[PATCH v4 2/5] ntoskrnl.exe: Add a stub PnP manager driver.

[Zebediah Figura]

Signed-off-by: Zebediah Figura 
---
 dlls/ntoskrnl.exe/ntoskrnl.c         |  5 ++++
 dlls/ntoskrnl.exe/ntoskrnl_private.h |  3 +++
 dlls/ntoskrnl.exe/pnp.c              | 36 ++++++++++++++++++++++++++++
 3 files changed, 44 insertions(+)

diff --git a/dlls/ntoskrnl.exe/ntoskrnl.c b/dlls/ntoskrnl.exe/ntoskrnl.c
index 6daa25e8055..65239c92558 100644
--- a/dlls/ntoskrnl.exe/ntoskrnl.c
+++ b/dlls/ntoskrnl.exe/ntoskrnl.c
@@ -850,6 +850,8 @@ NTSTATUS CDECL wine_ntoskrnl_main_loop( HANDLE stop_event )
     PsInitialSystemProcess = IoGetCurrentProcess();
     request_thread = GetCurrentThreadId();

+    pnp_manager_start();
+
     handles[0] = stop_event;
     handles[1] = manager;

@@ -917,6 +919,9 @@ NTSTATUS CDECL wine_ntoskrnl_main_loop( HANDLE stop_event )
     }

done:
+    /* Native PnP drivers expect that all of their devices will be removed when
+     * their unload routine is called, so we must stop the PnP manager first. */
+    pnp_manager_stop();
     wine_rb_destroy( &wine_drivers, unload_driver, NULL );
     return status;
 }
diff --git a/dlls/ntoskrnl.exe/ntoskrnl_private.h b/dlls/ntoskrnl.exe/ntoskrnl_private.h
index 2823a1cd4f1..1c5952f7c10 100644
--- a/dlls/ntoskrnl.exe/ntoskrnl_private.h
+++ b/dlls/ntoskrnl.exe/ntoskrnl_private.h
@@ -76,6 +76,9 @@ extern POBJECT_TYPE SeTokenObjectType;

void ObReferenceObject( void *obj ) DECLSPEC_HIDDEN;

+void pnp_manager_start(void) DECLSPEC_HIDDEN;
+void pnp_manager_stop(void) DECLSPEC_HIDDEN;
+
 static const WCHAR servicesW[] = {'\','R','e','g','i','s','t','r','y',
                                   '\','M','a','c','h','i','n','e',
                                   '\','S','y','s','t','e','m',
diff --git a/dlls/ntoskrnl.exe/pnp.c b/dlls/ntoskrnl.exe/pnp.c
index e1b348b82e3..6f2283bc834 100644
--- a/dlls/ntoskrnl.exe/pnp.c
+++ b/dlls/ntoskrnl.exe/pnp.c
@@ -3,6 +3,7 @@
  *
  * Copyright 2016 Sebastian Lackner
  * Copyright 2016 Aric Stewart for CodeWeavers
+ * Copyright 2019 Zebediah Figura
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
@@ -751,3 +752,38 @@ POWER_STATE WINAPI PoSetPowerState( DEVICE_OBJECT *device, POWER_STATE_TYPE type
     FIXME("device %p, type %u, state %u, stub!\n", device, type, state.DeviceState);
     return state;
 }
+
+static DRIVER_OBJECT *pnp_manager;
+
+static NTSTATUS WINAPI pnp_manager_device_pnp( DEVICE_OBJECT *device, IRP *irp )
+{
+    IO_STACK_LOCATION *stack = IoGetCurrentIrpStackLocation( irp );
+
+    TRACE("device %p, irp %p, minor function %#x.\n", device, irp, stack->MinorFunction);
+
+    IoCompleteRequest( irp, IO_NO_INCREMENT );
+    return irp->IoStatus.u.Status;
+}
+
+static NTSTATUS WINAPI pnp_manager_driver_entry( DRIVER_OBJECT *driver, UNICODE_STRING *keypath )
+{
+    pnp_manager = driver;
+    driver->MajorFunction[IRP_MJ_PNP] = pnp_manager_device_pnp;
+    return STATUS_SUCCESS;
+}
+
+void pnp_manager_start(void)
+{
+    static const WCHAR driver_nameW[] = {'\','D','r','i','v','e','r','\','P','n','p','M','a','n','a','g','e','r',0};
+    UNICODE_STRING driver_nameU;
+    NTSTATUS status;
+
+    RtlInitUnicodeString( &driver_nameU, driver_nameW );
+    if ((status = IoCreateDriver( &driver_nameU, pnp_manager_driver_entry )))
+        ERR("Failed to create PnP manager driver, status %#x.\n", status);
+}
+
+void pnp_manager_stop(void)
+{
+    IoDeleteDriver( pnp_manager );
+}