err.no Git - linux-2.6/blob - drivers/acpi/executer/exresnte.c

   1
   2 /******************************************************************************
   3  *
   4  * Module Name: exresnte - AML Interpreter object resolution
   5  *
   6  *****************************************************************************/
   7
   8 /*
   9  * Copyright (C) 2000 - 2007, R. Byron Moore
  10  * All rights reserved.
  11  *
  12  * Redistribution and use in source and binary forms, with or without
  13  * modification, are permitted provided that the following conditions
  14  * are met:
  15  * 1. Redistributions of source code must retain the above copyright
  16  *    notice, this list of conditions, and the following disclaimer,
  17  *    without modification.
  18  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  19  *    substantially similar to the "NO WARRANTY" disclaimer below
  20  *    ("Disclaimer") and any redistribution must be conditioned upon
  21  *    including a substantially similar Disclaimer requirement for further
  22  *    binary redistribution.
  23  * 3. Neither the names of the above-listed copyright holders nor the names
  24  *    of any contributors may be used to endorse or promote products derived
  25  *    from this software without specific prior written permission.
  26  *
  27  * Alternatively, this software may be distributed under the terms of the
  28  * GNU General Public License ("GPL") version 2 as published by the Free
  29  * Software Foundation.
  30  *
  31  * NO WARRANTY
  32  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  33  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  34  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  35  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  36  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  37  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  38  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  39  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  40  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  41  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  42  * POSSIBILITY OF SUCH DAMAGES.
  43  */
  44
  45 #include <acpi/acpi.h>
  46 #include <acpi/acdispat.h>
  47 #include <acpi/acinterp.h>
  48 #include <acpi/acnamesp.h>
  49 #include <acpi/acparser.h>
  50 #include <acpi/amlcode.h>
  51
  52 #define _COMPONENT          ACPI_EXECUTER
  53 ACPI_MODULE_NAME("exresnte")
  54
  55 /*******************************************************************************
  56  *
  57  * FUNCTION:    acpi_ex_resolve_node_to_value
  58  *
  59  * PARAMETERS:  object_ptr      - Pointer to a location that contains
  60  *                                a pointer to a NS node, and will receive a
  61  *                                pointer to the resolved object.
  62  *              walk_state      - Current state.  Valid only if executing AML
  63  *                                code.  NULL if simply resolving an object
  64  *
  65  * RETURN:      Status
  66  *
  67  * DESCRIPTION: Resolve a Namespace node to a valued object
  68  *
  69  * Note: for some of the data types, the pointer attached to the Node
  70  * can be either a pointer to an actual internal object or a pointer into the
  71  * AML stream itself.  These types are currently:
  72  *
  73  *      ACPI_TYPE_INTEGER
  74  *      ACPI_TYPE_STRING
  75  *      ACPI_TYPE_BUFFER
  76  *      ACPI_TYPE_MUTEX
  77  *      ACPI_TYPE_PACKAGE
  78  *
  79  ******************************************************************************/
  80 acpi_status
  81 acpi_ex_resolve_node_to_value(struct acpi_namespace_node **object_ptr,
  82                               struct acpi_walk_state *walk_state)
  83 {
  84         acpi_status status = AE_OK;
  85         union acpi_operand_object *source_desc;
  86         union acpi_operand_object *obj_desc = NULL;
  87         struct acpi_namespace_node *node;
  88         acpi_object_type entry_type;
  89
  90         ACPI_FUNCTION_TRACE(ex_resolve_node_to_value);
  91
  92         /*
  93          * The stack pointer points to a struct acpi_namespace_node (Node).  Get the
  94          * object that is attached to the Node.
  95          */
  96         node = *object_ptr;
  97         source_desc = acpi_ns_get_attached_object(node);
  98         entry_type = acpi_ns_get_type((acpi_handle) node);
  99
 100         ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Entry=%p SourceDesc=%p [%s]\n",
 101                           node, source_desc,
 102                           acpi_ut_get_type_name(entry_type)));
 103
 104         if ((entry_type == ACPI_TYPE_LOCAL_ALIAS) ||
 105             (entry_type == ACPI_TYPE_LOCAL_METHOD_ALIAS)) {
 106
 107                 /* There is always exactly one level of indirection */
 108
 109                 node = ACPI_CAST_PTR(struct acpi_namespace_node, node->object);
 110                 source_desc = acpi_ns_get_attached_object(node);
 111                 entry_type = acpi_ns_get_type((acpi_handle) node);
 112                 *object_ptr = node;
 113         }
 114
 115         /*
 116          * Several object types require no further processing:
 117          * 1) Device/Thermal objects don't have a "real" subobject, return the Node
 118          * 2) Method locals and arguments have a pseudo-Node
 119          */
 120         if ((entry_type == ACPI_TYPE_DEVICE) ||
 121             (entry_type == ACPI_TYPE_THERMAL) ||
 122             (node->flags & (ANOBJ_METHOD_ARG | ANOBJ_METHOD_LOCAL))) {
 123                 return_ACPI_STATUS(AE_OK);
 124         }
 125
 126         if (!source_desc) {
 127                 ACPI_ERROR((AE_INFO, "No object attached to node %p", node));
 128                 return_ACPI_STATUS(AE_AML_NO_OPERAND);
 129         }
 130
 131         /*
 132          * Action is based on the type of the Node, which indicates the type
 133          * of the attached object or pointer
 134          */
 135         switch (entry_type) {
 136         case ACPI_TYPE_PACKAGE:
 137
 138                 if (ACPI_GET_OBJECT_TYPE(source_desc) != ACPI_TYPE_PACKAGE) {
 139                         ACPI_ERROR((AE_INFO, "Object not a Package, type %s",
 140                                     acpi_ut_get_object_type_name(source_desc)));
 141                         return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 142                 }
 143
 144                 status = acpi_ds_get_package_arguments(source_desc);
 145                 if (ACPI_SUCCESS(status)) {
 146
 147                         /* Return an additional reference to the object */
 148
 149                         obj_desc = source_desc;
 150                         acpi_ut_add_reference(obj_desc);
 151                 }
 152                 break;
 153
 154         case ACPI_TYPE_BUFFER:
 155
 156                 if (ACPI_GET_OBJECT_TYPE(source_desc) != ACPI_TYPE_BUFFER) {
 157                         ACPI_ERROR((AE_INFO, "Object not a Buffer, type %s",
 158                                     acpi_ut_get_object_type_name(source_desc)));
 159                         return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 160                 }
 161
 162                 status = acpi_ds_get_buffer_arguments(source_desc);
 163                 if (ACPI_SUCCESS(status)) {
 164
 165                         /* Return an additional reference to the object */
 166
 167                         obj_desc = source_desc;
 168                         acpi_ut_add_reference(obj_desc);
 169                 }
 170                 break;
 171
 172         case ACPI_TYPE_STRING:
 173
 174                 if (ACPI_GET_OBJECT_TYPE(source_desc) != ACPI_TYPE_STRING) {
 175                         ACPI_ERROR((AE_INFO, "Object not a String, type %s",
 176                                     acpi_ut_get_object_type_name(source_desc)));
 177                         return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 178                 }
 179
 180                 /* Return an additional reference to the object */
 181
 182                 obj_desc = source_desc;
 183                 acpi_ut_add_reference(obj_desc);
 184                 break;
 185
 186         case ACPI_TYPE_INTEGER:
 187
 188                 if (ACPI_GET_OBJECT_TYPE(source_desc) != ACPI_TYPE_INTEGER) {
 189                         ACPI_ERROR((AE_INFO, "Object not a Integer, type %s",
 190                                     acpi_ut_get_object_type_name(source_desc)));
 191                         return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 192                 }
 193
 194                 /* Return an additional reference to the object */
 195
 196                 obj_desc = source_desc;
 197                 acpi_ut_add_reference(obj_desc);
 198                 break;
 199
 200         case ACPI_TYPE_BUFFER_FIELD:
 201         case ACPI_TYPE_LOCAL_REGION_FIELD:
 202         case ACPI_TYPE_LOCAL_BANK_FIELD:
 203         case ACPI_TYPE_LOCAL_INDEX_FIELD:
 204
 205                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 206                                   "FieldRead Node=%p SourceDesc=%p Type=%X\n",
 207                                   node, source_desc, entry_type));
 208
 209                 status =
 210                     acpi_ex_read_data_from_field(walk_state, source_desc,
 211                                                  &obj_desc);
 212                 break;
 213
 214                 /* For these objects, just return the object attached to the Node */
 215
 216         case ACPI_TYPE_MUTEX:
 217         case ACPI_TYPE_METHOD:
 218         case ACPI_TYPE_POWER:
 219         case ACPI_TYPE_PROCESSOR:
 220         case ACPI_TYPE_EVENT:
 221         case ACPI_TYPE_REGION:
 222
 223                 /* Return an additional reference to the object */
 224
 225                 obj_desc = source_desc;
 226                 acpi_ut_add_reference(obj_desc);
 227                 break;
 228
 229                 /* TYPE_ANY is untyped, and thus there is no object associated with it */
 230
 231         case ACPI_TYPE_ANY:
 232
 233                 ACPI_ERROR((AE_INFO,
 234                             "Untyped entry %p, no attached object!", node));
 235
 236                 return_ACPI_STATUS(AE_AML_OPERAND_TYPE);        /* Cannot be AE_TYPE */
 237
 238         case ACPI_TYPE_LOCAL_REFERENCE:
 239
 240                 switch (source_desc->reference.opcode) {
 241                 case AML_LOAD_OP:
 242
 243                         /* This is a ddb_handle */
 244                         /* Return an additional reference to the object */
 245
 246                 case AML_REF_OF_OP:
 247
 248                         obj_desc = source_desc;
 249                         acpi_ut_add_reference(obj_desc);
 250                         break;
 251
 252                 default:
 253                         /* No named references are allowed here */
 254
 255                         ACPI_ERROR((AE_INFO,
 256                                     "Unsupported Reference opcode %X (%s)",
 257                                     source_desc->reference.opcode,
 258                                     acpi_ps_get_opcode_name(source_desc->
 259                                                             reference.opcode)));
 260
 261                         return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 262                 }
 263                 break;
 264
 265         default:
 266
 267                 /* Default case is for unknown types */
 268
 269                 ACPI_ERROR((AE_INFO,
 270                             "Node %p - Unknown object type %X",
 271                             node, entry_type));
 272
 273                 return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 274
 275         }                       /* switch (entry_type) */
 276
 277         /* Return the object descriptor */
 278
 279         *object_ptr = (void *)obj_desc;
 280         return_ACPI_STATUS(status);
 281 }