1 /*******************************************************************************
3 * Module Name: rslist - Linked list utilities
5 ******************************************************************************/
8 * Copyright (C) 2000 - 2006, R. Byron Moore
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12 * modification, are permitted provided that the following conditions
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15 * notice, this list of conditions, and the following disclaimer,
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20 * including a substantially similar Disclaimer requirement for further
21 * binary redistribution.
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23 * of any contributors may be used to endorse or promote products derived
24 * from this software without specific prior written permission.
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
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44 #include <acpi/acpi.h>
45 #include <acpi/acresrc.h>
47 #define _COMPONENT ACPI_RESOURCES
48 ACPI_MODULE_NAME("rslist")
50 /*******************************************************************************
52 * FUNCTION: acpi_rs_convert_aml_to_resources
54 * PARAMETERS: Aml - Pointer to the resource byte stream
55 * aml_length - Length of Aml
56 * output_buffer - Pointer to the buffer that will
57 * contain the output structures
61 * DESCRIPTION: Takes the resource byte stream and parses it, creating a
62 * linked list of resources in the caller's output buffer
64 ******************************************************************************/
66 acpi_rs_convert_aml_to_resources(u8 * aml, u32 aml_length, u8 * output_buffer)
68 struct acpi_resource *resource = (void *)output_buffer;
73 ACPI_FUNCTION_TRACE("rs_convert_aml_to_resources");
75 end_aml = aml + aml_length;
77 /* Loop until end-of-buffer or an end_tag is found */
79 while (aml < end_aml) {
81 /* Validate the Resource Type and Resource Length */
83 status = acpi_ut_validate_resource(aml, &resource_index);
84 if (ACPI_FAILURE(status)) {
85 return_ACPI_STATUS(status);
88 /* Convert the AML byte stream resource to a local resource struct */
91 acpi_rs_convert_aml_to_resource(resource,
95 acpi_gbl_get_resource_dispatch
97 if (ACPI_FAILURE(status)) {
98 ACPI_EXCEPTION((AE_INFO, status,
99 "Could not convert AML resource (Type %X)",
101 return_ACPI_STATUS(status);
104 /* Normal exit on completion of an end_tag resource descriptor */
106 if (acpi_ut_get_resource_type(aml) ==
107 ACPI_RESOURCE_NAME_END_TAG) {
108 return_ACPI_STATUS(AE_OK);
111 /* Point to the next input AML resource */
113 aml += acpi_ut_get_descriptor_length(aml);
115 /* Point to the next structure in the output buffer */
118 ACPI_ADD_PTR(struct acpi_resource, resource,
122 /* Did not find an end_tag resource descriptor */
124 return_ACPI_STATUS(AE_AML_NO_RESOURCE_END_TAG);
127 /*******************************************************************************
129 * FUNCTION: acpi_rs_convert_resources_to_aml
131 * PARAMETERS: Resource - Pointer to the resource linked list
132 * aml_size_needed - Calculated size of the byte stream
133 * needed from calling acpi_rs_get_aml_length()
134 * The size of the output_buffer is
135 * guaranteed to be >= aml_size_needed
136 * output_buffer - Pointer to the buffer that will
137 * contain the byte stream
141 * DESCRIPTION: Takes the resource linked list and parses it, creating a
142 * byte stream of resources in the caller's output buffer
144 ******************************************************************************/
147 acpi_rs_convert_resources_to_aml(struct acpi_resource *resource,
148 acpi_size aml_size_needed, u8 * output_buffer)
150 u8 *aml = output_buffer;
151 u8 *end_aml = output_buffer + aml_size_needed;
154 ACPI_FUNCTION_TRACE("rs_convert_resources_to_aml");
156 /* Walk the resource descriptor list, convert each descriptor */
158 while (aml < end_aml) {
160 /* Validate the (internal) Resource Type */
162 if (resource->type > ACPI_RESOURCE_TYPE_MAX) {
164 "Invalid descriptor type (%X) in resource list",
166 return_ACPI_STATUS(AE_BAD_DATA);
169 /* Perform the conversion */
171 status = acpi_rs_convert_resource_to_aml(resource,
175 acpi_gbl_set_resource_dispatch
177 if (ACPI_FAILURE(status)) {
178 ACPI_EXCEPTION((AE_INFO, status,
179 "Could not convert resource (type %X) to AML",
181 return_ACPI_STATUS(status);
184 /* Perform final sanity check on the new AML resource descriptor */
187 acpi_ut_validate_resource(ACPI_CAST_PTR
188 (union aml_resource, aml), NULL);
189 if (ACPI_FAILURE(status)) {
190 return_ACPI_STATUS(status);
193 /* Check for end-of-list, normal exit */
195 if (resource->type == ACPI_RESOURCE_TYPE_END_TAG) {
197 /* An End Tag indicates the end of the input Resource Template */
199 return_ACPI_STATUS(AE_OK);
203 * Extract the total length of the new descriptor and set the
204 * Aml to point to the next (output) resource descriptor
206 aml += acpi_ut_get_descriptor_length(aml);
208 /* Point to the next input resource descriptor */
211 ACPI_ADD_PTR(struct acpi_resource, resource,
215 /* Completed buffer, but did not find an end_tag resource descriptor */
217 return_ACPI_STATUS(AE_AML_NO_RESOURCE_END_TAG);