extern void mga_driver_irq_preinstall( drm_device_t *dev );
extern void mga_driver_irq_postinstall( drm_device_t *dev );
extern void mga_driver_irq_uninstall( drm_device_t *dev );
+extern long mga_compat_ioctl(struct file *filp, unsigned int cmd,
+ unsigned long arg);
#define mga_flush_write_combine() DRM_WRITEMEMORYBARRIER()