1 // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
2 /*******************************************************************************
4 * Module Name: rslist - Linked list utilities
6 ******************************************************************************/
12 #define _COMPONENT ACPI_RESOURCES
13 ACPI_MODULE_NAME("rslist")
15 /*******************************************************************************
17 * FUNCTION: acpi_rs_convert_aml_to_resources
19 * PARAMETERS: acpi_walk_aml_callback
20 * resource_ptr - Pointer to the buffer that will
21 * contain the output structures
25 * DESCRIPTION: Convert an AML resource to an internal representation of the
26 * resource that is aligned and easier to access.
28 ******************************************************************************/
30 acpi_rs_convert_aml_to_resources(u8 * aml,
32 u32 offset, u8 resource_index, void **context)
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;
41 ACPI_FUNCTION_TRACE(rs_convert_aml_to_resources);
44 * Check that the input buffer and all subsequent pointers into it
45 * are aligned on a native word boundary. Most important on IA64
47 resource = *resource_ptr;
48 if (ACPI_IS_MISALIGNED(resource)) {
49 ACPI_WARNING((AE_INFO,
50 "Misaligned resource pointer %p", resource));
53 /* Get the appropriate conversion info table */
55 aml_resource = ACPI_CAST_PTR(union aml_resource, aml);
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;
62 /* This is an I2C, SPI, or UART serial_bus descriptor */
65 acpi_gbl_convert_resource_serial_bus_dispatch
66 [aml_resource->common_serial_bus.type];
70 acpi_gbl_get_resource_dispatch[resource_index];
73 if (!conversion_table) {
75 "Invalid/unsupported resource descriptor: Type 0x%2.2X",
77 return_ACPI_STATUS(AE_AML_INVALID_RESOURCE_TYPE);
80 /* Convert the AML byte stream resource to a local resource struct */
83 acpi_rs_convert_aml_to_resource(resource, aml_resource,
85 if (ACPI_FAILURE(status)) {
86 ACPI_EXCEPTION((AE_INFO, status,
87 "Could not convert AML resource (Type 0x%X)",
89 return_ACPI_STATUS(status);
92 ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES,
93 "Type %.2X, AmlLength %.2X InternalLength %.2X\n",
94 acpi_ut_get_resource_type(aml), length,
97 /* Point to the next structure in the output buffer */
99 *resource_ptr = ACPI_NEXT_RESOURCE(resource);
100 return_ACPI_STATUS(AE_OK);
103 /*******************************************************************************
105 * FUNCTION: acpi_rs_convert_resources_to_aml
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
117 * DESCRIPTION: Takes the resource linked list and parses it, creating a
118 * byte stream of resources in the caller's output buffer
120 ******************************************************************************/
123 acpi_rs_convert_resources_to_aml(struct acpi_resource *resource,
124 acpi_size aml_size_needed, u8 * output_buffer)
126 u8 *aml = output_buffer;
127 u8 *end_aml = output_buffer + aml_size_needed;
128 struct acpi_rsconvert_info *conversion_table;
131 ACPI_FUNCTION_TRACE(rs_convert_resources_to_aml);
133 /* Walk the resource descriptor list, convert each descriptor */
135 while (aml < end_aml) {
137 /* Validate the (internal) Resource Type */
139 if (resource->type > ACPI_RESOURCE_TYPE_MAX) {
141 "Invalid descriptor type (0x%X) in resource list",
143 return_ACPI_STATUS(AE_BAD_DATA);
146 /* Sanity check the length. It must not be zero, or we loop forever */
148 if (!resource->length) {
150 "Invalid zero length descriptor in resource list\n"));
151 return_ACPI_STATUS(AE_AML_BAD_RESOURCE_LENGTH);
154 /* Perform the conversion */
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;
161 /* This is an I2C, SPI, or UART serial_bus descriptor */
164 acpi_gbl_convert_resource_serial_bus_dispatch
165 [resource->data.common_serial_bus.type];
169 acpi_gbl_set_resource_dispatch[resource->type];
172 if (!conversion_table) {
174 "Invalid/unsupported resource descriptor: Type 0x%2.2X",
176 return_ACPI_STATUS(AE_AML_INVALID_RESOURCE_TYPE);
179 status = acpi_rs_convert_resource_to_aml(resource,
184 if (ACPI_FAILURE(status)) {
185 ACPI_EXCEPTION((AE_INFO, status,
186 "Could not convert resource (type 0x%X) to AML",
188 return_ACPI_STATUS(status);
191 /* Perform final sanity check on the new AML resource descriptor */
194 acpi_ut_validate_resource(NULL,
195 ACPI_CAST_PTR(union aml_resource,
197 if (ACPI_FAILURE(status)) {
198 return_ACPI_STATUS(status);
201 /* Check for end-of-list, normal exit */
203 if (resource->type == ACPI_RESOURCE_TYPE_END_TAG) {
205 /* An End Tag indicates the end of the input Resource Template */
207 return_ACPI_STATUS(AE_OK);
211 * Extract the total length of the new descriptor and set the
212 * Aml to point to the next (output) resource descriptor
214 aml += acpi_ut_get_descriptor_length(aml);
216 /* Point to the next input resource descriptor */
218 resource = ACPI_NEXT_RESOURCE(resource);
221 /* Completed buffer, but did not find an end_tag resource descriptor */
223 return_ACPI_STATUS(AE_AML_NO_RESOURCE_END_TAG);