Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
[linux-btrfs-devel.git] / drivers / acpi / acpica / rslist.c
blob1bfcef736c5079695dd871d4490ae34bb612600b
1 /*******************************************************************************
3 * Module Name: rslist - Linked list utilities
5 ******************************************************************************/
7 /*
8 * Copyright (C) 2000 - 2011, Intel Corp.
9 * All rights reserved.
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.
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.
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.
44 #include <acpi/acpi.h>
45 #include "accommon.h"
46 #include "acresrc.h"
48 #define _COMPONENT ACPI_RESOURCES
49 ACPI_MODULE_NAME("rslist")
51 /*******************************************************************************
53 * FUNCTION: acpi_rs_convert_aml_to_resources
55 * PARAMETERS: acpi_walk_aml_callback
56 * resource_ptr - Pointer to the buffer that will
57 * contain the output structures
59 * RETURN: Status
61 * DESCRIPTION: Convert an AML resource to an internal representation of the
62 * resource that is aligned and easier to access.
64 ******************************************************************************/
65 acpi_status
66 acpi_rs_convert_aml_to_resources(u8 * aml,
67 u32 length,
68 u32 offset, u8 resource_index, void **context)
70 struct acpi_resource **resource_ptr =
71 ACPI_CAST_INDIRECT_PTR(struct acpi_resource, context);
72 struct acpi_resource *resource;
73 acpi_status status;
75 ACPI_FUNCTION_TRACE(rs_convert_aml_to_resources);
78 * Check that the input buffer and all subsequent pointers into it
79 * are aligned on a native word boundary. Most important on IA64
81 resource = *resource_ptr;
82 if (ACPI_IS_MISALIGNED(resource)) {
83 ACPI_WARNING((AE_INFO,
84 "Misaligned resource pointer %p", resource));
87 /* Convert the AML byte stream resource to a local resource struct */
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 0x%X)",
98 *aml));
99 return_ACPI_STATUS(status);
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));
107 /* Point to the next structure in the output buffer */
109 *resource_ptr = ACPI_ADD_PTR(void, resource, resource->length);
110 return_ACPI_STATUS(AE_OK);
113 /*******************************************************************************
115 * FUNCTION: acpi_rs_convert_resources_to_aml
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
125 * RETURN: Status
127 * DESCRIPTION: Takes the resource linked list and parses it, creating a
128 * byte stream of resources in the caller's output buffer
130 ******************************************************************************/
132 acpi_status
133 acpi_rs_convert_resources_to_aml(struct acpi_resource *resource,
134 acpi_size aml_size_needed, u8 * output_buffer)
136 u8 *aml = output_buffer;
137 u8 *end_aml = output_buffer + aml_size_needed;
138 acpi_status status;
140 ACPI_FUNCTION_TRACE(rs_convert_resources_to_aml);
142 /* Walk the resource descriptor list, convert each descriptor */
144 while (aml < end_aml) {
146 /* Validate the (internal) Resource Type */
148 if (resource->type > ACPI_RESOURCE_TYPE_MAX) {
149 ACPI_ERROR((AE_INFO,
150 "Invalid descriptor type (0x%X) in resource list",
151 resource->type));
152 return_ACPI_STATUS(AE_BAD_DATA);
155 /* Perform the conversion */
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 0x%X) to AML",
165 resource->type));
166 return_ACPI_STATUS(status);
169 /* Perform final sanity check on the new AML resource descriptor */
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);
178 /* Check for end-of-list, normal exit */
180 if (resource->type == ACPI_RESOURCE_TYPE_END_TAG) {
182 /* An End Tag indicates the end of the input Resource Template */
184 return_ACPI_STATUS(AE_OK);
188 * Extract the total length of the new descriptor and set the
189 * Aml to point to the next (output) resource descriptor
191 aml += acpi_ut_get_descriptor_length(aml);
193 /* Point to the next input resource descriptor */
195 resource =
196 ACPI_ADD_PTR(struct acpi_resource, resource,
197 resource->length);
200 /* Completed buffer, but did not find an end_tag resource descriptor */
202 return_ACPI_STATUS(AE_AML_NO_RESOURCE_END_TAG);