drivers/acpi/utilities/utstate.c

   1 /*******************************************************************************
   2  *
   3  * Module Name: utstate - state object support procedures
   4  *
   5  ******************************************************************************/
   6
   7 /******************************************************************************
   8  *
   9  * 1. Copyright Notice
  10  *
  11  * Some or all of this work - Copyright (c) 1999 - 2010, Intel Corp.
  12  * All rights reserved.
  13  *
  14  * 2. License
  15  *
  16  * 2.1. This is your license from Intel Corp. under its intellectual property
  17  * rights.  You may have additional license terms from the party that provided
  18  * you this software, covering your right to use that party's intellectual
  19  * property rights.
  20  *
  21  * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
  22  * copy of the source code appearing in this file ("Covered Code") an
  23  * irrevocable, perpetual, worldwide license under Intel's copyrights in the
  24  * base code distributed originally by Intel ("Original Intel Code") to copy,
  25  * make derivatives, distribute, use and display any portion of the Covered
  26  * Code in any form, with the right to sublicense such rights; and
  27  *
  28  * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
  29  * license (with the right to sublicense), under only those claims of Intel
  30  * patents that are infringed by the Original Intel Code, to make, use, sell,
  31  * offer to sell, and import the Covered Code and derivative works thereof
  32  * solely to the minimum extent necessary to exercise the above copyright
  33  * license, and in no event shall the patent license extend to any additions
  34  * to or modifications of the Original Intel Code.  No other license or right
  35  * is granted directly or by implication, estoppel or otherwise;
  36  *
  37  * The above copyright and patent license is granted only if the following
  38  * conditions are met:
  39  *
  40  * 3. Conditions
  41  *
  42  * 3.1. Redistribution of Source with Rights to Further Distribute Source.
  43  * Redistribution of source code of any substantial portion of the Covered
  44  * Code or modification with rights to further distribute source must include
  45  * the above Copyright Notice, the above License, this list of Conditions,
  46  * and the following Disclaimer and Export Compliance provision.  In addition,
  47  * Licensee must cause all Covered Code to which Licensee contributes to
  48  * contain a file documenting the changes Licensee made to create that Covered
  49  * Code and the date of any change.  Licensee must include in that file the
  50  * documentation of any changes made by any predecessor Licensee.  Licensee
  51  * must include a prominent statement that the modification is derived,
  52  * directly or indirectly, from Original Intel Code.
  53  *
  54  * 3.2. Redistribution of Source with no Rights to Further Distribute Source.
  55  * Redistribution of source code of any substantial portion of the Covered
  56  * Code or modification without rights to further distribute source must
  57  * include the following Disclaimer and Export Compliance provision in the
  58  * documentation and/or other materials provided with distribution.  In
  59  * addition, Licensee may not authorize further sublicense of source of any
  60  * portion of the Covered Code, and must include terms to the effect that the
  61  * license from Licensee to its licensee is limited to the intellectual
  62  * property embodied in the software Licensee provides to its licensee, and
  63  * not to intellectual property embodied in modifications its licensee may
  64  * make.
  65  *
  66  * 3.3. Redistribution of Executable. Redistribution in executable form of any
  67  * substantial portion of the Covered Code or modification must reproduce the
  68  * above Copyright Notice, and the following Disclaimer and Export Compliance
  69  * provision in the documentation and/or other materials provided with the
  70  * distribution.
  71  *
  72  * 3.4. Intel retains all right, title, and interest in and to the Original
  73  * Intel Code.
  74  *
  75  * 3.5. Neither the name Intel nor any other trademark owned or controlled by
  76  * Intel shall be used in advertising or otherwise to promote the sale, use or
  77  * other dealings in products derived from or relating to the Covered Code
  78  * without prior written authorization from Intel.
  79  *
  80  * 4. Disclaimer and Export Compliance
  81  *
  82  * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
  83  * HERE.  ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
  84  * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT,  ASSISTANCE,
  85  * INSTALLATION, TRAINING OR OTHER SERVICES.  INTEL WILL NOT PROVIDE ANY
  86  * UPDATES, ENHANCEMENTS OR EXTENSIONS.  INTEL SPECIFICALLY DISCLAIMS ANY
  87  * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
  88  * PARTICULAR PURPOSE.
  89  *
  90  * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
  91  * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
  92  * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
  93  * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
  94  * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
  95  * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES.  THESE LIMITATIONS
  96  * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
  97  * LIMITED REMEDY.
  98  *
  99  * 4.3. Licensee shall not export, either directly or indirectly, any of this
 100  * software or system incorporating such software without first obtaining any
 101  * required license or other approval from the U. S. Department of Commerce or
 102  * any other agency or department of the United States Government.  In the
 103  * event Licensee exports any such software from the United States or
 104  * re-exports any such software from a foreign destination, Licensee shall
 105  * ensure that the distribution and export/re-export of the software is in
 106  * compliance with all laws, regulations, orders, or other restrictions of the
 107  * U.S. Export Administration Regulations. Licensee agrees that neither it nor
 108  * any of its subsidiaries will export/re-export any technical data, process,
 109  * software, or service, directly or indirectly, to any country for which the
 110  * United States government or any agency thereof requires an export license,
 111  * other governmental approval, or letter of assurance, without first obtaining
 112  * such license, approval or letter.
 113  *
 114  *****************************************************************************/
 115
 116
 117 #define __UTSTATE_C__
 118
 119 #include "acpi.h"
 120 #include "accommon.h"
 121
 122 #define _COMPONENT          ACPI_UTILITIES
 123         ACPI_MODULE_NAME    ("utstate")
 124
 125
 126 /*******************************************************************************
 127  *
 128  * FUNCTION:    AcpiUtCreatePkgStateAndPush
 129  *
 130  * PARAMETERS:  Object          - Object to be added to the new state
 131  *              Action          - Increment/Decrement
 132  *              StateList       - List the state will be added to
 133  *
 134  * RETURN:      Status
 135  *
 136  * DESCRIPTION: Create a new state and push it
 137  *
 138  ******************************************************************************/
 139
 140 ACPI_STATUS
 141 AcpiUtCreatePkgStateAndPush (
 142     void                    *InternalObject,
 143     void                    *ExternalObject,
 144     UINT16                  Index,
 145     ACPI_GENERIC_STATE      **StateList)
 146 {
 147     ACPI_GENERIC_STATE       *State;
 148
 149
 150     ACPI_FUNCTION_ENTRY ();
 151
 152
 153     State = AcpiUtCreatePkgState (InternalObject, ExternalObject, Index);
 154     if (!State)
 155     {
 156         return (AE_NO_MEMORY);
 157     }
 158
 159     AcpiUtPushGenericState (StateList, State);
 160     return (AE_OK);
 161 }
 162
 163
 164 /*******************************************************************************
 165  *
 166  * FUNCTION:    AcpiUtPushGenericState
 167  *
 168  * PARAMETERS:  ListHead            - Head of the state stack
 169  *              State               - State object to push
 170  *
 171  * RETURN:      None
 172  *
 173  * DESCRIPTION: Push a state object onto a state stack
 174  *
 175  ******************************************************************************/
 176
 177 void
 178 AcpiUtPushGenericState (
 179     ACPI_GENERIC_STATE      **ListHead,
 180     ACPI_GENERIC_STATE      *State)
 181 {
 182     ACPI_FUNCTION_TRACE (UtPushGenericState);
 183
 184
 185     /* Push the state object onto the front of the list (stack) */
 186
 187     State->Common.Next = *ListHead;
 188     *ListHead = State;
 189
 190     return_VOID;
 191 }
 192
 193
 194 /*******************************************************************************
 195  *
 196  * FUNCTION:    AcpiUtPopGenericState
 197  *
 198  * PARAMETERS:  ListHead            - Head of the state stack
 199  *
 200  * RETURN:      The popped state object
 201  *
 202  * DESCRIPTION: Pop a state object from a state stack
 203  *
 204  ******************************************************************************/
 205
 206 ACPI_GENERIC_STATE *
 207 AcpiUtPopGenericState (
 208     ACPI_GENERIC_STATE      **ListHead)
 209 {
 210     ACPI_GENERIC_STATE      *State;
 211
 212
 213     ACPI_FUNCTION_TRACE (UtPopGenericState);
 214
 215
 216     /* Remove the state object at the head of the list (stack) */
 217
 218     State = *ListHead;
 219     if (State)
 220     {
 221         /* Update the list head */
 222
 223         *ListHead = State->Common.Next;
 224     }
 225
 226     return_PTR (State);
 227 }
 228
 229
 230 /*******************************************************************************
 231  *
 232  * FUNCTION:    AcpiUtCreateGenericState
 233  *
 234  * PARAMETERS:  None
 235  *
 236  * RETURN:      The new state object. NULL on failure.
 237  *
 238  * DESCRIPTION: Create a generic state object.  Attempt to obtain one from
 239  *              the global state cache;  If none available, create a new one.
 240  *
 241  ******************************************************************************/
 242
 243 ACPI_GENERIC_STATE *
 244 AcpiUtCreateGenericState (
 245     void)
 246 {
 247     ACPI_GENERIC_STATE      *State;
 248
 249
 250     ACPI_FUNCTION_ENTRY ();
 251
 252
 253     State = AcpiOsAcquireObject (AcpiGbl_StateCache);
 254     if (State)
 255     {
 256         /* Initialize */
 257         State->Common.DescriptorType = ACPI_DESC_TYPE_STATE;
 258     }
 259
 260     return (State);
 261 }
 262
 263
 264 /*******************************************************************************
 265  *
 266  * FUNCTION:    AcpiUtCreateThreadState
 267  *
 268  * PARAMETERS:  None
 269  *
 270  * RETURN:      New Thread State. NULL on failure
 271  *
 272  * DESCRIPTION: Create a "Thread State" - a flavor of the generic state used
 273  *              to track per-thread info during method execution
 274  *
 275  ******************************************************************************/
 276
 277 ACPI_THREAD_STATE *
 278 AcpiUtCreateThreadState (
 279     void)
 280 {
 281     ACPI_GENERIC_STATE      *State;
 282
 283
 284     ACPI_FUNCTION_TRACE (UtCreateThreadState);
 285
 286
 287     /* Create the generic state object */
 288
 289     State = AcpiUtCreateGenericState ();
 290     if (!State)
 291     {
 292         return_PTR (NULL);
 293     }
 294
 295     /* Init fields specific to the update struct */
 296
 297     State->Common.DescriptorType = ACPI_DESC_TYPE_STATE_THREAD;
 298     State->Thread.ThreadId = AcpiOsGetThreadId ();
 299
 300     /* Check for invalid thread ID - zero is very bad, it will break things */
 301
 302     if (!State->Thread.ThreadId)
 303     {
 304         ACPI_ERROR ((AE_INFO, "Invalid zero ID from AcpiOsGetThreadId"));
 305         State->Thread.ThreadId = (ACPI_THREAD_ID) 1;
 306     }
 307
 308     return_PTR ((ACPI_THREAD_STATE *) State);
 309 }
 310
 311
 312 /*******************************************************************************
 313  *
 314  * FUNCTION:    AcpiUtCreateUpdateState
 315  *
 316  * PARAMETERS:  Object          - Initial Object to be installed in the state
 317  *              Action          - Update action to be performed
 318  *
 319  * RETURN:      New state object, null on failure
 320  *
 321  * DESCRIPTION: Create an "Update State" - a flavor of the generic state used
 322  *              to update reference counts and delete complex objects such
 323  *              as packages.
 324  *
 325  ******************************************************************************/
 326
 327 ACPI_GENERIC_STATE *
 328 AcpiUtCreateUpdateState (
 329     ACPI_OPERAND_OBJECT     *Object,
 330     UINT16                  Action)
 331 {
 332     ACPI_GENERIC_STATE      *State;
 333
 334
 335     ACPI_FUNCTION_TRACE_PTR (UtCreateUpdateState, Object);
 336
 337
 338     /* Create the generic state object */
 339
 340     State = AcpiUtCreateGenericState ();
 341     if (!State)
 342     {
 343         return_PTR (NULL);
 344     }
 345
 346     /* Init fields specific to the update struct */
 347
 348     State->Common.DescriptorType = ACPI_DESC_TYPE_STATE_UPDATE;
 349     State->Update.Object = Object;
 350     State->Update.Value = Action;
 351
 352     return_PTR (State);
 353 }
 354
 355
 356 /*******************************************************************************
 357  *
 358  * FUNCTION:    AcpiUtCreatePkgState
 359  *
 360  * PARAMETERS:  Object          - Initial Object to be installed in the state
 361  *              Action          - Update action to be performed
 362  *
 363  * RETURN:      New state object, null on failure
 364  *
 365  * DESCRIPTION: Create a "Package State"
 366  *
 367  ******************************************************************************/
 368
 369 ACPI_GENERIC_STATE *
 370 AcpiUtCreatePkgState (
 371     void                    *InternalObject,
 372     void                    *ExternalObject,
 373     UINT16                  Index)
 374 {
 375     ACPI_GENERIC_STATE      *State;
 376
 377
 378     ACPI_FUNCTION_TRACE_PTR (UtCreatePkgState, InternalObject);
 379
 380
 381     /* Create the generic state object */
 382
 383     State = AcpiUtCreateGenericState ();
 384     if (!State)
 385     {
 386         return_PTR (NULL);
 387     }
 388
 389     /* Init fields specific to the update struct */
 390
 391     State->Common.DescriptorType = ACPI_DESC_TYPE_STATE_PACKAGE;
 392     State->Pkg.SourceObject = (ACPI_OPERAND_OBJECT *) InternalObject;
 393     State->Pkg.DestObject = ExternalObject;
 394     State->Pkg.Index= Index;
 395     State->Pkg.NumPackages = 1;
 396
 397     return_PTR (State);
 398 }
 399
 400
 401 /*******************************************************************************
 402  *
 403  * FUNCTION:    AcpiUtCreateControlState
 404  *
 405  * PARAMETERS:  None
 406  *
 407  * RETURN:      New state object, null on failure
 408  *
 409  * DESCRIPTION: Create a "Control State" - a flavor of the generic state used
 410  *              to support nested IF/WHILE constructs in the AML.
 411  *
 412  ******************************************************************************/
 413
 414 ACPI_GENERIC_STATE *
 415 AcpiUtCreateControlState (
 416     void)
 417 {
 418     ACPI_GENERIC_STATE      *State;
 419
 420
 421     ACPI_FUNCTION_TRACE (UtCreateControlState);
 422
 423
 424     /* Create the generic state object */
 425
 426     State = AcpiUtCreateGenericState ();
 427     if (!State)
 428     {
 429         return_PTR (NULL);
 430     }
 431
 432     /* Init fields specific to the control struct */
 433
 434     State->Common.DescriptorType = ACPI_DESC_TYPE_STATE_CONTROL;
 435     State->Common.State = ACPI_CONTROL_CONDITIONAL_EXECUTING;
 436
 437     return_PTR (State);
 438 }
 439
 440
 441 /*******************************************************************************
 442  *
 443  * FUNCTION:    AcpiUtDeleteGenericState
 444  *
 445  * PARAMETERS:  State               - The state object to be deleted
 446  *
 447  * RETURN:      None
 448  *
 449  * DESCRIPTION: Release a state object to the state cache. NULL state objects
 450  *              are ignored.
 451  *
 452  ******************************************************************************/
 453
 454 void
 455 AcpiUtDeleteGenericState (
 456     ACPI_GENERIC_STATE      *State)
 457 {
 458     ACPI_FUNCTION_TRACE (UtDeleteGenericState);
 459
 460
 461     /* Ignore null state */
 462
 463     if (State)
 464     {
 465         (void) AcpiOsReleaseObject (AcpiGbl_StateCache, State);
 466     }
 467     return_VOID;
 468 }
 469
 470