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void ns16550_interrupt(void);
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void ns16550_interrupt(void);
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/** Initialize keyboard and service interrupts using kernel routine */
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/** Initialize keyboard and service interrupts using kernel routine */
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void ns16550_grab(void)
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void ns16550_grab(void)
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{
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{
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    ipl_t ipl = interrupts_disable();
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    ns16550_ier_write(&ns16550, IER_ERBFI);     /* enable receiver interrupt */
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    ns16550_ier_write(&ns16550, IER_ERBFI);     /* enable receiver interrupt */
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    while (ns16550_lsr_read(&ns16550) & LSR_DATA_READY)
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    while (ns16550_lsr_read(&ns16550) & LSR_DATA_READY)
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        (void) ns16550_rbr_read(&ns16550);
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        (void) ns16550_rbr_read(&ns16550);
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    spinlock_lock(&ns16550_irq.lock);
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    ns16550_irq.notif_cfg.notify = false;
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    ns16550_irq.notif_cfg.notify = false;
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    spinlock_unlock(&ns16550_irq.lock);
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    interrupts_restore(ipl);
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}
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}
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/** Resume the former interrupt vector */
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/** Resume the former interrupt vector */
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void ns16550_release(void)
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void ns16550_release(void)
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{
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{
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    ipl_t ipl = interrupts_disable();
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    spinlock_lock(&ns16550_irq.lock);
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    if (ns16550_irq.notif_cfg.answerbox)
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    if (ns16550_irq.notif_cfg.answerbox)
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        ns16550_irq.notif_cfg.notify = true;
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        ns16550_irq.notif_cfg.notify = true;
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    spinlock_unlock(&ns16550_irq.lock);
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    interrupts_restore(ipl);
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}
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}
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/** Initialize ns16550.
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/** Initialize ns16550.
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 *
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 *
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 * @param devno Device number.
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 * @param devno Device number.