drivers/acpi/dispatcher/dswscope.c

   1 /******************************************************************************
   2  *
   3  * Module Name: dswscope - Scope stack manipulation
   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 #define __DSWSCOPE_C__
 117
 118 #include "acpi.h"
 119 #include "accommon.h"
 120 #include "acdispat.h"
 121
 122
 123 #define _COMPONENT          ACPI_DISPATCHER
 124         ACPI_MODULE_NAME    ("dswscope")
 125
 126
 127 /****************************************************************************
 128  *
 129  * FUNCTION:    AcpiDsScopeStackClear
 130  *
 131  * PARAMETERS:  WalkState       - Current state
 132  *
 133  * RETURN:      None
 134  *
 135  * DESCRIPTION: Pop (and free) everything on the scope stack except the
 136  *              root scope object (which remains at the stack top.)
 137  *
 138  ***************************************************************************/
 139
 140 void
 141 AcpiDsScopeStackClear (
 142     ACPI_WALK_STATE         *WalkState)
 143 {
 144     ACPI_GENERIC_STATE      *ScopeInfo;
 145
 146     ACPI_FUNCTION_NAME (DsScopeStackClear);
 147
 148
 149     while (WalkState->ScopeInfo)
 150     {
 151         /* Pop a scope off the stack */
 152
 153         ScopeInfo = WalkState->ScopeInfo;
 154         WalkState->ScopeInfo = ScopeInfo->Scope.Next;
 155
 156         ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
 157             "Popped object type (%s)\n",
 158             AcpiUtGetTypeName (ScopeInfo->Common.Value)));
 159         AcpiUtDeleteGenericState (ScopeInfo);
 160     }
 161 }
 162
 163
 164 /****************************************************************************
 165  *
 166  * FUNCTION:    AcpiDsScopeStackPush
 167  *
 168  * PARAMETERS:  Node            - Name to be made current
 169  *              Type            - Type of frame being pushed
 170  *              WalkState       - Current state
 171  *
 172  * RETURN:      Status
 173  *
 174  * DESCRIPTION: Push the current scope on the scope stack, and make the
 175  *              passed Node current.
 176  *
 177  ***************************************************************************/
 178
 179 ACPI_STATUS
 180 AcpiDsScopeStackPush (
 181     ACPI_NAMESPACE_NODE     *Node,
 182     ACPI_OBJECT_TYPE        Type,
 183     ACPI_WALK_STATE         *WalkState)
 184 {
 185     ACPI_GENERIC_STATE      *ScopeInfo;
 186     ACPI_GENERIC_STATE      *OldScopeInfo;
 187
 188
 189     ACPI_FUNCTION_TRACE (DsScopeStackPush);
 190
 191
 192     if (!Node)
 193     {
 194         /* Invalid scope   */
 195
 196         ACPI_ERROR ((AE_INFO, "Null scope parameter"));
 197         return_ACPI_STATUS (AE_BAD_PARAMETER);
 198     }
 199
 200     /* Make sure object type is valid */
 201
 202     if (!AcpiUtValidObjectType (Type))
 203     {
 204         ACPI_WARNING ((AE_INFO,
 205             "Invalid object type: 0x%X", Type));
 206     }
 207
 208     /* Allocate a new scope object */
 209
 210     ScopeInfo = AcpiUtCreateGenericState ();
 211     if (!ScopeInfo)
 212     {
 213         return_ACPI_STATUS (AE_NO_MEMORY);
 214     }
 215
 216     /* Init new scope object */
 217
 218     ScopeInfo->Common.DescriptorType = ACPI_DESC_TYPE_STATE_WSCOPE;
 219     ScopeInfo->Scope.Node = Node;
 220     ScopeInfo->Common.Value = (UINT16) Type;
 221
 222     WalkState->ScopeDepth++;
 223
 224     ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
 225         "[%.2d] Pushed scope ", (UINT32) WalkState->ScopeDepth));
 226
 227     OldScopeInfo = WalkState->ScopeInfo;
 228     if (OldScopeInfo)
 229     {
 230         ACPI_DEBUG_PRINT_RAW ((ACPI_DB_EXEC,
 231             "[%4.4s] (%s)",
 232             AcpiUtGetNodeName (OldScopeInfo->Scope.Node),
 233             AcpiUtGetTypeName (OldScopeInfo->Common.Value)));
 234     }
 235     else
 236     {
 237         ACPI_DEBUG_PRINT_RAW ((ACPI_DB_EXEC,
 238             "[\\___] (%s)", "ROOT"));
 239     }
 240
 241     ACPI_DEBUG_PRINT_RAW ((ACPI_DB_EXEC,
 242         ", New scope -> [%4.4s] (%s)\n",
 243         AcpiUtGetNodeName (ScopeInfo->Scope.Node),
 244         AcpiUtGetTypeName (ScopeInfo->Common.Value)));
 245
 246     /* Push new scope object onto stack */
 247
 248     AcpiUtPushGenericState (&WalkState->ScopeInfo, ScopeInfo);
 249     return_ACPI_STATUS (AE_OK);
 250 }
 251
 252
 253 /****************************************************************************
 254  *
 255  * FUNCTION:    AcpiDsScopeStackPop
 256  *
 257  * PARAMETERS:  WalkState       - Current state
 258  *
 259  * RETURN:      Status
 260  *
 261  * DESCRIPTION: Pop the scope stack once.
 262  *
 263  ***************************************************************************/
 264
 265 ACPI_STATUS
 266 AcpiDsScopeStackPop (
 267     ACPI_WALK_STATE         *WalkState)
 268 {
 269     ACPI_GENERIC_STATE      *ScopeInfo;
 270     ACPI_GENERIC_STATE      *NewScopeInfo;
 271
 272
 273     ACPI_FUNCTION_TRACE (DsScopeStackPop);
 274
 275
 276     /*
 277      * Pop scope info object off the stack.
 278      */
 279     ScopeInfo = AcpiUtPopGenericState (&WalkState->ScopeInfo);
 280     if (!ScopeInfo)
 281     {
 282         return_ACPI_STATUS (AE_STACK_UNDERFLOW);
 283     }
 284
 285     WalkState->ScopeDepth--;
 286
 287     ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
 288         "[%.2d] Popped scope [%4.4s] (%s), New scope -> ",
 289         (UINT32) WalkState->ScopeDepth,
 290         AcpiUtGetNodeName (ScopeInfo->Scope.Node),
 291         AcpiUtGetTypeName (ScopeInfo->Common.Value)));
 292
 293     NewScopeInfo = WalkState->ScopeInfo;
 294     if (NewScopeInfo)
 295     {
 296         ACPI_DEBUG_PRINT_RAW ((ACPI_DB_EXEC,
 297             "[%4.4s] (%s)\n",
 298             AcpiUtGetNodeName (NewScopeInfo->Scope.Node),
 299             AcpiUtGetTypeName (NewScopeInfo->Common.Value)));
 300     }
 301     else
 302     {
 303         ACPI_DEBUG_PRINT_RAW ((ACPI_DB_EXEC,
 304             "[\\___] (ROOT)\n"));
 305     }
 306
 307     AcpiUtDeleteGenericState (ScopeInfo);
 308     return_ACPI_STATUS (AE_OK);
 309 }
 310
 311