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 - 2008, 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         /* Get the info structure for this opcode */
  78
  79         op_info = acpi_ps_get_opcode_info(op->common.aml_opcode);
  80         if (op_info->class == AML_CLASS_UNKNOWN) {
  81
  82                 /* Invalid opcode or ASCII character */
  83
  84                 return (NULL);
  85         }
  86
  87         /* Check if this opcode requires argument sub-objects */
  88
  89         if (!(op_info->flags & AML_HAS_ARGS)) {
  90
  91                 /* Has no linked argument objects */
  92
  93                 return (NULL);
  94         }
  95
  96         /* Get the requested argument object */
  97
  98         arg = op->common.value.arg;
  99         while (arg && argn) {
 100                 argn--;
 101                 arg = arg->common.next;
 102         }
 103
 104         return (arg);
 105 }
 106
 107 /*******************************************************************************
 108  *
 109  * FUNCTION:    acpi_ps_append_arg
 110  *
 111  * PARAMETERS:  Op              - Append an argument to this Op.
 112  *              Arg             - Argument Op to append
 113  *
 114  * RETURN:      None.
 115  *
 116  * DESCRIPTION: Append an argument to an op's argument list (a NULL arg is OK)
 117  *
 118  ******************************************************************************/
 119
 120 void
 121 acpi_ps_append_arg(union acpi_parse_object *op, union acpi_parse_object *arg)
 122 {
 123         union acpi_parse_object *prev_arg;
 124         const struct acpi_opcode_info *op_info;
 125
 126         ACPI_FUNCTION_ENTRY();
 127
 128         if (!op) {
 129                 return;
 130         }
 131
 132         /* Get the info structure for this opcode */
 133
 134         op_info = acpi_ps_get_opcode_info(op->common.aml_opcode);
 135         if (op_info->class == AML_CLASS_UNKNOWN) {
 136
 137                 /* Invalid opcode */
 138
 139                 ACPI_ERROR((AE_INFO, "Invalid AML Opcode: 0x%2.2X",
 140                             op->common.aml_opcode));
 141                 return;
 142         }
 143
 144         /* Check if this opcode requires argument sub-objects */
 145
 146         if (!(op_info->flags & AML_HAS_ARGS)) {
 147
 148                 /* Has no linked argument objects */
 149
 150                 return;
 151         }
 152
 153         /* Append the argument to the linked argument list */
 154
 155         if (op->common.value.arg) {
 156
 157                 /* Append to existing argument list */
 158
 159                 prev_arg = op->common.value.arg;
 160                 while (prev_arg->common.next) {
 161                         prev_arg = prev_arg->common.next;
 162                 }
 163                 prev_arg->common.next = arg;
 164         } else {
 165                 /* No argument list, this will be the first argument */
 166
 167                 op->common.value.arg = arg;
 168         }
 169
 170         /* Set the parent in this arg and any args linked after it */
 171
 172         while (arg) {
 173                 arg->common.parent = op;
 174                 arg = arg->common.next;
 175
 176                 op->common.arg_list_length++;
 177         }
 178 }
 179
 180 #ifdef ACPI_FUTURE_USAGE
 181 /*******************************************************************************
 182  *
 183  * FUNCTION:    acpi_ps_get_depth_next
 184  *
 185  * PARAMETERS:  Origin          - Root of subtree to search
 186  *              Op              - Last (previous) Op that was found
 187  *
 188  * RETURN:      Next Op found in the search.
 189  *
 190  * DESCRIPTION: Get next op in tree (walking the tree in depth-first order)
 191  *              Return NULL when reaching "origin" or when walking up from root
 192  *
 193  ******************************************************************************/
 194
 195 union acpi_parse_object *acpi_ps_get_depth_next(union acpi_parse_object *origin,
 196                                                 union acpi_parse_object *op)
 197 {
 198         union acpi_parse_object *next = NULL;
 199         union acpi_parse_object *parent;
 200         union acpi_parse_object *arg;
 201
 202         ACPI_FUNCTION_ENTRY();
 203
 204         if (!op) {
 205                 return (NULL);
 206         }
 207
 208         /* Look for an argument or child */
 209
 210         next = acpi_ps_get_arg(op, 0);
 211         if (next) {
 212                 return (next);
 213         }
 214
 215         /* Look for a sibling */
 216
 217         next = op->common.next;
 218         if (next) {
 219                 return (next);
 220         }
 221
 222         /* Look for a sibling of parent */
 223
 224         parent = op->common.parent;
 225
 226         while (parent) {
 227                 arg = acpi_ps_get_arg(parent, 0);
 228                 while (arg && (arg != origin) && (arg != op)) {
 229                         arg = arg->common.next;
 230                 }
 231
 232                 if (arg == origin) {
 233
 234                         /* Reached parent of origin, end search */
 235
 236                         return (NULL);
 237                 }
 238
 239                 if (parent->common.next) {
 240
 241                         /* Found sibling of parent */
 242
 243                         return (parent->common.next);
 244                 }
 245
 246                 op = parent;
 247                 parent = parent->common.parent;
 248         }
 249
 250         return (next);
 251 }
 252
 253 #ifdef ACPI_OBSOLETE_FUNCTIONS
 254 /*******************************************************************************
 255  *
 256  * FUNCTION:    acpi_ps_get_child
 257  *
 258  * PARAMETERS:  Op              - Get the child of this Op
 259  *
 260  * RETURN:      Child Op, Null if none is found.
 261  *
 262  * DESCRIPTION: Get op's children or NULL if none
 263  *
 264  ******************************************************************************/
 265
 266 union acpi_parse_object *acpi_ps_get_child(union acpi_parse_object *op)
 267 {
 268         union acpi_parse_object *child = NULL;
 269
 270         ACPI_FUNCTION_ENTRY();
 271
 272         switch (op->common.aml_opcode) {
 273         case AML_SCOPE_OP:
 274         case AML_ELSE_OP:
 275         case AML_DEVICE_OP:
 276         case AML_THERMAL_ZONE_OP:
 277         case AML_INT_METHODCALL_OP:
 278
 279                 child = acpi_ps_get_arg(op, 0);
 280                 break;
 281
 282         case AML_BUFFER_OP:
 283         case AML_PACKAGE_OP:
 284         case AML_METHOD_OP:
 285         case AML_IF_OP:
 286         case AML_WHILE_OP:
 287         case AML_FIELD_OP:
 288
 289                 child = acpi_ps_get_arg(op, 1);
 290                 break;
 291
 292         case AML_POWER_RES_OP:
 293         case AML_INDEX_FIELD_OP:
 294
 295                 child = acpi_ps_get_arg(op, 2);
 296                 break;
 297
 298         case AML_PROCESSOR_OP:
 299         case AML_BANK_FIELD_OP:
 300
 301                 child = acpi_ps_get_arg(op, 3);
 302                 break;
 303
 304         default:
 305                 /* All others have no children */
 306                 break;
 307         }
 308
 309         return (child);
 310 }
 311 #endif
 312 #endif                          /*  ACPI_FUTURE_USAGE  */