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 - 2017, 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_TRACE(ps_append_arg);
 133
 134         if (!op) {
 135                 return_VOID;
 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_VOID;
 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_VOID;
 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         return_VOID;
 186 }
 187
 188 /*******************************************************************************
 189  *
 190  * FUNCTION:    acpi_ps_get_depth_next
 191  *
 192  * PARAMETERS:  origin          - Root of subtree to search
 193  *              op              - Last (previous) Op that was found
 194  *
 195  * RETURN:      Next Op found in the search.
 196  *
 197  * DESCRIPTION: Get next op in tree (walking the tree in depth-first order)
 198  *              Return NULL when reaching "origin" or when walking up from root
 199  *
 200  ******************************************************************************/
 201
 202 union acpi_parse_object *acpi_ps_get_depth_next(union acpi_parse_object *origin,
 203                                                 union acpi_parse_object *op)
 204 {
 205         union acpi_parse_object *next = NULL;
 206         union acpi_parse_object *parent;
 207         union acpi_parse_object *arg;
 208
 209         ACPI_FUNCTION_ENTRY();
 210
 211         if (!op) {
 212                 return (NULL);
 213         }
 214
 215         /* Look for an argument or child */
 216
 217         next = acpi_ps_get_arg(op, 0);
 218         if (next) {
 219                 return (next);
 220         }
 221
 222         /* Look for a sibling */
 223
 224         next = op->common.next;
 225         if (next) {
 226                 return (next);
 227         }
 228
 229         /* Look for a sibling of parent */
 230
 231         parent = op->common.parent;
 232
 233         while (parent) {
 234                 arg = acpi_ps_get_arg(parent, 0);
 235                 while (arg && (arg != origin) && (arg != op)) {
 236                         arg = arg->common.next;
 237                 }
 238
 239                 if (arg == origin) {
 240
 241                         /* Reached parent of origin, end search */
 242
 243                         return (NULL);
 244                 }
 245
 246                 if (parent->common.next) {
 247
 248                         /* Found sibling of parent */
 249
 250                         return (parent->common.next);
 251                 }
 252
 253                 op = parent;
 254                 parent = parent->common.parent;
 255         }
 256
 257         return (next);
 258 }
 259
 260 #ifdef ACPI_OBSOLETE_FUNCTIONS
 261 /*******************************************************************************
 262  *
 263  * FUNCTION:    acpi_ps_get_child
 264  *
 265  * PARAMETERS:  op              - Get the child of this Op
 266  *
 267  * RETURN:      Child Op, Null if none is found.
 268  *
 269  * DESCRIPTION: Get op's children or NULL if none
 270  *
 271  ******************************************************************************/
 272
 273 union acpi_parse_object *acpi_ps_get_child(union acpi_parse_object *op)
 274 {
 275         union acpi_parse_object *child = NULL;
 276
 277         ACPI_FUNCTION_ENTRY();
 278
 279         switch (op->common.aml_opcode) {
 280         case AML_SCOPE_OP:
 281         case AML_ELSE_OP:
 282         case AML_DEVICE_OP:
 283         case AML_THERMAL_ZONE_OP:
 284         case AML_INT_METHODCALL_OP:
 285
 286                 child = acpi_ps_get_arg(op, 0);
 287                 break;
 288
 289         case AML_BUFFER_OP:
 290         case AML_PACKAGE_OP:
 291         case AML_METHOD_OP:
 292         case AML_IF_OP:
 293         case AML_WHILE_OP:
 294         case AML_FIELD_OP:
 295
 296                 child = acpi_ps_get_arg(op, 1);
 297                 break;
 298
 299         case AML_POWER_RES_OP:
 300         case AML_INDEX_FIELD_OP:
 301
 302                 child = acpi_ps_get_arg(op, 2);
 303                 break;
 304
 305         case AML_PROCESSOR_OP:
 306         case AML_BANK_FIELD_OP:
 307
 308                 child = acpi_ps_get_arg(op, 3);
 309                 break;
 310
 311         default:
 312
 313                 /* All others have no children */
 314
 315                 break;
 316         }
 317
 318         return (child);
 319 }
 320 #endif