1 /****************************************************************************** 2 * 3 * Module Name: nsload - namespace loading/expanding/contracting procedures 4 * 5 *****************************************************************************/ 6 7 /* 8 * Copyright (C) 2000 - 2016, 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 "acnamesp.h" 47 #include "acdispat.h" 48 #include "actables.h" 49 #include "acinterp.h" 50 51 #define _COMPONENT ACPI_NAMESPACE 52 ACPI_MODULE_NAME("nsload") 53 54 /* Local prototypes */ 55 #ifdef ACPI_FUTURE_IMPLEMENTATION 56 acpi_status acpi_ns_unload_namespace(acpi_handle handle); 57 58 static acpi_status acpi_ns_delete_subtree(acpi_handle start_handle); 59 #endif 60 61 #ifndef ACPI_NO_METHOD_EXECUTION 62 /******************************************************************************* 63 * 64 * FUNCTION: acpi_ns_load_table 65 * 66 * PARAMETERS: table_index - Index for table to be loaded 67 * node - Owning NS node 68 * 69 * RETURN: Status 70 * 71 * DESCRIPTION: Load one ACPI table into the namespace 72 * 73 ******************************************************************************/ 74 75 acpi_status 76 acpi_ns_load_table(u32 table_index, struct acpi_namespace_node *node) 77 { 78 acpi_status status; 79 80 ACPI_FUNCTION_TRACE(ns_load_table); 81 82 /* If table already loaded into namespace, just return */ 83 84 if (acpi_tb_is_table_loaded(table_index)) { 85 status = AE_ALREADY_EXISTS; 86 goto unlock; 87 } 88 89 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 90 "**** Loading table into namespace ****\n")); 91 92 status = acpi_tb_allocate_owner_id(table_index); 93 if (ACPI_FAILURE(status)) { 94 goto unlock; 95 } 96 97 /* 98 * Parse the table and load the namespace with all named 99 * objects found within. Control methods are NOT parsed 100 * at this time. In fact, the control methods cannot be 101 * parsed until the entire namespace is loaded, because 102 * if a control method makes a forward reference (call) 103 * to another control method, we can't continue parsing 104 * because we don't know how many arguments to parse next! 105 */ 106 status = acpi_ns_parse_table(table_index, node); 107 if (ACPI_SUCCESS(status)) { 108 acpi_tb_set_table_loaded_flag(table_index, TRUE); 109 } else { 110 /* 111 * On error, delete any namespace objects created by this table. 112 * We cannot initialize these objects, so delete them. There are 113 * a couple of expecially bad cases: 114 * AE_ALREADY_EXISTS - namespace collision. 115 * AE_NOT_FOUND - the target of a Scope operator does not 116 * exist. This target of Scope must already exist in the 117 * namespace, as per the ACPI specification. 118 */ 119 acpi_ns_delete_namespace_by_owner(acpi_gbl_root_table_list. 120 tables[table_index].owner_id); 121 122 acpi_tb_release_owner_id(table_index); 123 return_ACPI_STATUS(status); 124 } 125 126 unlock: 127 if (ACPI_FAILURE(status)) { 128 return_ACPI_STATUS(status); 129 } 130 131 /* 132 * Now we can parse the control methods. We always parse 133 * them here for a sanity check, and if configured for 134 * just-in-time parsing, we delete the control method 135 * parse trees. 136 */ 137 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 138 "**** Begin Table Object Initialization\n")); 139 140 acpi_ex_enter_interpreter(); 141 status = acpi_ds_initialize_objects(table_index, node); 142 acpi_ex_exit_interpreter(); 143 144 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 145 "**** Completed Table Object Initialization\n")); 146 147 /* 148 * Execute any module-level code that was detected during the table load 149 * phase. Although illegal since ACPI 2.0, there are many machines that 150 * contain this type of code. Each block of detected executable AML code 151 * outside of any control method is wrapped with a temporary control 152 * method object and placed on a global list. The methods on this list 153 * are executed below. 154 * 155 * This case executes the module-level code for each table immediately 156 * after the table has been loaded. This provides compatibility with 157 * other ACPI implementations. Optionally, the execution can be deferred 158 * until later, see acpi_initialize_objects. 159 */ 160 if (!acpi_gbl_parse_table_as_term_list 161 && !acpi_gbl_group_module_level_code) { 162 acpi_ns_exec_module_code_list(); 163 } 164 165 return_ACPI_STATUS(status); 166 } 167 168 #ifdef ACPI_OBSOLETE_FUNCTIONS 169 /******************************************************************************* 170 * 171 * FUNCTION: acpi_load_namespace 172 * 173 * PARAMETERS: None 174 * 175 * RETURN: Status 176 * 177 * DESCRIPTION: Load the name space from what ever is pointed to by DSDT. 178 * (DSDT points to either the BIOS or a buffer.) 179 * 180 ******************************************************************************/ 181 182 acpi_status acpi_ns_load_namespace(void) 183 { 184 acpi_status status; 185 186 ACPI_FUNCTION_TRACE(acpi_load_name_space); 187 188 /* There must be at least a DSDT installed */ 189 190 if (acpi_gbl_DSDT == NULL) { 191 ACPI_ERROR((AE_INFO, "DSDT is not in memory")); 192 return_ACPI_STATUS(AE_NO_ACPI_TABLES); 193 } 194 195 /* 196 * Load the namespace. The DSDT is required, 197 * but the SSDT and PSDT tables are optional. 198 */ 199 status = acpi_ns_load_table_by_type(ACPI_TABLE_ID_DSDT); 200 if (ACPI_FAILURE(status)) { 201 return_ACPI_STATUS(status); 202 } 203 204 /* Ignore exceptions from these */ 205 206 (void)acpi_ns_load_table_by_type(ACPI_TABLE_ID_SSDT); 207 (void)acpi_ns_load_table_by_type(ACPI_TABLE_ID_PSDT); 208 209 ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT, 210 "ACPI Namespace successfully loaded at root %p\n", 211 acpi_gbl_root_node)); 212 213 return_ACPI_STATUS(status); 214 } 215 #endif 216 217 #ifdef ACPI_FUTURE_IMPLEMENTATION 218 /******************************************************************************* 219 * 220 * FUNCTION: acpi_ns_delete_subtree 221 * 222 * PARAMETERS: start_handle - Handle in namespace where search begins 223 * 224 * RETURNS Status 225 * 226 * DESCRIPTION: Walks the namespace starting at the given handle and deletes 227 * all objects, entries, and scopes in the entire subtree. 228 * 229 * Namespace/Interpreter should be locked or the subsystem should 230 * be in shutdown before this routine is called. 231 * 232 ******************************************************************************/ 233 234 static acpi_status acpi_ns_delete_subtree(acpi_handle start_handle) 235 { 236 acpi_status status; 237 acpi_handle child_handle; 238 acpi_handle parent_handle; 239 acpi_handle next_child_handle; 240 acpi_handle dummy; 241 u32 level; 242 243 ACPI_FUNCTION_TRACE(ns_delete_subtree); 244 245 parent_handle = start_handle; 246 child_handle = NULL; 247 level = 1; 248 249 /* 250 * Traverse the tree of objects until we bubble back up 251 * to where we started. 252 */ 253 while (level > 0) { 254 255 /* Attempt to get the next object in this scope */ 256 257 status = acpi_get_next_object(ACPI_TYPE_ANY, parent_handle, 258 child_handle, &next_child_handle); 259 260 child_handle = next_child_handle; 261 262 /* Did we get a new object? */ 263 264 if (ACPI_SUCCESS(status)) { 265 266 /* Check if this object has any children */ 267 268 if (ACPI_SUCCESS 269 (acpi_get_next_object 270 (ACPI_TYPE_ANY, child_handle, NULL, &dummy))) { 271 /* 272 * There is at least one child of this object, 273 * visit the object 274 */ 275 level++; 276 parent_handle = child_handle; 277 child_handle = NULL; 278 } 279 } else { 280 /* 281 * No more children in this object, go back up to 282 * the object's parent 283 */ 284 level--; 285 286 /* Delete all children now */ 287 288 acpi_ns_delete_children(child_handle); 289 290 child_handle = parent_handle; 291 status = acpi_get_parent(parent_handle, &parent_handle); 292 if (ACPI_FAILURE(status)) { 293 return_ACPI_STATUS(status); 294 } 295 } 296 } 297 298 /* Now delete the starting object, and we are done */ 299 300 acpi_ns_remove_node(child_handle); 301 return_ACPI_STATUS(AE_OK); 302 } 303 304 /******************************************************************************* 305 * 306 * FUNCTION: acpi_ns_unload_name_space 307 * 308 * PARAMETERS: handle - Root of namespace subtree to be deleted 309 * 310 * RETURN: Status 311 * 312 * DESCRIPTION: Shrinks the namespace, typically in response to an undocking 313 * event. Deletes an entire subtree starting from (and 314 * including) the given handle. 315 * 316 ******************************************************************************/ 317 318 acpi_status acpi_ns_unload_namespace(acpi_handle handle) 319 { 320 acpi_status status; 321 322 ACPI_FUNCTION_TRACE(ns_unload_name_space); 323 324 /* Parameter validation */ 325 326 if (!acpi_gbl_root_node) { 327 return_ACPI_STATUS(AE_NO_NAMESPACE); 328 } 329 330 if (!handle) { 331 return_ACPI_STATUS(AE_BAD_PARAMETER); 332 } 333 334 /* This function does the real work */ 335 336 status = acpi_ns_delete_subtree(handle); 337 return_ACPI_STATUS(status); 338 } 339 #endif 340 #endif 341