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
13ACPI_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 ******************************************************************************/
29acpi_status
30acpi_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, UART, or CSI2 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: aml_resource,
84 info: 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 if (!resource->length) {
93 ACPI_EXCEPTION((AE_INFO, status,
94 "Zero-length resource returned from RsConvertAmlToResource"));
95 }
96
97 ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES,
98 "Type %.2X, AmlLength %.2X InternalLength %.2X\n",
99 acpi_ut_get_resource_type(aml), length,
100 resource->length));
101
102 /* Point to the next structure in the output buffer */
103
104 *resource_ptr = ACPI_NEXT_RESOURCE(resource);
105 return_ACPI_STATUS(AE_OK);
106}
107
108/*******************************************************************************
109 *
110 * FUNCTION: acpi_rs_convert_resources_to_aml
111 *
112 * PARAMETERS: resource - Pointer to the resource linked list
113 * aml_size_needed - Calculated size of the byte stream
114 * needed from calling acpi_rs_get_aml_length()
115 * The size of the output_buffer is
116 * guaranteed to be >= aml_size_needed
117 * output_buffer - Pointer to the buffer that will
118 * contain the byte stream
119 *
120 * RETURN: Status
121 *
122 * DESCRIPTION: Takes the resource linked list and parses it, creating a
123 * byte stream of resources in the caller's output buffer
124 *
125 ******************************************************************************/
126
127acpi_status
128acpi_rs_convert_resources_to_aml(struct acpi_resource *resource,
129 acpi_size aml_size_needed, u8 * output_buffer)
130{
131 u8 *aml = output_buffer;
132 u8 *end_aml = output_buffer + aml_size_needed;
133 struct acpi_rsconvert_info *conversion_table;
134 acpi_status status;
135
136 ACPI_FUNCTION_TRACE(rs_convert_resources_to_aml);
137
138 /* Walk the resource descriptor list, convert each descriptor */
139
140 while (aml < end_aml) {
141
142 /* Validate the (internal) Resource Type */
143
144 if (resource->type > ACPI_RESOURCE_TYPE_MAX) {
145 ACPI_ERROR((AE_INFO,
146 "Invalid descriptor type (0x%X) in resource list",
147 resource->type));
148 return_ACPI_STATUS(AE_BAD_DATA);
149 }
150
151 /* Sanity check the length. It must not be zero, or we loop forever */
152
153 if (!resource->length) {
154 ACPI_ERROR((AE_INFO,
155 "Invalid zero length descriptor in resource list\n"));
156 return_ACPI_STATUS(AE_AML_BAD_RESOURCE_LENGTH);
157 }
158
159 /* Perform the conversion */
160
161 if (resource->type == ACPI_RESOURCE_TYPE_SERIAL_BUS) {
162 if (resource->data.common_serial_bus.type >
163 AML_RESOURCE_MAX_SERIALBUSTYPE) {
164 conversion_table = NULL;
165 } else {
166 /* This is an I2C, SPI, UART or CSI2 serial_bus descriptor */
167
168 conversion_table =
169 acpi_gbl_convert_resource_serial_bus_dispatch
170 [resource->data.common_serial_bus.type];
171 }
172 } else {
173 conversion_table =
174 acpi_gbl_set_resource_dispatch[resource->type];
175 }
176
177 if (!conversion_table) {
178 ACPI_ERROR((AE_INFO,
179 "Invalid/unsupported resource descriptor: Type 0x%2.2X",
180 resource->type));
181 return_ACPI_STATUS(AE_AML_INVALID_RESOURCE_TYPE);
182 }
183
184 status = acpi_rs_convert_resource_to_aml(resource,
185 ACPI_CAST_PTR(union
186 aml_resource,
187 aml),
188 info: conversion_table);
189 if (ACPI_FAILURE(status)) {
190 ACPI_EXCEPTION((AE_INFO, status,
191 "Could not convert resource (type 0x%X) to AML",
192 resource->type));
193 return_ACPI_STATUS(status);
194 }
195
196 /* Perform final sanity check on the new AML resource descriptor */
197
198 status =
199 acpi_ut_validate_resource(NULL,
200 ACPI_CAST_PTR(union aml_resource,
201 aml), NULL);
202 if (ACPI_FAILURE(status)) {
203 return_ACPI_STATUS(status);
204 }
205
206 /* Check for end-of-list, normal exit */
207
208 if (resource->type == ACPI_RESOURCE_TYPE_END_TAG) {
209
210 /* An End Tag indicates the end of the input Resource Template */
211
212 return_ACPI_STATUS(AE_OK);
213 }
214
215 /*
216 * Extract the total length of the new descriptor and set the
217 * Aml to point to the next (output) resource descriptor
218 */
219 aml += acpi_ut_get_descriptor_length(aml);
220
221 /* Point to the next input resource descriptor */
222
223 resource = ACPI_NEXT_RESOURCE(resource);
224 }
225
226 /* Completed buffer, but did not find an end_tag resource descriptor */
227
228 return_ACPI_STATUS(AE_AML_NO_RESOURCE_END_TAG);
229}
230