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Rev 3655 Rev 3906
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 * devices and logic for dispatching interrupts to IRQ handlers
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 * devices and logic for dispatching interrupts to IRQ handlers
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 * defined by those devices.
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 * defined by those devices.
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 *
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 *
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 * This code is designed to support:
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 * This code is designed to support:
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 * - multiple devices sharing single IRQ
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 * - multiple devices sharing single IRQ
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 * - multiple IRQs per signle device
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 * - multiple IRQs per single device
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 * - multiple instances of the same device
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 *
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 *
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 *
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 *
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 * Note about architectures.
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 * Note about architectures.
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 *
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 *
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 * Some architectures has the term IRQ well defined. Examples
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 * Some architectures has the term IRQ well defined. Examples
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    irq->inr = -1;
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    irq->inr = -1;
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    irq->devno = -1;
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    irq->devno = -1;
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    irq->trigger = (irq_trigger_t) 0;
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    irq->trigger = (irq_trigger_t) 0;
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    irq->claim = NULL;
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    irq->claim = NULL;
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    irq->handler = NULL;
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    irq->handler = NULL;
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    irq->arg = NULL;
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    irq->instance = NULL;
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    irq->cir = NULL;
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    irq->cir = NULL;
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    irq->cir_arg = NULL;
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    irq->cir_arg = NULL;
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    irq->notif_cfg.notify = false;
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    irq->notif_cfg.notify = false;
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    irq->notif_cfg.answerbox = NULL;
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    irq->notif_cfg.answerbox = NULL;
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    irq->notif_cfg.code = NULL;
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    irq->notif_cfg.code = NULL;
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    bool rv;
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    bool rv;
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    spinlock_lock(&irq->lock);
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    spinlock_lock(&irq->lock);
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    if (devno == -1) {
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    if (devno == -1) {
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        /* Invoked by irq_dispatch_and_lock(). */
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        /* Invoked by irq_dispatch_and_lock(). */
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        rv = ((irq->inr == inr) &&
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        rv = ((irq->inr == inr) && (irq->claim() == IRQ_ACCEPT));
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            (irq->claim(irq->instance) == IRQ_ACCEPT));
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    } else {
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    } else {
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        /* Invoked by irq_find_and_lock(). */
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        /* Invoked by irq_find_and_lock(). */
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        rv = ((irq->inr == inr) && (irq->devno == devno));
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        rv = ((irq->inr == inr) && (irq->devno == devno));
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    }
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    }
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    bool rv;
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    bool rv;
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    spinlock_lock(&irq->lock);
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    spinlock_lock(&irq->lock);
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    if (devno == -1) {
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    if (devno == -1) {
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        /* Invoked by irq_dispatch_and_lock() */
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        /* Invoked by irq_dispatch_and_lock() */
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        rv = (irq->claim() == IRQ_ACCEPT);
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        rv = (irq->claim(irq->instance) == IRQ_ACCEPT);
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    } else {
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    } else {
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        /* Invoked by irq_find_and_lock() */
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        /* Invoked by irq_find_and_lock() */
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        rv = (irq->devno == devno);
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        rv = (irq->devno == devno);
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    }
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    }
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