drivers/acpi/parser/psscope.c

   1 /******************************************************************************
   2  *
   3  * Module Name: psscope - Parser scope stack management routines
   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 #include "acpi.h"
 118 #include "accommon.h"
 119 #include "acparser.h"
 120
 121 #define _COMPONENT          ACPI_PARSER
 122         ACPI_MODULE_NAME    ("psscope")
 123
 124
 125 /*******************************************************************************
 126  *
 127  * FUNCTION:    AcpiPsGetParentScope
 128  *
 129  * PARAMETERS:  ParserState         - Current parser state object
 130  *
 131  * RETURN:      Pointer to an Op object
 132  *
 133  * DESCRIPTION: Get parent of current op being parsed
 134  *
 135  ******************************************************************************/
 136
 137 ACPI_PARSE_OBJECT *
 138 AcpiPsGetParentScope (
 139     ACPI_PARSE_STATE        *ParserState)
 140 {
 141
 142     return (ParserState->Scope->ParseScope.Op);
 143 }
 144
 145
 146 /*******************************************************************************
 147  *
 148  * FUNCTION:    AcpiPsHasCompletedScope
 149  *
 150  * PARAMETERS:  ParserState         - Current parser state object
 151  *
 152  * RETURN:      Boolean, TRUE = scope completed.
 153  *
 154  * DESCRIPTION: Is parsing of current argument complete?  Determined by
 155  *              1) AML pointer is at or beyond the end of the scope
 156  *              2) The scope argument count has reached zero.
 157  *
 158  ******************************************************************************/
 159
 160 BOOLEAN
 161 AcpiPsHasCompletedScope (
 162     ACPI_PARSE_STATE        *ParserState)
 163 {
 164
 165     return ((BOOLEAN)
 166             ((ParserState->Aml >= ParserState->Scope->ParseScope.ArgEnd ||
 167              !ParserState->Scope->ParseScope.ArgCount)));
 168 }
 169
 170
 171 /*******************************************************************************
 172  *
 173  * FUNCTION:    AcpiPsInitScope
 174  *
 175  * PARAMETERS:  ParserState         - Current parser state object
 176  *              Root                - the Root Node of this new scope
 177  *
 178  * RETURN:      Status
 179  *
 180  * DESCRIPTION: Allocate and init a new scope object
 181  *
 182  ******************************************************************************/
 183
 184 ACPI_STATUS
 185 AcpiPsInitScope (
 186     ACPI_PARSE_STATE        *ParserState,
 187     ACPI_PARSE_OBJECT       *RootOp)
 188 {
 189     ACPI_GENERIC_STATE      *Scope;
 190
 191
 192     ACPI_FUNCTION_TRACE_PTR (PsInitScope, RootOp);
 193
 194
 195     Scope = AcpiUtCreateGenericState ();
 196     if (!Scope)
 197     {
 198         return_ACPI_STATUS (AE_NO_MEMORY);
 199     }
 200
 201     Scope->Common.DescriptorType = ACPI_DESC_TYPE_STATE_RPSCOPE;
 202     Scope->ParseScope.Op = RootOp;
 203     Scope->ParseScope.ArgCount = ACPI_VAR_ARGS;
 204     Scope->ParseScope.ArgEnd = ParserState->AmlEnd;
 205     Scope->ParseScope.PkgEnd = ParserState->AmlEnd;
 206
 207     ParserState->Scope = Scope;
 208     ParserState->StartOp = RootOp;
 209
 210     return_ACPI_STATUS (AE_OK);
 211 }
 212
 213
 214 /*******************************************************************************
 215  *
 216  * FUNCTION:    AcpiPsPushScope
 217  *
 218  * PARAMETERS:  ParserState         - Current parser state object
 219  *              Op                  - Current op to be pushed
 220  *              RemainingArgs       - List of args remaining
 221  *              ArgCount            - Fixed or variable number of args
 222  *
 223  * RETURN:      Status
 224  *
 225  * DESCRIPTION: Push current op to begin parsing its argument
 226  *
 227  ******************************************************************************/
 228
 229 ACPI_STATUS
 230 AcpiPsPushScope (
 231     ACPI_PARSE_STATE        *ParserState,
 232     ACPI_PARSE_OBJECT       *Op,
 233     UINT32                  RemainingArgs,
 234     UINT32                  ArgCount)
 235 {
 236     ACPI_GENERIC_STATE      *Scope;
 237
 238
 239     ACPI_FUNCTION_TRACE_PTR (PsPushScope, Op);
 240
 241
 242     Scope = AcpiUtCreateGenericState ();
 243     if (!Scope)
 244     {
 245         return_ACPI_STATUS (AE_NO_MEMORY);
 246     }
 247
 248     Scope->Common.DescriptorType = ACPI_DESC_TYPE_STATE_PSCOPE;
 249     Scope->ParseScope.Op = Op;
 250     Scope->ParseScope.ArgList = RemainingArgs;
 251     Scope->ParseScope.ArgCount = ArgCount;
 252     Scope->ParseScope.PkgEnd = ParserState->PkgEnd;
 253
 254     /* Push onto scope stack */
 255
 256     AcpiUtPushGenericState (&ParserState->Scope, Scope);
 257
 258     if (ArgCount == ACPI_VAR_ARGS)
 259     {
 260         /* Multiple arguments */
 261
 262         Scope->ParseScope.ArgEnd = ParserState->PkgEnd;
 263     }
 264     else
 265     {
 266         /* Single argument */
 267
 268         Scope->ParseScope.ArgEnd = ACPI_TO_POINTER (ACPI_MAX_PTR);
 269     }
 270
 271     return_ACPI_STATUS (AE_OK);
 272 }
 273
 274
 275 /*******************************************************************************
 276  *
 277  * FUNCTION:    AcpiPsPopScope
 278  *
 279  * PARAMETERS:  ParserState         - Current parser state object
 280  *              Op                  - Where the popped op is returned
 281  *              ArgList             - Where the popped "next argument" is
 282  *                                    returned
 283  *              ArgCount            - Count of objects in ArgList
 284  *
 285  * RETURN:      Status
 286  *
 287  * DESCRIPTION: Return to parsing a previous op
 288  *
 289  ******************************************************************************/
 290
 291 void
 292 AcpiPsPopScope (
 293     ACPI_PARSE_STATE        *ParserState,
 294     ACPI_PARSE_OBJECT       **Op,
 295     UINT32                  *ArgList,
 296     UINT32                  *ArgCount)
 297 {
 298     ACPI_GENERIC_STATE      *Scope = ParserState->Scope;
 299
 300
 301     ACPI_FUNCTION_TRACE (PsPopScope);
 302
 303
 304     /* Only pop the scope if there is in fact a next scope */
 305
 306     if (Scope->Common.Next)
 307     {
 308         Scope = AcpiUtPopGenericState (&ParserState->Scope);
 309
 310         /* Return to parsing previous op */
 311
 312         *Op                 = Scope->ParseScope.Op;
 313         *ArgList            = Scope->ParseScope.ArgList;
 314         *ArgCount           = Scope->ParseScope.ArgCount;
 315         ParserState->PkgEnd = Scope->ParseScope.PkgEnd;
 316
 317         /* All done with this scope state structure */
 318
 319         AcpiUtDeleteGenericState (Scope);
 320     }
 321     else
 322     {
 323         /* Empty parse stack, prepare to fetch next opcode */
 324
 325         *Op       = NULL;
 326         *ArgList  = 0;
 327         *ArgCount = 0;
 328     }
 329
 330     ACPI_DEBUG_PRINT ((ACPI_DB_PARSE,
 331         "Popped Op %p Args %X\n", *Op, *ArgCount));
 332     return_VOID;
 333 }
 334
 335
 336 /*******************************************************************************
 337  *
 338  * FUNCTION:    AcpiPsCleanupScope
 339  *
 340  * PARAMETERS:  ParserState         - Current parser state object
 341  *
 342  * RETURN:      None
 343  *
 344  * DESCRIPTION: Destroy available list, remaining stack levels, and return
 345  *              root scope
 346  *
 347  ******************************************************************************/
 348
 349 void
 350 AcpiPsCleanupScope (
 351     ACPI_PARSE_STATE        *ParserState)
 352 {
 353     ACPI_GENERIC_STATE      *Scope;
 354
 355
 356     ACPI_FUNCTION_TRACE_PTR (PsCleanupScope, ParserState);
 357
 358
 359     if (!ParserState)
 360     {
 361         return_VOID;
 362     }
 363
 364     /* Delete anything on the scope stack */
 365
 366     while (ParserState->Scope)
 367     {
 368         Scope = AcpiUtPopGenericState (&ParserState->Scope);
 369         AcpiUtDeleteGenericState (Scope);
 370     }
 371
 372     return_VOID;
 373 }
 374