17634ba255
This commit adds a new feature, MULTIPORT. If the host supports this feature as well, the config space has the number of ports defined for that device. New ports are spawned according to this information. The config space also has the maximum number of ports that can be spawned for a particular device. This is useful in initializing the appropriate number of virtqueues in advance, as ports might be hot-plugged in later. Using this feature, generic ports can be created which are not tied to hvc consoles. We also open up a private channel between the host and the guest via which some "control" messages are exchanged for the ports, like whether the port being spawned is a console port, resizing the console window, etc. Next commits will add support for hotplugging and presenting char devices in /dev/ for bi-directional guest-host communication. Signed-off-by: Amit Shah <amit.shah@redhat.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
47 lines
1.3 KiB
C
47 lines
1.3 KiB
C
#ifndef _LINUX_VIRTIO_CONSOLE_H
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#define _LINUX_VIRTIO_CONSOLE_H
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#include <linux/types.h>
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#include <linux/virtio_ids.h>
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#include <linux/virtio_config.h>
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/*
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* This header, excluding the #ifdef __KERNEL__ part, is BSD licensed so
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* anyone can use the definitions to implement compatible drivers/servers.
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*
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* Copyright (C) Red Hat, Inc., 2009, 2010
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*/
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/* Feature bits */
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#define VIRTIO_CONSOLE_F_SIZE 0 /* Does host provide console size? */
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#define VIRTIO_CONSOLE_F_MULTIPORT 1 /* Does host provide multiple ports? */
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struct virtio_console_config {
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/* colums of the screens */
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__u16 cols;
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/* rows of the screens */
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__u16 rows;
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/* max. number of ports this device can hold */
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__u32 max_nr_ports;
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/* number of ports added so far */
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__u32 nr_ports;
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} __attribute__((packed));
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/*
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* A message that's passed between the Host and the Guest for a
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* particular port.
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*/
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struct virtio_console_control {
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__u32 id; /* Port number */
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__u16 event; /* The kind of control event (see below) */
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__u16 value; /* Extra information for the key */
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};
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/* Some events for control messages */
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#define VIRTIO_CONSOLE_PORT_READY 0
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#define VIRTIO_CONSOLE_CONSOLE_PORT 1
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#define VIRTIO_CONSOLE_RESIZE 2
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#ifdef __KERNEL__
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int __init virtio_cons_early_init(int (*put_chars)(u32, const char *, int));
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#endif /* __KERNEL__ */
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#endif /* _LINUX_VIRTIO_CONSOLE_H */
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