1 /*******************************************************************************
3 * Module Name: rslist - Linked list utilities
5 ******************************************************************************/
8 * Copyright (C) 2000 - 2005, 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) {
80 /* Validate the Resource Type and Resource Length */
82 status = acpi_ut_validate_resource(aml, &resource_index);
83 if (ACPI_FAILURE(status)) {
84 return_ACPI_STATUS(status);
87 /* Convert the AML byte stream resource to a local resource struct */
90 acpi_rs_convert_aml_to_resource(resource,
94 acpi_gbl_get_resource_dispatch
96 if (ACPI_FAILURE(status)) {
97 ACPI_REPORT_ERROR(("Could not convert AML resource (Type %X) to resource, %s\n", *aml, acpi_format_exception(status)));
98 return_ACPI_STATUS(status);
101 /* Normal exit on completion of an end_tag resource descriptor */
103 if (acpi_ut_get_resource_type(aml) ==
104 ACPI_RESOURCE_NAME_END_TAG) {
105 return_ACPI_STATUS(AE_OK);
108 /* Point to the next input AML resource */
110 aml += acpi_ut_get_descriptor_length(aml);
112 /* Point to the next structure in the output buffer */
115 ACPI_ADD_PTR(struct acpi_resource, resource,
119 /* Did not find an end_tag resource descriptor */
121 return_ACPI_STATUS(AE_AML_NO_RESOURCE_END_TAG);
124 /*******************************************************************************
126 * FUNCTION: acpi_rs_convert_resources_to_aml
128 * PARAMETERS: Resource - Pointer to the resource linked list
129 * aml_size_needed - Calculated size of the byte stream
130 * needed from calling acpi_rs_get_aml_length()
131 * The size of the output_buffer is
132 * guaranteed to be >= aml_size_needed
133 * output_buffer - Pointer to the buffer that will
134 * contain the byte stream
138 * DESCRIPTION: Takes the resource linked list and parses it, creating a
139 * byte stream of resources in the caller's output buffer
141 ******************************************************************************/
144 acpi_rs_convert_resources_to_aml(struct acpi_resource *resource,
145 acpi_size aml_size_needed, u8 * output_buffer)
147 u8 *aml = output_buffer;
148 u8 *end_aml = output_buffer + aml_size_needed;
151 ACPI_FUNCTION_TRACE("rs_convert_resources_to_aml");
153 /* Walk the resource descriptor list, convert each descriptor */
155 while (aml < end_aml) {
156 /* Validate the (internal) Resource Type */
158 if (resource->type > ACPI_RESOURCE_TYPE_MAX) {
159 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
160 "Invalid descriptor type (%X) in resource list\n",
162 return_ACPI_STATUS(AE_BAD_DATA);
165 /* Perform the conversion */
167 status = acpi_rs_convert_resource_to_aml(resource,
171 acpi_gbl_set_resource_dispatch
173 if (ACPI_FAILURE(status)) {
174 ACPI_REPORT_ERROR(("Could not convert resource (type %X) to AML, %s\n", resource->type, acpi_format_exception(status)));
175 return_ACPI_STATUS(status);
178 /* Perform final sanity check on the new AML resource descriptor */
181 acpi_ut_validate_resource(ACPI_CAST_PTR
182 (union aml_resource, aml), NULL);
183 if (ACPI_FAILURE(status)) {
184 return_ACPI_STATUS(status);
187 /* Check for end-of-list, normal exit */
189 if (resource->type == ACPI_RESOURCE_TYPE_END_TAG) {
190 /* An End Tag indicates the end of the input Resource Template */
192 return_ACPI_STATUS(AE_OK);
196 * Extract the total length of the new descriptor and set the
197 * Aml to point to the next (output) resource descriptor
199 aml += acpi_ut_get_descriptor_length(aml);
201 /* Point to the next input resource descriptor */
204 ACPI_ADD_PTR(struct acpi_resource, resource,
208 /* Completed buffer, but did not find an end_tag resource descriptor */
210 return_ACPI_STATUS(AE_AML_NO_RESOURCE_END_TAG);