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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 ns16550_instance {
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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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} 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 bool ns16550_init(ns16550_t *, devno_t, inr_t, cir_t, void *);
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extern void ns16550_grab(void);
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extern void ns16550_grab(void);
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extern void ns16550_release(void);
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extern void ns16550_release(void);