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 - 2007, 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 #include <acpi/acpi.h>
  45 #include <acpi/acdispat.h>
  46
  47 #define _COMPONENT          ACPI_DISPATCHER
  48 ACPI_MODULE_NAME("dswscope")
  49
  50 /****************************************************************************
  51  *
  52  * FUNCTION:    acpi_ds_scope_stack_clear
  53  *
  54  * PARAMETERS:  walk_state      - Current state
  55  *
  56  * RETURN:      None
  57  *
  58  * DESCRIPTION: Pop (and free) everything on the scope stack except the
  59  *              root scope object (which remains at the stack top.)
  60  *
  61  ***************************************************************************/
  62 void acpi_ds_scope_stack_clear(struct acpi_walk_state *walk_state)
  63 {
  64         union acpi_generic_state *scope_info;
  65
  66         ACPI_FUNCTION_NAME(ds_scope_stack_clear);
  67
  68         while (walk_state->scope_info) {
  69
  70                 /* Pop a scope off the stack */
  71
  72                 scope_info = walk_state->scope_info;
  73                 walk_state->scope_info = scope_info->scope.next;
  74
  75                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
  76                                   "Popped object type (%s)\n",
  77                                   acpi_ut_get_type_name(scope_info->common.
  78                                                         value)));
  79                 acpi_ut_delete_generic_state(scope_info);
  80         }
  81 }
  82
  83 /****************************************************************************
  84  *
  85  * FUNCTION:    acpi_ds_scope_stack_push
  86  *
  87  * PARAMETERS:  Node            - Name to be made current
  88  *              Type            - Type of frame being pushed
  89  *              walk_state      - Current state
  90  *
  91  * RETURN:      Status
  92  *
  93  * DESCRIPTION: Push the current scope on the scope stack, and make the
  94  *              passed Node current.
  95  *
  96  ***************************************************************************/
  97
  98 acpi_status
  99 acpi_ds_scope_stack_push(struct acpi_namespace_node *node,
 100                          acpi_object_type type,
 101                          struct acpi_walk_state *walk_state)
 102 {
 103         union acpi_generic_state *scope_info;
 104         union acpi_generic_state *old_scope_info;
 105
 106         ACPI_FUNCTION_TRACE(ds_scope_stack_push);
 107
 108         if (!node) {
 109
 110                 /* Invalid scope   */
 111
 112                 ACPI_ERROR((AE_INFO, "Null scope parameter"));
 113                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 114         }
 115
 116         /* Make sure object type is valid */
 117
 118         if (!acpi_ut_valid_object_type(type)) {
 119                 ACPI_WARNING((AE_INFO, "Invalid object type: 0x%X", type));
 120         }
 121
 122         /* Allocate a new scope object */
 123
 124         scope_info = acpi_ut_create_generic_state();
 125         if (!scope_info) {
 126                 return_ACPI_STATUS(AE_NO_MEMORY);
 127         }
 128
 129         /* Init new scope object */
 130
 131         scope_info->common.descriptor_type = ACPI_DESC_TYPE_STATE_WSCOPE;
 132         scope_info->scope.node = node;
 133         scope_info->common.value = (u16) type;
 134
 135         walk_state->scope_depth++;
 136
 137         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 138                           "[%.2d] Pushed scope ",
 139                           (u32) walk_state->scope_depth));
 140
 141         old_scope_info = walk_state->scope_info;
 142         if (old_scope_info) {
 143                 ACPI_DEBUG_PRINT_RAW((ACPI_DB_EXEC,
 144                                       "[%4.4s] (%s)",
 145                                       acpi_ut_get_node_name(old_scope_info->
 146                                                             scope.node),
 147                                       acpi_ut_get_type_name(old_scope_info->
 148                                                             common.value)));
 149         } else {
 150                 ACPI_DEBUG_PRINT_RAW((ACPI_DB_EXEC, "[\\___] (%s)", "ROOT"));
 151         }
 152
 153         ACPI_DEBUG_PRINT_RAW((ACPI_DB_EXEC,
 154                               ", New scope -> [%4.4s] (%s)\n",
 155                               acpi_ut_get_node_name(scope_info->scope.node),
 156                               acpi_ut_get_type_name(scope_info->common.value)));
 157
 158         /* Push new scope object onto stack */
 159
 160         acpi_ut_push_generic_state(&walk_state->scope_info, scope_info);
 161         return_ACPI_STATUS(AE_OK);
 162 }
 163
 164 /****************************************************************************
 165  *
 166  * FUNCTION:    acpi_ds_scope_stack_pop
 167  *
 168  * PARAMETERS:  walk_state      - Current state
 169  *
 170  * RETURN:      Status
 171  *
 172  * DESCRIPTION: Pop the scope stack once.
 173  *
 174  ***************************************************************************/
 175
 176 acpi_status acpi_ds_scope_stack_pop(struct acpi_walk_state *walk_state)
 177 {
 178         union acpi_generic_state *scope_info;
 179         union acpi_generic_state *new_scope_info;
 180
 181         ACPI_FUNCTION_TRACE(ds_scope_stack_pop);
 182
 183         /*
 184          * Pop scope info object off the stack.
 185          */
 186         scope_info = acpi_ut_pop_generic_state(&walk_state->scope_info);
 187         if (!scope_info) {
 188                 return_ACPI_STATUS(AE_STACK_UNDERFLOW);
 189         }
 190
 191         walk_state->scope_depth--;
 192
 193         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 194                           "[%.2d] Popped scope [%4.4s] (%s), New scope -> ",
 195                           (u32) walk_state->scope_depth,
 196                           acpi_ut_get_node_name(scope_info->scope.node),
 197                           acpi_ut_get_type_name(scope_info->common.value)));
 198
 199         new_scope_info = walk_state->scope_info;
 200         if (new_scope_info) {
 201                 ACPI_DEBUG_PRINT_RAW((ACPI_DB_EXEC,
 202                                       "[%4.4s] (%s)\n",
 203                                       acpi_ut_get_node_name(new_scope_info->
 204                                                             scope.node),
 205                                       acpi_ut_get_type_name(new_scope_info->
 206                                                             common.value)));
 207         } else {
 208                 ACPI_DEBUG_PRINT_RAW((ACPI_DB_EXEC, "[\\___] (ROOT)\n"));
 209         }
 210
 211         acpi_ut_delete_generic_state(scope_info);
 212         return_ACPI_STATUS(AE_OK);
 213 }