1/****************************************************************************** 2 * 3 * Module Name: exfldio - Aml Field I/O
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4 * $Revision: 104 $
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4 * $Revision: 106 $ |
5 * 6 *****************************************************************************/ 7 8/****************************************************************************** 9 * 10 * 1. Copyright Notice 11 * 12 * Some or all of this work - Copyright (c) 1999 - 2004, Intel Corp. 13 * All rights reserved. 14 * 15 * 2. License 16 * 17 * 2.1. This is your license from Intel Corp. under its intellectual property 18 * rights. You may have additional license terms from the party that provided 19 * you this software, covering your right to use that party's intellectual 20 * property rights. 21 * 22 * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a 23 * copy of the source code appearing in this file ("Covered Code") an 24 * irrevocable, perpetual, worldwide license under Intel's copyrights in the 25 * base code distributed originally by Intel ("Original Intel Code") to copy, 26 * make derivatives, distribute, use and display any portion of the Covered 27 * Code in any form, with the right to sublicense such rights; and 28 * 29 * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent 30 * license (with the right to sublicense), under only those claims of Intel 31 * patents that are infringed by the Original Intel Code, to make, use, sell, 32 * offer to sell, and import the Covered Code and derivative works thereof 33 * solely to the minimum extent necessary to exercise the above copyright 34 * license, and in no event shall the patent license extend to any additions 35 * to or modifications of the Original Intel Code. No other license or right 36 * is granted directly or by implication, estoppel or otherwise; 37 * 38 * The above copyright and patent license is granted only if the following 39 * conditions are met: 40 * 41 * 3. Conditions 42 * 43 * 3.1. Redistribution of Source with Rights to Further Distribute Source. 44 * Redistribution of source code of any substantial portion of the Covered 45 * Code or modification with rights to further distribute source must include 46 * the above Copyright Notice, the above License, this list of Conditions, 47 * and the following Disclaimer and Export Compliance provision. In addition, 48 * Licensee must cause all Covered Code to which Licensee contributes to 49 * contain a file documenting the changes Licensee made to create that Covered 50 * Code and the date of any change. Licensee must include in that file the 51 * documentation of any changes made by any predecessor Licensee. Licensee 52 * must include a prominent statement that the modification is derived, 53 * directly or indirectly, from Original Intel Code. 54 * 55 * 3.2. Redistribution of Source with no Rights to Further Distribute Source. 56 * Redistribution of source code of any substantial portion of the Covered 57 * Code or modification without rights to further distribute source must 58 * include the following Disclaimer and Export Compliance provision in the 59 * documentation and/or other materials provided with distribution. In 60 * addition, Licensee may not authorize further sublicense of source of any 61 * portion of the Covered Code, and must include terms to the effect that the 62 * license from Licensee to its licensee is limited to the intellectual 63 * property embodied in the software Licensee provides to its licensee, and 64 * not to intellectual property embodied in modifications its licensee may 65 * make. 66 * 67 * 3.3. Redistribution of Executable. Redistribution in executable form of any 68 * substantial portion of the Covered Code or modification must reproduce the 69 * above Copyright Notice, and the following Disclaimer and Export Compliance 70 * provision in the documentation and/or other materials provided with the 71 * distribution. 72 * 73 * 3.4. Intel retains all right, title, and interest in and to the Original 74 * Intel Code. 75 * 76 * 3.5. Neither the name Intel nor any other trademark owned or controlled by 77 * Intel shall be used in advertising or otherwise to promote the sale, use or 78 * other dealings in products derived from or relating to the Covered Code 79 * without prior written authorization from Intel. 80 * 81 * 4. Disclaimer and Export Compliance 82 * 83 * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED 84 * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE 85 * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE, 86 * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY 87 * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY 88 * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A 89 * PARTICULAR PURPOSE. 90 * 91 * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES 92 * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR 93 * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT, 94 * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY 95 * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL 96 * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS 97 * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY 98 * LIMITED REMEDY. 99 * 100 * 4.3. Licensee shall not export, either directly or indirectly, any of this 101 * software or system incorporating such software without first obtaining any 102 * required license or other approval from the U. S. Department of Commerce or 103 * any other agency or department of the United States Government. In the 104 * event Licensee exports any such software from the United States or 105 * re-exports any such software from a foreign destination, Licensee shall 106 * ensure that the distribution and export/re-export of the software is in 107 * compliance with all laws, regulations, orders, or other restrictions of the 108 * U.S. Export Administration Regulations. Licensee agrees that neither it nor 109 * any of its subsidiaries will export/re-export any technical data, process, 110 * software, or service, directly or indirectly, to any country for which the 111 * United States government or any agency thereof requires an export license, 112 * other governmental approval, or letter of assurance, without first obtaining 113 * such license, approval or letter. 114 * 115 *****************************************************************************/ 116 117 118#define __EXFLDIO_C__ 119 120#include "acpi.h" 121#include "acinterp.h" 122#include "amlcode.h" 123#include "acevents.h" 124#include "acdispat.h" 125 126 127#define _COMPONENT ACPI_EXECUTER 128 ACPI_MODULE_NAME ("exfldio") 129 130 131/******************************************************************************* 132 * 133 * FUNCTION: AcpiExSetupRegion 134 * 135 * PARAMETERS: *ObjDesc - Field to be read or written 136 * FieldDatumByteOffset - Byte offset of this datum within the 137 * parent field 138 * 139 * RETURN: Status 140 * 141 * DESCRIPTION: Common processing for AcpiExExtractFromField and 142 * AcpiExInsertIntoField. Initialize the Region if necessary and 143 * validate the request. 144 * 145 ******************************************************************************/ 146 147ACPI_STATUS 148AcpiExSetupRegion ( 149 ACPI_OPERAND_OBJECT *ObjDesc, 150 UINT32 FieldDatumByteOffset) 151{ 152 ACPI_STATUS Status = AE_OK; 153 ACPI_OPERAND_OBJECT *RgnDesc; 154 155 156 ACPI_FUNCTION_TRACE_U32 ("ExSetupRegion", FieldDatumByteOffset); 157 158 159 RgnDesc = ObjDesc->CommonField.RegionObj; 160 161 /* We must have a valid region */ 162 163 if (ACPI_GET_OBJECT_TYPE (RgnDesc) != ACPI_TYPE_REGION) 164 { 165 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Needed Region, found type %X (%s)\n", 166 ACPI_GET_OBJECT_TYPE (RgnDesc), 167 AcpiUtGetObjectTypeName (RgnDesc))); 168 169 return_ACPI_STATUS (AE_AML_OPERAND_TYPE); 170 } 171 172 /* 173 * If the Region Address and Length have not been previously evaluated, 174 * evaluate them now and save the results. 175 */ 176 if (!(RgnDesc->Common.Flags & AOPOBJ_DATA_VALID)) 177 { 178 Status = AcpiDsGetRegionArguments (RgnDesc); 179 if (ACPI_FAILURE (Status)) 180 { 181 return_ACPI_STATUS (Status); 182 } 183 } 184 185 if (RgnDesc->Region.SpaceId == ACPI_ADR_SPACE_SMBUS) 186 { 187 /* SMBus has a non-linear address space */ 188 189 return_ACPI_STATUS (AE_OK); 190 } 191 192#ifdef ACPI_UNDER_DEVELOPMENT 193 /* 194 * If the Field access is AnyAcc, we can now compute the optimal 195 * access (because we know know the length of the parent region) 196 */ 197 if (!(ObjDesc->Common.Flags & AOPOBJ_DATA_VALID)) 198 { 199 if (ACPI_FAILURE (Status)) 200 { 201 return_ACPI_STATUS (Status); 202 } 203 } 204#endif 205 206 /* 207 * Validate the request. The entire request from the byte offset for a 208 * length of one field datum (access width) must fit within the region. 209 * (Region length is specified in bytes) 210 */ 211 if (RgnDesc->Region.Length < (ObjDesc->CommonField.BaseByteOffset 212 + FieldDatumByteOffset 213 + ObjDesc->CommonField.AccessByteWidth)) 214 { 215 if (RgnDesc->Region.Length < ObjDesc->CommonField.AccessByteWidth) 216 { 217 /* 218 * This is the case where the AccessType (AccWord, etc.) is wider 219 * than the region itself. For example, a region of length one 220 * byte, and a field with Dword access specified. 221 */ 222 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, 223 "Field [%4.4s] access width (%d bytes) too large for region [%4.4s] (length %X)\n", 224 AcpiUtGetNodeName (ObjDesc->CommonField.Node), 225 ObjDesc->CommonField.AccessByteWidth, 226 AcpiUtGetNodeName (RgnDesc->Region.Node), RgnDesc->Region.Length)); 227 } 228 229 /* 230 * Offset rounded up to next multiple of field width 231 * exceeds region length, indicate an error 232 */ 233 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, 234 "Field [%4.4s] Base+Offset+Width %X+%X+%X is beyond end of region [%4.4s] (length %X)\n", 235 AcpiUtGetNodeName (ObjDesc->CommonField.Node), 236 ObjDesc->CommonField.BaseByteOffset, 237 FieldDatumByteOffset, ObjDesc->CommonField.AccessByteWidth, 238 AcpiUtGetNodeName (RgnDesc->Region.Node), RgnDesc->Region.Length)); 239 240 return_ACPI_STATUS (AE_AML_REGION_LIMIT); 241 } 242 243 return_ACPI_STATUS (AE_OK); 244} 245 246 247/******************************************************************************* 248 * 249 * FUNCTION: AcpiExAccessRegion 250 * 251 * PARAMETERS: *ObjDesc - Field to be read 252 * FieldDatumByteOffset - Byte offset of this datum within the 253 * parent field 254 * *Value - Where to store value (must at least 255 * the size of ACPI_INTEGER) 256 * Function - Read or Write flag plus other region- 257 * dependent flags 258 * 259 * RETURN: Status 260 * 261 * DESCRIPTION: Read or Write a single field datum to an Operation Region. 262 * 263 ******************************************************************************/ 264 265ACPI_STATUS 266AcpiExAccessRegion ( 267 ACPI_OPERAND_OBJECT *ObjDesc, 268 UINT32 FieldDatumByteOffset, 269 ACPI_INTEGER *Value, 270 UINT32 Function) 271{ 272 ACPI_STATUS Status; 273 ACPI_OPERAND_OBJECT *RgnDesc; 274 ACPI_PHYSICAL_ADDRESS Address; 275 276 277 ACPI_FUNCTION_TRACE ("ExAccessRegion"); 278 279 280 /* 281 * Ensure that the region operands are fully evaluated and verify 282 * the validity of the request 283 */ 284 Status = AcpiExSetupRegion (ObjDesc, FieldDatumByteOffset); 285 if (ACPI_FAILURE (Status)) 286 { 287 return_ACPI_STATUS (Status); 288 } 289 290 /* 291 * The physical address of this field datum is: 292 * 293 * 1) The base of the region, plus 294 * 2) The base offset of the field, plus 295 * 3) The current offset into the field 296 */ 297 RgnDesc = ObjDesc->CommonField.RegionObj; 298 Address = RgnDesc->Region.Address 299 + ObjDesc->CommonField.BaseByteOffset 300 + FieldDatumByteOffset; 301 302 if ((Function & ACPI_IO_MASK) == ACPI_READ) 303 { 304 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD, "[READ]")); 305 } 306 else 307 { 308 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD, "[WRITE]")); 309 } 310 311 ACPI_DEBUG_PRINT_RAW ((ACPI_DB_BFIELD, 312 " Region [%s:%X], Width %X, ByteBase %X, Offset %X at %8.8X%8.8X\n", 313 AcpiUtGetRegionName (RgnDesc->Region.SpaceId), 314 RgnDesc->Region.SpaceId, 315 ObjDesc->CommonField.AccessByteWidth, 316 ObjDesc->CommonField.BaseByteOffset, 317 FieldDatumByteOffset, 318 ACPI_FORMAT_UINT64 (Address))); 319 320 /* Invoke the appropriate AddressSpace/OpRegion handler */ 321 322 Status = AcpiEvAddressSpaceDispatch (RgnDesc, Function, 323 Address, ACPI_MUL_8 (ObjDesc->CommonField.AccessByteWidth), Value); 324 325 if (ACPI_FAILURE (Status)) 326 { 327 if (Status == AE_NOT_IMPLEMENTED) 328 { 329 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, 330 "Region %s(%X) not implemented\n", 331 AcpiUtGetRegionName (RgnDesc->Region.SpaceId), 332 RgnDesc->Region.SpaceId)); 333 } 334 else if (Status == AE_NOT_EXIST) 335 { 336 ACPI_REPORT_ERROR (( 337 "Region %s(%X) has no handler\n", 338 AcpiUtGetRegionName (RgnDesc->Region.SpaceId), 339 RgnDesc->Region.SpaceId)); 340 } 341 } 342 343 return_ACPI_STATUS (Status); 344} 345 346 347/******************************************************************************* 348 * 349 * FUNCTION: AcpiExRegisterOverflow 350 * 351 * PARAMETERS: *ObjDesc - Register(Field) to be written 352 * Value - Value to be stored 353 * 354 * RETURN: TRUE if value overflows the field, FALSE otherwise 355 * 356 * DESCRIPTION: Check if a value is out of range of the field being written. 357 * Used to check if the values written to Index and Bank registers 358 * are out of range. Normally, the value is simply truncated 359 * to fit the field, but this case is most likely a serious 360 * coding error in the ASL. 361 * 362 ******************************************************************************/ 363 364BOOLEAN 365AcpiExRegisterOverflow ( 366 ACPI_OPERAND_OBJECT *ObjDesc, 367 ACPI_INTEGER Value) 368{ 369 370 if (ObjDesc->CommonField.BitLength >= ACPI_INTEGER_BIT_SIZE) 371 { 372 /* 373 * The field is large enough to hold the maximum integer, so we can 374 * never overflow it. 375 */ 376 return (FALSE); 377 } 378 379 if (Value >= ((ACPI_INTEGER) 1 << ObjDesc->CommonField.BitLength)) 380 { 381 /* 382 * The Value is larger than the maximum value that can fit into 383 * the register. 384 */ 385 return (TRUE); 386 } 387 388 /* The Value will fit into the field with no truncation */ 389 390 return (FALSE); 391} 392 393 394/******************************************************************************* 395 * 396 * FUNCTION: AcpiExFieldDatumIo 397 * 398 * PARAMETERS: *ObjDesc - Field to be read 399 * FieldDatumByteOffset - Byte offset of this datum within the 400 * parent field 401 * *Value - Where to store value (must be 64 bits) 402 * ReadWrite - Read or Write flag 403 * 404 * RETURN: Status 405 * 406 * DESCRIPTION: Read or Write a single datum of a field. The FieldType is 407 * demultiplexed here to handle the different types of fields 408 * (BufferField, RegionField, IndexField, BankField) 409 * 410 ******************************************************************************/ 411 412ACPI_STATUS 413AcpiExFieldDatumIo ( 414 ACPI_OPERAND_OBJECT *ObjDesc, 415 UINT32 FieldDatumByteOffset, 416 ACPI_INTEGER *Value, 417 UINT32 ReadWrite) 418{ 419 ACPI_STATUS Status; 420 ACPI_INTEGER LocalValue; 421 422 423 ACPI_FUNCTION_TRACE_U32 ("ExFieldDatumIo", FieldDatumByteOffset); 424 425 426 if (ReadWrite == ACPI_READ) 427 { 428 if (!Value) 429 { 430 LocalValue = 0; 431 Value = &LocalValue; /* To support reads without saving return value */ 432 } 433 434 /* Clear the entire return buffer first, [Very Important!] */ 435 436 *Value = 0; 437 } 438 439 /* 440 * The four types of fields are: 441 * 442 * BufferField - Read/write from/to a Buffer 443 * RegionField - Read/write from/to a Operation Region. 444 * BankField - Write to a Bank Register, then read/write from/to an OpRegion 445 * IndexField - Write to an Index Register, then read/write from/to a Data Register 446 */ 447 switch (ACPI_GET_OBJECT_TYPE (ObjDesc)) 448 { 449 case ACPI_TYPE_BUFFER_FIELD: 450 /* 451 * If the BufferField arguments have not been previously evaluated, 452 * evaluate them now and save the results. 453 */ 454 if (!(ObjDesc->Common.Flags & AOPOBJ_DATA_VALID)) 455 { 456 Status = AcpiDsGetBufferFieldArguments (ObjDesc); 457 if (ACPI_FAILURE (Status)) 458 { 459 return_ACPI_STATUS (Status); 460 } 461 } 462 463 if (ReadWrite == ACPI_READ) 464 { 465 /* 466 * Copy the data from the source buffer. 467 * Length is the field width in bytes. 468 */ 469 ACPI_MEMCPY (Value, (ObjDesc->BufferField.BufferObj)->Buffer.Pointer 470 + ObjDesc->BufferField.BaseByteOffset 471 + FieldDatumByteOffset, 472 ObjDesc->CommonField.AccessByteWidth); 473 } 474 else 475 { 476 /* 477 * Copy the data to the target buffer. 478 * Length is the field width in bytes. 479 */ 480 ACPI_MEMCPY ((ObjDesc->BufferField.BufferObj)->Buffer.Pointer 481 + ObjDesc->BufferField.BaseByteOffset 482 + FieldDatumByteOffset, 483 Value, ObjDesc->CommonField.AccessByteWidth); 484 } 485 486 Status = AE_OK; 487 break; 488 489 490 case ACPI_TYPE_LOCAL_BANK_FIELD: 491 492 /* Ensure that the BankValue is not beyond the capacity of the register */ 493 494 if (AcpiExRegisterOverflow (ObjDesc->BankField.BankObj, 495 (ACPI_INTEGER) ObjDesc->BankField.Value)) 496 { 497 return_ACPI_STATUS (AE_AML_REGISTER_LIMIT); 498 } 499 500 /* 501 * For BankFields, we must write the BankValue to the BankRegister 502 * (itself a RegionField) before we can access the data. 503 */ 504 Status = AcpiExInsertIntoField (ObjDesc->BankField.BankObj, 505 &ObjDesc->BankField.Value, 506 sizeof (ObjDesc->BankField.Value)); 507 if (ACPI_FAILURE (Status)) 508 { 509 return_ACPI_STATUS (Status); 510 } 511 512 /* 513 * Now that the Bank has been selected, fall through to the 514 * RegionField case and write the datum to the Operation Region 515 */ 516 517 /*lint -fallthrough */ 518 519 520 case ACPI_TYPE_LOCAL_REGION_FIELD: 521 /* 522 * For simple RegionFields, we just directly access the owning 523 * Operation Region. 524 */ 525 Status = AcpiExAccessRegion (ObjDesc, FieldDatumByteOffset, Value, 526 ReadWrite); 527 break; 528 529 530 case ACPI_TYPE_LOCAL_INDEX_FIELD: 531 532 533 /* Ensure that the IndexValue is not beyond the capacity of the register */ 534 535 if (AcpiExRegisterOverflow (ObjDesc->IndexField.IndexObj, 536 (ACPI_INTEGER) ObjDesc->IndexField.Value)) 537 { 538 return_ACPI_STATUS (AE_AML_REGISTER_LIMIT); 539 } 540 541 /* Write the index value to the IndexRegister (itself a RegionField) */ 542 543 FieldDatumByteOffset += ObjDesc->IndexField.Value; 544 545 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD, 546 "Write to Index Register: Value %8.8X\n", 547 FieldDatumByteOffset)); 548 549 Status = AcpiExInsertIntoField (ObjDesc->IndexField.IndexObj, 550 &FieldDatumByteOffset, 551 sizeof (FieldDatumByteOffset)); 552 if (ACPI_FAILURE (Status)) 553 { 554 return_ACPI_STATUS (Status); 555 } 556 557 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD, 558 "I/O to Data Register: ValuePtr %p\n", 559 Value)); 560 561 if (ReadWrite == ACPI_READ) 562 { 563 /* Read the datum from the DataRegister */ 564 565 Status = AcpiExExtractFromField (ObjDesc->IndexField.DataObj, 566 Value, sizeof (ACPI_INTEGER)); 567 } 568 else 569 { 570 /* Write the datum to the DataRegister */ 571 572 Status = AcpiExInsertIntoField (ObjDesc->IndexField.DataObj, 573 Value, sizeof (ACPI_INTEGER)); 574 } 575 break; 576 577 578 default: 579 580 ACPI_REPORT_ERROR (("Wrong object type in field I/O %X\n", 581 ACPI_GET_OBJECT_TYPE (ObjDesc))); 582 Status = AE_AML_INTERNAL; 583 break; 584 } 585 586 if (ACPI_SUCCESS (Status)) 587 { 588 if (ReadWrite == ACPI_READ) 589 { 590 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD, "Value Read %8.8X%8.8X, Width %d\n", 591 ACPI_FORMAT_UINT64 (*Value), 592 ObjDesc->CommonField.AccessByteWidth)); 593 } 594 else 595 { 596 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD, "Value Written %8.8X%8.8X, Width %d\n", 597 ACPI_FORMAT_UINT64 (*Value), 598 ObjDesc->CommonField.AccessByteWidth)); 599 } 600 } 601 602 return_ACPI_STATUS (Status); 603} 604 605 606/******************************************************************************* 607 * 608 * FUNCTION: AcpiExWriteWithUpdateRule 609 * 610 * PARAMETERS: *ObjDesc - Field to be set 611 * Value - Value to store 612 * 613 * RETURN: Status 614 * 615 * DESCRIPTION: Apply the field update rule to a field write 616 * 617 ******************************************************************************/ 618 619ACPI_STATUS 620AcpiExWriteWithUpdateRule ( 621 ACPI_OPERAND_OBJECT *ObjDesc, 622 ACPI_INTEGER Mask, 623 ACPI_INTEGER FieldValue, 624 UINT32 FieldDatumByteOffset) 625{ 626 ACPI_STATUS Status = AE_OK; 627 ACPI_INTEGER MergedValue; 628 ACPI_INTEGER CurrentValue; 629 630 631 ACPI_FUNCTION_TRACE_U32 ("ExWriteWithUpdateRule", Mask); 632 633 634 /* Start with the new bits */ 635 636 MergedValue = FieldValue; 637 638 /* If the mask is all ones, we don't need to worry about the update rule */ 639 640 if (Mask != ACPI_INTEGER_MAX) 641 { 642 /* Decode the update rule */ 643 644 switch (ObjDesc->CommonField.FieldFlags & AML_FIELD_UPDATE_RULE_MASK) 645 { 646 case AML_FIELD_UPDATE_PRESERVE: 647 /* 648 * Check if update rule needs to be applied (not if mask is all 649 * ones) The left shift drops the bits we want to ignore. 650 */ 651 if ((~Mask << (ACPI_MUL_8 (sizeof (Mask)) - 652 ACPI_MUL_8 (ObjDesc->CommonField.AccessByteWidth))) != 0) 653 { 654 /* 655 * Read the current contents of the byte/word/dword containing 656 * the field, and merge with the new field value. 657 */ 658 Status = AcpiExFieldDatumIo (ObjDesc, FieldDatumByteOffset, 659 &CurrentValue, ACPI_READ); 660 if (ACPI_FAILURE (Status)) 661 { 662 return_ACPI_STATUS (Status); 663 } 664 665 MergedValue |= (CurrentValue & ~Mask); 666 } 667 break; 668 669 case AML_FIELD_UPDATE_WRITE_AS_ONES: 670 671 /* Set positions outside the field to all ones */ 672 673 MergedValue |= ~Mask; 674 break; 675 676 case AML_FIELD_UPDATE_WRITE_AS_ZEROS: 677 678 /* Set positions outside the field to all zeros */ 679 680 MergedValue &= Mask; 681 break; 682 683 default: 684 685 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, 686 "WriteWithUpdateRule: Unknown UpdateRule setting: %X\n", 687 (ObjDesc->CommonField.FieldFlags & AML_FIELD_UPDATE_RULE_MASK))); 688 return_ACPI_STATUS (AE_AML_OPERAND_VALUE); 689 } 690 } 691 692 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD, 693 "Mask %8.8X%8.8X, DatumOffset %X, Width %X, Value %8.8X%8.8X, MergedValue %8.8X%8.8X\n", 694 ACPI_FORMAT_UINT64 (Mask), 695 FieldDatumByteOffset, 696 ObjDesc->CommonField.AccessByteWidth, 697 ACPI_FORMAT_UINT64 (FieldValue), 698 ACPI_FORMAT_UINT64 (MergedValue))); 699 700 /* Write the merged value */ 701 702 Status = AcpiExFieldDatumIo (ObjDesc, FieldDatumByteOffset, 703 &MergedValue, ACPI_WRITE); 704 705 return_ACPI_STATUS (Status); 706} 707 708 709/******************************************************************************* 710 * 711 * FUNCTION: AcpiExGetBufferDatum 712 * 713 * PARAMETERS: Datum - Where the Datum is returned 714 * Buffer - Raw field buffer 715 * BufferLength - Entire length (used for big-endian only) 716 * ByteGranularity - 1/2/4/8 Granularity of the field 717 * (aka Datum Size) 718 * BufferOffset - Datum offset into the buffer 719 * 720 * RETURN: none 721 * 722 * DESCRIPTION: Get a datum from the buffer according to the buffer field 723 * byte granularity 724 * 725 ******************************************************************************/ 726 727void 728AcpiExGetBufferDatum ( 729 ACPI_INTEGER *Datum, 730 void *Buffer, 731 UINT32 BufferLength, 732 UINT32 ByteGranularity, 733 UINT32 BufferOffset) 734{ 735 UINT32 Index; 736 737 738 ACPI_FUNCTION_TRACE_U32 ("ExGetBufferDatum", ByteGranularity); 739 740 741 /* Get proper index into buffer (handles big/little endian) */ 742 743 Index = ACPI_BUFFER_INDEX (BufferLength, BufferOffset, ByteGranularity); 744 745 /* Move the requested number of bytes */ 746 747 switch (ByteGranularity) 748 { 749 case ACPI_FIELD_BYTE_GRANULARITY: 750 751 *Datum = ((UINT8 *) Buffer) [Index]; 752 break; 753 754 case ACPI_FIELD_WORD_GRANULARITY: 755 756 ACPI_MOVE_16_TO_64 (Datum, &(((UINT16 *) Buffer) [Index])); 757 break; 758 759 case ACPI_FIELD_DWORD_GRANULARITY: 760 761 ACPI_MOVE_32_TO_64 (Datum, &(((UINT32 *) Buffer) [Index])); 762 break; 763 764 case ACPI_FIELD_QWORD_GRANULARITY: 765 766 ACPI_MOVE_64_TO_64 (Datum, &(((UINT64 *) Buffer) [Index])); 767 break; 768 769 default: 770 /* Should not get here */ 771 break; 772 } 773 774 return_VOID; 775} 776 777 778/******************************************************************************* 779 * 780 * FUNCTION: AcpiExSetBufferDatum 781 * 782 * PARAMETERS: MergedDatum - Value to store 783 * Buffer - Receiving buffer 784 * BufferLength - Entire length (used for big-endian only) 785 * ByteGranularity - 1/2/4/8 Granularity of the field 786 * (aka Datum Size) 787 * BufferOffset - Datum offset into the buffer 788 * 789 * RETURN: none 790 * 791 * DESCRIPTION: Store the merged datum to the buffer according to the 792 * byte granularity 793 * 794 ******************************************************************************/ 795 796void 797AcpiExSetBufferDatum ( 798 ACPI_INTEGER MergedDatum, 799 void *Buffer, 800 UINT32 BufferLength, 801 UINT32 ByteGranularity, 802 UINT32 BufferOffset) 803{ 804 UINT32 Index; 805 806 807 ACPI_FUNCTION_TRACE_U32 ("ExSetBufferDatum", ByteGranularity); 808 809 810 /* Get proper index into buffer (handles big/little endian) */ 811 812 Index = ACPI_BUFFER_INDEX (BufferLength, BufferOffset, ByteGranularity); 813 814 /* Move the requested number of bytes */ 815 816 switch (ByteGranularity) 817 { 818 case ACPI_FIELD_BYTE_GRANULARITY: 819 820 ((UINT8 *) Buffer) [Index] = (UINT8) MergedDatum; 821 break; 822 823 case ACPI_FIELD_WORD_GRANULARITY: 824 825 ACPI_MOVE_64_TO_16 (&(((UINT16 *) Buffer)[Index]), &MergedDatum); 826 break; 827 828 case ACPI_FIELD_DWORD_GRANULARITY: 829 830 ACPI_MOVE_64_TO_32 (&(((UINT32 *) Buffer)[Index]), &MergedDatum); 831 break; 832 833 case ACPI_FIELD_QWORD_GRANULARITY: 834 835 ACPI_MOVE_64_TO_64 (&(((UINT64 *) Buffer)[Index]), &MergedDatum); 836 break; 837 838 default: 839 /* Should not get here */ 840 break; 841 } 842 843 return_VOID; 844} 845 846 847/******************************************************************************* 848 *
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849 * FUNCTION: AcpiExCommonBufferSetup 850 * 851 * PARAMETERS: ObjDesc - Field object 852 * BufferLength - Length of caller's buffer 853 * DatumCount - Where the DatumCount is returned 854 * 855 * RETURN: Status, DatumCount 856 * 857 * DESCRIPTION: Common code to validate the incoming buffer size and compute 858 * the number of field "datums" that must be read or written. 859 * A "datum" is the smallest unit that can be read or written 860 * to the field, it is either 1,2,4, or 8 bytes. 861 * 862 ******************************************************************************/ 863 864ACPI_STATUS 865AcpiExCommonBufferSetup ( 866 ACPI_OPERAND_OBJECT *ObjDesc, 867 UINT32 BufferLength, 868 UINT32 *DatumCount) 869{ 870 UINT32 ByteFieldLength; 871 UINT32 ActualByteFieldLength; 872 873 874 ACPI_FUNCTION_TRACE ("ExCommonBufferSetup"); 875 876 877 /* 878 * Incoming buffer must be at least as long as the field, we do not 879 * allow "partial" field reads/writes. We do not care if the buffer is 880 * larger than the field, this typically happens when an integer is 881 * read/written to a field that is actually smaller than an integer. 882 */ 883 ByteFieldLength = ACPI_ROUND_BITS_UP_TO_BYTES ( 884 ObjDesc->CommonField.BitLength); 885 if (ByteFieldLength > BufferLength) 886 { 887 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD, 888 "Field size %X (bytes) is too large for buffer (%X)\n", 889 ByteFieldLength, BufferLength)); 890 891 return_ACPI_STATUS (AE_BUFFER_OVERFLOW); 892 } 893 894 /* 895 * Create "actual" field byte count (minimum number of bytes that 896 * must be read), then convert to datum count (minimum number 897 * of datum-sized units that must be read) 898 */ 899 ActualByteFieldLength = ACPI_ROUND_BITS_UP_TO_BYTES ( 900 ObjDesc->CommonField.StartFieldBitOffset + 901 ObjDesc->CommonField.BitLength); 902 903 904 *DatumCount = ACPI_ROUND_UP_TO (ActualByteFieldLength, 905 ObjDesc->CommonField.AccessByteWidth); 906 907 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD, 908 "BufferBytes %X, ActualBytes %X, Datums %X, ByteGran %X\n", 909 ByteFieldLength, ActualByteFieldLength, 910 *DatumCount, ObjDesc->CommonField.AccessByteWidth)); 911 912 return_ACPI_STATUS (AE_OK); 913} 914 915 916/******************************************************************************* 917 * |
918 * FUNCTION: AcpiExExtractFromField 919 *
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851 * PARAMETERS: *ObjDesc - Field to be read
852 * *Value - Where to store value
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920 * PARAMETERS: ObjDesc - Field to be read 921 * Buffer - Where to store the field data 922 * BufferLength - Length of Buffer |
923 * 924 * RETURN: Status 925 *
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856 * DESCRIPTION: Retrieve the value of the given field
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926 * DESCRIPTION: Retrieve the current value of the given field |
927 * 928 ******************************************************************************/ 929 930ACPI_STATUS 931AcpiExExtractFromField ( 932 ACPI_OPERAND_OBJECT *ObjDesc, 933 void *Buffer, 934 UINT32 BufferLength) 935{ 936 ACPI_STATUS Status; 937 UINT32 FieldDatumByteOffset; 938 UINT32 BufferDatumOffset; 939 ACPI_INTEGER PreviousRawDatum = 0; 940 ACPI_INTEGER ThisRawDatum = 0; 941 ACPI_INTEGER MergedDatum = 0;
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872 UINT32 ByteFieldLength;
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942 UINT32 DatumCount; 943 UINT32 i; 944 945 946 ACPI_FUNCTION_TRACE ("ExExtractFromField"); 947 948
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880 /*
881 * The field must fit within the caller's buffer
882 */
883 ByteFieldLength = ACPI_ROUND_BITS_UP_TO_BYTES (ObjDesc->CommonField.BitLength);
884 if (ByteFieldLength > BufferLength)
885 {
886 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
887 "Field size %X (bytes) too large for buffer (%X)\n",
888 ByteFieldLength, BufferLength));
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949 /* Validate buffer, compute number of datums */ |
950
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890 return_ACPI_STATUS (AE_BUFFER_OVERFLOW);
891 }
892
893 /* Convert field byte count to datum count, round up if necessary */
894
895 DatumCount = ACPI_ROUND_UP_TO (ByteFieldLength,
896 ObjDesc->CommonField.AccessByteWidth);
897
898 /*
899 * If the field is not aligned on a datum boundary and does not
900 * fit within a single datum, we must read an extra datum.
901 *
902 * We could just split the aligned and non-aligned cases since the
903 * aligned case is so very simple, but this would require more code.
904 */
905 if ((ObjDesc->CommonField.EndFieldValidBits != 0) &&
906 (!(ObjDesc->CommonField.Flags & AOPOBJ_SINGLE_DATUM)))
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951 Status = AcpiExCommonBufferSetup (ObjDesc, BufferLength, &DatumCount); 952 if (ACPI_FAILURE (Status)) |
953 {
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908 DatumCount++;
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954 return_ACPI_STATUS (Status); |
955 } 956
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911 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
912 "ByteLen %X, DatumLen %X, ByteGran %X\n",
913 ByteFieldLength, DatumCount,ObjDesc->CommonField.AccessByteWidth));
914
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957 /* 958 * Clear the caller's buffer (the whole buffer length as given) 959 * This is very important, especially in the cases where the buffer 960 * is longer than the size of the field. 961 */ 962 ACPI_MEMSET (Buffer, 0, BufferLength); 963 964 FieldDatumByteOffset = 0; 965 BufferDatumOffset= 0; 966 967 /* Read the entire field */ 968 969 for (i = 0; i < DatumCount; i++) 970 { 971 Status = AcpiExFieldDatumIo (ObjDesc, FieldDatumByteOffset, 972 &ThisRawDatum, ACPI_READ); 973 if (ACPI_FAILURE (Status)) 974 { 975 return_ACPI_STATUS (Status); 976 } 977 978 /* We might actually be done if the request fits in one datum */ 979 980 if ((DatumCount == 1) && 981 (ObjDesc->CommonField.Flags & AOPOBJ_SINGLE_DATUM)) 982 { 983 /* 1) Shift the valid data bits down to start at bit 0 */ 984 985 MergedDatum = (ThisRawDatum >> ObjDesc->CommonField.StartFieldBitOffset); 986 987 /* 2) Mask off any upper unused bits (bits not part of the field) */ 988 989 if (ObjDesc->CommonField.EndBufferValidBits) 990 { 991 MergedDatum &= ACPI_MASK_BITS_ABOVE (ObjDesc->CommonField.EndBufferValidBits); 992 } 993 994 /* Store the datum to the caller buffer */ 995 996 AcpiExSetBufferDatum (MergedDatum, Buffer, BufferLength, 997 ObjDesc->CommonField.AccessByteWidth, BufferDatumOffset); 998 999 return_ACPI_STATUS (AE_OK); 1000 } 1001 1002 /* Special handling for the last datum to ignore extra bits */ 1003 1004 if ((i >= (DatumCount -1)) && 1005 (ObjDesc->CommonField.EndFieldValidBits)) 1006 { 1007 /* 1008 * This is the last iteration of the loop. We need to clear 1009 * any unused bits (bits that are not part of this field) before 1010 * we store the final merged datum into the caller buffer. 1011 */ 1012 ThisRawDatum &= 1013 ACPI_MASK_BITS_ABOVE (ObjDesc->CommonField.EndFieldValidBits); 1014 } 1015 1016 /* 1017 * Create the (possibly) merged datum to be stored to the caller buffer 1018 */ 1019 if (ObjDesc->CommonField.StartFieldBitOffset == 0) 1020 { 1021 /* Field is not skewed and we can just copy the datum */ 1022 1023 AcpiExSetBufferDatum (ThisRawDatum, Buffer, BufferLength, 1024 ObjDesc->CommonField.AccessByteWidth, BufferDatumOffset); 1025 BufferDatumOffset++; 1026 } 1027 else 1028 { 1029 /* Not aligned -- on the first iteration, just save the datum */ 1030 1031 if (i != 0) 1032 { 1033 /* 1034 * Put together the appropriate bits of the two raw data to make a 1035 * single complete field datum 1036 * 1037 * 1) Normalize the first datum down to bit 0 1038 */ 1039 MergedDatum = (PreviousRawDatum >> ObjDesc->CommonField.StartFieldBitOffset); 1040 1041 /* 2) Insert the second datum "above" the first datum */ 1042 1043 MergedDatum |= (ThisRawDatum << ObjDesc->CommonField.DatumValidBits); 1044 1045 AcpiExSetBufferDatum (MergedDatum, Buffer, BufferLength, 1046 ObjDesc->CommonField.AccessByteWidth, BufferDatumOffset); 1047 BufferDatumOffset++; 1048 } 1049 1050 /* 1051 * Save the raw datum that was just acquired since it may contain bits 1052 * of the *next* field datum 1053 */ 1054 PreviousRawDatum = ThisRawDatum; 1055 } 1056 1057 FieldDatumByteOffset += ObjDesc->CommonField.AccessByteWidth; 1058 } 1059 1060 /* For non-aligned case, there is one last datum to insert */ 1061 1062 if (ObjDesc->CommonField.StartFieldBitOffset != 0) 1063 { 1064 MergedDatum = (ThisRawDatum >> ObjDesc->CommonField.StartFieldBitOffset); 1065 1066 AcpiExSetBufferDatum (MergedDatum, Buffer, BufferLength, 1067 ObjDesc->CommonField.AccessByteWidth, BufferDatumOffset); 1068 } 1069 1070 return_ACPI_STATUS (AE_OK); 1071} 1072 1073 1074/******************************************************************************* 1075 * 1076 * FUNCTION: AcpiExInsertIntoField 1077 *
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1036 * PARAMETERS: *ObjDesc - Field to be set
1037 * Buffer - Value to store
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1078 * PARAMETERS: ObjDesc - Field to be written 1079 * Buffer - Data to be written 1080 * BufferLength - Length of Buffer |
1081 * 1082 * RETURN: Status 1083 *
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1041 * DESCRIPTION: Store the value into the given field
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1084 * DESCRIPTION: Store the Buffer contents into the given field |
1085 * 1086 ******************************************************************************/ 1087 1088ACPI_STATUS 1089AcpiExInsertIntoField ( 1090 ACPI_OPERAND_OBJECT *ObjDesc, 1091 void *Buffer, 1092 UINT32 BufferLength) 1093{ 1094 ACPI_STATUS Status; 1095 UINT32 FieldDatumByteOffset; 1096 UINT32 DatumOffset; 1097 ACPI_INTEGER Mask; 1098 ACPI_INTEGER MergedDatum; 1099 ACPI_INTEGER PreviousRawDatum; 1100 ACPI_INTEGER ThisRawDatum;
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1058 UINT32 ByteFieldLength;
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1101 UINT32 DatumCount; 1102 1103 1104 ACPI_FUNCTION_TRACE ("ExInsertIntoField"); 1105 1106
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1065 /*
1066 * Incoming buffer must be at least as long as the field, we do not
1067 * allow "partial" field writes. We do not care if the buffer is
1068 * larger than the field, this typically happens when an integer is
1069 * written to a field that is actually smaller than an integer.
1070 */
1071 ByteFieldLength = ACPI_ROUND_BITS_UP_TO_BYTES (
1072 ObjDesc->CommonField.BitLength);
1073 if (BufferLength < ByteFieldLength)
1074 {
1075 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
1076 "Buffer length %X too small for field %X\n",
1077 BufferLength, ByteFieldLength));
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1107 /* Validate buffer, compute number of datums */ |
1108
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1079 return_ACPI_STATUS (AE_BUFFER_OVERFLOW);
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1109 Status = AcpiExCommonBufferSetup (ObjDesc, BufferLength, &DatumCount); 1110 if (ACPI_FAILURE (Status)) 1111 { 1112 return_ACPI_STATUS (Status); |
1113 } 1114
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1082 ByteFieldLength = ACPI_ROUND_BITS_UP_TO_BYTES (
1083 ObjDesc->CommonField.StartFieldBitOffset +
1084 ObjDesc->CommonField.BitLength);
1085
1086 /* Convert byte count to datum count, round up if necessary */
1087
1088 DatumCount = ACPI_ROUND_UP_TO (ByteFieldLength,
1089 ObjDesc->CommonField.AccessByteWidth);
1090
1091 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
1092 "Bytes %X, Datums %X, ByteGran %X\n",
1093 ByteFieldLength, DatumCount, ObjDesc->CommonField.AccessByteWidth));
1094
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1115 /* 1116 * Break the request into up to three parts (similar to an I/O request): 1117 * 1) non-aligned part at start 1118 * 2) aligned part in middle 1119 * 3) non-aligned part at the end 1120 */ 1121 FieldDatumByteOffset = 0; 1122 DatumOffset= 0; 1123 1124 /* Get a single datum from the caller's buffer */ 1125 1126 AcpiExGetBufferDatum (&PreviousRawDatum, Buffer, BufferLength, 1127 ObjDesc->CommonField.AccessByteWidth, DatumOffset); 1128 1129 /* 1130 * Part1: 1131 * Write a partial field datum if field does not begin on a datum boundary 1132 * Note: The code in this section also handles the aligned case 1133 * 1134 * Construct Mask with 1 bits where the field is, 0 bits elsewhere 1135 * (Only the bottom 5 bits of BitLength are valid for a shift operation) 1136 * 1137 * Mask off bits that are "below" the field (if any) 1138 */ 1139 Mask = ACPI_MASK_BITS_BELOW (ObjDesc->CommonField.StartFieldBitOffset); 1140 1141 /* If the field fits in one datum, may need to mask upper bits */ 1142 1143 if ((ObjDesc->CommonField.Flags & AOPOBJ_SINGLE_DATUM) && 1144 ObjDesc->CommonField.EndFieldValidBits) 1145 { 1146 /* There are bits above the field, mask them off also */ 1147 1148 Mask &= ACPI_MASK_BITS_ABOVE (ObjDesc->CommonField.EndFieldValidBits); 1149 } 1150 1151 /* Shift and mask the value into the field position */ 1152 1153 MergedDatum = (PreviousRawDatum << ObjDesc->CommonField.StartFieldBitOffset); 1154 MergedDatum &= Mask; 1155 1156 /* Apply the update rule (if necessary) and write the datum to the field */ 1157 1158 Status = AcpiExWriteWithUpdateRule (ObjDesc, Mask, MergedDatum, 1159 FieldDatumByteOffset); 1160 if (ACPI_FAILURE (Status)) 1161 { 1162 return_ACPI_STATUS (Status); 1163 } 1164 1165 /* We just wrote the first datum */ 1166 1167 DatumOffset++; 1168 1169 /* If the entire field fits within one datum, we are done. */ 1170 1171 if ((DatumCount == 1) && 1172 (ObjDesc->CommonField.Flags & AOPOBJ_SINGLE_DATUM)) 1173 { 1174 return_ACPI_STATUS (AE_OK); 1175 } 1176 1177 /* 1178 * Part2: 1179 * Write the aligned data. 1180 * 1181 * We don't need to worry about the update rule for these data, because 1182 * all of the bits in each datum are part of the field. 1183 * 1184 * The last datum must be special cased because it might contain bits 1185 * that are not part of the field -- therefore the "update rule" must be 1186 * applied in Part3 below. 1187 */ 1188 while (DatumOffset < DatumCount) 1189 { 1190 FieldDatumByteOffset += ObjDesc->CommonField.AccessByteWidth; 1191 1192 /* 1193 * Get the next raw buffer datum. It may contain bits of the previous 1194 * field datum 1195 */ 1196 AcpiExGetBufferDatum (&ThisRawDatum, Buffer, BufferLength, 1197 ObjDesc->CommonField.AccessByteWidth, DatumOffset); 1198 1199 /* Create the field datum based on the field alignment */ 1200 1201 if (ObjDesc->CommonField.StartFieldBitOffset != 0) 1202 { 1203 /* 1204 * Put together appropriate bits of the two raw buffer data to make 1205 * a single complete field datum 1206 */ 1207 MergedDatum = 1208 (PreviousRawDatum >> ObjDesc->CommonField.DatumValidBits) | 1209 (ThisRawDatum << ObjDesc->CommonField.StartFieldBitOffset); 1210 } 1211 else 1212 { 1213 /* Field began aligned on datum boundary */ 1214 1215 MergedDatum = ThisRawDatum; 1216 } 1217 1218 /* 1219 * Special handling for the last datum if the field does NOT end on 1220 * a datum boundary. Update Rule must be applied to the bits outside 1221 * the field. 1222 */ 1223 DatumOffset++; 1224 if ((DatumOffset == DatumCount) && 1225 (ObjDesc->CommonField.EndFieldValidBits)) 1226 { 1227 /* 1228 * If there are dangling non-aligned bits, perform one more merged write 1229 * Else - field is aligned at the end, no need for any more writes 1230 */ 1231 1232 /* 1233 * Part3: 1234 * This is the last datum and the field does not end on a datum boundary. 1235 * Build the partial datum and write with the update rule. 1236 * 1237 * Mask off the unused bits above (after) the end-of-field 1238 */ 1239 Mask = ACPI_MASK_BITS_ABOVE (ObjDesc->CommonField.EndFieldValidBits); 1240 MergedDatum &= Mask; 1241 1242 /* Write the last datum with the update rule */ 1243 1244 Status = AcpiExWriteWithUpdateRule (ObjDesc, Mask, MergedDatum, 1245 FieldDatumByteOffset); 1246 if (ACPI_FAILURE (Status)) 1247 { 1248 return_ACPI_STATUS (Status); 1249 } 1250 } 1251 else 1252 { 1253 /* Normal (aligned) case -- write the completed datum */ 1254 1255 Status = AcpiExFieldDatumIo (ObjDesc, FieldDatumByteOffset, 1256 &MergedDatum, ACPI_WRITE); 1257 if (ACPI_FAILURE (Status)) 1258 { 1259 return_ACPI_STATUS (Status); 1260 } 1261 } 1262 1263 /* 1264 * Save the most recent datum since it may contain bits of the *next* 1265 * field datum. Update current byte offset. 1266 */ 1267 PreviousRawDatum = ThisRawDatum; 1268 } 1269 1270 return_ACPI_STATUS (Status); 1271} 1272 1273
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