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  1. /******************************************************************************
  2.  *
  3.  * Module Name: dswscope - Scope stack manipulation
  4.  *
  5.  *****************************************************************************/
  6.  
  7. /*
  8.  * Copyright (C) 2000 - 2015, 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. }
  215.