nuttx/sched/irq/irq_dispatch.c

/****************************************************************************
 * sched/irq/irq_dispatch.c
 *
 *   Copyright (C) 2007, 2008, 2017 Gregory Nutt. All rights reserved.
 *   Author: Gregory Nutt <gnutt@nuttx.org>
 *
 * 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.
 * 3. Neither the name NuttX nor the names of its contributors may be
 *    used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * 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.
 *
 ****************************************************************************/

/****************************************************************************
 * Included Files
 ****************************************************************************/

#include <nuttx/config.h>

#include <debug.h>
#include <nuttx/arch.h>
#include <nuttx/irq.h>
#include <nuttx/random.h>

#include "irq/irq.h"

/****************************************************************************
 * Public Functions
 ****************************************************************************/

/****************************************************************************
 * Name: irq_dispatch
 *
 * Description:
 *   This function must be called from the architecture-specific logic in
 *   order to dispatch an interrupt to the appropriate, registered handling
 *   logic.
 *
 ****************************************************************************/

void irq_dispatch(int irq, FAR void *context)
{
  xcpt_t vector;
  FAR void *arg;

  /* Perform some sanity checks */

#if NR_IRQS > 0
  if ((unsigned)irq >= NR_IRQS)
    {
      vector = irq_unexpected_isr;
      arg    = NULL;
    }
  else
    {
#ifdef CONFIG_ARCH_MINIMAL_VECTORTABLE
      irq_mapped_t ndx = g_irqmap[irq];
      if (ndx >= CONFIG_ARCH_NUSER_INTERRUPTS)
        {
          vector = irq_unexpected_isr;
          arg    = NULL;
        }
      else
        {
          vector = g_irqvector[ndx].handler;
          arg    = g_irqvector[ndx].arg;
        }
#else
      vector = g_irqvector[irq].handler;
      arg    = g_irqvector[irq].arg;
#endif
    }

#else
  vector = irq_unexpected_isr;
  arg    = NULL;
#endif

#ifdef CONFIG_CRYPTO_RANDOM_POOL_COLLECT_IRQ_RANDOMNESS
  /* Add interrupt timing randomness to entropy pool */

  add_irq_randomness(irq);
#endif

  /* Then dispatch to the interrupt handler */

  vector(irq, context, arg);
}