drivers/bus/acpi/acpica/parser/psutils.c

   1 /******************************************************************************
   2  *
   3  * Module Name: psutils - Parser miscellaneous utilities (Parser only)
   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.h"
  45 #include "accommon.h"
  46 #include "acparser.h"
  47 #include "amlcode.h"
  48 #include "acconvert.h"
  49
  50 #define _COMPONENT          ACPI_PARSER
  51         ACPI_MODULE_NAME    ("psutils")
  52
  53
  54 /*******************************************************************************
  55  *
  56  * FUNCTION:    AcpiPsCreateScopeOp
  57  *
  58  * PARAMETERS:  None
  59  *
  60  * RETURN:      A new Scope object, null on failure
  61  *
  62  * DESCRIPTION: Create a Scope and associated namepath op with the root name
  63  *
  64  ******************************************************************************/
  65
  66 ACPI_PARSE_OBJECT *
  67 AcpiPsCreateScopeOp (
  68     UINT8                   *Aml)
  69 {
  70     ACPI_PARSE_OBJECT       *ScopeOp;
  71
  72
  73     ScopeOp = AcpiPsAllocOp (AML_SCOPE_OP, Aml);
  74     if (!ScopeOp)
  75     {
  76         return (NULL);
  77     }
  78
  79     ScopeOp->Named.Name = ACPI_ROOT_NAME;
  80     return (ScopeOp);
  81 }
  82
  83
  84 /*******************************************************************************
  85  *
  86  * FUNCTION:    AcpiPsInitOp
  87  *
  88  * PARAMETERS:  Op              - A newly allocated Op object
  89  *              Opcode          - Opcode to store in the Op
  90  *
  91  * RETURN:      None
  92  *
  93  * DESCRIPTION: Initialize a parse (Op) object
  94  *
  95  ******************************************************************************/
  96
  97 void
  98 AcpiPsInitOp (
  99     ACPI_PARSE_OBJECT       *Op,
 100     UINT16                  Opcode)
 101 {
 102     ACPI_FUNCTION_ENTRY ();
 103
 104
 105     Op->Common.DescriptorType = ACPI_DESC_TYPE_PARSER;
 106     Op->Common.AmlOpcode = Opcode;
 107
 108     ACPI_DISASM_ONLY_MEMBERS (AcpiUtSafeStrncpy (Op->Common.AmlOpName,
 109         (AcpiPsGetOpcodeInfo (Opcode))->Name,
 110         sizeof (Op->Common.AmlOpName)));
 111 }
 112
 113
 114 /*******************************************************************************
 115  *
 116  * FUNCTION:    AcpiPsAllocOp
 117  *
 118  * PARAMETERS:  Opcode          - Opcode that will be stored in the new Op
 119  *              Aml             - Address of the opcode
 120  *
 121  * RETURN:      Pointer to the new Op, null on failure
 122  *
 123  * DESCRIPTION: Allocate an acpi_op, choose op type (and thus size) based on
 124  *              opcode. A cache of opcodes is available for the pure
 125  *              GENERIC_OP, since this is by far the most commonly used.
 126  *
 127  ******************************************************************************/
 128
 129 ACPI_PARSE_OBJECT*
 130 AcpiPsAllocOp (
 131     UINT16                  Opcode,
 132     UINT8                   *Aml)
 133 {
 134     ACPI_PARSE_OBJECT       *Op;
 135     const ACPI_OPCODE_INFO  *OpInfo;
 136     UINT8                   Flags = ACPI_PARSEOP_GENERIC;
 137
 138
 139     ACPI_FUNCTION_ENTRY ();
 140
 141
 142     OpInfo = AcpiPsGetOpcodeInfo (Opcode);
 143
 144     /* Determine type of ParseOp required */
 145
 146     if (OpInfo->Flags & AML_DEFER)
 147     {
 148         Flags = ACPI_PARSEOP_DEFERRED;
 149     }
 150     else if (OpInfo->Flags & AML_NAMED)
 151     {
 152         Flags = ACPI_PARSEOP_NAMED_OBJECT;
 153     }
 154     else if (Opcode == AML_INT_BYTELIST_OP)
 155     {
 156         Flags = ACPI_PARSEOP_BYTELIST;
 157     }
 158
 159     /* Allocate the minimum required size object */
 160
 161     if (Flags == ACPI_PARSEOP_GENERIC)
 162     {
 163         /* The generic op (default) is by far the most common (16 to 1) */
 164
 165         Op = AcpiOsAcquireObject (AcpiGbl_PsNodeCache);
 166     }
 167     else
 168     {
 169         /* Extended parseop */
 170
 171         Op = AcpiOsAcquireObject (AcpiGbl_PsNodeExtCache);
 172     }
 173
 174     /* Initialize the Op */
 175
 176     if (Op)
 177     {
 178         AcpiPsInitOp (Op, Opcode);
 179         Op->Common.Aml = Aml;
 180         Op->Common.Flags = Flags;
 181         ASL_CV_CLEAR_OP_COMMENTS(Op);
 182
 183         if (Opcode == AML_SCOPE_OP)
 184         {
 185             AcpiGbl_CurrentScope = Op;
 186         }
 187
 188         if (AcpiGbl_CaptureComments)
 189         {
 190             ASL_CV_TRANSFER_COMMENTS (Op);
 191         }
 192     }
 193
 194     return (Op);
 195 }
 196
 197
 198 /*******************************************************************************
 199  *
 200  * FUNCTION:    AcpiPsFreeOp
 201  *
 202  * PARAMETERS:  Op              - Op to be freed
 203  *
 204  * RETURN:      None.
 205  *
 206  * DESCRIPTION: Free an Op object. Either put it on the GENERIC_OP cache list
 207  *              or actually free it.
 208  *
 209  ******************************************************************************/
 210
 211 void
 212 AcpiPsFreeOp (
 213     ACPI_PARSE_OBJECT       *Op)
 214 {
 215     ACPI_FUNCTION_NAME (PsFreeOp);
 216
 217
 218     ASL_CV_CLEAR_OP_COMMENTS(Op);
 219     if (Op->Common.AmlOpcode == AML_INT_RETURN_VALUE_OP)
 220     {
 221         ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS,
 222             "Free retval op: %p\n", Op));
 223     }
 224
 225     if (Op->Common.Flags & ACPI_PARSEOP_GENERIC)
 226     {
 227         (void) AcpiOsReleaseObject (AcpiGbl_PsNodeCache, Op);
 228     }
 229     else
 230     {
 231         (void) AcpiOsReleaseObject (AcpiGbl_PsNodeExtCache, Op);
 232     }
 233 }
 234
 235
 236 /*******************************************************************************
 237  *
 238  * FUNCTION:    Utility functions
 239  *
 240  * DESCRIPTION: Low level character and object functions
 241  *
 242  ******************************************************************************/
 243
 244
 245 /*
 246  * Is "c" a namestring lead character?
 247  */
 248 BOOLEAN
 249 AcpiPsIsLeadingChar (
 250     UINT32                  c)
 251 {
 252     return ((BOOLEAN) (c == '_' || (c >= 'A' && c <= 'Z')));
 253 }
 254
 255
 256 /*
 257  * Get op's name (4-byte name segment) or 0 if unnamed
 258  */
 259 UINT32
 260 AcpiPsGetName (
 261     ACPI_PARSE_OBJECT       *Op)
 262 {
 263
 264     /* The "generic" object has no name associated with it */
 265
 266     if (Op->Common.Flags & ACPI_PARSEOP_GENERIC)
 267     {
 268         return (0);
 269     }
 270
 271     /* Only the "Extended" parse objects have a name */
 272
 273     return (Op->Named.Name);
 274 }
 275
 276
 277 /*
 278  * Set op's name
 279  */
 280 void
 281 AcpiPsSetName (
 282     ACPI_PARSE_OBJECT       *Op,
 283     UINT32                  name)
 284 {
 285
 286     /* The "generic" object has no name associated with it */
 287
 288     if (Op->Common.Flags & ACPI_PARSEOP_GENERIC)
 289     {
 290         return;
 291     }
 292
 293     Op->Named.Name = name;
 294 }