git.oblomov.eu Git - linux-2.6/blob - drivers/acpi/acpica/exresnte.c

   1
   2 /******************************************************************************
   3  *
   4  * Module Name: exresnte - AML Interpreter object resolution
   5  *
   6  *****************************************************************************/
   7
   8 /*
   9  * Copyright (C) 2000 - 2008, Intel Corp.
  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 "accommon.h"
  47 #include "acdispat.h"
  48 #include "acinterp.h"
  49 #include "acnamesp.h"
  50
  51 #define _COMPONENT          ACPI_EXECUTER
  52 ACPI_MODULE_NAME("exresnte")
  53
  54 /*******************************************************************************
  55  *
  56  * FUNCTION:    acpi_ex_resolve_node_to_value
  57  *
  58  * PARAMETERS:  object_ptr      - Pointer to a location that contains
  59  *                                a pointer to a NS node, and will receive a
  60  *                                pointer to the resolved object.
  61  *              walk_state      - Current state.  Valid only if executing AML
  62  *                                code.  NULL if simply resolving an object
  63  *
  64  * RETURN:      Status
  65  *
  66  * DESCRIPTION: Resolve a Namespace node to a valued object
  67  *
  68  * Note: for some of the data types, the pointer attached to the Node
  69  * can be either a pointer to an actual internal object or a pointer into the
  70  * AML stream itself.  These types are currently:
  71  *
  72  *      ACPI_TYPE_INTEGER
  73  *      ACPI_TYPE_STRING
  74  *      ACPI_TYPE_BUFFER
  75  *      ACPI_TYPE_MUTEX
  76  *      ACPI_TYPE_PACKAGE
  77  *
  78  ******************************************************************************/
  79 acpi_status
  80 acpi_ex_resolve_node_to_value(struct acpi_namespace_node **object_ptr,
  81                               struct acpi_walk_state *walk_state)
  82 {
  83         acpi_status status = AE_OK;
  84         union acpi_operand_object *source_desc;
  85         union acpi_operand_object *obj_desc = NULL;
  86         struct acpi_namespace_node *node;
  87         acpi_object_type entry_type;
  88
  89         ACPI_FUNCTION_TRACE(ex_resolve_node_to_value);
  90
  91         /*
  92          * The stack pointer points to a struct acpi_namespace_node (Node).  Get the
  93          * object that is attached to the Node.
  94          */
  95         node = *object_ptr;
  96         source_desc = acpi_ns_get_attached_object(node);
  97         entry_type = acpi_ns_get_type((acpi_handle) node);
  98
  99         ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Entry=%p SourceDesc=%p [%s]\n",
 100                           node, source_desc,
 101                           acpi_ut_get_type_name(entry_type)));
 102
 103         if ((entry_type == ACPI_TYPE_LOCAL_ALIAS) ||
 104             (entry_type == ACPI_TYPE_LOCAL_METHOD_ALIAS)) {
 105
 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) Device/Thermal objects don't have a "real" subobject, return the Node
 117          * 2) Method locals and arguments have a pseudo-Node
 118          * 3) 10/2007: Added method type to assist with Package construction.
 119          */
 120         if ((entry_type == ACPI_TYPE_DEVICE) ||
 121             (entry_type == ACPI_TYPE_THERMAL) ||
 122             (entry_type == ACPI_TYPE_METHOD) ||
 123             (node->flags & (ANOBJ_METHOD_ARG | ANOBJ_METHOD_LOCAL))) {
 124                 return_ACPI_STATUS(AE_OK);
 125         }
 126
 127         if (!source_desc) {
 128                 ACPI_ERROR((AE_INFO, "No object attached to node %p", node));
 129                 return_ACPI_STATUS(AE_AML_NO_OPERAND);
 130         }
 131
 132         /*
 133          * Action is based on the type of the Node, which indicates the type
 134          * of the attached object or pointer
 135          */
 136         switch (entry_type) {
 137         case ACPI_TYPE_PACKAGE:
 138
 139                 if (source_desc->common.type != ACPI_TYPE_PACKAGE) {
 140                         ACPI_ERROR((AE_INFO, "Object not a Package, type %s",
 141                                     acpi_ut_get_object_type_name(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
 148                         /* Return an additional reference to the object */
 149
 150                         obj_desc = source_desc;
 151                         acpi_ut_add_reference(obj_desc);
 152                 }
 153                 break;
 154
 155         case ACPI_TYPE_BUFFER:
 156
 157                 if (source_desc->common.type != ACPI_TYPE_BUFFER) {
 158                         ACPI_ERROR((AE_INFO, "Object not a Buffer, type %s",
 159                                     acpi_ut_get_object_type_name(source_desc)));
 160                         return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 161                 }
 162
 163                 status = acpi_ds_get_buffer_arguments(source_desc);
 164                 if (ACPI_SUCCESS(status)) {
 165
 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 (source_desc->common.type != ACPI_TYPE_STRING) {
 176                         ACPI_ERROR((AE_INFO, "Object not a String, type %s",
 177                                     acpi_ut_get_object_type_name(source_desc)));
 178                         return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 179                 }
 180
 181                 /* Return an additional reference to the object */
 182
 183                 obj_desc = source_desc;
 184                 acpi_ut_add_reference(obj_desc);
 185                 break;
 186
 187         case ACPI_TYPE_INTEGER:
 188
 189                 if (source_desc->common.type != ACPI_TYPE_INTEGER) {
 190                         ACPI_ERROR((AE_INFO, "Object not a Integer, type %s",
 191                                     acpi_ut_get_object_type_name(source_desc)));
 192                         return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 193                 }
 194
 195                 /* Return an additional reference to the object */
 196
 197                 obj_desc = source_desc;
 198                 acpi_ut_add_reference(obj_desc);
 199                 break;
 200
 201         case ACPI_TYPE_BUFFER_FIELD:
 202         case ACPI_TYPE_LOCAL_REGION_FIELD:
 203         case ACPI_TYPE_LOCAL_BANK_FIELD:
 204         case ACPI_TYPE_LOCAL_INDEX_FIELD:
 205
 206                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 207                                   "FieldRead Node=%p SourceDesc=%p Type=%X\n",
 208                                   node, source_desc, entry_type));
 209
 210                 status =
 211                     acpi_ex_read_data_from_field(walk_state, source_desc,
 212                                                  &obj_desc);
 213                 break;
 214
 215                 /* For these objects, just return the object attached to the Node */
 216
 217         case ACPI_TYPE_MUTEX:
 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.class) {
 241                 case ACPI_REFCLASS_TABLE:       /* This is a ddb_handle */
 242                 case ACPI_REFCLASS_REFOF:
 243                 case ACPI_REFCLASS_INDEX:
 244
 245                         /* Return an additional reference to the object */
 246
 247                         obj_desc = source_desc;
 248                         acpi_ut_add_reference(obj_desc);
 249                         break;
 250
 251                 default:
 252                         /* No named references are allowed here */
 253
 254                         ACPI_ERROR((AE_INFO,
 255                                     "Unsupported Reference type %X",
 256                                     source_desc->reference.class));
 257
 258                         return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 259                 }
 260                 break;
 261
 262         default:
 263
 264                 /* Default case is for unknown types */
 265
 266                 ACPI_ERROR((AE_INFO,
 267                             "Node %p - Unknown object type %X",
 268                             node, entry_type));
 269
 270                 return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 271
 272         }                       /* switch (entry_type) */
 273
 274         /* Return the object descriptor */
 275
 276         *object_ptr = (void *)obj_desc;
 277         return_ACPI_STATUS(status);
 278 }