root / hw / virtio-console.c @ 31d0f80f
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/*
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* Virtio Console and Generic Serial Port Devices
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*
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* Copyright Red Hat, Inc. 2009, 2010
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*
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* Authors:
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* Amit Shah <amit.shah@redhat.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2. See
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* the COPYING file in the top-level directory.
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*/
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#include "qemu-char.h" |
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#include "qemu-error.h" |
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#include "virtio-serial.h" |
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typedef struct VirtConsole { |
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VirtIOSerialPort port; |
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CharDriverState *chr; |
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} VirtConsole; |
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/* Callback function that's called when the guest sends us data */
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static ssize_t flush_buf(VirtIOSerialPort *port, const uint8_t *buf, size_t len) |
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{ |
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VirtConsole *vcon = DO_UPCAST(VirtConsole, port, port); |
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return qemu_chr_write(vcon->chr, buf, len);
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} |
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/* Callback function that's called when the guest opens the port */
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static void guest_open(VirtIOSerialPort *port) |
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{ |
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VirtConsole *vcon = DO_UPCAST(VirtConsole, port, port); |
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qemu_chr_guest_open(vcon->chr); |
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} |
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/* Callback function that's called when the guest closes the port */
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static void guest_close(VirtIOSerialPort *port) |
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{ |
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VirtConsole *vcon = DO_UPCAST(VirtConsole, port, port); |
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qemu_chr_guest_close(vcon->chr); |
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} |
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/* Readiness of the guest to accept data on a port */
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static int chr_can_read(void *opaque) |
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{ |
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VirtConsole *vcon = opaque; |
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return virtio_serial_guest_ready(&vcon->port);
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} |
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/* Send data from a char device over to the guest */
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static void chr_read(void *opaque, const uint8_t *buf, int size) |
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{ |
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VirtConsole *vcon = opaque; |
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virtio_serial_write(&vcon->port, buf, size); |
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} |
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static void chr_event(void *opaque, int event) |
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{ |
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VirtConsole *vcon = opaque; |
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switch (event) {
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case CHR_EVENT_OPENED:
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virtio_serial_open(&vcon->port); |
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break;
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case CHR_EVENT_CLOSED:
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virtio_serial_close(&vcon->port); |
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break;
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} |
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} |
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static int generic_port_init(VirtConsole *vcon, VirtIOSerialPort *port) |
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{ |
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if (vcon->chr) {
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qemu_chr_add_handlers(vcon->chr, chr_can_read, chr_read, chr_event, |
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vcon); |
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vcon->port.info->have_data = flush_buf; |
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vcon->port.info->guest_open = guest_open; |
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vcon->port.info->guest_close = guest_close; |
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} |
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return 0; |
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} |
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/* Virtio Console Ports */
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static int virtconsole_initfn(VirtIOSerialPort *port) |
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{ |
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VirtConsole *vcon = DO_UPCAST(VirtConsole, port, port); |
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return generic_port_init(vcon, port);
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} |
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static int virtconsole_exitfn(VirtIOSerialPort *port) |
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{ |
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VirtConsole *vcon = DO_UPCAST(VirtConsole, port, port); |
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if (vcon->chr) {
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/*
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* Instead of closing the chardev, free it so it can be used
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* for other purposes.
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*/
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qemu_chr_add_handlers(vcon->chr, NULL, NULL, NULL, NULL); |
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} |
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return 0; |
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} |
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static VirtIOSerialPortInfo virtconsole_info = {
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.qdev.name = "virtconsole",
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.qdev.size = sizeof(VirtConsole),
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.is_console = true,
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.init = virtconsole_initfn, |
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.exit = virtconsole_exitfn, |
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.qdev.props = (Property[]) { |
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DEFINE_PROP_UINT32("nr", VirtConsole, port.id, VIRTIO_CONSOLE_BAD_ID),
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DEFINE_PROP_CHR("chardev", VirtConsole, chr),
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DEFINE_PROP_STRING("name", VirtConsole, port.name),
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DEFINE_PROP_END_OF_LIST(), |
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}, |
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}; |
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static void virtconsole_register(void) |
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{ |
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virtio_serial_port_qdev_register(&virtconsole_info); |
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} |
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device_init(virtconsole_register) |
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/* Generic Virtio Serial Ports */
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static int virtserialport_initfn(VirtIOSerialPort *port) |
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{ |
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VirtConsole *vcon = DO_UPCAST(VirtConsole, port, port); |
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if (port->id == 0) { |
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/*
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* Disallow a generic port at id 0, that's reserved for
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* console ports.
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*/
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error_report("Port number 0 on virtio-serial devices reserved for virtconsole devices for backward compatibility.");
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return -1; |
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} |
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return generic_port_init(vcon, port);
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} |
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static VirtIOSerialPortInfo virtserialport_info = {
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.qdev.name = "virtserialport",
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.qdev.size = sizeof(VirtConsole),
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.init = virtserialport_initfn, |
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.exit = virtconsole_exitfn, |
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.qdev.props = (Property[]) { |
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DEFINE_PROP_UINT32("nr", VirtConsole, port.id, VIRTIO_CONSOLE_BAD_ID),
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DEFINE_PROP_CHR("chardev", VirtConsole, chr),
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DEFINE_PROP_STRING("name", VirtConsole, port.name),
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DEFINE_PROP_END_OF_LIST(), |
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}, |
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}; |
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static void virtserialport_register(void) |
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{ |
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virtio_serial_port_qdev_register(&virtserialport_info); |
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} |
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device_init(virtserialport_register) |