1/******************************************************************************* 2 * 3 * Module Name: rscalc - Calculate stream and list lengths 4 * 5 ******************************************************************************/ 6 7/* 8 * Copyright (C) 2000 - 2011, Intel Corp. 9 * All rights reserved. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions, and the following disclaimer, 16 * without modification. 17 * 2. Redistributions in binary form must reproduce at minimum a disclaimer 18 * substantially similar to the "NO WARRANTY" disclaimer below 19 * ("Disclaimer") and any redistribution must be conditioned upon 20 * including a substantially similar Disclaimer requirement for further 21 * binary redistribution. 22 * 3. Neither the names of the above-listed copyright holders nor the names 23 * of any contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * Alternatively, this software may be distributed under the terms of the 27 * GNU General Public License ("GPL") version 2 as published by the Free 28 * Software Foundation. 29 * 30 * NO WARRANTY 31 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 32 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 33 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR 34 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 35 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 36 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 37 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 38 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 39 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 40 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 41 * POSSIBILITY OF SUCH DAMAGES. 42 */ 43 44#include <acpi/acpi.h> 45#include "accommon.h" 46#include "acresrc.h" 47#include "acnamesp.h" 48 49#define _COMPONENT ACPI_RESOURCES 50ACPI_MODULE_NAME("rscalc") 51 52/* Local prototypes */ 53static u8 acpi_rs_count_set_bits(u16 bit_field); 54 55static acpi_rs_length 56acpi_rs_struct_option_length(struct acpi_resource_source *resource_source); 57 58static u32 59acpi_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 74static 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 &= (u16) (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 104static acpi_rs_length 105acpi_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 137static u32 138acpi_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 187acpi_status 188acpi_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_IRQ: 215 216 /* Length can be 3 or 2 */ 217 218 if (resource->data.irq.descriptor_length == 2) { 219 total_size--; 220 } 221 break; 222 223 case ACPI_RESOURCE_TYPE_START_DEPENDENT: 224 225 /* Length can be 1 or 0 */ 226 227 if (resource->data.irq.descriptor_length == 0) { 228 total_size--; 229 } 230 break; 231 232 case ACPI_RESOURCE_TYPE_VENDOR: 233 /* 234 * Vendor Defined Resource: 235 * For a Vendor Specific resource, if the Length is between 1 and 7 236 * it will be created as a Small Resource data type, otherwise it 237 * is a Large Resource data type. 238 */ 239 if (resource->data.vendor.byte_length > 7) { 240 241 /* Base size of a Large resource descriptor */ 242 243 total_size = 244 sizeof(struct aml_resource_large_header); 245 } 246 247 /* Add the size of the vendor-specific data */ 248 249 total_size = (acpi_rs_length) 250 (total_size + resource->data.vendor.byte_length); 251 break; 252 253 case ACPI_RESOURCE_TYPE_END_TAG: 254 /* 255 * End Tag: 256 * We are done -- return the accumulated total size. 257 */ 258 *size_needed = aml_size_needed + total_size; 259 260 /* Normal exit */ 261 262 return_ACPI_STATUS(AE_OK); 263 264 case ACPI_RESOURCE_TYPE_ADDRESS16: 265 /* 266 * 16-Bit Address Resource: 267 * Add the size of the optional resource_source info 268 */ 269 total_size = (acpi_rs_length) 270 (total_size + 271 acpi_rs_struct_option_length(&resource->data. 272 address16. 273 resource_source)); 274 break; 275 276 case ACPI_RESOURCE_TYPE_ADDRESS32: 277 /* 278 * 32-Bit Address Resource: 279 * Add the size of the optional resource_source info 280 */ 281 total_size = (acpi_rs_length) 282 (total_size + 283 acpi_rs_struct_option_length(&resource->data. 284 address32. 285 resource_source)); 286 break; 287 288 case ACPI_RESOURCE_TYPE_ADDRESS64: 289 /* 290 * 64-Bit Address Resource: 291 * Add the size of the optional resource_source info 292 */ 293 total_size = (acpi_rs_length) 294 (total_size + 295 acpi_rs_struct_option_length(&resource->data. 296 address64. 297 resource_source)); 298 break; 299 300 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ: 301 /* 302 * Extended IRQ Resource: 303 * Add the size of each additional optional interrupt beyond the 304 * required 1 (4 bytes for each u32 interrupt number) 305 */ 306 total_size = (acpi_rs_length) 307 (total_size + 308 ((resource->data.extended_irq.interrupt_count - 309 1) * 4) + 310 /* Add the size of the optional resource_source info */ 311 acpi_rs_struct_option_length(&resource->data. 312 extended_irq. 313 resource_source)); 314 break; 315 316 default: 317 break; 318 } 319 320 /* Update the total */ 321 322 aml_size_needed += total_size; 323 324 /* Point to the next object */ 325 326 resource = 327 ACPI_ADD_PTR(struct acpi_resource, resource, 328 resource->length); 329 } 330 331 /* Did not find an end_tag resource descriptor */ 332 333 return_ACPI_STATUS(AE_AML_NO_RESOURCE_END_TAG); 334} 335 336/******************************************************************************* 337 * 338 * FUNCTION: acpi_rs_get_list_length 339 * 340 * PARAMETERS: aml_buffer - Pointer to the resource byte stream 341 * aml_buffer_length - Size of aml_buffer 342 * size_needed - Where the size needed is returned 343 * 344 * RETURN: Status 345 * 346 * DESCRIPTION: Takes an external resource byte stream and calculates the size 347 * buffer needed to hold the corresponding internal resource 348 * descriptor linked list. 349 * 350 ******************************************************************************/ 351 352acpi_status 353acpi_rs_get_list_length(u8 * aml_buffer, 354 u32 aml_buffer_length, acpi_size * size_needed) 355{ 356 acpi_status status; 357 u8 *end_aml; 358 u8 *buffer; 359 u32 buffer_size; 360 u16 temp16; 361 u16 resource_length; 362 u32 extra_struct_bytes; 363 u8 resource_index; 364 u8 minimum_aml_resource_length; 365 366 ACPI_FUNCTION_TRACE(rs_get_list_length); 367 368 *size_needed = 0; 369 end_aml = aml_buffer + aml_buffer_length; 370 371 /* Walk the list of AML resource descriptors */ 372 373 while (aml_buffer < end_aml) { 374 375 /* Validate the Resource Type and Resource Length */ 376 377 status = acpi_ut_validate_resource(aml_buffer, &resource_index); 378 if (ACPI_FAILURE(status)) { 379 return_ACPI_STATUS(status); 380 } 381 382 /* Get the resource length and base (minimum) AML size */ 383 384 resource_length = acpi_ut_get_resource_length(aml_buffer); 385 minimum_aml_resource_length = 386 acpi_gbl_resource_aml_sizes[resource_index]; 387 388 /* 389 * Augment the size for descriptors with optional 390 * and/or variable length fields 391 */ 392 extra_struct_bytes = 0; 393 buffer = 394 aml_buffer + acpi_ut_get_resource_header_length(aml_buffer); 395 396 switch (acpi_ut_get_resource_type(aml_buffer)) { 397 case ACPI_RESOURCE_NAME_IRQ: 398 /* 399 * IRQ Resource: 400 * Get the number of bits set in the 16-bit IRQ mask 401 */ 402 ACPI_MOVE_16_TO_16(&temp16, buffer); 403 extra_struct_bytes = acpi_rs_count_set_bits(temp16); 404 break; 405 406 case ACPI_RESOURCE_NAME_DMA: 407 /* 408 * DMA Resource: 409 * Get the number of bits set in the 8-bit DMA mask 410 */ 411 extra_struct_bytes = acpi_rs_count_set_bits(*buffer); 412 break; 413 414 case ACPI_RESOURCE_NAME_VENDOR_SMALL: 415 case ACPI_RESOURCE_NAME_VENDOR_LARGE: 416 /* 417 * Vendor Resource: 418 * Get the number of vendor data bytes 419 */ 420 extra_struct_bytes = resource_length; 421 break; 422 423 case ACPI_RESOURCE_NAME_END_TAG: 424 /* 425 * End Tag: 426 * This is the normal exit, add size of end_tag 427 */ 428 *size_needed += ACPI_RS_SIZE_MIN; 429 return_ACPI_STATUS(AE_OK); 430 431 case ACPI_RESOURCE_NAME_ADDRESS32: 432 case ACPI_RESOURCE_NAME_ADDRESS16: 433 case ACPI_RESOURCE_NAME_ADDRESS64: 434 /* 435 * Address Resource: 436 * Add the size of the optional resource_source 437 */ 438 extra_struct_bytes = 439 acpi_rs_stream_option_length(resource_length, 440 minimum_aml_resource_length); 441 break; 442 443 case ACPI_RESOURCE_NAME_EXTENDED_IRQ: 444 /* 445 * Extended IRQ Resource: 446 * Using the interrupt_table_length, add 4 bytes for each additional 447 * interrupt. Note: at least one interrupt is required and is 448 * included in the minimum descriptor size (reason for the -1) 449 */ 450 extra_struct_bytes = (buffer[1] - 1) * sizeof(u32); 451 452 /* Add the size of the optional resource_source */ 453 454 extra_struct_bytes += 455 acpi_rs_stream_option_length(resource_length - 456 extra_struct_bytes, 457 minimum_aml_resource_length); 458 break; 459 460 default: 461 break; 462 } 463 464 /* 465 * Update the required buffer size for the internal descriptor structs 466 * 467 * Important: Round the size up for the appropriate alignment. This 468 * is a requirement on IA64. 469 */ 470 buffer_size = acpi_gbl_resource_struct_sizes[resource_index] + 471 extra_struct_bytes; 472 buffer_size = (u32) ACPI_ROUND_UP_TO_NATIVE_WORD(buffer_size); 473 474 *size_needed += buffer_size; 475 476 ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES, 477 "Type %.2X, AmlLength %.2X InternalLength %.2X\n", 478 acpi_ut_get_resource_type(aml_buffer), 479 acpi_ut_get_descriptor_length(aml_buffer), 480 buffer_size)); 481 482 /* 483 * Point to the next resource within the AML stream using the length 484 * contained in the resource descriptor header 485 */ 486 aml_buffer += acpi_ut_get_descriptor_length(aml_buffer); 487 } 488 489 /* Did not find an end_tag resource descriptor */ 490 491 return_ACPI_STATUS(AE_AML_NO_RESOURCE_END_TAG); 492} 493 494/******************************************************************************* 495 * 496 * FUNCTION: acpi_rs_get_pci_routing_table_length 497 * 498 * PARAMETERS: package_object - Pointer to the package object 499 * buffer_size_needed - u32 pointer of the size buffer 500 * needed to properly return the 501 * parsed data 502 * 503 * RETURN: Status 504 * 505 * DESCRIPTION: Given a package representing a PCI routing table, this 506 * calculates the size of the corresponding linked list of 507 * descriptions. 508 * 509 ******************************************************************************/ 510 511acpi_status 512acpi_rs_get_pci_routing_table_length(union acpi_operand_object *package_object, 513 acpi_size * buffer_size_needed) 514{ 515 u32 number_of_elements; 516 acpi_size temp_size_needed = 0; 517 union acpi_operand_object **top_object_list; 518 u32 index; 519 union acpi_operand_object *package_element; 520 union acpi_operand_object **sub_object_list; 521 u8 name_found; 522 u32 table_index; 523 524 ACPI_FUNCTION_TRACE(rs_get_pci_routing_table_length); 525 526 number_of_elements = package_object->package.count; 527 528 /* 529 * Calculate the size of the return buffer. 530 * The base size is the number of elements * the sizes of the 531 * structures. Additional space for the strings is added below. 532 * The minus one is to subtract the size of the u8 Source[1] 533 * member because it is added below. 534 * 535 * But each PRT_ENTRY structure has a pointer to a string and 536 * the size of that string must be found. 537 */ 538 top_object_list = package_object->package.elements; 539 540 for (index = 0; index < number_of_elements; index++) { 541 542 /* Dereference the sub-package */ 543 544 package_element = *top_object_list; 545 546 /* We must have a valid Package object */ 547 548 if (!package_element || 549 (package_element->common.type != ACPI_TYPE_PACKAGE)) { 550 return_ACPI_STATUS(AE_AML_OPERAND_TYPE); 551 } 552 553 /* 554 * The sub_object_list will now point to an array of the 555 * four IRQ elements: Address, Pin, Source and source_index 556 */ 557 sub_object_list = package_element->package.elements; 558 559 /* Scan the irq_table_elements for the Source Name String */ 560 561 name_found = FALSE; 562 563 for (table_index = 0; table_index < 4 && !name_found; 564 table_index++) { 565 if (*sub_object_list && /* Null object allowed */ 566 ((ACPI_TYPE_STRING == 567 (*sub_object_list)->common.type) || 568 ((ACPI_TYPE_LOCAL_REFERENCE == 569 (*sub_object_list)->common.type) && 570 ((*sub_object_list)->reference.class == 571 ACPI_REFCLASS_NAME)))) { 572 name_found = TRUE; 573 } else { 574 /* Look at the next element */ 575 576 sub_object_list++; 577 } 578 } 579 580 temp_size_needed += (sizeof(struct acpi_pci_routing_table) - 4); 581 582 /* Was a String type found? */ 583 584 if (name_found) { 585 if ((*sub_object_list)->common.type == ACPI_TYPE_STRING) { 586 /* 587 * The length String.Length field does not include the 588 * terminating NULL, add 1 589 */ 590 temp_size_needed += ((acpi_size) 591 (*sub_object_list)->string. 592 length + 1); 593 } else { 594 temp_size_needed += 595 acpi_ns_get_pathname_length((*sub_object_list)->reference.node); 596 } 597 } else { 598 /* 599 * If no name was found, then this is a NULL, which is 600 * translated as a u32 zero. 601 */ 602 temp_size_needed += sizeof(u32); 603 } 604 605 /* Round up the size since each element must be aligned */ 606 607 temp_size_needed = ACPI_ROUND_UP_TO_64BIT(temp_size_needed); 608 609 /* Point to the next union acpi_operand_object */ 610 611 top_object_list++; 612 } 613 614 /* 615 * Add an extra element to the end of the list, essentially a 616 * NULL terminator 617 */ 618 *buffer_size_needed = 619 temp_size_needed + sizeof(struct acpi_pci_routing_table); 620 return_ACPI_STATUS(AE_OK); 621} 622