Linux 2.6.20.7

[linux/fpc-iii.git] / drivers / acpi / executer / exstore.c

/******************************************************************************
 *
 * Module Name: exstore - AML Interpreter object store support
 *
 *****************************************************************************/

/*
 * Copyright (C) 2000 - 2006, R. Byron Moore
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions, and the following disclaimer,
 *    without modification.
 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
 *    substantially similar to the "NO WARRANTY" disclaimer below
 *    ("Disclaimer") and any redistribution must be conditioned upon
 *    including a substantially similar Disclaimer requirement for further
 *    binary redistribution.
 * 3. Neither the names of the above-listed copyright holders nor the names
 *    of any contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * Alternatively, this software may be distributed under the terms of the
 * GNU General Public License ("GPL") version 2 as published by the Free
 * Software Foundation.
 *
 * NO WARRANTY
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGES.
 */

#include <acpi/acpi.h>
#include <acpi/acdispat.h>
#include <acpi/acinterp.h>
#include <acpi/amlcode.h>
#include <acpi/acnamesp.h>
#include <acpi/acparser.h>

#define _COMPONENT          ACPI_EXECUTER
ACPI_MODULE_NAME("exstore")

/* Local prototypes */
static void
acpi_ex_do_debug_object(union acpi_operand_object *source_desc,
                        u32 level, u32 index);

static acpi_status
acpi_ex_store_object_to_index(union acpi_operand_object *val_desc,
                              union acpi_operand_object *dest_desc,
                              struct acpi_walk_state *walk_state);

/*******************************************************************************
 *
 * FUNCTION:    acpi_ex_do_debug_object
 *
 * PARAMETERS:  source_desc         - Value to be stored
 *              Level               - Indentation level (used for packages)
 *              Index               - Current package element, zero if not pkg
 *
 * RETURN:      None
 *
 * DESCRIPTION: Handles stores to the Debug Object.
 *
 ******************************************************************************/

static void
acpi_ex_do_debug_object(union acpi_operand_object *source_desc,
                        u32 level, u32 index)
{
        u32 i;

        ACPI_FUNCTION_TRACE_PTR(ex_do_debug_object, source_desc);

        ACPI_DEBUG_PRINT_RAW((ACPI_DB_DEBUG_OBJECT, "[ACPI Debug] %*s",
                              level, " "));

        /* Display index for package output only */

        if (index > 0) {
                ACPI_DEBUG_PRINT_RAW((ACPI_DB_DEBUG_OBJECT,
                                      "(%.2u) ", index - 1));
        }

        if (!source_desc) {
                ACPI_DEBUG_PRINT_RAW((ACPI_DB_DEBUG_OBJECT, "<Null Object>\n"));
                return_VOID;
        }

        if (ACPI_GET_DESCRIPTOR_TYPE(source_desc) == ACPI_DESC_TYPE_OPERAND) {
                ACPI_DEBUG_PRINT_RAW((ACPI_DB_DEBUG_OBJECT, "%s: ",
                                      acpi_ut_get_object_type_name
                                      (source_desc)));

                if (!acpi_ut_valid_internal_object(source_desc)) {
                        ACPI_DEBUG_PRINT_RAW((ACPI_DB_DEBUG_OBJECT,
                                              "%p, Invalid Internal Object!\n",
                                              source_desc));
                        return_VOID;
                }
        } else if (ACPI_GET_DESCRIPTOR_TYPE(source_desc) ==
                   ACPI_DESC_TYPE_NAMED) {
                ACPI_DEBUG_PRINT_RAW((ACPI_DB_DEBUG_OBJECT, "%s: %p\n",
                                      acpi_ut_get_type_name(((struct
                                                              acpi_namespace_node
                                                              *)source_desc)->
                                                            type),
                                      source_desc));
                return_VOID;
        } else {
                return_VOID;
        }

        switch (ACPI_GET_OBJECT_TYPE(source_desc)) {
        case ACPI_TYPE_INTEGER:

                /* Output correct integer width */

                if (acpi_gbl_integer_byte_width == 4) {
                        ACPI_DEBUG_PRINT_RAW((ACPI_DB_DEBUG_OBJECT, "0x%8.8X\n",
                                              (u32) source_desc->integer.
                                              value));
                } else {
                        ACPI_DEBUG_PRINT_RAW((ACPI_DB_DEBUG_OBJECT,
                                              "0x%8.8X%8.8X\n",
                                              ACPI_FORMAT_UINT64(source_desc->
                                                                 integer.
                                                                 value)));
                }
                break;

        case ACPI_TYPE_BUFFER:

                ACPI_DEBUG_PRINT_RAW((ACPI_DB_DEBUG_OBJECT, "[0x%.2X]\n",
                                      (u32) source_desc->buffer.length));
                ACPI_DUMP_BUFFER(source_desc->buffer.pointer,
                                 (source_desc->buffer.length <
                                  32) ? source_desc->buffer.length : 32);
                break;

        case ACPI_TYPE_STRING:

                ACPI_DEBUG_PRINT_RAW((ACPI_DB_DEBUG_OBJECT, "[0x%.2X] \"%s\"\n",
                                      source_desc->string.length,
                                      source_desc->string.pointer));
                break;

        case ACPI_TYPE_PACKAGE:

                ACPI_DEBUG_PRINT_RAW((ACPI_DB_DEBUG_OBJECT,
                                      "[0x%.2X Elements]\n",
                                      source_desc->package.count));

                /* Output the entire contents of the package */

                for (i = 0; i < source_desc->package.count; i++) {
                        acpi_ex_do_debug_object(source_desc->package.
                                                elements[i], level + 4, i + 1);
                }
                break;

        case ACPI_TYPE_LOCAL_REFERENCE:

                if (source_desc->reference.opcode == AML_INDEX_OP) {
                        ACPI_DEBUG_PRINT_RAW((ACPI_DB_DEBUG_OBJECT,
                                              "[%s, 0x%X]\n",
                                              acpi_ps_get_opcode_name
                                              (source_desc->reference.opcode),
                                              source_desc->reference.offset));
                } else {
                        ACPI_DEBUG_PRINT_RAW((ACPI_DB_DEBUG_OBJECT, "[%s]\n",
                                              acpi_ps_get_opcode_name
                                              (source_desc->reference.opcode)));
                }

                if (source_desc->reference.object) {
                        if (ACPI_GET_DESCRIPTOR_TYPE
                            (source_desc->reference.object) ==
                            ACPI_DESC_TYPE_NAMED) {
                                acpi_ex_do_debug_object(((struct
                                                          acpi_namespace_node *)
                                                         source_desc->reference.
                                                         object)->object,
                                                        level + 4, 0);
                        } else {
                                acpi_ex_do_debug_object(source_desc->reference.
                                                        object, level + 4, 0);
                        }
                } else if (source_desc->reference.node) {
                        acpi_ex_do_debug_object((source_desc->reference.node)->
                                                object, level + 4, 0);
                }
                break;

        default:

                ACPI_DEBUG_PRINT_RAW((ACPI_DB_DEBUG_OBJECT, "%p %s\n",
                                      source_desc,
                                      acpi_ut_get_object_type_name
                                      (source_desc)));
                break;
        }

        ACPI_DEBUG_PRINT_RAW((ACPI_DB_EXEC, "\n"));
        return_VOID;
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ex_store
 *
 * PARAMETERS:  *source_desc        - Value to be stored
 *              *dest_desc          - Where to store it.  Must be an NS node
 *                                    or an union acpi_operand_object of type
 *                                    Reference;
 *              walk_state          - Current walk state
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Store the value described by source_desc into the location
 *              described by dest_desc. Called by various interpreter
 *              functions to store the result of an operation into
 *              the destination operand -- not just simply the actual "Store"
 *              ASL operator.
 *
 ******************************************************************************/

acpi_status
acpi_ex_store(union acpi_operand_object *source_desc,
              union acpi_operand_object *dest_desc,
              struct acpi_walk_state *walk_state)
{
        acpi_status status = AE_OK;
        union acpi_operand_object *ref_desc = dest_desc;

        ACPI_FUNCTION_TRACE_PTR(ex_store, dest_desc);

        /* Validate parameters */

        if (!source_desc || !dest_desc) {
                ACPI_ERROR((AE_INFO, "Null parameter"));
                return_ACPI_STATUS(AE_AML_NO_OPERAND);
        }

        /* dest_desc can be either a namespace node or an ACPI object */

        if (ACPI_GET_DESCRIPTOR_TYPE(dest_desc) == ACPI_DESC_TYPE_NAMED) {
                /*
                 * Dest is a namespace node,
                 * Storing an object into a Named node.
                 */
                status = acpi_ex_store_object_to_node(source_desc,
                                                      (struct
                                                       acpi_namespace_node *)
                                                      dest_desc, walk_state,
                                                      ACPI_IMPLICIT_CONVERSION);

                return_ACPI_STATUS(status);
        }

        /* Destination object must be a Reference or a Constant object */

        switch (ACPI_GET_OBJECT_TYPE(dest_desc)) {
        case ACPI_TYPE_LOCAL_REFERENCE:
                break;

        case ACPI_TYPE_INTEGER:

                /* Allow stores to Constants -- a Noop as per ACPI spec */

                if (dest_desc->common.flags & AOPOBJ_AML_CONSTANT) {
                        return_ACPI_STATUS(AE_OK);
                }

                /*lint -fallthrough */

        default:

                /* Destination is not a Reference object */

                ACPI_ERROR((AE_INFO,
                            "Target is not a Reference or Constant object - %s [%p]",
                            acpi_ut_get_object_type_name(dest_desc),
                            dest_desc));

                ACPI_DUMP_STACK_ENTRY(source_desc);
                ACPI_DUMP_STACK_ENTRY(dest_desc);
                ACPI_DUMP_OPERANDS(&dest_desc, ACPI_IMODE_EXECUTE, "ExStore",
                                   2,
                                   "Target is not a Reference or Constant object");

                return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
        }

        /*
         * Examine the Reference opcode.  These cases are handled:
         *
         * 1) Store to Name (Change the object associated with a name)
         * 2) Store to an indexed area of a Buffer or Package
         * 3) Store to a Method Local or Arg
         * 4) Store to the debug object
         */
        switch (ref_desc->reference.opcode) {
        case AML_NAME_OP:
        case AML_REF_OF_OP:

                /* Storing an object into a Name "container" */

                status = acpi_ex_store_object_to_node(source_desc,
                                                      ref_desc->reference.
                                                      object, walk_state,
                                                      ACPI_IMPLICIT_CONVERSION);
                break;

        case AML_INDEX_OP:

                /* Storing to an Index (pointer into a packager or buffer) */

                status =
                    acpi_ex_store_object_to_index(source_desc, ref_desc,
                                                  walk_state);
                break;

        case AML_LOCAL_OP:
        case AML_ARG_OP:

                /* Store to a method local/arg  */

                status =
                    acpi_ds_store_object_to_local(ref_desc->reference.opcode,
                                                  ref_desc->reference.offset,
                                                  source_desc, walk_state);
                break;

        case AML_DEBUG_OP:

                /*
                 * Storing to the Debug object causes the value stored to be
                 * displayed and otherwise has no effect -- see ACPI Specification
                 */
                ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
                                  "**** Write to Debug Object: Object %p %s ****:\n\n",
                                  source_desc,
                                  acpi_ut_get_object_type_name(source_desc)));

                acpi_ex_do_debug_object(source_desc, 0, 0);
                break;

        default:

                ACPI_ERROR((AE_INFO, "Unknown Reference opcode %X",
                            ref_desc->reference.opcode));
                ACPI_DUMP_ENTRY(ref_desc, ACPI_LV_ERROR);

                status = AE_AML_INTERNAL;
                break;
        }

        return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ex_store_object_to_index
 *
 * PARAMETERS:  *source_desc            - Value to be stored
 *              *dest_desc              - Named object to receive the value
 *              walk_state              - Current walk state
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Store the object to indexed Buffer or Package element
 *
 ******************************************************************************/

static acpi_status
acpi_ex_store_object_to_index(union acpi_operand_object *source_desc,
                              union acpi_operand_object *index_desc,
                              struct acpi_walk_state *walk_state)
{
        acpi_status status = AE_OK;
        union acpi_operand_object *obj_desc;
        union acpi_operand_object *new_desc;
        u8 value = 0;
        u32 i;

        ACPI_FUNCTION_TRACE(ex_store_object_to_index);

        /*
         * Destination must be a reference pointer, and
         * must point to either a buffer or a package
         */
        switch (index_desc->reference.target_type) {
        case ACPI_TYPE_PACKAGE:
                /*
                 * Storing to a package element. Copy the object and replace
                 * any existing object with the new object. No implicit
                 * conversion is performed.
                 *
                 * The object at *(index_desc->Reference.Where) is the
                 * element within the package that is to be modified.
                 * The parent package object is at index_desc->Reference.Object
                 */
                obj_desc = *(index_desc->reference.where);

                status =
                    acpi_ut_copy_iobject_to_iobject(source_desc, &new_desc,
                                                    walk_state);
                if (ACPI_FAILURE(status)) {
                        return_ACPI_STATUS(status);
                }

                if (obj_desc) {

                        /* Decrement reference count by the ref count of the parent package */

                        for (i = 0; i < ((union acpi_operand_object *)
                                         index_desc->reference.object)->common.
                             reference_count; i++) {
                                acpi_ut_remove_reference(obj_desc);
                        }
                }

                *(index_desc->reference.where) = new_desc;

                /* Increment ref count by the ref count of the parent package-1 */

                for (i = 1; i < ((union acpi_operand_object *)
                                 index_desc->reference.object)->common.
                     reference_count; i++) {
                        acpi_ut_add_reference(new_desc);
                }

                break;

        case ACPI_TYPE_BUFFER_FIELD:

                /*
                 * Store into a Buffer or String (not actually a real buffer_field)
                 * at a location defined by an Index.
                 *
                 * The first 8-bit element of the source object is written to the
                 * 8-bit Buffer location defined by the Index destination object,
                 * according to the ACPI 2.0 specification.
                 */

                /*
                 * Make sure the target is a Buffer or String. An error should
                 * not happen here, since the reference_object was constructed
                 * by the INDEX_OP code.
                 */
                obj_desc = index_desc->reference.object;
                if ((ACPI_GET_OBJECT_TYPE(obj_desc) != ACPI_TYPE_BUFFER) &&
                    (ACPI_GET_OBJECT_TYPE(obj_desc) != ACPI_TYPE_STRING)) {
                        return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
                }

                /*
                 * The assignment of the individual elements will be slightly
                 * different for each source type.
                 */
                switch (ACPI_GET_OBJECT_TYPE(source_desc)) {
                case ACPI_TYPE_INTEGER:

                        /* Use the least-significant byte of the integer */

                        value = (u8) (source_desc->integer.value);
                        break;

                case ACPI_TYPE_BUFFER:
                case ACPI_TYPE_STRING:

                        /* Note: Takes advantage of common string/buffer fields */

                        value = source_desc->buffer.pointer[0];
                        break;

                default:

                        /* All other types are invalid */

                        ACPI_ERROR((AE_INFO,
                                    "Source must be Integer/Buffer/String type, not %s",
                                    acpi_ut_get_object_type_name(source_desc)));
                        return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
                }

                /* Store the source value into the target buffer byte */

                obj_desc->buffer.pointer[index_desc->reference.offset] = value;
                break;

        default:
                ACPI_ERROR((AE_INFO, "Target is not a Package or BufferField"));
                status = AE_AML_OPERAND_TYPE;
                break;
        }

        return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ex_store_object_to_node
 *
 * PARAMETERS:  source_desc             - Value to be stored
 *              Node                    - Named object to receive the value
 *              walk_state              - Current walk state
 *              implicit_conversion     - Perform implicit conversion (yes/no)
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Store the object to the named object.
 *
 *              The Assignment of an object to a named object is handled here
 *              The value passed in will replace the current value (if any)
 *              with the input value.
 *
 *              When storing into an object the data is converted to the
 *              target object type then stored in the object.  This means
 *              that the target object type (for an initialized target) will
 *              not be changed by a store operation.
 *
 *              Assumes parameters are already validated.
 *
 ******************************************************************************/

acpi_status
acpi_ex_store_object_to_node(union acpi_operand_object *source_desc,
                             struct acpi_namespace_node *node,
                             struct acpi_walk_state *walk_state,
                             u8 implicit_conversion)
{
        acpi_status status = AE_OK;
        union acpi_operand_object *target_desc;
        union acpi_operand_object *new_desc;
        acpi_object_type target_type;

        ACPI_FUNCTION_TRACE_PTR(ex_store_object_to_node, source_desc);

        /* Get current type of the node, and object attached to Node */

        target_type = acpi_ns_get_type(node);
        target_desc = acpi_ns_get_attached_object(node);

        ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Storing %p(%s) into node %p(%s)\n",
                          source_desc,
                          acpi_ut_get_object_type_name(source_desc), node,
                          acpi_ut_get_type_name(target_type)));

        /*
         * Resolve the source object to an actual value
         * (If it is a reference object)
         */
        status = acpi_ex_resolve_object(&source_desc, target_type, walk_state);
        if (ACPI_FAILURE(status)) {
                return_ACPI_STATUS(status);
        }

        /* If no implicit conversion, drop into the default case below */

        if ((!implicit_conversion) || (walk_state->opcode == AML_COPY_OP)) {

                /* Force execution of default (no implicit conversion) */

                target_type = ACPI_TYPE_ANY;
        }

        /* Do the actual store operation */

        switch (target_type) {
        case ACPI_TYPE_BUFFER_FIELD:
        case ACPI_TYPE_LOCAL_REGION_FIELD:
        case ACPI_TYPE_LOCAL_BANK_FIELD:
        case ACPI_TYPE_LOCAL_INDEX_FIELD:

                /* For fields, copy the source data to the target field. */

                status = acpi_ex_write_data_to_field(source_desc, target_desc,
                                                     &walk_state->result_obj);
                break;

        case ACPI_TYPE_INTEGER:
        case ACPI_TYPE_STRING:
        case ACPI_TYPE_BUFFER:

                /*
                 * These target types are all of type Integer/String/Buffer, and
                 * therefore support implicit conversion before the store.
                 *
                 * Copy and/or convert the source object to a new target object
                 */
                status =
                    acpi_ex_store_object_to_object(source_desc, target_desc,
                                                   &new_desc, walk_state);
                if (ACPI_FAILURE(status)) {
                        return_ACPI_STATUS(status);
                }

                if (new_desc != target_desc) {
                        /*
                         * Store the new new_desc as the new value of the Name, and set
                         * the Name's type to that of the value being stored in it.
                         * source_desc reference count is incremented by attach_object.
                         *
                         * Note: This may change the type of the node if an explicit store
                         * has been performed such that the node/object type has been
                         * changed.
                         */
                        status =
                            acpi_ns_attach_object(node, new_desc,
                                                  new_desc->common.type);

                        ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
                                          "Store %s into %s via Convert/Attach\n",
                                          acpi_ut_get_object_type_name
                                          (source_desc),
                                          acpi_ut_get_object_type_name
                                          (new_desc)));
                }
                break;

        default:

                ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
                                  "Storing %s (%p) directly into node (%p) with no implicit conversion\n",
                                  acpi_ut_get_object_type_name(source_desc),
                                  source_desc, node));

                /* No conversions for all other types.  Just attach the source object */

                status = acpi_ns_attach_object(node, source_desc,
                                               ACPI_GET_OBJECT_TYPE
                                               (source_desc));
                break;
        }

        return_ACPI_STATUS(status);
}