drivers/acpi/acpica/nsutils.c - kernel/msm-4.9 - Gitiles

 /******************************************************************************
  *
  * Module Name: nsutils - Utilities for accessing ACPI namespace, accessing
  *                        parents and siblings and Scope manipulation
  *
  *****************************************************************************/

 /*
  * Copyright (C) 2000 - 2013, Intel Corp.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions, and the following disclaimer,
  *    without modification.
  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  *    substantially similar to the "NO WARRANTY" disclaimer below
  *    ("Disclaimer") and any redistribution must be conditioned upon
  *    including a substantially similar Disclaimer requirement for further
  *    binary redistribution.
  * 3. Neither the names of the above-listed copyright holders nor the names
  *    of any contributors may be used to endorse or promote products derived
  *    from this software without specific prior written permission.
  *
  * Alternatively, this software may be distributed under the terms of the
  * GNU General Public License ("GPL") version 2 as published by the Free
  * Software Foundation.
  *
  * NO WARRANTY
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  * POSSIBILITY OF SUCH DAMAGES.
  */

 #include <acpi/acpi.h>
 #include "accommon.h"
 #include "acnamesp.h"
 #include "amlcode.h"

 #define _COMPONENT          ACPI_NAMESPACE
 ACPI_MODULE_NAME("nsutils")

 /* Local prototypes */
 #ifdef ACPI_OBSOLETE_FUNCTIONS
 acpi_name acpi_ns_find_parent_name(struct acpi_namespace_node *node_to_search);
 #endif

 /*******************************************************************************
  *
  * FUNCTION:    acpi_ns_print_node_pathname
  *
  * PARAMETERS:  node            - Object
  *              message         - Prefix message
  *
  * DESCRIPTION: Print an object's full namespace pathname
  *              Manages allocation/freeing of a pathname buffer
  *
  ******************************************************************************/

 void
 acpi_ns_print_node_pathname(struct acpi_namespace_node *node,
 			    const char *message)
 {
 	struct acpi_buffer buffer;
 	acpi_status status;

 	if (!node) {
 		acpi_os_printf("[NULL NAME]");
 		return;
 	}

 	/* Convert handle to full pathname and print it (with supplied message) */

 	buffer.length = ACPI_ALLOCATE_LOCAL_BUFFER;

 	status = acpi_ns_handle_to_pathname(node, &buffer);
 	if (ACPI_SUCCESS(status)) {
 		if (message) {
 			acpi_os_printf("%s ", message);
 		}

 		acpi_os_printf("[%s] (Node %p)", (char *)buffer.pointer, node);
 		ACPI_FREE(buffer.pointer);
 	}
 }

 /*******************************************************************************
  *
  * FUNCTION:    acpi_ns_get_type
  *
  * PARAMETERS:  node        - Parent Node to be examined
  *
  * RETURN:      Type field from Node whose handle is passed
  *
  * DESCRIPTION: Return the type of a Namespace node
  *
  ******************************************************************************/

 acpi_object_type acpi_ns_get_type(struct acpi_namespace_node * node)
 {
 	ACPI_FUNCTION_TRACE(ns_get_type);

 	if (!node) {
 		ACPI_WARNING((AE_INFO, "Null Node parameter"));
 		return_UINT8(ACPI_TYPE_ANY);
 	}

 	return_UINT8(node->type);
 }

 /*******************************************************************************
  *
  * FUNCTION:    acpi_ns_local
  *
  * PARAMETERS:  type        - A namespace object type
  *
  * RETURN:      LOCAL if names must be found locally in objects of the
  *              passed type, 0 if enclosing scopes should be searched
  *
  * DESCRIPTION: Returns scope rule for the given object type.
  *
  ******************************************************************************/

 u32 acpi_ns_local(acpi_object_type type)
 {
 	ACPI_FUNCTION_TRACE(ns_local);

 	if (!acpi_ut_valid_object_type(type)) {

 		/* Type code out of range  */

 		ACPI_WARNING((AE_INFO, "Invalid Object Type 0x%X", type));
 		return_UINT32(ACPI_NS_NORMAL);
 	}

 	return_UINT32(acpi_gbl_ns_properties[type] & ACPI_NS_LOCAL);
 }

 /*******************************************************************************
  *
  * FUNCTION:    acpi_ns_get_internal_name_length
  *
  * PARAMETERS:  info            - Info struct initialized with the
  *                                external name pointer.
  *
  * RETURN:      None
  *
  * DESCRIPTION: Calculate the length of the internal (AML) namestring
  *              corresponding to the external (ASL) namestring.
  *
  ******************************************************************************/

 void acpi_ns_get_internal_name_length(struct acpi_namestring_info *info)
 {
 	const char *next_external_char;
 	u32 i;

 	ACPI_FUNCTION_ENTRY();

 	next_external_char = info->external_name;
 	info->num_carats = 0;
 	info->num_segments = 0;
 	info->fully_qualified = FALSE;

 	/*
 	 * For the internal name, the required length is 4 bytes per segment, plus
 	 * 1 each for root_prefix, multi_name_prefix_op, segment count, trailing null
 	 * (which is not really needed, but no there's harm in putting it there)
 	 *
 	 * strlen() + 1 covers the first name_seg, which has no path separator
 	 */
 	if (ACPI_IS_ROOT_PREFIX(*next_external_char)) {
 		info->fully_qualified = TRUE;
 		next_external_char++;

 		/* Skip redundant root_prefix, like \\_SB.PCI0.SBRG.EC0 */

 		while (ACPI_IS_ROOT_PREFIX(*next_external_char)) {
 			next_external_char++;
 		}
 	} else {
 		/* Handle Carat prefixes */

 		while (ACPI_IS_PARENT_PREFIX(*next_external_char)) {
 			info->num_carats++;
 			next_external_char++;
 		}
 	}

 	/*
 	 * Determine the number of ACPI name "segments" by counting the number of
 	 * path separators within the string. Start with one segment since the
 	 * segment count is [(# separators) + 1], and zero separators is ok.
 	 */
 	if (*next_external_char) {
 		info->num_segments = 1;
 		for (i = 0; next_external_char[i]; i++) {
 			if (ACPI_IS_PATH_SEPARATOR(next_external_char[i])) {
 				info->num_segments++;
 			}
 		}
 	}

 	info->length = (ACPI_NAME_SIZE * info->num_segments) +
 	    4 + info->num_carats;

 	info->next_external_char = next_external_char;
 }

 /*******************************************************************************
  *
  * FUNCTION:    acpi_ns_build_internal_name
  *
  * PARAMETERS:  info            - Info struct fully initialized
  *
  * RETURN:      Status
  *
  * DESCRIPTION: Construct the internal (AML) namestring
  *              corresponding to the external (ASL) namestring.
  *
  ******************************************************************************/

 acpi_status acpi_ns_build_internal_name(struct acpi_namestring_info *info)
 {
 	u32 num_segments = info->num_segments;
 	char *internal_name = info->internal_name;
 	const char *external_name = info->next_external_char;
 	char *result = NULL;
 	u32 i;

 	ACPI_FUNCTION_TRACE(ns_build_internal_name);

 	/* Setup the correct prefixes, counts, and pointers */

 	if (info->fully_qualified) {
 		internal_name[0] = AML_ROOT_PREFIX;

 		if (num_segments <= 1) {
 			result = &internal_name[1];
 		} else if (num_segments == 2) {
 			internal_name[1] = AML_DUAL_NAME_PREFIX;
 			result = &internal_name[2];
 		} else {
 			internal_name[1] = AML_MULTI_NAME_PREFIX_OP;
 			internal_name[2] = (char)num_segments;
 			result = &internal_name[3];
 		}
 	} else {
 		/*
 		 * Not fully qualified.
 		 * Handle Carats first, then append the name segments
 		 */
 		i = 0;
 		if (info->num_carats) {
 			for (i = 0; i < info->num_carats; i++) {
 				internal_name[i] = AML_PARENT_PREFIX;
 			}
 		}

 		if (num_segments <= 1) {
 			result = &internal_name[i];
 		} else if (num_segments == 2) {
 			internal_name[i] = AML_DUAL_NAME_PREFIX;
 			result = &internal_name[(acpi_size) i + 1];
 		} else {
 			internal_name[i] = AML_MULTI_NAME_PREFIX_OP;
 			internal_name[(acpi_size) i + 1] = (char)num_segments;
 			result = &internal_name[(acpi_size) i + 2];
 		}
 	}

 	/* Build the name (minus path separators) */

 	for (; num_segments; num_segments--) {
 		for (i = 0; i < ACPI_NAME_SIZE; i++) {
 			if (ACPI_IS_PATH_SEPARATOR(*external_name) ||
 			    (*external_name == 0)) {

 				/* Pad the segment with underscore(s) if segment is short */

 				result[i] = '_';
 			} else {
 				/* Convert the character to uppercase and save it */

 				result[i] =
 				    (char)ACPI_TOUPPER((int)*external_name);
 				external_name++;
 			}
 		}

 		/* Now we must have a path separator, or the pathname is bad */

 		if (!ACPI_IS_PATH_SEPARATOR(*external_name) &&
 		    (*external_name != 0)) {
 			return_ACPI_STATUS(AE_BAD_PATHNAME);
 		}

 		/* Move on the next segment */

 		external_name++;
 		result += ACPI_NAME_SIZE;
 	}

 	/* Terminate the string */

 	*result = 0;

 	if (info->fully_qualified) {
 		ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 				  "Returning [%p] (abs) \"\\%s\"\n",
 				  internal_name, internal_name));
 	} else {
 		ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Returning [%p] (rel) \"%s\"\n",
 				  internal_name, internal_name));
 	}

 	return_ACPI_STATUS(AE_OK);
 }

 /*******************************************************************************
  *
  * FUNCTION:    acpi_ns_internalize_name
  *
  * PARAMETERS:  *external_name          - External representation of name
  *              **Converted name        - Where to return the resulting
  *                                        internal represention of the name
  *
  * RETURN:      Status
  *
  * DESCRIPTION: Convert an external representation (e.g. "\_PR_.CPU0")
  *              to internal form (e.g. 5c 2f 02 5f 50 52 5f 43 50 55 30)
  *
  *******************************************************************************/

 acpi_status
 acpi_ns_internalize_name(const char *external_name, char **converted_name)
 {
 	char *internal_name;
 	struct acpi_namestring_info info;
 	acpi_status status;

 	ACPI_FUNCTION_TRACE(ns_internalize_name);

 	if ((!external_name) || (*external_name == 0) || (!converted_name)) {
 		return_ACPI_STATUS(AE_BAD_PARAMETER);
 	}

 	/* Get the length of the new internal name */

 	info.external_name = external_name;
 	acpi_ns_get_internal_name_length(&info);

 	/* We need a segment to store the internal  name */

 	internal_name = ACPI_ALLOCATE_ZEROED(info.length);
 	if (!internal_name) {
 		return_ACPI_STATUS(AE_NO_MEMORY);
 	}

 	/* Build the name */

 	info.internal_name = internal_name;
 	status = acpi_ns_build_internal_name(&info);
 	if (ACPI_FAILURE(status)) {
 		ACPI_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,
 			 const char *internal_name,
 			 u32 * converted_name_length, char **converted_name)
 {
 	u32 names_index = 0;
 	u32 num_segments = 0;
 	u32 required_length;
 	u32 prefix_length = 0;
 	u32 i = 0;
 	u32 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 AML_ROOT_PREFIX:
 		prefix_length = 1;
 		break;

 	case AML_PARENT_PREFIX:
 		for (i = 0; i < internal_name_length; i++) {
 			if (ACPI_IS_PARENT_PREFIX(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 = (u8)
 			    internal_name[(acpi_size) 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_ERROR((AE_INFO, "Invalid internal name"));
 		return_ACPI_STATUS(AE_BAD_PATHNAME);
 	}

 	/* Build the converted_name */

 	*converted_name = ACPI_ALLOCATE_ZEROED(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++] = '.';
 			}

 			/* Copy and validate the 4-char name segment */

 			ACPI_MOVE_NAME(&(*converted_name)[j],
 				       &internal_name[names_index]);
 			acpi_ut_repair_name(&(*converted_name)[j]);

 			j += ACPI_NAME_SIZE;
 			names_index += ACPI_NAME_SIZE;
 		}
 	}

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

 	return_ACPI_STATUS(AE_OK);
 }

 /*******************************************************************************
  *
  * FUNCTION:    acpi_ns_validate_handle
  *
  * PARAMETERS:  handle          - Handle to be validated and typecast to a
  *                                namespace node.
  *
  * RETURN:      A pointer to a namespace node
  *
  * DESCRIPTION: Convert a namespace handle to a namespace node. Handles special
  *              cases for the root node.
  *
  * NOTE: Real integer handles would allow for more verification
  *       and keep all pointers within this subsystem - however this introduces
  *       more overhead and has not been necessary to this point. Drivers
  *       holding handles are typically notified before a node becomes invalid
  *       due to a table unload.
  *
  ******************************************************************************/

 struct acpi_namespace_node *acpi_ns_validate_handle(acpi_handle handle)
 {

 	ACPI_FUNCTION_ENTRY();

 	/* Parameter validation */

 	if ((!handle) || (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 (ACPI_CAST_PTR(struct acpi_namespace_node, handle));
 }

 /*******************************************************************************
  *
  * 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"));
 	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_ENTRY();

 	if (type > ACPI_TYPE_LOCAL_MAX) {

 		/* type code out of range  */

 		ACPI_WARNING((AE_INFO, "Invalid Object Type 0x%X", type));
 		return (ACPI_NS_NORMAL);
 	}

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

 /*******************************************************************************
  *
  * FUNCTION:    acpi_ns_get_node
  *
  * PARAMETERS:  *pathname   - Name to be found, in external (ASL) format. The
  *                            \ (backslash) and ^ (carat) prefixes, and the
  *                            . (period) to separate segments are supported.
  *              prefix_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(struct acpi_namespace_node *prefix_node,
 		 const char *pathname,
 		 u32 flags, struct acpi_namespace_node **return_node)
 {
 	union acpi_generic_state scope_info;
 	acpi_status status;
 	char *internal_path;

 	ACPI_FUNCTION_TRACE_PTR(ns_get_node, ACPI_CAST_PTR(char, pathname));

 	/* Simplest case is a null pathname */

 	if (!pathname) {
 		*return_node = prefix_node;
 		if (!prefix_node) {
 			*return_node = acpi_gbl_root_node;
 		}
 		return_ACPI_STATUS(AE_OK);
 	}

 	/* Quick check for a reference to the root */

 	if (ACPI_IS_ROOT_PREFIX(pathname[0]) && (!pathname[1])) {
 		*return_node = acpi_gbl_root_node;
 		return_ACPI_STATUS(AE_OK);
 	}

 	/* 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 = prefix_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_EXEC, "%s, %s\n",
 				  pathname, acpi_format_exception(status)));
 	}

 	(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);

       cleanup:
 	ACPI_FREE(internal_path);
 	return_ACPI_STATUS(status);
 }
	/******************************************************************************
	*
	* Module Name: nsutils - Utilities for accessing ACPI namespace, accessing
	* parents and siblings and Scope manipulation
	*
	*****************************************************************************/

	/*
	* Copyright (C) 2000 - 2013, Intel Corp.
	* All rights reserved.
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions
	* are met:
	* 1. Redistributions of source code must retain the above copyright
	* notice, this list of conditions, and the following disclaimer,
	* without modification.
	* 2. Redistributions in binary form must reproduce at minimum a disclaimer
	* substantially similar to the "NO WARRANTY" disclaimer below
	* ("Disclaimer") and any redistribution must be conditioned upon
	* including a substantially similar Disclaimer requirement for further
	* binary redistribution.
	* 3. Neither the names of the above-listed copyright holders nor the names
	* of any contributors may be used to endorse or promote products derived
	* from this software without specific prior written permission.
	*
	* Alternatively, this software may be distributed under the terms of the
	* GNU General Public License ("GPL") version 2 as published by the Free
	* Software Foundation.
	*
	* NO WARRANTY
	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
	* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
	* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
	* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
	* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
	* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
	* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
	* POSSIBILITY OF SUCH DAMAGES.
	*/

	#include <acpi/acpi.h>
	#include "accommon.h"
	#include "acnamesp.h"
	#include "amlcode.h"

	#define _COMPONENT ACPI_NAMESPACE
	ACPI_MODULE_NAME("nsutils")

	/* Local prototypes */
	#ifdef ACPI_OBSOLETE_FUNCTIONS
	acpi_name acpi_ns_find_parent_name(struct acpi_namespace_node *node_to_search);
	#endif

	/*******************************************************************************
	*
	* FUNCTION: acpi_ns_print_node_pathname
	*
	* PARAMETERS: node - Object
	* message - Prefix message
	*
	* DESCRIPTION: Print an object's full namespace pathname
	* Manages allocation/freeing of a pathname buffer
	*
	******************************************************************************/

	void
	acpi_ns_print_node_pathname(struct acpi_namespace_node *node,
	const char *message)
	{
	struct acpi_buffer buffer;
	acpi_status status;

	if (!node) {
	acpi_os_printf("[NULL NAME]");
	return;
	}

	/* Convert handle to full pathname and print it (with supplied message) */

	buffer.length = ACPI_ALLOCATE_LOCAL_BUFFER;

	status = acpi_ns_handle_to_pathname(node, &buffer);
	if (ACPI_SUCCESS(status)) {
	if (message) {
	acpi_os_printf("%s ", message);
	}

	acpi_os_printf("[%s] (Node %p)", (char *)buffer.pointer, node);
	ACPI_FREE(buffer.pointer);
	}
	}

	/*******************************************************************************
	*
	* FUNCTION: acpi_ns_get_type
	*
	* PARAMETERS: node - Parent Node to be examined
	*
	* RETURN: Type field from Node whose handle is passed
	*
	* DESCRIPTION: Return the type of a Namespace node
	*
	******************************************************************************/

	acpi_object_type acpi_ns_get_type(struct acpi_namespace_node * node)
	{
	ACPI_FUNCTION_TRACE(ns_get_type);

	if (!node) {
	ACPI_WARNING((AE_INFO, "Null Node parameter"));
	return_UINT8(ACPI_TYPE_ANY);
	}

	return_UINT8(node->type);
	}

	/*******************************************************************************
	*
	* FUNCTION: acpi_ns_local
	*
	* PARAMETERS: type - A namespace object type
	*
	* RETURN: LOCAL if names must be found locally in objects of the
	* passed type, 0 if enclosing scopes should be searched
	*
	* DESCRIPTION: Returns scope rule for the given object type.
	*
	******************************************************************************/

	u32 acpi_ns_local(acpi_object_type type)
	{
	ACPI_FUNCTION_TRACE(ns_local);

	if (!acpi_ut_valid_object_type(type)) {

	/* Type code out of range */

	ACPI_WARNING((AE_INFO, "Invalid Object Type 0x%X", type));
	return_UINT32(ACPI_NS_NORMAL);
	}

	return_UINT32(acpi_gbl_ns_properties[type] & ACPI_NS_LOCAL);
	}

	/*******************************************************************************
	*
	* FUNCTION: acpi_ns_get_internal_name_length
	*
	* PARAMETERS: info - Info struct initialized with the
	* external name pointer.
	*
	* RETURN: None
	*
	* DESCRIPTION: Calculate the length of the internal (AML) namestring
	* corresponding to the external (ASL) namestring.
	*
	******************************************************************************/

	void acpi_ns_get_internal_name_length(struct acpi_namestring_info *info)
	{
	const char *next_external_char;
	u32 i;

	ACPI_FUNCTION_ENTRY();

	next_external_char = info->external_name;
	info->num_carats = 0;
	info->num_segments = 0;
	info->fully_qualified = FALSE;

	/*
	* For the internal name, the required length is 4 bytes per segment, plus
	* 1 each for root_prefix, multi_name_prefix_op, segment count, trailing null
	* (which is not really needed, but no there's harm in putting it there)
	*
	* strlen() + 1 covers the first name_seg, which has no path separator
	*/
	if (ACPI_IS_ROOT_PREFIX(*next_external_char)) {
	info->fully_qualified = TRUE;
	next_external_char++;

	/* Skip redundant root_prefix, like \\_SB.PCI0.SBRG.EC0 */

	while (ACPI_IS_ROOT_PREFIX(*next_external_char)) {
	next_external_char++;
	}
	} else {
	/* Handle Carat prefixes */

	while (ACPI_IS_PARENT_PREFIX(*next_external_char)) {
	info->num_carats++;
	next_external_char++;
	}
	}

	/*
	* Determine the number of ACPI name "segments" by counting the number of
	* path separators within the string. Start with one segment since the
	* segment count is [(# separators) + 1], and zero separators is ok.
	*/
	if (*next_external_char) {
	info->num_segments = 1;
	for (i = 0; next_external_char[i]; i++) {
	if (ACPI_IS_PATH_SEPARATOR(next_external_char[i])) {
	info->num_segments++;
	}
	}
	}

	info->length = (ACPI_NAME_SIZE * info->num_segments) +
	4 + info->num_carats;

	info->next_external_char = next_external_char;
	}

	/*******************************************************************************
	*
	* FUNCTION: acpi_ns_build_internal_name
	*
	* PARAMETERS: info - Info struct fully initialized
	*
	* RETURN: Status
	*
	* DESCRIPTION: Construct the internal (AML) namestring
	* corresponding to the external (ASL) namestring.
	*
	******************************************************************************/

	acpi_status acpi_ns_build_internal_name(struct acpi_namestring_info *info)
	{
	u32 num_segments = info->num_segments;
	char *internal_name = info->internal_name;
	const char *external_name = info->next_external_char;
	char *result = NULL;
	u32 i;

	ACPI_FUNCTION_TRACE(ns_build_internal_name);

	/* Setup the correct prefixes, counts, and pointers */

	if (info->fully_qualified) {
	internal_name[0] = AML_ROOT_PREFIX;

	if (num_segments <= 1) {
	result = &internal_name[1];
	} else if (num_segments == 2) {
	internal_name[1] = AML_DUAL_NAME_PREFIX;
	result = &internal_name[2];
	} else {
	internal_name[1] = AML_MULTI_NAME_PREFIX_OP;
	internal_name[2] = (char)num_segments;
	result = &internal_name[3];
	}
	} else {
	/*
	* Not fully qualified.
	* Handle Carats first, then append the name segments
	*/
	i = 0;
	if (info->num_carats) {
	for (i = 0; i < info->num_carats; i++) {
	internal_name[i] = AML_PARENT_PREFIX;
	}
	}

	if (num_segments <= 1) {
	result = &internal_name[i];
	} else if (num_segments == 2) {
	internal_name[i] = AML_DUAL_NAME_PREFIX;
	result = &internal_name[(acpi_size) i + 1];
	} else {
	internal_name[i] = AML_MULTI_NAME_PREFIX_OP;
	internal_name[(acpi_size) i + 1] = (char)num_segments;
	result = &internal_name[(acpi_size) i + 2];
	}
	}

	/* Build the name (minus path separators) */

	for (; num_segments; num_segments--) {
	for (i = 0; i < ACPI_NAME_SIZE; i++) {
	if (ACPI_IS_PATH_SEPARATOR(*external_name) \|\|
	(*external_name == 0)) {

	/* Pad the segment with underscore(s) if segment is short */

	result[i] = '_';
	} else {
	/* Convert the character to uppercase and save it */

	result[i] =
	(char)ACPI_TOUPPER((int)*external_name);
	external_name++;
	}
	}

	/* Now we must have a path separator, or the pathname is bad */

	if (!ACPI_IS_PATH_SEPARATOR(*external_name) &&
	(*external_name != 0)) {
	return_ACPI_STATUS(AE_BAD_PATHNAME);
	}

	/* Move on the next segment */

	external_name++;
	result += ACPI_NAME_SIZE;
	}

	/* Terminate the string */

	*result = 0;

	if (info->fully_qualified) {
	ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
	"Returning [%p] (abs) \"\\%s\"\n",
	internal_name, internal_name));
	} else {
	ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Returning [%p] (rel) \"%s\"\n",
	internal_name, internal_name));
	}

	return_ACPI_STATUS(AE_OK);
	}

	/*******************************************************************************
	*
	* FUNCTION: acpi_ns_internalize_name
	*
	* PARAMETERS: *external_name - External representation of name
	* **Converted name - Where to return the resulting
	* internal represention of the name
	*
	* RETURN: Status
	*
	* DESCRIPTION: Convert an external representation (e.g. "\_PR_.CPU0")
	* to internal form (e.g. 5c 2f 02 5f 50 52 5f 43 50 55 30)
	*
	*******************************************************************************/

	acpi_status
	acpi_ns_internalize_name(const char external_name, char *converted_name)
	{
	char *internal_name;
	struct acpi_namestring_info info;
	acpi_status status;

	ACPI_FUNCTION_TRACE(ns_internalize_name);

	if ((!external_name) \|\| (*external_name == 0) \|\| (!converted_name)) {
	return_ACPI_STATUS(AE_BAD_PARAMETER);
	}

	/* Get the length of the new internal name */

	info.external_name = external_name;
	acpi_ns_get_internal_name_length(&info);

	/* We need a segment to store the internal name */

	internal_name = ACPI_ALLOCATE_ZEROED(info.length);
	if (!internal_name) {
	return_ACPI_STATUS(AE_NO_MEMORY);
	}

	/* Build the name */

	info.internal_name = internal_name;
	status = acpi_ns_build_internal_name(&info);
	if (ACPI_FAILURE(status)) {
	ACPI_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,
	const char *internal_name,
	u32 * converted_name_length, char **converted_name)
	{
	u32 names_index = 0;
	u32 num_segments = 0;
	u32 required_length;
	u32 prefix_length = 0;
	u32 i = 0;
	u32 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 AML_ROOT_PREFIX:
	prefix_length = 1;
	break;

	case AML_PARENT_PREFIX:
	for (i = 0; i < internal_name_length; i++) {
	if (ACPI_IS_PARENT_PREFIX(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 = (u8)
	internal_name[(acpi_size) 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_ERROR((AE_INFO, "Invalid internal name"));
	return_ACPI_STATUS(AE_BAD_PATHNAME);
	}

	/* Build the converted_name */

	*converted_name = ACPI_ALLOCATE_ZEROED(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++] = '.';
	}

	/* Copy and validate the 4-char name segment */

	ACPI_MOVE_NAME(&(*converted_name)[j],
	&internal_name[names_index]);
	acpi_ut_repair_name(&(*converted_name)[j]);

	j += ACPI_NAME_SIZE;
	names_index += ACPI_NAME_SIZE;
	}
	}

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

	return_ACPI_STATUS(AE_OK);
	}

	/*******************************************************************************
	*
	* FUNCTION: acpi_ns_validate_handle
	*
	* PARAMETERS: handle - Handle to be validated and typecast to a
	* namespace node.
	*
	* RETURN: A pointer to a namespace node
	*
	* DESCRIPTION: Convert a namespace handle to a namespace node. Handles special
	* cases for the root node.
	*
	* NOTE: Real integer handles would allow for more verification
	* and keep all pointers within this subsystem - however this introduces
	* more overhead and has not been necessary to this point. Drivers
	* holding handles are typically notified before a node becomes invalid
	* due to a table unload.
	*
	******************************************************************************/

	struct acpi_namespace_node *acpi_ns_validate_handle(acpi_handle handle)
	{

	ACPI_FUNCTION_ENTRY();

	/* Parameter validation */

	if ((!handle) \|\| (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 (ACPI_CAST_PTR(struct acpi_namespace_node, handle));
	}

	/*******************************************************************************
	*
	* 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"));
	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_ENTRY();

	if (type > ACPI_TYPE_LOCAL_MAX) {

	/* type code out of range */

	ACPI_WARNING((AE_INFO, "Invalid Object Type 0x%X", type));
	return (ACPI_NS_NORMAL);
	}

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

	/*******************************************************************************
	*
	* FUNCTION: acpi_ns_get_node
	*
	* PARAMETERS: *pathname - Name to be found, in external (ASL) format. The
	* \ (backslash) and ^ (carat) prefixes, and the
	* . (period) to separate segments are supported.
	* prefix_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(struct acpi_namespace_node *prefix_node,
	const char *pathname,
	u32 flags, struct acpi_namespace_node **return_node)
	{
	union acpi_generic_state scope_info;
	acpi_status status;
	char *internal_path;

	ACPI_FUNCTION_TRACE_PTR(ns_get_node, ACPI_CAST_PTR(char, pathname));

	/* Simplest case is a null pathname */

	if (!pathname) {
	*return_node = prefix_node;
	if (!prefix_node) {
	*return_node = acpi_gbl_root_node;
	}
	return_ACPI_STATUS(AE_OK);
	}

	/* Quick check for a reference to the root */

	if (ACPI_IS_ROOT_PREFIX(pathname[0]) && (!pathname[1])) {
	*return_node = acpi_gbl_root_node;
	return_ACPI_STATUS(AE_OK);
	}

	/* 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 = prefix_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_EXEC, "%s, %s\n",
	pathname, acpi_format_exception(status)));
	}

	(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);

	cleanup:
	ACPI_FREE(internal_path);
	return_ACPI_STATUS(status);
	}