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 - 2007, 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 #include <acpi/amlcode.h>
  47 #include <acpi/acnamesp.h>
  48
  49 #define _COMPONENT          ACPI_RESOURCES
  50 ACPI_MODULE_NAME("rscalc")
  51
  52 /* Local prototypes */
  53 static u8 acpi_rs_count_set_bits(u16 bit_field);
  54
  55 static acpi_rs_length
  56 acpi_rs_struct_option_length(struct acpi_resource_source *resource_source);
  57
  58 static u32
  59 acpi_rs_stream_option_length(u32 resource_length, u32 minimum_total_length);
  60
  61 /*******************************************************************************
  62  *
  63  * FUNCTION:    acpi_rs_count_set_bits
  64  *
  65  * PARAMETERS:  bit_field       - Field in which to count bits
  66  *
  67  * RETURN:      Number of bits set within the field
  68  *
  69  * DESCRIPTION: Count the number of bits set in a resource field. Used for
  70  *              (Short descriptor) interrupt and DMA lists.
  71  *
  72  ******************************************************************************/
  73
  74 static u8 acpi_rs_count_set_bits(u16 bit_field)
  75 {
  76         u8 bits_set;
  77
  78         ACPI_FUNCTION_ENTRY();
  79
  80         for (bits_set = 0; bit_field; bits_set++) {
  81
  82                 /* Zero the least significant bit that is set */
  83
  84                 bit_field &= (bit_field - 1);
  85         }
  86
  87         return (bits_set);
  88 }
  89
  90 /*******************************************************************************
  91  *
  92  * FUNCTION:    acpi_rs_struct_option_length
  93  *
  94  * PARAMETERS:  resource_source     - Pointer to optional descriptor field
  95  *
  96  * RETURN:      Status
  97  *
  98  * DESCRIPTION: Common code to handle optional resource_source_index and
  99  *              resource_source fields in some Large descriptors. Used during
 100  *              list-to-stream conversion
 101  *
 102  ******************************************************************************/
 103
 104 static acpi_rs_length
 105 acpi_rs_struct_option_length(struct acpi_resource_source *resource_source)
 106 {
 107         ACPI_FUNCTION_ENTRY();
 108
 109         /*
 110          * If the resource_source string is valid, return the size of the string
 111          * (string_length includes the NULL terminator) plus the size of the
 112          * resource_source_index (1).
 113          */
 114         if (resource_source->string_ptr) {
 115                 return ((acpi_rs_length) (resource_source->string_length + 1));
 116         }
 117
 118         return (0);
 119 }
 120
 121 /*******************************************************************************
 122  *
 123  * FUNCTION:    acpi_rs_stream_option_length
 124  *
 125  * PARAMETERS:  resource_length     - Length from the resource header
 126  *              minimum_total_length - Minimum length of this resource, before
 127  *                                    any optional fields. Includes header size
 128  *
 129  * RETURN:      Length of optional string (0 if no string present)
 130  *
 131  * DESCRIPTION: Common code to handle optional resource_source_index and
 132  *              resource_source fields in some Large descriptors. Used during
 133  *              stream-to-list conversion
 134  *
 135  ******************************************************************************/
 136
 137 static u32
 138 acpi_rs_stream_option_length(u32 resource_length,
 139                              u32 minimum_aml_resource_length)
 140 {
 141         u32 string_length = 0;
 142
 143         ACPI_FUNCTION_ENTRY();
 144
 145         /*
 146          * The resource_source_index and resource_source are optional elements of some
 147          * Large-type resource descriptors.
 148          */
 149
 150         /*
 151          * If the length of the actual resource descriptor is greater than the ACPI
 152          * spec-defined minimum length, it means that a resource_source_index exists
 153          * and is followed by a (required) null terminated string. The string length
 154          * (including the null terminator) is the resource length minus the minimum
 155          * length, minus one byte for the resource_source_index itself.
 156          */
 157         if (resource_length > minimum_aml_resource_length) {
 158
 159                 /* Compute the length of the optional string */
 160
 161                 string_length =
 162                     resource_length - minimum_aml_resource_length - 1;
 163         }
 164
 165         /*
 166          * Round the length up to a multiple of the native word in order to
 167          * guarantee that the entire resource descriptor is native word aligned
 168          */
 169         return ((u32) ACPI_ROUND_UP_TO_NATIVE_WORD(string_length));
 170 }
 171
 172 /*******************************************************************************
 173  *
 174  * FUNCTION:    acpi_rs_get_aml_length
 175  *
 176  * PARAMETERS:  Resource            - Pointer to the resource linked list
 177  *              size_needed         - Where the required size is returned
 178  *
 179  * RETURN:      Status
 180  *
 181  * DESCRIPTION: Takes a linked list of internal resource descriptors and
 182  *              calculates the size buffer needed to hold the corresponding
 183  *              external resource byte stream.
 184  *
 185  ******************************************************************************/
 186
 187 acpi_status
 188 acpi_rs_get_aml_length(struct acpi_resource * resource, acpi_size * size_needed)
 189 {
 190         acpi_size aml_size_needed = 0;
 191         acpi_rs_length total_size;
 192
 193         ACPI_FUNCTION_TRACE(rs_get_aml_length);
 194
 195         /* Traverse entire list of internal resource descriptors */
 196
 197         while (resource) {
 198
 199                 /* Validate the descriptor type */
 200
 201                 if (resource->type > ACPI_RESOURCE_TYPE_MAX) {
 202                         return_ACPI_STATUS(AE_AML_INVALID_RESOURCE_TYPE);
 203                 }
 204
 205                 /* Get the base size of the (external stream) resource descriptor */
 206
 207                 total_size = acpi_gbl_aml_resource_sizes[resource->type];
 208
 209                 /*
 210                  * Augment the base size for descriptors with optional and/or
 211                  * variable-length fields
 212                  */
 213                 switch (resource->type) {
 214                 case ACPI_RESOURCE_TYPE_VENDOR:
 215                         /*
 216                          * Vendor Defined Resource:
 217                          * For a Vendor Specific resource, if the Length is between 1 and 7
 218                          * it will be created as a Small Resource data type, otherwise it
 219                          * is a Large Resource data type.
 220                          */
 221                         if (resource->data.vendor.byte_length > 7) {
 222
 223                                 /* Base size of a Large resource descriptor */
 224
 225                                 total_size =
 226                                     sizeof(struct aml_resource_large_header);
 227                         }
 228
 229                         /* Add the size of the vendor-specific data */
 230
 231                         total_size = (acpi_rs_length)
 232                             (total_size + resource->data.vendor.byte_length);
 233                         break;
 234
 235                 case ACPI_RESOURCE_TYPE_END_TAG:
 236                         /*
 237                          * End Tag:
 238                          * We are done -- return the accumulated total size.
 239                          */
 240                         *size_needed = aml_size_needed + total_size;
 241
 242                         /* Normal exit */
 243
 244                         return_ACPI_STATUS(AE_OK);
 245
 246                 case ACPI_RESOURCE_TYPE_ADDRESS16:
 247                         /*
 248                          * 16-Bit Address Resource:
 249                          * Add the size of the optional resource_source info
 250                          */
 251                         total_size = (acpi_rs_length)
 252                             (total_size +
 253                              acpi_rs_struct_option_length(&resource->data.
 254                                                           address16.
 255                                                           resource_source));
 256                         break;
 257
 258                 case ACPI_RESOURCE_TYPE_ADDRESS32:
 259                         /*
 260                          * 32-Bit Address Resource:
 261                          * Add the size of the optional resource_source info
 262                          */
 263                         total_size = (acpi_rs_length)
 264                             (total_size +
 265                              acpi_rs_struct_option_length(&resource->data.
 266                                                           address32.
 267                                                           resource_source));
 268                         break;
 269
 270                 case ACPI_RESOURCE_TYPE_ADDRESS64:
 271                         /*
 272                          * 64-Bit Address Resource:
 273                          * Add the size of the optional resource_source info
 274                          */
 275                         total_size = (acpi_rs_length)
 276                             (total_size +
 277                              acpi_rs_struct_option_length(&resource->data.
 278                                                           address64.
 279                                                           resource_source));
 280                         break;
 281
 282                 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
 283                         /*
 284                          * Extended IRQ Resource:
 285                          * Add the size of each additional optional interrupt beyond the
 286                          * required 1 (4 bytes for each u32 interrupt number)
 287                          */
 288                         total_size = (acpi_rs_length)
 289                             (total_size +
 290                              ((resource->data.extended_irq.interrupt_count -
 291                                1) * 4) +
 292                              /* Add the size of the optional resource_source info */
 293                              acpi_rs_struct_option_length(&resource->data.
 294                                                           extended_irq.
 295                                                           resource_source));
 296                         break;
 297
 298                 default:
 299                         break;
 300                 }
 301
 302                 /* Update the total */
 303
 304                 aml_size_needed += total_size;
 305
 306                 /* Point to the next object */
 307
 308                 resource =
 309                     ACPI_ADD_PTR(struct acpi_resource, resource,
 310                                  resource->length);
 311         }
 312
 313         /* Did not find an end_tag resource descriptor */
 314
 315         return_ACPI_STATUS(AE_AML_NO_RESOURCE_END_TAG);
 316 }
 317
 318 /*******************************************************************************
 319  *
 320  * FUNCTION:    acpi_rs_get_list_length
 321  *
 322  * PARAMETERS:  aml_buffer          - Pointer to the resource byte stream
 323  *              aml_buffer_length   - Size of aml_buffer
 324  *              size_needed         - Where the size needed is returned
 325  *
 326  * RETURN:      Status
 327  *
 328  * DESCRIPTION: Takes an external resource byte stream and calculates the size
 329  *              buffer needed to hold the corresponding internal resource
 330  *              descriptor linked list.
 331  *
 332  ******************************************************************************/
 333
 334 acpi_status
 335 acpi_rs_get_list_length(u8 * aml_buffer,
 336                         u32 aml_buffer_length, acpi_size * size_needed)
 337 {
 338         acpi_status status;
 339         u8 *end_aml;
 340         u8 *buffer;
 341         u32 buffer_size;
 342         u16 temp16;
 343         u16 resource_length;
 344         u32 extra_struct_bytes;
 345         u8 resource_index;
 346         u8 minimum_aml_resource_length;
 347
 348         ACPI_FUNCTION_TRACE(rs_get_list_length);
 349
 350         *size_needed = 0;
 351         end_aml = aml_buffer + aml_buffer_length;
 352
 353         /* Walk the list of AML resource descriptors */
 354
 355         while (aml_buffer < end_aml) {
 356
 357                 /* Validate the Resource Type and Resource Length */
 358
 359                 status = acpi_ut_validate_resource(aml_buffer, &resource_index);
 360                 if (ACPI_FAILURE(status)) {
 361                         return_ACPI_STATUS(status);
 362                 }
 363
 364                 /* Get the resource length and base (minimum) AML size */
 365
 366                 resource_length = acpi_ut_get_resource_length(aml_buffer);
 367                 minimum_aml_resource_length =
 368                     acpi_gbl_resource_aml_sizes[resource_index];
 369
 370                 /*
 371                  * Augment the size for descriptors with optional
 372                  * and/or variable length fields
 373                  */
 374                 extra_struct_bytes = 0;
 375                 buffer =
 376                     aml_buffer + acpi_ut_get_resource_header_length(aml_buffer);
 377
 378                 switch (acpi_ut_get_resource_type(aml_buffer)) {
 379                 case ACPI_RESOURCE_NAME_IRQ:
 380                         /*
 381                          * IRQ Resource:
 382                          * Get the number of bits set in the 16-bit IRQ mask
 383                          */
 384                         ACPI_MOVE_16_TO_16(&temp16, buffer);
 385                         extra_struct_bytes = acpi_rs_count_set_bits(temp16);
 386                         break;
 387
 388                 case ACPI_RESOURCE_NAME_DMA:
 389                         /*
 390                          * DMA Resource:
 391                          * Get the number of bits set in the 8-bit DMA mask
 392                          */
 393                         extra_struct_bytes = acpi_rs_count_set_bits(*buffer);
 394                         break;
 395
 396                 case ACPI_RESOURCE_NAME_VENDOR_SMALL:
 397                 case ACPI_RESOURCE_NAME_VENDOR_LARGE:
 398                         /*
 399                          * Vendor Resource:
 400                          * Get the number of vendor data bytes
 401                          */
 402                         extra_struct_bytes = resource_length;
 403                         break;
 404
 405                 case ACPI_RESOURCE_NAME_END_TAG:
 406                         /*
 407                          * End Tag:
 408                          * This is the normal exit, add size of end_tag
 409                          */
 410                         *size_needed += ACPI_RS_SIZE_MIN;
 411                         return_ACPI_STATUS(AE_OK);
 412
 413                 case ACPI_RESOURCE_NAME_ADDRESS32:
 414                 case ACPI_RESOURCE_NAME_ADDRESS16:
 415                 case ACPI_RESOURCE_NAME_ADDRESS64:
 416                         /*
 417                          * Address Resource:
 418                          * Add the size of the optional resource_source
 419                          */
 420                         extra_struct_bytes =
 421                             acpi_rs_stream_option_length(resource_length,
 422                                                          minimum_aml_resource_length);
 423                         break;
 424
 425                 case ACPI_RESOURCE_NAME_EXTENDED_IRQ:
 426                         /*
 427                          * Extended IRQ Resource:
 428                          * Using the interrupt_table_length, add 4 bytes for each additional
 429                          * interrupt. Note: at least one interrupt is required and is
 430                          * included in the minimum descriptor size (reason for the -1)
 431                          */
 432                         extra_struct_bytes = (buffer[1] - 1) * sizeof(u32);
 433
 434                         /* Add the size of the optional resource_source */
 435
 436                         extra_struct_bytes +=
 437                             acpi_rs_stream_option_length(resource_length -
 438                                                          extra_struct_bytes,
 439                                                          minimum_aml_resource_length);
 440                         break;
 441
 442                 default:
 443                         break;
 444                 }
 445
 446                 /*
 447                  * Update the required buffer size for the internal descriptor structs
 448                  *
 449                  * Important: Round the size up for the appropriate alignment. This
 450                  * is a requirement on IA64.
 451                  */
 452                 buffer_size = acpi_gbl_resource_struct_sizes[resource_index] +
 453                     extra_struct_bytes;
 454                 buffer_size = (u32) ACPI_ROUND_UP_TO_NATIVE_WORD(buffer_size);
 455
 456                 *size_needed += buffer_size;
 457
 458                 ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES,
 459                                   "Type %.2X, AmlLength %.2X InternalLength %.2X\n",
 460                                   acpi_ut_get_resource_type(aml_buffer),
 461                                   acpi_ut_get_descriptor_length(aml_buffer),
 462                                   buffer_size));
 463
 464                 /*
 465                  * Point to the next resource within the AML stream using the length
 466                  * contained in the resource descriptor header
 467                  */
 468                 aml_buffer += acpi_ut_get_descriptor_length(aml_buffer);
 469         }
 470
 471         /* Did not find an end_tag resource descriptor */
 472
 473         return_ACPI_STATUS(AE_AML_NO_RESOURCE_END_TAG);
 474 }
 475
 476 /*******************************************************************************
 477  *
 478  * FUNCTION:    acpi_rs_get_pci_routing_table_length
 479  *
 480  * PARAMETERS:  package_object          - Pointer to the package object
 481  *              buffer_size_needed      - u32 pointer of the size buffer
 482  *                                        needed to properly return the
 483  *                                        parsed data
 484  *
 485  * RETURN:      Status
 486  *
 487  * DESCRIPTION: Given a package representing a PCI routing table, this
 488  *              calculates the size of the corresponding linked list of
 489  *              descriptions.
 490  *
 491  ******************************************************************************/
 492
 493 acpi_status
 494 acpi_rs_get_pci_routing_table_length(union acpi_operand_object *package_object,
 495                                      acpi_size * buffer_size_needed)
 496 {
 497         u32 number_of_elements;
 498         acpi_size temp_size_needed = 0;
 499         union acpi_operand_object **top_object_list;
 500         u32 index;
 501         union acpi_operand_object *package_element;
 502         union acpi_operand_object **sub_object_list;
 503         u8 name_found;
 504         u32 table_index;
 505
 506         ACPI_FUNCTION_TRACE(rs_get_pci_routing_table_length);
 507
 508         number_of_elements = package_object->package.count;
 509
 510         /*
 511          * Calculate the size of the return buffer.
 512          * The base size is the number of elements * the sizes of the
 513          * structures.  Additional space for the strings is added below.
 514          * The minus one is to subtract the size of the u8 Source[1]
 515          * member because it is added below.
 516          *
 517          * But each PRT_ENTRY structure has a pointer to a string and
 518          * the size of that string must be found.
 519          */
 520         top_object_list = package_object->package.elements;
 521
 522         for (index = 0; index < number_of_elements; index++) {
 523
 524                 /* Dereference the sub-package */
 525
 526                 package_element = *top_object_list;
 527
 528                 /*
 529                  * The sub_object_list will now point to an array of the
 530                  * four IRQ elements: Address, Pin, Source and source_index
 531                  */
 532                 sub_object_list = package_element->package.elements;
 533
 534                 /* Scan the irq_table_elements for the Source Name String */
 535
 536                 name_found = FALSE;
 537
 538                 for (table_index = 0; table_index < 4 && !name_found;
 539                      table_index++) {
 540                         if (*sub_object_list && /* Null object allowed */
 541                             ((ACPI_TYPE_STRING ==
 542                               ACPI_GET_OBJECT_TYPE(*sub_object_list)) ||
 543                              ((ACPI_TYPE_LOCAL_REFERENCE ==
 544                                ACPI_GET_OBJECT_TYPE(*sub_object_list)) &&
 545                               ((*sub_object_list)->reference.opcode ==
 546                                AML_INT_NAMEPATH_OP)))) {
 547                                 name_found = TRUE;
 548                         } else {
 549                                 /* Look at the next element */
 550
 551                                 sub_object_list++;
 552                         }
 553                 }
 554
 555                 temp_size_needed += (sizeof(struct acpi_pci_routing_table) - 4);
 556
 557                 /* Was a String type found? */
 558
 559                 if (name_found) {
 560                         if (ACPI_GET_OBJECT_TYPE(*sub_object_list) ==
 561                             ACPI_TYPE_STRING) {
 562                                 /*
 563                                  * The length String.Length field does not include the
 564                                  * terminating NULL, add 1
 565                                  */
 566                                 temp_size_needed += ((acpi_size)
 567                                                      (*sub_object_list)->string.
 568                                                      length + 1);
 569                         } else {
 570                                 temp_size_needed +=
 571                                     acpi_ns_get_pathname_length((*sub_object_list)->reference.node);
 572                         }
 573                 } else {
 574                         /*
 575                          * If no name was found, then this is a NULL, which is
 576                          * translated as a u32 zero.
 577                          */
 578                         temp_size_needed += sizeof(u32);
 579                 }
 580
 581                 /* Round up the size since each element must be aligned */
 582
 583                 temp_size_needed = ACPI_ROUND_UP_TO_64BIT(temp_size_needed);
 584
 585                 /* Point to the next union acpi_operand_object */
 586
 587                 top_object_list++;
 588         }
 589
 590         /*
 591          * Add an extra element to the end of the list, essentially a
 592          * NULL terminator
 593          */
 594         *buffer_size_needed =
 595             temp_size_needed + sizeof(struct acpi_pci_routing_table);
 596         return_ACPI_STATUS(AE_OK);
 597 }