acpi_status
acpi_ev_gpe_initialize (void)
{
	u32                     i;
	u32                     j;
	u32                     register_index;
	u32                     gpe_number;
	u16                     gpe0register_count;
	u16                     gpe1_register_count;


	FUNCTION_TRACE ("Ev_gpe_initialize");

	/*
	 * Set up various GPE counts
	 *
	 * You may ask,why are the GPE register block lengths divided by 2?
	 * From the ACPI 2.0 Spec, section, 4.7.1.6 General-Purpose Event
	 * Registers, we have,
	 *
	 * "Each register block contains two registers of equal length
	 * GPEx_STS and GPEx_EN (where x is 0 or 1). The length of the
	 * GPE0_STS and GPE0_EN registers is equal to half the GPE0_LEN
	 * The length of the GPE1_STS and GPE1_EN registers is equal to
	 * half the GPE1_LEN. If a generic register block is not supported
	 * then its respective block pointer and block length values in the
	 * FADT table contain zeros. The GPE0_LEN and GPE1_LEN do not need
	 * to be the same size."
	 */
	gpe0register_count          = (u16) DIV_2 (acpi_gbl_FADT->gpe0blk_len);
	gpe1_register_count         = (u16) DIV_2 (acpi_gbl_FADT->gpe1_blk_len);
	acpi_gbl_gpe_register_count = gpe0register_count + gpe1_register_count;

	if (!acpi_gbl_gpe_register_count) {
		REPORT_WARNING (("Zero GPEs are defined in the FADT\n"));
		return_ACPI_STATUS (AE_OK);
	}

	/*
	 * Allocate the Gpe information block
	 */
	acpi_gbl_gpe_registers = ACPI_MEM_CALLOCATE (acpi_gbl_gpe_register_count *
			  sizeof (acpi_gpe_registers));
	if (!acpi_gbl_gpe_registers) {
		ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
			"Could not allocate the Gpe_registers block\n"));
		return_ACPI_STATUS (AE_NO_MEMORY);
	}

	/*
	 * Allocate the Gpe dispatch handler block
	 * There are eight distinct GP events per register.
	 * Initialization to zeros is sufficient
	 */
	acpi_gbl_gpe_info = ACPI_MEM_CALLOCATE (MUL_8 (acpi_gbl_gpe_register_count) *
			  sizeof (acpi_gpe_level_info));
	if (!acpi_gbl_gpe_info) {
		ACPI_MEM_FREE (acpi_gbl_gpe_registers);
		ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Could not allocate the Gpe_info block\n"));
		return_ACPI_STATUS (AE_NO_MEMORY);
	}

	/* Set the Gpe validation table to GPE_INVALID */

	MEMSET (acpi_gbl_gpe_valid, (int) ACPI_GPE_INVALID, ACPI_NUM_GPE);

	/*
	 * Initialize the Gpe information and validation blocks.  A goal of these
	 * blocks is to hide the fact that there are two separate GPE register sets
	 * In a given block, the status registers occupy the first half, and
	 * the enable registers occupy the second half.
	 */

	/* GPE Block 0 */

	register_index = 0;

	for (i = 0; i < gpe0register_count; i++) {
		acpi_gbl_gpe_registers[register_index].status_addr =
				 (u16) (ACPI_GET_ADDRESS (acpi_gbl_FADT->Xgpe0blk.address) + i);

		acpi_gbl_gpe_registers[register_index].enable_addr =
				 (u16) (ACPI_GET_ADDRESS (acpi_gbl_FADT->Xgpe0blk.address) + i + gpe0register_count);

		acpi_gbl_gpe_registers[register_index].gpe_base = (u8) MUL_8 (i);

		for (j = 0; j < 8; j++) {
			gpe_number = acpi_gbl_gpe_registers[register_index].gpe_base + j;
			acpi_gbl_gpe_valid[gpe_number] = (u8) register_index;
		}

		/*
		 * Clear the status/enable registers.  Note that status registers
		 * are cleared by writing a '1', while enable registers are cleared
		 * by writing a '0'.
		 */
		acpi_os_write_port (acpi_gbl_gpe_registers[register_index].enable_addr, 0x00, 8);
		acpi_os_write_port (acpi_gbl_gpe_registers[register_index].status_addr, 0xFF, 8);

		register_index++;
//.........这里部分代码省略.........

ACPI_STATUS
AcpiNsInitializeDevices (
    void)
{
    ACPI_STATUS             Status;
    ACPI_DEVICE_WALK_INFO   Info;


    ACPI_FUNCTION_TRACE (NsInitializeDevices);


    /* Init counters */

    Info.DeviceCount = 0;
    Info.Num_STA = 0;
    Info.Num_INI = 0;

    ACPI_DEBUG_PRINT_RAW ((ACPI_DB_INIT,
        "Initializing Device/Processor/Thermal objects "
        "and executing _INI/_STA methods:\n"));

    /* Tree analysis: find all subtrees that contain _INI methods */

    Status = AcpiNsWalkNamespace (ACPI_TYPE_ANY, ACPI_ROOT_OBJECT,
        ACPI_UINT32_MAX, FALSE, AcpiNsFindIniMethods, NULL, &Info, NULL);
    if (ACPI_FAILURE (Status))
    {
        goto ErrorExit;
    }

    /* Allocate the evaluation information block */

    Info.EvaluateInfo = ACPI_ALLOCATE_ZEROED (sizeof (ACPI_EVALUATE_INFO));
    if (!Info.EvaluateInfo)
    {
        Status = AE_NO_MEMORY;
        goto ErrorExit;
    }

    /*
     * Execute the "global" _INI method that may appear at the root. This
     * support is provided for Windows compatibility (Vista+) and is not
     * part of the ACPI specification.
     */
    Info.EvaluateInfo->PrefixNode = AcpiGbl_RootNode;
    Info.EvaluateInfo->RelativePathname = METHOD_NAME__INI;
    Info.EvaluateInfo->Parameters = NULL;
    Info.EvaluateInfo->Flags = ACPI_IGNORE_RETURN_VALUE;

    Status = AcpiNsEvaluate (Info.EvaluateInfo);
    if (ACPI_SUCCESS (Status))
    {
        Info.Num_INI++;
    }

    /* Walk namespace to execute all _INIs on present devices */

    Status = AcpiNsWalkNamespace (ACPI_TYPE_ANY, ACPI_ROOT_OBJECT,
        ACPI_UINT32_MAX, FALSE, AcpiNsInitOneDevice, NULL, &Info, NULL);

    /*
     * Any _OSI requests should be completed by now. If the BIOS has
     * requested any Windows OSI strings, we will always truncate
     * I/O addresses to 16 bits -- for Windows compatibility.
     */
    if (AcpiGbl_OsiData >= ACPI_OSI_WIN_2000)
    {
        AcpiGbl_TruncateIoAddresses = TRUE;
    }

    ACPI_FREE (Info.EvaluateInfo);
    if (ACPI_FAILURE (Status))
    {
        goto ErrorExit;
    }

    ACPI_DEBUG_PRINT_RAW ((ACPI_DB_INIT,
        "    Executed %u _INI methods requiring %u _STA executions "
        "(examined %u objects)\n",
        Info.Num_INI, Info.Num_STA, Info.DeviceCount));

    return_ACPI_STATUS (Status);


ErrorExit:
    ACPI_EXCEPTION ((AE_INFO, Status, "During device initialization"));
    return_ACPI_STATUS (Status);
}

/*******************************************************************************
 *
 * FUNCTION:    ns_one_complete_parse
 *
 * PARAMETERS:  pass_number             - 1 or 2
 *              table_desc              - The table to be parsed.
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Perform one complete parse of an ACPI/AML table.
 *
 ******************************************************************************/
acpi_status
acpi_ns_one_complete_parse(acpi_native_uint pass_number,
			   acpi_native_uint table_index)
{
	union acpi_parse_object *parse_root;
	acpi_status status;
	acpi_native_uint aml_length;
	u8 *aml_start;
	struct acpi_walk_state *walk_state;
	struct acpi_table_header *table;
	acpi_owner_id owner_id;

	ACPI_FUNCTION_TRACE(ns_one_complete_parse);

	status = acpi_tb_get_owner_id(table_index, &owner_id);
	if (ACPI_FAILURE(status)) {
		return_ACPI_STATUS(status);
	}

	/* Create and init a Root Node */

	parse_root = acpi_ps_create_scope_op();
	if (!parse_root) {
		return_ACPI_STATUS(AE_NO_MEMORY);
	}

	/* Create and initialize a new walk state */

	walk_state = acpi_ds_create_walk_state(owner_id, NULL, NULL, NULL);
	if (!walk_state) {
		acpi_ps_free_op(parse_root);
		return_ACPI_STATUS(AE_NO_MEMORY);
	}

	status = acpi_get_table_by_index(table_index, &table);
	if (ACPI_FAILURE(status)) {
		acpi_ds_delete_walk_state(walk_state);
		acpi_ps_free_op(parse_root);
		return_ACPI_STATUS(status);
	}

	/* Table must consist of at least a complete header */

	if (table->length < sizeof(struct acpi_table_header)) {
		status = AE_BAD_HEADER;
	} else {
		aml_start = (u8 *) table + sizeof(struct acpi_table_header);
		aml_length = table->length - sizeof(struct acpi_table_header);
		status = acpi_ds_init_aml_walk(walk_state, parse_root, NULL,
					       aml_start, aml_length, NULL,
					       (u8) pass_number);
	}

	if (ACPI_FAILURE(status)) {
		acpi_ds_delete_walk_state(walk_state);
		acpi_ps_delete_parse_tree(parse_root);
		return_ACPI_STATUS(status);
	}

	/* Parse the AML */

	ACPI_DEBUG_PRINT((ACPI_DB_PARSE, "*PARSE* pass %d parse\n",
			  (unsigned)pass_number));
	status = acpi_ps_parse_aml(walk_state);

	acpi_ps_delete_parse_tree(parse_root);
	return_ACPI_STATUS(status);
}

ACPI_STATUS
AcpiExReadDataFromField (
    ACPI_WALK_STATE         *WalkState,
    ACPI_OPERAND_OBJECT     *ObjDesc,
    ACPI_OPERAND_OBJECT     **RetBufferDesc)
{
    ACPI_STATUS             Status;
    ACPI_OPERAND_OBJECT     *BufferDesc;
    ACPI_SIZE               Length;
    void                    *Buffer;
    UINT32                  Function;
    UINT16                  AccessorType;


    ACPI_FUNCTION_TRACE_PTR (ExReadDataFromField, ObjDesc);


    /* Parameter validation */

    if (!ObjDesc)
    {
        return_ACPI_STATUS (AE_AML_NO_OPERAND);
    }
    if (!RetBufferDesc)
    {
        return_ACPI_STATUS (AE_BAD_PARAMETER);
    }

    if (ObjDesc->Common.Type == ACPI_TYPE_BUFFER_FIELD)
    {
        /*
         * If the BufferField arguments have not been previously evaluated,
         * evaluate them now and save the results.
         */
        if (!(ObjDesc->Common.Flags & AOPOBJ_DATA_VALID))
        {
            Status = AcpiDsGetBufferFieldArguments (ObjDesc);
            if (ACPI_FAILURE (Status))
            {
                return_ACPI_STATUS (Status);
            }
        }
    }
    else if ((ObjDesc->Common.Type == ACPI_TYPE_LOCAL_REGION_FIELD) &&
             (ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_SMBUS ||
              ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_GSBUS ||
              ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_IPMI))
    {
        /*
         * This is an SMBus, GSBus or IPMI read. We must create a buffer to hold
         * the data and then directly access the region handler.
         *
         * Note: SMBus and GSBus protocol value is passed in upper 16-bits of Function
         */
        if (ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_SMBUS)
        {
            Length = ACPI_SMBUS_BUFFER_SIZE;
            Function = ACPI_READ | (ObjDesc->Field.Attribute << 16);
        }
        else if (ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_GSBUS)
        {
            AccessorType = ObjDesc->Field.Attribute;
            Length = AcpiExGetSerialAccessLength (AccessorType,
                ObjDesc->Field.AccessLength);

	    /*
             * Add additional 2 bytes for modeled GenericSerialBus data buffer:
             * typedef struct {
             *     BYTEStatus; // Byte 0 of the data buffer
             *     BYTELength; // Byte 1 of the data buffer
             *     BYTE[x-1]Data; // Bytes 2-x of the arbitrary length data buffer,
             * }
	     */
            Length += 2;
            Function = ACPI_READ | (AccessorType << 16);
        }
        else /* IPMI */
        {
            Length = ACPI_IPMI_BUFFER_SIZE;
            Function = ACPI_READ;
        }

        BufferDesc = AcpiUtCreateBufferObject (Length);
        if (!BufferDesc)
        {
            return_ACPI_STATUS (AE_NO_MEMORY);
        }

        /* Lock entire transaction if requested */

        AcpiExAcquireGlobalLock (ObjDesc->CommonField.FieldFlags);

        /* Call the region handler for the read */

        Status = AcpiExAccessRegion (ObjDesc, 0,
                    ACPI_CAST_PTR (UINT64, BufferDesc->Buffer.Pointer),
                    Function);
        AcpiExReleaseGlobalLock (ObjDesc->CommonField.FieldFlags);
        goto Exit;
    }
//.........这里部分代码省略.........

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.........

ACPI_STATUS
AcpiInstallGpeHandler (
    ACPI_HANDLE             GpeDevice,
    UINT32                  GpeNumber,
    UINT32                  Type,
    ACPI_EVENT_HANDLER      Address,
    void                    *Context)
{
    ACPI_GPE_EVENT_INFO     *GpeEventInfo;
    ACPI_HANDLER_INFO       *Handler;
    ACPI_STATUS             Status;
    ACPI_CPU_FLAGS          Flags;


    ACPI_FUNCTION_TRACE (AcpiInstallGpeHandler);


    /* Parameter validation */

    if ((!Address) || (Type & ~ACPI_GPE_XRUPT_TYPE_MASK))
    {
        return_ACPI_STATUS (AE_BAD_PARAMETER);
    }

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

    /* Ensure that we have a valid GPE number */

    GpeEventInfo = AcpiEvGetGpeEventInfo (GpeDevice, GpeNumber);
    if (!GpeEventInfo)
    {
        Status = AE_BAD_PARAMETER;
        goto UnlockAndExit;
    }

    /* Make sure that there isn't a handler there already */

    if ((GpeEventInfo->Flags & ACPI_GPE_DISPATCH_MASK) ==
            ACPI_GPE_DISPATCH_HANDLER)
    {
        Status = AE_ALREADY_EXISTS;
        goto UnlockAndExit;
    }

    /* Allocate and init handler object */

    Handler = ACPI_ALLOCATE_ZEROED (sizeof (ACPI_HANDLER_INFO));
    if (!Handler)
    {
        Status = AE_NO_MEMORY;
        goto UnlockAndExit;
    }

    Handler->Address    = Address;
    Handler->Context    = Context;
    Handler->MethodNode = GpeEventInfo->Dispatch.MethodNode;

    /* Disable the GPE before installing the handler */

    Status = AcpiEvDisableGpe (GpeEventInfo);
    if (ACPI_FAILURE (Status))
    {
        goto UnlockAndExit;
    }

    /* Install the handler */

    Flags = AcpiOsAcquireLock (AcpiGbl_GpeLock);
    GpeEventInfo->Dispatch.Handler = Handler;

    /* Setup up dispatch flags to indicate handler (vs. method) */

    GpeEventInfo->Flags &= ~(ACPI_GPE_XRUPT_TYPE_MASK | ACPI_GPE_DISPATCH_MASK);
    GpeEventInfo->Flags |= (UINT8) (Type | ACPI_GPE_DISPATCH_HANDLER);

    AcpiOsReleaseLock (AcpiGbl_GpeLock, Flags);


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

acpi_status acpi_ps_execute_method(struct acpi_evaluate_info * info)
{
	acpi_status status;
	union acpi_parse_object *op;
	struct acpi_walk_state *walk_state;

	ACPI_FUNCTION_TRACE(ps_execute_method);

	/* Quick validation of DSDT header */

	acpi_tb_check_dsdt_header();

	/* Validate the Info and method Node */

	if (!info || !info->node) {
		return_ACPI_STATUS(AE_NULL_ENTRY);
	}

	/* Init for new method, wait on concurrency semaphore */

	status =
	    acpi_ds_begin_method_execution(info->node, info->obj_desc, NULL);
	if (ACPI_FAILURE(status)) {
		return_ACPI_STATUS(status);
	}

	/*
	 * The caller "owns" the parameters, so give each one an extra reference
	 */
	acpi_ps_update_parameter_list(info, REF_INCREMENT);

	/*
	 * Execute the method. Performs parse simultaneously
	 */
	ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
			  "**** Begin Method Parse/Execute [%4.4s] **** Node=%p Obj=%p\n",
			  info->node->name.ascii, info->node, info->obj_desc));

	/* Create and init a Root Node */

	op = acpi_ps_create_scope_op(info->obj_desc->method.aml_start);
	if (!op) {
		status = AE_NO_MEMORY;
		goto cleanup;
	}

	/* Create and initialize a new walk state */

	info->pass_number = ACPI_IMODE_EXECUTE;
	walk_state =
	    acpi_ds_create_walk_state(info->obj_desc->method.owner_id, NULL,
				      NULL, NULL);
	if (!walk_state) {
		status = AE_NO_MEMORY;
		goto cleanup;
	}

	status = acpi_ds_init_aml_walk(walk_state, op, info->node,
				       info->obj_desc->method.aml_start,
				       info->obj_desc->method.aml_length, info,
				       info->pass_number);
	if (ACPI_FAILURE(status)) {
		acpi_ds_delete_walk_state(walk_state);
		goto cleanup;
	}

	if (info->obj_desc->method.info_flags & ACPI_METHOD_MODULE_LEVEL) {
		walk_state->parse_flags |= ACPI_PARSE_MODULE_LEVEL;
	}

	/* Invoke an internal method if necessary */

	if (info->obj_desc->method.info_flags & ACPI_METHOD_INTERNAL_ONLY) {
		status =
		    info->obj_desc->method.dispatch.implementation(walk_state);
		info->return_object = walk_state->return_desc;

		/* Cleanup states */

		acpi_ds_scope_stack_clear(walk_state);
		acpi_ps_cleanup_scope(&walk_state->parser_state);
		acpi_ds_terminate_control_method(walk_state->method_desc,
						 walk_state);
		acpi_ds_delete_walk_state(walk_state);
		goto cleanup;
	}

	/*
	 * Start method evaluation with an implicit return of zero.
	 * This is done for Windows compatibility.
	 */
	if (acpi_gbl_enable_interpreter_slack) {
		walk_state->implicit_return_obj =
		    acpi_ut_create_integer_object((u64) 0);
		if (!walk_state->implicit_return_obj) {
			status = AE_NO_MEMORY;
			acpi_ds_delete_walk_state(walk_state);
			goto cleanup;
		}
	}
//.........这里部分代码省略.........

ACPI_STATUS
AcpiNsWalkNamespace (
    ACPI_OBJECT_TYPE        Type,
    ACPI_HANDLE             StartNode,
    UINT32                  MaxDepth,
    UINT32                  Flags,
    ACPI_WALK_CALLBACK      DescendingCallback,
    ACPI_WALK_CALLBACK      AscendingCallback,
    void                    *Context,
    void                    **ReturnValue)
{
    ACPI_STATUS             Status;
    ACPI_STATUS             MutexStatus;
    ACPI_NAMESPACE_NODE     *ChildNode;
    ACPI_NAMESPACE_NODE     *ParentNode;
    ACPI_OBJECT_TYPE        ChildType;
    UINT32                  Level;
    BOOLEAN                 NodePreviouslyVisited = FALSE;


    ACPI_FUNCTION_TRACE (NsWalkNamespace);


    /* Special case for the namespace Root Node */

    if (StartNode == ACPI_ROOT_OBJECT)
    {
        StartNode = AcpiGbl_RootNode;
    }

    /* Null child means "get first node" */

    ParentNode = StartNode;
    ChildNode = AcpiNsGetNextNode (ParentNode, NULL);
    ChildType = ACPI_TYPE_ANY;
    Level = 1;

    /*
     * Traverse the tree of nodes until we bubble back up to where we
     * started. When Level is zero, the loop is done because we have
     * bubbled up to (and passed) the original parent handle (StartEntry)
     */
    while (Level > 0 && ChildNode)
    {
        Status = AE_OK;

        /* Found next child, get the type if we are not searching for ANY */

        if (Type != ACPI_TYPE_ANY)
        {
            ChildType = ChildNode->Type;
        }

        /*
         * Ignore all temporary namespace nodes (created during control
         * method execution) unless told otherwise. These temporary nodes
         * can cause a race condition because they can be deleted during
         * the execution of the user function (if the namespace is
         * unlocked before invocation of the user function.) Only the
         * debugger namespace dump will examine the temporary nodes.
         */
        if ((ChildNode->Flags & ANOBJ_TEMPORARY) &&
            !(Flags & ACPI_NS_WALK_TEMP_NODES))
        {
            Status = AE_CTRL_DEPTH;
        }

        /* Type must match requested type */

        else if (ChildType == Type)
        {
            /*
             * Found a matching node, invoke the user callback function.
             * Unlock the namespace if flag is set.
             */
            if (Flags & ACPI_NS_WALK_UNLOCK)
            {
                MutexStatus = AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE);
                if (ACPI_FAILURE (MutexStatus))
                {
                    return_ACPI_STATUS (MutexStatus);
                }
            }

            /*
             * Invoke the user function, either descending, ascending,
             * or both.
             */
            if (!NodePreviouslyVisited)
            {
                if (DescendingCallback)
                {
                    Status = DescendingCallback (ChildNode, Level,
                        Context, ReturnValue);
                }
            }
            else
            {
                if (AscendingCallback)
                {
//.........这里部分代码省略.........

acpi_status
acpi_walk_resource_buffer(struct acpi_buffer *buffer,
			  acpi_walk_resource_callback user_function,
			  void *context)
{
	acpi_status status = AE_OK;
	struct acpi_resource *resource;
	struct acpi_resource *resource_end;

	ACPI_FUNCTION_TRACE(acpi_walk_resource_buffer);

	/* Parameter validation */

	if (!buffer || !buffer->pointer || !user_function) {
		return_ACPI_STATUS(AE_BAD_PARAMETER);
	}

	/* Buffer contains the resource list and length */

	resource = ACPI_CAST_PTR(struct acpi_resource, buffer->pointer);
	resource_end =
	    ACPI_ADD_PTR(struct acpi_resource, buffer->pointer, buffer->length);

	/* Walk the resource list until the end_tag is found (or buffer end) */

	while (resource < resource_end) {

		/* Sanity check the resource type */

		if (resource->type > ACPI_RESOURCE_TYPE_MAX) {
			status = AE_AML_INVALID_RESOURCE_TYPE;
			break;
		}

		/* Sanity check the length. It must not be zero, or we loop forever */

		if (!resource->length) {
			return_ACPI_STATUS(AE_AML_BAD_RESOURCE_LENGTH);
		}

		/* Invoke the user function, abort on any error returned */

		status = user_function(resource, context);
		if (ACPI_FAILURE(status)) {
			if (status == AE_CTRL_TERMINATE) {

				/* This is an OK termination by the user function */

				status = AE_OK;
			}
			break;
		}

		/* end_tag indicates end-of-list */

		if (resource->type == ACPI_RESOURCE_TYPE_END_TAG) {
			break;
		}

		/* Get the next resource descriptor */

		resource = ACPI_NEXT_RESOURCE(resource);
	}

	return_ACPI_STATUS(status);
}

acpi_status
acpi_ev_initialize (
	void)
{
	acpi_status             status;


	FUNCTION_TRACE ("Ev_initialize");


	/* Make sure we have ACPI tables */

	if (!acpi_gbl_DSDT) {
		ACPI_DEBUG_PRINT ((ACPI_DB_WARN, "No ACPI tables present!\n"));
		return_ACPI_STATUS (AE_NO_ACPI_TABLES);
	}


	/* Make sure the BIOS supports ACPI mode */

	if (SYS_MODE_LEGACY == acpi_hw_get_mode_capabilities()) {
		ACPI_DEBUG_PRINT ((ACPI_DB_WARN, "ACPI Mode is not supported!\n"));
		return_ACPI_STATUS (AE_ERROR);
	}


	acpi_gbl_original_mode = acpi_hw_get_mode();

	/*
	 * Initialize the Fixed and General Purpose Acpi_events prior. This is
	 * done prior to enabling SCIs to prevent interrupts from occuring
	 * before handers are installed.
	 */
	status = acpi_ev_fixed_event_initialize ();
	if (ACPI_FAILURE (status)) {
		ACPI_DEBUG_PRINT ((ACPI_DB_FATAL, "Unable to initialize fixed events.\n"));
		return_ACPI_STATUS (status);
	}

	status = acpi_ev_gpe_initialize ();
	if (ACPI_FAILURE (status)) {
		ACPI_DEBUG_PRINT ((ACPI_DB_FATAL, "Unable to initialize general purpose events.\n"));
		return_ACPI_STATUS (status);
	}

	/* Install the SCI handler */

	status = acpi_ev_install_sci_handler ();
	if (ACPI_FAILURE (status)) {
		ACPI_DEBUG_PRINT ((ACPI_DB_FATAL, "Unable to install System Control Interrupt Handler\n"));
		return_ACPI_STATUS (status);
	}


	/* Install handlers for control method GPE handlers (_Lxx, _Exx) */

	status = acpi_ev_init_gpe_control_methods ();
	if (ACPI_FAILURE (status)) {
		ACPI_DEBUG_PRINT ((ACPI_DB_FATAL, "Unable to initialize Gpe control methods\n"));
		return_ACPI_STATUS (status);
	}

	/* Install the handler for the Global Lock */

	status = acpi_ev_init_global_lock_handler ();
	if (ACPI_FAILURE (status)) {
		ACPI_DEBUG_PRINT ((ACPI_DB_FATAL, "Unable to initialize Global Lock handler\n"));
		return_ACPI_STATUS (status);
	}


	return_ACPI_STATUS (status);
}

ACPI_STATUS
AcpiInstallNotifyHandler (
    ACPI_HANDLE             Device,
    UINT32                  HandlerType,
    ACPI_NOTIFY_HANDLER     Handler,
    void                    *Context)
{
    ACPI_OPERAND_OBJECT     *ObjDesc;
    ACPI_OPERAND_OBJECT     *NotifyObj;
    ACPI_NAMESPACE_NODE     *Node;
    ACPI_STATUS             Status;


    ACPI_FUNCTION_TRACE (AcpiInstallNotifyHandler);


    /* Parameter validation */

    if ((!Device)  ||
        (!Handler) ||
        (HandlerType > ACPI_MAX_NOTIFY_HANDLER_TYPE))
    {
        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 = AcpiNsValidateHandle (Device);
    if (!Node)
    {
        Status = AE_BAD_PARAMETER;
        goto UnlockAndExit;
    }

    /*
     * Root Object:
     * Registering a notify handler on the root object indicates that the
     * caller wishes to receive notifications for all objects. Note that
     * only one <external> global handler can be regsitered (per notify type).
     */
    if (Device == ACPI_ROOT_OBJECT)
    {
        /* Make sure the handler is not already installed */

        if (((HandlerType & ACPI_SYSTEM_NOTIFY) &&
                AcpiGbl_SystemNotify.Handler)       ||
            ((HandlerType & ACPI_DEVICE_NOTIFY) &&
                AcpiGbl_DeviceNotify.Handler))
        {
            Status = AE_ALREADY_EXISTS;
            goto UnlockAndExit;
        }

        if (HandlerType & ACPI_SYSTEM_NOTIFY)
        {
            AcpiGbl_SystemNotify.Node    = Node;
            AcpiGbl_SystemNotify.Handler = Handler;
            AcpiGbl_SystemNotify.Context = Context;
        }

        if (HandlerType & ACPI_DEVICE_NOTIFY)
        {
            AcpiGbl_DeviceNotify.Node    = Node;
            AcpiGbl_DeviceNotify.Handler = Handler;
            AcpiGbl_DeviceNotify.Context = Context;
        }

        /* Global notify handler installed */
    }

    /*
     * All Other Objects:
     * Caller will only receive notifications specific to the target object.
     * Note that only certain object types can receive notifications.
     */
    else
    {
        /* Notifies allowed on this object? */

        if (!AcpiEvIsNotifyObject (Node))
        {
            Status = AE_TYPE;
            goto UnlockAndExit;
        }

        /* Check for an existing internal object */

        ObjDesc = AcpiNsGetAttachedObject (Node);
        if (ObjDesc)
        {
            /* Object exists - make sure there's no handler */

            if (((HandlerType & ACPI_SYSTEM_NOTIFY) &&
                    ObjDesc->CommonNotify.SystemNotify)   ||
//.........这里部分代码省略.........

acpi_status
acpi_ut_walk_package_tree (
	union acpi_operand_object       *source_object,
	void                            *target_object,
	acpi_pkg_callback               walk_callback,
	void                            *context)
{
	acpi_status                     status = AE_OK;
	union acpi_generic_state        *state_list = NULL;
	union acpi_generic_state        *state;
	u32                             this_index;
	union acpi_operand_object       *this_source_obj;


	ACPI_FUNCTION_TRACE ("ut_walk_package_tree");


	state = acpi_ut_create_pkg_state (source_object, target_object, 0);
	if (!state) {
		return_ACPI_STATUS (AE_NO_MEMORY);
	}

	while (state) {
		/* Get one element of the package */

		this_index    = state->pkg.index;
		this_source_obj = (union acpi_operand_object *)
				  state->pkg.source_object->package.elements[this_index];

		/*
		 * Check for:
		 * 1) An uninitialized package element.  It is completely
		 *    legal to declare a package and leave it uninitialized
		 * 2) Not an internal object - can be a namespace node instead
		 * 3) Any type other than a package.  Packages are handled in else
		 *    case below.
		 */
		if ((!this_source_obj) ||
			(ACPI_GET_DESCRIPTOR_TYPE (this_source_obj) != ACPI_DESC_TYPE_OPERAND) ||
			(ACPI_GET_OBJECT_TYPE (this_source_obj) != ACPI_TYPE_PACKAGE)) {
			status = walk_callback (ACPI_COPY_TYPE_SIMPLE, this_source_obj,
					 state, context);
			if (ACPI_FAILURE (status)) {
				return_ACPI_STATUS (status);
			}

			state->pkg.index++;
			while (state->pkg.index >= state->pkg.source_object->package.count) {
				/*
				 * We've handled all of the objects at this level,  This means
				 * that we have just completed a package.  That package may
				 * have contained one or more packages itself.
				 *
				 * Delete this state and pop the previous state (package).
				 */
				acpi_ut_delete_generic_state (state);
				state = acpi_ut_pop_generic_state (&state_list);

				/* Finished when there are no more states */

				if (!state) {
					/*
					 * We have handled all of the objects in the top level
					 * package just add the length of the package objects
					 * and exit
					 */
					return_ACPI_STATUS (AE_OK);
				}

				/*
				 * Go back up a level and move the index past the just
				 * completed package object.
				 */
				state->pkg.index++;
			}
		}
		else {
			/* This is a subobject of type package */

			status = walk_callback (ACPI_COPY_TYPE_PACKAGE, this_source_obj,
					  state, context);
			if (ACPI_FAILURE (status)) {
				return_ACPI_STATUS (status);
			}

			/*
			 * Push the current state and create a new one
			 * The callback above returned a new target package object.
			 */
			acpi_ut_push_generic_state (&state_list, state);
			state = acpi_ut_create_pkg_state (this_source_obj,
					   state->pkg.this_target_obj, 0);
			if (!state) {
				return_ACPI_STATUS (AE_NO_MEMORY);
			}
		}
	}

	/* We should never get here */

//.........这里部分代码省略.........

ACPI_STATUS
AcpiRemoveNotifyHandler (
    ACPI_HANDLE             Device,
    UINT32                  HandlerType,
    ACPI_NOTIFY_HANDLER     Handler)
{
    ACPI_OPERAND_OBJECT     *NotifyObj;
    ACPI_OPERAND_OBJECT     *ObjDesc;
    ACPI_NAMESPACE_NODE     *Node;
    ACPI_STATUS             Status;


    ACPI_FUNCTION_TRACE (AcpiRemoveNotifyHandler);


    /* Parameter validation */

    if ((!Device)  ||
        (!Handler) ||
        (HandlerType > ACPI_MAX_NOTIFY_HANDLER_TYPE))
    {
        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 = AcpiNsValidateHandle (Device);
    if (!Node)
    {
        Status = AE_BAD_PARAMETER;
        goto UnlockAndExit;
    }

    /* Root Object */

    if (Device == ACPI_ROOT_OBJECT)
    {
        ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
            "Removing notify handler for namespace root object\n"));

        if (((HandlerType & ACPI_SYSTEM_NOTIFY) &&
              !AcpiGbl_SystemNotify.Handler)        ||
            ((HandlerType & ACPI_DEVICE_NOTIFY) &&
              !AcpiGbl_DeviceNotify.Handler))
        {
            Status = AE_NOT_EXIST;
            goto UnlockAndExit;
        }

        if (HandlerType & ACPI_SYSTEM_NOTIFY)
        {
            AcpiGbl_SystemNotify.Node    = NULL;
            AcpiGbl_SystemNotify.Handler = NULL;
            AcpiGbl_SystemNotify.Context = NULL;
        }

        if (HandlerType & ACPI_DEVICE_NOTIFY)
        {
            AcpiGbl_DeviceNotify.Node    = NULL;
            AcpiGbl_DeviceNotify.Handler = NULL;
            AcpiGbl_DeviceNotify.Context = NULL;
        }
    }

    /* All Other Objects */

    else
    {
        /* Notifies allowed on this object? */

        if (!AcpiEvIsNotifyObject (Node))
        {
            Status = AE_TYPE;
            goto UnlockAndExit;
        }

        /* Check for an existing internal object */

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

        /* Object exists - make sure there's an existing handler */

        if (HandlerType & ACPI_SYSTEM_NOTIFY)
        {
            NotifyObj = ObjDesc->CommonNotify.SystemNotify;
            if (!NotifyObj)
            {
                Status = AE_NOT_EXIST;
                goto UnlockAndExit;
//.........这里部分代码省略.........

acpi_status
acpi_ut_strtoul64 (
	char                            *string,
	u32                             base,
	acpi_integer                    *ret_integer)
{
	u32                             this_digit;
	acpi_integer                    return_value = 0;
	acpi_integer                    quotient;


	ACPI_FUNCTION_TRACE ("ut_stroul64");


	switch (base) {
	case ACPI_ANY_BASE:
	case 10:
	case 16:
		break;

	default:
		/* Invalid Base */
		return_ACPI_STATUS (AE_BAD_PARAMETER);
	}

	/* Skip over any white space in the buffer */

	while (ACPI_IS_SPACE (*string) || *string == '\t') {
		++string;
	}

	/*
	 * If the input parameter Base is zero, then we need to
	 * determine if it is decimal or hexadecimal:
	 */
	if (base == 0) {
		if ((*string == '0') &&
			(ACPI_TOLOWER (*(++string)) == 'x')) {
			base = 16;
			++string;
		}
		else {
			base = 10;
		}
	}

	/*
	 * For hexadecimal base, skip over the leading
	 * 0 or 0x, if they are present.
	 */
	if (base == 16 &&
		*string == '0' &&
		ACPI_TOLOWER (*(++string)) == 'x') {
		string++;
	}

	/* Any string left? */

	if (!(*string)) {
		goto error_exit;
	}

	/* Main loop: convert the string to a 64-bit integer */

	while (*string) {
		if (ACPI_IS_DIGIT (*string)) {
			/* Convert ASCII 0-9 to Decimal value */

			this_digit = ((u8) *string) - '0';
		}
		else {
			this_digit = (u8) ACPI_TOUPPER (*string);
			if (ACPI_IS_UPPER ((char) this_digit)) {
				/* Convert ASCII Hex char to value */

				this_digit = this_digit - 'A' + 10;
			}
			else {
				goto error_exit;
			}
		}

		/* Check to see if digit is out of range */

		if (this_digit >= base) {
			goto error_exit;
		}

		/* Divide the digit into the correct position */

		(void) acpi_ut_short_divide ((ACPI_INTEGER_MAX - (acpi_integer) this_digit),
				 base, &quotient, NULL);
		if (return_value > quotient) {
			goto error_exit;
		}

		return_value *= base;
		return_value += this_digit;
		++string;
	}
//.........这里部分代码省略.........

ACPI_STATUS
AcpiRemoveGpeHandler (
    ACPI_HANDLE             GpeDevice,
    UINT32                  GpeNumber,
    ACPI_EVENT_HANDLER      Address)
{
    ACPI_GPE_EVENT_INFO     *GpeEventInfo;
    ACPI_HANDLER_INFO       *Handler;
    ACPI_STATUS             Status;
    ACPI_CPU_FLAGS          Flags;


    ACPI_FUNCTION_TRACE (AcpiRemoveGpeHandler);


    /* Parameter validation */

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

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

    /* Ensure that we have a valid GPE number */

    GpeEventInfo = AcpiEvGetGpeEventInfo (GpeDevice, GpeNumber);
    if (!GpeEventInfo)
    {
        Status = AE_BAD_PARAMETER;
        goto UnlockAndExit;
    }

    /* Make sure that a handler is indeed installed */

    if ((GpeEventInfo->Flags & ACPI_GPE_DISPATCH_MASK) !=
            ACPI_GPE_DISPATCH_HANDLER)
    {
        Status = AE_NOT_EXIST;
        goto UnlockAndExit;
    }

    /* Make sure that the installed handler is the same */

    if (GpeEventInfo->Dispatch.Handler->Address != Address)
    {
        Status = AE_BAD_PARAMETER;
        goto UnlockAndExit;
    }

    /* Disable the GPE before removing the handler */

    Status = AcpiEvDisableGpe (GpeEventInfo);
    if (ACPI_FAILURE (Status))
    {
        goto UnlockAndExit;
    }

    /* Remove the handler */

    Flags = AcpiOsAcquireLock (AcpiGbl_GpeLock);
    Handler = GpeEventInfo->Dispatch.Handler;

    /* Restore Method node (if any), set dispatch flags */

    GpeEventInfo->Dispatch.MethodNode = Handler->MethodNode;
    GpeEventInfo->Flags &= ~ACPI_GPE_DISPATCH_MASK;  /* Clear bits */
    if (Handler->MethodNode)
    {
        GpeEventInfo->Flags |= ACPI_GPE_DISPATCH_METHOD;
    }
    AcpiOsReleaseLock (AcpiGbl_GpeLock, Flags);

    /* Now we can free the handler object */

    ACPI_FREE (Handler);


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

ACPI_STATUS
AcpiDsInitAmlWalk (
    ACPI_WALK_STATE         *WalkState,
    ACPI_PARSE_OBJECT       *Op,
    ACPI_NAMESPACE_NODE     *MethodNode,
    UINT8                   *AmlStart,
    UINT32                  AmlLength,
    ACPI_EVALUATE_INFO      *Info,
    UINT8                   PassNumber)
{
    ACPI_STATUS             Status;
    ACPI_PARSE_STATE        *ParserState = &WalkState->ParserState;
    ACPI_PARSE_OBJECT       *ExtraOp;


    ACPI_FUNCTION_TRACE (DsInitAmlWalk);


    WalkState->ParserState.Aml =
    WalkState->ParserState.AmlStart = AmlStart;
    WalkState->ParserState.AmlEnd =
    WalkState->ParserState.PkgEnd = AmlStart + AmlLength;

    /* The NextOp of the NextWalk will be the beginning of the method */

    WalkState->NextOp = NULL;
    WalkState->PassNumber = PassNumber;

    if (Info)
    {
        WalkState->Params = Info->Parameters;
        WalkState->CallerReturnDesc = &Info->ReturnObject;
    }

    Status = AcpiPsInitScope (&WalkState->ParserState, Op);
    if (ACPI_FAILURE (Status))
    {
        return_ACPI_STATUS (Status);
    }

    if (MethodNode)
    {
        WalkState->ParserState.StartNode = MethodNode;
        WalkState->WalkType = ACPI_WALK_METHOD;
        WalkState->MethodNode = MethodNode;
        WalkState->MethodDesc = AcpiNsGetAttachedObject (MethodNode);

        /* Push start scope on scope stack and make it current  */

        Status = AcpiDsScopeStackPush (MethodNode, ACPI_TYPE_METHOD, WalkState);
        if (ACPI_FAILURE (Status))
        {
            return_ACPI_STATUS (Status);
        }

        /* Init the method arguments */

        Status = AcpiDsMethodDataInitArgs (WalkState->Params,
                    ACPI_METHOD_NUM_ARGS, WalkState);
        if (ACPI_FAILURE (Status))
        {
            return_ACPI_STATUS (Status);
        }
    }
    else
    {
        /*
         * Setup the current scope.
         * Find a Named Op that has a namespace node associated with it.
         * search upwards from this Op. Current scope is the first
         * Op with a namespace node.
         */
        ExtraOp = ParserState->StartOp;
        while (ExtraOp && !ExtraOp->Common.Node)
        {
            ExtraOp = ExtraOp->Common.Parent;
        }

        if (!ExtraOp)
        {
            ParserState->StartNode = NULL;
        }
        else
        {
            ParserState->StartNode = ExtraOp->Common.Node;
        }

        if (ParserState->StartNode)
        {
            /* Push start scope on scope stack and make