evrgnini.c

h内核

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

	status = acpi_ut_evaluate_numeric_object (METHOD_NAME__SEG, pci_root_node, &pci_value);
	if (ACPI_SUCCESS (status)) {
		pci_id->segment = ACPI_LOWORD (pci_value);
	}

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

	status = acpi_ut_evaluate_numeric_object (METHOD_NAME__BBN, pci_root_node, &pci_value);
	if (ACPI_SUCCESS (status)) {
		pci_id->bus = ACPI_LOWORD (pci_value);
	}

	/* Complete this device's pci_id */

	acpi_os_derive_pci_id (pci_root_node, region_obj->region.node, &pci_id);

	*region_context = pci_id;
	return_ACPI_STATUS (AE_OK);
}


/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_pci_bar_region_setup
 *
 * PARAMETERS:  Handle              - Region we are interested in
 *              Function            - Start or stop
 *              handler_context     - Address space handler context
 *              region_context      - Region specific context
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Do any prep work for region handling
 *
 * MUTEX:       Assumes namespace is not locked
 *
 ******************************************************************************/

acpi_status
acpi_ev_pci_bar_region_setup (
	acpi_handle                     handle,
	u32                             function,
	void                            *handler_context,
	void                            **region_context)
{
	ACPI_FUNCTION_TRACE ("ev_pci_bar_region_setup");


	return_ACPI_STATUS (AE_OK);
}


/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_cmos_region_setup
 *
 * PARAMETERS:  Handle              - Region we are interested in
 *              Function            - Start or stop
 *              handler_context     - Address space handler context
 *              region_context      - Region specific context
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Do any prep work for region handling
 *
 * MUTEX:       Assumes namespace is not locked
 *
 ******************************************************************************/

acpi_status
acpi_ev_cmos_region_setup (
	acpi_handle                     handle,
	u32                             function,
	void                            *handler_context,
	void                            **region_context)
{
	ACPI_FUNCTION_TRACE ("ev_cmos_region_setup");


	return_ACPI_STATUS (AE_OK);
}


/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_default_region_setup
 *
 * PARAMETERS:  Handle              - Region we are interested in
 *              Function            - Start or stop
 *              handler_context     - Address space handler context
 *              region_context      - Region specific context
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Do any prep work for region handling
 *
 ******************************************************************************/

acpi_status
acpi_ev_default_region_setup (
	acpi_handle                     handle,
	u32                             function,
	void                            *handler_context,
	void                            **region_context)
{
	ACPI_FUNCTION_TRACE ("ev_default_region_setup");


	if (function == ACPI_REGION_DEACTIVATE) {
		*region_context = NULL;
	}
	else {
		*region_context = handler_context;
	}

	return_ACPI_STATUS (AE_OK);
}


/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_initialize_region
 *
 * PARAMETERS:  region_obj      - Region we are initializing
 *              acpi_ns_locked  - 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.
 *
 ******************************************************************************/

acpi_status
acpi_ev_initialize_region (
	union acpi_operand_object       *region_obj,
	u8                              acpi_ns_locked)
{
	union acpi_operand_object       *handler_obj;
	union acpi_operand_object       *obj_desc;
	acpi_adr_space_type             space_id;
	struct acpi_namespace_node      *node;
	acpi_status                     status;
	struct acpi_namespace_node      *method_node;
	acpi_name                       *reg_name_ptr = (acpi_name *) METHOD_NAME__REG;
	union acpi_operand_object       *region_obj2;


	ACPI_FUNCTION_TRACE_U32 ("ev_initialize_region", acpi_ns_locked);


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

	if (region_obj->common.flags & AOPOBJ_OBJECT_INITIALIZED) {
		return_ACPI_STATUS (AE_OK);
	}

	region_obj2 = acpi_ns_get_secondary_object (region_obj);
	if (!region_obj2) {
		return_ACPI_STATUS (AE_NOT_EXIST);
	}

	node = acpi_ns_get_parent_node (region_obj->region.node);
	space_id = region_obj->region.space_id;

	/* Setup defaults */

	region_obj->region.handler = NULL;
	region_obj2->extra.method_REG = NULL;
	region_obj->common.flags &= ~(AOPOBJ_SETUP_COMPLETE);
	region_obj->common.flags |= AOPOBJ_OBJECT_INITIALIZED;

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

	status = acpi_ns_search_node (*reg_name_ptr, node,
			  ACPI_TYPE_METHOD, &method_node);
	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
		 */
		region_obj2->extra.method_REG = method_node;
	}

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

		handler_obj = NULL;
		obj_desc = acpi_ns_get_attached_object (node);
		if (obj_desc) {
			/* Can only be a handler if the object exists */

			switch (node->type) {
			case ACPI_TYPE_DEVICE:

				handler_obj = obj_desc->device.handler;
				break;

			case ACPI_TYPE_PROCESSOR:

				handler_obj = obj_desc->processor.handler;
				break;

			case ACPI_TYPE_THERMAL:

				handler_obj = obj_desc->thermal_zone.handler;
				break;

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

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

				if (handler_obj->address_space.space_id == space_id) {
					/* Found correct handler */

					ACPI_DEBUG_PRINT ((ACPI_DB_OPREGION,
						"Found handler %p for region %p in obj %p\n",
						handler_obj, region_obj, obj_desc));

					status = acpi_ev_attach_region (handler_obj, region_obj,
							 acpi_ns_locked);

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

					status = acpi_ev_execute_reg_method (region_obj, 1);

					if (acpi_ns_locked) {
						status = acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE);
						if (ACPI_FAILURE (status)) {
							return_ACPI_STATUS (status);
						}
					}

					return_ACPI_STATUS (AE_OK);
				}

				/* Try next handler in the list */

				handler_obj = handler_obj->address_space.next;
			}
		}

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

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

	ACPI_DEBUG_PRINT ((ACPI_DB_OPREGION,
		"No handler for region_type %s(%X) (region_obj %p)\n",
		acpi_ut_get_region_name (space_id), space_id, region_obj));

	return_ACPI_STATUS (AE_NOT_EXIST);
}