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45#include <acpi/acpi.h>
46#include "accommon.h"
47#include "acinterp.h"
48#include "amlcode.h"
49#include "acnamesp.h"
50
51#define _COMPONENT ACPI_EXECUTER
52ACPI_MODULE_NAME("exprep")
53
54
55static u32
56acpi_ex_decode_field_access(union acpi_operand_object *obj_desc,
57 u8 field_flags, u32 * return_byte_alignment);
58
59#ifdef ACPI_UNDER_DEVELOPMENT
60
61static u32
62acpi_ex_generate_access(u32 field_bit_offset,
63 u32 field_bit_length, u32 region_length);
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86
87static u32
88acpi_ex_generate_access(u32 field_bit_offset,
89 u32 field_bit_length, u32 region_length)
90{
91 u32 field_byte_length;
92 u32 field_byte_offset;
93 u32 field_byte_end_offset;
94 u32 access_byte_width;
95 u32 field_start_offset;
96 u32 field_end_offset;
97 u32 minimum_access_width = 0xFFFFFFFF;
98 u32 minimum_accesses = 0xFFFFFFFF;
99 u32 accesses;
100
101 ACPI_FUNCTION_TRACE(ex_generate_access);
102
103
104
105 field_byte_offset = ACPI_DIV_8(ACPI_ROUND_DOWN(field_bit_offset, 8));
106 field_byte_end_offset = ACPI_DIV_8(ACPI_ROUND_UP(field_bit_length +
107 field_bit_offset, 8));
108 field_byte_length = field_byte_end_offset - field_byte_offset;
109
110 ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
111 "Bit length %d, Bit offset %d\n",
112 field_bit_length, field_bit_offset));
113
114 ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
115 "Byte Length %d, Byte Offset %d, End Offset %d\n",
116 field_byte_length, field_byte_offset,
117 field_byte_end_offset));
118
119
120
121
122
123
124
125 for (access_byte_width = 1; access_byte_width <= 8;
126 access_byte_width <<= 1) {
127
128
129
130
131
132
133
134 if (ACPI_ROUND_UP(field_byte_end_offset, access_byte_width) <=
135 region_length) {
136 field_start_offset =
137 ACPI_ROUND_DOWN(field_byte_offset,
138 access_byte_width) /
139 access_byte_width;
140
141 field_end_offset =
142 ACPI_ROUND_UP((field_byte_length +
143 field_byte_offset),
144 access_byte_width) /
145 access_byte_width;
146
147 accesses = field_end_offset - field_start_offset;
148
149 ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
150 "AccessWidth %d end is within region\n",
151 access_byte_width));
152
153 ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
154 "Field Start %d, Field End %d -- requires %d accesses\n",
155 field_start_offset, field_end_offset,
156 accesses));
157
158
159
160 if (accesses <= 1) {
161 ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
162 "Entire field can be accessed with one operation of size %d\n",
163 access_byte_width));
164 return_VALUE(access_byte_width);
165 }
166
167
168
169
170
171 if (accesses < minimum_accesses) {
172 minimum_accesses = accesses;
173 minimum_access_width = access_byte_width;
174 }
175 } else {
176 ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
177 "AccessWidth %d end is NOT within region\n",
178 access_byte_width));
179 if (access_byte_width == 1) {
180 ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
181 "Field goes beyond end-of-region!\n"));
182
183
184
185 return_VALUE(0);
186 }
187
188
189
190
191
192 ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
193 "Backing off to previous optimal access width of %d\n",
194 minimum_access_width));
195 return_VALUE(minimum_access_width);
196 }
197 }
198
199
200
201
202
203 ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
204 "Cannot access field in one operation, using width 8\n"));
205 return_VALUE(8);
206}
207#endif
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224static u32
225acpi_ex_decode_field_access(union acpi_operand_object *obj_desc,
226 u8 field_flags, u32 * return_byte_alignment)
227{
228 u32 access;
229 u32 byte_alignment;
230 u32 bit_length;
231
232 ACPI_FUNCTION_TRACE(ex_decode_field_access);
233
234 access = (field_flags & AML_FIELD_ACCESS_TYPE_MASK);
235
236 switch (access) {
237 case AML_FIELD_ACCESS_ANY:
238
239#ifdef ACPI_UNDER_DEVELOPMENT
240 byte_alignment =
241 acpi_ex_generate_access(obj_desc->common_field.
242 start_field_bit_offset,
243 obj_desc->common_field.bit_length,
244 0xFFFFFFFF
245
246 );
247 bit_length = byte_alignment * 8;
248#endif
249
250 byte_alignment = 1;
251 bit_length = 8;
252 break;
253
254 case AML_FIELD_ACCESS_BYTE:
255 case AML_FIELD_ACCESS_BUFFER:
256 byte_alignment = 1;
257 bit_length = 8;
258 break;
259
260 case AML_FIELD_ACCESS_WORD:
261 byte_alignment = 2;
262 bit_length = 16;
263 break;
264
265 case AML_FIELD_ACCESS_DWORD:
266 byte_alignment = 4;
267 bit_length = 32;
268 break;
269
270 case AML_FIELD_ACCESS_QWORD:
271 byte_alignment = 8;
272 bit_length = 64;
273 break;
274
275 default:
276
277
278 ACPI_ERROR((AE_INFO, "Unknown field access type %X", access));
279 return_UINT32(0);
280 }
281
282 if (obj_desc->common.type == ACPI_TYPE_BUFFER_FIELD) {
283
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287
288 byte_alignment = 1;
289 }
290
291 *return_byte_alignment = byte_alignment;
292 return_UINT32(bit_length);
293}
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316acpi_status
317acpi_ex_prep_common_field_object(union acpi_operand_object *obj_desc,
318 u8 field_flags,
319 u8 field_attribute,
320 u32 field_bit_position, u32 field_bit_length)
321{
322 u32 access_bit_width;
323 u32 byte_alignment;
324 u32 nearest_byte_address;
325
326 ACPI_FUNCTION_TRACE(ex_prep_common_field_object);
327
328
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332
333 obj_desc->common_field.field_flags = field_flags;
334 obj_desc->common_field.attribute = field_attribute;
335 obj_desc->common_field.bit_length = field_bit_length;
336
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352 access_bit_width = acpi_ex_decode_field_access(obj_desc, field_flags,
353 &byte_alignment);
354 if (!access_bit_width) {
355 return_ACPI_STATUS(AE_AML_OPERAND_VALUE);
356 }
357
358
359
360 obj_desc->common_field.access_byte_width = (u8)
361 ACPI_DIV_8(access_bit_width);
362
363 obj_desc->common_field.access_bit_width = (u8) access_bit_width;
364
365
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374
375 nearest_byte_address =
376 ACPI_ROUND_BITS_DOWN_TO_BYTES(field_bit_position);
377 obj_desc->common_field.base_byte_offset = (u32)
378 ACPI_ROUND_DOWN(nearest_byte_address, byte_alignment);
379
380
381
382
383
384 obj_desc->common_field.start_field_bit_offset = (u8)
385 (field_bit_position -
386 ACPI_MUL_8(obj_desc->common_field.base_byte_offset));
387
388
389
390
391
392 if ((obj_desc->common_field.start_field_bit_offset +
393 field_bit_length) <= (u16) access_bit_width) {
394 obj_desc->common.flags |= AOPOBJ_SINGLE_DATUM;
395 }
396
397 return_ACPI_STATUS(AE_OK);
398}
399
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412
413acpi_status acpi_ex_prep_field_value(struct acpi_create_field_info *info)
414{
415 union acpi_operand_object *obj_desc;
416 union acpi_operand_object *second_desc = NULL;
417 u32 type;
418 acpi_status status;
419
420 ACPI_FUNCTION_TRACE(ex_prep_field_value);
421
422
423
424 if (info->field_type != ACPI_TYPE_LOCAL_INDEX_FIELD) {
425 if (!info->region_node) {
426 ACPI_ERROR((AE_INFO, "Null RegionNode"));
427 return_ACPI_STATUS(AE_AML_NO_OPERAND);
428 }
429
430 type = acpi_ns_get_type(info->region_node);
431 if (type != ACPI_TYPE_REGION) {
432 ACPI_ERROR((AE_INFO,
433 "Needed Region, found type %X (%s)",
434 type, acpi_ut_get_type_name(type)));
435
436 return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
437 }
438 }
439
440
441
442 obj_desc = acpi_ut_create_internal_object(info->field_type);
443 if (!obj_desc) {
444 return_ACPI_STATUS(AE_NO_MEMORY);
445 }
446
447
448
449 obj_desc->common_field.node = info->field_node;
450 status = acpi_ex_prep_common_field_object(obj_desc, info->field_flags,
451 info->attribute,
452 info->field_bit_position,
453 info->field_bit_length);
454 if (ACPI_FAILURE(status)) {
455 acpi_ut_delete_object_desc(obj_desc);
456 return_ACPI_STATUS(status);
457 }
458
459
460
461 switch (info->field_type) {
462 case ACPI_TYPE_LOCAL_REGION_FIELD:
463
464 obj_desc->field.region_obj =
465 acpi_ns_get_attached_object(info->region_node);
466
467
468
469 acpi_ut_add_reference(obj_desc->field.region_obj);
470
471 ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
472 "RegionField: BitOff %X, Off %X, Gran %X, Region %p\n",
473 obj_desc->field.start_field_bit_offset,
474 obj_desc->field.base_byte_offset,
475 obj_desc->field.access_byte_width,
476 obj_desc->field.region_obj));
477 break;
478
479 case ACPI_TYPE_LOCAL_BANK_FIELD:
480
481 obj_desc->bank_field.value = info->bank_value;
482 obj_desc->bank_field.region_obj =
483 acpi_ns_get_attached_object(info->region_node);
484 obj_desc->bank_field.bank_obj =
485 acpi_ns_get_attached_object(info->register_node);
486
487
488
489 acpi_ut_add_reference(obj_desc->bank_field.region_obj);
490 acpi_ut_add_reference(obj_desc->bank_field.bank_obj);
491
492 ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
493 "Bank Field: BitOff %X, Off %X, Gran %X, Region %p, BankReg %p\n",
494 obj_desc->bank_field.start_field_bit_offset,
495 obj_desc->bank_field.base_byte_offset,
496 obj_desc->field.access_byte_width,
497 obj_desc->bank_field.region_obj,
498 obj_desc->bank_field.bank_obj));
499
500
501
502
503
504
505 second_desc = obj_desc->common.next_object;
506 second_desc->extra.aml_start =
507 ACPI_CAST_PTR(union acpi_parse_object,
508 info->data_register_node)->named.data;
509 second_desc->extra.aml_length =
510 ACPI_CAST_PTR(union acpi_parse_object,
511 info->data_register_node)->named.length;
512
513 break;
514
515 case ACPI_TYPE_LOCAL_INDEX_FIELD:
516
517
518
519 obj_desc->index_field.index_obj =
520 acpi_ns_get_attached_object(info->register_node);
521 obj_desc->index_field.data_obj =
522 acpi_ns_get_attached_object(info->data_register_node);
523
524 if (!obj_desc->index_field.data_obj
525 || !obj_desc->index_field.index_obj) {
526 ACPI_ERROR((AE_INFO,
527 "Null Index Object during field prep"));
528 acpi_ut_delete_object_desc(obj_desc);
529 return_ACPI_STATUS(AE_AML_INTERNAL);
530 }
531
532
533
534 acpi_ut_add_reference(obj_desc->index_field.data_obj);
535 acpi_ut_add_reference(obj_desc->index_field.index_obj);
536
537
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552
553
554 obj_desc->index_field.value =
555 (u32) ACPI_ROUND_DOWN(ACPI_DIV_8(info->field_bit_position),
556 obj_desc->index_field.
557 access_byte_width);
558
559 ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
560 "IndexField: BitOff %X, Off %X, Value %X, Gran %X, Index %p, Data %p\n",
561 obj_desc->index_field.start_field_bit_offset,
562 obj_desc->index_field.base_byte_offset,
563 obj_desc->index_field.value,
564 obj_desc->field.access_byte_width,
565 obj_desc->index_field.index_obj,
566 obj_desc->index_field.data_obj));
567 break;
568
569 default:
570
571 break;
572 }
573
574
575
576
577
578 status = acpi_ns_attach_object(info->field_node, obj_desc,
579 acpi_ns_get_type(info->field_node));
580
581 ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
582 "Set NamedObj %p [%4.4s], ObjDesc %p\n",
583 info->field_node,
584 acpi_ut_get_node_name(info->field_node), obj_desc));
585
586
587
588 acpi_ut_remove_reference(obj_desc);
589 return_ACPI_STATUS(status);
590}
591