1 /****************************************************************************** 2 * 3 * Module Name: exconfig - Namespace reconfiguration (Load/Unload opcodes) 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 "acnamesp.h" 48 #include "actables.h" 49 #include "acdispat.h" 50 #include "acevents.h" 51 #include "amlcode.h" 52 53 #define _COMPONENT ACPI_EXECUTER 54 ACPI_MODULE_NAME("exconfig") 55 56 /* Local prototypes */ 57 static acpi_status 58 acpi_ex_add_table(u32 table_index, union acpi_operand_object **ddb_handle); 59 60 static acpi_status 61 acpi_ex_region_read(union acpi_operand_object *obj_desc, 62 u32 length, u8 *buffer); 63 64 /******************************************************************************* 65 * 66 * FUNCTION: acpi_ex_add_table 67 * 68 * PARAMETERS: table - Pointer to raw table 69 * parent_node - Where to load the table (scope) 70 * ddb_handle - Where to return the table handle. 71 * 72 * RETURN: Status 73 * 74 * DESCRIPTION: Common function to Install and Load an ACPI table with a 75 * returned table handle. 76 * 77 ******************************************************************************/ 78 79 static acpi_status 80 acpi_ex_add_table(u32 table_index, union acpi_operand_object **ddb_handle) 81 { 82 union acpi_operand_object *obj_desc; 83 84 ACPI_FUNCTION_TRACE(ex_add_table); 85 86 /* Create an object to be the table handle */ 87 88 obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_LOCAL_REFERENCE); 89 if (!obj_desc) { 90 return_ACPI_STATUS(AE_NO_MEMORY); 91 } 92 93 /* Init the table handle */ 94 95 obj_desc->common.flags |= AOPOBJ_DATA_VALID; 96 obj_desc->reference.class = ACPI_REFCLASS_TABLE; 97 obj_desc->reference.value = table_index; 98 *ddb_handle = obj_desc; 99 return_ACPI_STATUS(AE_OK); 100 } 101 102 /******************************************************************************* 103 * 104 * FUNCTION: acpi_ex_load_table_op 105 * 106 * PARAMETERS: walk_state - Current state with operands 107 * return_desc - Where to store the return object 108 * 109 * RETURN: Status 110 * 111 * DESCRIPTION: Load an ACPI table from the RSDT/XSDT 112 * 113 ******************************************************************************/ 114 115 acpi_status 116 acpi_ex_load_table_op(struct acpi_walk_state *walk_state, 117 union acpi_operand_object **return_desc) 118 { 119 acpi_status status; 120 union acpi_operand_object **operand = &walk_state->operands[0]; 121 struct acpi_namespace_node *parent_node; 122 struct acpi_namespace_node *start_node; 123 struct acpi_namespace_node *parameter_node = NULL; 124 union acpi_operand_object *ddb_handle; 125 u32 table_index; 126 127 ACPI_FUNCTION_TRACE(ex_load_table_op); 128 129 /* Find the ACPI table in the RSDT/XSDT */ 130 131 acpi_ex_exit_interpreter(); 132 status = acpi_tb_find_table(operand[0]->string.pointer, 133 operand[1]->string.pointer, 134 operand[2]->string.pointer, &table_index); 135 acpi_ex_enter_interpreter(); 136 if (ACPI_FAILURE(status)) { 137 if (status != AE_NOT_FOUND) { 138 return_ACPI_STATUS(status); 139 } 140 141 /* Table not found, return an Integer=0 and AE_OK */ 142 143 ddb_handle = acpi_ut_create_integer_object((u64) 0); 144 if (!ddb_handle) { 145 return_ACPI_STATUS(AE_NO_MEMORY); 146 } 147 148 *return_desc = ddb_handle; 149 return_ACPI_STATUS(AE_OK); 150 } 151 152 /* Default nodes */ 153 154 start_node = walk_state->scope_info->scope.node; 155 parent_node = acpi_gbl_root_node; 156 157 /* root_path (optional parameter) */ 158 159 if (operand[3]->string.length > 0) { 160 /* 161 * Find the node referenced by the root_path_string. This is the 162 * location within the namespace where the table will be loaded. 163 */ 164 status = acpi_ns_get_node_unlocked(start_node, 165 operand[3]->string.pointer, 166 ACPI_NS_SEARCH_PARENT, 167 &parent_node); 168 if (ACPI_FAILURE(status)) { 169 return_ACPI_STATUS(status); 170 } 171 } 172 173 /* parameter_path (optional parameter) */ 174 175 if (operand[4]->string.length > 0) { 176 if ((operand[4]->string.pointer[0] != AML_ROOT_PREFIX) && 177 (operand[4]->string.pointer[0] != AML_PARENT_PREFIX)) { 178 /* 179 * Path is not absolute, so it will be relative to the node 180 * referenced by the root_path_string (or the NS root if omitted) 181 */ 182 start_node = parent_node; 183 } 184 185 /* Find the node referenced by the parameter_path_string */ 186 187 status = acpi_ns_get_node_unlocked(start_node, 188 operand[4]->string.pointer, 189 ACPI_NS_SEARCH_PARENT, 190 ¶meter_node); 191 if (ACPI_FAILURE(status)) { 192 return_ACPI_STATUS(status); 193 } 194 } 195 196 /* Load the table into the namespace */ 197 198 ACPI_INFO(("Dynamic OEM Table Load:")); 199 acpi_ex_exit_interpreter(); 200 status = acpi_tb_load_table(table_index, parent_node); 201 acpi_ex_enter_interpreter(); 202 if (ACPI_FAILURE(status)) { 203 return_ACPI_STATUS(status); 204 } 205 206 status = acpi_ex_add_table(table_index, &ddb_handle); 207 if (ACPI_FAILURE(status)) { 208 return_ACPI_STATUS(status); 209 } 210 211 /* Parameter Data (optional) */ 212 213 if (parameter_node) { 214 215 /* Store the parameter data into the optional parameter object */ 216 217 status = acpi_ex_store(operand[5], 218 ACPI_CAST_PTR(union acpi_operand_object, 219 parameter_node), 220 walk_state); 221 if (ACPI_FAILURE(status)) { 222 (void)acpi_ex_unload_table(ddb_handle); 223 224 acpi_ut_remove_reference(ddb_handle); 225 return_ACPI_STATUS(status); 226 } 227 } 228 229 *return_desc = ddb_handle; 230 return_ACPI_STATUS(status); 231 } 232 233 /******************************************************************************* 234 * 235 * FUNCTION: acpi_ex_region_read 236 * 237 * PARAMETERS: obj_desc - Region descriptor 238 * length - Number of bytes to read 239 * buffer - Pointer to where to put the data 240 * 241 * RETURN: Status 242 * 243 * DESCRIPTION: Read data from an operation region. The read starts from the 244 * beginning of the region. 245 * 246 ******************************************************************************/ 247 248 static acpi_status 249 acpi_ex_region_read(union acpi_operand_object *obj_desc, u32 length, u8 *buffer) 250 { 251 acpi_status status; 252 u64 value; 253 u32 region_offset = 0; 254 u32 i; 255 256 /* Bytewise reads */ 257 258 for (i = 0; i < length; i++) { 259 status = 260 acpi_ev_address_space_dispatch(obj_desc, NULL, ACPI_READ, 261 region_offset, 8, &value); 262 if (ACPI_FAILURE(status)) { 263 return (status); 264 } 265 266 *buffer = (u8)value; 267 buffer++; 268 region_offset++; 269 } 270 271 return (AE_OK); 272 } 273 274 /******************************************************************************* 275 * 276 * FUNCTION: acpi_ex_load_op 277 * 278 * PARAMETERS: obj_desc - Region or Buffer/Field where the table will be 279 * obtained 280 * target - Where a handle to the table will be stored 281 * walk_state - Current state 282 * 283 * RETURN: Status 284 * 285 * DESCRIPTION: Load an ACPI table from a field or operation region 286 * 287 * NOTE: Region Fields (Field, bank_field, index_fields) are resolved to buffer 288 * objects before this code is reached. 289 * 290 * If source is an operation region, it must refer to system_memory, as 291 * per the ACPI specification. 292 * 293 ******************************************************************************/ 294 295 acpi_status 296 acpi_ex_load_op(union acpi_operand_object *obj_desc, 297 union acpi_operand_object *target, 298 struct acpi_walk_state *walk_state) 299 { 300 union acpi_operand_object *ddb_handle; 301 struct acpi_table_header *table_header; 302 struct acpi_table_header *table; 303 u32 table_index; 304 acpi_status status; 305 u32 length; 306 307 ACPI_FUNCTION_TRACE(ex_load_op); 308 309 /* Source Object can be either an op_region or a Buffer/Field */ 310 311 switch (obj_desc->common.type) { 312 case ACPI_TYPE_REGION: 313 314 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, 315 "Load table from Region %p\n", obj_desc)); 316 317 /* Region must be system_memory (from ACPI spec) */ 318 319 if (obj_desc->region.space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY) { 320 return_ACPI_STATUS(AE_AML_OPERAND_TYPE); 321 } 322 323 /* 324 * If the Region Address and Length have not been previously 325 * evaluated, evaluate them now and save the results. 326 */ 327 if (!(obj_desc->common.flags & AOPOBJ_DATA_VALID)) { 328 status = acpi_ds_get_region_arguments(obj_desc); 329 if (ACPI_FAILURE(status)) { 330 return_ACPI_STATUS(status); 331 } 332 } 333 334 /* Get the table header first so we can get the table length */ 335 336 table_header = ACPI_ALLOCATE(sizeof(struct acpi_table_header)); 337 if (!table_header) { 338 return_ACPI_STATUS(AE_NO_MEMORY); 339 } 340 341 status = 342 acpi_ex_region_read(obj_desc, 343 sizeof(struct acpi_table_header), 344 ACPI_CAST_PTR(u8, table_header)); 345 length = table_header->length; 346 ACPI_FREE(table_header); 347 348 if (ACPI_FAILURE(status)) { 349 return_ACPI_STATUS(status); 350 } 351 352 /* Must have at least an ACPI table header */ 353 354 if (length < sizeof(struct acpi_table_header)) { 355 return_ACPI_STATUS(AE_INVALID_TABLE_LENGTH); 356 } 357 358 /* 359 * The original implementation simply mapped the table, with no copy. 360 * However, the memory region is not guaranteed to remain stable and 361 * we must copy the table to a local buffer. For example, the memory 362 * region is corrupted after suspend on some machines. Dynamically 363 * loaded tables are usually small, so this overhead is minimal. 364 * 365 * The latest implementation (5/2009) does not use a mapping at all. 366 * We use the low-level operation region interface to read the table 367 * instead of the obvious optimization of using a direct mapping. 368 * This maintains a consistent use of operation regions across the 369 * entire subsystem. This is important if additional processing must 370 * be performed in the (possibly user-installed) operation region 371 * handler. For example, acpi_exec and ASLTS depend on this. 372 */ 373 374 /* Allocate a buffer for the table */ 375 376 table = ACPI_ALLOCATE(length); 377 if (!table) { 378 return_ACPI_STATUS(AE_NO_MEMORY); 379 } 380 381 /* Read the entire table */ 382 383 status = acpi_ex_region_read(obj_desc, length, 384 ACPI_CAST_PTR(u8, table)); 385 if (ACPI_FAILURE(status)) { 386 ACPI_FREE(table); 387 return_ACPI_STATUS(status); 388 } 389 break; 390 391 case ACPI_TYPE_BUFFER: /* Buffer or resolved region_field */ 392 393 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, 394 "Load table from Buffer or Field %p\n", 395 obj_desc)); 396 397 /* Must have at least an ACPI table header */ 398 399 if (obj_desc->buffer.length < sizeof(struct acpi_table_header)) { 400 return_ACPI_STATUS(AE_INVALID_TABLE_LENGTH); 401 } 402 403 /* Get the actual table length from the table header */ 404 405 table_header = 406 ACPI_CAST_PTR(struct acpi_table_header, 407 obj_desc->buffer.pointer); 408 length = table_header->length; 409 410 /* Table cannot extend beyond the buffer */ 411 412 if (length > obj_desc->buffer.length) { 413 return_ACPI_STATUS(AE_AML_BUFFER_LIMIT); 414 } 415 if (length < sizeof(struct acpi_table_header)) { 416 return_ACPI_STATUS(AE_INVALID_TABLE_LENGTH); 417 } 418 419 /* 420 * Copy the table from the buffer because the buffer could be 421 * modified or even deleted in the future 422 */ 423 table = ACPI_ALLOCATE(length); 424 if (!table) { 425 return_ACPI_STATUS(AE_NO_MEMORY); 426 } 427 428 memcpy(table, table_header, length); 429 break; 430 431 default: 432 433 return_ACPI_STATUS(AE_AML_OPERAND_TYPE); 434 } 435 436 /* Install the new table into the local data structures */ 437 438 ACPI_INFO(("Dynamic OEM Table Load:")); 439 acpi_ex_exit_interpreter(); 440 status = acpi_tb_install_and_load_table(ACPI_PTR_TO_PHYSADDR(table), 441 ACPI_TABLE_ORIGIN_INTERNAL_VIRTUAL, 442 TRUE, &table_index); 443 acpi_ex_enter_interpreter(); 444 if (ACPI_FAILURE(status)) { 445 446 /* Delete allocated table buffer */ 447 448 ACPI_FREE(table); 449 return_ACPI_STATUS(status); 450 } 451 452 /* 453 * Add the table to the namespace. 454 * 455 * Note: Load the table objects relative to the root of the namespace. 456 * This appears to go against the ACPI specification, but we do it for 457 * compatibility with other ACPI implementations. 458 */ 459 status = acpi_ex_add_table(table_index, &ddb_handle); 460 if (ACPI_FAILURE(status)) { 461 462 /* On error, table_ptr was deallocated above */ 463 464 return_ACPI_STATUS(status); 465 } 466 467 /* Store the ddb_handle into the Target operand */ 468 469 status = acpi_ex_store(ddb_handle, target, walk_state); 470 if (ACPI_FAILURE(status)) { 471 (void)acpi_ex_unload_table(ddb_handle); 472 473 /* table_ptr was deallocated above */ 474 475 acpi_ut_remove_reference(ddb_handle); 476 return_ACPI_STATUS(status); 477 } 478 479 /* Remove the reference by added by acpi_ex_store above */ 480 481 acpi_ut_remove_reference(ddb_handle); 482 return_ACPI_STATUS(status); 483 } 484 485 /******************************************************************************* 486 * 487 * FUNCTION: acpi_ex_unload_table 488 * 489 * PARAMETERS: ddb_handle - Handle to a previously loaded table 490 * 491 * RETURN: Status 492 * 493 * DESCRIPTION: Unload an ACPI table 494 * 495 ******************************************************************************/ 496 497 acpi_status acpi_ex_unload_table(union acpi_operand_object *ddb_handle) 498 { 499 acpi_status status = AE_OK; 500 union acpi_operand_object *table_desc = ddb_handle; 501 u32 table_index; 502 503 ACPI_FUNCTION_TRACE(ex_unload_table); 504 505 /* 506 * Temporarily emit a warning so that the ASL for the machine can be 507 * hopefully obtained. This is to say that the Unload() operator is 508 * extremely rare if not completely unused. 509 */ 510 ACPI_WARNING((AE_INFO, "Received request to unload an ACPI table")); 511 512 /* 513 * Validate the handle 514 * Although the handle is partially validated in acpi_ex_reconfiguration() 515 * when it calls acpi_ex_resolve_operands(), the handle is more completely 516 * validated here. 517 * 518 * Handle must be a valid operand object of type reference. Also, the 519 * ddb_handle must still be marked valid (table has not been previously 520 * unloaded) 521 */ 522 if ((!ddb_handle) || 523 (ACPI_GET_DESCRIPTOR_TYPE(ddb_handle) != ACPI_DESC_TYPE_OPERAND) || 524 (ddb_handle->common.type != ACPI_TYPE_LOCAL_REFERENCE) || 525 (!(ddb_handle->common.flags & AOPOBJ_DATA_VALID))) { 526 return_ACPI_STATUS(AE_AML_OPERAND_TYPE); 527 } 528 529 /* Get the table index from the ddb_handle */ 530 531 table_index = table_desc->reference.value; 532 533 /* 534 * Release the interpreter lock so that the table lock won't have 535 * strict order requirement against it. 536 */ 537 acpi_ex_exit_interpreter(); 538 status = acpi_tb_unload_table(table_index); 539 acpi_ex_enter_interpreter(); 540 541 /* 542 * Invalidate the handle. We do this because the handle may be stored 543 * in a named object and may not be actually deleted until much later. 544 */ 545 if (ACPI_SUCCESS(status)) { 546 ddb_handle->common.flags &= ~AOPOBJ_DATA_VALID; 547 } 548 return_ACPI_STATUS(status); 549 } 550