drivers/bus/acpi/executer/amstoren.c

   1
   2 /******************************************************************************
   3  *
   4  * Module Name: amstoren - AML Interpreter object store support,
   5  *                        Store to Node (namespace object)
   6  *              $Revision$
   7  *
   8  *****************************************************************************/
   9
  10 /*
  11  *  Copyright (C) 2000, 2001 R. Byron Moore
  12  *
  13  *  This program is free software; you can redistribute it and/or modify
  14  *  it under the terms of the GNU General Public License as published by
  15  *  the Free Software Foundation; either version 2 of the License, or
  16  *  (at your option) any later version.
  17  *
  18  *  This program is distributed in the hope that it will be useful,
  19  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  *  GNU General Public License for more details.
  22  *
  23  *  You should have received a copy of the GNU General Public License
  24  *  along with this program; if not, write to the Free Software
  25  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  26  */
  27
  28
  29 #include "acpi.h"
  30 #include "acparser.h"
  31 #include "acdispat.h"
  32 #include "acinterp.h"
  33 #include "amlcode.h"
  34 #include "acnamesp.h"
  35 #include "actables.h"
  36
  37
  38 #define _COMPONENT          ACPI_EXECUTER
  39          MODULE_NAME         ("amstoren")
  40
  41
  42 /*******************************************************************************
  43  *
  44  * FUNCTION:    Acpi_aml_resolve_object
  45  *
  46  * PARAMETERS:  Source_desc_ptr     - Pointer to the source object
  47  *              Target_type         - Current type of the target
  48  *              Walk_state          - Current walk state
  49  *
  50  * RETURN:      Status, resolved object in Source_desc_ptr.
  51  *
  52  * DESCRIPTION: Resolve an object.  If the object is a reference, dereference
  53  *              it and return the actual object in the Source_desc_ptr.
  54  *
  55  ******************************************************************************/
  56
  57 ACPI_STATUS
  58 acpi_aml_resolve_object (
  59         ACPI_OPERAND_OBJECT     **source_desc_ptr,
  60         OBJECT_TYPE_INTERNAL    target_type,
  61         ACPI_WALK_STATE         *walk_state)
  62 {
  63         ACPI_OPERAND_OBJECT     *source_desc = *source_desc_ptr;
  64         ACPI_STATUS             status = AE_OK;
  65
  66
  67         /*
  68          * Ensure we have a Source that can be stored in the target
  69          */
  70         switch (target_type) {
  71
  72         /* This case handles the "interchangeable" types Integer, String, and Buffer. */
  73
  74         /*
  75          * These cases all require only Integers or values that
  76          * can be converted to Integers (Strings or Buffers)
  77          */
  78         case ACPI_TYPE_INTEGER:
  79         case ACPI_TYPE_FIELD_UNIT:
  80         case INTERNAL_TYPE_BANK_FIELD:
  81         case INTERNAL_TYPE_INDEX_FIELD:
  82
  83         /*
  84          * Stores into a Field/Region or into a Buffer/String
  85          * are all essentially the same.
  86          */
  87         case ACPI_TYPE_STRING:
  88         case ACPI_TYPE_BUFFER:
  89         case INTERNAL_TYPE_DEF_FIELD:
  90
  91                 /*
  92                  * If Source_desc is not a valid type, try to resolve it to one.
  93                  */
  94                 if ((source_desc->common.type != ACPI_TYPE_INTEGER)    &&
  95                         (source_desc->common.type != ACPI_TYPE_BUFFER)     &&
  96                         (source_desc->common.type != ACPI_TYPE_STRING)) {
  97                         /*
  98                          * Initially not a valid type, convert
  99                          */
 100                         status = acpi_aml_resolve_to_value (source_desc_ptr, walk_state);
 101                         if (ACPI_SUCCESS (status) &&
 102                                 (source_desc->common.type != ACPI_TYPE_INTEGER)    &&
 103                                 (source_desc->common.type != ACPI_TYPE_BUFFER)     &&
 104                                 (source_desc->common.type != ACPI_TYPE_STRING)) {
 105                                 /*
 106                                  * Conversion successful but still not a valid type
 107                                  */
 108                                 status = AE_AML_OPERAND_TYPE;
 109                         }
 110                 }
 111                 break;
 112
 113
 114         case INTERNAL_TYPE_ALIAS:
 115
 116                 /*
 117                  * Aliases are resolved by Acpi_aml_prep_operands
 118                  */
 119                 status = AE_AML_INTERNAL;
 120                 break;
 121
 122
 123         case ACPI_TYPE_PACKAGE:
 124         default:
 125
 126                 /*
 127                  * All other types than Alias and the various Fields come here,
 128                  * including the untyped case - ACPI_TYPE_ANY.
 129                  */
 130                 break;
 131         }
 132
 133         return (status);
 134 }
 135
 136
 137 /*******************************************************************************
 138  *
 139  * FUNCTION:    Acpi_aml_store_object
 140  *
 141  * PARAMETERS:  Source_desc         - Object to store
 142  *              Target_type         - Current type of the target
 143  *              Target_desc_ptr     - Pointer to the target
 144  *              Walk_state          - Current walk state
 145  *
 146  * RETURN:      Status
 147  *
 148  * DESCRIPTION: "Store" an object to another object.  This may include
 149  *              converting the source type to the target type (implicit
 150  *              conversion), and a copy of the value of the source to
 151  *              the target.
 152  *
 153  ******************************************************************************/
 154
 155 ACPI_STATUS
 156 acpi_aml_store_object (
 157         ACPI_OPERAND_OBJECT     *source_desc,
 158         OBJECT_TYPE_INTERNAL    target_type,
 159         ACPI_OPERAND_OBJECT     **target_desc_ptr,
 160         ACPI_WALK_STATE         *walk_state)
 161 {
 162         ACPI_OPERAND_OBJECT     *target_desc = *target_desc_ptr;
 163         ACPI_STATUS             status = AE_OK;
 164
 165
 166         /*
 167          * Perform the "implicit conversion" of the source to the current type
 168          * of the target - As per the ACPI specification.
 169          *
 170          * If no conversion performed, Source_desc is left alone, otherwise it
 171          * is updated with a new object.
 172          */
 173         status = acpi_aml_convert_to_target_type (target_type, &source_desc, walk_state);
 174         if (ACPI_FAILURE (status)) {
 175                 return (status);
 176         }
 177
 178         /*
 179          * We now have two objects of identical types, and we can perform a
 180          * copy of the *value* of the source object.
 181          */
 182         switch (target_type) {
 183         case ACPI_TYPE_ANY:
 184         case INTERNAL_TYPE_DEF_ANY:
 185
 186                 /*
 187                  * The target namespace node is uninitialized (has no target object),
 188                  * and will take on the type of the source object
 189                  */
 190
 191                 *target_desc_ptr = source_desc;
 192                 break;
 193
 194
 195         case ACPI_TYPE_INTEGER:
 196
 197                 target_desc->integer.value = source_desc->integer.value;
 198
 199                 /* Truncate value if we are executing from a 32-bit ACPI table */
 200
 201                 acpi_aml_truncate_for32bit_table (target_desc, walk_state);
 202                 break;
 203
 204
 205         case ACPI_TYPE_FIELD_UNIT:
 206
 207                 status = acpi_aml_copy_integer_to_field_unit (source_desc, target_desc);
 208                 break;
 209
 210
 211         case INTERNAL_TYPE_BANK_FIELD:
 212
 213                 status = acpi_aml_copy_integer_to_bank_field (source_desc, target_desc);
 214                 break;
 215
 216
 217         case INTERNAL_TYPE_INDEX_FIELD:
 218
 219                 status = acpi_aml_copy_integer_to_index_field (source_desc, target_desc);
 220                 break;
 221
 222
 223         case ACPI_TYPE_STRING:
 224
 225                 status = acpi_aml_copy_string_to_string (source_desc, target_desc);
 226                 break;
 227
 228
 229         case ACPI_TYPE_BUFFER:
 230
 231                 status = acpi_aml_copy_buffer_to_buffer (source_desc, target_desc);
 232                 break;
 233
 234
 235         case ACPI_TYPE_PACKAGE:
 236
 237                 /*
 238                  * TBD: [Unhandled] Not real sure what to do here
 239                  */
 240                 status = AE_NOT_IMPLEMENTED;
 241                 break;
 242
 243
 244         default:
 245
 246                 /*
 247                  * All other types come here.
 248                  */
 249                 status = AE_NOT_IMPLEMENTED;
 250                 break;
 251         }
 252
 253
 254         return (status);
 255 }
 256
 257