128 lines
4.8 KiB
C
128 lines
4.8 KiB
C
/****************************************************************************
|
|
* sched/irq_attach.c
|
|
*
|
|
* Copyright (C) 2007-2008, 2010, 2012 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 <nuttx/irq.h>
|
|
|
|
#include "irq_internal.h"
|
|
|
|
/****************************************************************************
|
|
* Definitions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Private Type Declarations
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Global Variables
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Private Variables
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Private Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: irq_attach
|
|
*
|
|
* Description:
|
|
* Configure the IRQ subsystem so that IRQ number 'irq' is dispatched to
|
|
* 'isr'
|
|
*
|
|
****************************************************************************/
|
|
|
|
int irq_attach(int irq, xcpt_t isr)
|
|
{
|
|
#if NR_IRQS > 0
|
|
int ret = ERROR;
|
|
|
|
if ((unsigned)irq < NR_IRQS)
|
|
{
|
|
irqstate_t state;
|
|
|
|
/* If the new ISR is NULL, then the ISR is being detached.
|
|
* In this case, disable the ISR and direct any interrupts
|
|
* to the unexpected interrupt handler.
|
|
*/
|
|
|
|
state = irqsave();
|
|
if (isr == NULL)
|
|
{
|
|
/* Disable the interrupt if we can before detaching it. We might
|
|
* not be able to do this if: (1) the device does not have a
|
|
* centralized interrupt controller (so up_disable_irq() is not
|
|
* supported). Or (2) if the device has different number for vector
|
|
* numbers and IRQ numbers (in that case, we don't know the correct
|
|
* IRQ number to use to disable the interrupt). In those cases, the
|
|
* code will just need to be careful that it disables all interrupt
|
|
* sources before detaching from the interrupt vector.
|
|
*/
|
|
|
|
#if !defined(CONFIG_ARCH_NOINTC) && !defined(CONFIG_ARCH_VECNOTIRQ)
|
|
up_disable_irq(irq);
|
|
#endif
|
|
/* Detaching the ISR really means re-attaching it to the
|
|
* unexpected exception handler.
|
|
*/
|
|
|
|
isr = irq_unexpected_isr;
|
|
}
|
|
|
|
/* Save the new ISR in the table. */
|
|
|
|
g_irqvector[irq] = isr;
|
|
irqrestore(state);
|
|
ret = OK;
|
|
}
|
|
|
|
return ret;
|
|
#else
|
|
return OK;
|
|
#endif
|
|
}
|