1 /*******************************************************************************
3 * Module Name: rslist - Linked list utilities
5 ******************************************************************************/
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44 #include <acpi/acpi.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
61 * DESCRIPTION: Convert an AML resource to an internal representation of the
62 * resource that is aligned and easier to access.
64 ******************************************************************************/
66 acpi_rs_convert_aml_to_resources(u8
* aml
,
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 union aml_resource
*aml_resource
;
74 struct acpi_rsconvert_info
*conversion_table
;
77 ACPI_FUNCTION_TRACE(rs_convert_aml_to_resources
);
80 * Check that the input buffer and all subsequent pointers into it
81 * are aligned on a native word boundary. Most important on IA64
83 resource
= *resource_ptr
;
84 if (ACPI_IS_MISALIGNED(resource
)) {
85 ACPI_WARNING((AE_INFO
,
86 "Misaligned resource pointer %p", resource
));
89 /* Get the appropriate conversion info table */
91 aml_resource
= ACPI_CAST_PTR(union aml_resource
, aml
);
92 if (acpi_ut_get_resource_type(aml
) == ACPI_RESOURCE_NAME_SERIAL_BUS
) {
93 if (aml_resource
->common_serial_bus
.type
>
94 AML_RESOURCE_MAX_SERIALBUSTYPE
) {
95 conversion_table
= NULL
;
97 /* This is an I2C, SPI, or UART serial_bus descriptor */
100 acpi_gbl_convert_resource_serial_bus_dispatch
101 [aml_resource
->common_serial_bus
.type
];
105 acpi_gbl_get_resource_dispatch
[resource_index
];
108 if (!conversion_table
) {
110 "Invalid/unsupported resource descriptor: Type 0x%2.2X",
112 return_ACPI_STATUS(AE_AML_INVALID_RESOURCE_TYPE
);
115 /* Convert the AML byte stream resource to a local resource struct */
118 acpi_rs_convert_aml_to_resource(resource
, aml_resource
,
120 if (ACPI_FAILURE(status
)) {
121 ACPI_EXCEPTION((AE_INFO
, status
,
122 "Could not convert AML resource (Type 0x%X)",
124 return_ACPI_STATUS(status
);
127 ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES
,
128 "Type %.2X, AmlLength %.2X InternalLength %.2X\n",
129 acpi_ut_get_resource_type(aml
), length
,
132 /* Point to the next structure in the output buffer */
134 *resource_ptr
= ACPI_NEXT_RESOURCE(resource
);
135 return_ACPI_STATUS(AE_OK
);
138 /*******************************************************************************
140 * FUNCTION: acpi_rs_convert_resources_to_aml
142 * PARAMETERS: resource - Pointer to the resource linked list
143 * aml_size_needed - Calculated size of the byte stream
144 * needed from calling acpi_rs_get_aml_length()
145 * The size of the output_buffer is
146 * guaranteed to be >= aml_size_needed
147 * output_buffer - Pointer to the buffer that will
148 * contain the byte stream
152 * DESCRIPTION: Takes the resource linked list and parses it, creating a
153 * byte stream of resources in the caller's output buffer
155 ******************************************************************************/
158 acpi_rs_convert_resources_to_aml(struct acpi_resource
*resource
,
159 acpi_size aml_size_needed
, u8
* output_buffer
)
161 u8
*aml
= output_buffer
;
162 u8
*end_aml
= output_buffer
+ aml_size_needed
;
163 struct acpi_rsconvert_info
*conversion_table
;
166 ACPI_FUNCTION_TRACE(rs_convert_resources_to_aml
);
168 /* Walk the resource descriptor list, convert each descriptor */
170 while (aml
< end_aml
) {
172 /* Validate the (internal) Resource Type */
174 if (resource
->type
> ACPI_RESOURCE_TYPE_MAX
) {
176 "Invalid descriptor type (0x%X) in resource list",
178 return_ACPI_STATUS(AE_BAD_DATA
);
181 /* Sanity check the length. It must not be zero, or we loop forever */
183 if (!resource
->length
) {
185 "Invalid zero length descriptor in resource list\n"));
186 return_ACPI_STATUS(AE_AML_BAD_RESOURCE_LENGTH
);
189 /* Perform the conversion */
191 if (resource
->type
== ACPI_RESOURCE_TYPE_SERIAL_BUS
) {
192 if (resource
->data
.common_serial_bus
.type
>
193 AML_RESOURCE_MAX_SERIALBUSTYPE
) {
194 conversion_table
= NULL
;
196 /* This is an I2C, SPI, or UART serial_bus descriptor */
199 acpi_gbl_convert_resource_serial_bus_dispatch
200 [resource
->data
.common_serial_bus
.type
];
204 acpi_gbl_set_resource_dispatch
[resource
->type
];
207 if (!conversion_table
) {
209 "Invalid/unsupported resource descriptor: Type 0x%2.2X",
211 return_ACPI_STATUS(AE_AML_INVALID_RESOURCE_TYPE
);
214 status
= acpi_rs_convert_resource_to_aml(resource
,
219 if (ACPI_FAILURE(status
)) {
220 ACPI_EXCEPTION((AE_INFO
, status
,
221 "Could not convert resource (type 0x%X) to AML",
223 return_ACPI_STATUS(status
);
226 /* Perform final sanity check on the new AML resource descriptor */
228 status
= acpi_ut_validate_resource(NULL
,
232 if (ACPI_FAILURE(status
)) {
233 return_ACPI_STATUS(status
);
236 /* Check for end-of-list, normal exit */
238 if (resource
->type
== ACPI_RESOURCE_TYPE_END_TAG
) {
240 /* An End Tag indicates the end of the input Resource Template */
242 return_ACPI_STATUS(AE_OK
);
246 * Extract the total length of the new descriptor and set the
247 * Aml to point to the next (output) resource descriptor
249 aml
+= acpi_ut_get_descriptor_length(aml
);
251 /* Point to the next input resource descriptor */
253 resource
= ACPI_NEXT_RESOURCE(resource
);
256 /* Completed buffer, but did not find an end_tag resource descriptor */
258 return_ACPI_STATUS(AE_AML_NO_RESOURCE_END_TAG
);