1/****************************************************************************** 2 * 3 * Module Name: exfield - ACPI AML (p-code) execution - field manipulation 4 * 5 *****************************************************************************/ 6 7/* 8 * Copyright (C) 2000 - 2014, 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 "acdispat.h" 47#include "acinterp.h" 48#include "amlcode.h" 49 50#define _COMPONENT ACPI_EXECUTER 51ACPI_MODULE_NAME("exfield") 52 53/* Local prototypes */ 54static u32 55acpi_ex_get_serial_access_length(u32 accessor_type, u32 access_length); 56 57/******************************************************************************* 58 * 59 * FUNCTION: acpi_ex_get_serial_access_length 60 * 61 * PARAMETERS: accessor_type - The type of the protocol indicated by region 62 * field access attributes 63 * access_length - The access length of the region field 64 * 65 * RETURN: Decoded access length 66 * 67 * DESCRIPTION: This routine returns the length of the generic_serial_bus 68 * protocol bytes 69 * 70 ******************************************************************************/ 71 72static u32 73acpi_ex_get_serial_access_length(u32 accessor_type, u32 access_length) 74{ 75 u32 length; 76 77 switch (accessor_type) { 78 case AML_FIELD_ATTRIB_QUICK: 79 80 length = 0; 81 break; 82 83 case AML_FIELD_ATTRIB_SEND_RCV: 84 case AML_FIELD_ATTRIB_BYTE: 85 86 length = 1; 87 break; 88 89 case AML_FIELD_ATTRIB_WORD: 90 case AML_FIELD_ATTRIB_WORD_CALL: 91 92 length = 2; 93 break; 94 95 case AML_FIELD_ATTRIB_MULTIBYTE: 96 case AML_FIELD_ATTRIB_RAW_BYTES: 97 case AML_FIELD_ATTRIB_RAW_PROCESS: 98 99 length = access_length; 100 break; 101 102 case AML_FIELD_ATTRIB_BLOCK: 103 case AML_FIELD_ATTRIB_BLOCK_CALL: 104 default: 105 106 length = ACPI_GSBUS_BUFFER_SIZE - 2; 107 break; 108 } 109 110 return (length); 111} 112 113/******************************************************************************* 114 * 115 * FUNCTION: acpi_ex_read_data_from_field 116 * 117 * PARAMETERS: walk_state - Current execution state 118 * obj_desc - The named field 119 * ret_buffer_desc - Where the return data object is stored 120 * 121 * RETURN: Status 122 * 123 * DESCRIPTION: Read from a named field. Returns either an Integer or a 124 * Buffer, depending on the size of the field. 125 * 126 ******************************************************************************/ 127 128acpi_status 129acpi_ex_read_data_from_field(struct acpi_walk_state * walk_state, 130 union acpi_operand_object *obj_desc, 131 union acpi_operand_object **ret_buffer_desc) 132{ 133 acpi_status status; 134 union acpi_operand_object *buffer_desc; 135 acpi_size length; 136 void *buffer; 137 u32 function; 138 u16 accessor_type; 139 140 ACPI_FUNCTION_TRACE_PTR(ex_read_data_from_field, obj_desc); 141 142 /* Parameter validation */ 143 144 if (!obj_desc) { 145 return_ACPI_STATUS(AE_AML_NO_OPERAND); 146 } 147 if (!ret_buffer_desc) { 148 return_ACPI_STATUS(AE_BAD_PARAMETER); 149 } 150 151 if (obj_desc->common.type == ACPI_TYPE_BUFFER_FIELD) { 152 /* 153 * If the buffer_field arguments have not been previously evaluated, 154 * evaluate them now and save the results. 155 */ 156 if (!(obj_desc->common.flags & AOPOBJ_DATA_VALID)) { 157 status = acpi_ds_get_buffer_field_arguments(obj_desc); 158 if (ACPI_FAILURE(status)) { 159 return_ACPI_STATUS(status); 160 } 161 } 162 } else if ((obj_desc->common.type == ACPI_TYPE_LOCAL_REGION_FIELD) && 163 (obj_desc->field.region_obj->region.space_id == 164 ACPI_ADR_SPACE_SMBUS 165 || obj_desc->field.region_obj->region.space_id == 166 ACPI_ADR_SPACE_GSBUS 167 || obj_desc->field.region_obj->region.space_id == 168 ACPI_ADR_SPACE_IPMI)) { 169 /* 170 * This is an SMBus, GSBus or IPMI read. We must create a buffer to hold 171 * the data and then directly access the region handler. 172 * 173 * Note: SMBus and GSBus protocol value is passed in upper 16-bits of Function 174 */ 175 if (obj_desc->field.region_obj->region.space_id == 176 ACPI_ADR_SPACE_SMBUS) { 177 length = ACPI_SMBUS_BUFFER_SIZE; 178 function = 179 ACPI_READ | (obj_desc->field.attribute << 16); 180 } else if (obj_desc->field.region_obj->region.space_id == 181 ACPI_ADR_SPACE_GSBUS) { 182 accessor_type = obj_desc->field.attribute; 183 length = acpi_ex_get_serial_access_length(accessor_type, 184 obj_desc-> 185 field. 186 access_length); 187 188 /* 189 * Add additional 2 bytes for the generic_serial_bus data buffer: 190 * 191 * Status; (Byte 0 of the data buffer) 192 * Length; (Byte 1 of the data buffer) 193 * Data[x-1]; (Bytes 2-x of the arbitrary length data buffer) 194 */ 195 length += 2; 196 function = ACPI_READ | (accessor_type << 16); 197 } else { /* IPMI */ 198 199 length = ACPI_IPMI_BUFFER_SIZE; 200 function = ACPI_READ; 201 } 202 203 buffer_desc = acpi_ut_create_buffer_object(length); 204 if (!buffer_desc) { 205 return_ACPI_STATUS(AE_NO_MEMORY); 206 } 207 208 /* Lock entire transaction if requested */ 209 210 acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags); 211 212 /* Call the region handler for the read */ 213 214 status = acpi_ex_access_region(obj_desc, 0, 215 ACPI_CAST_PTR(u64, 216 buffer_desc-> 217 buffer.pointer), 218 function); 219 acpi_ex_release_global_lock(obj_desc->common_field.field_flags); 220 goto exit; 221 } 222 223 /* 224 * Allocate a buffer for the contents of the field. 225 * 226 * If the field is larger than the current integer width, create 227 * a BUFFER to hold it. Otherwise, use an INTEGER. This allows 228 * the use of arithmetic operators on the returned value if the 229 * field size is equal or smaller than an Integer. 230 * 231 * Note: Field.length is in bits. 232 */ 233 length = 234 (acpi_size) ACPI_ROUND_BITS_UP_TO_BYTES(obj_desc->field.bit_length); 235 if (length > acpi_gbl_integer_byte_width) { 236 237 /* Field is too large for an Integer, create a Buffer instead */ 238 239 buffer_desc = acpi_ut_create_buffer_object(length); 240 if (!buffer_desc) { 241 return_ACPI_STATUS(AE_NO_MEMORY); 242 } 243 buffer = buffer_desc->buffer.pointer; 244 } else { 245 /* Field will fit within an Integer (normal case) */ 246 247 buffer_desc = acpi_ut_create_integer_object((u64) 0); 248 if (!buffer_desc) { 249 return_ACPI_STATUS(AE_NO_MEMORY); 250 } 251 252 length = acpi_gbl_integer_byte_width; 253 buffer = &buffer_desc->integer.value; 254 } 255 256 if ((obj_desc->common.type == ACPI_TYPE_LOCAL_REGION_FIELD) && 257 (obj_desc->field.region_obj->region.space_id == 258 ACPI_ADR_SPACE_GPIO)) { 259 /* 260 * For GPIO (general_purpose_io), the Address will be the bit offset 261 * from the previous Connection() operator, making it effectively a 262 * pin number index. The bit_length is the length of the field, which 263 * is thus the number of pins. 264 */ 265 ACPI_DEBUG_PRINT((ACPI_DB_BFIELD, 266 "GPIO FieldRead [FROM]: Pin %u Bits %u\n", 267 obj_desc->field.pin_number_index, 268 obj_desc->field.bit_length)); 269 270 /* Lock entire transaction if requested */ 271 272 acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags); 273 274 /* Perform the write */ 275 276 status = acpi_ex_access_region(obj_desc, 0, 277 (u64 *)buffer, ACPI_READ); 278 acpi_ex_release_global_lock(obj_desc->common_field.field_flags); 279 if (ACPI_FAILURE(status)) { 280 acpi_ut_remove_reference(buffer_desc); 281 } else { 282 *ret_buffer_desc = buffer_desc; 283 } 284 return_ACPI_STATUS(status); 285 } 286 287 ACPI_DEBUG_PRINT((ACPI_DB_BFIELD, 288 "FieldRead [TO]: Obj %p, Type %X, Buf %p, ByteLen %X\n", 289 obj_desc, obj_desc->common.type, buffer, 290 (u32) length)); 291 ACPI_DEBUG_PRINT((ACPI_DB_BFIELD, 292 "FieldRead [FROM]: BitLen %X, BitOff %X, ByteOff %X\n", 293 obj_desc->common_field.bit_length, 294 obj_desc->common_field.start_field_bit_offset, 295 obj_desc->common_field.base_byte_offset)); 296 297 /* Lock entire transaction if requested */ 298 299 acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags); 300 301 /* Read from the field */ 302 303 status = acpi_ex_extract_from_field(obj_desc, buffer, (u32) length); 304 acpi_ex_release_global_lock(obj_desc->common_field.field_flags); 305 306exit: 307 if (ACPI_FAILURE(status)) { 308 acpi_ut_remove_reference(buffer_desc); 309 } else { 310 *ret_buffer_desc = buffer_desc; 311 } 312 313 return_ACPI_STATUS(status); 314} 315 316/******************************************************************************* 317 * 318 * FUNCTION: acpi_ex_write_data_to_field 319 * 320 * PARAMETERS: source_desc - Contains data to write 321 * obj_desc - The named field 322 * result_desc - Where the return value is returned, if any 323 * 324 * RETURN: Status 325 * 326 * DESCRIPTION: Write to a named field 327 * 328 ******************************************************************************/ 329 330acpi_status 331acpi_ex_write_data_to_field(union acpi_operand_object *source_desc, 332 union acpi_operand_object *obj_desc, 333 union acpi_operand_object **result_desc) 334{ 335 acpi_status status; 336 u32 length; 337 void *buffer; 338 union acpi_operand_object *buffer_desc; 339 u32 function; 340 u16 accessor_type; 341 342 ACPI_FUNCTION_TRACE_PTR(ex_write_data_to_field, obj_desc); 343 344 /* Parameter validation */ 345 346 if (!source_desc || !obj_desc) { 347 return_ACPI_STATUS(AE_AML_NO_OPERAND); 348 } 349 350 if (obj_desc->common.type == ACPI_TYPE_BUFFER_FIELD) { 351 /* 352 * If the buffer_field arguments have not been previously evaluated, 353 * evaluate them now and save the results. 354 */ 355 if (!(obj_desc->common.flags & AOPOBJ_DATA_VALID)) { 356 status = acpi_ds_get_buffer_field_arguments(obj_desc); 357 if (ACPI_FAILURE(status)) { 358 return_ACPI_STATUS(status); 359 } 360 } 361 } else if ((obj_desc->common.type == ACPI_TYPE_LOCAL_REGION_FIELD) && 362 (obj_desc->field.region_obj->region.space_id == 363 ACPI_ADR_SPACE_SMBUS 364 || obj_desc->field.region_obj->region.space_id == 365 ACPI_ADR_SPACE_GSBUS 366 || obj_desc->field.region_obj->region.space_id == 367 ACPI_ADR_SPACE_IPMI)) { 368 /* 369 * This is an SMBus, GSBus or IPMI write. We will bypass the entire field 370 * mechanism and handoff the buffer directly to the handler. For 371 * these address spaces, the buffer is bi-directional; on a write, 372 * return data is returned in the same buffer. 373 * 374 * Source must be a buffer of sufficient size: 375 * ACPI_SMBUS_BUFFER_SIZE, ACPI_GSBUS_BUFFER_SIZE, or ACPI_IPMI_BUFFER_SIZE. 376 * 377 * Note: SMBus and GSBus protocol type is passed in upper 16-bits of Function 378 */ 379 if (source_desc->common.type != ACPI_TYPE_BUFFER) { 380 ACPI_ERROR((AE_INFO, 381 "SMBus/IPMI/GenericSerialBus write requires Buffer, found type %s", 382 acpi_ut_get_object_type_name(source_desc))); 383 384 return_ACPI_STATUS(AE_AML_OPERAND_TYPE); 385 } 386 387 if (obj_desc->field.region_obj->region.space_id == 388 ACPI_ADR_SPACE_SMBUS) { 389 length = ACPI_SMBUS_BUFFER_SIZE; 390 function = 391 ACPI_WRITE | (obj_desc->field.attribute << 16); 392 } else if (obj_desc->field.region_obj->region.space_id == 393 ACPI_ADR_SPACE_GSBUS) { 394 accessor_type = obj_desc->field.attribute; 395 length = acpi_ex_get_serial_access_length(accessor_type, 396 obj_desc-> 397 field. 398 access_length); 399 400 /* 401 * Add additional 2 bytes for the generic_serial_bus data buffer: 402 * 403 * Status; (Byte 0 of the data buffer) 404 * Length; (Byte 1 of the data buffer) 405 * Data[x-1]; (Bytes 2-x of the arbitrary length data buffer) 406 */ 407 length += 2; 408 function = ACPI_WRITE | (accessor_type << 16); 409 } else { /* IPMI */ 410 411 length = ACPI_IPMI_BUFFER_SIZE; 412 function = ACPI_WRITE; 413 } 414 415 if (source_desc->buffer.length < length) { 416 ACPI_ERROR((AE_INFO, 417 "SMBus/IPMI/GenericSerialBus write requires Buffer of length %u, found length %u", 418 length, source_desc->buffer.length)); 419 420 return_ACPI_STATUS(AE_AML_BUFFER_LIMIT); 421 } 422 423 /* Create the bi-directional buffer */ 424 425 buffer_desc = acpi_ut_create_buffer_object(length); 426 if (!buffer_desc) { 427 return_ACPI_STATUS(AE_NO_MEMORY); 428 } 429 430 buffer = buffer_desc->buffer.pointer; 431 ACPI_MEMCPY(buffer, source_desc->buffer.pointer, length); 432 433 /* Lock entire transaction if requested */ 434 435 acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags); 436 437 /* 438 * Perform the write (returns status and perhaps data in the 439 * same buffer) 440 */ 441 status = acpi_ex_access_region(obj_desc, 0, 442 (u64 *) buffer, function); 443 acpi_ex_release_global_lock(obj_desc->common_field.field_flags); 444 445 *result_desc = buffer_desc; 446 return_ACPI_STATUS(status); 447 } else if ((obj_desc->common.type == ACPI_TYPE_LOCAL_REGION_FIELD) && 448 (obj_desc->field.region_obj->region.space_id == 449 ACPI_ADR_SPACE_GPIO)) { 450 /* 451 * For GPIO (general_purpose_io), we will bypass the entire field 452 * mechanism and handoff the bit address and bit width directly to 453 * the handler. The Address will be the bit offset 454 * from the previous Connection() operator, making it effectively a 455 * pin number index. The bit_length is the length of the field, which 456 * is thus the number of pins. 457 */ 458 if (source_desc->common.type != ACPI_TYPE_INTEGER) { 459 return_ACPI_STATUS(AE_AML_OPERAND_TYPE); 460 } 461 462 ACPI_DEBUG_PRINT((ACPI_DB_BFIELD, 463 "GPIO FieldWrite [FROM]: (%s:%X), Val %.8X [TO]: Pin %u Bits %u\n", 464 acpi_ut_get_type_name(source_desc->common. 465 type), 466 source_desc->common.type, 467 (u32)source_desc->integer.value, 468 obj_desc->field.pin_number_index, 469 obj_desc->field.bit_length)); 470 471 buffer = &source_desc->integer.value; 472 473 /* Lock entire transaction if requested */ 474 475 acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags); 476 477 /* Perform the write */ 478 479 status = acpi_ex_access_region(obj_desc, 0, 480 (u64 *)buffer, ACPI_WRITE); 481 acpi_ex_release_global_lock(obj_desc->common_field.field_flags); 482 return_ACPI_STATUS(status); 483 } 484 485 /* Get a pointer to the data to be written */ 486 487 switch (source_desc->common.type) { 488 case ACPI_TYPE_INTEGER: 489 490 buffer = &source_desc->integer.value; 491 length = sizeof(source_desc->integer.value); 492 break; 493 494 case ACPI_TYPE_BUFFER: 495 496 buffer = source_desc->buffer.pointer; 497 length = source_desc->buffer.length; 498 break; 499 500 case ACPI_TYPE_STRING: 501 502 buffer = source_desc->string.pointer; 503 length = source_desc->string.length; 504 break; 505 506 default: 507 508 return_ACPI_STATUS(AE_AML_OPERAND_TYPE); 509 } 510 511 ACPI_DEBUG_PRINT((ACPI_DB_BFIELD, 512 "FieldWrite [FROM]: Obj %p (%s:%X), Buf %p, ByteLen %X\n", 513 source_desc, 514 acpi_ut_get_type_name(source_desc->common.type), 515 source_desc->common.type, buffer, length)); 516 517 ACPI_DEBUG_PRINT((ACPI_DB_BFIELD, 518 "FieldWrite [TO]: Obj %p (%s:%X), BitLen %X, BitOff %X, ByteOff %X\n", 519 obj_desc, 520 acpi_ut_get_type_name(obj_desc->common.type), 521 obj_desc->common.type, 522 obj_desc->common_field.bit_length, 523 obj_desc->common_field.start_field_bit_offset, 524 obj_desc->common_field.base_byte_offset)); 525 526 /* Lock entire transaction if requested */ 527 528 acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags); 529 530 /* Write to the field */ 531 532 status = acpi_ex_insert_into_field(obj_desc, buffer, length); 533 acpi_ex_release_global_lock(obj_desc->common_field.field_flags); 534 535 return_ACPI_STATUS(status); 536} 537