drivers/acpi/parser/psscope.c

   1 /******************************************************************************
   2  *
   3  * Module Name: psscope - Parser scope stack management routines
   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
  48 #define _COMPONENT          ACPI_PARSER
  49          ACPI_MODULE_NAME    ("psscope")
  50
  51
  52 /*******************************************************************************
  53  *
  54  * FUNCTION:    acpi_ps_get_parent_scope
  55  *
  56  * PARAMETERS:  parser_state        - Current parser state object
  57  *
  58  * RETURN:      Pointer to an Op object
  59  *
  60  * DESCRIPTION: Get parent of current op being parsed
  61  *
  62  ******************************************************************************/
  63
  64 union acpi_parse_object *
  65 acpi_ps_get_parent_scope (
  66         struct acpi_parse_state         *parser_state)
  67 {
  68         return (parser_state->scope->parse_scope.op);
  69 }
  70
  71
  72 /*******************************************************************************
  73  *
  74  * FUNCTION:    acpi_ps_has_completed_scope
  75  *
  76  * PARAMETERS:  parser_state        - Current parser state object
  77  *
  78  * RETURN:      Boolean, TRUE = scope completed.
  79  *
  80  * DESCRIPTION: Is parsing of current argument complete?  Determined by
  81  *              1) AML pointer is at or beyond the end of the scope
  82  *              2) The scope argument count has reached zero.
  83  *
  84  ******************************************************************************/
  85
  86 u8
  87 acpi_ps_has_completed_scope (
  88         struct acpi_parse_state         *parser_state)
  89 {
  90         return ((u8) ((parser_state->aml >= parser_state->scope->parse_scope.arg_end ||
  91                            !parser_state->scope->parse_scope.arg_count)));
  92 }
  93
  94
  95 /*******************************************************************************
  96  *
  97  * FUNCTION:    acpi_ps_init_scope
  98  *
  99  * PARAMETERS:  parser_state        - Current parser state object
 100  *              Root                - the Root Node of this new scope
 101  *
 102  * RETURN:      Status
 103  *
 104  * DESCRIPTION: Allocate and init a new scope object
 105  *
 106  ******************************************************************************/
 107
 108 acpi_status
 109 acpi_ps_init_scope (
 110         struct acpi_parse_state         *parser_state,
 111         union acpi_parse_object         *root_op)
 112 {
 113         union acpi_generic_state        *scope;
 114
 115
 116         ACPI_FUNCTION_TRACE_PTR ("ps_init_scope", root_op);
 117
 118
 119         scope = acpi_ut_create_generic_state ();
 120         if (!scope) {
 121                 return_ACPI_STATUS (AE_NO_MEMORY);
 122         }
 123
 124         scope->common.data_type     = ACPI_DESC_TYPE_STATE_RPSCOPE;
 125         scope->parse_scope.op       = root_op;
 126         scope->parse_scope.arg_count = ACPI_VAR_ARGS;
 127         scope->parse_scope.arg_end  = parser_state->aml_end;
 128         scope->parse_scope.pkg_end  = parser_state->aml_end;
 129
 130         parser_state->scope         = scope;
 131         parser_state->start_op      = root_op;
 132
 133         return_ACPI_STATUS (AE_OK);
 134 }
 135
 136
 137 /*******************************************************************************
 138  *
 139  * FUNCTION:    acpi_ps_push_scope
 140  *
 141  * PARAMETERS:  parser_state        - Current parser state object
 142  *              Op                  - Current op to be pushed
 143  *              remaining_args      - List of args remaining
 144  *              arg_count           - Fixed or variable number of args
 145  *
 146  * RETURN:      Status
 147  *
 148  * DESCRIPTION: Push current op to begin parsing its argument
 149  *
 150  ******************************************************************************/
 151
 152 acpi_status
 153 acpi_ps_push_scope (
 154         struct acpi_parse_state         *parser_state,
 155         union acpi_parse_object         *op,
 156         u32                             remaining_args,
 157         u32                             arg_count)
 158 {
 159         union acpi_generic_state        *scope;
 160
 161
 162         ACPI_FUNCTION_TRACE_PTR ("ps_push_scope", op);
 163
 164
 165         scope = acpi_ut_create_generic_state ();
 166         if (!scope) {
 167                 return_ACPI_STATUS (AE_NO_MEMORY);
 168         }
 169
 170         scope->common.data_type        = ACPI_DESC_TYPE_STATE_PSCOPE;
 171         scope->parse_scope.op          = op;
 172         scope->parse_scope.arg_list    = remaining_args;
 173         scope->parse_scope.arg_count   = arg_count;
 174         scope->parse_scope.pkg_end     = parser_state->pkg_end;
 175
 176         /* Push onto scope stack */
 177
 178         acpi_ut_push_generic_state (&parser_state->scope, scope);
 179
 180         if (arg_count == ACPI_VAR_ARGS) {
 181                 /* multiple arguments */
 182
 183                 scope->parse_scope.arg_end = parser_state->pkg_end;
 184         }
 185         else {
 186                 /* single argument */
 187
 188                 scope->parse_scope.arg_end = ACPI_TO_POINTER (ACPI_MAX_PTR);
 189         }
 190
 191         return_ACPI_STATUS (AE_OK);
 192 }
 193
 194
 195 /*******************************************************************************
 196  *
 197  * FUNCTION:    acpi_ps_pop_scope
 198  *
 199  * PARAMETERS:  parser_state        - Current parser state object
 200  *              Op                  - Where the popped op is returned
 201  *              arg_list            - Where the popped "next argument" is
 202  *                                    returned
 203  *              arg_count           - Count of objects in arg_list
 204  *
 205  * RETURN:      Status
 206  *
 207  * DESCRIPTION: Return to parsing a previous op
 208  *
 209  ******************************************************************************/
 210
 211 void
 212 acpi_ps_pop_scope (
 213         struct acpi_parse_state         *parser_state,
 214         union acpi_parse_object         **op,
 215         u32                             *arg_list,
 216         u32                             *arg_count)
 217 {
 218         union acpi_generic_state        *scope = parser_state->scope;
 219
 220
 221         ACPI_FUNCTION_TRACE ("ps_pop_scope");
 222
 223
 224         /*
 225          * Only pop the scope if there is in fact a next scope
 226          */
 227         if (scope->common.next) {
 228                 scope = acpi_ut_pop_generic_state (&parser_state->scope);
 229
 230                 /* return to parsing previous op */
 231
 232                 *op                     = scope->parse_scope.op;
 233                 *arg_list               = scope->parse_scope.arg_list;
 234                 *arg_count              = scope->parse_scope.arg_count;
 235                 parser_state->pkg_end   = scope->parse_scope.pkg_end;
 236
 237                 /* All done with this scope state structure */
 238
 239                 acpi_ut_delete_generic_state (scope);
 240         }
 241         else {
 242                 /* empty parse stack, prepare to fetch next opcode */
 243
 244                 *op                     = NULL;
 245                 *arg_list               = 0;
 246                 *arg_count              = 0;
 247         }
 248
 249         ACPI_DEBUG_PRINT ((ACPI_DB_PARSE, "Popped Op %p Args %X\n", *op, *arg_count));
 250         return_VOID;
 251 }
 252
 253
 254 /*******************************************************************************
 255  *
 256  * FUNCTION:    acpi_ps_cleanup_scope
 257  *
 258  * PARAMETERS:  parser_state        - Current parser state object
 259  *
 260  * RETURN:      Status
 261  *
 262  * DESCRIPTION: Destroy available list, remaining stack levels, and return
 263  *              root scope
 264  *
 265  ******************************************************************************/
 266
 267 void
 268 acpi_ps_cleanup_scope (
 269         struct acpi_parse_state         *parser_state)
 270 {
 271         union acpi_generic_state        *scope;
 272
 273
 274         ACPI_FUNCTION_TRACE_PTR ("ps_cleanup_scope", parser_state);
 275
 276
 277         if (!parser_state) {
 278                 return_VOID;
 279         }
 280
 281         /* Delete anything on the scope stack */
 282
 283         while (parser_state->scope) {
 284                 scope = acpi_ut_pop_generic_state (&parser_state->scope);
 285                 acpi_ut_delete_generic_state (scope);
 286         }
 287
 288         return_VOID;
 289 }
 290