include/standard-headers/linux/virtio_console.h

   1 /*
   2  * This header, excluding the #ifdef __KERNEL__ part, is BSD licensed so
   3  * anyone can use the definitions to implement compatible drivers/servers:
   4  *
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  * 3. Neither the name of IBM nor the names of its contributors
  15  *    may be used to endorse or promote products derived from this software
  16  *    without specific prior written permission.
  17  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL IBM OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * Copyright (C) Red Hat, Inc., 2009, 2010, 2011
  30  * Copyright (C) Amit Shah <amit.shah@redhat.com>, 2009, 2010, 2011
  31  */
  32 #ifndef _LINUX_VIRTIO_CONSOLE_H
  33 #define _LINUX_VIRTIO_CONSOLE_H
  34 #include "standard-headers/linux/types.h"
  35 #include "standard-headers/linux/virtio_types.h"
  36 #include "standard-headers/linux/virtio_ids.h"
  37 #include "standard-headers/linux/virtio_config.h"
  38
  39 /* Feature bits */
  40 #define VIRTIO_CONSOLE_F_SIZE   0       /* Does host provide console size? */
  41 #define VIRTIO_CONSOLE_F_MULTIPORT 1    /* Does host provide multiple ports? */
  42 #define VIRTIO_CONSOLE_F_EMERG_WRITE 2 /* Does host support emergency write? */
  43
  44 #define VIRTIO_CONSOLE_BAD_ID           (~(uint32_t)0)
  45
  46 struct virtio_console_config {
  47         /* colums of the screens */
  48         uint16_t cols;
  49         /* rows of the screens */
  50         uint16_t rows;
  51         /* max. number of ports this device can hold */
  52         uint32_t max_nr_ports;
  53         /* emergency write register */
  54         uint32_t emerg_wr;
  55 } QEMU_PACKED;
  56
  57 /*
  58  * A message that's passed between the Host and the Guest for a
  59  * particular port.
  60  */
  61 struct virtio_console_control {
  62         __virtio32 id;          /* Port number */
  63         __virtio16 event;       /* The kind of control event (see below) */
  64         __virtio16 value;       /* Extra information for the key */
  65 };
  66
  67 /* Some events for control messages */
  68 #define VIRTIO_CONSOLE_DEVICE_READY     0
  69 #define VIRTIO_CONSOLE_PORT_ADD         1
  70 #define VIRTIO_CONSOLE_PORT_REMOVE      2
  71 #define VIRTIO_CONSOLE_PORT_READY       3
  72 #define VIRTIO_CONSOLE_CONSOLE_PORT     4
  73 #define VIRTIO_CONSOLE_RESIZE           5
  74 #define VIRTIO_CONSOLE_PORT_OPEN        6
  75 #define VIRTIO_CONSOLE_PORT_NAME        7
  76
  77
  78 #endif /* _LINUX_VIRTIO_CONSOLE_H */