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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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 * Check that the input buffer and all subsequent pointers into it
82 * are aligned on a native word boundary. Most important on IA64
84 if (ACPI_IS_MISALIGNED(resource)) {
85 ACPI_WARNING((AE_INFO,
86 "Misaligned resource pointer %p",
90 /* Validate the Resource Type and Resource Length */
92 status = acpi_ut_validate_resource(aml, &resource_index);
93 if (ACPI_FAILURE(status)) {
94 return_ACPI_STATUS(status);
97 /* Convert the AML byte stream resource to a local resource struct */
100 acpi_rs_convert_aml_to_resource(resource,
104 acpi_gbl_get_resource_dispatch
106 if (ACPI_FAILURE(status)) {
107 ACPI_EXCEPTION((AE_INFO, status,
108 "Could not convert AML resource (Type %X)",
110 return_ACPI_STATUS(status);
113 ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES,
114 "Type %.2X, Aml %.2X internal %.2X\n",
115 acpi_ut_get_resource_type(aml),
116 acpi_ut_get_descriptor_length(aml),
119 /* Normal exit on completion of an end_tag resource descriptor */
121 if (acpi_ut_get_resource_type(aml) ==
122 ACPI_RESOURCE_NAME_END_TAG) {
123 return_ACPI_STATUS(AE_OK);
126 /* Point to the next input AML resource */
128 aml += acpi_ut_get_descriptor_length(aml);
130 /* Point to the next structure in the output buffer */
133 ACPI_ADD_PTR(struct acpi_resource, resource,
137 /* Did not find an end_tag resource descriptor */
139 return_ACPI_STATUS(AE_AML_NO_RESOURCE_END_TAG);
142 /*******************************************************************************
144 * FUNCTION: acpi_rs_convert_resources_to_aml
146 * PARAMETERS: Resource - Pointer to the resource linked list
147 * aml_size_needed - Calculated size of the byte stream
148 * needed from calling acpi_rs_get_aml_length()
149 * The size of the output_buffer is
150 * guaranteed to be >= aml_size_needed
151 * output_buffer - Pointer to the buffer that will
152 * contain the byte stream
156 * DESCRIPTION: Takes the resource linked list and parses it, creating a
157 * byte stream of resources in the caller's output buffer
159 ******************************************************************************/
162 acpi_rs_convert_resources_to_aml(struct acpi_resource *resource,
163 acpi_size aml_size_needed, u8 * output_buffer)
165 u8 *aml = output_buffer;
166 u8 *end_aml = output_buffer + aml_size_needed;
169 ACPI_FUNCTION_TRACE("rs_convert_resources_to_aml");
171 /* Walk the resource descriptor list, convert each descriptor */
173 while (aml < end_aml) {
175 /* Validate the (internal) Resource Type */
177 if (resource->type > ACPI_RESOURCE_TYPE_MAX) {
179 "Invalid descriptor type (%X) in resource list",
181 return_ACPI_STATUS(AE_BAD_DATA);
184 /* Perform the conversion */
186 status = acpi_rs_convert_resource_to_aml(resource,
190 acpi_gbl_set_resource_dispatch
192 if (ACPI_FAILURE(status)) {
193 ACPI_EXCEPTION((AE_INFO, status,
194 "Could not convert resource (type %X) to AML",
196 return_ACPI_STATUS(status);
199 /* Perform final sanity check on the new AML resource descriptor */
202 acpi_ut_validate_resource(ACPI_CAST_PTR
203 (union aml_resource, aml), NULL);
204 if (ACPI_FAILURE(status)) {
205 return_ACPI_STATUS(status);
208 /* Check for end-of-list, normal exit */
210 if (resource->type == ACPI_RESOURCE_TYPE_END_TAG) {
212 /* An End Tag indicates the end of the input Resource Template */
214 return_ACPI_STATUS(AE_OK);
218 * Extract the total length of the new descriptor and set the
219 * Aml to point to the next (output) resource descriptor
221 aml += acpi_ut_get_descriptor_length(aml);
223 /* Point to the next input resource descriptor */
226 ACPI_ADD_PTR(struct acpi_resource, resource,
230 /* Completed buffer, but did not find an end_tag resource descriptor */
232 return_ACPI_STATUS(AE_AML_NO_RESOURCE_END_TAG);