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1/******************************************************************************
2 *
3 * Module Name: exfldio - Aml Field I/O
4 *
5 *****************************************************************************/
6
7/*
8 * Copyright (C) 2000 - 2005, R. Byron Moore
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#include <acpi/acpi.h>
46#include <acpi/acinterp.h>
47#include <acpi/amlcode.h>
48#include <acpi/acevents.h>
49#include <acpi/acdispat.h>
50
51
52#define _COMPONENT ACPI_EXECUTER
53 ACPI_MODULE_NAME ("exfldio")
54
55
56/*******************************************************************************
57 *
58 * FUNCTION: acpi_ex_setup_region
59 *
60 * PARAMETERS: *obj_desc - Field to be read or written
61 * field_datum_byte_offset - Byte offset of this datum within the
62 * parent field
63 *
64 * RETURN: Status
65 *
66 * DESCRIPTION: Common processing for acpi_ex_extract_from_field and
67 * acpi_ex_insert_into_field. Initialize the Region if necessary and
68 * validate the request.
69 *
70 ******************************************************************************/
71
72acpi_status
73acpi_ex_setup_region (
74 union acpi_operand_object *obj_desc,
75 u32 field_datum_byte_offset)
76{
77 acpi_status status = AE_OK;
78 union acpi_operand_object *rgn_desc;
79
80
81 ACPI_FUNCTION_TRACE_U32 ("ex_setup_region", field_datum_byte_offset);
82
83
84 rgn_desc = obj_desc->common_field.region_obj;
85
86 /* We must have a valid region */
87
88 if (ACPI_GET_OBJECT_TYPE (rgn_desc) != ACPI_TYPE_REGION) {
89 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Needed Region, found type %X (%s)\n",
90 ACPI_GET_OBJECT_TYPE (rgn_desc),
91 acpi_ut_get_object_type_name (rgn_desc)));
92
93 return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
94 }
95
96 /*
97 * If the Region Address and Length have not been previously evaluated,
98 * evaluate them now and save the results.
99 */
100 if (!(rgn_desc->common.flags & AOPOBJ_DATA_VALID)) {
101 status = acpi_ds_get_region_arguments (rgn_desc);
102 if (ACPI_FAILURE (status)) {
103 return_ACPI_STATUS (status);
104 }
105 }
106
107 if (rgn_desc->region.space_id == ACPI_ADR_SPACE_SMBUS) {
108 /* SMBus has a non-linear address space */
109
110 return_ACPI_STATUS (AE_OK);
111 }
112
113#ifdef ACPI_UNDER_DEVELOPMENT
114 /*
115 * If the Field access is any_acc, we can now compute the optimal
116 * access (because we know know the length of the parent region)
117 */
118 if (!(obj_desc->common.flags & AOPOBJ_DATA_VALID)) {
119 if (ACPI_FAILURE (status)) {
120 return_ACPI_STATUS (status);
121 }
122 }
123#endif
124
125 /*
126 * Validate the request. The entire request from the byte offset for a
127 * length of one field datum (access width) must fit within the region.
128 * (Region length is specified in bytes)
129 */
130 if (rgn_desc->region.length < (obj_desc->common_field.base_byte_offset
131 + field_datum_byte_offset
132 + obj_desc->common_field.access_byte_width)) {
133 if (acpi_gbl_enable_interpreter_slack) {
134 /*
135 * Slack mode only: We will go ahead and allow access to this
136 * field if it is within the region length rounded up to the next
137 * access width boundary.
138 */
139 if (ACPI_ROUND_UP (rgn_desc->region.length,
140 obj_desc->common_field.access_byte_width) >=
141 (obj_desc->common_field.base_byte_offset +
142 (acpi_native_uint) obj_desc->common_field.access_byte_width +
143 field_datum_byte_offset)) {
144 return_ACPI_STATUS (AE_OK);
145 }
146 }
147
148 if (rgn_desc->region.length < obj_desc->common_field.access_byte_width) {
149 /*
150 * This is the case where the access_type (acc_word, etc.) is wider
151 * than the region itself. For example, a region of length one
152 * byte, and a field with Dword access specified.
153 */
154 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
155 "Field [%4.4s] access width (%d bytes) too large for region [%4.4s] (length %X)\n",
156 acpi_ut_get_node_name (obj_desc->common_field.node),
157 obj_desc->common_field.access_byte_width,
158 acpi_ut_get_node_name (rgn_desc->region.node), rgn_desc->region.length));
159 }
160
161 /*
162 * Offset rounded up to next multiple of field width
163 * exceeds region length, indicate an error
164 */
165 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
166 "Field [%4.4s] Base+Offset+Width %X+%X+%X is beyond end of region [%4.4s] (length %X)\n",
167 acpi_ut_get_node_name (obj_desc->common_field.node),
168 obj_desc->common_field.base_byte_offset,
169 field_datum_byte_offset, obj_desc->common_field.access_byte_width,
170 acpi_ut_get_node_name (rgn_desc->region.node), rgn_desc->region.length));
171
172 return_ACPI_STATUS (AE_AML_REGION_LIMIT);
173 }
174
175 return_ACPI_STATUS (AE_OK);
176}
177
178
179/*******************************************************************************
180 *
181 * FUNCTION: acpi_ex_access_region
182 *
183 * PARAMETERS: *obj_desc - Field to be read
184 * field_datum_byte_offset - Byte offset of this datum within the
185 * parent field
186 * *Value - Where to store value (must at least
187 * the size of acpi_integer)
188 * Function - Read or Write flag plus other region-
189 * dependent flags
190 *
191 * RETURN: Status
192 *
193 * DESCRIPTION: Read or Write a single field datum to an Operation Region.
194 *
195 ******************************************************************************/
196
197acpi_status
198acpi_ex_access_region (
199 union acpi_operand_object *obj_desc,
200 u32 field_datum_byte_offset,
201 acpi_integer *value,
202 u32 function)
203{
204 acpi_status status;
205 union acpi_operand_object *rgn_desc;
206 acpi_physical_address address;
207
208
209 ACPI_FUNCTION_TRACE ("ex_access_region");
210
211
212 /*
213 * Ensure that the region operands are fully evaluated and verify
214 * the validity of the request
215 */
216 status = acpi_ex_setup_region (obj_desc, field_datum_byte_offset);
217 if (ACPI_FAILURE (status)) {
218 return_ACPI_STATUS (status);
219 }
220
221 /*
222 * The physical address of this field datum is:
223 *
224 * 1) The base of the region, plus
225 * 2) The base offset of the field, plus
226 * 3) The current offset into the field
227 */
228 rgn_desc = obj_desc->common_field.region_obj;
229 address = rgn_desc->region.address
230 + obj_desc->common_field.base_byte_offset
231 + field_datum_byte_offset;
232
233 if ((function & ACPI_IO_MASK) == ACPI_READ) {
234 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD, "[READ]"));
235 }
236 else {
237 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD, "[WRITE]"));
238 }
239
240 ACPI_DEBUG_PRINT_RAW ((ACPI_DB_BFIELD,
241 " Region [%s:%X], Width %X, byte_base %X, Offset %X at %8.8X%8.8X\n",
242 acpi_ut_get_region_name (rgn_desc->region.space_id),
243 rgn_desc->region.space_id,
244 obj_desc->common_field.access_byte_width,
245 obj_desc->common_field.base_byte_offset,
246 field_datum_byte_offset,
247 ACPI_FORMAT_UINT64 (address)));
248
249 /* Invoke the appropriate address_space/op_region handler */
250
251 status = acpi_ev_address_space_dispatch (rgn_desc, function,
252 address, ACPI_MUL_8 (obj_desc->common_field.access_byte_width), value);
253
254 if (ACPI_FAILURE (status)) {
255 if (status == AE_NOT_IMPLEMENTED) {
256 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
257 "Region %s(%X) not implemented\n",
258 acpi_ut_get_region_name (rgn_desc->region.space_id),
259 rgn_desc->region.space_id));
260 }
261 else if (status == AE_NOT_EXIST) {
262 ACPI_REPORT_ERROR ((
263 "Region %s(%X) has no handler\n",
264 acpi_ut_get_region_name (rgn_desc->region.space_id),
265 rgn_desc->region.space_id));
266 }
267 }
268
269 return_ACPI_STATUS (status);
270}
271
272
273/*******************************************************************************
274 *
275 * FUNCTION: acpi_ex_register_overflow
276 *
277 * PARAMETERS: *obj_desc - Register(Field) to be written
278 * Value - Value to be stored
279 *
280 * RETURN: TRUE if value overflows the field, FALSE otherwise
281 *
282 * DESCRIPTION: Check if a value is out of range of the field being written.
283 * Used to check if the values written to Index and Bank registers
284 * are out of range. Normally, the value is simply truncated
285 * to fit the field, but this case is most likely a serious
286 * coding error in the ASL.
287 *
288 ******************************************************************************/
289
290u8
291acpi_ex_register_overflow (
292 union acpi_operand_object *obj_desc,
293 acpi_integer value)
294{
295
296 if (obj_desc->common_field.bit_length >= ACPI_INTEGER_BIT_SIZE) {
297 /*
298 * The field is large enough to hold the maximum integer, so we can
299 * never overflow it.
300 */
301 return (FALSE);
302 }
303
304 if (value >= ((acpi_integer) 1 << obj_desc->common_field.bit_length)) {
305 /*
306 * The Value is larger than the maximum value that can fit into
307 * the register.
308 */
309 return (TRUE);
310 }
311
312 /* The Value will fit into the field with no truncation */
313
314 return (FALSE);
315}
316
317
318/*******************************************************************************
319 *
320 * FUNCTION: acpi_ex_field_datum_io
321 *
322 * PARAMETERS: *obj_desc - Field to be read
323 * field_datum_byte_offset - Byte offset of this datum within the
324 * parent field
325 * *Value - Where to store value (must be 64 bits)
326 * read_write - Read or Write flag
327 *
328 * RETURN: Status
329 *
330 * DESCRIPTION: Read or Write a single datum of a field. The field_type is
331 * demultiplexed here to handle the different types of fields
332 * (buffer_field, region_field, index_field, bank_field)
333 *
334 ******************************************************************************/
335
336acpi_status
337acpi_ex_field_datum_io (
338 union acpi_operand_object *obj_desc,
339 u32 field_datum_byte_offset,
340 acpi_integer *value,
341 u32 read_write)
342{
343 acpi_status status;
344 acpi_integer local_value;
345
346
347 ACPI_FUNCTION_TRACE_U32 ("ex_field_datum_io", field_datum_byte_offset);
348
349
350 if (read_write == ACPI_READ) {
351 if (!value) {
352 local_value = 0;
353 value = &local_value; /* To support reads without saving return value */
354 }
355
356 /* Clear the entire return buffer first, [Very Important!] */
357
358 *value = 0;
359 }
360
361 /*
362 * The four types of fields are:
363 *
364 * buffer_field - Read/write from/to a Buffer
365 * region_field - Read/write from/to a Operation Region.
366 * bank_field - Write to a Bank Register, then read/write from/to an op_region
367 * index_field - Write to an Index Register, then read/write from/to a Data Register
368 */
369 switch (ACPI_GET_OBJECT_TYPE (obj_desc)) {
370 case ACPI_TYPE_BUFFER_FIELD:
371 /*
372 * If the buffer_field arguments have not been previously evaluated,
373 * evaluate them now and save the results.
374 */
375 if (!(obj_desc->common.flags & AOPOBJ_DATA_VALID)) {
376 status = acpi_ds_get_buffer_field_arguments (obj_desc);
377 if (ACPI_FAILURE (status)) {
378 return_ACPI_STATUS (status);
379 }
380 }
381
382 if (read_write == ACPI_READ) {
383 /*
384 * Copy the data from the source buffer.
385 * Length is the field width in bytes.
386 */
387 ACPI_MEMCPY (value, (obj_desc->buffer_field.buffer_obj)->buffer.pointer
388 + obj_desc->buffer_field.base_byte_offset
389 + field_datum_byte_offset,
390 obj_desc->common_field.access_byte_width);
391 }
392 else {
393 /*
394 * Copy the data to the target buffer.
395 * Length is the field width in bytes.
396 */
397 ACPI_MEMCPY ((obj_desc->buffer_field.buffer_obj)->buffer.pointer
398 + obj_desc->buffer_field.base_byte_offset
399 + field_datum_byte_offset,
400 value, obj_desc->common_field.access_byte_width);
401 }
402
403 status = AE_OK;
404 break;
405
406
407 case ACPI_TYPE_LOCAL_BANK_FIELD:
408
409 /* Ensure that the bank_value is not beyond the capacity of the register */
410
411 if (acpi_ex_register_overflow (obj_desc->bank_field.bank_obj,
412 (acpi_integer) obj_desc->bank_field.value)) {
413 return_ACPI_STATUS (AE_AML_REGISTER_LIMIT);
414 }
415
416 /*
417 * For bank_fields, we must write the bank_value to the bank_register
418 * (itself a region_field) before we can access the data.
419 */
420 status = acpi_ex_insert_into_field (obj_desc->bank_field.bank_obj,
421 &obj_desc->bank_field.value,
422 sizeof (obj_desc->bank_field.value));
423 if (ACPI_FAILURE (status)) {
424 return_ACPI_STATUS (status);
425 }
426
427 /*
428 * Now that the Bank has been selected, fall through to the
429 * region_field case and write the datum to the Operation Region
430 */
431
432 /*lint -fallthrough */
433
434
435 case ACPI_TYPE_LOCAL_REGION_FIELD:
436 /*
437 * For simple region_fields, we just directly access the owning
438 * Operation Region.
439 */
440 status = acpi_ex_access_region (obj_desc, field_datum_byte_offset, value,
441 read_write);
442 break;
443
444
445 case ACPI_TYPE_LOCAL_INDEX_FIELD:
446
447
448 /* Ensure that the index_value is not beyond the capacity of the register */
449
450 if (acpi_ex_register_overflow (obj_desc->index_field.index_obj,
451 (acpi_integer) obj_desc->index_field.value)) {
452 return_ACPI_STATUS (AE_AML_REGISTER_LIMIT);
453 }
454
455 /* Write the index value to the index_register (itself a region_field) */
456
457 field_datum_byte_offset += obj_desc->index_field.value;
458
459 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
460 "Write to Index Register: Value %8.8X\n",
461 field_datum_byte_offset));
462
463 status = acpi_ex_insert_into_field (obj_desc->index_field.index_obj,
464 &field_datum_byte_offset,
465 sizeof (field_datum_byte_offset));
466 if (ACPI_FAILURE (status)) {
467 return_ACPI_STATUS (status);
468 }
469
470 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
471 "I/O to Data Register: value_ptr %p\n",
472 value));
473
474 if (read_write == ACPI_READ) {
475 /* Read the datum from the data_register */
476
477 status = acpi_ex_extract_from_field (obj_desc->index_field.data_obj,
478 value, sizeof (acpi_integer));
479 }
480 else {
481 /* Write the datum to the data_register */
482
483 status = acpi_ex_insert_into_field (obj_desc->index_field.data_obj,
484 value, sizeof (acpi_integer));
485 }
486 break;
487
488
489 default:
490
491 ACPI_REPORT_ERROR (("Wrong object type in field I/O %X\n",
492 ACPI_GET_OBJECT_TYPE (obj_desc)));
493 status = AE_AML_INTERNAL;
494 break;
495 }
496
497 if (ACPI_SUCCESS (status)) {
498 if (read_write == ACPI_READ) {
499 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD, "Value Read %8.8X%8.8X, Width %d\n",
500 ACPI_FORMAT_UINT64 (*value),
501 obj_desc->common_field.access_byte_width));
502 }
503 else {
504 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD, "Value Written %8.8X%8.8X, Width %d\n",
505 ACPI_FORMAT_UINT64 (*value),
506 obj_desc->common_field.access_byte_width));
507 }
508 }
509
510 return_ACPI_STATUS (status);
511}
512
513
514/*******************************************************************************
515 *
516 * FUNCTION: acpi_ex_write_with_update_rule
517 *
518 * PARAMETERS: *obj_desc - Field to be set
519 * Value - Value to store
520 *
521 * RETURN: Status
522 *
523 * DESCRIPTION: Apply the field update rule to a field write
524 *
525 ******************************************************************************/
526
527acpi_status
528acpi_ex_write_with_update_rule (
529 union acpi_operand_object *obj_desc,
530 acpi_integer mask,
531 acpi_integer field_value,
532 u32 field_datum_byte_offset)
533{
534 acpi_status status = AE_OK;
535 acpi_integer merged_value;
536 acpi_integer current_value;
537
538
539 ACPI_FUNCTION_TRACE_U32 ("ex_write_with_update_rule", mask);
540
541
542 /* Start with the new bits */
543
544 merged_value = field_value;
545
546 /* If the mask is all ones, we don't need to worry about the update rule */
547
548 if (mask != ACPI_INTEGER_MAX) {
549 /* Decode the update rule */
550
551 switch (obj_desc->common_field.field_flags & AML_FIELD_UPDATE_RULE_MASK) {
552 case AML_FIELD_UPDATE_PRESERVE:
553 /*
554 * Check if update rule needs to be applied (not if mask is all
555 * ones) The left shift drops the bits we want to ignore.
556 */
557 if ((~mask << (ACPI_MUL_8 (sizeof (mask)) -
558 ACPI_MUL_8 (obj_desc->common_field.access_byte_width))) != 0) {
559 /*
560 * Read the current contents of the byte/word/dword containing
561 * the field, and merge with the new field value.
562 */
563 status = acpi_ex_field_datum_io (obj_desc, field_datum_byte_offset,
564 &current_value, ACPI_READ);
565 if (ACPI_FAILURE (status)) {
566 return_ACPI_STATUS (status);
567 }
568
569 merged_value |= (current_value & ~mask);
570 }
571 break;
572
573 case AML_FIELD_UPDATE_WRITE_AS_ONES:
574
575 /* Set positions outside the field to all ones */
576
577 merged_value |= ~mask;
578 break;
579
580 case AML_FIELD_UPDATE_WRITE_AS_ZEROS:
581
582 /* Set positions outside the field to all zeros */
583
584 merged_value &= mask;
585 break;
586
587 default:
588
589 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
590 "write_with_update_rule: Unknown update_rule setting: %X\n",
591 (obj_desc->common_field.field_flags & AML_FIELD_UPDATE_RULE_MASK)));
592 return_ACPI_STATUS (AE_AML_OPERAND_VALUE);
593 }
594 }
595
596 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
597 "Mask %8.8X%8.8X, datum_offset %X, Width %X, Value %8.8X%8.8X, merged_value %8.8X%8.8X\n",
598 ACPI_FORMAT_UINT64 (mask),
599 field_datum_byte_offset,
600 obj_desc->common_field.access_byte_width,
601 ACPI_FORMAT_UINT64 (field_value),
602 ACPI_FORMAT_UINT64 (merged_value)));
603
604 /* Write the merged value */
605
606 status = acpi_ex_field_datum_io (obj_desc, field_datum_byte_offset,
607 &merged_value, ACPI_WRITE);
608
609 return_ACPI_STATUS (status);
610}
611
612
613/*******************************************************************************
614 *
615 * FUNCTION: acpi_ex_extract_from_field
616 *
617 * PARAMETERS: obj_desc - Field to be read
618 * Buffer - Where to store the field data
619 * buffer_length - Length of Buffer
620 *
621 * RETURN: Status
622 *
623 * DESCRIPTION: Retrieve the current value of the given field
624 *
625 ******************************************************************************/
626
627acpi_status
628acpi_ex_extract_from_field (
629 union acpi_operand_object *obj_desc,
630 void *buffer,
631 u32 buffer_length)
632{
633 acpi_status status;
634 acpi_integer raw_datum;
635 acpi_integer merged_datum;
636 u32 field_offset = 0;
637 u32 buffer_offset = 0;
638 u32 buffer_tail_bits;
639 u32 datum_count;
640 u32 field_datum_count;
641 u32 i;
642
643
644 ACPI_FUNCTION_TRACE ("ex_extract_from_field");
645
646
647 /* Validate target buffer and clear it */
648
649 if (buffer_length < ACPI_ROUND_BITS_UP_TO_BYTES (
650 obj_desc->common_field.bit_length)) {
651 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
652 "Field size %X (bits) is too large for buffer (%X)\n",
653 obj_desc->common_field.bit_length, buffer_length));
654
655 return_ACPI_STATUS (AE_BUFFER_OVERFLOW);
656 }
657 ACPI_MEMSET (buffer, 0, buffer_length);
658
659 /* Compute the number of datums (access width data items) */
660
661 datum_count = ACPI_ROUND_UP_TO (
662 obj_desc->common_field.bit_length,
663 obj_desc->common_field.access_bit_width);
664 field_datum_count = ACPI_ROUND_UP_TO (
665 obj_desc->common_field.bit_length +
666 obj_desc->common_field.start_field_bit_offset,
667 obj_desc->common_field.access_bit_width);
668
669 /* Priming read from the field */
670
671 status = acpi_ex_field_datum_io (obj_desc, field_offset, &raw_datum, ACPI_READ);
672 if (ACPI_FAILURE (status)) {
673 return_ACPI_STATUS (status);
674 }
675 merged_datum = raw_datum >> obj_desc->common_field.start_field_bit_offset;
676
677 /* Read the rest of the field */
678
679 for (i = 1; i < field_datum_count; i++) {
680 /* Get next input datum from the field */
681
682 field_offset += obj_desc->common_field.access_byte_width;
683 status = acpi_ex_field_datum_io (obj_desc, field_offset,
684 &raw_datum, ACPI_READ);
685 if (ACPI_FAILURE (status)) {
686 return_ACPI_STATUS (status);
687 }
688
689 /* Merge with previous datum if necessary */
690
691 merged_datum |= raw_datum <<
692 (obj_desc->common_field.access_bit_width - obj_desc->common_field.start_field_bit_offset);
693
694 if (i == datum_count) {
695 break;
696 }
697
698 /* Write merged datum to target buffer */
699
700 ACPI_MEMCPY (((char *) buffer) + buffer_offset, &merged_datum,
701 ACPI_MIN(obj_desc->common_field.access_byte_width,
702 buffer_length - buffer_offset));
703
704 buffer_offset += obj_desc->common_field.access_byte_width;
705 merged_datum = raw_datum >> obj_desc->common_field.start_field_bit_offset;
706 }
707
708 /* Mask off any extra bits in the last datum */
709
710 buffer_tail_bits = obj_desc->common_field.bit_length % obj_desc->common_field.access_bit_width;
711 if (buffer_tail_bits) {
712 merged_datum &= ACPI_MASK_BITS_ABOVE (buffer_tail_bits);
713 }
714
715 /* Write the last datum to the buffer */
716
717 ACPI_MEMCPY (((char *) buffer) + buffer_offset, &merged_datum,
718 ACPI_MIN(obj_desc->common_field.access_byte_width,
719 buffer_length - buffer_offset));
720
721 return_ACPI_STATUS (AE_OK);
722}
723
724
725/*******************************************************************************
726 *
727 * FUNCTION: acpi_ex_insert_into_field
728 *
729 * PARAMETERS: obj_desc - Field to be written
730 * Buffer - Data to be written
731 * buffer_length - Length of Buffer
732 *
733 * RETURN: Status
734 *
735 * DESCRIPTION: Store the Buffer contents into the given field
736 *
737 ******************************************************************************/
738
739acpi_status
740acpi_ex_insert_into_field (
741 union acpi_operand_object *obj_desc,
742 void *buffer,
743 u32 buffer_length)
744{
745 acpi_status status;
746 acpi_integer mask;
747 acpi_integer merged_datum;
748 acpi_integer raw_datum = 0;
749 u32 field_offset = 0;
750 u32 buffer_offset = 0;
751 u32 buffer_tail_bits;
752 u32 datum_count;
753 u32 field_datum_count;
754 u32 i;
755
756
757 ACPI_FUNCTION_TRACE ("ex_insert_into_field");
758
759
760 /* Validate input buffer */
761
762 if (buffer_length < ACPI_ROUND_BITS_UP_TO_BYTES (
763 obj_desc->common_field.bit_length)) {
764 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
765 "Field size %X (bits) is too large for buffer (%X)\n",
766 obj_desc->common_field.bit_length, buffer_length));
767
768 return_ACPI_STATUS (AE_BUFFER_OVERFLOW);
769 }
770
771 /* Compute the number of datums (access width data items) */
772
773 mask = ACPI_MASK_BITS_BELOW (obj_desc->common_field.start_field_bit_offset);
774 datum_count = ACPI_ROUND_UP_TO (obj_desc->common_field.bit_length,
775 obj_desc->common_field.access_bit_width);
776 field_datum_count = ACPI_ROUND_UP_TO (obj_desc->common_field.bit_length +
777 obj_desc->common_field.start_field_bit_offset,
778 obj_desc->common_field.access_bit_width);
779
780 /* Get initial Datum from the input buffer */
781
782 ACPI_MEMCPY (&raw_datum, buffer,
783 ACPI_MIN(obj_desc->common_field.access_byte_width,
784 buffer_length - buffer_offset));
785
786 merged_datum = raw_datum << obj_desc->common_field.start_field_bit_offset;
787
788 /* Write the entire field */
789
790 for (i = 1; i < field_datum_count; i++) {
791 /* Write merged datum to the target field */
792
793 merged_datum &= mask;
794 status = acpi_ex_write_with_update_rule (obj_desc, mask, merged_datum, field_offset);
795 if (ACPI_FAILURE (status)) {
796 return_ACPI_STATUS (status);
797 }
798
799 /* Start new output datum by merging with previous input datum */
800
801 field_offset += obj_desc->common_field.access_byte_width;
802 merged_datum = raw_datum >>
803 (obj_desc->common_field.access_bit_width - obj_desc->common_field.start_field_bit_offset);
804 mask = ACPI_INTEGER_MAX;
805
806 if (i == datum_count) {
807 break;
808 }
809
810 /* Get the next input datum from the buffer */
811
812 buffer_offset += obj_desc->common_field.access_byte_width;
813 ACPI_MEMCPY (&raw_datum, ((char *) buffer) + buffer_offset,
814 ACPI_MIN(obj_desc->common_field.access_byte_width,
815 buffer_length - buffer_offset));
816 merged_datum |= raw_datum << obj_desc->common_field.start_field_bit_offset;
817 }
818
819 /* Mask off any extra bits in the last datum */
820
821 buffer_tail_bits = (obj_desc->common_field.bit_length +
822 obj_desc->common_field.start_field_bit_offset) % obj_desc->common_field.access_bit_width;
823 if (buffer_tail_bits) {
824 mask &= ACPI_MASK_BITS_ABOVE (buffer_tail_bits);
825 }
826
827 /* Write the last datum to the field */
828
829 merged_datum &= mask;
830 status = acpi_ex_write_with_update_rule (obj_desc, mask, merged_datum, field_offset);
831
832 return_ACPI_STATUS (status);
833}
834
835
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-18 01:28:27 -0500