1 /******************************************************************************
   2  *
   3  * Module Name: psutils - Parser miscellaneous utilities (Parser only)
   4  *
   5  *****************************************************************************/
   6 
   7 /*
   8  * Copyright (C) 2000 - 2014, 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 
  45 #include "acpi.h"
  46 #include "accommon.h"
  47 #include "acparser.h"
  48 #include "amlcode.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     void)
  69 {
  70     ACPI_PARSE_OBJECT       *ScopeOp;
  71 
  72 
  73     ScopeOp = AcpiPsAllocOp (AML_SCOPE_OP);
  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 (ACPI_STRNCPY (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  *
 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 {
 132     ACPI_PARSE_OBJECT       *Op;
 133     const ACPI_OPCODE_INFO  *OpInfo;
 134     UINT8                   Flags = ACPI_PARSEOP_GENERIC;
 135 
 136 
 137     ACPI_FUNCTION_ENTRY ();
 138 
 139 
 140     OpInfo = AcpiPsGetOpcodeInfo (Opcode);
 141 
 142     /* Determine type of ParseOp required */
 143 
 144     if (OpInfo->Flags & AML_DEFER)
 145     {
 146         Flags = ACPI_PARSEOP_DEFERRED;
 147     }
 148     else if (OpInfo->Flags & AML_NAMED)
 149     {
 150         Flags = ACPI_PARSEOP_NAMED;
 151     }
 152     else if (Opcode == AML_INT_BYTELIST_OP)
 153     {
 154         Flags = ACPI_PARSEOP_BYTELIST;
 155     }
 156 
 157     /* Allocate the minimum required size object */
 158 
 159     if (Flags == ACPI_PARSEOP_GENERIC)
 160     {
 161         /* The generic op (default) is by far the most common (16 to 1) */
 162 
 163         Op = AcpiOsAcquireObject (AcpiGbl_PsNodeCache);
 164     }
 165     else
 166     {
 167         /* Extended parseop */
 168 
 169         Op = AcpiOsAcquireObject (AcpiGbl_PsNodeExtCache);
 170     }
 171 
 172     /* Initialize the Op */
 173 
 174     if (Op)
 175     {
 176         AcpiPsInitOp (Op, Opcode);
 177         Op->Common.Flags = Flags;
 178     }
 179 
 180     return (Op);
 181 }
 182 
 183 
 184 /*******************************************************************************
 185  *
 186  * FUNCTION:    AcpiPsFreeOp
 187  *
 188  * PARAMETERS:  Op              - Op to be freed
 189  *
 190  * RETURN:      None.
 191  *
 192  * DESCRIPTION: Free an Op object. Either put it on the GENERIC_OP cache list
 193  *              or actually free it.
 194  *
 195  ******************************************************************************/
 196 
 197 void
 198 AcpiPsFreeOp (
 199     ACPI_PARSE_OBJECT       *Op)
 200 {
 201     ACPI_FUNCTION_NAME (PsFreeOp);
 202 
 203 
 204     if (Op->Common.AmlOpcode == AML_INT_RETURN_VALUE_OP)
 205     {
 206         ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS, "Free retval op: %p\n", Op));
 207     }
 208 
 209     if (Op->Common.Flags & ACPI_PARSEOP_GENERIC)
 210     {
 211         (void) AcpiOsReleaseObject (AcpiGbl_PsNodeCache, Op);
 212     }
 213     else
 214     {
 215         (void) AcpiOsReleaseObject (AcpiGbl_PsNodeExtCache, Op);
 216     }
 217 }
 218 
 219 
 220 /*******************************************************************************
 221  *
 222  * FUNCTION:    Utility functions
 223  *
 224  * DESCRIPTION: Low level character and object functions
 225  *
 226  ******************************************************************************/
 227 
 228 
 229 /*
 230  * Is "c" a namestring lead character?
 231  */
 232 BOOLEAN
 233 AcpiPsIsLeadingChar (
 234     UINT32                  c)
 235 {
 236     return ((BOOLEAN) (c == '_' || (c >= 'A' && c <= 'Z')));
 237 }
 238 
 239 
 240 /*
 241  * Get op's name (4-byte name segment) or 0 if unnamed
 242  */
 243 UINT32
 244 AcpiPsGetName (
 245     ACPI_PARSE_OBJECT       *Op)
 246 {
 247 
 248     /* The "generic" object has no name associated with it */
 249 
 250     if (Op->Common.Flags & ACPI_PARSEOP_GENERIC)
 251     {
 252         return (0);
 253     }
 254 
 255     /* Only the "Extended" parse objects have a name */
 256 
 257     return (Op->Named.Name);
 258 }
 259 
 260 
 261 /*
 262  * Set op's name
 263  */
 264 void
 265 AcpiPsSetName (
 266     ACPI_PARSE_OBJECT       *Op,
 267     UINT32                  name)
 268 {
 269 
 270     /* The "generic" object has no name associated with it */
 271 
 272     if (Op->Common.Flags & ACPI_PARSEOP_GENERIC)
 273     {
 274         return;
 275     }
 276 
 277     Op->Named.Name = name;
 278 }