1 /****************************************************************************** 2 * 3 * Module Name: dswscope - Scope stack manipulation 4 * 5 *****************************************************************************/ 6 7 /* 8 * Copyright (C) 2000 - 2012, 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