1 // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
2 /*******************************************************************************
3 *
4 * Module Name: rslist - Linked list utilities
5 *
6 ******************************************************************************/
7
8 #include <acpi/acpi.h>
9 #include "accommon.h"
10 #include "acresrc.h"
11
12 #define _COMPONENT ACPI_RESOURCES
13 ACPI_MODULE_NAME("rslist")
14
15 /*******************************************************************************
16 *
17 * FUNCTION: acpi_rs_convert_aml_to_resources
18 *
19 * PARAMETERS: acpi_walk_aml_callback
20 * resource_ptr - Pointer to the buffer that will
21 * contain the output structures
22 *
23 * RETURN: Status
24 *
25 * DESCRIPTION: Convert an AML resource to an internal representation of the
26 * resource that is aligned and easier to access.
27 *
28 ******************************************************************************/
29 acpi_status
30 acpi_rs_convert_aml_to_resources(u8 * aml,
31 u32 length,
32 u32 offset, u8 resource_index, void **context)
33 {
34 struct acpi_resource **resource_ptr =
35 ACPI_CAST_INDIRECT_PTR(struct acpi_resource, context);
36 struct acpi_resource *resource;
37 union aml_resource *aml_resource;
38 struct acpi_rsconvert_info *conversion_table;
39 acpi_status status;
40
41 ACPI_FUNCTION_TRACE(rs_convert_aml_to_resources);
42
43 /*
44 * Check that the input buffer and all subsequent pointers into it
45 * are aligned on a native word boundary. Most important on IA64
46 */
47 resource = *resource_ptr;
48 if (ACPI_IS_MISALIGNED(resource)) {
49 ACPI_WARNING((AE_INFO,
50 "Misaligned resource pointer %p", resource));
51 }
52
53 /* Get the appropriate conversion info table */
54
55 aml_resource = ACPI_CAST_PTR(union aml_resource, aml);
56
57 if (acpi_ut_get_resource_type(aml) == ACPI_RESOURCE_NAME_SERIAL_BUS) {
58 if (aml_resource->common_serial_bus.type >
59 AML_RESOURCE_MAX_SERIALBUSTYPE) {
60 conversion_table = NULL;
61 } else {
62 /* This is an I2C, SPI, or UART serial_bus descriptor */
63
64 conversion_table =
65 acpi_gbl_convert_resource_serial_bus_dispatch
66 [aml_resource->common_serial_bus.type];
67 }
68 } else {
69 conversion_table =
70 acpi_gbl_get_resource_dispatch[resource_index];
71 }
72
73 if (!conversion_table) {
74 ACPI_ERROR((AE_INFO,
75 "Invalid/unsupported resource descriptor: Type 0x%2.2X",
76 resource_index));
77 return_ACPI_STATUS(AE_AML_INVALID_RESOURCE_TYPE);
78 }
79
80 /* Convert the AML byte stream resource to a local resource struct */
81
82 status =
83 acpi_rs_convert_aml_to_resource(resource, aml_resource,
84 conversion_table);
85 if (ACPI_FAILURE(status)) {
86 ACPI_EXCEPTION((AE_INFO, status,
87 "Could not convert AML resource (Type 0x%X)",
88 *aml));
89 return_ACPI_STATUS(status);
90 }
91
92 ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES,
93 "Type %.2X, AmlLength %.2X InternalLength %.2X\n",
94 acpi_ut_get_resource_type(aml), length,
95 resource->length));
96
97 /* Point to the next structure in the output buffer */
98
99 *resource_ptr = ACPI_NEXT_RESOURCE(resource);
100 return_ACPI_STATUS(AE_OK);
101 }
102
103 /*******************************************************************************
104 *
105 * FUNCTION: acpi_rs_convert_resources_to_aml
106 *
107 * PARAMETERS: resource - Pointer to the resource linked list
108 * aml_size_needed - Calculated size of the byte stream
109 * needed from calling acpi_rs_get_aml_length()
110 * The size of the output_buffer is
111 * guaranteed to be >= aml_size_needed
112 * output_buffer - Pointer to the buffer that will
113 * contain the byte stream
114 *
115 * RETURN: Status
116 *
117 * DESCRIPTION: Takes the resource linked list and parses it, creating a
118 * byte stream of resources in the caller's output buffer
119 *
120 ******************************************************************************/
121
122 acpi_status
123 acpi_rs_convert_resources_to_aml(struct acpi_resource *resource,
124 acpi_size aml_size_needed, u8 * output_buffer)
125 {
126 u8 *aml = output_buffer;
127 u8 *end_aml = output_buffer + aml_size_needed;
128 struct acpi_rsconvert_info *conversion_table;
129 acpi_status status;
130
131 ACPI_FUNCTION_TRACE(rs_convert_resources_to_aml);
132
133 /* Walk the resource descriptor list, convert each descriptor */
134
135 while (aml < end_aml) {
136
137 /* Validate the (internal) Resource Type */
138
139 if (resource->type > ACPI_RESOURCE_TYPE_MAX) {
140 ACPI_ERROR((AE_INFO,
141 "Invalid descriptor type (0x%X) in resource list",
142 resource->type));
143 return_ACPI_STATUS(AE_BAD_DATA);
144 }
145
146 /* Sanity check the length. It must not be zero, or we loop forever */
147
148 if (!resource->length) {
149 ACPI_ERROR((AE_INFO,
150 "Invalid zero length descriptor in resource list\n"));
151 return_ACPI_STATUS(AE_AML_BAD_RESOURCE_LENGTH);
152 }
153
154 /* Perform the conversion */
155
156 if (resource->type == ACPI_RESOURCE_TYPE_SERIAL_BUS) {
157 if (resource->data.common_serial_bus.type >
158 AML_RESOURCE_MAX_SERIALBUSTYPE) {
159 conversion_table = NULL;
160 } else {
161 /* This is an I2C, SPI, or UART serial_bus descriptor */
162
163 conversion_table =
164 acpi_gbl_convert_resource_serial_bus_dispatch
165 [resource->data.common_serial_bus.type];
166 }
167 } else {
168 conversion_table =
169 acpi_gbl_set_resource_dispatch[resource->type];
170 }
171
172 if (!conversion_table) {
173 ACPI_ERROR((AE_INFO,
174 "Invalid/unsupported resource descriptor: Type 0x%2.2X",
175 resource->type));
176 return_ACPI_STATUS(AE_AML_INVALID_RESOURCE_TYPE);
177 }
178
179 status = acpi_rs_convert_resource_to_aml(resource,
180 ACPI_CAST_PTR(union
181 aml_resource,
182 aml),
183 conversion_table);
184 if (ACPI_FAILURE(status)) {
185 ACPI_EXCEPTION((AE_INFO, status,
186 "Could not convert resource (type 0x%X) to AML",
187 resource->type));
188 return_ACPI_STATUS(status);
189 }
190
191 /* Perform final sanity check on the new AML resource descriptor */
192
193 status =
194 acpi_ut_validate_resource(NULL,
195 ACPI_CAST_PTR(union aml_resource,
196 aml), NULL);
197 if (ACPI_FAILURE(status)) {
198 return_ACPI_STATUS(status);
199 }
200
201 /* Check for end-of-list, normal exit */
202
203 if (resource->type == ACPI_RESOURCE_TYPE_END_TAG) {
204
205 /* An End Tag indicates the end of the input Resource Template */
206
207 return_ACPI_STATUS(AE_OK);
208 }
209
210 /*
211 * Extract the total length of the new descriptor and set the
212 * Aml to point to the next (output) resource descriptor
213 */
214 aml += acpi_ut_get_descriptor_length(aml);
215
216 /* Point to the next input resource descriptor */
217
218 resource = ACPI_NEXT_RESOURCE(resource);
219 }
220
221 /* Completed buffer, but did not find an end_tag resource descriptor */
222
223 return_ACPI_STATUS(AE_AML_NO_RESOURCE_END_TAG);
224 }