1 /****************************************************************************** 2 * 3 * Module Name: exfldio - Aml Field I/O 4 * 5 *****************************************************************************/ 6 7 /* 8 * Copyright (C) 2000 - 2015, 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.h" 45 #include "accommon.h" 46 #include "acinterp.h" 47 #include "amlcode.h" 48 #include "acevents.h" 49 #include "acdispat.h" 50 51 52 #define _COMPONENT ACPI_EXECUTER 53 ACPI_MODULE_NAME ("exfldio") 54 55 /* Local prototypes */ 56 57 static ACPI_STATUS 58 AcpiExFieldDatumIo ( 59 ACPI_OPERAND_OBJECT *ObjDesc, 60 UINT32 FieldDatumByteOffset, 61 UINT64 *Value, 62 UINT32 ReadWrite); 63 64 static BOOLEAN 65 AcpiExRegisterOverflow ( 66 ACPI_OPERAND_OBJECT *ObjDesc, 67 UINT64 Value); 68 69 static ACPI_STATUS 70 AcpiExSetupRegion ( 71 ACPI_OPERAND_OBJECT *ObjDesc, 72 UINT32 FieldDatumByteOffset); 73 74 75 /******************************************************************************* 76 * 77 * FUNCTION: AcpiExSetupRegion 78 * 79 * PARAMETERS: ObjDesc - Field to be read or written 80 * FieldDatumByteOffset - Byte offset of this datum within the 81 * parent field 82 * 83 * RETURN: Status 84 * 85 * DESCRIPTION: Common processing for AcpiExExtractFromField and 86 * AcpiExInsertIntoField. Initialize the Region if necessary and 87 * validate the request. 88 * 89 ******************************************************************************/ 90 91 static ACPI_STATUS 92 AcpiExSetupRegion ( 93 ACPI_OPERAND_OBJECT *ObjDesc, 94 UINT32 FieldDatumByteOffset) 95 { 96 ACPI_STATUS Status = AE_OK; 97 ACPI_OPERAND_OBJECT *RgnDesc; 98 UINT8 SpaceId; 99 100 101 ACPI_FUNCTION_TRACE_U32 (ExSetupRegion, FieldDatumByteOffset); 102 103 104 RgnDesc = ObjDesc->CommonField.RegionObj; 105 106 /* We must have a valid region */ 107 108 if (RgnDesc->Common.Type != ACPI_TYPE_REGION) 109 { 110 ACPI_ERROR ((AE_INFO, "Needed Region, found type 0x%X (%s)", 111 RgnDesc->Common.Type, 112 AcpiUtGetObjectTypeName (RgnDesc))); 113 114 return_ACPI_STATUS (AE_AML_OPERAND_TYPE); 115 } 116 117 SpaceId = RgnDesc->Region.SpaceId; 118 119 /* Validate the Space ID */ 120 121 if (!AcpiIsValidSpaceId (SpaceId)) 122 { 123 ACPI_ERROR ((AE_INFO, 124 "Invalid/unknown Address Space ID: 0x%2.2X", SpaceId)); 125 return_ACPI_STATUS (AE_AML_INVALID_SPACE_ID); 126 } 127 128 /* 129 * If the Region Address and Length have not been previously evaluated, 130 * evaluate them now and save the results. 131 */ 132 if (!(RgnDesc->Common.Flags & AOPOBJ_DATA_VALID)) 133 { 134 Status = AcpiDsGetRegionArguments (RgnDesc); 135 if (ACPI_FAILURE (Status)) 136 { 137 return_ACPI_STATUS (Status); 138 } 139 } 140 141 /* 142 * Exit now for SMBus, GSBus or IPMI address space, it has a non-linear 143 * address space and the request cannot be directly validated 144 */ 145 if (SpaceId == ACPI_ADR_SPACE_SMBUS || 146 SpaceId == ACPI_ADR_SPACE_GSBUS || 147 SpaceId == ACPI_ADR_SPACE_IPMI) 148 { 149 /* SMBus or IPMI has a non-linear address space */ 150 151 return_ACPI_STATUS (AE_OK); 152 } 153 154 #ifdef ACPI_UNDER_DEVELOPMENT 155 /* 156 * If the Field access is AnyAcc, we can now compute the optimal 157 * access (because we know know the length of the parent region) 158 */ 159 if (!(ObjDesc->Common.Flags & AOPOBJ_DATA_VALID)) 160 { 161 if (ACPI_FAILURE (Status)) 162 { 163 return_ACPI_STATUS (Status); 164 } 165 } 166 #endif 167 168 /* 169 * Validate the request. The entire request from the byte offset for a 170 * length of one field datum (access width) must fit within the region. 171 * (Region length is specified in bytes) 172 */ 173 if (RgnDesc->Region.Length < 174 (ObjDesc->CommonField.BaseByteOffset + FieldDatumByteOffset + 175 ObjDesc->CommonField.AccessByteWidth)) 176 { 177 if (AcpiGbl_EnableInterpreterSlack) 178 { 179 /* 180 * Slack mode only: We will go ahead and allow access to this 181 * field if it is within the region length rounded up to the next 182 * access width boundary. ACPI_SIZE cast for 64-bit compile. 183 */ 184 if (ACPI_ROUND_UP (RgnDesc->Region.Length, 185 ObjDesc->CommonField.AccessByteWidth) >= 186 ((ACPI_SIZE) ObjDesc->CommonField.BaseByteOffset + 187 ObjDesc->CommonField.AccessByteWidth + 188 FieldDatumByteOffset)) 189 { 190 return_ACPI_STATUS (AE_OK); 191 } 192 } 193 194 if (RgnDesc->Region.Length < ObjDesc->CommonField.AccessByteWidth) 195 { 196 /* 197 * This is the case where the AccessType (AccWord, etc.) is wider 198 * than the region itself. For example, a region of length one 199 * byte, and a field with Dword access specified. 200 */ 201 ACPI_ERROR ((AE_INFO, 202 "Field [%4.4s] access width (%u bytes) " 203 "too large for region [%4.4s] (length %u)", 204 AcpiUtGetNodeName (ObjDesc->CommonField.Node), 205 ObjDesc->CommonField.AccessByteWidth, 206 AcpiUtGetNodeName (RgnDesc->Region.Node), 207 RgnDesc->Region.Length)); 208 } 209 210 /* 211 * Offset rounded up to next multiple of field width 212 * exceeds region length, indicate an error 213 */ 214 ACPI_ERROR ((AE_INFO, 215 "Field [%4.4s] Base+Offset+Width %u+%u+%u " 216 "is beyond end of region [%4.4s] (length %u)", 217 AcpiUtGetNodeName (ObjDesc->CommonField.Node), 218 ObjDesc->CommonField.BaseByteOffset, 219 FieldDatumByteOffset, ObjDesc->CommonField.AccessByteWidth, 220 AcpiUtGetNodeName (RgnDesc->Region.Node), 221 RgnDesc->Region.Length)); 222 223 return_ACPI_STATUS (AE_AML_REGION_LIMIT); 224 } 225 226 return_ACPI_STATUS (AE_OK); 227 } 228 229 230 /******************************************************************************* 231 * 232 * FUNCTION: AcpiExAccessRegion 233 * 234 * PARAMETERS: ObjDesc - Field to be read 235 * FieldDatumByteOffset - Byte offset of this datum within the 236 * parent field 237 * Value - Where to store value (must at least 238 * 64 bits) 239 * Function - Read or Write flag plus other region- 240 * dependent flags 241 * 242 * RETURN: Status 243 * 244 * DESCRIPTION: Read or Write a single field datum to an Operation Region. 245 * 246 ******************************************************************************/ 247 248 ACPI_STATUS 249 AcpiExAccessRegion ( 250 ACPI_OPERAND_OBJECT *ObjDesc, 251 UINT32 FieldDatumByteOffset, 252 UINT64 *Value, 253 UINT32 Function) 254 { 255 ACPI_STATUS Status; 256 ACPI_OPERAND_OBJECT *RgnDesc; 257 UINT32 RegionOffset; 258 259 260 ACPI_FUNCTION_TRACE (ExAccessRegion); 261 262 263 /* 264 * Ensure that the region operands are fully evaluated and verify 265 * the validity of the request 266 */ 267 Status = AcpiExSetupRegion (ObjDesc, FieldDatumByteOffset); 268 if (ACPI_FAILURE (Status)) 269 { 270 return_ACPI_STATUS (Status); 271 } 272 273 /* 274 * The physical address of this field datum is: 275 * 276 * 1) The base of the region, plus 277 * 2) The base offset of the field, plus 278 * 3) The current offset into the field 279 */ 280 RgnDesc = ObjDesc->CommonField.RegionObj; 281 RegionOffset = 282 ObjDesc->CommonField.BaseByteOffset + 283 FieldDatumByteOffset; 284 285 if ((Function & ACPI_IO_MASK) == ACPI_READ) 286 { 287 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD, "[READ]")); 288 } 289 else 290 { 291 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD, "[WRITE]")); 292 } 293 294 ACPI_DEBUG_PRINT_RAW ((ACPI_DB_BFIELD, 295 " Region [%s:%X], Width %X, ByteBase %X, Offset %X at %8.8X%8.8X\n", 296 AcpiUtGetRegionName (RgnDesc->Region.SpaceId), 297 RgnDesc->Region.SpaceId, 298 ObjDesc->CommonField.AccessByteWidth, 299 ObjDesc->CommonField.BaseByteOffset, 300 FieldDatumByteOffset, 301 ACPI_FORMAT_UINT64 (RgnDesc->Region.Address + RegionOffset))); 302 303 /* Invoke the appropriate AddressSpace/OpRegion handler */ 304 305 Status = AcpiEvAddressSpaceDispatch (RgnDesc, ObjDesc, 306 Function, RegionOffset, 307 ACPI_MUL_8 (ObjDesc->CommonField.AccessByteWidth), Value); 308 309 if (ACPI_FAILURE (Status)) 310 { 311 if (Status == AE_NOT_IMPLEMENTED) 312 { 313 ACPI_ERROR ((AE_INFO, 314 "Region %s (ID=%u) not implemented", 315 AcpiUtGetRegionName (RgnDesc->Region.SpaceId), 316 RgnDesc->Region.SpaceId)); 317 } 318 else if (Status == AE_NOT_EXIST) 319 { 320 ACPI_ERROR ((AE_INFO, 321 "Region %s (ID=%u) has no handler", 322 AcpiUtGetRegionName (RgnDesc->Region.SpaceId), 323 RgnDesc->Region.SpaceId)); 324 } 325 } 326 327 return_ACPI_STATUS (Status); 328 } 329 330 331 /******************************************************************************* 332 * 333 * FUNCTION: AcpiExRegisterOverflow 334 * 335 * PARAMETERS: ObjDesc - Register(Field) to be written 336 * Value - Value to be stored 337 * 338 * RETURN: TRUE if value overflows the field, FALSE otherwise 339 * 340 * DESCRIPTION: Check if a value is out of range of the field being written. 341 * Used to check if the values written to Index and Bank registers 342 * are out of range. Normally, the value is simply truncated 343 * to fit the field, but this case is most likely a serious 344 * coding error in the ASL. 345 * 346 ******************************************************************************/ 347 348 static BOOLEAN 349 AcpiExRegisterOverflow ( 350 ACPI_OPERAND_OBJECT *ObjDesc, 351 UINT64 Value) 352 { 353 354 if (ObjDesc->CommonField.BitLength >= ACPI_INTEGER_BIT_SIZE) 355 { 356 /* 357 * The field is large enough to hold the maximum integer, so we can 358 * never overflow it. 359 */ 360 return (FALSE); 361 } 362 363 if (Value >= ((UINT64) 1 << ObjDesc->CommonField.BitLength)) 364 { 365 /* 366 * The Value is larger than the maximum value that can fit into 367 * the register. 368 */ 369 ACPI_ERROR ((AE_INFO, 370 "Index value 0x%8.8X%8.8X overflows field width 0x%X", 371 ACPI_FORMAT_UINT64 (Value), 372 ObjDesc->CommonField.BitLength)); 373 374 return (TRUE); 375 } 376 377 /* The Value will fit into the field with no truncation */ 378 379 return (FALSE); 380 } 381 382 383 /******************************************************************************* 384 * 385 * FUNCTION: AcpiExFieldDatumIo 386 * 387 * PARAMETERS: ObjDesc - Field to be read 388 * FieldDatumByteOffset - Byte offset of this datum within the 389 * parent field 390 * Value - Where to store value (must be 64 bits) 391 * ReadWrite - Read or Write flag 392 * 393 * RETURN: Status 394 * 395 * DESCRIPTION: Read or Write a single datum of a field. The FieldType is 396 * demultiplexed here to handle the different types of fields 397 * (BufferField, RegionField, IndexField, BankField) 398 * 399 ******************************************************************************/ 400 401 static ACPI_STATUS 402 AcpiExFieldDatumIo ( 403 ACPI_OPERAND_OBJECT *ObjDesc, 404 UINT32 FieldDatumByteOffset, 405 UINT64 *Value, 406 UINT32 ReadWrite) 407 { 408 ACPI_STATUS Status; 409 UINT64 LocalValue; 410 411 412 ACPI_FUNCTION_TRACE_U32 (ExFieldDatumIo, FieldDatumByteOffset); 413 414 415 if (ReadWrite == ACPI_READ) 416 { 417 if (!Value) 418 { 419 LocalValue = 0; 420 421 /* To support reads without saving return value */ 422 Value = &LocalValue; 423 } 424 425 /* Clear the entire return buffer first, [Very Important!] */ 426 427 *Value = 0; 428 } 429 430 /* 431 * The four types of fields are: 432 * 433 * BufferField - Read/write from/to a Buffer 434 * RegionField - Read/write from/to a Operation Region. 435 * BankField - Write to a Bank Register, then read/write from/to an 436 * OperationRegion 437 * IndexField - Write to an Index Register, then read/write from/to a 438 * Data Register 439 */ 440 switch (ObjDesc->Common.Type) 441 { 442 case ACPI_TYPE_BUFFER_FIELD: 443 /* 444 * If the BufferField arguments have not been previously evaluated, 445 * evaluate them now and save the results. 446 */ 447 if (!(ObjDesc->Common.Flags & AOPOBJ_DATA_VALID)) 448 { 449 Status = AcpiDsGetBufferFieldArguments (ObjDesc); 450 if (ACPI_FAILURE (Status)) 451 { 452 return_ACPI_STATUS (Status); 453 } 454 } 455 456 if (ReadWrite == ACPI_READ) 457 { 458 /* 459 * Copy the data from the source buffer. 460 * Length is the field width in bytes. 461 */ 462 memcpy (Value, 463 (ObjDesc->BufferField.BufferObj)->Buffer.Pointer + 464 ObjDesc->BufferField.BaseByteOffset + 465 FieldDatumByteOffset, 466 ObjDesc->CommonField.AccessByteWidth); 467 } 468 else 469 { 470 /* 471 * Copy the data to the target buffer. 472 * Length is the field width in bytes. 473 */ 474 memcpy ((ObjDesc->BufferField.BufferObj)->Buffer.Pointer + 475 ObjDesc->BufferField.BaseByteOffset + 476 FieldDatumByteOffset, 477 Value, ObjDesc->CommonField.AccessByteWidth); 478 } 479 480 Status = AE_OK; 481 break; 482 483 case ACPI_TYPE_LOCAL_BANK_FIELD: 484 /* 485 * Ensure that the BankValue is not beyond the capacity of 486 * the register 487 */ 488 if (AcpiExRegisterOverflow (ObjDesc->BankField.BankObj, 489 (UINT64) ObjDesc->BankField.Value)) 490 { 491 return_ACPI_STATUS (AE_AML_REGISTER_LIMIT); 492 } 493 494 /* 495 * For BankFields, we must write the BankValue to the BankRegister 496 * (itself a RegionField) before we can access the data. 497 */ 498 Status = AcpiExInsertIntoField (ObjDesc->BankField.BankObj, 499 &ObjDesc->BankField.Value, 500 sizeof (ObjDesc->BankField.Value)); 501 if (ACPI_FAILURE (Status)) 502 { 503 return_ACPI_STATUS (Status); 504 } 505 506 /* 507 * Now that the Bank has been selected, fall through to the 508 * RegionField case and write the datum to the Operation Region 509 */ 510 511 /*lint -fallthrough */ 512 513 case ACPI_TYPE_LOCAL_REGION_FIELD: 514 /* 515 * For simple RegionFields, we just directly access the owning 516 * Operation Region. 517 */ 518 Status = AcpiExAccessRegion ( 519 ObjDesc, FieldDatumByteOffset, Value, ReadWrite); 520 break; 521 522 case ACPI_TYPE_LOCAL_INDEX_FIELD: 523 /* 524 * Ensure that the IndexValue is not beyond the capacity of 525 * the register 526 */ 527 if (AcpiExRegisterOverflow (ObjDesc->IndexField.IndexObj, 528 (UINT64) ObjDesc->IndexField.Value)) 529 { 530 return_ACPI_STATUS (AE_AML_REGISTER_LIMIT); 531 } 532 533 /* Write the index value to the IndexRegister (itself a RegionField) */ 534 535 FieldDatumByteOffset += ObjDesc->IndexField.Value; 536 537 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD, 538 "Write to Index Register: Value %8.8X\n", 539 FieldDatumByteOffset)); 540 541 Status = AcpiExInsertIntoField (ObjDesc->IndexField.IndexObj, 542 &FieldDatumByteOffset, sizeof (FieldDatumByteOffset)); 543 if (ACPI_FAILURE (Status)) 544 { 545 return_ACPI_STATUS (Status); 546 } 547 548 if (ReadWrite == ACPI_READ) 549 { 550 /* Read the datum from the DataRegister */ 551 552 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD, 553 "Read from Data Register\n")); 554 555 Status = AcpiExExtractFromField ( 556 ObjDesc->IndexField.DataObj, Value, sizeof (UINT64)); 557 } 558 else 559 { 560 /* Write the datum to the DataRegister */ 561 562 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD, 563 "Write to Data Register: Value %8.8X%8.8X\n", 564 ACPI_FORMAT_UINT64 (*Value))); 565 566 Status = AcpiExInsertIntoField ( 567 ObjDesc->IndexField.DataObj, Value, sizeof (UINT64)); 568 } 569 break; 570 571 default: 572 573 ACPI_ERROR ((AE_INFO, "Wrong object type in field I/O %u", 574 ObjDesc->Common.Type)); 575 Status = AE_AML_INTERNAL; 576 break; 577 } 578 579 if (ACPI_SUCCESS (Status)) 580 { 581 if (ReadWrite == ACPI_READ) 582 { 583 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD, 584 "Value Read %8.8X%8.8X, Width %u\n", 585 ACPI_FORMAT_UINT64 (*Value), 586 ObjDesc->CommonField.AccessByteWidth)); 587 } 588 else 589 { 590 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD, 591 "Value Written %8.8X%8.8X, Width %u\n", 592 ACPI_FORMAT_UINT64 (*Value), 593 ObjDesc->CommonField.AccessByteWidth)); 594 } 595 } 596 597 return_ACPI_STATUS (Status); 598 } 599 600 601 /******************************************************************************* 602 * 603 * FUNCTION: AcpiExWriteWithUpdateRule 604 * 605 * PARAMETERS: ObjDesc - Field to be written 606 * Mask - bitmask within field datum 607 * FieldValue - Value to write 608 * FieldDatumByteOffset - Offset of datum within field 609 * 610 * RETURN: Status 611 * 612 * DESCRIPTION: Apply the field update rule to a field write 613 * 614 ******************************************************************************/ 615 616 ACPI_STATUS 617 AcpiExWriteWithUpdateRule ( 618 ACPI_OPERAND_OBJECT *ObjDesc, 619 UINT64 Mask, 620 UINT64 FieldValue, 621 UINT32 FieldDatumByteOffset) 622 { 623 ACPI_STATUS Status = AE_OK; 624 UINT64 MergedValue; 625 UINT64 CurrentValue; 626 627 628 ACPI_FUNCTION_TRACE_U32 (ExWriteWithUpdateRule, Mask); 629 630 631 /* Start with the new bits */ 632 633 MergedValue = FieldValue; 634 635 /* If the mask is all ones, we don't need to worry about the update rule */ 636 637 if (Mask != ACPI_UINT64_MAX) 638 { 639 /* Decode the update rule */ 640 641 switch (ObjDesc->CommonField.FieldFlags & AML_FIELD_UPDATE_RULE_MASK) 642 { 643 case AML_FIELD_UPDATE_PRESERVE: 644 /* 645 * Check if update rule needs to be applied (not if mask is all 646 * ones) The left shift drops the bits we want to ignore. 647 */ 648 if ((~Mask << (ACPI_MUL_8 (sizeof (Mask)) - 649 ACPI_MUL_8 (ObjDesc->CommonField.AccessByteWidth))) != 0) 650 { 651 /* 652 * Read the current contents of the byte/word/dword containing 653 * the field, and merge with the new field value. 654 */ 655 Status = AcpiExFieldDatumIo ( 656 ObjDesc, FieldDatumByteOffset, &CurrentValue, ACPI_READ); 657 if (ACPI_FAILURE (Status)) 658 { 659 return_ACPI_STATUS (Status); 660 } 661 662 MergedValue |= (CurrentValue & ~Mask); 663 } 664 break; 665 666 case AML_FIELD_UPDATE_WRITE_AS_ONES: 667 668 /* Set positions outside the field to all ones */ 669 670 MergedValue |= ~Mask; 671 break; 672 673 case AML_FIELD_UPDATE_WRITE_AS_ZEROS: 674 675 /* Set positions outside the field to all zeros */ 676 677 MergedValue &= Mask; 678 break; 679 680 default: 681 682 ACPI_ERROR ((AE_INFO, 683 "Unknown UpdateRule value: 0x%X", 684 (ObjDesc->CommonField.FieldFlags & 685 AML_FIELD_UPDATE_RULE_MASK))); 686 return_ACPI_STATUS (AE_AML_OPERAND_VALUE); 687 } 688 } 689 690 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD, 691 "Mask %8.8X%8.8X, DatumOffset %X, Width %X, " 692 "Value %8.8X%8.8X, MergedValue %8.8X%8.8X\n", 693 ACPI_FORMAT_UINT64 (Mask), 694 FieldDatumByteOffset, 695 ObjDesc->CommonField.AccessByteWidth, 696 ACPI_FORMAT_UINT64 (FieldValue), 697 ACPI_FORMAT_UINT64 (MergedValue))); 698 699 /* Write the merged value */ 700 701 Status = AcpiExFieldDatumIo ( 702 ObjDesc, FieldDatumByteOffset, &MergedValue, ACPI_WRITE); 703 704 return_ACPI_STATUS (Status); 705 } 706 707 708 /******************************************************************************* 709 * 710 * FUNCTION: AcpiExExtractFromField 711 * 712 * PARAMETERS: ObjDesc - Field to be read 713 * Buffer - Where to store the field data 714 * BufferLength - Length of Buffer 715 * 716 * RETURN: Status 717 * 718 * DESCRIPTION: Retrieve the current value of the given field 719 * 720 ******************************************************************************/ 721 722 ACPI_STATUS 723 AcpiExExtractFromField ( 724 ACPI_OPERAND_OBJECT *ObjDesc, 725 void *Buffer, 726 UINT32 BufferLength) 727 { 728 ACPI_STATUS Status; 729 UINT64 RawDatum; 730 UINT64 MergedDatum; 731 UINT32 FieldOffset = 0; 732 UINT32 BufferOffset = 0; 733 UINT32 BufferTailBits; 734 UINT32 DatumCount; 735 UINT32 FieldDatumCount; 736 UINT32 AccessBitWidth; 737 UINT32 i; 738 739 740 ACPI_FUNCTION_TRACE (ExExtractFromField); 741 742 743 /* Validate target buffer and clear it */ 744 745 if (BufferLength < 746 ACPI_ROUND_BITS_UP_TO_BYTES (ObjDesc->CommonField.BitLength)) 747 { 748 ACPI_ERROR ((AE_INFO, 749 "Field size %u (bits) is too large for buffer (%u)", 750 ObjDesc->CommonField.BitLength, BufferLength)); 751 752 return_ACPI_STATUS (AE_BUFFER_OVERFLOW); 753 } 754 755 memset (Buffer, 0, BufferLength); 756 AccessBitWidth = ACPI_MUL_8 (ObjDesc->CommonField.AccessByteWidth); 757 758 /* Handle the simple case here */ 759 760 if ((ObjDesc->CommonField.StartFieldBitOffset == 0) && 761 (ObjDesc->CommonField.BitLength == AccessBitWidth)) 762 { 763 if (BufferLength >= sizeof (UINT64)) 764 { 765 Status = AcpiExFieldDatumIo (ObjDesc, 0, Buffer, ACPI_READ); 766 } 767 else 768 { 769 /* Use RawDatum (UINT64) to handle buffers < 64 bits */ 770 771 Status = AcpiExFieldDatumIo (ObjDesc, 0, &RawDatum, ACPI_READ); 772 memcpy (Buffer, &RawDatum, BufferLength); 773 } 774 775 return_ACPI_STATUS (Status); 776 } 777 778 /* TBD: Move to common setup code */ 779 780 /* Field algorithm is limited to sizeof(UINT64), truncate if needed */ 781 782 if (ObjDesc->CommonField.AccessByteWidth > sizeof (UINT64)) 783 { 784 ObjDesc->CommonField.AccessByteWidth = sizeof (UINT64); 785 AccessBitWidth = sizeof (UINT64) * 8; 786 } 787 788 /* Compute the number of datums (access width data items) */ 789 790 DatumCount = ACPI_ROUND_UP_TO ( 791 ObjDesc->CommonField.BitLength, AccessBitWidth); 792 793 FieldDatumCount = ACPI_ROUND_UP_TO ( 794 ObjDesc->CommonField.BitLength + 795 ObjDesc->CommonField.StartFieldBitOffset, AccessBitWidth); 796 797 /* Priming read from the field */ 798 799 Status = AcpiExFieldDatumIo (ObjDesc, FieldOffset, &RawDatum, ACPI_READ); 800 if (ACPI_FAILURE (Status)) 801 { 802 return_ACPI_STATUS (Status); 803 } 804 MergedDatum = RawDatum >> ObjDesc->CommonField.StartFieldBitOffset; 805 806 /* Read the rest of the field */ 807 808 for (i = 1; i < FieldDatumCount; i++) 809 { 810 /* Get next input datum from the field */ 811 812 FieldOffset += ObjDesc->CommonField.AccessByteWidth; 813 Status = AcpiExFieldDatumIo ( 814 ObjDesc, FieldOffset, &RawDatum, ACPI_READ); 815 if (ACPI_FAILURE (Status)) 816 { 817 return_ACPI_STATUS (Status); 818 } 819 820 /* 821 * Merge with previous datum if necessary. 822 * 823 * Note: Before the shift, check if the shift value will be larger than 824 * the integer size. If so, there is no need to perform the operation. 825 * This avoids the differences in behavior between different compilers 826 * concerning shift values larger than the target data width. 827 */ 828 if (AccessBitWidth - ObjDesc->CommonField.StartFieldBitOffset < 829 ACPI_INTEGER_BIT_SIZE) 830 { 831 MergedDatum |= RawDatum << 832 (AccessBitWidth - ObjDesc->CommonField.StartFieldBitOffset); 833 } 834 835 if (i == DatumCount) 836 { 837 break; 838 } 839 840 /* Write merged datum to target buffer */ 841 842 memcpy (((char *) Buffer) + BufferOffset, &MergedDatum, 843 ACPI_MIN(ObjDesc->CommonField.AccessByteWidth, 844 BufferLength - BufferOffset)); 845 846 BufferOffset += ObjDesc->CommonField.AccessByteWidth; 847 MergedDatum = RawDatum >> ObjDesc->CommonField.StartFieldBitOffset; 848 } 849 850 /* Mask off any extra bits in the last datum */ 851 852 BufferTailBits = ObjDesc->CommonField.BitLength % AccessBitWidth; 853 if (BufferTailBits) 854 { 855 MergedDatum &= ACPI_MASK_BITS_ABOVE (BufferTailBits); 856 } 857 858 /* Write the last datum to the buffer */ 859 860 memcpy (((char *) Buffer) + BufferOffset, &MergedDatum, 861 ACPI_MIN(ObjDesc->CommonField.AccessByteWidth, 862 BufferLength - BufferOffset)); 863 864 return_ACPI_STATUS (AE_OK); 865 } 866 867 868 /******************************************************************************* 869 * 870 * FUNCTION: AcpiExInsertIntoField 871 * 872 * PARAMETERS: ObjDesc - Field to be written 873 * Buffer - Data to be written 874 * BufferLength - Length of Buffer 875 * 876 * RETURN: Status 877 * 878 * DESCRIPTION: Store the Buffer contents into the given field 879 * 880 ******************************************************************************/ 881 882 ACPI_STATUS 883 AcpiExInsertIntoField ( 884 ACPI_OPERAND_OBJECT *ObjDesc, 885 void *Buffer, 886 UINT32 BufferLength) 887 { 888 void *NewBuffer; 889 ACPI_STATUS Status; 890 UINT64 Mask; 891 UINT64 WidthMask; 892 UINT64 MergedDatum; 893 UINT64 RawDatum = 0; 894 UINT32 FieldOffset = 0; 895 UINT32 BufferOffset = 0; 896 UINT32 BufferTailBits; 897 UINT32 DatumCount; 898 UINT32 FieldDatumCount; 899 UINT32 AccessBitWidth; 900 UINT32 RequiredLength; 901 UINT32 i; 902 903 904 ACPI_FUNCTION_TRACE (ExInsertIntoField); 905 906 907 /* Validate input buffer */ 908 909 NewBuffer = NULL; 910 RequiredLength = ACPI_ROUND_BITS_UP_TO_BYTES ( 911 ObjDesc->CommonField.BitLength); 912 913 /* 914 * We must have a buffer that is at least as long as the field 915 * we are writing to. This is because individual fields are 916 * indivisible and partial writes are not supported -- as per 917 * the ACPI specification. 918 */ 919 if (BufferLength < RequiredLength) 920 { 921 /* We need to create a new buffer */ 922 923 NewBuffer = ACPI_ALLOCATE_ZEROED (RequiredLength); 924 if (!NewBuffer) 925 { 926 return_ACPI_STATUS (AE_NO_MEMORY); 927 } 928 929 /* 930 * Copy the original data to the new buffer, starting 931 * at Byte zero. All unused (upper) bytes of the 932 * buffer will be 0. 933 */ 934 memcpy ((char *) NewBuffer, (char *) Buffer, BufferLength); 935 Buffer = NewBuffer; 936 BufferLength = RequiredLength; 937 } 938 939 /* TBD: Move to common setup code */ 940 941 /* Algo is limited to sizeof(UINT64), so cut the AccessByteWidth */ 942 if (ObjDesc->CommonField.AccessByteWidth > sizeof (UINT64)) 943 { 944 ObjDesc->CommonField.AccessByteWidth = sizeof (UINT64); 945 } 946 947 AccessBitWidth = ACPI_MUL_8 (ObjDesc->CommonField.AccessByteWidth); 948 949 /* 950 * Create the bitmasks used for bit insertion. 951 * Note: This if/else is used to bypass compiler differences with the 952 * shift operator 953 */ 954 if (AccessBitWidth == ACPI_INTEGER_BIT_SIZE) 955 { 956 WidthMask = ACPI_UINT64_MAX; 957 } 958 else 959 { 960 WidthMask = ACPI_MASK_BITS_ABOVE (AccessBitWidth); 961 } 962 963 Mask = WidthMask & 964 ACPI_MASK_BITS_BELOW (ObjDesc->CommonField.StartFieldBitOffset); 965 966 /* Compute the number of datums (access width data items) */ 967 968 DatumCount = ACPI_ROUND_UP_TO (ObjDesc->CommonField.BitLength, 969 AccessBitWidth); 970 971 FieldDatumCount = ACPI_ROUND_UP_TO (ObjDesc->CommonField.BitLength + 972 ObjDesc->CommonField.StartFieldBitOffset, 973 AccessBitWidth); 974 975 /* Get initial Datum from the input buffer */ 976 977 memcpy (&RawDatum, Buffer, 978 ACPI_MIN(ObjDesc->CommonField.AccessByteWidth, 979 BufferLength - BufferOffset)); 980 981 MergedDatum = RawDatum << ObjDesc->CommonField.StartFieldBitOffset; 982 983 /* Write the entire field */ 984 985 for (i = 1; i < FieldDatumCount; i++) 986 { 987 /* Write merged datum to the target field */ 988 989 MergedDatum &= Mask; 990 Status = AcpiExWriteWithUpdateRule ( 991 ObjDesc, Mask, MergedDatum, FieldOffset); 992 if (ACPI_FAILURE (Status)) 993 { 994 goto Exit; 995 } 996 997 FieldOffset += ObjDesc->CommonField.AccessByteWidth; 998 999 /* 1000 * Start new output datum by merging with previous input datum 1001 * if necessary. 1002 * 1003 * Note: Before the shift, check if the shift value will be larger than 1004 * the integer size. If so, there is no need to perform the operation. 1005 * This avoids the differences in behavior between different compilers 1006 * concerning shift values larger than the target data width. 1007 */ 1008 if ((AccessBitWidth - ObjDesc->CommonField.StartFieldBitOffset) < 1009 ACPI_INTEGER_BIT_SIZE) 1010 { 1011 MergedDatum = RawDatum >> 1012 (AccessBitWidth - ObjDesc->CommonField.StartFieldBitOffset); 1013 } 1014 else 1015 { 1016 MergedDatum = 0; 1017 } 1018 1019 Mask = WidthMask; 1020 1021 if (i == DatumCount) 1022 { 1023 break; 1024 } 1025 1026 /* Get the next input datum from the buffer */ 1027 1028 BufferOffset += ObjDesc->CommonField.AccessByteWidth; 1029 memcpy (&RawDatum, ((char *) Buffer) + BufferOffset, 1030 ACPI_MIN(ObjDesc->CommonField.AccessByteWidth, 1031 BufferLength - BufferOffset)); 1032 1033 MergedDatum |= RawDatum << ObjDesc->CommonField.StartFieldBitOffset; 1034 } 1035 1036 /* Mask off any extra bits in the last datum */ 1037 1038 BufferTailBits = (ObjDesc->CommonField.BitLength + 1039 ObjDesc->CommonField.StartFieldBitOffset) % AccessBitWidth; 1040 if (BufferTailBits) 1041 { 1042 Mask &= ACPI_MASK_BITS_ABOVE (BufferTailBits); 1043 } 1044 1045 /* Write the last datum to the field */ 1046 1047 MergedDatum &= Mask; 1048 Status = AcpiExWriteWithUpdateRule ( 1049 ObjDesc, Mask, MergedDatum, FieldOffset); 1050 1051 Exit: 1052 /* Free temporary buffer if we used one */ 1053 1054 if (NewBuffer) 1055 { 1056 ACPI_FREE (NewBuffer); 1057 } 1058 return_ACPI_STATUS (Status); 1059 } 1060