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 */
79