drivers/acpi/acpica/dswscope.c

   1 /******************************************************************************
   2  *
   3  * Module Name: dswscope - Scope stack manipulation
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2010, 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 #include <acpi/acpi.h>
  45 #include "accommon.h"
  46 #include "acdispat.h"
  47
  48 #define _COMPONENT          ACPI_DISPATCHER
  49 ACPI_MODULE_NAME("dswscope")
  50
  51 /****************************************************************************
  52  *
  53  * FUNCTION:    acpi_ds_scope_stack_clear
  54  *
  55  * PARAMETERS:  walk_state      - Current state
  56  *
  57  * RETURN:      None
  58  *
  59  * DESCRIPTION: Pop (and free) everything on the scope stack except the
  60  *              root scope object (which remains at the stack top.)
  61  *
  62  ***************************************************************************/
  63 void acpi_ds_scope_stack_clear(struct acpi_walk_state *walk_state)
  64 {
  65         union acpi_generic_state *scope_info;
  66
  67         ACPI_FUNCTION_NAME(ds_scope_stack_clear);
  68
  69         while (walk_state->scope_info) {
  70
  71                 /* Pop a scope off the stack */
  72
  73                 scope_info = walk_state->scope_info;
  74                 walk_state->scope_info = scope_info->scope.next;
  75
  76                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
  77                                   "Popped object type (%s)\n",
  78                                   acpi_ut_get_type_name(scope_info->common.
  79                                                         value)));
  80                 acpi_ut_delete_generic_state(scope_info);
  81         }
  82 }
  83
  84 /****************************************************************************
  85  *
  86  * FUNCTION:    acpi_ds_scope_stack_push
  87  *
  88  * PARAMETERS:  Node            - Name to be made current
  89  *              Type            - Type of frame being pushed
  90  *              walk_state      - Current state
  91  *
  92  * RETURN:      Status
  93  *
  94  * DESCRIPTION: Push the current scope on the scope stack, and make the
  95  *              passed Node current.
  96  *
  97  ***************************************************************************/
  98
  99 acpi_status
 100 acpi_ds_scope_stack_push(struct acpi_namespace_node *node,
 101                          acpi_object_type type,
 102                          struct acpi_walk_state *walk_state)
 103 {
 104         union acpi_generic_state *scope_info;
 105         union acpi_generic_state *old_scope_info;
 106
 107         ACPI_FUNCTION_TRACE(ds_scope_stack_push);
 108
 109         if (!node) {
 110
 111                 /* Invalid scope   */
 112
 113                 ACPI_ERROR((AE_INFO, "Null scope parameter"));
 114                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 115         }
 116
 117         /* Make sure object type is valid */
 118
 119         if (!acpi_ut_valid_object_type(type)) {
 120                 ACPI_WARNING((AE_INFO, "Invalid object type: 0x%X", type));
 121         }
 122
 123         /* Allocate a new scope object */
 124
 125         scope_info = acpi_ut_create_generic_state();
 126         if (!scope_info) {
 127                 return_ACPI_STATUS(AE_NO_MEMORY);
 128         }
 129
 130         /* Init new scope object */
 131
 132         scope_info->common.descriptor_type = ACPI_DESC_TYPE_STATE_WSCOPE;
 133         scope_info->scope.node = node;
 134         scope_info->common.value = (u16) type;
 135
 136         walk_state->scope_depth++;
 137
 138         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 139                           "[%.2d] Pushed scope ",
 140                           (u32) walk_state->scope_depth));
 141
 142         old_scope_info = walk_state->scope_info;
 143         if (old_scope_info) {
 144                 ACPI_DEBUG_PRINT_RAW((ACPI_DB_EXEC,
 145                                       "[%4.4s] (%s)",
 146                                       acpi_ut_get_node_name(old_scope_info->
 147                                                             scope.node),
 148                                       acpi_ut_get_type_name(old_scope_info->
 149                                                             common.value)));
 150         } else {
 151                 ACPI_DEBUG_PRINT_RAW((ACPI_DB_EXEC, "[\\___] (%s)", "ROOT"));
 152         }
 153
 154         ACPI_DEBUG_PRINT_RAW((ACPI_DB_EXEC,
 155                               ", New scope -> [%4.4s] (%s)\n",
 156                               acpi_ut_get_node_name(scope_info->scope.node),
 157                               acpi_ut_get_type_name(scope_info->common.value)));
 158
 159         /* Push new scope object onto stack */
 160
 161         acpi_ut_push_generic_state(&walk_state->scope_info, scope_info);
 162         return_ACPI_STATUS(AE_OK);
 163 }
 164
 165 /****************************************************************************
 166  *
 167  * FUNCTION:    acpi_ds_scope_stack_pop
 168  *
 169  * PARAMETERS:  walk_state      - Current state
 170  *
 171  * RETURN:      Status
 172  *
 173  * DESCRIPTION: Pop the scope stack once.
 174  *
 175  ***************************************************************************/
 176
 177 acpi_status acpi_ds_scope_stack_pop(struct acpi_walk_state *walk_state)
 178 {
 179         union acpi_generic_state *scope_info;
 180         union acpi_generic_state *new_scope_info;
 181
 182         ACPI_FUNCTION_TRACE(ds_scope_stack_pop);
 183
 184         /*
 185          * Pop scope info object off the stack.
 186          */
 187         scope_info = acpi_ut_pop_generic_state(&walk_state->scope_info);
 188         if (!scope_info) {
 189                 return_ACPI_STATUS(AE_STACK_UNDERFLOW);
 190         }
 191
 192         walk_state->scope_depth--;
 193
 194         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 195                           "[%.2d] Popped scope [%4.4s] (%s), New scope -> ",
 196                           (u32) walk_state->scope_depth,
 197                           acpi_ut_get_node_name(scope_info->scope.node),
 198                           acpi_ut_get_type_name(scope_info->common.value)));
 199
 200         new_scope_info = walk_state->scope_info;
 201         if (new_scope_info) {
 202                 ACPI_DEBUG_PRINT_RAW((ACPI_DB_EXEC,
 203                                       "[%4.4s] (%s)\n",
 204                                       acpi_ut_get_node_name(new_scope_info->
 205                                                             scope.node),
 206                                       acpi_ut_get_type_name(new_scope_info->
 207                                                             common.value)));
 208         } else {
 209                 ACPI_DEBUG_PRINT_RAW((ACPI_DB_EXEC, "[\\___] (ROOT)\n"));
 210         }
 211
 212         acpi_ut_delete_generic_state(scope_info);
 213         return_ACPI_STATUS(AE_OK);
 214 }