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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 | /******************************************************************************* * * Module Name: nseval - Object evaluation interfaces -- includes control * method lookup and execution. * ******************************************************************************/ /* * Copyright (C) 2000 - 2006, R. Byron Moore * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions, and the following disclaimer, * without modification. * 2. Redistributions in binary form must reproduce at minimum a disclaimer * substantially similar to the "NO WARRANTY" disclaimer below * ("Disclaimer") and any redistribution must be conditioned upon * including a substantially similar Disclaimer requirement for further * binary redistribution. * 3. Neither the names of the above-listed copyright holders nor the names * of any contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * Alternatively, this software may be distributed under the terms of the * GNU General Public License ("GPL") version 2 as published by the Free * Software Foundation. * * NO WARRANTY * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGES. */ #include <acpi/acpi.h> #include <acpi/acparser.h> #include <acpi/acinterp.h> #include <acpi/acnamesp.h> #define _COMPONENT ACPI_NAMESPACE ACPI_MODULE_NAME("nseval") /* Local prototypes */ static acpi_status acpi_ns_execute_control_method(struct acpi_parameter_info *info); static acpi_status acpi_ns_get_object_value(struct acpi_parameter_info *info); /******************************************************************************* * * FUNCTION: acpi_ns_evaluate_relative * * PARAMETERS: Pathname - Name of method to execute, If NULL, the * handle is the object to execute * Info - Method info block, contains: * return_object - Where to put method's return value (if * any). If NULL, no value is returned. * Params - List of parameters to pass to the method, * terminated by NULL. Params itself may be * NULL if no parameters are being passed. * * RETURN: Status * * DESCRIPTION: Evaluate the object or find and execute the requested method * * MUTEX: Locks Namespace * ******************************************************************************/ acpi_status acpi_ns_evaluate_relative(char *pathname, struct acpi_parameter_info *info) { acpi_status status; struct acpi_namespace_node *node = NULL; union acpi_generic_state *scope_info; char *internal_path = NULL; ACPI_FUNCTION_TRACE("ns_evaluate_relative"); /* * Must have a valid object handle */ if (!info || !info->node) { return_ACPI_STATUS(AE_BAD_PARAMETER); } /* Build an internal name string for the method */ status = acpi_ns_internalize_name(pathname, &internal_path); if (ACPI_FAILURE(status)) { return_ACPI_STATUS(status); } scope_info = acpi_ut_create_generic_state(); if (!scope_info) { goto cleanup1; } /* Get the prefix handle and Node */ status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); if (ACPI_FAILURE(status)) { goto cleanup; } info->node = acpi_ns_map_handle_to_node(info->node); if (!info->node) { (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); status = AE_BAD_PARAMETER; goto cleanup; } /* Lookup the name in the namespace */ scope_info->scope.node = info->node; status = acpi_ns_lookup(scope_info, internal_path, ACPI_TYPE_ANY, ACPI_IMODE_EXECUTE, ACPI_NS_NO_UPSEARCH, NULL, &node); (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); if (ACPI_FAILURE(status)) { ACPI_DEBUG_PRINT((ACPI_DB_NAMES, "Object [%s] not found [%s]\n", pathname, acpi_format_exception(status))); goto cleanup; } /* * Now that we have a handle to the object, we can attempt to evaluate it. */ ACPI_DEBUG_PRINT((ACPI_DB_NAMES, "%s [%p] Value %p\n", pathname, node, acpi_ns_get_attached_object(node))); info->node = node; status = acpi_ns_evaluate_by_handle(info); ACPI_DEBUG_PRINT((ACPI_DB_NAMES, "*** Completed eval of object %s ***\n", pathname)); cleanup: acpi_ut_delete_generic_state(scope_info); cleanup1: ACPI_MEM_FREE(internal_path); return_ACPI_STATUS(status); } /******************************************************************************* * * FUNCTION: acpi_ns_evaluate_by_name * * PARAMETERS: Pathname - Fully qualified pathname to the object * Info - Method info block, contains: * return_object - Where to put method's return value (if * any). If NULL, no value is returned. * Params - List of parameters to pass to the method, * terminated by NULL. Params itself may be * NULL if no parameters are being passed. * * RETURN: Status * * DESCRIPTION: Evaluate the object or rind and execute the requested method * passing the given parameters * * MUTEX: Locks Namespace * ******************************************************************************/ acpi_status acpi_ns_evaluate_by_name(char *pathname, struct acpi_parameter_info *info) { acpi_status status; char *internal_path = NULL; ACPI_FUNCTION_TRACE("ns_evaluate_by_name"); /* Build an internal name string for the method */ status = acpi_ns_internalize_name(pathname, &internal_path); if (ACPI_FAILURE(status)) { return_ACPI_STATUS(status); } status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); if (ACPI_FAILURE(status)) { goto cleanup; } /* Lookup the name in the namespace */ status = acpi_ns_lookup(NULL, internal_path, ACPI_TYPE_ANY, ACPI_IMODE_EXECUTE, ACPI_NS_NO_UPSEARCH, NULL, &info->node); (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); if (ACPI_FAILURE(status)) { ACPI_DEBUG_PRINT((ACPI_DB_NAMES, "Object at [%s] was not found, status=%.4X\n", pathname, status)); goto cleanup; } /* * Now that we have a handle to the object, we can attempt to evaluate it. */ ACPI_DEBUG_PRINT((ACPI_DB_NAMES, "%s [%p] Value %p\n", pathname, info->node, acpi_ns_get_attached_object(info->node))); status = acpi_ns_evaluate_by_handle(info); ACPI_DEBUG_PRINT((ACPI_DB_NAMES, "*** Completed eval of object %s ***\n", pathname)); cleanup: /* Cleanup */ if (internal_path) { ACPI_MEM_FREE(internal_path); } return_ACPI_STATUS(status); } /******************************************************************************* * * FUNCTION: acpi_ns_evaluate_by_handle * * PARAMETERS: Info - Method info block, contains: * Node - Method/Object Node to execute * Parameters - List of parameters to pass to the method, * terminated by NULL. Params itself may be * NULL if no parameters are being passed. * return_object - Where to put method's return value (if * any). If NULL, no value is returned. * parameter_type - Type of Parameter list * return_object - Where to put method's return value (if * any). If NULL, no value is returned. * * RETURN: Status * * DESCRIPTION: Evaluate object or execute the requested method passing the * given parameters * * MUTEX: Locks Namespace * ******************************************************************************/ acpi_status acpi_ns_evaluate_by_handle(struct acpi_parameter_info *info) { acpi_status status; ACPI_FUNCTION_TRACE("ns_evaluate_by_handle"); /* Check if namespace has been initialized */ if (!acpi_gbl_root_node) { return_ACPI_STATUS(AE_NO_NAMESPACE); } /* Parameter Validation */ if (!info) { return_ACPI_STATUS(AE_BAD_PARAMETER); } /* Initialize the return value to an invalid object */ info->return_object = NULL; /* Get the prefix handle and Node */ status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); if (ACPI_FAILURE(status)) { return_ACPI_STATUS(status); } info->node = acpi_ns_map_handle_to_node(info->node); if (!info->node) { (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); return_ACPI_STATUS(AE_BAD_PARAMETER); } /* * For a method alias, we must grab the actual method node so that proper * scoping context will be established before execution. */ if (acpi_ns_get_type(info->node) == ACPI_TYPE_LOCAL_METHOD_ALIAS) { info->node = ACPI_CAST_PTR(struct acpi_namespace_node, info->node->object); } /* * Two major cases here: * 1) The object is an actual control method -- execute it. * 2) The object is not a method -- just return it's current value * * In both cases, the namespace is unlocked by the acpi_ns* procedure */ if (acpi_ns_get_type(info->node) == ACPI_TYPE_METHOD) { /* * Case 1) We have an actual control method to execute */ status = acpi_ns_execute_control_method(info); } else { /* * Case 2) Object is NOT a method, just return its current value */ status = acpi_ns_get_object_value(info); } /* * Check if there is a return value on the stack that must be dealt with */ if (status == AE_CTRL_RETURN_VALUE) { /* Map AE_CTRL_RETURN_VALUE to AE_OK, we are done with it */ status = AE_OK; } /* * Namespace was unlocked by the handling acpi_ns* function, so we * just return */ return_ACPI_STATUS(status); } /******************************************************************************* * * FUNCTION: acpi_ns_execute_control_method * * PARAMETERS: Info - Method info block, contains: * Node - Method Node to execute * obj_desc - Method object * Parameters - List of parameters to pass to the method, * terminated by NULL. Params itself may be * NULL if no parameters are being passed. * return_object - Where to put method's return value (if * any). If NULL, no value is returned. * parameter_type - Type of Parameter list * return_object - Where to put method's return value (if * any). If NULL, no value is returned. * * RETURN: Status * * DESCRIPTION: Execute the requested method passing the given parameters * * MUTEX: Assumes namespace is locked * ******************************************************************************/ static acpi_status acpi_ns_execute_control_method(struct acpi_parameter_info *info) { acpi_status status; ACPI_FUNCTION_TRACE("ns_execute_control_method"); /* Verify that there is a method associated with this object */ info->obj_desc = acpi_ns_get_attached_object(info->node); if (!info->obj_desc) { ACPI_ERROR((AE_INFO, "No attached method object")); (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); return_ACPI_STATUS(AE_NULL_OBJECT); } ACPI_DUMP_PATHNAME(info->node, "Execute Method:", ACPI_LV_INFO, _COMPONENT); ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Method at AML address %p Length %X\n", info->obj_desc->method.aml_start + 1, info->obj_desc->method.aml_length - 1)); /* * Unlock the namespace before execution. This allows namespace access * via the external Acpi* interfaces while a method is being executed. * However, any namespace deletion must acquire both the namespace and * interpreter locks to ensure that no thread is using the portion of the * namespace that is being deleted. */ status = acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); if (ACPI_FAILURE(status)) { return_ACPI_STATUS(status); } /* * Execute the method via the interpreter. The interpreter is locked * here before calling into the AML parser */ status = acpi_ex_enter_interpreter(); if (ACPI_FAILURE(status)) { return_ACPI_STATUS(status); } status = acpi_ps_execute_method(info); acpi_ex_exit_interpreter(); return_ACPI_STATUS(status); } /******************************************************************************* * * FUNCTION: acpi_ns_get_object_value * * PARAMETERS: Info - Method info block, contains: * Node - Object's NS node * return_object - Where to put object value (if * any). If NULL, no value is returned. * * RETURN: Status * * DESCRIPTION: Return the current value of the object * * MUTEX: Assumes namespace is locked, leaves namespace unlocked * ******************************************************************************/ static acpi_status acpi_ns_get_object_value(struct acpi_parameter_info *info) { acpi_status status = AE_OK; struct acpi_namespace_node *resolved_node = info->node; ACPI_FUNCTION_TRACE("ns_get_object_value"); /* * Objects require additional resolution steps (e.g., the Node may be a * field that must be read, etc.) -- we can't just grab the object out of * the node. */ /* * Use resolve_node_to_value() to get the associated value. This call always * deletes obj_desc (allocated above). * * NOTE: we can get away with passing in NULL for a walk state because * obj_desc is guaranteed to not be a reference to either a method local or * a method argument (because this interface can only be called from the * acpi_evaluate external interface, never called from a running method.) * * Even though we do not directly invoke the interpreter for this, we must * enter it because we could access an opregion. The opregion access code * assumes that the interpreter is locked. * * We must release the namespace lock before entering the intepreter. */ status = acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); if (ACPI_FAILURE(status)) { return_ACPI_STATUS(status); } status = acpi_ex_enter_interpreter(); if (ACPI_SUCCESS(status)) { status = acpi_ex_resolve_node_to_value(&resolved_node, NULL); /* * If acpi_ex_resolve_node_to_value() succeeded, the return value was placed * in resolved_node. */ acpi_ex_exit_interpreter(); if (ACPI_SUCCESS(status)) { status = AE_CTRL_RETURN_VALUE; info->return_object = ACPI_CAST_PTR (union acpi_operand_object, resolved_node); ACPI_DEBUG_PRINT((ACPI_DB_NAMES, "Returning object %p [%s]\n", info->return_object, acpi_ut_get_object_type_name(info-> return_object))); } } /* Namespace is unlocked */ return_ACPI_STATUS(status); } |