LXR linux/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
  51ACPI_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 ******************************************************************************/
  78acpi_status
  79acpi_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}
 280