1 /******************************************************************************
2 *
3 * Module Name: exfield - ACPI AML (p-code) execution - field manipulation
4 *
5 *****************************************************************************/
6
7 /******************************************************************************
8 *
9 * 1. Copyright Notice
10 *
11 * Some or all of this work - Copyright (c) 1999 - 2018, Intel Corp.
12 * All rights reserved.
13 *
14 * 2. License
15 *
16 * 2.1. This is your license from Intel Corp. under its intellectual property
17 * rights. You may have additional license terms from the party that provided
18 * you this software, covering your right to use that party's intellectual
19 * property rights.
20 *
21 * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
22 * copy of the source code appearing in this file ("Covered Code") an
23 * irrevocable, perpetual, worldwide license under Intel's copyrights in the
24 * base code distributed originally by Intel ("Original Intel Code") to copy,
25 * make derivatives, distribute, use and display any portion of the Covered
26 * Code in any form, with the right to sublicense such rights; and
27 *
28 * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
29 * license (with the right to sublicense), under only those claims of Intel
30 * patents that are infringed by the Original Intel Code, to make, use, sell,
31 * offer to sell, and import the Covered Code and derivative works thereof
32 * solely to the minimum extent necessary to exercise the above copyright
33 * license, and in no event shall the patent license extend to any additions
34 * to or modifications of the Original Intel Code. No other license or right
35 * is granted directly or by implication, estoppel or otherwise;
36 *
37 * The above copyright and patent license is granted only if the following
38 * conditions are met:
39 *
40 * 3. Conditions
41 *
42 * 3.1. Redistribution of Source with Rights to Further Distribute Source.
43 * Redistribution of source code of any substantial portion of the Covered
44 * Code or modification with rights to further distribute source must include
45 * the above Copyright Notice, the above License, this list of Conditions,
46 * and the following Disclaimer and Export Compliance provision. In addition,
47 * Licensee must cause all Covered Code to which Licensee contributes to
48 * contain a file documenting the changes Licensee made to create that Covered
49 * Code and the date of any change. Licensee must include in that file the
50 * documentation of any changes made by any predecessor Licensee. Licensee
51 * must include a prominent statement that the modification is derived,
52 * directly or indirectly, from Original Intel Code.
53 *
54 * 3.2. Redistribution of Source with no Rights to Further Distribute Source.
55 * Redistribution of source code of any substantial portion of the Covered
56 * Code or modification without rights to further distribute source must
57 * include the following Disclaimer and Export Compliance provision in the
58 * documentation and/or other materials provided with distribution. In
59 * addition, Licensee may not authorize further sublicense of source of any
60 * portion of the Covered Code, and must include terms to the effect that the
61 * license from Licensee to its licensee is limited to the intellectual
62 * property embodied in the software Licensee provides to its licensee, and
63 * not to intellectual property embodied in modifications its licensee may
64 * make.
65 *
66 * 3.3. Redistribution of Executable. Redistribution in executable form of any
67 * substantial portion of the Covered Code or modification must reproduce the
68 * above Copyright Notice, and the following Disclaimer and Export Compliance
69 * provision in the documentation and/or other materials provided with the
70 * distribution.
71 *
72 * 3.4. Intel retains all right, title, and interest in and to the Original
73 * Intel Code.
74 *
75 * 3.5. Neither the name Intel nor any other trademark owned or controlled by
76 * Intel shall be used in advertising or otherwise to promote the sale, use or
77 * other dealings in products derived from or relating to the Covered Code
78 * without prior written authorization from Intel.
79 *
80 * 4. Disclaimer and Export Compliance
81 *
82 * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
83 * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
84 * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE,
85 * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY
86 * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY
87 * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
88 * PARTICULAR PURPOSE.
89 *
90 * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
91 * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
92 * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
93 * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
94 * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
95 * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS
96 * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
97 * LIMITED REMEDY.
98 *
99 * 4.3. Licensee shall not export, either directly or indirectly, any of this
100 * software or system incorporating such software without first obtaining any
101 * required license or other approval from the U. S. Department of Commerce or
102 * any other agency or department of the United States Government. In the
103 * event Licensee exports any such software from the United States or
104 * re-exports any such software from a foreign destination, Licensee shall
105 * ensure that the distribution and export/re-export of the software is in
106 * compliance with all laws, regulations, orders, or other restrictions of the
107 * U.S. Export Administration Regulations. Licensee agrees that neither it nor
108 * any of its subsidiaries will export/re-export any technical data, process,
109 * software, or service, directly or indirectly, to any country for which the
110 * United States government or any agency thereof requires an export license,
111 * other governmental approval, or letter of assurance, without first obtaining
112 * such license, approval or letter.
113 *
114 *****************************************************************************
115 *
116 * Alternatively, you may choose to be licensed under the terms of the
117 * following license:
118 *
119 * Redistribution and use in source and binary forms, with or without
120 * modification, are permitted provided that the following conditions
121 * are met:
122 * 1. Redistributions of source code must retain the above copyright
123 * notice, this list of conditions, and the following disclaimer,
124 * without modification.
125 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
126 * substantially similar to the "NO WARRANTY" disclaimer below
127 * ("Disclaimer") and any redistribution must be conditioned upon
128 * including a substantially similar Disclaimer requirement for further
129 * binary redistribution.
130 * 3. Neither the names of the above-listed copyright holders nor the names
131 * of any contributors may be used to endorse or promote products derived
132 * from this software without specific prior written permission.
133 *
134 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
135 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
136 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
137 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
138 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
139 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
140 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
141 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
142 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
143 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
144 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
145 *
146 * Alternatively, you may choose to be licensed under the terms of the
147 * GNU General Public License ("GPL") version 2 as published by the Free
148 * Software Foundation.
149 *
150 *****************************************************************************/
151
152 #include "acpi.h"
153 #include "accommon.h"
154 #include "acdispat.h"
155 #include "acinterp.h"
156 #include "amlcode.h"
157
158
159 #define _COMPONENT ACPI_EXECUTER
160 ACPI_MODULE_NAME ("exfield")
161
162 /* Local prototypes */
163
164 static UINT32
165 AcpiExGetSerialAccessLength (
166 UINT32 AccessorType,
167 UINT32 AccessLength);
168
169
170 /*******************************************************************************
171 *
172 * FUNCTION: AcpiExGetSerialAccessLength
173 *
174 * PARAMETERS: AccessorType - The type of the protocol indicated by region
175 * field access attributes
176 * AccessLength - The access length of the region field
177 *
178 * RETURN: Decoded access length
179 *
180 * DESCRIPTION: This routine returns the length of the GenericSerialBus
181 * protocol bytes
182 *
183 ******************************************************************************/
184
185 static UINT32
AcpiExGetSerialAccessLength(UINT32 AccessorType,UINT32 AccessLength)186 AcpiExGetSerialAccessLength (
187 UINT32 AccessorType,
188 UINT32 AccessLength)
189 {
190 UINT32 Length;
191
192
193 switch (AccessorType)
194 {
195 case AML_FIELD_ATTRIB_QUICK:
196
197 Length = 0;
198 break;
199
200 case AML_FIELD_ATTRIB_SEND_RCV:
201 case AML_FIELD_ATTRIB_BYTE:
202
203 Length = 1;
204 break;
205
206 case AML_FIELD_ATTRIB_WORD:
207 case AML_FIELD_ATTRIB_WORD_CALL:
208
209 Length = 2;
210 break;
211
212 case AML_FIELD_ATTRIB_MULTIBYTE:
213 case AML_FIELD_ATTRIB_RAW_BYTES:
214 case AML_FIELD_ATTRIB_RAW_PROCESS:
215
216 Length = AccessLength;
217 break;
218
219 case AML_FIELD_ATTRIB_BLOCK:
220 case AML_FIELD_ATTRIB_BLOCK_CALL:
221 default:
222
223 Length = ACPI_GSBUS_BUFFER_SIZE - 2;
224 break;
225 }
226
227 return (Length);
228 }
229
230
231 /*******************************************************************************
232 *
233 * FUNCTION: AcpiExReadDataFromField
234 *
235 * PARAMETERS: WalkState - Current execution state
236 * ObjDesc - The named field
237 * RetBufferDesc - Where the return data object is stored
238 *
239 * RETURN: Status
240 *
241 * DESCRIPTION: Read from a named field. Returns either an Integer or a
242 * Buffer, depending on the size of the field.
243 *
244 ******************************************************************************/
245
246 ACPI_STATUS
AcpiExReadDataFromField(ACPI_WALK_STATE * WalkState,ACPI_OPERAND_OBJECT * ObjDesc,ACPI_OPERAND_OBJECT ** RetBufferDesc)247 AcpiExReadDataFromField (
248 ACPI_WALK_STATE *WalkState,
249 ACPI_OPERAND_OBJECT *ObjDesc,
250 ACPI_OPERAND_OBJECT **RetBufferDesc)
251 {
252 ACPI_STATUS Status;
253 ACPI_OPERAND_OBJECT *BufferDesc;
254 ACPI_SIZE Length;
255 void *Buffer;
256 UINT32 Function;
257 UINT16 AccessorType;
258
259
260 ACPI_FUNCTION_TRACE_PTR (ExReadDataFromField, ObjDesc);
261
262
263 /* Parameter validation */
264
265 if (!ObjDesc)
266 {
267 return_ACPI_STATUS (AE_AML_NO_OPERAND);
268 }
269 if (!RetBufferDesc)
270 {
271 return_ACPI_STATUS (AE_BAD_PARAMETER);
272 }
273
274 if (ObjDesc->Common.Type == ACPI_TYPE_BUFFER_FIELD)
275 {
276 /*
277 * If the BufferField arguments have not been previously evaluated,
278 * evaluate them now and save the results.
279 */
280 if (!(ObjDesc->Common.Flags & AOPOBJ_DATA_VALID))
281 {
282 Status = AcpiDsGetBufferFieldArguments (ObjDesc);
283 if (ACPI_FAILURE (Status))
284 {
285 return_ACPI_STATUS (Status);
286 }
287 }
288 }
289 else if ((ObjDesc->Common.Type == ACPI_TYPE_LOCAL_REGION_FIELD) &&
290 (ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_SMBUS ||
291 ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_GSBUS ||
292 ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_IPMI))
293 {
294 /*
295 * This is an SMBus, GSBus or IPMI read. We must create a buffer to
296 * hold the data and then directly access the region handler.
297 *
298 * Note: SMBus and GSBus protocol value is passed in upper 16-bits
299 * of Function
300 */
301 if (ObjDesc->Field.RegionObj->Region.SpaceId ==
302 ACPI_ADR_SPACE_SMBUS)
303 {
304 Length = ACPI_SMBUS_BUFFER_SIZE;
305 Function = ACPI_READ | (ObjDesc->Field.Attribute << 16);
306 }
307 else if (ObjDesc->Field.RegionObj->Region.SpaceId ==
308 ACPI_ADR_SPACE_GSBUS)
309 {
310 AccessorType = ObjDesc->Field.Attribute;
311 Length = AcpiExGetSerialAccessLength (
312 AccessorType, ObjDesc->Field.AccessLength);
313
314 /*
315 * Add additional 2 bytes for the GenericSerialBus data buffer:
316 *
317 * Status; (Byte 0 of the data buffer)
318 * Length; (Byte 1 of the data buffer)
319 * Data[x-1]: (Bytes 2-x of the arbitrary length data buffer)
320 */
321 Length += 2;
322 Function = ACPI_READ | (AccessorType << 16);
323 }
324 else /* IPMI */
325 {
326 Length = ACPI_IPMI_BUFFER_SIZE;
327 Function = ACPI_READ;
328 }
329
330 BufferDesc = AcpiUtCreateBufferObject (Length);
331 if (!BufferDesc)
332 {
333 return_ACPI_STATUS (AE_NO_MEMORY);
334 }
335
336 /* Lock entire transaction if requested */
337
338 AcpiExAcquireGlobalLock (ObjDesc->CommonField.FieldFlags);
339
340 /* Call the region handler for the read */
341
342 Status = AcpiExAccessRegion (ObjDesc, 0,
343 ACPI_CAST_PTR (UINT64, BufferDesc->Buffer.Pointer), Function);
344
345 AcpiExReleaseGlobalLock (ObjDesc->CommonField.FieldFlags);
346 goto Exit;
347 }
348
349 /*
350 * Allocate a buffer for the contents of the field.
351 *
352 * If the field is larger than the current integer width, create
353 * a BUFFER to hold it. Otherwise, use an INTEGER. This allows
354 * the use of arithmetic operators on the returned value if the
355 * field size is equal or smaller than an Integer.
356 *
357 * Note: Field.length is in bits.
358 */
359 Length = (ACPI_SIZE) ACPI_ROUND_BITS_UP_TO_BYTES (
360 ObjDesc->Field.BitLength);
361
362 if (Length > AcpiGbl_IntegerByteWidth)
363 {
364 /* Field is too large for an Integer, create a Buffer instead */
365
366 BufferDesc = AcpiUtCreateBufferObject (Length);
367 if (!BufferDesc)
368 {
369 return_ACPI_STATUS (AE_NO_MEMORY);
370 }
371 Buffer = BufferDesc->Buffer.Pointer;
372 }
373 else
374 {
375 /* Field will fit within an Integer (normal case) */
376
377 BufferDesc = AcpiUtCreateIntegerObject ((UINT64) 0);
378 if (!BufferDesc)
379 {
380 return_ACPI_STATUS (AE_NO_MEMORY);
381 }
382
383 Length = AcpiGbl_IntegerByteWidth;
384 Buffer = &BufferDesc->Integer.Value;
385 }
386
387 if ((ObjDesc->Common.Type == ACPI_TYPE_LOCAL_REGION_FIELD) &&
388 (ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_GPIO))
389 {
390 /*
391 * For GPIO (GeneralPurposeIo), the Address will be the bit offset
392 * from the previous Connection() operator, making it effectively a
393 * pin number index. The BitLength is the length of the field, which
394 * is thus the number of pins.
395 */
396 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
397 "GPIO FieldRead [FROM]: Pin %u Bits %u\n",
398 ObjDesc->Field.PinNumberIndex, ObjDesc->Field.BitLength));
399
400 /* Lock entire transaction if requested */
401
402 AcpiExAcquireGlobalLock (ObjDesc->CommonField.FieldFlags);
403
404 /* Perform the write */
405
406 Status = AcpiExAccessRegion (
407 ObjDesc, 0, (UINT64 *) Buffer, ACPI_READ);
408
409 AcpiExReleaseGlobalLock (ObjDesc->CommonField.FieldFlags);
410 if (ACPI_FAILURE (Status))
411 {
412 AcpiUtRemoveReference (BufferDesc);
413 }
414 else
415 {
416 *RetBufferDesc = BufferDesc;
417 }
418 return_ACPI_STATUS (Status);
419 }
420
421 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
422 "FieldRead [TO]: Obj %p, Type %X, Buf %p, ByteLen %X\n",
423 ObjDesc, ObjDesc->Common.Type, Buffer, (UINT32) Length));
424 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
425 "FieldRead [FROM]: BitLen %X, BitOff %X, ByteOff %X\n",
426 ObjDesc->CommonField.BitLength,
427 ObjDesc->CommonField.StartFieldBitOffset,
428 ObjDesc->CommonField.BaseByteOffset));
429
430 /* Lock entire transaction if requested */
431
432 AcpiExAcquireGlobalLock (ObjDesc->CommonField.FieldFlags);
433
434 /* Read from the field */
435
436 Status = AcpiExExtractFromField (ObjDesc, Buffer, (UINT32) Length);
437 AcpiExReleaseGlobalLock (ObjDesc->CommonField.FieldFlags);
438
439
440 Exit:
441 if (ACPI_FAILURE (Status))
442 {
443 AcpiUtRemoveReference (BufferDesc);
444 }
445 else
446 {
447 *RetBufferDesc = BufferDesc;
448 }
449
450 return_ACPI_STATUS (Status);
451 }
452
453
454 /*******************************************************************************
455 *
456 * FUNCTION: AcpiExWriteDataToField
457 *
458 * PARAMETERS: SourceDesc - Contains data to write
459 * ObjDesc - The named field
460 * ResultDesc - Where the return value is returned, if any
461 *
462 * RETURN: Status
463 *
464 * DESCRIPTION: Write to a named field
465 *
466 ******************************************************************************/
467
468 ACPI_STATUS
AcpiExWriteDataToField(ACPI_OPERAND_OBJECT * SourceDesc,ACPI_OPERAND_OBJECT * ObjDesc,ACPI_OPERAND_OBJECT ** ResultDesc)469 AcpiExWriteDataToField (
470 ACPI_OPERAND_OBJECT *SourceDesc,
471 ACPI_OPERAND_OBJECT *ObjDesc,
472 ACPI_OPERAND_OBJECT **ResultDesc)
473 {
474 ACPI_STATUS Status;
475 UINT32 Length;
476 void *Buffer;
477 ACPI_OPERAND_OBJECT *BufferDesc;
478 UINT32 Function;
479 UINT16 AccessorType;
480
481
482 ACPI_FUNCTION_TRACE_PTR (ExWriteDataToField, ObjDesc);
483
484
485 /* Parameter validation */
486
487 if (!SourceDesc || !ObjDesc)
488 {
489 return_ACPI_STATUS (AE_AML_NO_OPERAND);
490 }
491
492 if (ObjDesc->Common.Type == ACPI_TYPE_BUFFER_FIELD)
493 {
494 /*
495 * If the BufferField arguments have not been previously evaluated,
496 * evaluate them now and save the results.
497 */
498 if (!(ObjDesc->Common.Flags & AOPOBJ_DATA_VALID))
499 {
500 Status = AcpiDsGetBufferFieldArguments (ObjDesc);
501 if (ACPI_FAILURE (Status))
502 {
503 return_ACPI_STATUS (Status);
504 }
505 }
506 }
507 else if ((ObjDesc->Common.Type == ACPI_TYPE_LOCAL_REGION_FIELD) &&
508 (ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_SMBUS ||
509 ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_GSBUS ||
510 ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_IPMI))
511 {
512 /*
513 * This is an SMBus, GSBus or IPMI write. We will bypass the entire
514 * field mechanism and handoff the buffer directly to the handler.
515 * For these address spaces, the buffer is bi-directional; on a
516 * write, return data is returned in the same buffer.
517 *
518 * Source must be a buffer of sufficient size:
519 * ACPI_SMBUS_BUFFER_SIZE, ACPI_GSBUS_BUFFER_SIZE, or
520 * ACPI_IPMI_BUFFER_SIZE.
521 *
522 * Note: SMBus and GSBus protocol type is passed in upper 16-bits
523 * of Function
524 */
525 if (SourceDesc->Common.Type != ACPI_TYPE_BUFFER)
526 {
527 ACPI_ERROR ((AE_INFO,
528 "SMBus/IPMI/GenericSerialBus write requires "
529 "Buffer, found type %s",
530 AcpiUtGetObjectTypeName (SourceDesc)));
531
532 return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
533 }
534
535 if (ObjDesc->Field.RegionObj->Region.SpaceId ==
536 ACPI_ADR_SPACE_SMBUS)
537 {
538 Length = ACPI_SMBUS_BUFFER_SIZE;
539 Function = ACPI_WRITE | (ObjDesc->Field.Attribute << 16);
540 }
541 else if (ObjDesc->Field.RegionObj->Region.SpaceId ==
542 ACPI_ADR_SPACE_GSBUS)
543 {
544 AccessorType = ObjDesc->Field.Attribute;
545 Length = AcpiExGetSerialAccessLength (
546 AccessorType, ObjDesc->Field.AccessLength);
547
548 /*
549 * Add additional 2 bytes for the GenericSerialBus data buffer:
550 *
551 * Status; (Byte 0 of the data buffer)
552 * Length; (Byte 1 of the data buffer)
553 * Data[x-1]: (Bytes 2-x of the arbitrary length data buffer)
554 */
555 Length += 2;
556 Function = ACPI_WRITE | (AccessorType << 16);
557 }
558 else /* IPMI */
559 {
560 Length = ACPI_IPMI_BUFFER_SIZE;
561 Function = ACPI_WRITE;
562 }
563
564 if (SourceDesc->Buffer.Length < Length)
565 {
566 ACPI_ERROR ((AE_INFO,
567 "SMBus/IPMI/GenericSerialBus write requires "
568 "Buffer of length %u, found length %u",
569 Length, SourceDesc->Buffer.Length));
570
571 return_ACPI_STATUS (AE_AML_BUFFER_LIMIT);
572 }
573
574 /* Create the bi-directional buffer */
575
576 BufferDesc = AcpiUtCreateBufferObject (Length);
577 if (!BufferDesc)
578 {
579 return_ACPI_STATUS (AE_NO_MEMORY);
580 }
581
582 Buffer = BufferDesc->Buffer.Pointer;
583 memcpy (Buffer, SourceDesc->Buffer.Pointer, Length);
584
585 /* Lock entire transaction if requested */
586
587 AcpiExAcquireGlobalLock (ObjDesc->CommonField.FieldFlags);
588
589 /*
590 * Perform the write (returns status and perhaps data in the
591 * same buffer)
592 */
593 Status = AcpiExAccessRegion (
594 ObjDesc, 0, (UINT64 *) Buffer, Function);
595 AcpiExReleaseGlobalLock (ObjDesc->CommonField.FieldFlags);
596
597 *ResultDesc = BufferDesc;
598 return_ACPI_STATUS (Status);
599 }
600 else if ((ObjDesc->Common.Type == ACPI_TYPE_LOCAL_REGION_FIELD) &&
601 (ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_GPIO))
602 {
603 /*
604 * For GPIO (GeneralPurposeIo), we will bypass the entire field
605 * mechanism and handoff the bit address and bit width directly to
606 * the handler. The Address will be the bit offset
607 * from the previous Connection() operator, making it effectively a
608 * pin number index. The BitLength is the length of the field, which
609 * is thus the number of pins.
610 */
611 if (SourceDesc->Common.Type != ACPI_TYPE_INTEGER)
612 {
613 return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
614 }
615
616 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
617 "GPIO FieldWrite [FROM]: (%s:%X), Val %.8X [TO]: Pin %u Bits %u\n",
618 AcpiUtGetTypeName (SourceDesc->Common.Type),
619 SourceDesc->Common.Type, (UINT32) SourceDesc->Integer.Value,
620 ObjDesc->Field.PinNumberIndex, ObjDesc->Field.BitLength));
621
622 Buffer = &SourceDesc->Integer.Value;
623
624 /* Lock entire transaction if requested */
625
626 AcpiExAcquireGlobalLock (ObjDesc->CommonField.FieldFlags);
627
628 /* Perform the write */
629
630 Status = AcpiExAccessRegion (
631 ObjDesc, 0, (UINT64 *) Buffer, ACPI_WRITE);
632 AcpiExReleaseGlobalLock (ObjDesc->CommonField.FieldFlags);
633 return_ACPI_STATUS (Status);
634 }
635
636 /* Get a pointer to the data to be written */
637
638 switch (SourceDesc->Common.Type)
639 {
640 case ACPI_TYPE_INTEGER:
641
642 Buffer = &SourceDesc->Integer.Value;
643 Length = sizeof (SourceDesc->Integer.Value);
644 break;
645
646 case ACPI_TYPE_BUFFER:
647
648 Buffer = SourceDesc->Buffer.Pointer;
649 Length = SourceDesc->Buffer.Length;
650 break;
651
652 case ACPI_TYPE_STRING:
653
654 Buffer = SourceDesc->String.Pointer;
655 Length = SourceDesc->String.Length;
656 break;
657
658 default:
659
660 return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
661 }
662
663 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
664 "FieldWrite [FROM]: Obj %p (%s:%X), Buf %p, ByteLen %X\n",
665 SourceDesc, AcpiUtGetTypeName (SourceDesc->Common.Type),
666 SourceDesc->Common.Type, Buffer, Length));
667
668 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
669 "FieldWrite [TO]: Obj %p (%s:%X), BitLen %X, BitOff %X, ByteOff %X\n",
670 ObjDesc, AcpiUtGetTypeName (ObjDesc->Common.Type),
671 ObjDesc->Common.Type,
672 ObjDesc->CommonField.BitLength,
673 ObjDesc->CommonField.StartFieldBitOffset,
674 ObjDesc->CommonField.BaseByteOffset));
675
676 /* Lock entire transaction if requested */
677
678 AcpiExAcquireGlobalLock (ObjDesc->CommonField.FieldFlags);
679
680 /* Write to the field */
681
682 Status = AcpiExInsertIntoField (ObjDesc, Buffer, Length);
683 AcpiExReleaseGlobalLock (ObjDesc->CommonField.FieldFlags);
684
685 return_ACPI_STATUS (Status);
686 }
687