winewayland.drv: Introduce infrastructure for driver kernel callbacks.

This mechanism allows the unixlib code of the driver to call back into
the PE code.

Signed-off-by: Alexandros Frantzis <alexandros.frantzis@collabora.com>

dlls/winewayland.drv/dllmain.c

@@ -20,6 +20,13 @@
 
 #include "waylanddrv_dll.h"
 
+typedef NTSTATUS (WINAPI *kernel_callback)(void *params, ULONG size);
+static const kernel_callback kernel_callbacks[] =
+{
+};
+
+C_ASSERT(NtUserDriverCallbackFirst + ARRAYSIZE(kernel_callbacks) == waylanddrv_client_func_last);
+
 static DWORD WINAPI wayland_read_events_thread(void *arg)
 {
     WAYLANDDRV_UNIX_CALL(read_events, NULL);
@@ -32,12 +39,17 @@ static DWORD WINAPI wayland_read_events_thread(void *arg)
 BOOL WINAPI DllMain(HINSTANCE instance, DWORD reason, void *reserved)
 {
     DWORD tid;
+    void **callback_table;
 
     if (reason != DLL_PROCESS_ATTACH) return TRUE;
 
     DisableThreadLibraryCalls(instance);
     if (__wine_init_unix_call()) return FALSE;
 
+    callback_table = NtCurrentTeb()->Peb->KernelCallbackTable;
+    memcpy(callback_table + NtUserDriverCallbackFirst, kernel_callbacks,
+           sizeof(kernel_callbacks));
+
     if (WAYLANDDRV_UNIX_CALL(init, NULL))
         return FALSE;
 

dlls/winewayland.drv/unixlib.h

@@ -19,8 +19,8 @@
 #ifndef __WINE_WAYLANDDRV_UNIXLIB_H
 #define __WINE_WAYLANDDRV_UNIXLIB_H
 
-#include <stdarg.h>
-#include "winternl.h"
+#include "windef.h"
+#include "ntuser.h"
 #include "wine/unixlib.h"
 
 enum waylanddrv_unix_func
@@ -30,4 +30,12 @@ enum waylanddrv_unix_func
     waylanddrv_unix_func_count,
 };
 
+/* driver client callbacks exposed with KernelCallbackTable interface */
+enum waylanddrv_client_func
+{
+    waylanddrv_client_func_last = NtUserDriverCallbackFirst
+};
+
+C_ASSERT(waylanddrv_client_func_last <= NtUserDriverCallbackLast + 1);
+
 #endif /* __WINE_WAYLANDDRV_UNIXLIB_H */

dlls/winewayland.drv/waylanddrv.h

@@ -48,6 +48,8 @@
 #include "unixlib.h"
 #include "wine/gdi_driver.h"
 
+#define WAYLANDDRV_CLIENT_CALL(func, params, size) waylanddrv_client_call(waylanddrv_client_func_ ## func, params, size)
+
 /**********************************************************************
  *          Globals
  */
@@ -794,6 +796,13 @@ static inline HWND get_focus(void)
     return NtUserGetGUIThreadInfo(GetCurrentThreadId(), &info) ? info.hwndFocus : 0;
 }
 
+/**********************************************************************
+ *          PE/unixlib support
+ */
+
+NTSTATUS waylanddrv_client_call(enum waylanddrv_client_func func, const void *params,
+                                ULONG size) DECLSPEC_HIDDEN;
+
 /**********************************************************************
  *          USER driver functions
  */

dlls/winewayland.drv/waylanddrv_main.c

@@ -230,3 +230,14 @@ const unixlib_entry_t __wine_unix_call_wow64_funcs[] =
 C_ASSERT(ARRAYSIZE(__wine_unix_call_wow64_funcs) == waylanddrv_unix_func_count);
 
 #endif /* _WIN64 */
+
+/***********************************************************************
+ *           waylanddrv_client_call
+ */
+NTSTATUS waylanddrv_client_call(enum waylanddrv_client_func func, const void *params,
+                                ULONG size)
+{
+    void *ret_ptr;
+    ULONG ret_len;
+    return KeUserModeCallback(func, params, size, &ret_ptr, &ret_len);
+}