FreeBSD/Linux Kernel Cross Reference
sys/dev/virtio/console/virtio_console.h

     /*-
      * This header is BSD licensed so anyone can use the definitions to implement
      * compatible drivers/servers.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
      * 1. Redistributions of source code must retain the above copyright
      *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. Neither the name of IBM nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL IBM OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     * Copyright (C) Red Hat, Inc., 2009, 2010, 2011
     * Copyright (C) Amit Shah <amit.shah@redhat.com>, 2009, 2010, 2011
     *
     * $FreeBSD$
     */
    
    #ifndef _VIRTIO_CONSOLE_H
    #define _VIRTIO_CONSOLE_H
    
    /* Feature bits */
    #define VIRTIO_CONSOLE_F_SIZE           0x01    /* Console size */
    #define VIRTIO_CONSOLE_F_MULTIPORT      0x02    /* Multiple ports */
    #define VIRTIO_CONSOLE_F_EMERG_WRITE    0x04    /* Emergency write */
    
    #define VIRTIO_CONSOLE_BAD_ID           (~(uint32_t)0)
    
    struct virtio_console_config {
            /* colums of the screens */
            uint16_t cols;
            /* rows of the screens */
            uint16_t rows;
            /* max. number of ports this device can hold */
            uint32_t max_nr_ports;
            /* emergency write register */
            uint32_t emerg_wr;
    } __packed;
    
    /*
     * A message that's passed between the Host and the Guest for a
     * particular port.
     */
    struct virtio_console_control {
            uint32_t id;            /* Port number */
            uint16_t event;         /* The kind of control event (see below) */
            uint16_t 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
    
    #endif /* _VIRTIO_CONSOLE_H */

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