227 lines
7.5 KiB
C
227 lines
7.5 KiB
C
/****************************************************************************
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* sched/irq/irq.h
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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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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* Pre-processor Definitions
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****************************************************************************/
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#if defined(CONFIG_ARCH_MINIMAL_VECTORTABLE) && \
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!defined(CONFIG_ARCH_NUSER_INTERRUPTS)
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# error CONFIG_ARCH_NUSER_INTERRUPTS is not defined
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#endif
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/****************************************************************************
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* Public Types
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****************************************************************************/
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/* This is the type of the list of interrupt handlers, one for each IRQ.
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* This type provided all of the information necessary to irq_dispatch to
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* transfer control to interrupt handlers after the occurrence of an
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* interrupt.
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*/
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struct irq_info_s
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{
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xcpt_t handler; /* Address of the interrupt handler */
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FAR void *arg; /* The argument provided to the interrupt handler. */
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#ifdef CONFIG_SCHED_IRQMONITOR
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clock_t start; /* Time interrupt attached */
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#ifdef CONFIG_HAVE_LONG_LONG
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uint64_t count; /* Number of interrupts on this IRQ */
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#else
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uint32_t mscount; /* Number of interrupts on this IRQ (MS) */
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uint32_t lscount; /* Number of interrupts on this IRQ (LS) */
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#endif
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uint32_t time; /* Maximum execution time on this IRQ */
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#endif
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};
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#ifdef CONFIG_SCHED_IRQMONITOR
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/* This is the type of the callback from irq_foreach(). */
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typedef CODE int (*irq_foreach_t)(int irq, FAR struct irq_info_s *info,
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FAR void *arg);
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#endif
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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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#ifdef CONFIG_ARCH_MINIMAL_VECTORTABLE
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extern struct irq_info_s g_irqvector[CONFIG_ARCH_NUSER_INTERRUPTS];
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#else
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extern struct irq_info_s g_irqvector[NR_IRQS];
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#endif
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#ifdef CONFIG_ARCH_MINIMAL_VECTORTABLE
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/* This is the interrupt vector mapping table. This must be provided by
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* architecture specific logic if CONFIG_ARCH_MINIMAL_VECTORTABLE is define
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* in the configuration.
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*
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* REVISIT: This should be declared in include/nuttx/irq.h. The declaration
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* at that location, however, introduces a circular include dependency so the
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* declaration is here for the time being.
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*/
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extern const irq_mapped_t g_irqmap[NR_IRQS];
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#endif
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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;
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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;
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extern volatile cpu_set_t g_cpu_irqset;
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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, FAR void *arg);
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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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* Input Parameters:
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* rtcb - Points to the blocked TCB that is ready-to-run
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*
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* Returned 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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/****************************************************************************
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* Name: irq_foreach
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*
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* Description:
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* This function traverses the internal list of interrupts and provides
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* information about each attached interrupt.
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*
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* Some caution may be necessary: If interrupts are disabled then the
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* counts may change during the traversal. If pre-emption is enabled, then
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* the traversed sequence may be widely separated in time.
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*
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* Input Parameters:
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* callback - This function will be called for each attached interrupt
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* along with the IRQ number, an instance of struct irq_info_s,
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* and the caller provided argument
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* args - This is an opaque argument provided with each call to the
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* callback function.
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*
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* Returned Value:
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* Zero (OK) is returned after callback has been invoked for all of
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* the attached interrupts. The callback function may terminate the
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* traversal at any time by returning a non-zero value. In that case,
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* irq_foreach will return that non-zero value.
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*
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****************************************************************************/
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#ifdef CONFIG_SCHED_IRQMONITOR
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int irq_foreach(irq_foreach_t callback, FAR void *arg);
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#endif
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#ifdef CONFIG_IRQCHAIN
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void irqchain_initialize(void);
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bool is_irqchain(int ndx, xcpt_t isr);
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int irqchain_attach(int ndx, xcpt_t isr, FAR void *arg);
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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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