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/******************************************************************************

 *

 * Module Name: utobject - ACPI object create/delete/size/cache routines

 *

 *****************************************************************************/

/*

 * Copyright (C) 2000 - 2007, 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/acnamesp.h>

#include <acpi/amlcode.h>

#define _COMPONENT          ACPI_UTILITIES

ACPI_MODULE_NAME("utobject")

/* Local prototypes */

static acpi_status

acpi_ut_get_simple_object_size(union acpi_operand_object *obj,

                               acpi_size * obj_length);

static acpi_status

acpi_ut_get_package_object_size(union acpi_operand_object *obj,

                                acpi_size * obj_length);

static acpi_status

acpi_ut_get_element_length(u8 object_type,

                           union acpi_operand_object *source_object,

                           union acpi_generic_state *state, void *context);

/*******************************************************************************

 *

 * FUNCTION:    acpi_ut_create_internal_object_dbg

 *

 * PARAMETERS:  module_name         - Source file name of caller

 *              line_number         - Line number of caller

 *              component_id        - Component type of caller

 *              Type                - ACPI Type of the new object

 *

 * RETURN:      A new internal object, null on failure

 *

 * DESCRIPTION: Create and initialize a new internal object.

 *

 * NOTE:        We always allocate the worst-case object descriptor because

 *              these objects are cached, and we want them to be

 *              one-size-satisifies-any-request.  This in itself may not be

 *              the most memory efficient, but the efficiency of the object

 *              cache should more than make up for this!

 *

 ******************************************************************************/

union acpi_operand_object *acpi_ut_create_internal_object_dbg(char *module_name,

                                                              u32 line_number,

                                                              u32 component_id,

                                                              acpi_object_type

                                                              type)

{

        union acpi_operand_object *object;

        union acpi_operand_object *second_object;

        ACPI_FUNCTION_TRACE_STR(ut_create_internal_object_dbg,

                                acpi_ut_get_type_name(type));

        /* Allocate the raw object descriptor */

        object =

            acpi_ut_allocate_object_desc_dbg(module_name, line_number,

                                             component_id);

        if (!object) {

                return_PTR(NULL);

        }

        switch (type) {

        case ACPI_TYPE_REGION:

        case ACPI_TYPE_BUFFER_FIELD:

                /* These types require a secondary object */

                second_object = acpi_ut_allocate_object_desc_dbg(module_name,

                                                                 line_number,

                                                                 component_id);

                if (!second_object) {

                        acpi_ut_delete_object_desc(object);

                        return_PTR(NULL);

                }

                second_object->common.type = ACPI_TYPE_LOCAL_EXTRA;

                second_object->common.reference_count = 1;

                /* Link the second object to the first */

                object->common.next_object = second_object;

                break;

        default:

                /* All others have no secondary object */

                break;

        }

        /* Save the object type in the object descriptor */

        object->common.type = (u8) type;

        /* Init the reference count */

        object->common.reference_count = 1;

        /* Any per-type initialization should go here */

        return_PTR(object);

}

/*******************************************************************************

 *

 * FUNCTION:    acpi_ut_create_package_object

 *

 * PARAMETERS:  Count               - Number of package elements

 *

 * RETURN:      Pointer to a new Package object, null on failure

 *

 * DESCRIPTION: Create a fully initialized package object

 *

 ******************************************************************************/

union acpi_operand_object *acpi_ut_create_package_object(u32 count)

{

        union acpi_operand_object *package_desc;

        union acpi_operand_object **package_elements;

        ACPI_FUNCTION_TRACE_U32(ut_create_package_object, count);

        /* Create a new Package object */

        package_desc = acpi_ut_create_internal_object(ACPI_TYPE_PACKAGE);

        if (!package_desc) {

                return_PTR(NULL);

        }

        /*

         * Create the element array. Count+1 allows the array to be null

         * terminated.

         */

        package_elements = ACPI_ALLOCATE_ZEROED((acpi_size)

                                                (count + 1) * sizeof(void *));

        if (!package_elements) {

                acpi_ut_remove_reference(package_desc);

                return_PTR(NULL);

        }

        package_desc->package.count = count;

        package_desc->package.elements = package_elements;

        return_PTR(package_desc);

}

/*******************************************************************************

 *

 * FUNCTION:    acpi_ut_create_buffer_object

 *

 * PARAMETERS:  buffer_size            - Size of buffer to be created

 *

 * RETURN:      Pointer to a new Buffer object, null on failure

 *

 * DESCRIPTION: Create a fully initialized buffer object

 *

 ******************************************************************************/

union acpi_operand_object *acpi_ut_create_buffer_object(acpi_size buffer_size)

{

        union acpi_operand_object *buffer_desc;

        u8 *buffer = NULL;

        ACPI_FUNCTION_TRACE_U32(ut_create_buffer_object, buffer_size);

        /* Create a new Buffer object */

        buffer_desc = acpi_ut_create_internal_object(ACPI_TYPE_BUFFER);

        if (!buffer_desc) {

                return_PTR(NULL);

        }

        /* Create an actual buffer only if size > 0 */

        if (buffer_size > 0) {

                /* Allocate the actual buffer */

                buffer = ACPI_ALLOCATE_ZEROED(buffer_size);

                if (!buffer) {

                        ACPI_ERROR((AE_INFO, "Could not allocate size %X",

                                    (u32) buffer_size));

                        acpi_ut_remove_reference(buffer_desc);

                        return_PTR(NULL);

                }

        }

        /* Complete buffer object initialization */

        buffer_desc->buffer.flags |= AOPOBJ_DATA_VALID;

        buffer_desc->buffer.pointer = buffer;

        buffer_desc->buffer.length = (u32) buffer_size;

        /* Return the new buffer descriptor */

        return_PTR(buffer_desc);

}

/*******************************************************************************

 *

 * FUNCTION:    acpi_ut_create_string_object

 *

 * PARAMETERS:  string_size         - Size of string to be created. Does not

 *                                    include NULL terminator, this is added

 *                                    automatically.

 *

 * RETURN:      Pointer to a new String object

 *

 * DESCRIPTION: Create a fully initialized string object

 *

 ******************************************************************************/

union acpi_operand_object *acpi_ut_create_string_object(acpi_size string_size)

{

        union acpi_operand_object *string_desc;

        char *string;

        ACPI_FUNCTION_TRACE_U32(ut_create_string_object, string_size);

        /* Create a new String object */

        string_desc = acpi_ut_create_internal_object(ACPI_TYPE_STRING);

        if (!string_desc) {

                return_PTR(NULL);

        }

        /*

         * Allocate the actual string buffer -- (Size + 1) for NULL terminator.

         * NOTE: Zero-length strings are NULL terminated

         */

        string = ACPI_ALLOCATE_ZEROED(string_size + 1);

        if (!string) {

                ACPI_ERROR((AE_INFO, "Could not allocate size %X",

                            (u32) string_size));

                acpi_ut_remove_reference(string_desc);

                return_PTR(NULL);

        }

        /* Complete string object initialization */

        string_desc->string.pointer = string;

        string_desc->string.length = (u32) string_size;

        /* Return the new string descriptor */

        return_PTR(string_desc);

}

/*******************************************************************************

 *

 * FUNCTION:    acpi_ut_valid_internal_object

 *

 * PARAMETERS:  Object              - Object to be validated

 *

 * RETURN:      TRUE if object is valid, FALSE otherwise

 *

 * DESCRIPTION: Validate a pointer to be an union acpi_operand_object

 *

 ******************************************************************************/

u8 acpi_ut_valid_internal_object(void *object)

{

        ACPI_FUNCTION_NAME(ut_valid_internal_object);

        /* Check for a null pointer */

        if (!object) {

                ACPI_DEBUG_PRINT((ACPI_DB_INFO, "**** Null Object Ptr\n"));

                return (FALSE);

        }

        /* Check the descriptor type field */

        switch (ACPI_GET_DESCRIPTOR_TYPE(object)) {

        case ACPI_DESC_TYPE_OPERAND:

                /* The object appears to be a valid union acpi_operand_object    */

                return (TRUE);

        default:

                ACPI_DEBUG_PRINT((ACPI_DB_INFO,

                                  "%p is not not an ACPI operand obj [%s]\n",

                                  object, acpi_ut_get_descriptor_name(object)));

                break;

        }

        return (FALSE);

}

/*******************************************************************************

 *

 * FUNCTION:    acpi_ut_allocate_object_desc_dbg

 *

 * PARAMETERS:  module_name         - Caller's module name (for error output)

 *              line_number         - Caller's line number (for error output)

 *              component_id        - Caller's component ID (for error output)

 *

 * RETURN:      Pointer to newly allocated object descriptor.  Null on error

 *

 * DESCRIPTION: Allocate a new object descriptor.  Gracefully handle

 *              error conditions.

 *

 ******************************************************************************/

void *acpi_ut_allocate_object_desc_dbg(char *module_name,

                                       u32 line_number, u32 component_id)

{

        union acpi_operand_object *object;

        ACPI_FUNCTION_TRACE(ut_allocate_object_desc_dbg);

        object = acpi_os_acquire_object(acpi_gbl_operand_cache);

        if (!object) {

                ACPI_ERROR((module_name, line_number,

                            "Could not allocate an object descriptor"));

                return_PTR(NULL);

        }

        /* Mark the descriptor type */

        memset(object, 0, sizeof(union acpi_operand_object));

        ACPI_SET_DESCRIPTOR_TYPE(object, ACPI_DESC_TYPE_OPERAND);

        ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS, "%p Size %X\n",

                          object, (u32) sizeof(union acpi_operand_object)));

        return_PTR(object);

}

/*******************************************************************************

 *

 * FUNCTION:    acpi_ut_delete_object_desc

 *

 * PARAMETERS:  Object          - An Acpi internal object to be deleted

 *

 * RETURN:      None.

 *

 * DESCRIPTION: Free an ACPI object descriptor or add it to the object cache

 *

 ******************************************************************************/

void acpi_ut_delete_object_desc(union acpi_operand_object *object)

{

        ACPI_FUNCTION_TRACE_PTR(ut_delete_object_desc, object);

        /* Object must be an union acpi_operand_object    */

        if (ACPI_GET_DESCRIPTOR_TYPE(object) != ACPI_DESC_TYPE_OPERAND) {

                ACPI_ERROR((AE_INFO,

                            "%p is not an ACPI Operand object [%s]", object,

                            acpi_ut_get_descriptor_name(object)));

                return_VOID;

        }

        (void)acpi_os_release_object(acpi_gbl_operand_cache, object);

        return_VOID;

}

/*******************************************************************************

 *

 * FUNCTION:    acpi_ut_get_simple_object_size

 *

 * PARAMETERS:  internal_object    - An ACPI operand object

 *              obj_length         - Where the length is returned

 *

 * RETURN:      Status

 *

 * DESCRIPTION: This function is called to determine the space required to

 *              contain a simple object for return to an external user.

 *

 *              The length includes the object structure plus any additional

 *              needed space.

 *

 ******************************************************************************/

static acpi_status

acpi_ut_get_simple_object_size(union acpi_operand_object *internal_object,

                               acpi_size * obj_length)

{

        acpi_size length;

        acpi_status status = AE_OK;

        ACPI_FUNCTION_TRACE_PTR(ut_get_simple_object_size, internal_object);

        /*

         * Handle a null object (Could be a uninitialized package

         * element -- which is legal)

         */

        if (!internal_object) {

                *obj_length = 0;

                return_ACPI_STATUS(AE_OK);

        }

        /* Start with the length of the Acpi object */

        length = sizeof(union acpi_object);

        if (ACPI_GET_DESCRIPTOR_TYPE(internal_object) == ACPI_DESC_TYPE_NAMED) {

                /* Object is a named object (reference), just return the length */

                *obj_length = ACPI_ROUND_UP_TO_NATIVE_WORD(length);

                return_ACPI_STATUS(status);

        }

        /*

         * The final length depends on the object type

         * Strings and Buffers are packed right up against the parent object and

         * must be accessed bytewise or there may be alignment problems on

         * certain processors

         */

        switch (ACPI_GET_OBJECT_TYPE(internal_object)) {

        case ACPI_TYPE_STRING:

                length += (acpi_size) internal_object->string.length + 1;

                break;

        case ACPI_TYPE_BUFFER:

                length += (acpi_size) internal_object->buffer.length;

                break;

        case ACPI_TYPE_INTEGER:

        case ACPI_TYPE_PROCESSOR:

        case ACPI_TYPE_POWER:

                /*

                 * No extra data for these types

                 */

                break;

        case ACPI_TYPE_LOCAL_REFERENCE:

                switch (internal_object->reference.opcode) {

                case AML_INT_NAMEPATH_OP:

                        /*

                         * Get the actual length of the full pathname to this object.

                         * The reference will be converted to the pathname to the object

                         */

                        length +=

                            ACPI_ROUND_UP_TO_NATIVE_WORD

                            (acpi_ns_get_pathname_length

                             (internal_object->reference.node));

                        break;

                default:

                        /*

                         * No other reference opcodes are supported.

                         * Notably, Locals and Args are not supported, but this may be

                         * required eventually.

                         */

                        ACPI_ERROR((AE_INFO,

                                    "Unsupported Reference opcode=%X in object %p",

                                    internal_object->reference.opcode,

                                    internal_object));

                        status = AE_TYPE;

                        break;

                }

                break;

        default:

                ACPI_ERROR((AE_INFO, "Unsupported type=%X in object %p",

                            ACPI_GET_OBJECT_TYPE(internal_object),

                            internal_object));

                status = AE_TYPE;

                break;

        }

        /*

         * Account for the space required by the object rounded up to the next

         * multiple of the machine word size.  This keeps each object aligned

         * on a machine word boundary. (preventing alignment faults on some

         * machines.)

         */

        *obj_length = ACPI_ROUND_UP_TO_NATIVE_WORD(length);

        return_ACPI_STATUS(status);

}

/*******************************************************************************

 *

 * FUNCTION:    acpi_ut_get_element_length

 *

 * PARAMETERS:  acpi_pkg_callback

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Get the length of one package element.

 *

 ******************************************************************************/

static acpi_status

acpi_ut_get_element_length(u8 object_type,

                           union acpi_operand_object *source_object,

                           union acpi_generic_state *state, void *context)

{

        acpi_status status = AE_OK;

        struct acpi_pkg_info *info = (struct acpi_pkg_info *)context;

        acpi_size object_space;

        switch (object_type) {

        case ACPI_COPY_TYPE_SIMPLE:

                /*

                 * Simple object - just get the size (Null object/entry is handled

                 * here also) and sum it into the running package length

                 */

                status =

                    acpi_ut_get_simple_object_size(source_object,

                                                   &object_space);

                if (ACPI_FAILURE(status)) {

                        return (status);

                }

                info->length += object_space;

                break;

        case ACPI_COPY_TYPE_PACKAGE:

                /* Package object - nothing much to do here, let the walk handle it */

                info->num_packages++;

                state->pkg.this_target_obj = NULL;

                break;

        default:

                /* No other types allowed */

                return (AE_BAD_PARAMETER);

        }

        return (status);

}

/*******************************************************************************

 *

 * FUNCTION:    acpi_ut_get_package_object_size

 *

 * PARAMETERS:  internal_object     - An ACPI internal object

 *              obj_length          - Where the length is returned

 *

 * RETURN:      Status

 *

 * DESCRIPTION: This function is called to determine the space required to

 *              contain a package object for return to an external user.

 *

 *              This is moderately complex since a package contains other

 *              objects including packages.

 *

 ******************************************************************************/

static acpi_status

acpi_ut_get_package_object_size(union acpi_operand_object *internal_object,

                                acpi_size * obj_length)

{

        acpi_status status;

        struct acpi_pkg_info info;

        ACPI_FUNCTION_TRACE_PTR(ut_get_package_object_size, internal_object);

        info.length = 0;

        info.object_space = 0;

        info.num_packages = 1;

        status = acpi_ut_walk_package_tree(internal_object, NULL,

                                           acpi_ut_get_element_length, &info);

        if (ACPI_FAILURE(status)) {

                return_ACPI_STATUS(status);

        }

        /*

         * We have handled all of the objects in all levels of the package.

         * just add the length of the package objects themselves.

         * Round up to the next machine word.

         */

        info.length += ACPI_ROUND_UP_TO_NATIVE_WORD(sizeof(union acpi_object)) *

            (acpi_size) info.num_packages;

        /* Return the total package length */

        *obj_length = info.length;

        return_ACPI_STATUS(status);

}

/*******************************************************************************

 *

 * FUNCTION:    acpi_ut_get_object_size

 *

 * PARAMETERS:  internal_object     - An ACPI internal object

 *              obj_length          - Where the length will be returned

 *

 * RETURN:      Status

 *

 * DESCRIPTION: This function is called to determine the space required to

 *              contain an object for return to an API user.

 *

 ******************************************************************************/

acpi_status

acpi_ut_get_object_size(union acpi_operand_object *internal_object,

                        acpi_size * obj_length)

{

        acpi_status status;

        ACPI_FUNCTION_ENTRY();

        if ((ACPI_GET_DESCRIPTOR_TYPE(internal_object) ==

             ACPI_DESC_TYPE_OPERAND)

            && (ACPI_GET_OBJECT_TYPE(internal_object) == ACPI_TYPE_PACKAGE)) {

                status =

                    acpi_ut_get_package_object_size(internal_object,

                                                    obj_length);

        } else {

                status =

                    acpi_ut_get_simple_object_size(internal_object, obj_length);

        }

        return (status);

}