1 /****************************************************************************** 2 * 3 * Module Name: exfldio - Aml Field I/O 4 * 5 *****************************************************************************/ 6 7 /****************************************************************************** 8 * 9 * 1. Copyright Notice 10 * 11 * Some or all of this work - Copyright (c) 1999 - 2018, Intel Corp. 12 * All rights reserved. 13 * 14 * 2. License 15 * 16 * 2.1. This is your license from Intel Corp. under its intellectual property 17 * rights. You may have additional license terms from the party that provided 18 * you this software, covering your right to use that party's intellectual 19 * property rights. 20 * 21 * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a 22 * copy of the source code appearing in this file ("Covered Code") an 23 * irrevocable, perpetual, worldwide license under Intel's copyrights in the 24 * base code distributed originally by Intel ("Original Intel Code") to copy, 25 * make derivatives, distribute, use and display any portion of the Covered 26 * Code in any form, with the right to sublicense such rights; and 27 * 28 * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent 29 * license (with the right to sublicense), under only those claims of Intel 30 * patents that are infringed by the Original Intel Code, to make, use, sell, 31 * offer to sell, and import the Covered Code and derivative works thereof 32 * solely to the minimum extent necessary to exercise the above copyright 33 * license, and in no event shall the patent license extend to any additions 34 * to or modifications of the Original Intel Code. No other license or right 35 * is granted directly or by implication, estoppel or otherwise; 36 * 37 * The above copyright and patent license is granted only if the following 38 * conditions are met: 39 * 40 * 3. Conditions 41 * 42 * 3.1. Redistribution of Source with Rights to Further Distribute Source. 43 * Redistribution of source code of any substantial portion of the Covered 44 * Code or modification with rights to further distribute source must include 45 * the above Copyright Notice, the above License, this list of Conditions, 46 * and the following Disclaimer and Export Compliance provision. In addition, 47 * Licensee must cause all Covered Code to which Licensee contributes to 48 * contain a file documenting the changes Licensee made to create that Covered 49 * Code and the date of any change. Licensee must include in that file the 50 * documentation of any changes made by any predecessor Licensee. Licensee 51 * must include a prominent statement that the modification is derived, 52 * directly or indirectly, from Original Intel Code. 53 * 54 * 3.2. Redistribution of Source with no Rights to Further Distribute Source. 55 * Redistribution of source code of any substantial portion of the Covered 56 * Code or modification without rights to further distribute source must 57 * include the following Disclaimer and Export Compliance provision in the 58 * documentation and/or other materials provided with distribution. In 59 * addition, Licensee may not authorize further sublicense of source of any 60 * portion of the Covered Code, and must include terms to the effect that the 61 * license from Licensee to its licensee is limited to the intellectual 62 * property embodied in the software Licensee provides to its licensee, and 63 * not to intellectual property embodied in modifications its licensee may 64 * make. 65 * 66 * 3.3. Redistribution of Executable. Redistribution in executable form of any 67 * substantial portion of the Covered Code or modification must reproduce the 68 * above Copyright Notice, and the following Disclaimer and Export Compliance 69 * provision in the documentation and/or other materials provided with the 70 * distribution. 71 * 72 * 3.4. Intel retains all right, title, and interest in and to the Original 73 * Intel Code. 74 * 75 * 3.5. Neither the name Intel nor any other trademark owned or controlled by 76 * Intel shall be used in advertising or otherwise to promote the sale, use or 77 * other dealings in products derived from or relating to the Covered Code 78 * without prior written authorization from Intel. 79 * 80 * 4. Disclaimer and Export Compliance 81 * 82 * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED 83 * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE 84 * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE, 85 * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY 86 * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY 87 * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A 88 * PARTICULAR PURPOSE. 89 * 90 * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES 91 * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR 92 * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT, 93 * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY 94 * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL 95 * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS 96 * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY 97 * LIMITED REMEDY. 98 * 99 * 4.3. Licensee shall not export, either directly or indirectly, any of this 100 * software or system incorporating such software without first obtaining any 101 * required license or other approval from the U. S. Department of Commerce or 102 * any other agency or department of the United States Government. In the 103 * event Licensee exports any such software from the United States or 104 * re-exports any such software from a foreign destination, Licensee shall 105 * ensure that the distribution and export/re-export of the software is in 106 * compliance with all laws, regulations, orders, or other restrictions of the 107 * U.S. Export Administration Regulations. Licensee agrees that neither it nor 108 * any of its subsidiaries will export/re-export any technical data, process, 109 * software, or service, directly or indirectly, to any country for which the 110 * United States government or any agency thereof requires an export license, 111 * other governmental approval, or letter of assurance, without first obtaining 112 * such license, approval or letter. 113 * 114 ***************************************************************************** 115 * 116 * Alternatively, you may choose to be licensed under the terms of the 117 * following license: 118 * 119 * Redistribution and use in source and binary forms, with or without 120 * modification, are permitted provided that the following conditions 121 * are met: 122 * 1. Redistributions of source code must retain the above copyright 123 * notice, this list of conditions, and the following disclaimer, 124 * without modification. 125 * 2. Redistributions in binary form must reproduce at minimum a disclaimer 126 * substantially similar to the "NO WARRANTY" disclaimer below 127 * ("Disclaimer") and any redistribution must be conditioned upon 128 * including a substantially similar Disclaimer requirement for further 129 * binary redistribution. 130 * 3. Neither the names of the above-listed copyright holders nor the names 131 * of any contributors may be used to endorse or promote products derived 132 * from this software without specific prior written permission. 133 * 134 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 135 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 136 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 137 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 138 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 139 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 140 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 141 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 142 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 143 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 144 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 145 * 146 * Alternatively, you may choose to be licensed under the terms of the 147 * GNU General Public License ("GPL") version 2 as published by the Free 148 * Software Foundation. 149 * 150 *****************************************************************************/ 151 152 #include "acpi.h" 153 #include "accommon.h" 154 #include "acinterp.h" 155 #include "amlcode.h" 156 #include "acevents.h" 157 #include "acdispat.h" 158 159 160 #define _COMPONENT ACPI_EXECUTER 161 ACPI_MODULE_NAME ("exfldio") 162 163 /* Local prototypes */ 164 165 static ACPI_STATUS 166 AcpiExFieldDatumIo ( 167 ACPI_OPERAND_OBJECT *ObjDesc, 168 UINT32 FieldDatumByteOffset, 169 UINT64 *Value, 170 UINT32 ReadWrite); 171 172 static BOOLEAN 173 AcpiExRegisterOverflow ( 174 ACPI_OPERAND_OBJECT *ObjDesc, 175 UINT64 Value); 176 177 static ACPI_STATUS 178 AcpiExSetupRegion ( 179 ACPI_OPERAND_OBJECT *ObjDesc, 180 UINT32 FieldDatumByteOffset); 181 182 183 /******************************************************************************* 184 * 185 * FUNCTION: AcpiExSetupRegion 186 * 187 * PARAMETERS: ObjDesc - Field to be read or written 188 * FieldDatumByteOffset - Byte offset of this datum within the 189 * parent field 190 * 191 * RETURN: Status 192 * 193 * DESCRIPTION: Common processing for AcpiExExtractFromField and 194 * AcpiExInsertIntoField. Initialize the Region if necessary and 195 * validate the request. 196 * 197 ******************************************************************************/ 198 199 static ACPI_STATUS 200 AcpiExSetupRegion ( 201 ACPI_OPERAND_OBJECT *ObjDesc, 202 UINT32 FieldDatumByteOffset) 203 { 204 ACPI_STATUS Status = AE_OK; 205 ACPI_OPERAND_OBJECT *RgnDesc; 206 UINT8 SpaceId; 207 208 209 ACPI_FUNCTION_TRACE_U32 (ExSetupRegion, FieldDatumByteOffset); 210 211 212 RgnDesc = ObjDesc->CommonField.RegionObj; 213 214 /* We must have a valid region */ 215 216 if (RgnDesc->Common.Type != ACPI_TYPE_REGION) 217 { 218 ACPI_ERROR ((AE_INFO, "Needed Region, found type 0x%X (%s)", 219 RgnDesc->Common.Type, 220 AcpiUtGetObjectTypeName (RgnDesc))); 221 222 return_ACPI_STATUS (AE_AML_OPERAND_TYPE); 223 } 224 225 SpaceId = RgnDesc->Region.SpaceId; 226 227 /* Validate the Space ID */ 228 229 if (!AcpiIsValidSpaceId (SpaceId)) 230 { 231 ACPI_ERROR ((AE_INFO, 232 "Invalid/unknown Address Space ID: 0x%2.2X", SpaceId)); 233 return_ACPI_STATUS (AE_AML_INVALID_SPACE_ID); 234 } 235 236 /* 237 * If the Region Address and Length have not been previously evaluated, 238 * evaluate them now and save the results. 239 */ 240 if (!(RgnDesc->Common.Flags & AOPOBJ_DATA_VALID)) 241 { 242 Status = AcpiDsGetRegionArguments (RgnDesc); 243 if (ACPI_FAILURE (Status)) 244 { 245 return_ACPI_STATUS (Status); 246 } 247 } 248 249 /* 250 * Exit now for SMBus, GSBus or IPMI address space, it has a non-linear 251 * address space and the request cannot be directly validated 252 */ 253 if (SpaceId == ACPI_ADR_SPACE_SMBUS || 254 SpaceId == ACPI_ADR_SPACE_GSBUS || 255 SpaceId == ACPI_ADR_SPACE_IPMI) 256 { 257 /* SMBus or IPMI has a non-linear address space */ 258 259 return_ACPI_STATUS (AE_OK); 260 } 261 262 #ifdef ACPI_UNDER_DEVELOPMENT 263 /* 264 * If the Field access is AnyAcc, we can now compute the optimal 265 * access (because we know know the length of the parent region) 266 */ 267 if (!(ObjDesc->Common.Flags & AOPOBJ_DATA_VALID)) 268 { 269 if (ACPI_FAILURE (Status)) 270 { 271 return_ACPI_STATUS (Status); 272 } 273 } 274 #endif 275 276 /* 277 * Validate the request. The entire request from the byte offset for a 278 * length of one field datum (access width) must fit within the region. 279 * (Region length is specified in bytes) 280 */ 281 if (RgnDesc->Region.Length < 282 (ObjDesc->CommonField.BaseByteOffset + FieldDatumByteOffset + 283 ObjDesc->CommonField.AccessByteWidth)) 284 { 285 if (AcpiGbl_EnableInterpreterSlack) 286 { 287 /* 288 * Slack mode only: We will go ahead and allow access to this 289 * field if it is within the region length rounded up to the next 290 * access width boundary. ACPI_SIZE cast for 64-bit compile. 291 */ 292 if (ACPI_ROUND_UP (RgnDesc->Region.Length, 293 ObjDesc->CommonField.AccessByteWidth) >= 294 ((ACPI_SIZE) ObjDesc->CommonField.BaseByteOffset + 295 ObjDesc->CommonField.AccessByteWidth + 296 FieldDatumByteOffset)) 297 { 298 return_ACPI_STATUS (AE_OK); 299 } 300 } 301 302 if (RgnDesc->Region.Length < ObjDesc->CommonField.AccessByteWidth) 303 { 304 /* 305 * This is the case where the AccessType (AccWord, etc.) is wider 306 * than the region itself. For example, a region of length one 307 * byte, and a field with Dword access specified. 308 */ 309 ACPI_ERROR ((AE_INFO, 310 "Field [%4.4s] access width (%u bytes) " 311 "too large for region [%4.4s] (length %u)", 312 AcpiUtGetNodeName (ObjDesc->CommonField.Node), 313 ObjDesc->CommonField.AccessByteWidth, 314 AcpiUtGetNodeName (RgnDesc->Region.Node), 315 RgnDesc->Region.Length)); 316 } 317 318 /* 319 * Offset rounded up to next multiple of field width 320 * exceeds region length, indicate an error 321 */ 322 ACPI_ERROR ((AE_INFO, 323 "Field [%4.4s] Base+Offset+Width %u+%u+%u " 324 "is beyond end of region [%4.4s] (length %u)", 325 AcpiUtGetNodeName (ObjDesc->CommonField.Node), 326 ObjDesc->CommonField.BaseByteOffset, 327 FieldDatumByteOffset, ObjDesc->CommonField.AccessByteWidth, 328 AcpiUtGetNodeName (RgnDesc->Region.Node), 329 RgnDesc->Region.Length)); 330 331 return_ACPI_STATUS (AE_AML_REGION_LIMIT); 332 } 333 334 return_ACPI_STATUS (AE_OK); 335 } 336 337 338 /******************************************************************************* 339 * 340 * FUNCTION: AcpiExAccessRegion 341 * 342 * PARAMETERS: ObjDesc - Field to be read 343 * FieldDatumByteOffset - Byte offset of this datum within the 344 * parent field 345 * Value - Where to store value (must at least 346 * 64 bits) 347 * Function - Read or Write flag plus other region- 348 * dependent flags 349 * 350 * RETURN: Status 351 * 352 * DESCRIPTION: Read or Write a single field datum to an Operation Region. 353 * 354 ******************************************************************************/ 355 356 ACPI_STATUS 357 AcpiExAccessRegion ( 358 ACPI_OPERAND_OBJECT *ObjDesc, 359 UINT32 FieldDatumByteOffset, 360 UINT64 *Value, 361 UINT32 Function) 362 { 363 ACPI_STATUS Status; 364 ACPI_OPERAND_OBJECT *RgnDesc; 365 UINT32 RegionOffset; 366 367 368 ACPI_FUNCTION_TRACE (ExAccessRegion); 369 370 371 /* 372 * Ensure that the region operands are fully evaluated and verify 373 * the validity of the request 374 */ 375 Status = AcpiExSetupRegion (ObjDesc, FieldDatumByteOffset); 376 if (ACPI_FAILURE (Status)) 377 { 378 return_ACPI_STATUS (Status); 379 } 380 381 /* 382 * The physical address of this field datum is: 383 * 384 * 1) The base of the region, plus 385 * 2) The base offset of the field, plus 386 * 3) The current offset into the field 387 */ 388 RgnDesc = ObjDesc->CommonField.RegionObj; 389 RegionOffset = 390 ObjDesc->CommonField.BaseByteOffset + 391 FieldDatumByteOffset; 392 393 if ((Function & ACPI_IO_MASK) == ACPI_READ) 394 { 395 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD, "[READ]")); 396 } 397 else 398 { 399 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD, "[WRITE]")); 400 } 401 402 ACPI_DEBUG_PRINT_RAW ((ACPI_DB_BFIELD, 403 " Region [%s:%X], Width %X, ByteBase %X, Offset %X at %8.8X%8.8X\n", 404 AcpiUtGetRegionName (RgnDesc->Region.SpaceId), 405 RgnDesc->Region.SpaceId, 406 ObjDesc->CommonField.AccessByteWidth, 407 ObjDesc->CommonField.BaseByteOffset, 408 FieldDatumByteOffset, 409 ACPI_FORMAT_UINT64 (RgnDesc->Region.Address + RegionOffset))); 410 411 /* Invoke the appropriate AddressSpace/OpRegion handler */ 412 413 Status = AcpiEvAddressSpaceDispatch (RgnDesc, ObjDesc, 414 Function, RegionOffset, 415 ACPI_MUL_8 (ObjDesc->CommonField.AccessByteWidth), Value); 416 417 if (ACPI_FAILURE (Status)) 418 { 419 if (Status == AE_NOT_IMPLEMENTED) 420 { 421 ACPI_ERROR ((AE_INFO, 422 "Region %s (ID=%u) not implemented", 423 AcpiUtGetRegionName (RgnDesc->Region.SpaceId), 424 RgnDesc->Region.SpaceId)); 425 } 426 else if (Status == AE_NOT_EXIST) 427 { 428 ACPI_ERROR ((AE_INFO, 429 "Region %s (ID=%u) has no handler", 430 AcpiUtGetRegionName (RgnDesc->Region.SpaceId), 431 RgnDesc->Region.SpaceId)); 432 } 433 } 434 435 return_ACPI_STATUS (Status); 436 } 437 438 439 /******************************************************************************* 440 * 441 * FUNCTION: AcpiExRegisterOverflow 442 * 443 * PARAMETERS: ObjDesc - Register(Field) to be written 444 * Value - Value to be stored 445 * 446 * RETURN: TRUE if value overflows the field, FALSE otherwise 447 * 448 * DESCRIPTION: Check if a value is out of range of the field being written. 449 * Used to check if the values written to Index and Bank registers 450 * are out of range. Normally, the value is simply truncated 451 * to fit the field, but this case is most likely a serious 452 * coding error in the ASL. 453 * 454 ******************************************************************************/ 455 456 static BOOLEAN 457 AcpiExRegisterOverflow ( 458 ACPI_OPERAND_OBJECT *ObjDesc, 459 UINT64 Value) 460 { 461 462 if (ObjDesc->CommonField.BitLength >= ACPI_INTEGER_BIT_SIZE) 463 { 464 /* 465 * The field is large enough to hold the maximum integer, so we can 466 * never overflow it. 467 */ 468 return (FALSE); 469 } 470 471 if (Value >= ((UINT64) 1 << ObjDesc->CommonField.BitLength)) 472 { 473 /* 474 * The Value is larger than the maximum value that can fit into 475 * the register. 476 */ 477 ACPI_ERROR ((AE_INFO, 478 "Index value 0x%8.8X%8.8X overflows field width 0x%X", 479 ACPI_FORMAT_UINT64 (Value), 480 ObjDesc->CommonField.BitLength)); 481 482 return (TRUE); 483 } 484 485 /* The Value will fit into the field with no truncation */ 486 487 return (FALSE); 488 } 489 490 491 /******************************************************************************* 492 * 493 * FUNCTION: AcpiExFieldDatumIo 494 * 495 * PARAMETERS: ObjDesc - Field to be read 496 * FieldDatumByteOffset - Byte offset of this datum within the 497 * parent field 498 * Value - Where to store value (must be 64 bits) 499 * ReadWrite - Read or Write flag 500 * 501 * RETURN: Status 502 * 503 * DESCRIPTION: Read or Write a single datum of a field. The FieldType is 504 * demultiplexed here to handle the different types of fields 505 * (BufferField, RegionField, IndexField, BankField) 506 * 507 ******************************************************************************/ 508 509 static ACPI_STATUS 510 AcpiExFieldDatumIo ( 511 ACPI_OPERAND_OBJECT *ObjDesc, 512 UINT32 FieldDatumByteOffset, 513 UINT64 *Value, 514 UINT32 ReadWrite) 515 { 516 ACPI_STATUS Status; 517 UINT64 LocalValue; 518 519 520 ACPI_FUNCTION_TRACE_U32 (ExFieldDatumIo, FieldDatumByteOffset); 521 522 523 if (ReadWrite == ACPI_READ) 524 { 525 if (!Value) 526 { 527 LocalValue = 0; 528 529 /* To support reads without saving return value */ 530 Value = &LocalValue; 531 } 532 533 /* Clear the entire return buffer first, [Very Important!] */ 534 535 *Value = 0; 536 } 537 538 /* 539 * The four types of fields are: 540 * 541 * BufferField - Read/write from/to a Buffer 542 * RegionField - Read/write from/to a Operation Region. 543 * BankField - Write to a Bank Register, then read/write from/to an 544 * OperationRegion 545 * IndexField - Write to an Index Register, then read/write from/to a 546 * Data Register 547 */ 548 switch (ObjDesc->Common.Type) 549 { 550 case ACPI_TYPE_BUFFER_FIELD: 551 /* 552 * If the BufferField arguments have not been previously evaluated, 553 * evaluate them now and save the results. 554 */ 555 if (!(ObjDesc->Common.Flags & AOPOBJ_DATA_VALID)) 556 { 557 Status = AcpiDsGetBufferFieldArguments (ObjDesc); 558 if (ACPI_FAILURE (Status)) 559 { 560 return_ACPI_STATUS (Status); 561 } 562 } 563 564 if (ReadWrite == ACPI_READ) 565 { 566 /* 567 * Copy the data from the source buffer. 568 * Length is the field width in bytes. 569 */ 570 memcpy (Value, 571 (ObjDesc->BufferField.BufferObj)->Buffer.Pointer + 572 ObjDesc->BufferField.BaseByteOffset + 573 FieldDatumByteOffset, 574 ObjDesc->CommonField.AccessByteWidth); 575 } 576 else 577 { 578 /* 579 * Copy the data to the target buffer. 580 * Length is the field width in bytes. 581 */ 582 memcpy ((ObjDesc->BufferField.BufferObj)->Buffer.Pointer + 583 ObjDesc->BufferField.BaseByteOffset + 584 FieldDatumByteOffset, 585 Value, ObjDesc->CommonField.AccessByteWidth); 586 } 587 588 Status = AE_OK; 589 break; 590 591 case ACPI_TYPE_LOCAL_BANK_FIELD: 592 /* 593 * Ensure that the BankValue is not beyond the capacity of 594 * the register 595 */ 596 if (AcpiExRegisterOverflow (ObjDesc->BankField.BankObj, 597 (UINT64) ObjDesc->BankField.Value)) 598 { 599 return_ACPI_STATUS (AE_AML_REGISTER_LIMIT); 600 } 601 602 /* 603 * For BankFields, we must write the BankValue to the BankRegister 604 * (itself a RegionField) before we can access the data. 605 */ 606 Status = AcpiExInsertIntoField (ObjDesc->BankField.BankObj, 607 &ObjDesc->BankField.Value, 608 sizeof (ObjDesc->BankField.Value)); 609 if (ACPI_FAILURE (Status)) 610 { 611 return_ACPI_STATUS (Status); 612 } 613 614 /* 615 * Now that the Bank has been selected, fall through to the 616 * RegionField case and write the datum to the Operation Region 617 */ 618 619 /*lint -fallthrough */ 620 621 case ACPI_TYPE_LOCAL_REGION_FIELD: 622 /* 623 * For simple RegionFields, we just directly access the owning 624 * Operation Region. 625 */ 626 Status = AcpiExAccessRegion ( 627 ObjDesc, FieldDatumByteOffset, Value, ReadWrite); 628 break; 629 630 case ACPI_TYPE_LOCAL_INDEX_FIELD: 631 /* 632 * Ensure that the IndexValue is not beyond the capacity of 633 * the register 634 */ 635 if (AcpiExRegisterOverflow (ObjDesc->IndexField.IndexObj, 636 (UINT64) ObjDesc->IndexField.Value)) 637 { 638 return_ACPI_STATUS (AE_AML_REGISTER_LIMIT); 639 } 640 641 /* Write the index value to the IndexRegister (itself a RegionField) */ 642 643 FieldDatumByteOffset += ObjDesc->IndexField.Value; 644 645 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD, 646 "Write to Index Register: Value %8.8X\n", 647 FieldDatumByteOffset)); 648 649 Status = AcpiExInsertIntoField (ObjDesc->IndexField.IndexObj, 650 &FieldDatumByteOffset, sizeof (FieldDatumByteOffset)); 651 if (ACPI_FAILURE (Status)) 652 { 653 return_ACPI_STATUS (Status); 654 } 655 656 if (ReadWrite == ACPI_READ) 657 { 658 /* Read the datum from the DataRegister */ 659 660 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD, 661 "Read from Data Register\n")); 662 663 Status = AcpiExExtractFromField ( 664 ObjDesc->IndexField.DataObj, Value, sizeof (UINT64)); 665 } 666 else 667 { 668 /* Write the datum to the DataRegister */ 669 670 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD, 671 "Write to Data Register: Value %8.8X%8.8X\n", 672 ACPI_FORMAT_UINT64 (*Value))); 673 674 Status = AcpiExInsertIntoField ( 675 ObjDesc->IndexField.DataObj, Value, sizeof (UINT64)); 676 } 677 break; 678 679 default: 680 681 ACPI_ERROR ((AE_INFO, "Wrong object type in field I/O %u", 682 ObjDesc->Common.Type)); 683 Status = AE_AML_INTERNAL; 684 break; 685 } 686 687 if (ACPI_SUCCESS (Status)) 688 { 689 if (ReadWrite == ACPI_READ) 690 { 691 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD, 692 "Value Read %8.8X%8.8X, Width %u\n", 693 ACPI_FORMAT_UINT64 (*Value), 694 ObjDesc->CommonField.AccessByteWidth)); 695 } 696 else 697 { 698 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD, 699 "Value Written %8.8X%8.8X, Width %u\n", 700 ACPI_FORMAT_UINT64 (*Value), 701 ObjDesc->CommonField.AccessByteWidth)); 702 } 703 } 704 705 return_ACPI_STATUS (Status); 706 } 707 708 709 /******************************************************************************* 710 * 711 * FUNCTION: AcpiExWriteWithUpdateRule 712 * 713 * PARAMETERS: ObjDesc - Field to be written 714 * Mask - bitmask within field datum 715 * FieldValue - Value to write 716 * FieldDatumByteOffset - Offset of datum within field 717 * 718 * RETURN: Status 719 * 720 * DESCRIPTION: Apply the field update rule to a field write 721 * 722 ******************************************************************************/ 723 724 ACPI_STATUS 725 AcpiExWriteWithUpdateRule ( 726 ACPI_OPERAND_OBJECT *ObjDesc, 727 UINT64 Mask, 728 UINT64 FieldValue, 729 UINT32 FieldDatumByteOffset) 730 { 731 ACPI_STATUS Status = AE_OK; 732 UINT64 MergedValue; 733 UINT64 CurrentValue; 734 735 736 ACPI_FUNCTION_TRACE_U32 (ExWriteWithUpdateRule, Mask); 737 738 739 /* Start with the new bits */ 740 741 MergedValue = FieldValue; 742 743 /* If the mask is all ones, we don't need to worry about the update rule */ 744 745 if (Mask != ACPI_UINT64_MAX) 746 { 747 /* Decode the update rule */ 748 749 switch (ObjDesc->CommonField.FieldFlags & AML_FIELD_UPDATE_RULE_MASK) 750 { 751 case AML_FIELD_UPDATE_PRESERVE: 752 /* 753 * Check if update rule needs to be applied (not if mask is all 754 * ones) The left shift drops the bits we want to ignore. 755 */ 756 if ((~Mask << (ACPI_MUL_8 (sizeof (Mask)) - 757 ACPI_MUL_8 (ObjDesc->CommonField.AccessByteWidth))) != 0) 758 { 759 /* 760 * Read the current contents of the byte/word/dword containing 761 * the field, and merge with the new field value. 762 */ 763 Status = AcpiExFieldDatumIo ( 764 ObjDesc, FieldDatumByteOffset, &CurrentValue, ACPI_READ); 765 if (ACPI_FAILURE (Status)) 766 { 767 return_ACPI_STATUS (Status); 768 } 769 770 MergedValue |= (CurrentValue & ~Mask); 771 } 772 break; 773 774 case AML_FIELD_UPDATE_WRITE_AS_ONES: 775 776 /* Set positions outside the field to all ones */ 777 778 MergedValue |= ~Mask; 779 break; 780 781 case AML_FIELD_UPDATE_WRITE_AS_ZEROS: 782 783 /* Set positions outside the field to all zeros */ 784 785 MergedValue &= Mask; 786 break; 787 788 default: 789 790 ACPI_ERROR ((AE_INFO, 791 "Unknown UpdateRule value: 0x%X", 792 (ObjDesc->CommonField.FieldFlags & 793 AML_FIELD_UPDATE_RULE_MASK))); 794 return_ACPI_STATUS (AE_AML_OPERAND_VALUE); 795 } 796 } 797 798 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD, 799 "Mask %8.8X%8.8X, DatumOffset %X, Width %X, " 800 "Value %8.8X%8.8X, MergedValue %8.8X%8.8X\n", 801 ACPI_FORMAT_UINT64 (Mask), 802 FieldDatumByteOffset, 803 ObjDesc->CommonField.AccessByteWidth, 804 ACPI_FORMAT_UINT64 (FieldValue), 805 ACPI_FORMAT_UINT64 (MergedValue))); 806 807 /* Write the merged value */ 808 809 Status = AcpiExFieldDatumIo ( 810 ObjDesc, FieldDatumByteOffset, &MergedValue, ACPI_WRITE); 811 812 return_ACPI_STATUS (Status); 813 } 814 815 816 /******************************************************************************* 817 * 818 * FUNCTION: AcpiExExtractFromField 819 * 820 * PARAMETERS: ObjDesc - Field to be read 821 * Buffer - Where to store the field data 822 * BufferLength - Length of Buffer 823 * 824 * RETURN: Status 825 * 826 * DESCRIPTION: Retrieve the current value of the given field 827 * 828 ******************************************************************************/ 829 830 ACPI_STATUS 831 AcpiExExtractFromField ( 832 ACPI_OPERAND_OBJECT *ObjDesc, 833 void *Buffer, 834 UINT32 BufferLength) 835 { 836 ACPI_STATUS Status; 837 UINT64 RawDatum; 838 UINT64 MergedDatum; 839 UINT32 FieldOffset = 0; 840 UINT32 BufferOffset = 0; 841 UINT32 BufferTailBits; 842 UINT32 DatumCount; 843 UINT32 FieldDatumCount; 844 UINT32 AccessBitWidth; 845 UINT32 i; 846 847 848 ACPI_FUNCTION_TRACE (ExExtractFromField); 849 850 851 /* Validate target buffer and clear it */ 852 853 if (BufferLength < 854 ACPI_ROUND_BITS_UP_TO_BYTES (ObjDesc->CommonField.BitLength)) 855 { 856 ACPI_ERROR ((AE_INFO, 857 "Field size %u (bits) is too large for buffer (%u)", 858 ObjDesc->CommonField.BitLength, BufferLength)); 859 860 return_ACPI_STATUS (AE_BUFFER_OVERFLOW); 861 } 862 863 memset (Buffer, 0, BufferLength); 864 AccessBitWidth = ACPI_MUL_8 (ObjDesc->CommonField.AccessByteWidth); 865 866 /* Handle the simple case here */ 867 868 if ((ObjDesc->CommonField.StartFieldBitOffset == 0) && 869 (ObjDesc->CommonField.BitLength == AccessBitWidth)) 870 { 871 if (BufferLength >= sizeof (UINT64)) 872 { 873 Status = AcpiExFieldDatumIo (ObjDesc, 0, Buffer, ACPI_READ); 874 } 875 else 876 { 877 /* Use RawDatum (UINT64) to handle buffers < 64 bits */ 878 879 Status = AcpiExFieldDatumIo (ObjDesc, 0, &RawDatum, ACPI_READ); 880 memcpy (Buffer, &RawDatum, BufferLength); 881 } 882 883 return_ACPI_STATUS (Status); 884 } 885 886 /* TBD: Move to common setup code */ 887 888 /* Field algorithm is limited to sizeof(UINT64), truncate if needed */ 889 890 if (ObjDesc->CommonField.AccessByteWidth > sizeof (UINT64)) 891 { 892 ObjDesc->CommonField.AccessByteWidth = sizeof (UINT64); 893 AccessBitWidth = sizeof (UINT64) * 8; 894 } 895 896 /* Compute the number of datums (access width data items) */ 897 898 DatumCount = ACPI_ROUND_UP_TO ( 899 ObjDesc->CommonField.BitLength, AccessBitWidth); 900 901 FieldDatumCount = ACPI_ROUND_UP_TO ( 902 ObjDesc->CommonField.BitLength + 903 ObjDesc->CommonField.StartFieldBitOffset, AccessBitWidth); 904 905 /* Priming read from the field */ 906 907 Status = AcpiExFieldDatumIo (ObjDesc, FieldOffset, &RawDatum, ACPI_READ); 908 if (ACPI_FAILURE (Status)) 909 { 910 return_ACPI_STATUS (Status); 911 } 912 MergedDatum = RawDatum >> ObjDesc->CommonField.StartFieldBitOffset; 913 914 /* Read the rest of the field */ 915 916 for (i = 1; i < FieldDatumCount; i++) 917 { 918 /* Get next input datum from the field */ 919 920 FieldOffset += ObjDesc->CommonField.AccessByteWidth; 921 Status = AcpiExFieldDatumIo ( 922 ObjDesc, FieldOffset, &RawDatum, ACPI_READ); 923 if (ACPI_FAILURE (Status)) 924 { 925 return_ACPI_STATUS (Status); 926 } 927 928 /* 929 * Merge with previous datum if necessary. 930 * 931 * Note: Before the shift, check if the shift value will be larger than 932 * the integer size. If so, there is no need to perform the operation. 933 * This avoids the differences in behavior between different compilers 934 * concerning shift values larger than the target data width. 935 */ 936 if (AccessBitWidth - ObjDesc->CommonField.StartFieldBitOffset < 937 ACPI_INTEGER_BIT_SIZE) 938 { 939 MergedDatum |= RawDatum << 940 (AccessBitWidth - ObjDesc->CommonField.StartFieldBitOffset); 941 } 942 943 if (i == DatumCount) 944 { 945 break; 946 } 947 948 /* Write merged datum to target buffer */ 949 950 memcpy (((char *) Buffer) + BufferOffset, &MergedDatum, 951 ACPI_MIN(ObjDesc->CommonField.AccessByteWidth, 952 BufferLength - BufferOffset)); 953 954 BufferOffset += ObjDesc->CommonField.AccessByteWidth; 955 MergedDatum = RawDatum >> ObjDesc->CommonField.StartFieldBitOffset; 956 } 957 958 /* Mask off any extra bits in the last datum */ 959 960 BufferTailBits = ObjDesc->CommonField.BitLength % AccessBitWidth; 961 if (BufferTailBits) 962 { 963 MergedDatum &= ACPI_MASK_BITS_ABOVE (BufferTailBits); 964 } 965 966 /* Write the last datum to the buffer */ 967 968 memcpy (((char *) Buffer) + BufferOffset, &MergedDatum, 969 ACPI_MIN(ObjDesc->CommonField.AccessByteWidth, 970 BufferLength - BufferOffset)); 971 972 return_ACPI_STATUS (AE_OK); 973 } 974 975 976 /******************************************************************************* 977 * 978 * FUNCTION: AcpiExInsertIntoField 979 * 980 * PARAMETERS: ObjDesc - Field to be written 981 * Buffer - Data to be written 982 * BufferLength - Length of Buffer 983 * 984 * RETURN: Status 985 * 986 * DESCRIPTION: Store the Buffer contents into the given field 987 * 988 ******************************************************************************/ 989 990 ACPI_STATUS 991 AcpiExInsertIntoField ( 992 ACPI_OPERAND_OBJECT *ObjDesc, 993 void *Buffer, 994 UINT32 BufferLength) 995 { 996 void *NewBuffer; 997 ACPI_STATUS Status; 998 UINT64 Mask; 999 UINT64 WidthMask; 1000 UINT64 MergedDatum; 1001 UINT64 RawDatum = 0; 1002 UINT32 FieldOffset = 0; 1003 UINT32 BufferOffset = 0; 1004 UINT32 BufferTailBits; 1005 UINT32 DatumCount; 1006 UINT32 FieldDatumCount; 1007 UINT32 AccessBitWidth; 1008 UINT32 RequiredLength; 1009 UINT32 i; 1010 1011 1012 ACPI_FUNCTION_TRACE (ExInsertIntoField); 1013 1014 1015 /* Validate input buffer */ 1016 1017 NewBuffer = NULL; 1018 RequiredLength = ACPI_ROUND_BITS_UP_TO_BYTES ( 1019 ObjDesc->CommonField.BitLength); 1020 1021 /* 1022 * We must have a buffer that is at least as long as the field 1023 * we are writing to. This is because individual fields are 1024 * indivisible and partial writes are not supported -- as per 1025 * the ACPI specification. 1026 */ 1027 if (BufferLength < RequiredLength) 1028 { 1029 /* We need to create a new buffer */ 1030 1031 NewBuffer = ACPI_ALLOCATE_ZEROED (RequiredLength); 1032 if (!NewBuffer) 1033 { 1034 return_ACPI_STATUS (AE_NO_MEMORY); 1035 } 1036 1037 /* 1038 * Copy the original data to the new buffer, starting 1039 * at Byte zero. All unused (upper) bytes of the 1040 * buffer will be 0. 1041 */ 1042 memcpy ((char *) NewBuffer, (char *) Buffer, BufferLength); 1043 Buffer = NewBuffer; 1044 BufferLength = RequiredLength; 1045 } 1046 1047 /* TBD: Move to common setup code */ 1048 1049 /* Algo is limited to sizeof(UINT64), so cut the AccessByteWidth */ 1050 if (ObjDesc->CommonField.AccessByteWidth > sizeof (UINT64)) 1051 { 1052 ObjDesc->CommonField.AccessByteWidth = sizeof (UINT64); 1053 } 1054 1055 AccessBitWidth = ACPI_MUL_8 (ObjDesc->CommonField.AccessByteWidth); 1056 1057 /* Create the bitmasks used for bit insertion */ 1058 1059 WidthMask = ACPI_MASK_BITS_ABOVE_64 (AccessBitWidth); 1060 Mask = WidthMask & 1061 ACPI_MASK_BITS_BELOW (ObjDesc->CommonField.StartFieldBitOffset); 1062 1063 /* Compute the number of datums (access width data items) */ 1064 1065 DatumCount = ACPI_ROUND_UP_TO (ObjDesc->CommonField.BitLength, 1066 AccessBitWidth); 1067 1068 FieldDatumCount = ACPI_ROUND_UP_TO (ObjDesc->CommonField.BitLength + 1069 ObjDesc->CommonField.StartFieldBitOffset, 1070 AccessBitWidth); 1071 1072 /* Get initial Datum from the input buffer */ 1073 1074 memcpy (&RawDatum, Buffer, 1075 ACPI_MIN(ObjDesc->CommonField.AccessByteWidth, 1076 BufferLength - BufferOffset)); 1077 1078 MergedDatum = RawDatum << ObjDesc->CommonField.StartFieldBitOffset; 1079 1080 /* Write the entire field */ 1081 1082 for (i = 1; i < FieldDatumCount; i++) 1083 { 1084 /* Write merged datum to the target field */ 1085 1086 MergedDatum &= Mask; 1087 Status = AcpiExWriteWithUpdateRule ( 1088 ObjDesc, Mask, MergedDatum, FieldOffset); 1089 if (ACPI_FAILURE (Status)) 1090 { 1091 goto Exit; 1092 } 1093 1094 FieldOffset += ObjDesc->CommonField.AccessByteWidth; 1095 1096 /* 1097 * Start new output datum by merging with previous input datum 1098 * if necessary. 1099 * 1100 * Note: Before the shift, check if the shift value will be larger than 1101 * the integer size. If so, there is no need to perform the operation. 1102 * This avoids the differences in behavior between different compilers 1103 * concerning shift values larger than the target data width. 1104 */ 1105 if ((AccessBitWidth - ObjDesc->CommonField.StartFieldBitOffset) < 1106 ACPI_INTEGER_BIT_SIZE) 1107 { 1108 MergedDatum = RawDatum >> 1109 (AccessBitWidth - ObjDesc->CommonField.StartFieldBitOffset); 1110 } 1111 else 1112 { 1113 MergedDatum = 0; 1114 } 1115 1116 Mask = WidthMask; 1117 1118 if (i == DatumCount) 1119 { 1120 break; 1121 } 1122 1123 /* Get the next input datum from the buffer */ 1124 1125 BufferOffset += ObjDesc->CommonField.AccessByteWidth; 1126 memcpy (&RawDatum, ((char *) Buffer) + BufferOffset, 1127 ACPI_MIN(ObjDesc->CommonField.AccessByteWidth, 1128 BufferLength - BufferOffset)); 1129 1130 MergedDatum |= RawDatum << ObjDesc->CommonField.StartFieldBitOffset; 1131 } 1132 1133 /* Mask off any extra bits in the last datum */ 1134 1135 BufferTailBits = (ObjDesc->CommonField.BitLength + 1136 ObjDesc->CommonField.StartFieldBitOffset) % AccessBitWidth; 1137 if (BufferTailBits) 1138 { 1139 Mask &= ACPI_MASK_BITS_ABOVE (BufferTailBits); 1140 } 1141 1142 /* Write the last datum to the field */ 1143 1144 MergedDatum &= Mask; 1145 Status = AcpiExWriteWithUpdateRule ( 1146 ObjDesc, Mask, MergedDatum, FieldOffset); 1147 1148 Exit: 1149 /* Free temporary buffer if we used one */ 1150 1151 if (NewBuffer) 1152 { 1153 ACPI_FREE (NewBuffer); 1154 } 1155 return_ACPI_STATUS (Status); 1156 } 1157