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1/*******************************************************************************
2 *
3 * Module Name: rslist - Linked list utilities
4 *
5 ******************************************************************************/
6
7/*
8 * Copyright (C) 2000 - 2016, 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
49ACPI_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 ******************************************************************************/
65acpi_status
66acpi_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 union aml_resource *aml_resource;
74 struct acpi_rsconvert_info *conversion_table;
75 acpi_status status;
76
77 ACPI_FUNCTION_TRACE(rs_convert_aml_to_resources);
78
79 /*
80 * Check that the input buffer and all subsequent pointers into it
81 * are aligned on a native word boundary. Most important on IA64
82 */
83 resource = *resource_ptr;
84 if (ACPI_IS_MISALIGNED(resource)) {
85 ACPI_WARNING((AE_INFO,
86 "Misaligned resource pointer %p", resource));
87 }
88
89 /* Get the appropriate conversion info table */
90
91 aml_resource = ACPI_CAST_PTR(union aml_resource, aml);
92
93 if (acpi_ut_get_resource_type(aml) == ACPI_RESOURCE_NAME_SERIAL_BUS) {
94 if (aml_resource->common_serial_bus.type >
95 AML_RESOURCE_MAX_SERIALBUSTYPE) {
96 conversion_table = NULL;
97 } else {
98 /* This is an I2C, SPI, or UART serial_bus descriptor */
99
100 conversion_table =
101 acpi_gbl_convert_resource_serial_bus_dispatch
102 [aml_resource->common_serial_bus.type];
103 }
104 } else {
105 conversion_table =
106 acpi_gbl_get_resource_dispatch[resource_index];
107 }
108
109 if (!conversion_table) {
110 ACPI_ERROR((AE_INFO,
111 "Invalid/unsupported resource descriptor: Type 0x%2.2X",
112 resource_index));
113 return_ACPI_STATUS(AE_AML_INVALID_RESOURCE_TYPE);
114 }
115
116 /* Convert the AML byte stream resource to a local resource struct */
117
118 status =
119 acpi_rs_convert_aml_to_resource(resource, aml_resource,
120 conversion_table);
121 if (ACPI_FAILURE(status)) {
122 ACPI_EXCEPTION((AE_INFO, status,
123 "Could not convert AML resource (Type 0x%X)",
124 *aml));
125 return_ACPI_STATUS(status);
126 }
127
128 ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES,
129 "Type %.2X, AmlLength %.2X InternalLength %.2X\n",
130 acpi_ut_get_resource_type(aml), length,
131 resource->length));
132
133 /* Point to the next structure in the output buffer */
134
135 *resource_ptr = ACPI_NEXT_RESOURCE(resource);
136 return_ACPI_STATUS(AE_OK);
137}
138
139/*******************************************************************************
140 *
141 * FUNCTION: acpi_rs_convert_resources_to_aml
142 *
143 * PARAMETERS: resource - Pointer to the resource linked list
144 * aml_size_needed - Calculated size of the byte stream
145 * needed from calling acpi_rs_get_aml_length()
146 * The size of the output_buffer is
147 * guaranteed to be >= aml_size_needed
148 * output_buffer - Pointer to the buffer that will
149 * contain the byte stream
150 *
151 * RETURN: Status
152 *
153 * DESCRIPTION: Takes the resource linked list and parses it, creating a
154 * byte stream of resources in the caller's output buffer
155 *
156 ******************************************************************************/
157
158acpi_status
159acpi_rs_convert_resources_to_aml(struct acpi_resource *resource,
160 acpi_size aml_size_needed, u8 * output_buffer)
161{
162 u8 *aml = output_buffer;
163 u8 *end_aml = output_buffer + aml_size_needed;
164 struct acpi_rsconvert_info *conversion_table;
165 acpi_status status;
166
167 ACPI_FUNCTION_TRACE(rs_convert_resources_to_aml);
168
169 /* Walk the resource descriptor list, convert each descriptor */
170
171 while (aml < end_aml) {
172
173 /* Validate the (internal) Resource Type */
174
175 if (resource->type > ACPI_RESOURCE_TYPE_MAX) {
176 ACPI_ERROR((AE_INFO,
177 "Invalid descriptor type (0x%X) in resource list",
178 resource->type));
179 return_ACPI_STATUS(AE_BAD_DATA);
180 }
181
182 /* Sanity check the length. It must not be zero, or we loop forever */
183
184 if (!resource->length) {
185 ACPI_ERROR((AE_INFO,
186 "Invalid zero length descriptor in resource list\n"));
187 return_ACPI_STATUS(AE_AML_BAD_RESOURCE_LENGTH);
188 }
189
190 /* Perform the conversion */
191
192 if (resource->type == ACPI_RESOURCE_TYPE_SERIAL_BUS) {
193 if (resource->data.common_serial_bus.type >
194 AML_RESOURCE_MAX_SERIALBUSTYPE) {
195 conversion_table = NULL;
196 } else {
197 /* This is an I2C, SPI, or UART serial_bus descriptor */
198
199 conversion_table =
200 acpi_gbl_convert_resource_serial_bus_dispatch
201 [resource->data.common_serial_bus.type];
202 }
203 } else {
204 conversion_table =
205 acpi_gbl_set_resource_dispatch[resource->type];
206 }
207
208 if (!conversion_table) {
209 ACPI_ERROR((AE_INFO,
210 "Invalid/unsupported resource descriptor: Type 0x%2.2X",
211 resource->type));
212 return_ACPI_STATUS(AE_AML_INVALID_RESOURCE_TYPE);
213 }
214
215 status = acpi_rs_convert_resource_to_aml(resource,
216 ACPI_CAST_PTR(union
217 aml_resource,
218 aml),
219 conversion_table);
220 if (ACPI_FAILURE(status)) {
221 ACPI_EXCEPTION((AE_INFO, status,
222 "Could not convert resource (type 0x%X) to AML",
223 resource->type));
224 return_ACPI_STATUS(status);
225 }
226
227 /* Perform final sanity check on the new AML resource descriptor */
228
229 status =
230 acpi_ut_validate_resource(NULL,
231 ACPI_CAST_PTR(union aml_resource,
232 aml), NULL);
233 if (ACPI_FAILURE(status)) {
234 return_ACPI_STATUS(status);
235 }
236
237 /* Check for end-of-list, normal exit */
238
239 if (resource->type == ACPI_RESOURCE_TYPE_END_TAG) {
240
241 /* An End Tag indicates the end of the input Resource Template */
242
243 return_ACPI_STATUS(AE_OK);
244 }
245
246 /*
247 * Extract the total length of the new descriptor and set the
248 * Aml to point to the next (output) resource descriptor
249 */
250 aml += acpi_ut_get_descriptor_length(aml);
251
252 /* Point to the next input resource descriptor */
253
254 resource = ACPI_NEXT_RESOURCE(resource);
255 }
256
257 /* Completed buffer, but did not find an end_tag resource descriptor */
258
259 return_ACPI_STATUS(AE_AML_NO_RESOURCE_END_TAG);
260}