drivers/acpi/acpica/rslist.c

   1 /*******************************************************************************
   2  *
   3  * Module Name: rslist - Linked list utilities
   4  *
   5  ******************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2013, 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         union aml_resource *aml_resource;
  74         struct acpi_rsconvert_info *conversion_table;
  75         acpi_status status;
  76
  77         ACPI_FUNCTION_TRACE(rs_convert_aml_to_resources);
  78
  79         /*
  80          * Check that the input buffer and all subsequent pointers into it
  81          * are aligned on a native word boundary. Most important on IA64
  82          */
  83         resource = *resource_ptr;
  84         if (ACPI_IS_MISALIGNED(resource)) {
  85                 ACPI_WARNING((AE_INFO,
  86                               "Misaligned resource pointer %p", resource));
  87         }
  88
  89         /* Get the appropriate conversion info table */
  90
  91         aml_resource = ACPI_CAST_PTR(union aml_resource, aml);
  92         if (acpi_ut_get_resource_type(aml) == ACPI_RESOURCE_NAME_SERIAL_BUS) {
  93                 if (aml_resource->common_serial_bus.type >
  94                     AML_RESOURCE_MAX_SERIALBUSTYPE) {
  95                         conversion_table = NULL;
  96                 } else {
  97                         /* This is an I2C, SPI, or UART serial_bus descriptor */
  98
  99                         conversion_table =
 100                             acpi_gbl_convert_resource_serial_bus_dispatch
 101                             [aml_resource->common_serial_bus.type];
 102                 }
 103         } else {
 104                 conversion_table =
 105                     acpi_gbl_get_resource_dispatch[resource_index];
 106         }
 107
 108         if (!conversion_table) {
 109                 ACPI_ERROR((AE_INFO,
 110                             "Invalid/unsupported resource descriptor: Type 0x%2.2X",
 111                             resource_index));
 112                 return_ACPI_STATUS(AE_AML_INVALID_RESOURCE_TYPE);
 113         }
 114
 115         /* Convert the AML byte stream resource to a local resource struct */
 116
 117         status =
 118             acpi_rs_convert_aml_to_resource(resource, aml_resource,
 119                                             conversion_table);
 120         if (ACPI_FAILURE(status)) {
 121                 ACPI_EXCEPTION((AE_INFO, status,
 122                                 "Could not convert AML resource (Type 0x%X)",
 123                                 *aml));
 124                 return_ACPI_STATUS(status);
 125         }
 126
 127         ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES,
 128                           "Type %.2X, AmlLength %.2X InternalLength %.2X\n",
 129                           acpi_ut_get_resource_type(aml), length,
 130                           resource->length));
 131
 132         /* Point to the next structure in the output buffer */
 133
 134         *resource_ptr = ACPI_NEXT_RESOURCE(resource);
 135         return_ACPI_STATUS(AE_OK);
 136 }
 137
 138 /*******************************************************************************
 139  *
 140  * FUNCTION:    acpi_rs_convert_resources_to_aml
 141  *
 142  * PARAMETERS:  resource            - Pointer to the resource linked list
 143  *              aml_size_needed     - Calculated size of the byte stream
 144  *                                    needed from calling acpi_rs_get_aml_length()
 145  *                                    The size of the output_buffer is
 146  *                                    guaranteed to be >= aml_size_needed
 147  *              output_buffer       - Pointer to the buffer that will
 148  *                                    contain the byte stream
 149  *
 150  * RETURN:      Status
 151  *
 152  * DESCRIPTION: Takes the resource linked list and parses it, creating a
 153  *              byte stream of resources in the caller's output buffer
 154  *
 155  ******************************************************************************/
 156
 157 acpi_status
 158 acpi_rs_convert_resources_to_aml(struct acpi_resource *resource,
 159                                  acpi_size aml_size_needed, u8 * output_buffer)
 160 {
 161         u8 *aml = output_buffer;
 162         u8 *end_aml = output_buffer + aml_size_needed;
 163         struct acpi_rsconvert_info *conversion_table;
 164         acpi_status status;
 165
 166         ACPI_FUNCTION_TRACE(rs_convert_resources_to_aml);
 167
 168         /* Walk the resource descriptor list, convert each descriptor */
 169
 170         while (aml < end_aml) {
 171
 172                 /* Validate the (internal) Resource Type */
 173
 174                 if (resource->type > ACPI_RESOURCE_TYPE_MAX) {
 175                         ACPI_ERROR((AE_INFO,
 176                                     "Invalid descriptor type (0x%X) in resource list",
 177                                     resource->type));
 178                         return_ACPI_STATUS(AE_BAD_DATA);
 179                 }
 180
 181                 /* Sanity check the length. It must not be zero, or we loop forever */
 182
 183                 if (!resource->length) {
 184                         ACPI_ERROR((AE_INFO,
 185                                     "Invalid zero length descriptor in resource list\n"));
 186                         return_ACPI_STATUS(AE_AML_BAD_RESOURCE_LENGTH);
 187                 }
 188
 189                 /* Perform the conversion */
 190
 191                 if (resource->type == ACPI_RESOURCE_TYPE_SERIAL_BUS) {
 192                         if (resource->data.common_serial_bus.type >
 193                             AML_RESOURCE_MAX_SERIALBUSTYPE) {
 194                                 conversion_table = NULL;
 195                         } else {
 196                                 /* This is an I2C, SPI, or UART serial_bus descriptor */
 197
 198                                 conversion_table =
 199                                     acpi_gbl_convert_resource_serial_bus_dispatch
 200                                     [resource->data.common_serial_bus.type];
 201                         }
 202                 } else {
 203                         conversion_table =
 204                             acpi_gbl_set_resource_dispatch[resource->type];
 205                 }
 206
 207                 if (!conversion_table) {
 208                         ACPI_ERROR((AE_INFO,
 209                                     "Invalid/unsupported resource descriptor: Type 0x%2.2X",
 210                                     resource->type));
 211                         return_ACPI_STATUS(AE_AML_INVALID_RESOURCE_TYPE);
 212                 }
 213
 214                 status = acpi_rs_convert_resource_to_aml(resource,
 215                                                          ACPI_CAST_PTR(union
 216                                                                        aml_resource,
 217                                                                        aml),
 218                                                          conversion_table);
 219                 if (ACPI_FAILURE(status)) {
 220                         ACPI_EXCEPTION((AE_INFO, status,
 221                                         "Could not convert resource (type 0x%X) to AML",
 222                                         resource->type));
 223                         return_ACPI_STATUS(status);
 224                 }
 225
 226                 /* Perform final sanity check on the new AML resource descriptor */
 227
 228                 status = acpi_ut_validate_resource(NULL,
 229                                                    ACPI_CAST_PTR(union
 230                                                                  aml_resource,
 231                                                                  aml), NULL);
 232                 if (ACPI_FAILURE(status)) {
 233                         return_ACPI_STATUS(status);
 234                 }
 235
 236                 /* Check for end-of-list, normal exit */
 237
 238                 if (resource->type == ACPI_RESOURCE_TYPE_END_TAG) {
 239
 240                         /* An End Tag indicates the end of the input Resource Template */
 241
 242                         return_ACPI_STATUS(AE_OK);
 243                 }
 244
 245                 /*
 246                  * Extract the total length of the new descriptor and set the
 247                  * Aml to point to the next (output) resource descriptor
 248                  */
 249                 aml += acpi_ut_get_descriptor_length(aml);
 250
 251                 /* Point to the next input resource descriptor */
 252
 253                 resource = ACPI_NEXT_RESOURCE(resource);
 254         }
 255
 256         /* Completed buffer, but did not find an end_tag resource descriptor */
 257
 258         return_ACPI_STATUS(AE_AML_NO_RESOURCE_END_TAG);
 259 }