xref: /openbmc/linux/drivers/acpi/acpica/nsutils.c (revision b6dcefde)
1 /******************************************************************************
2  *
3  * Module Name: nsutils - Utilities for accessing ACPI namespace, accessing
4  *                        parents and siblings and Scope manipulation
5  *
6  *****************************************************************************/
7 
8 /*
9  * Copyright (C) 2000 - 2008, Intel Corp.
10  * All rights reserved.
11  *
12  * Redistribution and use in source and binary forms, with or without
13  * modification, are permitted provided that the following conditions
14  * are met:
15  * 1. Redistributions of source code must retain the above copyright
16  *    notice, this list of conditions, and the following disclaimer,
17  *    without modification.
18  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
19  *    substantially similar to the "NO WARRANTY" disclaimer below
20  *    ("Disclaimer") and any redistribution must be conditioned upon
21  *    including a substantially similar Disclaimer requirement for further
22  *    binary redistribution.
23  * 3. Neither the names of the above-listed copyright holders nor the names
24  *    of any contributors may be used to endorse or promote products derived
25  *    from this software without specific prior written permission.
26  *
27  * Alternatively, this software may be distributed under the terms of the
28  * GNU General Public License ("GPL") version 2 as published by the Free
29  * Software Foundation.
30  *
31  * NO WARRANTY
32  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
33  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
34  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
35  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
36  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
37  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
38  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
39  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
40  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
41  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
42  * POSSIBILITY OF SUCH DAMAGES.
43  */
44 
45 #include <acpi/acpi.h>
46 #include "accommon.h"
47 #include "acnamesp.h"
48 #include "amlcode.h"
49 #include "actables.h"
50 
51 #define _COMPONENT          ACPI_NAMESPACE
52 ACPI_MODULE_NAME("nsutils")
53 
54 /* Local prototypes */
55 static u8 acpi_ns_valid_path_separator(char sep);
56 
57 #ifdef ACPI_OBSOLETE_FUNCTIONS
58 acpi_name acpi_ns_find_parent_name(struct acpi_namespace_node *node_to_search);
59 #endif
60 
61 /*******************************************************************************
62  *
63  * FUNCTION:    acpi_ns_report_error
64  *
65  * PARAMETERS:  module_name         - Caller's module name (for error output)
66  *              line_number         - Caller's line number (for error output)
67  *              internal_name       - Name or path of the namespace node
68  *              lookup_status       - Exception code from NS lookup
69  *
70  * RETURN:      None
71  *
72  * DESCRIPTION: Print warning message with full pathname
73  *
74  ******************************************************************************/
75 
76 void
77 acpi_ns_report_error(const char *module_name,
78 		     u32 line_number,
79 		     const char *internal_name, acpi_status lookup_status)
80 {
81 	acpi_status status;
82 	u32 bad_name;
83 	char *name = NULL;
84 
85 	acpi_os_printf("ACPI Error (%s-%04d): ", module_name, line_number);
86 
87 	if (lookup_status == AE_BAD_CHARACTER) {
88 
89 		/* There is a non-ascii character in the name */
90 
91 		ACPI_MOVE_32_TO_32(&bad_name,
92 				   ACPI_CAST_PTR(u32, internal_name));
93 		acpi_os_printf("[0x%4.4X] (NON-ASCII)", bad_name);
94 	} else {
95 		/* Convert path to external format */
96 
97 		status = acpi_ns_externalize_name(ACPI_UINT32_MAX,
98 						  internal_name, NULL, &name);
99 
100 		/* Print target name */
101 
102 		if (ACPI_SUCCESS(status)) {
103 			acpi_os_printf("[%s]", name);
104 		} else {
105 			acpi_os_printf("[COULD NOT EXTERNALIZE NAME]");
106 		}
107 
108 		if (name) {
109 			ACPI_FREE(name);
110 		}
111 	}
112 
113 	acpi_os_printf(" Namespace lookup failure, %s\n",
114 		       acpi_format_exception(lookup_status));
115 }
116 
117 /*******************************************************************************
118  *
119  * FUNCTION:    acpi_ns_report_method_error
120  *
121  * PARAMETERS:  module_name         - Caller's module name (for error output)
122  *              line_number         - Caller's line number (for error output)
123  *              Message             - Error message to use on failure
124  *              prefix_node         - Prefix relative to the path
125  *              Path                - Path to the node (optional)
126  *              method_status       - Execution status
127  *
128  * RETURN:      None
129  *
130  * DESCRIPTION: Print warning message with full pathname
131  *
132  ******************************************************************************/
133 
134 void
135 acpi_ns_report_method_error(const char *module_name,
136 			    u32 line_number,
137 			    const char *message,
138 			    struct acpi_namespace_node *prefix_node,
139 			    const char *path, acpi_status method_status)
140 {
141 	acpi_status status;
142 	struct acpi_namespace_node *node = prefix_node;
143 
144 	acpi_os_printf("ACPI Error (%s-%04d): ", module_name, line_number);
145 
146 	if (path) {
147 		status =
148 		    acpi_ns_get_node(prefix_node, path, ACPI_NS_NO_UPSEARCH,
149 				     &node);
150 		if (ACPI_FAILURE(status)) {
151 			acpi_os_printf("[Could not get node by pathname]");
152 		}
153 	}
154 
155 	acpi_ns_print_node_pathname(node, message);
156 	acpi_os_printf(", %s\n", acpi_format_exception(method_status));
157 }
158 
159 /*******************************************************************************
160  *
161  * FUNCTION:    acpi_ns_print_node_pathname
162  *
163  * PARAMETERS:  Node            - Object
164  *              Message         - Prefix message
165  *
166  * DESCRIPTION: Print an object's full namespace pathname
167  *              Manages allocation/freeing of a pathname buffer
168  *
169  ******************************************************************************/
170 
171 void
172 acpi_ns_print_node_pathname(struct acpi_namespace_node *node,
173 			    const char *message)
174 {
175 	struct acpi_buffer buffer;
176 	acpi_status status;
177 
178 	if (!node) {
179 		acpi_os_printf("[NULL NAME]");
180 		return;
181 	}
182 
183 	/* Convert handle to full pathname and print it (with supplied message) */
184 
185 	buffer.length = ACPI_ALLOCATE_LOCAL_BUFFER;
186 
187 	status = acpi_ns_handle_to_pathname(node, &buffer);
188 	if (ACPI_SUCCESS(status)) {
189 		if (message) {
190 			acpi_os_printf("%s ", message);
191 		}
192 
193 		acpi_os_printf("[%s] (Node %p)", (char *)buffer.pointer, node);
194 		ACPI_FREE(buffer.pointer);
195 	}
196 }
197 
198 /*******************************************************************************
199  *
200  * FUNCTION:    acpi_ns_valid_root_prefix
201  *
202  * PARAMETERS:  Prefix          - Character to be checked
203  *
204  * RETURN:      TRUE if a valid prefix
205  *
206  * DESCRIPTION: Check if a character is a valid ACPI Root prefix
207  *
208  ******************************************************************************/
209 
210 u8 acpi_ns_valid_root_prefix(char prefix)
211 {
212 
213 	return ((u8) (prefix == '\\'));
214 }
215 
216 /*******************************************************************************
217  *
218  * FUNCTION:    acpi_ns_valid_path_separator
219  *
220  * PARAMETERS:  Sep         - Character to be checked
221  *
222  * RETURN:      TRUE if a valid path separator
223  *
224  * DESCRIPTION: Check if a character is a valid ACPI path separator
225  *
226  ******************************************************************************/
227 
228 static u8 acpi_ns_valid_path_separator(char sep)
229 {
230 
231 	return ((u8) (sep == '.'));
232 }
233 
234 /*******************************************************************************
235  *
236  * FUNCTION:    acpi_ns_get_type
237  *
238  * PARAMETERS:  Node        - Parent Node to be examined
239  *
240  * RETURN:      Type field from Node whose handle is passed
241  *
242  * DESCRIPTION: Return the type of a Namespace node
243  *
244  ******************************************************************************/
245 
246 acpi_object_type acpi_ns_get_type(struct acpi_namespace_node * node)
247 {
248 	ACPI_FUNCTION_TRACE(ns_get_type);
249 
250 	if (!node) {
251 		ACPI_WARNING((AE_INFO, "Null Node parameter"));
252 		return_UINT32(ACPI_TYPE_ANY);
253 	}
254 
255 	return_UINT32((acpi_object_type) node->type);
256 }
257 
258 /*******************************************************************************
259  *
260  * FUNCTION:    acpi_ns_local
261  *
262  * PARAMETERS:  Type        - A namespace object type
263  *
264  * RETURN:      LOCAL if names must be found locally in objects of the
265  *              passed type, 0 if enclosing scopes should be searched
266  *
267  * DESCRIPTION: Returns scope rule for the given object type.
268  *
269  ******************************************************************************/
270 
271 u32 acpi_ns_local(acpi_object_type type)
272 {
273 	ACPI_FUNCTION_TRACE(ns_local);
274 
275 	if (!acpi_ut_valid_object_type(type)) {
276 
277 		/* Type code out of range  */
278 
279 		ACPI_WARNING((AE_INFO, "Invalid Object Type %X", type));
280 		return_UINT32(ACPI_NS_NORMAL);
281 	}
282 
283 	return_UINT32((u32) acpi_gbl_ns_properties[type] & ACPI_NS_LOCAL);
284 }
285 
286 /*******************************************************************************
287  *
288  * FUNCTION:    acpi_ns_get_internal_name_length
289  *
290  * PARAMETERS:  Info            - Info struct initialized with the
291  *                                external name pointer.
292  *
293  * RETURN:      None
294  *
295  * DESCRIPTION: Calculate the length of the internal (AML) namestring
296  *              corresponding to the external (ASL) namestring.
297  *
298  ******************************************************************************/
299 
300 void acpi_ns_get_internal_name_length(struct acpi_namestring_info *info)
301 {
302 	const char *next_external_char;
303 	u32 i;
304 
305 	ACPI_FUNCTION_ENTRY();
306 
307 	next_external_char = info->external_name;
308 	info->num_carats = 0;
309 	info->num_segments = 0;
310 	info->fully_qualified = FALSE;
311 
312 	/*
313 	 * For the internal name, the required length is 4 bytes per segment, plus
314 	 * 1 each for root_prefix, multi_name_prefix_op, segment count, trailing null
315 	 * (which is not really needed, but no there's harm in putting it there)
316 	 *
317 	 * strlen() + 1 covers the first name_seg, which has no path separator
318 	 */
319 	if (acpi_ns_valid_root_prefix(*next_external_char)) {
320 		info->fully_qualified = TRUE;
321 		next_external_char++;
322 
323 		/* Skip redundant root_prefix, like \\_SB.PCI0.SBRG.EC0 */
324 
325 		while (acpi_ns_valid_root_prefix(*next_external_char)) {
326 			next_external_char++;
327 		}
328 	} else {
329 		/* Handle Carat prefixes */
330 
331 		while (*next_external_char == '^') {
332 			info->num_carats++;
333 			next_external_char++;
334 		}
335 	}
336 
337 	/*
338 	 * Determine the number of ACPI name "segments" by counting the number of
339 	 * path separators within the string. Start with one segment since the
340 	 * segment count is [(# separators) + 1], and zero separators is ok.
341 	 */
342 	if (*next_external_char) {
343 		info->num_segments = 1;
344 		for (i = 0; next_external_char[i]; i++) {
345 			if (acpi_ns_valid_path_separator(next_external_char[i])) {
346 				info->num_segments++;
347 			}
348 		}
349 	}
350 
351 	info->length = (ACPI_NAME_SIZE * info->num_segments) +
352 	    4 + info->num_carats;
353 
354 	info->next_external_char = next_external_char;
355 }
356 
357 /*******************************************************************************
358  *
359  * FUNCTION:    acpi_ns_build_internal_name
360  *
361  * PARAMETERS:  Info            - Info struct fully initialized
362  *
363  * RETURN:      Status
364  *
365  * DESCRIPTION: Construct the internal (AML) namestring
366  *              corresponding to the external (ASL) namestring.
367  *
368  ******************************************************************************/
369 
370 acpi_status acpi_ns_build_internal_name(struct acpi_namestring_info *info)
371 {
372 	u32 num_segments = info->num_segments;
373 	char *internal_name = info->internal_name;
374 	const char *external_name = info->next_external_char;
375 	char *result = NULL;
376 	u32 i;
377 
378 	ACPI_FUNCTION_TRACE(ns_build_internal_name);
379 
380 	/* Setup the correct prefixes, counts, and pointers */
381 
382 	if (info->fully_qualified) {
383 		internal_name[0] = '\\';
384 
385 		if (num_segments <= 1) {
386 			result = &internal_name[1];
387 		} else if (num_segments == 2) {
388 			internal_name[1] = AML_DUAL_NAME_PREFIX;
389 			result = &internal_name[2];
390 		} else {
391 			internal_name[1] = AML_MULTI_NAME_PREFIX_OP;
392 			internal_name[2] = (char)num_segments;
393 			result = &internal_name[3];
394 		}
395 	} else {
396 		/*
397 		 * Not fully qualified.
398 		 * Handle Carats first, then append the name segments
399 		 */
400 		i = 0;
401 		if (info->num_carats) {
402 			for (i = 0; i < info->num_carats; i++) {
403 				internal_name[i] = '^';
404 			}
405 		}
406 
407 		if (num_segments <= 1) {
408 			result = &internal_name[i];
409 		} else if (num_segments == 2) {
410 			internal_name[i] = AML_DUAL_NAME_PREFIX;
411 			result = &internal_name[(acpi_size) i + 1];
412 		} else {
413 			internal_name[i] = AML_MULTI_NAME_PREFIX_OP;
414 			internal_name[(acpi_size) i + 1] = (char)num_segments;
415 			result = &internal_name[(acpi_size) i + 2];
416 		}
417 	}
418 
419 	/* Build the name (minus path separators) */
420 
421 	for (; num_segments; num_segments--) {
422 		for (i = 0; i < ACPI_NAME_SIZE; i++) {
423 			if (acpi_ns_valid_path_separator(*external_name) ||
424 			    (*external_name == 0)) {
425 
426 				/* Pad the segment with underscore(s) if segment is short */
427 
428 				result[i] = '_';
429 			} else {
430 				/* Convert the character to uppercase and save it */
431 
432 				result[i] =
433 				    (char)ACPI_TOUPPER((int)*external_name);
434 				external_name++;
435 			}
436 		}
437 
438 		/* Now we must have a path separator, or the pathname is bad */
439 
440 		if (!acpi_ns_valid_path_separator(*external_name) &&
441 		    (*external_name != 0)) {
442 			return_ACPI_STATUS(AE_BAD_PARAMETER);
443 		}
444 
445 		/* Move on the next segment */
446 
447 		external_name++;
448 		result += ACPI_NAME_SIZE;
449 	}
450 
451 	/* Terminate the string */
452 
453 	*result = 0;
454 
455 	if (info->fully_qualified) {
456 		ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
457 				  "Returning [%p] (abs) \"\\%s\"\n",
458 				  internal_name, internal_name));
459 	} else {
460 		ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Returning [%p] (rel) \"%s\"\n",
461 				  internal_name, internal_name));
462 	}
463 
464 	return_ACPI_STATUS(AE_OK);
465 }
466 
467 /*******************************************************************************
468  *
469  * FUNCTION:    acpi_ns_internalize_name
470  *
471  * PARAMETERS:  *external_name          - External representation of name
472  *              **Converted Name        - Where to return the resulting
473  *                                        internal represention of the name
474  *
475  * RETURN:      Status
476  *
477  * DESCRIPTION: Convert an external representation (e.g. "\_PR_.CPU0")
478  *              to internal form (e.g. 5c 2f 02 5f 50 52 5f 43 50 55 30)
479  *
480  *******************************************************************************/
481 
482 acpi_status
483 acpi_ns_internalize_name(const char *external_name, char **converted_name)
484 {
485 	char *internal_name;
486 	struct acpi_namestring_info info;
487 	acpi_status status;
488 
489 	ACPI_FUNCTION_TRACE(ns_internalize_name);
490 
491 	if ((!external_name) || (*external_name == 0) || (!converted_name)) {
492 		return_ACPI_STATUS(AE_BAD_PARAMETER);
493 	}
494 
495 	/* Get the length of the new internal name */
496 
497 	info.external_name = external_name;
498 	acpi_ns_get_internal_name_length(&info);
499 
500 	/* We need a segment to store the internal  name */
501 
502 	internal_name = ACPI_ALLOCATE_ZEROED(info.length);
503 	if (!internal_name) {
504 		return_ACPI_STATUS(AE_NO_MEMORY);
505 	}
506 
507 	/* Build the name */
508 
509 	info.internal_name = internal_name;
510 	status = acpi_ns_build_internal_name(&info);
511 	if (ACPI_FAILURE(status)) {
512 		ACPI_FREE(internal_name);
513 		return_ACPI_STATUS(status);
514 	}
515 
516 	*converted_name = internal_name;
517 	return_ACPI_STATUS(AE_OK);
518 }
519 
520 /*******************************************************************************
521  *
522  * FUNCTION:    acpi_ns_externalize_name
523  *
524  * PARAMETERS:  internal_name_length - Lenth of the internal name below
525  *              internal_name       - Internal representation of name
526  *              converted_name_length - Where the length is returned
527  *              converted_name      - Where the resulting external name
528  *                                    is returned
529  *
530  * RETURN:      Status
531  *
532  * DESCRIPTION: Convert internal name (e.g. 5c 2f 02 5f 50 52 5f 43 50 55 30)
533  *              to its external (printable) form (e.g. "\_PR_.CPU0")
534  *
535  ******************************************************************************/
536 
537 acpi_status
538 acpi_ns_externalize_name(u32 internal_name_length,
539 			 const char *internal_name,
540 			 u32 * converted_name_length, char **converted_name)
541 {
542 	u32 names_index = 0;
543 	u32 num_segments = 0;
544 	u32 required_length;
545 	u32 prefix_length = 0;
546 	u32 i = 0;
547 	u32 j = 0;
548 
549 	ACPI_FUNCTION_TRACE(ns_externalize_name);
550 
551 	if (!internal_name_length || !internal_name || !converted_name) {
552 		return_ACPI_STATUS(AE_BAD_PARAMETER);
553 	}
554 
555 	/* Check for a prefix (one '\' | one or more '^') */
556 
557 	switch (internal_name[0]) {
558 	case '\\':
559 		prefix_length = 1;
560 		break;
561 
562 	case '^':
563 		for (i = 0; i < internal_name_length; i++) {
564 			if (internal_name[i] == '^') {
565 				prefix_length = i + 1;
566 			} else {
567 				break;
568 			}
569 		}
570 
571 		if (i == internal_name_length) {
572 			prefix_length = i;
573 		}
574 
575 		break;
576 
577 	default:
578 		break;
579 	}
580 
581 	/*
582 	 * Check for object names. Note that there could be 0-255 of these
583 	 * 4-byte elements.
584 	 */
585 	if (prefix_length < internal_name_length) {
586 		switch (internal_name[prefix_length]) {
587 		case AML_MULTI_NAME_PREFIX_OP:
588 
589 			/* <count> 4-byte names */
590 
591 			names_index = prefix_length + 2;
592 			num_segments = (u8)
593 			    internal_name[(acpi_size) prefix_length + 1];
594 			break;
595 
596 		case AML_DUAL_NAME_PREFIX:
597 
598 			/* Two 4-byte names */
599 
600 			names_index = prefix_length + 1;
601 			num_segments = 2;
602 			break;
603 
604 		case 0:
605 
606 			/* null_name */
607 
608 			names_index = 0;
609 			num_segments = 0;
610 			break;
611 
612 		default:
613 
614 			/* one 4-byte name */
615 
616 			names_index = prefix_length;
617 			num_segments = 1;
618 			break;
619 		}
620 	}
621 
622 	/*
623 	 * Calculate the length of converted_name, which equals the length
624 	 * of the prefix, length of all object names, length of any required
625 	 * punctuation ('.') between object names, plus the NULL terminator.
626 	 */
627 	required_length = prefix_length + (4 * num_segments) +
628 	    ((num_segments > 0) ? (num_segments - 1) : 0) + 1;
629 
630 	/*
631 	 * Check to see if we're still in bounds.  If not, there's a problem
632 	 * with internal_name (invalid format).
633 	 */
634 	if (required_length > internal_name_length) {
635 		ACPI_ERROR((AE_INFO, "Invalid internal name"));
636 		return_ACPI_STATUS(AE_BAD_PATHNAME);
637 	}
638 
639 	/* Build the converted_name */
640 
641 	*converted_name = ACPI_ALLOCATE_ZEROED(required_length);
642 	if (!(*converted_name)) {
643 		return_ACPI_STATUS(AE_NO_MEMORY);
644 	}
645 
646 	j = 0;
647 
648 	for (i = 0; i < prefix_length; i++) {
649 		(*converted_name)[j++] = internal_name[i];
650 	}
651 
652 	if (num_segments > 0) {
653 		for (i = 0; i < num_segments; i++) {
654 			if (i > 0) {
655 				(*converted_name)[j++] = '.';
656 			}
657 
658 			(*converted_name)[j++] = internal_name[names_index++];
659 			(*converted_name)[j++] = internal_name[names_index++];
660 			(*converted_name)[j++] = internal_name[names_index++];
661 			(*converted_name)[j++] = internal_name[names_index++];
662 		}
663 	}
664 
665 	if (converted_name_length) {
666 		*converted_name_length = (u32) required_length;
667 	}
668 
669 	return_ACPI_STATUS(AE_OK);
670 }
671 
672 /*******************************************************************************
673  *
674  * FUNCTION:    acpi_ns_validate_handle
675  *
676  * PARAMETERS:  Handle          - Handle to be validated and typecast to a
677  *                                namespace node.
678  *
679  * RETURN:      A pointer to a namespace node
680  *
681  * DESCRIPTION: Convert a namespace handle to a namespace node. Handles special
682  *              cases for the root node.
683  *
684  * NOTE: Real integer handles would allow for more verification
685  *       and keep all pointers within this subsystem - however this introduces
686  *       more overhead and has not been necessary to this point. Drivers
687  *       holding handles are typically notified before a node becomes invalid
688  *       due to a table unload.
689  *
690  ******************************************************************************/
691 
692 struct acpi_namespace_node *acpi_ns_validate_handle(acpi_handle handle)
693 {
694 
695 	ACPI_FUNCTION_ENTRY();
696 
697 	/* Parameter validation */
698 
699 	if ((!handle) || (handle == ACPI_ROOT_OBJECT)) {
700 		return (acpi_gbl_root_node);
701 	}
702 
703 	/* We can at least attempt to verify the handle */
704 
705 	if (ACPI_GET_DESCRIPTOR_TYPE(handle) != ACPI_DESC_TYPE_NAMED) {
706 		return (NULL);
707 	}
708 
709 	return (ACPI_CAST_PTR(struct acpi_namespace_node, handle));
710 }
711 
712 /*******************************************************************************
713  *
714  * FUNCTION:    acpi_ns_terminate
715  *
716  * PARAMETERS:  none
717  *
718  * RETURN:      none
719  *
720  * DESCRIPTION: free memory allocated for namespace and ACPI table storage.
721  *
722  ******************************************************************************/
723 
724 void acpi_ns_terminate(void)
725 {
726 	union acpi_operand_object *obj_desc;
727 
728 	ACPI_FUNCTION_TRACE(ns_terminate);
729 
730 	/*
731 	 * 1) Free the entire namespace -- all nodes and objects
732 	 *
733 	 * Delete all object descriptors attached to namepsace nodes
734 	 */
735 	acpi_ns_delete_namespace_subtree(acpi_gbl_root_node);
736 
737 	/* Detach any objects attached to the root */
738 
739 	obj_desc = acpi_ns_get_attached_object(acpi_gbl_root_node);
740 	if (obj_desc) {
741 		acpi_ns_detach_object(acpi_gbl_root_node);
742 	}
743 
744 	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Namespace freed\n"));
745 	return_VOID;
746 }
747 
748 /*******************************************************************************
749  *
750  * FUNCTION:    acpi_ns_opens_scope
751  *
752  * PARAMETERS:  Type        - A valid namespace type
753  *
754  * RETURN:      NEWSCOPE if the passed type "opens a name scope" according
755  *              to the ACPI specification, else 0
756  *
757  ******************************************************************************/
758 
759 u32 acpi_ns_opens_scope(acpi_object_type type)
760 {
761 	ACPI_FUNCTION_TRACE_STR(ns_opens_scope, acpi_ut_get_type_name(type));
762 
763 	if (!acpi_ut_valid_object_type(type)) {
764 
765 		/* type code out of range  */
766 
767 		ACPI_WARNING((AE_INFO, "Invalid Object Type %X", type));
768 		return_UINT32(ACPI_NS_NORMAL);
769 	}
770 
771 	return_UINT32(((u32) acpi_gbl_ns_properties[type]) & ACPI_NS_NEWSCOPE);
772 }
773 
774 /*******************************************************************************
775  *
776  * FUNCTION:    acpi_ns_get_node
777  *
778  * PARAMETERS:  *Pathname   - Name to be found, in external (ASL) format. The
779  *                            \ (backslash) and ^ (carat) prefixes, and the
780  *                            . (period) to separate segments are supported.
781  *              prefix_node  - Root of subtree to be searched, or NS_ALL for the
782  *                            root of the name space.  If Name is fully
783  *                            qualified (first s8 is '\'), the passed value
784  *                            of Scope will not be accessed.
785  *              Flags       - Used to indicate whether to perform upsearch or
786  *                            not.
787  *              return_node - Where the Node is returned
788  *
789  * DESCRIPTION: Look up a name relative to a given scope and return the
790  *              corresponding Node.  NOTE: Scope can be null.
791  *
792  * MUTEX:       Locks namespace
793  *
794  ******************************************************************************/
795 
796 acpi_status
797 acpi_ns_get_node(struct acpi_namespace_node *prefix_node,
798 		 const char *pathname,
799 		 u32 flags, struct acpi_namespace_node **return_node)
800 {
801 	union acpi_generic_state scope_info;
802 	acpi_status status;
803 	char *internal_path;
804 
805 	ACPI_FUNCTION_TRACE_PTR(ns_get_node, ACPI_CAST_PTR(char, pathname));
806 
807 	if (!pathname) {
808 		*return_node = prefix_node;
809 		if (!prefix_node) {
810 			*return_node = acpi_gbl_root_node;
811 		}
812 		return_ACPI_STATUS(AE_OK);
813 	}
814 
815 	/* Convert path to internal representation */
816 
817 	status = acpi_ns_internalize_name(pathname, &internal_path);
818 	if (ACPI_FAILURE(status)) {
819 		return_ACPI_STATUS(status);
820 	}
821 
822 	/* Must lock namespace during lookup */
823 
824 	status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
825 	if (ACPI_FAILURE(status)) {
826 		goto cleanup;
827 	}
828 
829 	/* Setup lookup scope (search starting point) */
830 
831 	scope_info.scope.node = prefix_node;
832 
833 	/* Lookup the name in the namespace */
834 
835 	status = acpi_ns_lookup(&scope_info, internal_path, ACPI_TYPE_ANY,
836 				ACPI_IMODE_EXECUTE,
837 				(flags | ACPI_NS_DONT_OPEN_SCOPE), NULL,
838 				return_node);
839 	if (ACPI_FAILURE(status)) {
840 		ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "%s, %s\n",
841 				  pathname, acpi_format_exception(status)));
842 	}
843 
844 	(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
845 
846       cleanup:
847 	ACPI_FREE(internal_path);
848 	return_ACPI_STATUS(status);
849 }
850 
851 /*******************************************************************************
852  *
853  * FUNCTION:    acpi_ns_get_parent_node
854  *
855  * PARAMETERS:  Node       - Current table entry
856  *
857  * RETURN:      Parent entry of the given entry
858  *
859  * DESCRIPTION: Obtain the parent entry for a given entry in the namespace.
860  *
861  ******************************************************************************/
862 
863 struct acpi_namespace_node *acpi_ns_get_parent_node(struct acpi_namespace_node
864 						    *node)
865 {
866 	ACPI_FUNCTION_ENTRY();
867 
868 	if (!node) {
869 		return (NULL);
870 	}
871 
872 	/*
873 	 * Walk to the end of this peer list. The last entry is marked with a flag
874 	 * and the peer pointer is really a pointer back to the parent. This saves
875 	 * putting a parent back pointer in each and every named object!
876 	 */
877 	while (!(node->flags & ANOBJ_END_OF_PEER_LIST)) {
878 		node = node->peer;
879 	}
880 
881 	return (node->peer);
882 }
883 
884 /*******************************************************************************
885  *
886  * FUNCTION:    acpi_ns_get_next_valid_node
887  *
888  * PARAMETERS:  Node       - Current table entry
889  *
890  * RETURN:      Next valid Node in the linked node list. NULL if no more valid
891  *              nodes.
892  *
893  * DESCRIPTION: Find the next valid node within a name table.
894  *              Useful for implementing NULL-end-of-list loops.
895  *
896  ******************************************************************************/
897 
898 struct acpi_namespace_node *acpi_ns_get_next_valid_node(struct
899 							acpi_namespace_node
900 							*node)
901 {
902 
903 	/* If we are at the end of this peer list, return NULL */
904 
905 	if (node->flags & ANOBJ_END_OF_PEER_LIST) {
906 		return NULL;
907 	}
908 
909 	/* Otherwise just return the next peer */
910 
911 	return (node->peer);
912 }
913 
914 #ifdef ACPI_OBSOLETE_FUNCTIONS
915 /*******************************************************************************
916  *
917  * FUNCTION:    acpi_ns_find_parent_name
918  *
919  * PARAMETERS:  *child_node            - Named Obj whose name is to be found
920  *
921  * RETURN:      The ACPI name
922  *
923  * DESCRIPTION: Search for the given obj in its parent scope and return the
924  *              name segment, or "????" if the parent name can't be found
925  *              (which "should not happen").
926  *
927  ******************************************************************************/
928 
929 acpi_name acpi_ns_find_parent_name(struct acpi_namespace_node * child_node)
930 {
931 	struct acpi_namespace_node *parent_node;
932 
933 	ACPI_FUNCTION_TRACE(ns_find_parent_name);
934 
935 	if (child_node) {
936 
937 		/* Valid entry.  Get the parent Node */
938 
939 		parent_node = acpi_ns_get_parent_node(child_node);
940 		if (parent_node) {
941 			ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
942 					  "Parent of %p [%4.4s] is %p [%4.4s]\n",
943 					  child_node,
944 					  acpi_ut_get_node_name(child_node),
945 					  parent_node,
946 					  acpi_ut_get_node_name(parent_node)));
947 
948 			if (parent_node->name.integer) {
949 				return_VALUE((acpi_name) parent_node->name.
950 					     integer);
951 			}
952 		}
953 
954 		ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
955 				  "Unable to find parent of %p (%4.4s)\n",
956 				  child_node,
957 				  acpi_ut_get_node_name(child_node)));
958 	}
959 
960 	return_VALUE(ACPI_UNKNOWN_NAME);
961 }
962 #endif
963