1 files changed, 111 insertions, 0 deletions
diff --git a/hw/virtio-serial.c b/hw/virtio-serial.c
new file mode 100644
index 0000000..1dc031e
--- /dev/null
+++ b/hw/virtio-serial.c
@@ -0,0 +1,111 @@
+/*
+ * Virtio Console and Generic Serial Port Devices
+ *
+ * Copyright Red Hat, Inc. 2009
+ *
+ * Authors:
+ *  Amit Shah <amit.shah@redhat.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2.  See
+ * the COPYING file in the top-level directory.
+ */
+
+#include "qemu-char.h"
+#include "virtio-serial.h"
+
+typedef struct VirtConsole {
+    VirtIOSerialPort port;
+    CharDriverState *chr;
+} VirtConsole;
+
+
+/* Callback function that's called when the guest sends us data */
+static size_t flush_buf(VirtIOSerialPort *port, const uint8_t *buf, size_t len)
+{
+    VirtConsole *vcon = DO_UPCAST(VirtConsole, port, port);
+    ssize_t ret;
+
+    ret = qemu_chr_write(vcon->chr, buf, len);
+
+    return ret < 0 ? 0 : ret;
+}
+
+/* Readiness of the guest to accept data on a port */
+static int chr_can_read(void *opaque)
+{
+    VirtConsole *vcon = opaque;
+
+    return virtio_serial_guest_ready(&vcon->port);
+}
+
+/* Send data from a char device over to the guest */
+static void chr_read(void *opaque, const uint8_t *buf, int size)
+{
+    VirtConsole *vcon = opaque;
+
+    virtio_serial_write(&vcon->port, buf, size);
+}
+
+static void chr_event(void *opaque, int event)
+{
+    VirtConsole *vcon = opaque;
+
+    switch (event) {
+    case CHR_EVENT_OPENED: {
+        virtio_serial_open(&vcon->port);
+        break;
+    }
+    case CHR_EVENT_CLOSED:
+        virtio_serial_close(&vcon->port);
+        break;
+    }
+}
+
+/* Virtio Console Ports */
+static int virtconsole_initfn(VirtIOSerialDevice *dev)
+{
+    VirtIOSerialPort *port = DO_UPCAST(VirtIOSerialPort, dev, &dev->qdev);
+    VirtConsole *vcon = DO_UPCAST(VirtConsole, port, port);
+
+    port->info = dev->info;
+
+    port->is_console = true;
+
+    if (vcon->chr) {
+        qemu_chr_add_handlers(vcon->chr, chr_can_read, chr_read, chr_event,
+                              vcon);
+        port->info->have_data = flush_buf;
+    }
+    return 0;
+}
+
+static int virtconsole_exitfn(VirtIOSerialDevice *dev)
+{
+    VirtIOSerialPort *port = DO_UPCAST(VirtIOSerialPort, dev, &dev->qdev);
+    VirtConsole *vcon = DO_UPCAST(VirtConsole, port, port);
+
+    if (vcon->chr) {
+        port->info->have_data = NULL;
+        qemu_chr_close(vcon->chr);
+    }
+
+    return 0;
+}
+
+static VirtIOSerialPortInfo virtconsole_info = {
+    .qdev.name     = "virtconsole",
+    .qdev.size     = sizeof(VirtConsole),
+    .init          = virtconsole_initfn,
+    .exit          = virtconsole_exitfn,
+    .qdev.props = (Property[]) {
+        DEFINE_PROP_UINT8("is_console", VirtConsole, port.is_console, 1),
+        DEFINE_PROP_CHR("chardev", VirtConsole, chr),
+        DEFINE_PROP_END_OF_LIST(),
+    },
+};
+
+static void virtconsole_register(void)
+{
+    virtio_serial_port_qdev_register(&virtconsole_info);
+}
+device_init(virtconsole_register)