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

   1 /*******************************************************************************
   2  *
   3  * Module Name: rslist - Linked list utilities
   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
  48 #define _COMPONENT          ACPI_RESOURCES
  49          ACPI_MODULE_NAME    ("rslist")
  50
  51
  52 /*******************************************************************************
  53  *
  54  * FUNCTION:    acpi_rs_get_resource_type
  55  *
  56  * PARAMETERS:  resource_start_byte     - Byte 0 of a resource descriptor
  57  *
  58  * RETURN:      The Resource Type with no extraneous bits
  59  *
  60  * DESCRIPTION: Extract the Resource Type/Name from the first byte of
  61  *              a resource descriptor.
  62  *
  63  ******************************************************************************/
  64
  65 u8
  66 acpi_rs_get_resource_type (
  67         u8                              resource_start_byte)
  68 {
  69
  70         ACPI_FUNCTION_ENTRY ();
  71
  72
  73         /* Determine if this is a small or large resource */
  74
  75         switch (resource_start_byte & ACPI_RDESC_TYPE_MASK) {
  76         case ACPI_RDESC_TYPE_SMALL:
  77
  78                 /* Small Resource Type -- Only bits 6:3 are valid */
  79
  80                 return ((u8) (resource_start_byte & ACPI_RDESC_SMALL_MASK));
  81
  82
  83         case ACPI_RDESC_TYPE_LARGE:
  84
  85                 /* Large Resource Type -- All bits are valid */
  86
  87                 return (resource_start_byte);
  88
  89
  90         default:
  91                 /* Invalid type */
  92                 break;
  93         }
  94
  95         return (0xFF);
  96 }
  97
  98
  99 /*******************************************************************************
 100  *
 101  * FUNCTION:    acpi_rs_byte_stream_to_list
 102  *
 103  * PARAMETERS:  byte_stream_buffer      - Pointer to the resource byte stream
 104  *              byte_stream_buffer_length - Length of byte_stream_buffer
 105  *              output_buffer           - Pointer to the buffer that will
 106  *                                        contain the output structures
 107  *
 108  * RETURN:      Status
 109  *
 110  * DESCRIPTION: Takes the resource byte stream and parses it, creating a
 111  *              linked list of resources in the caller's output buffer
 112  *
 113  ******************************************************************************/
 114
 115 acpi_status
 116 acpi_rs_byte_stream_to_list (
 117         u8                              *byte_stream_buffer,
 118         u32                             byte_stream_buffer_length,
 119         u8                              *output_buffer)
 120 {
 121         acpi_status                     status;
 122         acpi_size                       bytes_parsed = 0;
 123         u8                              resource_type = 0;
 124         acpi_size                       bytes_consumed = 0;
 125         u8                              *buffer = output_buffer;
 126         acpi_size                       structure_size = 0;
 127         u8                              end_tag_processed = FALSE;
 128         struct acpi_resource            *resource;
 129
 130         ACPI_FUNCTION_TRACE ("rs_byte_stream_to_list");
 131
 132
 133         while (bytes_parsed < byte_stream_buffer_length &&
 134                         !end_tag_processed) {
 135                 /* The next byte in the stream is the resource type */
 136
 137                 resource_type = acpi_rs_get_resource_type (*byte_stream_buffer);
 138
 139                 switch (resource_type) {
 140                 case ACPI_RDESC_TYPE_MEMORY_24:
 141                         /*
 142                          * 24-Bit Memory Resource
 143                          */
 144                         status = acpi_rs_memory24_resource (byte_stream_buffer,
 145                                          &bytes_consumed, &buffer, &structure_size);
 146                         break;
 147
 148
 149                 case ACPI_RDESC_TYPE_LARGE_VENDOR:
 150                         /*
 151                          * Vendor Defined Resource
 152                          */
 153                         status = acpi_rs_vendor_resource (byte_stream_buffer,
 154                                          &bytes_consumed, &buffer, &structure_size);
 155                         break;
 156
 157
 158                 case ACPI_RDESC_TYPE_MEMORY_32:
 159                         /*
 160                          * 32-Bit Memory Range Resource
 161                          */
 162                         status = acpi_rs_memory32_range_resource (byte_stream_buffer,
 163                                          &bytes_consumed, &buffer, &structure_size);
 164                         break;
 165
 166
 167                 case ACPI_RDESC_TYPE_FIXED_MEMORY_32:
 168                         /*
 169                          * 32-Bit Fixed Memory Resource
 170                          */
 171                         status = acpi_rs_fixed_memory32_resource (byte_stream_buffer,
 172                                          &bytes_consumed, &buffer, &structure_size);
 173                         break;
 174
 175
 176                 case ACPI_RDESC_TYPE_QWORD_ADDRESS_SPACE:
 177                 case ACPI_RDESC_TYPE_EXTENDED_ADDRESS_SPACE:
 178                         /*
 179                          * 64-Bit Address Resource
 180                          */
 181                         status = acpi_rs_address64_resource (byte_stream_buffer,
 182                                          &bytes_consumed, &buffer, &structure_size);
 183                         break;
 184
 185
 186                 case ACPI_RDESC_TYPE_DWORD_ADDRESS_SPACE:
 187                         /*
 188                          * 32-Bit Address Resource
 189                          */
 190                         status = acpi_rs_address32_resource (byte_stream_buffer,
 191                                          &bytes_consumed, &buffer, &structure_size);
 192                         break;
 193
 194
 195                 case ACPI_RDESC_TYPE_WORD_ADDRESS_SPACE:
 196                         /*
 197                          * 16-Bit Address Resource
 198                          */
 199                         status = acpi_rs_address16_resource (byte_stream_buffer,
 200                                          &bytes_consumed, &buffer, &structure_size);
 201                         break;
 202
 203
 204                 case ACPI_RDESC_TYPE_EXTENDED_XRUPT:
 205                         /*
 206                          * Extended IRQ
 207                          */
 208                         status = acpi_rs_extended_irq_resource (byte_stream_buffer,
 209                                          &bytes_consumed, &buffer, &structure_size);
 210                         break;
 211
 212
 213                 case ACPI_RDESC_TYPE_IRQ_FORMAT:
 214                         /*
 215                          * IRQ Resource
 216                          */
 217                         status = acpi_rs_irq_resource (byte_stream_buffer,
 218                                          &bytes_consumed, &buffer, &structure_size);
 219                         break;
 220
 221
 222                 case ACPI_RDESC_TYPE_DMA_FORMAT:
 223                         /*
 224                          * DMA Resource
 225                          */
 226                         status = acpi_rs_dma_resource (byte_stream_buffer,
 227                                          &bytes_consumed, &buffer, &structure_size);
 228                         break;
 229
 230
 231                 case ACPI_RDESC_TYPE_START_DEPENDENT:
 232                         /*
 233                          * Start Dependent Functions Resource
 234                          */
 235                         status = acpi_rs_start_depend_fns_resource (byte_stream_buffer,
 236                                          &bytes_consumed, &buffer, &structure_size);
 237                         break;
 238
 239
 240                 case ACPI_RDESC_TYPE_END_DEPENDENT:
 241                         /*
 242                          * End Dependent Functions Resource
 243                          */
 244                         status = acpi_rs_end_depend_fns_resource (byte_stream_buffer,
 245                                          &bytes_consumed, &buffer, &structure_size);
 246                         break;
 247
 248
 249                 case ACPI_RDESC_TYPE_IO_PORT:
 250                         /*
 251                          * IO Port Resource
 252                          */
 253                         status = acpi_rs_io_resource (byte_stream_buffer,
 254                                          &bytes_consumed, &buffer, &structure_size);
 255                         break;
 256
 257
 258                 case ACPI_RDESC_TYPE_FIXED_IO_PORT:
 259                         /*
 260                          * Fixed IO Port Resource
 261                          */
 262                         status = acpi_rs_fixed_io_resource (byte_stream_buffer,
 263                                          &bytes_consumed, &buffer, &structure_size);
 264                         break;
 265
 266
 267                 case ACPI_RDESC_TYPE_SMALL_VENDOR:
 268                         /*
 269                          * Vendor Specific Resource
 270                          */
 271                         status = acpi_rs_vendor_resource (byte_stream_buffer,
 272                                          &bytes_consumed, &buffer, &structure_size);
 273                         break;
 274
 275
 276                 case ACPI_RDESC_TYPE_END_TAG:
 277                         /*
 278                          * End Tag
 279                          */
 280                         end_tag_processed = TRUE;
 281                         status = acpi_rs_end_tag_resource (byte_stream_buffer,
 282                                          &bytes_consumed, &buffer, &structure_size);
 283                         break;
 284
 285
 286                 default:
 287                         /*
 288                          * Invalid/Unknown resource type
 289                          */
 290                         status = AE_AML_INVALID_RESOURCE_TYPE;
 291                         break;
 292                 }
 293
 294                 if (ACPI_FAILURE (status)) {
 295                         return_ACPI_STATUS (status);
 296                 }
 297
 298                 /* Update the return value and counter */
 299
 300                 bytes_parsed += bytes_consumed;
 301
 302                 /* Set the byte stream to point to the next resource */
 303
 304                 byte_stream_buffer += bytes_consumed;
 305
 306                 /* Set the Buffer to the next structure */
 307
 308                 resource = ACPI_CAST_PTR (struct acpi_resource, buffer);
 309                 resource->length = (u32) ACPI_ALIGN_RESOURCE_SIZE (resource->length);
 310                 buffer += ACPI_ALIGN_RESOURCE_SIZE (structure_size);
 311         }
 312
 313         /* Check the reason for exiting the while loop */
 314
 315         if (!end_tag_processed) {
 316                 return_ACPI_STATUS (AE_AML_NO_RESOURCE_END_TAG);
 317         }
 318
 319         return_ACPI_STATUS (AE_OK);
 320 }
 321
 322
 323 /*******************************************************************************
 324  *
 325  * FUNCTION:    acpi_rs_list_to_byte_stream
 326  *
 327  * PARAMETERS:  linked_list             - Pointer to the resource linked list
 328  *              byte_steam_size_needed  - Calculated size of the byte stream
 329  *                                        needed from calling
 330  *                                        acpi_rs_get_byte_stream_length()
 331  *                                        The size of the output_buffer is
 332  *                                        guaranteed to be >=
 333  *                                        byte_stream_size_needed
 334  *              output_buffer           - Pointer to the buffer that will
 335  *                                        contain the byte stream
 336  *
 337  * RETURN:      Status
 338  *
 339  * DESCRIPTION: Takes the resource linked list and parses it, creating a
 340  *              byte stream of resources in the caller's output buffer
 341  *
 342  ******************************************************************************/
 343
 344 acpi_status
 345 acpi_rs_list_to_byte_stream (
 346         struct acpi_resource            *linked_list,
 347         acpi_size                       byte_stream_size_needed,
 348         u8                              *output_buffer)
 349 {
 350         acpi_status                     status;
 351         u8                              *buffer = output_buffer;
 352         acpi_size                       bytes_consumed = 0;
 353         u8                              done = FALSE;
 354
 355
 356         ACPI_FUNCTION_TRACE ("rs_list_to_byte_stream");
 357
 358
 359         while (!done) {
 360                 switch (linked_list->id) {
 361                 case ACPI_RSTYPE_IRQ:
 362                         /*
 363                          * IRQ Resource
 364                          */
 365                         status = acpi_rs_irq_stream (linked_list, &buffer, &bytes_consumed);
 366                         break;
 367
 368                 case ACPI_RSTYPE_DMA:
 369                         /*
 370                          * DMA Resource
 371                          */
 372                         status = acpi_rs_dma_stream (linked_list, &buffer, &bytes_consumed);
 373                         break;
 374
 375                 case ACPI_RSTYPE_START_DPF:
 376                         /*
 377                          * Start Dependent Functions Resource
 378                          */
 379                         status = acpi_rs_start_depend_fns_stream (linked_list,
 380                                           &buffer, &bytes_consumed);
 381                         break;
 382
 383                 case ACPI_RSTYPE_END_DPF:
 384                         /*
 385                          * End Dependent Functions Resource
 386                          */
 387                         status = acpi_rs_end_depend_fns_stream (linked_list,
 388                                           &buffer, &bytes_consumed);
 389                         break;
 390
 391                 case ACPI_RSTYPE_IO:
 392                         /*
 393                          * IO Port Resource
 394                          */
 395                         status = acpi_rs_io_stream (linked_list, &buffer, &bytes_consumed);
 396                         break;
 397
 398                 case ACPI_RSTYPE_FIXED_IO:
 399                         /*
 400                          * Fixed IO Port Resource
 401                          */
 402                         status = acpi_rs_fixed_io_stream (linked_list, &buffer, &bytes_consumed);
 403                         break;
 404
 405                 case ACPI_RSTYPE_VENDOR:
 406                         /*
 407                          * Vendor Defined Resource
 408                          */
 409                         status = acpi_rs_vendor_stream (linked_list, &buffer, &bytes_consumed);
 410                         break;
 411
 412                 case ACPI_RSTYPE_END_TAG:
 413                         /*
 414                          * End Tag
 415                          */
 416                         status = acpi_rs_end_tag_stream (linked_list, &buffer, &bytes_consumed);
 417
 418                         /* An End Tag indicates the end of the Resource Template */
 419
 420                         done = TRUE;
 421                         break;
 422
 423                 case ACPI_RSTYPE_MEM24:
 424                         /*
 425                          * 24-Bit Memory Resource
 426                          */
 427                         status = acpi_rs_memory24_stream (linked_list, &buffer, &bytes_consumed);
 428                         break;
 429
 430                 case ACPI_RSTYPE_MEM32:
 431                         /*
 432                          * 32-Bit Memory Range Resource
 433                          */
 434                         status = acpi_rs_memory32_range_stream (linked_list, &buffer,
 435                                          &bytes_consumed);
 436                         break;
 437
 438                 case ACPI_RSTYPE_FIXED_MEM32:
 439                         /*
 440                          * 32-Bit Fixed Memory Resource
 441                          */
 442                         status = acpi_rs_fixed_memory32_stream (linked_list, &buffer,
 443                                          &bytes_consumed);
 444                         break;
 445
 446                 case ACPI_RSTYPE_ADDRESS16:
 447                         /*
 448                          * 16-Bit Address Descriptor Resource
 449                          */
 450                         status = acpi_rs_address16_stream (linked_list, &buffer,
 451                                          &bytes_consumed);
 452                         break;
 453
 454                 case ACPI_RSTYPE_ADDRESS32:
 455                         /*
 456                          * 32-Bit Address Descriptor Resource
 457                          */
 458                         status = acpi_rs_address32_stream (linked_list, &buffer,
 459                                          &bytes_consumed);
 460                         break;
 461
 462                 case ACPI_RSTYPE_ADDRESS64:
 463                         /*
 464                          * 64-Bit Address Descriptor Resource
 465                          */
 466                         status = acpi_rs_address64_stream (linked_list, &buffer,
 467                                          &bytes_consumed);
 468                         break;
 469
 470                 case ACPI_RSTYPE_EXT_IRQ:
 471                         /*
 472                          * Extended IRQ Resource
 473                          */
 474                         status = acpi_rs_extended_irq_stream (linked_list, &buffer,
 475                                          &bytes_consumed);
 476                         break;
 477
 478                 default:
 479                         /*
 480                          * If we get here, everything is out of sync,
 481                          * so exit with an error
 482                          */
 483                         ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
 484                                 "Invalid descriptor type (%X) in resource list\n",
 485                                 linked_list->id));
 486                         status = AE_BAD_DATA;
 487                         break;
 488                 }
 489
 490                 if (ACPI_FAILURE (status)) {
 491                         return_ACPI_STATUS (status);
 492                 }
 493
 494                 /* Set the Buffer to point to the open byte */
 495
 496                 buffer += bytes_consumed;
 497
 498                 /* Point to the next object */
 499
 500                 linked_list = ACPI_PTR_ADD (struct acpi_resource,
 501                                   linked_list, linked_list->length);
 502         }
 503
 504         return_ACPI_STATUS (AE_OK);
 505 }
 506