replace ad hoc driver loading with a proper driver manager, new DDK, new PnP manager with device matching, asynchronous startup, resource ownership and removal, add shared PCI capability helpers, replace typed, rigid services with a proper service manager, implement proper system shutdown and restart, shutting down unloads drivers and shuts down services, add simple power button, remove heavyweight boot self-tests and SMP stress runs, add monotonic timestamps to kernel debug output, fruitless USB and PS/2 fixes, make test builds opt in.

code/drivers/bus/usb/usb_bus.c

@@ -69,8 +69,8 @@ void* UsbAllocateDmaBuffer(USB_DEVICE* dev,
 
 // Frees a DMA buffer allocated for a USB class driver.
 void UsbFreeDmaBuffer(IO_DMA_BUFFER* buffer) {
-    if (buffer && gUsbDdk && gUsbDdk->Dma)
-        gUsbDdk->Dma->FreeCommonBuffer(buffer);
+    if (buffer)
+        IoDmaFreeCommonBuffer(buffer);
 }
 
 // Creates device.
@@ -275,9 +275,6 @@ KSTATUS UsbInitializeBusModel(void) {
     gUsbBusDriver.MajorFunction[IRP_MJ_PNP] = UsbDispatchPdoPnp;
     gUsbBusDriver.MajorFunction[IRP_MJ_INTERNAL_DEVICE_CONTROL] = UsbDispatchInternalDeviceControl;
 
-    KSTATUS st = IoRegisterDriverObject(&gUsbBusDriver);
-    if (!KSUCCESS(st)) return st;
-
     gUsbBusModelReady = true;
     return NTLSTATUS_SUCCESS;
 }
@@ -290,6 +287,7 @@ void UsbInitializeHcd(USB_HCD* hcd,
     if (!hcd) return;
     memset(hcd, 0, sizeof(*hcd));
     hcd->Operations = ops;
+    hcd->RootHubLock = (SPINLOCK)SPINLOCK_INIT;
     hcd->ControllerContext = controllerContext;
     hcd->DriverObject = &gUsbBusDriver;
     hcd->ControllerIndex = controllerIndex ? controllerIndex : ++gUsbNextControllerIndex;