153 lines
5.0 KiB
C
153 lines
5.0 KiB
C
/****************************************************************************
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* sched/irq/irq_attach.c
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*
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* Copyright (C) 2007-2008, 2010, 2012, 2017-2018 Gregory Nutt. All rights
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* reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <errno.h>
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#include <nuttx/irq.h>
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#include "irq/irq.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: irq_attach
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*
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* Description:
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* Configure the IRQ subsystem so that IRQ number 'irq' is dispatched to
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* 'isr'
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*
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****************************************************************************/
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int irq_attach(int irq, xcpt_t isr, FAR void *arg)
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{
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#if NR_IRQS > 0
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int ret = -EINVAL;
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if ((unsigned)irq < NR_IRQS)
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{
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irqstate_t flags;
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int ndx;
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#ifdef CONFIG_ARCH_MINIMAL_VECTORTABLE
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/* Is there a mapping for this IRQ number? */
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ndx = g_irqmap[irq];
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if ((unsigned)ndx >= CONFIG_ARCH_NUSER_INTERRUPTS)
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{
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/* No.. then return failure. */
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return ret;
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}
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#else
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ndx = irq;
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#endif
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/* If the new ISR is NULL, then the ISR is being detached.
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* In this case, disable the ISR and direct any interrupts
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* to the unexpected interrupt handler.
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*/
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flags = enter_critical_section();
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if (isr == NULL)
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{
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/* Disable the interrupt if we can before detaching it. We might
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* not be able to do this if: (1) the device does not have a
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* centralized interrupt controller (so up_disable_irq() is not
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* supported). Or (2) if the device has different number for vector
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* numbers and IRQ numbers (in that case, we don't know the correct
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* IRQ number to use to disable the interrupt). In those cases, the
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* code will just need to be careful that it disables all interrupt
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* sources before detaching from the interrupt vector.
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*/
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#if !defined(CONFIG_ARCH_NOINTC) && !defined(CONFIG_ARCH_VECNOTIRQ)
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up_disable_irq(irq);
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#endif
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/* Detaching the ISR really means re-attaching it to the
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* unexpected exception handler.
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*/
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isr = irq_unexpected_isr;
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arg = NULL;
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}
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#ifdef CONFIG_IRQCHAIN
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/* Save the new ISR and its argument in the table.
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* If there is only one ISR on this irq, then .handler point to the ISR
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* and .arg point to the ISR parameter; Otherwise, .handler point to
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* irqchain_dispatch and .arg point to irqchain_s.
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*/
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if (is_irqchain(ndx, isr))
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{
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ret = irqchain_attach(ndx, isr, arg);
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leave_critical_section(flags);
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return ret;
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}
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#endif
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/* Save the new ISR and its argument in the table. */
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g_irqvector[ndx].handler = isr;
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g_irqvector[ndx].arg = arg;
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#ifdef CONFIG_SCHED_IRQMONITOR
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g_irqvector[ndx].start = clock_systimer();
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#ifdef CONFIG_HAVE_LONG_LONG
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g_irqvector[ndx].count = 0;
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#else
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g_irqvector[ndx].mscount = 0;
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g_irqvector[ndx].lscount = 0;
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#endif
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#endif
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leave_critical_section(flags);
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ret = OK;
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}
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return ret;
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#else
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return OK;
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#endif
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}
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