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-.. comment SPDX-License-Identifier: CC-BY-SA-4.0
-
-.. COMMENT: COPYRIGHT (c) 1988-2008.
-.. COMMENT: On-Line Applications Research Corporation (OAR).
-.. COMMENT: All rights reserved.
-
-Interrupt Manager
-#################
-
-Introduction
-============
-
-Any real-time executive must provide a mechanism for quick response to
-externally generated interrupts to satisfy the critical time constraints of the
-application.  The interrupt manager provides this mechanism for RTEMS.  This
-manager permits quick interrupt response times by providing the critical
-ability to alter task execution which allows a task to be preempted upon exit
-from an ISR.  The interrupt manager includes the following directive:
-
-- rtems_interrupt_catch_ - Establish an ISR
-
-- rtems_interrupt_disable_ - Disable Interrupts
-
-- rtems_interrupt_enable_ - Enable Interrupts
-
-- rtems_interrupt_flash_ - Flash Interrupt
-
-- rtems_interrupt_local_disable_ - Disable Interrupts on Current Processor
-
-- rtems_interrupt_local_enable_ - Enable Interrupts on Current Processor
-
-- rtems_interrupt_lock_initialize_ - Initialize an ISR Lock
-
-- rtems_interrupt_lock_acquire_ - Acquire an ISR Lock
-
-- rtems_interrupt_lock_release_ - Release an ISR Lock
-
-- rtems_interrupt_lock_acquire_isr_ - Acquire an ISR Lock from ISR
-
-- rtems_interrupt_lock_release_isr_ - Release an ISR Lock from ISR
-
-- rtems_interrupt_is_in_progress_ - Is an ISR in Progress
-
-Background
-==========
-
-Processing an Interrupt
------------------------
-.. index:: interrupt processing
-
-The interrupt manager allows the application to connect a function to a
-hardware interrupt vector.  When an interrupt occurs, the processor will
-automatically vector to RTEMS.  RTEMS saves and restores all registers which
-are not preserved by the normal C calling convention for the target processor
-and invokes the user's ISR.  The user's ISR is responsible for processing the
-interrupt, clearing the interrupt if necessary, and device specific
-manipulation.
-
-.. index:: rtems_vector_number
-
-The ``rtems_interrupt_catch`` directive connects a procedure to an interrupt
-vector.  The vector number is managed using the ``rtems_vector_number`` data
-type.
-
-The interrupt service routine is assumed to abide by these conventions and have
-a prototype similar to the following:
-
-.. index:: rtems_isr
-
-.. code-block:: c
-
-    rtems_isr user_isr(
-        rtems_vector_number vector
-    );
-
-The vector number argument is provided by RTEMS to allow the application to
-identify the interrupt source.  This could be used to allow a single routine to
-service interrupts from multiple instances of the same device.  For example, a
-single routine could service interrupts from multiple serial ports and use the
-vector number to identify which port requires servicing.
-
-To minimize the masking of lower or equal priority level interrupts, the ISR
-should perform the minimum actions required to service the interrupt.  Other
-non-essential actions should be handled by application tasks.  Once the user's
-ISR has completed, it returns control to the RTEMS interrupt manager which will
-perform task dispatching and restore the registers saved before the ISR was
-invoked.
-
-The RTEMS interrupt manager guarantees that proper task scheduling and
-dispatching are performed at the conclusion of an ISR.  A system call made by
-the ISR may have readied a task of higher priority than the interrupted task.
-Therefore, when the ISR completes, the postponed dispatch processing must be
-performed.  No dispatch processing is performed as part of directives which
-have been invoked by an ISR.
-
-Applications must adhere to the following rule if proper task scheduling and
-dispatching is to be performed:
-
-.. note::
-
-  The interrupt manager must be used for all ISRs which may be interrupted by
-  the highest priority ISR which invokes an RTEMS directive.
-
-Consider a processor which allows a numerically low interrupt level to
-interrupt a numerically greater interrupt level.  In this example, if an RTEMS
-directive is used in a level 4 ISR, then all ISRs which execute at levels 0
-through 4 must use the interrupt manager.
-
-Interrupts are nested whenever an interrupt occurs during the execution of
-another ISR.  RTEMS supports efficient interrupt nesting by allowing the nested
-ISRs to terminate without performing any dispatch processing.  Only when the
-outermost ISR terminates will the postponed dispatching occur.
-
-RTEMS Interrupt Levels
-----------------------
-.. index:: interrupt levels
-
-Many processors support multiple interrupt levels or priorities.  The exact
-number of interrupt levels is processor dependent.  RTEMS internally supports
-256 interrupt levels which are mapped to the processor's interrupt levels.  For
-specific information on the mapping between RTEMS and the target processor's
-interrupt levels, refer to the Interrupt Processing chapter of the Applications
-Supplement document for a specific target processor.
-
-Disabling of Interrupts by RTEMS
---------------------------------
-.. index:: disabling interrupts
-
-During the execution of directive calls, critical sections of code may be
-executed.  When these sections are encountered, RTEMS disables all maskable
-interrupts before the execution of the section and restores them to the
-previous level upon completion of the section.  RTEMS has been optimized to
-ensure that interrupts are disabled for a minimum length of time.  The maximum
-length of time interrupts are disabled by RTEMS is processor dependent and is
-detailed in the Timing Specification chapter of the Applications Supplement
-document for a specific target processor.
-
-Non-maskable interrupts (NMI) cannot be disabled, and ISRs which execute at
-this level MUST NEVER issue RTEMS system calls.  If a directive is invoked,
-unpredictable results may occur due to the inability of RTEMS to protect its
-critical sections.  However, ISRs that make no system calls may safely execute
-as non-maskable interrupts.
-
-Operations
-==========
-
-Establishing an ISR
--------------------
-
-The ``rtems_interrupt_catch`` directive establishes an ISR for the system.  The
-address of the ISR and its associated CPU vector number are specified to this
-directive.  This directive installs the RTEMS interrupt wrapper in the
-processor's Interrupt Vector Table and the address of the user's ISR in the
-RTEMS' Vector Table.  This directive returns the previous contents of the
-specified vector in the RTEMS' Vector Table.
-
-Directives Allowed from an ISR
-------------------------------
-
-Using the interrupt manager ensures that RTEMS knows when a directive is being
-called from an ISR.  The ISR may then use system calls to synchronize itself
-with an application task.  The synchronization may involve messages, events or
-signals being passed by the ISR to the desired task.  Directives invoked by an
-ISR must operate only on objects which reside on the local node.  The following
-is a list of RTEMS system calls that may be made from an ISR:
-
-- Task Management
-  Although it is acceptable to operate on the RTEMS_SELF task (e.g.  the
-  currently executing task), while in an ISR, this will refer to the
-  interrupted task.  Most of the time, it is an application implementation
-  error to use RTEMS_SELF from an ISR.
-
-  - rtems_task_suspend
-  - rtems_task_resume
-
-- Interrupt Management
-
-  - rtems_interrupt_enable
-  - rtems_interrupt_disable
-  - rtems_interrupt_flash
-  - rtems_interrupt_lock_acquire
-  - rtems_interrupt_lock_release
-  - rtems_interrupt_lock_acquire_isr
-  - rtems_interrupt_lock_release_isr
-  - rtems_interrupt_is_in_progress
-  - rtems_interrupt_catch
-
-- Clock Management
-
-  - rtems_clock_set
-  - rtems_clock_get
-  - rtems_clock_get_tod
-  - rtems_clock_get_tod_timeval
-  - rtems_clock_get_seconds_since_epoch
-  - rtems_clock_get_ticks_per_second
-  - rtems_clock_get_ticks_since_boot
-  - rtems_clock_get_uptime
-  - rtems_clock_set_nanoseconds_extension
-  - rtems_clock_tick
-
-- Timer Management
-
-  - rtems_timer_cancel
-  - rtems_timer_reset
-  - rtems_timer_fire_after
-  - rtems_timer_fire_when
-  - rtems_timer_server_fire_after
-  - rtems_timer_server_fire_when
-
-- Event Management
-
-  - rtems_event_send
-  - rtems_event_system_send
-  - rtems_event_transient_send
-
-- Semaphore Management
-
-  - rtems_semaphore_release
-
-- Message Management
-
-  - rtems_message_queue_send
-  - rtems_message_queue_urgent
-
-- Signal Management
-
-  - rtems_signal_send
-
-- Dual-Ported Memory Management
-
-  - rtems_port_external_to_internal
-  - rtems_port_internal_to_external
-
-- IO Management
-  The following services are safe to call from an ISR if and only if
-  the device driver service invoked is also safe.  The IO Manager itself
-  is safe but the invoked driver entry point may or may not be.
-
-  - rtems_io_initialize
-  - rtems_io_open
-  - rtems_io_close
-  - rtems_io_read
-  - rtems_io_write
-  - rtems_io_control
-
-- Fatal Error Management
-
-  - rtems_fatal
-  - rtems_fatal_error_occurred
-
-- Multiprocessing
-
-  - rtems_multiprocessing_announce
-
-Directives
-==========
-
-This section details the interrupt manager's directives.  A subsection is
-dedicated to each of this manager's directives and describes the calling
-sequence, related constants, usage, and status codes.
-
-.. _rtems_interrupt_catch:
-
-INTERRUPT_CATCH - Establish an ISR
-----------------------------------
-.. index:: establish an ISR
-.. index:: install an ISR
-
-**CALLING SEQUENCE:**
-
-.. index:: rtems_interrupt_catch
-
-.. code-block:: c
-
-    rtems_status_code rtems_interrupt_catch(
-        rtems_isr_entry      new_isr_handler,
-        rtems_vector_number  vector,
-        rtems_isr_entry     *old_isr_handler
-    );
-
-**DIRECTIVE STATUS CODES:**
-
-.. list-table::
- :class: rtems-wrap
-
- * - ``RTEMS_SUCCESSFUL``
-   -  ISR established successfully
- * - ``RTEMS_INVALID_NUMBER``
-   -  illegal vector number
- * - ``RTEMS_INVALID_ADDRESS``
-   -  illegal ISR entry point or invalid ``old_isr_handler``
-
-**DESCRIPTION:**
-
-This directive establishes an interrupt service routine (ISR) for the specified
-interrupt vector number.  The ``new_isr_handler`` parameter specifies the entry
-point of the ISR.  The entry point of the previous ISR for the specified vector
-is returned in ``old_isr_handler``.
-
-To release an interrupt vector, pass the old handler's address obtained when
-the vector was first capture.
-
-**NOTES:**
-
-This directive will not cause the calling task to be preempted.
-
-.. _rtems_interrupt_disable:
-
-INTERRUPT_DISABLE - Disable Interrupts
---------------------------------------
-.. index:: disable interrupts
-
-**CALLING SEQUENCE:**
-
-.. index:: rtems_interrupt_disable
-
-.. code-block:: c
-
-    void rtems_interrupt_disable(
-        rtems_interrupt_level  level
-    );
-
-**DIRECTIVE STATUS CODES:**
-
-NONE
-
-**DESCRIPTION:**
-
-.. sidebar:: *Macro*
-
-  This directive is implemented as a macro which modifies the ``level``
-  parameter.
-
-This directive disables all maskable interrupts and returns the previous
-``level``.  A later invocation of the ``rtems_interrupt_enable`` directive
-should be used to restore the interrupt level.
-
-**NOTES:**
-
-This directive will not cause the calling task to be preempted.
-
-This directive is only available on uni-processor configurations.  The
-directive ``rtems_interrupt_local_disable`` is available on all configurations.
-
-.. _rtems_interrupt_enable:
-
-INTERRUPT_ENABLE - Enable Interrupts
-------------------------------------
-.. index:: enable interrupts
-
-**CALLING SEQUENCE:**
-
-.. index:: rtems_interrupt_enable
-
-.. code-block:: c
-
-    void rtems_interrupt_enable(
-       rtems_interrupt_level  level
-    );
-
-**DIRECTIVE STATUS CODES:**
-
-NONE
-
-**DESCRIPTION:**
-
-This directive enables maskable interrupts to the ``level`` which was returned
-by a previous call to ``rtems_interrupt_disable``.  Immediately prior to
-invoking this directive, maskable interrupts should be disabled by a call to
-``rtems_interrupt_disable`` and will be enabled when this directive returns to
-the caller.
-
-**NOTES:**
-
-This directive will not cause the calling task to be preempted.
-
-This directive is only available on uni-processor configurations.  The
-directive ``rtems_interrupt_local_enable`` is available on all configurations.
-
-.. _rtems_interrupt_flash:
-
-INTERRUPT_FLASH - Flash Interrupts
-----------------------------------
-.. index:: flash interrupts
-
-**CALLING SEQUENCE:**
-
-.. index:: rtems_interrupt_flash
-
-.. code-block:: c
-
-    void rtems_interrupt_flash(
-        rtems_interrupt_level level
-    );
-
-**DIRECTIVE STATUS CODES:**
-
-NONE
-
-**DESCRIPTION:**
-
-This directive temporarily enables maskable interrupts to the ``level`` which
-was returned by a previous call to ``rtems_interrupt_disable``.  Immediately
-prior to invoking this directive, maskable interrupts should be disabled by a
-call to ``rtems_interrupt_disable`` and will be redisabled when this directive
-returns to the caller.
-
-**NOTES:**
-
-This directive will not cause the calling task to be preempted.
-
-This directive is only available on uni-processor configurations.  The
-directives ``rtems_interrupt_local_disable`` and
-``rtems_interrupt_local_enable`` is available on all configurations.
-
-.. _rtems_interrupt_local_disable:
-
-INTERRUPT_LOCAL_DISABLE - Disable Interrupts on Current Processor
------------------------------------------------------------------
-.. index:: disable interrupts
-
-**CALLING SEQUENCE:**
-
-.. index:: rtems_interrupt_local_disable
-
-.. code-block:: c
-
-    void rtems_interrupt_local_disable(
-        rtems_interrupt_level  level
-    );
-
-**DIRECTIVE STATUS CODES:**
-
-NONE
-
-**DESCRIPTION:**
-
-.. sidebar:: *Macro*
-
-  This directive is implemented as a macro which modifies the ``level``
-  parameter.
-
-This directive disables all maskable interrupts and returns the previous
-``level``.  A later invocation of the ``rtems_interrupt_local_enable`` directive
-should be used to restore the interrupt level.
-
-**NOTES:**
-
-This directive will not cause the calling task to be preempted.
-
-On SMP configurations this will not ensure system wide mutual exclusion.  Use
-interrupt locks instead.
-
-.. _rtems_interrupt_local_enable:
-
-INTERRUPT_LOCAL_ENABLE - Enable Interrupts on Current Processor
----------------------------------------------------------------
-.. index:: enable interrupts
-
-**CALLING SEQUENCE:**
-
-.. index:: rtems_interrupt_local_enable
-
-.. code-block:: c
-
-    void rtems_interrupt_local_enable(
-        rtems_interrupt_level  level
-    );
-
-**DIRECTIVE STATUS CODES:**
-
-NONE
-
-**DESCRIPTION:**
-
-This directive enables maskable interrupts to the ``level`` which was returned
-by a previous call to ``rtems_interrupt_local_disable``.  Immediately prior to
-invoking this directive, maskable interrupts should be disabled by a call to
-``rtems_interrupt_local_disable`` and will be enabled when this directive
-returns to the caller.
-
-**NOTES:**
-
-This directive will not cause the calling task to be preempted.
-
-.. _rtems_interrupt_lock_initialize:
-
-INTERRUPT_LOCK_INITIALIZE - Initialize an ISR Lock
---------------------------------------------------
-
-**CALLING SEQUENCE:**
-
-.. index:: rtems_interrupt_lock_initialize
-
-.. code-block:: c
-
-    void rtems_interrupt_lock_initialize(
-        rtems_interrupt_lock *lock
-    );
-
-**DIRECTIVE STATUS CODES:**
-
-NONE
-
-**DESCRIPTION:**
-
-Initializes an interrupt lock.
-
-**NOTES:**
-
-Concurrent initialization leads to unpredictable results.
-
-.. _rtems_interrupt_lock_acquire:
-
-INTERRUPT_LOCK_ACQUIRE - Acquire an ISR Lock
---------------------------------------------
-
-**CALLING SEQUENCE:**
-
-.. index:: rtems_interrupt_lock_acquire
-
-.. code-block:: c
-
-    void rtems_interrupt_lock_acquire(
-        rtems_interrupt_lock *lock,
-        rtems_interrupt_level level
-    );
-
-**DIRECTIVE STATUS CODES:**
-
-NONE
-
-**DESCRIPTION:**
-
-Interrupts will be disabled.  On SMP configurations this directive acquires a
-SMP lock.
-
-**NOTES:**
-
-This directive will not cause the calling thread to be preempted.  This
-directive can be used in thread and interrupt context.
-
-.. _rtems_interrupt_lock_release:
-
-INTERRUPT_LOCK_RELEASE - Release an ISR Lock
---------------------------------------------
-
-**CALLING SEQUENCE:**
-
-.. index:: rtems_interrupt_lock_release
-
-.. code-block:: c
-
-    void rtems_interrupt_lock_release(
-        rtems_interrupt_lock *lock,
-        rtems_interrupt_level level
-    );
-
-**DIRECTIVE STATUS CODES:**
-
-NONE
-
-**DESCRIPTION:**
-
-The interrupt status will be restored.  On SMP configurations this directive
-releases a SMP lock.
-
-**NOTES:**
-
-This directive will not cause the calling thread to be preempted.  This
-directive can be used in thread and interrupt context.
-
-.. _rtems_interrupt_lock_acquire_isr:
-
-INTERRUPT_LOCK_ACQUIRE_ISR - Acquire an ISR Lock from ISR
----------------------------------------------------------
-
-**CALLING SEQUENCE:**
-
-.. index:: rtems_interrupt_lock_acquire_isr
-
-.. code-block:: c
-
-    void rtems_interrupt_lock_acquire_isr(
-        rtems_interrupt_lock *lock,
-        rtems_interrupt_level level
-    );
-
-**DIRECTIVE STATUS CODES:**
-
-NONE
-
-**DESCRIPTION:**
-
-The interrupt status will remain unchanged.  On SMP configurations this
-directive acquires a SMP lock.
-
-In case the corresponding interrupt service routine can be interrupted by
-higher priority interrupts and these interrupts enter the critical section
-protected by this lock, then the result is unpredictable.
-
-**NOTES:**
-
-This directive should be called from the corresponding interrupt service
-routine.
-
-.. _rtems_interrupt_lock_release_isr:
-
-INTERRUPT_LOCK_RELEASE_ISR - Release an ISR Lock from ISR
----------------------------------------------------------
-
-**CALLING SEQUENCE:**
-
-.. index:: rtems_interrupt_lock_release_isr
-
-.. code-block:: c
-
-    void rtems_interrupt_lock_release_isr(
-        rtems_interrupt_lock *lock,
-        rtems_interrupt_level level
-    );
-
-**DIRECTIVE STATUS CODES:**
-
-NONE
-
-**DESCRIPTION:**
-
-The interrupt status will remain unchanged.  On SMP configurations this
-directive releases a SMP lock.
-
-**NOTES:**
-
-This directive should be called from the corresponding interrupt service
-routine.
-
-.. _rtems_interrupt_is_in_progress:
-
-INTERRUPT_IS_IN_PROGRESS - Is an ISR in Progress
-------------------------------------------------
-.. index:: is interrupt in progress
-
-**CALLING SEQUENCE:**
-
-.. index:: rtems_interrupt_is_in_progress
-
-.. code-block:: c
-
-    bool rtems_interrupt_is_in_progress(void);
-
-**DIRECTIVE STATUS CODES:**
-
-NONE
-
-**DESCRIPTION:**
-
-This directive returns ``TRUE`` if the processor is currently servicing an
-interrupt and ``FALSE`` otherwise.  A return value of ``TRUE`` indicates that
-the caller is an interrupt service routine, *NOT* a task.  The directives
-available to an interrupt service routine are restricted.
-
-**NOTES:**
-
-This directive will not cause the calling task to be preempted.