/* SPDX-License-Identifier: BSD-2-Clause */
/**
* @file
*
* @ingroup bsp_interrupt
*
* @brief This header file provides interfaces of the generic interrupt
* controller support.
*/
/*
* Copyright (C) 2016 Chris Johns <chrisj@rtems.org>
*
* Copyright (C) 2008, 2017 embedded brains GmbH (http://www.embedded-brains.de)
*
* 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.
*/
/*
* The API is based on concepts of Pavel Pisa, Till Straumann and Eric Valette.
*/
#ifndef LIBBSP_SHARED_IRQ_GENERIC_H
#define LIBBSP_SHARED_IRQ_GENERIC_H
#include <stdbool.h>
#include <rtems/irq-extension.h>
#include <rtems/score/assert.h>
#ifdef RTEMS_SMP
#include <rtems/score/atomic.h>
#endif
#include <bsp/irq.h>
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
#if !defined(BSP_INTERRUPT_VECTOR_MAX)
#error "BSP_INTERRUPT_VECTOR_MAX shall be defined"
#endif
#if defined(BSP_INTERRUPT_USE_INDEX_TABLE) && !defined(BSP_INTERRUPT_HANDLER_TABLE_SIZE)
#error "if you define BSP_INTERRUPT_USE_INDEX_TABLE, you have to define BSP_INTERRUPT_HANDLER_TABLE_SIZE etc. as well"
#endif
#define BSP_INTERRUPT_VECTOR_NUMBER (BSP_INTERRUPT_VECTOR_MAX + 1)
#ifndef BSP_INTERRUPT_HANDLER_TABLE_SIZE
#define BSP_INTERRUPT_HANDLER_TABLE_SIZE BSP_INTERRUPT_VECTOR_NUMBER
#endif
/* Internal macros for SMP support, do not use externally */
#ifdef RTEMS_SMP
#define bsp_interrupt_disable(level) do { (void) level; } while (0)
#define bsp_interrupt_enable(level) do { } while (0)
#define bsp_interrupt_fence(order) _Atomic_Fence(order)
#else
#define bsp_interrupt_disable(level) rtems_interrupt_disable(level)
#define bsp_interrupt_enable(level) rtems_interrupt_enable(level)
#define bsp_interrupt_fence(order) do { } while (0)
#endif
#define bsp_interrupt_assert(e) _Assert(e)
struct bsp_interrupt_handler_entry {
rtems_interrupt_handler handler;
void *arg;
const char *info;
struct bsp_interrupt_handler_entry *next;
};
typedef struct bsp_interrupt_handler_entry bsp_interrupt_handler_entry;
extern bsp_interrupt_handler_entry bsp_interrupt_handler_table [];
#ifdef BSP_INTERRUPT_USE_INDEX_TABLE
#if BSP_INTERRUPT_HANDLER_TABLE_SIZE < 0x100
typedef uint8_t bsp_interrupt_handler_index_type;
#elif BSP_INTERRUPT_HANDLER_TABLE_SIZE < 0x10000
typedef uint16_t bsp_interrupt_handler_index_type;
#else
typedef uint32_t bsp_interrupt_handler_index_type;
#endif
extern bsp_interrupt_handler_index_type bsp_interrupt_handler_index_table [];
#endif
static inline rtems_vector_number bsp_interrupt_handler_index(
rtems_vector_number vector
)
{
#ifdef BSP_INTERRUPT_USE_INDEX_TABLE
return bsp_interrupt_handler_index_table [vector];
#else
return vector;
#endif
}
/**
* @defgroup bsp_interrupt BSP Interrupt Support
*
* @ingroup RTEMSBSPsShared
*
* @brief Generic BSP Interrupt Support
*
* The BSP interrupt support manages a sequence of interrupt vector numbers
* ranging from zero to @ref BSP_INTERRUPT_VECTOR_MAX
* including the end points. It provides methods to
* @ref bsp_interrupt_handler_install() "install",
* @ref bsp_interrupt_handler_remove() "remove" and
* @ref bsp_interrupt_handler_dispatch() "dispatch" interrupt handlers for each
* vector number. It implements parts of the RTEMS interrupt manager.
*
* The entry points to a list of interrupt handlers are stored in a table
* (= handler table).
*
* You have to configure the BSP interrupt support in the <bsp/irq.h> file
* for each BSP. For a minimum configuration you have to provide
* @ref BSP_INTERRUPT_VECTOR_MAX.
*
* For boards with small memory requirements you can define
* @ref BSP_INTERRUPT_USE_INDEX_TABLE. With an enabled index table the handler
* table will be accessed via a small index table. You can define the size of
* the handler table with @ref BSP_INTERRUPT_HANDLER_TABLE_SIZE.
*
* You have to provide some special routines in your BSP (follow the links for
* the details):
* - bsp_interrupt_facility_initialize()
* - bsp_interrupt_vector_enable()
* - bsp_interrupt_vector_disable()
* - bsp_interrupt_handler_default()
*
* The following now deprecated functions are provided for backward
* compatibility:
* - BSP_get_current_rtems_irq_handler()
* - BSP_install_rtems_irq_handler()
* - BSP_install_rtems_shared_irq_handler()
* - BSP_remove_rtems_irq_handler()
* - BSP_rtems_irq_mngt_set()
* - BSP_rtems_irq_mngt_get()
*
* @{
*/
#ifdef BSP_INTERRUPT_CUSTOM_VALID_VECTOR
bool bsp_interrupt_is_valid_vector(rtems_vector_number vector);
#else
/**
* @brief Returns true if the interrupt vector with number @a vector is
* valid.
*/
static inline bool bsp_interrupt_is_valid_vector(rtems_vector_number vector)
{
return vector <= (rtems_vector_number) BSP_INTERRUPT_VECTOR_MAX;
}
#endif
/**
* @brief Default interrupt handler.
*
* This routine will be called from bsp_interrupt_handler_dispatch() with the
* current vector number @a vector when the handler list for this vector is
* empty or the vector number is out of range.
*
* @note This function must cope with arbitrary vector numbers @a vector.
*/
void bsp_interrupt_handler_default(rtems_vector_number vector);
/**
* @brief Initialize BSP interrupt support.
*
* You must call this function before you can install, remove and dispatch
* interrupt handlers. There is no protection against concurrent
* initialization. This function must be called at most once. The BSP
* specific bsp_interrupt_facility_initialize() function will be called after
* all internals are initialized. If the BSP specific initialization fails,
* then this is a fatal error. The fatal error source is
* RTEMS_FATAL_SOURCE_BSP and the fatal error code is
* BSP_FATAL_INTERRUPT_INITIALIZATION.
*/
void bsp_interrupt_initialize(void);
/**
* @brief BSP specific initialization.
*
* This routine will be called form bsp_interrupt_initialize() and shall do the
* following:
* - Initialize the facilities that call bsp_interrupt_handler_dispatch(). For
* example on PowerPC the external exception handler.
* - Initialize the interrupt controller. You shall set the interrupt
* controller in a state such that interrupts are disabled for all vectors.
* The vectors will be enabled with your bsp_interrupt_vector_enable() function
* and disabled via your bsp_interrupt_vector_disable() function. These
* functions have to work afterwards.
*
* @return On success RTEMS_SUCCESSFUL shall be returned.
*/
rtems_status_code bsp_interrupt_facility_initialize(void);
/**
* @brief Enables the interrupt vector with number @a vector.
*
* This function shall enable the vector at the corresponding facility (in most
* cases the interrupt controller). It will be called then the first handler
* is installed for the vector in bsp_interrupt_handler_install() for example.
*
* @note The implementation should use
* bsp_interrupt_assert(bsp_interrupt_is_valid_vector(vector)) to valdiate the
* vector number.
*
* @note You must not install or remove an interrupt handler in this function.
* This may result in a deadlock.
*/
void bsp_interrupt_vector_enable(rtems_vector_number vector);
/**
* @brief Disables the interrupt vector with number @a vector.
*
* This function shall disable the vector at the corresponding facility (in
* most cases the interrupt controller). It will be called then the last
* handler is removed for the vector in bsp_interrupt_handler_remove() for
* example.
*
* @note The implementation should use
* bsp_interrupt_assert(bsp_interrupt_is_valid_vector(vector)) to valdiate the
* vector number.
*
* @note You must not install or remove an interrupt handler in this function.
* This may result in a deadlock.
*/
void bsp_interrupt_vector_disable(rtems_vector_number vector);
/**
* @brief Sequencially calls all interrupt handlers for the vector number @a
* vector.
*
* If the vector number is out of range or the handler list is empty
* bsp_interrupt_handler_default() will be called with argument @a vector.
*
* You can call this function within every context which can be disabled via
* rtems_interrupt_disable().
*/
static inline void bsp_interrupt_handler_dispatch(rtems_vector_number vector)
{
if (bsp_interrupt_is_valid_vector(vector)) {
const bsp_interrupt_handler_entry *e =
&bsp_interrupt_handler_table [bsp_interrupt_handler_index(vector)];
do {
rtems_interrupt_handler handler;
void *arg;
arg = e->arg;
bsp_interrupt_fence(ATOMIC_ORDER_ACQUIRE);
handler = e->handler;
(*handler)(arg);
e = e->next;
} while (e != NULL);
} else {
bsp_interrupt_handler_default(vector);
}
}
/**
* @brief Is interrupt handler empty.
*
* This routine returns true if the handler is empty and has not been
* initialised else false is returned. The interrupt lock is not used
* so this call can be used from within interrupts.
*
* @return If empty true shall be returned else false is returned.
*/
bool bsp_interrupt_handler_is_empty(rtems_vector_number vector);
/** @} */
/* For internal use only */
void bsp_interrupt_lock(void);
/* For internal use only */
void bsp_interrupt_unlock(void);
#ifdef __cplusplus
}
#endif /* __cplusplus */
#endif /* LIBBSP_SHARED_IRQ_GENERIC_H */
