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#define LCR_DLAB    0x80    /** Divisor Latch Access bit. */
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#define LCR_DLAB   0x80  /** Divisor Latch Access bit. */
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#define MCR_OUT2    0x08    /** OUT2. */
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#define MCR_OUT2   0x08  /** OUT2. */
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/** NS16550 registers. */
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/** NS16550 registers. */
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struct ns16550 {
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typedef struct {
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    ioport8_t rbr;  /**< Receiver Buffer Register. */
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    ioport8_t rbr;      /**< Receiver Buffer Register. */
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    ioport8_t ier;  /**< Interrupt Enable Register. */
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    ioport8_t ier;      /**< Interrupt Enable Register. */
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    union {
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    union {
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        ioport8_t iir;  /**< Interrupt Ident Register (read). */
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        ioport8_t iir;  /**< Interrupt Ident Register (read). */
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        ioport8_t fcr;  /**< FIFO control register (write). */
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        ioport8_t fcr;  /**< FIFO control register (write). */
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    } __attribute__ ((packed));
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    } __attribute__ ((packed));
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    ioport8_t lcr;  /**< Line Control register. */
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    ioport8_t lcr;      /**< Line Control register. */
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    ioport8_t mcr;  /**< Modem Control Register. */
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    ioport8_t mcr;      /**< Modem Control Register. */
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    ioport8_t lsr;  /**< Line Status Register. */
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    ioport8_t lsr;      /**< Line Status Register. */
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} __attribute__ ((packed));
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} __attribute__ ((packed)) ns16550_t;
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typedef struct ns16550 ns16550_t;
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/** Structure representing the ns16550 device. */
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/** Structure representing the ns16550 device. */
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typedef struct ns16550_instance {
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typedef struct {
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    devno_t devno;
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    devno_t devno;
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    ns16550_t *ns16550;
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    ns16550_t *ns16550;
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    irq_t irq;
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    irq_t irq;
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    chardev_t *devout;
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    indev_t kbrdin;
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} ns16550_instance_t;
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} ns16550_instance_t;
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extern bool ns16550_init(ns16550_t *, devno_t, inr_t, cir_t, void *,
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extern indev_t *ns16550_init(ns16550_t *, devno_t, inr_t, cir_t, void *)
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    chardev_t *);
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extern irq_ownership_t ns16550_claim(irq_t *);
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extern void ns16550_irq_handler(irq_t *);
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#endif
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#endif
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/** @}
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/** @}
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 */
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 */