drivers/acpi/parser/psutils.c

   1 /******************************************************************************
   2  *
   3  * Module Name: psutils - Parser miscellaneous utilities (Parser only)
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2005, R. Byron Moore
   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/acpi.h>
  46 #include <acpi/acparser.h>
  47 #include <acpi/amlcode.h>
  48 #include <acpi/acnamesp.h>
  49
  50 #define _COMPONENT          ACPI_PARSER
  51          ACPI_MODULE_NAME    ("psutils")
  52
  53
  54 /*******************************************************************************
  55  *
  56  * FUNCTION:    acpi_ps_create_scope_op
  57  *
  58  * PARAMETERS:  None
  59  *
  60  * RETURN:      scope_op
  61  *
  62  * DESCRIPTION: Create a Scope and associated namepath op with the root name
  63  *
  64  ******************************************************************************/
  65
  66 union acpi_parse_object *
  67 acpi_ps_create_scope_op (
  68         void)
  69 {
  70         union acpi_parse_object         *scope_op;
  71
  72
  73         scope_op = acpi_ps_alloc_op (AML_SCOPE_OP);
  74         if (!scope_op) {
  75                 return (NULL);
  76         }
  77
  78
  79         scope_op->named.name = ACPI_ROOT_NAME;
  80         return (scope_op);
  81 }
  82
  83
  84 /*******************************************************************************
  85  *
  86  * FUNCTION:    acpi_ps_init_op
  87  *
  88  * PARAMETERS:  Op              - A newly allocated Op object
  89  *              Opcode          - Opcode to store in the Op
  90  *
  91  * RETURN:      Status
  92  *
  93  * DESCRIPTION: Allocate an acpi_op, choose op type (and thus size) based on
  94  *              opcode
  95  *
  96  ******************************************************************************/
  97
  98 void
  99 acpi_ps_init_op (
 100         union acpi_parse_object         *op,
 101         u16                             opcode)
 102 {
 103         ACPI_FUNCTION_ENTRY ();
 104
 105
 106         op->common.data_type = ACPI_DESC_TYPE_PARSER;
 107         op->common.aml_opcode = opcode;
 108
 109         ACPI_DISASM_ONLY_MEMBERS (ACPI_STRNCPY (op->common.aml_op_name,
 110                         (acpi_ps_get_opcode_info (opcode))->name, sizeof (op->common.aml_op_name)));
 111 }
 112
 113
 114 /*******************************************************************************
 115  *
 116  * FUNCTION:    acpi_ps_alloc_op
 117  *
 118  * PARAMETERS:  Opcode          - Opcode that will be stored in the new Op
 119  *
 120  * RETURN:      Pointer to the new Op.
 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 union acpi_parse_object*
 129 acpi_ps_alloc_op (
 130         u16                             opcode)
 131 {
 132         union acpi_parse_object         *op;
 133         const struct acpi_opcode_info   *op_info;
 134         u8                              flags = ACPI_PARSEOP_GENERIC;
 135
 136
 137         ACPI_FUNCTION_ENTRY ();
 138
 139
 140         op_info = acpi_ps_get_opcode_info (opcode);
 141
 142         /* Determine type of parse_op required */
 143
 144         if (op_info->flags & AML_DEFER) {
 145                 flags = ACPI_PARSEOP_DEFERRED;
 146         }
 147         else if (op_info->flags & AML_NAMED) {
 148                 flags = ACPI_PARSEOP_NAMED;
 149         }
 150         else if (opcode == AML_INT_BYTELIST_OP) {
 151                 flags = ACPI_PARSEOP_BYTELIST;
 152         }
 153
 154         /* Allocate the minimum required size object */
 155
 156         if (flags == ACPI_PARSEOP_GENERIC) {
 157                 /* The generic op (default) is by far the most common (16 to 1) */
 158
 159                 op = acpi_ut_acquire_from_cache (ACPI_MEM_LIST_PSNODE);
 160         }
 161         else {
 162                 /* Extended parseop */
 163
 164                 op = acpi_ut_acquire_from_cache (ACPI_MEM_LIST_PSNODE_EXT);
 165         }
 166
 167         /* Initialize the Op */
 168
 169         if (op) {
 170                 acpi_ps_init_op (op, opcode);
 171                 op->common.flags = flags;
 172         }
 173
 174         return (op);
 175 }
 176
 177
 178 /*******************************************************************************
 179  *
 180  * FUNCTION:    acpi_ps_free_op
 181  *
 182  * PARAMETERS:  Op              - Op to be freed
 183  *
 184  * RETURN:      None.
 185  *
 186  * DESCRIPTION: Free an Op object.  Either put it on the GENERIC_OP cache list
 187  *              or actually free it.
 188  *
 189  ******************************************************************************/
 190
 191 void
 192 acpi_ps_free_op (
 193         union acpi_parse_object         *op)
 194 {
 195         ACPI_FUNCTION_NAME ("ps_free_op");
 196
 197
 198         if (op->common.aml_opcode == AML_INT_RETURN_VALUE_OP) {
 199                 ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS, "Free retval op: %p\n", op));
 200         }
 201
 202         if (op->common.flags & ACPI_PARSEOP_GENERIC) {
 203                 acpi_ut_release_to_cache (ACPI_MEM_LIST_PSNODE, op);
 204         }
 205         else {
 206                 acpi_ut_release_to_cache (ACPI_MEM_LIST_PSNODE_EXT, op);
 207         }
 208 }
 209
 210
 211 #ifdef ACPI_ENABLE_OBJECT_CACHE
 212 /*******************************************************************************
 213  *
 214  * FUNCTION:    acpi_ps_delete_parse_cache
 215  *
 216  * PARAMETERS:  None
 217  *
 218  * RETURN:      None
 219  *
 220  * DESCRIPTION: Free all objects that are on the parse cache list.
 221  *
 222  ******************************************************************************/
 223
 224 void
 225 acpi_ps_delete_parse_cache (
 226         void)
 227 {
 228         ACPI_FUNCTION_TRACE ("ps_delete_parse_cache");
 229
 230
 231         acpi_ut_delete_generic_cache (ACPI_MEM_LIST_PSNODE);
 232         acpi_ut_delete_generic_cache (ACPI_MEM_LIST_PSNODE_EXT);
 233         return_VOID;
 234 }
 235 #endif
 236
 237
 238 /*******************************************************************************
 239  *
 240  * FUNCTION:    Utility functions
 241  *
 242  * DESCRIPTION: Low level character and object functions
 243  *
 244  ******************************************************************************/
 245
 246
 247 /*
 248  * Is "c" a namestring lead character?
 249  */
 250 u8
 251 acpi_ps_is_leading_char (
 252         u32                             c)
 253 {
 254         return ((u8) (c == '_' || (c >= 'A' && c <= 'Z')));
 255 }
 256
 257
 258 /*
 259  * Is "c" a namestring prefix character?
 260  */
 261 u8
 262 acpi_ps_is_prefix_char (
 263         u32                             c)
 264 {
 265         return ((u8) (c == '\\' || c == '^'));
 266 }
 267
 268
 269 /*
 270  * Get op's name (4-byte name segment) or 0 if unnamed
 271  */
 272 #ifdef ACPI_FUTURE_USAGE
 273 u32
 274 acpi_ps_get_name (
 275         union acpi_parse_object         *op)
 276 {
 277
 278
 279         /* The "generic" object has no name associated with it */
 280
 281         if (op->common.flags & ACPI_PARSEOP_GENERIC) {
 282                 return (0);
 283         }
 284
 285         /* Only the "Extended" parse objects have a name */
 286
 287         return (op->named.name);
 288 }
 289 #endif  /*  ACPI_FUTURE_USAGE  */
 290
 291
 292 /*
 293  * Set op's name
 294  */
 295 void
 296 acpi_ps_set_name (
 297         union acpi_parse_object         *op,
 298         u32                             name)
 299 {
 300
 301         /* The "generic" object has no name associated with it */
 302
 303         if (op->common.flags & ACPI_PARSEOP_GENERIC) {
 304                 return;
 305         }
 306
 307         op->named.name = name;
 308 }
 309