source: rtems/cpukit/include/rtems/rtems/part.h @ 98cef40

/* SPDX-License-Identifier: BSD-2-Clause */

/**
 * @file
 *
 * @ingroup RTEMSImplClassicPartition
 *
 * @brief This header file provides the Partition Manager API.
 */

/*
 * Copyright (C) 2020, 2021 embedded brains GmbH (http://www.embedded-brains.de)
 * Copyright (C) 1988, 2008 On-Line Applications Research Corporation (OAR)
 *
 * 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.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * 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 MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 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 DAMAGE.
 */

/*
 * This file is part of the RTEMS quality process and was automatically
 * generated.  If you find something that needs to be fixed or
 * worded better please post a report or patch to an RTEMS mailing list
 * or raise a bug report:
 *
 * https://www.rtems.org/bugs.html
 *
 * For information on updating and regenerating please refer to the How-To
 * section in the Software Requirements Engineering chapter of the
 * RTEMS Software Engineering manual.  The manual is provided as a part of
 * a release.  For development sources please refer to the online
 * documentation at:
 *
 * https://docs.rtems.org
 */

/* Generated from spec:/rtems/part/if/header */

#ifndef _RTEMS_RTEMS_PART_H
#define _RTEMS_RTEMS_PART_H

#include <stddef.h>
#include <stdint.h>
#include <rtems/rtems/attr.h>
#include <rtems/rtems/status.h>
#include <rtems/rtems/types.h>
#include <rtems/score/cpu.h>

#ifdef __cplusplus
extern "C" {
#endif

/* Generated from spec:/rtems/part/if/group */

/**
 * @defgroup RTEMSAPIClassicPart Partition Manager
 *
 * @ingroup RTEMSAPIClassic
 *
 * @brief The Partition Manager provides facilities to dynamically allocate
 *   memory in fixed-size units.
 */

/* Generated from spec:/rtems/part/if/alignment */

/**
 * @ingroup RTEMSAPIClassicPart
 *
 * @brief This constant defines the minimum alignment of a partition buffer in
 *   bytes.
 *
 * @par Notes
 * Use it with RTEMS_ALIGNED() to define the alignment of partition buffer
 * types or statically allocated partition buffer areas.
 */
#define RTEMS_PARTITION_ALIGNMENT CPU_SIZEOF_POINTER

/* Generated from spec:/rtems/part/if/create */

/**
 * @ingroup RTEMSAPIClassicPart
 *
 * @brief Creates a partition.
 *
 * @param name is the object name of the partition.
 *
 * @param starting_address is the starting address of the buffer area used by
 *   the partition.
 *
 * @param length is the length in bytes of the buffer area used by the
 *   partition.
 *
 * @param buffer_size is the size in bytes of a buffer managed by the
 *   partition.
 *
 * @param attribute_set is the attribute set of the partition.
 *
 * @param[out] id is the pointer to an ::rtems_id object.  When the directive
 *   call is successful, the identifier of the created partition will be stored
 *   in this object.
 *
 * This directive creates a partition of fixed size buffers from a physically
 * contiguous memory space which starts at ``starting_address`` and is
 * ``length`` bytes in size.  Each allocated buffer is to be of ``buffer_size``
 * in bytes.  The partition has the user-defined object name specified in
 * ``name``.  The assigned object identifier is returned in ``id``.  This
 * identifier is used to access the partition with other partition related
 * directives.
 *
 * The **attribute set** specified in ``attribute_set`` is built through a
 * *bitwise or* of the attribute constants described below.  Not all
 * combinations of attributes are allowed.  Some attributes are mutually
 * exclusive.  If mutually exclusive attributes are combined, the behaviour is
 * undefined.  Attributes not mentioned below are not evaluated by this
 * directive and have no effect.  Default attributes can be selected by using
 * the #RTEMS_DEFAULT_ATTRIBUTES constant.
 *
 * The partition has a local or global **scope** in a multiprocessing network
 * (this attribute does not refer to SMP systems).  The scope is selected by
 * the mutually exclusive #RTEMS_LOCAL and #RTEMS_GLOBAL attributes.
 *
 * * A **local scope** is the default and can be emphasized through the use of
 *   the #RTEMS_LOCAL attribute.  A local partition can be only used by the
 *   node which created it.
 *
 * * A **global scope** is established if the #RTEMS_GLOBAL attribute is set.
 *   The memory space used for the partition must reside in shared memory.
 *   Setting the global attribute in a single node system has no effect.
 *
 * @retval ::RTEMS_SUCCESSFUL The requested operation was successful.
 *
 * @retval ::RTEMS_INVALID_NAME The ``name`` parameter was invalid.
 *
 * @retval ::RTEMS_INVALID_ADDRESS The ``id`` parameter was NULL.
 *
 * @retval ::RTEMS_INVALID_SIZE The ``length`` parameter was 0.
 *
 * @retval ::RTEMS_INVALID_SIZE The ``buffer_size`` parameter was 0.
 *
 * @retval ::RTEMS_INVALID_SIZE The ``length`` parameter was less than the
 *   ``buffer_size`` parameter.
 *
 * @retval ::RTEMS_INVALID_SIZE The ``buffer_size`` parameter was not an
 *   integral multiple of the pointer size.
 *
 * @retval ::RTEMS_INVALID_SIZE The ``buffer_size`` parameter was less than two
 *   times the pointer size.
 *
 * @retval ::RTEMS_INVALID_ADDRESS The ``starting_address`` parameter was not
 *   on a pointer size boundary.
 *
 * @retval ::RTEMS_TOO_MANY There was no inactive object available to create a
 *   partition.  The number of partitions available to the application is
 *   configured through the #CONFIGURE_MAXIMUM_PARTITIONS application
 *   configuration option.
 *
 * @retval ::RTEMS_TOO_MANY In multiprocessing configurations, there was no
 *   inactive global object available to create a global semaphore.  The number
 *   of global objects available to the application is configured through the
 *   #CONFIGURE_MP_MAXIMUM_GLOBAL_OBJECTS application configuration option.
 *
 * @par Notes
 * @parblock
 * The partition buffer area specified by the ``starting_address`` must be
 * properly aligned.  It must be possible to directly store target architecture
 * pointers and also the user data.  For example, if the user data contains
 * some long double or vector data types, the partition buffer area and the
 * buffer size must take the alignment of these types into account which is
 * usually larger than the pointer alignment.  A cache line alignment may be
 * also a factor.  Use #RTEMS_PARTITION_ALIGNMENT to specify the minimum
 * alignment of a partition buffer type.
 *
 * The ``buffer_size`` parameter must be an integral multiple of the pointer
 * size on the target architecture.  Additionally, ``buffer_size`` must be
 * large enough to hold two pointers on the target architecture.  This is
 * required for RTEMS to manage the buffers when they are free.
 *
 * For control and maintenance of the partition, RTEMS allocates a PTCB from
 * the local PTCB free pool and initializes it. Memory from the partition
 * buffer area is not used by RTEMS to store the PTCB.
 *
 * The PTCB for a global partition is allocated on the local node.  Partitions
 * should not be made global unless remote tasks must interact with the
 * partition.  This is to avoid the overhead incurred by the creation of a
 * global partition.  When a global partition is created, the partition's name
 * and identifier must be transmitted to every node in the system for insertion
 * in the local copy of the global object table.
 * @endparblock
 *
 * @par Constraints
 * @parblock
 * The following constraints apply to this directive:
 *
 * * The directive may be called from within device driver initialization
 *   context.
 *
 * * The directive may be called from within task context.
 *
 * * The directive may obtain and release the object allocator mutex.  This may
 *   cause the calling task to be preempted.
 *
 * * When the directive operates on a global object, the directive sends a
 *   message to remote nodes.  This may preempt the calling task.
 *
 * * The number of partitions available to the application is configured
 *   through the #CONFIGURE_MAXIMUM_PARTITIONS application configuration
 *   option.
 *
 * * Where the object class corresponding to the directive is configured to use
 *   unlimited objects, the directive may allocate memory from the RTEMS
 *   Workspace.
 *
 * * The number of global objects available to the application is configured
 *   through the #CONFIGURE_MP_MAXIMUM_GLOBAL_OBJECTS application configuration
 *   option.
 * @endparblock
 */
rtems_status_code rtems_partition_create(
  rtems_name      name,
  void           *starting_address,
  uintptr_t       length,
  size_t          buffer_size,
  rtems_attribute attribute_set,
  rtems_id       *id
);

/* Generated from spec:/rtems/part/if/ident */

/**
 * @ingroup RTEMSAPIClassicPart
 *
 * @brief Identifies a partition by the object name.
 *
 * @param name is the object name to look up.
 *
 * @param node is the node or node set to search for a matching object.
 *
 * @param[out] id is the pointer to an ::rtems_id object.  When the directive
 *   call is successful, the object identifier of an object with the specified
 *   name will be stored in this object.
 *
 * This directive obtains a partition identifier associated with the partition
 * name specified in ``name``.
 *
 * The node to search is specified in ``node``.  It shall be
 *
 * * a valid node number,
 *
 * * the constant #RTEMS_SEARCH_ALL_NODES to search in all nodes,
 *
 * * the constant #RTEMS_SEARCH_LOCAL_NODE to search in the local node only, or
 *
 * * the constant #RTEMS_SEARCH_OTHER_NODES to search in all nodes except the
 *   local node.
 *
 * @retval ::RTEMS_SUCCESSFUL The requested operation was successful.
 *
 * @retval ::RTEMS_INVALID_ADDRESS The ``id`` parameter was NULL.
 *
 * @retval ::RTEMS_INVALID_NAME The ``name`` parameter was 0.
 *
 * @retval ::RTEMS_INVALID_NAME There was no object with the specified name on
 *   the specified nodes.
 *
 * @retval ::RTEMS_INVALID_NODE In multiprocessing configurations, the
 *   specified node was invalid.
 *
 * @par Notes
 * @parblock
 * If the partition name is not unique, then the partition identifier will
 * match the first partition with that name in the search order.  However, this
 * partition identifier is not guaranteed to correspond to the desired
 * partition.
 *
 * The objects are searched from lowest to the highest index.  If ``node`` is
 * #RTEMS_SEARCH_ALL_NODES, all nodes are searched with the local node being
 * searched first.  All other nodes are searched from lowest to the highest
 * node number.
 *
 * If node is a valid node number which does not represent the local node, then
 * only the partitions exported by the designated node are searched.
 *
 * This directive does not generate activity on remote nodes.  It accesses only
 * the local copy of the global object table.
 *
 * The partition identifier is used with other partition related directives to
 * access the partition.
 * @endparblock
 *
 * @par Constraints
 * @parblock
 * The following constraints apply to this directive:
 *
 * * The directive may be called from within any runtime context.
 *
 * * The directive will not cause the calling task to be preempted.
 * @endparblock
 */
rtems_status_code rtems_partition_ident(
  rtems_name name,
  uint32_t   node,
  rtems_id  *id
);

/* Generated from spec:/rtems/part/if/delete */

/**
 * @ingroup RTEMSAPIClassicPart
 *
 * @brief Deletes the partition.
 *
 * @param id is the partition identifier.
 *
 * This directive deletes the partition specified by ``id``.
 *
 * @retval ::RTEMS_SUCCESSFUL The requested operation was successful.
 *
 * @retval ::RTEMS_INVALID_ID There was no partition associated with the
 *   identifier specified by ``id``.
 *
 * @retval ::RTEMS_ILLEGAL_ON_REMOTE_OBJECT The partition resided on a remote
 *   node.
 *
 * @retval ::RTEMS_RESOURCE_IN_USE There were buffers of the partition still in
 *   use.
 *
 * @par Notes
 * @parblock
 * The partition cannot be deleted if any of its buffers are still allocated.
 *
 * The PTCB for the deleted partition is reclaimed by RTEMS.
 *
 * When a global partition is deleted, the partition identifier must be
 * transmitted to every node in the system for deletion from the local copy of
 * the global object table.
 *
 * The partition must reside on the local node, even if the partition was
 * created with the #RTEMS_GLOBAL attribute.
 * @endparblock
 *
 * @par Constraints
 * @parblock
 * The following constraints apply to this directive:
 *
 * * The directive may be called from within device driver initialization
 *   context.
 *
 * * The directive may be called from within task context.
 *
 * * The directive may obtain and release the object allocator mutex.  This may
 *   cause the calling task to be preempted.
 *
 * * When the directive operates on a global object, the directive sends a
 *   message to remote nodes.  This may preempt the calling task.
 *
 * * The calling task does not have to be the task that created the object.
 *   Any local task that knows the object identifier can delete the object.
 *
 * * Where the object class corresponding to the directive is configured to use
 *   unlimited objects, the directive may free memory to the RTEMS Workspace.
 * @endparblock
 */
rtems_status_code rtems_partition_delete( rtems_id id );

/* Generated from spec:/rtems/part/if/get-buffer */

/**
 * @ingroup RTEMSAPIClassicPart
 *
 * @brief Tries to get a buffer from the partition.
 *
 * @param id is the partition identifier.
 *
 * @param[out] buffer is the pointer to a ``void`` pointer object.  When the
 *   directive call is successful, the pointer to the allocated buffer will be
 *   stored in this object.
 *
 * This directive allows a buffer to be obtained from the partition specified
 * by ``id``.  The address of the allocated buffer is returned through the
 * ``buffer`` parameter.
 *
 * @retval ::RTEMS_SUCCESSFUL The requested operation was successful.
 *
 * @retval ::RTEMS_INVALID_ID There was no partition associated with the
 *   identifier specified by ``id``.
 *
 * @retval ::RTEMS_INVALID_ADDRESS The ``buffer`` parameter was NULL.
 *
 * @retval ::RTEMS_UNSATISFIED There was no free buffer available to allocate
 *   and return.
 *
 * @par Notes
 * @parblock
 * The buffer start alignment is determined by the memory area and buffer size
 * used to create the partition.
 *
 * A task cannot wait on a buffer to become available.
 *
 * Getting a buffer from a global partition which does not reside on the local
 * node will generate a request telling the remote node to allocate a buffer
 * from the partition.
 * @endparblock
 *
 * @par Constraints
 * @parblock
 * The following constraints apply to this directive:
 *
 * * When the directive operates on a local object, the directive may be called
 *   from within interrupt context.
 *
 * * The directive may be called from within task context.
 *
 * * When the directive operates on a local object, the directive will not
 *   cause the calling task to be preempted.
 *
 * * When the directive operates on a remote object, the directive sends a
 *   message to the remote node and waits for a reply.  This will preempt the
 *   calling task.
 * @endparblock
 */
rtems_status_code rtems_partition_get_buffer( rtems_id id, void **buffer );

/* Generated from spec:/rtems/part/if/return-buffer */

/**
 * @ingroup RTEMSAPIClassicPart
 *
 * @brief Returns the buffer to the partition.
 *
 * @param id is the partition identifier.
 *
 * @param buffer is the pointer to the buffer to return.
 *
 * This directive returns the buffer specified by ``buffer`` to the partition
 * specified by ``id``.
 *
 * @retval ::RTEMS_SUCCESSFUL The requested operation was successful.
 *
 * @retval ::RTEMS_INVALID_ID There was no partition associated with the
 *   identifier specified by ``id``.
 *
 * @retval ::RTEMS_INVALID_ADDRESS The buffer referenced by ``buffer`` was not
 *   in the partition.
 *
 * @par Notes
 * Returning a buffer multiple times is an error.  It will corrupt the internal
 * state of the partition.
 *
 * @par Constraints
 * @parblock
 * The following constraints apply to this directive:
 *
 * * When the directive operates on a local object, the directive may be called
 *   from within interrupt context.
 *
 * * The directive may be called from within task context.
 *
 * * When the directive operates on a local object, the directive will not
 *   cause the calling task to be preempted.
 *
 * * When the directive operates on a remote object, the directive sends a
 *   message to the remote node and waits for a reply.  This will preempt the
 *   calling task.
 * @endparblock
 */
rtems_status_code rtems_partition_return_buffer( rtems_id id, void *buffer );

#ifdef __cplusplus
}
#endif

#endif /* _RTEMS_RTEMS_PART_H */