exresolv.c revision 99679
1 2/****************************************************************************** 3 * 4 * Module Name: exresolv - AML Interpreter object resolution 5 * $Revision: 114 $ 6 * 7 *****************************************************************************/ 8 9/****************************************************************************** 10 * 11 * 1. Copyright Notice 12 * 13 * Some or all of this work - Copyright (c) 1999 - 2002, Intel Corp. 14 * All rights reserved. 15 * 16 * 2. License 17 * 18 * 2.1. This is your license from Intel Corp. under its intellectual property 19 * rights. You may have additional license terms from the party that provided 20 * you this software, covering your right to use that party's intellectual 21 * property rights. 22 * 23 * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a 24 * copy of the source code appearing in this file ("Covered Code") an 25 * irrevocable, perpetual, worldwide license under Intel's copyrights in the 26 * base code distributed originally by Intel ("Original Intel Code") to copy, 27 * make derivatives, distribute, use and display any portion of the Covered 28 * Code in any form, with the right to sublicense such rights; and 29 * 30 * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent 31 * license (with the right to sublicense), under only those claims of Intel 32 * patents that are infringed by the Original Intel Code, to make, use, sell, 33 * offer to sell, and import the Covered Code and derivative works thereof 34 * solely to the minimum extent necessary to exercise the above copyright 35 * license, and in no event shall the patent license extend to any additions 36 * to or modifications of the Original Intel Code. No other license or right 37 * is granted directly or by implication, estoppel or otherwise; 38 * 39 * The above copyright and patent license is granted only if the following 40 * conditions are met: 41 * 42 * 3. Conditions 43 * 44 * 3.1. Redistribution of Source with Rights to Further Distribute Source. 45 * Redistribution of source code of any substantial portion of the Covered 46 * Code or modification with rights to further distribute source must include 47 * the above Copyright Notice, the above License, this list of Conditions, 48 * and the following Disclaimer and Export Compliance provision. In addition, 49 * Licensee must cause all Covered Code to which Licensee contributes to 50 * contain a file documenting the changes Licensee made to create that Covered 51 * Code and the date of any change. Licensee must include in that file the 52 * documentation of any changes made by any predecessor Licensee. Licensee 53 * must include a prominent statement that the modification is derived, 54 * directly or indirectly, from Original Intel Code. 55 * 56 * 3.2. Redistribution of Source with no Rights to Further Distribute Source. 57 * Redistribution of source code of any substantial portion of the Covered 58 * Code or modification without rights to further distribute source must 59 * include the following Disclaimer and Export Compliance provision in the 60 * documentation and/or other materials provided with distribution. In 61 * addition, Licensee may not authorize further sublicense of source of any 62 * portion of the Covered Code, and must include terms to the effect that the 63 * license from Licensee to its licensee is limited to the intellectual 64 * property embodied in the software Licensee provides to its licensee, and 65 * not to intellectual property embodied in modifications its licensee may 66 * make. 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 __EXRESOLV_C__ 119 120#include "acpi.h" 121#include "amlcode.h" 122#include "acdispat.h" 123#include "acinterp.h" 124 125 126#define _COMPONENT ACPI_EXECUTER 127 ACPI_MODULE_NAME ("exresolv") 128 129 130/******************************************************************************* 131 * 132 * FUNCTION: AcpiExResolveToValue 133 * 134 * PARAMETERS: **StackPtr - Points to entry on ObjStack, which can 135 * be either an (ACPI_OPERAND_OBJECT *) 136 * or an ACPI_HANDLE. 137 * WalkState - Current method state 138 * 139 * RETURN: Status 140 * 141 * DESCRIPTION: Convert Reference objects to values 142 * 143 ******************************************************************************/ 144 145ACPI_STATUS 146AcpiExResolveToValue ( 147 ACPI_OPERAND_OBJECT **StackPtr, 148 ACPI_WALK_STATE *WalkState) 149{ 150 ACPI_STATUS Status; 151 152 153 ACPI_FUNCTION_TRACE_PTR ("ExResolveToValue", StackPtr); 154 155 156 if (!StackPtr || !*StackPtr) 157 { 158 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Internal - null pointer\n")); 159 return_ACPI_STATUS (AE_AML_NO_OPERAND); 160 } 161 162 /* 163 * The entity pointed to by the StackPtr can be either 164 * 1) A valid ACPI_OPERAND_OBJECT, or 165 * 2) A ACPI_NAMESPACE_NODE (NamedObj) 166 */ 167 if (ACPI_GET_DESCRIPTOR_TYPE (*StackPtr) == ACPI_DESC_TYPE_OPERAND) 168 { 169 Status = AcpiExResolveObjectToValue (StackPtr, WalkState); 170 if (ACPI_FAILURE (Status)) 171 { 172 return_ACPI_STATUS (Status); 173 } 174 } 175 176 /* 177 * Object on the stack may have changed if AcpiExResolveObjectToValue() 178 * was called (i.e., we can't use an _else_ here.) 179 */ 180 if (ACPI_GET_DESCRIPTOR_TYPE (*StackPtr) == ACPI_DESC_TYPE_NAMED) 181 { 182 Status = AcpiExResolveNodeToValue ( 183 ACPI_CAST_INDIRECT_PTR (ACPI_NAMESPACE_NODE, StackPtr), 184 WalkState); 185 if (ACPI_FAILURE (Status)) 186 { 187 return_ACPI_STATUS (Status); 188 } 189 } 190 191 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Resolved object %p\n", *StackPtr)); 192 return_ACPI_STATUS (AE_OK); 193} 194 195 196/******************************************************************************* 197 * 198 * FUNCTION: AcpiExResolveObjectToValue 199 * 200 * PARAMETERS: StackPtr - Pointer to a stack location that contains a 201 * ptr to an internal object. 202 * WalkState - Current method state 203 * 204 * RETURN: Status 205 * 206 * DESCRIPTION: Retrieve the value from an internal object. The Reference type 207 * uses the associated AML opcode to determine the value. 208 * 209 ******************************************************************************/ 210 211ACPI_STATUS 212AcpiExResolveObjectToValue ( 213 ACPI_OPERAND_OBJECT **StackPtr, 214 ACPI_WALK_STATE *WalkState) 215{ 216 ACPI_STATUS Status = AE_OK; 217 ACPI_OPERAND_OBJECT *StackDesc; 218 void *TempNode; 219 ACPI_OPERAND_OBJECT *ObjDesc; 220 UINT16 Opcode; 221 222 223 ACPI_FUNCTION_TRACE ("ExResolveObjectToValue"); 224 225 226 StackDesc = *StackPtr; 227 228 /* This is an ACPI_OPERAND_OBJECT */ 229 230 switch (ACPI_GET_OBJECT_TYPE (StackDesc)) 231 { 232 case INTERNAL_TYPE_REFERENCE: 233 234 Opcode = StackDesc->Reference.Opcode; 235 236 switch (Opcode) 237 { 238 case AML_NAME_OP: 239 240 /* 241 * Convert indirect name ptr to a direct name ptr. 242 * Then, AcpiExResolveNodeToValue can be used to get the value 243 */ 244 TempNode = StackDesc->Reference.Object; 245 246 /* Delete the Reference Object */ 247 248 AcpiUtRemoveReference (StackDesc); 249 250 /* Put direct name pointer onto stack and exit */ 251 252 (*StackPtr) = TempNode; 253 break; 254 255 256 case AML_LOCAL_OP: 257 case AML_ARG_OP: 258 259 /* 260 * Get the local from the method's state info 261 * Note: this increments the local's object reference count 262 */ 263 Status = AcpiDsMethodDataGetValue (Opcode, 264 StackDesc->Reference.Offset, WalkState, &ObjDesc); 265 if (ACPI_FAILURE (Status)) 266 { 267 return_ACPI_STATUS (Status); 268 } 269 270 /* 271 * Now we can delete the original Reference Object and 272 * replace it with the resolve value 273 */ 274 AcpiUtRemoveReference (StackDesc); 275 *StackPtr = ObjDesc; 276 277 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "[Arg/Local %d] ValueObj is %p\n", 278 StackDesc->Reference.Offset, ObjDesc)); 279 break; 280 281 282 case AML_INDEX_OP: 283 284 switch (StackDesc->Reference.TargetType) 285 { 286 case ACPI_TYPE_BUFFER_FIELD: 287 288 /* Just return - leave the Reference on the stack */ 289 break; 290 291 292 case ACPI_TYPE_PACKAGE: 293 294 ObjDesc = *StackDesc->Reference.Where; 295 if (ObjDesc) 296 { 297 /* 298 * Valid obj descriptor, copy pointer to return value 299 * (i.e., dereference the package index) 300 * Delete the ref object, increment the returned object 301 */ 302 AcpiUtRemoveReference (StackDesc); 303 AcpiUtAddReference (ObjDesc); 304 *StackPtr = ObjDesc; 305 } 306 else 307 { 308 /* 309 * A NULL object descriptor means an unitialized element of 310 * the package, can't dereference it 311 */ 312 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, 313 "Attempt to deref an Index to NULL pkg element Idx=%p\n", 314 StackDesc)); 315 Status = AE_AML_UNINITIALIZED_ELEMENT; 316 } 317 break; 318 319 320 default: 321 322 /* Invalid reference object */ 323 324 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, 325 "Unknown TargetType %X in Index/Reference obj %p\n", 326 StackDesc->Reference.TargetType, StackDesc)); 327 Status = AE_AML_INTERNAL; 328 break; 329 } 330 break; 331 332 333 case AML_DEBUG_OP: 334 335 /* Just leave the object as-is */ 336 break; 337 338 339 default: 340 341 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Unknown Reference opcode %X in %p\n", 342 Opcode, StackDesc)); 343 Status = AE_AML_INTERNAL; 344 break; 345 } 346 break; 347 348 349 case ACPI_TYPE_BUFFER: 350 351 Status = AcpiDsGetBufferArguments (StackDesc); 352 break; 353 354 355 case ACPI_TYPE_PACKAGE: 356 357 Status = AcpiDsGetPackageArguments (StackDesc); 358 break; 359 360 361 /* 362 * These cases may never happen here, but just in case.. 363 */ 364 case ACPI_TYPE_BUFFER_FIELD: 365 case INTERNAL_TYPE_REGION_FIELD: 366 case INTERNAL_TYPE_BANK_FIELD: 367 case INTERNAL_TYPE_INDEX_FIELD: 368 369 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "FieldRead SourceDesc=%p Type=%X\n", 370 StackDesc, ACPI_GET_OBJECT_TYPE (StackDesc))); 371 372 Status = AcpiExReadDataFromField (WalkState, StackDesc, &ObjDesc); 373 *StackPtr = (void *) ObjDesc; 374 break; 375 376 default: 377 break; 378 } 379 380 return_ACPI_STATUS (Status); 381} 382 383 384