drivers/acpi/acpica/exresnte.c

   1 /******************************************************************************
   2  *
   3  * Module Name: exresnte - AML Interpreter object resolution
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2012, 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 #include <acpi/acpi.h>
  45 #include "accommon.h"
  46 #include "acdispat.h"
  47 #include "acinterp.h"
  48 #include "acnamesp.h"
  49
  50 #define _COMPONENT          ACPI_EXECUTER
  51 ACPI_MODULE_NAME("exresnte")
  52
  53 /*******************************************************************************
  54  *
  55  * FUNCTION:    acpi_ex_resolve_node_to_value
  56  *
  57  * PARAMETERS:  object_ptr      - Pointer to a location that contains
  58  *                                a pointer to a NS node, and will receive a
  59  *                                pointer to the resolved object.
  60  *              walk_state      - Current state. Valid only if executing AML
  61  *                                code. NULL if simply resolving an object
  62  *
  63  * RETURN:      Status
  64  *
  65  * DESCRIPTION: Resolve a Namespace node to a valued object
  66  *
  67  * Note: for some of the data types, the pointer attached to the Node
  68  * can be either a pointer to an actual internal object or a pointer into the
  69  * AML stream itself. These types are currently:
  70  *
  71  *      ACPI_TYPE_INTEGER
  72  *      ACPI_TYPE_STRING
  73  *      ACPI_TYPE_BUFFER
  74  *      ACPI_TYPE_MUTEX
  75  *      ACPI_TYPE_PACKAGE
  76  *
  77  ******************************************************************************/
  78 acpi_status
  79 acpi_ex_resolve_node_to_value(struct acpi_namespace_node **object_ptr,
  80                               struct acpi_walk_state *walk_state)
  81 {
  82         acpi_status status = AE_OK;
  83         union acpi_operand_object *source_desc;
  84         union acpi_operand_object *obj_desc = NULL;
  85         struct acpi_namespace_node *node;
  86         acpi_object_type entry_type;
  87
  88         ACPI_FUNCTION_TRACE(ex_resolve_node_to_value);
  89
  90         /*
  91          * The stack pointer points to a struct acpi_namespace_node (Node). Get the
  92          * object that is attached to the Node.
  93          */
  94         node = *object_ptr;
  95         source_desc = acpi_ns_get_attached_object(node);
  96         entry_type = acpi_ns_get_type((acpi_handle) node);
  97
  98         ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Entry=%p SourceDesc=%p [%s]\n",
  99                           node, source_desc,
 100                           acpi_ut_get_type_name(entry_type)));
 101
 102         if ((entry_type == ACPI_TYPE_LOCAL_ALIAS) ||
 103             (entry_type == ACPI_TYPE_LOCAL_METHOD_ALIAS)) {
 104
 105                 /* There is always exactly one level of indirection */
 106
 107                 node = ACPI_CAST_PTR(struct acpi_namespace_node, node->object);
 108                 source_desc = acpi_ns_get_attached_object(node);
 109                 entry_type = acpi_ns_get_type((acpi_handle) node);
 110                 *object_ptr = node;
 111         }
 112
 113         /*
 114          * Several object types require no further processing:
 115          * 1) Device/Thermal objects don't have a "real" subobject, return the Node
 116          * 2) Method locals and arguments have a pseudo-Node
 117          * 3) 10/2007: Added method type to assist with Package construction.
 118          */
 119         if ((entry_type == ACPI_TYPE_DEVICE) ||
 120             (entry_type == ACPI_TYPE_THERMAL) ||
 121             (entry_type == ACPI_TYPE_METHOD) ||
 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 (source_desc->common.type != 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 (source_desc->common.type != 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 (source_desc->common.type != 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 (source_desc->common.type != 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_POWER:
 218         case ACPI_TYPE_PROCESSOR:
 219         case ACPI_TYPE_EVENT:
 220         case ACPI_TYPE_REGION:
 221
 222                 /* Return an additional reference to the object */
 223
 224                 obj_desc = source_desc;
 225                 acpi_ut_add_reference(obj_desc);
 226                 break;
 227
 228                 /* TYPE_ANY is untyped, and thus there is no object associated with it */
 229
 230         case ACPI_TYPE_ANY:
 231
 232                 ACPI_ERROR((AE_INFO,
 233                             "Untyped entry %p, no attached object!", node));
 234
 235                 return_ACPI_STATUS(AE_AML_OPERAND_TYPE);        /* Cannot be AE_TYPE */
 236
 237         case ACPI_TYPE_LOCAL_REFERENCE:
 238
 239                 switch (source_desc->reference.class) {
 240                 case ACPI_REFCLASS_TABLE:       /* This is a ddb_handle */
 241                 case ACPI_REFCLASS_REFOF:
 242                 case ACPI_REFCLASS_INDEX:
 243
 244                         /* Return an additional reference to the object */
 245
 246                         obj_desc = source_desc;
 247                         acpi_ut_add_reference(obj_desc);
 248                         break;
 249
 250                 default:
 251                         /* No named references are allowed here */
 252
 253                         ACPI_ERROR((AE_INFO,
 254                                     "Unsupported Reference type 0x%X",
 255                                     source_desc->reference.class));
 256
 257                         return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 258                 }
 259                 break;
 260
 261         default:
 262
 263                 /* Default case is for unknown types */
 264
 265                 ACPI_ERROR((AE_INFO,
 266                             "Node %p - Unknown object type 0x%X",
 267                             node, entry_type));
 268
 269                 return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 270
 271         }                       /* switch (entry_type) */
 272
 273         /* Return the object descriptor */
 274
 275         *object_ptr = (void *)obj_desc;
 276         return_ACPI_STATUS(status);
 277 }