Merge branch 'master' of /pub/scm/linux/kernel/git/torvalds/linux-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 - 2008, Intel Corp.
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:  acpi_walk_aml_callback
55  *              resource_ptr            - Pointer to the buffer that will
56  *                                        contain the output structures
57  *
58  * RETURN:      Status
59  *
60  * DESCRIPTION: Convert an AML resource to an internal representation of the
61  *              resource that is aligned and easier to access.
62  *
63  ******************************************************************************/
64 acpi_status
65 acpi_rs_convert_aml_to_resources(u8 * aml,
66                                  u32 length,
67                                  u32 offset, u8 resource_index, void **context)
68 {
69         struct acpi_resource **resource_ptr =
70             ACPI_CAST_INDIRECT_PTR(struct acpi_resource, context);
71         struct acpi_resource *resource;
72         acpi_status status;
73
74         ACPI_FUNCTION_TRACE(rs_convert_aml_to_resources);
75
76         /*
77          * Check that the input buffer and all subsequent pointers into it
78          * are aligned on a native word boundary. Most important on IA64
79          */
80         resource = *resource_ptr;
81         if (ACPI_IS_MISALIGNED(resource)) {
82                 ACPI_WARNING((AE_INFO,
83                               "Misaligned resource pointer %p", resource));
84         }
85
86         /* Convert the AML byte stream resource to a local resource struct */
87
88         status =
89             acpi_rs_convert_aml_to_resource(resource,
90                                             ACPI_CAST_PTR(union aml_resource,
91                                                           aml),
92                                             acpi_gbl_get_resource_dispatch
93                                             [resource_index]);
94         if (ACPI_FAILURE(status)) {
95                 ACPI_EXCEPTION((AE_INFO, status,
96                                 "Could not convert AML resource (Type %X)",
97                                 *aml));
98                 return_ACPI_STATUS(status);
99         }
100
101         ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES,
102                           "Type %.2X, AmlLength %.2X InternalLength %.2X\n",
103                           acpi_ut_get_resource_type(aml), length,
104                           resource->length));
105
106         /* Point to the next structure in the output buffer */
107
108         *resource_ptr = ACPI_ADD_PTR(void, resource, resource->length);
109         return_ACPI_STATUS(AE_OK);
110 }
111
112 /*******************************************************************************
113  *
114  * FUNCTION:    acpi_rs_convert_resources_to_aml
115  *
116  * PARAMETERS:  Resource            - Pointer to the resource linked list
117  *              aml_size_needed     - Calculated size of the byte stream
118  *                                    needed from calling acpi_rs_get_aml_length()
119  *                                    The size of the output_buffer is
120  *                                    guaranteed to be >= aml_size_needed
121  *              output_buffer       - Pointer to the buffer that will
122  *                                    contain the byte stream
123  *
124  * RETURN:      Status
125  *
126  * DESCRIPTION: Takes the resource linked list and parses it, creating a
127  *              byte stream of resources in the caller's output buffer
128  *
129  ******************************************************************************/
130
131 acpi_status
132 acpi_rs_convert_resources_to_aml(struct acpi_resource *resource,
133                                  acpi_size aml_size_needed, u8 * output_buffer)
134 {
135         u8 *aml = output_buffer;
136         u8 *end_aml = output_buffer + aml_size_needed;
137         acpi_status status;
138
139         ACPI_FUNCTION_TRACE(rs_convert_resources_to_aml);
140
141         /* Walk the resource descriptor list, convert each descriptor */
142
143         while (aml < end_aml) {
144
145                 /* Validate the (internal) Resource Type */
146
147                 if (resource->type > ACPI_RESOURCE_TYPE_MAX) {
148                         ACPI_ERROR((AE_INFO,
149                                     "Invalid descriptor type (%X) in resource list",
150                                     resource->type));
151                         return_ACPI_STATUS(AE_BAD_DATA);
152                 }
153
154                 /* Perform the conversion */
155
156                 status = acpi_rs_convert_resource_to_aml(resource, ACPI_CAST_PTR(union
157                                                                                  aml_resource,
158                                                                                  aml),
159                                                          acpi_gbl_set_resource_dispatch
160                                                          [resource->type]);
161                 if (ACPI_FAILURE(status)) {
162                         ACPI_EXCEPTION((AE_INFO, status,
163                                         "Could not convert resource (type %X) to AML",
164                                         resource->type));
165                         return_ACPI_STATUS(status);
166                 }
167
168                 /* Perform final sanity check on the new AML resource descriptor */
169
170                 status =
171                     acpi_ut_validate_resource(ACPI_CAST_PTR
172                                               (union aml_resource, aml), NULL);
173                 if (ACPI_FAILURE(status)) {
174                         return_ACPI_STATUS(status);
175                 }
176
177                 /* Check for end-of-list, normal exit */
178
179                 if (resource->type == ACPI_RESOURCE_TYPE_END_TAG) {
180
181                         /* An End Tag indicates the end of the input Resource Template */
182
183                         return_ACPI_STATUS(AE_OK);
184                 }
185
186                 /*
187                  * Extract the total length of the new descriptor and set the
188                  * Aml to point to the next (output) resource descriptor
189                  */
190                 aml += acpi_ut_get_descriptor_length(aml);
191
192                 /* Point to the next input resource descriptor */
193
194                 resource =
195                     ACPI_ADD_PTR(struct acpi_resource, resource,
196                                  resource->length);
197         }
198
199         /* Completed buffer, but did not find an end_tag resource descriptor */
200
201         return_ACPI_STATUS(AE_AML_NO_RESOURCE_END_TAG);
202 }