1 /******************************************************************************
2 *
3 * Module Name: exfldio - Aml Field I/O
4 *
5 *****************************************************************************/
6
7 /*
8 * Copyright (C) 2000 - 2014, Intel Corp.
9 * All rights reserved.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions, and the following disclaimer,
16 * without modification.
17 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
18 * substantially similar to the "NO WARRANTY" disclaimer below
19 * ("Disclaimer") and any redistribution must be conditioned upon
20 * including a substantially similar Disclaimer requirement for further
21 * binary redistribution.
22 * 3. Neither the names of the above-listed copyright holders nor the names
23 * of any contributors may be used to endorse or promote products derived
24 * from this software without specific prior written permission.
25 *
26 * Alternatively, this software may be distributed under the terms of the
27 * GNU General Public License ("GPL") version 2 as published by the Free
28 * Software Foundation.
29 *
30 * NO WARRANTY
31 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
32 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
33 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
34 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
35 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
36 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
37 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
38 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
39 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
40 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
41 * POSSIBILITY OF SUCH DAMAGES.
42 */
43
44
45 #define __EXFLDIO_C__
46
47 #include "acpi.h"
48 #include "accommon.h"
49 #include "acinterp.h"
50 #include "amlcode.h"
51 #include "acevents.h"
52 #include "acdispat.h"
53
54
55 #define _COMPONENT ACPI_EXECUTER
56 ACPI_MODULE_NAME ("exfldio")
57
58 /* Local prototypes */
59
60 static ACPI_STATUS
61 AcpiExFieldDatumIo (
62 ACPI_OPERAND_OBJECT *ObjDesc,
63 UINT32 FieldDatumByteOffset,
64 UINT64 *Value,
65 UINT32 ReadWrite);
66
67 static BOOLEAN
68 AcpiExRegisterOverflow (
69 ACPI_OPERAND_OBJECT *ObjDesc,
70 UINT64 Value);
71
72 static ACPI_STATUS
73 AcpiExSetupRegion (
74 ACPI_OPERAND_OBJECT *ObjDesc,
75 UINT32 FieldDatumByteOffset);
76
77
78 /*******************************************************************************
79 *
80 * FUNCTION: AcpiExSetupRegion
81 *
82 * PARAMETERS: ObjDesc - Field to be read or written
83 * FieldDatumByteOffset - Byte offset of this datum within the
84 * parent field
85 *
86 * RETURN: Status
87 *
88 * DESCRIPTION: Common processing for AcpiExExtractFromField and
89 * AcpiExInsertIntoField. Initialize the Region if necessary and
90 * validate the request.
91 *
92 ******************************************************************************/
93
94 static ACPI_STATUS
95 AcpiExSetupRegion (
96 ACPI_OPERAND_OBJECT *ObjDesc,
97 UINT32 FieldDatumByteOffset)
98 {
99 ACPI_STATUS Status = AE_OK;
100 ACPI_OPERAND_OBJECT *RgnDesc;
101 UINT8 SpaceId;
102
103
104 ACPI_FUNCTION_TRACE_U32 (ExSetupRegion, FieldDatumByteOffset);
105
106
107 RgnDesc = ObjDesc->CommonField.RegionObj;
108
109 /* We must have a valid region */
110
111 if (RgnDesc->Common.Type != ACPI_TYPE_REGION)
112 {
113 ACPI_ERROR ((AE_INFO, "Needed Region, found type 0x%X (%s)",
114 RgnDesc->Common.Type,
115 AcpiUtGetObjectTypeName (RgnDesc)));
116
117 return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
118 }
119
120 SpaceId = RgnDesc->Region.SpaceId;
121
122 /* Validate the Space ID */
123
124 if (!AcpiIsValidSpaceId (SpaceId))
125 {
126 ACPI_ERROR ((AE_INFO, "Invalid/unknown Address Space ID: 0x%2.2X", SpaceId));
127 return_ACPI_STATUS (AE_AML_INVALID_SPACE_ID);
128 }
129
130 /*
131 * If the Region Address and Length have not been previously evaluated,
132 * evaluate them now and save the results.
133 */
134 if (!(RgnDesc->Common.Flags & AOPOBJ_DATA_VALID))
135 {
136 Status = AcpiDsGetRegionArguments (RgnDesc);
137 if (ACPI_FAILURE (Status))
138 {
139 return_ACPI_STATUS (Status);
140 }
141 }
142
143 /*
144 * Exit now for SMBus, GSBus or IPMI address space, it has a non-linear
145 * address space and the request cannot be directly validated
146 */
147 if (SpaceId == ACPI_ADR_SPACE_SMBUS ||
148 SpaceId == ACPI_ADR_SPACE_GSBUS ||
149 SpaceId == ACPI_ADR_SPACE_IPMI)
150 {
151 /* SMBus or IPMI has a non-linear address space */
152
153 return_ACPI_STATUS (AE_OK);
154 }
155
156 #ifdef ACPI_UNDER_DEVELOPMENT
157 /*
158 * If the Field access is AnyAcc, we can now compute the optimal
159 * access (because we know know the length of the parent region)
160 */
161 if (!(ObjDesc->Common.Flags & AOPOBJ_DATA_VALID))
162 {
163 if (ACPI_FAILURE (Status))
164 {
165 return_ACPI_STATUS (Status);
166 }
167 }
168 #endif
169
170 /*
171 * Validate the request. The entire request from the byte offset for a
172 * length of one field datum (access width) must fit within the region.
173 * (Region length is specified in bytes)
174 */
175 if (RgnDesc->Region.Length <
176 (ObjDesc->CommonField.BaseByteOffset + FieldDatumByteOffset +
177 ObjDesc->CommonField.AccessByteWidth))
178 {
179 if (AcpiGbl_EnableInterpreterSlack)
180 {
181 /*
182 * Slack mode only: We will go ahead and allow access to this
183 * field if it is within the region length rounded up to the next
184 * access width boundary. ACPI_SIZE cast for 64-bit compile.
185 */
186 if (ACPI_ROUND_UP (RgnDesc->Region.Length,
187 ObjDesc->CommonField.AccessByteWidth) >=
188 ((ACPI_SIZE) ObjDesc->CommonField.BaseByteOffset +
189 ObjDesc->CommonField.AccessByteWidth +
190 FieldDatumByteOffset))
191 {
192 return_ACPI_STATUS (AE_OK);
193 }
194 }
195
196 if (RgnDesc->Region.Length < ObjDesc->CommonField.AccessByteWidth)
197 {
198 /*
199 * This is the case where the AccessType (AccWord, etc.) is wider
200 * than the region itself. For example, a region of length one
201 * byte, and a field with Dword access specified.
202 */
203 ACPI_ERROR ((AE_INFO,
204 "Field [%4.4s] access width (%u bytes) too large for region [%4.4s] (length %u)",
205 AcpiUtGetNodeName (ObjDesc->CommonField.Node),
206 ObjDesc->CommonField.AccessByteWidth,
207 AcpiUtGetNodeName (RgnDesc->Region.Node),
208 RgnDesc->Region.Length));
209 }
210
211 /*
212 * Offset rounded up to next multiple of field width
213 * exceeds region length, indicate an error
214 */
215 ACPI_ERROR ((AE_INFO,
216 "Field [%4.4s] Base+Offset+Width %u+%u+%u is beyond end of region [%4.4s] (length %u)",
217 AcpiUtGetNodeName (ObjDesc->CommonField.Node),
218 ObjDesc->CommonField.BaseByteOffset,
219 FieldDatumByteOffset, ObjDesc->CommonField.AccessByteWidth,
220 AcpiUtGetNodeName (RgnDesc->Region.Node),
221 RgnDesc->Region.Length));
222
223 return_ACPI_STATUS (AE_AML_REGION_LIMIT);
224 }
225
226 return_ACPI_STATUS (AE_OK);
227 }
228
229
230 /*******************************************************************************
231 *
232 * FUNCTION: AcpiExAccessRegion
233 *
234 * PARAMETERS: ObjDesc - Field to be read
235 * FieldDatumByteOffset - Byte offset of this datum within the
236 * parent field
237 * Value - Where to store value (must at least
238 * 64 bits)
239 * Function - Read or Write flag plus other region-
240 * dependent flags
241 *
242 * RETURN: Status
243 *
244 * DESCRIPTION: Read or Write a single field datum to an Operation Region.
245 *
246 ******************************************************************************/
247
248 ACPI_STATUS
249 AcpiExAccessRegion (
250 ACPI_OPERAND_OBJECT *ObjDesc,
251 UINT32 FieldDatumByteOffset,
252 UINT64 *Value,
253 UINT32 Function)
254 {
255 ACPI_STATUS Status;
256 ACPI_OPERAND_OBJECT *RgnDesc;
257 UINT32 RegionOffset;
258
259
260 ACPI_FUNCTION_TRACE (ExAccessRegion);
261
262
263 /*
264 * Ensure that the region operands are fully evaluated and verify
265 * the validity of the request
266 */
267 Status = AcpiExSetupRegion (ObjDesc, FieldDatumByteOffset);
268 if (ACPI_FAILURE (Status))
269 {
270 return_ACPI_STATUS (Status);
271 }
272
273 /*
274 * The physical address of this field datum is:
275 *
276 * 1) The base of the region, plus
277 * 2) The base offset of the field, plus
278 * 3) The current offset into the field
279 */
280 RgnDesc = ObjDesc->CommonField.RegionObj;
281 RegionOffset =
282 ObjDesc->CommonField.BaseByteOffset +
283 FieldDatumByteOffset;
284
285 if ((Function & ACPI_IO_MASK) == ACPI_READ)
286 {
287 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD, "[READ]"));
288 }
289 else
290 {
291 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD, "[WRITE]"));
292 }
293
294 ACPI_DEBUG_PRINT_RAW ((ACPI_DB_BFIELD,
295 " Region [%s:%X], Width %X, ByteBase %X, Offset %X at %p\n",
296 AcpiUtGetRegionName (RgnDesc->Region.SpaceId),
297 RgnDesc->Region.SpaceId,
298 ObjDesc->CommonField.AccessByteWidth,
299 ObjDesc->CommonField.BaseByteOffset,
300 FieldDatumByteOffset,
301 ACPI_CAST_PTR (void, (RgnDesc->Region.Address + RegionOffset))));
302
303 /* Invoke the appropriate AddressSpace/OpRegion handler */
304
305 Status = AcpiEvAddressSpaceDispatch (RgnDesc, ObjDesc,
306 Function, RegionOffset,
307 ACPI_MUL_8 (ObjDesc->CommonField.AccessByteWidth), Value);
308
309 if (ACPI_FAILURE (Status))
310 {
311 if (Status == AE_NOT_IMPLEMENTED)
312 {
313 ACPI_ERROR ((AE_INFO,
314 "Region %s (ID=%u) not implemented",
315 AcpiUtGetRegionName (RgnDesc->Region.SpaceId),
316 RgnDesc->Region.SpaceId));
317 }
318 else if (Status == AE_NOT_EXIST)
319 {
320 ACPI_ERROR ((AE_INFO,
321 "Region %s (ID=%u) has no handler",
322 AcpiUtGetRegionName (RgnDesc->Region.SpaceId),
323 RgnDesc->Region.SpaceId));
324 }
325 }
326
327 return_ACPI_STATUS (Status);
328 }
329
330
331 /*******************************************************************************
332 *
333 * FUNCTION: AcpiExRegisterOverflow
334 *
335 * PARAMETERS: ObjDesc - Register(Field) to be written
336 * Value - Value to be stored
337 *
338 * RETURN: TRUE if value overflows the field, FALSE otherwise
339 *
340 * DESCRIPTION: Check if a value is out of range of the field being written.
341 * Used to check if the values written to Index and Bank registers
342 * are out of range. Normally, the value is simply truncated
343 * to fit the field, but this case is most likely a serious
344 * coding error in the ASL.
345 *
346 ******************************************************************************/
347
348 static BOOLEAN
349 AcpiExRegisterOverflow (
350 ACPI_OPERAND_OBJECT *ObjDesc,
351 UINT64 Value)
352 {
353
354 if (ObjDesc->CommonField.BitLength >= ACPI_INTEGER_BIT_SIZE)
355 {
356 /*
357 * The field is large enough to hold the maximum integer, so we can
358 * never overflow it.
359 */
360 return (FALSE);
361 }
362
363 if (Value >= ((UINT64) 1 << ObjDesc->CommonField.BitLength))
364 {
365 /*
366 * The Value is larger than the maximum value that can fit into
367 * the register.
368 */
369 ACPI_ERROR ((AE_INFO,
370 "Index value 0x%8.8X%8.8X overflows field width 0x%X",
371 ACPI_FORMAT_UINT64 (Value),
372 ObjDesc->CommonField.BitLength));
373
374 return (TRUE);
375 }
376
377 /* The Value will fit into the field with no truncation */
378
379 return (FALSE);
380 }
381
382
383 /*******************************************************************************
384 *
385 * FUNCTION: AcpiExFieldDatumIo
386 *
387 * PARAMETERS: ObjDesc - Field to be read
388 * FieldDatumByteOffset - Byte offset of this datum within the
389 * parent field
390 * Value - Where to store value (must be 64 bits)
391 * ReadWrite - Read or Write flag
392 *
393 * RETURN: Status
394 *
395 * DESCRIPTION: Read or Write a single datum of a field. The FieldType is
396 * demultiplexed here to handle the different types of fields
397 * (BufferField, RegionField, IndexField, BankField)
398 *
399 ******************************************************************************/
400
401 static ACPI_STATUS
402 AcpiExFieldDatumIo (
403 ACPI_OPERAND_OBJECT *ObjDesc,
404 UINT32 FieldDatumByteOffset,
405 UINT64 *Value,
406 UINT32 ReadWrite)
407 {
408 ACPI_STATUS Status;
409 UINT64 LocalValue;
410
411
412 ACPI_FUNCTION_TRACE_U32 (ExFieldDatumIo, FieldDatumByteOffset);
413
414
415 if (ReadWrite == ACPI_READ)
416 {
417 if (!Value)
418 {
419 LocalValue = 0;
420
421 /* To support reads without saving return value */
422 Value = &LocalValue;
423 }
424
425 /* Clear the entire return buffer first, [Very Important!] */
426
427 *Value = 0;
428 }
429
430 /*
431 * The four types of fields are:
432 *
433 * BufferField - Read/write from/to a Buffer
434 * RegionField - Read/write from/to a Operation Region.
435 * BankField - Write to a Bank Register, then read/write from/to an
436 * OperationRegion
437 * IndexField - Write to an Index Register, then read/write from/to a
438 * Data Register
439 */
440 switch (ObjDesc->Common.Type)
441 {
442 case ACPI_TYPE_BUFFER_FIELD:
443 /*
444 * If the BufferField arguments have not been previously evaluated,
445 * evaluate them now and save the results.
446 */
447 if (!(ObjDesc->Common.Flags & AOPOBJ_DATA_VALID))
448 {
449 Status = AcpiDsGetBufferFieldArguments (ObjDesc);
450 if (ACPI_FAILURE (Status))
451 {
452 return_ACPI_STATUS (Status);
453 }
454 }
455
456 if (ReadWrite == ACPI_READ)
457 {
458 /*
459 * Copy the data from the source buffer.
460 * Length is the field width in bytes.
461 */
462 ACPI_MEMCPY (Value,
463 (ObjDesc->BufferField.BufferObj)->Buffer.Pointer +
464 ObjDesc->BufferField.BaseByteOffset +
465 FieldDatumByteOffset,
466 ObjDesc->CommonField.AccessByteWidth);
467 }
468 else
469 {
470 /*
471 * Copy the data to the target buffer.
472 * Length is the field width in bytes.
473 */
474 ACPI_MEMCPY ((ObjDesc->BufferField.BufferObj)->Buffer.Pointer +
475 ObjDesc->BufferField.BaseByteOffset +
476 FieldDatumByteOffset,
477 Value, ObjDesc->CommonField.AccessByteWidth);
478 }
479
480 Status = AE_OK;
481 break;
482
483 case ACPI_TYPE_LOCAL_BANK_FIELD:
484 /*
485 * Ensure that the BankValue is not beyond the capacity of
486 * the register
487 */
488 if (AcpiExRegisterOverflow (ObjDesc->BankField.BankObj,
489 (UINT64) ObjDesc->BankField.Value))
490 {
491 return_ACPI_STATUS (AE_AML_REGISTER_LIMIT);
492 }
493
494 /*
495 * For BankFields, we must write the BankValue to the BankRegister
496 * (itself a RegionField) before we can access the data.
497 */
498 Status = AcpiExInsertIntoField (ObjDesc->BankField.BankObj,
499 &ObjDesc->BankField.Value,
500 sizeof (ObjDesc->BankField.Value));
501 if (ACPI_FAILURE (Status))
502 {
503 return_ACPI_STATUS (Status);
504 }
505
506 /*
507 * Now that the Bank has been selected, fall through to the
508 * RegionField case and write the datum to the Operation Region
509 */
510
511 /*lint -fallthrough */
512
513 case ACPI_TYPE_LOCAL_REGION_FIELD:
514 /*
515 * For simple RegionFields, we just directly access the owning
516 * Operation Region.
517 */
518 Status = AcpiExAccessRegion (ObjDesc, FieldDatumByteOffset, Value,
519 ReadWrite);
520 break;
521
522 case ACPI_TYPE_LOCAL_INDEX_FIELD:
523 /*
524 * Ensure that the IndexValue is not beyond the capacity of
525 * the register
526 */
527 if (AcpiExRegisterOverflow (ObjDesc->IndexField.IndexObj,
528 (UINT64) ObjDesc->IndexField.Value))
529 {
530 return_ACPI_STATUS (AE_AML_REGISTER_LIMIT);
531 }
532
533 /* Write the index value to the IndexRegister (itself a RegionField) */
534
535 FieldDatumByteOffset += ObjDesc->IndexField.Value;
536
537 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
538 "Write to Index Register: Value %8.8X\n",
539 FieldDatumByteOffset));
540
541 Status = AcpiExInsertIntoField (ObjDesc->IndexField.IndexObj,
542 &FieldDatumByteOffset,
543 sizeof (FieldDatumByteOffset));
544 if (ACPI_FAILURE (Status))
545 {
546 return_ACPI_STATUS (Status);
547 }
548
549 if (ReadWrite == ACPI_READ)
550 {
551 /* Read the datum from the DataRegister */
552
553 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
554 "Read from Data Register\n"));
555
556 Status = AcpiExExtractFromField (ObjDesc->IndexField.DataObj,
557 Value, sizeof (UINT64));
558 }
559 else
560 {
561 /* Write the datum to the DataRegister */
562
563 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
564 "Write to Data Register: Value %8.8X%8.8X\n",
565 ACPI_FORMAT_UINT64 (*Value)));
566
567 Status = AcpiExInsertIntoField (ObjDesc->IndexField.DataObj,
568 Value, sizeof (UINT64));
569 }
570 break;
571
572 default:
573
574 ACPI_ERROR ((AE_INFO, "Wrong object type in field I/O %u",
575 ObjDesc->Common.Type));
576 Status = AE_AML_INTERNAL;
577 break;
578 }
579
580 if (ACPI_SUCCESS (Status))
581 {
582 if (ReadWrite == ACPI_READ)
583 {
584 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
585 "Value Read %8.8X%8.8X, Width %u\n",
586 ACPI_FORMAT_UINT64 (*Value),
587 ObjDesc->CommonField.AccessByteWidth));
588 }
589 else
590 {
591 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
592 "Value Written %8.8X%8.8X, Width %u\n",
593 ACPI_FORMAT_UINT64 (*Value),
594 ObjDesc->CommonField.AccessByteWidth));
595 }
596 }
597
598 return_ACPI_STATUS (Status);
599 }
600
601
602 /*******************************************************************************
603 *
604 * FUNCTION: AcpiExWriteWithUpdateRule
605 *
606 * PARAMETERS: ObjDesc - Field to be written
607 * Mask - bitmask within field datum
608 * FieldValue - Value to write
609 * FieldDatumByteOffset - Offset of datum within field
610 *
611 * RETURN: Status
612 *
613 * DESCRIPTION: Apply the field update rule to a field write
614 *
615 ******************************************************************************/
616
617 ACPI_STATUS
618 AcpiExWriteWithUpdateRule (
619 ACPI_OPERAND_OBJECT *ObjDesc,
620 UINT64 Mask,
621 UINT64 FieldValue,
622 UINT32 FieldDatumByteOffset)
623 {
624 ACPI_STATUS Status = AE_OK;
625 UINT64 MergedValue;
626 UINT64 CurrentValue;
627
628
629 ACPI_FUNCTION_TRACE_U32 (ExWriteWithUpdateRule, Mask);
630
631
632 /* Start with the new bits */
633
634 MergedValue = FieldValue;
635
636 /* If the mask is all ones, we don't need to worry about the update rule */
637
638 if (Mask != ACPI_UINT64_MAX)
639 {
640 /* Decode the update rule */
641
642 switch (ObjDesc->CommonField.FieldFlags & AML_FIELD_UPDATE_RULE_MASK)
643 {
644 case AML_FIELD_UPDATE_PRESERVE:
645 /*
646 * Check if update rule needs to be applied (not if mask is all
647 * ones) The left shift drops the bits we want to ignore.
648 */
649 if ((~Mask << (ACPI_MUL_8 (sizeof (Mask)) -
650 ACPI_MUL_8 (ObjDesc->CommonField.AccessByteWidth))) != 0)
651 {
652 /*
653 * Read the current contents of the byte/word/dword containing
654 * the field, and merge with the new field value.
655 */
656 Status = AcpiExFieldDatumIo (ObjDesc, FieldDatumByteOffset,
657 &CurrentValue, ACPI_READ);
658 if (ACPI_FAILURE (Status))
659 {
660 return_ACPI_STATUS (Status);
661 }
662
663 MergedValue |= (CurrentValue & ~Mask);
664 }
665 break;
666
667 case AML_FIELD_UPDATE_WRITE_AS_ONES:
668
669 /* Set positions outside the field to all ones */
670
671 MergedValue |= ~Mask;
672 break;
673
674 case AML_FIELD_UPDATE_WRITE_AS_ZEROS:
675
676 /* Set positions outside the field to all zeros */
677
678 MergedValue &= Mask;
679 break;
680
681 default:
682
683 ACPI_ERROR ((AE_INFO,
684 "Unknown UpdateRule value: 0x%X",
685 (ObjDesc->CommonField.FieldFlags & AML_FIELD_UPDATE_RULE_MASK)));
686 return_ACPI_STATUS (AE_AML_OPERAND_VALUE);
687 }
688 }
689
690 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
691 "Mask %8.8X%8.8X, DatumOffset %X, Width %X, Value %8.8X%8.8X, MergedValue %8.8X%8.8X\n",
692 ACPI_FORMAT_UINT64 (Mask),
693 FieldDatumByteOffset,
694 ObjDesc->CommonField.AccessByteWidth,
695 ACPI_FORMAT_UINT64 (FieldValue),
696 ACPI_FORMAT_UINT64 (MergedValue)));
697
698 /* Write the merged value */
699
700 Status = AcpiExFieldDatumIo (ObjDesc, FieldDatumByteOffset,
701 &MergedValue, ACPI_WRITE);
702
703 return_ACPI_STATUS (Status);
704 }
705
706
707 /*******************************************************************************
708 *
709 * FUNCTION: AcpiExExtractFromField
710 *
711 * PARAMETERS: ObjDesc - Field to be read
712 * Buffer - Where to store the field data
713 * BufferLength - Length of Buffer
714 *
715 * RETURN: Status
716 *
717 * DESCRIPTION: Retrieve the current value of the given field
718 *
719 ******************************************************************************/
720
721 ACPI_STATUS
722 AcpiExExtractFromField (
723 ACPI_OPERAND_OBJECT *ObjDesc,
724 void *Buffer,
725 UINT32 BufferLength)
726 {
727 ACPI_STATUS Status;
728 UINT64 RawDatum;
729 UINT64 MergedDatum;
730 UINT32 FieldOffset = 0;
731 UINT32 BufferOffset = 0;
732 UINT32 BufferTailBits;
733 UINT32 DatumCount;
734 UINT32 FieldDatumCount;
735 UINT32 AccessBitWidth;
736 UINT32 i;
737
738
739 ACPI_FUNCTION_TRACE (ExExtractFromField);
740
741
742 /* Validate target buffer and clear it */
743
744 if (BufferLength <
745 ACPI_ROUND_BITS_UP_TO_BYTES (ObjDesc->CommonField.BitLength))
746 {
747 ACPI_ERROR ((AE_INFO,
748 "Field size %u (bits) is too large for buffer (%u)",
749 ObjDesc->CommonField.BitLength, BufferLength));
750
751 return_ACPI_STATUS (AE_BUFFER_OVERFLOW);
752 }
753
754 ACPI_MEMSET (Buffer, 0, BufferLength);
755 AccessBitWidth = ACPI_MUL_8 (ObjDesc->CommonField.AccessByteWidth);
756
757 /* Handle the simple case here */
758
759 if ((ObjDesc->CommonField.StartFieldBitOffset == 0) &&
760 (ObjDesc->CommonField.BitLength == AccessBitWidth))
761 {
762 if (BufferLength >= sizeof (UINT64))
763 {
764 Status = AcpiExFieldDatumIo (ObjDesc, 0, Buffer, ACPI_READ);
765 }
766 else
767 {
768 /* Use RawDatum (UINT64) to handle buffers < 64 bits */
769
770 Status = AcpiExFieldDatumIo (ObjDesc, 0, &RawDatum, ACPI_READ);
771 ACPI_MEMCPY (Buffer, &RawDatum, BufferLength);
772 }
773
774 return_ACPI_STATUS (Status);
775 }
776
777 /* TBD: Move to common setup code */
778
779 /* Field algorithm is limited to sizeof(UINT64), truncate if needed */
780
781 if (ObjDesc->CommonField.AccessByteWidth > sizeof (UINT64))
782 {
783 ObjDesc->CommonField.AccessByteWidth = sizeof (UINT64);
784 AccessBitWidth = sizeof (UINT64) * 8;
785 }
786
787 /* Compute the number of datums (access width data items) */
788
789 DatumCount = ACPI_ROUND_UP_TO (
790 ObjDesc->CommonField.BitLength, AccessBitWidth);
791
792 FieldDatumCount = ACPI_ROUND_UP_TO (
793 ObjDesc->CommonField.BitLength +
794 ObjDesc->CommonField.StartFieldBitOffset, AccessBitWidth);
795
796 /* Priming read from the field */
797
798 Status = AcpiExFieldDatumIo (ObjDesc, FieldOffset, &RawDatum, ACPI_READ);
799 if (ACPI_FAILURE (Status))
800 {
801 return_ACPI_STATUS (Status);
802 }
803 MergedDatum = RawDatum >> ObjDesc->CommonField.StartFieldBitOffset;
804
805 /* Read the rest of the field */
806
807 for (i = 1; i < FieldDatumCount; i++)
808 {
809 /* Get next input datum from the field */
810
811 FieldOffset += ObjDesc->CommonField.AccessByteWidth;
812 Status = AcpiExFieldDatumIo (ObjDesc, FieldOffset,
813 &RawDatum, ACPI_READ);
814 if (ACPI_FAILURE (Status))
815 {
816 return_ACPI_STATUS (Status);
817 }
818
819 /*
820 * Merge with previous datum if necessary.
821 *
822 * Note: Before the shift, check if the shift value will be larger than
823 * the integer size. If so, there is no need to perform the operation.
824 * This avoids the differences in behavior between different compilers
825 * concerning shift values larger than the target data width.
826 */
827 if (AccessBitWidth - ObjDesc->CommonField.StartFieldBitOffset <
828 ACPI_INTEGER_BIT_SIZE)
829 {
830 MergedDatum |= RawDatum <<
831 (AccessBitWidth - ObjDesc->CommonField.StartFieldBitOffset);
832 }
833
834 if (i == DatumCount)
835 {
836 break;
837 }
838
839 /* Write merged datum to target buffer */
840
841 ACPI_MEMCPY (((char *) Buffer) + BufferOffset, &MergedDatum,
842 ACPI_MIN(ObjDesc->CommonField.AccessByteWidth,
843 BufferLength - BufferOffset));
844
845 BufferOffset += ObjDesc->CommonField.AccessByteWidth;
846 MergedDatum = RawDatum >> ObjDesc->CommonField.StartFieldBitOffset;
847 }
848
849 /* Mask off any extra bits in the last datum */
850
851 BufferTailBits = ObjDesc->CommonField.BitLength % AccessBitWidth;
852 if (BufferTailBits)
853 {
854 MergedDatum &= ACPI_MASK_BITS_ABOVE (BufferTailBits);
855 }
856
857 /* Write the last datum to the buffer */
858
859 ACPI_MEMCPY (((char *) Buffer) + BufferOffset, &MergedDatum,
860 ACPI_MIN(ObjDesc->CommonField.AccessByteWidth,
861 BufferLength - BufferOffset));
862
863 return_ACPI_STATUS (AE_OK);
864 }
865
866
867 /*******************************************************************************
868 *
869 * FUNCTION: AcpiExInsertIntoField
870 *
871 * PARAMETERS: ObjDesc - Field to be written
872 * Buffer - Data to be written
873 * BufferLength - Length of Buffer
874 *
875 * RETURN: Status
876 *
877 * DESCRIPTION: Store the Buffer contents into the given field
878 *
879 ******************************************************************************/
880
881 ACPI_STATUS
882 AcpiExInsertIntoField (
883 ACPI_OPERAND_OBJECT *ObjDesc,
884 void *Buffer,
885 UINT32 BufferLength)
886 {
887 void *NewBuffer;
888 ACPI_STATUS Status;
889 UINT64 Mask;
890 UINT64 WidthMask;
891 UINT64 MergedDatum;
892 UINT64 RawDatum = 0;
893 UINT32 FieldOffset = 0;
894 UINT32 BufferOffset = 0;
895 UINT32 BufferTailBits;
896 UINT32 DatumCount;
897 UINT32 FieldDatumCount;
898 UINT32 AccessBitWidth;
899 UINT32 RequiredLength;
900 UINT32 i;
901
902
903 ACPI_FUNCTION_TRACE (ExInsertIntoField);
904
905
906 /* Validate input buffer */
907
908 NewBuffer = NULL;
909 RequiredLength = ACPI_ROUND_BITS_UP_TO_BYTES (
910 ObjDesc->CommonField.BitLength);
911 /*
912 * We must have a buffer that is at least as long as the field
913 * we are writing to. This is because individual fields are
914 * indivisible and partial writes are not supported -- as per
915 * the ACPI specification.
916 */
917 if (BufferLength < RequiredLength)
918 {
919 /* We need to create a new buffer */
920
921 NewBuffer = ACPI_ALLOCATE_ZEROED (RequiredLength);
922 if (!NewBuffer)
923 {
924 return_ACPI_STATUS (AE_NO_MEMORY);
925 }
926
927 /*
928 * Copy the original data to the new buffer, starting
929 * at Byte zero. All unused (upper) bytes of the
930 * buffer will be 0.
931 */
932 ACPI_MEMCPY ((char *) NewBuffer, (char *) Buffer, BufferLength);
933 Buffer = NewBuffer;
934 BufferLength = RequiredLength;
935 }
936
937 /* TBD: Move to common setup code */
938
939 /* Algo is limited to sizeof(UINT64), so cut the AccessByteWidth */
940 if (ObjDesc->CommonField.AccessByteWidth > sizeof (UINT64))
941 {
942 ObjDesc->CommonField.AccessByteWidth = sizeof (UINT64);
943 }
944
945 AccessBitWidth = ACPI_MUL_8 (ObjDesc->CommonField.AccessByteWidth);
946
947 /*
948 * Create the bitmasks used for bit insertion.
949 * Note: This if/else is used to bypass compiler differences with the
950 * shift operator
951 */
952 if (AccessBitWidth == ACPI_INTEGER_BIT_SIZE)
953 {
954 WidthMask = ACPI_UINT64_MAX;
955 }
956 else
957 {
958 WidthMask = ACPI_MASK_BITS_ABOVE (AccessBitWidth);
959 }
960
961 Mask = WidthMask &
962 ACPI_MASK_BITS_BELOW (ObjDesc->CommonField.StartFieldBitOffset);
963
964 /* Compute the number of datums (access width data items) */
965
966 DatumCount = ACPI_ROUND_UP_TO (ObjDesc->CommonField.BitLength,
967 AccessBitWidth);
968
969 FieldDatumCount = ACPI_ROUND_UP_TO (ObjDesc->CommonField.BitLength +
970 ObjDesc->CommonField.StartFieldBitOffset,
971 AccessBitWidth);
972
973 /* Get initial Datum from the input buffer */
974
975 ACPI_MEMCPY (&RawDatum, Buffer,
976 ACPI_MIN(ObjDesc->CommonField.AccessByteWidth,
977 BufferLength - BufferOffset));
978
979 MergedDatum = RawDatum << ObjDesc->CommonField.StartFieldBitOffset;
980
981 /* Write the entire field */
982
983 for (i = 1; i < FieldDatumCount; i++)
984 {
985 /* Write merged datum to the target field */
986
987 MergedDatum &= Mask;
988 Status = AcpiExWriteWithUpdateRule (ObjDesc, Mask,
989 MergedDatum, FieldOffset);
990 if (ACPI_FAILURE (Status))
991 {
992 goto Exit;
993 }
994
995 FieldOffset += ObjDesc->CommonField.AccessByteWidth;
996
997 /*
998 * Start new output datum by merging with previous input datum
999 * if necessary.
1000 *
1001 * Note: Before the shift, check if the shift value will be larger than
1002 * the integer size. If so, there is no need to perform the operation.
1003 * This avoids the differences in behavior between different compilers
1004 * concerning shift values larger than the target data width.
1005 */
1006 if ((AccessBitWidth - ObjDesc->CommonField.StartFieldBitOffset) <
1007 ACPI_INTEGER_BIT_SIZE)
1008 {
1009 MergedDatum = RawDatum >>
1010 (AccessBitWidth - ObjDesc->CommonField.StartFieldBitOffset);
1011 }
1012 else
1013 {
1014 MergedDatum = 0;
1015 }
1016
1017 Mask = WidthMask;
1018
1019 if (i == DatumCount)
1020 {
1021 break;
1022 }
1023
1024 /* Get the next input datum from the buffer */
1025
1026 BufferOffset += ObjDesc->CommonField.AccessByteWidth;
1027 ACPI_MEMCPY (&RawDatum, ((char *) Buffer) + BufferOffset,
1028 ACPI_MIN(ObjDesc->CommonField.AccessByteWidth,
1029 BufferLength - BufferOffset));
1030
1031 MergedDatum |= RawDatum << ObjDesc->CommonField.StartFieldBitOffset;
1032 }
1033
1034 /* Mask off any extra bits in the last datum */
1035
1036 BufferTailBits = (ObjDesc->CommonField.BitLength +
1037 ObjDesc->CommonField.StartFieldBitOffset) % AccessBitWidth;
1038 if (BufferTailBits)
1039 {
1040 Mask &= ACPI_MASK_BITS_ABOVE (BufferTailBits);
1041 }
1042
1043 /* Write the last datum to the field */
1044
1045 MergedDatum &= Mask;
1046 Status = AcpiExWriteWithUpdateRule (ObjDesc,
1047 Mask, MergedDatum, FieldOffset);
1048
1049 Exit:
1050 /* Free temporary buffer if we used one */
1051
1052 if (NewBuffer)
1053 {
1054 ACPI_FREE (NewBuffer);
1055 }
1056 return_ACPI_STATUS (Status);
1057 }