xen/include/xen/serial.h


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/******************************************************************************
 * serial.h
 * 
 * Framework for serial device drivers.
 * 
 * Copyright (c) 2003-2008, K A Fraser
 */

#ifndef __XEN_SERIAL_H__
#define __XEN_SERIAL_H__

#include <xen/init.h>
#include <xen/spinlock.h>

struct cpu_user_regs;

/* Register a character-receive hook on the specified COM port. */
typedef void (*serial_rx_fn)(char, struct cpu_user_regs *);
void serial_set_rx_handler(int handle, serial_rx_fn fn);

/* Number of characters we buffer for a polling receiver. */
#define serial_rxbufsz 32

/* Number of characters we buffer for an interrupt-driven transmitter. */
extern unsigned int serial_txbufsz;

struct uart_driver;

enum serial_port_state {
    serial_unused,
    serial_parsed,
    serial_initialized
};

struct vuart_info {
    paddr_t base_addr;          /* Base address of the UART */
    unsigned long size;         /* Size of the memory region */
    unsigned long data_off;     /* Data register offset */
    unsigned long status_off;   /* Status register offset */