drivers/acpi/acpica/dswscope.c

   1 /******************************************************************************
   2  *
   3  * Module Name: dswscope - Scope stack manipulation
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2016, 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
  81                 acpi_ut_delete_generic_state(scope_info);
  82         }
  83 }
  84
  85 /****************************************************************************
  86  *
  87  * FUNCTION:    acpi_ds_scope_stack_push
  88  *
  89  * PARAMETERS:  node            - Name to be made current
  90  *              type            - Type of frame being pushed
  91  *              walk_state      - Current state
  92  *
  93  * RETURN:      Status
  94  *
  95  * DESCRIPTION: Push the current scope on the scope stack, and make the
  96  *              passed Node current.
  97  *
  98  ***************************************************************************/
  99
 100 acpi_status
 101 acpi_ds_scope_stack_push(struct acpi_namespace_node *node,
 102                          acpi_object_type type,
 103                          struct acpi_walk_state *walk_state)
 104 {
 105         union acpi_generic_state *scope_info;
 106         union acpi_generic_state *old_scope_info;
 107
 108         ACPI_FUNCTION_TRACE(ds_scope_stack_push);
 109
 110         if (!node) {
 111
 112                 /* Invalid scope   */
 113
 114                 ACPI_ERROR((AE_INFO, "Null scope parameter"));
 115                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 116         }
 117
 118         /* Make sure object type is valid */
 119
 120         if (!acpi_ut_valid_object_type(type)) {
 121                 ACPI_WARNING((AE_INFO, "Invalid object type: 0x%X", type));
 122         }
 123
 124         /* Allocate a new scope object */
 125
 126         scope_info = acpi_ut_create_generic_state();
 127         if (!scope_info) {
 128                 return_ACPI_STATUS(AE_NO_MEMORY);
 129         }
 130
 131         /* Init new scope object */
 132
 133         scope_info->common.descriptor_type = ACPI_DESC_TYPE_STATE_WSCOPE;
 134         scope_info->scope.node = node;
 135         scope_info->common.value = (u16) type;
 136
 137         walk_state->scope_depth++;
 138
 139         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 140                           "[%.2d] Pushed scope ",
 141                           (u32) walk_state->scope_depth));
 142
 143         old_scope_info = walk_state->scope_info;
 144         if (old_scope_info) {
 145                 ACPI_DEBUG_PRINT_RAW((ACPI_DB_EXEC,
 146                                       "[%4.4s] (%s)",
 147                                       acpi_ut_get_node_name(old_scope_info->
 148                                                             scope.node),
 149                                       acpi_ut_get_type_name(old_scope_info->
 150                                                             common.value)));
 151         } else {
 152                 ACPI_DEBUG_PRINT_RAW((ACPI_DB_EXEC, "[\\___] (%s)", "ROOT"));
 153         }
 154
 155         ACPI_DEBUG_PRINT_RAW((ACPI_DB_EXEC,
 156                               ", New scope -> [%4.4s] (%s)\n",
 157                               acpi_ut_get_node_name(scope_info->scope.node),
 158                               acpi_ut_get_type_name(scope_info->common.value)));
 159
 160         /* Push new scope object onto stack */
 161
 162         acpi_ut_push_generic_state(&walk_state->scope_info, scope_info);
 163         return_ACPI_STATUS(AE_OK);
 164 }
 165
 166 /****************************************************************************
 167  *
 168  * FUNCTION:    acpi_ds_scope_stack_pop
 169  *
 170  * PARAMETERS:  walk_state      - Current state
 171  *
 172  * RETURN:      Status
 173  *
 174  * DESCRIPTION: Pop the scope stack once.
 175  *
 176  ***************************************************************************/
 177
 178 acpi_status acpi_ds_scope_stack_pop(struct acpi_walk_state *walk_state)
 179 {
 180         union acpi_generic_state *scope_info;
 181         union acpi_generic_state *new_scope_info;
 182
 183         ACPI_FUNCTION_TRACE(ds_scope_stack_pop);
 184
 185         /*
 186          * Pop scope info object off the stack.
 187          */
 188         scope_info = acpi_ut_pop_generic_state(&walk_state->scope_info);
 189         if (!scope_info) {
 190                 return_ACPI_STATUS(AE_STACK_UNDERFLOW);
 191         }
 192
 193         walk_state->scope_depth--;
 194
 195         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 196                           "[%.2d] Popped scope [%4.4s] (%s), New scope -> ",
 197                           (u32) walk_state->scope_depth,
 198                           acpi_ut_get_node_name(scope_info->scope.node),
 199                           acpi_ut_get_type_name(scope_info->common.value)));
 200
 201         new_scope_info = walk_state->scope_info;
 202         if (new_scope_info) {
 203                 ACPI_DEBUG_PRINT_RAW((ACPI_DB_EXEC,
 204                                       "[%4.4s] (%s)\n",
 205                                       acpi_ut_get_node_name(new_scope_info->
 206                                                             scope.node),
 207                                       acpi_ut_get_type_name(new_scope_info->
 208                                                             common.value)));
 209         } else {
 210                 ACPI_DEBUG_PRINT_RAW((ACPI_DB_EXEC, "[\\___] (ROOT)\n"));
 211         }
 212
 213         acpi_ut_delete_generic_state(scope_info);
 214         return_ACPI_STATUS(AE_OK);
 215 }