drivers/acpi/resources/rslist.c

   1 /*******************************************************************************
   2  *
   3  * Module Name: rslist - Linked list utilities
   4  *
   5  ******************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2006, 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,
  68                                  u8 resource_index, void **resource_ptr)
  69 {
  70         struct acpi_resource *resource = *resource_ptr;
  71         acpi_status status;
  72
  73         ACPI_FUNCTION_TRACE("rs_convert_aml_to_resources");
  74
  75         /*
  76          * Check that the input buffer and all subsequent pointers into it
  77          * are aligned on a native word boundary. Most important on IA64
  78          */
  79         if (ACPI_IS_MISALIGNED(resource)) {
  80                 ACPI_WARNING((AE_INFO,
  81                               "Misaligned resource pointer %p", resource));
  82         }
  83
  84         /* Convert the AML byte stream resource to a local resource struct */
  85
  86         status =
  87             acpi_rs_convert_aml_to_resource(resource,
  88                                             ACPI_CAST_PTR(union aml_resource,
  89                                                           aml),
  90                                             acpi_gbl_get_resource_dispatch
  91                                             [resource_index]);
  92         if (ACPI_FAILURE(status)) {
  93                 ACPI_EXCEPTION((AE_INFO, status,
  94                                 "Could not convert AML resource (Type %X)",
  95                                 *aml));
  96                 return_ACPI_STATUS(status);
  97         }
  98
  99         ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES,
 100                           "Type %.2X, aml_length %.2X internal_length %.2X\n",
 101                           acpi_ut_get_resource_type(aml), length,
 102                           resource->length));
 103
 104         /* Point to the next structure in the output buffer */
 105
 106         *resource_ptr = ACPI_ADD_PTR(void, resource, resource->length);
 107         return_ACPI_STATUS(AE_OK);
 108 }
 109
 110 /*******************************************************************************
 111  *
 112  * FUNCTION:    acpi_rs_convert_resources_to_aml
 113  *
 114  * PARAMETERS:  Resource            - Pointer to the resource linked list
 115  *              aml_size_needed     - Calculated size of the byte stream
 116  *                                    needed from calling acpi_rs_get_aml_length()
 117  *                                    The size of the output_buffer is
 118  *                                    guaranteed to be >= aml_size_needed
 119  *              output_buffer       - Pointer to the buffer that will
 120  *                                    contain the byte stream
 121  *
 122  * RETURN:      Status
 123  *
 124  * DESCRIPTION: Takes the resource linked list and parses it, creating a
 125  *              byte stream of resources in the caller's output buffer
 126  *
 127  ******************************************************************************/
 128
 129 acpi_status
 130 acpi_rs_convert_resources_to_aml(struct acpi_resource *resource,
 131                                  acpi_size aml_size_needed, u8 * output_buffer)
 132 {
 133         u8 *aml = output_buffer;
 134         u8 *end_aml = output_buffer + aml_size_needed;
 135         acpi_status status;
 136
 137         ACPI_FUNCTION_TRACE("rs_convert_resources_to_aml");
 138
 139         /* Walk the resource descriptor list, convert each descriptor */
 140
 141         while (aml < end_aml) {
 142
 143                 /* Validate the (internal) Resource Type */
 144
 145                 if (resource->type > ACPI_RESOURCE_TYPE_MAX) {
 146                         ACPI_ERROR((AE_INFO,
 147                                     "Invalid descriptor type (%X) in resource list",
 148                                     resource->type));
 149                         return_ACPI_STATUS(AE_BAD_DATA);
 150                 }
 151
 152                 /* Perform the conversion */
 153
 154                 status = acpi_rs_convert_resource_to_aml(resource,
 155                                                          ACPI_CAST_PTR(union
 156                                                                        aml_resource,
 157                                                                        aml),
 158                                                          acpi_gbl_set_resource_dispatch
 159                                                          [resource->type]);
 160                 if (ACPI_FAILURE(status)) {
 161                         ACPI_EXCEPTION((AE_INFO, status,
 162                                         "Could not convert resource (type %X) to AML",
 163                                         resource->type));
 164                         return_ACPI_STATUS(status);
 165                 }
 166
 167                 /* Perform final sanity check on the new AML resource descriptor */
 168
 169                 status =
 170                     acpi_ut_validate_resource(ACPI_CAST_PTR
 171                                               (union aml_resource, aml), NULL);
 172                 if (ACPI_FAILURE(status)) {
 173                         return_ACPI_STATUS(status);
 174                 }
 175
 176                 /* Check for end-of-list, normal exit */
 177
 178                 if (resource->type == ACPI_RESOURCE_TYPE_END_TAG) {
 179
 180                         /* An End Tag indicates the end of the input Resource Template */
 181
 182                         return_ACPI_STATUS(AE_OK);
 183                 }
 184
 185                 /*
 186                  * Extract the total length of the new descriptor and set the
 187                  * Aml to point to the next (output) resource descriptor
 188                  */
 189                 aml += acpi_ut_get_descriptor_length(aml);
 190
 191                 /* Point to the next input resource descriptor */
 192
 193                 resource =
 194                     ACPI_ADD_PTR(struct acpi_resource, resource,
 195                                  resource->length);
 196         }
 197
 198         /* Completed buffer, but did not find an end_tag resource descriptor */
 199
 200         return_ACPI_STATUS(AE_AML_NO_RESOURCE_END_TAG);
 201 }