1/****************************************************************************** 2 * 3 * Module Name: dswscope - Scope stack manipulation 4 * 5 *****************************************************************************/ 6 7/* 8 * Copyright (C) 2000 - 2007, R. Byron Moore 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 <acpi/acdispat.h> 46 47#define _COMPONENT ACPI_DISPATCHER 48ACPI_MODULE_NAME("dswscope") 49 50/**************************************************************************** 51 * 52 * FUNCTION: acpi_ds_scope_stack_clear 53 * 54 * PARAMETERS: walk_state - Current state 55 * 56 * RETURN: None 57 * 58 * DESCRIPTION: Pop (and free) everything on the scope stack except the 59 * root scope object (which remains at the stack top.) 60 * 61 ***************************************************************************/ 62void acpi_ds_scope_stack_clear(struct acpi_walk_state *walk_state) 63{ 64 union acpi_generic_state *scope_info; 65 66 ACPI_FUNCTION_NAME(ds_scope_stack_clear); 67 68 while (walk_state->scope_info) { 69 70 /* Pop a scope off the stack */ 71 72 scope_info = walk_state->scope_info; 73 walk_state->scope_info = scope_info->scope.next; 74 75 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, 76 "Popped object type (%s)\n", 77 acpi_ut_get_type_name(scope_info->common. 78 value))); 79 acpi_ut_delete_generic_state(scope_info); 80 } 81} 82 83/**************************************************************************** 84 * 85 * FUNCTION: acpi_ds_scope_stack_push 86 * 87 * PARAMETERS: Node - Name to be made current 88 * Type - Type of frame being pushed 89 * walk_state - Current state 90 * 91 * RETURN: Status 92 * 93 * DESCRIPTION: Push the current scope on the scope stack, and make the 94 * passed Node current. 95 * 96 ***************************************************************************/ 97 98acpi_status 99acpi_ds_scope_stack_push(struct acpi_namespace_node *node, 100 acpi_object_type type, 101 struct acpi_walk_state *walk_state) 102{ 103 union acpi_generic_state *scope_info; 104 union acpi_generic_state *old_scope_info; 105 106 ACPI_FUNCTION_TRACE(ds_scope_stack_push); 107 108 if (!node) { 109 110 /* Invalid scope */ 111 112 ACPI_ERROR((AE_INFO, "Null scope parameter")); 113 return_ACPI_STATUS(AE_BAD_PARAMETER); 114 } 115 116 /* Make sure object type is valid */ 117 118 if (!acpi_ut_valid_object_type(type)) { 119 ACPI_WARNING((AE_INFO, "Invalid object type: 0x%X", type)); 120 } 121 122 /* Allocate a new scope object */ 123 124 scope_info = acpi_ut_create_generic_state(); 125 if (!scope_info) { 126 return_ACPI_STATUS(AE_NO_MEMORY); 127 } 128 129 /* Init new scope object */ 130 131 scope_info->common.descriptor_type = ACPI_DESC_TYPE_STATE_WSCOPE; 132 scope_info->scope.node = node; 133 scope_info->common.value = (u16) type; 134 135 walk_state->scope_depth++; 136 137 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, 138 "[%.2d] Pushed scope ", 139 (u32) walk_state->scope_depth)); 140 141 old_scope_info = walk_state->scope_info; 142 if (old_scope_info) { 143 ACPI_DEBUG_PRINT_RAW((ACPI_DB_EXEC, 144 "[%4.4s] (%s)", 145 acpi_ut_get_node_name(old_scope_info-> 146 scope.node), 147 acpi_ut_get_type_name(old_scope_info-> 148 common.value))); 149 } else { 150 ACPI_DEBUG_PRINT_RAW((ACPI_DB_EXEC, "[\\___] (%s)", "ROOT")); 151 } 152 153 ACPI_DEBUG_PRINT_RAW((ACPI_DB_EXEC, 154 ", New scope -> [%4.4s] (%s)\n", 155 acpi_ut_get_node_name(scope_info->scope.node), 156 acpi_ut_get_type_name(scope_info->common.value))); 157 158 /* Push new scope object onto stack */ 159 160 acpi_ut_push_generic_state(&walk_state->scope_info, scope_info); 161 return_ACPI_STATUS(AE_OK); 162} 163 164/**************************************************************************** 165 * 166 * FUNCTION: acpi_ds_scope_stack_pop 167 * 168 * PARAMETERS: walk_state - Current state 169 * 170 * RETURN: Status 171 * 172 * DESCRIPTION: Pop the scope stack once. 173 * 174 ***************************************************************************/ 175 176acpi_status acpi_ds_scope_stack_pop(struct acpi_walk_state *walk_state) 177{ 178 union acpi_generic_state *scope_info; 179 union acpi_generic_state *new_scope_info; 180 181 ACPI_FUNCTION_TRACE(ds_scope_stack_pop); 182 183 /* 184 * Pop scope info object off the stack. 185 */ 186 scope_info = acpi_ut_pop_generic_state(&walk_state->scope_info); 187 if (!scope_info) { 188 return_ACPI_STATUS(AE_STACK_UNDERFLOW); 189 } 190 191 walk_state->scope_depth--; 192 193 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, 194 "[%.2d] Popped scope [%4.4s] (%s), New scope -> ", 195 (u32) walk_state->scope_depth, 196 acpi_ut_get_node_name(scope_info->scope.node), 197 acpi_ut_get_type_name(scope_info->common.value))); 198 199 new_scope_info = walk_state->scope_info; 200 if (new_scope_info) { 201 ACPI_DEBUG_PRINT_RAW((ACPI_DB_EXEC, 202 "[%4.4s] (%s)\n", 203 acpi_ut_get_node_name(new_scope_info-> 204 scope.node), 205 acpi_ut_get_type_name(new_scope_info-> 206 common.value))); 207 } else { 208 ACPI_DEBUG_PRINT_RAW((ACPI_DB_EXEC, "[\\___] (ROOT)\n")); 209 } 210 211 acpi_ut_delete_generic_state(scope_info); 212 return_ACPI_STATUS(AE_OK); 213} 214