drivers/acpi/parser/psutils.c

   1 /******************************************************************************
   2  *
   3  * Module Name: psutils - Parser miscellaneous utilities (Parser only)
   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 #include "amlcode.h"
 121
 122 #define _COMPONENT          ACPI_PARSER
 123         ACPI_MODULE_NAME    ("psutils")
 124
 125
 126 /*******************************************************************************
 127  *
 128  * FUNCTION:    AcpiPsCreateScopeOp
 129  *
 130  * PARAMETERS:  None
 131  *
 132  * RETURN:      A new Scope object, null on failure
 133  *
 134  * DESCRIPTION: Create a Scope and associated namepath op with the root name
 135  *
 136  ******************************************************************************/
 137
 138 ACPI_PARSE_OBJECT *
 139 AcpiPsCreateScopeOp (
 140     void)
 141 {
 142     ACPI_PARSE_OBJECT       *ScopeOp;
 143
 144
 145     ScopeOp = AcpiPsAllocOp (AML_SCOPE_OP);
 146     if (!ScopeOp)
 147     {
 148         return (NULL);
 149     }
 150
 151     ScopeOp->Named.Name = ACPI_ROOT_NAME;
 152     return (ScopeOp);
 153 }
 154
 155
 156 /*******************************************************************************
 157  *
 158  * FUNCTION:    AcpiPsInitOp
 159  *
 160  * PARAMETERS:  Op              - A newly allocated Op object
 161  *              Opcode          - Opcode to store in the Op
 162  *
 163  * RETURN:      None
 164  *
 165  * DESCRIPTION: Initialize a parse (Op) object
 166  *
 167  ******************************************************************************/
 168
 169 void
 170 AcpiPsInitOp (
 171     ACPI_PARSE_OBJECT       *Op,
 172     UINT16                  Opcode)
 173 {
 174     ACPI_FUNCTION_ENTRY ();
 175
 176
 177     Op->Common.DescriptorType = ACPI_DESC_TYPE_PARSER;
 178     Op->Common.AmlOpcode = Opcode;
 179
 180     ACPI_DISASM_ONLY_MEMBERS (ACPI_STRNCPY (Op->Common.AmlOpName,
 181             (AcpiPsGetOpcodeInfo (Opcode))->Name,
 182                 sizeof (Op->Common.AmlOpName)));
 183 }
 184
 185
 186 /*******************************************************************************
 187  *
 188  * FUNCTION:    AcpiPsAllocOp
 189  *
 190  * PARAMETERS:  Opcode          - Opcode that will be stored in the new Op
 191  *
 192  * RETURN:      Pointer to the new Op, null on failure
 193  *
 194  * DESCRIPTION: Allocate an acpi_op, choose op type (and thus size) based on
 195  *              opcode.  A cache of opcodes is available for the pure
 196  *              GENERIC_OP, since this is by far the most commonly used.
 197  *
 198  ******************************************************************************/
 199
 200 ACPI_PARSE_OBJECT*
 201 AcpiPsAllocOp (
 202     UINT16                  Opcode)
 203 {
 204     ACPI_PARSE_OBJECT       *Op;
 205     const ACPI_OPCODE_INFO  *OpInfo;
 206     UINT8                   Flags = ACPI_PARSEOP_GENERIC;
 207
 208
 209     ACPI_FUNCTION_ENTRY ();
 210
 211
 212     OpInfo = AcpiPsGetOpcodeInfo (Opcode);
 213
 214     /* Determine type of ParseOp required */
 215
 216     if (OpInfo->Flags & AML_DEFER)
 217     {
 218         Flags = ACPI_PARSEOP_DEFERRED;
 219     }
 220     else if (OpInfo->Flags & AML_NAMED)
 221     {
 222         Flags = ACPI_PARSEOP_NAMED;
 223     }
 224     else if (Opcode == AML_INT_BYTELIST_OP)
 225     {
 226         Flags = ACPI_PARSEOP_BYTELIST;
 227     }
 228
 229     /* Allocate the minimum required size object */
 230
 231     if (Flags == ACPI_PARSEOP_GENERIC)
 232     {
 233         /* The generic op (default) is by far the most common (16 to 1) */
 234
 235         Op = AcpiOsAcquireObject (AcpiGbl_PsNodeCache);
 236     }
 237     else
 238     {
 239         /* Extended parseop */
 240
 241         Op = AcpiOsAcquireObject (AcpiGbl_PsNodeExtCache);
 242     }
 243
 244     /* Initialize the Op */
 245
 246     if (Op)
 247     {
 248         AcpiPsInitOp (Op, Opcode);
 249         Op->Common.Flags = Flags;
 250     }
 251
 252     return (Op);
 253 }
 254
 255
 256 /*******************************************************************************
 257  *
 258  * FUNCTION:    AcpiPsFreeOp
 259  *
 260  * PARAMETERS:  Op              - Op to be freed
 261  *
 262  * RETURN:      None.
 263  *
 264  * DESCRIPTION: Free an Op object.  Either put it on the GENERIC_OP cache list
 265  *              or actually free it.
 266  *
 267  ******************************************************************************/
 268
 269 void
 270 AcpiPsFreeOp (
 271     ACPI_PARSE_OBJECT       *Op)
 272 {
 273     ACPI_FUNCTION_NAME (PsFreeOp);
 274
 275
 276     if (Op->Common.AmlOpcode == AML_INT_RETURN_VALUE_OP)
 277     {
 278         ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS, "Free retval op: %p\n", Op));
 279     }
 280
 281     if (Op->Common.Flags & ACPI_PARSEOP_GENERIC)
 282     {
 283         (void) AcpiOsReleaseObject (AcpiGbl_PsNodeCache, Op);
 284     }
 285     else
 286     {
 287         (void) AcpiOsReleaseObject (AcpiGbl_PsNodeExtCache, Op);
 288     }
 289 }
 290
 291
 292 /*******************************************************************************
 293  *
 294  * FUNCTION:    Utility functions
 295  *
 296  * DESCRIPTION: Low level character and object functions
 297  *
 298  ******************************************************************************/
 299
 300
 301 /*
 302  * Is "c" a namestring lead character?
 303  */
 304 BOOLEAN
 305 AcpiPsIsLeadingChar (
 306     UINT32                  c)
 307 {
 308     return ((BOOLEAN) (c == '_' || (c >= 'A' && c <= 'Z')));
 309 }
 310
 311
 312 /*
 313  * Is "c" a namestring prefix character?
 314  */
 315 BOOLEAN
 316 AcpiPsIsPrefixChar (
 317     UINT32                  c)
 318 {
 319     return ((BOOLEAN) (c == '\\' || c == '^'));
 320 }
 321
 322
 323 /*
 324  * Get op's name (4-byte name segment) or 0 if unnamed
 325  */
 326 UINT32
 327 AcpiPsGetName (
 328     ACPI_PARSE_OBJECT       *Op)
 329 {
 330
 331     /* The "generic" object has no name associated with it */
 332
 333     if (Op->Common.Flags & ACPI_PARSEOP_GENERIC)
 334     {
 335         return (0);
 336     }
 337
 338     /* Only the "Extended" parse objects have a name */
 339
 340     return (Op->Named.Name);
 341 }
 342
 343
 344 /*
 345  * Set op's name
 346  */
 347 void
 348 AcpiPsSetName (
 349     ACPI_PARSE_OBJECT       *Op,
 350     UINT32                  name)
 351 {
 352
 353     /* The "generic" object has no name associated with it */
 354
 355     if (Op->Common.Flags & ACPI_PARSEOP_GENERIC)
 356     {
 357         return;
 358     }
 359
 360     Op->Named.Name = name;
 361 }
 362