Merge master.kernel.org:/pub/scm/linux/kernel/git/kyle/parisc-2.6
[linux-2.6] / drivers / acpi / resources / rslist.c
1 /*******************************************************************************
2  *
3  * Module Name: rslist - Linked list utilities
4  *
5  ******************************************************************************/
6
7 /*
8  * Copyright (C) 2000 - 2006, 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 #include <acpi/acpi.h>
45 #include <acpi/acresrc.h>
46
47 #define _COMPONENT          ACPI_RESOURCES
48 ACPI_MODULE_NAME("rslist")
49
50 /*******************************************************************************
51  *
52  * FUNCTION:    acpi_rs_convert_aml_to_resources
53  *
54  * PARAMETERS:  Aml                 - Pointer to the resource byte stream
55  *              aml_length          - Length of Aml
56  *              output_buffer       - Pointer to the buffer that will
57  *                                    contain the output structures
58  *
59  * RETURN:      Status
60  *
61  * DESCRIPTION: Takes the resource byte stream and parses it, creating a
62  *              linked list of resources in the caller's output buffer
63  *
64  ******************************************************************************/
65 acpi_status
66 acpi_rs_convert_aml_to_resources(u8 * aml, u32 aml_length, u8 * output_buffer)
67 {
68         struct acpi_resource *resource = (void *)output_buffer;
69         acpi_status status;
70         u8 resource_index;
71         u8 *end_aml;
72
73         ACPI_FUNCTION_TRACE("rs_convert_aml_to_resources");
74
75         end_aml = aml + aml_length;
76
77         /* Loop until end-of-buffer or an end_tag is found */
78
79         while (aml < end_aml) {
80                 /* Validate the Resource Type and Resource Length */
81
82                 status = acpi_ut_validate_resource(aml, &resource_index);
83                 if (ACPI_FAILURE(status)) {
84                         return_ACPI_STATUS(status);
85                 }
86
87                 /* Convert the AML byte stream resource to a local resource struct */
88
89                 status =
90                     acpi_rs_convert_aml_to_resource(resource,
91                                                     ACPI_CAST_PTR(union
92                                                                   aml_resource,
93                                                                   aml),
94                                                     acpi_gbl_get_resource_dispatch
95                                                     [resource_index]);
96                 if (ACPI_FAILURE(status)) {
97                         ACPI_EXCEPTION((AE_INFO, status,
98                                         "Could not convert AML resource (Type %X)",
99                                         *aml));
100                         return_ACPI_STATUS(status);
101                 }
102
103                 /* Normal exit on completion of an end_tag resource descriptor */
104
105                 if (acpi_ut_get_resource_type(aml) ==
106                     ACPI_RESOURCE_NAME_END_TAG) {
107                         return_ACPI_STATUS(AE_OK);
108                 }
109
110                 /* Point to the next input AML resource */
111
112                 aml += acpi_ut_get_descriptor_length(aml);
113
114                 /* Point to the next structure in the output buffer */
115
116                 resource =
117                     ACPI_ADD_PTR(struct acpi_resource, resource,
118                                  resource->length);
119         }
120
121         /* Did not find an end_tag resource descriptor */
122
123         return_ACPI_STATUS(AE_AML_NO_RESOURCE_END_TAG);
124 }
125
126 /*******************************************************************************
127  *
128  * FUNCTION:    acpi_rs_convert_resources_to_aml
129  *
130  * PARAMETERS:  Resource            - Pointer to the resource linked list
131  *              aml_size_needed     - Calculated size of the byte stream
132  *                                    needed from calling acpi_rs_get_aml_length()
133  *                                    The size of the output_buffer is
134  *                                    guaranteed to be >= aml_size_needed
135  *              output_buffer       - Pointer to the buffer that will
136  *                                    contain the byte stream
137  *
138  * RETURN:      Status
139  *
140  * DESCRIPTION: Takes the resource linked list and parses it, creating a
141  *              byte stream of resources in the caller's output buffer
142  *
143  ******************************************************************************/
144
145 acpi_status
146 acpi_rs_convert_resources_to_aml(struct acpi_resource *resource,
147                                  acpi_size aml_size_needed, u8 * output_buffer)
148 {
149         u8 *aml = output_buffer;
150         u8 *end_aml = output_buffer + aml_size_needed;
151         acpi_status status;
152
153         ACPI_FUNCTION_TRACE("rs_convert_resources_to_aml");
154
155         /* Walk the resource descriptor list, convert each descriptor */
156
157         while (aml < end_aml) {
158                 /* Validate the (internal) Resource Type */
159
160                 if (resource->type > ACPI_RESOURCE_TYPE_MAX) {
161                         ACPI_ERROR((AE_INFO,
162                                     "Invalid descriptor type (%X) in resource list",
163                                     resource->type));
164                         return_ACPI_STATUS(AE_BAD_DATA);
165                 }
166
167                 /* Perform the conversion */
168
169                 status = acpi_rs_convert_resource_to_aml(resource,
170                                                          ACPI_CAST_PTR(union
171                                                                        aml_resource,
172                                                                        aml),
173                                                          acpi_gbl_set_resource_dispatch
174                                                          [resource->type]);
175                 if (ACPI_FAILURE(status)) {
176                         ACPI_EXCEPTION((AE_INFO, status,
177                                         "Could not convert resource (type %X) to AML",
178                                         resource->type));
179                         return_ACPI_STATUS(status);
180                 }
181
182                 /* Perform final sanity check on the new AML resource descriptor */
183
184                 status =
185                     acpi_ut_validate_resource(ACPI_CAST_PTR
186                                               (union aml_resource, aml), NULL);
187                 if (ACPI_FAILURE(status)) {
188                         return_ACPI_STATUS(status);
189                 }
190
191                 /* Check for end-of-list, normal exit */
192
193                 if (resource->type == ACPI_RESOURCE_TYPE_END_TAG) {
194                         /* An End Tag indicates the end of the input Resource Template */
195
196                         return_ACPI_STATUS(AE_OK);
197                 }
198
199                 /*
200                  * Extract the total length of the new descriptor and set the
201                  * Aml to point to the next (output) resource descriptor
202                  */
203                 aml += acpi_ut_get_descriptor_length(aml);
204
205                 /* Point to the next input resource descriptor */
206
207                 resource =
208                     ACPI_ADD_PTR(struct acpi_resource, resource,
209                                  resource->length);
210         }
211
212         /* Completed buffer, but did not find an end_tag resource descriptor */
213
214         return_ACPI_STATUS(AE_AML_NO_RESOURCE_END_TAG);
215 }