1 /******************************************************************************
   2  *
   3  * Module Name: dswscope - Scope stack manipulation
   4  *
   5  *****************************************************************************/
   6 
   7 /*
   8  * Copyright (C) 2000 - 2011, 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 #define __DSWSCOPE_C__
  45 
  46 #include "acpi.h"
  47 #include "accommon.h"
  48 #include "acdispat.h"
  49 
  50 
  51 #define _COMPONENT          ACPI_DISPATCHER
  52         ACPI_MODULE_NAME    ("dswscope")
  53 
  54 
  55 /****************************************************************************
  56  *
  57  * FUNCTION:    AcpiDsScopeStackClear
  58  *
  59  * PARAMETERS:  WalkState       - Current state
  60  *
  61  * RETURN:      None
  62  *
  63  * DESCRIPTION: Pop (and free) everything on the scope stack except the
  64  *              root scope object (which remains at the stack top.)
  65  *
  66  ***************************************************************************/
  67 
  68 void
  69 AcpiDsScopeStackClear (
  70     ACPI_WALK_STATE         *WalkState)
  71 {
  72     ACPI_GENERIC_STATE      *ScopeInfo;
  73 
  74     ACPI_FUNCTION_NAME (DsScopeStackClear);
  75 
  76 
  77     while (WalkState->ScopeInfo)
  78     {
  79         /* Pop a scope off the stack */
  80 
  81         ScopeInfo = WalkState->ScopeInfo;
  82         WalkState->ScopeInfo = ScopeInfo->Scope.Next;
  83 
  84         ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
  85             "Popped object type (%s)\n",
  86             AcpiUtGetTypeName (ScopeInfo->Common.Value)));
  87         AcpiUtDeleteGenericState (ScopeInfo);
  88     }
  89 }
  90 
  91 
  92 /****************************************************************************
  93  *
  94  * FUNCTION:    AcpiDsScopeStackPush
  95  *
  96  * PARAMETERS:  Node            - Name to be made current
  97  *              Type            - Type of frame being pushed
  98  *              WalkState       - Current state
  99  *
 100  * RETURN:      Status
 101  *
 102  * DESCRIPTION: Push the current scope on the scope stack, and make the
 103  *              passed Node current.
 104  *
 105  ***************************************************************************/
 106 
 107 ACPI_STATUS
 108 AcpiDsScopeStackPush (
 109     ACPI_NAMESPACE_NODE     *Node,
 110     ACPI_OBJECT_TYPE        Type,
 111     ACPI_WALK_STATE         *WalkState)
 112 {
 113     ACPI_GENERIC_STATE      *ScopeInfo;
 114     ACPI_GENERIC_STATE      *OldScopeInfo;
 115 
 116 
 117     ACPI_FUNCTION_TRACE (DsScopeStackPush);
 118 
 119 
 120     if (!Node)
 121     {
 122         /* Invalid scope   */
 123 
 124         ACPI_ERROR ((AE_INFO, "Null scope parameter"));
 125         return_ACPI_STATUS (AE_BAD_PARAMETER);
 126     }
 127 
 128     /* Make sure object type is valid */
 129 
 130     if (!AcpiUtValidObjectType (Type))
 131     {
 132         ACPI_WARNING ((AE_INFO,
 133             "Invalid object type: 0x%X", Type));
 134     }
 135 
 136     /* Allocate a new scope object */
 137 
 138     ScopeInfo = AcpiUtCreateGenericState ();
 139     if (!ScopeInfo)
 140     {
 141         return_ACPI_STATUS (AE_NO_MEMORY);
 142     }
 143 
 144     /* Init new scope object */
 145 
 146     ScopeInfo->Common.DescriptorType = ACPI_DESC_TYPE_STATE_WSCOPE;
 147     ScopeInfo->Scope.Node = Node;
 148     ScopeInfo->Common.Value = (UINT16) Type;
 149 
 150     WalkState->ScopeDepth++;
 151 
 152     ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
 153         "[%.2d] Pushed scope ", (UINT32) WalkState->ScopeDepth));
 154 
 155     OldScopeInfo = WalkState->ScopeInfo;
 156     if (OldScopeInfo)
 157     {
 158         ACPI_DEBUG_PRINT_RAW ((ACPI_DB_EXEC,
 159             "[%4.4s] (%s)",
 160             AcpiUtGetNodeName (OldScopeInfo->Scope.Node),
 161             AcpiUtGetTypeName (OldScopeInfo->Common.Value)));
 162     }
 163     else
 164     {
 165         ACPI_DEBUG_PRINT_RAW ((ACPI_DB_EXEC,
 166             "[\\___] (%s)", "ROOT"));
 167     }
 168 
 169     ACPI_DEBUG_PRINT_RAW ((ACPI_DB_EXEC,
 170         ", New scope -> [%4.4s] (%s)\n",
 171         AcpiUtGetNodeName (ScopeInfo->Scope.Node),
 172         AcpiUtGetTypeName (ScopeInfo->Common.Value)));
 173 
 174     /* Push new scope object onto stack */
 175 
 176     AcpiUtPushGenericState (&WalkState->ScopeInfo, ScopeInfo);
 177     return_ACPI_STATUS (AE_OK);
 178 }
 179 
 180 
 181 /****************************************************************************
 182  *
 183  * FUNCTION:    AcpiDsScopeStackPop
 184  *
 185  * PARAMETERS:  WalkState       - Current state
 186  *
 187  * RETURN:      Status
 188  *
 189  * DESCRIPTION: Pop the scope stack once.
 190  *
 191  ***************************************************************************/
 192 
 193 ACPI_STATUS
 194 AcpiDsScopeStackPop (
 195     ACPI_WALK_STATE         *WalkState)
 196 {
 197     ACPI_GENERIC_STATE      *ScopeInfo;
 198     ACPI_GENERIC_STATE      *NewScopeInfo;
 199 
 200 
 201     ACPI_FUNCTION_TRACE (DsScopeStackPop);
 202 
 203 
 204     /*
 205      * Pop scope info object off the stack.
 206      */
 207     ScopeInfo = AcpiUtPopGenericState (&WalkState->ScopeInfo);
 208     if (!ScopeInfo)
 209     {
 210         return_ACPI_STATUS (AE_STACK_UNDERFLOW);
 211     }
 212 
 213     WalkState->ScopeDepth--;
 214 
 215     ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
 216         "[%.2d] Popped scope [%4.4s] (%s), New scope -> ",
 217         (UINT32) WalkState->ScopeDepth,
 218         AcpiUtGetNodeName (ScopeInfo->Scope.Node),
 219         AcpiUtGetTypeName (ScopeInfo->Common.Value)));
 220 
 221     NewScopeInfo = WalkState->ScopeInfo;
 222     if (NewScopeInfo)
 223     {
 224         ACPI_DEBUG_PRINT_RAW ((ACPI_DB_EXEC,
 225             "[%4.4s] (%s)\n",
 226             AcpiUtGetNodeName (NewScopeInfo->Scope.Node),
 227             AcpiUtGetTypeName (NewScopeInfo->Common.Value)));
 228     }
 229     else
 230     {
 231         ACPI_DEBUG_PRINT_RAW ((ACPI_DB_EXEC,
 232             "[\\___] (ROOT)\n"));
 233     }
 234 
 235     AcpiUtDeleteGenericState (ScopeInfo);
 236     return_ACPI_STATUS (AE_OK);
 237 }
 238 
 239