err.no Git - linux-2.6/blob - drivers/acpi/dispatcher/dswscope.c

   1 /******************************************************************************
   2  *
   3  * Module Name: dswscope - Scope stack manipulation
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2005, R. Byron Moore
   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
  45 #include <acpi/acpi.h>
  46 #include <acpi/acdispat.h>
  47
  48
  49 #define _COMPONENT          ACPI_DISPATCHER
  50          ACPI_MODULE_NAME    ("dswscope")
  51
  52
  53 /****************************************************************************
  54  *
  55  * FUNCTION:    acpi_ds_scope_stack_clear
  56  *
  57  * PARAMETERS:  walk_state      - Current state
  58  *
  59  * RETURN:      None
  60  *
  61  * DESCRIPTION: Pop (and free) everything on the scope stack except the
  62  *              root scope object (which remains at the stack top.)
  63  *
  64  ***************************************************************************/
  65
  66 void
  67 acpi_ds_scope_stack_clear (
  68         struct acpi_walk_state          *walk_state)
  69 {
  70         union acpi_generic_state        *scope_info;
  71
  72         ACPI_FUNCTION_NAME ("ds_scope_stack_clear");
  73
  74
  75         while (walk_state->scope_info) {
  76                 /* Pop a scope off the stack */
  77
  78                 scope_info = walk_state->scope_info;
  79                 walk_state->scope_info = scope_info->scope.next;
  80
  81                 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
  82                         "Popped object type (%s)\n",
  83                         acpi_ut_get_type_name (scope_info->common.value)));
  84                 acpi_ut_delete_generic_state (scope_info);
  85         }
  86 }
  87
  88
  89 /****************************************************************************
  90  *
  91  * FUNCTION:    acpi_ds_scope_stack_push
  92  *
  93  * PARAMETERS:  Node            - Name to be made current
  94  *              Type            - Type of frame being pushed
  95  *              walk_state      - Current state
  96  *
  97  * RETURN:      Status
  98  *
  99  * DESCRIPTION: Push the current scope on the scope stack, and make the
 100  *              passed Node current.
 101  *
 102  ***************************************************************************/
 103
 104 acpi_status
 105 acpi_ds_scope_stack_push (
 106         struct acpi_namespace_node      *node,
 107         acpi_object_type                type,
 108         struct acpi_walk_state          *walk_state)
 109 {
 110         union acpi_generic_state        *scope_info;
 111         union acpi_generic_state        *old_scope_info;
 112
 113
 114         ACPI_FUNCTION_TRACE ("ds_scope_stack_push");
 115
 116
 117         if (!node) {
 118                 /* Invalid scope   */
 119
 120                 ACPI_REPORT_ERROR (("ds_scope_stack_push: null scope passed\n"));
 121                 return_ACPI_STATUS (AE_BAD_PARAMETER);
 122         }
 123
 124         /* Make sure object type is valid */
 125
 126         if (!acpi_ut_valid_object_type (type)) {
 127                 ACPI_REPORT_WARNING ((
 128                         "ds_scope_stack_push: Invalid object type: 0x%X\n", type));
 129         }
 130
 131         /* Allocate a new scope object */
 132
 133         scope_info = acpi_ut_create_generic_state ();
 134         if (!scope_info) {
 135                 return_ACPI_STATUS (AE_NO_MEMORY);
 136         }
 137
 138         /* Init new scope object */
 139
 140         scope_info->common.data_type = ACPI_DESC_TYPE_STATE_WSCOPE;
 141         scope_info->scope.node      = node;
 142         scope_info->common.value    = (u16) type;
 143
 144         walk_state->scope_depth++;
 145
 146         ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
 147                 "[%.2d] Pushed scope ", (u32) walk_state->scope_depth));
 148
 149         old_scope_info = walk_state->scope_info;
 150         if (old_scope_info) {
 151                 ACPI_DEBUG_PRINT_RAW ((ACPI_DB_EXEC,
 152                         "[%4.4s] (%s)",
 153                         acpi_ut_get_node_name (old_scope_info->scope.node),
 154                         acpi_ut_get_type_name (old_scope_info->common.value)));
 155         }
 156         else {
 157                 ACPI_DEBUG_PRINT_RAW ((ACPI_DB_EXEC,
 158                         "[\\___] (%s)", "ROOT"));
 159         }
 160
 161         ACPI_DEBUG_PRINT_RAW ((ACPI_DB_EXEC,
 162                 ", New scope -> [%4.4s] (%s)\n",
 163                 acpi_ut_get_node_name (scope_info->scope.node),
 164                 acpi_ut_get_type_name (scope_info->common.value)));
 165
 166         /* Push new scope object onto stack */
 167
 168         acpi_ut_push_generic_state (&walk_state->scope_info, scope_info);
 169         return_ACPI_STATUS (AE_OK);
 170 }
 171
 172
 173 /****************************************************************************
 174  *
 175  * FUNCTION:    acpi_ds_scope_stack_pop
 176  *
 177  * PARAMETERS:  walk_state      - Current state
 178  *
 179  * RETURN:      Status
 180  *
 181  * DESCRIPTION: Pop the scope stack once.
 182  *
 183  ***************************************************************************/
 184
 185 acpi_status
 186 acpi_ds_scope_stack_pop (
 187         struct acpi_walk_state          *walk_state)
 188 {
 189         union acpi_generic_state        *scope_info;
 190         union acpi_generic_state        *new_scope_info;
 191
 192
 193         ACPI_FUNCTION_TRACE ("ds_scope_stack_pop");
 194
 195
 196         /*
 197          * Pop scope info object off the stack.
 198          */
 199         scope_info = acpi_ut_pop_generic_state (&walk_state->scope_info);
 200         if (!scope_info) {
 201                 return_ACPI_STATUS (AE_STACK_UNDERFLOW);
 202         }
 203
 204         walk_state->scope_depth--;
 205
 206         ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
 207                 "[%.2d] Popped scope [%4.4s] (%s), New scope -> ",
 208                 (u32) walk_state->scope_depth,
 209                 acpi_ut_get_node_name (scope_info->scope.node),
 210                 acpi_ut_get_type_name (scope_info->common.value)));
 211
 212         new_scope_info = walk_state->scope_info;
 213         if (new_scope_info) {
 214                 ACPI_DEBUG_PRINT_RAW ((ACPI_DB_EXEC,
 215                         "[%4.4s] (%s)\n",
 216                         acpi_ut_get_node_name (new_scope_info->scope.node),
 217                         acpi_ut_get_type_name (new_scope_info->common.value)));
 218         }
 219         else {
 220                 ACPI_DEBUG_PRINT_RAW ((ACPI_DB_EXEC,
 221                         "[\\___] (ROOT)\n"));
 222         }
 223
 224         acpi_ut_delete_generic_state (scope_info);
 225         return_ACPI_STATUS (AE_OK);
 226 }
 227
 228