1 // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 2 /****************************************************************************** 3 * 4 * Module Name: dswload - Dispatcher first pass namespace load callbacks 5 * 6 * Copyright (C) 2000 - 2020, Intel Corp. 7 * 8 *****************************************************************************/ 9 10 #include <acpi/acpi.h> 11 #include "accommon.h" 12 #include "acparser.h" 13 #include "amlcode.h" 14 #include "acdispat.h" 15 #include "acinterp.h" 16 #include "acnamesp.h" 17 #ifdef ACPI_ASL_COMPILER 18 #include "acdisasm.h" 19 #endif 20 21 #define _COMPONENT ACPI_DISPATCHER 22 ACPI_MODULE_NAME("dswload") 23 24 /******************************************************************************* 25 * 26 * FUNCTION: acpi_ds_init_callbacks 27 * 28 * PARAMETERS: walk_state - Current state of the parse tree walk 29 * pass_number - 1, 2, or 3 30 * 31 * RETURN: Status 32 * 33 * DESCRIPTION: Init walk state callbacks 34 * 35 ******************************************************************************/ 36 acpi_status 37 acpi_ds_init_callbacks(struct acpi_walk_state *walk_state, u32 pass_number) 38 { 39 40 switch (pass_number) { 41 case 0: 42 43 /* Parse only - caller will setup callbacks */ 44 45 walk_state->parse_flags = ACPI_PARSE_LOAD_PASS1 | 46 ACPI_PARSE_DELETE_TREE | ACPI_PARSE_DISASSEMBLE; 47 walk_state->descending_callback = NULL; 48 walk_state->ascending_callback = NULL; 49 break; 50 51 case 1: 52 53 /* Load pass 1 */ 54 55 walk_state->parse_flags = ACPI_PARSE_LOAD_PASS1 | 56 ACPI_PARSE_DELETE_TREE; 57 walk_state->descending_callback = acpi_ds_load1_begin_op; 58 walk_state->ascending_callback = acpi_ds_load1_end_op; 59 break; 60 61 case 2: 62 63 /* Load pass 2 */ 64 65 walk_state->parse_flags = ACPI_PARSE_LOAD_PASS1 | 66 ACPI_PARSE_DELETE_TREE; 67 walk_state->descending_callback = acpi_ds_load2_begin_op; 68 walk_state->ascending_callback = acpi_ds_load2_end_op; 69 break; 70 71 case 3: 72 73 /* Execution pass */ 74 75 walk_state->parse_flags |= ACPI_PARSE_EXECUTE | 76 ACPI_PARSE_DELETE_TREE; 77 walk_state->descending_callback = acpi_ds_exec_begin_op; 78 walk_state->ascending_callback = acpi_ds_exec_end_op; 79 break; 80 81 default: 82 83 return (AE_BAD_PARAMETER); 84 } 85 86 return (AE_OK); 87 } 88 89 /******************************************************************************* 90 * 91 * FUNCTION: acpi_ds_load1_begin_op 92 * 93 * PARAMETERS: walk_state - Current state of the parse tree walk 94 * out_op - Where to return op if a new one is created 95 * 96 * RETURN: Status 97 * 98 * DESCRIPTION: Descending callback used during the loading of ACPI tables. 99 * 100 ******************************************************************************/ 101 102 acpi_status 103 acpi_ds_load1_begin_op(struct acpi_walk_state *walk_state, 104 union acpi_parse_object **out_op) 105 { 106 union acpi_parse_object *op; 107 struct acpi_namespace_node *node; 108 acpi_status status; 109 acpi_object_type object_type; 110 char *path; 111 u32 flags; 112 113 ACPI_FUNCTION_TRACE_PTR(ds_load1_begin_op, walk_state->op); 114 115 op = walk_state->op; 116 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "Op=%p State=%p\n", op, 117 walk_state)); 118 119 /* We are only interested in opcodes that have an associated name */ 120 121 if (op) { 122 if (!(walk_state->op_info->flags & AML_NAMED)) { 123 *out_op = op; 124 return_ACPI_STATUS(AE_OK); 125 } 126 127 /* Check if this object has already been installed in the namespace */ 128 129 if (op->common.node) { 130 *out_op = op; 131 return_ACPI_STATUS(AE_OK); 132 } 133 } 134 135 path = acpi_ps_get_next_namestring(&walk_state->parser_state); 136 137 /* Map the raw opcode into an internal object type */ 138 139 object_type = walk_state->op_info->object_type; 140 141 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, 142 "State=%p Op=%p [%s]\n", walk_state, op, 143 acpi_ut_get_type_name(object_type))); 144 145 switch (walk_state->opcode) { 146 case AML_SCOPE_OP: 147 /* 148 * The target name of the Scope() operator must exist at this point so 149 * that we can actually open the scope to enter new names underneath it. 150 * Allow search-to-root for single namesegs. 151 */ 152 status = 153 acpi_ns_lookup(walk_state->scope_info, path, object_type, 154 ACPI_IMODE_EXECUTE, ACPI_NS_SEARCH_PARENT, 155 walk_state, &(node)); 156 #ifdef ACPI_ASL_COMPILER 157 if (status == AE_NOT_FOUND) { 158 /* 159 * Table disassembly: 160 * Target of Scope() not found. Generate an External for it, and 161 * insert the name into the namespace. 162 */ 163 acpi_dm_add_op_to_external_list(op, path, 164 ACPI_TYPE_DEVICE, 0, 0); 165 status = 166 acpi_ns_lookup(walk_state->scope_info, path, 167 object_type, ACPI_IMODE_LOAD_PASS1, 168 ACPI_NS_SEARCH_PARENT, walk_state, 169 &node); 170 } 171 #endif 172 if (ACPI_FAILURE(status)) { 173 ACPI_ERROR_NAMESPACE(walk_state->scope_info, path, 174 status); 175 return_ACPI_STATUS(status); 176 } 177 178 /* 179 * Check to make sure that the target is 180 * one of the opcodes that actually opens a scope 181 */ 182 switch (node->type) { 183 case ACPI_TYPE_ANY: 184 case ACPI_TYPE_LOCAL_SCOPE: /* Scope */ 185 case ACPI_TYPE_DEVICE: 186 case ACPI_TYPE_POWER: 187 case ACPI_TYPE_PROCESSOR: 188 case ACPI_TYPE_THERMAL: 189 190 /* These are acceptable types */ 191 break; 192 193 case ACPI_TYPE_INTEGER: 194 case ACPI_TYPE_STRING: 195 case ACPI_TYPE_BUFFER: 196 /* 197 * These types we will allow, but we will change the type. 198 * This enables some existing code of the form: 199 * 200 * Name (DEB, 0) 201 * Scope (DEB) { ... } 202 * 203 * Note: silently change the type here. On the second pass, 204 * we will report a warning 205 */ 206 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 207 "Type override - [%4.4s] had invalid type (%s) " 208 "for Scope operator, changed to type ANY\n", 209 acpi_ut_get_node_name(node), 210 acpi_ut_get_type_name(node->type))); 211 212 node->type = ACPI_TYPE_ANY; 213 walk_state->scope_info->common.value = ACPI_TYPE_ANY; 214 break; 215 216 case ACPI_TYPE_METHOD: 217 /* 218 * Allow scope change to root during execution of module-level 219 * code. Root is typed METHOD during this time. 220 */ 221 if ((node == acpi_gbl_root_node) && 222 (walk_state-> 223 parse_flags & ACPI_PARSE_MODULE_LEVEL)) { 224 break; 225 } 226 227 /*lint -fallthrough */ 228 229 default: 230 231 /* All other types are an error */ 232 233 ACPI_ERROR((AE_INFO, 234 "Invalid type (%s) for target of " 235 "Scope operator [%4.4s] (Cannot override)", 236 acpi_ut_get_type_name(node->type), 237 acpi_ut_get_node_name(node))); 238 239 return_ACPI_STATUS(AE_AML_OPERAND_TYPE); 240 } 241 break; 242 243 default: 244 /* 245 * For all other named opcodes, we will enter the name into 246 * the namespace. 247 * 248 * Setup the search flags. 249 * Since we are entering a name into the namespace, we do not want to 250 * enable the search-to-root upsearch. 251 * 252 * There are only two conditions where it is acceptable that the name 253 * already exists: 254 * 1) the Scope() operator can reopen a scoping object that was 255 * previously defined (Scope, Method, Device, etc.) 256 * 2) Whenever we are parsing a deferred opcode (op_region, Buffer, 257 * buffer_field, or Package), the name of the object is already 258 * in the namespace. 259 */ 260 if (walk_state->deferred_node) { 261 262 /* This name is already in the namespace, get the node */ 263 264 node = walk_state->deferred_node; 265 status = AE_OK; 266 break; 267 } 268 269 /* 270 * If we are executing a method, do not create any namespace objects 271 * during the load phase, only during execution. 272 */ 273 if (walk_state->method_node) { 274 node = NULL; 275 status = AE_OK; 276 break; 277 } 278 279 flags = ACPI_NS_NO_UPSEARCH; 280 if ((walk_state->opcode != AML_SCOPE_OP) && 281 (!(walk_state->parse_flags & ACPI_PARSE_DEFERRED_OP))) { 282 if (walk_state->namespace_override) { 283 flags |= ACPI_NS_OVERRIDE_IF_FOUND; 284 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, 285 "[%s] Override allowed\n", 286 acpi_ut_get_type_name 287 (object_type))); 288 } else { 289 flags |= ACPI_NS_ERROR_IF_FOUND; 290 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, 291 "[%s] Cannot already exist\n", 292 acpi_ut_get_type_name 293 (object_type))); 294 } 295 } else { 296 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, 297 "[%s] Both Find or Create allowed\n", 298 acpi_ut_get_type_name(object_type))); 299 } 300 301 /* 302 * Enter the named type into the internal namespace. We enter the name 303 * as we go downward in the parse tree. Any necessary subobjects that 304 * involve arguments to the opcode must be created as we go back up the 305 * parse tree later. 306 */ 307 status = 308 acpi_ns_lookup(walk_state->scope_info, path, object_type, 309 ACPI_IMODE_LOAD_PASS1, flags, walk_state, 310 &node); 311 if (ACPI_FAILURE(status)) { 312 if (status == AE_ALREADY_EXISTS) { 313 314 /* The name already exists in this scope */ 315 316 if (node->flags & ANOBJ_IS_EXTERNAL) { 317 /* 318 * Allow one create on an object or segment that was 319 * previously declared External 320 */ 321 node->flags &= ~ANOBJ_IS_EXTERNAL; 322 node->type = (u8) object_type; 323 324 /* Just retyped a node, probably will need to open a scope */ 325 326 if (acpi_ns_opens_scope(object_type)) { 327 status = 328 acpi_ds_scope_stack_push 329 (node, object_type, 330 walk_state); 331 if (ACPI_FAILURE(status)) { 332 return_ACPI_STATUS 333 (status); 334 } 335 } 336 337 status = AE_OK; 338 } 339 } 340 341 if (ACPI_FAILURE(status)) { 342 ACPI_ERROR_NAMESPACE(walk_state->scope_info, 343 path, status); 344 return_ACPI_STATUS(status); 345 } 346 } 347 break; 348 } 349 350 /* Common exit */ 351 352 if (!op) { 353 354 /* Create a new op */ 355 356 op = acpi_ps_alloc_op(walk_state->opcode, walk_state->aml); 357 if (!op) { 358 return_ACPI_STATUS(AE_NO_MEMORY); 359 } 360 } 361 362 /* Initialize the op */ 363 364 #ifdef ACPI_CONSTANT_EVAL_ONLY 365 op->named.path = path; 366 #endif 367 368 if (node) { 369 /* 370 * Put the Node in the "op" object that the parser uses, so we 371 * can get it again quickly when this scope is closed 372 */ 373 op->common.node = node; 374 op->named.name = node->name.integer; 375 } 376 377 acpi_ps_append_arg(acpi_ps_get_parent_scope(&walk_state->parser_state), 378 op); 379 *out_op = op; 380 return_ACPI_STATUS(status); 381 } 382 383 /******************************************************************************* 384 * 385 * FUNCTION: acpi_ds_load1_end_op 386 * 387 * PARAMETERS: walk_state - Current state of the parse tree walk 388 * 389 * RETURN: Status 390 * 391 * DESCRIPTION: Ascending callback used during the loading of the namespace, 392 * both control methods and everything else. 393 * 394 ******************************************************************************/ 395 396 acpi_status acpi_ds_load1_end_op(struct acpi_walk_state *walk_state) 397 { 398 union acpi_parse_object *op; 399 acpi_object_type object_type; 400 acpi_status status = AE_OK; 401 #ifdef ACPI_ASL_COMPILER 402 u8 param_count; 403 #endif 404 405 ACPI_FUNCTION_TRACE(ds_load1_end_op); 406 407 op = walk_state->op; 408 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "Op=%p State=%p\n", op, 409 walk_state)); 410 411 /* 412 * Disassembler: handle create field operators here. 413 * 414 * create_buffer_field is a deferred op that is typically processed in load 415 * pass 2. However, disassembly of control method contents walk the parse 416 * tree with ACPI_PARSE_LOAD_PASS1 and AML_CREATE operators are processed 417 * in a later walk. This is a problem when there is a control method that 418 * has the same name as the AML_CREATE object. In this case, any use of the 419 * name segment will be detected as a method call rather than a reference 420 * to a buffer field. 421 * 422 * This earlier creation during disassembly solves this issue by inserting 423 * the named object in the ACPI namespace so that references to this name 424 * would be a name string rather than a method call. 425 */ 426 if ((walk_state->parse_flags & ACPI_PARSE_DISASSEMBLE) && 427 (walk_state->op_info->flags & AML_CREATE)) { 428 status = acpi_ds_create_buffer_field(op, walk_state); 429 return_ACPI_STATUS(status); 430 } 431 432 /* We are only interested in opcodes that have an associated name */ 433 434 if (!(walk_state->op_info->flags & (AML_NAMED | AML_FIELD))) { 435 return_ACPI_STATUS(AE_OK); 436 } 437 438 /* Get the object type to determine if we should pop the scope */ 439 440 object_type = walk_state->op_info->object_type; 441 442 if (walk_state->op_info->flags & AML_FIELD) { 443 /* 444 * If we are executing a method, do not create any namespace objects 445 * during the load phase, only during execution. 446 */ 447 if (!walk_state->method_node) { 448 if (walk_state->opcode == AML_FIELD_OP || 449 walk_state->opcode == AML_BANK_FIELD_OP || 450 walk_state->opcode == AML_INDEX_FIELD_OP) { 451 status = 452 acpi_ds_init_field_objects(op, walk_state); 453 } 454 } 455 return_ACPI_STATUS(status); 456 } 457 458 /* 459 * If we are executing a method, do not create any namespace objects 460 * during the load phase, only during execution. 461 */ 462 if (!walk_state->method_node) { 463 if (op->common.aml_opcode == AML_REGION_OP) { 464 status = 465 acpi_ex_create_region(op->named.data, 466 op->named.length, 467 (acpi_adr_space_type) 468 ((op->common.value.arg)-> 469 common.value.integer), 470 walk_state); 471 if (ACPI_FAILURE(status)) { 472 return_ACPI_STATUS(status); 473 } 474 } else if (op->common.aml_opcode == AML_DATA_REGION_OP) { 475 status = 476 acpi_ex_create_region(op->named.data, 477 op->named.length, 478 ACPI_ADR_SPACE_DATA_TABLE, 479 walk_state); 480 if (ACPI_FAILURE(status)) { 481 return_ACPI_STATUS(status); 482 } 483 } 484 } 485 486 if (op->common.aml_opcode == AML_NAME_OP) { 487 488 /* For Name opcode, get the object type from the argument */ 489 490 if (op->common.value.arg) { 491 object_type = (acpi_ps_get_opcode_info((op->common. 492 value.arg)-> 493 common. 494 aml_opcode))-> 495 object_type; 496 497 /* Set node type if we have a namespace node */ 498 499 if (op->common.node) { 500 op->common.node->type = (u8) object_type; 501 } 502 } 503 } 504 #ifdef ACPI_ASL_COMPILER 505 /* 506 * For external opcode, get the object type from the argument and 507 * get the parameter count from the argument's next. 508 */ 509 if (acpi_gbl_disasm_flag && 510 op->common.node && op->common.aml_opcode == AML_EXTERNAL_OP) { 511 /* 512 * Note, if this external is not a method 513 * Op->Common.Value.Arg->Common.Next->Common.Value.Integer == 0 514 * Therefore, param_count will be 0. 515 */ 516 param_count = 517 (u8)op->common.value.arg->common.next->common.value.integer; 518 object_type = (u8)op->common.value.arg->common.value.integer; 519 op->common.node->flags |= ANOBJ_IS_EXTERNAL; 520 op->common.node->type = (u8)object_type; 521 522 acpi_dm_create_subobject_for_external((u8)object_type, 523 &op->common.node, 524 param_count); 525 526 /* 527 * Add the external to the external list because we may be 528 * emitting code based off of the items within the external list. 529 */ 530 acpi_dm_add_op_to_external_list(op, op->named.path, 531 (u8)object_type, param_count, 532 ACPI_EXT_ORIGIN_FROM_OPCODE | 533 ACPI_EXT_RESOLVED_REFERENCE); 534 } 535 #endif 536 537 /* 538 * If we are executing a method, do not create any namespace objects 539 * during the load phase, only during execution. 540 */ 541 if (!walk_state->method_node) { 542 if (op->common.aml_opcode == AML_METHOD_OP) { 543 /* 544 * method_op pkg_length name_string method_flags term_list 545 * 546 * Note: We must create the method node/object pair as soon as we 547 * see the method declaration. This allows later pass1 parsing 548 * of invocations of the method (need to know the number of 549 * arguments.) 550 */ 551 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, 552 "LOADING-Method: State=%p Op=%p NamedObj=%p\n", 553 walk_state, op, op->named.node)); 554 555 if (!acpi_ns_get_attached_object(op->named.node)) { 556 walk_state->operands[0] = 557 ACPI_CAST_PTR(void, op->named.node); 558 walk_state->num_operands = 1; 559 560 status = 561 acpi_ds_create_operands(walk_state, 562 op->common.value. 563 arg); 564 if (ACPI_SUCCESS(status)) { 565 status = 566 acpi_ex_create_method(op->named. 567 data, 568 op->named. 569 length, 570 walk_state); 571 } 572 573 walk_state->operands[0] = NULL; 574 walk_state->num_operands = 0; 575 576 if (ACPI_FAILURE(status)) { 577 return_ACPI_STATUS(status); 578 } 579 } 580 } 581 } 582 583 /* Pop the scope stack (only if loading a table) */ 584 585 if (!walk_state->method_node && 586 op->common.aml_opcode != AML_EXTERNAL_OP && 587 acpi_ns_opens_scope(object_type)) { 588 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, 589 "(%s): Popping scope for Op %p\n", 590 acpi_ut_get_type_name(object_type), op)); 591 592 status = acpi_ds_scope_stack_pop(walk_state); 593 } 594 595 return_ACPI_STATUS(status); 596 } 597