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