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127 lines
4.8 KiB
127 lines
4.8 KiB
/**************************************************************************** |
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* sched/irq_attach.c |
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* |
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* Copyright (C) 2007-2008, 2010, 2012 Gregory Nutt. All rights 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 <nuttx/irq.h> |
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#include "irq_internal.h" |
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/**************************************************************************** |
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* Definitions |
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****************************************************************************/ |
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/**************************************************************************** |
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* Private Type Declarations |
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****************************************************************************/ |
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/**************************************************************************** |
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* Global Variables |
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****************************************************************************/ |
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/**************************************************************************** |
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* Private Variables |
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****************************************************************************/ |
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/**************************************************************************** |
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* Private Functions |
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****************************************************************************/ |
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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) |
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{ |
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#if NR_IRQS > 0 |
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int ret = ERROR; |
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if ((unsigned)irq < NR_IRQS) |
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{ |
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irqstate_t state; |
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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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state = irqsave(); |
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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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} |
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/* Save the new ISR in the table. */ |
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g_irqvector[irq] = isr; |
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irqrestore(state); |
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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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