drivers/acpi/executer/exresnte.c

   1
   2 /******************************************************************************
   3  *
   4  * Module Name: exresnte - AML Interpreter object resolution
   5  *
   6  *****************************************************************************/
   7
   8 /*
   9  * Copyright (C) 2000 - 2005, 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 source_desc=%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                 /* There is always exactly one level of indirection */
 107
 108                 node = ACPI_CAST_PTR(struct acpi_namespace_node, node->object);
 109                 source_desc = acpi_ns_get_attached_object(node);
 110                 entry_type = acpi_ns_get_type((acpi_handle) node);
 111                 *object_ptr = node;
 112         }
 113
 114         /*
 115          * Several object types require no further processing:
 116          * 1) Devices rarely have an attached object, return the Node
 117          * 2) Method locals and arguments have a pseudo-Node
 118          */
 119         if (entry_type == ACPI_TYPE_DEVICE ||
 120             (node->flags & (ANOBJ_METHOD_ARG | ANOBJ_METHOD_LOCAL))) {
 121                 return_ACPI_STATUS(AE_OK);
 122         }
 123
 124         if (!source_desc) {
 125                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 126                                   "No object attached to node %p\n", node));
 127                 return_ACPI_STATUS(AE_AML_NO_OPERAND);
 128         }
 129
 130         /*
 131          * Action is based on the type of the Node, which indicates the type
 132          * of the attached object or pointer
 133          */
 134         switch (entry_type) {
 135         case ACPI_TYPE_PACKAGE:
 136
 137                 if (ACPI_GET_OBJECT_TYPE(source_desc) != ACPI_TYPE_PACKAGE) {
 138                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 139                                           "Object not a Package, type %s\n",
 140                                           acpi_ut_get_object_type_name
 141                                           (source_desc)));
 142                         return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 143                 }
 144
 145                 status = acpi_ds_get_package_arguments(source_desc);
 146                 if (ACPI_SUCCESS(status)) {
 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_DEBUG_PRINT((ACPI_DB_ERROR,
 158                                           "Object not a Buffer, type %s\n",
 159                                           acpi_ut_get_object_type_name
 160                                           (source_desc)));
 161                         return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 162                 }
 163
 164                 status = acpi_ds_get_buffer_arguments(source_desc);
 165                 if (ACPI_SUCCESS(status)) {
 166                         /* Return an additional reference to the object */
 167
 168                         obj_desc = source_desc;
 169                         acpi_ut_add_reference(obj_desc);
 170                 }
 171                 break;
 172
 173         case ACPI_TYPE_STRING:
 174
 175                 if (ACPI_GET_OBJECT_TYPE(source_desc) != ACPI_TYPE_STRING) {
 176                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 177                                           "Object not a String, type %s\n",
 178                                           acpi_ut_get_object_type_name
 179                                           (source_desc)));
 180                         return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 181                 }
 182
 183                 /* Return an additional reference to the object */
 184
 185                 obj_desc = source_desc;
 186                 acpi_ut_add_reference(obj_desc);
 187                 break;
 188
 189         case ACPI_TYPE_INTEGER:
 190
 191                 if (ACPI_GET_OBJECT_TYPE(source_desc) != ACPI_TYPE_INTEGER) {
 192                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 193                                           "Object not a Integer, type %s\n",
 194                                           acpi_ut_get_object_type_name
 195                                           (source_desc)));
 196                         return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 197                 }
 198
 199                 /* Return an additional reference to the object */
 200
 201                 obj_desc = source_desc;
 202                 acpi_ut_add_reference(obj_desc);
 203                 break;
 204
 205         case ACPI_TYPE_BUFFER_FIELD:
 206         case ACPI_TYPE_LOCAL_REGION_FIELD:
 207         case ACPI_TYPE_LOCAL_BANK_FIELD:
 208         case ACPI_TYPE_LOCAL_INDEX_FIELD:
 209
 210                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 211                                   "field_read Node=%p source_desc=%p Type=%X\n",
 212                                   node, source_desc, entry_type));
 213
 214                 status =
 215                     acpi_ex_read_data_from_field(walk_state, source_desc,
 216                                                  &obj_desc);
 217                 break;
 218
 219                 /* For these objects, just return the object attached to the Node */
 220
 221         case ACPI_TYPE_MUTEX:
 222         case ACPI_TYPE_METHOD:
 223         case ACPI_TYPE_POWER:
 224         case ACPI_TYPE_PROCESSOR:
 225         case ACPI_TYPE_THERMAL:
 226         case ACPI_TYPE_EVENT:
 227         case ACPI_TYPE_REGION:
 228
 229                 /* Return an additional reference to the object */
 230
 231                 obj_desc = source_desc;
 232                 acpi_ut_add_reference(obj_desc);
 233                 break;
 234
 235                 /* TYPE_ANY is untyped, and thus there is no object associated with it */
 236
 237         case ACPI_TYPE_ANY:
 238
 239                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 240                                   "Untyped entry %p, no attached object!\n",
 241                                   node));
 242
 243                 return_ACPI_STATUS(AE_AML_OPERAND_TYPE);        /* Cannot be AE_TYPE */
 244
 245         case ACPI_TYPE_LOCAL_REFERENCE:
 246
 247                 switch (source_desc->reference.opcode) {
 248                 case AML_LOAD_OP:
 249
 250                         /* This is a ddb_handle */
 251                         /* Return an additional reference to the object */
 252
 253                         obj_desc = source_desc;
 254                         acpi_ut_add_reference(obj_desc);
 255                         break;
 256
 257                 default:
 258                         /* No named references are allowed here */
 259
 260                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 261                                           "Unsupported Reference opcode %X (%s)\n",
 262                                           source_desc->reference.opcode,
 263                                           acpi_ps_get_opcode_name(source_desc->
 264                                                                   reference.
 265                                                                   opcode)));
 266
 267                         return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 268                 }
 269                 break;
 270
 271         default:
 272
 273                 /* Default case is for unknown types */
 274
 275                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 276                                   "Node %p - Unknown object type %X\n",
 277                                   node, entry_type));
 278
 279                 return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 280
 281         }                       /* switch (entry_type) */
 282
 283         /* Return the object descriptor */
 284
 285         *object_ptr = (void *)obj_desc;
 286         return_ACPI_STATUS(status);
 287 }