drivers/acpi/acpica/pstree.c

   1 /******************************************************************************
   2  *
   3  * Module Name: pstree - Parser op tree manipulation/traversal/search
   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 "acparser.h"
  47 #include "amlcode.h"
  48
  49 #define _COMPONENT          ACPI_PARSER
  50 ACPI_MODULE_NAME("pstree")
  51
  52 /* Local prototypes */
  53 #ifdef ACPI_OBSOLETE_FUNCTIONS
  54 union acpi_parse_object *acpi_ps_get_child(union acpi_parse_object *op);
  55 #endif
  56
  57 /*******************************************************************************
  58  *
  59  * FUNCTION:    acpi_ps_get_arg
  60  *
  61  * PARAMETERS:  Op              - Get an argument for this op
  62  *              Argn            - Nth argument to get
  63  *
  64  * RETURN:      The argument (as an Op object). NULL if argument does not exist
  65  *
  66  * DESCRIPTION: Get the specified op's argument.
  67  *
  68  ******************************************************************************/
  69
  70 union acpi_parse_object *acpi_ps_get_arg(union acpi_parse_object *op, u32 argn)
  71 {
  72         union acpi_parse_object *arg = NULL;
  73         const struct acpi_opcode_info *op_info;
  74
  75         ACPI_FUNCTION_ENTRY();
  76
  77 /*
  78         if (Op->Common.aml_opcode == AML_INT_CONNECTION_OP)
  79         {
  80                 return (Op->Common.Value.Arg);
  81         }
  82 */
  83         /* Get the info structure for this opcode */
  84
  85         op_info = acpi_ps_get_opcode_info(op->common.aml_opcode);
  86         if (op_info->class == AML_CLASS_UNKNOWN) {
  87
  88                 /* Invalid opcode or ASCII character */
  89
  90                 return (NULL);
  91         }
  92
  93         /* Check if this opcode requires argument sub-objects */
  94
  95         if (!(op_info->flags & AML_HAS_ARGS)) {
  96
  97                 /* Has no linked argument objects */
  98
  99                 return (NULL);
 100         }
 101
 102         /* Get the requested argument object */
 103
 104         arg = op->common.value.arg;
 105         while (arg && argn) {
 106                 argn--;
 107                 arg = arg->common.next;
 108         }
 109
 110         return (arg);
 111 }
 112
 113 /*******************************************************************************
 114  *
 115  * FUNCTION:    acpi_ps_append_arg
 116  *
 117  * PARAMETERS:  Op              - Append an argument to this Op.
 118  *              Arg             - Argument Op to append
 119  *
 120  * RETURN:      None.
 121  *
 122  * DESCRIPTION: Append an argument to an op's argument list (a NULL arg is OK)
 123  *
 124  ******************************************************************************/
 125
 126 void
 127 acpi_ps_append_arg(union acpi_parse_object *op, union acpi_parse_object *arg)
 128 {
 129         union acpi_parse_object *prev_arg;
 130         const struct acpi_opcode_info *op_info;
 131
 132         ACPI_FUNCTION_ENTRY();
 133
 134         if (!op) {
 135                 return;
 136         }
 137
 138         /* Get the info structure for this opcode */
 139
 140         op_info = acpi_ps_get_opcode_info(op->common.aml_opcode);
 141         if (op_info->class == AML_CLASS_UNKNOWN) {
 142
 143                 /* Invalid opcode */
 144
 145                 ACPI_ERROR((AE_INFO, "Invalid AML Opcode: 0x%2.2X",
 146                             op->common.aml_opcode));
 147                 return;
 148         }
 149
 150         /* Check if this opcode requires argument sub-objects */
 151
 152         if (!(op_info->flags & AML_HAS_ARGS)) {
 153
 154                 /* Has no linked argument objects */
 155
 156                 return;
 157         }
 158
 159         /* Append the argument to the linked argument list */
 160
 161         if (op->common.value.arg) {
 162
 163                 /* Append to existing argument list */
 164
 165                 prev_arg = op->common.value.arg;
 166                 while (prev_arg->common.next) {
 167                         prev_arg = prev_arg->common.next;
 168                 }
 169                 prev_arg->common.next = arg;
 170         } else {
 171                 /* No argument list, this will be the first argument */
 172
 173                 op->common.value.arg = arg;
 174         }
 175
 176         /* Set the parent in this arg and any args linked after it */
 177
 178         while (arg) {
 179                 arg->common.parent = op;
 180                 arg = arg->common.next;
 181
 182                 op->common.arg_list_length++;
 183         }
 184 }
 185
 186 #ifdef ACPI_FUTURE_USAGE
 187 /*******************************************************************************
 188  *
 189  * FUNCTION:    acpi_ps_get_depth_next
 190  *
 191  * PARAMETERS:  Origin          - Root of subtree to search
 192  *              Op              - Last (previous) Op that was found
 193  *
 194  * RETURN:      Next Op found in the search.
 195  *
 196  * DESCRIPTION: Get next op in tree (walking the tree in depth-first order)
 197  *              Return NULL when reaching "origin" or when walking up from root
 198  *
 199  ******************************************************************************/
 200
 201 union acpi_parse_object *acpi_ps_get_depth_next(union acpi_parse_object *origin,
 202                                                 union acpi_parse_object *op)
 203 {
 204         union acpi_parse_object *next = NULL;
 205         union acpi_parse_object *parent;
 206         union acpi_parse_object *arg;
 207
 208         ACPI_FUNCTION_ENTRY();
 209
 210         if (!op) {
 211                 return (NULL);
 212         }
 213
 214         /* Look for an argument or child */
 215
 216         next = acpi_ps_get_arg(op, 0);
 217         if (next) {
 218                 return (next);
 219         }
 220
 221         /* Look for a sibling */
 222
 223         next = op->common.next;
 224         if (next) {
 225                 return (next);
 226         }
 227
 228         /* Look for a sibling of parent */
 229
 230         parent = op->common.parent;
 231
 232         while (parent) {
 233                 arg = acpi_ps_get_arg(parent, 0);
 234                 while (arg && (arg != origin) && (arg != op)) {
 235                         arg = arg->common.next;
 236                 }
 237
 238                 if (arg == origin) {
 239
 240                         /* Reached parent of origin, end search */
 241
 242                         return (NULL);
 243                 }
 244
 245                 if (parent->common.next) {
 246
 247                         /* Found sibling of parent */
 248
 249                         return (parent->common.next);
 250                 }
 251
 252                 op = parent;
 253                 parent = parent->common.parent;
 254         }
 255
 256         return (next);
 257 }
 258
 259 #ifdef ACPI_OBSOLETE_FUNCTIONS
 260 /*******************************************************************************
 261  *
 262  * FUNCTION:    acpi_ps_get_child
 263  *
 264  * PARAMETERS:  Op              - Get the child of this Op
 265  *
 266  * RETURN:      Child Op, Null if none is found.
 267  *
 268  * DESCRIPTION: Get op's children or NULL if none
 269  *
 270  ******************************************************************************/
 271
 272 union acpi_parse_object *acpi_ps_get_child(union acpi_parse_object *op)
 273 {
 274         union acpi_parse_object *child = NULL;
 275
 276         ACPI_FUNCTION_ENTRY();
 277
 278         switch (op->common.aml_opcode) {
 279         case AML_SCOPE_OP:
 280         case AML_ELSE_OP:
 281         case AML_DEVICE_OP:
 282         case AML_THERMAL_ZONE_OP:
 283         case AML_INT_METHODCALL_OP:
 284
 285                 child = acpi_ps_get_arg(op, 0);
 286                 break;
 287
 288         case AML_BUFFER_OP:
 289         case AML_PACKAGE_OP:
 290         case AML_METHOD_OP:
 291         case AML_IF_OP:
 292         case AML_WHILE_OP:
 293         case AML_FIELD_OP:
 294
 295                 child = acpi_ps_get_arg(op, 1);
 296                 break;
 297
 298         case AML_POWER_RES_OP:
 299         case AML_INDEX_FIELD_OP:
 300
 301                 child = acpi_ps_get_arg(op, 2);
 302                 break;
 303
 304         case AML_PROCESSOR_OP:
 305         case AML_BANK_FIELD_OP:
 306
 307                 child = acpi_ps_get_arg(op, 3);
 308                 break;
 309
 310         default:
 311                 /* All others have no children */
 312                 break;
 313         }
 314
 315         return (child);
 316 }
 317 #endif
 318 #endif                          /*  ACPI_FUTURE_USAGE  */