1 /****************************************************************************** 2 * 3 * Module Name: dswscope - Scope stack manipulation 4 * 5 *****************************************************************************/ 6 7 /* 8 * Copyright (C) 2000 - 2017, 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 } 216