#ifndef _LINUX_VIRTIO_CONSOLE_H
  #define _LINUX_VIRTIO_CONSOLE_H

  #include <linux/types.h>

  #include <linux/virtio_ids.h>

  #include <linux/virtio_config.h>

  /*
   * This header, excluding the #ifdef __KERNEL__ part, is BSD licensed so
   * anyone can use the definitions to implement compatible drivers/servers.

   *

   * Copyright (C) Red Hat, Inc., 2009, 2010, 2011
   * Copyright (C) Amit Shah <amit.shah@redhat.com>, 2009, 2010, 2011

   */

  /* Feature bits */
  #define VIRTIO_CONSOLE_F_SIZE	0	/* Does host provide console size? */

  #define VIRTIO_CONSOLE_F_MULTIPORT 1	/* Does host provide multiple ports? */

  #define VIRTIO_CONSOLE_BAD_ID		(~(u32)0)

  struct virtio_console_config {
  	/* colums of the screens */
  	__u16 cols;
  	/* rows of the screens */
  	__u16 rows;

  	/* max. number of ports this device can hold */
  	__u32 max_nr_ports;

  } __attribute__((packed));

  /*
   * A message that's passed between the Host and the Guest for a
   * particular port.
   */
  struct virtio_console_control {
  	__u32 id;		/* Port number */
  	__u16 event;		/* The kind of control event (see below) */
  	__u16 value;		/* Extra information for the key */
  };
  
  /* Some events for control messages */

  #define VIRTIO_CONSOLE_DEVICE_READY	0
  #define VIRTIO_CONSOLE_PORT_ADD		1
  #define VIRTIO_CONSOLE_PORT_REMOVE	2
  #define VIRTIO_CONSOLE_PORT_READY	3
  #define VIRTIO_CONSOLE_CONSOLE_PORT	4
  #define VIRTIO_CONSOLE_RESIZE		5
  #define VIRTIO_CONSOLE_PORT_OPEN	6
  #define VIRTIO_CONSOLE_PORT_NAME	7

  #ifdef __KERNEL__
  int __init virtio_cons_early_init(int (*put_chars)(u32, const char *, int));
  #endif /* __KERNEL__ */
  
  #endif /* _LINUX_VIRTIO_CONSOLE_H */