112 lines
2.7 KiB
C
112 lines
2.7 KiB
C
/*
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* Virtio Console and Generic Serial Port Devices
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*
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* Copyright Red Hat, Inc. 2009
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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 "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 size_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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ssize_t ret;
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ret = qemu_chr_write(vcon->chr, buf, len);
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return ret < 0 ? 0 : ret;
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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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}
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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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/* Virtio Console Ports */
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static int virtconsole_initfn(VirtIOSerialDevice *dev)
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{
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VirtIOSerialPort *port = DO_UPCAST(VirtIOSerialPort, dev, &dev->qdev);
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VirtConsole *vcon = DO_UPCAST(VirtConsole, port, port);
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port->info = dev->info;
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port->is_console = true;
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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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port->info->have_data = flush_buf;
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}
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return 0;
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}
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static int virtconsole_exitfn(VirtIOSerialDevice *dev)
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{
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VirtIOSerialPort *port = DO_UPCAST(VirtIOSerialPort, dev, &dev->qdev);
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VirtConsole *vcon = DO_UPCAST(VirtConsole, port, port);
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if (vcon->chr) {
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port->info->have_data = NULL;
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qemu_chr_close(vcon->chr);
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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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.init = virtconsole_initfn,
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.exit = virtconsole_exitfn,
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.qdev.props = (Property[]) {
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DEFINE_PROP_UINT8("is_console", VirtConsole, port.is_console, 1),
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DEFINE_PROP_CHR("chardev", VirtConsole, chr),
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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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