git.oblomov.eu Git - linux-2.6/blob - drivers/acpi/resources/rscreate.c

   1 /*******************************************************************************
   2  *
   3  * Module Name: rscreate - Create resource lists/tables
   4  *
   5  ******************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2005, 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
  45 #include <acpi/acpi.h>
  46 #include <acpi/acresrc.h>
  47 #include <acpi/amlcode.h>
  48 #include <acpi/acnamesp.h>
  49
  50 #define _COMPONENT          ACPI_RESOURCES
  51          ACPI_MODULE_NAME    ("rscreate")
  52
  53
  54 /*******************************************************************************
  55  *
  56  * FUNCTION:    acpi_rs_create_resource_list
  57  *
  58  * PARAMETERS:  byte_stream_buffer      - Pointer to the resource byte stream
  59  *              output_buffer           - Pointer to the user's buffer
  60  *
  61  * RETURN:      Status  - AE_OK if okay, else a valid acpi_status code
  62  *              If output_buffer is not large enough, output_buffer_length
  63  *              indicates how large output_buffer should be, else it
  64  *              indicates how may u8 elements of output_buffer are valid.
  65  *
  66  * DESCRIPTION: Takes the byte stream returned from a _CRS, _PRS control method
  67  *              execution and parses the stream to create a linked list
  68  *              of device resources.
  69  *
  70  ******************************************************************************/
  71
  72 acpi_status
  73 acpi_rs_create_resource_list (
  74         union acpi_operand_object       *byte_stream_buffer,
  75         struct acpi_buffer              *output_buffer)
  76 {
  77
  78         acpi_status                     status;
  79         u8                              *byte_stream_start;
  80         acpi_size                       list_size_needed = 0;
  81         u32                             byte_stream_buffer_length;
  82
  83
  84         ACPI_FUNCTION_TRACE ("rs_create_resource_list");
  85
  86
  87         ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "byte_stream_buffer = %p\n",
  88                 byte_stream_buffer));
  89
  90         /*
  91          * Params already validated, so we don't re-validate here
  92          */
  93         byte_stream_buffer_length = byte_stream_buffer->buffer.length;
  94         byte_stream_start = byte_stream_buffer->buffer.pointer;
  95
  96         /*
  97          * Pass the byte_stream_buffer into a module that can calculate
  98          * the buffer size needed for the linked list
  99          */
 100         status = acpi_rs_get_list_length (byte_stream_start, byte_stream_buffer_length,
 101                          &list_size_needed);
 102
 103         ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Status=%X list_size_needed=%X\n",
 104                 status, (u32) list_size_needed));
 105         if (ACPI_FAILURE (status)) {
 106                 return_ACPI_STATUS (status);
 107         }
 108
 109         /* Validate/Allocate/Clear caller buffer */
 110
 111         status = acpi_ut_initialize_buffer (output_buffer, list_size_needed);
 112         if (ACPI_FAILURE (status)) {
 113                 return_ACPI_STATUS (status);
 114         }
 115
 116         /* Do the conversion */
 117
 118         status = acpi_rs_byte_stream_to_list (byte_stream_start, byte_stream_buffer_length,
 119                           output_buffer->pointer);
 120         if (ACPI_FAILURE (status)) {
 121                 return_ACPI_STATUS (status);
 122         }
 123
 124         ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "output_buffer %p Length %X\n",
 125                         output_buffer->pointer, (u32) output_buffer->length));
 126         return_ACPI_STATUS (AE_OK);
 127 }
 128
 129
 130 /*******************************************************************************
 131  *
 132  * FUNCTION:    acpi_rs_create_pci_routing_table
 133  *
 134  * PARAMETERS:  package_object          - Pointer to an union acpi_operand_object
 135  *                                        package
 136  *              output_buffer           - Pointer to the user's buffer
 137  *
 138  * RETURN:      Status  AE_OK if okay, else a valid acpi_status code.
 139  *              If the output_buffer is too small, the error will be
 140  *              AE_BUFFER_OVERFLOW and output_buffer->Length will point
 141  *              to the size buffer needed.
 142  *
 143  * DESCRIPTION: Takes the union acpi_operand_object    package and creates a
 144  *              linked list of PCI interrupt descriptions
 145  *
 146  * NOTE: It is the caller's responsibility to ensure that the start of the
 147  * output buffer is aligned properly (if necessary).
 148  *
 149  ******************************************************************************/
 150
 151 acpi_status
 152 acpi_rs_create_pci_routing_table (
 153         union acpi_operand_object       *package_object,
 154         struct acpi_buffer              *output_buffer)
 155 {
 156         u8                              *buffer;
 157         union acpi_operand_object       **top_object_list;
 158         union acpi_operand_object       **sub_object_list;
 159         union acpi_operand_object       *obj_desc;
 160         acpi_size                       buffer_size_needed = 0;
 161         u32                             number_of_elements;
 162         u32                             index;
 163         struct acpi_pci_routing_table   *user_prt;
 164         struct acpi_namespace_node      *node;
 165         acpi_status                     status;
 166         struct acpi_buffer              path_buffer;
 167
 168
 169         ACPI_FUNCTION_TRACE ("rs_create_pci_routing_table");
 170
 171
 172         /* Params already validated, so we don't re-validate here */
 173
 174         /*
 175          * Get the required buffer length
 176          */
 177         status = acpi_rs_get_pci_routing_table_length (package_object,
 178                          &buffer_size_needed);
 179         if (ACPI_FAILURE (status)) {
 180                 return_ACPI_STATUS (status);
 181         }
 182
 183         ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "buffer_size_needed = %X\n",
 184                 (u32) buffer_size_needed));
 185
 186         /* Validate/Allocate/Clear caller buffer */
 187
 188         status = acpi_ut_initialize_buffer (output_buffer, buffer_size_needed);
 189         if (ACPI_FAILURE (status)) {
 190                 return_ACPI_STATUS (status);
 191         }
 192
 193         /*
 194          * Loop through the ACPI_INTERNAL_OBJECTS - Each object
 195          * should be a package that in turn contains an
 196          * acpi_integer Address, a u8 Pin, a Name and a u8 source_index.
 197          */
 198         top_object_list  = package_object->package.elements;
 199         number_of_elements = package_object->package.count;
 200         buffer           = output_buffer->pointer;
 201         user_prt         = ACPI_CAST_PTR (struct acpi_pci_routing_table, buffer);
 202
 203         for (index = 0; index < number_of_elements; index++) {
 204                 /*
 205                  * Point user_prt past this current structure
 206                  *
 207                  * NOTE: On the first iteration, user_prt->Length will
 208                  * be zero because we cleared the return buffer earlier
 209                  */
 210                 buffer += user_prt->length;
 211                 user_prt = ACPI_CAST_PTR (struct acpi_pci_routing_table, buffer);
 212
 213                 /*
 214                  * Fill in the Length field with the information we have at this point.
 215                  * The minus four is to subtract the size of the u8 Source[4] member
 216                  * because it is added below.
 217                  */
 218                 user_prt->length = (sizeof (struct acpi_pci_routing_table) - 4);
 219
 220                 /*
 221                  * Each element of the top-level package must also be a package
 222                  */
 223                 if (ACPI_GET_OBJECT_TYPE (*top_object_list) != ACPI_TYPE_PACKAGE) {
 224                         ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
 225                                 "(PRT[%X]) Need sub-package, found %s\n",
 226                                 index, acpi_ut_get_object_type_name (*top_object_list)));
 227                         return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
 228                 }
 229
 230                 /* Each sub-package must be of length 4 */
 231
 232                 if ((*top_object_list)->package.count != 4) {
 233                         ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
 234                                 "(PRT[%X]) Need package of length 4, found length %d\n",
 235                                 index, (*top_object_list)->package.count));
 236                         return_ACPI_STATUS (AE_AML_PACKAGE_LIMIT);
 237                 }
 238
 239                 /*
 240                  * Dereference the sub-package.
 241                  * The sub_object_list will now point to an array of the four IRQ
 242                  * elements: [Address, Pin, Source, source_index]
 243                  */
 244                 sub_object_list = (*top_object_list)->package.elements;
 245
 246                 /*
 247                  * 1) First subobject: Dereference the PRT.Address
 248                  */
 249                 obj_desc = sub_object_list[0];
 250                 if (ACPI_GET_OBJECT_TYPE (obj_desc) == ACPI_TYPE_INTEGER) {
 251                         user_prt->address = obj_desc->integer.value;
 252                 }
 253                 else {
 254                         ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
 255                                 "(PRT[%X].Address) Need Integer, found %s\n",
 256                                 index, acpi_ut_get_object_type_name (obj_desc)));
 257                         return_ACPI_STATUS (AE_BAD_DATA);
 258                 }
 259
 260                 /*
 261                  * 2) Second subobject: Dereference the PRT.Pin
 262                  */
 263                 obj_desc = sub_object_list[1];
 264                 if (ACPI_GET_OBJECT_TYPE (obj_desc) == ACPI_TYPE_INTEGER) {
 265                         user_prt->pin = (u32) obj_desc->integer.value;
 266                 }
 267                 else {
 268                         ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
 269                                 "(PRT[%X].Pin) Need Integer, found %s\n",
 270                                 index, acpi_ut_get_object_type_name (obj_desc)));
 271                         return_ACPI_STATUS (AE_BAD_DATA);
 272                 }
 273
 274                 /*
 275                  * 3) Third subobject: Dereference the PRT.source_name
 276                  */
 277                 obj_desc = sub_object_list[2];
 278                 switch (ACPI_GET_OBJECT_TYPE (obj_desc)) {
 279                 case ACPI_TYPE_LOCAL_REFERENCE:
 280
 281                         if (obj_desc->reference.opcode != AML_INT_NAMEPATH_OP) {
 282                                 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
 283                                         "(PRT[%X].Source) Need name, found reference op %X\n",
 284                                         index, obj_desc->reference.opcode));
 285                                 return_ACPI_STATUS (AE_BAD_DATA);
 286                         }
 287
 288                         node = obj_desc->reference.node;
 289
 290                         /* Use *remaining* length of the buffer as max for pathname */
 291
 292                         path_buffer.length = output_buffer->length -
 293                                            (u32) ((u8 *) user_prt->source -
 294                                            (u8 *) output_buffer->pointer);
 295                         path_buffer.pointer = user_prt->source;
 296
 297                         status = acpi_ns_handle_to_pathname ((acpi_handle) node, &path_buffer);
 298
 299                         user_prt->length += (u32) ACPI_STRLEN (user_prt->source) + 1; /* include null terminator */
 300                         break;
 301
 302
 303                 case ACPI_TYPE_STRING:
 304
 305                         ACPI_STRCPY (user_prt->source, obj_desc->string.pointer);
 306
 307                         /* Add to the Length field the length of the string (add 1 for terminator) */
 308
 309                         user_prt->length += obj_desc->string.length + 1;
 310                         break;
 311
 312
 313                 case ACPI_TYPE_INTEGER:
 314                         /*
 315                          * If this is a number, then the Source Name is NULL, since the
 316                          * entire buffer was zeroed out, we can leave this alone.
 317                          *
 318                          * Add to the Length field the length of the u32 NULL
 319                          */
 320                         user_prt->length += sizeof (u32);
 321                         break;
 322
 323
 324                 default:
 325
 326                    ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
 327                            "(PRT[%X].Source) Need Ref/String/Integer, found %s\n",
 328                                 index, acpi_ut_get_object_type_name (obj_desc)));
 329                    return_ACPI_STATUS (AE_BAD_DATA);
 330                 }
 331
 332                 /* Now align the current length */
 333
 334                 user_prt->length = (u32) ACPI_ROUND_UP_to_64_bITS (user_prt->length);
 335
 336                 /*
 337                  * 4) Fourth subobject: Dereference the PRT.source_index
 338                  */
 339                 obj_desc = sub_object_list[3];
 340                 if (ACPI_GET_OBJECT_TYPE (obj_desc) == ACPI_TYPE_INTEGER) {
 341                         user_prt->source_index = (u32) obj_desc->integer.value;
 342                 }
 343                 else {
 344                         ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
 345                                 "(PRT[%X].source_index) Need Integer, found %s\n",
 346                                 index, acpi_ut_get_object_type_name (obj_desc)));
 347                         return_ACPI_STATUS (AE_BAD_DATA);
 348                 }
 349
 350                 /* Point to the next union acpi_operand_object in the top level package */
 351
 352                 top_object_list++;
 353         }
 354
 355         ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "output_buffer %p Length %X\n",
 356                         output_buffer->pointer, (u32) output_buffer->length));
 357         return_ACPI_STATUS (AE_OK);
 358 }
 359
 360
 361 /*******************************************************************************
 362  *
 363  * FUNCTION:    acpi_rs_create_byte_stream
 364  *
 365  * PARAMETERS:  linked_list_buffer      - Pointer to the resource linked list
 366  *              output_buffer           - Pointer to the user's buffer
 367  *
 368  * RETURN:      Status  AE_OK if okay, else a valid acpi_status code.
 369  *              If the output_buffer is too small, the error will be
 370  *              AE_BUFFER_OVERFLOW and output_buffer->Length will point
 371  *              to the size buffer needed.
 372  *
 373  * DESCRIPTION: Takes the linked list of device resources and
 374  *              creates a bytestream to be used as input for the
 375  *              _SRS control method.
 376  *
 377  ******************************************************************************/
 378
 379 acpi_status
 380 acpi_rs_create_byte_stream (
 381         struct acpi_resource            *linked_list_buffer,
 382         struct acpi_buffer              *output_buffer)
 383 {
 384         acpi_status                     status;
 385         acpi_size                       byte_stream_size_needed = 0;
 386
 387
 388         ACPI_FUNCTION_TRACE ("rs_create_byte_stream");
 389
 390
 391         ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "linked_list_buffer = %p\n",
 392                 linked_list_buffer));
 393
 394         /*
 395          * Params already validated, so we don't re-validate here
 396          *
 397          * Pass the linked_list_buffer into a module that calculates
 398          * the buffer size needed for the byte stream.
 399          */
 400         status = acpi_rs_get_byte_stream_length (linked_list_buffer,
 401                          &byte_stream_size_needed);
 402
 403         ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "byte_stream_size_needed=%X, %s\n",
 404                 (u32) byte_stream_size_needed, acpi_format_exception (status)));
 405         if (ACPI_FAILURE (status)) {
 406                 return_ACPI_STATUS (status);
 407         }
 408
 409         /* Validate/Allocate/Clear caller buffer */
 410
 411         status = acpi_ut_initialize_buffer (output_buffer, byte_stream_size_needed);
 412         if (ACPI_FAILURE (status)) {
 413                 return_ACPI_STATUS (status);
 414         }
 415
 416         /* Do the conversion */
 417
 418         status = acpi_rs_list_to_byte_stream (linked_list_buffer, byte_stream_size_needed,
 419                           output_buffer->pointer);
 420         if (ACPI_FAILURE (status)) {
 421                 return_ACPI_STATUS (status);
 422         }
 423
 424         ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "output_buffer %p Length %X\n",
 425                         output_buffer->pointer, (u32) output_buffer->length));
 426         return_ACPI_STATUS (AE_OK);
 427 }
 428