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team: fix memory leaks
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / acpi / acpica / exfldio.c
1 /******************************************************************************
2 *
3 * Module Name: exfldio - Aml Field I/O
4 *
5 *****************************************************************************/
6
7 /*
8 * Copyright (C) 2000 - 2013, 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 #include <acpi/acpi.h>
45 #include "accommon.h"
46 #include "acinterp.h"
47 #include "amlcode.h"
48 #include "acevents.h"
49 #include "acdispat.h"
50
51 #define _COMPONENT ACPI_EXECUTER
52 ACPI_MODULE_NAME("exfldio")
53
54 /* Local prototypes */
55 static acpi_status
56 acpi_ex_field_datum_io(union acpi_operand_object *obj_desc,
57 u32 field_datum_byte_offset, u64 *value, u32 read_write);
58
59 static u8
60 acpi_ex_register_overflow(union acpi_operand_object *obj_desc, u64 value);
61
62 static acpi_status
63 acpi_ex_setup_region(union acpi_operand_object *obj_desc,
64 u32 field_datum_byte_offset);
65
66 /*******************************************************************************
67 *
68 * FUNCTION: acpi_ex_setup_region
69 *
70 * PARAMETERS: obj_desc - Field to be read or written
71 * field_datum_byte_offset - Byte offset of this datum within the
72 * parent field
73 *
74 * RETURN: Status
75 *
76 * DESCRIPTION: Common processing for acpi_ex_extract_from_field and
77 * acpi_ex_insert_into_field. Initialize the Region if necessary and
78 * validate the request.
79 *
80 ******************************************************************************/
81
82 static acpi_status
83 acpi_ex_setup_region(union acpi_operand_object *obj_desc,
84 u32 field_datum_byte_offset)
85 {
86 acpi_status status = AE_OK;
87 union acpi_operand_object *rgn_desc;
88 u8 space_id;
89
90 ACPI_FUNCTION_TRACE_U32(ex_setup_region, field_datum_byte_offset);
91
92 rgn_desc = obj_desc->common_field.region_obj;
93
94 /* We must have a valid region */
95
96 if (rgn_desc->common.type != ACPI_TYPE_REGION) {
97 ACPI_ERROR((AE_INFO, "Needed Region, found type 0x%X (%s)",
98 rgn_desc->common.type,
99 acpi_ut_get_object_type_name(rgn_desc)));
100
101 return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
102 }
103
104 space_id = rgn_desc->region.space_id;
105
106 /* Validate the Space ID */
107
108 if (!acpi_is_valid_space_id(space_id)) {
109 ACPI_ERROR((AE_INFO,
110 "Invalid/unknown Address Space ID: 0x%2.2X",
111 space_id));
112 return_ACPI_STATUS(AE_AML_INVALID_SPACE_ID);
113 }
114
115 /*
116 * If the Region Address and Length have not been previously evaluated,
117 * evaluate them now and save the results.
118 */
119 if (!(rgn_desc->common.flags & AOPOBJ_DATA_VALID)) {
120 status = acpi_ds_get_region_arguments(rgn_desc);
121 if (ACPI_FAILURE(status)) {
122 return_ACPI_STATUS(status);
123 }
124 }
125
126 /* Exit if Address/Length have been disallowed by the host OS */
127
128 if (rgn_desc->common.flags & AOPOBJ_INVALID) {
129 return_ACPI_STATUS(AE_AML_ILLEGAL_ADDRESS);
130 }
131
132 /*
133 * Exit now for SMBus, GSBus or IPMI address space, it has a non-linear
134 * address space and the request cannot be directly validated
135 */
136 if (space_id == ACPI_ADR_SPACE_SMBUS ||
137 space_id == ACPI_ADR_SPACE_GSBUS ||
138 space_id == ACPI_ADR_SPACE_IPMI) {
139
140 /* SMBus or IPMI has a non-linear address space */
141
142 return_ACPI_STATUS(AE_OK);
143 }
144 #ifdef ACPI_UNDER_DEVELOPMENT
145 /*
146 * If the Field access is any_acc, we can now compute the optimal
147 * access (because we know know the length of the parent region)
148 */
149 if (!(obj_desc->common.flags & AOPOBJ_DATA_VALID)) {
150 if (ACPI_FAILURE(status)) {
151 return_ACPI_STATUS(status);
152 }
153 }
154 #endif
155
156 /*
157 * Validate the request. The entire request from the byte offset for a
158 * length of one field datum (access width) must fit within the region.
159 * (Region length is specified in bytes)
160 */
161 if (rgn_desc->region.length <
162 (obj_desc->common_field.base_byte_offset + field_datum_byte_offset +
163 obj_desc->common_field.access_byte_width)) {
164 if (acpi_gbl_enable_interpreter_slack) {
165 /*
166 * Slack mode only: We will go ahead and allow access to this
167 * field if it is within the region length rounded up to the next
168 * access width boundary. acpi_size cast for 64-bit compile.
169 */
170 if (ACPI_ROUND_UP(rgn_desc->region.length,
171 obj_desc->common_field.
172 access_byte_width) >=
173 ((acpi_size) obj_desc->common_field.
174 base_byte_offset +
175 obj_desc->common_field.access_byte_width +
176 field_datum_byte_offset)) {
177 return_ACPI_STATUS(AE_OK);
178 }
179 }
180
181 if (rgn_desc->region.length <
182 obj_desc->common_field.access_byte_width) {
183 /*
184 * This is the case where the access_type (acc_word, etc.) is wider
185 * than the region itself. For example, a region of length one
186 * byte, and a field with Dword access specified.
187 */
188 ACPI_ERROR((AE_INFO,
189 "Field [%4.4s] access width (%u bytes) too large for region [%4.4s] (length %u)",
190 acpi_ut_get_node_name(obj_desc->
191 common_field.node),
192 obj_desc->common_field.access_byte_width,
193 acpi_ut_get_node_name(rgn_desc->region.
194 node),
195 rgn_desc->region.length));
196 }
197
198 /*
199 * Offset rounded up to next multiple of field width
200 * exceeds region length, indicate an error
201 */
202 ACPI_ERROR((AE_INFO,
203 "Field [%4.4s] Base+Offset+Width %u+%u+%u is beyond end of region [%4.4s] (length %u)",
204 acpi_ut_get_node_name(obj_desc->common_field.node),
205 obj_desc->common_field.base_byte_offset,
206 field_datum_byte_offset,
207 obj_desc->common_field.access_byte_width,
208 acpi_ut_get_node_name(rgn_desc->region.node),
209 rgn_desc->region.length));
210
211 return_ACPI_STATUS(AE_AML_REGION_LIMIT);
212 }
213
214 return_ACPI_STATUS(AE_OK);
215 }
216
217 /*******************************************************************************
218 *
219 * FUNCTION: acpi_ex_access_region
220 *
221 * PARAMETERS: obj_desc - Field to be read
222 * field_datum_byte_offset - Byte offset of this datum within the
223 * parent field
224 * value - Where to store value (must at least
225 * 64 bits)
226 * function - Read or Write flag plus other region-
227 * dependent flags
228 *
229 * RETURN: Status
230 *
231 * DESCRIPTION: Read or Write a single field datum to an Operation Region.
232 *
233 ******************************************************************************/
234
235 acpi_status
236 acpi_ex_access_region(union acpi_operand_object *obj_desc,
237 u32 field_datum_byte_offset, u64 *value, u32 function)
238 {
239 acpi_status status;
240 union acpi_operand_object *rgn_desc;
241 u32 region_offset;
242
243 ACPI_FUNCTION_TRACE(ex_access_region);
244
245 /*
246 * Ensure that the region operands are fully evaluated and verify
247 * the validity of the request
248 */
249 status = acpi_ex_setup_region(obj_desc, field_datum_byte_offset);
250 if (ACPI_FAILURE(status)) {
251 return_ACPI_STATUS(status);
252 }
253
254 /*
255 * The physical address of this field datum is:
256 *
257 * 1) The base of the region, plus
258 * 2) The base offset of the field, plus
259 * 3) The current offset into the field
260 */
261 rgn_desc = obj_desc->common_field.region_obj;
262 region_offset =
263 obj_desc->common_field.base_byte_offset + field_datum_byte_offset;
264
265 if ((function & ACPI_IO_MASK) == ACPI_READ) {
266 ACPI_DEBUG_PRINT((ACPI_DB_BFIELD, "[READ]"));
267 } else {
268 ACPI_DEBUG_PRINT((ACPI_DB_BFIELD, "[WRITE]"));
269 }
270
271 ACPI_DEBUG_PRINT_RAW((ACPI_DB_BFIELD,
272 " Region [%s:%X], Width %X, ByteBase %X, Offset %X at %8.8X%8.8X\n",
273 acpi_ut_get_region_name(rgn_desc->region.
274 space_id),
275 rgn_desc->region.space_id,
276 obj_desc->common_field.access_byte_width,
277 obj_desc->common_field.base_byte_offset,
278 field_datum_byte_offset,
279 ACPI_FORMAT_UINT64(rgn_desc->region.address +
280 region_offset)));
281
282 /* Invoke the appropriate address_space/op_region handler */
283
284 status = acpi_ev_address_space_dispatch(rgn_desc, obj_desc,
285 function, region_offset,
286 ACPI_MUL_8(obj_desc->
287 common_field.
288 access_byte_width),
289 value);
290
291 if (ACPI_FAILURE(status)) {
292 if (status == AE_NOT_IMPLEMENTED) {
293 ACPI_ERROR((AE_INFO,
294 "Region %s (ID=%u) not implemented",
295 acpi_ut_get_region_name(rgn_desc->region.
296 space_id),
297 rgn_desc->region.space_id));
298 } else if (status == AE_NOT_EXIST) {
299 ACPI_ERROR((AE_INFO,
300 "Region %s (ID=%u) has no handler",
301 acpi_ut_get_region_name(rgn_desc->region.
302 space_id),
303 rgn_desc->region.space_id));
304 }
305 }
306
307 return_ACPI_STATUS(status);
308 }
309
310 /*******************************************************************************
311 *
312 * FUNCTION: acpi_ex_register_overflow
313 *
314 * PARAMETERS: obj_desc - Register(Field) to be written
315 * value - Value to be stored
316 *
317 * RETURN: TRUE if value overflows the field, FALSE otherwise
318 *
319 * DESCRIPTION: Check if a value is out of range of the field being written.
320 * Used to check if the values written to Index and Bank registers
321 * are out of range. Normally, the value is simply truncated
322 * to fit the field, but this case is most likely a serious
323 * coding error in the ASL.
324 *
325 ******************************************************************************/
326
327 static u8
328 acpi_ex_register_overflow(union acpi_operand_object *obj_desc, u64 value)
329 {
330
331 if (obj_desc->common_field.bit_length >= ACPI_INTEGER_BIT_SIZE) {
332 /*
333 * The field is large enough to hold the maximum integer, so we can
334 * never overflow it.
335 */
336 return (FALSE);
337 }
338
339 if (value >= ((u64) 1 << obj_desc->common_field.bit_length)) {
340 /*
341 * The Value is larger than the maximum value that can fit into
342 * the register.
343 */
344 ACPI_ERROR((AE_INFO,
345 "Index value 0x%8.8X%8.8X overflows field width 0x%X",
346 ACPI_FORMAT_UINT64(value),
347 obj_desc->common_field.bit_length));
348
349 return (TRUE);
350 }
351
352 /* The Value will fit into the field with no truncation */
353
354 return (FALSE);
355 }
356
357 /*******************************************************************************
358 *
359 * FUNCTION: acpi_ex_field_datum_io
360 *
361 * PARAMETERS: obj_desc - Field to be read
362 * field_datum_byte_offset - Byte offset of this datum within the
363 * parent field
364 * value - Where to store value (must be 64 bits)
365 * read_write - Read or Write flag
366 *
367 * RETURN: Status
368 *
369 * DESCRIPTION: Read or Write a single datum of a field. The field_type is
370 * demultiplexed here to handle the different types of fields
371 * (buffer_field, region_field, index_field, bank_field)
372 *
373 ******************************************************************************/
374
375 static acpi_status
376 acpi_ex_field_datum_io(union acpi_operand_object *obj_desc,
377 u32 field_datum_byte_offset, u64 *value, u32 read_write)
378 {
379 acpi_status status;
380 u64 local_value;
381
382 ACPI_FUNCTION_TRACE_U32(ex_field_datum_io, field_datum_byte_offset);
383
384 if (read_write == ACPI_READ) {
385 if (!value) {
386 local_value = 0;
387
388 /* To support reads without saving return value */
389 value = &local_value;
390 }
391
392 /* Clear the entire return buffer first, [Very Important!] */
393
394 *value = 0;
395 }
396
397 /*
398 * The four types of fields are:
399 *
400 * buffer_field - Read/write from/to a Buffer
401 * region_field - Read/write from/to a Operation Region.
402 * bank_field - Write to a Bank Register, then read/write from/to an
403 * operation_region
404 * index_field - Write to an Index Register, then read/write from/to a
405 * Data Register
406 */
407 switch (obj_desc->common.type) {
408 case ACPI_TYPE_BUFFER_FIELD:
409 /*
410 * If the buffer_field arguments have not been previously evaluated,
411 * evaluate them now and save the results.
412 */
413 if (!(obj_desc->common.flags & AOPOBJ_DATA_VALID)) {
414 status = acpi_ds_get_buffer_field_arguments(obj_desc);
415 if (ACPI_FAILURE(status)) {
416 return_ACPI_STATUS(status);
417 }
418 }
419
420 if (read_write == ACPI_READ) {
421 /*
422 * Copy the data from the source buffer.
423 * Length is the field width in bytes.
424 */
425 ACPI_MEMCPY(value,
426 (obj_desc->buffer_field.buffer_obj)->buffer.
427 pointer +
428 obj_desc->buffer_field.base_byte_offset +
429 field_datum_byte_offset,
430 obj_desc->common_field.access_byte_width);
431 } else {
432 /*
433 * Copy the data to the target buffer.
434 * Length is the field width in bytes.
435 */
436 ACPI_MEMCPY((obj_desc->buffer_field.buffer_obj)->buffer.
437 pointer +
438 obj_desc->buffer_field.base_byte_offset +
439 field_datum_byte_offset, value,
440 obj_desc->common_field.access_byte_width);
441 }
442
443 status = AE_OK;
444 break;
445
446 case ACPI_TYPE_LOCAL_BANK_FIELD:
447
448 /*
449 * Ensure that the bank_value is not beyond the capacity of
450 * the register
451 */
452 if (acpi_ex_register_overflow(obj_desc->bank_field.bank_obj,
453 (u64) obj_desc->bank_field.
454 value)) {
455 return_ACPI_STATUS(AE_AML_REGISTER_LIMIT);
456 }
457
458 /*
459 * For bank_fields, we must write the bank_value to the bank_register
460 * (itself a region_field) before we can access the data.
461 */
462 status =
463 acpi_ex_insert_into_field(obj_desc->bank_field.bank_obj,
464 &obj_desc->bank_field.value,
465 sizeof(obj_desc->bank_field.
466 value));
467 if (ACPI_FAILURE(status)) {
468 return_ACPI_STATUS(status);
469 }
470
471 /*
472 * Now that the Bank has been selected, fall through to the
473 * region_field case and write the datum to the Operation Region
474 */
475
476 /*lint -fallthrough */
477
478 case ACPI_TYPE_LOCAL_REGION_FIELD:
479 /*
480 * For simple region_fields, we just directly access the owning
481 * Operation Region.
482 */
483 status =
484 acpi_ex_access_region(obj_desc, field_datum_byte_offset,
485 value, read_write);
486 break;
487
488 case ACPI_TYPE_LOCAL_INDEX_FIELD:
489
490 /*
491 * Ensure that the index_value is not beyond the capacity of
492 * the register
493 */
494 if (acpi_ex_register_overflow(obj_desc->index_field.index_obj,
495 (u64) obj_desc->index_field.
496 value)) {
497 return_ACPI_STATUS(AE_AML_REGISTER_LIMIT);
498 }
499
500 /* Write the index value to the index_register (itself a region_field) */
501
502 field_datum_byte_offset += obj_desc->index_field.value;
503
504 ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
505 "Write to Index Register: Value %8.8X\n",
506 field_datum_byte_offset));
507
508 status =
509 acpi_ex_insert_into_field(obj_desc->index_field.index_obj,
510 &field_datum_byte_offset,
511 sizeof(field_datum_byte_offset));
512 if (ACPI_FAILURE(status)) {
513 return_ACPI_STATUS(status);
514 }
515
516 if (read_write == ACPI_READ) {
517
518 /* Read the datum from the data_register */
519
520 ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
521 "Read from Data Register\n"));
522
523 status =
524 acpi_ex_extract_from_field(obj_desc->index_field.
525 data_obj, value,
526 sizeof(u64));
527 } else {
528 /* Write the datum to the data_register */
529
530 ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
531 "Write to Data Register: Value %8.8X%8.8X\n",
532 ACPI_FORMAT_UINT64(*value)));
533
534 status =
535 acpi_ex_insert_into_field(obj_desc->index_field.
536 data_obj, value,
537 sizeof(u64));
538 }
539 break;
540
541 default:
542
543 ACPI_ERROR((AE_INFO, "Wrong object type in field I/O %u",
544 obj_desc->common.type));
545 status = AE_AML_INTERNAL;
546 break;
547 }
548
549 if (ACPI_SUCCESS(status)) {
550 if (read_write == ACPI_READ) {
551 ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
552 "Value Read %8.8X%8.8X, Width %u\n",
553 ACPI_FORMAT_UINT64(*value),
554 obj_desc->common_field.
555 access_byte_width));
556 } else {
557 ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
558 "Value Written %8.8X%8.8X, Width %u\n",
559 ACPI_FORMAT_UINT64(*value),
560 obj_desc->common_field.
561 access_byte_width));
562 }
563 }
564
565 return_ACPI_STATUS(status);
566 }
567
568 /*******************************************************************************
569 *
570 * FUNCTION: acpi_ex_write_with_update_rule
571 *
572 * PARAMETERS: obj_desc - Field to be written
573 * mask - bitmask within field datum
574 * field_value - Value to write
575 * field_datum_byte_offset - Offset of datum within field
576 *
577 * RETURN: Status
578 *
579 * DESCRIPTION: Apply the field update rule to a field write
580 *
581 ******************************************************************************/
582
583 acpi_status
584 acpi_ex_write_with_update_rule(union acpi_operand_object *obj_desc,
585 u64 mask,
586 u64 field_value, u32 field_datum_byte_offset)
587 {
588 acpi_status status = AE_OK;
589 u64 merged_value;
590 u64 current_value;
591
592 ACPI_FUNCTION_TRACE_U32(ex_write_with_update_rule, mask);
593
594 /* Start with the new bits */
595
596 merged_value = field_value;
597
598 /* If the mask is all ones, we don't need to worry about the update rule */
599
600 if (mask != ACPI_UINT64_MAX) {
601
602 /* Decode the update rule */
603
604 switch (obj_desc->common_field.
605 field_flags & AML_FIELD_UPDATE_RULE_MASK) {
606 case AML_FIELD_UPDATE_PRESERVE:
607 /*
608 * Check if update rule needs to be applied (not if mask is all
609 * ones) The left shift drops the bits we want to ignore.
610 */
611 if ((~mask << (ACPI_MUL_8(sizeof(mask)) -
612 ACPI_MUL_8(obj_desc->common_field.
613 access_byte_width))) != 0) {
614 /*
615 * Read the current contents of the byte/word/dword containing
616 * the field, and merge with the new field value.
617 */
618 status =
619 acpi_ex_field_datum_io(obj_desc,
620 field_datum_byte_offset,
621 &current_value,
622 ACPI_READ);
623 if (ACPI_FAILURE(status)) {
624 return_ACPI_STATUS(status);
625 }
626
627 merged_value |= (current_value & ~mask);
628 }
629 break;
630
631 case AML_FIELD_UPDATE_WRITE_AS_ONES:
632
633 /* Set positions outside the field to all ones */
634
635 merged_value |= ~mask;
636 break;
637
638 case AML_FIELD_UPDATE_WRITE_AS_ZEROS:
639
640 /* Set positions outside the field to all zeros */
641
642 merged_value &= mask;
643 break;
644
645 default:
646
647 ACPI_ERROR((AE_INFO,
648 "Unknown UpdateRule value: 0x%X",
649 (obj_desc->common_field.
650 field_flags &
651 AML_FIELD_UPDATE_RULE_MASK)));
652 return_ACPI_STATUS(AE_AML_OPERAND_VALUE);
653 }
654 }
655
656 ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
657 "Mask %8.8X%8.8X, DatumOffset %X, Width %X, Value %8.8X%8.8X, MergedValue %8.8X%8.8X\n",
658 ACPI_FORMAT_UINT64(mask),
659 field_datum_byte_offset,
660 obj_desc->common_field.access_byte_width,
661 ACPI_FORMAT_UINT64(field_value),
662 ACPI_FORMAT_UINT64(merged_value)));
663
664 /* Write the merged value */
665
666 status = acpi_ex_field_datum_io(obj_desc, field_datum_byte_offset,
667 &merged_value, ACPI_WRITE);
668
669 return_ACPI_STATUS(status);
670 }
671
672 /*******************************************************************************
673 *
674 * FUNCTION: acpi_ex_extract_from_field
675 *
676 * PARAMETERS: obj_desc - Field to be read
677 * buffer - Where to store the field data
678 * buffer_length - Length of Buffer
679 *
680 * RETURN: Status
681 *
682 * DESCRIPTION: Retrieve the current value of the given field
683 *
684 ******************************************************************************/
685
686 acpi_status
687 acpi_ex_extract_from_field(union acpi_operand_object *obj_desc,
688 void *buffer, u32 buffer_length)
689 {
690 acpi_status status;
691 u64 raw_datum;
692 u64 merged_datum;
693 u32 field_offset = 0;
694 u32 buffer_offset = 0;
695 u32 buffer_tail_bits;
696 u32 datum_count;
697 u32 field_datum_count;
698 u32 access_bit_width;
699 u32 i;
700
701 ACPI_FUNCTION_TRACE(ex_extract_from_field);
702
703 /* Validate target buffer and clear it */
704
705 if (buffer_length <
706 ACPI_ROUND_BITS_UP_TO_BYTES(obj_desc->common_field.bit_length)) {
707 ACPI_ERROR((AE_INFO,
708 "Field size %u (bits) is too large for buffer (%u)",
709 obj_desc->common_field.bit_length, buffer_length));
710
711 return_ACPI_STATUS(AE_BUFFER_OVERFLOW);
712 }
713
714 ACPI_MEMSET(buffer, 0, buffer_length);
715 access_bit_width = ACPI_MUL_8(obj_desc->common_field.access_byte_width);
716
717 /* Handle the simple case here */
718
719 if ((obj_desc->common_field.start_field_bit_offset == 0) &&
720 (obj_desc->common_field.bit_length == access_bit_width)) {
721 if (buffer_length >= sizeof(u64)) {
722 status =
723 acpi_ex_field_datum_io(obj_desc, 0, buffer,
724 ACPI_READ);
725 } else {
726 /* Use raw_datum (u64) to handle buffers < 64 bits */
727
728 status =
729 acpi_ex_field_datum_io(obj_desc, 0, &raw_datum,
730 ACPI_READ);
731 ACPI_MEMCPY(buffer, &raw_datum, buffer_length);
732 }
733
734 return_ACPI_STATUS(status);
735 }
736
737 /* TBD: Move to common setup code */
738
739 /* Field algorithm is limited to sizeof(u64), truncate if needed */
740
741 if (obj_desc->common_field.access_byte_width > sizeof(u64)) {
742 obj_desc->common_field.access_byte_width = sizeof(u64);
743 access_bit_width = sizeof(u64) * 8;
744 }
745
746 /* Compute the number of datums (access width data items) */
747
748 datum_count =
749 ACPI_ROUND_UP_TO(obj_desc->common_field.bit_length,
750 access_bit_width);
751
752 field_datum_count = ACPI_ROUND_UP_TO(obj_desc->common_field.bit_length +
753 obj_desc->common_field.
754 start_field_bit_offset,
755 access_bit_width);
756
757 /* Priming read from the field */
758
759 status =
760 acpi_ex_field_datum_io(obj_desc, field_offset, &raw_datum,
761 ACPI_READ);
762 if (ACPI_FAILURE(status)) {
763 return_ACPI_STATUS(status);
764 }
765 merged_datum =
766 raw_datum >> obj_desc->common_field.start_field_bit_offset;
767
768 /* Read the rest of the field */
769
770 for (i = 1; i < field_datum_count; i++) {
771
772 /* Get next input datum from the field */
773
774 field_offset += obj_desc->common_field.access_byte_width;
775 status = acpi_ex_field_datum_io(obj_desc, field_offset,
776 &raw_datum, ACPI_READ);
777 if (ACPI_FAILURE(status)) {
778 return_ACPI_STATUS(status);
779 }
780
781 /*
782 * Merge with previous datum if necessary.
783 *
784 * Note: Before the shift, check if the shift value will be larger than
785 * the integer size. If so, there is no need to perform the operation.
786 * This avoids the differences in behavior between different compilers
787 * concerning shift values larger than the target data width.
788 */
789 if (access_bit_width -
790 obj_desc->common_field.start_field_bit_offset <
791 ACPI_INTEGER_BIT_SIZE) {
792 merged_datum |=
793 raw_datum << (access_bit_width -
794 obj_desc->common_field.
795 start_field_bit_offset);
796 }
797
798 if (i == datum_count) {
799 break;
800 }
801
802 /* Write merged datum to target buffer */
803
804 ACPI_MEMCPY(((char *)buffer) + buffer_offset, &merged_datum,
805 ACPI_MIN(obj_desc->common_field.access_byte_width,
806 buffer_length - buffer_offset));
807
808 buffer_offset += obj_desc->common_field.access_byte_width;
809 merged_datum =
810 raw_datum >> obj_desc->common_field.start_field_bit_offset;
811 }
812
813 /* Mask off any extra bits in the last datum */
814
815 buffer_tail_bits = obj_desc->common_field.bit_length % access_bit_width;
816 if (buffer_tail_bits) {
817 merged_datum &= ACPI_MASK_BITS_ABOVE(buffer_tail_bits);
818 }
819
820 /* Write the last datum to the buffer */
821
822 ACPI_MEMCPY(((char *)buffer) + buffer_offset, &merged_datum,
823 ACPI_MIN(obj_desc->common_field.access_byte_width,
824 buffer_length - buffer_offset));
825
826 return_ACPI_STATUS(AE_OK);
827 }
828
829 /*******************************************************************************
830 *
831 * FUNCTION: acpi_ex_insert_into_field
832 *
833 * PARAMETERS: obj_desc - Field to be written
834 * buffer - Data to be written
835 * buffer_length - Length of Buffer
836 *
837 * RETURN: Status
838 *
839 * DESCRIPTION: Store the Buffer contents into the given field
840 *
841 ******************************************************************************/
842
843 acpi_status
844 acpi_ex_insert_into_field(union acpi_operand_object *obj_desc,
845 void *buffer, u32 buffer_length)
846 {
847 void *new_buffer;
848 acpi_status status;
849 u64 mask;
850 u64 width_mask;
851 u64 merged_datum;
852 u64 raw_datum = 0;
853 u32 field_offset = 0;
854 u32 buffer_offset = 0;
855 u32 buffer_tail_bits;
856 u32 datum_count;
857 u32 field_datum_count;
858 u32 access_bit_width;
859 u32 required_length;
860 u32 i;
861
862 ACPI_FUNCTION_TRACE(ex_insert_into_field);
863
864 /* Validate input buffer */
865
866 new_buffer = NULL;
867 required_length =
868 ACPI_ROUND_BITS_UP_TO_BYTES(obj_desc->common_field.bit_length);
869 /*
870 * We must have a buffer that is at least as long as the field
871 * we are writing to. This is because individual fields are
872 * indivisible and partial writes are not supported -- as per
873 * the ACPI specification.
874 */
875 if (buffer_length < required_length) {
876
877 /* We need to create a new buffer */
878
879 new_buffer = ACPI_ALLOCATE_ZEROED(required_length);
880 if (!new_buffer) {
881 return_ACPI_STATUS(AE_NO_MEMORY);
882 }
883
884 /*
885 * Copy the original data to the new buffer, starting
886 * at Byte zero. All unused (upper) bytes of the
887 * buffer will be 0.
888 */
889 ACPI_MEMCPY((char *)new_buffer, (char *)buffer, buffer_length);
890 buffer = new_buffer;
891 buffer_length = required_length;
892 }
893
894 /* TBD: Move to common setup code */
895
896 /* Algo is limited to sizeof(u64), so cut the access_byte_width */
897 if (obj_desc->common_field.access_byte_width > sizeof(u64)) {
898 obj_desc->common_field.access_byte_width = sizeof(u64);
899 }
900
901 access_bit_width = ACPI_MUL_8(obj_desc->common_field.access_byte_width);
902
903 /*
904 * Create the bitmasks used for bit insertion.
905 * Note: This if/else is used to bypass compiler differences with the
906 * shift operator
907 */
908 if (access_bit_width == ACPI_INTEGER_BIT_SIZE) {
909 width_mask = ACPI_UINT64_MAX;
910 } else {
911 width_mask = ACPI_MASK_BITS_ABOVE(access_bit_width);
912 }
913
914 mask = width_mask &
915 ACPI_MASK_BITS_BELOW(obj_desc->common_field.start_field_bit_offset);
916
917 /* Compute the number of datums (access width data items) */
918
919 datum_count = ACPI_ROUND_UP_TO(obj_desc->common_field.bit_length,
920 access_bit_width);
921
922 field_datum_count = ACPI_ROUND_UP_TO(obj_desc->common_field.bit_length +
923 obj_desc->common_field.
924 start_field_bit_offset,
925 access_bit_width);
926
927 /* Get initial Datum from the input buffer */
928
929 ACPI_MEMCPY(&raw_datum, buffer,
930 ACPI_MIN(obj_desc->common_field.access_byte_width,
931 buffer_length - buffer_offset));
932
933 merged_datum =
934 raw_datum << obj_desc->common_field.start_field_bit_offset;
935
936 /* Write the entire field */
937
938 for (i = 1; i < field_datum_count; i++) {
939
940 /* Write merged datum to the target field */
941
942 merged_datum &= mask;
943 status = acpi_ex_write_with_update_rule(obj_desc, mask,
944 merged_datum,
945 field_offset);
946 if (ACPI_FAILURE(status)) {
947 goto exit;
948 }
949
950 field_offset += obj_desc->common_field.access_byte_width;
951
952 /*
953 * Start new output datum by merging with previous input datum
954 * if necessary.
955 *
956 * Note: Before the shift, check if the shift value will be larger than
957 * the integer size. If so, there is no need to perform the operation.
958 * This avoids the differences in behavior between different compilers
959 * concerning shift values larger than the target data width.
960 */
961 if ((access_bit_width -
962 obj_desc->common_field.start_field_bit_offset) <
963 ACPI_INTEGER_BIT_SIZE) {
964 merged_datum =
965 raw_datum >> (access_bit_width -
966 obj_desc->common_field.
967 start_field_bit_offset);
968 } else {
969 merged_datum = 0;
970 }
971
972 mask = width_mask;
973
974 if (i == datum_count) {
975 break;
976 }
977
978 /* Get the next input datum from the buffer */
979
980 buffer_offset += obj_desc->common_field.access_byte_width;
981 ACPI_MEMCPY(&raw_datum, ((char *)buffer) + buffer_offset,
982 ACPI_MIN(obj_desc->common_field.access_byte_width,
983 buffer_length - buffer_offset));
984
985 merged_datum |=
986 raw_datum << obj_desc->common_field.start_field_bit_offset;
987 }
988
989 /* Mask off any extra bits in the last datum */
990
991 buffer_tail_bits = (obj_desc->common_field.bit_length +
992 obj_desc->common_field.start_field_bit_offset) %
993 access_bit_width;
994 if (buffer_tail_bits) {
995 mask &= ACPI_MASK_BITS_ABOVE(buffer_tail_bits);
996 }
997
998 /* Write the last datum to the field */
999
1000 merged_datum &= mask;
1001 status = acpi_ex_write_with_update_rule(obj_desc,
1002 mask, merged_datum,
1003 field_offset);
1004
1005 exit:
1006 /* Free temporary buffer if we used one */
1007
1008 if (new_buffer) {
1009 ACPI_FREE(new_buffer);
1010 }
1011 return_ACPI_STATUS(status);
1012 }
kernel source for telekom puls (alcatel/mediatek)