1 /******************************************************************************* 2 * 3 * Module Name: nseval - Object evaluation, includes control method execution 4 * 5 ******************************************************************************/ 6 7 /* 8 * Copyright (C) 2000 - 2012, 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 "acparser.h" 47 #include "acinterp.h" 48 #include "acnamesp.h" 49 50 #define _COMPONENT ACPI_NAMESPACE 51 ACPI_MODULE_NAME("nseval") 52 53 /* Local prototypes */ 54 static void 55 acpi_ns_exec_module_code(union acpi_operand_object *method_obj, 56 struct acpi_evaluate_info *info); 57 58 /******************************************************************************* 59 * 60 * FUNCTION: acpi_ns_evaluate 61 * 62 * PARAMETERS: info - Evaluation info block, contains: 63 * prefix_node - Prefix or Method/Object Node to execute 64 * pathname - Name of method to execute, If NULL, the 65 * Node is the object to execute 66 * parameters - List of parameters to pass to the method, 67 * terminated by NULL. Params itself may be 68 * NULL if no parameters are being passed. 69 * return_object - Where to put method's return value (if 70 * any). If NULL, no value is returned. 71 * parameter_type - Type of Parameter list 72 * return_object - Where to put method's return value (if 73 * any). If NULL, no value is returned. 74 * flags - ACPI_IGNORE_RETURN_VALUE to delete return 75 * 76 * RETURN: Status 77 * 78 * DESCRIPTION: Execute a control method or return the current value of an 79 * ACPI namespace object. 80 * 81 * MUTEX: Locks interpreter 82 * 83 ******************************************************************************/ 84 85 acpi_status acpi_ns_evaluate(struct acpi_evaluate_info * info) 86 { 87 acpi_status status; 88 struct acpi_namespace_node *node; 89 90 ACPI_FUNCTION_TRACE(ns_evaluate); 91 92 if (!info) { 93 return_ACPI_STATUS(AE_BAD_PARAMETER); 94 } 95 96 /* Initialize the return value to an invalid object */ 97 98 info->return_object = NULL; 99 info->param_count = 0; 100 101 /* 102 * Get the actual namespace node for the target object. Handles these cases: 103 * 104 * 1) Null node, Pathname (absolute path) 105 * 2) Node, Pathname (path relative to Node) 106 * 3) Node, Null Pathname 107 */ 108 status = acpi_ns_get_node(info->prefix_node, info->pathname, 109 ACPI_NS_NO_UPSEARCH, &info->resolved_node); 110 if (ACPI_FAILURE(status)) { 111 return_ACPI_STATUS(status); 112 } 113 114 /* 115 * For a method alias, we must grab the actual method node so that proper 116 * scoping context will be established before execution. 117 */ 118 if (acpi_ns_get_type(info->resolved_node) == 119 ACPI_TYPE_LOCAL_METHOD_ALIAS) { 120 info->resolved_node = 121 ACPI_CAST_PTR(struct acpi_namespace_node, 122 info->resolved_node->object); 123 } 124 125 ACPI_DEBUG_PRINT((ACPI_DB_NAMES, "%s [%p] Value %p\n", info->pathname, 126 info->resolved_node, 127 acpi_ns_get_attached_object(info->resolved_node))); 128 129 node = info->resolved_node; 130 131 /* 132 * Two major cases here: 133 * 134 * 1) The object is a control method -- execute it 135 * 2) The object is not a method -- just return it's current value 136 */ 137 if (acpi_ns_get_type(info->resolved_node) == ACPI_TYPE_METHOD) { 138 /* 139 * 1) Object is a control method - execute it 140 */ 141 142 /* Verify that there is a method object associated with this node */ 143 144 info->obj_desc = 145 acpi_ns_get_attached_object(info->resolved_node); 146 if (!info->obj_desc) { 147 ACPI_ERROR((AE_INFO, 148 "Control method has no attached sub-object")); 149 return_ACPI_STATUS(AE_NULL_OBJECT); 150 } 151 152 /* Count the number of arguments being passed to the method */ 153 154 if (info->parameters) { 155 while (info->parameters[info->param_count]) { 156 if (info->param_count > ACPI_METHOD_MAX_ARG) { 157 return_ACPI_STATUS(AE_LIMIT); 158 } 159 info->param_count++; 160 } 161 } 162 163 164 ACPI_DUMP_PATHNAME(info->resolved_node, "ACPI: Execute Method", 165 ACPI_LV_INFO, _COMPONENT); 166 167 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, 168 "Method at AML address %p Length %X\n", 169 info->obj_desc->method.aml_start + 1, 170 info->obj_desc->method.aml_length - 1)); 171 172 /* 173 * Any namespace deletion must acquire both the namespace and 174 * interpreter locks to ensure that no thread is using the portion of 175 * the namespace that is being deleted. 176 * 177 * Execute the method via the interpreter. The interpreter is locked 178 * here before calling into the AML parser 179 */ 180 acpi_ex_enter_interpreter(); 181 status = acpi_ps_execute_method(info); 182 acpi_ex_exit_interpreter(); 183 } else { 184 /* 185 * 2) Object is not a method, return its current value 186 * 187 * Disallow certain object types. For these, "evaluation" is undefined. 188 */ 189 switch (info->resolved_node->type) { 190 case ACPI_TYPE_DEVICE: 191 case ACPI_TYPE_EVENT: 192 case ACPI_TYPE_MUTEX: 193 case ACPI_TYPE_REGION: 194 case ACPI_TYPE_THERMAL: 195 case ACPI_TYPE_LOCAL_SCOPE: 196 197 ACPI_ERROR((AE_INFO, 198 "[%4.4s] Evaluation of object type [%s] is not supported", 199 info->resolved_node->name.ascii, 200 acpi_ut_get_type_name(info->resolved_node-> 201 type))); 202 203 return_ACPI_STATUS(AE_TYPE); 204 205 default: 206 break; 207 } 208 209 /* 210 * Objects require additional resolution steps (e.g., the Node may be 211 * a field that must be read, etc.) -- we can't just grab the object 212 * out of the node. 213 * 214 * Use resolve_node_to_value() to get the associated value. 215 * 216 * NOTE: we can get away with passing in NULL for a walk state because 217 * resolved_node is guaranteed to not be a reference to either a method 218 * local or a method argument (because this interface is never called 219 * from a running method.) 220 * 221 * Even though we do not directly invoke the interpreter for object 222 * resolution, we must lock it because we could access an opregion. 223 * The opregion access code assumes that the interpreter is locked. 224 */ 225 acpi_ex_enter_interpreter(); 226 227 /* Function has a strange interface */ 228 229 status = 230 acpi_ex_resolve_node_to_value(&info->resolved_node, NULL); 231 acpi_ex_exit_interpreter(); 232 233 /* 234 * If acpi_ex_resolve_node_to_value() succeeded, the return value was placed 235 * in resolved_node. 236 */ 237 if (ACPI_SUCCESS(status)) { 238 status = AE_CTRL_RETURN_VALUE; 239 info->return_object = 240 ACPI_CAST_PTR(union acpi_operand_object, 241 info->resolved_node); 242 243 ACPI_DEBUG_PRINT((ACPI_DB_NAMES, 244 "Returning object %p [%s]\n", 245 info->return_object, 246 acpi_ut_get_object_type_name(info-> 247 return_object))); 248 } 249 } 250 251 /* 252 * Check input argument count against the ASL-defined count for a method. 253 * Also check predefined names: argument count and return value against 254 * the ACPI specification. Some incorrect return value types are repaired. 255 */ 256 (void)acpi_ns_check_predefined_names(node, info->param_count, 257 status, &info->return_object); 258 259 /* Check if there is a return value that must be dealt with */ 260 261 if (status == AE_CTRL_RETURN_VALUE) { 262 263 /* If caller does not want the return value, delete it */ 264 265 if (info->flags & ACPI_IGNORE_RETURN_VALUE) { 266 acpi_ut_remove_reference(info->return_object); 267 info->return_object = NULL; 268 } 269 270 /* Map AE_CTRL_RETURN_VALUE to AE_OK, we are done with it */ 271 272 status = AE_OK; 273 } 274 275 ACPI_DEBUG_PRINT((ACPI_DB_NAMES, 276 "*** Completed evaluation of object %s ***\n", 277 info->pathname)); 278 279 /* 280 * Namespace was unlocked by the handling acpi_ns* function, so we 281 * just return 282 */ 283 return_ACPI_STATUS(status); 284 } 285 286 /******************************************************************************* 287 * 288 * FUNCTION: acpi_ns_exec_module_code_list 289 * 290 * PARAMETERS: None 291 * 292 * RETURN: None. Exceptions during method execution are ignored, since 293 * we cannot abort a table load. 294 * 295 * DESCRIPTION: Execute all elements of the global module-level code list. 296 * Each element is executed as a single control method. 297 * 298 ******************************************************************************/ 299 300 void acpi_ns_exec_module_code_list(void) 301 { 302 union acpi_operand_object *prev; 303 union acpi_operand_object *next; 304 struct acpi_evaluate_info *info; 305 u32 method_count = 0; 306 307 ACPI_FUNCTION_TRACE(ns_exec_module_code_list); 308 309 /* Exit now if the list is empty */ 310 311 next = acpi_gbl_module_code_list; 312 if (!next) { 313 return_VOID; 314 } 315 316 /* Allocate the evaluation information block */ 317 318 info = ACPI_ALLOCATE(sizeof(struct acpi_evaluate_info)); 319 if (!info) { 320 return_VOID; 321 } 322 323 /* Walk the list, executing each "method" */ 324 325 while (next) { 326 prev = next; 327 next = next->method.mutex; 328 329 /* Clear the link field and execute the method */ 330 331 prev->method.mutex = NULL; 332 acpi_ns_exec_module_code(prev, info); 333 method_count++; 334 335 /* Delete the (temporary) method object */ 336 337 acpi_ut_remove_reference(prev); 338 } 339 340 ACPI_INFO((AE_INFO, 341 "Executed %u blocks of module-level executable AML code", 342 method_count)); 343 344 ACPI_FREE(info); 345 acpi_gbl_module_code_list = NULL; 346 return_VOID; 347 } 348 349 /******************************************************************************* 350 * 351 * FUNCTION: acpi_ns_exec_module_code 352 * 353 * PARAMETERS: method_obj - Object container for the module-level code 354 * info - Info block for method evaluation 355 * 356 * RETURN: None. Exceptions during method execution are ignored, since 357 * we cannot abort a table load. 358 * 359 * DESCRIPTION: Execute a control method containing a block of module-level 360 * executable AML code. The control method is temporarily 361 * installed to the root node, then evaluated. 362 * 363 ******************************************************************************/ 364 365 static void 366 acpi_ns_exec_module_code(union acpi_operand_object *method_obj, 367 struct acpi_evaluate_info *info) 368 { 369 union acpi_operand_object *parent_obj; 370 struct acpi_namespace_node *parent_node; 371 acpi_object_type type; 372 acpi_status status; 373 374 ACPI_FUNCTION_TRACE(ns_exec_module_code); 375 376 /* 377 * Get the parent node. We cheat by using the next_object field 378 * of the method object descriptor. 379 */ 380 parent_node = ACPI_CAST_PTR(struct acpi_namespace_node, 381 method_obj->method.next_object); 382 type = acpi_ns_get_type(parent_node); 383 384 /* 385 * Get the region handler and save it in the method object. We may need 386 * this if an operation region declaration causes a _REG method to be run. 387 * 388 * We can't do this in acpi_ps_link_module_code because 389 * acpi_gbl_root_node->Object is NULL at PASS1. 390 */ 391 if ((type == ACPI_TYPE_DEVICE) && parent_node->object) { 392 method_obj->method.dispatch.handler = 393 parent_node->object->device.handler; 394 } 395 396 /* Must clear next_object (acpi_ns_attach_object needs the field) */ 397 398 method_obj->method.next_object = NULL; 399 400 /* Initialize the evaluation information block */ 401 402 ACPI_MEMSET(info, 0, sizeof(struct acpi_evaluate_info)); 403 info->prefix_node = parent_node; 404 405 /* 406 * Get the currently attached parent object. Add a reference, because the 407 * ref count will be decreased when the method object is installed to 408 * the parent node. 409 */ 410 parent_obj = acpi_ns_get_attached_object(parent_node); 411 if (parent_obj) { 412 acpi_ut_add_reference(parent_obj); 413 } 414 415 /* Install the method (module-level code) in the parent node */ 416 417 status = acpi_ns_attach_object(parent_node, method_obj, 418 ACPI_TYPE_METHOD); 419 if (ACPI_FAILURE(status)) { 420 goto exit; 421 } 422 423 /* Execute the parent node as a control method */ 424 425 status = acpi_ns_evaluate(info); 426 427 ACPI_DEBUG_PRINT((ACPI_DB_INIT, "Executed module-level code at %p\n", 428 method_obj->method.aml_start)); 429 430 /* Delete a possible implicit return value (in slack mode) */ 431 432 if (info->return_object) { 433 acpi_ut_remove_reference(info->return_object); 434 } 435 436 /* Detach the temporary method object */ 437 438 acpi_ns_detach_object(parent_node); 439 440 /* Restore the original parent object */ 441 442 if (parent_obj) { 443 status = acpi_ns_attach_object(parent_node, parent_obj, type); 444 } else { 445 parent_node->type = (u8)type; 446 } 447 448 exit: 449 if (parent_obj) { 450 acpi_ut_remove_reference(parent_obj); 451 } 452 return_VOID; 453 } 454