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/drivers/acpi/namespace/nsnames.c

https://bitbucket.org/evzijst/gittest
C | 265 lines | 96 code | 62 blank | 107 comment | 13 complexity | 4f651376bbd210b7411c1920dd01ef26 MD5 | raw file
  1/*******************************************************************************
  2 *
  3 * Module Name: nsnames - Name manipulation and search
  4 *
  5 ******************************************************************************/
  6
  7/*
  8 * Copyright (C) 2000 - 2005, R. Byron Moore
  9 * All rights reserved.
 10 *
 11 * Redistribution and use in source and binary forms, with or without
 12 * modification, are permitted provided that the following conditions
 13 * are met:
 14 * 1. Redistributions of source code must retain the above copyright
 15 *    notice, this list of conditions, and the following disclaimer,
 16 *    without modification.
 17 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
 18 *    substantially similar to the "NO WARRANTY" disclaimer below
 19 *    ("Disclaimer") and any redistribution must be conditioned upon
 20 *    including a substantially similar Disclaimer requirement for further
 21 *    binary redistribution.
 22 * 3. Neither the names of the above-listed copyright holders nor the names
 23 *    of any contributors may be used to endorse or promote products derived
 24 *    from this software without specific prior written permission.
 25 *
 26 * Alternatively, this software may be distributed under the terms of the
 27 * GNU General Public License ("GPL") version 2 as published by the Free
 28 * Software Foundation.
 29 *
 30 * NO WARRANTY
 31 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 32 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 33 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
 34 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 35 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 36 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 37 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 38 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 39 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
 40 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 41 * POSSIBILITY OF SUCH DAMAGES.
 42 */
 43
 44
 45#include <acpi/acpi.h>
 46#include <acpi/amlcode.h>
 47#include <acpi/acnamesp.h>
 48
 49
 50#define _COMPONENT          ACPI_NAMESPACE
 51	 ACPI_MODULE_NAME    ("nsnames")
 52
 53
 54/*******************************************************************************
 55 *
 56 * FUNCTION:    acpi_ns_build_external_path
 57 *
 58 * PARAMETERS:  Node            - NS node whose pathname is needed
 59 *              Size            - Size of the pathname
 60 *              *name_buffer    - Where to return the pathname
 61 *
 62 * RETURN:      Places the pathname into the name_buffer, in external format
 63 *              (name segments separated by path separators)
 64 *
 65 * DESCRIPTION: Generate a full pathaname
 66 *
 67 ******************************************************************************/
 68
 69void
 70acpi_ns_build_external_path (
 71	struct acpi_namespace_node      *node,
 72	acpi_size                       size,
 73	char                            *name_buffer)
 74{
 75	acpi_size                       index;
 76	struct acpi_namespace_node      *parent_node;
 77
 78
 79	ACPI_FUNCTION_NAME ("ns_build_external_path");
 80
 81
 82	/* Special case for root */
 83
 84	index = size - 1;
 85	if (index < ACPI_NAME_SIZE) {
 86		name_buffer[0] = AML_ROOT_PREFIX;
 87		name_buffer[1] = 0;
 88		return;
 89	}
 90
 91	/* Store terminator byte, then build name backwards */
 92
 93	parent_node = node;
 94	name_buffer[index] = 0;
 95
 96	while ((index > ACPI_NAME_SIZE) && (parent_node != acpi_gbl_root_node)) {
 97		index -= ACPI_NAME_SIZE;
 98
 99		/* Put the name into the buffer */
100
101		ACPI_MOVE_32_TO_32 ((name_buffer + index), &parent_node->name);
102		parent_node = acpi_ns_get_parent_node (parent_node);
103
104		/* Prefix name with the path separator */
105
106		index--;
107		name_buffer[index] = ACPI_PATH_SEPARATOR;
108	}
109
110	/* Overwrite final separator with the root prefix character */
111
112	name_buffer[index] = AML_ROOT_PREFIX;
113
114	if (index != 0) {
115		ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
116			"Could not construct pathname; index=%X, size=%X, Path=%s\n",
117			(u32) index, (u32) size, &name_buffer[size]));
118	}
119
120	return;
121}
122
123
124#ifdef ACPI_DEBUG_OUTPUT
125/*******************************************************************************
126 *
127 * FUNCTION:    acpi_ns_get_external_pathname
128 *
129 * PARAMETERS:  Node            - NS node whose pathname is needed
130 *
131 * RETURN:      Pointer to storage containing the fully qualified name of
132 *              the node, In external format (name segments separated by path
133 *              separators.)
134 *
135 * DESCRIPTION: Used for debug printing in acpi_ns_search_table().
136 *
137 ******************************************************************************/
138
139char *
140acpi_ns_get_external_pathname (
141	struct acpi_namespace_node      *node)
142{
143	char                            *name_buffer;
144	acpi_size                       size;
145
146
147	ACPI_FUNCTION_TRACE_PTR ("ns_get_external_pathname", node);
148
149
150	/* Calculate required buffer size based on depth below root */
151
152	size = acpi_ns_get_pathname_length (node);
153
154	/* Allocate a buffer to be returned to caller */
155
156	name_buffer = ACPI_MEM_CALLOCATE (size);
157	if (!name_buffer) {
158		ACPI_REPORT_ERROR (("ns_get_table_pathname: allocation failure\n"));
159		return_PTR (NULL);
160	}
161
162	/* Build the path in the allocated buffer */
163
164	acpi_ns_build_external_path (node, size, name_buffer);
165	return_PTR (name_buffer);
166}
167#endif
168
169
170/*******************************************************************************
171 *
172 * FUNCTION:    acpi_ns_get_pathname_length
173 *
174 * PARAMETERS:  Node        - Namespace node
175 *
176 * RETURN:      Length of path, including prefix
177 *
178 * DESCRIPTION: Get the length of the pathname string for this node
179 *
180 ******************************************************************************/
181
182acpi_size
183acpi_ns_get_pathname_length (
184	struct acpi_namespace_node      *node)
185{
186	acpi_size                       size;
187	struct acpi_namespace_node      *next_node;
188
189
190	ACPI_FUNCTION_ENTRY ();
191
192
193	/*
194	 * Compute length of pathname as 5 * number of name segments.
195	 * Go back up the parent tree to the root
196	 */
197	size = 0;
198	next_node = node;
199
200	while (next_node && (next_node != acpi_gbl_root_node)) {
201		size += ACPI_PATH_SEGMENT_LENGTH;
202		next_node = acpi_ns_get_parent_node (next_node);
203	}
204
205	if (!size) {
206		size = 1;       /* Root node case */
207	}
208
209	return (size + 1);  /* +1 for null string terminator */
210}
211
212
213/*******************************************************************************
214 *
215 * FUNCTION:    acpi_ns_handle_to_pathname
216 *
217 * PARAMETERS:  target_handle           - Handle of named object whose name is
218 *                                        to be found
219 *              Buffer                  - Where the pathname is returned
220 *
221 * RETURN:      Status, Buffer is filled with pathname if status is AE_OK
222 *
223 * DESCRIPTION: Build and return a full namespace pathname
224 *
225 ******************************************************************************/
226
227acpi_status
228acpi_ns_handle_to_pathname (
229	acpi_handle                     target_handle,
230	struct acpi_buffer              *buffer)
231{
232	acpi_status                     status;
233	struct acpi_namespace_node      *node;
234	acpi_size                       required_size;
235
236
237	ACPI_FUNCTION_TRACE_PTR ("ns_handle_to_pathname", target_handle);
238
239
240	node = acpi_ns_map_handle_to_node (target_handle);
241	if (!node) {
242		return_ACPI_STATUS (AE_BAD_PARAMETER);
243	}
244
245	/* Determine size required for the caller buffer */
246
247	required_size = acpi_ns_get_pathname_length (node);
248
249	/* Validate/Allocate/Clear caller buffer */
250
251	status = acpi_ut_initialize_buffer (buffer, required_size);
252	if (ACPI_FAILURE (status)) {
253		return_ACPI_STATUS (status);
254	}
255
256	/* Build the path in the caller buffer */
257
258	acpi_ns_build_external_path (node, required_size, buffer->pointer);
259
260	ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "%s [%X] \n",
261		(char *) buffer->pointer, (u32) required_size));
262	return_ACPI_STATUS (AE_OK);
263}
264
265