Flip virtio<->device relationship and begin upgrade

If multiple devices need its own virtio interface, it's cleaner for
each device to contain its own virtio than for a single virtio to manage
multiple devices.

Replaced original virtio v0.9 header in BAR0 with several virtio v1.0
PCI capabilities.

Began abstracting virtqueues.

lib/9p.js

@@ -51,14 +51,52 @@ var FID_XATTR = 2;
  * @constructor 
  *
  * @param {FS} filesystem
+ * @param {CPU} cpu
  */
-function Virtio9p(filesystem, bus) {
+function Virtio9p(filesystem, cpu, bus) {
     /** @type {FS} */
     this.fs = filesystem;
 
     /** @const @type {BusConnector} */
     this.bus = bus;
 
+    // new virtio interface:
+    this.virtIO = new VirtIO(cpu,
+    {
+        name: "virtio-9p",
+        pci_id: 0x06 << 3,
+        device_id: 0x1049,
+        subsystem_device_id: 9,
+        common:
+        {
+            initial_port: 0xA800,
+            queues:
+            [
+                {
+                    size: 32,
+                    notify_off: 0,
+                }
+            ],
+            features:
+            [
+            ],
+        },
+        notification:
+        {
+            initial_port: 0xA900,
+            share_handler: false,
+            handlers:
+            [
+                //on_notify.bind(this),
+            ],
+        },
+        isr_status:
+        {
+            initial_port: 0xA700,
+        },
+    });
+    // old virtio interface:
+
     this.SendReply = function(x, y) {};
     this.deviceid = 0x9; // 9p filesystem
     this.hostfeature = 0x1; // mountpoint

src/cpu.js

@@ -796,7 +796,7 @@ CPU.prototype.init = function(settings, device_bus)
 
         if(settings.fs9p)
         {
-            this.devices.virtio = new VirtIO(this, device_bus, settings.fs9p);
+            this.devices.virtio_9p = new Virtio9p(settings.fs9p, this, device_bus);
         }
     }