static ACPI_STATUS
AcpiDbDisplayNonRootHandlers (
    ACPI_HANDLE             ObjHandle,
    UINT32                  NestingLevel,
    void                    *Context,
    void                    **ReturnValue)
{
    ACPI_NAMESPACE_NODE     *Node = ACPI_CAST_PTR (ACPI_NAMESPACE_NODE, ObjHandle);
    ACPI_OPERAND_OBJECT     *ObjDesc;
    ACPI_OPERAND_OBJECT     *HandlerObj;
    char                    *Pathname;


    ObjDesc = AcpiNsGetAttachedObject (Node);
    if (!ObjDesc)
    {
        return (AE_OK);
    }

    Pathname = AcpiNsGetNormalizedPathname (Node, TRUE);
    if (!Pathname)
    {
        return (AE_OK);
    }

    /* Display all handlers associated with this device */

    HandlerObj = ObjDesc->Device.Handler;
    while (HandlerObj)
    {
        AcpiOsPrintf (ACPI_PREDEFINED_PREFIX,
            AcpiUtGetRegionName ((UINT8) HandlerObj->AddressSpace.SpaceId),
            HandlerObj->AddressSpace.SpaceId);

        AcpiOsPrintf (ACPI_HANDLER_PRESENT_STRING2,
            (HandlerObj->AddressSpace.HandlerFlags &
                ACPI_ADDR_HANDLER_DEFAULT_INSTALLED) ? "Default" : "User",
            HandlerObj->AddressSpace.Handler);

        AcpiOsPrintf (" Device Name: %s (%p)\n", Pathname, Node);

        HandlerObj = HandlerObj->AddressSpace.Next;
    }

    ACPI_FREE (Pathname);
    return (AE_OK);
}

ACPI_STATUS
AcpiHwWrite (
    UINT32                  Value,
    ACPI_GENERIC_ADDRESS    *Reg)
{
    UINT64                  Address;
    ACPI_STATUS             Status;


    ACPI_FUNCTION_NAME (HwWrite);


    /* Validate contents of the GAS register */

    Status = AcpiHwValidateRegister (Reg, 32, &Address);
    if (ACPI_FAILURE (Status))
    {
        return (Status);
    }

    /*
     * Two address spaces supported: Memory or IO. PCI_Config is
     * not supported here because the GAS structure is insufficient
     */
    if (Reg->SpaceId == ACPI_ADR_SPACE_SYSTEM_MEMORY)
    {
        Status = AcpiOsWriteMemory ((ACPI_PHYSICAL_ADDRESS)
                    Address, (UINT64) Value, Reg->BitWidth);
    }
    else /* ACPI_ADR_SPACE_SYSTEM_IO, validated earlier */
    {
        Status = AcpiHwWritePort ((ACPI_IO_ADDRESS)
                    Address, Value, Reg->BitWidth);
    }

    ACPI_DEBUG_PRINT ((ACPI_DB_IO,
        "Wrote: %8.8X width %2d   to %8.8X%8.8X (%s)\n",
        Value, Reg->BitWidth, ACPI_FORMAT_UINT64 (Address),
        AcpiUtGetRegionName (Reg->SpaceId)));

    return (Status);
}

//.........这里部分代码省略.........
             */
            BitLength = ObjDesc->CommonField.BitLength;
            ByteLength = ACPI_ROUND_BITS_UP_TO_BYTES (BitLength);
            if (BitLength > AcpiGbl_IntegerBitWidth)
            {
                LocalType = ACPI_TYPE_BUFFER;
            }
        }
        break;

    default:

        /* Ignore all other types */

        return (AE_OK);
    }

    /* Emit the common prefix: Type:Name */

    AcpiOsPrintf ("%14s: %4.4s",
        AcpiUtGetTypeName (Node->Type), Node->Name.Ascii);
    if (!ObjDesc)
    {
        AcpiOsPrintf (" Ignoring, no attached object\n");
        return (AE_OK);
    }

    /*
     * Check for unsupported region types. Note: AcpiExec simulates
     * access to SystemMemory, SystemIO, PCI_Config, and EC.
     */
    switch (Node->Type)
    {
    case ACPI_TYPE_LOCAL_REGION_FIELD:

        RegionObj = ObjDesc->Field.RegionObj;
        switch (RegionObj->Region.SpaceId)
        {
        case ACPI_ADR_SPACE_SYSTEM_MEMORY:
        case ACPI_ADR_SPACE_SYSTEM_IO:
        case ACPI_ADR_SPACE_PCI_CONFIG:
        case ACPI_ADR_SPACE_EC:

            break;

        default:

            AcpiOsPrintf ("      %s space is not supported [%4.4s]\n",
                AcpiUtGetRegionName (RegionObj->Region.SpaceId),
                RegionObj->Region.Node->Name.Ascii);
            return (AE_OK);
        }
        break;

    default:
        break;
    }

    /* At this point, we have resolved the object to one of the major types */

    switch (LocalType)
    {
    case ACPI_TYPE_INTEGER:

        Status = AcpiDbTestIntegerType (Node, BitLength);
        break;

    case ACPI_TYPE_STRING:

        Status = AcpiDbTestStringType (Node, ByteLength);
        break;

    case ACPI_TYPE_BUFFER:

        Status = AcpiDbTestBufferType (Node, BitLength);
        break;

    default:

        AcpiOsPrintf (" Ignoring, type not implemented (%2.2X)",
            LocalType);
        break;
    }

    switch (Node->Type)
    {
    case ACPI_TYPE_LOCAL_REGION_FIELD:

        RegionObj = ObjDesc->Field.RegionObj;
        AcpiOsPrintf (" (%s)",
            AcpiUtGetRegionName (RegionObj->Region.SpaceId));
        break;

    default:
        break;
    }

    AcpiOsPrintf ("\n");
    return (Status);
}

ACPI_STATUS
AcpiEvAddressSpaceDispatch (
    ACPI_OPERAND_OBJECT     *RegionObj,
    UINT32                  Function,
    UINT32                  RegionOffset,
    UINT32                  BitWidth,
    UINT64                  *Value)
{
    ACPI_STATUS             Status;
    ACPI_ADR_SPACE_HANDLER  Handler;
    ACPI_ADR_SPACE_SETUP    RegionSetup;
    ACPI_OPERAND_OBJECT     *HandlerDesc;
    ACPI_OPERAND_OBJECT     *RegionObj2;
    void                    *RegionContext = NULL;


    ACPI_FUNCTION_TRACE (EvAddressSpaceDispatch);


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

    /* Ensure that there is a handler associated with this region */

    HandlerDesc = RegionObj->Region.Handler;
    if (!HandlerDesc)
    {
        ACPI_ERROR ((AE_INFO,
            "No handler for Region [%4.4s] (%p) [%s]",
            AcpiUtGetNodeName (RegionObj->Region.Node),
            RegionObj, AcpiUtGetRegionName (RegionObj->Region.SpaceId)));

        return_ACPI_STATUS (AE_NOT_EXIST);
    }

    /*
     * It may be the case that the region has never been initialized.
     * Some types of regions require special init code
     */
    if (!(RegionObj->Region.Flags & AOPOBJ_SETUP_COMPLETE))
    {
        /* This region has not been initialized yet, do it */

        RegionSetup = HandlerDesc->AddressSpace.Setup;
        if (!RegionSetup)
        {
            /* No initialization routine, exit with error */

            ACPI_ERROR ((AE_INFO,
                "No init routine for region(%p) [%s]",
                RegionObj, AcpiUtGetRegionName (RegionObj->Region.SpaceId)));
            return_ACPI_STATUS (AE_NOT_EXIST);
        }

        /*
         * We must exit the interpreter because the region setup will
         * potentially execute control methods (for example, the _REG method
         * for this region)
         */
        AcpiExExitInterpreter ();

        Status = RegionSetup (RegionObj, ACPI_REGION_ACTIVATE,
                    HandlerDesc->AddressSpace.Context, &RegionContext);

        /* Re-enter the interpreter */

        AcpiExEnterInterpreter ();

        /* Check for failure of the Region Setup */

        if (ACPI_FAILURE (Status))
        {
            ACPI_EXCEPTION ((AE_INFO, Status,
                "During region initialization: [%s]",
                AcpiUtGetRegionName (RegionObj->Region.SpaceId)));
            return_ACPI_STATUS (Status);
        }

        /* Region initialization may have been completed by RegionSetup */

        if (!(RegionObj->Region.Flags & AOPOBJ_SETUP_COMPLETE))
        {
            RegionObj->Region.Flags |= AOPOBJ_SETUP_COMPLETE;

            if (RegionObj2->Extra.RegionContext)
            {
                /* The handler for this region was already installed */

                ACPI_FREE (RegionContext);
            }
            else
            {
                /*
                 * Save the returned context for use in all accesses to
                 * this particular region
                 */
                RegionObj2->Extra.RegionContext = RegionContext;
//.........这里部分代码省略.........

ACPI_STATUS
AcpiHwWrite (
    UINT64                  Value,
    ACPI_GENERIC_ADDRESS    *Reg)
{
    UINT64                  Address;
    UINT8                   AccessWidth;
    UINT32                  BitWidth;
    UINT8                   BitOffset;
    UINT64                  Value64;
    UINT8                   Index;
    ACPI_STATUS             Status;


    ACPI_FUNCTION_NAME (HwWrite);


    /* Validate contents of the GAS register */

    Status = AcpiHwValidateRegister (Reg, 64, &Address);
    if (ACPI_FAILURE (Status))
    {
        return (Status);
    }

    /* Convert AccessWidth into number of bits based */

    AccessWidth = AcpiHwGetAccessBitWidth (Address, Reg, 64);
    BitWidth = Reg->BitOffset + Reg->BitWidth;
    BitOffset = Reg->BitOffset;

    /*
     * Two address spaces supported: Memory or IO. PCI_Config is
     * not supported here because the GAS structure is insufficient
     */
    Index = 0;
    while (BitWidth)
    {
        /*
         * Use offset style bit reads because "Index * AccessWidth" is
         * ensured to be less than 64-bits by AcpiHwValidateRegister().
         */
        Value64 = ACPI_GET_BITS (&Value, Index * AccessWidth,
            ACPI_MASK_BITS_ABOVE_64 (AccessWidth));

        if (BitOffset >= AccessWidth)
        {
            BitOffset -= AccessWidth;
        }
        else
        {
            if (Reg->SpaceId == ACPI_ADR_SPACE_SYSTEM_MEMORY)
            {
                Status = AcpiOsWriteMemory ((ACPI_PHYSICAL_ADDRESS)
                    Address + Index * ACPI_DIV_8 (AccessWidth),
                    Value64, AccessWidth);
            }
            else /* ACPI_ADR_SPACE_SYSTEM_IO, validated earlier */
            {
                Status = AcpiHwWritePort ((ACPI_IO_ADDRESS)
                    Address + Index * ACPI_DIV_8 (AccessWidth),
                    (UINT32) Value64, AccessWidth);
            }
        }

        /*
         * Index * AccessWidth is ensured to be less than 32-bits by
         * AcpiHwValidateRegister().
         */
        BitWidth -= BitWidth > AccessWidth ? AccessWidth : BitWidth;
        Index++;
    }

    ACPI_DEBUG_PRINT ((ACPI_DB_IO,
        "Wrote: %8.8X%8.8X width %2d   to %8.8X%8.8X (%s)\n",
        ACPI_FORMAT_UINT64 (Value), AccessWidth,
        ACPI_FORMAT_UINT64 (Address), AcpiUtGetRegionName (Reg->SpaceId)));

    return (Status);
}

ACPI_STATUS
AcpiExAccessRegion (
    ACPI_OPERAND_OBJECT     *ObjDesc,
    UINT32                  FieldDatumByteOffset,
    UINT64                  *Value,
    UINT32                  Function)
{
    ACPI_STATUS             Status;
    ACPI_OPERAND_OBJECT     *RgnDesc;
    UINT32                  RegionOffset;


    ACPI_FUNCTION_TRACE (ExAccessRegion);


    /*
     * Ensure that the region operands are fully evaluated and verify
     * the validity of the request
     */
    Status = AcpiExSetupRegion (ObjDesc, FieldDatumByteOffset);
    if (ACPI_FAILURE (Status))
    {
        return_ACPI_STATUS (Status);
    }

    /*
     * The physical address of this field datum is:
     *
     * 1) The base of the region, plus
     * 2) The base offset of the field, plus
     * 3) The current offset into the field
     */
    RgnDesc = ObjDesc->CommonField.RegionObj;
    RegionOffset =
        ObjDesc->CommonField.BaseByteOffset +
        FieldDatumByteOffset;

    if ((Function & ACPI_IO_MASK) == ACPI_READ)
    {
        ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD, "[READ]"));
    }
    else
    {
        ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD, "[WRITE]"));
    }

    ACPI_DEBUG_PRINT_RAW ((ACPI_DB_BFIELD,
        " Region [%s:%X], Width %X, ByteBase %X, Offset %X at %8.8X%8.8X\n",
        AcpiUtGetRegionName (RgnDesc->Region.SpaceId),
        RgnDesc->Region.SpaceId,
        ObjDesc->CommonField.AccessByteWidth,
        ObjDesc->CommonField.BaseByteOffset,
        FieldDatumByteOffset,
        ACPI_FORMAT_UINT64 (RgnDesc->Region.Address + RegionOffset)));

    /* Invoke the appropriate AddressSpace/OpRegion handler */

    Status = AcpiEvAddressSpaceDispatch (RgnDesc, ObjDesc,
                Function, RegionOffset,
                ACPI_MUL_8 (ObjDesc->CommonField.AccessByteWidth), Value);

    if (ACPI_FAILURE (Status))
    {
        if (Status == AE_NOT_IMPLEMENTED)
        {
            ACPI_ERROR ((AE_INFO,
                "Region %s (ID=%u) not implemented",
                AcpiUtGetRegionName (RgnDesc->Region.SpaceId),
                RgnDesc->Region.SpaceId));
        }
        else if (Status == AE_NOT_EXIST)
        {
            ACPI_ERROR ((AE_INFO,
                "Region %s (ID=%u) has no handler",
                AcpiUtGetRegionName (RgnDesc->Region.SpaceId),
                RgnDesc->Region.SpaceId));
        }
    }

    return_ACPI_STATUS (Status);
}

ACPI_STATUS
AcpiEvAddressSpaceDispatch (
    ACPI_OPERAND_OBJECT     *RegionObj,
    ACPI_OPERAND_OBJECT     *FieldObj,
    UINT32                  Function,
    UINT32                  RegionOffset,
    UINT32                  BitWidth,
    UINT64                  *Value)
{
    ACPI_STATUS             Status;
    ACPI_ADR_SPACE_HANDLER  Handler;
    ACPI_ADR_SPACE_SETUP    RegionSetup;
    ACPI_OPERAND_OBJECT     *HandlerDesc;
    ACPI_OPERAND_OBJECT     *RegionObj2;
    void                    *RegionContext = NULL;
    ACPI_CONNECTION_INFO    *Context;
    ACPI_PHYSICAL_ADDRESS   Address;


    ACPI_FUNCTION_TRACE (EvAddressSpaceDispatch);


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

    /* Ensure that there is a handler associated with this region */

    HandlerDesc = RegionObj->Region.Handler;
    if (!HandlerDesc)
    {
        ACPI_ERROR ((AE_INFO,
            "No handler for Region [%4.4s] (%p) [%s]",
            AcpiUtGetNodeName (RegionObj->Region.Node),
            RegionObj, AcpiUtGetRegionName (RegionObj->Region.SpaceId)));

        return_ACPI_STATUS (AE_NOT_EXIST);
    }

    Context = HandlerDesc->AddressSpace.Context;

    /*
     * It may be the case that the region has never been initialized.
     * Some types of regions require special init code
     */
    if (!(RegionObj->Region.Flags & AOPOBJ_SETUP_COMPLETE))
    {
        /* This region has not been initialized yet, do it */

        RegionSetup = HandlerDesc->AddressSpace.Setup;
        if (!RegionSetup)
        {
            /* No initialization routine, exit with error */

            ACPI_ERROR ((AE_INFO,
                "No init routine for region(%p) [%s]",
                RegionObj, AcpiUtGetRegionName (RegionObj->Region.SpaceId)));
            return_ACPI_STATUS (AE_NOT_EXIST);
        }

        /*
         * We must exit the interpreter because the region setup will
         * potentially execute control methods (for example, the _REG method
         * for this region)
         */
        AcpiExExitInterpreter ();

        Status = RegionSetup (RegionObj, ACPI_REGION_ACTIVATE,
                    Context, &RegionContext);

        /* Re-enter the interpreter */

        AcpiExEnterInterpreter ();

        /* Check for failure of the Region Setup */

        if (ACPI_FAILURE (Status))
        {
            ACPI_EXCEPTION ((AE_INFO, Status,
                "During region initialization: [%s]",
                AcpiUtGetRegionName (RegionObj->Region.SpaceId)));
            return_ACPI_STATUS (Status);
        }

        /* Region initialization may have been completed by RegionSetup */

        if (!(RegionObj->Region.Flags & AOPOBJ_SETUP_COMPLETE))
        {
            RegionObj->Region.Flags |= AOPOBJ_SETUP_COMPLETE;

            /*
             * Save the returned context for use in all accesses to
             * the handler for this particular region
             */
            if (!(RegionObj2->Extra.RegionContext))
            {
                RegionObj2->Extra.RegionContext = RegionContext;
            }
//.........这里部分代码省略.........

//.........这里部分代码省略.........
            /*
             * Move through the linked list of handlers
             */
            HandlerObj = HandlerObj->AddrHandler.Next;
        }
    }
    else
    {
        ACPI_DEBUG_PRINT ((ACPI_DB_OPREGION,
            "Creating object on Device %p while installing handler\n", Node));

        /* ObjDesc does not exist, create one */

        if (Node->Type == ACPI_TYPE_ANY)
        {
            Type = ACPI_TYPE_DEVICE;
        }
        else
        {
            Type = Node->Type;
        }

        ObjDesc = AcpiUtCreateInternalObject (Type);
        if (!ObjDesc)
        {
            Status = AE_NO_MEMORY;
            goto UnlockAndExit;
        }

        /* Init new descriptor */

        ObjDesc->Common.Type = (UINT8) Type;

        /* Attach the new object to the Node */

        Status = AcpiNsAttachObject (Node, ObjDesc, Type);
        if (ACPI_FAILURE (Status))
        {
            AcpiUtRemoveReference (ObjDesc);
            goto UnlockAndExit;
        }
    }

    ACPI_DEBUG_PRINT ((ACPI_DB_OPREGION,
        "Installing address handler for region %s(%X) on Device %4.4s %p(%p)\n",
        AcpiUtGetRegionName (SpaceId), SpaceId, Node->Name.Ascii, Node, ObjDesc));

    /*
     * Now we can install the handler
     *
     * At this point we know that there is no existing handler.
     * So, we just allocate the object for the handler and link it
     * into the list.
     */
    HandlerObj = AcpiUtCreateInternalObject (ACPI_TYPE_LOCAL_ADDRESS_HANDLER);
    if (!HandlerObj)
    {
        Status = AE_NO_MEMORY;
        goto UnlockAndExit;
    }

    HandlerObj->AddrHandler.SpaceId     = (UINT8) SpaceId;
    HandlerObj->AddrHandler.Hflags      = Flags;
    HandlerObj->AddrHandler.Next        = ObjDesc->Device.AddrHandler;
    HandlerObj->AddrHandler.RegionList  = NULL;
    HandlerObj->AddrHandler.Node        = Node;
    HandlerObj->AddrHandler.Handler     = Handler;
    HandlerObj->AddrHandler.Context     = Context;
    HandlerObj->AddrHandler.Setup       = Setup;

    /*
     * Now walk the namespace finding all of the regions this
     * handler will manage.
     *
     * We start at the device and search the branch toward
     * the leaf nodes until either the leaf is encountered or
     * a device is detected that has an address handler of the
     * same type.
     *
     * In either case we back up and search down the remainder
     * of the branch
     */
    Status = AcpiNsWalkNamespace (ACPI_TYPE_ANY, Device,
                                  ACPI_UINT32_MAX, ACPI_NS_WALK_UNLOCK,
                                  AcpiEvAddrHandlerHelper,
                                  HandlerObj, NULL);

    /*
     * Place this handler 1st on the list
     */
    HandlerObj->Common.ReferenceCount =
                            (UINT16) (HandlerObj->Common.ReferenceCount +
                            ObjDesc->Common.ReferenceCount - 1);
    ObjDesc->Device.AddrHandler = HandlerObj;


UnlockAndExit:
    (void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE);
    return_ACPI_STATUS (Status);
}

static ACPI_STATUS
AcpiEvInstallHandler (
    ACPI_HANDLE             ObjHandle,
    UINT32                  Level,
    void                    *Context,
    void                    **ReturnValue)
{
    ACPI_OPERAND_OBJECT     *HandlerObj;
    ACPI_OPERAND_OBJECT     *NextHandlerObj;
    ACPI_OPERAND_OBJECT     *ObjDesc;
    ACPI_NAMESPACE_NODE     *Node;
    ACPI_STATUS             Status;


    ACPI_FUNCTION_NAME (EvInstallHandler);


    HandlerObj = (ACPI_OPERAND_OBJECT  *) Context;

    /* Parameter validation */

    if (!HandlerObj)
    {
        return (AE_OK);
    }

    /* Convert and validate the device handle */

    Node = AcpiNsValidateHandle (ObjHandle);
    if (!Node)
    {
        return (AE_BAD_PARAMETER);
    }

    /*
     * We only care about regions and objects that are allowed to have
     * address space handlers
     */
    if ((Node->Type != ACPI_TYPE_DEVICE) &&
            (Node->Type != ACPI_TYPE_REGION) &&
            (Node != AcpiGbl_RootNode))
    {
        return (AE_OK);
    }

    /* Check for an existing internal object */

    ObjDesc = AcpiNsGetAttachedObject (Node);
    if (!ObjDesc)
    {
        /* No object, just exit */

        return (AE_OK);
    }

    /* Devices are handled different than regions */

    if (ObjDesc->Common.Type == ACPI_TYPE_DEVICE)
    {
        /* Check if this Device already has a handler for this address space */

        NextHandlerObj = AcpiEvFindRegionHandler (
                             HandlerObj->AddressSpace.SpaceId, ObjDesc->CommonNotify.Handler);
        if (NextHandlerObj)
        {
            /* Found a handler, is it for the same address space? */

            ACPI_DEBUG_PRINT ((ACPI_DB_OPREGION,
                               "Found handler for region [%s] in device %p(%p) handler %p\n",
                               AcpiUtGetRegionName (HandlerObj->AddressSpace.SpaceId),
                               ObjDesc, NextHandlerObj, HandlerObj));

            /*
             * Since the object we found it on was a device, then it means
             * that someone has already installed a handler for the branch
             * of the namespace from this device on. Just bail out telling
             * the walk routine to not traverse this branch. This preserves
             * the scoping rule for handlers.
             */
            return (AE_CTRL_DEPTH);
        }

        /*
         * As long as the device didn't have a handler for this space we
         * don't care about it. We just ignore it and proceed.
         */
        return (AE_OK);
    }

    /* Object is a Region */

    if (ObjDesc->Region.SpaceId != HandlerObj->AddressSpace.SpaceId)
    {
        /* This region is for a different address space, just ignore it */

        return (AE_OK);
    }

    /*
     * Now we have a region and it is for the handler's address space type.
//.........这里部分代码省略.........

ACPI_STATUS
AcpiHwRead (
    UINT32                  *Value,
    ACPI_GENERIC_ADDRESS    *Reg)
{
    UINT64                  Address;
    UINT8                   AccessWidth;
    UINT32                  BitWidth;
    UINT8                   BitOffset;
    UINT64                  Value64;
    UINT32                  Value32;
    UINT8                   Index;
    ACPI_STATUS             Status;


    ACPI_FUNCTION_NAME (HwRead);


    /* Validate contents of the GAS register */

    Status = AcpiHwValidateRegister (Reg, 32, &Address);
    if (ACPI_FAILURE (Status))
    {
        return (Status);
    }

    /*
     * Initialize entire 32-bit return value to zero, convert AccessWidth
     * into number of bits based
     */
    *Value = 0;
    AccessWidth = Reg->AccessWidth ? Reg->AccessWidth : 1;
    AccessWidth = 1 << (AccessWidth + 2);
    BitWidth = ACPI_ROUND_UP (Reg->BitOffset + Reg->BitWidth, AccessWidth);
    BitOffset = Reg->BitOffset;

    /*
     * Two address spaces supported: Memory or IO. PCI_Config is
     * not supported here because the GAS structure is insufficient
     */
    Index = 0;
    while (BitWidth)
    {
        if (BitOffset > AccessWidth)
        {
            Value32 = 0;
            BitOffset -= AccessWidth;
        }
        else
        {
            if (Reg->SpaceId == ACPI_ADR_SPACE_SYSTEM_MEMORY)
            {
                Status = AcpiOsReadMemory ((ACPI_PHYSICAL_ADDRESS)
                    Address + Index * ACPI_DIV_8 (AccessWidth),
                    &Value64, AccessWidth);
                Value32 = (UINT32) Value64;
            }
            else /* ACPI_ADR_SPACE_SYSTEM_IO, validated earlier */
            {
                Status = AcpiHwReadPort ((ACPI_IO_ADDRESS)
                    Address + Index * ACPI_DIV_8 (AccessWidth),
                    &Value32, AccessWidth);
            }

            if (BitOffset)
            {
                Value32 &= ACPI_MASK_BITS_BELOW (BitOffset);
                BitOffset = 0;
            }
            if (BitWidth < AccessWidth)
            {
                Value32 &= ACPI_MASK_BITS_ABOVE (BitWidth);
            }
        }

        ACPI_SET_BITS (Value, Index * AccessWidth,
            ((1 << AccessWidth) - 1), Value32);

        BitWidth -= BitWidth > AccessWidth ? AccessWidth : BitWidth;
        Index++;
    }

    ACPI_DEBUG_PRINT ((ACPI_DB_IO,
        "Read:  %8.8X width %2d from %8.8X%8.8X (%s)\n",
        *Value, AccessWidth, ACPI_FORMAT_UINT64 (Address),
        AcpiUtGetRegionName (Reg->SpaceId)));

    return (Status);
}

//.........这里部分代码省略.........
     * Two address spaces supported: Memory or IO. PCI_Config is
     * not supported here because the GAS structure is insufficient
     */
    Index = 0;
    while (BitWidth)
    {
        NewValue32 = ACPI_GET_BITS (&Value, (Index * AccessWidth),
            ((1 << AccessWidth) - 1));

        if (BitOffset > AccessWidth)
        {
            BitOffset -= AccessWidth;
        }
        else
        {
            if (BitOffset)
            {
                NewValue32 &= ACPI_MASK_BITS_BELOW (BitOffset);
            }

            if (BitWidth < AccessWidth)
            {
                NewValue32 &= ACPI_MASK_BITS_ABOVE (BitWidth);
            }

            if (Reg->SpaceId == ACPI_ADR_SPACE_SYSTEM_MEMORY)
            {
                if (BitOffset || BitWidth < AccessWidth)
                {
                    /*
                     * Read old values in order not to modify the bits that
                     * are beyond the register BitWidth/BitOffset setting.
                     */
                    Status = AcpiOsReadMemory ((ACPI_PHYSICAL_ADDRESS)
                        Address + Index * ACPI_DIV_8 (AccessWidth),
                        &Value64, AccessWidth);
                    OldValue32 = (UINT32) Value64;

                    if (BitOffset)
                    {
                        OldValue32 &= ACPI_MASK_BITS_ABOVE (BitOffset + 1);
                        BitOffset = 0;
                    }

                    if (BitWidth < AccessWidth)
                    {
                        OldValue32 &= ACPI_MASK_BITS_BELOW (BitWidth - 1);
                    }

                    NewValue32 |= OldValue32;
                }

                Value64 = (UINT64) NewValue32;
                Status = AcpiOsWriteMemory ((ACPI_PHYSICAL_ADDRESS)
                    Address + Index * ACPI_DIV_8 (AccessWidth),
                    Value64, AccessWidth);
            }
            else /* ACPI_ADR_SPACE_SYSTEM_IO, validated earlier */
            {
                if (BitOffset || BitWidth < AccessWidth)
                {
                    /*
                     * Read old values in order not to modify the bits that
                     * are beyond the register BitWidth/BitOffset setting.
                     */
                    Status = AcpiHwReadPort ((ACPI_IO_ADDRESS)
                        Address + Index * ACPI_DIV_8 (AccessWidth),
                        &OldValue32, AccessWidth);

                    if (BitOffset)
                    {
                        OldValue32 &= ACPI_MASK_BITS_ABOVE (BitOffset + 1);
                        BitOffset = 0;
                    }

                    if (BitWidth < AccessWidth)
                    {
                        OldValue32 &= ACPI_MASK_BITS_BELOW (BitWidth - 1);
                    }

                    NewValue32 |= OldValue32;
                }

                Status = AcpiHwWritePort ((ACPI_IO_ADDRESS)
                    Address + Index * ACPI_DIV_8 (AccessWidth),
                    NewValue32, AccessWidth);
            }
        }

        BitWidth -= BitWidth > AccessWidth ? AccessWidth : BitWidth;
        Index++;
    }

    ACPI_DEBUG_PRINT ((ACPI_DB_IO,
        "Wrote: %8.8X width %2d   to %8.8X%8.8X (%s)\n",
        Value, AccessWidth, ACPI_FORMAT_UINT64 (Address),
        AcpiUtGetRegionName (Reg->SpaceId)));

    return (Status);
}

ACPI_STATUS
AcpiEvAddrHandlerHelper (
    ACPI_HANDLE             ObjHandle,
    UINT32                  Level,
    void                    *Context,
    void                    **ReturnValue)
{
    ACPI_OPERAND_OBJECT     *HandlerObj;
    ACPI_OPERAND_OBJECT     *TmpObj;
    ACPI_OPERAND_OBJECT     *ObjDesc;
    ACPI_NAMESPACE_NODE     *Node;
    ACPI_STATUS             Status;


    ACPI_FUNCTION_NAME ("EvAddrHandlerHelper");


    HandlerObj = (ACPI_OPERAND_OBJECT  *) Context;

    /* Parameter validation */

    if (!HandlerObj)
    {
        return (AE_OK);
    }

    /* Convert and validate the device handle */

    Node = AcpiNsMapHandleToNode (ObjHandle);
    if (!Node)
    {
        return (AE_BAD_PARAMETER);
    }

    /*
     *  We only care about regions.and objects
     *  that can have address handlers
     */
    if ((Node->Type != ACPI_TYPE_DEVICE) &&
        (Node->Type != ACPI_TYPE_REGION) &&
        (Node != AcpiGbl_RootNode))
    {
        return (AE_OK);
    }

    /* Check for an existing internal object */

    ObjDesc = AcpiNsGetAttachedObject (Node);
    if (!ObjDesc)
    {
        /*
         *  The object DNE, we don't care about it
         */
        return (AE_OK);
    }

    /*
     *  Devices are handled different than regions
     */
    if (ACPI_GET_OBJECT_TYPE (ObjDesc) == ACPI_TYPE_DEVICE)
    {
        /*
         *  See if this guy has any handlers
         */
        TmpObj = ObjDesc->Device.AddrHandler;
        while (TmpObj)
        {
            /*
             *  Now let's see if it's for the same address space.
             */
            if (TmpObj->AddrHandler.SpaceId == HandlerObj->AddrHandler.SpaceId)
            {
                /*
                 *  It's for the same address space
                 */
                ACPI_DEBUG_PRINT ((ACPI_DB_OPREGION,
                    "Found handler for region [%s] in device %p(%p) handler %p\n",
                    AcpiUtGetRegionName (HandlerObj->AddrHandler.SpaceId),
                    ObjDesc, TmpObj, HandlerObj));

                /*
                 *  Since the object we found it on was a device, then it
                 *  means that someone has already installed a handler for
                 *  the branch of the namespace from this device on.  Just
                 *  bail out telling the walk routine to not traverse this
                 *  branch.  This preserves the scoping rule for handlers.
                 */
                return (AE_CTRL_DEPTH);
            }

            /*
             *  Move through the linked list of handlers
             */
            TmpObj = TmpObj->AddrHandler.Next;
        }

        /*
         *  As long as the device didn't have a handler for this
         *  space we don't care about it.  We just ignore it and
         *  proceed.
//.........这里部分代码省略.........

void
AcpiEvDetachRegion(
    ACPI_OPERAND_OBJECT     *RegionObj,
    BOOLEAN                 AcpiNsIsLocked)
{
    ACPI_OPERAND_OBJECT     *HandlerObj;
    ACPI_OPERAND_OBJECT     *ObjDesc;
    ACPI_OPERAND_OBJECT     **LastObjPtr;
    ACPI_ADR_SPACE_SETUP    RegionSetup;
    void                    *RegionContext;
    ACPI_OPERAND_OBJECT     *RegionObj2;
    ACPI_STATUS             Status;


    ACPI_FUNCTION_TRACE ("EvDetachRegion");


    RegionObj2 = AcpiNsGetSecondaryObject (RegionObj);
    if (!RegionObj2)
    {
        return_VOID;
    }
    RegionContext = RegionObj2->Extra.RegionContext;

    /*
     *  Get the address handler from the region object
     */
    HandlerObj = RegionObj->Region.AddrHandler;
    if (!HandlerObj)
    {
        /*
         *  This region has no handler, all done
         */
        return_VOID;
    }


    /*
     *  Find this region in the handler's list
     */
    ObjDesc = HandlerObj->AddrHandler.RegionList;
    LastObjPtr = &HandlerObj->AddrHandler.RegionList;

    while (ObjDesc)
    {
        /*
         *  See if this is the one
         */
        if (ObjDesc == RegionObj)
        {
            ACPI_DEBUG_PRINT ((ACPI_DB_OPREGION,
                "Removing Region %p from address handler %p\n",
                RegionObj, HandlerObj));
            /*
             *  This is it, remove it from the handler's list
             */
            *LastObjPtr = ObjDesc->Region.Next;
            ObjDesc->Region.Next = NULL;            /* Must clear field */

            if (AcpiNsIsLocked)
            {
                Status = AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE);
                if (ACPI_FAILURE (Status))
                {
                    return_VOID;
                }
            }

            /*
             *  Now stop region accesses by executing the _REG method
             */
            Status = AcpiEvExecuteRegMethod (RegionObj, 0);
            if (ACPI_FAILURE (Status))
            {
                ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "%s from region _REG, [%s]\n",
                    AcpiFormatException (Status),
                    AcpiUtGetRegionName (RegionObj->Region.SpaceId)));
            }

            if (AcpiNsIsLocked)
            {
                Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE);
                if (ACPI_FAILURE (Status))
                {
                    return_VOID;
                }
            }

            /*
             *  Call the setup handler with the deactivate notification
             */
            RegionSetup = HandlerObj->AddrHandler.Setup;
            Status = RegionSetup (RegionObj, ACPI_REGION_DEACTIVATE,
                            HandlerObj->AddrHandler.Context, &RegionContext);

            /*
             *  Init routine may fail, Just ignore errors
             */
            if (ACPI_FAILURE (Status))
            {
//.........这里部分代码省略.........

ACPI_STATUS
AcpiEvAddressSpaceDispatch (
    ACPI_OPERAND_OBJECT     *RegionObj,
    UINT32                  Function,
    ACPI_PHYSICAL_ADDRESS   Address,
    UINT32                  BitWidth,
    void                    *Value)
{
    ACPI_STATUS             Status;
    ACPI_STATUS             Status2;
    ACPI_ADR_SPACE_HANDLER  Handler;
    ACPI_ADR_SPACE_SETUP    RegionSetup;
    ACPI_OPERAND_OBJECT     *HandlerDesc;
    ACPI_OPERAND_OBJECT     *RegionObj2;
    void                    *RegionContext = NULL;


    ACPI_FUNCTION_TRACE ("EvAddressSpaceDispatch");


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

    /*
     * Ensure that there is a handler associated with this region
     */
    HandlerDesc = RegionObj->Region.AddrHandler;
    if (!HandlerDesc)
    {
        ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "no handler for region(%p) [%s]\n",
            RegionObj, AcpiUtGetRegionName (RegionObj->Region.SpaceId)));

        return_ACPI_STATUS (AE_NOT_EXIST);
    }

    /*
     * It may be the case that the region has never been initialized
     * Some types of regions require special init code
     */
    if (!(RegionObj->Region.Flags & AOPOBJ_SETUP_COMPLETE))
    {
        /*
         * This region has not been initialized yet, do it
         */
        RegionSetup = HandlerDesc->AddrHandler.Setup;
        if (!RegionSetup)
        {
            /*
             *  Bad news, no init routine and not init'd
             */
            ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "No init routine for region(%p) [%s]\n",
                RegionObj, AcpiUtGetRegionName (RegionObj->Region.SpaceId)));
            return_ACPI_STATUS (AE_UNKNOWN_STATUS);
        }

        /*
         * We must exit the interpreter because the region setup will potentially
         * execute control methods
         */
        AcpiExExitInterpreter ();

        Status = RegionSetup (RegionObj, ACPI_REGION_ACTIVATE,
                        HandlerDesc->AddrHandler.Context, &RegionContext);

        /* Re-enter the interpreter */

        Status2 = AcpiExEnterInterpreter ();
        if (ACPI_FAILURE (Status2))
        {
            return_ACPI_STATUS (Status2);
        }

        /*
         *  Init routine may fail
         */
        if (ACPI_FAILURE (Status))
        {
            ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Region Init: %s [%s]\n",
                AcpiFormatException (Status),
                AcpiUtGetRegionName (RegionObj->Region.SpaceId)));
            return_ACPI_STATUS (Status);
        }

        RegionObj->Region.Flags |= AOPOBJ_SETUP_COMPLETE;

        /*
         *  Save the returned context for use in all accesses to
         *  this particular region.
         */
        RegionObj2->Extra.RegionContext = RegionContext;
    }

    /*
     *  We have everything we need, begin the process
     */
    Handler = HandlerDesc->AddrHandler.Handler;

//.........这里部分代码省略.........

//.........这里部分代码省略.........
        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);
}

ACPI_STATUS
AcpiRemoveAddressSpaceHandler (
    ACPI_HANDLE             Device,
    ACPI_ADR_SPACE_TYPE     SpaceId,
    ACPI_ADR_SPACE_HANDLER  Handler)
{
    ACPI_OPERAND_OBJECT     *ObjDesc;
    ACPI_OPERAND_OBJECT     *HandlerObj;
    ACPI_OPERAND_OBJECT     *RegionObj;
    ACPI_OPERAND_OBJECT     **LastObjPtr;
    ACPI_NAMESPACE_NODE     *Node;
    ACPI_STATUS             Status;


    ACPI_FUNCTION_TRACE ("AcpiRemoveAddressSpaceHandler");


    /* Parameter validation */

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

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

    /* Convert and validate the device handle */

    Node = AcpiNsMapHandleToNode (Device);
    if (!Node)
    {
        Status = AE_BAD_PARAMETER;
        goto UnlockAndExit;
    }

    /* Make sure the internal object exists */

    ObjDesc = AcpiNsGetAttachedObject (Node);
    if (!ObjDesc)
    {
        Status = AE_NOT_EXIST;
        goto UnlockAndExit;
    }

    /*
     * find the address handler the user requested
     */
    HandlerObj = ObjDesc->Device.AddrHandler;
    LastObjPtr = &ObjDesc->Device.AddrHandler;
    while (HandlerObj)
    {
        /*
         * We have a handler, see if user requested this one