147 lines
4.9 KiB
C
147 lines
4.9 KiB
C
/****************************************************************************
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* sched/irq/irq.h
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*
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* Copyright (C) 2007, 2008, 2013-2014, 2017 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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#ifndef __SCHED_IRQ_IRQ_H
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#define __SCHED_IRQ_IRQ_H
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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/compiler.h>
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#include <sys/types.h>
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#include <stdbool.h>
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#include <nuttx/arch.h>
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#include <nuttx/irq.h>
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#include <nuttx/spinlock.h>
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/****************************************************************************
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* Public Data
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****************************************************************************/
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/* This is the list of interrupt handlers, one for each IRQ. This is used
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* by irq_dispatch to transfer control to interrupt handlers after the
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* occurrence of an interrupt.
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*/
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extern FAR xcpt_t g_irqvector[NR_IRQS];
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#ifdef CONFIG_SMP
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/* This is the spinlock that enforces critical sections when interrupts are
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* disabled.
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*/
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extern volatile spinlock_t g_cpu_irqlock SP_SECTION;
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/* Used to keep track of which CPU(s) hold the IRQ lock. */
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extern volatile spinlock_t g_cpu_irqsetlock SP_SECTION;
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extern volatile cpu_set_t g_cpu_irqset SP_SECTION;
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/* Handles nested calls to enter_critical section from interrupt handlers */
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extern volatile uint8_t g_cpu_nestcount[CONFIG_SMP_NCPUS];
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#endif
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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#ifdef __cplusplus
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#define EXTERN extern "C"
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extern "C"
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{
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#else
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#define EXTERN extern
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#endif
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/****************************************************************************
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* Name: irq_initialize
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*
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* Description:
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* Configure the IRQ subsystem
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*
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****************************************************************************/
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void weak_function irq_initialize(void);
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/****************************************************************************
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* Name: irq_unexpected_isr
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*
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* Description:
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* An interrupt has been received for an IRQ that was never registered
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* with the system.
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*
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****************************************************************************/
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int irq_unexpected_isr(int irq, FAR void *context);
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/****************************************************************************
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* Name: irq_cpu_locked
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*
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* Description:
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* Test if the IRQ lock set OR if this CPU holds the IRQ lock
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* There is an interaction with pre-emption controls and IRQ locking:
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* Even if the pre-emption is enabled, tasks will be forced to pend if
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* the IRQ lock is also set UNLESS the CPU starting the task is the
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* holder of the IRQ lock.
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*
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* Inputs:
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* rtcb - Points to the blocked TCB that is ready-to-run
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*
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* Return Value:
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* true - IRQs are locked by a different CPU.
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* false - IRQs are unlocked OR if they are locked BUT this CPU
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* is the holder of the lock.
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*
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* Warning: This values are volatile at only valid at the instance that
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* the CPU set was queried.
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*
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****************************************************************************/
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#ifdef CONFIG_SMP
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bool irq_cpu_locked(int cpu);
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#endif
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#undef EXTERN
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#ifdef __cplusplus
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}
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#endif
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#endif /* __SCHED_IRQ_IRQ_H */
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