drivers/acpi/parser/pstree.c

   1 /******************************************************************************
   2  *
   3  * Module Name: pstree - Parser op tree manipulation/traversal/search
   4  *
   5  *****************************************************************************/
   6
   7 /******************************************************************************
   8  *
   9  * 1. Copyright Notice
  10  *
  11  * Some or all of this work - Copyright (c) 1999 - 2010, Intel Corp.
  12  * All rights reserved.
  13  *
  14  * 2. License
  15  *
  16  * 2.1. This is your license from Intel Corp. under its intellectual property
  17  * rights.  You may have additional license terms from the party that provided
  18  * you this software, covering your right to use that party's intellectual
  19  * property rights.
  20  *
  21  * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
  22  * copy of the source code appearing in this file ("Covered Code") an
  23  * irrevocable, perpetual, worldwide license under Intel's copyrights in the
  24  * base code distributed originally by Intel ("Original Intel Code") to copy,
  25  * make derivatives, distribute, use and display any portion of the Covered
  26  * Code in any form, with the right to sublicense such rights; and
  27  *
  28  * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
  29  * license (with the right to sublicense), under only those claims of Intel
  30  * patents that are infringed by the Original Intel Code, to make, use, sell,
  31  * offer to sell, and import the Covered Code and derivative works thereof
  32  * solely to the minimum extent necessary to exercise the above copyright
  33  * license, and in no event shall the patent license extend to any additions
  34  * to or modifications of the Original Intel Code.  No other license or right
  35  * is granted directly or by implication, estoppel or otherwise;
  36  *
  37  * The above copyright and patent license is granted only if the following
  38  * conditions are met:
  39  *
  40  * 3. Conditions
  41  *
  42  * 3.1. Redistribution of Source with Rights to Further Distribute Source.
  43  * Redistribution of source code of any substantial portion of the Covered
  44  * Code or modification with rights to further distribute source must include
  45  * the above Copyright Notice, the above License, this list of Conditions,
  46  * and the following Disclaimer and Export Compliance provision.  In addition,
  47  * Licensee must cause all Covered Code to which Licensee contributes to
  48  * contain a file documenting the changes Licensee made to create that Covered
  49  * Code and the date of any change.  Licensee must include in that file the
  50  * documentation of any changes made by any predecessor Licensee.  Licensee
  51  * must include a prominent statement that the modification is derived,
  52  * directly or indirectly, from Original Intel Code.
  53  *
  54  * 3.2. Redistribution of Source with no Rights to Further Distribute Source.
  55  * Redistribution of source code of any substantial portion of the Covered
  56  * Code or modification without rights to further distribute source must
  57  * include the following Disclaimer and Export Compliance provision in the
  58  * documentation and/or other materials provided with distribution.  In
  59  * addition, Licensee may not authorize further sublicense of source of any
  60  * portion of the Covered Code, and must include terms to the effect that the
  61  * license from Licensee to its licensee is limited to the intellectual
  62  * property embodied in the software Licensee provides to its licensee, and
  63  * not to intellectual property embodied in modifications its licensee may
  64  * make.
  65  *
  66  * 3.3. Redistribution of Executable. Redistribution in executable form of any
  67  * substantial portion of the Covered Code or modification must reproduce the
  68  * above Copyright Notice, and the following Disclaimer and Export Compliance
  69  * provision in the documentation and/or other materials provided with the
  70  * distribution.
  71  *
  72  * 3.4. Intel retains all right, title, and interest in and to the Original
  73  * Intel Code.
  74  *
  75  * 3.5. Neither the name Intel nor any other trademark owned or controlled by
  76  * Intel shall be used in advertising or otherwise to promote the sale, use or
  77  * other dealings in products derived from or relating to the Covered Code
  78  * without prior written authorization from Intel.
  79  *
  80  * 4. Disclaimer and Export Compliance
  81  *
  82  * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
  83  * HERE.  ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
  84  * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT,  ASSISTANCE,
  85  * INSTALLATION, TRAINING OR OTHER SERVICES.  INTEL WILL NOT PROVIDE ANY
  86  * UPDATES, ENHANCEMENTS OR EXTENSIONS.  INTEL SPECIFICALLY DISCLAIMS ANY
  87  * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
  88  * PARTICULAR PURPOSE.
  89  *
  90  * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
  91  * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
  92  * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
  93  * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
  94  * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
  95  * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES.  THESE LIMITATIONS
  96  * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
  97  * LIMITED REMEDY.
  98  *
  99  * 4.3. Licensee shall not export, either directly or indirectly, any of this
 100  * software or system incorporating such software without first obtaining any
 101  * required license or other approval from the U. S. Department of Commerce or
 102  * any other agency or department of the United States Government.  In the
 103  * event Licensee exports any such software from the United States or
 104  * re-exports any such software from a foreign destination, Licensee shall
 105  * ensure that the distribution and export/re-export of the software is in
 106  * compliance with all laws, regulations, orders, or other restrictions of the
 107  * U.S. Export Administration Regulations. Licensee agrees that neither it nor
 108  * any of its subsidiaries will export/re-export any technical data, process,
 109  * software, or service, directly or indirectly, to any country for which the
 110  * United States government or any agency thereof requires an export license,
 111  * other governmental approval, or letter of assurance, without first obtaining
 112  * such license, approval or letter.
 113  *
 114  *****************************************************************************/
 115
 116
 117 #define __PSTREE_C__
 118
 119 #include "acpi.h"
 120 #include "accommon.h"
 121 #include "acparser.h"
 122 #include "amlcode.h"
 123
 124 #define _COMPONENT          ACPI_PARSER
 125         ACPI_MODULE_NAME    ("pstree")
 126
 127 /* Local prototypes */
 128
 129 #ifdef ACPI_OBSOLETE_FUNCTIONS
 130 ACPI_PARSE_OBJECT *
 131 AcpiPsGetChild (
 132     ACPI_PARSE_OBJECT       *op);
 133 #endif
 134
 135
 136 /*******************************************************************************
 137  *
 138  * FUNCTION:    AcpiPsGetArg
 139  *
 140  * PARAMETERS:  Op              - Get an argument for this op
 141  *              Argn            - Nth argument to get
 142  *
 143  * RETURN:      The argument (as an Op object). NULL if argument does not exist
 144  *
 145  * DESCRIPTION: Get the specified op's argument.
 146  *
 147  ******************************************************************************/
 148
 149 ACPI_PARSE_OBJECT *
 150 AcpiPsGetArg (
 151     ACPI_PARSE_OBJECT       *Op,
 152     UINT32                  Argn)
 153 {
 154     ACPI_PARSE_OBJECT       *Arg = NULL;
 155     const ACPI_OPCODE_INFO  *OpInfo;
 156
 157
 158     ACPI_FUNCTION_ENTRY ();
 159
 160
 161     /* Get the info structure for this opcode */
 162
 163     OpInfo = AcpiPsGetOpcodeInfo (Op->Common.AmlOpcode);
 164     if (OpInfo->Class == AML_CLASS_UNKNOWN)
 165     {
 166         /* Invalid opcode or ASCII character */
 167
 168         return (NULL);
 169     }
 170
 171     /* Check if this opcode requires argument sub-objects */
 172
 173     if (!(OpInfo->Flags & AML_HAS_ARGS))
 174     {
 175         /* Has no linked argument objects */
 176
 177         return (NULL);
 178     }
 179
 180     /* Get the requested argument object */
 181
 182     Arg = Op->Common.Value.Arg;
 183     while (Arg && Argn)
 184     {
 185         Argn--;
 186         Arg = Arg->Common.Next;
 187     }
 188
 189     return (Arg);
 190 }
 191
 192
 193 /*******************************************************************************
 194  *
 195  * FUNCTION:    AcpiPsAppendArg
 196  *
 197  * PARAMETERS:  Op              - Append an argument to this Op.
 198  *              Arg             - Argument Op to append
 199  *
 200  * RETURN:      None.
 201  *
 202  * DESCRIPTION: Append an argument to an op's argument list (a NULL arg is OK)
 203  *
 204  ******************************************************************************/
 205
 206 void
 207 AcpiPsAppendArg (
 208     ACPI_PARSE_OBJECT       *Op,
 209     ACPI_PARSE_OBJECT       *Arg)
 210 {
 211     ACPI_PARSE_OBJECT       *PrevArg;
 212     const ACPI_OPCODE_INFO  *OpInfo;
 213
 214
 215     ACPI_FUNCTION_ENTRY ();
 216
 217
 218     if (!Op)
 219     {
 220         return;
 221     }
 222
 223     /* Get the info structure for this opcode */
 224
 225     OpInfo = AcpiPsGetOpcodeInfo (Op->Common.AmlOpcode);
 226     if (OpInfo->Class == AML_CLASS_UNKNOWN)
 227     {
 228         /* Invalid opcode */
 229
 230         ACPI_ERROR ((AE_INFO, "Invalid AML Opcode: 0x%2.2X",
 231             Op->Common.AmlOpcode));
 232         return;
 233     }
 234
 235     /* Check if this opcode requires argument sub-objects */
 236
 237     if (!(OpInfo->Flags & AML_HAS_ARGS))
 238     {
 239         /* Has no linked argument objects */
 240
 241         return;
 242     }
 243
 244     /* Append the argument to the linked argument list */
 245
 246     if (Op->Common.Value.Arg)
 247     {
 248         /* Append to existing argument list */
 249
 250         PrevArg = Op->Common.Value.Arg;
 251         while (PrevArg->Common.Next)
 252         {
 253             PrevArg = PrevArg->Common.Next;
 254         }
 255         PrevArg->Common.Next = Arg;
 256     }
 257     else
 258     {
 259         /* No argument list, this will be the first argument */
 260
 261         Op->Common.Value.Arg = Arg;
 262     }
 263
 264     /* Set the parent in this arg and any args linked after it */
 265
 266     while (Arg)
 267     {
 268         Arg->Common.Parent = Op;
 269         Arg = Arg->Common.Next;
 270
 271         Op->Common.ArgListLength++;
 272     }
 273 }
 274
 275
 276 /*******************************************************************************
 277  *
 278  * FUNCTION:    AcpiPsGetDepthNext
 279  *
 280  * PARAMETERS:  Origin          - Root of subtree to search
 281  *              Op              - Last (previous) Op that was found
 282  *
 283  * RETURN:      Next Op found in the search.
 284  *
 285  * DESCRIPTION: Get next op in tree (walking the tree in depth-first order)
 286  *              Return NULL when reaching "origin" or when walking up from root
 287  *
 288  ******************************************************************************/
 289
 290 ACPI_PARSE_OBJECT *
 291 AcpiPsGetDepthNext (
 292     ACPI_PARSE_OBJECT       *Origin,
 293     ACPI_PARSE_OBJECT       *Op)
 294 {
 295     ACPI_PARSE_OBJECT       *Next = NULL;
 296     ACPI_PARSE_OBJECT       *Parent;
 297     ACPI_PARSE_OBJECT       *Arg;
 298
 299
 300     ACPI_FUNCTION_ENTRY ();
 301
 302
 303     if (!Op)
 304     {
 305         return (NULL);
 306     }
 307
 308     /* Look for an argument or child */
 309
 310     Next = AcpiPsGetArg (Op, 0);
 311     if (Next)
 312     {
 313         return (Next);
 314     }
 315
 316     /* Look for a sibling */
 317
 318     Next = Op->Common.Next;
 319     if (Next)
 320     {
 321         return (Next);
 322     }
 323
 324     /* Look for a sibling of parent */
 325
 326     Parent = Op->Common.Parent;
 327
 328     while (Parent)
 329     {
 330         Arg = AcpiPsGetArg (Parent, 0);
 331         while (Arg && (Arg != Origin) && (Arg != Op))
 332         {
 333             Arg = Arg->Common.Next;
 334         }
 335
 336         if (Arg == Origin)
 337         {
 338             /* Reached parent of origin, end search */
 339
 340             return (NULL);
 341         }
 342
 343         if (Parent->Common.Next)
 344         {
 345             /* Found sibling of parent */
 346
 347             return (Parent->Common.Next);
 348         }
 349
 350         Op = Parent;
 351         Parent = Parent->Common.Parent;
 352     }
 353
 354     return (Next);
 355 }
 356
 357
 358 #ifdef ACPI_OBSOLETE_FUNCTIONS
 359 /*******************************************************************************
 360  *
 361  * FUNCTION:    AcpiPsGetChild
 362  *
 363  * PARAMETERS:  Op              - Get the child of this Op
 364  *
 365  * RETURN:      Child Op, Null if none is found.
 366  *
 367  * DESCRIPTION: Get op's children or NULL if none
 368  *
 369  ******************************************************************************/
 370
 371 ACPI_PARSE_OBJECT *
 372 AcpiPsGetChild (
 373     ACPI_PARSE_OBJECT       *Op)
 374 {
 375     ACPI_PARSE_OBJECT       *Child = NULL;
 376
 377
 378     ACPI_FUNCTION_ENTRY ();
 379
 380
 381     switch (Op->Common.AmlOpcode)
 382     {
 383     case AML_SCOPE_OP:
 384     case AML_ELSE_OP:
 385     case AML_DEVICE_OP:
 386     case AML_THERMAL_ZONE_OP:
 387     case AML_INT_METHODCALL_OP:
 388
 389         Child = AcpiPsGetArg (Op, 0);
 390         break;
 391
 392
 393     case AML_BUFFER_OP:
 394     case AML_PACKAGE_OP:
 395     case AML_METHOD_OP:
 396     case AML_IF_OP:
 397     case AML_WHILE_OP:
 398     case AML_FIELD_OP:
 399
 400         Child = AcpiPsGetArg (Op, 1);
 401         break;
 402
 403
 404     case AML_POWER_RES_OP:
 405     case AML_INDEX_FIELD_OP:
 406
 407         Child = AcpiPsGetArg (Op, 2);
 408         break;
 409
 410
 411     case AML_PROCESSOR_OP:
 412     case AML_BANK_FIELD_OP:
 413
 414         Child = AcpiPsGetArg (Op, 3);
 415         break;
 416
 417
 418     default:
 419         /* All others have no children */
 420         break;
 421     }
 422
 423     return (Child);
 424 }
 425 #endif
 426
 427