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

   1 /*******************************************************************************
   2  *
   3  * Module Name: rscalc - Calculate stream and list lengths
   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    ("rscalc")
  52
  53
  54 /*******************************************************************************
  55  *
  56  * FUNCTION:    acpi_rs_get_byte_stream_length
  57  *
  58  * PARAMETERS:  linked_list         - Pointer to the resource linked list
  59  *              size_needed         - u32 pointer of the size buffer needed
  60  *                                    to properly return the parsed data
  61  *
  62  * RETURN:      Status
  63  *
  64  * DESCRIPTION: Takes the resource byte stream and parses it once, calculating
  65  *              the size buffer needed to hold the linked list that conveys
  66  *              the resource data.
  67  *
  68  ******************************************************************************/
  69
  70 acpi_status
  71 acpi_rs_get_byte_stream_length (
  72         struct acpi_resource            *linked_list,
  73         acpi_size                       *size_needed)
  74 {
  75         acpi_size                       byte_stream_size_needed = 0;
  76         acpi_size                       segment_size;
  77         u8                              done = FALSE;
  78
  79
  80         ACPI_FUNCTION_TRACE ("rs_get_byte_stream_length");
  81
  82
  83         while (!done) {
  84                 /* Init the variable that will hold the size to add to the total. */
  85
  86                 segment_size = 0;
  87
  88                 switch (linked_list->id) {
  89                 case ACPI_RSTYPE_IRQ:
  90                         /*
  91                          * IRQ Resource
  92                          * For an IRQ Resource, Byte 3, although optional, will always be
  93                          * created - it holds IRQ information.
  94                          */
  95                         segment_size = 4;
  96                         break;
  97
  98                 case ACPI_RSTYPE_DMA:
  99                         /*
 100                          * DMA Resource
 101                          * For this resource the size is static
 102                          */
 103                         segment_size = 3;
 104                         break;
 105
 106                 case ACPI_RSTYPE_START_DPF:
 107                         /*
 108                          * Start Dependent Functions Resource
 109                          * For a start_dependent_functions Resource, Byte 1, although
 110                          * optional, will always be created.
 111                          */
 112                         segment_size = 2;
 113                         break;
 114
 115                 case ACPI_RSTYPE_END_DPF:
 116                         /*
 117                          * End Dependent Functions Resource
 118                          * For this resource the size is static
 119                          */
 120                         segment_size = 1;
 121                         break;
 122
 123                 case ACPI_RSTYPE_IO:
 124                         /*
 125                          * IO Port Resource
 126                          * For this resource the size is static
 127                          */
 128                         segment_size = 8;
 129                         break;
 130
 131                 case ACPI_RSTYPE_FIXED_IO:
 132                         /*
 133                          * Fixed IO Port Resource
 134                          * For this resource the size is static
 135                          */
 136                         segment_size = 4;
 137                         break;
 138
 139                 case ACPI_RSTYPE_VENDOR:
 140                         /*
 141                          * Vendor Defined Resource
 142                          * For a Vendor Specific resource, if the Length is between 1 and 7
 143                          * it will be created as a Small Resource data type, otherwise it
 144                          * is a Large Resource data type.
 145                          */
 146                         if (linked_list->data.vendor_specific.length > 7) {
 147                                 segment_size = 3;
 148                         }
 149                         else {
 150                                 segment_size = 1;
 151                         }
 152                         segment_size += linked_list->data.vendor_specific.length;
 153                         break;
 154
 155                 case ACPI_RSTYPE_END_TAG:
 156                         /*
 157                          * End Tag
 158                          * For this resource the size is static
 159                          */
 160                         segment_size = 2;
 161                         done = TRUE;
 162                         break;
 163
 164                 case ACPI_RSTYPE_MEM24:
 165                         /*
 166                          * 24-Bit Memory Resource
 167                          * For this resource the size is static
 168                          */
 169                         segment_size = 12;
 170                         break;
 171
 172                 case ACPI_RSTYPE_MEM32:
 173                         /*
 174                          * 32-Bit Memory Range Resource
 175                          * For this resource the size is static
 176                          */
 177                         segment_size = 20;
 178                         break;
 179
 180                 case ACPI_RSTYPE_FIXED_MEM32:
 181                         /*
 182                          * 32-Bit Fixed Memory Resource
 183                          * For this resource the size is static
 184                          */
 185                         segment_size = 12;
 186                         break;
 187
 188                 case ACPI_RSTYPE_ADDRESS16:
 189                         /*
 190                          * 16-Bit Address Resource
 191                          * The base size of this byte stream is 16. If a Resource Source
 192                          * string is not NULL, add 1 for the Index + the length of the null
 193                          * terminated string Resource Source + 1 for the null.
 194                          */
 195                         segment_size = 16;
 196
 197                         if (linked_list->data.address16.resource_source.string_ptr) {
 198                                 segment_size +=
 199                                         linked_list->data.address16.resource_source.string_length;
 200                                 segment_size++;
 201                         }
 202                         break;
 203
 204                 case ACPI_RSTYPE_ADDRESS32:
 205                         /*
 206                          * 32-Bit Address Resource
 207                          * The base size of this byte stream is 26. If a Resource
 208                          * Source string is not NULL, add 1 for the Index + the
 209                          * length of the null terminated string Resource Source +
 210                          * 1 for the null.
 211                          */
 212                         segment_size = 26;
 213
 214                         if (linked_list->data.address32.resource_source.string_ptr) {
 215                                 segment_size +=
 216                                         linked_list->data.address32.resource_source.string_length;
 217                                 segment_size++;
 218                         }
 219                         break;
 220
 221                 case ACPI_RSTYPE_ADDRESS64:
 222                         /*
 223                          * 64-Bit Address Resource
 224                          * The base size of this byte stream is 46. If a resource_source
 225                          * string is not NULL, add 1 for the Index + the length of the null
 226                          * terminated string Resource Source + 1 for the null.
 227                          */
 228                         segment_size = 46;
 229
 230                         if (linked_list->data.address64.resource_source.string_ptr) {
 231                                 segment_size +=
 232                                         linked_list->data.address64.resource_source.string_length;
 233                                 segment_size++;
 234                         }
 235                         break;
 236
 237                 case ACPI_RSTYPE_EXT_IRQ:
 238                         /*
 239                          * Extended IRQ Resource
 240                          * The base size of this byte stream is 9. This is for an Interrupt
 241                          * table length of 1.  For each additional interrupt, add 4.
 242                          * If a Resource Source string is not NULL, add 1 for the
 243                          * Index + the length of the null terminated string
 244                          * Resource Source + 1 for the null.
 245                          */
 246                         segment_size = 9 + (((acpi_size)
 247                                 linked_list->data.extended_irq.number_of_interrupts - 1) * 4);
 248
 249                         if (linked_list->data.extended_irq.resource_source.string_ptr) {
 250                                 segment_size +=
 251                                         linked_list->data.extended_irq.resource_source.string_length;
 252                                 segment_size++;
 253                         }
 254                         break;
 255
 256                 default:
 257
 258                         /* If we get here, everything is out of sync, exit with error */
 259
 260                         return_ACPI_STATUS (AE_AML_INVALID_RESOURCE_TYPE);
 261
 262                 } /* switch (linked_list->Id) */
 263
 264                 /* Update the total */
 265
 266                 byte_stream_size_needed += segment_size;
 267
 268                 /* Point to the next object */
 269
 270                 linked_list = ACPI_PTR_ADD (struct acpi_resource,
 271                                   linked_list, linked_list->length);
 272         }
 273
 274         /* This is the data the caller needs */
 275
 276         *size_needed = byte_stream_size_needed;
 277         return_ACPI_STATUS (AE_OK);
 278 }
 279
 280
 281 /*******************************************************************************
 282  *
 283  * FUNCTION:    acpi_rs_get_list_length
 284  *
 285  * PARAMETERS:  byte_stream_buffer      - Pointer to the resource byte stream
 286  *              byte_stream_buffer_length - Size of byte_stream_buffer
 287  *              size_needed             - u32 pointer of the size buffer
 288  *                                        needed to properly return the
 289  *                                        parsed data
 290  *
 291  * RETURN:      Status
 292  *
 293  * DESCRIPTION: Takes the resource byte stream and parses it once, calculating
 294  *              the size buffer needed to hold the linked list that conveys
 295  *              the resource data.
 296  *
 297  ******************************************************************************/
 298
 299 acpi_status
 300 acpi_rs_get_list_length (
 301         u8                              *byte_stream_buffer,
 302         u32                             byte_stream_buffer_length,
 303         acpi_size                       *size_needed)
 304 {
 305         u32                             buffer_size = 0;
 306         u32                             bytes_parsed = 0;
 307         u8                              number_of_interrupts = 0;
 308         u8                              number_of_channels = 0;
 309         u8                              resource_type;
 310         u32                             structure_size;
 311         u32                             bytes_consumed;
 312         u8                              *buffer;
 313         u8                              temp8;
 314         u16                             temp16;
 315         u8                              index;
 316         u8                              additional_bytes;
 317
 318
 319         ACPI_FUNCTION_TRACE ("rs_get_list_length");
 320
 321
 322         while (bytes_parsed < byte_stream_buffer_length) {
 323                 /* The next byte in the stream is the resource type */
 324
 325                 resource_type = acpi_rs_get_resource_type (*byte_stream_buffer);
 326
 327                 switch (resource_type) {
 328                 case ACPI_RDESC_TYPE_MEMORY_24:
 329                         /*
 330                          * 24-Bit Memory Resource
 331                          */
 332                         bytes_consumed = 12;
 333
 334                         structure_size = ACPI_SIZEOF_RESOURCE (struct acpi_resource_mem24);
 335                         break;
 336
 337
 338                 case ACPI_RDESC_TYPE_LARGE_VENDOR:
 339                         /*
 340                          * Vendor Defined Resource
 341                          */
 342                         buffer = byte_stream_buffer;
 343                         ++buffer;
 344
 345                         ACPI_MOVE_16_TO_16 (&temp16, buffer);
 346                         bytes_consumed = temp16 + 3;
 347
 348                         /* Ensure a 32-bit boundary for the structure */
 349
 350                         temp16 = (u16) ACPI_ROUND_UP_to_32_bITS (temp16);
 351
 352                         structure_size = ACPI_SIZEOF_RESOURCE (struct acpi_resource_vendor) +
 353                                            (temp16 * sizeof (u8));
 354                         break;
 355
 356
 357                 case ACPI_RDESC_TYPE_MEMORY_32:
 358                         /*
 359                          * 32-Bit Memory Range Resource
 360                          */
 361                         bytes_consumed = 20;
 362
 363                         structure_size = ACPI_SIZEOF_RESOURCE (struct acpi_resource_mem32);
 364                         break;
 365
 366
 367                 case ACPI_RDESC_TYPE_FIXED_MEMORY_32:
 368                         /*
 369                          * 32-Bit Fixed Memory Resource
 370                          */
 371                         bytes_consumed = 12;
 372
 373                         structure_size = ACPI_SIZEOF_RESOURCE (struct acpi_resource_fixed_mem32);
 374                         break;
 375
 376
 377                 case ACPI_RDESC_TYPE_EXTENDED_ADDRESS_SPACE:
 378                         /*
 379                          * 64-Bit Address Resource
 380                          */
 381                         buffer = byte_stream_buffer;
 382
 383                         ++buffer;
 384                         ACPI_MOVE_16_TO_16 (&temp16, buffer);
 385
 386                         bytes_consumed = temp16 + 3;
 387                         structure_size = ACPI_SIZEOF_RESOURCE (struct acpi_resource_address64);
 388                         break;
 389
 390
 391                 case ACPI_RDESC_TYPE_QWORD_ADDRESS_SPACE:
 392                         /*
 393                          * 64-Bit Address Resource
 394                          */
 395                         buffer = byte_stream_buffer;
 396
 397                         ++buffer;
 398                         ACPI_MOVE_16_TO_16 (&temp16, buffer);
 399
 400                         bytes_consumed = temp16 + 3;
 401
 402                         /*
 403                          * Resource Source Index and Resource Source are optional elements.
 404                          * Check the length of the Bytestream.  If it is greater than 43,
 405                          * that means that an Index exists and is followed by a null
 406                          * terminated string.  Therefore, set the temp variable to the
 407                          * length minus the minimum byte stream length plus the byte for
 408                          * the Index to determine the size of the NULL terminated string.
 409                          */
 410                         if (43 < temp16) {
 411                                 temp8 = (u8) (temp16 - 44);
 412                         }
 413                         else {
 414                                 temp8 = 0;
 415                         }
 416
 417                         /* Ensure a 64-bit boundary for the structure */
 418
 419                         temp8 = (u8) ACPI_ROUND_UP_to_64_bITS (temp8);
 420
 421                         structure_size = ACPI_SIZEOF_RESOURCE (struct acpi_resource_address64) +
 422                                            (temp8 * sizeof (u8));
 423                         break;
 424
 425
 426                 case ACPI_RDESC_TYPE_DWORD_ADDRESS_SPACE:
 427                         /*
 428                          * 32-Bit Address Resource
 429                          */
 430                         buffer = byte_stream_buffer;
 431
 432                         ++buffer;
 433                         ACPI_MOVE_16_TO_16 (&temp16, buffer);
 434
 435                         bytes_consumed = temp16 + 3;
 436
 437                         /*
 438                          * Resource Source Index and Resource Source are optional elements.
 439                          * Check the length of the Bytestream.  If it is greater than 23,
 440                          * that means that an Index exists and is followed by a null
 441                          * terminated string.  Therefore, set the temp variable to the
 442                          * length minus the minimum byte stream length plus the byte for
 443                          * the Index to determine the size of the NULL terminated string.
 444                          */
 445                         if (23 < temp16) {
 446                                 temp8 = (u8) (temp16 - 24);
 447                         }
 448                         else {
 449                                 temp8 = 0;
 450                         }
 451
 452                         /* Ensure a 32-bit boundary for the structure */
 453
 454                         temp8 = (u8) ACPI_ROUND_UP_to_32_bITS (temp8);
 455
 456                         structure_size = ACPI_SIZEOF_RESOURCE (struct acpi_resource_address32) +
 457                                            (temp8 * sizeof (u8));
 458                         break;
 459
 460
 461                 case ACPI_RDESC_TYPE_WORD_ADDRESS_SPACE:
 462                         /*
 463                          * 16-Bit Address Resource
 464                          */
 465                         buffer = byte_stream_buffer;
 466
 467                         ++buffer;
 468                         ACPI_MOVE_16_TO_16 (&temp16, buffer);
 469
 470                         bytes_consumed = temp16 + 3;
 471
 472                         /*
 473                          * Resource Source Index and Resource Source are optional elements.
 474                          * Check the length of the Bytestream.  If it is greater than 13,
 475                          * that means that an Index exists and is followed by a null
 476                          * terminated string.  Therefore, set the temp variable to the
 477                          * length minus the minimum byte stream length plus the byte for
 478                          * the Index to determine the size of the NULL terminated string.
 479                          */
 480                         if (13 < temp16) {
 481                                 temp8 = (u8) (temp16 - 14);
 482                         }
 483                         else {
 484                                 temp8 = 0;
 485                         }
 486
 487                         /* Ensure a 32-bit boundary for the structure */
 488
 489                         temp8 = (u8) ACPI_ROUND_UP_to_32_bITS (temp8);
 490
 491                         structure_size = ACPI_SIZEOF_RESOURCE (struct acpi_resource_address16) +
 492                                            (temp8 * sizeof (u8));
 493                         break;
 494
 495
 496                 case ACPI_RDESC_TYPE_EXTENDED_XRUPT:
 497                         /*
 498                          * Extended IRQ
 499                          */
 500                         buffer = byte_stream_buffer;
 501
 502                         ++buffer;
 503                         ACPI_MOVE_16_TO_16 (&temp16, buffer);
 504
 505                         bytes_consumed = temp16 + 3;
 506
 507                         /*
 508                          * Point past the length field and the Interrupt vector flags to
 509                          * save off the Interrupt table length to the Temp8 variable.
 510                          */
 511                         buffer += 3;
 512                         temp8 = *buffer;
 513
 514                         /*
 515                          * To compensate for multiple interrupt numbers, add 4 bytes for
 516                          * each additional interrupts greater than 1
 517                          */
 518                         additional_bytes = (u8) ((temp8 - 1) * 4);
 519
 520                         /*
 521                          * Resource Source Index and Resource Source are optional elements.
 522                          * Check the length of the Bytestream.  If it is greater than 9,
 523                          * that means that an Index exists and is followed by a null
 524                          * terminated string.  Therefore, set the temp variable to the
 525                          * length minus the minimum byte stream length plus the byte for
 526                          * the Index to determine the size of the NULL terminated string.
 527                          */
 528                         if (9 + additional_bytes < temp16) {
 529                                 temp8 = (u8) (temp16 - (9 + additional_bytes));
 530                         }
 531                         else {
 532                                 temp8 = 0;
 533                         }
 534
 535                         /* Ensure a 32-bit boundary for the structure */
 536
 537                         temp8 = (u8) ACPI_ROUND_UP_to_32_bITS (temp8);
 538
 539                         structure_size = ACPI_SIZEOF_RESOURCE (struct acpi_resource_ext_irq) +
 540                                            (additional_bytes * sizeof (u8)) +
 541                                            (temp8 * sizeof (u8));
 542                         break;
 543
 544
 545                 case ACPI_RDESC_TYPE_IRQ_FORMAT:
 546                         /*
 547                          * IRQ Resource.
 548                          * Determine if it there are two or three trailing bytes
 549                          */
 550                         buffer = byte_stream_buffer;
 551                         temp8 = *buffer;
 552
 553                         if(temp8 & 0x01) {
 554                                 bytes_consumed = 4;
 555                         }
 556                         else {
 557                                 bytes_consumed = 3;
 558                         }
 559
 560                         /* Point past the descriptor */
 561
 562                         ++buffer;
 563
 564                         /* Look at the number of bits set */
 565
 566                         ACPI_MOVE_16_TO_16 (&temp16, buffer);
 567
 568                         for (index = 0; index < 16; index++) {
 569                                 if (temp16 & 0x1) {
 570                                         ++number_of_interrupts;
 571                                 }
 572
 573                                 temp16 >>= 1;
 574                         }
 575
 576                         structure_size = ACPI_SIZEOF_RESOURCE (struct acpi_resource_io) +
 577                                            (number_of_interrupts * sizeof (u32));
 578                         break;
 579
 580
 581                 case ACPI_RDESC_TYPE_DMA_FORMAT:
 582                         /*
 583                          * DMA Resource
 584                          */
 585                         buffer = byte_stream_buffer;
 586                         bytes_consumed = 3;
 587
 588                         /* Point past the descriptor */
 589
 590                         ++buffer;
 591
 592                         /* Look at the number of bits set */
 593
 594                         temp8 = *buffer;
 595
 596                         for(index = 0; index < 8; index++) {
 597                                 if(temp8 & 0x1) {
 598                                         ++number_of_channels;
 599                                 }
 600
 601                                 temp8 >>= 1;
 602                         }
 603
 604                         structure_size = ACPI_SIZEOF_RESOURCE (struct acpi_resource_dma) +
 605                                            (number_of_channels * sizeof (u32));
 606                         break;
 607
 608
 609                 case ACPI_RDESC_TYPE_START_DEPENDENT:
 610                         /*
 611                          * Start Dependent Functions Resource
 612                          * Determine if it there are two or three trailing bytes
 613                          */
 614                         buffer = byte_stream_buffer;
 615                         temp8 = *buffer;
 616
 617                         if(temp8 & 0x01) {
 618                                 bytes_consumed = 2;
 619                         }
 620                         else {
 621                                 bytes_consumed = 1;
 622                         }
 623
 624                         structure_size = ACPI_SIZEOF_RESOURCE (struct acpi_resource_start_dpf);
 625                         break;
 626
 627
 628                 case ACPI_RDESC_TYPE_END_DEPENDENT:
 629                         /*
 630                          * End Dependent Functions Resource
 631                          */
 632                         bytes_consumed = 1;
 633                         structure_size = ACPI_RESOURCE_LENGTH;
 634                         break;
 635
 636
 637                 case ACPI_RDESC_TYPE_IO_PORT:
 638                         /*
 639                          * IO Port Resource
 640                          */
 641                         bytes_consumed = 8;
 642                         structure_size = ACPI_SIZEOF_RESOURCE (struct acpi_resource_io);
 643                         break;
 644
 645
 646                 case ACPI_RDESC_TYPE_FIXED_IO_PORT:
 647                         /*
 648                          * Fixed IO Port Resource
 649                          */
 650                         bytes_consumed = 4;
 651                         structure_size = ACPI_SIZEOF_RESOURCE (struct acpi_resource_fixed_io);
 652                         break;
 653
 654
 655                 case ACPI_RDESC_TYPE_SMALL_VENDOR:
 656                         /*
 657                          * Vendor Specific Resource
 658                          */
 659                         buffer = byte_stream_buffer;
 660
 661                         temp8 = *buffer;
 662                         temp8 = (u8) (temp8 & 0x7);
 663                         bytes_consumed = temp8 + 1;
 664
 665                         /* Ensure a 32-bit boundary for the structure */
 666
 667                         temp8 = (u8) ACPI_ROUND_UP_to_32_bITS (temp8);
 668                         structure_size = ACPI_SIZEOF_RESOURCE (struct acpi_resource_vendor) +
 669                                            (temp8 * sizeof (u8));
 670                         break;
 671
 672
 673                 case ACPI_RDESC_TYPE_END_TAG:
 674                         /*
 675                          * End Tag
 676                          */
 677                         bytes_consumed = 2;
 678                         structure_size = ACPI_RESOURCE_LENGTH;
 679                         byte_stream_buffer_length = bytes_parsed;
 680                         break;
 681
 682
 683                 default:
 684                         /*
 685                          * If we get here, everything is out of sync,
 686                          * exit with an error
 687                          */
 688                         return_ACPI_STATUS (AE_AML_INVALID_RESOURCE_TYPE);
 689                 }
 690
 691                 /* Update the return value and counter */
 692
 693                 buffer_size += (u32) ACPI_ALIGN_RESOURCE_SIZE (structure_size);
 694                 bytes_parsed += bytes_consumed;
 695
 696                 /* Set the byte stream to point to the next resource */
 697
 698                 byte_stream_buffer += bytes_consumed;
 699         }
 700
 701         /* This is the data the caller needs */
 702
 703         *size_needed = buffer_size;
 704         return_ACPI_STATUS (AE_OK);
 705 }
 706
 707
 708 /*******************************************************************************
 709  *
 710  * FUNCTION:    acpi_rs_get_pci_routing_table_length
 711  *
 712  * PARAMETERS:  package_object          - Pointer to the package object
 713  *              buffer_size_needed      - u32 pointer of the size buffer
 714  *                                        needed to properly return the
 715  *                                        parsed data
 716  *
 717  * RETURN:      Status
 718  *
 719  * DESCRIPTION: Given a package representing a PCI routing table, this
 720  *              calculates the size of the corresponding linked list of
 721  *              descriptions.
 722  *
 723  ******************************************************************************/
 724
 725 acpi_status
 726 acpi_rs_get_pci_routing_table_length (
 727         union acpi_operand_object       *package_object,
 728         acpi_size                       *buffer_size_needed)
 729 {
 730         u32                             number_of_elements;
 731         acpi_size                       temp_size_needed = 0;
 732         union acpi_operand_object       **top_object_list;
 733         u32                             index;
 734         union acpi_operand_object       *package_element;
 735         union acpi_operand_object       **sub_object_list;
 736         u8                              name_found;
 737         u32                             table_index;
 738
 739
 740         ACPI_FUNCTION_TRACE ("rs_get_pci_routing_table_length");
 741
 742
 743         number_of_elements = package_object->package.count;
 744
 745         /*
 746          * Calculate the size of the return buffer.
 747          * The base size is the number of elements * the sizes of the
 748          * structures.  Additional space for the strings is added below.
 749          * The minus one is to subtract the size of the u8 Source[1]
 750          * member because it is added below.
 751          *
 752          * But each PRT_ENTRY structure has a pointer to a string and
 753          * the size of that string must be found.
 754          */
 755         top_object_list = package_object->package.elements;
 756
 757         for (index = 0; index < number_of_elements; index++) {
 758                 /* Dereference the sub-package */
 759
 760                 package_element = *top_object_list;
 761
 762                 /*
 763                  * The sub_object_list will now point to an array of the
 764                  * four IRQ elements: Address, Pin, Source and source_index
 765                  */
 766                 sub_object_list = package_element->package.elements;
 767
 768                 /* Scan the irq_table_elements for the Source Name String */
 769
 770                 name_found = FALSE;
 771
 772                 for (table_index = 0; table_index < 4 && !name_found; table_index++) {
 773                         if ((ACPI_TYPE_STRING ==
 774                                         ACPI_GET_OBJECT_TYPE (*sub_object_list)) ||
 775
 776                                 ((ACPI_TYPE_LOCAL_REFERENCE ==
 777                                         ACPI_GET_OBJECT_TYPE (*sub_object_list)) &&
 778
 779                                         ((*sub_object_list)->reference.opcode ==
 780                                                 AML_INT_NAMEPATH_OP))) {
 781                                 name_found = TRUE;
 782                         }
 783                         else {
 784                                 /* Look at the next element */
 785
 786                                 sub_object_list++;
 787                         }
 788                 }
 789
 790                 temp_size_needed += (sizeof (struct acpi_pci_routing_table) - 4);
 791
 792                 /* Was a String type found? */
 793
 794                 if (name_found) {
 795                         if (ACPI_GET_OBJECT_TYPE (*sub_object_list) == ACPI_TYPE_STRING) {
 796                                 /*
 797                                  * The length String.Length field does not include the
 798                                  * terminating NULL, add 1
 799                                  */
 800                                 temp_size_needed += ((acpi_size)
 801                                         (*sub_object_list)->string.length + 1);
 802                         }
 803                         else {
 804                                 temp_size_needed += acpi_ns_get_pathname_length (
 805                                                    (*sub_object_list)->reference.node);
 806                         }
 807                 }
 808                 else {
 809                         /*
 810                          * If no name was found, then this is a NULL, which is
 811                          * translated as a u32 zero.
 812                          */
 813                         temp_size_needed += sizeof (u32);
 814                 }
 815
 816                 /* Round up the size since each element must be aligned */
 817
 818                 temp_size_needed = ACPI_ROUND_UP_to_64_bITS (temp_size_needed);
 819
 820                 /* Point to the next union acpi_operand_object */
 821
 822                 top_object_list++;
 823         }
 824
 825         /*
 826          * Adding an extra element to the end of the list, essentially a
 827          * NULL terminator
 828          */
 829         *buffer_size_needed = temp_size_needed + sizeof (struct acpi_pci_routing_table);
 830         return_ACPI_STATUS (AE_OK);
 831 }