1 /******************************************************************************* 2 * 3 * Module Name: nseval - Object evaluation, includes control method execution 4 * $Revision: 1.142 $ 5 * 6 ******************************************************************************/ 7 8 /****************************************************************************** 9 * 10 * 1. Copyright Notice 11 * 12 * Some or all of this work - Copyright (c) 1999 - 2006, Intel Corp. 13 * All rights reserved. 14 * 15 * 2. License 16 * 17 * 2.1. This is your license from Intel Corp. under its intellectual property 18 * rights. You may have additional license terms from the party that provided 19 * you this software, covering your right to use that party's intellectual 20 * property rights. 21 * 22 * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a 23 * copy of the source code appearing in this file ("Covered Code") an 24 * irrevocable, perpetual, worldwide license under Intel's copyrights in the 25 * base code distributed originally by Intel ("Original Intel Code") to copy, 26 * make derivatives, distribute, use and display any portion of the Covered 27 * Code in any form, with the right to sublicense such rights; and 28 * 29 * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent 30 * license (with the right to sublicense), under only those claims of Intel 31 * patents that are infringed by the Original Intel Code, to make, use, sell, 32 * offer to sell, and import the Covered Code and derivative works thereof 33 * solely to the minimum extent necessary to exercise the above copyright 34 * license, and in no event shall the patent license extend to any additions 35 * to or modifications of the Original Intel Code. No other license or right 36 * is granted directly or by implication, estoppel or otherwise; 37 * 38 * The above copyright and patent license is granted only if the following 39 * conditions are met: 40 * 41 * 3. Conditions 42 * 43 * 3.1. Redistribution of Source with Rights to Further Distribute Source. 44 * Redistribution of source code of any substantial portion of the Covered 45 * Code or modification with rights to further distribute source must include 46 * the above Copyright Notice, the above License, this list of Conditions, 47 * and the following Disclaimer and Export Compliance provision. In addition, 48 * Licensee must cause all Covered Code to which Licensee contributes to 49 * contain a file documenting the changes Licensee made to create that Covered 50 * Code and the date of any change. Licensee must include in that file the 51 * documentation of any changes made by any predecessor Licensee. Licensee 52 * must include a prominent statement that the modification is derived, 53 * directly or indirectly, from Original Intel Code. 54 * 55 * 3.2. Redistribution of Source with no Rights to Further Distribute Source. 56 * Redistribution of source code of any substantial portion of the Covered 57 * Code or modification without rights to further distribute source must 58 * include the following Disclaimer and Export Compliance provision in the 59 * documentation and/or other materials provided with distribution. In 60 * addition, Licensee may not authorize further sublicense of source of any 61 * portion of the Covered Code, and must include terms to the effect that the 62 * license from Licensee to its licensee is limited to the intellectual 63 * property embodied in the software Licensee provides to its licensee, and 64 * not to intellectual property embodied in modifications its licensee may 65 * make. 66 67 * 68 * 3.3. Redistribution of Executable. Redistribution in executable form of any 69 * substantial portion of the Covered Code or modification must reproduce the 70 * above Copyright Notice, and the following Disclaimer and Export Compliance 71 * provision in the documentation and/or other materials provided with the 72 * distribution. 73 * 74 * 3.4. Intel retains all right, title, and interest in and to the Original 75 * Intel Code. 76 * 77 * 3.5. Neither the name Intel nor any other trademark owned or controlled by 78 * Intel shall be used in advertising or otherwise to promote the sale, use or 79 * other dealings in products derived from or relating to the Covered Code 80 * without prior written authorization from Intel. 81 * 82 * 4. Disclaimer and Export Compliance 83 * 84 * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED 85 * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE 86 * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE, 87 * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY 88 * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY 89 * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A 90 * PARTICULAR PURPOSE. 91 * 92 * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES 93 * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR 94 * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT, 95 * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY 96 * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL 97 * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS 98 * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY 99 * LIMITED REMEDY. 100 * 101 * 4.3. Licensee shall not export, either directly or indirectly, any of this 102 * software or system incorporating such software without first obtaining any 103 * required license or other approval from the U. S. Department of Commerce or 104 * any other agency or department of the United States Government. In the 105 * event Licensee exports any such software from the United States or 106 * re-exports any such software from a foreign destination, Licensee shall 107 * ensure that the distribution and export/re-export of the software is in 108 * compliance with all laws, regulations, orders, or other restrictions of the 109 * U.S. Export Administration Regulations. Licensee agrees that neither it nor 110 * any of its subsidiaries will export/re-export any technical data, process, 111 * software, or service, directly or indirectly, to any country for which the 112 * United States government or any agency thereof requires an export license, 113 * other governmental approval, or letter of assurance, without first obtaining 114 * such license, approval or letter. 115 * 116 *****************************************************************************/ 117 118 #define __NSEVAL_C__ 119 120 #include "acpi.h" 121 #include "acparser.h" 122 #include "acinterp.h" 123 #include "acnamesp.h" 124 125 126 #define _COMPONENT ACPI_NAMESPACE 127 ACPI_MODULE_NAME ("nseval") 128 129 130 /******************************************************************************* 131 * 132 * FUNCTION: AcpiNsEvaluate 133 * 134 * PARAMETERS: Info - Evaluation info block, contains: 135 * PrefixNode - Prefix or Method/Object Node to execute 136 * Pathname - Name of method to execute, If NULL, the 137 * Node is the object to execute 138 * Parameters - List of parameters to pass to the method, 139 * terminated by NULL. Params itself may be 140 * NULL if no parameters are being passed. 141 * ReturnObject - Where to put method's return value (if 142 * any). If NULL, no value is returned. 143 * ParameterType - Type of Parameter list 144 * ReturnObject - Where to put method's return value (if 145 * any). If NULL, no value is returned. 146 * Flags - ACPI_IGNORE_RETURN_VALUE to delete return 147 * 148 * RETURN: Status 149 * 150 * DESCRIPTION: Execute a control method or return the current value of an 151 * ACPI namespace object. 152 * 153 * MUTEX: Locks interpreter 154 * 155 ******************************************************************************/ 156 157 ACPI_STATUS 158 AcpiNsEvaluate ( 159 ACPI_EVALUATE_INFO *Info) 160 { 161 ACPI_STATUS Status; 162 163 164 ACPI_FUNCTION_TRACE (NsEvaluate); 165 166 167 if (!Info) 168 { 169 return_ACPI_STATUS (AE_BAD_PARAMETER); 170 } 171 172 /* Initialize the return value to an invalid object */ 173 174 Info->ReturnObject = NULL; 175 176 /* 177 * Get the actual namespace node for the target object. Handles these cases: 178 * 179 * 1) Null node, Pathname (absolute path) 180 * 2) Node, Pathname (path relative to Node) 181 * 3) Node, Null Pathname 182 */ 183 Status = AcpiNsGetNode (Info->PrefixNode, Info->Pathname, 184 ACPI_NS_NO_UPSEARCH, &Info->ResolvedNode); 185 if (ACPI_FAILURE (Status)) 186 { 187 return_ACPI_STATUS (Status); 188 } 189 190 /* 191 * For a method alias, we must grab the actual method node so that proper 192 * scoping context will be established before execution. 193 */ 194 if (AcpiNsGetType (Info->ResolvedNode) == ACPI_TYPE_LOCAL_METHOD_ALIAS) 195 { 196 Info->ResolvedNode = 197 ACPI_CAST_PTR (ACPI_NAMESPACE_NODE, Info->ResolvedNode->Object); 198 } 199 200 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, "%s [%p] Value %p\n", Info->Pathname, 201 Info->ResolvedNode, AcpiNsGetAttachedObject (Info->ResolvedNode))); 202 203 /* 204 * Two major cases here: 205 * 206 * 1) The object is a control method -- execute it 207 * 2) The object is not a method -- just return it's current value 208 */ 209 if (AcpiNsGetType (Info->ResolvedNode) == ACPI_TYPE_METHOD) 210 { 211 /* 212 * 1) Object is a control method - execute it 213 */ 214 215 /* Verify that there is a method object associated with this node */ 216 217 Info->ObjDesc = AcpiNsGetAttachedObject (Info->ResolvedNode); 218 if (!Info->ObjDesc) 219 { 220 ACPI_ERROR ((AE_INFO, "Control method has no attached sub-object")); 221 return_ACPI_STATUS (AE_NULL_OBJECT); 222 } 223 224 ACPI_DUMP_PATHNAME (Info->ResolvedNode, "Execute Method:", 225 ACPI_LV_INFO, _COMPONENT); 226 227 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, 228 "Method at AML address %p Length %X\n", 229 Info->ObjDesc->Method.AmlStart + 1, 230 Info->ObjDesc->Method.AmlLength - 1)); 231 232 /* 233 * Any namespace deletion must acquire both the namespace and 234 * interpreter locks to ensure that no thread is using the portion of 235 * the namespace that is being deleted. 236 * 237 * Execute the method via the interpreter. The interpreter is locked 238 * here before calling into the AML parser 239 */ 240 Status = AcpiExEnterInterpreter (); 241 if (ACPI_FAILURE (Status)) 242 { 243 return_ACPI_STATUS (Status); 244 } 245 246 Status = AcpiPsExecuteMethod (Info); 247 AcpiExExitInterpreter (); 248 } 249 else 250 { 251 /* 252 * 2) Object is not a method, return its current value 253 */ 254 255 /* 256 * Objects require additional resolution steps (e.g., the Node may be 257 * a field that must be read, etc.) -- we can't just grab the object 258 * out of the node. 259 * 260 * Use ResolveNodeToValue() to get the associated value. 261 * 262 * NOTE: we can get away with passing in NULL for a walk state because 263 * ResolvedNode is guaranteed to not be a reference to either a method 264 * local or a method argument (because this interface is never called 265 * from a running method.) 266 * 267 * Even though we do not directly invoke the interpreter for object 268 * resolution, we must lock it because we could access an opregion. 269 * The opregion access code assumes that the interpreter is locked. 270 */ 271 Status = AcpiExEnterInterpreter (); 272 if (ACPI_FAILURE (Status)) 273 { 274 return_ACPI_STATUS (Status); 275 } 276 277 /* Function has a strange interface */ 278 279 Status = AcpiExResolveNodeToValue (&Info->ResolvedNode, NULL); 280 AcpiExExitInterpreter (); 281 282 /* 283 * If AcpiExResolveNodeToValue() succeeded, the return value was placed 284 * in ResolvedNode. 285 */ 286 if (ACPI_SUCCESS (Status)) 287 { 288 Status = AE_CTRL_RETURN_VALUE; 289 Info->ReturnObject = 290 ACPI_CAST_PTR (ACPI_OPERAND_OBJECT, Info->ResolvedNode); 291 292 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, "Returning object %p [%s]\n", 293 Info->ReturnObject, 294 AcpiUtGetObjectTypeName (Info->ReturnObject))); 295 } 296 } 297 298 /* 299 * Check if there is a return value that must be dealt with 300 */ 301 if (Status == AE_CTRL_RETURN_VALUE) 302 { 303 /* If caller does not want the return value, delete it */ 304 305 if (Info->Flags & ACPI_IGNORE_RETURN_VALUE) 306 { 307 AcpiUtRemoveReference (Info->ReturnObject); 308 Info->ReturnObject = NULL; 309 } 310 311 /* Map AE_CTRL_RETURN_VALUE to AE_OK, we are done with it */ 312 313 Status = AE_OK; 314 } 315 316 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, 317 "*** Completed evaluation of object %s ***\n", Info->Pathname)); 318 319 /* 320 * Namespace was unlocked by the handling AcpiNs* function, so we 321 * just return 322 */ 323 return_ACPI_STATUS (Status); 324 } 325 326