diff options
Diffstat (limited to 'nuttx/sched/irq_attach.c')
-rw-r--r-- | nuttx/sched/irq_attach.c | 127 |
1 files changed, 127 insertions, 0 deletions
diff --git a/nuttx/sched/irq_attach.c b/nuttx/sched/irq_attach.c new file mode 100644 index 000000000..3f27a0530 --- /dev/null +++ b/nuttx/sched/irq_attach.c @@ -0,0 +1,127 @@ +/**************************************************************************** + * 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 +} |