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