_OBJECT_INITIALIZED;

    /* Find any "_REG" method associated with this region definition */

    Status = AcpiNsSearchOneScope (
                *RegNamePtr, Node, ACPI_TYPE_METHOD, &MethodNode);
    if (ACPI_SUCCESS (Status))
    {
        /*
         * The _REG method is optional and there can be only one per region
         * definition.  This will be executed when the handler is attached
         * or removed
         */
        RegionObj2->Extra.Method_REG = MethodNode;
    }

    /*
     * The following loop depends upon the root Node having no parent
     * ie: AcpiGbl_RootNode->ParentEntry being set to NULL
     */
    while (Node)
    {
        /* Check to see if a handler exists */

        HandlerObj = NULL;
        ObjDesc = AcpiNsGetAttachedObject (Node);
        if (ObjDesc)
        {
            /* Can only be a handler if the object exists */

            switch (Node->Type)
            {
            case ACPI_TYPE_DEVICE:

                HandlerObj = ObjDesc->Device.Handler;
                break;

            case ACPI_TYPE_PROCESSOR:

                HandlerObj = ObjDesc->Processor.Handler;
                break;

            case ACPI_TYPE_THERMAL:

                HandlerObj = ObjDesc->ThermalZone.Handler;
                break;

            default:
                /* Ignore other objects */
                break;
            }

            while (HandlerObj)
            {
                /* Is this handler of the correct type? */

                if (HandlerObj->AddressSpace.SpaceId == SpaceId)
                {
                    /* Found correct handler */

                    ACPI_DEBUG_PRINT ((ACPI_DB_OPREGION,
                        "Found handler %p for region %p in obj %p\n",
                        HandlerObj, RegionObj, ObjDesc));

                    Status = AcpiEvAttachRegion (HandlerObj, RegionObj,
                                AcpiNsLocked);

                    /*
                     * Tell all users that this region is usable by running the _REG
                     * method
                     */
                    if (AcpiNsLocked)
                    {
                        Status = AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE);
                        if (ACPI_FAILURE (Status))
                        {
                            return_ACPI_STATUS (Status);
                        }
                    }

                    Status = AcpiEvExecuteRegMethod (RegionObj, 1);

                    if (AcpiNsLocked)
                    {
                        Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE);
                        if (ACPI_FAILURE (Status))
                        {
                            return_ACPI_STATUS (Status);
                        }
                    }

                    return_ACPI_STATUS (AE_OK);
                }

                /* Try next handler in the list */

                HandlerObj = HandlerObj->AddressSpace.Next;
            }
        }

        /*
         * This node does not have the handler we need;
         * Pop up one level
         */
        Node = AcpiNsGetParentNode (Node);
    }

    /* If we get here, there is no handler for this region */

    ACPI_DEBUG_PRINT ((ACPI_DB_OPREGION,
        "No handler for RegionType %s(%X) (RegionObj %p)\n",
        AcpiUtGetRegionName (SpaceId), SpaceId, RegionObj));

    return_ACPI_STATUS (AE_NOT_EXIST);
}