drivers/acpi/parser/pstree.c

   1 /******************************************************************************
   2  *
   3  * Module Name: pstree - Parser op tree manipulation/traversal/search
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2006, 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/acparser.h>
  46 #include <acpi/amlcode.h>
  47
  48 #define _COMPONENT          ACPI_PARSER
  49 ACPI_MODULE_NAME("pstree")
  50
  51 /* Local prototypes */
  52 #ifdef ACPI_OBSOLETE_FUNCTIONS
  53 union acpi_parse_object *acpi_ps_get_child(union acpi_parse_object *op);
  54 #endif
  55
  56 /*******************************************************************************
  57  *
  58  * FUNCTION:    acpi_ps_get_arg
  59  *
  60  * PARAMETERS:  Op              - Get an argument for this op
  61  *              Argn            - Nth argument to get
  62  *
  63  * RETURN:      The argument (as an Op object). NULL if argument does not exist
  64  *
  65  * DESCRIPTION: Get the specified op's argument.
  66  *
  67  ******************************************************************************/
  68
  69 union acpi_parse_object *acpi_ps_get_arg(union acpi_parse_object *op, u32 argn)
  70 {
  71         union acpi_parse_object *arg = NULL;
  72         const struct acpi_opcode_info *op_info;
  73
  74         ACPI_FUNCTION_ENTRY();
  75
  76         /* Get the info structure for this opcode */
  77
  78         op_info = acpi_ps_get_opcode_info(op->common.aml_opcode);
  79         if (op_info->class == AML_CLASS_UNKNOWN) {
  80                 /* Invalid opcode or ASCII character */
  81
  82                 return (NULL);
  83         }
  84
  85         /* Check if this opcode requires argument sub-objects */
  86
  87         if (!(op_info->flags & AML_HAS_ARGS)) {
  88                 /* Has no linked argument objects */
  89
  90                 return (NULL);
  91         }
  92
  93         /* Get the requested argument object */
  94
  95         arg = op->common.value.arg;
  96         while (arg && argn) {
  97                 argn--;
  98                 arg = arg->common.next;
  99         }
 100
 101         return (arg);
 102 }
 103
 104 /*******************************************************************************
 105  *
 106  * FUNCTION:    acpi_ps_append_arg
 107  *
 108  * PARAMETERS:  Op              - Append an argument to this Op.
 109  *              Arg             - Argument Op to append
 110  *
 111  * RETURN:      None.
 112  *
 113  * DESCRIPTION: Append an argument to an op's argument list (a NULL arg is OK)
 114  *
 115  ******************************************************************************/
 116
 117 void
 118 acpi_ps_append_arg(union acpi_parse_object *op, union acpi_parse_object *arg)
 119 {
 120         union acpi_parse_object *prev_arg;
 121         const struct acpi_opcode_info *op_info;
 122
 123         ACPI_FUNCTION_ENTRY();
 124
 125         if (!op) {
 126                 return;
 127         }
 128
 129         /* Get the info structure for this opcode */
 130
 131         op_info = acpi_ps_get_opcode_info(op->common.aml_opcode);
 132         if (op_info->class == AML_CLASS_UNKNOWN) {
 133                 /* Invalid opcode */
 134
 135                 ACPI_ERROR((AE_INFO, "Invalid AML Opcode: 0x%2.2X",
 136                             op->common.aml_opcode));
 137                 return;
 138         }
 139
 140         /* Check if this opcode requires argument sub-objects */
 141
 142         if (!(op_info->flags & AML_HAS_ARGS)) {
 143                 /* Has no linked argument objects */
 144
 145                 return;
 146         }
 147
 148         /* Append the argument to the linked argument list */
 149
 150         if (op->common.value.arg) {
 151                 /* Append to existing argument list */
 152
 153                 prev_arg = op->common.value.arg;
 154                 while (prev_arg->common.next) {
 155                         prev_arg = prev_arg->common.next;
 156                 }
 157                 prev_arg->common.next = arg;
 158         } else {
 159                 /* No argument list, this will be the first argument */
 160
 161                 op->common.value.arg = arg;
 162         }
 163
 164         /* Set the parent in this arg and any args linked after it */
 165
 166         while (arg) {
 167                 arg->common.parent = op;
 168                 arg = arg->common.next;
 169         }
 170 }
 171
 172 #ifdef ACPI_FUTURE_USAGE
 173 /*******************************************************************************
 174  *
 175  * FUNCTION:    acpi_ps_get_depth_next
 176  *
 177  * PARAMETERS:  Origin          - Root of subtree to search
 178  *              Op              - Last (previous) Op that was found
 179  *
 180  * RETURN:      Next Op found in the search.
 181  *
 182  * DESCRIPTION: Get next op in tree (walking the tree in depth-first order)
 183  *              Return NULL when reaching "origin" or when walking up from root
 184  *
 185  ******************************************************************************/
 186
 187 union acpi_parse_object *acpi_ps_get_depth_next(union acpi_parse_object *origin,
 188                                                 union acpi_parse_object *op)
 189 {
 190         union acpi_parse_object *next = NULL;
 191         union acpi_parse_object *parent;
 192         union acpi_parse_object *arg;
 193
 194         ACPI_FUNCTION_ENTRY();
 195
 196         if (!op) {
 197                 return (NULL);
 198         }
 199
 200         /* Look for an argument or child */
 201
 202         next = acpi_ps_get_arg(op, 0);
 203         if (next) {
 204                 return (next);
 205         }
 206
 207         /* Look for a sibling */
 208
 209         next = op->common.next;
 210         if (next) {
 211                 return (next);
 212         }
 213
 214         /* Look for a sibling of parent */
 215
 216         parent = op->common.parent;
 217
 218         while (parent) {
 219                 arg = acpi_ps_get_arg(parent, 0);
 220                 while (arg && (arg != origin) && (arg != op)) {
 221                         arg = arg->common.next;
 222                 }
 223
 224                 if (arg == origin) {
 225                         /* Reached parent of origin, end search */
 226
 227                         return (NULL);
 228                 }
 229
 230                 if (parent->common.next) {
 231                         /* Found sibling of parent */
 232
 233                         return (parent->common.next);
 234                 }
 235
 236                 op = parent;
 237                 parent = parent->common.parent;
 238         }
 239
 240         return (next);
 241 }
 242
 243 #ifdef ACPI_OBSOLETE_FUNCTIONS
 244 /*******************************************************************************
 245  *
 246  * FUNCTION:    acpi_ps_get_child
 247  *
 248  * PARAMETERS:  Op              - Get the child of this Op
 249  *
 250  * RETURN:      Child Op, Null if none is found.
 251  *
 252  * DESCRIPTION: Get op's children or NULL if none
 253  *
 254  ******************************************************************************/
 255
 256 union acpi_parse_object *acpi_ps_get_child(union acpi_parse_object *op)
 257 {
 258         union acpi_parse_object *child = NULL;
 259
 260         ACPI_FUNCTION_ENTRY();
 261
 262         switch (op->common.aml_opcode) {
 263         case AML_SCOPE_OP:
 264         case AML_ELSE_OP:
 265         case AML_DEVICE_OP:
 266         case AML_THERMAL_ZONE_OP:
 267         case AML_INT_METHODCALL_OP:
 268
 269                 child = acpi_ps_get_arg(op, 0);
 270                 break;
 271
 272         case AML_BUFFER_OP:
 273         case AML_PACKAGE_OP:
 274         case AML_METHOD_OP:
 275         case AML_IF_OP:
 276         case AML_WHILE_OP:
 277         case AML_FIELD_OP:
 278
 279                 child = acpi_ps_get_arg(op, 1);
 280                 break;
 281
 282         case AML_POWER_RES_OP:
 283         case AML_INDEX_FIELD_OP:
 284
 285                 child = acpi_ps_get_arg(op, 2);
 286                 break;
 287
 288         case AML_PROCESSOR_OP:
 289         case AML_BANK_FIELD_OP:
 290
 291                 child = acpi_ps_get_arg(op, 3);
 292                 break;
 293
 294         default:
 295                 /* All others have no children */
 296                 break;
 297         }
 298
 299         return (child);
 300 }
 301 #endif
 302
 303 #endif                          /*  ACPI_FUTURE_USAGE  */