exfldio.c revision 77424
1/****************************************************************************** 2 * 3 * Module Name: exfldio - Aml Field I/O 4 * $Revision: 57 $ 5 * 6 *****************************************************************************/ 7 8/****************************************************************************** 9 * 10 * 1. Copyright Notice 11 * 12 * Some or all of this work - Copyright (c) 1999, 2000, 2001, 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 "acnamesp.h" 124#include "achware.h" 125#include "acevents.h" 126#include "acdispat.h" 127 128 129#define _COMPONENT ACPI_EXECUTER 130 MODULE_NAME ("exfldio") 131 132 133/******************************************************************************* 134 * 135 * FUNCTION: AcpiExSetupField 136 * 137 * PARAMETERS: *ObjDesc - Field to be read or written 138 * FieldDatumByteOffset - Current offset into the field 139 * 140 * RETURN: Status 141 * 142 * DESCRIPTION: Common processing for AcpiExExtractFromField and 143 * AcpiExInsertIntoField 144 * 145 ******************************************************************************/ 146 147ACPI_STATUS 148AcpiExSetupField ( 149 ACPI_OPERAND_OBJECT *ObjDesc, 150 UINT32 FieldDatumByteOffset) 151{ 152 ACPI_STATUS Status = AE_OK; 153 ACPI_OPERAND_OBJECT *RgnDesc; 154 155 156 FUNCTION_TRACE ("ExSetupField"); 157 158 159 /* Parameter validation */ 160 161 RgnDesc = ObjDesc->CommonField.RegionObj; 162 if (!ObjDesc || !RgnDesc) 163 { 164 DEBUG_PRINTP (ACPI_ERROR, ("Internal error - null handle\n")); 165 return_ACPI_STATUS (AE_AML_NO_OPERAND); 166 } 167 168 if (ACPI_TYPE_REGION != RgnDesc->Common.Type) 169 { 170 DEBUG_PRINTP (ACPI_ERROR, ("Needed Region, found type %x %s\n", 171 RgnDesc->Common.Type, AcpiUtGetTypeName (RgnDesc->Common.Type))); 172 return_ACPI_STATUS (AE_AML_OPERAND_TYPE); 173 } 174 175 176 /* 177 * If the Region Address and Length have not been previously evaluated, 178 * evaluate them now and save the results. 179 */ 180 if (!(RgnDesc->Region.Flags & AOPOBJ_DATA_VALID)) 181 { 182 183 Status = AcpiDsGetRegionArguments (RgnDesc); 184 if (ACPI_FAILURE (Status)) 185 { 186 return_ACPI_STATUS (Status); 187 } 188 } 189 190 191 /* 192 * Validate the request. The entire request from the byte offset for a 193 * length of one field datum (access width) must fit within the region. 194 * (Region length is specified in bytes) 195 */ 196 if (RgnDesc->Region.Length < (ObjDesc->CommonField.BaseByteOffset + 197 FieldDatumByteOffset + 198 ObjDesc->CommonField.AccessByteWidth)) 199 { 200 if (RgnDesc->Region.Length < ObjDesc->CommonField.AccessByteWidth) 201 { 202 /* 203 * This is the case where the AccessType (AccWord, etc.) is wider 204 * than the region itself. For example, a region of length one 205 * byte, and a field with Dword access specified. 206 */ 207 DEBUG_PRINTP (ACPI_ERROR, 208 ("Field access width (%d bytes) too large for region size (%X)\n", 209 ObjDesc->CommonField.AccessByteWidth, RgnDesc->Region.Length)); 210 } 211 212 /* 213 * Offset rounded up to next multiple of field width 214 * exceeds region length, indicate an error 215 */ 216 DEBUG_PRINTP (ACPI_ERROR, 217 ("Field base+offset+width %X+%X+%X exceeds region size (%X bytes) field=%p region=%p\n", 218 ObjDesc->CommonField.BaseByteOffset, FieldDatumByteOffset, 219 ObjDesc->CommonField.AccessByteWidth, 220 RgnDesc->Region.Length, ObjDesc, RgnDesc)); 221 222 return_ACPI_STATUS (AE_AML_REGION_LIMIT); 223 } 224 225 return_ACPI_STATUS (AE_OK); 226} 227 228 229/******************************************************************************* 230 * 231 * FUNCTION: AcpiExReadFieldDatum 232 * 233 * PARAMETERS: *ObjDesc - Field to be read 234 * *Value - Where to store value (must be 32 bits) 235 * 236 * RETURN: Status 237 * 238 * DESCRIPTION: Retrieve the value of the given field 239 * 240 ******************************************************************************/ 241 242ACPI_STATUS 243AcpiExReadFieldDatum ( 244 ACPI_OPERAND_OBJECT *ObjDesc, 245 UINT32 FieldDatumByteOffset, 246 UINT32 *Value) 247{ 248 ACPI_STATUS Status; 249 ACPI_OPERAND_OBJECT *RgnDesc; 250 ACPI_PHYSICAL_ADDRESS Address; 251 UINT32 LocalValue; 252 253 254 FUNCTION_TRACE_U32 ("ExReadFieldDatum", FieldDatumByteOffset); 255 256 257 if (!Value) 258 { 259 LocalValue = 0; 260 Value = &LocalValue; /* support reads without saving value */ 261 } 262 263 /* Clear the entire return buffer first, [Very Important!] */ 264 265 *Value = 0; 266 267 268 /* 269 * BufferFields - Read from a Buffer 270 * Other Fields - Read from a Operation Region. 271 */ 272 switch (ObjDesc->Common.Type) 273 { 274 case ACPI_TYPE_BUFFER_FIELD: 275 276 /* 277 * For BufferFields, we only need to copy the data from the 278 * source buffer. Length is the field width in bytes. 279 */ 280 MEMCPY (Value, (ObjDesc->BufferField.BufferObj)->Buffer.Pointer 281 + ObjDesc->BufferField.BaseByteOffset + FieldDatumByteOffset, 282 ObjDesc->CommonField.AccessByteWidth); 283 Status = AE_OK; 284 break; 285 286 287 case INTERNAL_TYPE_REGION_FIELD: 288 case INTERNAL_TYPE_BANK_FIELD: 289 290 /* 291 * For other fields, we need to go through an Operation Region 292 * (Only types that will get here are RegionFields and BankFields) 293 */ 294 Status = AcpiExSetupField (ObjDesc, FieldDatumByteOffset); 295 if (ACPI_FAILURE (Status)) 296 { 297 return_ACPI_STATUS (Status); 298 } 299 300 301 /* 302 * The physical address of this field datum is: 303 * 304 * 1) The base of the region, plus 305 * 2) The base offset of the field, plus 306 * 3) The current offset into the field 307 */ 308 RgnDesc = ObjDesc->CommonField.RegionObj; 309 Address = RgnDesc->Region.Address + ObjDesc->CommonField.BaseByteOffset + 310 FieldDatumByteOffset; 311 312 DEBUG_PRINTP (TRACE_BFIELD, ("Region %s(%X) width %X base:off %X:%X at %08lX\n", 313 AcpiUtGetRegionName (RgnDesc->Region.SpaceId), 314 RgnDesc->Region.SpaceId, ObjDesc->CommonField.AccessBitWidth, 315 ObjDesc->CommonField.BaseByteOffset, FieldDatumByteOffset, 316 Address)); 317 318 319 /* Invoke the appropriate AddressSpace/OpRegion handler */ 320 321 Status = AcpiEvAddressSpaceDispatch (RgnDesc, ACPI_READ_ADR_SPACE, 322 Address, ObjDesc->CommonField.AccessBitWidth, Value); 323 if (Status == AE_NOT_IMPLEMENTED) 324 { 325 DEBUG_PRINTP (ACPI_ERROR, ("Region %s(%X) not implemented\n", 326 AcpiUtGetRegionName (RgnDesc->Region.SpaceId), 327 RgnDesc->Region.SpaceId)); 328 } 329 330 else if (Status == AE_NOT_EXIST) 331 { 332 DEBUG_PRINTP (ACPI_ERROR, ("Region %s(%X) has no handler\n", 333 AcpiUtGetRegionName (RgnDesc->Region.SpaceId), 334 RgnDesc->Region.SpaceId)); 335 } 336 break; 337 338 339 default: 340 341 DEBUG_PRINTP (ACPI_ERROR, ("%p, wrong source type - %s\n", 342 ObjDesc, AcpiUtGetTypeName (ObjDesc->Common.Type))); 343 Status = AE_AML_INTERNAL; 344 break; 345 } 346 347 348 DEBUG_PRINTP (TRACE_BFIELD, ("Returned value=%08lX \n", *Value)); 349 350 return_ACPI_STATUS (Status); 351} 352 353 354/******************************************************************************* 355 * 356 * FUNCTION: AcpiExGetBufferDatum 357 * 358 * PARAMETERS: MergedDatum - Value to store 359 * Buffer - Receiving buffer 360 * ByteGranularity - 1/2/4 Granularity of the field 361 * (aka Datum Size) 362 * Offset - Datum offset into the buffer 363 * 364 * RETURN: none 365 * 366 * DESCRIPTION: Store the merged datum to the buffer according to the 367 * byte granularity 368 * 369 ******************************************************************************/ 370 371static void 372AcpiExGetBufferDatum( 373 UINT32 *Datum, 374 void *Buffer, 375 UINT32 ByteGranularity, 376 UINT32 Offset) 377{ 378 379 switch (ByteGranularity) 380 { 381 case ACPI_FIELD_BYTE_GRANULARITY: 382 *Datum = ((UINT8 *) Buffer) [Offset]; 383 break; 384 385 case ACPI_FIELD_WORD_GRANULARITY: 386 MOVE_UNALIGNED16_TO_32 (Datum, &(((UINT16 *) Buffer) [Offset])); 387 break; 388 389 case ACPI_FIELD_DWORD_GRANULARITY: 390 MOVE_UNALIGNED32_TO_32 (Datum, &(((UINT32 *) Buffer) [Offset])); 391 break; 392 } 393} 394 395 396/******************************************************************************* 397 * 398 * FUNCTION: AcpiExSetBufferDatum 399 * 400 * PARAMETERS: MergedDatum - Value to store 401 * Buffer - Receiving buffer 402 * ByteGranularity - 1/2/4 Granularity of the field 403 * (aka Datum Size) 404 * Offset - Datum offset into the buffer 405 * 406 * RETURN: none 407 * 408 * DESCRIPTION: Store the merged datum to the buffer according to the 409 * byte granularity 410 * 411 ******************************************************************************/ 412 413static void 414AcpiExSetBufferDatum ( 415 UINT32 MergedDatum, 416 void *Buffer, 417 UINT32 ByteGranularity, 418 UINT32 Offset) 419{ 420 421 switch (ByteGranularity) 422 { 423 case ACPI_FIELD_BYTE_GRANULARITY: 424 ((UINT8 *) Buffer) [Offset] = (UINT8) MergedDatum; 425 break; 426 427 case ACPI_FIELD_WORD_GRANULARITY: 428 MOVE_UNALIGNED16_TO_16 (&(((UINT16 *) Buffer)[Offset]), &MergedDatum); 429 break; 430 431 case ACPI_FIELD_DWORD_GRANULARITY: 432 MOVE_UNALIGNED32_TO_32 (&(((UINT32 *) Buffer)[Offset]), &MergedDatum); 433 break; 434 } 435} 436 437 438/******************************************************************************* 439 * 440 * FUNCTION: AcpiExExtractFromField 441 * 442 * PARAMETERS: *ObjDesc - Field to be read 443 * *Value - Where to store value 444 * 445 * RETURN: Status 446 * 447 * DESCRIPTION: Retrieve the value of the given field 448 * 449 ******************************************************************************/ 450 451ACPI_STATUS 452AcpiExExtractFromField ( 453 ACPI_OPERAND_OBJECT *ObjDesc, 454 void *Buffer, 455 UINT32 BufferLength) 456{ 457 ACPI_STATUS Status; 458 UINT32 FieldDatumByteOffset; 459 UINT32 DatumOffset; 460 UINT32 PreviousRawDatum; 461 UINT32 ThisRawDatum = 0; 462 UINT32 MergedDatum = 0; 463 UINT32 ByteFieldLength; 464 UINT32 DatumCount; 465 466 467 FUNCTION_TRACE ("ExExtractFromField"); 468 469 470 /* 471 * The field must fit within the caller's buffer 472 */ 473 ByteFieldLength = ROUND_BITS_UP_TO_BYTES (ObjDesc->CommonField.BitLength); 474 if (ByteFieldLength > BufferLength) 475 { 476 DEBUG_PRINTP (ACPI_INFO, ("Field size %X (bytes) too large for buffer (%X)\n", 477 ByteFieldLength, BufferLength)); 478 479 return_ACPI_STATUS (AE_BUFFER_OVERFLOW); 480 } 481 482 /* Convert field byte count to datum count, round up if necessary */ 483 484 DatumCount = ROUND_UP_TO (ByteFieldLength, ObjDesc->CommonField.AccessByteWidth); 485 486 DEBUG_PRINT (ACPI_INFO, 487 ("ByteLen=%x, DatumLen=%x, BitGran=%x, ByteGran=%x\n", 488 ByteFieldLength, DatumCount, ObjDesc->CommonField.AccessBitWidth, 489 ObjDesc->CommonField.AccessByteWidth)); 490 491 492 /* 493 * Clear the caller's buffer (the whole buffer length as given) 494 * This is very important, especially in the cases where a byte is read, 495 * but the buffer is really a UINT32 (4 bytes). 496 */ 497 MEMSET (Buffer, 0, BufferLength); 498 499 /* Read the first raw datum to prime the loop */ 500 501 FieldDatumByteOffset = 0; 502 DatumOffset= 0; 503 504 Status = AcpiExReadFieldDatum (ObjDesc, FieldDatumByteOffset, &PreviousRawDatum); 505 if (ACPI_FAILURE (Status)) 506 { 507 return_ACPI_STATUS (Status); 508 } 509 510 511 /* We might actually be done if the request fits in one datum */ 512 513 if ((DatumCount == 1) && 514 (ObjDesc->CommonField.AccessFlags & AFIELD_SINGLE_DATUM)) 515 { 516 /* 1) Shift the valid data bits down to start at bit 0 */ 517 518 MergedDatum = (PreviousRawDatum >> ObjDesc->CommonField.StartFieldBitOffset); 519 520 /* 2) Mask off any upper unused bits (bits not part of the field) */ 521 522 if (ObjDesc->CommonField.EndBufferValidBits) 523 { 524 MergedDatum &= MASK_BITS_ABOVE (ObjDesc->CommonField.EndBufferValidBits); 525 } 526 527 /* Store the datum to the caller buffer */ 528 529 AcpiExSetBufferDatum (MergedDatum, Buffer, ObjDesc->CommonField.AccessByteWidth, 530 DatumOffset); 531 532 return_ACPI_STATUS (AE_OK); 533 } 534 535 536 /* We need to get more raw data to complete one or more field data */ 537 538 while (DatumOffset < DatumCount) 539 { 540 FieldDatumByteOffset += ObjDesc->CommonField.AccessByteWidth; 541 542 /* 543 * If the field is aligned on a byte boundary, we don't want 544 * to perform a final read, since this would potentially read 545 * past the end of the region. 546 * 547 * TBD: [Investigate] It may make more sense to just split the aligned 548 * and non-aligned cases since the aligned case is so very simple, 549 */ 550 if ((ObjDesc->CommonField.StartFieldBitOffset != 0) || 551 ((ObjDesc->CommonField.StartFieldBitOffset == 0) && 552 (DatumOffset < (DatumCount -1)))) 553 { 554 /* 555 * Get the next raw datum, it contains some or all bits 556 * of the current field datum 557 */ 558 Status = AcpiExReadFieldDatum (ObjDesc, FieldDatumByteOffset, &ThisRawDatum); 559 if (ACPI_FAILURE (Status)) 560 { 561 return_ACPI_STATUS (Status); 562 } 563 } 564 565 /* 566 * Create the (possibly) merged datum to be stored to the caller buffer 567 */ 568 if (ObjDesc->CommonField.StartFieldBitOffset == 0) 569 { 570 /* Field is not skewed and we can just copy the datum */ 571 572 MergedDatum = PreviousRawDatum; 573 } 574 575 else 576 { 577 /* 578 * Put together the appropriate bits of the two raw data to make a 579 * single complete field datum 580 * 581 * 1) Normalize the first datum down to bit 0 582 */ 583 MergedDatum = (PreviousRawDatum >> ObjDesc->CommonField.StartFieldBitOffset); 584 585 /* 2) Insert the second datum "above" the first datum */ 586 587 MergedDatum |= (ThisRawDatum << ObjDesc->CommonField.DatumValidBits); 588 589 if ((DatumOffset >= (DatumCount -1))) 590 { 591 /* 592 * This is the last iteration of the loop. We need to clear 593 * any unused bits (bits that are not part of this field) that 594 * came from the last raw datum before we store the final 595 * merged datum into the caller buffer. 596 */ 597 if (ObjDesc->CommonField.EndBufferValidBits) 598 { 599 MergedDatum &= 600 MASK_BITS_ABOVE (ObjDesc->CommonField.EndBufferValidBits); 601 } 602 } 603 } 604 605 606 /* 607 * Store the merged field datum in the caller's buffer, according to 608 * the granularity of the field (size of each datum). 609 */ 610 AcpiExSetBufferDatum (MergedDatum, Buffer, ObjDesc->CommonField.AccessByteWidth, 611 DatumOffset); 612 613 /* 614 * Save the raw datum that was just acquired since it may contain bits 615 * of the *next* field datum. Update offsets 616 */ 617 PreviousRawDatum = ThisRawDatum; 618 DatumOffset++; 619 } 620 621 622 return_ACPI_STATUS (AE_OK); 623} 624 625 626/******************************************************************************* 627 * 628 * FUNCTION: AcpiExWriteFieldDatum 629 * 630 * PARAMETERS: *ObjDesc - Field to be set 631 * Value - Value to store 632 * 633 * RETURN: Status 634 * 635 * DESCRIPTION: Store the value into the given field 636 * 637 ******************************************************************************/ 638 639static ACPI_STATUS 640AcpiExWriteFieldDatum ( 641 ACPI_OPERAND_OBJECT *ObjDesc, 642 UINT32 FieldDatumByteOffset, 643 UINT32 Value) 644{ 645 ACPI_STATUS Status = AE_OK; 646 ACPI_OPERAND_OBJECT *RgnDesc = NULL; 647 ACPI_PHYSICAL_ADDRESS Address; 648 649 650 FUNCTION_TRACE_U32 ("ExWriteFieldDatum", FieldDatumByteOffset); 651 652 653 654 /* 655 * BufferFields - Read from a Buffer 656 * Other Fields - Read from a Operation Region. 657 */ 658 switch (ObjDesc->Common.Type) 659 { 660 case ACPI_TYPE_BUFFER_FIELD: 661 662 /* 663 * For BufferFields, we only need to copy the data to the 664 * target buffer. Length is the field width in bytes. 665 */ 666 MEMCPY ((ObjDesc->BufferField.BufferObj)->Buffer.Pointer 667 + ObjDesc->BufferField.BaseByteOffset + FieldDatumByteOffset, 668 &Value, ObjDesc->CommonField.AccessByteWidth); 669 Status = AE_OK; 670 break; 671 672 673 case INTERNAL_TYPE_REGION_FIELD: 674 case INTERNAL_TYPE_BANK_FIELD: 675 676 /* 677 * For other fields, we need to go through an Operation Region 678 * (Only types that will get here are RegionFields and BankFields) 679 */ 680 Status = AcpiExSetupField (ObjDesc, FieldDatumByteOffset); 681 if (ACPI_FAILURE (Status)) 682 { 683 return_ACPI_STATUS (Status); 684 } 685 686 /* 687 * The physical address of this field datum is: 688 * 689 * 1) The base of the region, plus 690 * 2) The base offset of the field, plus 691 * 3) The current offset into the field 692 */ 693 RgnDesc = ObjDesc->CommonField.RegionObj; 694 Address = RgnDesc->Region.Address + 695 ObjDesc->CommonField.BaseByteOffset + 696 FieldDatumByteOffset; 697 698 DEBUG_PRINTP (TRACE_BFIELD, 699 ("Store %X in Region %s(%X) at %p width %X\n", 700 Value, AcpiUtGetRegionName (RgnDesc->Region.SpaceId), 701 RgnDesc->Region.SpaceId, Address, ObjDesc->CommonField.AccessBitWidth)); 702 703 /* Invoke the appropriate AddressSpace/OpRegion handler */ 704 705 Status = AcpiEvAddressSpaceDispatch (RgnDesc, ACPI_WRITE_ADR_SPACE, 706 Address, ObjDesc->CommonField.AccessBitWidth, &Value); 707 708 if (Status == AE_NOT_IMPLEMENTED) 709 { 710 DEBUG_PRINTP (ACPI_ERROR, 711 ("**** Region type %s(%X) not implemented\n", 712 AcpiUtGetRegionName (RgnDesc->Region.SpaceId), 713 RgnDesc->Region.SpaceId)); 714 } 715 716 else if (Status == AE_NOT_EXIST) 717 { 718 DEBUG_PRINTP (ACPI_ERROR, 719 ("**** Region type %s(%X) does not have a handler\n", 720 AcpiUtGetRegionName (RgnDesc->Region.SpaceId), 721 RgnDesc->Region.SpaceId)); 722 } 723 724 break; 725 726 727 default: 728 729 DEBUG_PRINTP (ACPI_ERROR, ("%p, wrong source type - %s\n", 730 ObjDesc, AcpiUtGetTypeName (ObjDesc->Common.Type))); 731 Status = AE_AML_INTERNAL; 732 break; 733 } 734 735 736 DEBUG_PRINTP (TRACE_BFIELD, ("Value written=%08lX \n", Value)); 737 return_ACPI_STATUS (Status); 738} 739 740 741/******************************************************************************* 742 * 743 * FUNCTION: AcpiExWriteFieldDatumWithUpdateRule 744 * 745 * PARAMETERS: *ObjDesc - Field to be set 746 * Value - Value to store 747 * 748 * RETURN: Status 749 * 750 * DESCRIPTION: Apply the field update rule to a field write 751 * 752 ******************************************************************************/ 753 754static ACPI_STATUS 755AcpiExWriteFieldDatumWithUpdateRule ( 756 ACPI_OPERAND_OBJECT *ObjDesc, 757 UINT32 Mask, 758 UINT32 FieldValue, 759 UINT32 FieldDatumByteOffset) 760{ 761 ACPI_STATUS Status = AE_OK; 762 UINT32 MergedValue; 763 UINT32 CurrentValue; 764 765 766 FUNCTION_TRACE ("ExWriteFieldDatumWithUpdateRule"); 767 768 769 /* Start with the new bits */ 770 771 MergedValue = FieldValue; 772 773 774 /* If the mask is all ones, we don't need to worry about the update rule */ 775 776 if (Mask != ACPI_UINT32_MAX) 777 { 778 /* Decode the update rule */ 779 780 switch (ObjDesc->CommonField.UpdateRule) 781 { 782 783 case UPDATE_PRESERVE: 784 785 /* 786 * Check if update rule needs to be applied (not if mask is all 787 * ones) The left shift drops the bits we want to ignore. 788 */ 789 if ((~Mask << (sizeof (Mask) * 8 - 790 ObjDesc->CommonField.AccessBitWidth)) != 0) 791 { 792 /* 793 * Read the current contents of the byte/word/dword containing 794 * the field, and merge with the new field value. 795 */ 796 Status = AcpiExReadFieldDatum (ObjDesc, FieldDatumByteOffset, 797 &CurrentValue); 798 MergedValue |= (CurrentValue & ~Mask); 799 } 800 break; 801 802 803 case UPDATE_WRITE_AS_ONES: 804 805 /* Set positions outside the field to all ones */ 806 807 MergedValue |= ~Mask; 808 break; 809 810 811 case UPDATE_WRITE_AS_ZEROS: 812 813 /* Set positions outside the field to all zeros */ 814 815 MergedValue &= Mask; 816 break; 817 818 819 default: 820 DEBUG_PRINT (ACPI_ERROR, 821 ("WriteWithUpdateRule: Unknown UpdateRule setting: %x\n", 822 ObjDesc->CommonField.UpdateRule)); 823 return_ACPI_STATUS (AE_AML_OPERAND_VALUE); 824 break; 825 } 826 } 827 828 829 /* Write the merged value */ 830 831 Status = AcpiExWriteFieldDatum (ObjDesc, FieldDatumByteOffset, 832 MergedValue); 833 834 DEBUG_PRINTP (TRACE_BFIELD, ("Mask %X DatumOffset %X Value %X, MergedValue %X\n", 835 Mask, FieldDatumByteOffset, FieldValue, MergedValue)); 836 837 return_ACPI_STATUS (Status); 838} 839 840 841/******************************************************************************* 842 * 843 * FUNCTION: AcpiExInsertIntoField 844 * 845 * PARAMETERS: *ObjDesc - Field to be set 846 * Buffer - Value to store 847 * 848 * RETURN: Status 849 * 850 * DESCRIPTION: Store the value into the given field 851 * 852 ******************************************************************************/ 853 854ACPI_STATUS 855AcpiExInsertIntoField ( 856 ACPI_OPERAND_OBJECT *ObjDesc, 857 void *Buffer, 858 UINT32 BufferLength) 859{ 860 ACPI_STATUS Status; 861 UINT32 FieldDatumByteOffset; 862 UINT32 DatumOffset; 863 UINT32 Mask; 864 UINT32 MergedDatum; 865 UINT32 PreviousRawDatum; 866 UINT32 ThisRawDatum; 867 UINT32 ByteFieldLength; 868 UINT32 DatumCount; 869 870 871 FUNCTION_TRACE ("ExInsertIntoField"); 872 873 874 /* 875 * Incoming buffer must be at least as long as the field, we do not 876 * allow "partial" field writes. We do not care if the buffer is 877 * larger than the field, this typically happens when an integer is 878 * written to a field that is actually smaller than an integer. 879 */ 880 ByteFieldLength = ROUND_BITS_UP_TO_BYTES (ObjDesc->CommonField.BitLength); 881 if (BufferLength < ByteFieldLength) 882 { 883 DEBUG_PRINTP (ACPI_INFO, ("Buffer length %X too small for field %X\n", 884 BufferLength, ByteFieldLength)); 885 886 /* TBD: Need a better error code */ 887 888 return_ACPI_STATUS (AE_BUFFER_OVERFLOW); 889 } 890 891 /* Convert byte count to datum count, round up if necessary */ 892 893 DatumCount = ROUND_UP_TO (ByteFieldLength, ObjDesc->CommonField.AccessByteWidth); 894 895 DEBUG_PRINT (ACPI_INFO, 896 ("ByteLen=%x, DatumLen=%x, BitGran=%x, ByteGran=%x\n", 897 ByteFieldLength, DatumCount, ObjDesc->CommonField.AccessBitWidth, 898 ObjDesc->CommonField.AccessByteWidth)); 899 900 901 /* 902 * Break the request into up to three parts (similar to an I/O request): 903 * 1) non-aligned part at start 904 * 2) aligned part in middle 905 * 3) non-aligned part at the end 906 */ 907 FieldDatumByteOffset = 0; 908 DatumOffset= 0; 909 910 /* Get a single datum from the caller's buffer */ 911 912 AcpiExGetBufferDatum (&PreviousRawDatum, Buffer, 913 ObjDesc->CommonField.AccessByteWidth, DatumOffset); 914 915 /* 916 * Part1: 917 * Write a partial field datum if field does not begin on a datum boundary 918 * Note: The code in this section also handles the aligned case 919 * 920 * Construct Mask with 1 bits where the field is, 0 bits elsewhere 921 * (Only the bottom 5 bits of BitLength are valid for a shift operation) 922 * 923 * Mask off bits that are "below" the field (if any) 924 */ 925 Mask = MASK_BITS_BELOW (ObjDesc->CommonField.StartFieldBitOffset); 926 927 /* If the field fits in one datum, may need to mask upper bits */ 928 929 if ((ObjDesc->CommonField.AccessFlags & AFIELD_SINGLE_DATUM) && 930 ObjDesc->CommonField.EndFieldValidBits) 931 { 932 /* There are bits above the field, mask them off also */ 933 934 Mask &= MASK_BITS_ABOVE (ObjDesc->CommonField.EndFieldValidBits); 935 } 936 937 /* Shift and mask the value into the field position */ 938 939 MergedDatum = (PreviousRawDatum << ObjDesc->CommonField.StartFieldBitOffset); 940 MergedDatum &= Mask; 941 942 /* Apply the update rule (if necessary) and write the datum to the field */ 943 944 Status = AcpiExWriteFieldDatumWithUpdateRule (ObjDesc, Mask, MergedDatum, 945 FieldDatumByteOffset); 946 if (ACPI_FAILURE (Status)) 947 { 948 return_ACPI_STATUS (Status); 949 } 950 951 /* If the entire field fits within one datum, we are done. */ 952 953 if ((DatumCount == 1) && 954 (ObjDesc->CommonField.AccessFlags & AFIELD_SINGLE_DATUM)) 955 { 956 return_ACPI_STATUS (AE_OK); 957 } 958 959 /* 960 * Part2: 961 * Write the aligned data. 962 * 963 * We don't need to worry about the update rule for these data, because 964 * all of the bits in each datum are part of the field. 965 * 966 * The last datum must be special cased because it might contain bits 967 * that are not part of the field -- therefore the "update rule" must be 968 * applied in Part3 below. 969 */ 970 while (DatumOffset < DatumCount) 971 { 972 DatumOffset++; 973 FieldDatumByteOffset += ObjDesc->CommonField.AccessByteWidth; 974 975 /* 976 * Get the next raw buffer datum. It may contain bits of the previous 977 * field datum 978 */ 979 AcpiExGetBufferDatum (&ThisRawDatum, Buffer, 980 ObjDesc->CommonField.AccessByteWidth, DatumOffset); 981 982 /* Create the field datum based on the field alignment */ 983 984 if (ObjDesc->CommonField.StartFieldBitOffset != 0) 985 { 986 /* 987 * Put together appropriate bits of the two raw buffer data to make 988 * a single complete field datum 989 */ 990 MergedDatum = 991 (PreviousRawDatum >> ObjDesc->CommonField.DatumValidBits) | 992 (ThisRawDatum << ObjDesc->CommonField.StartFieldBitOffset); 993 } 994 995 else 996 { 997 /* Field began aligned on datum boundary */ 998 999 MergedDatum = ThisRawDatum; 1000 } 1001 1002 1003 /* 1004 * Special handling for the last datum if the field does NOT end on 1005 * a datum boundary. Update Rule must be applied to the bits outside 1006 * the field. 1007 */ 1008 if ((DatumOffset == DatumCount) && 1009 ObjDesc->CommonField.EndFieldValidBits) 1010 { 1011 /* 1012 * Part3: 1013 * This is the last datum and the field does not end on a datum boundary. 1014 * Build the partial datum and write with the update rule. 1015 */ 1016 1017 /* Mask off the unused bits above (after) the end-of-field */ 1018 1019 Mask = MASK_BITS_ABOVE (ObjDesc->CommonField.EndFieldValidBits); 1020 MergedDatum &= Mask; 1021 1022 /* Write the last datum with the update rule */ 1023 1024 Status = AcpiExWriteFieldDatumWithUpdateRule (ObjDesc, Mask, 1025 MergedDatum, FieldDatumByteOffset); 1026 if (ACPI_FAILURE (Status)) 1027 { 1028 return_ACPI_STATUS (Status); 1029 } 1030 } 1031 1032 else 1033 { 1034 /* Normal case -- write the completed datum */ 1035 1036 Status = AcpiExWriteFieldDatum (ObjDesc, 1037 FieldDatumByteOffset, MergedDatum); 1038 if (ACPI_FAILURE (Status)) 1039 { 1040 return_ACPI_STATUS (Status); 1041 } 1042 } 1043 1044 /* 1045 * Save the most recent datum since it may contain bits of the *next* 1046 * field datum. Update current byte offset. 1047 */ 1048 PreviousRawDatum = ThisRawDatum; 1049 } 1050 1051 1052 return_ACPI_STATUS (Status); 1053} 1054 1055 1056