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