drivers/acpi/acpica/rslist.c

   1 /*******************************************************************************
   2  *
   3  * Module Name: rslist - Linked list utilities
   4  *
   5  ******************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2011, Intel Corp.
   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 "accommon.h"
  46 #include "acresrc.h"
  47
  48 #define _COMPONENT          ACPI_RESOURCES
  49 ACPI_MODULE_NAME("rslist")
  50
  51 /*******************************************************************************
  52  *
  53  * FUNCTION:    acpi_rs_convert_aml_to_resources
  54  *
  55  * PARAMETERS:  acpi_walk_aml_callback
  56  *              resource_ptr            - Pointer to the buffer that will
  57  *                                        contain the output structures
  58  *
  59  * RETURN:      Status
  60  *
  61  * DESCRIPTION: Convert an AML resource to an internal representation of the
  62  *              resource that is aligned and easier to access.
  63  *
  64  ******************************************************************************/
  65 acpi_status
  66 acpi_rs_convert_aml_to_resources(u8 * aml,
  67                                  u32 length,
  68                                  u32 offset, u8 resource_index, void **context)
  69 {
  70         struct acpi_resource **resource_ptr =
  71             ACPI_CAST_INDIRECT_PTR(struct acpi_resource, context);
  72         struct acpi_resource *resource;
  73         acpi_status status;
  74
  75         ACPI_FUNCTION_TRACE(rs_convert_aml_to_resources);
  76
  77         /*
  78          * Check that the input buffer and all subsequent pointers into it
  79          * are aligned on a native word boundary. Most important on IA64
  80          */
  81         resource = *resource_ptr;
  82         if (ACPI_IS_MISALIGNED(resource)) {
  83                 ACPI_WARNING((AE_INFO,
  84                               "Misaligned resource pointer %p", resource));
  85         }
  86
  87         /* Convert the AML byte stream resource to a local resource struct */
  88
  89         status =
  90             acpi_rs_convert_aml_to_resource(resource,
  91                                             ACPI_CAST_PTR(union aml_resource,
  92                                                           aml),
  93                                             acpi_gbl_get_resource_dispatch
  94                                             [resource_index]);
  95         if (ACPI_FAILURE(status)) {
  96                 ACPI_EXCEPTION((AE_INFO, status,
  97                                 "Could not convert AML resource (Type 0x%X)",
  98                                 *aml));
  99                 return_ACPI_STATUS(status);
 100         }
 101
 102         ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES,
 103                           "Type %.2X, AmlLength %.2X InternalLength %.2X\n",
 104                           acpi_ut_get_resource_type(aml), length,
 105                           resource->length));
 106
 107         /* Point to the next structure in the output buffer */
 108
 109         *resource_ptr = ACPI_ADD_PTR(void, resource, resource->length);
 110         return_ACPI_STATUS(AE_OK);
 111 }
 112
 113 /*******************************************************************************
 114  *
 115  * FUNCTION:    acpi_rs_convert_resources_to_aml
 116  *
 117  * PARAMETERS:  Resource            - Pointer to the resource linked list
 118  *              aml_size_needed     - Calculated size of the byte stream
 119  *                                    needed from calling acpi_rs_get_aml_length()
 120  *                                    The size of the output_buffer is
 121  *                                    guaranteed to be >= aml_size_needed
 122  *              output_buffer       - Pointer to the buffer that will
 123  *                                    contain the byte stream
 124  *
 125  * RETURN:      Status
 126  *
 127  * DESCRIPTION: Takes the resource linked list and parses it, creating a
 128  *              byte stream of resources in the caller's output buffer
 129  *
 130  ******************************************************************************/
 131
 132 acpi_status
 133 acpi_rs_convert_resources_to_aml(struct acpi_resource *resource,
 134                                  acpi_size aml_size_needed, u8 * output_buffer)
 135 {
 136         u8 *aml = output_buffer;
 137         u8 *end_aml = output_buffer + aml_size_needed;
 138         acpi_status status;
 139
 140         ACPI_FUNCTION_TRACE(rs_convert_resources_to_aml);
 141
 142         /* Walk the resource descriptor list, convert each descriptor */
 143
 144         while (aml < end_aml) {
 145
 146                 /* Validate the (internal) Resource Type */
 147
 148                 if (resource->type > ACPI_RESOURCE_TYPE_MAX) {
 149                         ACPI_ERROR((AE_INFO,
 150                                     "Invalid descriptor type (0x%X) in resource list",
 151                                     resource->type));
 152                         return_ACPI_STATUS(AE_BAD_DATA);
 153                 }
 154
 155                 /* Perform the conversion */
 156
 157                 status = acpi_rs_convert_resource_to_aml(resource, ACPI_CAST_PTR(union
 158                                                                                  aml_resource,
 159                                                                                  aml),
 160                                                          acpi_gbl_set_resource_dispatch
 161                                                          [resource->type]);
 162                 if (ACPI_FAILURE(status)) {
 163                         ACPI_EXCEPTION((AE_INFO, status,
 164                                         "Could not convert resource (type 0x%X) to AML",
 165                                         resource->type));
 166                         return_ACPI_STATUS(status);
 167                 }
 168
 169                 /* Perform final sanity check on the new AML resource descriptor */
 170
 171                 status =
 172                     acpi_ut_validate_resource(ACPI_CAST_PTR
 173                                               (union aml_resource, aml), NULL);
 174                 if (ACPI_FAILURE(status)) {
 175                         return_ACPI_STATUS(status);
 176                 }
 177
 178                 /* Check for end-of-list, normal exit */
 179
 180                 if (resource->type == ACPI_RESOURCE_TYPE_END_TAG) {
 181
 182                         /* An End Tag indicates the end of the input Resource Template */
 183
 184                         return_ACPI_STATUS(AE_OK);
 185                 }
 186
 187                 /*
 188                  * Extract the total length of the new descriptor and set the
 189                  * Aml to point to the next (output) resource descriptor
 190                  */
 191                 aml += acpi_ut_get_descriptor_length(aml);
 192
 193                 /* Point to the next input resource descriptor */
 194
 195                 resource =
 196                     ACPI_ADD_PTR(struct acpi_resource, resource,
 197                                  resource->length);
 198         }
 199
 200         /* Completed buffer, but did not find an end_tag resource descriptor */
 201
 202         return_ACPI_STATUS(AE_AML_NO_RESOURCE_END_TAG);
 203 }