drivers/acpi/resources/rslist.c

   1 /*******************************************************************************
   2  *
   3  * Module Name: rslist - Linked list utilities
   4  *
   5  ******************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2007, R. Byron Moore
   9  * All rights reserved.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions, and the following disclaimer,
  16  *    without modification.
  17  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  18  *    substantially similar to the "NO WARRANTY" disclaimer below
  19  *    ("Disclaimer") and any redistribution must be conditioned upon
  20  *    including a substantially similar Disclaimer requirement for further
  21  *    binary redistribution.
  22  * 3. Neither the names of the above-listed copyright holders nor the names
  23  *    of any contributors may be used to endorse or promote products derived
  24  *    from this software without specific prior written permission.
  25  *
  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
  28  * Software Foundation.
  29  *
  30  * NO WARRANTY
  31  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  32  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  33  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  34  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  35  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  36  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  37  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  38  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  39  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  40  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  41  * POSSIBILITY OF SUCH DAMAGES.
  42  */
  43
  44 #include <acpi/acpi.h>
  45 #include <acpi/acresrc.h>
  46
  47 #define _COMPONENT          ACPI_RESOURCES
  48 ACPI_MODULE_NAME("rslist")
  49
  50 /*******************************************************************************
  51  *
  52  * FUNCTION:    acpi_rs_convert_aml_to_resources
  53  *
  54  * PARAMETERS:  acpi_walk_aml_callback
  55  *              resource_ptr            - Pointer to the buffer that will
  56  *                                        contain the output structures
  57  *
  58  * RETURN:      Status
  59  *
  60  * DESCRIPTION: Convert an AML resource to an internal representation of the
  61  *              resource that is aligned and easier to access.
  62  *
  63  ******************************************************************************/
  64 acpi_status
  65 acpi_rs_convert_aml_to_resources(u8 * aml,
  66                                  u32 length,
  67                                  u32 offset, u8 resource_index, void **context)
  68 {
  69         struct acpi_resource **resource_ptr =
  70             ACPI_CAST_INDIRECT_PTR(struct acpi_resource, context);
  71         struct acpi_resource *resource;
  72         acpi_status status;
  73
  74         ACPI_FUNCTION_TRACE(rs_convert_aml_to_resources);
  75
  76         /*
  77          * Check that the input buffer and all subsequent pointers into it
  78          * are aligned on a native word boundary. Most important on IA64
  79          */
  80         resource = *resource_ptr;
  81         if (ACPI_IS_MISALIGNED(resource)) {
  82                 ACPI_WARNING((AE_INFO,
  83                               "Misaligned resource pointer %p", resource));
  84         }
  85
  86         /* Convert the AML byte stream resource to a local resource struct */
  87
  88         status =
  89             acpi_rs_convert_aml_to_resource(resource,
  90                                             ACPI_CAST_PTR(union aml_resource,
  91                                                           aml),
  92                                             acpi_gbl_get_resource_dispatch
  93                                             [resource_index]);
  94         if (ACPI_FAILURE(status)) {
  95                 ACPI_EXCEPTION((AE_INFO, status,
  96                                 "Could not convert AML resource (Type %X)",
  97                                 *aml));
  98                 return_ACPI_STATUS(status);
  99         }
 100
 101         ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES,
 102                           "Type %.2X, AmlLength %.2X InternalLength %.2X\n",
 103                           acpi_ut_get_resource_type(aml), length,
 104                           resource->length));
 105
 106         /* Point to the next structure in the output buffer */
 107
 108         *resource_ptr = ACPI_ADD_PTR(void, resource, resource->length);
 109         return_ACPI_STATUS(AE_OK);
 110 }
 111
 112 /*******************************************************************************
 113  *
 114  * FUNCTION:    acpi_rs_convert_resources_to_aml
 115  *
 116  * PARAMETERS:  Resource            - Pointer to the resource linked list
 117  *              aml_size_needed     - Calculated size of the byte stream
 118  *                                    needed from calling acpi_rs_get_aml_length()
 119  *                                    The size of the output_buffer is
 120  *                                    guaranteed to be >= aml_size_needed
 121  *              output_buffer       - Pointer to the buffer that will
 122  *                                    contain the byte stream
 123  *
 124  * RETURN:      Status
 125  *
 126  * DESCRIPTION: Takes the resource linked list and parses it, creating a
 127  *              byte stream of resources in the caller's output buffer
 128  *
 129  ******************************************************************************/
 130
 131 acpi_status
 132 acpi_rs_convert_resources_to_aml(struct acpi_resource *resource,
 133                                  acpi_size aml_size_needed, u8 * output_buffer)
 134 {
 135         u8 *aml = output_buffer;
 136         u8 *end_aml = output_buffer + aml_size_needed;
 137         acpi_status status;
 138
 139         ACPI_FUNCTION_TRACE(rs_convert_resources_to_aml);
 140
 141         /* Walk the resource descriptor list, convert each descriptor */
 142
 143         while (aml < end_aml) {
 144
 145                 /* Validate the (internal) Resource Type */
 146
 147                 if (resource->type > ACPI_RESOURCE_TYPE_MAX) {
 148                         ACPI_ERROR((AE_INFO,
 149                                     "Invalid descriptor type (%X) in resource list",
 150                                     resource->type));
 151                         return_ACPI_STATUS(AE_BAD_DATA);
 152                 }
 153
 154                 /* Perform the conversion */
 155
 156                 status = acpi_rs_convert_resource_to_aml(resource, ACPI_CAST_PTR(union
 157                                                                                  aml_resource,
 158                                                                                  aml),
 159                                                          acpi_gbl_set_resource_dispatch
 160                                                          [resource->type]);
 161                 if (ACPI_FAILURE(status)) {
 162                         ACPI_EXCEPTION((AE_INFO, status,
 163                                         "Could not convert resource (type %X) to AML",
 164                                         resource->type));
 165                         return_ACPI_STATUS(status);
 166                 }
 167
 168                 /* Perform final sanity check on the new AML resource descriptor */
 169
 170                 status =
 171                     acpi_ut_validate_resource(ACPI_CAST_PTR
 172                                               (union aml_resource, aml), NULL);
 173                 if (ACPI_FAILURE(status)) {
 174                         return_ACPI_STATUS(status);
 175                 }
 176
 177                 /* Check for end-of-list, normal exit */
 178
 179                 if (resource->type == ACPI_RESOURCE_TYPE_END_TAG) {
 180
 181                         /* An End Tag indicates the end of the input Resource Template */
 182
 183                         return_ACPI_STATUS(AE_OK);
 184                 }
 185
 186                 /*
 187                  * Extract the total length of the new descriptor and set the
 188                  * Aml to point to the next (output) resource descriptor
 189                  */
 190                 aml += acpi_ut_get_descriptor_length(aml);
 191
 192                 /* Point to the next input resource descriptor */
 193
 194                 resource =
 195                     ACPI_ADD_PTR(struct acpi_resource, resource,
 196                                  resource->length);
 197         }
 198
 199         /* Completed buffer, but did not find an end_tag resource descriptor */
 200
 201         return_ACPI_STATUS(AE_AML_NO_RESOURCE_END_TAG);
 202 }