nsutils.c

linux-2.6.15.6

	info.internal_name = internal_name;
	status = acpi_ns_build_internal_name(&info);
	if (ACPI_FAILURE(status)) {
		ACPI_MEM_FREE(internal_name);
		return_ACPI_STATUS(status);
	}

	*converted_name = internal_name;
	return_ACPI_STATUS(AE_OK);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_externalize_name
 *
 * PARAMETERS:  internal_name_length - Lenth of the internal name below
 *              internal_name       - Internal representation of name
 *              converted_name_length - Where the length is returned
 *              converted_name      - Where the resulting external name
 *                                    is returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Convert internal name (e.g. 5c 2f 02 5f 50 52 5f 43 50 55 30)
 *              to its external (printable) form (e.g. "\_PR_.CPU0")
 *
 ******************************************************************************/

acpi_status
acpi_ns_externalize_name(u32 internal_name_length,
			 char *internal_name,
			 u32 * converted_name_length, char **converted_name)
{
	acpi_native_uint names_index = 0;
	acpi_native_uint num_segments = 0;
	acpi_native_uint required_length;
	acpi_native_uint prefix_length = 0;
	acpi_native_uint i = 0;
	acpi_native_uint j = 0;

	ACPI_FUNCTION_TRACE("ns_externalize_name");

	if (!internal_name_length || !internal_name || !converted_name) {
		return_ACPI_STATUS(AE_BAD_PARAMETER);
	}

	/*
	 * Check for a prefix (one '\' | one or more '^').
	 */
	switch (internal_name[0]) {
	case '\\':
		prefix_length = 1;
		break;

	case '^':
		for (i = 0; i < internal_name_length; i++) {
			if (internal_name[i] == '^') {
				prefix_length = i + 1;
			} else {
				break;
			}
		}

		if (i == internal_name_length) {
			prefix_length = i;
		}

		break;

	default:
		break;
	}

	/*
	 * Check for object names.  Note that there could be 0-255 of these
	 * 4-byte elements.
	 */
	if (prefix_length < internal_name_length) {
		switch (internal_name[prefix_length]) {
		case AML_MULTI_NAME_PREFIX_OP:

			/* <count> 4-byte names */

			names_index = prefix_length + 2;
			num_segments = (acpi_native_uint) (u8)
			    internal_name[(acpi_native_uint)
					  (prefix_length + 1)];
			break;

		case AML_DUAL_NAME_PREFIX:

			/* Two 4-byte names */

			names_index = prefix_length + 1;
			num_segments = 2;
			break;

		case 0:

			/* null_name */

			names_index = 0;
			num_segments = 0;
			break;

		default:

			/* one 4-byte name */

			names_index = prefix_length;
			num_segments = 1;
			break;
		}
	}

	/*
	 * Calculate the length of converted_name, which equals the length
	 * of the prefix, length of all object names, length of any required
	 * punctuation ('.') between object names, plus the NULL terminator.
	 */
	required_length = prefix_length + (4 * num_segments) +
	    ((num_segments > 0) ? (num_segments - 1) : 0) + 1;

	/*
	 * Check to see if we're still in bounds.  If not, there's a problem
	 * with internal_name (invalid format).
	 */
	if (required_length > internal_name_length) {
		ACPI_REPORT_ERROR(("ns_externalize_name: Invalid internal name\n"));
		return_ACPI_STATUS(AE_BAD_PATHNAME);
	}

	/*
	 * Build converted_name
	 */
	*converted_name = ACPI_MEM_CALLOCATE(required_length);
	if (!(*converted_name)) {
		return_ACPI_STATUS(AE_NO_MEMORY);
	}

	j = 0;

	for (i = 0; i < prefix_length; i++) {
		(*converted_name)[j++] = internal_name[i];
	}

	if (num_segments > 0) {
		for (i = 0; i < num_segments; i++) {
			if (i > 0) {
				(*converted_name)[j++] = '.';
			}

			(*converted_name)[j++] = internal_name[names_index++];
			(*converted_name)[j++] = internal_name[names_index++];
			(*converted_name)[j++] = internal_name[names_index++];
			(*converted_name)[j++] = internal_name[names_index++];
		}
	}

	if (converted_name_length) {
		*converted_name_length = (u32) required_length;
	}

	return_ACPI_STATUS(AE_OK);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_map_handle_to_node
 *
 * PARAMETERS:  Handle          - Handle to be converted to an Node
 *
 * RETURN:      A Name table entry pointer
 *
 * DESCRIPTION: Convert a namespace handle to a real Node
 *
 * Note: Real integer handles would allow for more verification
 *       and keep all pointers within this subsystem - however this introduces
 *       more (and perhaps unnecessary) overhead.
 *
 ******************************************************************************/

struct acpi_namespace_node *acpi_ns_map_handle_to_node(acpi_handle handle)
{

	ACPI_FUNCTION_ENTRY();

	/*
	 * Simple implementation.
	 */
	if (!handle) {
		return (NULL);
	}

	if (handle == ACPI_ROOT_OBJECT) {
		return (acpi_gbl_root_node);
	}

	/* We can at least attempt to verify the handle */

	if (ACPI_GET_DESCRIPTOR_TYPE(handle) != ACPI_DESC_TYPE_NAMED) {
		return (NULL);
	}

	return ((struct acpi_namespace_node *)handle);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_convert_entry_to_handle
 *
 * PARAMETERS:  Node          - Node to be converted to a Handle
 *
 * RETURN:      A user handle
 *
 * DESCRIPTION: Convert a real Node to a namespace handle
 *
 ******************************************************************************/

acpi_handle acpi_ns_convert_entry_to_handle(struct acpi_namespace_node *node)
{

	/*
	 * Simple implementation for now;
	 */
	return ((acpi_handle) node);

/* Example future implementation ---------------------

	if (!Node)
	{
		return (NULL);
	}

	if (Node == acpi_gbl_root_node)
	{
		return (ACPI_ROOT_OBJECT);
	}

	return ((acpi_handle) Node);
------------------------------------------------------*/
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_terminate
 *
 * PARAMETERS:  none
 *
 * RETURN:      none
 *
 * DESCRIPTION: free memory allocated for namespace and ACPI table storage.
 *
 ******************************************************************************/

void acpi_ns_terminate(void)
{
	union acpi_operand_object *obj_desc;

	ACPI_FUNCTION_TRACE("ns_terminate");

	/*
	 * 1) Free the entire namespace -- all nodes and objects
	 *
	 * Delete all object descriptors attached to namepsace nodes
	 */
	acpi_ns_delete_namespace_subtree(acpi_gbl_root_node);

	/* Detach any objects attached to the root */

	obj_desc = acpi_ns_get_attached_object(acpi_gbl_root_node);
	if (obj_desc) {
		acpi_ns_detach_object(acpi_gbl_root_node);
	}

	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Namespace freed\n"));

	/*
	 * 2) Now we can delete the ACPI tables
	 */
	acpi_tb_delete_all_tables();
	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "ACPI Tables freed\n"));

	return_VOID;
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_opens_scope
 *
 * PARAMETERS:  Type        - A valid namespace type
 *
 * RETURN:      NEWSCOPE if the passed type "opens a name scope" according
 *              to the ACPI specification, else 0
 *
 ******************************************************************************/

u32 acpi_ns_opens_scope(acpi_object_type type)
{
	ACPI_FUNCTION_TRACE_STR("ns_opens_scope", acpi_ut_get_type_name(type));

	if (!acpi_ut_valid_object_type(type)) {
		/* type code out of range  */

		ACPI_REPORT_WARNING(("ns_opens_scope: Invalid Object Type %X\n",
				     type));
		return_VALUE(ACPI_NS_NORMAL);
	}

	return_VALUE(((u32) acpi_gbl_ns_properties[type]) & ACPI_NS_NEWSCOPE);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_get_node_by_path
 *
 * PARAMETERS:  *Pathname   - Name to be found, in external (ASL) format. The
 *                            \ (backslash) and ^ (carat) prefixes, and the
 *                            . (period) to separate segments are supported.
 *              start_node  - Root of subtree to be searched, or NS_ALL for the
 *                            root of the name space.  If Name is fully
 *                            qualified (first s8 is '\'), the passed value
 *                            of Scope will not be accessed.
 *              Flags       - Used to indicate whether to perform upsearch or
 *                            not.
 *              return_node - Where the Node is returned
 *
 * DESCRIPTION: Look up a name relative to a given scope and return the
 *              corresponding Node.  NOTE: Scope can be null.
 *
 * MUTEX:       Locks namespace
 *
 ******************************************************************************/

acpi_status
acpi_ns_get_node_by_path(char *pathname,
			 struct acpi_namespace_node *start_node,
			 u32 flags, struct acpi_namespace_node **return_node)
{
	union acpi_generic_state scope_info;
	acpi_status status;
	char *internal_path = NULL;

	ACPI_FUNCTION_TRACE_PTR("ns_get_node_by_path", pathname);

	if (pathname) {
		/* Convert path to internal representation */

		status = acpi_ns_internalize_name(pathname, &internal_path);
		if (ACPI_FAILURE(status)) {
			return_ACPI_STATUS(status);
		}
	}

	/* Must lock namespace during lookup */

	status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
	if (ACPI_FAILURE(status)) {
		goto cleanup;
	}

	/* Setup lookup scope (search starting point) */

	scope_info.scope.node = start_node;

	/* Lookup the name in the namespace */

	status = acpi_ns_lookup(&scope_info, internal_path,
				ACPI_TYPE_ANY, ACPI_IMODE_EXECUTE,
				(flags | ACPI_NS_DONT_OPEN_SCOPE),
				NULL, return_node);
	if (ACPI_FAILURE(status)) {
		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "%s, %s\n",
				  internal_path,
				  acpi_format_exception(status)));
	}

	(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);

      cleanup:
	if (internal_path) {
		ACPI_MEM_FREE(internal_path);
	}
	return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_get_parent_node
 *
 * PARAMETERS:  Node       - Current table entry
 *
 * RETURN:      Parent entry of the given entry
 *
 * DESCRIPTION: Obtain the parent entry for a given entry in the namespace.
 *
 ******************************************************************************/

struct acpi_namespace_node *acpi_ns_get_parent_node(struct acpi_namespace_node
						    *node)
{
	ACPI_FUNCTION_ENTRY();

	if (!node) {
		return (NULL);
	}

	/*
	 * Walk to the end of this peer list. The last entry is marked with a flag
	 * and the peer pointer is really a pointer back to the parent. This saves
	 * putting a parent back pointer in each and every named object!
	 */
	while (!(node->flags & ANOBJ_END_OF_PEER_LIST)) {
		node = node->peer;
	}

	return (node->peer);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_get_next_valid_node
 *
 * PARAMETERS:  Node       - Current table entry
 *
 * RETURN:      Next valid Node in the linked node list. NULL if no more valid
 *              nodes.
 *
 * DESCRIPTION: Find the next valid node within a name table.
 *              Useful for implementing NULL-end-of-list loops.
 *
 ******************************************************************************/

struct acpi_namespace_node *acpi_ns_get_next_valid_node(struct
							acpi_namespace_node
							*node)
{

	/* If we are at the end of this peer list, return NULL */

	if (node->flags & ANOBJ_END_OF_PEER_LIST) {
		return NULL;
	}

	/* Otherwise just return the next peer */

	return (node->peer);
}

#ifdef ACPI_OBSOLETE_FUNCTIONS
/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_find_parent_name
 *
 * PARAMETERS:  *child_node            - Named Obj whose name is to be found
 *
 * RETURN:      The ACPI name
 *
 * DESCRIPTION: Search for the given obj in its parent scope and return the
 *              name segment, or "????" if the parent name can't be found
 *              (which "should not happen").
 *
 ******************************************************************************/

acpi_name acpi_ns_find_parent_name(struct acpi_namespace_node * child_node)
{
	struct acpi_namespace_node *parent_node;

	ACPI_FUNCTION_TRACE("ns_find_parent_name");

	if (child_node) {
		/* Valid entry.  Get the parent Node */

		parent_node = acpi_ns_get_parent_node(child_node);
		if (parent_node) {
			ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
					  "Parent of %p [%4.4s] is %p [%4.4s]\n",
					  child_node,
					  acpi_ut_get_node_name(child_node),
					  parent_node,
					  acpi_ut_get_node_name(parent_node)));

			if (parent_node->name.integer) {
				return_VALUE((acpi_name) parent_node->name.
					     integer);
			}
		}

		ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
				  "Unable to find parent of %p (%4.4s)\n",
				  child_node,
				  acpi_ut_get_node_name(child_node)));
	}

	return_VALUE(ACPI_UNKNOWN_NAME);
}
#endif