Merge branch 'master' of /repos/git/net-2.6
[linux-2.6] / drivers / acpi / acpica / 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 "accommon.h"
46 #include "acresrc.h"
47
48 #define _COMPONENT          ACPI_RESOURCES
49 ACPI_MODULE_NAME("rslist")
50
51 /*******************************************************************************
52  *
53  * FUNCTION:    acpi_rs_convert_aml_to_resources
54  *
55  * PARAMETERS:  acpi_walk_aml_callback
56  *              resource_ptr            - Pointer to the buffer that will
57  *                                        contain the output structures
58  *
59  * RETURN:      Status
60  *
61  * DESCRIPTION: Convert an AML resource to an internal representation of the
62  *              resource that is aligned and easier to access.
63  *
64  ******************************************************************************/
65 acpi_status
66 acpi_rs_convert_aml_to_resources(u8 * aml,
67                                  u32 length,
68                                  u32 offset, u8 resource_index, void **context)
69 {
70         struct acpi_resource **resource_ptr =
71             ACPI_CAST_INDIRECT_PTR(struct acpi_resource, context);
72         struct acpi_resource *resource;
73         acpi_status status;
74
75         ACPI_FUNCTION_TRACE(rs_convert_aml_to_resources);
76
77         /*
78          * Check that the input buffer and all subsequent pointers into it
79          * are aligned on a native word boundary. Most important on IA64
80          */
81         resource = *resource_ptr;
82         if (ACPI_IS_MISALIGNED(resource)) {
83                 ACPI_WARNING((AE_INFO,
84                               "Misaligned resource pointer %p", resource));
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 aml_resource,
92                                                           aml),
93                                             acpi_gbl_get_resource_dispatch
94                                             [resource_index]);
95         if (ACPI_FAILURE(status)) {
96                 ACPI_EXCEPTION((AE_INFO, status,
97                                 "Could not convert AML resource (Type %X)",
98                                 *aml));
99                 return_ACPI_STATUS(status);
100         }
101
102         ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES,
103                           "Type %.2X, AmlLength %.2X InternalLength %.2X\n",
104                           acpi_ut_get_resource_type(aml), length,
105                           resource->length));
106
107         /* Point to the next structure in the output buffer */
108
109         *resource_ptr = ACPI_ADD_PTR(void, resource, resource->length);
110         return_ACPI_STATUS(AE_OK);
111 }
112
113 /*******************************************************************************
114  *
115  * FUNCTION:    acpi_rs_convert_resources_to_aml
116  *
117  * PARAMETERS:  Resource            - Pointer to the resource linked list
118  *              aml_size_needed     - Calculated size of the byte stream
119  *                                    needed from calling acpi_rs_get_aml_length()
120  *                                    The size of the output_buffer is
121  *                                    guaranteed to be >= aml_size_needed
122  *              output_buffer       - Pointer to the buffer that will
123  *                                    contain the byte stream
124  *
125  * RETURN:      Status
126  *
127  * DESCRIPTION: Takes the resource linked list and parses it, creating a
128  *              byte stream of resources in the caller's output buffer
129  *
130  ******************************************************************************/
131
132 acpi_status
133 acpi_rs_convert_resources_to_aml(struct acpi_resource *resource,
134                                  acpi_size aml_size_needed, u8 * output_buffer)
135 {
136         u8 *aml = output_buffer;
137         u8 *end_aml = output_buffer + aml_size_needed;
138         acpi_status status;
139
140         ACPI_FUNCTION_TRACE(rs_convert_resources_to_aml);
141
142         /* Walk the resource descriptor list, convert each descriptor */
143
144         while (aml < end_aml) {
145
146                 /* Validate the (internal) Resource Type */
147
148                 if (resource->type > ACPI_RESOURCE_TYPE_MAX) {
149                         ACPI_ERROR((AE_INFO,
150                                     "Invalid descriptor type (%X) in resource list",
151                                     resource->type));
152                         return_ACPI_STATUS(AE_BAD_DATA);
153                 }
154
155                 /* Perform the conversion */
156
157                 status = acpi_rs_convert_resource_to_aml(resource, ACPI_CAST_PTR(union
158                                                                                  aml_resource,
159                                                                                  aml),
160                                                          acpi_gbl_set_resource_dispatch
161                                                          [resource->type]);
162                 if (ACPI_FAILURE(status)) {
163                         ACPI_EXCEPTION((AE_INFO, status,
164                                         "Could not convert resource (type %X) to AML",
165                                         resource->type));
166                         return_ACPI_STATUS(status);
167                 }
168
169                 /* Perform final sanity check on the new AML resource descriptor */
170
171                 status =
172                     acpi_ut_validate_resource(ACPI_CAST_PTR
173                                               (union aml_resource, aml), NULL);
174                 if (ACPI_FAILURE(status)) {
175                         return_ACPI_STATUS(status);
176                 }
177
178                 /* Check for end-of-list, normal exit */
179
180                 if (resource->type == ACPI_RESOURCE_TYPE_END_TAG) {
181
182                         /* An End Tag indicates the end of the input Resource Template */
183
184                         return_ACPI_STATUS(AE_OK);
185                 }
186
187                 /*
188                  * Extract the total length of the new descriptor and set the
189                  * Aml to point to the next (output) resource descriptor
190                  */
191                 aml += acpi_ut_get_descriptor_length(aml);
192
193                 /* Point to the next input resource descriptor */
194
195                 resource =
196                     ACPI_ADD_PTR(struct acpi_resource, resource,
197                                  resource->length);
198         }
199
200         /* Completed buffer, but did not find an end_tag resource descriptor */
201
202         return_ACPI_STATUS(AE_AML_NO_RESOURCE_END_TAG);
203 }