1 /****************************************************************************** 2 * 3 * Module Name: exprep - ACPI AML field prep utilities 4 * 5 *****************************************************************************/ 6 7 /* 8 * Copyright (C) 2000 - 2017, 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 "acnamesp.h" 49 #include "acdispat.h" 50 51 #define _COMPONENT ACPI_EXECUTER 52 ACPI_MODULE_NAME("exprep") 53 54 /* Local prototypes */ 55 static u32 56 acpi_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 61 static u32 62 acpi_ex_generate_access(u32 field_bit_offset, 63 u32 field_bit_length, u32 region_length); 64 65 /******************************************************************************* 66 * 67 * FUNCTION: acpi_ex_generate_access 68 * 69 * PARAMETERS: field_bit_offset - Start of field within parent region/buffer 70 * field_bit_length - Length of field in bits 71 * region_length - Length of parent in bytes 72 * 73 * RETURN: Field granularity (8, 16, 32 or 64) and 74 * byte_alignment (1, 2, 3, or 4) 75 * 76 * DESCRIPTION: Generate an optimal access width for fields defined with the 77 * any_acc keyword. 78 * 79 * NOTE: Need to have the region_length in order to check for boundary 80 * conditions (end-of-region). However, the region_length is a deferred 81 * operation. Therefore, to complete this implementation, the generation 82 * of this access width must be deferred until the region length has 83 * been evaluated. 84 * 85 ******************************************************************************/ 86 87 static u32 88 acpi_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 /* Round Field start offset and length to "minimal" byte boundaries */ 104 105 field_byte_offset = ACPI_DIV_8(ACPI_ROUND_DOWN(field_bit_offset, 8)); 106 107 field_byte_end_offset = 108 ACPI_DIV_8(ACPI_ROUND_UP(field_bit_length + field_bit_offset, 8)); 109 110 field_byte_length = field_byte_end_offset - field_byte_offset; 111 112 ACPI_DEBUG_PRINT((ACPI_DB_BFIELD, 113 "Bit length %u, Bit offset %u\n", 114 field_bit_length, field_bit_offset)); 115 116 ACPI_DEBUG_PRINT((ACPI_DB_BFIELD, 117 "Byte Length %u, Byte Offset %u, End Offset %u\n", 118 field_byte_length, field_byte_offset, 119 field_byte_end_offset)); 120 121 /* 122 * Iterative search for the maximum access width that is both aligned 123 * and does not go beyond the end of the region 124 * 125 * Start at byte_acc and work upwards to qword_acc max. (1,2,4,8 bytes) 126 */ 127 for (access_byte_width = 1; access_byte_width <= 8; 128 access_byte_width <<= 1) { 129 /* 130 * 1) Round end offset up to next access boundary and make sure that 131 * this does not go beyond the end of the parent region. 132 * 2) When the Access width is greater than the field_byte_length, we 133 * are done. (This does not optimize for the perfectly aligned 134 * case yet). 135 */ 136 if (ACPI_ROUND_UP(field_byte_end_offset, access_byte_width) <= 137 region_length) { 138 field_start_offset = 139 ACPI_ROUND_DOWN(field_byte_offset, 140 access_byte_width) / 141 access_byte_width; 142 143 field_end_offset = 144 ACPI_ROUND_UP((field_byte_length + 145 field_byte_offset), 146 access_byte_width) / 147 access_byte_width; 148 149 accesses = field_end_offset - field_start_offset; 150 151 ACPI_DEBUG_PRINT((ACPI_DB_BFIELD, 152 "AccessWidth %u end is within region\n", 153 access_byte_width)); 154 155 ACPI_DEBUG_PRINT((ACPI_DB_BFIELD, 156 "Field Start %u, Field End %u -- requires %u accesses\n", 157 field_start_offset, field_end_offset, 158 accesses)); 159 160 /* Single access is optimal */ 161 162 if (accesses <= 1) { 163 ACPI_DEBUG_PRINT((ACPI_DB_BFIELD, 164 "Entire field can be accessed " 165 "with one operation of size %u\n", 166 access_byte_width)); 167 return_VALUE(access_byte_width); 168 } 169 170 /* 171 * Fits in the region, but requires more than one read/write. 172 * try the next wider access on next iteration 173 */ 174 if (accesses < minimum_accesses) { 175 minimum_accesses = accesses; 176 minimum_access_width = access_byte_width; 177 } 178 } else { 179 ACPI_DEBUG_PRINT((ACPI_DB_BFIELD, 180 "AccessWidth %u end is NOT within region\n", 181 access_byte_width)); 182 if (access_byte_width == 1) { 183 ACPI_DEBUG_PRINT((ACPI_DB_BFIELD, 184 "Field goes beyond end-of-region!\n")); 185 186 /* Field does not fit in the region at all */ 187 188 return_VALUE(0); 189 } 190 191 /* 192 * This width goes beyond the end-of-region, back off to 193 * previous access 194 */ 195 ACPI_DEBUG_PRINT((ACPI_DB_BFIELD, 196 "Backing off to previous optimal access width of %u\n", 197 minimum_access_width)); 198 return_VALUE(minimum_access_width); 199 } 200 } 201 202 /* 203 * Could not read/write field with one operation, 204 * just use max access width 205 */ 206 ACPI_DEBUG_PRINT((ACPI_DB_BFIELD, 207 "Cannot access field in one operation, using width 8\n")); 208 209 return_VALUE(8); 210 } 211 #endif /* ACPI_UNDER_DEVELOPMENT */ 212 213 /******************************************************************************* 214 * 215 * FUNCTION: acpi_ex_decode_field_access 216 * 217 * PARAMETERS: obj_desc - Field object 218 * field_flags - Encoded fieldflags (contains access bits) 219 * return_byte_alignment - Where the byte alignment is returned 220 * 221 * RETURN: Field granularity (8, 16, 32 or 64) and 222 * byte_alignment (1, 2, 3, or 4) 223 * 224 * DESCRIPTION: Decode the access_type bits of a field definition. 225 * 226 ******************************************************************************/ 227 228 static u32 229 acpi_ex_decode_field_access(union acpi_operand_object *obj_desc, 230 u8 field_flags, u32 * return_byte_alignment) 231 { 232 u32 access; 233 u32 byte_alignment; 234 u32 bit_length; 235 236 ACPI_FUNCTION_TRACE(ex_decode_field_access); 237 238 access = (field_flags & AML_FIELD_ACCESS_TYPE_MASK); 239 240 switch (access) { 241 case AML_FIELD_ACCESS_ANY: 242 243 #ifdef ACPI_UNDER_DEVELOPMENT 244 byte_alignment = 245 acpi_ex_generate_access(obj_desc->common_field. 246 start_field_bit_offset, 247 obj_desc->common_field.bit_length, 248 0xFFFFFFFF 249 /* Temp until we pass region_length as parameter */ 250 ); 251 bit_length = byte_alignment * 8; 252 #endif 253 254 byte_alignment = 1; 255 bit_length = 8; 256 break; 257 258 case AML_FIELD_ACCESS_BYTE: 259 case AML_FIELD_ACCESS_BUFFER: /* ACPI 2.0 (SMBus Buffer) */ 260 261 byte_alignment = 1; 262 bit_length = 8; 263 break; 264 265 case AML_FIELD_ACCESS_WORD: 266 267 byte_alignment = 2; 268 bit_length = 16; 269 break; 270 271 case AML_FIELD_ACCESS_DWORD: 272 273 byte_alignment = 4; 274 bit_length = 32; 275 break; 276 277 case AML_FIELD_ACCESS_QWORD: /* ACPI 2.0 */ 278 279 byte_alignment = 8; 280 bit_length = 64; 281 break; 282 283 default: 284 285 /* Invalid field access type */ 286 287 ACPI_ERROR((AE_INFO, "Unknown field access type 0x%X", access)); 288 289 return_UINT32(0); 290 } 291 292 if (obj_desc->common.type == ACPI_TYPE_BUFFER_FIELD) { 293 /* 294 * buffer_field access can be on any byte boundary, so the 295 * byte_alignment is always 1 byte -- regardless of any byte_alignment 296 * implied by the field access type. 297 */ 298 byte_alignment = 1; 299 } 300 301 *return_byte_alignment = byte_alignment; 302 return_UINT32(bit_length); 303 } 304 305 /******************************************************************************* 306 * 307 * FUNCTION: acpi_ex_prep_common_field_object 308 * 309 * PARAMETERS: obj_desc - The field object 310 * field_flags - Access, lock_rule, and update_rule. 311 * The format of a field_flag is described 312 * in the ACPI specification 313 * field_attribute - Special attributes (not used) 314 * field_bit_position - Field start position 315 * field_bit_length - Field length in number of bits 316 * 317 * RETURN: Status 318 * 319 * DESCRIPTION: Initialize the areas of the field object that are common 320 * to the various types of fields. Note: This is very "sensitive" 321 * code because we are solving the general case for field 322 * alignment. 323 * 324 ******************************************************************************/ 325 326 acpi_status 327 acpi_ex_prep_common_field_object(union acpi_operand_object *obj_desc, 328 u8 field_flags, 329 u8 field_attribute, 330 u32 field_bit_position, u32 field_bit_length) 331 { 332 u32 access_bit_width; 333 u32 byte_alignment; 334 u32 nearest_byte_address; 335 336 ACPI_FUNCTION_TRACE(ex_prep_common_field_object); 337 338 /* 339 * Note: the structure being initialized is the 340 * ACPI_COMMON_FIELD_INFO; No structure fields outside of the common 341 * area are initialized by this procedure. 342 */ 343 obj_desc->common_field.field_flags = field_flags; 344 obj_desc->common_field.attribute = field_attribute; 345 obj_desc->common_field.bit_length = field_bit_length; 346 347 /* 348 * Decode the access type so we can compute offsets. The access type gives 349 * two pieces of information - the width of each field access and the 350 * necessary byte_alignment (address granularity) of the access. 351 * 352 * For any_acc, the access_bit_width is the largest width that is both 353 * necessary and possible in an attempt to access the whole field in one 354 * I/O operation. However, for any_acc, the byte_alignment is always one 355 * byte. 356 * 357 * For all Buffer Fields, the byte_alignment is always one byte. 358 * 359 * For all other access types (Byte, Word, Dword, Qword), the Bitwidth is 360 * the same (equivalent) as the byte_alignment. 361 */ 362 access_bit_width = 363 acpi_ex_decode_field_access(obj_desc, field_flags, &byte_alignment); 364 if (!access_bit_width) { 365 return_ACPI_STATUS(AE_AML_OPERAND_VALUE); 366 } 367 368 /* Setup width (access granularity) fields (values are: 1, 2, 4, 8) */ 369 370 obj_desc->common_field.access_byte_width = (u8) 371 ACPI_DIV_8(access_bit_width); 372 373 /* 374 * base_byte_offset is the address of the start of the field within the 375 * region. It is the byte address of the first *datum* (field-width data 376 * unit) of the field. (i.e., the first datum that contains at least the 377 * first *bit* of the field.) 378 * 379 * Note: byte_alignment is always either equal to the access_bit_width or 8 380 * (Byte access), and it defines the addressing granularity of the parent 381 * region or buffer. 382 */ 383 nearest_byte_address = 384 ACPI_ROUND_BITS_DOWN_TO_BYTES(field_bit_position); 385 obj_desc->common_field.base_byte_offset = (u32) 386 ACPI_ROUND_DOWN(nearest_byte_address, byte_alignment); 387 388 /* 389 * start_field_bit_offset is the offset of the first bit of the field within 390 * a field datum. 391 */ 392 obj_desc->common_field.start_field_bit_offset = (u8) 393 (field_bit_position - 394 ACPI_MUL_8(obj_desc->common_field.base_byte_offset)); 395 396 return_ACPI_STATUS(AE_OK); 397 } 398 399 /******************************************************************************* 400 * 401 * FUNCTION: acpi_ex_prep_field_value 402 * 403 * PARAMETERS: info - Contains all field creation info 404 * 405 * RETURN: Status 406 * 407 * DESCRIPTION: Construct an object of type union acpi_operand_object with a 408 * subtype of def_field and connect it to the parent Node. 409 * 410 ******************************************************************************/ 411 412 acpi_status acpi_ex_prep_field_value(struct acpi_create_field_info *info) 413 { 414 union acpi_operand_object *obj_desc; 415 union acpi_operand_object *second_desc = NULL; 416 acpi_status status; 417 u32 access_byte_width; 418 u32 type; 419 420 ACPI_FUNCTION_TRACE(ex_prep_field_value); 421 422 /* Parameter validation */ 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 0x%X (%s)", type, 434 acpi_ut_get_type_name(type))); 435 436 return_ACPI_STATUS(AE_AML_OPERAND_TYPE); 437 } 438 } 439 440 /* Allocate a new field object */ 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 /* Initialize areas of the object that are common to all fields */ 448 449 obj_desc->common_field.node = info->field_node; 450 status = acpi_ex_prep_common_field_object(obj_desc, 451 info->field_flags, 452 info->attribute, 453 info->field_bit_position, 454 info->field_bit_length); 455 if (ACPI_FAILURE(status)) { 456 acpi_ut_delete_object_desc(obj_desc); 457 return_ACPI_STATUS(status); 458 } 459 460 /* Initialize areas of the object that are specific to the field type */ 461 462 switch (info->field_type) { 463 case ACPI_TYPE_LOCAL_REGION_FIELD: 464 465 obj_desc->field.region_obj = 466 acpi_ns_get_attached_object(info->region_node); 467 468 /* Fields specific to generic_serial_bus fields */ 469 470 obj_desc->field.access_length = info->access_length; 471 472 if (info->connection_node) { 473 second_desc = info->connection_node->object; 474 if (!(second_desc->common.flags & AOPOBJ_DATA_VALID)) { 475 status = 476 acpi_ds_get_buffer_arguments(second_desc); 477 if (ACPI_FAILURE(status)) { 478 acpi_ut_delete_object_desc(obj_desc); 479 return_ACPI_STATUS(status); 480 } 481 } 482 483 obj_desc->field.resource_buffer = 484 second_desc->buffer.pointer; 485 obj_desc->field.resource_length = 486 (u16)second_desc->buffer.length; 487 } else if (info->resource_buffer) { 488 obj_desc->field.resource_buffer = info->resource_buffer; 489 obj_desc->field.resource_length = info->resource_length; 490 } 491 492 obj_desc->field.pin_number_index = info->pin_number_index; 493 494 /* Allow full data read from EC address space */ 495 496 if ((obj_desc->field.region_obj->region.space_id == 497 ACPI_ADR_SPACE_EC) 498 && (obj_desc->common_field.bit_length > 8)) { 499 access_byte_width = 500 ACPI_ROUND_BITS_UP_TO_BYTES(obj_desc->common_field. 501 bit_length); 502 503 /* Maximum byte width supported is 255 */ 504 505 if (access_byte_width < 256) { 506 obj_desc->common_field.access_byte_width = 507 (u8)access_byte_width; 508 } 509 } 510 /* An additional reference for the container */ 511 512 acpi_ut_add_reference(obj_desc->field.region_obj); 513 514 ACPI_DEBUG_PRINT((ACPI_DB_BFIELD, 515 "RegionField: BitOff %X, Off %X, Gran %X, Region %p\n", 516 obj_desc->field.start_field_bit_offset, 517 obj_desc->field.base_byte_offset, 518 obj_desc->field.access_byte_width, 519 obj_desc->field.region_obj)); 520 break; 521 522 case ACPI_TYPE_LOCAL_BANK_FIELD: 523 524 obj_desc->bank_field.value = info->bank_value; 525 obj_desc->bank_field.region_obj = 526 acpi_ns_get_attached_object(info->region_node); 527 obj_desc->bank_field.bank_obj = 528 acpi_ns_get_attached_object(info->register_node); 529 530 /* An additional reference for the attached objects */ 531 532 acpi_ut_add_reference(obj_desc->bank_field.region_obj); 533 acpi_ut_add_reference(obj_desc->bank_field.bank_obj); 534 535 ACPI_DEBUG_PRINT((ACPI_DB_BFIELD, 536 "Bank Field: BitOff %X, Off %X, Gran %X, Region %p, BankReg %p\n", 537 obj_desc->bank_field.start_field_bit_offset, 538 obj_desc->bank_field.base_byte_offset, 539 obj_desc->field.access_byte_width, 540 obj_desc->bank_field.region_obj, 541 obj_desc->bank_field.bank_obj)); 542 543 /* 544 * Remember location in AML stream of the field unit 545 * opcode and operands -- since the bank_value 546 * operands must be evaluated. 547 */ 548 second_desc = obj_desc->common.next_object; 549 second_desc->extra.aml_start = 550 ACPI_CAST_PTR(union acpi_parse_object, 551 info->data_register_node)->named.data; 552 second_desc->extra.aml_length = 553 ACPI_CAST_PTR(union acpi_parse_object, 554 info->data_register_node)->named.length; 555 556 break; 557 558 case ACPI_TYPE_LOCAL_INDEX_FIELD: 559 560 /* Get the Index and Data registers */ 561 562 obj_desc->index_field.index_obj = 563 acpi_ns_get_attached_object(info->register_node); 564 obj_desc->index_field.data_obj = 565 acpi_ns_get_attached_object(info->data_register_node); 566 567 if (!obj_desc->index_field.data_obj 568 || !obj_desc->index_field.index_obj) { 569 ACPI_ERROR((AE_INFO, 570 "Null Index Object during field prep")); 571 acpi_ut_delete_object_desc(obj_desc); 572 return_ACPI_STATUS(AE_AML_INTERNAL); 573 } 574 575 /* An additional reference for the attached objects */ 576 577 acpi_ut_add_reference(obj_desc->index_field.data_obj); 578 acpi_ut_add_reference(obj_desc->index_field.index_obj); 579 580 /* 581 * April 2006: Changed to match MS behavior 582 * 583 * The value written to the Index register is the byte offset of the 584 * target field in units of the granularity of the index_field 585 * 586 * Previously, the value was calculated as an index in terms of the 587 * width of the Data register, as below: 588 * 589 * obj_desc->index_field.Value = (u32) 590 * (Info->field_bit_position / ACPI_MUL_8 ( 591 * obj_desc->Field.access_byte_width)); 592 * 593 * February 2006: Tried value as a byte offset: 594 * obj_desc->index_field.Value = (u32) 595 * ACPI_DIV_8 (Info->field_bit_position); 596 */ 597 obj_desc->index_field.value = 598 (u32) ACPI_ROUND_DOWN(ACPI_DIV_8(info->field_bit_position), 599 obj_desc->index_field. 600 access_byte_width); 601 602 ACPI_DEBUG_PRINT((ACPI_DB_BFIELD, 603 "IndexField: BitOff %X, Off %X, Value %X, " 604 "Gran %X, Index %p, Data %p\n", 605 obj_desc->index_field.start_field_bit_offset, 606 obj_desc->index_field.base_byte_offset, 607 obj_desc->index_field.value, 608 obj_desc->field.access_byte_width, 609 obj_desc->index_field.index_obj, 610 obj_desc->index_field.data_obj)); 611 break; 612 613 default: 614 615 /* No other types should get here */ 616 617 break; 618 } 619 620 /* 621 * Store the constructed descriptor (obj_desc) into the parent Node, 622 * preserving the current type of that named_obj. 623 */ 624 status = 625 acpi_ns_attach_object(info->field_node, obj_desc, 626 acpi_ns_get_type(info->field_node)); 627 628 ACPI_DEBUG_PRINT((ACPI_DB_BFIELD, 629 "Set NamedObj %p [%4.4s], ObjDesc %p\n", 630 info->field_node, 631 acpi_ut_get_node_name(info->field_node), obj_desc)); 632 633 /* Remove local reference to the object */ 634 635 acpi_ut_remove_reference(obj_desc); 636 return_ACPI_STATUS(status); 637 } 638