drivers/acpi/acpica/exresnte.c

   1 /******************************************************************************
   2  *
   3  * Module Name: exresnte - AML Interpreter object resolution
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2015, 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 [%4.4s] %p",
 128                             node->name.ascii, 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
 253                         /* No named references are allowed here */
 254
 255                         ACPI_ERROR((AE_INFO,
 256                                     "Unsupported Reference type 0x%X",
 257                                     source_desc->reference.class));
 258
 259                         return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 260                 }
 261                 break;
 262
 263         default:
 264
 265                 /* Default case is for unknown types */
 266
 267                 ACPI_ERROR((AE_INFO,
 268                             "Node %p - Unknown object type 0x%X",
 269                             node, entry_type));
 270
 271                 return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 272
 273         }                       /* switch (entry_type) */
 274
 275         /* Return the object descriptor */
 276
 277         *object_ptr = (void *)obj_desc;
 278         return_ACPI_STATUS(status);
 279 }